JPS6054801A - Manufacture of decorative 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 The present BA relates to a method for manufacturing decorative boards used as interior and exterior materials for houses. Generally, decorative boards such as plywood are manufactured by laminating a decorative material impregnated with a synthetic resin liquid to a base material in order to improve the abrasion resistance, impact resistance, weather resistance, and aesthetic appearance of the surface layer. In this case, the decorative material impregnated with synthetic resin becomes translucent and the hue of the base material becomes visible, so to avoid this, pigments are conventionally mixed into the adhesive.
However, when hiding the hue of the base material by intervening a pigment or other concealing material in the adhesive, heat and pressure damage can occur. There is a problem in that a uniform hiding effect cannot be obtained due to localized flow of the solvent or solvent vapor during curing. Incidentally, if the decorative material is thick, even if it is impregnated with a synthetic resin liquid to make it translucent, the opacity will still be high, so the concealment unevenness of the adhesive will not be as noticeable. However, as the decorative material becomes thinner and its transparency becomes higher, the above-mentioned concealment unevenness becomes more noticeable, causing a problem. In particular, when a decorative board with a thickness of 0.35 m+ or less is injected with unsaturated polyester resin to make it translucent, the opacity usually becomes 0.8 m or less.

In this case, the above-mentioned concealment unevenness becomes very noticeable, impairing the appearance and significantly reducing the commercial value of the decorative board.

In the current situation where wood resources are being depleted, it is necessary to make decorative veneer as thin as possible in order to use it effectively.The above-mentioned concealment unevenness is one of the technical issues.

On the other hand, looking at the method of intervening colored sorting instead of the method of mixing pigments, etc. into the adhesive, titanium paper is generally used as the colored sheet, but the paper spacing of this titanium paper is Since the strength of the wood and the cohesive force of the adhesive are lower, the surface peel strength of the product decreases, and there is a problem that the decorative material on the surface peels off from the colored sheet part during the boiling test. For this reason, diallyl phthalate-impregnated paper or the like may be used instead of titanium paper, but the actual situation is that none of these methods can be said to be a sufficient solution since the product cost is high. The present invention eliminates all the drawbacks of the above-mentioned prior art), and consists of a base made of a decorative wood veneer impregnated with a synthetic resin liquid and having an opacity of 0.8 or less, uniformly colored as required. It is characterized by being attached to the surface with an adhesive without the presence of a concealing material.

The present invention will be explained in detail below along with Examples and Comparative Examples. The present invention is directed to a wood decorative board impregnated with a synthetic resin liquid and having an opacity of 0.8 or less. The synthetic resin liquid may be one commonly used for manufacturing decorative laminates, such as unsaturated polyester resin. Furthermore, the materials for decorative veneers include pine, cypress,
It can be applied to both broad-leaved and coniferous trees such as zelkova. Next, use a decorative veneer with an opaque FJA degree of 08 or less. This is because, as mentioned above, when the opacity is 0.8 or less, uneven concealment occurs significantly. On the other hand, the surface of the base material is colored uniformly if necessary, and a pretreatment f is performed so that the hue of the base material surface is not noticeable when the decorative veneer is pasted together. As a pre-treatment agent, a general paint for wood materials such as aminoalkyd resin or polyurethane resin, colored with titanium white, Bengara, organic dye, etc., is used depending on the purpose.

The amount of application varies depending on the purpose and type of colorant, but it is 8 to 3
0 P/R2 is preferred. J: A bonded and impregnated flat plate with no concealing material is placed under tension on the surface of the base material. There are no restrictions on the adhesive as long as it has excellent interfacial adhesion with the pretreatment agent, but colorless and transparent BAl is preferred.

The amount of application varies depending on the type of adhesive, etc., but it is 5 to 20 f.
/B2 is preferred. Through the above manufacturing process, it is possible to obtain a decorative decorative board that is free from uneven concealment and has a natural blank space with a deep, three-dimensional color tone.

Next, Examples and Comparative Examples of the present invention will be shown.

Example 1 A 0.3% thick straight-grained board was immersed in an impregnated resin solution prepared by adding 1.0 parts by weight of benzoyl peroxide as a reaction initiator to an unsaturated polynisder resin under a pressure of 20 Ky/- for 3 hours. A resin-impregnated veneer with a weight ratio of 120 cm was obtained. This is 13
Heat cured at 0 C, 10Ks +/- 8 minutes, Tappi
When the opacity was measured using the method, it showed 062. This was mixed with 15 f/amino alkyd paint containing 5 parts by weight of titanium white.
After applying R2, dry at 50℃ for 30 minutes, then apply 80C to white 12X thick coated plywood using a water-based vinyl urethane adhesive.
, 7K9/cf1.6 minutes. The resulting decorative board was beautiful, with uneven color and deep natural heather grain.

Comparative Example 1 The same translucent decorative veneer as in Example 1 was adhered to a 12% thick lauan plywood using a water-based vinyl urethane adhesive containing 5 parts by weight of titanium dioxide.

The obtained decorative board had color unevenness due to uneven flow of the adhesive, and the appearance was significantly deteriorated.
When the same impregnating resin solution was injected and cured, the opacity was 0.92. This was attached to 12% thick lauan plywood using a water-based vinyl urethane adhesive containing 5 parts by weight of titanium dioxide.

In addition, the obtained decorative board exhibited a leaf pattern with no uneven color.

Patent applicant: Sanyo Kokusaku Valve Co., Ltd. Agent: Patent attorney: Shibu Mitsuishi (1 other person)

Claims (1)

[Claims] A wooden decorative veneer impregnated with a synthetic resin liquid and having an opacity BAt of 0.8 or less is laminated with an IA adhesive without a concealing material on the surface of the base material, which is uniformly colored as required. Manufacturing method of decorative plate as a sign