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High-dielectric graphene-based elastomer composite material and preparation method thereof

A composite material and graphene-based technology, applied in the field of dielectric materials, can solve the problems of increased dielectric loss of elastomers, affecting safety, and reduced breakdown strength, so as to reduce dielectric loss, improve breakdown strength, and reduce The effect of the modulus of elasticity

Active Publication Date: 2021-03-09
ZHONGKAI UNIV OF AGRI & ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In terms of improving the dielectric constant, based on the percolation threshold theory, when the amount of conductive filler added is close to the percolation threshold, the dielectric constant increases sharply. Therefore, doping a certain conductive filler can increase the dielectric constant, but at the same time, the conductive filler The high electrical conductivity and the interfacial compatibility with the elastic matrix greatly increase the dielectric loss of the elastomer, resulting in a decrease in breakdown strength and affecting safety

Method used

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  • High-dielectric graphene-based elastomer composite material and preparation method thereof

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preparation example Construction

[0029] Preferably, the preparation method of described graphene dielectric filler comprises the following steps:

[0030] S1. Weigh 1g of non-ionic surfactant and dissolve it in deionized water to prepare a solution with a concentration of 1g / L to obtain solution A; weigh 0.32g of graphene oxide nanosheets and ultrasonically disperse them in 120ml of 1mol / L hydrochloric acid solution to obtain solution B; solution B was added to solution A, then 10ml of 30% hydrogen peroxide solution and 2.5g of trishydroxymethylaminomethane were added, and the mixed solution was heated to 35-40°C, Stir and mix for 10-30min to obtain solution C;

[0031] S2, take by weighing 0.38g of dopamine hydrochloride, join in the described solution C, and fully dissolve, continue to stir for 30-60min, obtain solution D; Take by weighing 3g of ammonium persulfate and prepare the aqueous solution of 0.1mol / L, and gradually Add dropwise to the solution D at a rate of 5-6ml / min. After the dropwise addition,...

Embodiment 1

[0046] A high-dielectric graphene-based elastomer composite material, comprising an elastic matrix and a graphene dielectric filler dispersed in the elastic matrix, the graphene dielectric filler being a graphene oxide nanosheet of porous polydopamine loaded on the surface , wherein, the mass ratio of the graphene dielectric filler to the elastic matrix is ​​1.1:100; the elastic matrix is ​​butyl acrylate elastomer;

[0047] The preparation method of described graphene dielectric filler comprises the following steps:

[0048] S1. Weigh 1g of P123 (EO 20 PO 70 EO 20 , Ma=5800) was dissolved in deionized water and prepared as a solution with a concentration of 1g / L to obtain solution A; 0.32g of graphene oxide nanosheets were weighed and ultrasonically dispersed in 120ml of 1mol / L hydrochloric acid solution to obtain a solution B: Add solution B to solution A, then add 10ml of 30% hydrogen peroxide solution and 2.5g of trishydroxymethylaminomethane, heat up the mixed solution...

Embodiment 2

[0054] Same as Example 1, the mass ratio of the graphene dielectric filler to the elastic matrix is ​​0.5:100.

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Abstract

The invention provides a high-dielectric graphene-based elastomer composite material, and belongs to the field of dielectric materials. The composite material comprises an elastic matrix and a graphene dielectric filler dispersed in the elastic matrix, the graphene dielectric filler is a graphene oxide nano sheet loaded with porous polydopamine on the surface, wherein the mass ratio of the graphene dielectric filler to the elastic matrix is (0.1-1.2): 100; the porous polydopamine is modified through surface coating, so that the filler is prevented from mutually overlapping to form a conductivepath, the conductivity is reduced, and meanwhile, the porous polydopamine surface layer structure improves the compatibility between the filler and an elastic matrix, reduces the dielectric loss caused by interface polarization and improves the breakdown strength.

Description

technical field [0001] The invention relates to the technical field of dielectric materials, in particular to a high-dielectric graphene-based elastomer composite material and a preparation method thereof. Background technique [0002] Dielectric elastomer (DE) is a smart soft material with high dielectric constant that can deform under the action of an electric field. It is an electroactive polymer that can convert electrical energy into mechanical energy. In the past 20 years It has gained widespread attention in the past few years. Coating flexible electrodes on both sides of the DE film can form a dielectric elastomer actuator (Dielectric elastomer actuator, DEA). When a voltage is applied through the two electrodes, the upper and lower electrodes generate Electrostatic force compresses the film, resulting in a smaller film thickness, which is manifested as the stretching of the film plane and electro-induced deformation; DEA has great potential in the fields of micro so...

Claims

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Application Information

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IPC IPC(8): C08L33/08C08K9/10C08K3/04
CPCC08K9/10C08K3/042C08K2201/001C08K2201/011C08L2201/04C08L33/08
Inventor 杨智诚吕建根卓献荣杨永民朱立学
Owner ZHONGKAI UNIV OF AGRI & ENG
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