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A kind of liquid silicone rubber/graphene airgel high conductivity composite material and preparation method thereof

A technology of graphene airgel and liquid silicone rubber, which is applied in the field of rubber to achieve broad development space, improve mechanical properties, and reduce material costs

Active Publication Date: 2021-03-26
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the current preparation methods of graphene / silicone rubber composites cannot solve this technical problem

Method used

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  • A kind of liquid silicone rubber/graphene airgel high conductivity composite material and preparation method thereof
  • A kind of liquid silicone rubber/graphene airgel high conductivity composite material and preparation method thereof
  • A kind of liquid silicone rubber/graphene airgel high conductivity composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0041] 1) Preparation of graphene oxide aqueous dispersion: ultrasonically disperse graphene oxide in deionized water to form a 4mg / ml graphene oxide dispersion, the ultrasonic time is 60min, the ultrasonic power is 1000w, and the ultrasonic frequency is 10kHz;

[0042] 2) Preparation of graphene hydrogel: Add 200ml of graphene oxide aqueous dispersion into a beaker, then add hydrazine hydrate whose mass is 3 times that of graphene oxide, and reduce for 2 hours at 60°C without stirring to obtain graphene hydrogel , soak the graphene hydrogel in deionized water for 48 hours, remove excess reducing agent, and replace the solvent 3 times during this period;

[0043] 3) Preparation of graphene airgel: freeze the graphene hydrogel with liquid nitrogen and put it into a freeze-drying box. The freeze-drying conditions are: the freezing temperature is -5~-25°C, and the drying temperature is -45~-60°C , the vacuum degree is 10-130Pa, and the drying time is 72h;

[0044] 4) Preparation...

Embodiment 1-2

[0046] 1) Preparation of graphene oxide aqueous dispersion: ultrasonically disperse graphene oxide in deionized water to form a 6mg / ml graphene oxide dispersion, the ultrasonic time is 60min, the ultrasonic power is 1000w, and the ultrasonic frequency is 10kHz;

[0047] 2) Preparation of graphene hydrogel: Add 200ml of graphene oxide aqueous dispersion into a beaker, then add hydrazine hydrate whose mass is 3 times that of graphene oxide, and reduce for 3 hours at 60°C without stirring to obtain graphene hydrogel , soak the graphene hydrogel in deionized water for 48 hours, remove excess reducing agent, and replace the solvent 3 times during this period;

[0048] 3) Preparation of graphene airgel: freeze the graphene hydrogel with liquid nitrogen and put it into a freeze-drying box. The freeze-drying conditions are: the freezing temperature is -5~-25°C, and the drying temperature is -45~-60°C , the vacuum degree is 10-130Pa, and the drying time is 72h;

[0049] 4) Preparation...

Embodiment 1-3

[0051] 1) Preparation of graphene oxide aqueous dispersion: ultrasonically disperse graphene oxide in deionized water to form 8mg / ml graphene oxide dispersion, ultrasonic time is 60min, ultrasonic power is 1000w, ultrasonic frequency is 10kHz;

[0052] 2) Preparation of graphene hydrogel: Add 200ml of graphene oxide aqueous dispersion into a beaker, then add hydrazine hydrate whose mass is 3 times that of graphene oxide, and reduce for 5 hours at 60°C without stirring to obtain graphene hydrogel , soak the graphene hydrogel in deionized water for 48 hours, remove excess reducing agent, and replace the solvent 3 times during this period;

[0053] 3) Preparation of graphene airgel: freeze the graphene hydrogel with liquid nitrogen and put it into a freeze-drying box. The freeze-drying conditions are: the freezing temperature is -5~-25°C, and the drying temperature is -45~-60°C , the vacuum degree is 10-130Pa, and the drying time is 72h;

[0054] 4) Preparation of liquid silicon...

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Abstract

The invention discloses a liquid silicone rubber / graphene aerogel highly conductive composite material and a preparation method thereof. The composite material is prepared from two-component additionliquid silicone rubber and graphene aerogel, wherein the graphene aerogel is 1 to 12 parts based on 100 parts by weight of vinyl silicone oil in the two-component addition liquid silicone rubber. According to the invention, the graphene aerogel is introduced as a filler conductive network on the basis of the preparation of the traditional two-component addition molding liquid silicone rubber, so that the excellent performance of the silicone rubber is maintained; meanwhile, the three-dimensional pore structure of the graphene aerogel is combined, so that the conductive percolation threshold ofthe silicone rubber is reduced, the technical problem of high filler parts is overcome, and the material cost is reduced.

Description

technical field [0001] The invention relates to the technical field of rubber, in particular to a liquid silicone rubber / graphene airgel high-conductivity composite material and a preparation method thereof. Background technique [0002] Silicone rubber is a type of elastomer with -Si-O- as the main chain and organic groups as side groups. It has excellent high and low temperature resistance, weather resistance, ozone resistance, aging resistance, physiological inertia and high air permeability. It is widely used in aerospace, automotive, electronics and medical equipment and other fields. However, silicone rubber has poor mechanical properties, electrical conductivity and thermal conductivity, and its volume resistivity is usually around 10. 11 About Ω·m, it needs to be blended with conductive fillers to improve conductivity. [0003] Conductive silicone rubber can be prepared by adding carbon-based or metal-based conductive fillers to silicone rubber by mechanical and so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/07C08L83/05C08K7/24
CPCC08K2201/001C08L83/04C08L2205/025C08L2205/03C08K7/24
Inventor 温世鹏李佳芮刘力
Owner BEIJING UNIV OF CHEM TECH
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