JP2001011197A - Resin molding product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a resin molding product having excellent colorless transparency and weather resistance, suitable for job shop type production due to curing at a low temperature. SOLUTION: In this resin molding product obtained by adding a filler to a base material consisting essentially of an epoxy resin and a curing agent to give a material and subjecting the material to cast molding, the epoxy resin is a resin mixture containing >=1 wt.% of a hydrogenated bisphenol A glycidyl ether.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin molded product used as a substitute material for pottery, for example, for sanitary ware such as a basin, a toilet, a tank, etc., a counter, a bathtub, and the like.

[0002]

2. Description of the Related Art Sanitary ware such as washbasins and toilets includes pottery stone,
Although baked goods using feldspar and clay as main raw materials are used,
Artificial marble with excellent design is used for counters and bathtubs.

[0003] As disclosed in Japanese Patent Application Laid-Open No. 2-6359, an artificial marble using an epoxy resin by casting is a method in which an epoxy resin, an acid anhydride curing agent, a curing accelerator, and a filler are poured into a mold. And cured. The feature of the molded product is that it is colorless and excellent in transparency, so that it has a deep and aesthetically superior surface quality.

[0004]

However, since the above-mentioned molded article is a high-temperature curing system, it is necessary to use a molding die, and in some cases, a curing furnace at 100 ° C. or higher may be required. Yes, equipment costs are high. Therefore,
The above-mentioned acid anhydride curing system is intended for low-mix high-volume production and not for high-mix low-volume production. In order to cope with this multi-product small-quantity production, a low-temperature curing system that can be molded with a resin mold having a low mold cost is required. In general, in the case of low-temperature curing systems, amine curing systems are used for adhesives and paints. For example, resin molding formed of bisphenol A glycidyl ether, which has the best cost performance as an epoxy resin, and an amine curing agent The products have the disadvantage that they do not have sufficient weather resistance and are prone to discoloration when exposed to sunlight for a long period of time. For this reason, a molded article molded with an epoxy resin and an amine-based curing agent has not been used for artificial marble that values the surface quality.

The present inventors have found that the addition of a trace amount of hydrogenated bisphenol A glycidyl ether significantly improves the weather resistance of an epoxy resin. Accordingly, an object of the present invention is to provide a resin molded product which is cured at a low temperature and is suitable for small-quantity production of many kinds, and the molded product is excellent in colorless transparency and also excellent in weather resistance.

[0006]

Means for Solving the Problems To achieve the above object, an invention according to claim 1 is obtained by casting a material obtained by adding a filler to a base material mainly composed of an epoxy resin and a curing agent. In the obtained resin molded product, the epoxy resin is a resin mixture containing 1% by weight or more of hydrogenated bisphenol A glycidyl ether.

A molded article in which the ratio of hydrogenated bisphenol A glycidyl ether to the entire resin mixture is 1% by weight or more is comparable in weather resistance to, for example, a conventionally known molded article of bisphenol A glycidyl ether and an acid anhydride. It has the effect of doing.

The filler is at least one of silica, aluminum hydroxide and glass frit, and the ratio of the base material mainly composed of the epoxy resin and the curing agent to the whole material is 20% by weight to 60% by weight. Is the following,
In order to increase the strength and the thermal shock resistance, the average particle size is set to 20.
It is desirable that the thickness be not more than μm.

The invention according to claim 2 is characterized in that the epoxy resin is a resin mixture composed of bisphenol A glycidyl ether and hydrogenated bisphenol A glycidyl ether.

The invention according to claim 3 is characterized in that the curing agent is an amine curing agent which cures at room temperature, preferably trimethylhexamethylenediamine or norbornanediamine.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below. Among the epoxy resins, bisphenol A glycidyl ether, alicyclic type, etc. are conceivable in order to obtain a molded article having excellent colorlessness and transparency, but among these, it is liquid at room temperature to be cast at room temperature. Is an essential condition. Further, in consideration of compatibility with an amine-based curing agent which cures at room temperature, a mixture composed of bisphenol A glycidyl ether and hydrogenated bisphenol A glycidyl ether is optimal.

Amine is widely known as a curing agent which cures at room temperature. Among them, colored aromatics are excluded from the object of the present invention. Of the remaining aliphatic and alicyclic groups, trimethylhexamethylenediamine or norbornanediamine is most preferable in consideration of toxicity, hygroscopicity and carbonic acid absorbing property. It should be noted that isophoronediamine and the like having the same properties are also available. However, it was confirmed that the weather resistance was inferior. Of course, if the weather resistance is improved by adding another substance or performing a pretreatment, it is also possible to employ isophoronediamine or the like.

(Weather resistance test of molded article of the present invention) First, trimethylhexamethylenediamine or norbornanediamine was selected as an amine-based curing agent for an epoxy resin comprising a mixture of bisphenol A glycidyl ether and hydrogenated bisphenol A glycidyl ether. Then, aluminum hydroxide was selected as a filler, and the ratio of hydrogenated bisphenol A glycidyl ether to the entire resin mixture was changed variously to form molded articles.

FIG. 1 shows the weather resistance test results of these molded products.
Shown in The solid black line indicates norbornanediamine (NBD
A), the black square dotted line is trimethylhexamethylenediamine (TMD). In addition, the test result is based on JIS
A sunshine weathering test based on A1415 (WS type) was performed to measure a color difference (ΔE) after exposure for 100 hours. Since ΔE of the molded product of bisphenol A glycidyl ether and acid anhydride is 6.0, if the ratio of hydrogenated bisphenol A glycidyl ether to the entire resin mixture is 1% by weight or more, bisphenol A glycidyl ether and acid anhydride are used. Is equal to or more than the weather resistance of

In molding the molded article according to the present invention, the curing temperature can be set to a relatively low temperature, for example, 80 ° C. or less, and the molding die can be made of an inexpensive resin mold. Suitable artificial marble can be provided at low cost. After curing, after-curing may be performed to improve heat resistance such as heat distortion temperature.

[0016]

According to the present invention, it can be cured at a low temperature and is suitable for small-lot production of many kinds, and it is possible to provide a resin molded article having excellent colorless transparency and excellent weather resistance.

[Brief description of the drawings]

FIG. 1 is a view showing a test result of weather resistance of a molded article according to the present invention.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) C08L 63:02 (72) Inventor Akira Ebata 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu-shi, Fukuoka TOTO Inside Equipment Co., Ltd. (72) Inventor Hiroaki Shimomura 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu-shi, Fukuoka F-term (reference) inside Totoki Equipment Co., Ltd. AA05 AC08 AD08 DC06 JA15

Claims (3)

[Claims] 1. A resin molded product obtained by casting and molding a material obtained by adding a filler to a base material mainly composed of an epoxy resin and a curing agent, wherein the epoxy resin comprises one hydrogenated bisphenol A glycidyl ether. A resin molded product characterized in that it is a resin mixture containing not less than% by weight. 2. The resin molded article according to claim 1, wherein the epoxy resin is a resin mixture comprising bisphenol A glycidyl ether and hydrogenated bisphenol A glycidyl ether. 3. The resin molded article according to claim 1, wherein the curing agent is an amine curing agent that cures at room temperature, preferably, trimethylhexamethylenediamine or norbornanediamine.