Vinyl-terminated methyl phenyl silicone oil refers to the silicone oil whose end group contains vinyl group and the silicon atom on the main chain is connected with methyl group and phenyl group. According to the type of phenyl group, it can be divided into methyl phenyl chain type, diphenyl chain type and mixed type (containing two kinds of phenyl chains at the same time Festival). Phenyl hydrogen-containing silicone oil is divided into hydrogen-terminated phenyl silicone oil and side-hydrogen-containing phenyl silicone oil, which have different uses. The former is added to the encapsulant and is mainly used as a diluent or chain extender, while the latter is mainly used as a concentrated cross-linking agent for the encapsulant, which acts as a cross-linking center. The preparation method of phenyl hydrogen-containing silicone oil adopts cationic polymerization method, generally using sulfuric acid. In order to reduce the technological process, the acid resin can also be used for catalytic polymerization, the step of neutralizing the catalyst is omitted, the acid resin is directly filtered, and the acid resin can be reused many times.

Vinyl-terminated methyl phenyl silicone oil and phenyl hydrogen-containing silicone oil are the basic raw materials of high-refractive index LED encapsulant. With the rapid development of the LED industry, the LED packaging industry has unlimited potential, and the demand for phenyl silicone oil is huge. In recent years, with the further improvement of domestic production technology of phenyl monomers and intermediates, the research on such products has made certain progress, but there is still a certain gap compared with foreign products, which needs to be improved urgently. At present, high refractive index LED packaging The glue preparation technology and market are monopolized by foreign silicone companies. Phenyl materials are the key to development and the focus of urgent research.