JP2020076183A - Belt reinforcing cloth - Google Patents

Abstract

To provide a belt reinforcing cloth having all of tensile strength, heat resistance, oil resistance, wear resistance and rubber adhesion and a belt including the same.SOLUTION: A belt reinforcing cloth for use in reinforcing a belt, has a fabric and an adhesion treatment agent attached thereto, the adhesion treatment agent containing a rubber latex, and the fabric containing, as the constituent fibers of the fabric, a meta-type aromatic polyamide fiber and a high-elastic-modulus organic fiber with an elastic modulus 300cN/dtex or more.SELECTED DRAWING: None

Description

  The present invention relates to a belt reinforcing cloth used for reinforcing a belt.

  The belt is generally configured by embedding a reinforcing layer inside the rubber layer and the resin layer in order to ensure strength. As the reinforcing layer, natural fibers such as cotton and hemp, polyamide, polyester, polyethylene, polyurethane, polystyrene, polyfluoroethylene, polyacryl, polyvinyl alcohol, wholly aromatic polyester, and aromatic polyamide (hereinafter Fabrics and cords made of twisted organic fibers such as aramid) are used.

  Among these, a belt in which a woven fabric using a high-strength para-type aromatic polyamide fiber is embedded as a reinforcing layer is used for applications requiring high tension, but the para-type aromatic polyamide fiber is used. Therefore, the abrasion resistance is poor, and the abrasion with the pulley makes contact with the pulley to shorten the life of the belt. On the other hand, a belt with a woven fabric made of nylon or polyester fibers has better abrasion resistance than a belt with a woven fabric made of para-type aromatic polyamide fibers, but the belt is not easy to install when the belt is installed. It is difficult to apply a high tension, and it is not suitable for applications requiring higher tension.

  As such improvement measures, for example, Patent Documents 1 and 2 disclose a technique in which a composite cord made of para-type aromatic polyamide fiber and nylon fiber is used for the warp and nylon fiber is used for the weft. In particular, by winding the surface of para-type aromatic polyamide fiber with nylon fiber to cover the surface of para-type aromatic polyamide fiber and protect it from abrasion and the like caused by contact with the pulley, aiming at improving durability. There is.

  However, under a high temperature and high load environment, or in an environment where it comes into contact with oil or water, the abrasion resistance of the nylon fiber decreases, and as a result, the abrasion of the entire fabric progresses. Also, in a high temperature environment, the mechanical properties of the fibers, adhesive resin, and rubber that make up the belt are reduced overall, and the adhesive strength is reduced, which may cause peeling between the woven fabric and the rubber. The problem remains that the reinforcement performance of the belt is reduced due to insufficient force.

Japanese Patent No. 3734103 Japanese Patent Laid-Open No. 2008-184312

  An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a belt reinforcing cloth having tensile strength, heat resistance, oil resistance, abrasion resistance and rubber adhesion.

  The present invention is a reinforcing cloth for a belt, comprising a woven fabric and an adhesive treatment agent attached to the woven fabric, which is used for reinforcing a belt, wherein the adhesive treatment agent contains rubber latex, and the woven fabric is a meta-type aromatic as a fiber constituting the woven fabric. A reinforcing fabric for a belt, comprising a polyamide fiber and a high elastic modulus organic fiber having an elastic modulus of 300 cN / dtex or more.

  ADVANTAGE OF THE INVENTION According to this invention, the reinforcement cloth for belts which has tensile strength, heat resistance, oil resistance, abrasion resistance, and rubber adhesive force can be provided.

  A first aspect of the present invention is a reinforcing fabric for a belt, comprising a woven fabric and an adhesive treatment agent attached to the woven fabric, which is used for reinforcing a belt, wherein the adhesive treatment agent contains rubber latex, and the woven fabric is a fiber constituting the woven fabric. A reinforcing fabric for a belt, characterized in that it contains a meta-type aromatic polyamide fiber and a high elastic modulus organic fiber having an elastic modulus of 300 cN / dtex or more.

  This first aspect is a preferred aspect in which the total content of the meta-type aromatic polyamide fiber and the high elastic modulus organic fiber having an elastic modulus of 300 cN / dtex or more in the fibers constituting the woven fabric is based on the total weight of the fibers constituting the woven fabric. It accounts for 50% by weight or more, and the content ratio of the meta-type aromatic polyamide fiber and the high elastic modulus organic fiber is 20:80 to 80:20 by weight.

  As a further preferred embodiment of this first embodiment, one of the warp and weft of the woven fabric contains meta-type aromatic polyamide fiber, and the other contains a high elastic modulus organic fiber having an elastic modulus of 300 cN / dtex or more. In a further preferred embodiment, the adhesive treatment agent is a condensate of chlorophenol, resorcin, and formalin and rubber latex, and the amount of the adhesive treatment agent attached to the weight of the woven fabric is 2 to 20% by weight.

  In a second aspect of the present invention, the adhesion treatment agent comprises a main treatment agent containing a condensate of resorcin and formalin and a rubber latex, and an acrylonitrile-butadiene rubber latex or a hydrogenated acrylonitrile-butadiene rubber latex and a crosslinking agent. The second treatment agent is the second treatment agent, which forms a layer in contact with the fibers of the woven fabric, and the second treatment agent is present by forming a layer outside the layer of the main treatment agent. is there.

  A third aspect of the present invention is that the adhesive treatment agent is a main treatment agent containing a condensate of resorcin and formalin and a rubber latex and a third treatment agent containing an epoxy compound, and the third treatment agent is a fabric The reinforcing fabric for a belt is formed by forming a layer in contact with the fiber and forming a layer outside the layer of the third treating agent as the main treating agent.

Hereinafter, the present invention will be described in detail.
[Meta-type aromatic polyamide fiber]
As the meta-type aromatic polyamide fiber, meta-phenylene isophthalamide fiber (commercially available product, "Conex" (trade name) manufactured by Teijin Limited, "Nomex" (trade name) manufactured by DuPont) can be preferably used. ..

  The form of the fibers can be, for example, long fibers, spun yarns, or stretch-cutting yarns. A spun yarn or a stretch-cutting yarn is preferable, and when used in this form, a large amount of fluff is intentionally generated on the surface to increase the surface area of the yarn surface and improve the adhesiveness. A particularly preferred form is a spun yarn that is easy to generate many fluffs on the surface.

  When forming a spun yarn or a stretch-cutting yarn, other fibers may be mixed with the meta-type aromatic polyamide fiber and used. When other fibers are mixed, from the viewpoint of maintaining the heat resistance, oil resistance, and abrasion resistance of the meta-type aromatic polyamide, the weight of the yarn is preferably at most 50% by weight, preferably at most 35% by weight. ..

  In the form of long fiber, stretch-cutting yarn, etc., they may be twisted in the form of single twist or ply twist, or in the form of spun yarn, additional twisted yarn may be added after the spinning process. Alternatively, it may be a single yarn or may be a form in which two or more single yarns are twisted together.

  In the spun yarn, the twist coefficient K is preferably in the range of 2.5 to 4.5 from the viewpoint of the physical properties of the cloth. However, T = K√n, T is the number of twists per inch (2.54 cm), n is an English cotton count, and K is a twist coefficient. The total fineness of the meta-type aromatic polyamide fiber used in the present invention is preferably 50 to 1200 dtex, more preferably 100 to 400 dtex.

  In the present invention, from the viewpoints of heat resistance, oil resistance, and abrasion resistance, it is preferable that both the warp and weft of the cloth constituting the woven fabric contain meta-type aromatic polyamide fiber.

[High modulus organic fiber]
In the present invention, the high elastic modulus organic fiber that constitutes the woven fabric together with the meta-type aromatic polyamide fiber is a high elastic modulus organic fiber having an elastic modulus of 300 cN / dtex or more. This elastic modulus is a value measured by the test method of ASTM D7269.

  Examples of the organic fiber include para-type aromatic polyamide fiber, polyparaphenylene benzoxazole fiber, and aromatic polyester fiber. Of these, para-type aromatic polyamide fibers are preferable, and among these, para-type aromatic homopolyamide fibers and para-type aromatic copolyamide fibers are preferable.

  In the case of para-type aromatic copolyamide fibers, the amount of copolymerization component in the fiber polymer is, for example, at most 20 mol%, preferably at most 10 mol%. The aromatic groups of the para-type aromatic copolyamide may be the same or different. The hydrogen atom of the aromatic group may be substituted with a halogen atom, a lower alkyl group or a phenyl group.

  Specifically, polyparaphenylene terephthalamide fibers (for example, "Twaron" manufactured by Teijin Aramid BV) and copolyparaphenylene-3,4'-oxydiphenylene- which is a copolymer type aromatic polyamide fiber. An example is terephthalamide fiber (for example, "Technora" manufactured by Teijin Limited). In particular, copolyparaphenylene.3,4'-oxydiphenylene.terephthalamide fiber (for example, "Technora" manufactured by Teijin Limited), which is a copolymerized aromatic polyamide fiber, is preferable because it has excellent abrasion resistance.

  The para-type aromatic polyamide fiber can be used in the form of long fiber, spun yarn, stretch-cutting yarn, or the like, like the above-mentioned meta-type aromatic polyamide fiber. Preferred is the form of spun yarn or stretch-cutting yarn, and by using this form, a large amount of fluff can be intentionally generated on the surface, the surface area of the yarn surface is increased, and the adhesiveness is improved. You can From the viewpoint of achieving both surface fluff and mechanical properties, a stretch-cutting yarn is particularly preferable.

  When forming a spun yarn or a stretch cut yarn, a high elastic modulus organic fiber having an elastic modulus of 300 cN / dtex or more may be mixed with other fibers and used. When other fibers are mixed, from the viewpoint of maintaining the elastic modulus characteristics of the high elastic modulus fiber, it is preferable that the amount is at most 50% by weight, preferably at most 35% by weight of the yarn weight.

In any form of long fiber, spun yarn, and stretch-cutting yarn, they may be twisted. In the spun yarn, the twist coefficient K is preferably in the range of 2.5 to 4.5 from the viewpoint of the physical properties of the cloth. However, T = K√n, T is the number of twists per inch (2.54 cm), n is an English cotton count, and K is a twist coefficient. In the case of twisting with long fibers or stretch-cutting yarn, it is preferable to twist with a twist coefficient (TM) of the following formula of 1.0 to 5.0. More preferably, it is 1.0 to 3.0.
TM = T × √D / 1055
(However, TM represents the twist coefficient, T represents the number of twists (times / m), and D represents the total fineness (tex).)
The total fineness of the high elastic modulus organic fibers used in the present invention is preferably 100 to 600 dtex fibers, more preferably 200 to 500 dtex fibers.

[Composite code]
At least one of the meta-type aromatic polyamide fibers of the warp and weft of the woven fabric is preferably a composite cord of a meta-aromatic polyamide fiber and a high elastic modulus organic fiber having an elastic modulus of 300 cN / dtex or more. Both the warp and the weft may be this composite cord.

  This composite cord is obtained by subjecting a meta-aromatic polyamide fiber and a high-modulus organic fiber to undertwisting by a known method using a ring twisting machine or the like, aligning both yarns, and in the opposite direction. (For example, if the lower twist is in the Z direction, the upper twist is applied in the same known manner as above), the method of blending in the fiber mixing or spinning process, the method of interlacing with a fluid jet, the covering machine, etc. It can be manufactured by a winding method.

  A more preferable embodiment of the composite cord is a meta-aromatic polyamide fiber, which is formed by winding (covering) the outer periphery of a high elastic modulus organic fiber having an elastic modulus of 300 cN / dtex or more, and a core having an elastic modulus of 300 cN / dtex or more. This is a core-sheath structure in which high elastic modulus organic fibers are arranged and meta-aromatic polyamide fibers are arranged in the sheath portion.

  A particularly preferred embodiment of the composite cord is a composite cord obtained by covering the spun yarn or the stretch-cutting yarn of the para-type aromatic polyamide fiber with the spun yarn or the stretch-cutting yarn of the meta-type aromatic polyamide fiber. With such a composite cord, the wear resistance of the reinforcing cloth can be improved by apparently covering the high elastic modulus organic fiber of the core with the meta-aromatic polyamide fiber having excellent wear resistance.

The covering number of the meta-aromatic polyamide fiber is a covering coefficient (CF) expressed by the following formula, and is preferably 0.5 to 10.0, more preferably 1.0 to 5.0 in the S direction or the Z direction. ..
CF = T × √D / 1055
(However, CF represents the covering coefficient, T represents the covering number (times / m), and D represents the fineness (tex) of the meta-type aromatic polyamide fiber.)

  The covering may be performed with one meta type aromatic polyamide fiber or with a plurality of meta type aromatic polyamide fibers. The ratio of the total fineness of the meta-type aromatic polyamide fiber used for the composite cord and the high elastic modulus organic fiber is preferably 20:80 to 80:20. When the ratio is within this range, a cord having preferable tensile strength, heat resistance, oil resistance, and wear resistance can be obtained.

  In addition to the meta-type aromatic polyamide fiber and the high elastic modulus organic fiber, the composite cord is a composite cord with a fiber having a high elongation at break of 30% or more such as polyurethane fiber or polytrimethylene terephthalate fiber having excellent elasticity. By this, extensibility under a low load can be imparted, and the subsequent moldability with the belt is improved, which is preferable.

  When combined with a high elongation fiber, a high elastic modulus organic fiber is covered on the outer periphery of the high elongation fiber, and a meta-type aromatic polyamide fiber is further covered on the outer periphery thereof, or on the outer periphery of the high elongation fiber. Alternatively, a method of covering a high elastic modulus organic fiber covered with a meta-type aromatic polyamide fiber can be used.

[fabric]
The woven fabric includes meta-type aromatic polyamide fibers as fibers constituting the woven fabric and high elastic modulus organic fibers having an elastic modulus of 300 cN / dtex or more.

  The total content of both is preferably 50% by weight or more, more preferably 70% by weight or more, based on the total weight of the fibers constituting the woven fabric. If the total content of both is less than 50% by weight, a reinforcing cloth having inferior strength, heat resistance, oil resistance and abrasion resistance is obtained, which is not preferable.

  The content ratio of the meta-type aromatic polyamide fiber and the high elastic modulus organic fiber in the fibers constituting the woven fabric is preferably 20:80 to 80:20, and more preferably 40:60 to 70:30 by weight. When the ratio is within this range, a reinforcing cloth having favorable tensile properties, heat resistance, oil resistance and abrasion resistance can be obtained.

The fabric according to the present invention includes the following aspects.
(Ii) A mode in which the warp of the woven fabric contains meta-type aromatic polyamide fiber, and the weft contains high-modulus organic fiber having a modulus of elasticity of 300 cN / dtex or more.
(Ro) A mode in which the weft of the woven fabric contains meta-type aromatic polyamide fibers, and the warp contains high elastic modulus organic fibers having an elastic modulus of 300 cN / dtex or more.
(A) A mode in which the warp and the weft of the woven fabric include meta-type aromatic polyamide fiber, and the warp and the weft include a high elastic modulus organic fiber having an elastic modulus of 300 cN / dtex or more.
(I) A mode in which the warp and weft of the woven fabric include meta-type aromatic polyamide fiber, and the warp or weft includes a high elastic modulus organic fiber having an elastic modulus of 300 cN / dtex or more.
(H) A mode in which the warp or weft of the woven fabric includes a composite cord of a meta-type aromatic polyamide fiber and a high elastic modulus organic fiber having an elastic modulus of 300 cN / dtex or more.
(H) A mode in which the warp and weft of the woven fabric include a composite cord of a meta-type aromatic polyamide fiber and a high elastic modulus organic fiber having an elastic modulus of 300 cN / dtex or more.
(And) One of the warp and weft of the woven fabric is a meta-type aromatic polyamide fiber, and the other is a high elastic modulus organic fiber having an elastic modulus of 300 cN / dtex or more.

  From the viewpoint of obtaining good strength, heat resistance, abrasion resistance and adhesiveness, one of the warp and weft of the woven fabric contains meta-type aromatic polyamide fiber, and the other has a high elastic modulus of 300 cN / dtex or more. It is preferable to include fibers.

  The weave of the woven fabric may be, for example, a plain weave, a straight woven weave (a weave in which a warp yarn and a weft yarn are arranged in a straight line and entwined with a kalami yarn), a suede weave, and a twill weave.

  One reinforcing cloth having an adhesive treatment agent adhered to the above woven fabric or, if necessary, about 2 to 6 sheets is laminated to be used as a reinforcing cloth for a belt. When laminating a plurality of reinforcing cloths, reinforcing cloths made of the same material may be laminated or different reinforcing cloths may be laminated.

[Easy adhesion treatment]
The belt reinforcing fabric of the present invention is obtained by subjecting the above-mentioned woven fabric to an easy adhesion treatment with an adhesive treatment agent containing rubber latex.

  In the first aspect of the present invention, the adhesion treatment agent comprises a rubber latex, and in a preferred aspect, the adhesion treatment agent comprises a condensate of chlorophenol, resorcin, formalin and a rubber latex. In this case, the adhesion amount of the adhesive treatment agent to the weight of the woven fabric is 2 to 20% by weight, preferably 3 to 15% by weight. If it is less than 2% by weight, the adhesive treatment agent is insufficient and good adhesion cannot be obtained, and if it exceeds 20% by weight, the thickness of the adhesive treatment layer increases, and the adhesion decreases due to cohesive failure of the adhesive treatment layer.

  In the second aspect of the present invention, the adhesion treatment agent contains a main treatment agent containing a condensate of resorcin and formalin and a rubber latex, and an acrylonitrile-butadiene rubber latex or a hydrogenated acrylonitrile-butadiene rubber latex and a crosslinking agent. The second treatment agent is a main treatment agent that forms a layer in contact with the fibers of the woven fabric, and the second treatment agent exists as a layer outside the layer of the main treatment agent.

  In a third aspect of the present invention, the adhesive treatment agent is a main treatment agent containing a condensate of resorcin and formalin and a rubber latex and a third treatment agent containing an epoxy compound, and the third treatment agent is a woven fabric. Forming a layer in contact with the fibers, and the main treating agent is present in a layer outside the third treating agent layer.

Hereinafter, the "bonding treatment agent", "second treatment agent" and "third treatment agent" will be described.
[Adhesive treatment agent (main treatment agent)]
The adhesion treatment agent in the first aspect and the main treatment agents in the second and third aspects will be described. The main treatment agent in the second and third aspects is the same as the adhesive treatment agent in the first aspect.

  The adhesive treatment agent may include rubber latex, and preferably, rubber latex is used in combination with resorcin / formalin resin, phenol / aldehyde resin, isocyanate, maleimide-modified polybutadiene, or urethane-modified polybutadiene. From the viewpoint of maintaining adhesiveness in a high temperature environment, a preferred embodiment of the adhesive treatment agent is resorcin-formalin-rubber latex (RFL), which is a condensate of resorcin-formalin and rubber latex.

  A particularly preferred embodiment of the adhesive treatment agent in the first aspect of the present invention is one containing a condensate of chlorophenol, resorcin and formalin as a part of the condensate of resorcin and formalin.

  As the resorcin, a pre-oligomerized resorcin-formalin initial condensate or a polynuclear chlorophenol-based resorcin-formalin initial condensate obtained by oligomerizing chlorophenol and resorcin with formalin may be used alone or in combination thereof.

  In general, the surface of the meta-type aromatic polyamide fiber has insufficient activity and it is difficult to obtain sufficient adhesive force, but when a condensate of chlorophenol, resorcin and formalin is used, The adhesive strength can be increased.

  The mechanism is not clear, but it is presumed that the chlorophenol structure and the meta-type aromatic polyamide fiber have high affinity. As a method of preparing an adhesive treatment agent containing chlorophenol, resorcin, formalin and rubber latex, after mixing resorcin, formalin and latex and aging for a certain period of time to prepare a resorcin / formalin / latex aqueous adhesive, chlorophenol is mixed. A method in which an aqueous adhesive solution containing a condensate of phenol, resorcin and formalin is added and prepared is preferable.

  As the resorcin / formalin / latex aqueous adhesive to be prepared in advance, one having a resorcin / formaldehyde molar ratio in the range of 1: 0.6 to 1: 8 is preferable, and in the range of 1: 0.8 to 1: 6. Some are more preferred. When the amount of formaldehyde is less than this range, the crosslink density of the condensate of resorcin-formalin is lowered and the molecular weight is lowered, so that the cohesive force of the resin layer is lowered and the adhesiveness may be lowered, which is not preferable. On the other hand, if the amount of formaldehyde is larger than this range, the resorcinol / formalin condensate will become harder due to the increase in crosslink density, and compatibilization between the resorcinol / formalin / latex adhesive and rubber will be hindered during covulcanization with the adherend rubber. And the adhesiveness tends to decrease, which is not preferable.

  The compounding ratio of resorcin / formalin / rubber latex in the resorcin / formalin / latex resin is preferably in the range of 1: 3 to 1:16, more preferably 1: 4 to 1:12, and particularly preferably as a solid content weight ratio. Is from 1: 4 to 1:10. If the ratio of the rubber latex is less than this range, the adhesive force tends to decrease because the co-vulcanization component with rubber is small, while if the ratio of the rubber latex is more than this range, sufficient strength as an adhesive film is obtained. As a result, the adhesive strength and durability tend to decrease, and the adhesively treated woven fabric may have a significantly high tackiness, resulting in a decrease in process passability such as handleability in the adhesive treatment process.

  When the chlorophenol / resorcin / formalin condensate is mixed, the mixing ratio of the resorcin / formalin condensate and the chlorophenol / resorcin / formalin condensate is preferably 1: 3 to 1: 6 in terms of solid content. When used in this range, particularly good adhesiveness and durability of adhesiveness can be obtained.

  Examples of the rubber latex include hydrogenated acrylonitrile-butadiene rubber latex, acrylonitrile-butadiene rubber latex, isoprene rubber latex, urethane rubber latex, styrene-butadiene rubber latex, vinylpyridine-styrene-butadiene rubber latex, chloroprene rubber latex, butadiene rubber. Latex, chlorosulfonated polyethylene latex can be exemplified, from the viewpoint of obtaining high heat resistance and oil resistance, preferably acrylonitrile-butadiene rubber latex, hydrogenated acrylonitrile-butadiene rubber latex, particularly preferably hydrogenated acrylonitrile-butadiene rubber latex. To use.

  The acrylonitrile-butadiene rubber latex and hydrogenated acrylonitrile-butadiene rubber latex may be modified such as carboxyl modified.

  A cross-linking agent may be used in combination with resorcin / formalin / latex. Examples of the cross-linking agent include amine, ethylene urea, carbodiimide, bismaleimide, and blocked isocyanate compound. Of these, blocked isocyanate compounds are preferable because the stability of the treating agent over time is better. Examples of this blocked isocyanate compound include blocked isocyanates of dimethylpyrazole block, methyl ethyl ketone oxime block, and caprolactam block. You may use these in combination of 2 or more types.

  The amount of the crosslinking agent added is, for example, 0.5 to 40% by weight, preferably 10 to 30% by weight, based on the total weight of the adhesive treatment agent containing the condensate of chlorophenol, resorcin, formalin and rubber latex. If the amount added is increased, the adhesive strength will usually improve, but if the amount added is too large, the compatibility of the adhesive with rubber will decrease, and the adhesive strength with rubber tends to decrease, so use within this range. Is preferred.

[Second treatment agent]
The belt reinforcing cloth of the present invention is subjected to an easy-adhesion treatment with a main treatment agent to form a layer of the main treatment agent which is in contact with the fibers of the woven fabric, and then a second treatment agent is applied to the surface to form a main treatment agent. It is preferable to form a second treatment agent layer on the outside of the treatment agent layer. This aspect corresponds to the second aspect of the present invention.

  The amount of the main treatment agent attached to the woven fabric is preferably 3 to 17% by weight. If it is less than 3% by weight, it is difficult to obtain a sufficiently high adhesive force, which is not preferable. On the other hand, if it exceeds 17% by weight, stress concentration tends to occur in the layer of the main treatment agent and cohesive failure tends to occur, so that the adhesive force may decrease. It is highly unfavorable. From the viewpoint of maintaining the peeling adhesive strength of the reinforcing cloth, the total amount of the main treatment agent and the second treatment agent is 13% by weight or more, preferably 15 to 40% by weight, and more preferably 20 to 40% by weight. % So that it adheres.

  The amount of the second treatment agent attached to the weight of the fabric is, for example, 3 to 37% by weight, preferably 3 to 15% by weight. If it is less than 3% by weight, the adhesive treatment agent is insufficient and good adhesion cannot be obtained, and if it exceeds 37% by weight, the thickness of the adhesive treatment layer increases and the adhesion decreases due to cohesive failure of the adhesive treatment layer.

  The second treatment agent is an adhesive treatment agent containing acrylonitrile-butadiene rubber latex and / or hydrogenated acrylonitrile-butadiene rubber latex and a crosslinking agent as constituent components.

  The second treating agent preferably contains carbon black and zinc oxide in addition to the acrylonitrile-butadiene rubber latex and / or hydrogenated acrylonitrile-butadiene rubber latex and the crosslinking agent. Acrylonitrile-butadiene rubber latex and / or hydrogenated acrylonitrile-butadiene rubber latex, which have a high affinity with the rubber component, and a crosslinker component with a high cohesive force are mixed, and their molecular chains are entangled with each other, resulting in adhesion and cohesiveness. It forms a high-quality cord coating.

  Further, the addition of carbon black or zinc oxide can further increase the affinity with the rubber component. It preferably contains hydrogenated acrylonitrile-butadiene rubber latex, a cross-linking agent, carbon black and zinc oxide.

  This second treating agent may be dissolved in an organic solvent and used as a rubber paste, but it is preferable to adhere the second treating agent to the surface of the woven fabric with a dispersion liquid dispersed in water from the viewpoint of handleability and environment.

  Examples of the cross-linking agent include amine, ethylene urea, maleimide, blocked polyisocyanate compound, and the like, and the blocked polyisocyanate compound is preferable from the viewpoint of the temporal stability of the treatment agent and the interaction with the pretreatment agent.

  The blocked polyisocyanate compound is preferably selected from aromatic diphenylmethane diisocyanate, toluene diisocyanate, aliphatic hexamethylene diisocyanate and the like. Preferably, it is recommended to use aromatic diphenylmethane diisocyanate, which has excellent crosslinking performance. More specifically, as the blocked isocyanate, a blocked isocyanate of dimethylpyrazole block, methyl ethyl ketone oxime block, or caprolactam block is preferable, and more specifically, caprolactam block diphenylmethane diisocyanate is preferably used.

  The second treatment agent is chlorinated natural rubber, polychloroprene, chlorinated polychloroprene, chlorinated polybutadiene, hexachloropentadiene, butadiene / halogenated cyclic conjugated diene adduct, chlorinated butadiene styrene copolymer, chlorinated ethylene propylene copolymer. Polymer and ethylene / propylene / non-conjugated diene terpolymer, chlorinated polyethylene, chlorosulfonated polyethylene, poly (2,3-dichloro-1,3-butadiene), brominated poly (2,3-dichloro-) 1,3-Butadiene), a copolymer of α-haloacrylonitrile and 2,3-dichloro-1,3-butadiene, chlorine-containing polymers such as chlorinated poly (vinyl chloride) and halogen-containing polymers such as bromine. Is more preferable. These halogen-containing polymers are entangled with the nitrile rubber latex and / or hydrogenated nitrile rubber latex and diffuse into the rubber of the adherend to improve the rigidity and cohesive force of the rubber matrix and reduce the difference in rigidity from the woven fabric. By doing so, the woven fabric and the rubber matrix are more integrated and the adhesive force is improved.

  When carbon black is added to the second treatment agent, the addition amount thereof is, for example, 0.5 to 10% by weight, preferably 1 to 5% by weight, based on the weight of the second treatment agent, and the content of zinc oxide is The amount is, for example, 1 to 20% by weight, preferably 5 to 15% by weight, based on the weight of the second treatment agent.

  The second treating agent is, for example, a rubber paste obtained by dissolving rubber in an organic solvent, a solvent-based adhesive of chlorosulfonated polyethylene or a halogen-containing polymer or a water-based adhesive, and acrylonitrile-butadiene rubber latex and / or hydrogenated acrylonitrile- A butadiene rubber latex can also be mixed and prepared. These solvent-based adhesives and water-based adhesives are commercially available, and for example, "Metaloc F112" manufactured by Toyo Kagaku Kenkyusho Co., Ltd., "CHEMLOK CH233X", "CHEMLOCH CH238S", "CHEMLOK CH8216" manufactured by LORD Co., Ltd. should be used. You can

  In terms of handleability, “CHEMLOK CH8216” which is an aqueous adhesive and contains chlorine-containing resin, carbon black and zinc oxide can be preferably used. By using a mixture of this with acrylonitrile-butadiene rubber latex and / or hydrogenated acrylonitrile-butadiene rubber latex, it is possible to realize a manufacturing process with a low environmental load without using any organic solvent in the manufacturing process. You can

  These adhesives diffuse and interact in the rubber of the adherend, improve the rigidity and cohesive force of the rubber matrix, and reduce the difference in rigidity with the woven fabric, thereby integrating the woven fabric and the rubber matrix. And improve the adhesive strength.

[Third treatment agent]
The reinforcing cloth for a belt of the present invention, prior to the easy-adhesion treatment with the main treatment agent, surface-treats the fibers of the woven fabric with the third treatment agent in advance to form a layer of the third treatment agent in contact with the fibers of the woven fabric. Then, after that, it is preferable to form the layer of the main treatment agent on the outside of the layer of the third treatment agent by the treatment for facilitating adhesion with the main treatment agent. This aspect corresponds to the third aspect of the present invention.

  An epoxy compound is used as the third treatment agent. By treating with an epoxy compound, the affinity with the main treating agent can be increased.

  In this case, the amount of the main treatment agent attached is preferably 3 to 17% by weight based on the weight of the woven fabric. If it is less than 3% by weight, it is difficult to obtain a sufficiently high adhesive force, which is not preferable. On the other hand, if it exceeds 17% by weight, stress concentrates on the layer of the main treatment agent and cohesive failure is likely to occur, resulting in a decrease in adhesive force. Possibly high and not preferable.

  The amount of the third treatment agent attached to the woven fabric is preferably 0.05 to 5% by weight, more preferably 0.2 to 2% by weight, based on the weight of the woven fabric. If the adhesion amount is less than this, the layer of the epoxy resin of the third treatment agent formed on the surface of the fiber of the woven fabric is not sufficient, and it is not difficult to obtain adhesion with the layer of the main treatment agent, which is not preferable. On the other hand, if the adhered amount is larger than this, the epoxy resin strongly bundles the single fibers constituting the fibers, resulting in poor wear resistance, which is not preferable.

  Specific examples of the epoxy compound used as the third treating agent include reaction products of polyhydric alcohols such as ethylene glycol, glycerol, sorbitol, pentaerythritol, and polyethylene glycol with halogen-containing epoxides such as epichlorohydrin, resorcin, piscine. Obtained by oxidizing an unsaturated compound with a reaction product of a polyhydric phenol such as (4-hydroxyphenyl) dimethylmethane, phenol / formaldehyde resin, resorcin / formaldehyde resin and the halogen-containing epoxide, peracetic acid or hydrogen peroxide. Examples of the polyepoxide compounds that can be used include 3,4-epoxycyclohexene epoxide, 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexenecarboxylate, and bis (3,4-epoxy-6-methyl-cyclohexylmethyl) adipate. it can. Of these, reaction products of polyhydric alcohols and epichlorohydrin are preferable, and polyepoxide compounds such as polyglycidyl ether compounds of polyhydric alcohols and compounds produced by a curing agent are also preferable.

  When a polyepoxide compound is used, an emulsifying agent such as sodium alkylbenzene sulfonate or dioctyl sulfosuccinate sodium salt may be used to prepare an emulsion. A polyepoxide compound is used in combination with an amine-based or imidazole-based curing agent, a blocked polyisocyanate that is an addition compound of a polyisocyanate and a blocking agent such as oxime, phenol, or caprolactam, and ethylene urea that is a reaction compound with ethyleneimine. You may.

  When a polyepoxy compound is used, when the weight of the polyepoxide compound is A parts by weight and the weight of the curing agent, blocked polyisocyanate and ethylene urea is B parts by weight, the relationship between the two is 0.05 ≦ (A) / It is preferable that the condition of [(A) + (B)] ≦ 0.9 is satisfied. Within this range, particularly good adhesiveness can be obtained.

  The treatment with the epoxy compound may be performed on the woven fabric, or may be performed by weaving the woven fabric using the meta-type aromatic polyamide fiber or the high elastic modulus organic fiber previously treated with the epoxy compound.

[Rubber used together with rubber belt]
The belt reinforcing cloth of the present invention is used for the purpose of reinforcing a rubber belt, but in this scene, as the rubber used together, acrylic rubber, acrylonitrile-butadiene rubber, hydrogenated acrylonitrile-butadiene rubber, isoprene rubber, urethane rubber, Examples thereof include ethylene-propylene rubber, ethylene-propylene-diene rubber (EPDM), chloroprene rubber, silicone rubber, styrene-butadiene rubber, polysulfide rubber, natural rubber, butadiene rubber, and fluororubber. In particular, acrylonitrile-butadiene rubber and hydrogenated acrylonitrile-butadiene (H-NBR) rubber, which have excellent durability in a high temperature environment or an environment in oil, are preferable.

  These rubbers contain various vulcanizing agents and vulcanization accelerators in addition to the main component rubber, and also inorganic fillers such as carbon black and silica, coumarone resin, phenol resin, etc. for modifying materials. Various additives such as organic fillers and softeners such as naphthenic oils may be included.

  Such a rubber material can be molded by aligning a required number of the rubber-reinforcing composite cords of the present invention, sandwiching them with rubber, and further pressurizing and heating with the above vulcanizer or the like.

〔Production method〕
The reinforcing cloth for a belt of the present invention can be manufactured by weaving a woven fabric and then applying an adhesive treatment agent thereto. When different yarns are used for the warp yarn and the weft yarn, from the viewpoint of weavability, it is preferable to use a yarn having a relatively low elastic modulus among the warp yarn and the weft yarn.

  The adhesion treatment agent can be attached by the following "treatment with an adhesion treatment agent (main treatment agent)", "treatment with a second treatment agent", and "treatment with a third treatment agent".

  In the first aspect of the present invention, "treatment with an adhesion treatment agent (main treatment agent)" is performed, and in the second aspect, "treatment with an adhesion treatment agent (main treatment agent)" and "treatment with a second treatment agent". Are performed in this order, and in the third embodiment, "treatment with a third treatment agent" and "treatment with an adhesive treatment agent (main treatment agent)" are performed in this order.

[Treatment with adhesive treatment agent (main treatment agent)]
As a method of adhering the adhesive treatment agent to the fabric, a method of bringing the dispersion liquid or solution of the adhesive treatment agent into contact with the fabric by a roller, a method of spraying and applying the dispersion liquid or solution to the fabric from a nozzle, and a fabric to the dispersion liquid or solution The method of immersing can be used, for example.

  In order to suppress the adhesion amount of the adhesive treatment agent, it is possible to use means such as squeezing with a pressing roller, scraping with a scrubber, blowing with air blowing, suction, and beater. On the other hand, in the case of increasing the adhesion amount, it is possible to use, for example, a means for increasing the concentration of the adhesive treatment agent in the dispersion liquid or the solution, increasing the number of contacts or time, increasing the spray amount, and increasing the immersion time.

  After the adhesion treatment agent is brought into contact with the fabric by a method such as dipping or coated fabric, the adhesion treatment agent is adhered to the fabric by performing drying and heat treatment at a temperature of 100 ° C. to 250 ° C. for 60 to 300 seconds, for example. be able to. Preferred conditions at this time are drying for 60 to 240 seconds at a temperature of 100 to 180 ° C., and then heat treatment for 60 to 240 seconds at a temperature of 200 to 245 ° C.

  If the temperature of drying and heat treatment is lower than the above range, the adhesion between the resulting belt reinforcing cloth and the rubber used in the rubber reinforcement tends to be insufficient. On the other hand, when the temperature of drying and heat treatment is higher than the above range, the adhesive treatment agent is air-oxidized at a high temperature, and the adhesive activity between the obtained reinforcing cloth and the rubber used in the rubber-reinforced scene tends to decrease.

[Treatment with second treatment agent]
After the adhesion of the main treatment agent, the woven fabric is dipped in a solution or dispersion of the second treatment agent, and dried and heat-treated at a temperature of 80 to 180 ° C. for, for example, 60 to 300 seconds. If this drying / heat treatment temperature is too low, the drying tends to be inadequate and the process passability tends to deteriorate.On the other hand, if the drying / heat treatment temperature is too high, the adhesive component is deactivated at high temperature and the adhesive activity decreases. There is a tendency to fall.

  As the number of times of dipping and heat treatment increases, the warp and weft of the woven fabric are more likely to be misaligned, and as a result, the physical properties of the reinforcing fabric are likely to deteriorate. When the deterioration of the reinforcing cloth is considered to be the rate-determining factor of the destruction when the belt is tested for durability, it is preferable to reduce the number of times the adhesive treatment is soaked as much as possible to enhance the mechanical properties of the reinforcing cloth. When the peeling is considered to be the rate-determining factor for destruction, it is preferable to increase the adhesive strength of the reinforcing cloth even if the number of times of immersion of the adhesive treatment agent is increased.

[Treatment with third treatment agent]
As a method of surface-treating with the epoxy compound of the third treatment agent, for example, a method of attaching a dispersion liquid or solution of the epoxy compound in the spinning step of the constituent fibers of the woven fabric, an epoxy compound in a step different from the spinning step after spinning The method of attaching the emulsifier to the fiber or the method of attaching it to the fabric can be used. In these cases, heat treatment is preferably performed at a temperature of 100 to 250 ° C. for 10 to 120 seconds after the adhesion.

  When attached in the spinning process, it is preferable to attach the epoxy compound mixed with the oil agent to the fiber single yarn, and when attached in a process different from the yarn production process, it is preferable to attach the epoxy compound emulsifier to the fiber single yarn. ..

  For example, when a surface treatment is performed using a polyepoxide compound as an epoxy compound, an emulsion containing a polyepoxide compound and a curing agent, blocked polyisocyanate or ethylene urea is mixed with an oil agent to adhere to the fiber, and the emulsifier is added to the fiber. It is advisable to attach the monofilament to the single yarn and heat-treat at a temperature of 100 to 250 ° C. for 10 to 240 seconds after attaching the emulsifier.

[Rubber belt manufacturing method]
A rubber belt using the reinforcing cloth for a belt of the present invention can be produced by using the reinforcing cloth for a belt of the present invention as a reinforcing cloth in the same manner as a conventional cloth reinforcing belt. For example, it can be manufactured by a method in which unvulcanized rubber and a reinforcing cloth are superposed and then pressure-heated to perform vulcanization adhesion integration.

  The direction in which the reinforcing cloth is superposed on the unvulcanized rubber is preferably adjusted so that the yarn having a relatively high elastic modulus is oriented in the longitudinal direction of the belt. Due to the moldability at the time of belt molding, the reinforcing cloths may be slanted and overlapped in order to give some stretchability.

  The direction in which the reinforcing cloth is superposed on the unvulcanized rubber is preferably adjusted so that the high elastic modulus organic fibers are oriented in the longitudinal direction of the belt. Due to the moldability at the time of belt molding, the reinforcing cloths may be slanted and overlapped in order to give some stretchability.

  The present invention includes a toothed belt using the above-mentioned belt reinforcing cloth as a reinforcing cloth, and using a hydrogenated acrylonitrile-butadiene rubber as a tooth rubber, the toothed belt being used in an in-oil environment.

Hereinafter, the present invention will be described with reference to examples. The evaluations in the examples of the present invention were carried out by the following measuring methods.
(1) Fineness and strength of warp and weft The fineness and strength of the warp and weft before weaving and adhesion treatment were measured by measuring according to JIS L1017.
(2) Warp density and weft density of the reinforcing cloth The warp density and the weft density were measured according to JIS L1096.
(3) Strength of reinforcing cloth in warp direction and weft direction The tensile strength in the warp direction and the weft direction was measured according to JIS L1096. However, the width of the fabric was 25.4 mm and the length was 200 mm.
(4) Warp strength and weft strength of the reinforcing cloth after immersion in high temperature oil The reinforcing cloth was immersed in standard oil prescribed by ASTM D471 (IRM902 manufactured by Nippon San Oil Co., Ltd.) at 130 ° C. for 1000 hours, then taken out, and the oil was wiped off. Then, the tensile strength was measured in the same manner as in (3) above.
(5) Tensile strength in the warp direction and the weft direction of the reinforcing cloth after the abrasion test after immersion in high temperature oil After the above (4), according to JIS L 1096 E method (Martindale method), with a specified weight, In a test in which a circular test piece was rubbed with a standard wear cloth, after 5,000 times wear, the tensile strength in the warp direction and the weft direction of the reinforcing cloth was measured according to JIS L1096. However, the width of the reinforcing cloth was 25.4 mm and the length was 10 mm.
(6) Peeling adhesive force in the warp direction and weft direction The peeling adhesive force is a value indicating the peeling adhesive force between the reinforcing cloth and the rubber. The reinforcing cloths are arranged adjacent to each other with a width of 25.4 mm, and the adhesive strength when peeling from the rubber is evaluated at room temperature (indicated as "room temperature adhesive strength" in the table), and further evaluated under the condition of 100 ° C (in the table, ""High temperature adhesion". As the rubber for evaluation, H-NBR rubber produced by the following composition was used, and vulcanized by applying a pressing pressure of 1 MPa for 30 minutes at a temperature of 180 ° C.
(Composition)
Hydrogenated acrylonitrile-butadiene rubber: 100 parts Carbon black: 50 parts Zinc oxide: 5 parts Plasticizer TOTM: 5 parts Stearic acid: 0.5 parts Antioxidant (Nowguard 445): 1.5 parts Anti-aging agent (Nocrac MBZ ): 1 part Silica: 8 parts where "parts" means parts by weight.

[Example 1]
(Manufacture of plain weave)
As the warp, two 40-count meta-type aromatic polyamide fiber spun yarns (Conex high-strength type manufactured by Teijin Ltd.) were used 700 times / meter, and the para-copolymerized aromatic polyamide fiber check-cut yarn 220dtex (Teijin Co., Ltd.) was used. Technora T400 manufactured by TECHNORA Co., Ltd. was used with a cord (double-covered as “meta-aramid + copolymeric para-aramid” in Table 1) double-covered on the outer periphery of elastic modulus 490 cN / dtex). A cord similar to the warp was used for the weft. A plain woven fabric was woven so that the woven fabric density of the warp and the weft was 10 / inch.

(Manufacture of adhesive treatment agent)
To 223.5 g of water were added 13.3 g of a 10% aqueous solution of sodium hydroxide, and 17.0 g of resorcin was added and stirred therein. Then, 14.9 g of formalin (concentration 37% by weight) was added thereto and stirred. After the whole was dissolved, this was left to stand in an atmosphere at 20 ° C. for 4 hours for pre-aging. After a lapse of a predetermined time, 281.3 g of hydrogenated acrylonitrile-butadiene rubber latex (Zetopol 2230LX, manufactured by Nippon Zeon Co., concentration 40% by weight, referred to as “HNBR latex” in Table 1) was slowly added thereto while further stirring, and further 24 It was left to stand for a time and pre-aged. After that, 450.0 g of chlorophenol / resorcinol / formalin condensate (Nagase Chemtex Co., Ltd., Denabond, concentration 20% by weight) was added with stirring, and the mixture was allowed to stand for 2 hours and then condensed with chlorophenol / resorcinol / formalin and rubber. An aqueous dispersion of an adhesive treatment agent containing latex as a constituent component (described as "chlorophenol-containing RFL" in Table 1) was prepared.

(Treatment with adhesive treatment agent)
The plain woven fabric obtained above was dipped in a prepared aqueous dispersion of an adhesive treatment agent, dried at 130 ° C. for 2 minutes, and then heat-treated at 235 ° C. for 1 minute to obtain a belt reinforcing fabric.

  A total of 9.0% by weight of a condensate of chlorophenol, a resorcin, a formalin, and a rubber latex was adhered to the obtained reinforcing cloth for a belt, based on the weight of the reinforcing cloth. The results of evaluation of the obtained reinforcing cloth for belt are summarized in Table 1.

[Example 2]
As a warp, one meta-type aromatic polyamide fiber spun yarn 20 count (Teijin Co., Ltd. Conex high-strength type, referred to as "meta-aramid" in Table 1) was used, and the warp density was 20 yarns / inch. A belt reinforcing cloth was obtained in the same manner as in Example 1. The evaluation results of the obtained reinforcing cloth for belt are summarized in Table 1.

[Example 3]
As a weft, a co-polymer type para-type aromatic polyamide fiber stretch-cutting yarn 220 dtex (Teijin Co., Ltd. Technora T400 elastic modulus 490 cN / dtex, shown as "copolymer para-aramid" in Table 1) was used alone, and weft density A reinforcing cloth for belts was obtained in the same manner as in Example 2 except that weaving was carried out at 27 fibers / inch. The evaluation results of the obtained reinforcing cloth for belt are summarized in Table 1.

[Example 4]
Except that styrene-butadiene-vinylpyridine latex (manufactured by Nippon Zeon Co., Ltd., 2518FS, concentration 40% by weight, referred to as "VP latex" in Table 1) was used as the latex instead of hydrogenated acrylonitrile-butadiene rubber latex. A reinforcing cloth for belt was obtained in the same manner as in Example 1. The evaluation results of the obtained reinforcing cloth for belt are summarized in Table 1.

[Comparative Example 1]
A cord that double-covers the outer circumference of the co-polymerized para-type aromatic polyamide fiber check-cut yarn 220dtex with one nylon 66 fiber spun yarn 20 count as the warp and two nylon 66 fiber spun yarn 40 counts as the weft. A reinforcing fabric for a belt was obtained in the same manner as in Example 2 except that "Nylon 66 + copolymer type para-aramid" was used in 1). The evaluation results of the obtained reinforcing cloth for belt are summarized in Table 1.

[Example 5]
(Manufacture of plain weave)
As the warp, two 40-count meta-type aromatic polyamide fiber spun yarns (Conex high-strength type manufactured by Teijin Ltd.) were used 700 times / meter, and the para-copolymerized aromatic polyamide fiber check-cut yarn 220dtex (Teijin Co., Ltd.) was used. TECHNORA T400 manufactured by Technora Co., Ltd., a code (double-covered as “meta-aramid + copolymeric para-aramid”) double-covered on the outer circumference was used. A cord similar to the warp was used for the weft. A plain woven fabric was woven so that the woven fabric density of the warp and the weft was 25 threads / inch.

(Manufacture of adhesive treatment agent)
14.5 g of resorcinol-formalin initial condensate (Sumikanol 700S, Sumitomo Chemical Co., Ltd., concentration 65% by weight) having a resorcin / formalin (R / F) molar ratio of 1 / 0.6 was added to 154.5 g of water. It was dissolved in an alkaline aqueous solution to which 5.0 g of 10% caustic soda water and 19.9 g of 20% ammonia water were added, and 425 g of hydrogenated nitrile rubber latex (Zetopol 2230LX, manufactured by Nippon Zeon Co., Ltd., concentration 40% by weight) and water 358. 9 g was added. To this solution, 16.8 g of 37% by weight formalin water was added, and the mixture was aged at 20 ° C. for 48 hours, and the main treating agent containing resorcin / formalin / rubber latex having a solid content concentration of 19.4% by weight (Table 2). Then, an aqueous dispersion of "RFL" was prepared.

  In addition, 200 g of hydrogenated nitrile rubber latex (Zetopol 2230LX, manufactured by Nippon Zeon Co., Ltd., concentration 40% by weight), 125 g of chlorosulfonated polyethylene rubber latex (Sepolex CSM, manufactured by Sumitomo Seika Chemical Co., Ltd., concentration 30%) and ε-caprolactam block. 55 g of dodiphenylmethane diisocyanate (DM3031, manufactured by Meisei Chemical Industry Co., Ltd., concentration: 54% by weight), 10 g of zinc oxide, 10 g of carbon black and 550 g of water were added to the second treatment agent having a solid content concentration of 20.0% by weight (Table 2). Then, an aqueous dispersion of “HNBR latex + crosslinking agent”) was prepared.

(Treatment with adhesive treatment agent)
The plain woven fabric obtained above is dipped in an aqueous dispersion of a main treating agent containing the resorcinol / formalin / rubber latex as a constituent component, dried at 130 ° C. for 2 minutes, and then heat treated at 235 ° C. for 1 minute. After further immersing in a water dispersion of the second treatment agent, it was dried at 150 ° C. for 120 seconds at a constant length to obtain a belt reinforcing cloth.

  In the obtained reinforcing cloth for belt, the main treating agent having resorcin / formalin / rubber latex as a constituent component was 9.2% by weight and the second treating agent was 11.9% by weight, based on the weight of the woven fabric of the reinforcing cloth. It was attached. The evaluation results of the obtained reinforcing cloth for belt are summarized in Table 2.

[Example 6]
Reinforcing cloth for belts was carried out in the same manner as in Example 5 except that one meta-type aromatic polyamide fiber spun yarn 20 count (Teijin KK Conex high tenacity type, indicated as "meta-aramid" in the table) was used as the warp. Got The evaluation results of the obtained reinforcing cloth for belt are summarized in Table 2.

[Example 7]
A reinforcing fabric for a belt was obtained in the same manner as in Example 5, except that one weft yarn of nylon 66 fiber spun yarn was used as the weft yarn. The evaluation results of the obtained reinforcing cloth for belt are summarized in Table 2.

[Example 8]
A reinforcing fabric for belts was obtained in the same manner as in Example 5 except that the treatment with the aqueous dispersion of the second treatment agent was not performed. The evaluation results of the obtained reinforcing cloth for belt are summarized in Table 2.

[Example 9]
Sorbitol-based polyepoxide compound (SR-SEP manufactured by Sakamoto Yakuhin Kogyo Co., Ltd.), ε-caprolactam blocked MDI (S3 manufactured by Meisei Chemical Co., Ltd.) and vinyl pyridine-styrene-butadiene terpolymer latex (Pyratex manufactured by A & L Japan Co., Ltd.), respectively. The solids were mixed at a ratio of 30% by weight, 30% by weight and 40% by weight to prepare an aqueous dispersion of a third treatment agent (denoted as "epoxy" in Table 2) having a total solid content of 10% by weight. After immersing the plain woven fabric in the aqueous dispersion of the third treatment agent, it was dried at a temperature of 130 ° C. for 2 minutes and then heat-treated at a temperature of 240 ° C. for 1 minute, and then resorcin / formalin / rubber latex was added. A reinforcing cloth for belts was obtained in the same manner as in Example 8 except that the main treating agent as a constituent was immersed in an aqueous dispersion. The evaluation results of the obtained reinforcing cloth for belt are summarized in Table 2.

[Example 10]
Sorbitol-based polyepoxide compound (SR-SEP manufactured by Sakamoto Yakuhin Kogyo Co., Ltd.), ε-caprolactam blocked MDI (S3 manufactured by Meisei Chemical Co., Ltd.) and vinyl pyridine-styrene-butadiene terpolymer latex (Pyratex manufactured by A & L Japan Co., Ltd.), respectively. The solids were mixed at a ratio of 30% by weight, 30% by weight and 40% by weight to prepare an aqueous dispersion of a third treating agent (denoted as "epoxy" in Table 2) having a total solid content of 10% by weight. After immersing the plain woven fabric in the aqueous dispersion of the third treatment agent, it was dried at a temperature of 130 ° C. for 2 minutes and then heat-treated at a temperature of 240 ° C. for 1 minute, and then resorcin / formalin / rubber latex was added. A reinforcing cloth for a belt was obtained in the same manner as in Example 5, except that the main treating agent as a constituent was immersed in an aqueous dispersion. The evaluation results of the obtained reinforcing cloth for belt are summarized in Table 2.

[Comparative Example 2]
A cord that double-covers the outer circumference of the co-polymerized para-type aromatic polyamide fiber check-cut yarn 220dtex with one nylon 66 fiber spun yarn 20 count as the warp and two nylon 66 fiber spun yarn 40 counts as the weft. Then, a reinforcing cloth for a belt was obtained in the same manner as in Example 5, except that "nylon 66 + copolymer type para-aramid" was used. The evaluation results of the obtained reinforcing cloth for belt are summarized in Table 2.

  As a result of the results shown in Table 2, a belt using a reinforcing cloth having a high strength after immersion in high temperature oil and a high strength after a subsequent abrasion test has higher durability of the belt. Further, in a belt having a low adhesive strength at high temperature, the reinforcing cloth is peeled off during the belt durability test, which leads to early breakage of the belt. Since the physical properties of the reinforcing cloth oriented in the longitudinal direction of the belt are more influential to the durability of the belt, it is preferable to arrange the yarn having excellent strength and adhesive force so as to be oriented in the longitudinal direction of the belt.

  The belt reinforcing cloth of the present invention can be used for reinforcing belts such as transmission belts. In particular, it can be suitably used for reinforcing a toothed belt using hydrogenated acrylonitrile-butadiene rubber as a tooth rubber. The belt using the reinforcing cloth for a belt of the present invention can be suitably used in a high temperature / high load environment, an environment in contact with oil or water, particularly an environment in oil.

Claims (10)

  A reinforcing fabric for a belt, comprising a woven fabric and an adhesive treatment agent attached to the woven fabric, which is used for reinforcing a belt, wherein the adhesive treatment agent contains rubber latex, and the woven fabric includes a meta-type aromatic polyamide fiber and an elastic material as fibers constituting the woven fabric. A reinforcing fabric for a belt, comprising a high elastic modulus organic fiber having a modulus of 300 cN / dtex or more.   The total content of the meta-type aromatic polyamide fiber and the high elastic modulus organic fiber having an elastic modulus of 300 cN / dtex or more in the fibers constituting the woven fabric accounts for 50% by weight or more based on the total weight of the fibers constituting the woven fabric, The reinforcing cloth for a belt according to claim 1, wherein the content ratio of the group polyamide fiber and the high elastic modulus organic fiber is 20:80 to 80:20 by weight.   The reinforcing fabric for a belt according to claim 1 or 2, wherein one of the warp yarn and the weft yarn of the woven fabric contains meta-type aromatic polyamide fiber, and the other contains a high elastic modulus organic fiber having an elastic modulus of 300 cN / dtex or more.   The adhesive treatment agent is a condensate of chlorophenol, resorcin, formalin, and rubber latex, and the amount of the adhesion treatment agent attached is 2 to 20% by weight relative to the weight of the woven fabric. Reinforcement cloth for belt.   The adhesion treatment agent is a main treatment agent containing a condensate of resorcin and formalin and a rubber latex, and a second treatment agent containing an acrylonitrile-butadiene rubber latex or hydrogenated acrylonitrile-butadiene rubber latex and a cross-linking agent. The reinforcing fabric for a belt according to any one of claims 1 to 3, wherein the agent forms a layer in contact with the fibers of the woven fabric, and the second treating agent exists in a layer outside the layer of the main treating agent.   The adhesive treatment agent is a main treatment agent containing a condensate of resorcin and formalin and rubber latex and a third treatment agent containing an epoxy compound, and the third treatment agent forms a layer in contact with the fibers of the woven fabric, The reinforcing cloth for belts according to any one of claims 1 to 3, wherein the treatment agent is present in a layer outside the third treatment agent layer.   The meta-aromatic polyamide fiber of at least one of the warp and the weft of the woven fabric is a composite cord of a meta-aromatic polyamide fiber and a high elastic modulus organic fiber having an elastic modulus of 300 cN / dtex or more. The reinforcing cloth for belt according to any one of 1.   8. The reinforcing cloth for a belt according to claim 7, wherein the composite cord is a composite cord obtained by covering the spun yarn or the stretch-cutting yarn of the para-type aromatic polyamide fiber with the spun yarn or the stretch-cutting yarn of the meta-type aromatic polyamide fiber. ..   The reinforcing cloth for belt according to claim 4, wherein the rubber latex is acrylonitrile-butadiene rubber latex or hydrogenated acrylonitrile-butadiene rubber latex.   A toothed belt using the reinforcing cloth for a belt according to any one of claims 1 to 9 as a reinforcing cloth, the toothed belt using a hydrogenated acrylonitrile-butadiene rubber as a tooth rubber, which is used in an oil environment belt.