聚羧酸系高性能减水剂对高铝浇注料基质浆体ζ电位的影响研究  

Influence of Polycarboxylate Superplasticizers on the ζ Potential of Matrix Paste for Low Cement Castable

作　　者：李柱凯[1,2] 何廷树[1] 黄晓燕[2] 

机构地区：[1]西安建筑科技大学材料科学与工程学院,西安710055 [2]四川建筑职业技术学院材料工程系,德阳618000

出　　处：《硅酸盐通报》2013年第5期858-862,共5页Bulletin of the Chinese Ceramic Society

摘　　要：本文采用BDL-B型表面电位粒径仪,测定了高铝浇注料基质浆体在不同减水剂作用下的ζ电位;采用NXS-11A旋转粘度计测量了浇注料基质浆体的粘度,研究了减水剂对基质浆体ζ电位及粘度的影响。研究表明,加入适量的减水剂,能降低体系的ζ电位与粘度,ζ电位与粘度具有相似的变化规律。从理论上分析了浆体粒子吸附减水剂、扩散双电层与ζ电位的形成机理。STP、KS-20均为阴离子型分散剂,吸附于浆体粒子表面,ζ电位降低,通过静电斥力作用达到分散效果,KS-JS70、LMS-P为非离子型减水剂,依靠聚氧乙烯链吸附于粒子表面,通过空间位阻作用达到分散效果。随着减水剂加入量的增加,减水剂在粒子表面吸附达到饱和,ζ电位变化趋于平缓。In this paper,the methodology and experimental summary of investigation into the influence of different superplasticizers on the zeta potential and viscosity are presented and analyzed.the zeta potential was determined using BDL-B Surface potential and particle size analyzer,the viscosity was determined using NXS-11A rotary viscometer.Studies have shown that the zeta potential and viscosity are significantly reduced with adding the superplasticizer and have a similar variation.This paper analyzes the mechanisms of the slurry particles adsorption superplasticizer,the formation of the proliferation electric double layer and zeta potential.STP,KS-20 are anionic dispersing agent,adsorbed on the surface of the slurry particles,ζ potential decreased to achieve the dispersing effect by electrostatic repulsion;KS-JS70,LMS-P are nonionic superplasticizer,adsorbed to the particle surface relying on the polyoxyethylene chain to achieve the dispersing effect by steric hindrance.With the amount of superplasticizer increased,superplasticizer adsorption reached saturation in the surface of the particles,ζ potential changes flatten.

关 键 词：减水剂 基质浆体 Ζ电位 粘度 

分 类 号：TQ175.732[化学工程—硅酸盐工业]