107胶分子量分布对单组分脱醇型有机硅密封胶性能的影响  

Effect of Molecular Weight Distribution ofα,ω-Dihydroxy Polydimethylsiloxane on Properties of One-Component Dealcoholized Silicone Sealant

作　　者：陈文浩 周兴 蒋金博 刘文俊 李向楠 CHEN Wenhao;ZHOU Xing;JIANG Jinbo;LIU Wenjun;LI Xiangnan(Guangzhou Baiyun Technology Co.,Ltd.,Guangzhou 510540,China)

机构地区：[1]广州白云科技股份有限公司,广州510540

出　　处：《有机硅材料》2024年第2期49-53,共5页Silicone Material

摘　　要：本文选取了市面上四种相近黏度、不同分子量分布的α,ω-二羟基聚二甲基硅氧烷为基础聚合物,制备了单组分脱醇型有机硅密封胶。结果表明,随着聚硅氧烷分子量分布的变宽,有机硅密封胶的表干时间差别不大,但邵氏硬度随之增大,而拉伸强度、剪切强度以及最大强度伸长率都呈现出下降的趋势。当分子量分布指数为1.97时,有机硅密封胶在-30℃下展现出了更加优异的性能表现,其拉伸强度和最大强度伸长率均有所升高。Four types ofα,ω-dihydroxy polydimethylsiloxane with similar viscosities and different molecular weight distributions were used as base polymer to prepare one-component dealcoholized silicone sealant.The results show that as the molecular weight distribution of polysiloxane widens,there is no difference in the surface drying time of the sealant,but the Shore hardness increases,while the tensile strength,shear strength,and maximum strength elongation decrease.The silicone sealant shows excellent performance at-30℃,and the tensile strength and maximum strength elongation increases when the molecular weight distribution index is 1.97.

关 键 词：有机硅密封胶 脱醇型 单组分 分子量分布 性能 

分 类 号：TQ433.438[化学工程]