JPH0773901B2 - Method for producing artificial marble sheet and method for producing fiber-reinforced resin molded article using the sheet - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing an artificial marble sheet used for a fiber-reinforced resin molded product having an artificial marble pattern, and a method for producing a fiber-reinforced resin molded product using the sheet. It is about.

(Prior Art) In a fiber-reinforced resin molded product such as a bathtub with a washroom, a part of the molded product such as the floor of the washroom may be provided with a marble pattern for decoration.

Conventionally, a fiber-reinforced resin molded product having this type of artificial marble pattern is manufactured by the following method.

That is, after a masking material is applied to a predetermined portion of a molding die, that is, a portion where an artificial marble pattern is to be formed, a colored curable gel coat resin is applied to the entire surface of the die, and while the gel coat resin is not cured, The masking material is peeled off from the mold surface. Then, a transparent curable gel coat resin is applied to the peeled portion, crushed stone particles are adhered to the peeled portion, a colored curable gel coat resin is applied to the entire surface, and reinforcing fibers are further laminated to form a curable gel coat resin. After being cured, it is demolded to obtain a molded body.

(Problems to be Solved by the Invention) The glass fiber reinforced resin molding obtained by such a method has a three-dimensional appearance in an artificial marble pattern and a good decorative effect.

However, some of the crushed stone-like particles are fixed on the surface of the transparent cured gel coat resin layer, so that the surface of the molded body has a rough feel, and there is a problem in smoothness of the surface of the molded body.

In addition, a masking material is attached to a predetermined portion of the molding die, the masking material is peeled off, and the transparent curable gel coat resin is sequentially applied and cured, so that the molding time is long and the production efficiency is poor. There is a problem.

In addition, in the case of use as a floor in a washing place, there is a pattern with a grid-like uneven pattern in order to simulate a tile pattern, but since the joint part is not colored, it is a monotonous pattern overall. It has become.

The present invention solves the problems of the prior art as described above, the artificial marble pattern has a three-dimensional effect, is excellent in the design of joint patterns, etc., and has a good surface feel, and an artificial marble sheet using the sheet. The purpose was to provide a method for efficiently manufacturing the body.

(Means for Solving the Problems) The first aspect of the present invention is to provide a portion corresponding to a joint of a sheet molding die,
Apply a colored curable gel coat resin, apply a transparent curable gel coat resin on it with a spray gun, then heat cure with a mold, apply a transparent curable resin on the cured gel coat resin, The gist is a method for producing an artificial marble sheet, which comprises spraying crushed stones on the transparent curable resin, heating and curing again, and then demolding. The second aspect of the present invention is: The sheet described in 1.
The transparent cured gel coat layer with colored joints is fixed in place on the mold so that it touches the mold surface, the colored curable gel coat resin is applied to the entire surface of this artificial marble sheet, and the reinforcing fibers are further laminated. The gist is a method for producing a fiber-reinforced resin molded product having an artificial marble pattern, which is characterized in that the colored curable gel coat resin is cured.

(Operation) According to the first aspect of the present invention, the colored curable gel coat resin is applied to a portion corresponding to the joint of the sheet molding die, and the transparent curable gel coat resin is applied thereon by a spray gun,
After that, it is heat-cured together with the molding die, a transparent curable resin is applied on the cured gel coat resin, crushed stones are sprinkled on the transparent curable resin, and heat-cured again. In the department, crushed stones will be hidden,
Moreover, since it is colored, the joint portion has a distinctive pattern.

According to the second aspect of the present invention, the sheet according to claim 1 is fixed to a predetermined position of a molding die so that the transparent cured gel coat resin layer having a colored joint portion is brought into contact with the die surface, and the artificial marble sheet Apply colored curable gel coat resin on the entire surface,
Since a means for further laminating reinforcing fibers and curing the above colored curable gel coat resin is adopted, the artificial marble pattern has a three-dimensional effect, and the crushed stone particles are covered with the transparent cured gel coat resin layer and appear on the surface. Never.
Further, the above-prepared sheet is fixed and molded at a predetermined position of the molding die. Therefore, the artificial marble pattern sheet can be molded in a separate step, and is not restricted by the molding die.

(Example) Hereinafter, the Example of this invention is described with reference to drawings.

Example 1. First, as shown in FIG. 1, an artificial marble sheet molding die 1 was prepared, and a colored curable gel coat resin was applied to a portion 2 corresponding to a joint of a tile pattern on the bottom of the molding die 1. As shown in the figure, it was applied using a silk screen 3. In this way, as shown in FIG. 2, the mold 1 was provided with a coating surface in which the joints 4 were formed in a grid pattern. Subsequently, a transparent curable gel coat resin was applied to a thickness of about 1 mm by using a spray gun, and charged into a curing furnace together with a molding die and cured. Curing oven temperature is 50 ~ 60 ℃, heating time is 15 ~ 20
Minutes

This colored or transparent curable gel coat resin is composed of a transparent curable resin liquid such as a transparent unsaturated polyester resin liquid added with a thickener such as colloidal silica to give thixotropic properties.

Next, a transparent curable resin liquid was applied to the cured surface of the gel coat resin at a rate of 1,000 to 1,500 g / m ² by a method such as pouring from a coating roller or a bucket. This transparent curable resin liquid comprises a resin liquid having a low thixotropic property such as a transparent unsaturated polyester resin liquid. And
The following crushed stone composition was sprayed on the surface coated with this transparent curable resin liquid.

"Name of the pattern; white-gray-tone" i) Kanto-mikage ... 770g / m ² ii) White silica ... 500g / m ² iii) Gaishi-650g / m ² All particles with a particle size of 4mm or less were selected . The amount of spray was 1,500 to 2,500 g / m ² .

As the method of spraying, the above-mentioned composition was put into a rectangular sieve and then sprayed while sieving. Thus, a portion of the crushed lithic particles settled into the transparent curable resin.

Next, it was charged again in the curing furnace together with the mold and cured. The temperature of the curing oven was 50 to 60 ° C, and the heating time was 15 to 20 minutes.

Then, when the curing was completed, it was taken out of the curing furnace and released from the mold to obtain the artificial marble sheet of the present invention. The obtained artificial marble sheet was composed of a transparent cured resin layer having crushed stone particles adhered thereto and a transparent cured gel coat layer, and had a tile pattern in which joint portions were colored.

If embossing or grooves are formed in the portions corresponding to the joints of the sheet molding die, a more prominent joint pattern can be obtained.

In the second aspect of the present invention, the artificial marble sheet obtained through the above steps is prepared as a molding die for producing a bathtub with a washing place which is a fiber reinforced resin molded body, and the artificial marble sheet is The transparent cured gel coat layer was fixed at a predetermined position of the above-mentioned molding die so as to come into contact with the die surface.

This fixing was performed by using a double-sided pressure-sensitive adhesive tape piece and sticking the double-sided pressure-sensitive adhesive tape piece to the end portion of the artificial marble sheet and also to the mold surface of the molding die.

Thereafter, a colored curable gel coat resin was applied to the entire surface of this artificial marble sheet, and reinforcing fibers were further laminated.
As the colored curable gel coat resin, a resin obtained by adding a desired colorant to the above transparent curable gel coat resin and coloring it was used. Glass fiber was used as the reinforcing fiber.

Then, after curing the above colored curable gel coat resin, by removing the mold, by removing the double-sided adhesive tape piece,
A fiber reinforced molding having an artificial marble tile pattern was obtained.
If necessary, a reinforcing layer such as plywood or a fiber reinforced resin layer or a backing material layer may be provided on the reinforcing fiber surface.

Example 2. An artificial marble sheet and a molded body using the sheet were produced in the same manner as in Example 1 except that the following was used as the composition of the crushed stone composition.

"Name of the pattern; black granite" i) Black gasmi …… 360g / m ² ii) Canadian …… 1,200g / m ² iii) White silica …… 500g / m ² Any particle size less than 4mm is selected did.

The artificial marble sheet obtained in each of the above examples and the molded article produced using the sheet were satisfactory in terms of design and also excellent in quality.

(Effect of the invention) 1 of the present invention, in the portion corresponding to the joint of the sheet molding die,
A colored curable gel coat resin is applied, a transparent curable gel coat resin is applied thereon by a spray gun, and then heat-cured together with a molding die, and a transparent curable resin is applied on the cured gel coat resin. Since crushed stones are sprinkled on the transparent curable resin and heat-cured again, the crushed stones are hidden in the joints, and the joints are marked because they are colored. a.
Therefore, the surface of the molded product becomes smooth and the joints are colored, so that a pattern having an excellent design can be obtained.

According to the second aspect of the present invention, the artificial marble sheet is prepared by fixing the sheet according to claim 1 at a predetermined position of a molding die so that the transparent cured gel coat resin layer having a colored joint portion is in contact with the die surface. Since the colored curable gel coat resin is applied to the entire surface of the above, the reinforcing fibers are further laminated and the above colored curable gel coat resin is cured, the artificial marble pattern has a three-dimensional effect and the crushed stone particles are transparent. It is covered with a cured gel coat resin layer and does not appear on the surface. Further, the above-prepared sheet is fixed and molded at a predetermined position of the molding die. Therefore, the crushed stone pattern sheet can be molded in a separate step, and is not restricted by the mold for molding the molded body. Therefore, as compared with the conventional method, the surface smoothness is excellent, the time required for molding in the molding die can be shortened, and the production efficiency is improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a coating means of a joint portion using a silk screen used for carrying out 1 of the present invention, and FIG. 2 is the same as the above, showing a grid-like joint pattern on the bottom of a molding die. It is a perspective view showing the applied state. 1 ... Sheet forming mold, 2 ... Joint part, 3 ... Silk screen, 4 ... Applied joint pattern.

Continuation of the front page (56) Reference JP-A-63-239051 (JP, A) JP-A-56-77115 (JP, A) JP-A-56-133128 (JP, A)

Claims (2)

[Claims] 1. A colored curable gel coat resin is applied to a portion corresponding to a joint of a sheet molding die, a transparent curable gel coat resin is applied thereto by a spray gun, and then heat-cured together with the molding die, A method for producing an artificial marble sheet, characterized in that a transparent curable resin is applied onto the cured gel coat resin, crushed stones are sprinkled onto the transparent curable resin, the mixture is heated and cured again, and then demolded. 2. The sheet according to claim 1 is fixed to a predetermined position of a molding die so that the cured gel coat resin layer contacts the mold surface, and the colored curable gel coat resin is applied to the entire surface of the artificial marble sheet. A method for producing a fiber-reinforced resin molded product having an artificial marble pattern, further comprising laminating reinforcing fibers and curing the colored curable gel coat resin.