JPS60115608A - Thermosetting resin composition - Google Patents

Abstract

PURPOSE:The titled composition capable of forming a good coating film without inhibition of curing when applied to the surface of resinous wood, prepared by mixing an unsaturated polyester resin or a like resin with a compound having at least three (meth)acryloyl groups. CONSTITUTION:Use is made of a compound having at least three (meth)acryloyl groups in the molecule, such as tri(acryloyl-oxyethyl) isocyanurate, pentaerythitol tetra(meth)acrylate, or dipentaerythritol hexa(meth)acrylate. Namely, 100pts.wt. at least one thermosetting resin selected from the group consisting of unsaturated polyester resisns, epoxyacrylate resins, and allyl resins is mixed with 10- 200pts.wt. above compound. The obtained thermosetting resin composition is dissolved or dispersed in an organic solvent and then mixed with a polymerizable monomer such as styrene, a curing catalyst and other additives to form the composition for painting wood.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermosetting resin composition that does not suffer from curing light damage and yet forms an excellent coating film.

Conventionally, when painting wood with a high resin content such as rosewood, porcelain, and mahogany with thermosetting resin such as polyester resin, curing 111I damage may occur, resulting in a beautiful coating film. j4 I can't. Therefore, either apply a Urekun resin sealer between the paint film and the wood surface, or
Alternatively, measures have been taken to extract and separate curing-inhibiting components using a solvent such as methanol before painting. However, in the former case, the urethane resin is coated and dried, which is complicated, and also poses a problem in terms of cost. In addition, in the latter case, when the hardening inhibiting components are extracted and separated using a solvent, not only the hardening inhibiting components but also other components are extracted, so the only characteristic of this type of wood is the blackish appearance, which significantly reduces the commercial value. It will lower it. There was a desire for an improved method without using a trowel, sealer treatment, or extraction treatment.

The present invention relates to a thermosetting resin composition that can solve the problems listed in -1- all at once. That is, a) at least one type of thermosetting resin selected from unsaturated polyester resins, epoxy acrylate resins, and allyl resins, and b) containing three or more acryloyl groups or methacryloyl groups in one molecule. The present invention relates to a thermosetting resin composition having an excellent tar-preventing effect on wood, characterized in that it contains 10 to 200 parts by weight of a compound containing a kW of a compound.

The unsaturated polyester resin used in the present invention is not particularly limited, and includes polybasic saturated acids such as phthalic anhydride, isophthalic acid, and terephthalic acid, maleic anhydride, fumaric acid, and itaconic acid. polybasic unsaturated acids, and ethylene glycol, propylene glycol, neopentyl glycol, butanediol, 2,2-(4'-
It refers to a polyester resin that has been dehydrated and condensed using polyhydric alcohols such as hydroxypropoxyphenol (propane), hydrogenated bisphenol A, and trimethylolpropane.

The epoxy acrylate resin used in the present invention is not particularly limited, and is a resin made by reacting an epoxy resin with an unsaturated basic acid. Examples of the epoxy resin include bisphenol-based epoxy resins and novolak-type epoxy resins. Examples of unsaturated basic acids include acrylic acid and methacrylic acid. A portion of the unsaturated basic acids may be replaced with dibasic acids such as phthalic acid, adipic acid, fumaric acid, succinic acid, etc.

The allyl resin used in the present invention refers to a resin containing an allyl group, and examples thereof include prepolymers such as diallyl phthalate, diallyl isophthalate, and diallyl maleate.

Compounds containing 3 or more acryloyl or methacryloyl groups in one molecule used in the present invention include trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, Pentaerythritol tetra(meth)acrylate, dipentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, tris(meth)acryloyloxyethyl phosphate, tri((meth)acrylate) Examples include polyfunctional monomers such as esters of acrylic acid and methacrylic acid such as (royloxyethyl) isocyanurate, and triacryl formal. The principle of the tar-preventing effect of these compounds is not fully understood, but the more functional groups the compounds have and the higher the melting point, the better the results.

The amount of these compounds used is usually 10 to 200 parts by weight, preferably 20 to 100 parts by weight, per 100 parts of at least one thermosetting resin selected from unsaturated polyester resins, epoxy acrylate resins, and allyl resins.
Department. If the amount used is less than 10 parts by weight, the tar-preventing effect will not be sufficient, and if more than 200 parts by weight is used, the life of the resin will not only be shortened, but the cost will be increased.

In general, these compositions contain solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone, ethyl acetate, butyl acid, benzene, toluene, xylene, styrene, divinylbenzene, methyl methacrylate, ethyl acrylate,
It is often used in combination with polymerizable monomers such as ethylene glycol dimethacrylate and diallyl phthalate.

Furthermore, depending on the purpose, a thixotropic agent, an abrasion resistance improver, a coloring agent, an anti-gelling agent, an inorganic filler, etc. may be added.

Methods for processing this thermosetting resin composition into wood include heat curing using a polymerization initiator such as benzoyl peroxide, tert-butyl perbenzoate, dicumyl peroxide, and rawaloyl peroxide; Always use a curing agent such as oxide, methyl isobutyl chloride + side, etc. together with a curing accelerator such as cobalt naphthenate! ll! method of curing,
There are photocuring methods using photosensitizers such as benzoin, benzyl, benzoin ether, etc., and electron beam curing methods.

The wood species used include Indian rose, Andean rose, purple rose, American walnut, mahogany, teak, ebony, and Kabul, which have a high resin content, which is a harmful substance. Recently, these woods have been increasingly used as veneer boards, which are usually made by laminating thin veneers of these woods to plywood or the like.

The method for painting wood is to use a roll coater directly on the wood.
There are several methods, such as coating it on a film and then transferring it to the wood surface, and spraying it with a spray amplifier.Finally, heat pressing is often used to improve the El-raising. The film thickness is usually 50 to 1000 microns, preferably 100 to 500 microns.

The present invention will be explained below with reference to Examples (although the present invention is not limited thereto), parts and percentages in Examples and Comparative Examples are given with no hesitation unless otherwise specified. and represents a trivial %.

Example 1 04 moles of isophthalic acid, 06 moles of maleic anhydride, 0.3 moles of neopentyl glycol, and 075 moles of furopylene gellicol were subjected to dehydration condensation to obtain an unsaturated polyester resin having an acid value of 12. For 100 parts of this resin, 60 parts of pentaerythritol tetraacrylate, 10 parts of acetone.
0 parts of toluene, 60 parts of toluene, and 3 parts of benzoyl peroxide were added to prepare a resin composition, which was coated on a polyester film and dried at 80°C to obtain a coating film with a thickness of +9: 200μ. Add this to Andes Rose 1. Place the LT board on the surface of the board so that it is in contact with the paint film or the board, and heat at 120°C.
, 10 and 97- for 15 minutes.

No white spots due to curing inhibition were observed on the surface of the pressed product, and the gloss was excellent.

:1' I11+) Example 2 Sumiepoxy F, S A-011 (Epoxy purpose 4
70, Sumitomo Chemical Co., Ltd. product) 04 mol and methacrylic acid 08
An epoxy acrylate resin having an acid value of 2 was obtained by addition reaction with molar. This resin j.

0 parts, 20 parts of empentaerythritol hexamethacrylate, 10 parts of ethylene glycol dimethacrylate
0 parts and 10 parts of benzoin methyl ether were added to prepare a resin composition. This was applied to the surface of a veneer board to which Indian rose veneers were bonded, a polyester film was placed on the surface, and the film was irradiated with ultraviolet rays for 5 minutes to cure it.

No white spots were observed on the surface, and the gloss was good.Example 3: 100 parts of diallyl phthalate resin (Guisoda Nobu A, Osaka Soda Gyokugyo Co., Ltd.) was mixed with 100 parts of tri(methacryloyloxyethyl) incyanure). part, acetone 12
0 parts, 80 parts of benzene, and 3 parts of benzoyl peroxide were mixed in 11 parts to make a resin composition. This was applied to the surface of a veneer board with teak veneer laminated, dried at 80°C, and +1
．． A coating film with a thickness of 3 n + 1 μm was obtained. A polyester film was placed on top of this and pressed at 140° C. and 10/4 for 10 minutes.

The surface of the obtained pressed product had no white spots and had good gloss.

Example 4 Unsaturated polyester resin 100 similar to actual Ifli example 1
30 parts of dipentaerythritol pentaacrylate, 110 parts of styrene, 2 parts of thixotropic agent (silicon oxide), 1 part of cobalt naphthenate, and 3 parts of methyl ethyl kent peroxide were added to [7] to prepare a resin composition. This was applied by spraying onto the surface of a veneer board to which Mahocanino veneer was bonded, and a polyester film was placed on top of it with a roller to form a uniform coating, which was then left at Utaka for 4 hours to harden.

The resulting cured coating had no white spots and had good gloss.

Comparative Example 1 Isophthalic acid 04 mol, maleic anhydride 06 mol, neopentyl glycol 03 mol, propylene glycol 0
75 moles were subjected to dehydration condensation to obtain a 6-saturated polyester resin with an acid value of 12. For 100 parts of this resin, 20 parts of diallyl phthalate monomer, 70 parts of acetone, 50 parts of toluene
M≦, a resin composition was prepared by adding 2 parts of Hensoil peroxide. This resin liquid was applied to the polyester film 1-
After drying at 80°C, SoR was placed on the surface of a veneer board to which Andes Rose veneer was bonded so that the coating film was in contact with the board, and pressed at 120°C, 10°C, and 9/cA for 15 minutes.

On the surface of the obtained pressed product, white spots due to hardened tar were seen in various places. jl';i<f'l
The overall fever was inferior.

Comparative Example 2 A pressed product was obtained in the same manner as Comparative Example 1 and (11) except that 5 parts of pentaerythritolunatraacrylate was used instead of 20 parts of diallyl phthalate monomer in Comparative Example 1. The white spots were fewer or slightly visible than in Comparative Example 1, posing a practical problem.Also, the gloss was not sufficient.

Claims (1)

[Claims] 1. a) At least one thermosetting resin selected from unsaturated polyester resins, epoxy acrylate resins, and allyl resins, based on 100 parts by weight and 111 parts: 1)) 3 per molecule
10 to 200 compounds containing acryloyl groups or methacryloyl groups or more in the cap part. The thermosetting resin composition according to claim 1, which is a compound containing three or more acryloyl or methacryloyl groups or tri((meth)acryloyloxyethyl)in cyanurate. 31 molecules Compounds containing three acryloyl or methacryloyl groups or pentaerythritol tetra (
Claim 1, item 4, which is acrylate
Hiki's thermosetting resin composition. 41 Compounds containing 3 or more acryloyl or methacryloyl groups in the molecule, selected from dipentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(-meth)acrylate The heat 1i! according to claim 1, which is at least one type of heat 1i! II-formable resin compact.