A kind of organosilicon composition for encapsulation of purple LED and preparation method thereof

An LED packaging and silicone technology, applied in the direction of adhesive additives, polymer adhesive additives, non-polymer adhesive additives, etc. Excellent UV resistance and aging resistance, good compatibility and stability, and stable product performance

Active Publication Date: 2021-07-30
广州天宸高新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, organic materials such as silicone and epoxy are prone to rapid aging under the action of ultraviolet light, which affects the luminous efficiency and service life; inorganic materials are difficult to process and shape due to poor bonding performance, which limits their application.
There are reports at home and abroad to directly add UV absorbers (such as o-hydroxybenzophenone) directly into organic materials, but this type of UV absorbers has poor compatibility with organic materials, and belongs to small molecule materials that are easy to volatilize at high temperatures, so that Difficult to promote and apply
The main problems existing in the existing purple light LED encapsulation glue include: (1) the addition of commonly used ultraviolet absorbers in the glue has problems such as small molecular weight, easy volatilization, poor transparency, and poor dispersibility leading to poor storage stability; 2) Although a single UV absorber has obvious anti-ultraviolet effect, the long-term stability effect is poor. After a long time, the encapsulation glue is easy to change color or even become brittle and cracked, thus affecting the luminous efficiency and color temperature of purple LEDs
Although the organopolysiloxane composition for encapsulating ultraviolet light-emitting diodes exhibits good ultraviolet light resistance characteristics, the ultraviolet light absorber used is very easy to migrate, and the long-term aging resistance performance is not ideal

Method used

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  • A kind of organosilicon composition for encapsulation of purple LED and preparation method thereof
  • A kind of organosilicon composition for encapsulation of purple LED and preparation method thereof
  • A kind of organosilicon composition for encapsulation of purple LED and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 Preparation of benzophenone UV-absorbing polysiloxane

[0029] In a three-necked flask equipped with a stirrer, a thermometer and a reflux condenser, add 21.4g of 2,4-dihydroxybenzophenone, 1g of calcium carbonate and 40g of deionized water in sequence, and heat up to 80°C while stirring with nitrogen gas , then add 11.4g allyl glycidyl ether dropwise, react for 3 hours, cool to room temperature, adjust the pH to 6.6 with dilute hydrochloric acid, extract with benzene, filter, wash with water, and remove low boiling substances under reduced pressure to obtain transparent Viscous liquid: Take 16.4g of the above viscous liquid and put it into a three-necked bottle, add 30g of phenyl hydrogen-containing silicone oil and 50mL of toluene solvent, stir, heat up to 62°C, add dropwise 0.1g of platinum catalyst (chloroplatinic acid-tetramethyl Divinyldisiloxane complex, the content of platinum is 5000ppm), after 4 hours of reaction at a temperature of 80°C, filter, was...

Embodiment 2

[0032] Example 2 Preparation of benzophenone UV-absorbing polysiloxane

[0033] In a three-necked flask equipped with a stirrer, a thermometer and a reflux condenser, add 21.4g of 2,4-dihydroxybenzophenone, 1g of calcium carbonate and 40g of deionized water in sequence, and heat up to 80°C while stirring with nitrogen gas , then add 11.4g allyl glycidyl ether dropwise, react for 3 hours, cool to room temperature, adjust the pH to 6.3 with dilute hydrochloric acid, extract with benzene, filter, wash with water, and remove low boiling substances under reduced pressure to obtain transparent Viscous liquid: Take 16.4g of the above viscous liquid into a three-necked bottle, add 30g of phenyl hydrogen-containing silicone oil and 50mL of toluene solvent, stir, heat up to 60°C, add dropwise 0.1g of platinum catalyst (alcoholic solution of chloroplatinic acid, The content of platinum is 4000ppm), and the reaction temperature is controlled at 80°C for 4 hours, filtered, washed with wate...

Embodiment 3

[0035] Example 3 Silicone composition for violet LED encapsulation

[0036] A silicone composition for encapsulation of purple light LEDs, including components A and B of equal mass; component A includes the following raw materials in parts by mass: 100 parts by mass of phenylvinyl silicone resin, 0.15 parts of platinum series catalyst, and 2 parts by mass of tackifier parts, 1 part of antioxidant; the B component includes the following raw materials in parts by mass: 60 parts of phenylvinyl silicone resin, 45 parts of crosslinking agent, 0.04 part of inhibitor, and 1.8 parts of ultraviolet absorber. The vinyl content of phenylvinyl silicone resin is 4%, the viscosity is 12000mPa s, the refractive index is 1.54, the platinum series catalyst is chloroplatinic acid-tetramethyldivinyldisiloxane complex, and the content of platinum is 5000ppm, the antioxidant is β-(3,5-di-tert-butyl-4-hydroxyphenyl) n-octadecyl propionate, and the tackifier is γ-methacryloxypropyl trimethoxy base...

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Abstract

The invention provides a silicone composition for encapsulating purple light LEDs, which includes components A and B in equal mass; the component A includes the following raw materials in parts by mass: 90-110 parts of phenylvinyl silicone resin, platinum 0.1-0.5 parts of catalyst, 1-5 parts of tackifier, 0.5-2 parts of antioxidant; the B component includes the following raw materials in parts by mass: 50-80 parts of phenyl vinyl silicone resin, 30 parts of crosslinking agent ~60 parts, inhibitor 0.01~0.1 part, ultraviolet absorber 0.5~3 parts. The invention belongs to the technical field of LED encapsulation adhesives. The organic silicon composition for encapsulating purple LEDs provided by the invention has excellent ultraviolet resistance and aging resistance, can reduce light attenuation of purple LEDs, and prolong service life.

Description

technical field [0001] The invention belongs to the technical field of LED encapsulating adhesives, and in particular relates to an organic silicon composition for encapsulating purple light LEDs and a preparation method thereof. Background technique [0002] Silicone materials are widely used as packaging materials for white LED packaging due to their good high and low temperature resistance, mechanical properties, adhesive properties, optical properties and construction properties. Compared with white LEDs, purple LEDs have shorter wavelengths, which are more likely to cause aging and deterioration of packaging materials. The most prominent manifestations are yellowing of packaging materials, decreased light transmittance, and even brittle cracking, which affects the light efficiency and life of LEDs. Purple LED has the characteristics of high color rendering index and high luminous efficiency, and has a very wide application prospect. The quality of packaging materials pl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J183/07C09J11/08C09J11/06
Inventor 邱浩孟温茂添戴思维梁光岳
Owner 广州天宸高新材料有限公司
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