α,ω-乙烯基封端甲基苯基聚硅氧烷的制备

Preparation of α,ω-vinyl Terminated Methylphenyl Polysiloxane

以甲基苯基二甲氧基硅烷为原料,采用水解-聚合法制备了不同摩尔质量的α,ω-二乙烯基甲基苯基硅油;并进行了动力黏度、乙烯基含量、折射率、挥发分等性能表征。结果表明,以甲基苯基二甲氧基硅烷为原料,生产成本低,反应单一,该产品杂质含量低,后处理简单。同时,从甲基苯基水解物出发,可以制备多种官能团封端的苯基硅油,大大提高了水解物的利用率并可得到实用性及性能齐全的产品。产品折射率均在1.51以上,最高可达1.55。该乙烯基封端甲基苯基硅油的透光率也完全符合作为LED封装材料的要求。样品在固化后折射率高、透光性好,有较强的耐溶剂、耐水性及耐辐射性,具有耐高温性好、不增粘等优点。所制成的产品具有耐老化性强、抗紫外线性佳及长期使用无变黄等优异性能。

Different molar mass of α,ω-vinyl terminated methylphenyl silicone fluids were prepared by hydrolysis-polymerization with methyl phenyl dimethoxy silane as raw materials, and then their properties, such as dynamic viscosity, vinyl content, refractive index, and volatile contents were characterized.Results＆amp;nbsp;show that when methylphenyldimethoxysilane is used as raw materials, the production cost is low and the prod-uct has low impurities.The reaction can be carried ot as a single reaction and the post-processing is simple. Meanwhile, starting from methylphenyl hydrolysate, a variety of functional-ended phenyl silicone fluid can be prepared, greatly improving the utilization of the hydrolysate.The product has a high refractive index within the range of 1.51 to 1.55.The light transmittance of vinyl terminated methylphenyl polysiloxane meets the re-quirement of LED packaging material.The cured samples have high refractive index and good light transmis-sion, a strong solvent resistance and radiation resistance, water resistance and high temperature resistance, without increasing the viscosity.The prepared products have strong aging resistance, UV resistance and won’ t turn yellow after use for a long time.