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透明液体硅胶可用于涂敷、浸渍及灌注

网址:  2019-08-13  作者:admin    阅读:

透明液体硅胶可用于涂敷、浸渍及灌注。例如粘度为0.07~50帕·秒/25℃的羟基封端聚二甲基硅氧烷,用甲基乙烯基双吡咯烷酮硅烷为链增长剂,用有机过氧化物,如过氧化二苯甲酰、25—二甲基地5—二叔丁基过氧己烷为硫化剂,此种胶料流动性好、粘度低,在其硫化过程中同时发生链子增长反应,故可获得高分子量的弹性体,具有良好的物理机械性能。
Transparent liquid silica gel can be used for coating, impregnation and perfusion. For example, hydroxyl-terminated polydimethylsiloxane with viscosity of 0.07-50 Pa.s/25 C, methyl vinyl bispyrrolidone silane as chain growth agent and organic peroxides such as dibenzoyl peroxide and 25-dimethyl 5-di-tert-butyl peroxyhexane as vulcanizing agent have good fluidity and low viscosity and have been vulcanized. The chain growth reaction occurs at the same time in the process, so high molecular weight elastomer can be obtained, which has good physical and mechanical properties.
链增长剂甲基乙烯基双吡咯烷酮硅烷,可由吡咯烷酮与甲基乙烯基二氯硅烷在三乙胺存在下反应而得,产物容易水解,故需存放在干燥密闭的容器中,这种化合物的吡咯烷酮基在室温下可与聚二甲基硅氧烷内的端羟基缓慢反应,其反应速度随温度升高而加快。
The chain growth agent, methyl vinyl bispyrrolidone silane, can be obtained by the reaction of pyrrolidone with methyl vinyl dichlorosilane in the presence of triethylamine. The product is easy to hydrolyze, so it needs to be stored in a dry and airtight container. The pyrrolidone group of this compound can react slowly with hydroxyl end group in polydimethylsiloxane at room temperature. The reaction rate increases with the increase of temperature.

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