Vinylphenylpolysiloxane, preparation method and application

Abstract

The invention discloses a preparation method of vinylphenylpolysiloxane. The method comprises the following steps: 1) stirring a solvent, diphenyl silanediol, an alkyloxy compound and a catalyst and heating the mixture in a reaction vessel to react for 1-40h, and adding an end plate agent for blocking; 2) heating the above mixed liquor and stirring; 3) standing and filtering; and 4) heating a filtrate, removing low-boiling-point substances so as to obtain vinylphenylpolysiloxane. The invention also discloses vinylphenylpolysiloxane prepared by the above method and an application of vinylphenylpolysiloxane in LED package resin. The preparation method of vinylphenylpolysiloxane has the following advantages: firstly, resin storage stability is raised; secondly, it is convenient for industrialization; and finally, generation of industrial wastewater is avoided, and the preparation method is more environmentally friendly. Refractive index of the vinylphenylpolysiloxane disclosed by the invention is 1.50-1.57, and the vinylphenylpolysiloxane is especially applicable to be used as a strengthening agent of macromolecules in an LED packaging material.

Description

technical field [0001] The invention relates to the field of encapsulation material design, in particular to a vinylphenyl polysiloxane used in LED encapsulation resin, its preparation method and application. Background technique [0002] Silicone is an important LED packaging material, which has the advantages of good temperature resistance, high light transmittance, large refractive index, good stability, small stress, low hygroscopicity, good mechanical properties and ultraviolet radiation resistance, etc. The performance is far superior to epoxy resin, which is also an LED packaging material, so it has become the first choice for power LED packaging. Silicone encapsulation material with high refractive index is made of vinyl silicone resin containing a certain amount of diphenylsiloxane chain or methylphenylsiloxane chain and hydrogen-containing silicone oil through hydrosilicon addition reaction under certain conditions. Got it. [0003] Many researchers use diphenyl ...

AI Technical Summary

Problems solved by technology

However, due to the large difference in the hydrolysis activity of the above components, the synthesized polymer is not uniform, which seriously affects the mechanical properties and light transmittance of the cured film, and finally leads to the product being exposed to severe temperature changes and ultraviolet radiation. Cracking and yellowing occur, and the above methods will generate a large amount of waste water, seriously polluting the environment

[0004] The research team of Byeong-Soo Bae from Korea Advanced Institute of Science and Technology recently published a number of papers on organosilicon hybrid materials in high-level SCI journals Research papers were published on Chemistry of materials in 2010 entitled Thermally Stable Transparent Sol-Gel Based Siloxane Hybrid Material with High Refractive Index for Light Emitting Diode (LED) Encapsulation, and in 2012 on Journal of Materials Chemistry For the research paper on High performance encapsulant for light-emitting diodes (LEDs) by a sol-gel derived hydrogen siloxane hybrid, Byeong-Soo Bae's research team used diphenylsiloxane as one of the raw materials and Ba(OH )2 was used as a catalyst to synthesize a series of silicone resins. The silicone resin synthesized by this method will cause a small amount of Ba(OH)2 to be stored in the system. The stability is very poor, and the synthetic resin has a great influence on the curing rate after compounding. In the literature, it is required to add 200ppm of platinum catalyst to increase the curing temperature to 150oC, so it is often It brings the problems of low refractive index and low hardness of the resin and low thermal shock resistance