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Method for preparing flexible composite material with low filler content and high electrical conductivity on basis of swelling penetration method

A technology of filler content and composite materials, applied in the field of composite materials, can solve the problems of high carbon nanotube content, affecting flexibility and sensitivity, etc., and achieve the effects of simple method, low cost and low resistivity

Inactive Publication Date: 2017-12-01
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the above preparation methods, carbon nanotubes are dispersed into the polymer matrix by solution o

Method used

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  • Method for preparing flexible composite material with low filler content and high electrical conductivity on basis of swelling penetration method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Weigh 10g of polydimethylsiloxane and 0.05g of crosslinking agent hydroxy silicone oil, cure at 100°C for 2h, and then swell in hexane for 15min. Configure a mixed solution of DMF and water (weight ratio DMF:water=10:1), then add CNTs at a concentration of 0.3 mg / ml, and ultrasonically disperse to obtain a suspension, wherein the CNTs have a diameter of 2 nm and a length of 0.5 μm; the swelling The rubber was placed in the suspension of CNTs, and heated in a water bath at 30°C for 12 hours; the composite material was taken out, ultrasonically cleaned with deionized water for 1 hour, and then dried in a 60°C oven for 12 hours until completely dry.

Embodiment 2

[0044] Weigh 10g of polydimethylsiloxane and 2g of crosslinking agent 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, cure at 100°C for 2h, then place in toluene to swell 180min. Configure a mixed solution of NMP and water (weight ratio NMP: water = 1: 10), then add CNTs at a concentration of 1.5 mg / ml, and ultrasonically disperse to obtain a suspension, wherein the CNTs have a diameter of 30 nm and a length of 100 μm; the swollen The rubber was placed in the suspension of CNTs, heated in a water bath at 90°C for 3 hours and ultrasonically cleaned for 3 hours; the composite material was taken out, ultrasonically cleaned with deionized water for 1 hour, and then dried in a 60°C oven for 12 hours until completely dry.

Embodiment 3

[0046] Weigh 10g of methyl vinyl silicone rubber and 0.5g of cross-linking agent dicumyl peroxide, cure at 100°C for 2h, and then swell in toluene for 60min. Prepare a mixed solution of DMF and water (weight ratio DMF:water=4:1), then add CNTs at a concentration of 1.5 mg / ml, and ultrasonically disperse to obtain a suspension, wherein the diameter of the CNTs is 20 nm and the length is 30 μm; the swollen The rubber was placed in the suspension of CNTs, and heated in a water bath at 70°C for 3 hours with ultrasound; the composite material was taken out, cleaned ultrasonically with deionized water for 1 hour, and then dried in an oven at 60°C for 12 hours until completely dry.

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Abstract

The invention provides a method for preparing a flexible composite material with low filler content and high electrical conductivity on the basis of a swelling penetration method. The conductive composite material can be applied to the fields of electric heating materials, flexible conductors and the like. The method comprises steps as follows: firstly, cross-linked and cured rubber is swollen in a solvent, the swollen silicone rubber is subjected to water-bath heating ultrasonic treatment in a suspension of CNTs (carbon nano tubes) or graphene, then the composite material is taken out and subjected to ultrasonic cleaning, and finally, the sample is subjected to vacuum drying, wherein the rubber is polydimethylsiloxane, methyl vinyl silicone rubber or methyl phenyl vinyl silicone rubber, the solvent for swelling the rubber is methylbenzene or hexane, and the solvent of the suspension of the CNTs is N,N-dimethylformamide or a mixed solvent of 1-methyl-2-pyrrolidone and water. The prepared silicone rubber conductor has the advantages of high electrical conductivity, low electrical resistivity, low filler content and stress-sensitive, the electrical resistivity at room temperature is as low as 0.55 omega.m, the consumption of the CNTs or graphene is far lower than 0.1wt%, the breaking elongation of the composite material is higher than 300%, and relative electrical resistivity change reaches 1200%.

Description

technical field [0001] The invention relates to a polymer-based conductive composite material and a preparation method thereof, in particular to a method for preparing a flexible composite material with low filler content and high conductivity based on a swelling infiltration method, and belongs to the field of composite materials. Background technique [0002] Polymer-based conductive composites have the characteristics of good flexibility and easy processing, and have a wide range of applications. Among them, polymer-based flexible conductors are widely used at present. Flexible conductor refers to a new type of intelligent electronic material that maintains electrical properties when the material is subjected to a large strain. Its electrical properties change with strain and have a wide range of applications. Factors restricting the preparation and application of polymer-based composite materials and flexible conductors include: complex preparation process, large amount...

Claims

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Application Information

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IPC IPC(8): C08L83/04C08L83/06C08L83/07C08K7/24C08K3/04
CPCC08K3/04C08K7/24C08K2201/001C08K2201/003C08K2201/004C08K2201/011C08L83/04C08L83/06
Inventor 张荣胡圣飞刘清亭徐成成高浩王非彭秋梅
Owner HUBEI UNIV OF TECH
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