Method for preparing polyarylene sulfide with reduced free iodine content

摘要

The present invention relates to a method for preparing polyarylene sulfide with a reduced free iodine content. More specifically, the method for preparing polyarylene sulfide includes: (a) polymerizing reactants including a diiodo aromatic compound and a sulfur compound to form a polyarylene sulfide; and (b) maintaining the polyarylene sulfide product at 100 to 260° C. for heat-setting. The preparation method of the present invention effectively reduces the free iodine content of the polyarylene sulfide to prevent potential corrosion of facilities for the subsequent process and improves the properties of the polyarylene sulfide product such as thermal stability, so the method can be usefully applied to industrial fields in regard to the preparation of polyarylene sulfide.

主权项

1. A method for preparing a heat-set polyarylene sulfide having a melting temperature of 265 to 320° C. and a free iodine content of at most 20 ppm, comprising:
(a) polymerizing reactants including a diiodo aromatic compound, a polymerization inhibitor, and a sulfur compound at an initial temperature of 180° C. to 250° C. and at a final temperature of 270° C. to 350° C. to form a polyarylene sulfide product; and (b) maintaining the polyarylene sulfide product at 150° C. to 230° C. for heat-setting for 0.5 to 100 hours to give a heat-set polyarylene sulfide; wherein: the heat-set polyarylene sulfide has a melting temperature of 265° C. to 320° C. and a free iodine content of at most 20 ppm; the heat-set polyarylene sulfide has a melting temperature variation of less than 5% before and after the heat-setting step (b); and the polymerization inhibitor is at least one of N-cyclohexylbenzothiazole-2-sulfenamide, N,N-dicyclohexyl-2-benzothiazole sulfenamide, tetramethylthiuram monosulfide, tetramethylthiuram disulfide, zinc dimethyldithiocarbamate, zinc diethyldithiocarbamate, and diphenyl disulfide.