JPS61163803A - Method of hardening woody material impregnated with resin - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for curing a resin-impregnated wood material by heating and curing the wood material impregnated with a thermosetting resin without hot-pressing.

Conventionally, a method has been used in which a thin wood veneer is impregnated with a thermosetting resin and cured using a hot press method. However, in the case of thick wood materials or wood materials with irregular structures, hot press may not be suitable. In such cases, when trying to cure the resin-impregnated wood as it is in a heating oven, the vinyl monomer contained in the resin inhibits air curing, resulting in the surface not being sufficiently cured and only a sticky product obtained. I can't do it.

The present invention has been made in view of the above drawbacks. That is, a wood material is impregnated with at least one type of thermosetting resin selected from unsaturated polyester resin, epoxy acrylate resin, acrylic urethane resin, and diallyl phthalate resin, and then a urethane resin is applied to the surface of the wood material, followed by hot-pressing. The present invention relates to a method for curing resin-impregnated wood, which is characterized by curing by heating.

The wood material used in the present invention may be wood itself,
Alternatively, a processed wood material such as particle board may be used. It can be applied to all wood materials that do not use the hot press method as a curing method. Especially knife handles, bobbins, knobs, and picture frames.

Its superiority is demonstrated in processed items such as window frames, plate-like objects, and rod-like objects with a thickness of one dragon or more.

The unsaturated polyester resin used in the present invention is obtained by dissolving a polyester resin obtained from an unsaturated polybasic acid and, if necessary, a polybasic acid including a saturated polybasic acid and a polyhydric alcohol, in a vinyl monomer. . Epoxy acrylate resin is obtained by dissolving the reaction of acrylic acid or methacrylic acid with engineered poquin resin in vinyl monomer. Acrylic urethane resin is obtained by dissolving a urethane oligomer containing a terminal isocyanate group and an acrylic acid or methacrylic acid derivative containing a hydroxyl group in a vinyl monomer. or,
Diallyl phthalate resin is obtained by dissolving a prepolymer of diallyl phthalate or diallyl isophthalate in a vinyl monomer.

The thermosetting resin used in the present invention contains a curing catalyst necessary for heat curing. As the curing catalyst, a vinyl polymerization initiator such as an organic peroxide such as benzoyl peroxide or tert-butyl perbenzoate or an azo compound such as azobisisobutyronitrile is used.

The urethane resin for surface coating used in the present invention is not particularly limited, but examples include polyol,
Polyester polyol.

Examples include reaction products of polyether polyols and polyisocyanates such as toluene diisocyanate, methylene bis(4-7 enyl isocyanate), and xylylene diisocyanate. Among these, moisture-curing urethane resins, which are cured by moisture in the air, are preferred.

It can be used by dissolving it in an appropriate solvent.

A method for impregnating a wood material with a resin is usually to impregnate a previously dried wood material using a reduced pressure method or a reduced pressure-pressure method. After the impregnation, the urethane resin is evenly applied to the surface of the wood material using a brush or spray.

If possible, leave it at room temperature for several hours and then put it in a heating oven to harden. The temperature and time at that time are determined by the curing catalyst used, but for benzoyl peroxide, for example, it is preferably 80°C to 100°C for 2 to 6 hours.

After the hardened resin-impregnated wood material is subjected to post-processing such as polishing, it is made into knife handles and knife handles.

window frames, picture frames, table tops, counters, doorknobs,
It can be applied to automobile shift lever knobs, baseball barrels, golf heads, spinning bobbins, wooden molds, etc.Next, the present invention will be explained in more detail with reference to examples, but it is by no means intended to be actualized therein. do not have. All "parts" and "%" are based on weight.

Example 1 Unsaturated polyester resin "Smiatsubu P-100" containing styrene as a vinyl monomer (Sansoku Kako ■
Production) per 100 copies.

Two parts of benzoyl peroxide were mixed to prepare a resin liquid for impregnation.

A knife handle (made of Yigimu), which had been dried in advance at 100° C. for 5 hours, was impregnated with the above impregnating liquid by a reduced pressure method.

Next, brush E is impregnated with urethane resin (urethane resin obtained by reacting toluene diisocyanate with polyester polyol from trimethylolprobant adipic acid) dissolved in methyl ethyl ketone and applied to the surface of the knife handle. After leaving it for 2 hours,
It was heated and cured at °C for 4 hours.

The surface of the handle of the obtained knife was completely hardened, showing a Percoll hardness (type 934) of 70, and there were no problems with post-processing with sandpaper.

Comparative example! The urethane resin was not applied as in Example 1, and the sample was heated at 90° C. for 4 hours. The surface of the resulting knife handle was not sufficiently hardened.

It was sticky. Post-processing with sandpaper was difficult.

Example 2 A resin for impregnation was prepared by mixing 2 parts of benzoyl peroxide with 100 parts of an epoxy acrylate resin containing styrene as a vinyl monomer "Smiatube EVR-9114 (Sansoku Kako, Fin Manufacturing).

10 mm thick, pre-dried at 80°C for 10 hours
A plate having dimensions of 150 m in width and 500 n in length (made of ash) was impregnated with the above impregnating liquid by a reduced pressure method.

Next, a urethane resin (obtained by reacting trimethylolpropane and toluene diisocyanate) dissolved in acetone was applied uniformly to the impregnated board using a brush, and after being left for 1 hour, it was heated at 80°C and 95°C. It was heated and cured for a period of time.

The surface of the obtained board was completely hardened, showing a Percoll hardness (type 934) of 75, and post-processing with sandpaper was not a problem.

Comparative Example 2 The urethane resin in Example 2 was not applied, and the sample was heated at 80° C. for 5 hours. The surface of the obtained board was not sufficiently cured and was sticky. Post-processing with sandpaper was difficult.

Example 3 For 100 parts of an acrylic urethane resin containing styrene as a vinyl monomer (a polyester polyol made from 1,4-butanediol and adipic acid is reacted with toluene diisocyanate and then with hydroxyethyl methacrylate), Two parts of benzoyl peroxide were mixed to prepare a resin liquid for impregnation.

Thickness 3o rxx pre-dried at 120℃ for 4 hours
It was difficult to post-process a bar (made of agathis material) with dimensions of 60 mm in width and 200 mm in length using the vacuum-pressure method with the above-mentioned impregnating liquid.

Example 3 Acrylic urethane resin containing styrene as a vinyl monomer (a polyester polyol made from 1,4 butanediol and adipic acid is reacted with toluene diincyanate, and then with hydroxyethyl methacrylate) per 100 parts and 2 parts of benzoyl peroxide were mixed to prepare a resin liquid for impregnation.

It was dried in advance at 120°C for 4 hours. A rod with dimensions of 30mm thick, 60mm wide, and 200m1t long (material: agathis)
was impregnated with the above impregnating liquid by a vacuum-pressure method.

Next, photosensitive resin (pentaerythritol tetraacrylate and epoxy acrylate resin "Smiatube BV")
Mixture with R-911J.

A tripartite composition of benzophenone and methyl ethyl ketone.

) was first applied uniformly onto the surface of the impregnated rod using a brush, and then irradiated for 5 minutes with an irradiation device containing a high-pressure mercury lamp.

Thereafter, it was heated in a heating furnace at 100° C. for 3 hours to harden it.

The surface of the rod obtained is completely hardened and exhibits a Neucor hardness (type 934) of 75.

Post-processing with sandpaper is also a problem.

Comparative Example 3 The coating and irradiation of the photosensitive resin liquid in Example 3 were not carried out, but heating was continued at 100° C. for 3 hours. The surface of the resulting bar was not sufficiently cured and was sticky. Post-processing was difficult due to the size of the sandpene.

Procedural amendment 1. Description of the case 1985 Patent Application No. 6093 2 Title of the invention Method for curing resin-impregnated wood materials 3 Person making the amendment Relationship to the case Patent applicant address 7-5-21 Motoyama Minami-cho, Higashinada-ku, Kobe City 4,
Column 5 of the detailed explanation of the invention subject to amendment, the first line from the top of page 9 of the statement of contents of the amendment, ``Post-processing...''
・From the bottom of page 10 from the bow, I impregnated the part that says "...it was difficult." with the following correction.

Next, a urethane resin (a product made by reacting xylylene diisocyanate with a reaction product of glycerin and phthalic acid) dissolved in ethyl acetate was uniformly applied to the surface of the impregnated rod before the brush counter, and left for 3 hours. Later, 100℃, 3
It was heated and cured for a period of time.

The surface of the resulting rod is completely hardened.

It showed a Percoll hardness (type 934) of 65, and there were no problems with post-processing with sandpaper.

Comparative Example 3 Without applying the urethane resin in Example 3, the sample was heated at 100° C. for 3 hours. The surface of the rod obtained was not sufficiently cured and was sticky. Post-processing with sandpaper was difficult. ”

Claims (1)

[Claims] 1) A wood material is impregnated with at least one type of thermosetting resin selected from unsaturated polyester resin, epoxy acrylate resin, acrylic urethane resin, and diallyl phthalate resin, and then urethane resin is applied to the surface and hot pressure pressed. 2) A method for curing a resin-impregnated wood material, characterized in that the urethane resin is a moisture-curable resin. .