Film-grade polyphenylene sulfide resin and preparation method thereof

Abstract

The invention discloses film-grade polyphenylene sulfide resin. The film-grade polyphenlene sulfide resin is mainly prepared from sodium sulfide, alkali metal hydroxides, a catalyst, p-dichlorobenzene and meta dichlorobenzene which are reacted in the environment of 220-260 DEG C for 3-6 hours. The invention further provides a preparation method of the resin, and the method comprises the steps that 1, the sodium sulfide and the alkali metal hydroxides are stirred and dispersed in solvent NMP, and after dehydration is conducted, a mixture is obtained; 2 the solvent NMP, the catalyst, the p-dichlorobenzene and the meta dichlorobenzene are added to the mixture, heating is conducted to make the temperature range from 220 DEG C to 260 DEG C to conduct polymerization for 3-6 hours, and the film-grade polyphenylene sulfide resin is obtained. According to the film-grade polyphenylene sulfide resin, an adequate amount of the meta dichlorobenzene is added when the PPS resin is compounded by taking the p-dichlorobenzene as the raw material, a linear type polyphenylene sulfide molecular chain is changed into an elastic polyphenylene sulfide molecular chain with a bend structure, and the transverse tensile capacity of a polyphenylene sulfide film prepared from the resin is enhanced. In addition, the weight-average molecular weight of a polymer is controlled by controlling the reaction temperature and the reaction time, and the thickness of the formed film is more even.

Description

technical field [0001] The invention relates to a production and synthesis process of a polymer material, in particular to a film grade polyphenylene sulfide resin and a preparation method thereof. Background technique [0002] Polyphenylene sulfide (English: Polyphenylenesulfide; abbreviation: PPS) is a high-performance thermoplastic resin with excellent heat resistance, thermal stability, excellent corrosion resistance and chemical resistance, and also has a very low dielectric strength. Electrical constant, excellent insulation in high temperature and high humidity environment. Therefore, polyphenylene sulfide, as an emerging engineering plastic, has been widely used in electronics, aerospace, automobiles, home appliances, machinery and other fields. Film grade polyphenylene sulfide resin can be made into film by calendering method, stretching method, etc. [0003] Due to the excellent performance of polyphenylene sulfide film, it is widely used in: ① Electrical insulat...

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Problems solved by technology

[0004] At present, the common polyphenylene sulfide resin is polycondensed by nucleophilic substitution reaction of p-dichlorobenzene and sodium sulfide in a polar solvent. Its polymer chain is linear and regular in structure, and has good longitudinal tensile properties. However, the lack of elasticity and poor transverse tensile properties limit its application in films

The main problems are: the weight average molecular weight is too small, the molecular weight distribution is not concentrated, the thickness of the film produced is uneven, and the transverse stretching ability is insufficient

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