反相悬浮缩聚制备阳离子凝胶球的工艺优化

Process optimization of the preparation of cationic hydrogel bead by inverse suspension polycondensation

以甲醛、丙酮和三乙烯四胺为主要原料,通过反相悬浮缩聚的方法制备了阳离子凝胶球.通过改变聚合反应中的分散剂种类、搅拌速率、反应温度和反应时间等反应条件,达到提升凝胶球的阳离子度并控制其粒径的效果,以此实现制备工艺的优化.实验结果表明,分散剂种类和搅拌速率变化对凝胶球粒径具有显著影响,而适当延长反应时间则可提高产物的阳离子度.最佳的反相悬浮缩聚条件是以OP-10为分散剂,在80℃水浴中以270 r/min的搅拌速率反应2 h,可得到最高阳离子度3.66mmol/g,粒径为1.2 mm的阳离子凝胶球.

A cationic hydrogel bead was prepared by inverse suspension polycondensation using formaldehyde,acetone and triethylenetetramine as raw materials. By changing the reaction conditions such as dispersant type,agitation speed,reaction temperature and reaction time,higher cationicity and better diameter control were achieved and the preparation processes were optimized. Experimental results showed that the diameter of the hydrogel bead was significantly affected by dispersant type and agitation speed. The cationicity of the hydrogel was enhanced by prolonging the reaction time. The optimal reaction conditions for inverse suspension polycondensation were as follows： OP-10 was used as dispersant,the agitation speed was 270 r / min,the reaction temperature and time were 80℃ and 2h,respectively.The cationicity and the diameter of prepared hydrogel bead were 3.66 mmol / g and 1.2mm,respectively.