JPH0443483B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for manufacturing a reinforced decorative material that allows uniform injection of a synthetic resin liquid.

(Prior Art) Conventionally, various types of precious wood have been widely used in the field of new wood building materials, but the price of high-quality precious wood has soared as precious wood resources are depleted.

On the other hand, techniques such as the so-called Wood Plastic Combination have been devised to improve the durability of wood materials by injecting synthetic resin liquid into such precious wood.
A pressurization method, a vacuum pressurization method, etc. are adopted.

However, depending on the type of wood material, penetration of the synthetic resin liquid is partially inhibited by wood extract components mixed in the material, and uniform injection treatment is often difficult. Therefore, these wood extract components have traditionally been removed using hot water, alcohol, and various other organic solvents, but it is difficult to remove these processing solutions after the extraction process, and the removal effect is not sufficient. It wasn't.

(Problem to be Solved by the Invention) Therefore, when injecting synthetic resin liquid, there are methods such as carrying out a test injection in advance and selecting only easy-to-inject materials, or selecting easy-to-inject materials empirically based on the appearance of the wood. However, these methods have not been fully utilized as industrial methods because they cause problems such as difficulty in repurposing difficult-to-inject materials and the production of a large number of defective products.

(Means for solving the problem) Therefore, the present inventors investigated various treatment methods in order to solve the above-mentioned problems, and found that by pre-treating the wood material with an aqueous surfactant solution. The inventors have discovered that these problems can be solved and have arrived at the present invention. That is, the present invention is a method for producing a decorative material, which is characterized in that a wood material is treated with an aqueous surfactant solution in advance before injecting a synthetic resin liquid.

(Summary of the invention) Wood Plastic, which injects synthetic resin liquid into wood
The Combination technique not only improves the physical properties of wood such as abrasion resistance, water resistance, impact resistance, chemical resistance, crack resistance, and rot and insect resistance, but also improves the design and color tone. Since it is also important to improve the physical properties of wood, it is essential to uniformly inject the synthetic resin liquid into the wood. Examples of the synthetic resin liquid used in the injection of the present invention include various monomers such as styrene, methyl methacrylate, and butyl acrylate, diallyl phthalate prepolymers, oligomers such as unsaturated polyester, melamine resin, phenolic resin, urea resin, etc. Those commonly used for this purpose, such as initial condensates of various water-soluble resins, can be used.

The type of wood material into which the synthetic resin liquid is injected varies depending on the purpose, but various hardwood materials such as birch wood, barrel wood, and ash wood, as well as various softwood materials such as pine, cedar, and cypress wood, can be used. can. As for the shape of these wood materials, in addition to wood, various wood materials such as sliced veneer, skirted veneer, etc. can be used.

As the surfactant, nonionic surfactants can be used, and ether type nonionic surfactants such as polyoxytylene alkyl ether and polyoxyethylene alkyl phenyl ether are particularly good. Since these surfactants do not ionically dissociate in an aqueous solution, they are not affected in any way even in hard water containing various metal salts and organic salts. Furthermore, it is superior to anionic or cationic surfactants in terms of compatibility with various solvents and chemicals, making it optimal for the purpose of the present invention. The concentration of the surfactant aqueous solution varies depending on the type of wood to be treated, but usually an aqueous solution of about 1 to 10% can be used. As for the treatment method, the liquid ratio is about 5 to 10 times by dipping, and the treatment time is about 1 to 10 hours. After the immersion treatment is completed, the veneer is sufficiently washed with water and dried by a conventional method to obtain a veneer for injection of synthetic resin liquid. In addition, during the treatment, the treatment time can be shortened by heating the surfactant aqueous solution if necessary.

Example 1 After immersing 200 Japanese pine slice veneers (0.8 mm thick) in a 5% aqueous solution of polyoxyethylene alkyl phenyl ether type nonionic surfactant at a temperature of 80°C for 3 hours, A veneer for pouring (water content: 5%) was obtained by washing with water and drying in a conventional manner.
Then, this unsaturated polyester resin containing 1% of benzoyl peroxide was injected under reduced pressure, and then a predetermined pressure was applied to obtain a synthetic resin liquid-injected veneer.

Next, the veneer was hot-press bonded to lauan plywood (12 mm thick) using a water-based vinyl urethane resin adhesive to obtain a reinforced decorative board. The obtained reinforced decorative board was beautiful and had no unevenness in design due to non-uniform impregnation.

Comparative Example 1 A reinforced decorative board was prepared by the same method as in Example 1 except for the treatment with a nonionic surfactant, but the obtained reinforced decorative board had extremely many irregularities in design.

(Effects) Although the manufacturing method of the reinforced decorative material of the present invention is an extremely simple manufacturing method, a uniform injection effect can be obtained, and thus it can be utilized as an industrial method. Moreover, the decorative material has uniform strength, and there is no unevenness in design due to non-uniform impregnation of the resin liquid, and a reinforced decorative material with high commercial value can be obtained.

Claims (1)

[Claims] 1. In a method for producing a reinforced decorative material in which a synthetic resin is injected into a wood material, the wood material is pre-soaked in an aqueous solution of a nonionic surfactant, and then the wood material treated with the surfactant is dried, A method for producing a reinforced decorative material, which comprises injecting a synthetic resin liquid.