Using high viscosity α,ω-dihydroxyl polydimethyl phenyl siloxane and crosslinking agent as the main raw materials,through the introduction of a catalyst with good drying effect and a large oil absorption of fumed silica to prepare a quick drying type sealant suitable for different substrates.The effects of the type and amount of crosslinking agent,catalyst and silica on the curing effect and mechanical properties of sealant were investigated by TG,surface drying time,hardness and tensile test.The results show that the curing speed of sealant can be greatly improved by the combination of methyl-trituloxime silane as crosslinking agent and dibutyltin dilauroate as catalyst.Fumed silica 1 has the best reinforcing effect on sealant.With the increase of the dosage,the hardness and tensile strength of the film gradually increase,and the elongation at break can reach 367.06％.Quick-drying type room temperature curing sealant sealant can quickly repair the gap,the whole peel off,has a broad application prospect.
关键词
密封胶/断裂伸长率/整体剥离/结构件
Key words
sealant/elongation at break/integral stripping/structural parts
维普
万方数据