Research on the influence of fillers and plasticizers on the performance of polysulfide road potting sealant
A comparison was made by using lightweight CaCO3,heavy CaCO3,kaolin,and nano ZnO as fillers for polysulfide road potting sealant.Fumed SiO2 was added as the reinforcing filler to the sealant,and two kinds of plasticizers,dibutyl phthalate(DBP)and butyl benzyl phthalate(BBP)were selected for comparison.The influence of different types and dosages of fillers and plasticizers on the performance of polysulfide road potting sealant was studied,at the same time,the optimal dosage of filler and plasticizer for polysulfide potting sealant was determined.The research results showed that the polysulfide potting sealant prepared with lightweight CaCO3 as filler had better mechanical properties and could be better dispersed in the system.Compared to DBP,BBP was more environmentally friendly and less prone to contaminating the substrate.Therefore,lightweight CaCO3 and BBP were selected as filler and plasticizer,respectively.After studying their mechanical properties,microstructure,dispersion,and thermal stability,it was believed that the comprehensive performance of the prepared polysulfide potting sealant was relatively good when the optimal dosage of lightweight CaCO3 was 200 parts and the optimal dosage of BBP was 80 parts.
NETL
NSTL
万方数据
