JPH03199264A - Resin composition - Google Patents

Abstract

PURPOSE:To provide a polyether sulfone resin composition depressed in the generation of corrositive gases in the molding processing of the resin to reduce the corrosion of molds and capable of being employed for electric and electronic parts by adding gamma-alumina to a polyether sulfone resin. CONSTITUTION:(A) 100 pts.wt. of a polyether sulfone resin, a linear polymer, having arylene bonds, ether bonds and sulfone bonds as essential bond units is compounded with (B) 0.01-20 pts.wt., preferably 0.1-10 pts.wt., of gamma-alumina, an intermediate alumina or alumina anhydride, prepared by dehydrating alumina hydrate and further, if necessary, with a filler such as talc or mica, a fibrous reinforcing material such as glass fibers or carbon fibers, a stabilizer, an UV ray absorbent, etc., followed by mixing with a Henschel mixer, etc., and kneading with an extruder to provide a molding material.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a heat-resistant resin molding material characterized by adding T-alumina to polyethersun resin, and more specifically, This invention relates to a polyether sulfone resin #Ji sole that can reduce corrosion of molds, etc.

[Conventional technology and its problems]

Polyether sulfone resin has excellent mechanical, thermal, and electrical properties, so it is molded using various molding methods and is widely used in mechanical parts, electrical and 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 100° C. or higher, corrosive gases are generated and metal parts are corroded. Particularly when used in the electrical and electronic fields, the reliability of electronic components is reduced due to the generation of corrosive gases such as sulfur dioxide gas.

In the past, attempts have been made to add zinc oxide, etc. to prevent the negative effects of corrosive gases generated from resins, but as sufficient effects cannot be obtained, their use as molding materials and molded products is limited. situation.

[Means for solving problems]

In order to prevent the adverse effects of corrosive gases on molded products, the inventors of the present invention have conducted various studies and have found that the addition of T-alumina to polyether sulfone resin is effective, and have completed the present invention.

That is, the present invention uses polyether sulfone resin 100
! It is a resin & Itc product characterized by adding 0.01 to 20 parts by weight of T-alumina to i parts.

The polyether sulfone resin used in the present invention is a type obtained by a condensation reaction between an alkali ferulate group and an aromatic halogen group activated with an electron-withdrawing sulfone group in an aprotic polar solvent. It is a linear polymer that has three essential bonding units: arylene bonds (aromatic bonds), ether bonds, and sulfone bonds.

For example, the following structure is a very typical example.

(1) -(-0-O-S(h-■-)-CH ko(2) To(-0-■-5Ovo-0-o-C-■-
)-Hz (3) -(-0-O-SOa-■-0-■-0-■
-)-Hs (4) -(-□-■-S Oz -0-■-0-■
-C-00-)-Hi (5) -(-〇-■-502-■-0-O-■-)-(6) -(-o-O-s02-■-■-5O2-■- 0-00
-) -(7) 1-o-O-so2-■-o-O-c
H2-■-)-These polyether sulfone resins are disclosed in, for example, Japanese Patent Publication No. 40-10067 and Japanese Patent Publication No. 42-77.
It can be easily produced by the method described in Japanese Patent Publication No. 99 and Japanese Patent Publication No. 47-617.

Furthermore, γ-alumina used in the present invention means intermediate alumina or anhydrous alumina, such as ρ-alumina.
・There are aluminas with crystal structures such as χ, η, δ, and θ types2, which are produced by dehydration of aluminum hydrates,
Further, by firing at a high temperature, it changes to the most stable α-alumina.The amount of r-alumina added in the present invention is 0 to 100 parts by weight of the polyethersulfone resin.
．． 0.1 to 20 parts by weight, preferably 0.1 to 10 parts by weight. 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. The polyether sulfone resin and additives are mixed with a mixer such as a Henschel mixer, and then kneaded with a hot roll, extruder, etc. to form a molding material. This molding material is preferably used in the form of pellets.Then, the pellets are molded using a molding machine such as an injection bottom molding machine.

In the present invention, if necessary, fillers such as talc, mica, and glass beads are added to the polyether sulfone resin acid type material.
Various additives such as glass fibers, carbon fibers, potassium titanate fibers, aramid fibers, ceramic fibers, etc., stabilizers, ultraviolet absorbers, colorants, and mold release agents are added to the resin.
They may be mixed as long as the quality of the tc material is not impaired.

〔Example〕

Hereinafter, the present invention will be described 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
53600P (trademark, Imperial Chemical Industries Ltd., UK) powder and various additives were blended in the proportions shown in Table 1 and triblended using a Henschel mixer.

This mixture was extruded using a twin-screw extruder at a cylinder temperature of 320°C.
A uniform pellet-shaped molding material was obtained by extrusion at ~350°C.

10 g of the pellets were placed in a glass container together with a steel material as shown in FIG. 1, 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 MI value) in accordance with JIS K7210.
Furthermore, the cylinder temperature is 33 for the above pellets.
Injection molding was performed at 0-360°C. The molded product was crushed, and as shown in Fig. 2, 10 g was placed in an Erlenmeyer flask, with a 5 x 5 mmO copper foil suspended therein, and placed in a high-temperature bath at 150°C for 100 hours to prevent discoloration of the copper foil. Table 1 α-Alumina...Junsei Kagaku Co., Ltd. product ZnO...
Banton J1 Sanihi! 1shi1zu1jjko$M1hama1耘hi d
Akisada Ushinuma・・・320°C load・・・2.1
6kg Table 2 Observation was made 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 l: Slight discoloration 0: No discoloration More shown.

〔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.
It is possible to reduce maintenance costs for molds and molding machines during injection molding and extrusion molding. In addition, various molded products molded with the polyether sulfone resin of the present invention can be used for electrical and electronic parts because the generation of corrosive gas is suppressed. It is a schematic diagram showing a discoloration test of steel materials using a pellet-shaped molding material (sample) obtained from the above, and each number is 1: Metal can.
2: Metal can 3: Sample 4: TG4 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 γ-alumina is added to 100 parts by weight of the polyethersulfone resin.