JPH03224708A - Manufacture of reinforced plastic article having delustered pattern on surface, and the plastic article - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a manufacturing method suitable for forming a matte pattern on the surface of a reinforced plastic product at low cost and with good workability, and the reinforced plastic product. Regarding.

(Prior art) Conventionally, for example, when forming a matte pattern on the surface of a reinforced plastic product, there have been two methods: cutting a matte pattern on the mold itself, or manufacturing the matte pattern directly on the surface of the molded product. This is done by cutting the pattern and manufacturing it.

(Problem to be solved by the invention) However, in the former case, in which a matte pattern is cut on the surface of the mold, the size of the pattern, the position of the shape, etc. are fixed, and different designs are This method requires a mold, which increases the cost, and also has drawbacks such as the inability to freely select a design.

Furthermore, in the latter case, in which the surface of the molded product is directly matted by sandblasting or the like, there are drawbacks such as the processing time being long and the molded product itself becoming expensive.

The present invention was made in view of the above-mentioned shortcomings of the prior art, and its purpose is to provide a simple manufacturing method that allows free design selection without increasing the number of types of molds. The present invention provides a method for manufacturing a reinforced plastic product with a matte pattern at low cost, and the plastic product.

(Means for Solving the Problems) In order to achieve the above objects, the present invention provides (1)
A process in which a water-soluble matte paint is printed by screen printing on the surface of a mold coated with a release agent, and a matte paint layer is applied on the surface of the mold.

(2) A step of coating and forming a gel coat resin layer on the surface of the mold so as to cover the screen-printed matte paint layer.

(3) A step of forming a molded article in which a resin reinforcing layer containing a filler or glass fiber is laminated on the top surface of the gel coat resin layer.

(4) De-molding the molded product from the mold, and
The present invention is characterized by a method for producing a reinforced plastic product having a matte pattern on the surface, which comprises a step of washing the surface of the molded product with warm water or water to remove a matte paint layer on the surface of the molded product.

Further, the present invention is characterized by a reinforced plastic product having a matte pattern provided on the surface by the manufacturing method according to claim 1.

As the above-mentioned mold release agent, a wax type mold release agent, a silicone type mold release agent, etc. are used, but there is no need to be particularly limited thereto.

The matte paint used is a mixture of polyvinyl alcohol resin and filler, and the filler used is aluminum hydroxide.

Calcium carbonate, crystalline silica powder, fused silica powder, etc. are preferred, and the amount of filler added is preferably 0.5 to 30 parts by weight per 100 parts by weight of the resin.

Incidentally, a solvent or a thickener may be used to adjust the viscosity, but a suitable viscosity is about 300 voids.

Next, the gel coat resin is not particularly limited, but unsaturated polyester resins, acrylic resins, epoxy resins, nitrified cotton and trocellulose resins, or mixtures thereof with appropriate pigments and dyes are preferred.

Further, as the coating method, methods such as brush coating and spray coating are appropriately selected.

Next, there are no particular limitations on the resin used for the resin reinforcing layer, but it is preferable to use unsaturated polyester resin, acrylic resin, epoxy resin, etc. mixed with a curing agent as appropriate.

In addition, fillers used in the resin reinforcing layer include aluminum hydroxide, calcium carbonate, glass powder, plastic powder, crystalline silica powder, barium sulfate, magnesium silicate (talc), clay kaolin, magnesium oxide, diatomaceous earth, etc. is preferred.

The amount of filler added is 5 parts by weight per 100 parts by weight of resin.
The amount is preferably 0 to 500 parts by weight, and glass mat, glass cloth, glass paper, etc. may be used instead of the filler.

The resin reinforcement layer is created by applying and pouring a resin solution.

It can be carried out by a known method such as a Handley abutment method, a press molding method, a resin injection method, etc., and the method is not particularly limited.

(Operation) A water-soluble matte paint is applied to the surface of the mold by screen printing to create a matte pattern on the front and back sides.

Next, apply and form a gel coat resin layer on the mold,
Further, a resin reinforcing layer containing a filler or glass fiber is formed to form a molded product, and then the entire molded product is removed from the surface of the mold.

Then, by washing the surface of the molded product with warm water or water to remove the matte paint, a reinforced plastic product having a matte pattern on the surface is obtained.

(Example) Hereinafter, the invention according to claim 1 and the invention according to claim 2 will be explained in detail based on the drawings.

FIGS. 1(a) to 1(f) are explanatory cross-sectional views showing each step of the manufacturing method according to the invention of claim 1.

Step 1 As shown in Figure (a), mold release agent 2 (
■ After uniformly applying polyvinyl alcohol (manufactured by Showa Kobunshi Fin; trade name: [Release Agent-8D-Colorless J)] 1, as shown in Figure (b),
00 parts by weight, Aerosil (manufactured by Nippon Aerosil ■;
A matte paint 4 made by sufficiently kneading 8 parts by weight of AERO8I L200J (trade name: rAERO8I L200J) is poured onto a screen plate 3 (Made by Milano Grub; trade name: Tetron Screen #150J), and is applied onto the surface of the mold 1. While scratching with a squeegee 5, print the original pattern with the front and back reversed.

Note that the application of the mold release agent 2 to the mold 1 may be performed not every time but every few times, and printing using the screen plate 3 may be performed multiple times.

Step 2 As shown in Figure (C), a gel coat resin (manufactured by Hitachi Chemical Co., Ltd.), which is an isophthalic acid-based unsaturated polyester resin, is placed on the surface of the mold 1 so as to cover the printed matte paint layer 6. A mixture of 100 parts by weight of 682PJ (trade name) and 1 part by weight of methyl ethyl ketone peroxide is spray coated to form the gel coat resin layer 7.

Step 3 A resin reinforcing layer 8 is laminated on the upper surface of the gel coat resin layer 7 by a hand lay-up method, as shown in Figure (d).

The composition of the resin reinforcing layer 8 is orthophthalic acid-based unsaturated polyester resin (manufactured by Hitachi Chemical Co., Ltd.; trade name: Polyset 5).
182APTJ) and 1 part by weight of methyl ethyl ketone peroxide were mixed, and 450 g/m2 of glass mat (manufactured by Fuji Fiberglass; trade name: IF E) was mixed.
M-450J) was laminated using a known hand lay-up method.

In addition, the resin reinforcing layer 8 is made of orthophthalic acid-based unsaturated polyester resin (manufactured by Hitachi Chemical Co., Ltd.; product name: "Polyset 5").
A mixture of 100 parts by weight of 182APTJ), 1 part by weight of methyl ethyl ketone peroxide, and 200 parts by weight of calcium carbonate (manufactured by Nitto Funka Kogyo, trade name: NS-100J) may be poured into a layer.

Step 4 As shown in Figure (e), from the mold 1, the matte paint layer 6° gel coat resin layer 7. The molded product a with the resin reinforcing layer 8 integrated therein is demolded.

Next, the surface of this molded product a was washed with warm water, and the surface of the molded product a was
As shown in f), the soluble matte paint layer 6 is dissolved and removed to obtain a reinforced plastic product, which is a molded product a', with a matte pattern appearing on the surface.

(Effect of the invention) As explained above, according to the invention described in claim 1,
Compared to conventional methods such as cutting a matte pattern into the mold itself or cutting a matte pattern directly onto the surface of the molded product, this method is more flexible without increasing the variety of molds. This makes it possible to select various designs and shorten processing time, making it possible to mold reinforced plastic products with matte patterns on the surface using a simple manufacturing method and at low cost.

Further, according to the invention set forth in claim 2, since the reinforced plastic products are manufactured by the invention set forth in claim 1, reinforced plastic products having various matte patterns can be manufactured easily and at low cost.

[Brief explanation of drawings]

Figures (a) to (f) are explanatory cross-sectional views showing each step of the manufacturing method according to the invention of claim 1. 1... Molding mold 2... Mold release agent 3... Screen plate 4... Matte paint 5... Squeegee 6... Matte paint layer 7... Gel coat resin layer 8...・Resin reinforcement layer a...molded product (a) (b) (c) (d) (e) (f)

Claims (1)

[Claims] 1. A method for manufacturing a reinforced plastic product having a matte pattern on its surface, which comprises the following steps. (1) A process of printing a water-soluble matte paint by screen printing on the surface of the mold coated with a mold release agent to form a matte paint layer on the surface of the mold. (2) A step of coating and forming a gel coat resin layer on the surface of the mold so as to cover the screen-printed matte paint layer. (3) A step of forming a molded article in which a resin reinforcing layer containing a filler or glass fiber is laminated on the top surface of the gel coat resin layer. (4) De-molding the molded product from the mold, and
A process in which the surface of a molded object is washed with warm water or water to remove the matte paint layer on the surface of the molded object. 2. A reinforced plastic product, characterized in that a matte pattern is provided on its surface by the manufacturing method according to claim 1.