JPH06155415A - Non-plywood wood board surface coating processing method - Google Patents

Abstract

PURPOSE:To repeatedly use a non-plywood wooden board as a concrete panel material excellent in water resistance and chemical resistance by bonding a coating material such as a polyolefin film to the surface of the board through a hot melt adhesive. CONSTITUTION:A hot-melt adhesive is applied to the upper and rear surfaces of an MDF board to be cooled to room temp. and a polyolefin film is subsequently applied and bonded to the upper and rear surfaces of the board. The surface coated non-plywood wooden board thus obtained is excellent in water resistance, heat and cold resistance and adhesion durability and a concrete panel material utilizing this board can be repeatedly used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for surface-modifying a non-plywood board and its use. More specifically, the present invention relates to a method of coating and bonding a surface of a non-plywood wood board with a coating material selected from plastics, metal laminate materials thereof, or paper laminate materials thereof, and its use.

[0002]

BACKGROUND OF THE INVENTION Wood boards are generally sliced veneers, plywood obtained by laminating multiple layers of the veneers, particle boards obtained by solidifying wood chips, low-quality wood solidified High density wood fiber reinforced boards are known.
The latter two boards can be classified as non-plywood wood boards. Adhesives for primary processing such as phenol-formalin resin (resole resin), urea resin, urea melamine resin, melamine resin, vinyl acetate resin, polyvinyl alcohol resin, starch paste, etc. Agent compositions are known and are appropriately selected and used according to the application of the wooden board. It is known that the plywood obtained by the above-mentioned wood primary processing adhesive has excellent water resistance strength among wood boards, and one of its main uses is a concrete driving form board (hereinafter abbreviated as control panel). ). Since non-plywood wood board lacks water resistance compared to plywood, its main application is for interior furniture, desks, etc., and it was completely unsuitable as a control panel. Control panel manufacturing techniques include Japanese Patent Laid-Open Nos. 53-132074 and 5
7-2709, JP-A-59-102053, JP-A-59-203673, JP-A-61-68379,
JP-A-61-169573, JP-A-61-20910
No. 7, JP-A No. 62-117954, etc. have been proposed as the main production technology for control panel materials, but all of them are technologies for plywood, and none have been proposed for non-plywood wood boards. In addition, as a review of the recent technological trends concerning control panels, see Lumber Industry, 1992, Volume 3, 1
It is described on pages 33 to 137 under the heading "Use and Present State of Plywood for Concrete Formwork". In view of these contents, metal molds and plastic molds have been proposed and used in recent years instead of plywood in a form corresponding to the problem of protection of wood resources. On the other hand, as a technique for modifying the surface of a non-plywood wood board, the main techniques are: a surface decorative board manufacturing technology by applying a coating composition; a thinly sliced wood foil piece for the above-mentioned wood primary processing. Adhesive processing technology using adhesives, chloroprene adhesives, water-based urethane adhesives, water-based latex adhesives, vinyl-urethane adhesives, etc., which are well known as adhesives for secondary processing of wood The main technologies are surface coating of vinyl chloride resin, paper and metal. In recent years, effective utilization of wood resources and resource protection have been raised as major issues on a global level, and plywood control panels are particularly unacceptable in the market. Therefore, there is a real need for materials that can replace plywood control panels.

[0003]

SUMMARY OF THE INVENTION As described above, the main object is to provide a wood-based reinforced board which can be used as a substitute for a plywood control panel in consideration of protection of wood resources. That is, based on the same idea as the recovery and use of waste paper, non-plywood wood boards obtained by solidifying and molding wood chips and wood fibers, which are attracting attention as a form of reuse of used recovered wood, are used for effective utilization of wood resources. From the standpoint, it is obvious that the most preferable thing is to propose a processing technique that makes it possible to use a well-known non-plywood wood board as a plywood control panel substitute.

[0004]

As a result of intensive studies as means for solving the above-mentioned problems, the following processing method was found and the present invention was achieved. That is, the present invention is as follows. (1) Polypropylene, polyethylene, polyethylene terephthalate, acrylic, on the surface of non-plywood wood board,
Plastics selected from polycarbonate, acrylonitrile-butadiene-styrene resin, ethylene-vinyl acetate resin, ethylene-ethyl acrylate resin, ionomer resin, or a metal laminated material thereof or a laminated paper of any one of them. A method for surface-coating a non-plywood wood board, which is obtained by processing any of the following. A) A non-plywood wood board is heat-melted and vacuum impregnated with a semi-solid or solid hot-melt adhesive at room temperature, and then the covering material is pressure-bonded. B) A non-plywood wood board and / or a covering material is directly melt-coated with a semi-solid or solid hot-melt adhesive at room temperature, and then both members are pressure-bonded. C) A semi-solid or solid hot-melt adhesive at room temperature is previously processed into a single film, and the film-like adhesive is sandwiched between a non-plywood wood board and a covering material for heat compression bonding. D) The non-plywood wood board is previously melted at a melting point of 80 ° C or higher, 15
Semi-solid or solid at room temperature after surface-wax impregnation treatment, which is either passing through a hot-melting bath of wax at 0 ° C. or lower to impregnate the wax, or passing through a wax emulsion bath and then post-heating and drying to impregnate the wax. The coating material is coated and adhered via the hot melt adhesive. E) The non-plywood wood board is passed through a thermosetting resin bath in advance to impregnate the thermosetting resin, the resin is dried and cured, and then the coating material is applied through a semi-solid or solid hot melt adhesive at room temperature. Glue. F) Non-plywood wood board is preliminarily subjected to humidity control or forced drying,
The covering material is adhered by any of the above methods A) to E). (2) The surface coating treatment method for a non-plywood wood board according to (1) above, wherein the non-plywood wood board is a medium-density wood fiber reinforced board. (3) The non-stick according to (1) above, wherein the hot-melt adhesive has an initial physical property of being either tacky or non-tacky at room temperature and has an adhesive heat activation temperature in the range of 70 to 130 ° C. Surface coating processing method for plywood wood board. (4) The hot melt adhesive contains at least 5% by weight of amorphous polypropylene resin, and at least one base selected from the following ethylene-vinyl acetate resin, ethylene-ethyl acrylate resin, styrene block copolymer resin, and ionomer resin. (1) above, which is characterized by containing a composite resin with a resin,
(2) The surface coating treatment method for a non-plywood wood board according to any one of (3). (5) The surface coating treatment method for a non-plywood wood board according to any one of (1) to (4) above, wherein the hot melt adhesive is a reactive curable hot melt adhesive. (6) Only one side of the non-plywood wood board is used as the covering material,
Laminate adhesion processing of one kind selected from polypropylene, polyethylene, and polycarbonate is carried out, and the surface coating processing method of the non-plywood wood board according to any one of (1) to (5) above. (7) High-frequency heating, a hot plate, a heat roll, ultrasonic heating, as a means for heating and pressure-bonding processing when pressure-bonding the covering material.
The method for surface coating treatment of a non-plywood wood board according to any one of the above (1) to (6), characterized in that it is carried out by vacuum heating or the like. (8) The non-plywood wood board obtained by the method according to any one of the above (1) to (7) is used as a concrete-casting form material or as an interior / exterior panel. Applications of surface-coated processed materials of non-plywood wood boards.

The present invention will be described in more detail below. The non-plywood wood board of the present invention means a wood board excluding plywood and veneer, basically a board obtained from wood chips or wood fibers as a raw material, and the wood chips or wood produced from used recovered wood. It can be said that the non-plywood wood board obtained by solidifying and molding the fibers is a material that completely matches the gist of the present invention. Particularly in the present invention, when limited to the use of control panel, it can be said that the non-plywood wood board is preferably a medium density wood fiber reinforced board (hereinafter abbreviated as MDF). The above-mentioned non-plywood wood board may be any board obtained by applying the following wood-based primary processing adhesive to wood chips and wood fibers, and then appropriately adopting the pressure molding and solidifying conditions suitable for the adhesive. , There is no particular limitation. Adhesives for wood-based primary processing are not particularly limited, but adhesion of phenol-formalin resin (resole resin), urea resin, urea melamine resin, melamine resin, vinyl acetate resin, polyvinyl alcohol resin, starch paste, etc. Agent composition. The covering material of the present invention is the following plastics or their metal laminating materials or their paper laminating materials capable of covering one side or both sides or the whole surface of a non-plywood board, such as polypropylene, polyethylene, polyethylene terephthalate. , Acrylic, polycarbonate, acrylonitrile-butadiene-styrene resin, ethylene-vinyl acetate resin, ethylene-ethyl acrylate resin, ionomer resin, plastics selected from them, metal laminated materials thereof, or laminated paper thereof. Is. Particularly preferred are polypropylene, polyethylene and polycarbonate.

The above-mentioned coating material is not particularly limited in its handling form, but generally, a film, a flat plate, a corrugated board, or a foamed material is mentioned, preferably a film having a thickness of 5 mm or less, particularly preferably 1 mm or less. It is better to use a line-shaped covering material. Further, the coating material may be a material on which the interface involved in adhesion is subjected to a known surface treatment for the purpose of improving the adhesiveness, for example, sanding treatment, ozone treatment, corona discharge treatment, strong acid treatment, degreasing treatment, primer treatment and the like. . In the present invention, the coating processing methods for the coating material shown in (A) to (F) above are good, but the reasons are as follows. This is because in the processing method (A), the entire surface of the non-plywood board is completely coated with the adhesive, and the water resistance of the entire board is significantly improved. This is because with the processing methods of (B) and (C), it is possible to perform coating processing easily in a single time, and with (D), it is possible to easily exhibit water resistance to the inside of the board, and this occurs in post processing of the board. This is because it is possible to secure the water resistance of the new wood surface. This is because in (E), higher adhesion reliability and chemical resistance can be exhibited, and the processing method in (F) is stable when the processing methods described in (A) to (E) above are adopted. This is because it is an element that is determined to be essential for obtaining processing performance.

The room temperature semi-solid or solid hot melt adhesive of the present invention is a room temperature semi-solid or solid thermoplastic resin containing a thermoplastic base resin, a tackifier, and optionally a wax and a softening agent. It means either a composition or a reactive hot melt adhesive that can be cured. The former is not particularly limited, but polyethylene resin, polypropylene resin, polystyrene resin, vinyl acetate resin, ethylene-vinyl acetate resin, ethylene-ethyl acrylate resin, ethylene-butyl acrylate resin, ethylene-propylene resin, ethylene-propylene- Diene monomer copolymer resin, styrene-butadiene resin, styrene-butadiene-styrene resin, styrene-
From one or more thermoplastic base resins such as isoprene-styrene resin, styrene-ethylene butylene-styrene resin, styrene-ethylene propylene-styrene resin, butyl rubber, isobutylene rubber, acrylic rubber, acrylonitrile-butadiene resin, ionomer resin, etc. There is one consisting of. Particularly preferably, a composite base resin component containing at least 5% by weight or more of an amorphous polypropylene resin, and at least one selected from ethylene-vinyl acetate resin, ethylene-ethyl acrylate resin, styrene block copolymer resin, and ionomer resin. A thermoplastic resin composition containing a tackifier and optionally a wax or a softening agent is preferable, and it can be said that a good balance of adhesive properties in a low temperature to high temperature range is obtained. The thermoplastic hot melt adhesive of the present invention is not particularly limited, but a composition prepared as a tackifier in an amount of 20 to 60% by weight, a wax in an amount of 0 to 30% by weight, and a softening agent in an amount of 0 to 20% by weight. It is preferable to use the above-mentioned composition which has the property of being tacky or non-tacky at room temperature and which satisfies the processing conditions of the adhesive reactivation temperature of 70 ° C. to 130 ° C./(clamping pressure of 1 to 30 kg / cm ² ). good.

As the reactive hot melt adhesive of the present invention, the following materials can be preferably used. One of them is mainly a diol component such as a polyester-based polyol, a polyether-based polyol, an acrylic polyol or a polycarbonate-based polyol, and a polyisocyanate component having at least two or more active isocyanate groups in the molecule, and an OH group. : Moisture-curable urethane hot melt which is a semi-solid or solid urethane prepolymer at room temperature containing an isocyanate group as a terminal group obtained by reacting in an equivalent ratio of NCO groups of 1: 1.2 to 3 There is adhesive. The polyisocyanate component,
Examples thereof include diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, tolylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, and dimer or polynuclear compounds thereof. Further, as an example of the reactive hot melt adhesive, a trimethoxysilane group, a triethoxysilane group, a monomethyldimethoxysilane group showing a moisture-curing property,
Monomethyldiethoxysilane group, tokuchlorosilane group,
There is a semi-solid or solid olefin resin composition at room temperature in which an active silanol group represented by a dichloromethylsilane group is introduced into the molecule. Further, for example, an isocyanate monomer having an isocyanate group represented by an isocyanate acrylate or an isopropenylphenyl isocyanate compound and a polymerizable unsaturated group can be obtained by copolymerizing with another monomer that can be copolymerized at room temperature. Solid or solid hot melt adhesive compositions are also representative examples.
Among the above, other monomers are, for example, styrene, maleic acid, maleic anhydride, ethylene, butylene, butylene,
Examples include acrylonitrile and other acrylic acid esters. Finally, the reactive hot melt composition containing a moisture-reactive group in the range of 0.1 to 10% by weight, preferably 0.5 to 3% by weight as an active group is preferable.

If necessary, the reactive hot melt resin composition may further contain the following substances and compounded therein.
For example, the above-mentioned various base resins used as thermoplastic hot melt adhesives, tackifiers, waxes, softeners, isocyanate curing cocatalysts represented by dibutyltin dilaurate, fillers, pigments, antioxidants, ultraviolet rays. Examples thereof include absorbers, UV stabilizers, organic thixotropic agents, and surfactants. Those defined as tackifiers are, for example, raw rosin, polymerized rosin, rosin ester derivative, coumarone resin, indene resin, terpene resin, terpene-phenol resin, dicyclopentadiene resin, hydrogenated dicyclopentadiene resin, styrene resin, α- Typical examples are methyl styrene resin, xylene resin, and ketone resin. Moreover, as a substance defined as wax, the melting point is 60 to 150.
In the range of ° C, there are natural waxes such as polyethylene wax, polypropylene wax, Fischer-Tropsch wax, paraffin wax, synthetic wax represented by microcrystalline wax, carnauba natural wax, beeswax, whale wax and the like. Examples of the softening agent defined include phthalic acid diesters, paraffin oil, naphthene oil, liquid polybutene, liquid polyisoprene, and liquid polybutadiene. The following are already known as reactive hot melt adhesive compositions other than the above, air-drying hot melt adhesive compositions, electron beam curable hot melt adhesive compositions, UV curable hot melt adhesive compositions, 2 Liquid-based agent type reactive hot melt adhesive compositions and the like are also included in the reactive hot melt adhesive of the present invention.

The present invention is characterized in that the non-plywood wood board is coated with a hot melt adhesive during the coating process. In that case, the thermal characteristics of the adhesive itself should be fully understood and the thermal rigidity should be improved. It is important to determine the adhesive pressing condition depending on the joint condition, but under the pressurizing condition of approximately 5 to 30 kg / cm ² , the non-plywood wood board or the coating agent can be applied in either direction from 6 directions.
It is preferable to apply heat of 0 to 130 ° C. and press for about 0.01 to 120 seconds, preferably 1 to 60 seconds to bond the mutual materials. The method of applying the adhesive to the non-plywood wood board or the coating agent is not particularly limited, and roll coater coating, spray coating, tornado coating, bead coating, die coater coating or the like may be appropriately adopted.
Further, when the adhesive is applied or formed into a film and bonded, the processing method is not particularly limited, and a known method such as vacuum heating pressing, press pressing, hot roll press pressing may be adopted. The coating amount is approximately 20-300
A range of g / cm ² is suitable. In the case of a film, a suitable thickness is in the range of 20 to 500 μm. In the present invention, when the coating material is an embossed or one-sided wave-shaped coating material, it is important to select and use the bonding processing condition in which the change in shape of the coating material is taken into consideration in the above range. . In particular, when processing as a board for interior / exterior panel that is manufactured by coating with an olefin film, the bonding conditions should be sufficiently considered for scratches and discoloration of the exterior coating surface,
Clamping at a low temperature for a short time tends to be preferable. When the material obtained by the surface coating treatment method of the non-plywood wood board of the present invention is used as a control panel, the coating material is preferably a known mortar drying rate improving effect such as a surface-treated material that can be breathed by air. It is possible to obtain a more preferable control panel material by using a plastic coating material having an action. In the present invention, the thermosetting resin bath described in the processing method (E) means a bath containing the following thermosetting resin, and examples of the resin include the wood-based primary processing adhesive and Typical examples include an ultraviolet-curable coating composition represented by a polyvalent acrylate composition, a moisture-curable coating composition, and an air-curable dry coating composition.

[0011]

EXAMPLES Examples of the present invention will be shown below, but the present invention is not limited thereto, and “parts” and “%” described in the examples mean parts by weight or% by weight. As the hot melt adhesive described in the examples, the adhesives described in Reference Examples 1 to 3 were used. Reference Example 1 (Preparation of Hot Melt Adhesive A) 200 of trade name "Evaflex 410" as ethylene-vinyl acetate resin
Part, 250 parts of the same "Eva Flex 250", Mitsui Toatsu Chemicals "A" as atactic polypropylene resin
200 parts of "PP-H", a trade name "YS resin TO-115" which is a terpene-phenol resin as a tackifier.
250 parts, 50 of "Sazol wax"
Parts, 50 parts of liquid polybutene as a softening agent, and 3 parts of Irganox 1010 as an antiaging agent are melt mixed,
Hot melt resin composition A which is solid at room temperature, has a softening point temperature of 108 ° C., and a melt viscosity characteristic value of 10,000 / 180 ° C.
Got

Reference Example 2 (Preparation of Hot Melt Adhesive B) Crude MDI, which is a polynuclear body of diphenylmethane diisocyanate, and Nippon Soda Co., Ltd., a product of Nippon Soda Co., Ltd., which is a polybutadiene polyol as a polyol, have an OH group of: NC0 groups (in equivalent ratio) = 1: 2.2 were mixed, and the mixture was subjected to a reaction temperature of 95 ° C. for 5 hours in a nitrogen atmosphere to obtain a urethane prepolymer. Furthermore, for 1000 parts of the same series, the product name "Evaflex EEA" which is an ethylene-ethyl acrylate resin
A-703 ", 200 parts of trade name" Transparent rosin KE-311 "as a rosin ester derivative, 100 parts of natural carnauba wax, 0.02 parts of dibutyltin dilaurate are uniformly dissolved at 120 ° C and solid at room temperature. Hot melt adhesive B was obtained in the following description, which is a slightly tacky moisture-curable urethane hot melt adhesive composition having a slight initial finger touch tack. Reference Example 3 (Preparation of Hot Melt Adhesive C) Crude MDI which is a polynuclear body of diphenylmethane diisocyanate and Kuraray product “Kurapol P-2010” as a polyol, and a crystalline polyester diol having an average molecular weight of 1500 (dimethyl terephthalic acid and A 7: 3 mixture of (derived from 1,4-butanediol) = OH group: NC0 group (in equivalent ratio) =
Mix at 1: 2.3, in a nitrogen atmosphere, reaction temperature 95 ℃
Was carried out for 5 hours to obtain a urethane prepolymer. Furthermore, to 1000 parts of the same series, as a styrene-isoprene-styrene block copolymer resin, "Europrene T-1
90 "150 parts, dibutyltin dilaurate 0.0
In the following description, which is a moisture-curable urethane-based hot-melt adhesive composition that is solid at room temperature, 2 parts were simply mixed to obtain hot-melt adhesive C.

Example 1 One sheet of MDF board (thickness 10 mm, width 950 cm, length 2 m) stored in an atmosphere of 20 ° C./humidity of 50 ± 5% was used as a coating material and white with a thickness of 500 μm. Two opaque polypropylene films were prepared. MD
The hot melt adhesive A prepared in Reference Example 1 was applied to the upper and lower surfaces of F using a hot melt roll coater 180
It was previously coated so that the coating amount was 120 g / cm ^{2 on} average at ℃. After the coating is completed, the MDF material is completely cooled down to room temperature, and then the coating film is placed on the upper and lower surfaces of the MDF material and the hot plate temperature is set to 95 ° C with a pressing pressure of 12 kg / cm ² for 30 seconds. did. The resulting plate is 20 ° C
As a result of the peeling test of the coating material, the adhesive property that the wood fiber of MDF breaks at a rate of 50 to 70% was shown. Also, cut out exactly 2 pieces of the plate into a width of 30 cm and fill it with a filling width of 100 cm.
After forming a mm frame, the coated surface is J
Repeated filling and solidification of IS standard concrete mortar
When a suitability test for a control panel material in which a peeling cycle is performed, an attempt was made to obtain a result in which there was no problem in deformation of the plate or reduction in bending strength even after 10 times of repetition. When the frame was assembled, the frame was fixed using 3 inch nails, but no remarkable peeling of the nailed portion of the covering material was observed. Further, a panel in which the four corners of the separate plate were mechanically surrounded by U-shaped frames made of aluminum was adjusted, and the panel was left for an outdoor exposure test for one month in the summer, but no change was observed. Example 2 A sheet obtained in the same manner as in Example 1 except that the adhesive A was previously applied to the polypropylene film as the coating material in the same amount showed substantially the same characteristics as in Example 1. There was no peeling of the covering material in the impact resistance test of dropping a 20 cm square plate from a height of 1 m on a concrete floor at -10 ° C and 20 ° C, respectively.
It was a plate with excellent low-temperature adhesion properties.

Example 3 MDF (20 cm square size) similar to that shown in Example 1
Was immersed in a 3% maleic anhydride graft-modified isotactic polypropylene wax having a weight-average molecular weight of 2500 in advance at 155 ° C. in a wax bath for 3 minutes under a vacuum condition of -400 mHg and taken out, and the surface was smoothed through a doctor blade and a cooling roll. MD to secure the sex
MDF board with excess wax on the F surface removed (a)
And On the other hand, the hot-melt adhesive A shown in Reference Example 1 was applied to the plastic surface of an ethylene-vinyl acetate resin (containing approximately 10% as vinyl acetate) film having a width of 22 cm and a thickness of 120 μm, which had been subjected to aluminum metal deposition processing, as a coating material. It was coated with a hot melt roll coater at 145 ° C. and an average film pressure of 70 g / cm ² , cooled, wound, and then subjected to the following adhesion processing. The surface temperature of the MDF board (a) is set to around 130 ° C in the far infrared heating zone, and the cooling roll which is supplied from the winding free roll and set under the following conditions is provided on the upper surface of the MDF board (a). Through the press-bonding process. The conditions are 1st to 4th
Prepare a compaction device with the cooling rolls arranged in a row in a row, and supply the coating material in a form that covers the upper surface of the first cooling roll, and the MDF board (a) and the coating material come out and bond at the lower portion of the first roll. I set it so that I can do it. 1st to 4th
The surface temperature of the roll was set to 15 ° C. so that a linear pressure of 10 kg / cm was applied on average. The processing speed was 1 m / min, and after passing through the fourth roll, the coating material was cut into an MDF size to obtain a processed plate. The obtained plate was a plate in which almost no water absorption was observed in the 30 ° C. hot water immersion test. Further, when a silicone oil release agent-coated plate of the plate was subjected to a control panel suitability test similar to that in Example 1, no deformation or peeling was observed, and it was possible to use it repeatedly 6 times.

Example 4 The MDF was coated in the same manner as in Example 1 except that the hot melt adhesive B shown in Reference Example 2 was used in place of the adhesive A in Example 1 under the following adhesion conditions. As the bonding conditions, a pressing pressure of 5 kg / cm ^{2 and} a hot plate temperature of 80 ° C. were applied for 15 seconds. There was no problem with the initial adhesiveness, and the puncture occurrence rate of the coating agent was as low as 1% or less. The obtained plate after curing at room temperature for 7 days exhibited a material adhesion property of 10 to 15% in terms of MDF wood fiber material destruction rate in the peeling test of the coating agent, and almost good adhesion was obtained. 70 for heat-resistant adhesive creep deformation characteristics
It was found to clear the temperature sufficiently. Example 5 A processed plate was obtained in the same manner as in Example 4 except that the adhesive B was replaced with the hot melt adhesive C shown in Reference Example 3. The plate obtained after curing and curing at room temperature for 7 days was 20 to 3 in MDF wood fiber material breaking rate in the peeling test of the coating agent.
It exhibited a material breakage adhesive property of 0% and obtained good adhesiveness. It was found that the heat-resistant adhesive creep deformation characteristics were sufficiently clear at 75 ° C. In addition, when the panel was subjected to a panel suitability test similar to that in Example 1, no deformation or peeling was observed, and it was possible to use it repeatedly more than 9 times.

Comparative Example 1 Using the same unprocessed MDF board as used in Example 1, the same control panel suitability test as in Example 1 was conducted.
Deformation due to water absorption was observed, and the concrete filling width was distorted during the second repeated use stage, and MD during peeling work etc.
There was a problem that many F-board surface peelings were observed. In the water absorption test of the board itself, it showed high water absorption, swelling and deformation, and a significant decrease in bending strength was observed. Comparative Example 2 In place of the hot melt adhesive A in Example 1, the main component and curing agent of the two-component main component type epoxy adhesive “Mitsui Toatsu Chemicals: Struct Bond 1202F” having a gel time of 60 minutes at room temperature were used. Prepare, mix 1: 1 and immediately apply 120 g on one surface of MDF board (20 cm square) by brush coating method.
/ Cm ² average was applied. An untreated polypropylene film of the same size with a thickness of 1 mm was placed, and adhesion was tried for 1 minute under a pressure plate pressure of 1 Kg / cm ^{2 and} a heating plate condition of 100 ° C. It was difficult to secure the adhesive layer because it was squeezed out and MDF was seeped. Therefore, under the above-mentioned conditions, it was judged that the adhesion of the covering material was impossible, and the puncture occurrence rate was 100%. Further, it was necessary to continue the pressing and fixing for at least 3 hours in order to fix and adhere the covering material under the same press conditions at room temperature, and for 12 hours or more to reduce the puncture occurrence rate to 1% or less.
Further, the plate obtained by curing at room temperature for 1 day showed interfacial peeling of the coating material in the peeling test of the coating material, and the MDF was not observed to be broken, and the adhesiveness of the coating material was poor.

Comparative Example 3 A plate obtained in the same manner as in Comparative Example 2 except that a polypropylene film having the surface subjected to corona discharge treatment was used as a covering material (15 hours fixed adhesion processing and further 1 day curing) was carried out. Adhesion reliability was good in the atmosphere from room temperature to 60 ° C, but at low temperatures in the atmosphere of 0 ° C or lower, the 20 cm square plate was dropped from the height of 1 m on the concrete floor in the impact resistance test to remove the interface of the coating material. Was observed and there was a problem in the low temperature adhesion property of the plate. The panel suitability test similar to that described in Example 1 using the plate could be repeatedly used 6 times or more, but it was a processing method having a problem in productivity. Comparative Example 4 A 30 cm square piece of MDF board having a thickness of 12 mm was coated on one surface thereof with an ultraviolet-curable coating composition of Mitsui Toatsu Chemical Co., Inc. “Oresta RA1353” to a coating amount of 120 g / cm ^2. Immediately after that, 80 watts / 3 lights U
The coating film was cured and dried by passing through the V irradiation device twice at 5 m / min. The obtained plate has an apparent surface hardness of H ~ in pencil hardness.
Although a coating film showing 2H was obtained, there was considerable resin infiltration inside the surface of the MDF board, and the resin infiltrated into the deep portion of 0.35 mm or more was not cured at all. Therefore, it was found that whitening and floating of the coating film were observed in a 1-hour water resistance test carried out with a gauze containing saturated water, and the water resistance and adhesion durability were lacking.

Comparative Example 5 In Example 1, instead of the hot melt adhesive A, a styrene-isoprene-styrene block showing a strong tackiness at room temperature (adhesion activation temperature is room temperature) and a softening point temperature of 85 ° C. 25 parts of "Europrene sol T-190" as a resin,
45 parts of "ESCOLETS 5300" which is a hydrogenated dicyclopentadiene resin as a tackifier, and 2 of naphthene oil
A plate obtained in the same manner as described below except that the hot-melt adhesive composition D consisting of 5 parts and 5 parts of polyethylene wax was used and the pressing temperature was room temperature was covered because the adhesive had strong adhesiveness at room temperature. Although there is no peeling of the material, if left in an atmosphere over 40 ° C, the adhesive will show insufficient creep resistance due to insufficient heat-resistant cohesive strength, and it will be impractical to laminate with a hot-melt adhesive having a low softening point. There was found. Comparative Example 6 A plate obtained in the same manner as in Example 1 except that a soft vinyl chloride resin film having the same thickness was used as the coating material, had a cohesive force of the adhesive reduced when left in an atmosphere of 60 ° C. for 3 days. Was observed, and creep exfoliation of the coating material was exhibited due to migration of dioctyl phthalate, which is a plasticizer for vinyl chloride resin. Vinyl chloride resin was not suitable as a coating material.

[0019]

EFFECTS OF THE INVENTION From Comparative Example 1, the MDF board itself has very poor water resistance. Further, from Comparative Examples 2 and 3, the MDF processed board obtained by film processing through an epoxy adhesive which is a typical thermosetting adhesive has a problem in productivity and has low temperature adhesion reliability and resistance. It is clear that impact adhesion reliability is lacking. Further, in Comparative Example 4, water resistance cannot be satisfied by surface modification with a pollution-free coating composition. Further, the composition having a low reactivation temperature of the hot melt adhesive as in the example of Comparative Example 5 has a problem of lacking heat resistance and practicality. In Comparative Example 6, a vinyl chloride resin as a coating material generally has a problem of migration of a plastic material, and it is judged that a processing method using a hot melt adhesive is unsuitable. On the other hand, as is clear from Examples 1 to 5, the processing method (A) proposed by the present invention is carried out via a hot melt adhesive mainly composed of a polyolefin resin as a polyolefin resin or a specified reactive hot melt adhesive. It is clear that when any of the processing methods shown in () to (F) is adopted, it is possible to obtain a processed material having excellent water resistance, heat and cold resistance, and adhesive durability characteristics of the coating material. is there. Further, the surface coating material of the non-plywood wood board obtained by the processing method of the present invention can be applied for concrete formwork and interior / exterior panel. The present invention further contributes to the protection of wood resources mentioned as one of its gist, further improving the functionality of non-plywood wood boards made from wood chips or wood fibers prepared from so-called recycled / recovered wood. It is an excellent technology that can achieve high productivity and is practical.

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[Procedure amendment]

[Submission date] January 8, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

The present invention is characterized in that the non-plywood wood board is coated with a hot melt adhesive during the coating process. In that case, the thermal characteristics of the adhesive itself should be fully understood and the thermal rigidity should be improved. It is important to determine the adhesive pressing condition depending on the joint condition, but under the pressurizing condition of approximately 5 to 30 kg / cm ² , the non-plywood wood board or the coating agent can be applied in either direction from 6 directions.
It is preferable to apply heat of 0 to 130 ° C. and press for about 0.01 to 120 seconds, preferably 1 to 60 seconds to bond the mutual materials. The method of applying the adhesive to the non-plywood wood board or the coating agent is not particularly limited, and roll coater coating, spray coating, tornado coating, bead coating, die coater coating or the like may be appropriately adopted.
Further, when the adhesive is applied or formed into a film and bonded, the processing method is not particularly limited, and a known method such as vacuum heating pressing, press pressing, hot roll press pressing may be adopted. The coating amount is approximately 20-300
A range of g / m ² is suitable. In the case of a film, a suitable thickness is in the range of 20 to 500 μm. In the present invention, when the coating material is an embossed or one-sided wave-shaped coating material, it is important to select and use the bonding processing condition in which the change in shape of the coating material is taken into consideration in the above range. . In particular, when processing as a board for interior / exterior panel that is manufactured by coating with an olefin film, the bonding conditions should be sufficiently considered for scratches and discoloration of the exterior coating surface,
Clamping at a low temperature for a short time tends to be preferable. When the material obtained by the surface coating treatment method of the non-plywood wood board of the present invention is used as a control panel, the coating material is preferably a known mortar drying rate improving effect such as a surface-treated material that can be breathed by air. It is possible to obtain a more preferable control panel material by using a plastic coating material having an action. In the present invention, the thermosetting resin bath described in the processing method (E) means a bath containing the following thermosetting resin, and examples of the resin include the wood-based primary processing adhesive and Typical examples include an ultraviolet-curable coating composition represented by a polyvalent acrylate composition, a moisture-curable coating composition, and an air-curable dry coating composition.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

Example 1 One sheet of MDF board (thickness 10 mm, width 950 cm, length 2 m) stored in an atmosphere of 20 ° C./humidity of 50 ± 5% was used as a coating material and white with a thickness of 500 μm. Two opaque polypropylene films were prepared. MD
The hot melt adhesive A prepared in Reference Example 1 was applied to the upper and lower surfaces of F using a hot melt roll coater 180
It was previously coated so that the coating amount was 120 ° C. and the average was 120 g / m ² . After the coating is completed, the MDF material is completely cooled down to room temperature, and then the coating film is placed on the upper and lower surfaces of the MDF material and the hot plate temperature is set to 95 ° C with a pressing pressure of 12 kg / cm ² for 30 seconds. did. The resulting plate is 20 ° C
As a result of the peeling test of the coating material, the adhesive property that the wood fiber of MDF breaks at a rate of 50 to 70% was shown. Also, cut out exactly 2 pieces of the plate into a width of 30 cm and fill it with a filling width of 100 cm.
After forming a mm frame, the coated surface is J
Repeated filling and solidification of IS standard concrete mortar
When a suitability test for a control panel material in which a peeling cycle is performed, an attempt was made to obtain a result in which there was no problem in deformation of the plate or reduction in bending strength even after 10 times of repetition. When the frame was assembled, the frame was fixed using 3 inch nails, but no remarkable peeling of the nailed portion of the covering material was observed. Further, a panel in which the four corners of the separate plate were mechanically surrounded by U-shaped frames made of aluminum was adjusted, and the panel was left for an outdoor exposure test for one month in the summer, but no change was observed. Example 2 A sheet obtained in the same manner as in Example 1 except that the adhesive A was previously applied to the polypropylene film as the coating material in the same amount showed substantially the same characteristics as in Example 1. There was no peeling of the covering material in the impact resistance test of dropping a 20 cm square plate from a height of 1 m on a concrete floor at -10 ° C and 20 ° C, respectively.
It was a plate with excellent low-temperature adhesion properties.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

Example 3 MDF (20 cm square size) similar to that shown in Example 1
Was immersed in a 3% maleic anhydride graft-modified isotactic polypropylene wax having a weight-average molecular weight of 2500 in advance at 155 ° C. in a wax bath for 3 minutes under a vacuum condition of -400 mHg and taken out, and the surface was smoothed through a doctor blade and a cooling roll. MD to secure the sex
MDF board with excess wax on the F surface removed (a)
And On the other hand, the hot-melt adhesive A shown in Reference Example 1 was applied to the plastic surface of an ethylene-vinyl acetate resin (containing approximately 10% as vinyl acetate) film having a width of 22 cm and a thickness of 120 μm, which had been vapor-deposited with aluminum metal, as a coating material. It was coated with a hot melt roll coater at 145 ° C. and an average film pressure of 70 g / m ² , cooled and wound, and then subjected to the following adhesion processing. The surface temperature of the MDF board (a) is set to around 130 ° C in the far infrared heating zone, and the cooling roll which is supplied from the winding free roll and set under the following conditions is provided on the upper surface of the MDF board (a). Through the press-bonding process. The conditions are 1st to 4th
Prepare a compaction device with the cooling rolls arranged in a row in a row, and supply the coating material in a form that covers the upper surface of the first cooling roll, and the MDF board (a) and the coating material come out and bond at the lower portion of the first roll. I set it so that I can do it. 1st to 4th
The surface temperature of the roll was set to 15 ° C. so that a linear pressure of 10 kg / cm was applied on average. The processing speed was 1 m / min, and after passing through the fourth roll, the coating material was cut into an MDF size to obtain a processed plate. The obtained plate was a plate in which almost no water absorption was observed in the 30 ° C. hot water immersion test. Further, when a silicone oil release agent-coated plate of the plate was subjected to a control panel suitability test similar to that in Example 1, no deformation or peeling was observed, and it was possible to use it repeatedly 6 times.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

Comparative Example 1 Using the same unprocessed MDF board as used in Example 1, the same control panel suitability test as in Example 1 was conducted.
Deformation due to water absorption was observed, and the concrete filling width was distorted during the second repeated use stage, and MD during peeling work etc.
There was a problem that many F-board surface peelings were observed. In the water absorption test of the board itself, it showed high water absorption, swelling and deformation, and a significant decrease in bending strength was observed. Comparative Example 2 In place of the hot melt adhesive A in Example 1, the main component and curing agent of the two-component main component type epoxy adhesive “Mitsui Toatsu Chemicals: Struct Bond 1202F” having a gel time of 60 minutes at room temperature were used. Prepare, mix 1: 1 and immediately apply 120 g on one surface of MDF board (20 cm square) by brush coating method.
/ M ² average was applied. An untreated polypropylene film of the same size with a thickness of 1 mm was placed, and adhesion was tried for 1 minute under a pressure plate pressure of 1 Kg / cm ^{2 and} a heating plate condition of 100 ° C. It was difficult to secure the adhesive layer because it was squeezed out and MDF was seeped. Therefore, under the above-mentioned conditions, it was judged that the adhesion of the covering material was impossible, and the puncture occurrence rate was 100%. Further, it was necessary to continue the pressing and fixing for at least 3 hours in order to fix and adhere the covering material under the same press conditions at room temperature, and for 12 hours or more to reduce the puncture occurrence rate to 1% or less.
Further, the plate obtained by curing at room temperature for 1 day showed interfacial peeling of the coating material in the peeling test of the coating material, and the MDF was not observed to be broken, and the adhesiveness of the coating material was poor.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

Comparative Example 3 A plate obtained in the same manner as in Comparative Example 2 except that a polypropylene film having the surface subjected to corona discharge treatment was used as a covering material (15 hours fixed adhesion processing and further 1 day curing) was carried out. Adhesion reliability was good in the atmosphere from room temperature to 60 ° C, but at low temperatures in the atmosphere of 0 ° C or lower, the 20 cm square plate was dropped from the height of 1 m on the concrete floor in the impact resistance test to remove the interface of the coating material. Was observed and there was a problem in the low temperature adhesion property of the plate. The panel suitability test similar to that described in Example 1 using the plate could be repeatedly used 6 times or more, but it was a processing method having a problem in productivity. Comparative Example 4 A 30 cm square piece of MDF board having a thickness of 12 mm was coated on one surface thereof with an ultraviolet-curable coating composition of Mitsui Toatsu Chemical Co., Inc. "Orestar RA1353" so that the coating amount was 120 g / m ^2. Immediately after that, 80 watts / 3 lights U
The coating film was cured and dried by passing through the V irradiation device twice at 5 m / min. The obtained plate has an apparent surface hardness of H ~ in pencil hardness.
Although a coating film showing 2H was obtained, there was considerable resin infiltration inside the surface of the MDF board, and the resin infiltrated into the deep portion of 0.35 mm or more was not cured at all. Therefore, it was found that whitening and floating of the coating film were observed in a 1-hour water resistance test carried out with a gauze containing saturated water, and the water resistance and adhesion durability were lacking.

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location B32B 21/08 E04G 9/05 7040-2E

Claims (8)

[Claims] 1. A plastic selected from polypropylene, polyethylene, polyethylene terephthalate, acrylic, polycarbonate, acrylonitrile-butadiene-styrene resin, ethylene-vinyl acetate resin, ethylene-ethyl acrylate resin, and ionomer resin on the surface of non-plywood wood board. A surface coating treatment method for a non-plywood wood board, characterized by being obtained by processing any one of the above-mentioned metal laminate materials or one of these laminated papers with a coating material by any of the following methods. A) A non-plywood wood board is heat-melted and vacuum impregnated with a semi-solid or solid hot-melt adhesive at room temperature, and then the covering material is pressure-bonded. B) A non-plywood wood board and / or a covering material is directly melt-coated with a semi-solid or solid hot-melt adhesive at room temperature, and then both members are pressure-bonded. C) A semi-solid or solid hot-melt adhesive at room temperature is previously processed into a single film, and the film-like adhesive is sandwiched between a non-plywood wood board and a covering material for heat compression bonding. D) The non-plywood wood board is previously melted at a melting point of 80 ° C or higher, 15
Semi-solid or solid at room temperature after surface-wax impregnation treatment, which is either passing through a hot-melting bath of wax at 0 ° C. or lower to impregnate the wax, or passing through a wax emulsion bath and then post-heating and drying to impregnate the wax. The coating material is coated and adhered via the hot melt adhesive. E) The non-plywood wood board is passed through a thermosetting resin bath in advance to impregnate the thermosetting resin, the resin is dried and cured, and then the coating material is applied through a semi-solid or solid hot melt adhesive at room temperature. Glue. F) Non-plywood wood board is preliminarily subjected to humidity control or forced drying,
The covering material is adhered by any of the above methods A) to E). 2. The surface coating treatment method for a non-plywood wood board according to claim 1, wherein the non-plywood wood board is a medium specific gravity wood fiber reinforced board. 3. The hot-melt adhesive as an initial physical property, which is either tacky or non-tacky at room temperature, and has an adhesive heat activation temperature in the range of 70 to 130 ° C. A method of processing a surface coating of a non-plywood wood board as described. 4. A hot melt adhesive containing at least 5% by weight of an amorphous polypropylene resin, and at least one kind selected from ethylene-vinyl acetate resin, ethylene-ethyl acrylate resin, styrene block copolymer resin and ionomer resin. The composite resin containing a base resin is contained.
Alternatively, the surface coating treatment method of the non-plywood wood board according to any one of 3 above. 5. The surface coating treatment method for a non-plywood wood board according to claim 1, wherein the hot melt adhesive is a reactive curable hot melt adhesive. 6. The non-plywood of any one of claims 1 to 5, wherein only one surface of the non-plywood wood board is used as a coating material, and one kind of polypropylene, polyethylene and polycarbonate is laminated and bonded. Surface coating treatment method for wood board. 7. The heating and pressure-bonding processing means for pressure-bonding the covering material is any one of high-frequency heating, hot plate, heat roll, ultrasonic heating, vacuum heating and the like. 7. A surface coating treatment method for a non-plywood wood board according to any one of 1 to 6. 8. A non-plywood board, characterized in that the surface-coated processed material of the non-plywood wood board obtained by the method according to any one of claims 1 to 7 is used as a formwork material for concrete driving or as an interior / exterior panel. Applications of surface coating processing materials for wood boards.