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Carbon nanotube in situ reinforced LED packaging silica gel and preparation method thereof

A technology of LED packaging and carbon nanotubes, which is applied in the direction of adhesives, adhesive additives, electrical components, etc., can solve the problems of waste acid waste water, low yield, troublesome preparation of MQ resin, etc., to improve mechanical properties, bonding The effect of good performance and high light transmittance

Inactive Publication Date: 2013-04-17
HANGZHOU COLORICH CHEM MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the addition of white carbon black in this method can improve the mechanical properties of silica gel, it often greatly reduces the light transmittance of the packaging material.
Reinforced with MQ resin, although high transparent silica gel with a certain mechanical strength can be obtained, but the preparation of MQ resin is more troublesome, waste acid waste water will be generated, and the yield is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 3 g of single-walled carbon nanotubes and 300 g of octamethylcyclotetrasiloxane to a clean 500 ml three-necked flask after plasma treatment for 1 h. After polymerization for 3 h under the catalysis of 5 g of 98% concentrated sulfuric acid, add 8.6 g of sodium bicarbonate, After stirring until neutral, filter to obtain a clear and transparent product, and its molecular structure is HOMe 2 SiO(Me 2 SiO) 180 Me 2 SiOH. Then the obtained product was mixed with 0.1g dibutyltin and 10g tetraethyl orthosilicate, after vacuum degassing for 30 minutes, it was solidified at room temperature 25°C for 8 hours, the hardness of the product was 45shore A, the tensile strength was 2.5MPa, and the tensile elongation at break The rate is 150%, and the light transmittance is 98.5%.

Embodiment 2

[0033] Add 6g of single-walled carbon nanotubes and 300g of octamethylcyclotetrasiloxane to a 500ml clean three-necked flask, and after polymerization for 5h under the catalysis of 5g of 70% concentrated sulfuric acid, add 3.86g of sodium carbonate and stir After reaching neutrality, filter to obtain a clear and transparent product, and its molecular structural formula is HOMe 2 SiO(Me 2 SiO) 1800 Me 2 SiOH. Then the obtained product was mixed evenly with 0.4g dimethyl tin and 6g isobutyl orthosilicate. After vacuum degassing for 10 minutes, it was cured at room temperature at 60°C for 4 hours. The hardness of the product was 22shore A, and the tensile strength was 1.4MPa. The elongation at break is 380%, and the light transmittance is 97.0%.

Embodiment 3

[0035] Add 9 g of single-walled carbon nanotubes and 300 g of octamethylcyclotetrasiloxane to a clean 500 ml three-necked flask, and after polymerization for 12 h under the catalysis of 10 g of 5% sulfuric acid, add 0.8 g of sodium bicarbonate and stir After reaching neutrality, filter to obtain a clear and transparent product, and its molecular structural formula is HOMe 2 SiO(Me 2 SiO) 40 Me 2 SiOH. Then the obtained product was mixed evenly with 0.1g of diethyltin and 10g of n-butyl orthosilicate. After vacuum degassing for 30 minutes, it was solidified at room temperature at 25°C for 8 hours. The product had a hardness of 60shore A and a tensile strength of 0.8MPa. The elongation at break is 50%, and the light transmittance is 95.5%.

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Abstract

The invention discloses a carbon nanotube in situ reinforced LED packaging silica gel and a preparation method of the carbon nanotube in situ reinforced LED packaging silica gel and relates to an LED packaging silica gel and the preparation method of the LED packaging silica gel. The carbon nanotube in situ reinforced LED packaging silica gel comprises the preparation steps of: 1, carrying out plasma treatment on carbon nanotubes for 1 to 2hours; 2, adding a certain amount of treated carbon nanotubes into an appropriate amount of dimethyl polysiloxane monomer, carrying out in-situ polymerization under the action of an acidic catalyst, after the polymerization is finished, adding an alkaline neutralizing agent to be neutralized in a neutral state, or carrying out water washing to be neutral, and removing residual moisture and obtaining simethicone which is modified by carbon nanotubes and of which the tail end is hydroxyl; and 3, uniformly mixing the product obtained in the step 2 with a crosslinking agent and a catalyst to prepare a potting silica gel which comprises a component A and a component B. With the adoption of the carbon nanotube in situ reinforced LED packaging silica gel, the mechanical property of the silica gel is improved, simultaneously, the silica gel is ensured to have high light transmittance.

Description

Technical field: [0001] The invention relates to LED packaging silica gel and a preparation method thereof, in particular to an LED packaging silica gel reinforced with carbon nanotubes in situ and a preparation method thereof. Background technique: [0002] LED is an energy-saving and environment-friendly lighting device. Packaging materials are indispensable for LED lighting devices, and silicone materials are ideal materials for LED packaging because of their excellent weather resistance, high and low temperature resistance, etc. At present, addition-type silica gel is mainly used, but it has the fatal defect of poor adhesion to the LED bracket. Chinese invention patent CN101544881 reports that α, ω-dihydroxypolydimethylsiloxane is used as the main raw material, mixed with inorganic filler white carbon black, plasticizer, crosslinking agent, coupling agent and catalyst to prepare silicone potting Plastic closures. Although the addition of white carbon black in this met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/06C09J11/04C08G77/16C08K9/00C08K7/00C08K3/04H01L33/56
Inventor 丁海燕吴洪正欧阳星帅宏喜
Owner HANGZHOU COLORICH CHEM MATERIALS
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