JP2004003044A - Fiber cord for reinforcing and toothed belt using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fiber cord for reinforcing by improving the heat resistance of the fiber cord bonded and embedded in a rubber compound of a toothed belt and improving the strength retention after flexural fatigue and to provide the toothed belt using the fiber cord. <P>SOLUTION: The fiber cord for reinforcing comprises a cord composed of nontwist or twisted inorganic fibers. The cord is obtained by treatment with an RFL liquid containing a hydrogenated nitrile rubber latex comprising an alkylphenol formaldehyde resin added thereto and a styrene-butadiene-vinylpyridine terpolymer rubber latex and subjecting the treated cord to an overcoating treatment with a rubber cement prepared by dissolving a chlorosulfonated polyethylene formulation with a solution. <P>COPYRIGHT: (C)2004,JPO

Description

【００３４】
【表２】

【００３５】
【表３】

【００３６】
次に、ベルト作製用のＳＴＰＤ歯形１０５歯数の金型に表４に示す２／２折りの歯布Ｄ−１を接着処理し、この歯布を金型に巻き付けた後、表１に示すガラス繊維コードを歯布が巻き付けられた金型の歯布の上から巻き付けを行い、さらに、表−５のＨ−ＮＢＲゴム配合からなるゴムシートＥ−１を巻き付けた後、加硫缶に投入して通常の圧力方式により歯形を形成させた後、１０９℃にて２０分加圧加硫して、ベルト背面を一定厚さに研磨し一定幅に切断して走行用歯付ベルトを得た。
【００３７】
【表４】

【００３８】
【表５】

【００３９】
作製したベルトのサイズは、ベルト幅１９．１ｍｍ、ベルト歯形ＳＴＰＤ、歯数１０５歯、歯ピッチ８．０００ｍｍであり、通常Ｓ８Ｍと表示される。次に得られた歯付ベルトを用いて走行試験を行った。走行試験装置として、図２に示す２１歯の駆動プーリ１０、４２歯の従動プーリ１１に歯付ベルトを取り付け、背面に直径５２ｍｍの平プーリ１２を当接させてなる試験装置を使用する。雰囲気温度１３０℃、負荷３．６７ｋｗ、初張力１４７Ｎ、駆動側回転数７２００ｒｐｍの条件下で１０００時間の走行試験を行った。試験終了後、取り外した歯付ベルトを長さ２５０〜３００ｍｍに切り取って短冊状にしたものを引張試験片とした。次に引張速度５０ｍｍ／ｍｉｎで前記引張試験片のベルト強力を測定し、引張速度５０ｍｍ／ｍｉｎで走行試験前のベルト強力を測定した値で除して強力保持率を求めた。これを屈曲疲労後の強力保持率とした。表６に各ベルトの屈曲疲労後の強力保持率の結果をまとめて示す。
【００４０】
【表６】

【００４１】
表６から通常のＲＦＬ処理液で処理された比較例１より、アルキルフェノールフォルムアルデヒド樹脂が添加された水素化ニトリルゴムラテックス及びスチレン−ブタジエン−ビニルピリジン三元共重合体ゴムラテックスを含むＲＦＬ液にて処理された実施例１や実施例１で処理したＲＦＬ処理液の水素化ニトリルゴムからカルボキシル水素化ニトリルゴムに換わった実施例２の屈曲疲労後の強力保持率が向上していることがことがわかる。また、強力保持率が向上することにより高負荷下で発生するベルト損傷によるベルト寿命も長寿命化することが考えられる。
【００４２】
【発明の効果】
以上のように、本発明は、補強用繊維コードの耐熱性を改善し、ゴム配合物との接着力を向上させ、高雰囲気温度下での屈曲疲労後の強力保持率を向上させ、高負荷下で発生するベルト損傷によるベルト寿命を長寿命化することができ、ベルトの耐久性を大幅に向上させることができるという効果がある。
【図面の簡単な説明】
【図１】本発明に係る歯付ベルトの概略斜視図である。
【図２】歯付ベルトの走行試験装置の概略図である。
【符号の説明】
Ａ　歯付ベルト
１　補強用繊維コード
２　背部
３　歯部
４　歯布
５　ゴム[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a camshaft of an automobile engine, or a camshaft and an injection pump, or an adhesive embedded in a rubber compound for reinforcing a toothed belt used for synchronous transmission of a general industrial machine. The present invention relates to a reinforcing fiber cord and a toothed belt using the same.
[0002]
[Prior art]
Toothed belts that drive camshafts, injection pumps, oil pumps, water pumps, etc. of automobile engines increase the load on the belts due to the higher output of the engine and increase the ambient temperature due to the compact engine room. In recent years, the use environment of the toothed belt has become particularly severe, and further improvement in durability is required.
[0003]
Although chloroprene rubber has been mainly used for conventional toothed belts, cracks were found to occur earlier than the back rubber portion under a high ambient temperature. For this reason, hydrogenated nitrile rubber developed as a heat-resistant polymer has recently been used for toothed belts. Further, rubbers using a peroxide as a vulcanization system and rubber compounds using an unsaturated metal carboxylate as a hydrogenated nitrile rubber are also used as a matrix of the toothed belt. Accordingly, the method of bonding the reinforcing fiber cord to the hydrogenated nitrile rubber has been improved.
[0004]
For example, there is a method for bonding a reinforcing fiber cord and a hydrogenated nitrile rubber composition disclosed in JP-A-2000-212878. This is a treatment with a pretreatment liquid containing a nitrile rubber-modified epoxy resin and an alkylphenol formaldehyde resin, followed by a treatment with an RFL liquid comprising a nitrile rubber compound or a hydrogenated nitrile rubber latex. Further, there is a method of treating with an RFL solution composed of acrylonitrile-butadiene rubber latex containing a carboxyl group, which is disclosed in Japanese Patent Publication No. 60-24131. In addition, there is disclosed a method of treating with an RFL solution comprising vinylpyridine rubber latex, chlorosulfonated polyethylene rubber latex, and styrene-butadiene rubber latex.
[0005]
As described above, although the water resistance of the reinforcing fiber cord and the hydrogenated nitrile rubber (hereinafter, referred to as H-NBR) was sufficiently improved by the treatment method described above, these treated reinforcing fiber cords were used. It has been found that when the toothed belt using the core wire is subjected to heat-resistant bending under a high ambient temperature, the RFL layer is deteriorated early and the core wire is subjected to bending fatigue. Further, it has been pointed out that in the case of hydrogenated nitrile rubber using sulfur for the vulcanization system of H-NBR, cracks occur in the back rubber portion earlier than in the peroxide portion, leading to a belt life. In addition, in the peroxide vulcanization system of H-NBR, in the case of the conventional RFL liquid, the RFL reacts with the peroxide of the vulcanizing agent to accelerate the deterioration of the RFL, and the high temperature of the core itself under the high ambient temperature. Fatigue resistance at low temperature cannot be satisfied with the required life, and in the case of vulcanized hydrogenated nitrile rubber composed of peroxide, radicals move to the RFL of the core wire during vulcanization. However, there is a problem that it is easily deteriorated at an early stage.
[0006]
[Problems to be solved by the invention]
The present invention relates to a reinforcing fiber cord which improves the heat resistance of a reinforcing fiber cord embedded and embedded in a rubber compound of a toothed belt and improves the strength retention after bending fatigue, and a toothed belt using the same. The purpose is to provide a belt.
[0007]
[Means for Solving the Problems]
The cord composed of the untwisted or twisted inorganic fibers according to claim 1 of the present invention is a hydrogenated nitrile rubber latex to which an alkylphenol formaldehyde resin is added, and a styrene-butadiene-vinylpyridine terpolymer. It is characterized by being treated with an RFL solution containing rubber latex and overcoated with a rubber paste obtained by dissolving a chlorosulfonated polyethylene compound in a solution.
The heat resistance is improved by treating the cord with the RFL solution, and the reinforcing fiber cord formed by overcoating with rubber paste improves the adhesive strength with the rubber compound. be able to.
[0008]
In the reinforcing fiber cord according to claim 2, in claim 1, the weight ratio of the hydrogenated nitrile rubber latex to the styrene-butadiene-vinylpyridine terpolymer rubber latex is 60/40 to 90/10. Things.
The weight ratio of the hydrogenated nitrile rubber latex to the styrene-butadiene-vinylpyridine terpolymer rubber latex contained in the RFL solution is preferably 60/40 to 90/10. When the weight ratio is 60/40 or less, the heat resistance decreases. When the weight ratio is 90/10 or more, the water resistance decreases.
[0009]
The reinforcing fiber cord according to claim 3, wherein the cord composed of non-twisted or twisted inorganic fiber is a carboxyl hydrogenated nitrile rubber latex to which an alkylphenol formaldehyde resin is added alone or a carboxyl hydrogenated nitrile. It is treated with an RFL solution containing a rubber latex and a styrene-butadiene-vinylpyridine terpolymer rubber latex, and further overcoated with a rubber paste obtained by dissolving a chlorosulfonated polyethylene compound in a solution. Is what you do.
The heat resistance is improved by treating the cord with the RFL solution, and the reinforcing fiber cord formed by overcoating with rubber paste improves the adhesive strength with the rubber compound. be able to.
[0010]
A reinforcing fiber cord according to a fourth aspect is the reinforcing fiber cord according to any one of the first to third aspects, wherein the inorganic fibers are glass fibers.
When the material of the cord is glass fiber, the dimensional stability and the adhesiveness are improved, and the bending fatigue resistance under a high ambient temperature can be improved.
[0011]
A toothed belt according to a fifth aspect uses the reinforcing fiber cord according to any one of the first to fourth aspects.
By using a reinforcing fiber cord treated with an RFL solution with improved heat resistance for the core wire bonded and embedded in the rubber compound of the toothed belt, the adhesive force with the rubber compound is improved, and after bending fatigue. Strong retention can be improved.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an example of an embodiment of the present invention will be described. The reinforcing fiber cord and the toothed belt according to the present invention are not limited to the following embodiments.
[0013]
FIG. 1 is an overall perspective schematic view of a toothed belt A according to the present embodiment. In FIG. 1, a toothed belt A is embedded in a plurality of teeth 3 made of rubber 5 as a base material arranged at predetermined intervals along a longitudinal direction, a back 2 continuous with the teeth 3, and a back 2. It is a configuration having a reinforcing fiber cord 1 and a tooth cloth 4 coated on the surface of the tooth portion 3.
[0014]
The material of the rubber 5 serving as the base material of the tooth portion 3 and the back portion 2 is not particularly limited, and an appropriate material is appropriately selected according to use conditions. In the case of toothed belts for automobile engines and various engines, H-NBR, CR, CSM, etc. having heat resistance and oil resistance are used. Toothed belts used in general industrial machines include NBR, EPDM, ethylene propylene copolymer (EPR), SBR, isopropylene rubber (IR), and natural rubber (NR) in addition to H-NBR, CR, and CSM. Fluoro rubber, silicon rubber and the like can be used. In this embodiment, the rubber 5 is formed by crosslinking H-NBR or a compounded rubber obtained by compounding an unsaturated carboxylic acid metal salt with H-NBR, and either an organic peroxide or a sulfur compound. Will be exemplified.
[0015]
The H-NBR has a hydrogenation rate of 80% or more, and preferably has a hydrogenation rate of 90% or more, and more preferably 92 to 98% in order to exhibit heat resistance and ozone resistance characteristics. When the hydrogenation rate is 80% or less, H-NBR extremely deteriorates in heat resistance and ozone resistance. In consideration of oil resistance and cold resistance, the amount of bound acrylonitrile is preferably 20 to 45%. When the amount of bound acrylonitrile is 20% or less, oil resistance decreases, and when the amount of bound acrylonitrile is 45% or more, cold resistance decreases.
[0016]
Further, by adding a metal salt of an unsaturated carboxylic acid to the H-NBR, the modulus (tensile modulus) and hardness are increased, and the modulus (tensile modulus), elongation at break, and higher modulus are increased. In order to secure the tear strength and the hardness, it is preferable to mix 15 to 40 parts by mass of the unsaturated carboxylic acid metal salt with H-NBR based on the total polymer as described above. Alternatively, 5 to 15 parts by mass of an unsaturated carboxylic acid metal salt may be mixed, and 1 to 20 parts by mass of the short fiber may be blended with respect to the polymer component 100.
[0017]
Here, as the short fibers, cotton, vinylon, aramid, inorganic fibers, and the like that do not have a high melting point or a melting point that is difficult to melt at a low temperature during friction are preferable. Its length is preferably 5 mm or less. If the fiber length exceeds 5 mm, the rubber tends to be oriented when it is rolled into a rolled sheet by a calender or an extruder or the like, and when it becomes a belt, cracks tend to occur early due to bending. The orientation of the short fibers is preferably the belt width direction, but may be the belt length direction. If the blending amount of the short fibers is less than 1 part by mass, the effect of blending the short fibers will not be exhibited. On the other hand, if the amount of the short fiber is more than 20 parts by mass, the Mooney viscosity of the rubber increases, and processing (poor dispersion in the kneading process, unrollable in the sheet rolling process, poor surface texture, lack of thickness, etc.) cannot be performed, and tooth It is difficult to form a high precision.
[0018]
If the amount of the unsaturated carboxylic acid metal salt is less than 5 parts by mass, the rubber hardness does not reach the predetermined hardness. On the other hand, if it exceeds 40 parts by mass, the rubber hardness becomes too large, the belt rigidity becomes high, and the fatigue life becomes short due to poor bending fatigue. As described above, by using the rubber in which the unsaturated carboxylic acid metal salt is blended with H-NBR, the back surface hardness of the back portion 2 can be 80 degrees or more (JISA type hardness meter). Since the back surface hardness can be 80 degrees (JISA type hardness meter) or more, preferably 85 degrees or more, deformation of rubber can be suppressed even when stress is applied.
[0019]
Unsaturated carboxylic acid metal salts are those in which an unsaturated carboxylic acid having a carboxyl group and a metal are ion-bonded. Examples of the unsaturated carboxylic acid include monocarboxylic acids such as acrylic acid and methacrylic acid, maleic acid, fumaric acid, and itacone. Dicarboxylic acids such as acids are preferred, and metals such as beryllium, magnesium, calcium, strontium, barium, titanium, chromium, molybdenum, manganese, iron, cobalt, nickel, copper, silver, zinc, cadmium, aluminum, tin, lead, and antimony Etc. can be used.
[0020]
After being compounded as described above, the rubber 5 is formed by crosslinking with either an organic peroxide or a sulfur compound.
[0021]
The organic peroxide is not particularly limited, but may be any conventionally used organic peroxide. For example, t-butyl hydroperoxide, 1,1,3,3-tetrabutyl hydroperoxide, p-menthane hydroperoxide, cumene hydroperoxide, p-menthane hydroperoxide, cumene hydroperoxide, cumene hydroperoxide and cumene hydroperoxide. Hydroperoxide, di-isopropylpropylbenzene hydroperoxide, di-tetra-butyl peroxide, dicumyl peroxide, dicumyl peroxide, dicumyl peroxide, dicumyl peroxide, dicumyl peroxide butyl cumy l-peroxyd), 1,3-bis (tert-butylperoxyisopropyl) benzene (1,3-bis (tert-butylperoxyisopropyl) benzene), and trialkyl isocyanurate.
[0022]
Examples of the sulfur compound include common sulfur and sulfur compounds, and examples of the vulcanizing agent include thiurams, dithiocarbamate (Salt of Dithiocarbates), sulfonamides, and thiazoles. Can be done. Further, an organic compound, a sulfur compound and a vulcanizing agent may be used in combination.
[0023]
In the present embodiment, glass fibers, which are inorganic fibers, are used for the reinforcing fiber cord 1 embedded in the back portion 2 composed of the rubber 5 as a base material as described above. The inorganic fibers include carbon fibers, metal fibers, glass fibers, and the like, and any of them can be used as a reinforcing fiber cord. The composition of the glass fiber may be either E glass or S glass (high-strength glass), and is a twisted cord obtained by twisting glass fiber filaments. 10 cm, obtained by twisting 12 times / 10 cm, and is not particularly limited by the thickness of the filament, the number of bundled filaments and the number of strands. The reinforcing fiber cord 1 is not limited to the above-described twisted cord, but may be a non-twisted cord.
[0024]
This reinforcing fiber cord 1 is obtained by treating an untreated untwisted cord or a twisted cord with a solution obtained by adding an alkylphenol formaldehyde resin to an RFL solution obtained by mixing a resorcinol and an initial condensate of formalin and rubber latex. Heat treatment at ℃. Next, a chlorosulfonated polyethylene compound as an overcoat solution is immersed in a rubber paste dissolved in a solvent such as an aromatic hydrocarbon such as toluene or xylene, treated, and heat-treated at about 130 to 180 ° C.
[0025]
The RFL liquid is composed of a rubber latex in which a hydrogenated nitrile rubber latex to which an alkylphenol formaldehyde resin is added and a styrene-butadiene-vinylpyridine terpolymer rubber latex mixed at a weight ratio of 75/25. . The RFL solution is obtained by mixing an initial condensate of resorcinol and formalin with the rubber latex. In this case, the molar ratio of resorcinol to formalin is desirably 3/1 to 1/3 in order to enhance the adhesive strength. The initial condensate of resorcinol and formalin is mixed so that the resin content is 5 to 100 parts by weight with respect to 100 parts by weight of the rubber latex, and the total solid concentration is adjusted to 5 to 40%. Is done.
[0026]
Further, the hydrogenated nitrile rubber latex to which the alkylphenol formaldehyde resin is added in the RFL liquid has excellent heat resistance as compared with chlorosulfonated polyethylene latex and styrene butadiene rubber latex, and increases in hardness when thermally aged in a film form. Styrene-butadiene-vinylpyridine terpolymer rubber latex has a remarkably strong dipole or hydrogen bonding interaction with resorcinol-formalin resin. On the other hand, it has been confirmed that the interaction between the styrene-butadiene rubber latex and the RF resin is extremely weak and only physical.
[0027]
In addition to the above-described RFL liquid composition, a carboxyl hydrogenated nitrile rubber latex to which an alkylphenol formaldehyde resin is added alone, or a carboxyl hydrogenated nitrile rubber latex and a styrene-butadiene-vinylpyridine terpolymer rubber latex are used. By treating with the RFL solution containing, it is possible to improve the heat resistance and the adhesiveness between the filaments of the inorganic fiber and the glass fiber as the reinforcing fiber cord. Further, the carboxyl hydrogenated nitrile rubber latex to which the alkylphenol formaldehyde resin is added in the RFL solution has a higher adhesiveness between the inorganic fiber and glass fiber filaments than the one to which the hydrogenated nitrile rubber latex is added. Can be improved.
[0028]
Nylon, aramid, polyester, polybenzoxazole, cotton, or the like is used as a material of the fiber material constituting the tooth cloth 4. The form of the fiber may be any of a filament yarn and a spun yarn, and may be a twisted yarn of a single composition, a mixed twisted yarn, or a mixed spun yarn. Further, the weaving structure may be any of twill weave, satin weave, plain weave and the like.
[0029]
After being treated with an RFL solution, an isocyanate solution or an epoxy solution, the tooth cloth 4 is subjected to a rubber paste treatment of impregnating and adhering a rubber of the same quality as the rubber 5 used for the tooth portion 3 and vulcanizing the same. Specifically, after preparing a rubber paste in which a polymer component used for the rubber 5 is dissolved by a solvent, this is impregnated and adhered, dried, and then vulcanized to obtain a canvas with rubber. Further, an antioxidant can be added as needed.
[0030]
As a solvent for dissolving the rubber 5, a solvent selected from methyl ethyl ketone (MEK), dimethyl sulfoxide, dimethylformamide, chloroform and the like can be used. The rubber paste obtained by dissolving the rubber 5 is preferably impregnated and adhered to the tooth cloth 4 by coating, spraying, or the like, and vulcanized.
[0031]
The toothed belt A is configured as described above, and the reinforcing fiber cord having improved heat resistance is bonded and embedded in the rubber compound of the toothed belt A, so that the belt after bending fatigue under a high ambient temperature is obtained. Strong retention can be improved.
[0032]
【Example】
Next, the present invention will be described specifically with reference to examples.
(Example)
The processing shown in Table 1 was performed on the reinforcing fiber cord to obtain A-1, A-2, and A-3. In the RFL treatment in Table 1, three 3.7d non-twisted yarns composed of a glass fiber filament group were immersed in RFL solutions B-1, B-2, and B-3 shown in Table 2. Thereafter, heat treatment was performed at 230 to 280 ° C. The overcoating treatment with the rubber glue shown in Table 1 is performed by preparing a single twisted cord in the S direction and the Z direction at a twist of 8 times / cm with the glass fiber which has been RFL-treated on the rubber glue C-1 shown in Table 3. Then, 11 to 13 of them were aligned and twisted at 12 times / cm, and immersed, and heat-treated at about 130 to 180 ° C.
[0033]
[Table 1]

[0034]
[Table 2]

[0035]
[Table 3]

[0036]
Next, a 2 / 2-fold tooth cloth D-1 shown in Table 4 was bonded to a mold having 105 teeth of an STPD tooth form for producing a belt, and the tooth cloth was wound around the mold. A glass fiber cord is wrapped over a tooth cloth of a mold around which a tooth cloth is wrapped, and further, a rubber sheet E-1 made of H-NBR rubber compound shown in Table-5 is wrapped and then put into a vulcanizing can. After a tooth profile was formed by a normal pressure method, pressure vulcanization was performed at 109 ° C. for 20 minutes, and the back surface of the belt was polished to a certain thickness and cut to a certain width to obtain a toothed belt for traveling. .
[0037]
[Table 4]

[0038]
[Table 5]

[0039]
The size of the produced belt is a belt width of 19.1 mm, a belt tooth shape STPD, 105 teeth, and a tooth pitch of 8.000 mm, and is usually indicated as S8M. Next, a running test was performed using the obtained toothed belt. As the running test device, a test device is used in which a toothed belt is attached to a 21-tooth drive pulley 10 and a 42-tooth driven pulley 11 shown in FIG. 2, and a flat pulley 12 having a diameter of 52 mm is brought into contact with the back surface. A running test was performed for 1000 hours under the conditions of an atmosphere temperature of 130 ° C., a load of 3.67 kW, an initial tension of 147 N, and a driving side rotation speed of 7,200 rpm. After the test was completed, the toothed belt that had been removed was cut into a length of 250 to 300 mm and cut into strips, which were used as tensile test pieces. Next, the belt strength of the tensile test piece was measured at a tensile speed of 50 mm / min, and the belt strength before the running test was measured at a tensile speed of 50 mm / min to obtain a strength retention. This was defined as the strength retention after bending fatigue. Table 6 summarizes the results of the strength retention after bending fatigue of each belt.
[0040]
[Table 6]

[0041]
From Comparative Example 1 treated with a normal RFL treatment liquid from Table 6, an RFL liquid containing a hydrogenated nitrile rubber latex to which an alkylphenol formaldehyde resin was added and a styrene-butadiene-vinylpyridine terpolymer rubber latex was used. The strength retention after bending fatigue of Example 1 in which the hydrogenated nitrile rubber of the treated Example 1 or the RFL treatment solution treated in Example 1 was replaced with the carboxyl hydrogenated nitrile rubber was improved. Understand. Further, it is conceivable that the belt life due to belt damage generated under a high load is prolonged due to the improvement in the strength retention rate.
[0042]
【The invention's effect】
As described above, the present invention improves the heat resistance of the reinforcing fiber cord, improves the adhesive force with the rubber compound, improves the strength retention after bending fatigue under a high ambient temperature, and increases the high load. There is an effect that the belt life due to belt damage generated below can be extended, and the durability of the belt can be greatly improved.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of a toothed belt according to the present invention.
FIG. 2 is a schematic view of a running test device for a toothed belt.
[Explanation of symbols]
A Toothed belt 1 Reinforcing fiber cord 2 Back 3 Tooth 4 Tooth cloth 5 Rubber

Claims (5)

A cord composed of untwisted or twisted inorganic fibers is treated with an RFL solution containing a hydrogenated nitrile rubber latex to which an alkylphenol formaldehyde resin is added and a styrene-butadiene-vinylpyridine terpolymer rubber latex And a fiber cord for reinforcement, which is overcoated with a rubber paste obtained by dissolving a chlorosulfonated polyethylene compound in a solution. The reinforcing fiber cord according to claim 1, wherein a weight ratio of the hydrogenated nitrile rubber latex to a styrene-butadiene-vinylpyridine terpolymer rubber latex is 60/40 to 90/10. The cord composed of untwisted or twisted inorganic fibers may be a carboxyl hydrogenated nitrile rubber latex to which an alkylphenol formaldehyde resin is added alone or a carboxyl hydrogenated nitrile rubber latex and a styrene-butadiene-vinylpyridine ternary. A reinforcing fiber cord which is treated with an RFL solution containing a polymer rubber latex, and further overcoated with a rubber paste obtained by dissolving a chlorosulfonated polyethylene compound in a solution. The reinforcing fiber cord according to any one of claims 1 to 3, wherein the inorganic fibers are glass fibers. A toothed belt using the reinforcing fiber cord according to claim 1.

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