Vinyl-terminated methyl phenyl silicone oil refers to a silicone oil with a vinyl end group and a methyl group and a phenyl group attached to the silicon atom on the main chain. According to the type of phenyl group, it can be divided into methyl phenyl chain link type, diphenyl chain link type and mixed type (contains two phenyl chain links at the same time). Phenyl hydrogen-containing silicone oil is divided into hydrogen-terminated phenyl silicone oil and side hydrogen-containing phenyl silicone oil, both of which have different uses. The former is mainly used as a diluent or chain extender when added to the encapsulant, and the latter is mainly used as a concentrated cross-linking agent for the encapsulant, acting as a cross-linking center. The preparation method of phenyl hydrogen-containing silicone oil adopts cationic polymerization method, and generally adopts sulfuric acid. In order to reduce the process flow, acidic resin can also be used for catalytic polymerization, eliminating the need for the step of neutralizing the catalyst, and directly filtering out the acidic resin, and the acidic resin can be reused many times.
Vinyl-terminated methyl phenyl silicone oil and phenyl hydrogen-containing silicone oil are the basic raw materials for high refractive index LED encapsulants. With the rapid development of the LED industry, the LED encapsulation industry has unlimited potential, and there is a huge demand for phenyl silicone oil. In recent years, with the further improvement of domestic production technology of phenyl monomers and intermediates, certain progress has been made in the research of such products, 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 organic silicon companies. Phenyl materials are the key to development and are the focus of urgent research.