JPH01200902A - Preparation of reinforced decorative board with emphasized grain - Google Patents

Abstract

PURPOSE:To prepare a reinforced decorative board with emphasized grain, in bonding veneer impregnated with a thermosetting resin to base plywood under heating and pressure to cure said resin, by preliminarily applying an org. dye to the adhesive of the veneer and the base plywood. CONSTITUTION:Veneer is held under a reduced pressure condition to exclude the air therein and subsequently immersed in an impregnation grade resin liquid composed of unsaturated polyester to inject said resin liquid in the veneer under pressure. A sealant based on aqueous vinyl urethane is applied to base plywood to be dried. Next, an adhesive containing a dye is applied to the sealant treated plywood and the resin injected veneer is subsequently placed on said plywood and the whole is cured under pressure to obtain a decorative board. After cooling and sanding, the decorative board to which urethane coating is applied is made sharp in the grain by the color dye.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a decorative board made of WPC (wood plastic combination), and more particularly to a method for producing a decorative board whose grain is strengthened or weakened.

(Prior art) In recent years, the so-called composite of wood and synthetic resin (W
PC) has become popular.

On the other hand, in recent years, as a way to enhance the quality of wood and give it an image of luxury, the grain of the wood has been strengthened or weakened. Methods for enhancing the heather grain include: ■ Applying a heather grain enhancer or heather highlighter that reacts with the nine fine components and pigments present in the wood; ■ Creating unevenness on the surface of the veneer by brushing, etc. Two methods are widely known: a method in which the recesses are colored darker than the convex portions, and (2) a method in which a dye is added in advance to the thermosetting resin liquid.

(Problem to be solved by the invention) However, when method (■) is used, the summer wood part becomes darker in color than the spring wood part and the heathered grain is emphasized, resulting in a disadvantage that the whole becomes darker in color. In the case of method (■), the spring wood part becomes a concave part and the summer wood part becomes a convex part, so the emphasized heather grain is reversed from the original heather grain, creating an unnatural heather grain. There were drawbacks. Furthermore, in the case of (2), there were disadvantages in that the grain was not very clear, and that adjustment tanks with different coloring formulations were required, or the impregnation pots had to be cleaned or a large number of pots were required.

Therefore, the inventors of the present invention have made extensive studies to solve these conventional drawbacks, and have found that, after impregnating the veneer with a thermosetting resin, the veneer is impregnated with a thermosetting resin, and then the vagina veneer is bonded to the base plywood by heat pressure curing. The inventors have discovered that it is possible to easily emphasize the grain by adding an organic dye or the like to the adhesive used to bond the veneer and the base plywood in advance, and have arrived at the present invention.

Therefore, an object of the present invention is to provide a simple method that can emphasize the grain of a decorative board.

(Means for Solving the Problems) The above-mentioned object of the present invention is to impregnate a veneer with a thermosetting resin liquid and then attach the veneer to a base plywood that has been sealed.
A method for producing a decorative board by curing the resin liquid under heat and pressure, wherein an adhesive containing at least one selected from organic dyes, organic pigments, and inorganic pigments is used as an adhesive between the veneer and the base plywood. This was achieved by a method for manufacturing reinforced decorative boards that emphasizes the grain.

The thermosetting resin that can be used in the present invention may be transparent or opaque after curing (for example, styrene, methyl methacrylate, diallyl phthalate, saturated or unsaturated polyester, melamine, phenolic resin, etc.). The thermosetting resin composition can be appropriately selected from resins commonly used for impregnated wood, unsaturated polyester containing a shrinkage reducing agent, and other known thermosetting resin compositions.

In the present invention, the method for impregnating the veneer with the thermosetting resin liquid can be appropriately selected from among known methods, but in particular, the air in the veneer tube is discharged by reducing the pressure, A method in which the veneer is immersed in a resin liquid and then pressurized to inject the resin liquid into the veneer tube is preferable because a large amount of the resin liquid can be impregnated into the veneer in a short period of time.

Conditions for heat-pressure curing during WPC conversion are appropriately selected and set from known conditions depending on the type of resin used.

The adhesive used to firmly bond the veneer and the base plywood during the heat-pressure curing process can be appropriately selected from known adhesives. Since it permeates into the board pipe when pressure is applied, it is preferable that it has good compatibility with the thermosetting resin that has been impregnated into the veneer in advance, from the viewpoint of easy permeation and less unevenness in the finish. . In this sense, in the present invention, at least the main components of the adhesive preferably match the main components of the thermosetting resin with which the veneer is impregnated in advance.

The organic dye and organic or inorganic pigment used in the present invention can be appropriately selected from known dyes and pigments. Dyes alone do not emphasize the grain sufficiently, and their light resistance is also inferior to that of pigments, so pigments with good light resistance are mainly used.
It is preferred to use dyes as subtle toning agents when necessary.

The base plywood used in the present invention must be sealed in advance (as will be described later). This is to allow it to move into the board.As this sealant,
Water-based vinyl urethane containing 10% Ti02, KR-137
Use a publicly known product such as (manufactured by Saki Sangyo).

(Function) According to the present invention (a veneer pre-impregnated with a thermosetting resin,
When it is attached to a base plywood via an adhesive and heated to cure the thermosetting resin under heat and pressure, the solution viscosity of the resin decreases until the polymerization reaction progresses to a certain extent. Therefore, the resin and the adhesive having good compatibility with the resin move with each other at the interface between the impregnated veneer and the colored adhesive, thereby emphasizing the grain.

In this case, the base plywood is sealed in advance, so the adhesive does not transfer to the base plywood, and when hardwood is used as the veneer, resins, dyes, and pigments transfer quickly. This effectively emphasizes the heathered grain.

Since the adhesive transfers into the veneer during heat-pressure curing is slight, in order to achieve the effect of heat-grained steel through this slight transfer, the thickness of the veneer should preferably be 2 mm or less, especially 1 mm or less. is preferred.

(Effects of the Invention) According to the present invention, there is no need for special operations such as brushing or special equipment for making the grain stronger, so the operation is simple and the manufacturing cost can be reduced.

EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited thereto.

Example: Place a 0.5 m/m thick oak flat plate under reduced pressure to evacuate the air in the flat plate, immerse it in an impregnating resin liquid of the following composition, pressurize it, and inject the resin liquid into the oak wood. did.

Unsaturated polyester smiatube T-812 (manufactured by Sansoku Kako ■)... 100 parts by weight Perbutyl 1
1 part by weight On the other hand, 20 g/2 squares of a filler having the following composition was applied onto a plywood substrate, and then dried at 60°C.

Water-based vinyl urethane KR-120 (manufactured by Hikari Sangyo ■)... 100 parts by weight AJ-1 (curing agent)... 10 parts by weight 'rio2 R-820.
... 20 parts by weight (manufactured by Ishiya Sangyo ■) After applying 16 g/2 squares of the adhesive of the following composition on the sealing treated plywood, the resin-injected flat plate was placed and heated at 130°C.
A decorative board was prepared by heat-pressure curing for 8 minutes under a heat pressure of 5 kg/cm 2 .

Sumiatsubu T-812...100 parts by weight Perbutyl l...0.5 parts by weight Bengara
After cooling 2 parts by weight, this was sanded with #240 paper and coated with urethane, resulting in a reinforced decorative material with extremely clear grains.

Claims (1)

[Scope of Claims] 1) Manufacture of a decorative board by impregnating a veneer with a thermosetting resin liquid, then adhering the veneer to a base plywood that has been sealed, and curing the resin liquid under heat and pressure. A method for reinforcing grains with emphasis, characterized in that an adhesive containing at least one selected from an organic dye, an organic pigment, and an inorganic pigment is used as an adhesive between the veneer and the base plywood. Method of manufacturing decorative board. 2) The method for manufacturing a reinforced decorative board with emphasized grains according to claim 1, wherein the basic composition of the adhesive is the same as the thermosetting resin liquid with which the veneer is impregnated. 3) The method for manufacturing a reinforced decorative board with emphasized grains according to claim 1 or 2, wherein the veneer is a hardwood veneer with a thickness of 2 mm or less.