JPS60147471A - Polyphenylene sulfide resin composition of high weatherability - Google Patents

Abstract

PURPOSE:To obtain a composition of markedly improved weatherability, thus suitable for outdoor use, by incorporating copper oxide and/or copper sulfide in polyphenylene suflide resin. CONSTITUTION:The objective composition can be obtained by incorporating (A) 100pts.wt. of polyphenylene sulfide resin with (B) 0.1-100pts.wt. of copper oxide and/or copper sulfide (cupric oxide and/or cuprous sulfide with an average particle diameter 1-300mu).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a poly-7-enylene 7-eyed resin (hereinafter abbreviated as 'I' PS resin) composition which has greatly improved weather resistance.

PP8 resin has excellent heat resistance, chemical resistance, and mechanical strength, and is widely used as a so-called engineering plastic in electrical and electronic parts, automobile parts, mechanical parts, structural parts, etc.

However, it is known that one of the drawbacks of this pps resin is poor weather resistance. When PPS resin is exposed to direct sunlight outdoors, there is little decrease in strength, but compared to
In a short period of time, the surface becomes rough and the glass fibers come to the surface, causing decoloration and other problems.

Until now, there was no known method to improve the weather resistance of pps resin, and the company had been forced to give up on using it in applications exposed to direct sunlight, such as exterior parts. Therefore, there has been a strong desire to improve the weather resistance of P P 8 resin.

The inventors of the present invention focused on this point and as a result of intensive study, they discovered the surprising fact that weather resistance can be significantly improved by adding a specific amount of copper oxides and sulfides. The present invention has been achieved.

The present invention will be explained in detail below.

The PPS resin used in the present invention has the general formula (1)
Uncrosslinked products, such as Phillips Bethesham R7ton V-1, or those partially crosslinked by heat treatment, such as Ryton P-4.

p-L6. RL-6 etc. are used. These raw materials □
PPS resins can also be used in combination depending on the purpose.

Next, examples of the copper oxide powder used in the present invention include cuprous oxide and cupric oxide, and cupric oxide is particularly desirable from the viewpoint of stability. Further, examples of the copper sulfide powder include cuprous sulfide and cupric sulfide.

The average particle diameter of these powders is preferably 1 to 30.0 micrometers. If the diameter exceeds 600 microns, problems such as a decrease in strength will occur when formed into a molded product.

The amount added is selected within the range of 0.1 to 100 parts by weight. If it is less than 0.1 part by weight, the effect of improving weather resistance will be weak;
If the amount exceeds 0 parts by weight, although the weather resistance is good, the PPS resin undergoes a crosslinking reaction, the viscosity increases, and molding becomes difficult, which is not practical.

These copper oxide and copper sulfide powders can be used alone or
Even a system mixed in any proportion can sufficiently exhibit its effect. Although the composition of the present invention is not an essential component other than the PPS resin and copper oxide and/or copper sulfide, it is also possible to add various fillers.

For example, fibrous materials such as glass fiber and carbon fiber, potassium titanate, etc. are used to improve mechanical strength and weather resistance.
Whiskers such as silicon nitride, zirconia, alumina, and gypsum are used. In addition, electrical properties 1 dimensional stability,
Calcium carbonate,
Talc, clay, silica, mica, alumina, glass beads, titanium oxide, carbon black, graphite,
Inorganic fillers such as molybdenum disulfide, fluororesins, organic polymer materials such as holamide, polyester, and polyimide can also be used.

The composition of the present invention can be produced by mixing and kneading PPS resin, copper oxide and/or copper sulfide, and optionally a filler using a conventional single-screw or twin-screw extruder to form pellets. will be adopted.

The pellets thus obtained are usually molded into molded bodies of various shapes by injection molding.

Alternatively, it can be formed into a pipe, a profile extrusion product, a film, a sheet, etc. by extrusion molding, or a T-die.

Copper compounds promote the decomposition of polymeric materials, which is commonly referred to as ginkgo.1. It was common knowledge that it was extremely harmful, but Li Fa and Ming were extremely unique in overturning this common sense, and their mechanism of action is completely unknown.
.

The composition of the present invention opens a new path to applications such as exterior parts, which were considered impossible for PPS resins, and its effects are extremely large.

The present invention will be specifically explained below using Examples. ,
.

Examples 1 to 3 Ry manufactured by Phillips Petroleum as PPS resin
tonP-4 6 to 9 (100 parts by weight), chopped glass fibers of length 5 to 4 to 9 (66.7 parts by weight), and cupric oxide powder (manufactured by Wako Pure Chemical Industries, Ltd.) at 0.06 kg (1 parts by weight), α5kg (5 parts by weight), 0.6 to 9 (10 parts by weight)
4. After adding and mixing uniformly with a mixer,
Kneading and pelletizing were performed using a 0 tnAn single screw extruder.

The resulting pellets were molded into 5×
A 25 x 120 strip test piece was heated to a mold temperature of 13
It was produced at 0°C.

This test piece was placed on an outdoor exposure stand facing south at an inclination angle of 35, and a 6-month outdoor exposure test was conducted.

The results are shown in Table-1.

Comparative Example 1 A test piece was prepared in the same manner as in Example 1 without adding copper oxide, and an outdoor exposure test was conducted for the same period.

The results are shown in Table-2.

Comparative Example 2 A test similar to Example 1 was conducted except that the amount of cupric oxide powder was changed to 5 g (105 parts by weight). The results are shown in Table 2.

Table-1 Δ: Slight change ×: Significant deterioration Table-2 Examples 4 to 6 By changing silver oxide to cupric sulfide powder (manufactured by Wako Pure Chemical Industries, Ltd.),
Tests similar to Examples 1 to 3 were conducted. The results are shown in Table-5.

Table-5

Claims (1)

[Scope of Claims] 1. A polyphenylene sulfide resin composition with excellent weather resistance, comprising 0.1 to 100 parts by weight of copper oxide and/or sulfide to 100 parts by weight of polyphenylene sulfide resin. thing. 1