A particle size of polyarylene sulfide obtained in polymerization is controlled by a process characterized in that a gaseous phase part of a reactor is cooled or heated after starting decreasing a temperature of a reaction system o an end of precipitation of polyarylene sulfide formed In an embodiment, a water content in the reaction system is 0.8 to 1.7 moles per mole of the alkali metal sulfide; the gaseous phase part of the reactor is cooled in a polymerization stage to thereby condense a part of a gaseous phase in the reactor and the condensed liquid is refluxed to a liquid phase in the reactor; and the gaseous phase part is only cooled after starting decreasing the temperature of the reaction system, whereby high molecular weight polyarylene sulfide suitable for powder coating is formed, which has a weight average molecular weight of at least 30,000 and an average particle size of 50 to 80 µm, wherein particles of 40 to 150 µm account for at least 90 % by weight of the whole particles in a particle size distribution, and the amount of particles of 180 µm or more is 0.5 % 1by weight or less.
聚合过程中获得的聚芳基
硫醚的粒度由一种工艺控制,该工艺的特征在于,在开始降低反应体系的温度后,冷却或加热反应器的气相部分,直到形成的聚芳基
硫醚沉淀结束。7摩尔/摩尔碱
金属
硫化物;在聚合阶段冷却反应器的气相部分,从而冷凝反应器中的部分气相,冷凝液在反应器中回流至液相;在开始降低反应系统的温度后才冷却气相部分,由此形成适合粉末涂料的高分子量聚芳基
硫醚,其重量平均分子量至少为 30,000 和平均粒径为 50 至 80 微米,其中 40 至 150 微米的颗粒在粒径分布中至少占整个颗粒重量的 90%,180 微米或以上的颗粒量为 0.5 % 1 (按重量计)或更少。