JPS6264858A - Unsaturated polyester resin molding compound - Google Patents

Abstract

PURPOSE:To provide the titled compound which gives beautiful moldings on a mass production scale, which are free from color non-uniformity and have very high transparency and good surface smoothness, containing a three-dimen sional styrene polymer and glass powder. CONSTITUTION:The titled compound is obtd. by incorporating 1-20pts.wt. three-dimensional styrene polymer (A) (e.g., a polymer having a crosslink density of 2-30% obtd. by adding divinylbenzene to styrene monomer and carrying out a crosslinking reaction) and 10-200pts.wt. glass powder (B) (pref. powder having an average particle size of 80-200 mesh) in 100pts.wt. unsaturated polyes ter resin (C). When the compound is compressed by heating, the resin component is prevented from shrinking during curing so that beautiful moldings can be obtd. which are free from color non-uniformity and have good surface smooth ness and transparency.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an unsaturated polyester resin molding compound for obtaining molded articles having excellent transparency and uniform hue. The molded products are used for bathtubs, kitchen counters, bathroom vanities, etc.

Conventional technology When hot compression molding bathtubs, kitchen counters, bathroom vanities, etc., the unsaturated polyester resin molding compound is usually sheet molding compound (hereinafter abbreviated as BMC) or bulk molding compound (hereinafter referred to as BMC). (abbreviated as BMC), which have conventionally been obtained as monochromatic or patterned molded products. However, it is difficult to give a luxurious appearance due to the lack of transparency, especially when it comes to monochromatic colors.
When trying to obtain a beautiful molded product with good transparency and a smooth surface, the problem is that color unevenness inevitably occurs.

Problems that the invention aims to solve In recent years, there has been a demand for higher quality and more diverse appearance quality for various products, but this is not the case with BMC-
? Compression molded products such as BMC are no exception. In response to this market demand, the present invention uses a combination of three-dimensional styrene polymer and glass powder to mass produce beautiful molded products that do not cause color unevenness, are very transparent, and have good surface smoothness. Rather than making it possible, it seeks to respond to it.

The present invention solves the drawbacks of the prior art as described above,
As a result of extensive research, we found that molded products without the above-mentioned defects can be easily obtained by using an unsaturated polyester resin molding compound that uses a three-dimensional styrene polymer as a low shrinkage agent and glass powder as a filler. ,
Moreover, it was discovered that mass production is possible, and based on these findings, the present invention was completed.

That is, the present invention provides an unsaturated polyester μ resin mold containing a three-dimensional styrene polymer and glass powder.
It is a ding compound.

The three-dimensional styrene polymer used in the present invention includes:
The crosslinking density obtained by copolymerizing a styrene monomer and a crosslinking agent is about 0.2 to 30%, preferably about 0.6 to 10%.
%, and has a three-dimensional network structure in which styrene polymers are crosslinked with a crosslinking agent. This three-dimensional styrene polymer is usually used in the form of a powder, and its particle size is about 100 microns or less, preferably about 20 to 50 microns.

In addition, when copolymerizing the styrene monomer and the crosslinking agent, the polymerization reaction may be carried out using a mixture of the styrene monomer and another vinyl monomer that can be copolymerized with the styrene monomer. As a crosslinking agent for three-dimensional styrene polymer,
- Compounds with two polymerizable ethylenically unsaturated double bonds in the molecule, such as divinylbenzene derivatives (e.g. divinylbenzene, divinylbenzene),
A μ kylene glycol diacrylate or μ kylene glycol dimethacrylate derivatives (eg, ethylene glyco-p dimethacrylate, ethylene glycol diacrylate), diallyl phthalate, etc. can also be used. Other vinyl monomers that can be copolymerized with the styrene monomer include vinyl acetate/L', acrylic acid, methacrylic/L'S, methacrylic acid ester, acrylic/L'
Examples include acid ester/L/ (e.g., acryl fi/methyl acid, methacrylate/L/methyl acid), acrylonitrium, acrylamide, etc.The amount of vinyl monomer that can be copolymerized with this styrene monomer is determined based on the purpose Although it varies depending on the physical properties of the molded product, it is generally preferable for practical use to use up to about 80% by weight of carbon based on the styrene monomer.When the crosslinking density of the three-dimensional styrene polymer is less than 0.2%, the solubility in the styrene monomer is If the size is too large, or conversely exceeds 80%, it becomes difficult to swell with the styrene monomer, and in either case, the desired low shrinkage effect may become insufficient.

Note that the above-mentioned crosslinking density can also be defined as a copolymerization ratio of a styrene monomer and a crosslinking agent, or a mixture of a styrene monomer and another vinyl monomer that can be copolymerized with the crosslinking agent, as shown below. That is, the above copolymerization ratio U100 of the three-dimensional styrene polymer: 0.2 to 10
0:aO, preferably 100:0.5 to 100:10.

The addition of the three-dimensional styrene polymer is about 1 to 20 parts by weight, preferably about 1 to 20 parts by weight, per 100 parts by weight of the resin in the unsaturated polyester lVtM8'd modding compound.

The glass powder used in the present invention has an average particle size of about 20 to 800 mesh, preferably about 80 to 200 mesh.
I can give you something from Metshiyu.

The amount is approximately 10 to 30 parts by weight based on 100 parts by weight of the resin in the unsaturated polyester μ resin Moldy Fugu Conbound.
0 parts by weight, preferably about 50 to 200 parts by weight.

In the present invention, an inorganic filler such as aluminum hydroxide, subacidic acid, clay, etc. may be added to the above-mentioned material within a range that does not impair transparency. Further, internal mold release agents such as zinc nutearate and calcium stearate, curing catalysts such as high-temperature decomposition type peroxides such as bency peroxide/I/perbutylene reoctoate, glass, inorganic fibers such as asbestos, vinylon, Fiber reinforcing materials such as organic fibers such as nylon, or optional colorants, stabilizers, thickeners, etc. may be added.

An example of an unsaturated resin molding compound is Polymer Matte.

Polymer μ■・Premigutus■j Premiglass■BMC
, Polymer y Mat HM, Polymer μ Mat TM,
Examples include Polymer Mat B, TMC (manufactured by Takeda Pharmaceutical Co., Ltd.).

The unsaturated Boriente μ resin moding compound containing the three-dimensional styrene polymer and gaff powder as described above is heat compressed.

This operation is performed using a press machine, and the temperature is approximately 110-160℃ and the pressure is approximately 50-10G#/
It is about 12. By this operation, a transparent molded product with a smooth surface and no color unevenness can be obtained.

"Effects of the Invention" When the unsaturated Borien ether resin moding compound of the present invention is heated and compressed, when the resin component hardens, shrinkage is suppressed, surface smoothness is good, transparency is achieved, and the color is beautiful with no unevenness. Molded products can be obtained.

Next, the present invention will be explained in more detail with reference to Examples and Comparative Examples.

Example A BMC having the composition shown in Table 1 and a BMC having the composition shown in Table 2 were prepared, and the mold temperature was 140°C.
Molding pressure 60 kg/CH2, molding time 5 minutes, material charge rate 85% of the projected area of the molded product 17) Length 80011 Jl, width 500 MM depending on molding conditions.

A flat plate with a thickness of 5 mm was obtained. As a result, transparent molded products with good surface smoothness and no color unevenness were obtained in all Examples.

Table 1 (1) Bispheno-/I/system (2) Iso-neoplier μ thread (3) Nutylene heptamer 99m, divinylbenzene 0.
Product consisting of a mixture of 55 parts, average particle size aOμ (4) Gaffs Powder M-108 (manufactured by Nippon Fell) (
5) Heijirai) H-820 (Showa Light Metal) (Evaluation) 0 Excellent visual inspection 0 Good Molding was carried out under the same conditions. As a result, a molded article with good surface smoothness, color, and transparency could not be obtained as in the examples.

Table 8

Claims (1)

[Claims] An unsaturated polyester resin molding compound containing three-dimensional styrene polymer and glass powder.