JPH0233498B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing artificial marble, which involves spraying an unsaturated polyester resin colored to the extent that it is translucent to the color of the base of the artificial marble onto the inner surface of a mold 1 and curing it. to form a surface layer 2, and then, inside this surface layer 2, an unsaturated polyester resin opaquely colored in the color of the marble base is poured into the mold 1 and hardened. This relates to the manufacturing method.

Traditionally, when manufacturing artificial marble, the first
As shown in the figure, a transparent unsaturated polyester resin is applied inside the mold 1 and cured to form a transparent surface layer 2 made of gel coat, and then an inorganic fine powder filler is added to give it a marble-like color. By pouring a colored unsaturated polyester resin into a mold 1 inside the surface layer 2 and curing it, an artificial marble whose surface layer 2 is coated on the surface of an artificial marble body 3 is obtained. Here, the surface layer 2 is formed by the inorganic fine powder filler, which is filled in the artificial marble body 3, appearing on the surface to give the stone feel of marble and to obtain a reinforcing effect. This is to prevent the smoothness of the surface from being impaired. However, in such conventional examples, since the surface layer 2 is transparent, it is not possible to express the depth peculiar to marble, and
To form the surface layer 2, it is necessary to spray the unsaturated polyester and leave it for a while until it hardens, so dirt and dust may adhere to the inner surface of the surface layer 2 during this time. Dirt and dust would pass through the transparent surface layer 2 and appear on the surface of the artificial marble, potentially causing poor appearance.

The present invention has been made in view of the above points, and is an artificial marble that can give a deep natural marble feel and that does not cause any damage to the appearance even if dust or dirt adheres to the inside of the surface layer. The purpose is to provide a manufacturing method.

The present invention will be explained below with reference to Examples. First, a material mainly composed of unsaturated polyester resin is applied to the inner periphery of the mold 1 to a thickness of about 0.2 to 2.0 mm with a spray gun and cured to form the surface layer 2 of gel coat. At this time, the unsaturated polyester resin is colored by adding a small amount of a coloring agent having the color tone of the base of the artificial marble to be manufactured. The amount of the colorant added is adjusted to such an extent that the surface layer 2 becomes translucent due to curing of the unsaturated polyester resin.
After forming the surface layer 2 on the inner surface of the mold 1 in this way, a molding material of unsaturated polyester resin is poured into the mold 1 inside the surface layer. This unsaturated polyester resin molding material contains 100 to 100 parts by weight of inorganic fine powder such as calcium carbonate or aluminum hydroxide to 100 parts by weight of unsaturated polyester resin.
400 parts by weight, 0.2 to 2.0 parts by weight of a peroxide such as benzoyl peroxide as a catalyst, and an appropriate amount of other reinforcing materials as needed, and then color the base color of the artificial marble to be opaque with a coloring agent. It is obtained by adding an amount until it is mixed completely and mixing it completely, but it is colored with a different color for the pattern to express the streak pattern unique to marble, and is unsaturated by adding an appropriate amount of fine inorganic powder and catalyst. Add a small amount of polyester resin and stir the two gently to avoid breaking the streak pattern. By pouring and curing the unsaturated polyester resin prepared in this way as shown in FIG. 2, an artificial marble whose surface is covered with the surface layer 2 of the artificial marble main body 3 is obtained. The cross section is shown in FIG. 3, and the artificial marble main body 3, which is colored in the color of natural marble and has a marble-like striped pattern, is visible to the outside through the translucent surface layer 2.

As mentioned above, in the present invention, a surface layer is formed by spraying an unsaturated polyester resin colored to a translucent degree to match the color of the base of the artificial marble onto the inner surface of a mold and curing it. On the inside of the surface layer, an unsaturated polyester resin colored opaquely to match the base color of the marble is poured into the mold and allowed to harden, so the artificial marble has a surface layer colored translucently to match the base color. This allows the color pattern of the artificial marble to show depth, and since the surface layer is colored semi-transparently, dirt and dust do not accumulate on the inner surface of the surface layer. Even if they adhere, this dirt and dust can be prevented from appearing in the appearance, and the occurrence of appearance defects can be reduced.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional example, FIG. 2 is a sectional view of an embodiment of the present invention, and FIG. 3 is an enlarged partially cutaway sectional view of an artificial marble obtained from the above. 1 is a mold, 2 is a surface layer, and 3 is an artificial marble body.

Claims (1)

[Claims] 1 A surface layer is formed by spraying an unsaturated polyester resin colored to a translucent color to match the color of the artificial marble base onto the inner surface of the mold and curing it, and then molding is performed inside this surface layer. A method for producing artificial marble characterized by pouring an opaquely colored unsaturated polyester resin in the color of the marble base into a mold and allowing it to harden.