复合离子型乳化剂对淀粉接枝丙烯酰胺的聚合反应作用

采用反相乳液聚合法,合成了淀粉接枝聚丙烯酰胺的反相乳液产品,研究了反相乳液聚合工艺条件。考察了乳化剂种类,乳化剂组成、乳化剂用量以及乳液形成方式对单体转化率、接枝率、乳胶粒径和产品特性黏度的影响。结果表明,以脂肪酸(盐)为乳化剂,乳液具有良好的稳定性和低温溶解性;将表面活性剂进行复配得到的混合乳化剂的乳化效果优于单一乳化剂。以油酸与油酸钠复配物为乳化剂时,合成了单体转化率98%,接枝率80%,特性黏度1 300 mL/g的淀粉接枝丙烯酰胺反相乳液产品。考察了过硫酸铵、过硫酸铵-尿素引发剂体系对单体转化率、产品特性黏度的影响。

Effect of Mulriple Ionic Emulsifier on Synthesis of Starch Graft Acrylamide Copolymer

Starch graft acrylamide copolymer was synthesized by inverse emulsion polymerization,and the polymerization process conditions were studied.The effects of types,composition amount of emulsifiers and emulsification methods on the monomer conversion rate,grafting ratio,latex particle size and the intrinsic viscosity of the product were investigated.It showed that the emulsion is of good stability and solubility at low temperature with fatty acid（salt） as emulsifier,and the mixing emulsifier of surfactants reveals better emulsification property than a single emulsifier.So we synthesized the starch graft acrylamide with the monomer conversion rate 98%,the graft ratio 80% and the intrinsic viscosity 1300 mL/g by inverse emulsion polymerization using the mixture of oleic acid and sodium oleate as emulsifier.The effects of three kinds of initiators,including ammonium persulfate,ammonium persulfate-urea on the monomer conversion rate and the intrinsic viscosity were investigated.