触变性酮肟型单组分有机硅密封胶的研制

Study on One part Thixotropic Ketoxime Type Silicone Sealant

研究了触变性酮肟型有机硅密封胶的交联体系和填料体系的组成及其对密封胶表干时间、电绝缘性能、力学性能和触变性能的影响，得出结论：交联体系中锡催化剂的适宜用量为０ ．４ ～０ ．５ 份（１００ 份α，ω－ 端羟基聚二甲基硅氧烷中的加入量） ，气相 Ｓｉ Ｏ２ 和活性 Ｃａ Ｃ Ｏ３ 作填料可提高密封胶的强度。

This paper is concerned with the composition of crosslinking system & filler system of thixotropic ketoxime type silicone sealant,& their effects on the sealant surface drying time, electrical insulating properties, mechanical properties as well as thixotropic property. Results indicated that the proper amount of tin catalyst is 0.4～0.5 parts per 100 parts polysiloxane. Combinatory application of fumed SiO 2 and activated CaCO 3 not only helps to reinforce the silicone sealant, but also provide excellent thixotropic property for the sealant.