The flocculation mechanism of microparticulate retention aid systems

被引：0
|
作者：
Asselman, T
Garnier, G
机构：
[1] McGill Univ, Dept Chem Engn, Montreal, PQ H3A 2A7, Canada
[2] McGill Univ, PAPRICAN, Montreal, PQ H3A 2A7, Canada
来源：
JOURNAL OF PULP AND PAPER SCIENCE | 2001年 / 27卷 / 08期
关键词：
kinetics; retention aids; fines; deposition; bentonite; cationic compounds; acrylamide; polyacrylics; flocculation; reaction mechanism;
D O I：
暂无
中图分类号：
TB3 [工程材料学]; TS [轻工业、手工业、生活服务业];
学科分类号：
0805 ; 080502 ; 0822 ;
摘要：
We have investigated the kinetics of fines deposition on pulp fibres with a cationic poly(acrylamide) (CPAM)/bentonite (montmorillonite) retention aid. Different CPAM/montmorillonite bridging configurations between fibres and fines were studied and compared with single polymer layers. The results show that montinorillonite platelets increase the bond strength of adsorbed polymer layers on fibres and fines, and reduce the polymer transfer between surfaces. Moreover, montinorillonite platelets are effective bridging agents between "inactive" polymer layers. The mechanism of these flocculants is explained in terms of surface charge densities and polymer layer-conformations. These results provide indications for the optimization of these systems in mill conditions.
引用
收藏
页码：273 / 278
页数：6
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