JPS5931134A - Molding method of synthetic resin - Google Patents

Abstract

PURPOSE:To obtain desired additional decorative layers by a method wherein a mixture of unhardened liquid unsaturated polyester resin and aluminum hydroxide or glass frit is hardened, the hardened substance is crushed to pieces and the crushed pieces of resin particles are hardened. CONSTITUTION:100pts.wt. of unhardened liquid unsaturated polyester resin is added with 10-300pts.wt. of aluminum hydroxide or glass frit, and further added with a desired coloring agent and a hardener of methyl ethyl ketone peroxide. After the mixture is sufficiently agaitated, it is formed into a board shape for hardening. Thus obtained hardened resin substance is crushed to pieces having a required diameter by a hammer mill or the like for classification. Then, 50- 300pts.wt. of the resin particles are added to 100pts.wt. of liquid unsaturated polyester, poured into a square mold and hardened. The surface of the hardened product is polished for manufacturing an imitation stone such as a Marborone.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for decorating the surface layer of fiber-reinforced resin molded products having an appearance resembling pseudo-stone, terrazzo, or natural stone. By creating particles made of polyester resin and solidifying these resin particles by mixing them with other uncured liquid resins, it is possible to form decorative layers with a high degree of diversity in terms of transparency, color tone, etc. It is something to do.

Traditionally, terrazzo is a pseudo-stone made by mixing and dispersing crushed pieces of natural stone such as marble in an unsaturated polyester resin, and terrazzo is known as a pseudo-stone made by mixing and dispersing crushed pieces of natural stone such as marble into an unsaturated polyester resin. Similarly, resin molded products with the stone IR feel of dispersed natural stones are known. The method for forming a decorative layer on the surface of such pseudostones, terrazzos, and 1.01 resin molded products uses crushed pieces of natural stone as decorative particles. The degree of freedom in adjusting the transparency, color tone, and physical properties of the material was limited, making it impossible to decorate according to various tastes. Unfortunately, marble and other materials have poor chemical resistance, so when vinegar or the like comes into contact with the surface of the decorative layer of a molded product, the surface will turn white. Furthermore, since the adhesion between the crushed pieces and the resin layer (gel coat layer) is insufficient, the crushed pieces fly out from the resin layer while polishing the surface, causing edges and creating an unsightly appearance. Disadvantages such as not being able to obtain strong products 7)! there were.

This invention has been made in view of the above circumstances, and an object of the invention is to provide a decorative molding method that can obtain various decorative layers according to various tastes.

The present invention will be described in detail below.

The molding method of this invention involves adding a coloring agent to an uncured liquid unsaturated polyester resin and adding aluminum hydroxide (sometimes referred to as alumina hydrate) or glass fiber, and then curing the resin. The cured product is crushed to produce resin particles, and the resin particles are mixed with another liquid resin and solidified to form a decorative layer.

First, resin particles to be used as decorative particles will be explained.

1 part by weight of aluminum hydroxide or glass frit per 100 parts by weight of uncured liquid unsaturated polynisder resin.
Add 0 to 300 parts of heavy stones. The reason why aluminum hydroxide or glass frit is added here is to adjust the transparency of the resulting resin particles.

More aluminum hydroxide or glass frit, %
If you add about 1 part by weight, it will turn white and become opaque, but if you add at least 10 to 30 parts by weight, it will become transparent6.
If the amount exceeds 1 part by weight, the above-mentioned effects will no longer increase with addition, and problems such as poor dispersion or insufficient wetting of the filler will occur. Next, a coloring agent is added to give the desired color. Toner colors for unsaturated polyester resins are used for this purpose. The amount of coloring agent added is Cow!
It is not limited to t, but is determined by the degree of coloring of the resin particles. Of course, if necessary, it can be made colorless without adding a colorant.7. .

Then, a curing agent such as methyl esarchutone peroxide or penzoyl peroxide, and a curing accelerator such as cobalt naphthenate are appropriately added to this liquid mixture and mixed well. 2. This liquid resin mixture preferably has a thickness of 5 to 2 (hardened after being molded into a plate shape of about 1 gate)1. Ru.

The obtained cured resin product is then crushed to a required particle size using a crusher such as a hammer mill, and classified using a classifier to obtain 1 p of 'Il'j QiT 'kJ particles having the required particle size range.

Among the decorative particles obtained in this way, resin particles with different shapes such as color and transparency can be appropriately combined and prepared separately. It is mixed with the liquid resin, solidified, and poured into a rectangular mold, and after hardening, the surface of the cured product is polished to produce pseudo-stones such as Marbolon. can. 30 to 200 parts by weight of resin particles per 100 parts by weight of uncured gel coat liquid9
: After applying it to the mold surface and gelling it, a fiber-reinforced resin molded product is formed by the usual hand lay-up method or spray-up method, and the gel coat layer becomes a decorative layer. A resin molded product can also be obtained. Furthermore, liquid methyl meth-ac-11-acid prevo IJmer (
Adding resin particles to acrylic syrup (sometimes called acrylic syrup) and applying this mixture to the surface of the target object to create a decorative layer, or pouring the mixture into a mold and hardening it to form a molded product. You can also do it.

According to this decorative molding method, one resin particle is used as a decorative particle, which is obtained by adding aluminum hydroxide or glass fiber to an unsaturated polyester resin, curing it, and pulverizing the resulting resin particles. The transparency of the particles can be adjusted freely, allowing you to obtain whatever you like. 1Also, since the resin particles are almost colorless and transparent, when colored, the color tone can be freely selected and extremely vivid. You can freely change the specific gravity, strength, and resistance to 5 grains of grass. Therefore, the decorative layer obtained using this resin particle is bright! W1 It is extremely diverse in terms of color tone, transparency, etc., and is rich in variety to meet the preferences of seeds.
1 side 1 drug 1 te 130,000 will be good.

Examples are shown below.

[Act 1! rUif! 1] Two kinds of lily and l fat particles were prepared according to the two formulation examples shown below and (1).

■ 0 unsaturated resin 1] ester resin 1 (10 Inn
Methyl ethyl ketone peroxide 1.5 1.5 Cobalt naphthenate 0.13 0.13
Aluminum hydroxide 250-green toner 0.5-brown toner
50 (unit: heavy weight) Each of the two mixtures was inserted into cellophane to form a plate with a thickness of 3%, heated in an oven at 60°C for 1 hour to harden, and then the cellophane was peeled off, and then hammer milled. Grind with
The particles were classified into 10 to 50 mesh particles.

These resin particles of ■ and ■ were mixed in a ratio of 1:1 to 200% by weight of the unsaturated polyester resin.
Parts by weight were added and mixed, poured onto a 30 crn square concrete block so as to have a thickness of 2, hardened, and the surface polished to produce a pseudo stone. The obtained pseudostone had an extremely beautiful surface.

As explained and clarified above, the decoration method of the present invention involves curing a mixture of liquid unsaturated Boryennether resin with aluminum hydroxide or glass frit. This cured product is crushed to create resin particles, and the resin particles are mixed with liquid resin and solidified to form a decorative layer, so the color tone, transparency,
The physical properties can be freely adjusted, so the decorative layer made using these resin particles has two brightness tones, transparency,
It is very versatile in terms of brightness, etc., and can meet various tastes.It is also said to have good processability, durability, chemical resistance, and looseness. Benefits can be obtained.

Applicant: Nippon Musical Instruments Manufacturing Co., Ltd. 12'1;;l+・'1゜Daiyato Patent Attorney Tadashi Shiga Si, E':□:゛゛□
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Claims (1)

[Claims] A mixture of uncured liquid unsaturated polyester resin and aluminum hydroxide or glass frit is cured, and the cured product is crushed to produce resin particles.