新型硅酮密封胶增塑剂的合成及性能

以有机硅高沸物、正辛醇为原料,合成了一种硅酮密封胶增塑剂烷氧基硅烷。以产物中有机氯的质量分数为指标,考察了反应温度、反应时间、物料摩尔比对合成反应的影响,确定了较佳的合成工艺:n(氯硅烷)∶n(正辛醇)=1∶6,反应温度110℃,反应时间21 h,在该条件下产品中有机氯的质量分数可低至3.02%。在硅酮密封胶中添加质量分数为10%的增塑剂后,密封胶的性能有明显改善,可以有效解决建筑用硅酮密封胶的渗油污染问题。

Synthesis and Properties of New Type Plasticizer Used for Silicone Sealant

In this paper,a new type of plasticizer,alkoxy silane,is synthesized from the raw materials of high-boiling residue of organosilicon and octanol.The effect of reaction temperature,reaction time and molar ratio on the synthesis was studied,and the optimum technological conditions were ascertained as follows:the mole ratio of chlorosilane to octanol is 1∶6,reaction time is 21 h,and reaction temperature is 110 ℃.Under these optimum conditions,the content of organic chlorides can be as low as 3.02%.Experimental results indicate that when the content is 10%,this plasticizer could greatly improve the performance of the silicone sealant.In addition,the application of this plasticizer could solve the problem of oil leaking pollution with the silicone sealant used for building.