Preparation method of organic silicon rubber for encapsulating LED being convenient for vacuum defoamation

A silicone rubber, LED packaging technology, used in chemical instruments and methods, adhesives, electrical components, etc., can solve the problem of low surface tension of polysiloxane, and achieve improved light transmittance, high light transmittance, and reduced surface The effect of tension

Inactive Publication Date: 2010-11-10
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for adding certain chemicals that make it easier to remove impurities from an optically clear liquid crystal display (LCD) panel package by reducing its surface's tendency towards water vapor transmission or absorption. By doing this, these materials improve the lifespan and performance of LC displays while maintaining their effectiveness over longer periods at elevated temperatures. These specialized compositions are useful for making packages like those made up of plastic films.

Problems solved by technology

The technical problem addressed in this patent relates to improving the durability and efficiency of LED packages made up of various types of materials like SiO2 glasses, polyvinylchloride elastomers, acrylic ester oligomer systems, alkali metal salts, ammonium sulfate solids, nitrocellulosistors containing carboxyl radicals, oxazoline rings, diketones, triarylsulfonamidine complexes, aliphatic unsaturation monools, quaternarylamines, phosphorus heteropolytibutyrils, and others. These chemical structures help improve mechanical stability and prevent degradations during production processes while maintaining desired characteristics such as color tone, clarity, transmission rate, UV ray absorption, thermal insulating property, waterproof effectiveness, and gas permeable ability.

Method used

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  • Preparation method of organic silicon rubber for encapsulating LED being convenient for vacuum defoamation
  • Preparation method of organic silicon rubber for encapsulating LED being convenient for vacuum defoamation
  • Preparation method of organic silicon rubber for encapsulating LED being convenient for vacuum defoamation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1) in N 2 Add to a 250mL dry three-necked bottle under protection polymerization Monomer D n Me,Ph (109.75g, 0.2022mol), D 4 Me,Vi (4.3g, 0.035mol), D 4 (10.035g, 0.0339mol). Remove the water in the monomer at 35℃~45℃ / -0.096MPa, then add the end-capping agent 1,1,3,3-tetramethyl-1,3-divinyl disiloxane (0.93 g, 0.005mol), catalyst tetramethylammonium hydroxide silicon alkoxide 2.48g, in N 2 Under protection, polymerize at 100°C for 5h, then decompose the catalyst at 150°C for 3-4h until the tail gas is neutral. Reduce the pressure to -0.096MPa, and gradually raise the temperature to 205°C to remove low-molecular compounds. Stop heating when there is no fraction within 5 minutes, and cool to room temperature. The obtained colorless and transparent product is the vinyl base polymer of LED packaging silicone rubber. The refractive index n was measured by a Bay refractometer D 25 =1.5350, the number average molecular weight measured by gel chromatography (GPC, usi...

Embodiment 2

[0051] 1) in N 2 Add monomer D to a 250mL dry three-neck flask under protection n Me,Ph (109.75g, 0.2022mol), D 4 Me,Vi (4.3g, 0.035mol), D 4 (9.305g, 0.0314mol), D 3 Me,F (1.1573g, 0.00247mol). Remove the water in the monomer at 35℃~45℃ / -0.096MPa, then add the end-capping agent 1,1,3,3-tetramethyl-1,3-divinyl disiloxane (0.93 g, 0.005mol), 6.23g rare earth solid superacid, in N 2 Under protection, polymerize at 100°C for 5h, and then filter to remove the catalyst. Reduce the pressure to -0.096MPa, and gradually raise the temperature to 205°C to remove low-molecular compounds. Stop heating when there is no fraction within 5 minutes, and cool to room temperature to obtain a colorless and transparent product, which is the vinyl base polymer of silicone rubber for LED packaging. The refractive index n was measured with an Abbe refractometer D 25 =1.5315, the number average molecular weight measured by GPC is 0.65×10 4 , the molecular weight distribution width (MWD) is...

Embodiment 3

[0055] 1) in N 2 Add monomer D to a 250mL dry three-neck flask under protection n Me,Ph (109.75g, 0.2022mol), D 4 Me,Vi (1.075g, 0.035mol), D 4 (7.842g, 0.02649mol), D 3 Me,F (3.4719 g, 0.00741 mol). Remove the water in the monomer at 35℃~45℃ / -0.096MPa, then add the end-capping agent 1,1,3,3-tetramethyl-1,3-divinyl disiloxane (0.93 g, 0.005mol), 6.23g strongly acidic cation exchange resin, in N 2 Under protection, polymerize at 100°C for 5h, and then filter to remove the catalyst. Reduce the pressure to -0.096MPa, and gradually raise the temperature to 205°C to remove low-molecular compounds. Stop heating when there is no fraction within 5 minutes, and cool to room temperature to obtain a colorless and transparent product, which is the vinyl base polymer of silicone rubber for LED packaging. The refractive index n was measured with an Abbe refractometer D 25 =1.5305, the number average molecular weight measured by GPC is 0.40×10 4 , the molecular weight distributio...

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Abstract

The invention relates to a preparation method of organic silicon rubber for encapsulating LED being convenient for vacuum defoamation, which aims at solving the technical problems that the surface tension of LED encapsulating silicon rubber is reduced, so the LED encapsulating silicon rubber is convenient for the vacuum defoamation, and the transmittance of the product is improved. The method comprises the following steps that: 1) transparent vinyl silicon oil containing methyl trifluoropropyl silica chain link and methyl-phenyl silica chain link is prepared; 2) transparent vinyl silicon oil is configured with methyl-phenyl hydrogen-containing silicon oil, platinum catalyst and inhibitor to A/B rubber; the mol ratio of Si-H and Si-Vi is 0.8 to 3: 1; the hydrogen content of the methyl-phenyl hydrogen-containing silicon oil is 1.6 to 1.0*10<-6> percent by weight; 3) A/B rubber is uniformly mixed, after being vacuum defoamed at the room temperature, the mixture is vulcanized to a product.

Description

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Claims

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Application Information

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Owner HANGZHOU NORMAL UNIVERSITY
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