JPH03764A - Polyphenylene sulfide resin composition - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a polyphenylene sulfide resin composition that has excellent heat resistance and at the same time excellent hinge properties.

[Conventional technology]

Conventionally, polyetheretherketone (PEEK) has been used as a material that has a heat resistance of 240℃ or higher and has hinge properties.
It has been known. However, polyphenylene sulfide (PPS) is well known as a heat-resistant resin that is extremely expensive and unsuitable for industrial use in large quantities.

However, the hinge properties were very poor and could not be used.

In recent years, the hinge properties of PPS have also been improved, but in order to have heat resistance for use above 240°C, it is necessary to increase the degree of crystallinity, and in this state, the hinge properties are insufficient.
It could not be used as is.

[Problem to be solved by the invention]

An object of the present invention is to provide a resin composition that has sufficiently improved hinge properties without deteriorating heat resistance.

[Means to solve the problem]

The present invention is a polyphenylene sulfide resin composition comprising 0.5 to 30 parts by weight of a silicone resin and 0.1 to 10 parts by weight of an epoxy resin to 100 parts by weight of polyphenylene sulfide.

The polyphenylene sulfide (hereinafter abbreviated as PPS) used in the present invention is a polymer containing the structural formula 1% or more, preferably 90% or more by mole, and if the repeating unit is less than 70% by mole, heat resistance will be impaired. Therefore, it is undesirable. PPS is generally a polymer with a relatively small molecular weight obtained by the production method typified by Japanese Patent Publication No. 45-3368, and an essentially linear polymer obtained by the production method typified by Japanese Patent Publication No. 52-12240. There are polymers with high molecular weight, and the above polymers can be used after increasing the degree of polymerization by heating in an oxygen atmosphere after polymerization, or by adding a crosslinking agent such as peroxide and heating. In the present invention, it is possible to use PPS obtained by any method, but in terms of the toughness of PPS itself,
An essentially linear polymer obtained by the production method typified by Japanese Patent No. 240 may be more preferably used.

Furthermore, less than 30 mol% of the repeating units of PPS can be composed of repeating units having the following structural formula, etc.

The melt viscosity of PPS used in the present invention is not particularly limited as long as it is possible to obtain molded products, but in terms of toughness of PPS itself, it is 100 voids or more, but in terms of moldability, it is 100 voids or more.
Those having a poise of 0.000 poise or less are more preferably used.

Moreover, usual additives such as antioxidants, heat stabilizers, lubricants, crystal nucleating agents, ultraviolet inhibitors, and colorants can be added to the PPS used in the present invention.

The silicone resin used in the present invention has i acid units 'i'R310i/a, RtsiO+R35io+8,
Sin, is established. Here, R refers to a methyl group, a vinyl group, a methoxy group, an ethoxy group, a propoxy group, an acetoxy group, an alumoxy group, an oxime group, an amide group, an aminoxy group, an isopropenoxy group, etc., and one or
In silicone resins having two or more types of substituents, these structural units are bonded to each other by 3l-0-Si bonds, and the ratio R/St of the number of substituents to St atoms is 1 to 1.7. In addition, silicone resins can undergo condensation reactions such as heating dehydration condensation reaction, room temperature humidity curing reaction, x-alkoxy group, ketoxime group, acetoxy group, etc.
There are reaction types such as aminoxy group, addition reaction type Sn, and peroxide curing reaction type, but in the present invention, addition reaction type or peroxide curing reaction type is used.

The viscosity of the silicone resin used in the present invention at room temperature is 5 to 10,000 poise, preferably 500 poise.
~? ,000 poise is good.

Furthermore, if the amount of silicone resin is less than 0.5 parts by weight, the effect of imparting toughness and hinge properties will be small, and if it is more than 30 parts by weight, the mechanical strength will be low, which is not practical. Liquid or solid materials containing two or more can be used, such as bisphenol-based epoxy resins, alicyclic epoxy resins, novolac-type epoxy resins, diglycidyl ester-type resins, and the like. Brominated urethane modified products of these epoxy resins can also be used.

In the present invention, the function of silicone resin is to impart flexibility. However, since silicone resin has poor compatibility with PPS, it is not possible to create a flexible and hinged material with enough strength for practical use using the two components PPS and silicone resin.

The epoxy resin added as a third component acts as a compatibility enhancer for both PPS and silicone resin, making it possible to create a flexible material with heat resistance and hinge properties that can withstand practical use. be.

The amount of the epoxy resin is preferably 0.1 to 10 parts by weight to obtain a compatible effect. If it is less than 0.1 part by weight, the compatibility effect will be poor, and if it is more than 10 parts by weight, the mechanical strength will be reduced.

In addition, the composition of the present invention may include various materials normally added to PPS resins, such as glass fibers, carbon fibers, inorganic fibers such as whiskers, calcium carbonate, talc,
Inorganic additives such as clay, wollastonite, asbestos, mica, and zinc oxide, various pigments such as titanium oxide and carbon black, antioxidants, anti-aging agents, lubricants, processing aids, etc. can also be added.

〔Example〕

Examples will be described below.

For the pellets obtained by kneading the formulation shown in Table 1 using a twin screw extruder with a diameter of 30 mm, after injection molding,
The results of measuring tensile strength, elongation, and eye shift impact strength are shown in Table 1.

(Effects of the Invention) The PPS composition according to the present invention has a PP composition as shown in Examples.
It can be seen that it gives a much larger elongation value than the S resin alone, and also has excellent isot impact strength. In this way, a PPS resin composition with toughness and hinge properties that had never been seen before was obtained.

Claims (1)

[Claims] (1) A polyphenylene sulfide resin composition comprising 0.5 to 30 parts by weight of a silicone resin and 0.1 to 10 parts by weight of an epoxy resin to 100 parts by weight of polyphenylene sulfide.