JPS63302002A - Method of laminating thrust board - 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 [Technical Field] The present invention relates to a method for laminating wood veneers used as surface materials for ceiling materials, wall materials, floor materials, etc.

[Background technology]

Conventionally, veneers made of wood have been used as surface materials for ceiling materials and the like, and these veneers have been laminated and bonded to the surface of adherends such as plywood. In this case, the veneer is impregnated with a synthetic resin and cured to improve the dimensional stability, strength, etc.
ation) treatment or impregnation with a flame retardant to improve M's flammability.

However, in the conventional method of bonding a WPC-treated veneer to an adherend, the rigidity of the veneer is increased by impregnating and curing synthetic resin, so it is difficult to bond the veneer to corners or curved surfaces of the adherend. In some cases, there was a problem in that cranks could not be generated at corners or the like.

Furthermore, when flame retardant treatment is performed together with the WPC treatment of the veneer, the amount of impregnated flame retardant is reduced by the amount of synthetic resin impregnated, making it difficult to improve the flame retardancy of the veneer.

[Purpose of the invention]

This invention aims to provide a method for laminating veneers that prevents cracks from forming on the veneer when it is adhered to an adherend, and also makes the veneer flame retardant and highly durable. That is.

[Disclosure of the invention]

The veneer lamination method of the present invention involves impregnating the veneer with an Al1-)-cyto-based inorganic material, and then laminating the veneer on the surface of an adherend coated with a synthetic resin adhesive. The method is characterized in that the inorganic material is cured at the same time as or after adhesion to the adherend by pressure.

As described above, according to the present invention, since the veneer is impregnated with an alkoxide-based inorganic material, the flame retardance and durability of the veneer can be improved. In addition, the veneer is bonded to the adherend while the inorganic material is uncured, and the inorganic material is cured at the same time or after adhesion, so it can be easily applied to corners and curved surfaces of the adherend without causing cranking. Can be glued.

FIG. 1 shows the state of adhesion of the veneer to the adherend in the method of this invention. In FIG. 1, ``■'' is a veneer impregnated with an alkoxide-based inorganic material, and this veneer is bonded from the side surface to the surface of the adherend 2 via a synthetic resin adhesive 3.

The veneer 1 is a wood veneer with a thickness of about 0.2 to 1.0 mm obtained by thinly slicing wood such as cypress or cedar. The alkoxide-based inorganic material impregnated into this veneer l has an alkoxy group (methoxy group, ethoxy group, etc.) in its molecule, such as silicon ethoxide, titanium propoxide, silicon methoxide, etc. . These can be cured by being hydrolyzed by heating at a temperature of 100 to 150°C and then causing a dehydration condensation reaction.

To impregnate the veneer l with an inorganic material, place the veneer in a vacuum pressure cooker and reduce the pressure inside the cooker, then soak the inorganic material in a liquid such as isopropylene alcohol. In addition to the vacuum pressure method in which a bottled inorganic material solution is poured into a pot and then pressurized, other divine impregnation methods such as the normal pressure method in which the solution is impregnated under normal pressure can be employed.

Further, as the adherend 2, for example, plywood such as plywood conventionally used for manufacturing decorative laminates can be used.
The material is not particularly limited. As the synthetic resin adhesive 3 applied to the surface of the adherend 2, thermosetting adhesives such as epoxy resin, phenol resin, urea resin, etc. can be suitably used. - To bond the veneer 1 to the adherend 2 by laminating it, the veneer 1 is impregnated with an inorganic material solution, and without drying, the veneer 1 is laminated on the surface of the adherend 2 coated with the adhesive 3, and pressure is applied. For pressurization,
A pressure of about 0.5 to 2 kg/c+Il is appropriate. At this time, if the adhesive 3 is a resin that cures at room temperature (for example, an epoxy resin), the veneer 1 is adhered to the adherend 2 while the veneer 1 is impregnated with an inorganic material solution and is not dried, and then heated. The veneer 1 is dried to completely harden the inorganic material.

On the other hand, if the adhesive 3 used is a thermosetting resin,
Nb, which is laminated and bonded by heating and pressing the veneer 1 to the adherend 2;
Drying of the veneer 1 and curing of the inorganic material impregnated therein are carried out simultaneously. After curing, if necessary, dry to inorganic +J
The remaining solvent contained in the I'4 solution and the synthetic resin adhesive 3 is evaporated.

In this way, since the inorganic material impregnated into the veneer 1 is cured at the same time as or after adhering the veneer 1 to the adherend 2, the veneer 1 does not become rigid when laminated onto the adherend 2. Therefore, the veneer 1 can be easily bent along the corner 2a (or curved surface) of the adherend 2 without causing any cracks.

Next, the method of the present invention will be explained in more detail with reference to Examples.

Example 1: A cypress veneer with a thickness of 0.5 mm was impregnated with an alkoxide-based inorganic material solution at 220 g/pot by a pressure injection method. This inorganic material solution is made by dissolving silicon ethoxide in isopropanol at a concentration of 20%.

On the other hand, 10% room temperature curing epoxy resin was applied as a synthetic resin adhesive to the surface and side surfaces of the 8 mm thick plywood (adherend).
After applying the coating at 0g/rrr, the veneer was stacked on top of the plywood in an undried state from the surface to the side, and a pressure of 1.
The veneer was heated under pressure at 0 kg/crM to simultaneously bond the veneer with the synthetic resin adhesive and harden the inorganic material within the veneer, and then heated at 100°C to remove the remaining solvent.
It was heated and dried for 30 minutes to obtain a decorative board.

Example 2: A decorative board was obtained in the same manner as in Example 1, except that silicon ethoxide dissolved in isopropanol at a concentration of 10% was used as the alkoxide-based inorganic material solution.

Example 3 A heat-curing epoxy resin was used as a synthetic resin adhesive at a coating amount of 00 g/rd, and the veneer was applied to the adherend at a pressure of 1.0 kg/c (A, at a temperature of 100°C). A decorative board was obtained in the same manner as in Example 1, except that the inorganic material T in the veneer was cured simultaneously with the adhesive.

Example 4: Application amount of heat-curable urethane resin instead of room-temperature-curable epoxy resin adhesive in Example]
00 g/r+? The surface and side surfaces of the adherend were coated with varnish 1, and an undried veneer impregnated with the same inorganic material as in Example 1 was laminated thereon, and a pressure of 1.0 kB/cm was applied at room temperature.
The veneer was adhered to the adherend by applying pressure using CT. Next, this material was heated at a temperature of 100° C. for 30 minutes to dry the veneer and harden the inorganic material within the veneer.

In these Examples 1 to 4, cranks were caught in the corners of the obtained decorative laminates (no cracks were observed). Then, after drying and curing, I laminated and glued it on plywood.
Some cranks were observed at the corners.

Further, the decorative boards obtained in Examples 1 to 4 were subjected to an M flammability test and a surface durability test. The results are shown in the table below. In the flame retardancy test, the test piece was heated with a burner for 5 minutes and the degree of combustion was visually judged. -, the durability is determined by the gloss residual rate (50
0 hours later) and evaluated.

In the table, the blank is one that was not impregnated with the alkoxide-based inorganic + A rice grain solution.

From the table, it can be seen that the decorative boards obtained in Examples 1 to 4 all have poor flame retardancy and durability.

[Effects of the Invention] According to the present invention, since the veneer is impregnated with an alkoxide-based inorganic dye, the flame retardance and durability of the veneer can be improved. In addition, the veneer is bonded to the adherend while the inorganic material is uncured, and the inorganic t1F4 is bonded at the same time or after bonding.
Since it cures, it can be easily bonded to corners and curved surfaces of adherends without causing cracks.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a state in which a veneer is laminated on an adherend in the present invention. 1-veneer, 2-adherent, 3-adhesive No. ''!

Claims (1)

[Claims] After the veneer is impregnated with an alkoxide-based inorganic material, the veneer is laminated and pressed onto the surface of an adherend coated with a synthetic resin adhesive, and the inorganic material is cured at the same time as or after adhering to the adherend. A veneer lamination method characterized by: