JPS5847983B2 - Exterior decorative board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is based on a substrate (on which a phenol resin emulsion type adhesive is applied, and a pattern is printed on the surface of phenol resin-impregnated paper in advance, or after the pattern is printed on the surface). This invention relates to an exterior decorative board in which resin-coated decorative paper impregnated with phenolic resin is laminated and then heated and pressed to be integrated with a substrate.

Conventionally, exterior decorative boards with this type of pattern were made by sanding the surface of a wooden or inorganic substrate to improve the strength and adhesion of the substrate.
The base surface is treated, and then a pattern is applied directly to the substrate using acrylic resin or urethane resin ink using a gravure offset method, etc., and a resin coating is generally applied to protect the surface. In some cases, phenolic resin-impregnated kraft paper was hot-pressed and bonded to a substrate using a phenolic resin adhesive, and then a printed pattern and surface coating were applied directly to the surface.

As mentioned above, if phenolic resin-impregnated paper is not used, the resin layer is formed directly on the substrate I, which tends to cause problems such as cracks, cracks, and warping during use, and it is not possible to obtain beautiful printed patterns. Ta.

In addition, when using some phenol resin-impregnated kraft papers as described below, the process of adding the picture pattern is performed by a gravure offset method after hot pressing, so when gravure printing is performed directly on the phenol resin-impregnated kraft paper. Compared to this, I could not obtain anything clear and beautiful.

In addition, phenolic resins generally have high heat resistance, weather resistance, mechanical strength,
Although it has excellent electrical properties, the resin itself is colored reddish-brown, so when it is bonded to a substrate using a phenolic resin-based water-based adhesive, the phenol resin oozes out and the adhesion of the coating film is impaired. It had the disadvantage of being bad.

The present invention was made in view of these drawbacks, and eliminates the drawbacks of conventional exterior decorative laminates.The present invention will be described in detail below.

As the substrate used in the present invention, inorganic substrates such as veneer plywood (type "■") or special asbestos cement board are suitable.

Kraft paper with a weight of 80 g/rrr' to 180 g/m'' is impregnated with 30 to 50 layers of phenolic resin.The surface of the impregnated kraft paper is treated with an appropriate urethane sealer, and then acrylic or urethane resin is applied as a base polymer. A desired pattern is printed using a gravure ink using a gravure printing machine or the like.

After that, the substrate and the patterned phenol resin-impregnated kraft paper were heated and pressed using a hot press using a phenolic resin emulsion type adhesive with large dispersed particles (particle size 1 to 2 μm). and integrate it.

Next, double sawing is performed, and groove processing is performed, as well as actual processing is performed on both sides as necessary. After the surface is polished, a top coat is applied with acrylic or urethane resin, etc., to obtain an exterior decorative board.

Also, if a pattern is applied to the phenolic resin-impregnated kraft paper in the pre-hot pressing process and then the top coat is applied, the paper is similarly integrated by heating and pressing using a phenolic resin emulsion type adhesive. Obtain an exterior decorative board.

In this case, groove machining and actual machining are performed in the post-process as necessary.

As an adhesive, the particle size of the phenolic resin emulsion is large, so it does not bleed through the fiber gaps of the phenol resin-impregnated kraft paper. Adhesives are also possible, but they have disadvantages such as water resistance and weather resistance compared to phenolic resin emulsion type adhesives.

The present invention will be explained below based on examples.

Example 1 Basis weight 120. ! A phenolic resin-impregnated kraft paper was prepared by impregnating 9/m' unbleached kraft paper with phenolic resin at a concentration of 40%.

After that, the surface of the phenol resin-impregnated kraft paper was treated with 15 g of urethane resin as a sealer, and then a pattern was printed using a gravure printing machine using acrylic/urethane resin printing ink with good weather resistance. was granted.

Next, a phenolic resin emulsion type adhesive was applied onto the substrate at a rate of 54 g/rn', and then the patterned phenol resin-impregnated kraft paper was placed on top of the substrate, and the adhesive was heated and pressed to form an integral piece.

The hot press conditions are 150℃, 10kg/d and 7
It was heated and pressurized for several minutes.

The heated and integrated product was subjected to groove processing and final processing, and then a top coat of 12977I using acrylic, urethane, and lacquer resin was applied to obtain an exterior decorative board.

Example 2 A pattern was applied to phenolic resin-impregnated kraft paper in the same manner as in Example 1, and then a 13E//tri' topcoat was applied with acrylic/urethane/lacquer resin, and then a phenolic resin emulsion with large dispersed particles was applied. The mold was heated and pressed with the substrate using a hot press machine under the same conditions as in Example 1 to form an integral body using a mold adhesive to obtain an exterior decorative board.

The exterior decorative board of the present invention has a clear and beautiful design effect that has not been seen before, and furthermore, it does not bleed out from the reddish-brown phenol resin and has high performance without problems such as cracks, cracks, and warping. , is a high quality exterior decorative board, and is extremely effective in practical terms.

Claims (1)

[Claims] 1 After applying a printing pattern to paper impregnated with phenolic resin, it is integrated with a substrate by heat and pressure using a phenolic resin emulsion type adhesive with large dispersed particles, and then the surface is coated with resin, or The surface of the phenolic resin-impregnated decorative paper with the printed pattern before being integrated with the substrate is coated with resin, and then heated and pressed using a phenolic resin emulsion type adhesive with large dispersed particles. An exterior decorative board characterized by being integrated with a substrate.