High-performance organic silicon resin-polymethyl methacrylate composite material mixed with nanometer silicon nitride for LED package, and preparation method of high-performance organic silicon resin-polymethyl methacrylate composite material

The invention discloses a high-performance organic silicon resin-polymethyl methacrylate composite material mixed with nanometer silicon nitride for LED package. The composite material is a high-performance material which is formed by polymerization and curing of vinylphenyl silicone oil, hydrogen containing silicon resin, vinyl silicone resin and methyl methacrylate and has the hybrid advantages of organic silicon resin and polymethyl methacrylate; besides, powder formed by compounding nanometer silicon nitride which is mixed in the composite material, surface-treated with a silane coupling agent and wrapped by silica sol, magnesium sulfate whiskers and grapheme is good in compatibility with resin, and high in surface activity, after the powder is uniformly dispersed in the resin, the refractive index, the heat-conducting property, the heat dissipation performance, the high-temperature oxidation resistance, the insulation performance and other performance of the composite material can be improved greatly, and the prepared material is high in mechanical property, long in service life, high in transparency, and excellent in optical performance.