α，ω－乙烯基封端甲基苯基聚硅氧烷的制备

摘要

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 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.