Method for producing bisphthalonitrile terminated diphenyl sulfide oligomer

Abstract

The invention relates to a method for producing bisphthalonitrile terminated diphenyl sulfide oligomer, belonging to the field of high molecular synthetic materials. The method comprises the following steps: separating and purifying slurry generated in the processes of ployphenylene sulfite (PPS) resin production and product purification so as to recover a mixture of polyphenylene sulfide oligomer and residual PPS resin; carrying out cracking and thiol-termination on the mixture to obtain dithiol-terminated polyphenylene sulfide oligomer; and synthesizing the dithiol-terminated polyphenylene sulfide oligomer with 4-nitrophthalonitrile, so as to obtain the bisphthalonitrile terminated diphenyl sulfide oligomer. In the invention, the method is simple, the yield is high, and the useful byproducts in the discharged slurry (waste slag) can be fully utilized, thereby effectively overcoming the pollution of the waste slag on environment and restriction of the waste slag on production scale and reducing the production cost of enterprises; and the prepared bisphthalonitrile terminated diphenyl sulfide oligomer can be used for producing phthalonitrile with a phthalocyanine ring structure and the like.

Description

Technical field [0001] The invention belongs to a method for producing bisphthalonitrile-terminated phenylsulfide oligomers in the field of polymer synthetic materials, and particularly relates to a by-product and 4-nitrophthalene sulfide produced in the production process of polyphenylene sulfide. A method for producing bis-phthalonitrile end-group phenyl sulfide oligomer with dimethyl cyanide as a raw material. Background technique [0002] In the production process of polyphenylene sulfide (PPS), a slurry containing 6-8wt% phenylene sulfide oligomer and 0.5wt% of residual PPS resin by-products will be produced after solvent recovery. The amount of slurry generally accounts for 12-15 wt% of the input amount of production raw materials. For the treatment of these by-products, the conventional method is to first concentrate them into ore mud, and then directly incinerate or discard them as waste; the former requires high energy consumption and will also cause air pollution, whil...

AI Technical Summary

Problems solved by technology

Therefore, the above-mentioned background technology has defects such as outdated method for recovering phenylene sulfide oligomers, cumbersome process, high energy consumption, and failure to effectively utilize the recovered PPS resin in the recovered phenylene sulfide oligomers and by-products.