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造纸助留助滤剂顾名思义是改善纸机网部纤维和细料留着并兼有助滤作用的化学品,其直接改变白水和造纸浆料的性质,从而影响整个抄纸过程。在所用的湿部助剂中,助留助滤剂是技术含量最高、最依赖使用经验的一类化学品。目前常用的助留助滤剂主要有以下两大类:常规助留助滤剂-包括单元和双元系统,它们的特征是高聚物加在纸机压力筛出口,以高聚物为主,之前可添加明矾、聚合氧化铝(PAC)或定着剂,常规的定着剂为聚胺(polyamine)、聚二烯丙基二甲基氯化铵(polydadmac)和聚乙烯亚胺;微粒助留助滤剂-由阳离子聚丙烯酰胺和微粒子组成,微粒子是最后加入的化学品,常用的微粒子为膨润土(bentonite),胶体硅(silica)和有机微聚物(micropolymer)。本文将重点介绍有机聚合物微粒在助留助滤体系中有关专利技术的发展概况。
Paper retention filter aid, as the name implies, is to improve the paper machine net Department of fibers and fine materials remain and help the filter effect of chemicals, which directly change the nature of white water and paper pulp, thus affecting the entire papermaking process. Of the wet-end auxiliaries used, retention and retention aids are the most technologically-advanced and most dependent on a class of chemicals. At present, there are two main types of retention and drainage aids commonly used in the art: conventional retention and retention aids - including units and dual systems, which are characterized by the addition of a polymer to the outlet of a paper machine pressure screen to polymer , Prior to the addition of alum, polyaluminum oxide (PAC) or a fixing agent, the conventional fixing agents are polyamine, polydadmac and polyethyleneimine; The filter aid - consists of cationic polyacrylamide and fine particles, which are the last to be added chemicals. Bentonite, colloidal silica and organic microparticles are commonly used as microparticles. This article will focus on organic polymer particles in the retention aid filter system in the patented technology development overview.