It is understood that the commonly used LED packaging materials are mainly epoxy, polyurethane, silicone and other highly transparent materials. Among them, the surface of the polyurethane encapsulant is too soft, prone to blistering, and has insufficient curing, and can only be applied to potting of general electrical components. The most commonly used epoxy resins are brittle and have poor impact resistance, and the operating temperature generally does not exceed 150°C. Silicone materials have good heat resistance and UV resistance, and at the same time have good compatibility with chips. They are the ideal packaging materials at present, but they are expensive, and they are generally only used in high-power LED packages that require harsh packaging materials. application. With the increase of high-power LED luminous efficiency, its application in the lighting field is gradually expanding, and the amount of high-power LED packaging materials will increase. Jiangxi has the largest organic silicon monomer production base in the country, and Nanchang is also the national semiconductor lighting engineering industrialization demonstration base. The development of organic silicon products for high-power LED packaging will effectively promote the development of the LED industry in Jiangxi Province.
An additive-forming liquid silicone rubber specifically designed for high-power LED packaging was successfully developed by the Polymer Research Institute of Nanchang University. On April 20th, this new material was used to achieve a 1,000-ton industrial mass production in Jiangxi Lutai Technology Co., Ltd. In the situation where domestic LED industry urgently needs supporting packaging materials, this new product is immediately sought after by the market.
The user trial results show that the product's packaging effect is comparable to that of imported products, and its cost-effectiveness is outstanding. Professor Chen Yiwang, dean of the Department of Chemistry and director of the Institute of Polymer Research at Nanchang University, told reporters that no harmful substances were produced during the synthesis of the product, and organic acids were used as catalysts to avoid impurity ion residues. Compared with imported products, the cost is reduced by more than half, which is conducive to a wide range of applications. The project has obtained two patents.
The research results synthesize vinyl-terminated silicone oil as a base polymer by ring-opening polymerization of organosilicon monomers, synthesize MQ silicone resin as a reinforcing filler by organic acid-catalyzed hydrolysis and condensation, and use a low-hydrogen silicone oil as a cross-linking agent. Acetylene cyclohexanol is used as an inhibitor to prepare two-component addition molding liquid silicone rubber. The product has the advantages of moderate viscosity, good mechanical properties, high transparency and good aging resistance. At the same time, due to the use of organic acids as catalysts in the synthesis of reinforcing filler MQ silicone resin, the inorganic ion content in the product is reduced, and the radiation resistance of the silicone rubber product is improved, and the nano-zinc oxide modified by a silane coupling agent is used as heat conduction. The material improves the thermal conductivity and surface hardness of the cured silicone rubber.