At present, there are a lot of patents on LED packaging materials, and phenyl packaging materials are the most studied.
Zhang Wei et al. synthesized vinylphenyl silicone oil by polymerization of tetraphenyl cyclotetrasiloxane and vinyl double head at 80 ~ 100℃ for 6 ~ 8h in the presence of alkali catalyst.
Silane with phenyl 3 armour oxygen radicals and hydrogen dual head as raw materials, in the presence of hydrochloric acid reaction 3 h, 70 ~ 80 ℃ and then washed distillation system containing hydrogen phenyl resin, vinyl phenyl silicone oil containing hydrogen resin curing for the LED packaging material, high refractive index (> 1.54), high light transmittance, good heat resistance and thermal shock stability.
Phenyl organosilicone resin was obtained by hydrolysis condensation by Yang Huan, Yang Gang, Gao Qun:
Choose silane phenyl 3 armour oxygen radicals, diphenyl dimethoxy silane, vinyl silane as raw materials, three oxygen radicals hydrochloric acid aqueous solution as the catalyst, temperature on hydrolysis condensation reaction of 6 h, then vacuum distillation 3 h under 120 ℃, be transparent silicone resin at room temperature after add a certain amount of hydrogen containing silicone oil and silicon hydrogen addition curing reactions Pt catalyst.
Ding Xiaowei et al. obtained a hydrogen-based silicone resin containing phenyl group by hydrolyzing alkoxy silane to make a prepolymer and then condensing it with hydroalkoxy silane.
The process is simple, controllable and environmentally friendly, and the highest refractive index of the product can reach 1.531.
The inorganic ultramicron composite organosilicon LED packaging material was prepared by the modification of inorganic oxide particles with high refractive index, which has the advantages of high refractive index and strong UV radiation resistance.
Wen-fei zhang, N - (preparation silicon propyl) - 4 - azide - 2,3,5,6 - four fluorine benzamide modified nano zinc oxide, and the grafted on organic silicon polymer chains, grafting reaction changed nanometer complex refractive index, and makes the ZnO nanoparticles with organic silicon substrate refractive index is more match, enhances the refractive index of organic silicon polymer,
It has great prospect in LED packaging materials.
Zhan Xibing et al. used non-hydrolyzed sol-gel to prepare a series of transparent titanium hybrid silicone resins. The refractive index of the resin was as high as 1.62, and the products obtained at the same time had good light transmittance and thermal stability.