Study on the Preparation of MT Phenyl Silicone Resin.

There are three steps to synthesize the MT vinylphenyl curable silicone resin. Step 1; MT vinylphenyl liquid silicone resin has been synthesized by trimethoxyphenyl silane (as the base material), divinyl - 1,1,3,3 - tetramethydisiloxane and hexamethyldisiloxane (as the end-capping agent) by co-hydrolysis condensation under acidic at first, and then the excess hydroxyl groups are eliminated under alkaline. Step 2: MT hydrophenyl curable silicone resin then has been prepared with trimethoxyphenyl silane (as the base material), 1,1,3,3 - tetramethyldisiloxane and hexamethyldisiloxane (as the end-capping agent) by hydrolysis condensation under acidic firstly, and then replaced by the active hydrogen groups under acidic. Step 3 : Both undergo the cross-linking reaction under the catalyst of platinum to obtain the MT phenyl curable silicone resin, with refractive index greater than 1.5, light transmittance greater than 90% and good thermal stability. It has Shore hardness from 60 A to 90 A, the tensile strength from 5. 15 MPa to 11. 35 MPa, which are good in the field of LED packaging for application. [ABSTRACT FROM AUTHOR]