JPH0788087B2 - Natural stone tone resin molding - Google Patents

Description

TECHNICAL FIELD The present invention relates to a natural stone-like resin molded product.

(Background of the invention and problems to be solved) Natural stone-like resin moldings are widely used for counters, bathtubs and other applications.

Various studies have been conducted on this natural stone-like resin molded product, and much effort has been expended in order to obtain a color tone and aesthetics as close to natural stone as possible even though it is a resin molded product.

This natural stone-like resin molding is generally structured to have a base layer in which aggregate particles are dispersed in a matrix made of an unsaturated polyester resin, and a light-transmitting gel coat layer on the surface.

Conventionally, as a method of coloring the aggregate particles, a method of using water glass or linseed oil as a binder and coating the surface of the aggregate particles with a pigment by such a binder is known (Japanese Patent Publication No. Sho 62-22939).

This water glass has been widely used as a binder for coloring the powder surface with a pigment, but when such water glass is used as a binder, the following disadvantages occur.

When such water glass is used as a binder and the surface of the powder is colored with a pigment, the powder is treated with a mixture of starch syrup-shaped water glass and the pigment, and the post-treatment product is heated to a high temperature (about 1000 ° C). Although it will be treated to remove the solvent of water glass and vitrify it, since water glass needs to be treated at high temperature in this way, it is like that the aggregate contains crystal water. In some cases, for example, in the case of a commonly used cold water stone, the water of crystallization is released by heat treatment at high temperature, at which time the pigment film is broken, causing cracks and film peeling. .

Further, since the hard glass layer is formed on the surface of the aggregate, the resin molded product becomes hard and the workability in processing such as cutting becomes poor.

On the other hand, when flaxseed oil is used as the binder, it can be treated at room temperature and does not cause the above problems, but since flaxseed oil is an oil, it has poor solvent resistance and is an unsaturated polyester as a matrix. When the colored aggregate particles are dispersed therein, there arises a disadvantage that the pigment exudes into the polyester.

(Means for Solving the Problem) The resin molded product of the present invention has been devised to solve such a problem, and its gist is to perform a coloring treatment with a binder containing a resin and colloidal silica and a pigment. The colored aggregate particles thus obtained are dispersed in a matrix composed of an unsaturated polyester resin, and a surface gel coat layer is included.

(Operation and effects of the invention) Here, colloidal silica has a particle size of 1 to 100.
It is an extremely fine substance of about μm and forms a colloidal solution when dispersed in water.

When the aggregate particles are colored using a binder and a pigment formed by compounding such fine silica particles with a resin, the silica particles are present as a filler between the resins and form a gap of a micron unit there. To do. Further, such silica particles are interposed between the pigment and the resin and the aggregate particles, and the pigment,
It functions to increase the binding force between the resin and the aggregate particles.

Therefore, the pigment film strength and the film adhesion on the surface of the aggregate particles are increased, and the pigment film is not easily peeled off.

For example, when the aggregate particles are colored by using only the resin as the binder, if there is water, the film may be broken or peeled by the water, or the film of the pigment may be broken or peeled by expansion and contraction. On the other hand, when a composite material of resin and colloidal silica is used as the binder, such cracking or peeling of the film does not occur. This is because the gap of micron unit formed by colloidal silica forms a vent hole, and water vapor can escape to the outside through this vent hole (because it is not trapped inside), and also the pigment coating and the aggregate. This is because the difference in the amount of expansion and contraction with the particles is absorbed and relaxed by the silica particles interposed in the middle.

Moreover, in the case of the resin-composite binder composed of colloidal silica, it is not necessary to perform high temperature treatment as in the above-mentioned water glass, and since treatment at a relatively low temperature is possible, aggregate particles during heat treatment at high temperature, for example, There is no risk of rupture or peeling of the pigment coating due to the release of water of crystallization from the cold water stone.

Further, unlike the water glass, the pigment coating on the surface of the aggregate is not hardened, so that the workability at the time of processing the resin molded product such as cutting is not deteriorated.

The pigment coating on the surface of the aggregate colored according to the present invention is excellent in solvent resistance due to the function of silica particles. Therefore, when the colored aggregate particles are dispersed in the matrix unsaturated polyester, the problem of the pigment bleeding into the matrix does not occur.

In the present invention, various resins can be used as the binder resin, but when a styrene acrylic ester copolymer resin is used as the binder resin, that is, the aggregate particles are styrene acrylic ester copolymer resin emulsion and colloidal silica. It has been confirmed that particularly good results can be obtained when a coloring treatment is carried out with a mixed solution of a pigment and a pigment.

In the resin molded product of the present invention, it is possible to appropriately mix other particles together with the colored aggregate in the base layer. In particular, when aluminum hydroxide particles are added and blended, the effect of aluminum hydroxide particles having a refractive index close to that of unsaturated polyester resin deepens the transparency of the resin molded product, and the resin is closer to the color tone and aesthetics of natural stone (Onyx). The advantage is that a molded body is obtained.

In the present invention, as aggregate particles, crushed particles of natural stone, glass powder, calcium carbonate powder, and other particles can be used as appropriate.

Further, the resin molded product of the present invention may have other layers in addition to the gel coat layer and the base layer, and additives other than the above examples can be appropriately added.

(Example) Next, in order to further clarify the characteristics of the present invention, an example thereof will be described in detail below.

[Example 1] Using the following binders, calcium carbonate particles having an average particle diameter of 0.8 mm were colored black and the colored state was observed. The results are shown in Table 1.

[Binder] (a) Water glass (b) Linseed oil (c) Styrene acrylate ester copolymer resin aqueous emulsion (d) Styrene acrylate ester copolymer aqueous emulsion + colloidal silica In the case of using water glass as the binder, the calcium carbonate particles were cracked when the drying treatment was performed at a high temperature, and the white color of the calcium carbonate itself appeared, so that the coloring could not be performed well.

[Example 2] A powder colored black using the above binders (a) to (d) was immersed in a liquid of an unsaturated polyester resin for 1 day, and then stirred with a glass rod to change the liquid state. I observed. The results are shown in Table 2.

From these results, it is understood that the one using the binder (d) is good.

[Example 3] 100 parts of calcium carbonate having an average particle diameter of 0.8 mm, inorganic pigment: 0.5 to 100 parts, and the binder of (d): 3 to 6 times were mixed, and the mixture was stirred and dried (400 C) to obtain colored particles. Then, using the colored particles, a counter was manufactured at a blending ratio shown in Table 3 below.

This resin counter had a beautiful color tone and appearance similar to the black shadow.

Although the embodiment of the present invention has been described in detail above, this is merely an embodiment of the present invention, and the present invention is configured in a form in which various modifications are made based on the knowledge of those skilled in the art without departing from the spirit of the present invention. It is possible to

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuichi Hayashi 3-6, Koiemotocho, Tokoname City, Aichi Prefecture Inax Co., Ltd. (72) Inventor Satoshi Saka 3-6, Koiemotocho, Tokoname City, Aichi Inax Co., Ltd. Within

Claims (3)

[Claims] 1. A base layer in which colored aggregate particles obtained by coloring with a binder containing a resin and colloidal silica and a pigment are dispersed in a matrix composed of an unsaturated polyester resin, and a surface gel coat layer. Natural stone-like resin molded product characterized by: 2. The natural stone tone resin molded product according to claim 1, wherein the colored aggregate particles are colored with a mixed liquid of a styrene acrylic acid ester copolymer resin emulsion, colloidal silica and a pigment. . 3. The natural stone-tone resin molded product according to claim 1, wherein aluminum hydroxide particles are dispersed in the base layer.