Method for synthesizing polyphenylene sulfide copolymer containing heteroaromatics

Abstract

The present invention discloses a synthetic method of heteroaromatics polyphenyl sulfur ether. The present invention adopts sodium sulfide and paradichlorobenzene and 2-(4-chlorine phenyl group)-5-chlorine phenyl benzimidazole as raw materials and N-methyl-2 pyrrolidone as solvent for condensation and polymerization under the role of alkali metal lacquer solvent, so as to produce the polyphenyl sulfur ether resin. The mol ratio between sodium sulfide and paradichlorobenzene and 2-(4-chlorine phenyl group)-5-chlorine phenyl benzimidazole is 1:0.6-0.9:0.4-0.1. The sequential process mainly includes: in the process of sodium sulfide dehydration stage, assistant lithium aluminum hydride is added; in the condensation and polymerization stage, 2-(4-chlorine phenyl group)-5-chlorine phenyl benzimidazole is added. The product provided by the present invention with excellent indexes of relatively low dispersion coefficient and narrow molecular weight distribution and oxygen index can be made into paint, injection mold, fiber and membrane and be widely applied to the fields of machinery, chemicals, oil, electronic apparatus, war industry and airspace.

Description

technical field

[0001] The invention belongs to the field of polymer material resin production. Background technique

[0002] High-performance polyphenylene sulfide has excellent chemical resistance and thermal stability at high temperatures, and has flame retardancy, insulation, radiation resistance and good mechanical properties. In order to explore the synthesis method of this material, researchers from all over the world have been working hard to find it.

[0003] Chinese patent CN200510022437.6 discloses a process method of fiber-grade polyphenylene sulfide resin, using sodium sulfide and p-dichlorobenzene (P-DCB) as raw materials, polycondensation under the action of an alkali metal catalyst to produce polyphenylene sulfide (PPS) ) monomer, using the following process flow and conditions: adding additive sodium borohydride in the dehydration stage; adding nitrodichlorobenzene or p-chlorobenzylamine in the polycondensation stage; finally adding regulator adipic acid. ...