PROCESS FOR PREPARING POLYPHENYLEN SULFIDES

摘要

The polyphenylene sulfide of high Mw is prepared by (a) dissolving sodium sulfide in NMP in a dissolving tank(1) of 80-130deg.C; (b) removing 1.5-3.0M of crystal water within Na2S based on 1M Na2S from the 1st dehydrator(2) equipped with distillation tower(7) at 180-210deg.C and 1atm. for 1-2hrs.; (c) firstly synthesizing prepolymer from obtd. Na2S from (b) and melted p-dichlorobenzene in the 1st polymn. tank(3) equipped with melting tank(10) at 240-260deg.C and 7-15 atm. for 1-2hrs.; (d)completely removing remaining crystal water within prepolymer in the second dehydrator(4) at 200-220deg.C and 1atm. for 1-2hrs.; (e) continuously polymerizing obtd. cpd.. from (d) in the 2nd and 3rd polymn. tank(B,6) at 240-260deg.C and 7-13atm for 1-2hrs.