反相悬浮聚合工艺制备吸水树脂及其性能研究

Preparation and Characterization of Superabsorbent Polymer by Reverse Phase Suspension Polymerization

采用反相悬浮聚合工艺制备聚丙烯酸钠吸水树脂,研究了分散剂和搅拌转速对反相悬浮聚合体系稳定性的影响以及丙烯酸中和度、阻聚剂和交联剂对树脂吸水性能的影响。结果表明:采用聚甘油单硬脂酸酯为分散剂、搅拌转速300～450r/min时,反相悬浮聚合体系稳定性好、制得分散性良好的均匀珠状吸水树脂;以聚乙二醇二缩水甘油酯(400)为交联剂,制得吸水树脂水溶性组分质量分数小于4%;丙烯酸中和度(摩尔分数)为80%时,树脂的吸水倍率与吸生理盐水倍率达到最大值,分别为683和68;丙烯酸中存在的阻聚剂对羟基苯甲醚不会影响树脂的吸水性能。

Superabsorhent polymer （SAP） of poly （sodium acrylate） was prepared by reverse phase suspension polymerization. The influences of suspension agent and agitation speed on reverse phase suspension polymerization system and the influences of the degree of neutralization of acrylic acid, inhibitor and crosslinker on the absorption capacity of the polymer were studied. A stable reverse phase suspension polymerization system with spherical particles was achieved by using polyglycerol monostearates as suspension agent at the agitation speed of 300 ～ 450 r/ min. When polyethylene glycol diglycidic ester （400） was used as crosslinker, the mass fraction of dissoluble polymers in the SAP was less than 4wt%, and when the degree of acrylic neutralization was 80%, the deionizing water absorption and normal saline absorption were the maximum, being of 683 g/g and 68 g/g respectivly. The phydroxyanisole inhibitor in acrylic acid had no influence on the property of SAP.