JPS63156570A - Production of wooden decorative sheet - Google Patents

Abstract

PURPOSE:To improve the wear resistance of the title wooden decorative sheet, by coating a primer incorporated with green silicon carbide and white alumina on the upper surface of colored decorative plywood, coating an intermediate paint thereon, polishing the upper surface, and then applying a finish coat. CONSTITUTION:A primer contg. 10wt% green silicon carbide having 30-80mum particle size, based on the nonvolatile matter of the transparent or translucent primer resin, and 5-20wt% white alumina having the same particle size is coated at >=20g/m<2> WET on the colored decorative sheet obtained by laminating natural-wood decorative veneer. A transparent or translucent intermediate paint contg. no wear-resistant materials such as green silicon carbide and white alumina is then coated thereon and dried. The upper surface is polished, and a finish coat is applied. As a result, the coated film on the upper surface of the natural- wood decorative veneer is not discolored, roughness is never caused, and the wear resistance is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for manufacturing decorative wooden boards used as floorboards for houses.

Conventional technology Conventionally, decorative natural wood floorboards used as floorboards in houses have often been made of decorative veneer with only a transparent coating applied, and even if the coating itself wears away during use, the decorative veneer remains. If so, the beauty could be restored by repainting.

In recent years, colored floorboards, in which the decorative veneer itself is colored or dyed, have come into widespread use in order to color coordinate the interior of a home to match one's tastes, and the use of colored floorboards will continue to increase in the future. I think that the. In the case of colored floorboards, unlike decorative floorboards that are only coated with transparent paint, if the colored layer peels off along with the surface coating due to wear during use, the aesthetic appearance deteriorates and repair is impossible even if the decorative veneer remains. . Therefore, a method of adding silicon carbide or 1-alumina to the paint has been developed in order to improve the abrasion resistance of the surface coating film.

Problems to be Solved by the Invention However, when silicon carbide or d-alumina is added to the surface coating of colored decorative plywood, there is a drawback that the coating may change color or become rough depending on the amount added.

In order to solve these problems, the present invention adheres a decorative natural wood veneer to the top surface of the plywood, and coats the top surface of the colored decorative plywood with green silicon carbide or white alumina so that the color tone does not change and the surface is rough. 1. A method for manufacturing a wood decorative board, in which a base coat containing abrasion resistant material is applied to the upper surface, an intermediate coat containing no abrasion resistant material is applied to the upper surface, the upper surface is polished, and then a top coat is applied. , is characterized in that the paint film on the top surface of the colored layer of the natural wood decorative veneer can be improved in abrasion resistance without causing discoloration or roughness.

Means for Solving the Problems In order to achieve this object, the present invention has the following configuration.

A natural wood decorative veneer is attached, and green silicon carbide with a particle size of 30 to 80 microns is applied at a weight ratio of 10 to the resin non-volatile content of a transparent or translucent undercoat on the top surface of the colored decorative plywood.
% and an undercoat containing 5 to 20 g/m of white alumina of the same particle size is applied at a rate of 20 g/m or more,
A transparent or translucent intermediate coat that does not contain an abrasion resistant material such as green silicon carbide or white alumina is applied to the top surface of the base coat, and after the intermediate coat dries, the top surface of the base coat is polished, and the finished surface of the intermediate coat is polished. A top coat of paint is applied to the wood to create a wood decorative board.

Effects The green silicon carbide mixed into the primer paint is the second hardest mineral on the new Mohs hardness scale, next to diamond. However, since it has a green tinge, if it is mixed in more than 10% of the nonvolatile content of the paint resin, the paint film will turn green and discolor. Therefore, it is limited to 10%, which causes relatively little discoloration. In order to improve wear resistance, white alumina is added in an amount of 5 to 20 inches. The reason why the amount of undercoat applied was limited to 20 g/m WE 7 or more was based on experimental data in order to exhibit wear resistance performance. By limiting the particle size of the green silicon carbide and white alumina to 30 to 80 microns, there is no roughness on the surface of the paint film, and because the intermediate coat is applied to the base coat and the top surface is polished after drying, polishing goes smoothly and the top coat is fine. The adhesion of paint is also improved.

As an example, a normal natural wood veneer was pasted and colored decorative plywood was coated with an amino alkyd resin paint of 100 parts, a hardening agent of 10 parts, and a paint thinner of 10 parts, and an appropriate amount of green silicon carbide and white alumina. 20g of mixed primer paint
/m2, then apply 70g/m2 of intermediate coating that does not contain green silicon carbide or white alumina, and after the intermediate coating has hardened and dried, finish by polishing and apply 50g of normal topcoat.
/m2 coated wood decorative boards were prepared, and the number of rotations at which these wood decorative boards were worn was measured under the conditions of the "JAS R Abrasion A Test for Flooring" until the paint film peeled off and the colored layer began to discolor. , I got the results in the following table.

In the above table, it can be seen that in Example 4, the content of green silicon carbide was 15% and the particle size was 9 to 120 microns, causing roughness and discoloration on the surface of the coating film. In Example 5, since the particle size is 10 to 25 microns, the number of rotations until the coating film peels off is as low as 250 times. Example 1
In No. 3 to No. 3, the wear resistance improved as the content of white alumina increased.

As described above, the wood decorative board produced by the method of the present invention contains 10% green silicon carbide mixed in the undercoat, 5 to 20% white alumina, and a particle size of 30 to 80 microns, and the intermediate paint mixed in. By polishing and applying a top coat, it is finished as a decorative board with excellent wear resistance, without causing discoloration or roughness due to the paint film.
It has many remarkable effects, such as being able to be used for a long period of time as colored decorative floorboards and other decorative materials.

Commissioner of the Japan Patent Office Black 1) Mr. Kairi-11, Indication of the case 1985 Patent Application No. 302354 2, Title of the invention Method for manufacturing wood decorative laminates 3, Relationship with the amendment person case Patent applicant

Claims (1)

[Claims] 1. A natural wood decorative veneer is attached, and on the top surface of the colored decorative plywood, green silicon carbide with a particle size of 30 to 80 microns is applied at a weight ratio of 10% to the resin non-volatile content of a transparent or translucent undercoat, and the same particle size is applied. 5 to 20% white alumina
Apply an undercoat containing 20g/m^2WET or more,
A transparent or translucent intermediate coat that does not contain an abrasion resistant material such as green silicon carbide or white alumina was applied to the top of the base coat, and after the intermediate coat had dried, the top of the intermediate coat was polished and a top coat was applied. A method for producing a wood decorative board, characterized by: