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A kind of high folding and anti-yellowing LED encapsulation silica gel

A LED packaging and anti-yellowing technology, which is applied in adhesives, non-polymer adhesive additives, adhesive additives, etc., can solve problems such as high-temperature yellowing, and achieve obvious effects of high-temperature yellowing resistance and obvious effects

Active Publication Date: 2016-05-11
YANTAI DARBOND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The known synthesis is to add acetic acid, and then wash to neutrality. After the raw material is made into a product, it will cause serious yellowing at high temperature due to the existence of a small amount of acidic substance.

Method used

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  • A kind of high folding and anti-yellowing LED encapsulation silica gel
  • A kind of high folding and anti-yellowing LED encapsulation silica gel
  • A kind of high folding and anti-yellowing LED encapsulation silica gel

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Step 1: The synthesis and post-treatment process of methylphenyl hydrogen-containing silicone resin is as follows:

[0025] Into a 500mL three-neck flask equipped with a constant pressure funnel, thermometer, magnetic stirring and distillation device, add 141.85g of hydrogen dimethylacetoxysilane, 200mL of toluene and 0.1g of trifluoromethanesulfonic acid in sequence, and raise the temperature to 50°C under stirring After 30 minutes, add 79.32g of phenyltrimethoxysilane dropwise to the reaction flask with a constant pressure funnel. After the dropwise addition, continue to stir the reaction for 1 hour, and heat up to 80°C to distill off the low boiling point liquid; after cooling to room temperature, first Wash with deionized water until neutral, add 5% NaHCO 3 Stir for 1 hour, then wash with deionized water until neutral, and then rotary evaporate to obtain 127.66 g of a colorless transparent liquid shown in the following formula, with a yield of 97.1%. The molecular f...

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PUM

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Abstract

The invention provides LED packaging silica gel with a high refractive index and particularly provides LED packaging silica gel with the same refractive index (phenyl content) and yellowing resistance. A special aftertreatment method is adopted on the basis that hydrogen-containing methylphenyl silicone resin and a hydrogen-containing chain extender are synthesized, so that the impurity content is reduced, and the high-temperature yellowing of the LED packaging silica gel is reduced. The LED packaging silica gel provided by the invention is high in refractive index (1.54) and remarkable in high-temperature yellowing resistance.

Description

technical field [0001] The invention relates to LED packaging silica gel, in particular to LED packaging silica gel with high refractive index and yellowing resistance, and belongs to the technical field of adhesives. Background technique [0002] High-fold LED packaging silica gel has become an important packaging material because of its small internal stress, good aging resistance, high and low temperature resistance, and high luminous flux, and is widely used in the field of LED packaging. [0003] However, silicone materials, especially high-refractive-index silicone materials, due to the high phenyl content and the presence of trace amounts of acidic substances in the raw material synthesis process, cause high-refractive index LED packaging silica gel to yellow during continuous high-temperature aging, resulting in low luminous flux. decline. For the same phenyl content, some high-refractive index packaging silica gels have low yellowing and some have serious yellowing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J183/07C09J183/05C09J11/06H01L33/56
Inventor 陈维庄恒冬张学超王建斌陈田安
Owner YANTAI DARBOND TECH