JPH01257046A - Manufacture of fiber-reinforced resin molded body having macadam pattern - Google Patents

Abstract

PURPOSE:To manufacture efficiently a fiber-reinforced resin molded body having favorable surface feeling and a macadam pattern by a method wherein a macadam patterned sheet comprised of e transparent cured resin layer and transparent cured gel coat layer is fixed to a molding tool, to which colored curing gel coat solution is applied, a reinforcing fiber is laminated and the colored curing gel coat solution is cured. CONSTITUTION:A macadam patterned sheet comprised of a transparent curing resin layer where macadamlike particles and a short fiber are fixed and a transparent curing gel coat layer is fixed to a predetermined position of a molding tool so that the transparent curing gel coat layer abuts against a mold surface. A colored curing gel coat solution is applied to the whole surface of a mold surface, reinforcing fiber is laminated further, the colored curing gel coat solution is cured and a fiber-reinforced resin molded body having a macadam pattern is manufactured. Since the macadam patterned sheet obtained by coating the macadamlike particles with the transparent curing gel coat layer is used, the macadam pattern has stereoscopic effect, moreover, the macadamlike particles do not appear directly on the surface and surface feeling is favorable. Then molding of the macadam patterned sheet becomes possible and the title method is not restricted by molding tool for a molded body.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for manufacturing a fiber-reinforced resin molded article having a crushed stone pattern.

(Prior Art) In a fiber-reinforced resin molded body such as a bathtub with a washing area, a crushed stone pattern is sometimes applied to a part of the molded body, such as the washing base surface, for decoration.

Conventionally, fiber-reinforced resin molded bodies having this type of crushed stone pattern have been manufactured by the following method.

That is, after pasting a masking material on a predetermined part of the mold, that is, the part where the crushed stone pattern is to be formed, a colored curable gel coat liquid is applied to the entire surface of the mold, and while the gel coat liquid in step 4 has not hardened. The above masking material is peeled off from the mold surface.

Then, a transparent curable gel coat liquid is applied to this peeled part, crushed stone particles are attached to this, a colored curable gel coat liquid is applied to the entire surface, reinforcing fibers are further laminated, and these curable gel coat liquids are applied. After curing, the mold is demolded to obtain a molded body.

(Problem to be solved by the invention) The glass fiber reinforced molded article obtained by this method is
The crushed stone pattern has a three-dimensional effect and has a good decorative effect. However, a part of the crushed stone particles are fixed on the surface of the transparent cured gel coat layer, and as a result, the surface of the molded product has a rough feel, and there is a problem in the smoothness of the surface of the molded product.

In addition, a masking material is pasted on a predetermined part of the mold, and it is peeled off. Furthermore, a transparent curable gel coat liquid, crushed stone particles, and a colored curable gel coat liquid are sequentially applied and cured to form the mold. The problem is that it takes a long time and production efficiency is low.

The present invention is intended to solve the above-mentioned problems, and its purpose is to efficiently produce a fiber-reinforced resin molded article having a crushed stone pattern that has a three-dimensional appearance and has a good surface feel. The goal is to provide a way to do so.

(Means for Solving the Problems) A method for producing a fiber-reinforced resin molded article having a crushed stone pattern according to the present invention provides a crushed stone pattern consisting of a transparent cured resin layer to which crushed stone particles and short fibers are fixed, and a transparent cured gel coat layer. The sheet is fixed at a predetermined position in a mold so that its transparent hardened gel coat layer is in contact with the mold surface, a colored hardenable gel coat liquid is applied to the entire surface of the mold, and reinforcing fibers are further laminated to form the colored layer. It is characterized by curing a curable gel coat liquid, thereby achieving the above object.

(Function) According to the present invention, a crushed stone pattern sheet is used, which is composed of a transparent cured resin layer to which crushed stone particles and short fibers are fixed, and a transparent cured gel coat layer. Therefore, the crushed stone pattern has a three-dimensional effect, and the crushed stone particles are covered with a transparent hardened gel coat layer and are not exposed on the surface.

Further, according to the present invention, the crushed stone pattern sheet prepared in advance is fixed to a predetermined position of a mold and molded. Therefore, it becomes possible to mold the crushed stone pattern sheet in a separate process, and there is no restriction imposed by the mold for molding the molded object.

(Example) Embodiments of the present invention will be described below.

First, a mold for forming a crushed stone pattern sheet is prepared, and a transparent curable gel coat liquid is applied to the surface of the mold to a thickness of about 1 mm, for example, and cured. This transparent curable gel coat liquid consists of a resin liquid obtained by adding a thickener such as colloidal silica to a transparent curable resin liquid such as a transparent unsaturated polyester resin liquid to impart thixotropic properties.

Next, a transparent curable resin liquid is applied to the cured surface of the transparent curable gel coat liquid to a thickness of, for example, about 2111ffi. This transparent curable resin liquid is made of a resin liquid with low thixotropy such as a transparent unsaturated polyester resin liquid. Then, crushed stone-like particles having a particle size of about 3 mm or less, for example, are sprinkled on the surface to which the transparent curable resin liquid is applied. The crushed stone particles are made of crushed stone or particles equivalent thereto.

When dispersing the above crushed stone particles, the particle size is approximately 1 mm.
Divide into large particles with a particle size of about IIn or less and small particles with a particle size of about It is preferable to uniformly spread and even out the shaped particles over the entire surface. A portion of the scattered crushed stone particles sinks into the transparent hardening resin liquid. Continuing,
For example, short fibers such as glass fibers having a length of about 1 to 3 cylinders are uniformly scattered over the entire surface, and the short fibers are leveled so that they fit into the gaps between the crushed stone-like particles. These short fibers are mixed in to reinforce the resulting crushed stone pattern sheet and prevent shrinkage of the crushed stone pattern sheet, and the inclusion of these short fibers stabilizes the quality of the final molded product with the crushed stone pattern. Ru.

After the transparent curable resin liquid is cured, it is removed from the mold for forming a crushed stone pattern sheet to obtain a crushed stone pattern sheet. The obtained crushed stone pattern sheet consists of a transparent cured resin layer to which crushed stone particles and short fibers are fixed, and a transparent cured gel coat layer. Incidentally, embossing or small lattice-like grooves may be provided on the surface of the mold for forming the crushed stone pattern sheet, and embossing or small lattice-like grooves may be formed on the surface of the crushed stone pattern sheet.

Next, a mold for manufacturing a fiber-reinforced resin molded object such as a bathtub with a washing area is prepared.

Then, the crushed stone pattern sheet is fixed at a predetermined position of the mold so that the transparent cured gel coat layer is in contact with the mold surface. This fixing is carried out, for example, by using a piece of double-sided adhesive tape and sticking this double-sided adhesive tape piece to the end of the crushed stone pattern sheet and to the mold surface of the mold.

Thereafter, a colored curable gel coat liquid is applied to the entire surface of the mold, and reinforcing fibers are further laminated.

This colored curable gel coat liquid is colored by adding a desired coloring agent to the above-mentioned transparent curable gel coat liquid. Further, as the reinforcing fiber, a normal reinforcing fiber such as glass fiber is used.

After curing the colored curable gel coat liquid, the mold is demolded and the double-sided adhesive tape pieces are removed to obtain a fiber-reinforced molded product having a crushed stone pattern. In addition, if necessary,
A reinforcing layer or a backing layer such as plywood or a fiber-reinforced resin layer can be provided on the reinforcing fiber surface.

(Effects of the Invention) As described above, since the present invention uses a crushed stone pattern sheet in which crushed stone particles are coated with a transparent hardened gel coat layer, the crushed stone pattern has a three-dimensional effect, and unlike the conventional method, crushed stone particles are coated with a crushed stone pattern sheet. is not directly exposed on the surface and has a good surface feel.

In addition, since the present invention molds the crushed stone pattern sheet in a separate process, it is not limited by the mold for molding the molded object, and there is no need to use a masking material. The time required for molding can be shortened, improving production efficiency.

Claims (1)

[Claims] 1. A crushed stone pattern sheet consisting of a transparent cured resin layer and a transparent cured gel coat layer to which crushed stone particles and short fibers are fixed,
The transparent hardening gel coat layer is fixed at a predetermined position on the molding mold so that it is in contact with the mold surface, a colored hardening gel coat liquid is applied to the entire surface of the mold, reinforcing fibers are further laminated, and the above colored hardening gel coat is applied. A method for producing a fiber-reinforced resin molded article having a crushed stone pattern, which comprises curing a liquid.