以氯丁胶乳为原料,采用直接凝聚法制备粉末氯丁橡胶(PCR-244),研究了体系pH值、凝聚剂和隔离剂用量、凝聚温度、搅拌转速对PCR-244凝聚效果的影响,并与块状氯丁橡胶进行了对比.结果表明,在体系pH值为11～13、凝聚剂和隔离剂用量分别为20份和10～15份以及凝聚温度为20～25℃、搅拌转速为80～100 r/min的条件下,能得到平均粒径小于0.80 mm、成粉率达100%的PCR.相同条件下,PCR比块状氯丁橡胶的溶解速率大大提高,但二者溶解后的溶液黏度和剥离强度相近.PCR-244仅仅改变了氯丁橡胶的形态,其内部主要结构与块状氯丁橡胶相似.%The powdered polychloroprene rubber (PCR-244) was prepared by direct coacervation with neoprene latex as material. The effects of pH value, the amount of coagulant and antiadhesion agent, the coacervation temperature, stirring speed on the powdering were investigated, and the comparison was carried out with lump polychloroprene rubber (CR-244). The results showed that PCR of the diameter less than 0.80 mm and powder ratio of 100％ could be obtained when pH value was 11 - 13 in the system, the amounts of coagulant and antiadhesion agent were 20 phr and 10 - 15 phr respectively, coacervation temperature was 20 - 25 ℃, stirring speed was 80 - 100 r/min. Under the same conditions, the dissolution rate of PCR-244 increased greatly, while solution viscosity and peeling strength were similar compared with lump CR-244.So the preparation processs of PCR-244 only changed the geometric form of the latter, but not changed its main internal structure.
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