JPH0234301B2 - JINZODAIRISEKINOSEIZOHO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for producing artificial marble that closely resembles natural marble.

[Background technology] In manufacturing artificial marble, conventionally, the first
As shown in the figure, a transparent gel coat layer 3 is first applied and cured on the inner surface of the molding recess 2 of the mold 1 by spraying or brushing, and then crushed natural stone particles or glass particles are coated on the unsaturated polyester resin. etc. maximum diameter
This was done by mixing solid particles of about 0.05 to 4 mm, pouring the mixture into the molding recess 2, and hardening it. In this case, the glass grains are used to express the crystal grain pattern unique to natural marble. However, it is impossible to express the sparkling feeling caused by the reflection of light on the crystal surfaces of natural marble with crystal grain patterns such as Sibetsu and Biancovenate. In other words, while the refractive index of unsaturated polyester resin is 1.55, the refractive index of glass grains is 1.57 and that of quartz grains is 1.55, which are similar, and the reflection of light on the surface of the particles mixed in unsaturated polyester resin. It is difficult for this to occur, and therefore it is not possible to express a crystal pattern with a sparkling feeling.

[Object of the invention] The present invention has been made in view of the above points, and an object thereof is to provide a method for manufacturing artificial marble that can express a sparkling feeling similar to the crystal grain pattern of natural marble. It is something to do.

[Disclosure of the invention] However, the method for manufacturing artificial marble according to the present invention is as follows:
After coating and forming a transparent gel coat layer 3 on the inner surface of the molding recess 2 of the mold 1, mica pieces 4, 4...
After that, unsaturated polyester resin 6 mixed with crushed stone 5 is poured into the molding cavity and hardened.
The above purpose was achieved through the action of
The present invention will be explained in detail below using examples.

First, a gel coat material such as an unsaturated polyester resin is applied to the inner surface of the molding recess 2 of the mold 1 using a spray gun or brush, and is cured to form a coating material as shown in Fig. 2a.
Transparent gel coat layer 3 with a thickness of 0.1 to 1.0 mm as shown in
form. Next, on this gel coat layer 3, flaky mica pieces 4, 4 each having a side size of about 0.1 to 3.0 mm are placed on top of the gel coat layer 3.
... are uniformly dispersed as shown in Figure 2b. Also,
A transparent unsaturated polyester resin 6 is mixed with crushed Kansui stone 5, 5... having a diameter of 0.05 to 3 mm at its largest part, and this resin liquid is poured into the molding recess 2 as shown in Figure 2c. Heat or naturally harden in a curing furnace. Here, the composition of the resin liquid is, for example, 100 parts by weight of unsaturated polyester resin, 100 to 400 parts by weight of crushed stone, 0.2 to 2.0 parts by weight of a curing agent, and 0.2 to 2.0 parts by weight of a curing accelerator such as cobalt naphthenate. It is preferable to mix 3 parts, and the diameter of the largest part is 3 parts.
A specific example of using crushed Kansui stone of mm is 100 parts by weight of unsaturated polyester resin, 250 parts by weight of crushed Kansui stone, and 0.4 parts of 6% cobalt naphthenate.
A resin liquid can be prepared by adding part by weight and 0.55 part by weight of a curing agent.

By demolding the molded product from the mold 1, it is possible to obtain the artificial marble A shown in FIG. Although it is similar to a saturated polyester resin, since the mica flakes 4 are formed by overlapping crystals in layers, when light transmitted through the gel coat layer is incident on the mica flakes 4, the angle of incidence is different from each layer of the mica flakes 4. As a result, total reflection occurs for light at almost all incident angles, and the crushed stone 5 of the kansui stone under the gel coat layer 3
It looks like the crystals (stone grain) of natural marble, and furthermore, the light reflection effect of the mica pieces 4 creates a sparkling crystal grain pattern. Therefore, it is possible to obtain artificial marble that is very similar to natural marble with a crystal grain pattern such as Sibetsk or Biancovenate. In addition, as a material having the same effect as the mica flakes 4, for example, an organic material flake or an inorganic material flake formed by overlapping extremely thin (about 1 to 10 μm) layers of polyethylene film or polypropylene film may also be used. This can be used together with the mica piece 4 or in place of the mica piece 4.

[Effects of the Invention] As described above, according to the present invention, it is possible to express a sparkle similar to the crystal grain pattern of natural marble due to the light reflection effect of the mica pieces, and it is possible to create an artificial marble that closely resembles natural marble. It is something that can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional example, FIGS. 2a, b, and C are sectional views of an embodiment of the present invention, and FIG. 3 is a sectional view of an artificial marble manufactured by the same method. 1 is a mold, 2 is a molding recess, 3 is a gel coat layer, 4 is a mica piece, 5 is crushed stone, and 6 is an unsaturated polyester resin.

Claims (1)

[Claims] 1 After coating and forming a transparent gel coat layer on the inner surface of the molding cavity of the mold, mica pieces are sprinkled on this inner surface,
A method for producing artificial marble, which is characterized in that an unsaturated polyester resin mixed with crushed Kansui stone is then poured into the molding cavity and hardened.