JP2019166755A - Method for manufacturing artificial marble molding - Google Patents

Abstract

To provide a method for manufacturing an artificial marble molding capable of efficiently providing a light shielding layer with an excellent adhesiveness on the back surface of the body of the artificial marble molding.SOLUTION: A method for manufacturing an artificial marble molding 10 provided with a light shielding layer 12 on the back surface of an artificial marble molding body 11 with a low shielding property includes a procedure in which a resin composition 21 being a material of the artificial marble molding body 11 is injected into a mold 30 and heat-molded after a light shielding coating 22 is applied on the inner surface of the mold 30.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for producing an artificial marble molded article.

  Conventionally, artificial marble has been proposed in various ways to provide a light shielding layer on the back surface in order to solve the problem that the material bonded to the back surface can be seen through (see, for example, Patent Document 1). In the technique disclosed in Patent Document 1, a light shielding layer is formed as a coating film on the back surface of a resin molded product body (surface member) by painting.

JP 2006-248013 A

  However, in the above-mentioned literature technology, there is a risk that the production efficiency may decrease due to an increase in the number of processes. Moreover, since it is set as the procedure of adding a light-shielding layer after mold-molding the resin molded product main body, it cannot be said that the adhesiveness of both can be made favorable. In addition, in the same document, there is a description that the surface member and the light shielding layer can be integrally formed in order to increase productivity, but there is no disclosure of a specific method.

  The present invention has been proposed in view of such circumstances, and its purpose is to provide an artificial marble molded article that can efficiently and closely provide a light shielding layer on the back surface of the artificial marble molded article body. It is to provide a manufacturing method.

  In order to achieve the above object, a method for producing an artificial marble molded product of the present invention is a method for producing an artificial marble molded product in which a light concealing layer is provided on the back surface of a low concealment artificial marble molded product body, After coating a light-shielding paint on the inner surface of the resin, a resin composition forming the material of the artificial marble molded product body is injected into the mold and heat-molded.

  Since the manufacturing method of the artificial marble molded article of the present invention is the above-described procedure, the light hiding layer can be provided efficiently and with good adhesion on the back surface of the artificial marble molded article main body.

It is a figure which shows an example of the manufacturing method of the artificial marble molded product which concerns on one Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. First, an outline of the basic procedure will be described.

  The manufacturing method of the artificial marble molded product (hereinafter abbreviated as “molded product manufacturing method”) is a manufacturing method of the artificial marble molded product 10 in which the light concealing layer 12 is provided on the back surface of the artificial marble molded product main body 11 with low concealment. It is. This method for manufacturing a molded product includes a procedure of applying a light-shielding paint 22 to the inner surface of a mold 30 and then injecting a resin composition 21 constituting the material of the artificial marble molded product body 11 into the mold 30 and performing heat molding. Is done.

  The artificial marble molded product body 11 is formed by curing a resin composition 21 in which a synthetic resin as a main component is mixed with a filler, a curing agent, a coloring agent, a patterning agent, and other additives. The synthetic resin is not particularly limited as long as it is a resin having light transmissivity (lower concealment than the light concealment layer 12 described above), and may be appropriately selected according to the use of the artificial marble molded article 10 and the like. .

  Examples of the synthetic resin include thermosetting resins such as vinyl ester, unsaturated polyester, epoxy, acrylic, and melamine, and thermoplastic resins such as polymethyl methacrylate, polycarbonate, and polyethylene terephthalate. These may be used alone or in combination of two or more.

  As the filler, inorganic materials such as calcium carbonate, glass powder, silica, and calcium hydroxide, which are generally used for manufacturing artificial marble, can be employed. Further, surface treatment may be performed as necessary.

  The curing agent may be various ones such as organic peroxides generally used in the production of artificial marble, for example, selected in consideration of the half-life temperature according to the required molding temperature of artificial marble can do.

  Moreover, what is necessary is just to select a coloring agent, a pattern agent, and another additive suitably according to the use etc. of artificial marble.

  The light-shielding coating material 22 may be any coating material that can be cured in the mold 30, and for example, acrylic, urethane, silicon, and epoxy coatings are used. In particular, a thermosetting paint can be suitably used.

  Next, details of the method for manufacturing the molded article shown in FIG. 1 will be described.

  First, the light-shielding paint 22 is applied to the upper surface of the lower mold 32 in the mold 30. The mold 30 has a lower mold 32 corresponding to the shape of the target artificial marble molded product 10. For example, a flat plate having a lower mold 32 inside a pair of opposed plate members can be used. In addition, as a casting method using the mold 30, a method of casting and polymerizing into a desired shape using a metal, a resin, or the like as a material can be used.

  The part to which the paint 22 is applied may be either the upper mold 31 or the lower mold 32 as long as it is in the mold 30, but it is desirable to apply to the lower mold 32 for efficient application. The inner surface of the mold 30 to which the paint 22 is applied may be either a female mold or a male mold.

  As a method for applying the coating material 22, for example, painting with a spray 35 or painting with a roller 36 can be selected, but it is more desirable to paint with the roller 36. Although the film thickness of the coating material 22 can be adjusted according to the target concealment rate, it is desirable that the thickness be 10 μm or more and 1 mm or less without affecting the thickness of the molded artificial marble body 11. Further, it is desirable that the coating is preferably performed to a thickness of 50 μm or more and 200 μm or less to such an extent that the light shielding layer 12 does not peel off and can further function as the light shielding layer 12.

  Moreover, as the coating material 22, what is hardened | cured by heating for 5 to 30 minutes at the temperature of 40-100 degreeC is desirable, but it is not restricted to this. The heating method is not particularly limited, and a known method such as a method of heating with a heat source such as hot air, hot water, or an infrared heater is employed. In the case of the illustrated example, the temperature of the coating material 22 is adjusted so as to be in a semi-cured state at a temperature of about 50 ° C. when the resin composition 21 is injected.

  Thereafter, the resin composition 21 is poured into the mold 30 and molded between the upper mold 31 and the lower mold 32. For example, the resin composition 21 is preferably cured by heating at a temperature of 50 to 110 ° C. for 30 to 150 minutes. In the case of the illustrated example, the resin composition 21 is heated from 50 ° C. to 90 ° C. to be cured.

  In the process in which the resin composition 21 is cured, the resin composition 21 and the cured coating 22 (coating film 22) are in close contact with each other. Then, when the resin composition 21 is cured in the mold 30 and the cured resin composition 21 is taken out from the mold 30, the closely attached coating film 22 is taken out from the lower mold 32. Thus, the artificial marble molded product 10 having the light hiding layer 12 on the back surface of the resin composition 21 (artificial marble molded product main body 11) is obtained.

  Thus, since the resin composition 21 and the paint 22 are in close contact with each other while being cured in the mold 30, the light shielding layer 12 is firmly formed on the back surface of the artificial marble molded body 11. can do.

  When the paint 22 is semi-cured, there is a high possibility that irregularities are formed on the surface of the paint 22 by injecting the resin composition 21. Therefore, if the resin composition 21 is poured into the mold 30 when the paint 22 is in a semi-cured state, the contact area increases and the adhesion between the resin composition 21 and the paint 22 increases. And the resin composition 21 (artificial marble molded product main body 11) and the coating film 22 (light shielding layer 12) form a strong fixed relationship. Further, if a thermosetting coating 22 is used as the light-shielding paint 22, a crosslinking reaction is caused by curing, the crosslinking density is increased, and the resin composition 21 is more firmly adhered.

  Further, according to the above-described molded product manufacturing method, the light concealing layer 12 is not retrofitted to the cured artificial marble molded product body 11, but the artificial marble molded product body 11 and the light shielding layer 12 are made of the same gold. It can be formed integrally in the mold forming process. Therefore, according to this molded product manufacturing method, it is possible to efficiently manufacture the artificial marble molded product 10.

  In the artificial marble molded product 10 having the light concealing layer 12 on the back surface of the artificial marble molded product body 11 formed as described above, the lower part of the artificial marble molded product 10 can be seen through the light concealing layer 12 from the front side. This can be prevented. This artificial marble molded product 10 can be used, for example, for a bathtub, a wash basin, a top plate of a kitchen counter, or the like.

10 Artificial marble molded article 11 Artificial marble molded article body 12 Light hiding layer 21 Resin composition 22 Light hiding paint (coating film)
30 Mold
31 Upper mold 32 Lower mold 35 Spray 36 Roller

Claims (3)

A method for producing an artificial marble molded article in which a light concealing layer is provided on the back surface of a low-concealment artificial marble molded article body,
A method for producing an artificial marble molded article, comprising: applying a light-shielding paint to the inner surface of a mold; and then injecting the resin composition forming the material of the artificial marble molded article body into the mold to perform heat molding. . In claim 1,
The method for producing an artificial marble molded product, wherein the light-hiding paint is a thermosetting paint. In claim 1 or 2,
A method for producing an artificial marble molded article, characterized in that the light-shielding paint is semi-cured when the resin composition is injected into the mold.

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