高交联度聚苯乙烯微球聚合工艺的研究

Study on polymerization process of polystyrene microspheres with high crosslinking degree

以二乙烯基苯(DVB)为交联剂,通过悬浮聚合合成了主要粒径范围为0.425~0.850 mm的高交联度聚苯乙烯(PS)微球。考察了反应温度、反应时间、搅拌速率、分散剂种类及用量和水油质量比对微球粒径的影响,确定了最佳聚合工艺:采用分段升温且增加低温段反应时间,搅拌速率为110~130 r/min,主分散剂聚乙烯醇(PVA)质量分数为0.076%,助分散剂磷酸三钙(TCP)质量分数为0.053%,水油质量比为(2~2.6)∶1。

Using divinylbenzene(DVB) as crosslinking agent,high crosslinking polystyrene(PS) microspheres with a main particle size ranging from 0. 425 mm to 0. 850 mm are synthesized via suspension polymerization process.Impacts of reaction temperature and time,stirring speed,the type and amount of dispersant,water-oil ratio on the particle size of the microspheres are studied. The optimal polymerization process is determined as follows: the temperature increases stepwise and stays at low temperature range for longer time,stirring speed is in the range of 110-130 r·min^(-1),mass fraction of polyvinyl alcohol(main dispersant) is 0. 076%,the mass fraction of tricalcium phosphate(auxiliary dispersant) is 0. 053%,and water-oil ratio is(2-2. 6) ∶1.