Effect of Surfactants on the Viscosity and Stability of Hybrid Silica Sol

Viscosity and stability properties of self-made acidic silica sol with different kinds of surfactants(anionic surfactant,SDBS,SDS,SLS;non-ionic surfactant,OP-10,Twain-80;cationic surfactant,CTAB)were investigated.The results showed that anionic and non-ionic surfactants could reduce the viscosity of the silica sol and improve its stability,however,the cationic surfactant could reduce the stability of the silica sol.Because of its different action mechanism,the effect of surfactant with different dosage on the viscosity and stability was inconsistent. The optimal concentration of surfactants was as follows:SDBS 0.8-1.0g/L,SDS 1.0-1.5g/L,SLS 1.2-1.5g/ L,OP-10 1.5-2.0g/L,Twain-80 1.9-2.0g/L.The optimum dosages of surfactants could be selected according to products′performance requirements in the actual application.