Source: Silicone Innovation Institute, welcome attention


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 grown at the same time. Among the 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, which have shown great market value.


 






 


LED silicone encapsulant is a new type of high-end liquid silicone, also known as optical packaging. It can maintain high transparency in the visible region, has a high absorption rate for ultraviolet light, and can improve the light output rate and use of lighting devices. life.


 


In recent years, due to the rapid development of the LED industry, the demand for LED packaging materials has increased. Among them, LED silicone packaging adhesives have become the leader in LED packaging materials due to their excellent physical and chemical properties. With the increase of the energy crisis, the LED industry will continue to grow, so the market potential of LED packaging materials is huge. High-power LED packaging materials require high light transmittance and refractive index of the raw materials, and phenyl silicone oil has become an important component of LED packaging rubber raw materials. With the increase of the phenyl mole fraction, the high temperature resistance, radiation resistance and refractive index of the silicone material are improved, and the importance of the phenyl silicone oil for the LED encapsulant is increasing.


 


The phenyl silicone oil for LED encapsulation mainly includes two types of vinyl-terminated methylphenyl silicone oil and phenyl hydrogen-containing silicone oil. Phenyl silicone oil can be further divided into: phenyl silicone oil (phenyl mole fraction 5% - 10%); medium phenyl silicone oil (phenyl mole fraction 25%); high phenyl silicone oil (phenyl mole fraction) 45%). LED package adhesives for different purposes have different requirements for phenyl content. High-power LED package adhesives generally require a higher phenyl content in order to achieve a high refractive index, thereby reducing the loss of light source energy.


 










The vinyl terminated methylphenyl silicone oil refers to a silicone oil having a vinyl group at the terminal group and a methyl group and a phenyl group bonded to a silicon atom in the main chain. According to the type of phenyl, it can be divided into methylphenyl chain type, diphenyl chain type and mixed type (including two kinds of phenyl chain).


 


Section). The phenyl hydrogen silicone oil is divided into a hydrogen-terminated phenyl silicone oil and a side hydrogen-containing phenyl silicone oil, and the two uses are different. The former is mainly used as a diluent or a chain extender in the encapsulant, and the latter is mainly used as a concentrated cross-linking agent for the encapsulant, and functions as a cross-linking center. The preparation method of the phenyl hydrogen-containing silicone oil adopts a cationic polymerization method, and sulfuric acid is generally used. In order to reduce the process, catalytic polymerization can also be carried out using an acidic resin, the step of neutralizing the catalyst is omitted, the acidic resin is directly filtered off, and the acidic resin can be reused many times.


 


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