A kind of efficient synthetic method of polyphenylene sulfide resin

Abstract

The invention provides an efficient synthesis method of polyphenylene sulfide resin. The efficient synthesis method includes the steps of: (1) dissolving a sulfur source in NMP, performing dehydrationtreatment through inert gas protection with the presence of a catalyst and an alkali to obtain an intermediate and a residual mixed solution obtained after dehydration, and adding p-DCB and NMP intothe intermediate for polymerization reaction to obtain polyphenylene sulfide resin mixture paste; (2) initially cooling the polyphenylene sulfide resin mixture paste, adding the residual mixed solution in a normal temperature state while stirring, controlling the cooling temperature, stopping adding the residual mixed solution when the internal temperature and / or pressure of a kettle is lowered toa certain value, and completing stirring; (3) after secondary cooling, discharging the stirred mixture paste to complete synthesis. The efficient synthesis method has the advantages that the stability of the melt index (MFR value) of the PPS resin can be improved, and the synthesis yield of the product can be increased; during reaction, the resin is easily separated from equipment, and energy conservation and high efficiency are achieved.

Description

technical field [0001] The invention relates to the technical field of organic polymer resin production, in particular to a high-efficiency synthesis method of polyphenylene sulfide resin. [0002] technical background [0003] Polyphenylene sulfide (PolyPhenylene Sulfide, hereinafter referred to as PPS) is a high-performance thermoplastic resin, which not only has the advantages of chemical corrosion resistance, high temperature resistance, good flame retardancy, and non-toxicity, but also has good physical and mechanical properties and Dimensional stability, it has a very wide range of applications in the production of mechanical and electronic components, fibers, films, etc. [0004] At present, the mainstream industrial production method of PPS resin is the sodium sulfide method, and its general synthesis process is: dissolving the sulfur source (sodium sulfide trihydrate, sodium sulfide pentahydrate, sodium sulfide nonahydrate, sodium hydrosulfide, etc.) in NMP (nitrogen...

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Problems solved by technology

But above-mentioned method prepares polyphenylene sulfide resin yield is lower, and some reason wherein comprises: in synthetic process, resin usually can appear obvious agglomeration phenomenon, further occurs a large amount of scarring phenomena, not only can lose more excellent products that reaction obtains , and during this process, the agglomerated or scarred resin will adhere to the reaction equipment, and even form a "barrel-shaped" agglomeration in severe cases to completely wrap some key parts of the reaction equipment, making it difficult to detach; and after the reaction, the resin melt index (MFR value ) is unstable, the particle size of the final product is not uniform, the quality control is unstable, etc.

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