KR20010039567A - Undercoat curing method - Google Patents

Abstract

In painting wood materials, the properties vary depending on the type of wood and the method of producing the wood materials, so the paint must be prepared in consideration of the absorption of the paint, the surface irregularities, and the like. In particular, in wood with a large conduit, the primary coating material of the conventional two-component polyurethane resin does not have sufficient hardness because the conduit cannot be sufficiently sealed and a smooth coating film cannot be formed. As it is, it cannot be used for materials, such as the top board of a table which requires hardness.

Therefore, the present invention, after coating the coating material of the organic peroxide, metal carboxylic acid salt, photopolymerization initiator and optionally unsaturated polyester resin containing an ethylenically unsaturated monomer on the wood material, the coating film is internally hardened at room temperature or heated state. It is a method of curing a primary coating film of an unsaturated polyester resin which is then surface cured by irradiating active energy rays.

Description

Curing method of primary coating film {UNDERCOAT CURING METHOD}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hardening method of a pristine coating film of unsaturated polyester resin in a pristine coating film of wooden materials. In addition, the present invention relates to a curing method for improving the sealing property and obtaining a smooth coating film of an unsaturated polyester resin with little thinning (shrinkage of the coating film due to polymerization promotion after coating).

Paint is a construction material which forms a coating film on the surface of an article, and there are many kinds, and it is used according to each purpose. In other words, the surface of wood is generally coated with lacquer, natural resin varnish, water-based paint, oil-based paint, cellulose paint, synthetic resin paint, etc. It is used. However, wood has various properties depending on its ring structure, cell structure, and spatial structure. Therefore, depending on the application, it is often required to increase the hardness of the wood and to prevent scratches. Therefore, the method is the wood-plastic-combination (WPC) of wood, which has plastic properties of wood, styrene, methyl methacrylate (methyl metha crylate) By injecting a single liquid or a mixture of vinyl monomers such as vinyl acetate and acrylonitrile, unsaturated polyesters and acrylic oligomers, and polymerizing these resins. The surface has a unique surface gloss without coating, gives a sense of quality depending on the coloring, and improves the wear resistance by increasing the hardness. However, it is necessary to polymerize the injected resin, so that a special apparatus is required and manufacturing costs are high. In addition, in painting wood materials, it is necessary to coat a primary paint for sealing the conduit, preventing thinning of the coating film, and adhesion to the wood materials. Therefore, although many primary coatings of two-component polyurethane resins have been used, they were not satisfactory in the conduit sealing property, the prevention of thinning of the coating film, and the adhesion to the wood materials, and were not sufficient as a method of increasing the hardness of the wood or preventing scratches.

Conventionally, novolak-type unsaturated polyester resins containing a polyhydric alcohol aryl ether component, dicyclopentadiene, or the like have properties of drying in the air and thus have a gloss or feel. Since it can be finished nicely and cleanly, it has been used for general paints, especially woodwork paints, sealing materials, adhesives, moldings and the like. In addition, paints of unsaturated polyester resins are often used as chaebol paints in applications such as building materials and furniture, and in this case, polyurethane resin paints have been mainly used as primary paints.

If the material to be coated is wood, its properties vary depending on the type of wood and the method of producing the wood and the absorption of the paint and irregularities on the surface must be taken into account in the preparation of the paint. Particularly in large ducts and oak trees with large conduits, conventional primers of two-component polyurethane resins cannot seal the conduits sufficiently, a smooth coating film cannot be obtained, and thinning of the coating film has increased. In addition, soft paints such as paulownia, poplar, cedar, and radial pine are not enough hardness as the primary paint of conventional two-component polyurethane resins, so they may be scratched, and the tables that require hardness, especially furniture, building materials, etc. It could not be used as a material such as a top plate.

That is, after coating a two-component polyurethane resin-based priming paint on a wood material, a urethane-based chaebol paint or an unsaturated polyester resin chaebol paint is applied. Even after coating as described above, the soft wood material did not harden. Moreover, even after hardening, thinning generate | occur | produced many times and the smooth coating film was not obtained. Also, in wood materials with large conduits, the conduit could not be sealed by coating the primary coating of polyurethane resin once, and even when the conglomerate coating of unsaturated polyester resin was applied, it was replaced with air contained in the wood, so that air bubbles sometimes In many cases, a smooth coating film could not be obtained. Therefore, many studies have been made on the improvement of surface hardness and the improvement of the smooth coating film. However, in the case of the initial coating, the solution to the treatment method of the coating film, which is neither cost nor practical and requires no special apparatus, has become a problem.

As a result of intensive research by the present inventors, the problem has been successfully solved by using a curing method of a coating film of a new unsaturated polyester resin. In other words, the present invention is an unsaturated poly-containing organic peroxide, a carboxylic acid metal salt (carboxyl salt) and a photopolymerization initiator (photopolymerization initiator) in the initial coating of wood materials After coating the initial coating of the ester resin on the wood, the coating film is internally hardened at room temperature or heated, and then surface hardened by irradiating an active energy ray. As a hardening method of the primary coating film of the unsaturated polyester resin characterized by the above, it is preferable that the carboxylic acid metal salt is a higher fatty acid cobalt salt, and especially cobalt octenoate. In addition, the average water content of the wood material is 3 to 20% by weight, and the dry density is preferably 0.30 to 1.00 g / cm ³ , and the active energy ray is preferably ultraviolet light.

In addition, the present invention, in the primary paint of the wood material, after coating the wood paint with a primary paint of an unsaturated polyester resin containing an organic peroxide, a carboxylic acid metal salt, a photopolymerization initiator and an ethylenically unsaturated monomer As a method for curing a primary coating film of an unsaturated polyester resin, the coating film is internally cured at room temperature or in a heated state and then irradiated with an active energy ray, and the metal carboxylic acid salt is preferably a higher fatty acid cobalt salt. It is preferable that it is cobalt octenate. In addition, it is preferable to use a vinyl monomer and a (meth) acrylic monomer as an ethylenically unsaturated monomer, and it is preferable to use 2-hydroxyethyl methacrylate especially as a (meth) acrylic monomer. In addition, the average moisture content of the wood materials is 3 to 20% by weight, and the dry density is preferably 0.30 to 1.00 g / cm ³ and the active energy ray is preferably ultraviolet light.

(Example)

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

The unsaturated polyester resin used in the present invention is not particularly limited, and a polycondensation product of an unsaturated polybasic acid (saturated polybasic acid is used in combination) and a polyhydric alcohol (heavy compound) )to be. Examples of the unsaturated polybasic acid include maleic anhydride, maleic acid, maleic acid, fumaric acid, itaconic anhydride, and itaconic acid, and as saturated polybasic acid, phthalic anhydride ( phthalic anhydride, phthalic acid, terephthalic acid, isophthalic acid, adipic acid, tetrahydrophthalic anhydride, 3-methyltetrahydro phthalic anhydride (3-methyl tetrahydrophthalic anhydride, trimellitic acid, trimellitic anhydride, pyromellitic acid, pyromellitic anhydride, 6-methyl-4-cyclohexene-1,2 , 3-tricarboxylic acid anhydride (6-methyl-4-cyclohexene-1,2,3-tricarboxylic anhydride) and the like.

In addition, examples of the polyhydric alcohol that may be polycondensed with the unsaturated polybasic acid include ethylene glycol, propylene glycol, propylene glycol, diethylene glycol, triethylene glycol, and dipropylene glycol. Dipropylene glycol, hydrogenated bisphenol A, bisphenol A dioxypropoxy ether, bisphenol A dipolyoxypropoxy ether, bisphenol Bisphenol A dioxyethoxy ether, bisphenol A dipolyoxyethoxy ether, 1,9-nonanediol, polypropylene glycol, polyethylene glycol (polyethyleneglycol), polytetramethylene glycol, 1,3-butylene glycol (1,3-butylene glycol), 2,3-butylene article Alcohol (2,3-butylene glycol), 1,4-butylene glycol (1,4-butylene glycol), 1,6-hexanediol (1,6-hexanediol), 2-ethyl-1,3-hexane Diol (2-ethyl-1,3-hexanediol), 2,2,4-trimethyl-1,3-pentanediol (2,2,4-trimethyl-1,3-pentanediol), neopentyl glycol ), Trimethylol ethane, trimethylol propane, glycerin, glycerine, pentae rythritol, cyclohexane dimethanol, and the like.

In the present invention, in order to have the property of drying in the air, a cyclopentadiene-based unit, a dicyclopentadiene-based unit, and a polyhydric alcohol aryl ether unit are used as structural units of the unsaturated polyester resin. It is preferable to contain at least one unit of (多 價 alcohol allyl ether 單位), and the cyclopentadiene-based units and dicyclopentadiene-based units include cyclopentadiene, dicyclopentadiene or derivatives thereof C), and examples of the derivative include tricyclodecenyl maleate, tricyclodecenyl fumarate, tricyclodecenyl adipate and tricyclodecenyl adipate, and tricyclodecenyl phthalate. tricyclodecenyl phthalate), isophthalic acid tricyclodecenyl (t ricyclodecenyl isophthalate, tricyclodecenyl trimellitate, ethylene glycol tricyclodecenyl ether, diethylene glycol tricyclodecenyl ether, propylene glycol Propylene glycol tricyclodecenyl ether, 1,4-butanediol tricyclodecenyl ether, 1,6-hexanediol tricyclodecenyl ether (1,6-hexanediol tricyclodecenyl ether), neopentyl glycol tricyclodecenyl ether, glycerin tricyclodecenyl ether, trimethylol propane tricyclodecenyl ether, hydroxylated dish For example, clopentadiene (hydroxylated dicyclopentadiene) The.

More specifically, as the polyhydric alcohol aryl ether unit, pentaerythritol triallyl ether, trimethylol propane diallyl ether, glycerin monoallyl ether, trimethylol ethanediaryl Examples thereof include trimethylol ethanediallyl ether and glycerin diallyl ether, all of which are ethers containing at least one hydroxyl group in a molecule.

The organic peroxide, the carboxylic acid metal salt, the photoinitiator, and the ethylenically unsaturated monomer are mix | blended with the coating material of the unsaturated polyester resin used by this invention. Organic peroxides include methyl ethyl ketone peroxide, cyclohexanone peroxide, cumene hydroperoxide, benzoyl peroxide and dicumyl peroxide. and t-butyl perbenzoate. Examples of the carboxylic acid metal salts include higher fatty acid cobalt salts and higher fatty acid manganese salts. Examples of the higher fatty acid cobalt salts include octal acid cobalt and cobalt naphthenate, and higher fatty acid manganese salts. And manganese naphthenate, and the like, and methyl ethyl ketone peroxide and cobalt octenate are very preferred.

The photopolymerization initiator is not particularly limited as long as it generates radicals by the action of light. Specifically, 4-phenoxydichloroacetophenone and 4-t-butyl-dichloroacetophenone (4- t-butyl-dichloroacetophenone), diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1- (4-isopropylenephenyl) -2-hydroxy-2-methylpropane-1-one (1- (4-isopropylenephenyl) -2-hydroxy-2-methylpropan-1-one), 1- (4- Dodecylphenyl) -2-hydroxy-2-methylpropane-1-one (1- (4-dodecylphenyl) -2-hydroxy-2-methylpropan-1-one), 4- (2-hydroxyethoxy) -Phenyl (2-hydroxy-2-propyl) ketone (4- (2-hydroxyethoxy) -phenyl (2-hydroxy-2-propyl) ketone), 1-hydroxycyclohexyl phenyl ketone , 2-hydroxypropyl phenyl ketone, 2-hydroxy 2-hydroxypropyl-4-isobutyl phenyl ketone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropane-1 (2-methyl-1- [4 (methylthio) phenyl] -2-morpholinopropane-1), benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether ), Benzoin isobutyl ether, benzyl dimethyl ketal, benzophenone, benzoyl benzoate, methyl benzoyl benzoate, 4-phenylbenzophenone ( 4-phenyl benzophenone, hydroxybenzophenone, 4-benzoyl-4'-methyldiphenyl sulfide, 3,3'-dimethyl-4-methoxybenzo Phenone (3,3'-dimethyl-4-methoxy benzophenone), thioxanthone, 2-chlorothioxoneone, 2-methyl thioxone anthone, 2,4-dimethyl thioxanthone, isopropyl thioxanthone, camphor quinone, dibenzosuberone, 2-ethylanthra 2-ethyl anthraquin one, 4 ', 4' '-diethyl isophthalophenone, 3,3', 4,4'-tetra (t-butylper Oxycarbonyl) benzophenone (3,3 ', 4,4'-tetra (t-butylperoxycarbonyl) benzophe none), α-acyloxime ester, acyl phos phine oxide, Methyl phenyl glyoxylate, 9,10-phenanthrene quinone, 4- (2-hydroxyethoxy) phenyl- (2-hydroxy-2-propyl) ketone ( 4- (2-hydroxyethoxy) phenyl- (2-hydroxy-2-propyl) ketone) and the like. Among these photopolymerization initiators, benzyl dimethyl ketal, 1-hydroxycyclohexyl phenyl ketone, benzoyl isopropyl ether, 4- (2-hydroxyethoxy) -Phenyl (2-hydroxy-2-propyl) ketone (4- (2-hydroxyethoxy) -phenyl (2-hydroxy-2-propyl) ketone), 2-hydroxy-2-methyl-1-phenylpropane-1 -One (2-hydroxy-2-methyl-1-pheny lpropan-1-one) can be used as appropriate.

Examples of auxiliaries for the photopolymerization initiator include triethanol amine, triisopropanol amine, 4,4'-dimethylaminobenzophenone (miher ketone) (4,4'-dimethylaminobenzophenone; michler's ketone), 4,4'-diethylaminobenzophenone (2-dimethylaminoethyl benzoate), 4-dimethylamino benzoic acid (ethyl 4-dimethyl aminobenzoate), 4-dimethylamino Benzoic acid (n-butoxy) ethyl (n-butoxy) ethyl 4-dimethyl aminobenzoate, 4-dimethylamino isoamyl 4-dimethyl aminobenzoate, 4-dimethylamino benzoic acid 2-ethylhexyl 4-dimethyl aminobenzoate), 2,4-diethyl thioxanthone, 2,4-diisopropyl thioxanthone (2,4-diisopro pyl thioxanthone) and the like can also be used in combination.

Examples of the ethylenically unsaturated monomers include vinyl monomers, monomers containing methacryloyl groups and acryl groups, and acryloyl monomers, and vinyl monomers include styrene monomers and vinyl toluene ( vinyl toluene), vinyl acetate, and the like. As the (meth) acrylic monomer, morpholine acrylate, phenoxydiethylene glycol monoacrylate, tripropylene glycol diacrylate, dipropylene glycol diacrylate (dipropylene glycol diacrylate), aryl methacrylate (allyl methacrylate), glycidyl acrylate (glycidyl acrylate), glycidyl methacrylate (glycidyl methacrylate), 2-methoxyethyl acrylate (2-methoxyethyl acrylate), Phenoxyethyl acrylate, 2-hydroxyethyl methacrylate, methoxytriethylene glycol acrylate, methoxytriethylene glycol methacrylate, 2- 2-methoxyethyl methacrylate, phenoxyethyl methacrylate Phenoxyethyl methacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, and the like. Among these ethylenically unsaturated monomers, methacryl-based monomers are most suitably used, and 2-hydroxyethyl methacrylate is particularly effective.

Although it does not specifically limit about the compounding ratio of a chemical | medical agent, The compounding weight ratio (it shows a weight part with respect to 100 weight part of unsaturated polyester resin (solid content)) for obtaining the effect of this invention efficiently is as follows. 0.5-5 parts by weight of organic peroxide, preferably 1-3 parts by weight, 0.3-1.0 parts by weight of organic carboxylic acid metal salt, preferably 0.4-0.6 parts by weight, 0.5-5 parts by weight of photopolymerization initiator, preferably 1.5-3 weight part and ethylenically unsaturated monomer are selected in the range of 10-40 weight part, Preferably it is 20-30 weight part. If the amount is less than the lower limit of the above range, the drying property is poor and the curability is slow. On the contrary, if the amount is high, the usable time is shortened and workability is lowered.

After coating the wood-based primary coating material of the unsaturated polyester resin produced by the above formulation, first, internal curing of the coating film is carried out at normal temperature or in a heated state. About 50-200 micrometers is practical for the thickness of a coating film, 20-40 degreeC of curing temperature, and 30-90 minutes of curing time are suitable. The active energy ray is then irradiated. Irradiation is not specifically limited as long as it is a method of activating a photoinitiator, Light rays of an ultraviolet-ray wavelength range, an ultraviolet-ray wavelength range, a near-ultraviolet wavelength range, and an infrared-wavelength range Radiation, such as X-rays and γ-rays, and a method of irradiating and curing active energy rays such as electron beams, quantum lines, neutron beams, and neutron beams. In terms of availability and price, the curing method by ultraviolet irradiation is advantageous. The ultraviolet light is mainly light in the wavelength range of 150 to 450 nm, and is a high pressure mercury lamp and a metal halide lamp. The method of irradiation using a lamp, a xenon lamp, a chemical lamp, etc. can be mentioned. The conglomerate paint is coated on the primary coating film of the polyester resin of the present invention thus produced. Moreover, you may coat a polyurethane type primary paint under the unsaturated polyester type primary coating film.

Examples of the wood material for carrying out the present invention include wood boards such as wood, plywood, fiberboard, particle board, wafer board, and laminated boards. And paperback plywood, paperback fibreboard, transfer printing plywood, transfer printing fibreboard, and the like. In particular, if the average moisture content of the wood materials is adjusted to ³ to 20% by weight and the dry density is adjusted to 0.30 to 1.00 g / cm ³ , the warping, warping and cracking of the wood materials are prevented during curing and the deformation thereof can be suppressed. do. Wood is specifically cypress, cypress, hawthorn, pine, poplar, paulownia, pine, cedar, kalopanax, white birch, beech, oak, agadith, oak, Merukushimatsu, radial pine, apitong, light red meranti, rubber tree, lamine, niyato, ebony, white sandalwood, rosewood, teak, etc. For example.

The method of the present invention can be practiced in various technical fields, and can be widely used in various coating agents (ie, paints), putty and sealing agents, etc., and the range of not impairing the effects of the present invention depending on the use thereof. Defoamer, flame retardant, antistatic agent, plasticizer, filler (mica, fine silica, perlite, etc.) , Leveling agents (silicone, cellulose acetate butyrate, surfactants, etc.), stabilizers, anti-sagging agents (hydrogenated castors) Oil (water castor oil), fine particle silicic anhydride (microparticulate silicic anhydride, etc.), a moisture remover (fine powder silica etc.), etc. can also be mix | blended.

As a diluent, ethyl acetate, butyl acetate, toluene, xylene, butanol, acetone, methyl isobutyl ketone, methyl ethyl ketone ketones, cellosolves, diacetone alcohol, acrylic acid esters, alkyl vinyl ketones, and the like.

Although an Example is given to the following and this invention is demonstrated to it further more concretely, the meaning of this invention is not limited to the following. In addition, what is "%" and a "part" among a manufacture example, an Example, and a comparative example is shown on a basis of weight unless there is particular notice.

The performance of the primary coating of the unsaturated polyester resin is evaluated for conduit sealing, hardness, thinning (shrinkage of the coating film by polymerization promotion after coating) and adhesion. The evaluation criteria are as follows.

(Conduit sealability)

The coating film produced in the Example or the comparative example is observed directly with eyes, and classified into the following three steps.

(Circle): Conduit sealing is favorable.

(Triangle | delta): Conduit sealing property is normal.

X: The conduit sealability is not good.

(Hardness)

The paint plate produced in Examples or Comparative Examples was measured by JIS K-5400 8.4.2 hand-scratching method, and the result was measured by peeling the coating film. scratch values).

(Thinning)

The coating plate produced in the Example or the comparative example is observed by eye directly, and classified into three steps.

○: Thinning of the coating film does not occur.

(Triangle | delta): There exists a thinning of a coating film.

X: There is much thinning of a coating film.

(Adhesiveness)

Embodiments or with respect to the coating film produced in Comparative Example, the cross-cut method (cross-cut method): to test the (width 2mm, 25mm ²⁾ to be classified into the following three steps:

◎: 25/25

○: 20/25 to 24/25

△: 19/25 or less

(Example 1)

10 parts of styrene monomer, 20 parts of 2-hydroxyethyl methacrylate, methyl ethyl ketone peroxide (50% purity) in 70 parts of unsaturated polyester resin (manufactured by Nippon Synthetic Chemical Industry Co., Ltd .: Gohselac 750-70) To 1.5 parts, 0.5 parts of cobalt octate (8% of metal), 0.6 parts of benzyl dimethyl ketal, and 1.5 parts of 1-hydroxycyclohexylphenyl ketone were added, 25 parts of toluene and 25 parts of ethyl acetate were added to dilute the mixture to form an unsaturated polyester. Get the initial paint. As a wood material, the paint is coated on a pure poplar material (10cm × 20cm, thickness 1cm) by spraying method at 150g / m ² , then left at room temperature (20 ℃) for 30 minutes and put in an oven at 40 ℃ for 20 minutes for internal curing . The paint plate is placed on a conveyor belt under one lit high pressure mercury lamp (80 W / cm) and completely cured while passing at a speed of 3 m / min to obtain a primary coating film. In addition, 20 parts of styrene monomers, 2 parts of methyl ethyl ketone peroxide (50% of purity), and 80 parts of cobalt octenate (metallic powder 8) in unsaturated polyester resin (Japan Synthetic Chemical Co., Ltd .: Gocerak 750-70) 80 parts of chaebol paint %) 0.5 parts, 1 part of 1-hydroxycyclohexylphenyl ketone, and 2 parts of zinc stearate are added to obtain a chaebol paint of unsaturated polyester. This paint is applied to the pure poplar material coated with the above primary coating film at 300 g / m ² by the spray method, and then left at room temperature (20 ° C.) for 30 minutes and placed in a 40 ° C. oven for 20 minutes for internal curing. After confirming that the finger is semi-cured by touching it, the paint plate is placed on a conveyor belt under one lit high-pressure mercury lamp (80 W / cm) and completely cured while passing through at a speed of 1.5 m / min. Make a coating film. As shown in Table 1, the resulting coating film has a harder wood material, superior conduit sealing properties and less thinning as compared to the case where the primary coating material of the two-component polyurethane is used for the initial coating. Thus, a smooth coating film can be obtained. .

(Comparative Example 1)

As a wood material, it is made of pure poplar material (10cm × 20cm, thickness 1cm) with polyester polyol (Nippolan 133-EP manufactured by Nippon Polyurethane Co., Ltd.), 60 parts of hydroxyl group 205 and 40 parts of ethyl acetate. A solution, a solution B consisting of 60 parts of Coronet L (13% NOC) and 40 parts by weight of butyl acetate, is mixed into A solution: B solution = 1: 1. The mixed two-component polyurethane primary coating is coated with a spray method at 100 g / m ² , then left at room temperature (20 ° C.) for 6 hours to dry to obtain a primary coating film. In addition, the properties of the coating film are shown in Table 1 in the same manner as in Example 1.

(Example 2)

10 parts of styrene monomer, 20 parts of 2-hydroxyethyl methacrylate, 2 parts of methyl ethyl ketone peroxide (50% purity), octenic acid, in 70 parts of unsaturated polyester resin (manufactured by Nippon Synthetic Chemical Industries, Ltd .: Gocerak 500B) 25 parts of toluene and 25 parts of ethyl acetate are added and diluted to 0.5 parts of cobalt (8% of metal powder), 0.6 parts of benzyl dimethyl ketal, and 1.5 parts of 1-hydroxycyclohexylphenyl ketone to obtain a primary paint of unsaturated polyester. The paint is coated on a pure paulownia material (10cm × 20cm, thickness 2cm) at 150g / m ² by spraying method, then left at room temperature (20 ℃) for 30 minutes and placed in 40 ℃ oven for 20 minutes for internal curing. The paint plate is placed on a conveyor belt under one lit high pressure mercury lamp (80 W / cm) and completely cured while passing at a speed of 3 m / min to obtain a primary coating film. In addition, the chaebol paint of the unsaturated polyester used in Example 1 as a chaebol paint is coated in the same manner as in Example 1. As shown in Table 2, the resultant coating film has a harder wood material, a thinner coating, less thinning, and excellent adhesion as compared to the case where it is used for the initial coating of a two-component polyurethane coating.

(Comparative Example 2)

The same treatment as in Comparative Example 1 was carried out except that a pure paulownia material (10 cm x 20 cm, thickness 2 cm) was used as the wood material instead of the pure poplar material.

The hardening method of the primary coating film of the unsaturated polyester resin of this invention is the surface hardness equivalent to WPC by the coating of the wood material which does not require a special apparatus, without making WPC (Wood-Plastic-Combination) which has plastic property in wood. And attrition resistance can be obtained, and excellent effects can also be obtained in conduit sealing, prevention of thinning of the coating film, and adhesion of wood materials.

Claims (8)

Unsaturated polyester resins containing organic peroxides, carboxylic acid metal salts, and photopolymerization initiators in the initial coating of wood materials ( After coating the initial coating of polyester polyester resin on wood, the coated film was internally cured at room temperature or heated, and then irradiated with active energy rays. Surface hardening The hardening method of the primary coating film of unsaturated polyester resin characterized by the above-mentioned. In the initial coating of wood materials, the coated film is coated at room temperature or after the initial paint of an unsaturated polyester resin containing an organic peroxide, a carboxylic acid metal salt and a photopolymerization initiator and an ethylenically unsaturated monomer. Internal curing under heating, followed by irradiation with active energy radiation The hardening method of the primary coating film of unsaturated polyester resin characterized by the above-mentioned. The method according to claim 1 or 2, The carboxylic acid metal salt is a high fatty acid cobalt salt. The hardening method of the primary coating film of unsaturated polyester resin characterized by the above-mentioned. The method of claim 3, The higher fatty acid cobalt salt is cobalt octenoate. The hardening method of the primary coating film of unsaturated polyester resin characterized by the above-mentioned. The method of claim 2, The ethylenically unsaturated monomer is a vinyl monomer and a (meth) acrylic monomer. The hardening method of the primary coating film of unsaturated polyester resin characterized by the above-mentioned. The method of claim 5, The (meth) acrylic monomer is 2-hydroxy ethyl methacrylate. The hardening method of the primary coating film of unsaturated polyester resin characterized by the above-mentioned. The method according to any one of claims 1 to 6, The average water content of wood materials is 3 to 20% by weight and the dry density is 0.30 to 1.00g / cm ³ The hardening method of the primary coating film of unsaturated polyester resin characterized by the above-mentioned. The method according to any one of claims 1 to 7, The active energy ray is ultraviolet The hardening method of the primary coating film of unsaturated polyester resin characterized by the above-mentioned.