Preparation and performance study of a stearic acid-based hydrophobic agent
AN Xuehui
ZHANG Chao
BAI Hao
YAO Guoyou
Abstract：A stearic acid based hydrophobic agent was prepared to improve the overall hydrophobicity of cement mortar,in re-sponse to the problem that hydrophobic powders are often difficult to uniformly disperse in cement mortar.Firstly,by improving the process,adding 4%compound emulsifier with mass ratio[m(Span60)∶m(MOA-3PK-40)=1∶2]and emulsifying for 2 h,the lotion like stearic acid based hydrophobic agent with solid content of 28%,low viscosity and good dispersion was prepared.The effect of the dosage of stearic acid based hydrophobic agent on the properties of cement mortar was studied.The results showed that the addi-tion of an appropriate amount of stearic acid based hydrophobic agent significantly increased the water contact angle on the inner and outer surfaces of the modified mortar.When the dosage was 4%,the water contact angle on the outer surface was 134°,and the 48 hour water absorption ratio decreased to 25.9%.The overall hydrophobic effect of the mortar was good,and the resistance to chloride ion penetration was significantly improved.Based on the microstructure of the mortar section,it can be concluded that when the dosage of stearic acid based hydrophobic agent is too high,the internal pores of the mortar increase and the strength de-creases.
Keywords：stearic acid-based hydrophobic agentemulsionhydrophobicbulk modification
Publication Date：2025-08-25
Online Publishing Date：2025-09-12(First online date of this platform, not the publication date of the document)
Pages：5( 101-105 )