用上网浆料稀释CPAM分散体系的助留助滤性能

Properties of Retention and Drainage for Cationic Polyacrylamide Based on Water Dilution Using Pulps

针对造纸湿部系统常用助留剂阳离子聚丙烯酰胺在稀释过程中,清水用量过大的问题,采用与上网浆浓度相当的阔叶木硫酸盐浆悬浮液取代清水对CPAM进行稀释,利用滤水保留游离度测试仪(以下简称DFR)对这种CPAM上网浆稀释体系(以下简称浆稀释体系)进行助留助滤测试。结果表明,随着浆稀释CPAM与清水稀释CPAM的用量增加,均表现出较好的助留助滤效果,两者差距不大;随着浆稀释体系稀释用浆浓度的提高,单程留着率逐渐降低,浆料Zeta电位也逐渐降低;随着稀释用浆与CPAM混合时间的延长,单程留着率逐渐降低,分离出的吸附有CPAM的纤维基本无助留作用;稀释用浆打浆度提高,会造成浆稀释体系阴离子需求量降低,单程留着率也会降低。

In order to solve the problem of substantial water solution, the hardwood kraft suspensions were used for solution of cationic polyacrylamide （CPAM）. The DFR was applied to test the retention and drainage of CPAM-suspensions solutions. The results showed that the effects of retention and drainage were perfect and similar with increasing dosage of CPAM-suspensions solutions and CPAM solved by water; single-pass retention and Zeta potantial decreased as suspensions consistency increased; single-pass retention decreased as mixing time of suspensions and CPAM increased, and the fibers separated from CPAM-suspensions solutions had no effect at retention; anionic demand and single-pass retention decreased with increasing beating degree of suspensions.