Silicone resin in LED packaging materials

At present, there are many patents on LED packaging materials, and phenyl encapsulating materials are the most studied. Zhang Wei et al. used tetraphenylcyclotetrasiloxane and vinyl double head as raw materials, and polymerized at 80-100 ° C for 6-8 hours in the presence of a base catalyst to synthesize vinyl phenyl 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, and then washed with water to obtain hydrogen-containing phenyl resin. Vinyl phenyl silicone oil and hydrogen-containing resin are cured for LED packaging materials. It has high refractive index (>1.54), high light transmittance, good heat resistance and thermal shock stability. Yang Huan, Yang Gang, Gao Qun use hydrolytic condensation to obtain phenyl silicone resin: phenyltrimethoxysilane, diphenyldimethoxysilane, vinyltrimethoxysilane as raw material, aqueous hydrochloric acid as catalyst, temperature rise The hydrolysis condensation reaction was carried out for 6 hours, and finally distilled under reduced pressure at 120 ° C for 3 hours. After obtaining a transparent silicone resin at room temperature, a certain amount of hydrogen-containing silicone oil and a Pt catalyst were added to carry out a hydrosilylation curing reaction. Ding Xiaowei et al. obtained a phenyl-containing hydrogen-based silicone resin by first hydrolyzing an alkoxysilane into a prepolymer and then polycondensing it with a hydrogen-containing alkoxysilane. The process is simple, controllable and environmentally friendly, with a refractive index of up to 1.531. The inorganic ultrafine particle composite type silicone LED encapsulant prepared by introducing the modification of the inorganic oxide fine particles having a high refractive index has the advantages of high refractive index and strong anti-ultraviolet radiation. Zhang Wenfei et al. modified nano zinc oxide with N-(trimethoxysilylpropyl)-4-azido-2,3,5,6-tetrafluorobenzamide and grafted it onto the silicone polymer chain. The grafting reaction changes the refractive index of the nanocomposite and makes the refractive index of the ZnO nanoparticle and the silicone matrix more matching, which improves the refractive index of the silicone polymer, and has great prospects for LED packaging materials. Zhan Xibing and others used a non-hydrolyzed sol-gel to prepare a series of transparent titanium hybrid silicone resin. The refractive index of the resin is as high as 1.62, and the obtained product has good light transmittance and thermal stability. We use phenyltrimethoxysilane, methylphenyldiethoxysilane, methylvinyldimethoxysilane as raw materials, organic acid as catalyst, synthetic vinyl phenyl silicone resin, vinyl obtained. The phenyl silicone resin and the hydrogen-containing silicone resin are cured, the Shore D hardness is 55-75 D, the refractive index is > 1. 53. The light transmittance is more than 99%, and is preferably used for the LED packaging material.

Room termperature curing polysilazane, pls check IOTA 9150, IOTA 9150A. 
High termperature curing polysilazane, pls check IOTA 9108, IOTA 9118.