JPS6336931B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a method for molding FRP (fiber reinforced plastics) that makes it possible to create natural stone-like patterns on the surface of a molded product, in which the surface gel coat layer is colored with a translucent layer. By coating the two layers and stirring and mixing both layers in a pattern, it is possible to enhance the sense of reality and improve productivity.

Conventionally, when molding this type of FRP, for example, an FRP bathtub, a gel coat layer, which serves as a decorative surface layer, is applied to the mold surface of the mold, and an FRP molding material, which serves as a back-up layer, is applied on top of the gel coat layer using the hand lay-up method. They are laminated and hardened using methods such as the following.

However, when applying patterns to such molded products, conventionally, the gel coat layer was simply colored in an appropriate color, or the pattern-printed fiber reinforcement material was impregnated with transparent liquid synthetic resin to form FRP. This is done by lining it.

However, with the conventional patterning means described above, in the former case, the molded product only exhibits a single color tone, and in the latter case, it is necessary to print on reinforcing fibers, and moreover, in the case of the former, the molded product exhibits only a single color tone. In molded products, the patterns at the seams of the reinforcing fibers are irregular, giving an artificial and unnatural appearance, and the seams themselves or the reinforcing fibers themselves also appear as patterns. There were various problems such as the shape being limited to simple shapes.

The present invention aims to eliminate the above-mentioned conventional drawbacks, and will be described below based on the illustrated embodiments.

As shown in FIG. 1, numeral 1 in the figure is an FRP molded product, for example, a bathtub body, which is formed through a molding process that will be described later. The bathtub body 1 has a cross-sectional structure in which a gel coat layer 3 forming a decorative surface is laminated on a backup layer 2 made of FRP via an intermediate layer 4 if necessary, and the gel coat layer 3 is a translucent gel coat layer. 3a and opaque colored gel coat layer 3
It has a two-layer structure with the translucent gel coat layer 3a as the outermost surface layer, and the colored gel coat layer 3b is partially mixed with the layer 3a, so that the mixed portion a appears in a pattern. .

In other words, in order to mold the above FRP bathtub,
As shown in FIGS. 2 to 5, first, a translucent gel coat layer serving as the outermost surface layer is formed on the mold surface 10a of the mold 10, for example, a liquid unsaturated polyester resin containing a filler (Al(OH) ₃ ). 11 as a first layer (see FIG. 2), and then, in the wet state of the first gel coat layer 11, an opaque colored gel coat layer, such as one of various colored pigments (titanium white, carbon black, aniline black, etc.) is applied. Alternatively, a liquid unsaturated polyester resin 12 containing two or more types is applied as a second layer (see Fig. 3), and when both layers are in an ungelled state, a portion of both layers is removed using, for example, a stirring bar B. After partially stirring and mixing in a stone-like pattern, the mixture gels (see Fig. 4), and then the FRP molding material 13, which becomes a back-up layer, is layered on top of it by a hand lay-up method or a spray-up method. By curing, a bathtub molded product as shown in FIG. 1 is obtained.

By the way, in the above example, when the gel coat layer after stirring is lined with the FRP molding material, either a single layer or a two-layer composite layer may be used. In particular, when laminating a composite layer, the inner layer is an intermediate layer. 1
If a thin surf essing mat, a thin surf essing cloth, a milled fiber, or a glass powder is used as the reinforcing fiber, and a chopped strand mat is used as the outermost reinforcing fiber, a finish with excellent appearance can be obtained.

Therefore, according to the above-described molding means according to the present invention, the gel coat layer is formed by coating two layers, a translucent gel coat layer and an opaque colored gel coat layer,
In addition, before laminating the FRP molding material, parts of both layers in an ungelled state are partially stirred and mixed into a stone-like pattern to form a pattern, so the pattern can be created regardless of the shape of the molded product. can be easily formed on-site, does not require conventional printing methods, and produces a three-dimensional pattern with depth and realism without any unnatural appearance due to pattern discontinuity (irregularity). It is something that can be done.

[Brief explanation of the drawing]

Figure 1 shows the result obtained by the molding method according to this invention.
FIGS. 2 to 5 are partially enlarged explanatory views showing an example of an FRP molded product, and FIGS. 2 to 5 are enlarged views showing a molding process for the FRP molded product. 1... FRP molded product, 2... Backup layer,
3... Gel coat layer, 10... Molding mold, 10a...
...Mold surface, 11...First gel coat layer, 12...Second gel coat layer, 13...FRP molding material, a
……pattern.

Claims (1)

[Claims] 1. Comprising a gel coat layer and a backup layer
When molding FRP, a first translucent gel coat layer was applied to the mold surface of the mold, a second colored gel coat layer was then applied, and the first and second gel coat layers were partially stirred. After that, there is a backup layer on top of that.
An FRP molding method characterized by laminating and hardening FRP molding materials.