A kind of cross-linking agent used in LED packaging glue and preparation method thereof

Abstract

The invention discloses a crosslinking agent used in LED encapsulation glue and a preparation method. The crosslinking agent used in the LED encapsulant is calculated in parts by weight from 1 to 5 parts of hydroxyfluorosilicone oil, 100 to 105 parts of phenyltrimethoxysilane, 100 to 120 parts of diphenyldimethoxysilane, 10 to It is composed of 20 parts of hydrogen-containing ring body, 40-60 parts of hydrogen-containing double-head, 30-50 parts of distilled water, 100-200 parts of solvent and 3-5 parts of catalyst. The preparation method is to add each raw material into the container, raise the temperature to 65°C under the protection of nitrogen, keep it warm for 3 hours under stirring, then raise the temperature to 100°C, keep it under stirring for 5 hours, wash the obtained reaction solution with distilled water until neutral, and finally control the temperature At 200°C, under a pressure of -0.096MPa, distill under reduced pressure for 0.5-2.0 hours to obtain the cross-linking agent used in the LED encapsulation adhesive. The crosslinking agent has the characteristics of high light transmittance, high refractive index, moderate viscosity and stability.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a crosslinking agent used in LED encapsulation glue and a preparation method thereof. Background technique [0002] At present, LED encapsulants are mainly composed of vinyl silicone resin and hydrogen-containing silicone oil. Among them, hydrogen-containing silicone oil is used as a crosslinking agent for LED encapsulation glue. [0003] The refractive index of hydrogen-containing silicone oils on the market is generally low, lower than 1.53; and the existing hydrogen-containing silicone oils are all made by hydrolysis and polycondensation of hydrochlorosilanes and non-hydrogen-containing chlorosilanes, and the reaction controllability is poor. The composition of hydrogen-containing silicone oil obtained under different raw material ratios and hydrolysis conditions is very different, resulting in poor product stability, poor light transmission and increase...

AI Technical Summary

Problems solved by technology

[0003] The refractive index of hydrogen-containing silicone oils on the market is generally low, lower than 1.53; and the existing hydrogen-containing silicone oils are all made by hydrolysis and polycondensation of hydrochlorosilanes and non-hydrogen-containing chlorosilanes, and the reaction controllability is poor

The composition of hydrogen-containing silicone oil obtained under different raw material ratios and hydrolysis conditions is very different, resulting in poor product stability, poor light transmission and increased viscosity of the product after a period of storage; moreover, the reaction repeatability is poor, even in the same raw material formulation. Under the same reaction conditions, the resulting products may still be different

Moreover, the viscosity of the hydrogen-containing silicone oil in the storage period fluctuates in a wide range, which is difficult to meet the development needs of the high-power LED packaging industry.

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