建筑外墙填缝改性硅酮密封胶应用研究

Study on application of modified silicone sealant for joint filling of building exterior wall

以硅氧烷改性聚醚S810(MS预聚体)为主要原料,结合填料、增塑剂、触变剂、气相二氧化硅、光稳定剂与抗氧剂等原料制备主剂;将增塑剂、催化剂与月桂氨混合制备成固化剂,按照m(主剂)∶m(固化剂)=10∶1的比例混合,添加适量色浆,制成改性硅酮密封胶,对改性硅酮密封胶的应用性能进行测试。结果表明,以国产D680作为触变剂,MS预聚体用量为30%、填料用量为29%的条件下,制备的改性硅酮密封胶消黏性能与触变性能均较好、挤出性较高,模量相对较低,并具备高位移能力,符合实际建筑外墙填缝应用需求。

Silicone modified polyether S810(MS prepolymer)was used as the main raw material,and the main agent was prepared by combining filler,plasticizer,thixotropic agent,fumed silica,light stabilizer and antioxidant.The curing agent was prepared by mixing plasticizer,catalyst and lauryl ammonia.The main agent and curing agent were mixed according to the ratio of 10∶1,and proper amount of color paste was added to prepare modified silicone sealant.The application performance of modified silicone sealant was tested according to relevant standards.The test results showed that when D680 was used as thixotropic agent,MS prepolymer dosage was 30%and filler content was 29%,the prepared modified silicone sealant had good detackifying and thixotropic properties,high extruding performance,relatively low modulus,and high displacement capacity,which met the requirements of actual building exterior wall caulking applications.