JP2943446B2 - Patterned molded body made of fiber reinforced plastic - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a patterned molded body made of fiber-reinforced plastic which can be used as a material for bathtubs, waterproof pans with washing areas, counters, kitchen counters and the like.

[0002]

2. Description of the Related Art Conventionally, fiber reinforced plastics using unsaturated polyester resin and glass fiber have been used in bathtubs, washing places,
It has been used as a material for ships, tanks, etc., for which waterproofness, light weight and high strength are required. Further, the fiber reinforced plastic is generally used in a laminated structure with a single color gel coat layer. This gel coat layer is a coating film used to improve hot water resistance and chemical resistance, and is applied by a spray-up method.The gel coat resin is obtained by coloring an unsaturated polyester resin with a single-color pigment, and coating. It has been used by adding fine silicon oxide powder to make it thixotropic as appropriate.

[0003]

However, the single-color gel coat layer is flat and not excellent in terms of aesthetic appearance. Further, since it is a single-color gel coat layer, it was impossible at all to provide various patterns such as a shadow pattern. Therefore, for the purpose of further improving the aesthetic appearance, an FRP molded product obtained by adding fine mica powder treated with titanium oxide to a gel coat resin (Japanese Patent Laid-Open No. 55-8114).
9) and the addition of various fillers to the gel coat resin are devised. In these cases, foreign substances are basically mixed in the clear gel coat resin, and further, a colored gel coat having a hiding power is applied. Was something. However, when foreign substances are mixed in the gel coat resin, the hot water resistance is deteriorated due to the adhesiveness of the interface between the resin and the filler, and therefore, when a pattern is applied to a molded article made of fiber reinforced plastic, Methods such as coating two or more layers of gel coat resin have been employed.

According to the present invention, the gel coat resin layer can be formed without impairing the basic properties such as hot water resistance of the gel coat resin.
It is an object of the present invention to realize a molded body made of a fiber-reinforced plastic having a deep pattern such as a shadow pattern in a layer.

[0005]

In a laminated structure in which a gel coat layer and a back reinforcing layer made of fiber reinforced plastic are laminated as basic components from the surface, the surface gel coat layer is composed of two or more types of gel coat resins. In the gel coat layer, the optical density is 1.0 or less in a region of 1% or more and 50% or less per unit area, and the total optical density per unit area is 2.0 or more.

[0006]

When the surface gel coat layer uses two or more types of gel coat resins, a multicolor pattern such as a shadow pattern is realized. Since the surface layer is not provided with a pattern by a filler or a foreign substance, performances such as hot water resistance and chemical resistance are not impaired. Therefore, there is no need to apply any number of gel coat layers, and the gel coat layer can be composed of one layer. Further, since the optical density is 1.0 or less in a region of 1% or more and 50% or less per unit area in the surface gel coat layer, a deep natural pattern design is realized. On the other hand, since the total optical density per unit area is 2.0 or more, the back fiber reinforced plastic layer cannot be seen through the gel coat resin layer on the surface.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A patterned molded article made of a fiber-reinforced plastic according to the present invention has a structure in which a gel coat layer and a backside reinforcing layer made of a fiber-reinforced plastic are sequentially laminated. The gel coat layer on the surface is composed of two or more kinds of gel coat resins of different colors, and has an optical density of 1.0 or less in a region of 1% or more and 50% or less per unit area in the surface gel coat layer. The optical density indicates the ratio of transmitted light to incident light per unit length, and is defined by the following equation.

Optical density C = 1 / t (log (I ₀ / I)) t: thickness, I ₀ : incident light, I: transmitted light In a region of 1% or more and 50% or less per unit area in the surface gel coat layer. An optical density of 1.0 or less means that a transparent or translucent portion through which light passes, that is, a portion having a transmittance of 10% or more is in a region of 1% or more and 50% or less. With such a configuration, it is possible to realize a design with a deep natural shadow pattern. That is, the natural shadow is composed of mica and the mica is composed of a translucent material.

Furthermore, the total optical density per unit area is 2.0 or more. The total optical density per unit area means an average value of optical densities per unit area, which may include a portion having a small optical density. With this configuration, the back fiber-reinforced plastic layer is never seen through the gel coat resin layer on the surface.

Hereinafter, specific examples including a method for producing a patterned molded article made of the fiber reinforced plastic of the present invention will be described.

(Example 1) A clear gel coat resin (optical density: 0.1) (2) composed of an iso-unsaturated polyester resin was added to a mold (1) by using a cup gun at an atomizing pressure of 0.3 kg / cm.
^It was applied at a rate of 300 g / m ² under the conditions of ² (FIG. 1a). Since the atomization pressure was reduced, the gel coat resin was sprayed on the mold in a certain amount without atomization as shown in the figure. Subsequently, a gel coat resin composed of an iso-unsaturated polyester resin colored black (optical density: 3.0)
(3) was applied at a rate of 300 g / m ^{2 at} an atomizing pressure of 1.2 kg / cm ² (FIG. 1b). The gel coat resin in this case was uniformly atomized. The gel coat resin applied in this manner was cured at 50 ° C. for 30 minutes. The thickness of the gel coat after curing was 0.4 mm. Furthermore, a 2.5 mm fiber-reinforced plastic layer (4) was laminated on the back and cured (FIG. 1c). By removing this from the mold, a patterned molded body made of the desired fiber-reinforced plastic (FIG. 1d) was obtained.

The surface gel coat layer of the molded article thus obtained is composed of two kinds of gel coat resins and has an optical density of 1.0 or less in a region of about 25% per unit area in the surface gel coat layer. . The total optical density was 2.5. This molded article was able to realize a black shadow pattern using two types of gel coat resins. Especially,
By making the optical density 1.0 or less in a region of about 25% per unit area in the gel coat layer, a deep shadow pattern could be obtained. The gel coat resin layer was composed of one layer, and performance aspects such as hot water resistance and chemical resistance did not decrease. Since the total optical density was 2.5, the back fiber reinforced plastic layer did not show through through the gel coat resin layer on the surface at all.

(Example 2) A multicolor gun device (manufactured by Mikuni Pigment Co., Ltd.) was used for the mold 1A, and the pressure was 30 kg / cm ^{2 at} an atomizing pressure of 0.3 kg / cm ^2.
It was applied at a rate of 0 g / m ² (FIG. 2a). Further application was carried out at a rate of 300 g / m ² under the condition of an atomizing pressure of 0.3 kg / cm ² (FIG. 2b). The three types of gel coat resin and tank pressure in the three gel coat tanks of the multicolor gun device are shown below.

Tank pressure (kg / cm ² ) Clear gel coat resin (optical density 0.1) 1.25 White gel coat resin (optical density 4.0) 2.35 Black gel coat resin (optical density 4.0) 1.90 The multi-color gun device uses three gel coat tanks with three pressures.
This is an apparatus in which two gel coat resins are discharged from a gun after passing through a certain mixing pipe, mixed with a curing agent, and then atomized at an arbitrary atomizing pressure. The gel coat resin applied in this manner was cured at 50 ° C. for 30 minutes. The thickness of the gel coat after curing was 0.4 mm. Further, a fiber-reinforced plastic layer of 2.5 mm was laminated on the back, and cured (FIG. 2c). By removing the mold, a patterned molded body made of the desired fiber-reinforced plastic was obtained.

The surface gel coat layer of the molded article thus obtained is composed of a gel coat resin of three congratulations and has an optical density of 1.0 or less in a region of about 18% per unit area in the surface gel coat layer. . The total optical density was 3.2. This molded article was able to realize a white shadow pattern using three types of gel coat resins. Especially,
By making the optical density 1.0 or less in a region of about 18% per unit area in the gel coat layer, a deep white shadow pattern could be obtained. The gel coat resin layer was composed of one layer, and performance aspects such as hot water resistance and chemical resistance did not decrease. Since the total optical density was 2.5, the back fiber reinforced plastic layer did not show through through the gel coat resin layer on the surface at all.

A commercially available pearl glaze (MC-355, manufactured by Nippon Koken Kogyo Co., Ltd., average diameter of 30 to 100 microns) was used as fine mica powder in the clear gel coat resin.
When added in a proportion of not more than% by weight, a white-gray-like molded article having a more glossy feeling could be obtained. It should be noted that even if a filler is added to one type of gel coat resin as in the present embodiment, performances such as hot water resistance and chemical resistance do not decrease.

[0017]

As described above, the following effects can be obtained according to the patterned molded article made of the fiber-reinforced plastic of the present invention. The surface gel coat layer is made of two or more kinds of gel coat resins and has an optical density of 1.0 or less in a region of 1% or more and 50% or less per unit area in the layer, so that one gel coat layer has hot water resistance and chemical resistance. It is possible to realize a design of a deep natural shadow pattern and a multicolored pattern such as a shadow pattern without impairing the performance of such a shadow pattern. Furthermore, since the total optical density per unit area is 2.0 or more, a patterned molded body made of fiber reinforced plastic is obtained in which the back fiber reinforced plastic layer is not seen through the gel coat resin layer on the surface. Can be.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a patterned molded body made of the fiber-reinforced plastic of the present invention.

FIG. 2 is a partial cross-sectional view when a multicolor gun device is used in the molded body.

[Explanation of symbols]

 1 type 2 clear gel coat resin 3 black gel coat resin 4 fiber reinforced plastic layer 5 multicolor gel coat resin

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B32B 1/00-35/00 B29C 67/12-67/18 B29C 39/00-39/44

Claims (1)

(57) [Claims] 1. A laminated structure in which a gel coat layer and a back surface reinforcing layer made of fiber reinforced plastic are laminated as basic components from the surface, wherein the surface gel coat layer is composed of two or more types of gel coat resins, A patterned molded article comprising a fiber-reinforced plastic having an optical density of 1.0 or less in a region of 1% or more and 50% or less per unit area and a total optical density of 2.0 or more per unit area.