Abstract: As a cationic agent，cationic polyacrylamide with quaternary ammonium group is used for pretreatment of cotton fabrics and the pretreatment results were influenced by the solution properties of the cationic agent. The viscosity and conductivity of the cationic agent were investigated，and the results were proven by the salt-free dyeing data of the cationic cotton. It was indicated that the value of reduced viscosity of the cationic agent with a low molecular weight was smaller，and the molecules of the cationic agent could be well distributed on the pretreated cotton，and good levelness of the dyed cotton was obtained. The number of the positive charges on the cotton pretreated with the cationic agent with high cationic degree increased because of its stronger ionizing power in aqueous solution，and the K/S value of the dyed cotton also increased.

Key words: cationic polyacrylamide with quaternary ammonium, solution properties, viscosity, conductivity, salt-free dyeing

摘要： 季铵型阳离子聚丙烯酰胺作为阳离子助剂处理棉纤维，其水溶液性质影响助剂在纤维上的处理效果。考察水溶液黏度性质和电导性质，用助剂处理后纤维的无盐染色效果进行证明。结果表明：分子量低的季铵型阳离子聚丙烯酰胺在水溶液中比浓黏度较小，用其处理纤维有利于助剂在纤维上分布均匀，染色纤维匀染性好；阳离子化度高的助剂在水溶液中电离能力较强，处理后纤维所带正电荷数量增加，染色纤维色深K/S值增大。

关键词: 季铵型阳离子聚丙烯酰胺, 水溶液性质, 黏度, 电导, 无盐染色