Graphene oxide-modified silicone rubber composite and preparation method thereof

A graphene modification and composite material technology, applied in the field of materials science, can solve problems such as reliability, UV resistance, thermal aging performance that cannot meet packaging requirements, and achieve significant technological progress, improved dispersibility, and no decrease in light transmittance. Effect

Inactive Publication Date: 2016-06-22
SHANGHAI INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the above-mentioned technical problems in the prior art, the invention provides a kind of graphene oxide modified silicone rubber composite material and its preparation method, described this graphene oxide modified silicone r

Method used

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  • Graphene oxide-modified silicone rubber composite and preparation method thereof
  • Graphene oxide-modified silicone rubber composite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 0.2g of graphene oxide and 200g of absolute ethanol into a 500mL four-necked flask, and disperse into a uniform solution under ultrasonic wave of 500W for 30min. Put the flask in an oil bath, add 2 g of silane coupling agent KH550 dissolved in 5 g of absolute ethanol under mechanical stirring, and heat up at 80° C. for 24 h under reflux. Cool down after the reaction, centrifuge the mixture at a centrifugal speed of 10,000r / min for 6min, wash the precipitate repeatedly with absolute ethanol, dry the precipitate at 60°C for 24h in vacuum, and grind to obtain the silane coupling agent-modified Graphene oxide.

[0031] Weigh 100g of phenyl silicone rubber, add 0.01% modified graphene oxide to 5g of acetone for ultrasonic dispersion for 30min, add it into the silicone rubber and ultrasonically disperse for 30min, then raise the temperature to 60°C to remove the solvent. After the solvent is evaporated to dryness, add 1g of stannous octoate and 1g of tetraethyl orthosili...

Embodiment 2

[0033] Add 0.2g of graphene oxide and 200g of absolute ethanol into a 500mL four-necked flask, and disperse into a uniform solution under ultrasonic wave of 500W for 30min. Put the flask in an oil bath, add 2 g of silane coupling agent KH550 dissolved in 5 g of absolute ethanol under mechanical stirring, and heat up at 80° C. for 24 h under reflux. Cool down after the reaction, centrifuge the mixture at a centrifugal speed of 10,000r / min for 6min, wash the precipitate repeatedly with absolute ethanol, dry the precipitate at 60°C for 24h in vacuum, and grind to obtain the silane coupling agent-modified Graphene oxide.

[0034] Weigh 100g of phenyl silicone rubber, add 0.1% modified graphene oxide to 10g of acetone for ultrasonic dispersion for 30min, add it into the silicone rubber and ultrasonically disperse for 30min, then raise the temperature to 60°C to remove the solvent. After the solvent is evaporated to dryness, add 2g of stannous octoate and 5g of tetraethyl orthosili...

Embodiment 3

[0036] Add 0.2g of graphene oxide and 200g of N,N-dimethylformamide (DMF) into a 500mL four-neck flask for ultrasonic dispersion for 30min, place in an oil bath, heat up to 80°C with mechanical stirring, fill with nitrogen, add 5g of DMF to dissolve 2g of diphenylmethane diisocyanate (MDI) was added dropwise to 5 drops of dibutyltin dilaurate, and reacted for 24h under a nitrogen atmosphere. After the reaction, the reaction solution was centrifuged at a speed of 10000r / min, and the reaction solution was repeatedly washed with DMF and then acetone until the residual MDI was completely washed away, and the solid obtained by centrifugation was dried at 50°C for 24 hours in vacuum, and it was ready after grinding. Isocyanate-modified graphene oxide was obtained.

[0037] Weigh 100g of phenyl silicone rubber, add 0.1% modified graphene oxide into 10g of acetone for ultrasonic dispersion for 30min, add it into the silicone rubber and ultrasonically disperse for 30min, and raise the ...

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Abstract

A graphene oxide modified silicone rubber composite material of the present invention, calculated in parts by weight, consists of 100 parts of phenyl silicone rubber, 0.01-0.2 parts of graphene oxide modified by silane coupling agent or graphene oxide modified by isocyanate , 1-3 parts of stannous octoate, 1-10 parts of tetraethyl orthosilicate. The present invention also provides a preparation method for the above-mentioned graphene oxide modified silicone rubber composite material, wherein the modified graphene oxide is ultrasonically dispersed, and added to the silicone rubber to form a uniform mixed solution by ultrasound, and the solvent is removed in a vacuum oven , add a catalyst and a curing agent, pour into a mold for vacuum defoaming, and cure at room temperature to obtain a graphene oxide-modified nanocomposite material. The invention utilizes silane coupling agent and isocyanate to improve the compatibility of graphene oxide, significantly improves the dispersion of graphene in phenyl silicone rubber, and the prepared phenyl silicone rubber material has excellent dielectric properties and thermal conductivity properties and mechanical properties.

Description

technical field [0001] The invention belongs to the field of materials science and relates to a silicone rubber, in particular to a graphene oxide modified silicone rubber composite material and a preparation method thereof. Background technique [0002] Phenyl silicone rubber is a room temperature vulcanized silicone rubber in which phenyl groups are introduced into the siloxane main chain of silicone rubber. RTV silicone rubber has been widely used in electronic device products in recent years, especially packaging materials. Silicone rubber itself has good electrical insulation, weather resistance, heat resistance and other properties. As a packaging material, it is required to have good light transmission, heat dissipation, electrical insulation and aging resistance. With the development of light-emitting diodes (LEDs), traditional packaging materials can no longer meet the requirements of packaging in terms of reliability, UV and heat aging resistance, and silicone mat...

Claims

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Application Information

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IPC IPC(8): C08L83/04C08K9/06C08K9/04C08K3/04C08K5/5415
CPCC08K9/06C08K3/04C08K5/5415C08K9/04C08K2201/003C08K2201/006C08L2201/08C08L83/04
Inventor 高群徐燕欧阳春发蓝振华
Owner SHANGHAI INST OF TECH
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