At present, there are many patents on LED packaging materials, and the research on phenyl packaging materials is the most. Zhang Wei et al. used tetraphenylcyclotetrasiloxane and vinyl double-capped head as raw materials, polymerized at 80-100°C for 6-8 hours in the presence of an alkali catalyst, and synthesized vinylphenyl silicone oil; Silane and hydrogen-containing double head are used as raw materials, reacted at 70-80°C for 3 h in the presence of hydrochloric acid, then washed and distilled to obtain hydrogen-containing phenyl resin, and vinyl phenyl silicone oil and hydrogen-containing resin are cured for LED packaging materials , with high refractive index (>1.54), high light transmittance, good heat resistance and thermal shock stability. Yang Huan, Yang Gang, and Gao Qun obtained phenyl silicone resin by hydrolysis and condensation: phenyltrimethoxysilane, diphenyldimethoxysilane, and vinyltrimethoxysilane were used as raw materials, hydrochloric acid aqueous solution was used as a catalyst, and the temperature was raised. The hydrolysis and condensation reaction was carried out for 6 hours, and finally distilled under reduced pressure at 120°C for 3 hours to obtain a transparent silicone resin at room temperature, after which a certain amount of hydrogen-containing silicone oil and a Pt catalyst were added for hydrosilylation curing reaction.

Ding Xiaowei et al obtained a phenyl-containing hydrogen-based silicone resin by first hydrolyzing alkoxysilane to form a prepolymer, and then polycondensing it with hydrogen-containing alkoxysilane. The process is simple, controllable and environmentally friendly, and the refractive index of its products can reach up to 1.531. The inorganic ultrafine particle composite organic silicon LED encapsulation material prepared by introducing the modification of inorganic oxide particles with high refractive index has the advantages of high refractive index and strong resistance to ultraviolet radiation. Zhang Wenfei et al. used N-(trimethoxysilylpropyl)-4-azido-2,3,5,6-tetrafluorobenzamide to modify nano-zinc oxide, and grafted it on the organosilicon polymer chain. , the grafting reaction changes the refractive index of the nanocomposite, and makes the ZnO nanoparticles more closely match the refractive index of the organic silicon matrix, improving the refractive index of the organic silicon polymer, which has great prospects for application in LED packaging materials. Zhan Xibing et al. used non-hydrolytic sol-gel to prepare a series of transparent titanium hybrid silicone resins. The refractive index of the resin is as high as 1.62, and the obtained products have good light transmission and thermal stability. Our company uses phenyltrimethoxysilane, methylphenyldiethoxysilane and methylvinyldimethoxysilane as raw materials and organic acid as catalyst to synthesize vinylphenyl silicone resin. Phenyl silicone resin and hydrogen-containing silicone resin are cured, the Shore D hardness is 55-75 D, the refractive index is >1.53, and the light transmittance is greater than 99%. It is better used as an LED packaging material.

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