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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。
Aiming at the problem that cationic polyacrylamide is often used as a retention aid in the wet end system of paper making, the amount of fresh water in the dilution process is too large, the CPAM is diluted with a hardwood kraft pulp slurry equivalent to the concentration of the net pulp to dilute the CPAM, Freeness Tester (hereinafter referred to as DFR) on this CPAM on the pulp dilution system (hereinafter referred to as the pulp dilution system) to help retention filter test. The results showed that with the increase of the amount of CPAM diluted with water and the amount of CPAM diluted with water, the effect of retention and drainage was better. The difference between the two was not significant. With the increase of pulp concentration, the single pass retention And the Zeta potential of the pulp gradually decreased. With the mixing time of dilution pulp and CPAM increasing, the one-way retention rate gradually decreased, and the CPAM-containing fibers isolated basically had no retention; the degree of beating of dilution pulp increased , Will result in reduced demand for the anionic diluent system, one-way retention rate will be reduced.