Preparation of Low Temperature Resistance of Silicone Gels
A silicone gel with low-viscosity,high-transparency and low-temperature resistance was prepared by self-made phenylvinyl silicone oil,phenyl side hydrogen silicone oil and methyl hydrogen silicone oil as the materials.The effects of phenyl,vinyl,ratio of terminal SiH groups to side SiH groups on properties of the gel were studied,and the relationship between catalyst with curing temperature and time of silicone gel and its influence on yellowing properties were discussed.It was found that when 8%phenyl vinyl silicone oil was selected,the transparency and low temperature resistance of the silicone gel could meet the requirements.The lower the vinyl content,the higher the hydrogen content ratio of the end SiH to the side SiH,and the lower the cone penetration of the corresponding phenyl silicone gel.When the mass fraction of catalyst is 0.01wt%-0.02wt%,the gel does not turn yellow at 80℃for 72 h.Therefore,the series of phenyl silicone gel has been prepared with different cone penetration,low temperature resistance and yellowing resistance,which are expected to be applied in LED encapsulation.
low temperature resistancephenyl silicone gelphenyl vinyl silicone oilyellowing resistance
NETL
NSTL
万方数据
