Phenyl silicone oil A light-emitting diode (LED) is an electroluminescent solid device. With the continuous innovation of technology and the guidance of national policies, the entire LED product has developed rapidly, and the LED packaging industry has developed simultaneously. Among packaging materials, silicone packaging materials have been recognized by the industry for their excellent performance and have become the fastest growing and most valuable packaging materials, showing huge market value.
LED silicone encapsulant is a new type of high-performance liquid silicone, also known as optical encapsulation. It maintains a high transmittance in the visible light region and has a high absorption rate of ultraviolet light, which improves the light output rate and service life of lighting equipment.

In recent years, due to the rapid development of the LED industry, the demand for LED packaging materials has continued to increase. LED silicone packaging adhesive has become a leader in the field of LED packaging materials with its excellent physical and chemical properties. As the energy crisis intensifies, the LED industry will maintain continued growth. Therefore, the market potential of LED packaging materials is huge. High-power LED packaging materials have high requirements on the light transmittance and refractive index of raw materials. Phenyl silicone oil has become an important component of LED packaging adhesives. As the phenyl mole fraction increases, the high temperature resistance, radiation resistance and refractive index of silicone materials are improved, and phenyl silicone oil is becoming more and more important in LED packaging adhesives.

Phenyl silicone oil for LED packaging mainly includes terminal vinyl methyl silicone oil and phenyl hydrogen silicone oil. Phenyl silicone oil can be divided into low phenyl silicone oil (phenyl mole fraction 5%-10%), medium phenyl silicone oil (phenyl mole fraction 25%) and high phenyl silicone oil (phenyl mole fraction 45%) according to benzene content. . Different uses of LED packaging glue have different requirements for phenyl content. High-power LED packaging glue generally requires a higher phenyl content to achieve a high refractive index, thereby reducing light source energy loss.
Terminal vinyl methyl phenyl silicone oil refers to the main chain of terminal silicon atoms containing vinyl groups connected to methyl silicone oil and phenyl silicone oil. According to the type of phenyl group, it can be divided into methylphenyl chain node type, diphenyl chain node type and mixed type (containing two phenyl chains at the same time).
part). Phenyl hydrogen-containing silicone oil is divided into terminal hydrogen-containing 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 for packaging glue, while the latter is mainly used as a concentrated cross-linking agent for packaging glue, playing the role of a cross-linking center. A method for preparing phenyl-containing hydrogen-containing silicone oil is cationic polymerization, generally using sulfuric acid. In order to reduce the process flow, acid resin can also be used to catalyze polymerization, eliminating the step of neutralizing the catalyst and filtering the acid resin directly. The acid resin can be reused many times.
Vinyl-terminated methylphenyl silicone oil and phenyl-containing hydrogen silicone oil are the basic raw materials for making high-refractive index LED packaging glue. With the rapid development of the LED industry, the LED packaging industry has unlimited potential, and the demand for phenyl silicone oil is also huge.

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