JPS58215316A - Forming method of surface pattern - Google Patents

Abstract

PURPOSE:To form a colorful pattern on the surface of a molded product, by applying the translucent colored gel coat layer of a colored acryl syrup on the face of a mold spottedly and applying an opaque colored resin layer entirely on it, then laminating a fiber reinforced plastic layer on its top face. CONSTITUTION:The translucent colored gel coat layer 3 composed of a colored acryl syrup is applied spottedly on the face 1a of a mold so as to become a proper spotted pattern, then the opaque colored resin layer 5 which is colored in the tone contrasted with said translucent colored gel coat layer 3 is applied entirely and it covers said gel coat layer 3. Then, a fiber reinforcing plastic layer 6 is integrally laminated on its top face. The colored pattern of a deep and real feeling can be shaped on the surface in the molding of a fiber reinforced plastic product by this.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a variety of patterns on the surface of a fiber-reinforced plastic (hereinafter referred to as FRP) molded product during molding.

BACKGROUND OF THE INVENTION Recently, wall materials, floor materials, etc., such as bathtubs or unit lotuses, are given a decorative appearance shape to their surfaces during molding.

Conventionally, the method of applying a surface pattern to this type of FRP molded product is to apply a thermosetting resin of high viscosity to the gel coated surface of the molded product, as shown in Japanese Patent Publication No. 48-4464. It was practiced to form patterns such as spots, polka dots, and ripples by applying them in descending order.

However, in this method of forming a surface pattern, the viscosity of the resin to be sprayed is adjusted and sprayed using a spray gun that matches the viscosity. Special spray equipment such as a spray can for messy yarn is required.

It has also been pointed out that the pattern formed on the surface is a so-called stringy pattern, which is somewhat different from the crack pattern 9, and that the pattern lacks depth and lacks a sense of realism and beauty. has been done.

The present invention aims to eliminate the drawbacks of the conventional coloring and patterning methods.The purpose of the present invention is to make it possible to add depth and realism to the surface pattern, and to eliminate the need for special spray guns, etc. It is something to do.

- In order to achieve the object described in F, the present invention uses a gel coat layer forming means to randomly apply a translucent colored gel coat layer made of colored acrylic syrup on the mold surface so as to form an appropriate pattern of cracks, and then apply the above-mentioned A method for forming a surface pattern on an FRP molded article is provided, in which an opaque colored resin layer colored in a color tone contrasting with a translucent colored gel coat layer is coated over the entire surface.

That is, the present invention utilizes the properties of an acrylic syrup containing a methyl methacrylate copolymer or a methyl methacrylate and an α,β-ethylenically inert saturated compound copolymer dissolved in the monomer methyl methacrylate. To provide a method for forming a surface pattern on an FRP molded product, in which a good crack pattern can be formed on the surface of the molded product by applying this as a gel coat layer to the surface to be painted by ordinary spraying means. An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1(a) shows an FRP mold 1 to which the present invention is applied. The mold surface 1a of this mold 1 is for forming the surface of a molded product which will be described later, and the order of molding an FRP molded product using this mold 1 will be described below.

(1) First, a mold release agent is applied onto the mold surface 1a, and a transparent gel coat layer 3 made of clear polyester or the like is formed on the mold release layer 2 by spraying or brushing. See Figure 1 (b)>.

As the composition of this gel coat sparrow 3, the following composition can be given.

Clear polyester 100 parts (parts by weight,
Same below) Cobalt naphthenate 0.5 parts Kayamec B (MIBKPO) 1.0 parts Aerosil (Japan Aerosil) 3.0 parts 2) Next, with the gel coat layer 3 having such a composition applied, as an intermediate layer A translucent gel coat@4 consisting of syrup containing methyl methacrylate is spray applied onto the transparent gel coat layer 3 (see FIG. 1(c)).

The methyl methacrylate-containing syrup constituting this translucent gel coat layer may be a methyl methacrylate polymer dissolved in the monomer methyl methacrylate or a combination of methyl methacrylate and an α,β-ethylenically inert saturated compound. It is a syrup containing a polymer, and in addition to this syrup, dyeing, @I' is mixed in, it is also possible to use a filling agent, etc., and a hardening agent can also be added to this composition. The translucent gel coat layer 3 is thereby cured on the transparent gel coat layer 2. Further, as the spraying means, a normal spraying means can be used, and a pattern of cracks can be formed according to the operation of the spray gun.

That is, in the above-mentioned acrylic syrup, the above-mentioned polymer dissolved in the methyl methacrylate is dissolved during spraying, and when the methyl methacrylate volatilizes and adheres to the above-mentioned transparent gel coat layer 2, which is the surface to be painted. A regular pattern of cracks can be formed, and a better pattern of cracks can be obtained using a conventional scattering gun compared to the Iζ spraying technique, and the method is cured in this state.

The following composition can be given as a specific composition of this material.

Acrylic syrup 10,000 parts Cohonyl 4F 2 2 Nippon Gosei Kagaku Kogyo) Acrylic monomer 20 to 50 parts Acryester M Pigment 2 to 1Q parts Hardening agent Parryoku Dox 16 3 parts (Nuri crude drug) (3> Next, the above translucent gel coat layer A colored gel coat layer 5 made of polyester resin or the like is coated on the surface of 4 by spraying or brushing (see Fig. 1(d)).The following composition can be given as an example of the composition of 4. .

Polyester resin 100 parts Aerosil
3.5-4.0 parts (Japan Aerosil) @Rice paste Q, =,, 3-0, 5 parts (
(100 parts of resin, 24 parts of pigment) The pigment mixed in the colored gel coat layer 5 should have a hiding property, and should be contrasted with the translucent colored gel coat layer 4 in lightness, saturation, and hue. This colored gel coat H5 hides the FRP layer, which will be described later, and forms a predetermined color pattern by combining these colors as the dark color of the surface pattern of the molded product formed by the translucent colored gel coat @4.

(4) Next, after applying the gel coat layer with the three-layer structure formed in this way onto the mold surface 1a, a matrix formed of ordinary glass cloth, glass mat, etc. is formed.
By laminating the RP layer 6, a predetermined pattern shape is formed on the surface of the FRP layer 6 as shown in FIG.
A molded body will be obtained.

Further, the FRP liJ 6 can be formed by a conventional molding method using a hand layer mold, a spray rough mold, or a cold press mold.

The surface pattern of the FRP molded product obtained in this way may have a single straight line or a meandering line depending on how the translucent colored gel coat layer 4 is formed by the operation of a normal spray gun. A pattern is formed in the form of a shape, branching, or a moderate curve, giving it an extremely designed appearance.
, it is possible to create a design shape similar to the natural state, which is the same as when using materials of the first class.

The one shown in FIG. 3 shows another embodiment of the present invention, in which the gel coat layer constituting the surface of the FRP layer 6 is coated with the above-mentioned translucent colored transparent gel coat @4 on the top layer.
is formed, and the lower part thereof has a double structure of an opaque colored gel coat layer 5 having a contrasting color tone, and even in this case, a design pattern is formed in the same form as above. As explained in detail in the embodiments above, the present invention can form F.
Depending on the method of forming the surface pattern of the RP molded product, as mentioned above, a composition consisting of acrylic syrup is spray applied to the middle layer or the top layer, so the applied surface pattern creates a designed shape in a random state. , it can be easily formed by a normal spray method without using a special gun as in the past. Further, according to the present invention, various random patterns can be applied to the surface of the molded product by operating the spray gun normally.

[Brief explanation of the drawing]

Figures 1 (a) to (d) are explanatory diagrams showing the manufacturing sequence of the method of the present invention; Figure 2 is an explanatory diagram showing a partially cross-sectional view of a molded product that can be applied to the same molding method; Figure 3; FIG. 2 is a partially cross-sectional explanatory diagram showing another embodiment of the present invention. 3...Translucent colored gel coat layer 5...
Opaque colored gel coat layer 6... FRP layer Patent applicant Nippon Ki Seizo Co., Ltd. Figure 1 (a) (b) 21a Figure 2 jIa Figure

Claims (1)

[Claims] (1) Formation amount In a fiber-reinforced plastic molded product formed by forming a gel coat layer on the mold surface of a mold that forms the surface, and then integrally stacking and molding a fiber-reinforced plastic layer on the gel coat layer, The above-mentioned gel coat layer is formed by applying a translucent colored gel coat layer made of colored acrylic syrup on the mold surface in a mottled manner to form an appropriate spot pattern, and then colored with a color tone that contrasts with the above-mentioned translucent colored gel coat layer. 1. A method for forming a surface pattern on a fiber-reinforced plastic molded product, characterized in that the surface pattern is formed by applying an opaque colored resin layer over one surface and concealing the gel coat layer.