Preparation and Performance Study of High Refractive Index Silicone Resin for LED Encapsulation
Hydrogen phenyl silicone resin(HPS)and vinyl phenyl silicone resin(VPS)were prepared through hydrolytic polycondensation method,using diphenyl-dimethoxy-siloxane(DMDPS),methyl-phenyl-dimethoxy-silane(MPDMS),1,3,5,7-tetramethylcyclote-trasiloxane(D4H),tetramethyl-disiloxane(D2H),1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane cyclotetrasiloxane(D4Vi)and divinyl-tetramethyl-disiloxane(D2Vi)as raw materials.The two components were compounded and the packaging material VHPMS was obtained after high-temperature cured.The influence of different compounding ratios on the light transmittance,thermal stability,tensile strength,aging resistance and hydrophobicity of the packaging material was discussed.The results showed that the mass ratio of hydrogen phenyl silicone resin to vinyl phenyl silicone resin was 3∶5.The VHPMS showed excellent overall performance.Its refractive index was 1.543 6,the light transmittance reached 98％,the shore hardness was 84 and the hydrophobic angle was 121°.There was basically no change in performance before and after the red ink penetration experiment and aging resistance test.
LED packagingphenyl silicone resinshydrolysis conde-nsationsilicon hydroxide addition
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维普
