采用高黏度的α,ω二羟基聚二甲基苯基硅氧烷与交联剂为主要原料,通过引入催干性效果好的催化剂及吸油量大的气相二氧化硅制备适合不同基材使用的速干型密封胶。通过热重分析(TG)、表干时间、硬度、拉伸测试等探讨了交联剂、催化剂、白炭黑的种类和用量对密封胶固化效果和机械性能的影响。研究表明:乙烯基三丁酮肟基硅烷作为交联剂与催化剂二月桂酸二丁基锡复配能够大幅度提升密封胶固化速度,气相二氧化硅1对密封胶的补强效果最好,随着用量的增加,涂膜硬度、拉伸强度逐渐增大,断裂伸长率能够达到367.06%。速干型室温固化密封胶密封胶能够快速修补缝隙,整体剥离,具有广阔的应用前景。

Using high viscosityα,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.