Homo- and heteroflocculation of papermaking fines and fillers

被引：36

作者：

Porubská, J

Alince, B

van de Ven, TGM ^{[1
]}

机构：

[1] McGill Univ, Dept Chem, Pulp & Paper Res Ctr, Montreal, PQ H3A 2A7, Canada

[2] McGill Univ, Dept Chem Engn, Pulp & Paper Res Ctr, Montreal, PQ H3A 2A7, Canada

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2002年 / 210卷 / 2-3期

基金：

加拿大自然科学与工程研究理事会;

关键词：

polyethylenimine; fines; fillers;

D O I：

10.1016/S0927-7757(02)00370-9

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The effects of cationic polyethylenimine (PEI) on the colloidal stability of anionic fines (microcrystalline cellulose or thermomechanical fines), fillers (clay) and their mixtures in deionized and tap water were investigated, using a photometric dispersion analyzer. Measurements confirmed that PEI flocculates all used materials by charge neutralization. As expected, higher additions of PEI lead to electrostatic stabilization of microcellulose and clay suspensions, but it was not possible to stabilize the suspension of fines using high additions of PEI. This is ascribed to the mechanical entanglements of fibrillar fines. In tap water, much more PEI is needed to reach optimum flocculation conditions than in deionized water. Heteroflocculation between PEI-coated clay and fines takes place with a rate which, for high fines concentration and a constant clay concentration, is independent of fines concentration. A theoretical model for the heteroflocculation of fines with PEI-coated clay has been developed, which explains the observed trends. In essence, clay particles can act as bridging agents for fines flocculation. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：223 / 230

页数：8

共 27 条

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