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 of α,ω-Dihydroxy Polydimethylsiloxane on Properties of One-Component Dealcoholized Silicone Sealant
陈文浩 1周兴 1蒋金博 1刘文俊 1李向楠1
作者信息
- 1. 广州白云科技股份有限公司, 广州 510540
- 折叠
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.
Abstract
Four types of α,ω-dihydroxy polydimethylsiloxane with similar viscosities and different molecular weight distribu-tions 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 ex-cellent performance at-30℃,and the tensile strength and maximum strength elongation increases when the molecular weight dis-tribution 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Key words
silicone sealant/dealcoholized/one-component/molecular weight distribution/property引用本文复制引用
出版年
2024
NETL
NSTL
万方数据