JPH03215560A - Resin composition - Google Patents

Abstract

PURPOSE:To obtain a resin composition which is less corrosive to the mold or the like during molding and prevented from forming a corrosive gas which adversely affects the mold by adding magnesium carbonate to a polyether sulfone resin. CONSTITUTION:0.01-20 pts.wt., desirably 0.1-10 pts.wt. magnesium carbonate is added to 100 pts.wt. polyether sulfone resin to obtain a heat-resistant resin composition which can be used for electrical and electronic components.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a heat-resistant resin molding material characterized by adding magnesium carbonate to polyethersulfone resin, and more specifically, This article relates to a polyether sulfone resin composition that can reduce corrosion of molds, etc. [Prior art and its problems] Polyether sulfone resin has excellent mechanical, thermal, and electrical properties, so it is molded using various molding methods and used for mechanical parts, electrical parts, etc. Widely used in electronic parts, etc. However, the processing temperature of polyether sulfone resin is quite high at 340 to 400"C, and at such high temperatures some metal corrosive gas is generated, which can corrode the mold and molding machine during the molding process. If molded products are aged at temperatures above 100°C, corrosive gases will be generated and metal parts will be corroded.Especially when used in the electrical and electronic fields, corrosive gases such as sulfur dioxide gas will be generated. This results in a decrease in the reliability of electronic components.In the past, attempts have been made to add zinc oxide, etc. to prevent the adverse effects of corrosive gases generated from resins, but no sufficient effect has been obtained. As a result, its use as a molding material and molded product is limited. [Means for solving the problem] In order to prevent the adverse effects of corrosive gas on molded products, the inventors of the present invention As a result of various studies, they discovered that the addition of magnesium carbonate to polyether sulfone resin was effective and completed the present invention.That is, the present invention is based on the addition of 0.0 parts by weight of magnesium carbonate to 100 parts by weight of polyether sulfone resin.
01 to 20 parts by weight of the resin composition. The polyether sulfone resin used in the present invention is a type obtained by a condensation reaction between an alkali phenolate group and an aromatic halogen resin activated with an electron-withdrawing sulfone group in an aprotic polar solvent. It is a linear polymer whose essential bonding units are arylene bonds (aromatic bonds), ether bonds, and sulfone bonds.

For example, the following structure is a very typical example. (1) -(10-■-SO21■1)1(3) -(-0be!TOSO 2beishinFOBeaxO-◇X)-(
5)
6) One (one (to)〈■toSO 2be distortion Σ《Stos02be huge obe huge and) (7) ? {'- 0-<ri-SO2beto O-(Σh C H
2-■→1 These polyether sulfone resins are disclosed in, for example, Japanese Patent Publication No. 40-10067 and Japanese Patent Publication No. 42-7799.
It can be easily produced by the method described in Japanese Patent Publication No. 47-617. Further, magnesium carbonate used in the present invention is usually (M
It has a chemical composition of gCO3) and is naturally produced as magnesite. In addition, mMgco■・nMg (
Basic salts with structures such as OH) z ・xH20 are also included in magnesium carbonate.

The amount of magnesium carbonate added in the present invention is 0.01 to 20 parts by weight, preferably 0.1 to 10 parts by weight, per 100 parts by weight of the polyethersulfone resin.

If the amount added is too small, there will be almost no effect of reducing corrosive gases.On the other hand, if it is used in excess of 20 parts by weight, the effect of reducing corrosive gases will be sufficient, but the fluidity will decrease and the moldability will be affected. This is not desirable because it causes problems. The polyethersulfone resin according to the present invention is generally molded as follows. Polyether sulfone resin and additives are mixed using a mixer such as a Henschel mixer, and then kneaded using a hot roll, extruder, etc. to form a molding material. This molding material is preferably used as a pellet. Next, the berent or the like is molded using a molding machine such as an injection molding machine.

In the present invention, fillers such as talc, Myriki, and glass beads may be added to the polyether sulfone resin molding material, if necessary.
Various additives such as glass fibers, carbon fibers, potassium titanate fibers, aramid fibers, ceramic fibers, etc., stabilizers, ultraviolet absorbers, colorants, mold release agents, etc. may impair the quality of the resin composition. They may be mixed as long as they are not mixed. [Examples] Hereinafter, the present invention will be explained in detail with reference to Examples, but these are merely illustrative and the present invention is not limited thereto.

Examples 1 to 4 and Comparative Examples 1 to 3 VICTREX PE as polyether sulfone resin
S3600P (trademark, Imperial Chemical Industries Ltd., UK) powder and various additives were blended in the proportions shown in Table 1, and dry blended using a Henschel mixer.

This mixture was extruded using a twin-screw extruder at a cylinder temperature of 320°C.
It was extruded at ~350°C to obtain a uniform berent-like molding material. As shown in FIG. 1, 10 g of the bellet and steel material were placed in a glass container, heated at 380'C for 24 hours, and the degree of discoloration of the steel material was observed.

Further, the fluidity of each sample was determined based on the melt index (hereinafter referred to as Ml value) in accordance with JIS K7210. Furthermore, the cylinder temperature is 330~
Injection molding was carried out at 360°C. Crush the molded product, put 10g into an Erlenmeyer flask as shown in Figure 2, and put 5.
X5mmO copper foil was suspended in a high temperature bath at 150°C for 10 minutes.
After standing still for 0 hours, the degree of discoloration of the copper foil was observed, and the results shown in Table 2 were obtained.

The criteria for discoloration shown in Tables 1 and 2 are 3: Severe discoloration. 2: Significant discoloration 1: Slight discoloration 0: No discoloration It was shown more.

〔Effect of the invention〕

The polyether sulfone resin molding material according to the present invention is effective in preventing the adverse effects caused by the generation of corrosive gases, making it possible to reduce maintenance costs for molds and molding machines during injection molding and extrusion molding. ．． Further, various molded products made of the polyether sulfone resin of the present invention can be used for electrical and electronic parts because the generation of corrosive gases is suppressed, and the present invention is of great significance.

4. Explanation of the Drawings Figure 1 shows a sample using a pellet-shaped molding material (sample) obtained from a polyethersulfone resin composition. gCoff... 111V (4MgCO, .1g (OH
)2.511■0) ZnO...every Φj■
3 Ipi t) and O 7 k Te A;
! IfJs Cow Cruelty = 320°C Load: 2
．． 16kg Table 2 This is a schematic diagram showing the discoloration test of steel materials, each number is 1
: Metal can 2: Metal can 3: Sample 4: Steel material. FIG. 2 is also a schematic diagram showing a discoloration test of copper foil using a sample, and each number indicates 1: Erlenmeyer flask, 2: silicon stopper, 3: sample, and 4: copper foil.

Claims (1)

[Claims] A polyethersulfone resin composition characterized in that 0.01 to 20 parts by weight of magnesium carbonate is added to 100 parts by weight of the polyethersulfone resin.