磺化木质素蜜胺甲醛超塑化剂对水泥颗粒的分散稳定机理

Action Mechanism of Lignosulfonate Modified Sulfonated Melamine Formaldehyde Resin on the Dispersion and Stabilization of Cement Particles in Water

系统研究了磺化木质素蜜胺甲醛超塑化剂(SLMF)的引气性能、在水泥颗粒表面的吸附性能、对水泥颗粒表面Zeta电位的影响。结果表明,SLMF对水泥-水体系的分散机理是其含有的-SO_3^-和-COO^-带电产生的静电斥力、在水泥颗粒表面吸附层产生的空间位阻力以及引气产生"滚珠"效应的共同作用;SLMF对水泥-水分散体系的稳定机理是其较强的ξ电位保持能力、对水泥水化的延缓作用和引气对水泥颗粒产生的托浮效应的共同作用。

Air entraining property, the adsorption property and effect to the Zeta potential of /ignosulfonate modified sulfonated melamine formaldehyde resin （SLMF） on the surface of cement particles in water were studied. The results show that the combined action of the electrostatic repulsion force derives from the charged -SO; and -COO-, the space steric hindrance force derives from the adsorbed superplasticizer layer, and the air entraining action （so-called ＂ball bearing action＂） of SLMF results in the dispersion of cement particles in water; the combined action of the strong retention ability of electrostatic repulsion force, set retarding action and bubble floating action of SLMF result in the stabilization of cement-water dispersion system.