JPH0393819A - Resin composition for wood processing - Google Patents

Abstract

PURPOSE:To provide the subject composition composed of an unsaturated polyester resin, etc., having >=3 OH groups and an unsaturated monomer, etc., and capable of keeping the water-resistance over a long period without lowering the strength of a wooden material. CONSTITUTION:The objective composition is composed of (A) at least one kind of a resin selected from an unsaturated polyester resin containing >=3 hydroxyl groups in the molecule and an epoxy acrylate resin containing >=3 hydroxyl groups in the molecule, (B) an unsaturated monomer (e.g. styrene) and, as necessary, (C) a polyether compound and (D) a polymerization catalyst (e.g. benzoyl peroxide).

Description

DETAILED DESCRIPTION OF THE INVENTION (Business use) The present invention is a resin composition for wood processing with improved water resistance. (Prior Art) When wood materials are used in plumbing areas such as kitchens and bathrooms, or outdoors, they absorb moisture, causing dimensional changes and becoming deformed or distorted. In order to prevent this, a method of impregnating polyethylene glycol etc. has been proposed, but the impregnated water material obtained in this way has a low surface hardness, but when exposed to water for a long time, polyethylene glycol etc. will elute. is observed and the performance deteriorates. (Problems to be Solved by the Invention) The object of the present invention is to find a wood-processed resin composition that can improve water resistance without reducing the strength of wood materials, and can maintain that water resistance for a long time. I made it a task. (Means for Solving Itll! If) The inventors of the present invention conducted tests on various resins in order to solve the above problem, and as a result, they completed Book 5. That is, the present invention (A
) At least one type (B
The present invention provides a wood-processed resin composite characterized by comprising (C) an unsaturated monomer, (C) a polyether compound as required, and (D) a polymerization catalyst. As for the unsaturated polyester resin containing three or more hydroxyl groups in the molecule used in the present invention, (1) alcohol containing trivalent or higher hydroxyl groups is used as one part of the polyol component, and the polyester terminal is (2) A case in which the ratio of polybasic acid and polyol is adjusted to form a hydroxyl group, and (2) a case in which a polyepoxy compound and a polybasic acid are sequentially reacted to form a polyester. Examples of alcohols containing three or more hydroxyl groups include glycerin, trimethylolbroban, and pentaerythritol. Other polyols include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol,
Examples include neopentyl glycol and hexylene glycol. Examples of polybasic acids include maleic anhydride, fumaric acid, itaconic acid, phthalic anhydride, isophthalic acid, terephthalic acid, adipic acid, and sebacin a. Examples of polyepoxy compounds include polyglycidyl compounds such as epoxy resins and am-type dieboxy compounds. In addition, 3 (flit
Epoxy acrylate resins containing epoxy resins include epoxy resins that already contain one or more water I1 groups in the molecule, or epoxy #Ia containing three or more glycidyl groups, and monocarboxylic acids containing acrylic acid and methacrylic acid. In some cases, (2) an unsaturated compound containing at least 1111 hydroxyl groups and a carboxylic acid in the molecule is reacted with an epoxy resin containing two or more glycidyl groups. Molecule as an epoxy resin containing one or more hydroxyl groups in the molecule! Examples include bisphenol A type epoxy resins having a molecular weight of 330 or more, and examples of epoxy resins containing three or more glycidyl groups include novolac type epoxy resins. Examples of unsaturated compounds containing at least one hydroxyl group and one carboxylic acid group in the molecule include polyols, unsaturated dicarboxylic acids, or their anhydrides, such as maleic anhydride and water I! Examples include those subjected to an esterification reaction so that one or more l1 groups remain in the molecule. The above two types of compounds may be used alone or in combination. Examples of unsaturated Ji-mers include aromatic vinyl compounds such as styrene, vinyltoluene, and chlorostyrene; (meth)acrylic compounds such as methyl (meth)acrylate, ethyl (meth)acrylate, and butyl (meth)acrylate; and diallyl phthalate. At least lm is selected from allyl compounds such as diallyl fumarate and diallyl maleate. Examples of polyether compounds include polyethylene glycol and polypropylene glycol. Additionally, it is optional to add a solvent such as ethyl cellosolp if necessary. In addition, as a polymerization catalyst, diasilver oxides such as penzoyl peroxide, laucyl peroxide, tertiary butyl peroxy isopropyl carbonate,
Organic peroxides such as peroxyesters such as tertiary butyl perpenzoate, or azo compounds are used. Wooden materials to which the *R composition of the present invention can be applied may be softwood or hardwood veneers or members, particle boards, and wood II fiberboards. When these wooden materials are impregnated with a resin composition, a reduced pressure impregnation method or a reduced pressure one-pressure method may be used. It is also necessary to heat the impregnated wood material to a temperature of usually 100 to 150°C to harden the wood. The resin-impregnated wood that has been hardened as described above can be used as a wood-based material for wet areas such as kitchens and bathrooms, and for outdoor use. The present invention will be explained below using examples, but is not limited thereto. Example 1 1 mol of glycerin and 2 mol of maleic anhydride at 150°C
The reaction was carried out under reaction conditions that did not allow water to escape from the system, and then Sumieboxy OELA-128 (Sumitomo Chemical Co., Ltd.) 1
Resin 50 obtained by adding mol and reacting at 170°C
Add 500 g of styrene and log of penzoyl peroxide to 0 g. A pre-dried white ash material having a thickness of 100 tm and a length of 200 mm was impregnated with the thus obtained 11 pieces of Tree II by a vacuum method, and the mixture was cured at 140°C for 30 minutes. The surface hardness of Tajuura impregnated water material is Barcol 935, 9.
0 and was sufficiently hard and was immersed in 40℃ water for 20 hours. 'JI ability (A.S, E) shows 85%,
It showed high water resistance. This value remained unchanged even after immersion in water at 40°C for an additional 30 days. Example 2 An SR composite obtained by adding 20 g of polyethylene glycol #1000 to 202 g of the VA resin composition of Example 1 was pre-dried to a thickness of l O m x @ 100 tm.
A white ash material having a length of 200 IffI was impregnated by a vacuum method and cured at 140°C for 30 minutes. Got it! ! The surface hardness of 4R impregnated water material is 85 with Barcol 935.
The anti-I! The I1 moisture capacity (A.S.E.) was 95%. Furthermore, the anti-swelling ability (A.S.E.) of dredge immersed in water at 40°C for 30 days was 90%. The decline stopped at fl. Example 3 1 mole of diethylene glycol and 1 mole of maleic anhydride were reacted at 150°C, and then Sumieboxy ELA
Add 1 mol of -128 (4 products from Sumitomo Chemical Industries) to 170°C
Add 300 g of styrene and 10 g of penzoyl peroxide to 700 g of the tree ITI1 (containing a 4a hydrogen group in the molecule) obtained by the reaction. The resin composition thus obtained has a thickness of 3 m x @1
A cypress veneer measuring 0.0 m x 200 mm in length was impregnated by a reduced pressure method and press hardened at 130°C x 8 minutes x 8 bites/C. The surface hardness of the obtained fRW1'@immersion veneer was 70 on Barcol 935, and it was immersed in water at 40°C.
Anti-swelling ability (A, S.E) when immersed in 0 special IIO is 80
%, indicating high water resistance. There was no change in this plant even after it was immersed in water at 40°C for an additional 30 days. Example 4 Sumiepoxy, a bis-based epoxy resin containing an average of two hydroxyl groups in the molecule. Styrene 400g to 600g (containing hydroxyl group)
g and 10 g of tert-butyl peroxyisopropyl carbonate are added. Grind the thus obtained ami, m or object 3 m x width 1
0 0 m + a x 200 nn long cypress! Impregnated onto n plate by vacuum method, 150℃ x 8 minutes x 8 kg/c
Press hardening was performed under rd conditions. The surface hardness of the obtained m fat-impregnated veneer was 80 in Barcol 935, and the anti-swelling ability of Samurai (A
．． S, E) showed 85%, indicating high water resistance. This value did not change even after immersion in water at 40°C for an additional 30 hours. Comparative example 1 Polyethylene glycol #600 with a thickness of 3 m x @
A cypress veneer measuring 100 m x 200 m in length was impregnated with the polyethylene glycol by the immersion method, and the polyethylene glycol adhering to the surface was wiped off to measure the surface hardness, which was 935 Barcol and found to be soft. Also, 20 +Irt in 40”C water
110 Soaked Taharuno [1191 (A.S.E.
) was 70%, but when immersion was continued for an additional 30 days, the anti-swelling ability (A.S.E) decreased to 10%. (Effects of the Invention) As is clear from the Examples and Comparative Examples, the present invention is a wood-processed resin composition that improves the water resistance without reducing the strength of the wood material and can maintain its water resistance for a long time. be.

Claims (1)

[Scope of Claims] (A) At least one type of unsaturated monomer selected from unsaturated polyester resins containing three or more hydroxyl groups in the molecule and epoxy acrylate resins containing three or more hydroxyl groups in the molecule (B) Unsaturated monomer (C) A resin composition for wood processing, comprising a polyether compound (D) a polymerization catalyst, if necessary.