Studies On The Preparation Of MQ Resin And Its Application In Light Emitting Diode Encapsulation

It is well known that a large amount of energy was consumed in our daily lives. It is very beneficial to invent some new kinds of illuminating instruments with less energy consumed. LED hsa advantages like low energy consumption, long life, no pollution and so on. Consequently, it is very helpful in energy-saving and environment-protecting. The packaging materials are very important to the LED because the device packaging, assembling, reliability and life time are determined by the quality of packaging materials. Therefore, it is critical to manufacture the packaging material, which poses serious challenges to the development of LED. Compared with American and Japanese companies, Chinese enterprises fall behind. Most packaging materials are relied on import, which increased the cost of LED products and restricted the development of LED. So it will be beneficial to both our society and economy, if we make high-quality LED packing material.Vinyl MQ resin and hydrogen-containing MQ resin, which are suitable for LED packaging, are discussed in this paper. The optimum conditions to synthesize MQ silicone resin were explored. This paper can be divided into four parts as follow:(1)The progress and present situation of LED were briefly reviewed. All parts of packaging materials were discussed in detail. The research goal and technical routes for encapsulation were subsequently discussed.(2)Vinyl MQ silicone resin was synthesized via the hydrolytic condensation of tetraethyl orthosilicate(TEOS). The optimal conditions of synthesizing the vinyl MQ resin were as follow: the reaction temperature was at 80 ℃; reaction time was 3 h; the mass ratio of catalyst to the whole reactants was 4.99%; the mass ratio of water was 20.77%; the mass ratio of ethanol was 21.81%.(3) Hydrogen-containing MQ silicone resin was synthesized via the hydrolytic condensation of tetraethyl orthosilicate(TEOS). The optimal conditions of synthesizing the hydrogen-containing MQ resin were as follow: the reaction temperature was at 80℃; reaction time was 3 h; the mass ratio of catalyst to the whole reactants was 4.77%; the mass ratio of water was 20.87%; the mass ratio of ethanol was 14.91%.(4) Two kinds of liquid basic polymer were prepared by using those synthesized vinyl polysiloxane, hydrogen-containing silicone oil, vinyl MQ silicone resin, hydrogen-containing MQ silicone resin. In addition, silicone rubber was cured by liquid basic polymer, and platinum was used as catalyst. The results were showed as follows: the optimum cured temperature was at 90℃ and 150℃ for 1h and 2h. The mass ratio of catalyst to the whole reagent was 15 ppm. The molar ratio of Si-H/Si-Vi was 1.2~2.0. The mass percentage of MQ resin in two kinds of liquid basic polymer was both 30%. The vinyl content in vinyl MQ silicone resin was 1.099mmol/g. The ratio of M/Q in vinyl MQ silicone resin was 0.6~0.9. The ratio of M/Q in hydrogen-containing MQ silicone resin was 0.7. The hydrogen content in hydrogen-containing MQ silicone resin was 0.0843mmol/g. The encapsulation material exhibited optimal results that the tensile strength was 2.13 MPa; hardness was 53 shore A; elongation(%) at break was 231%; ransmittance was more than 90%.