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A flexible dielectric elastomer composite material based on nano liquid metal and its preparation method

A dielectric elastomer and liquid metal technology, applied in the field of dielectric materials, can solve the mismatch between flexibility and rigidity of inorganic fillers, the inability to exert nano-fillers, and the inability of high dielectric constant and low dielectric loss of dielectric composite materials to take into account and other problems to achieve the effect of increasing elastic modulus, preventing oxidation and reducing agglomeration

Active Publication Date: 2020-10-02
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention provides a flexible dielectric elastomer composite material based on nanometer liquid metal and its preparation method, which solves the technical problems: (1) the mismatch between the flexibility of the elastomer and the rigidity of the inorganic filler in the dielectric composite material; (2) The distribution of liquid metal in the elastomer is at the micron level, which cannot play the role of nano-fillers; (3) The high dielectric constant and low dielectric loss of dielectric composite materials cannot be balanced

Method used

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  • A flexible dielectric elastomer composite material based on nano liquid metal and its preparation method
  • A flexible dielectric elastomer composite material based on nano liquid metal and its preparation method

Examples

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Effect test

Embodiment 1

[0041] Embodiment 1: M / R=33:100

[0042] Nano liquid metal / elastomer flexible dielectric composites were prepared with Dow Corning's silicone rubber DC3481 as the elastomer matrix.

[0043] (1) 1g Galinstan liquid metal (liquid metal is purchased from alfa company, its composition is Ga:In:Sn=62wt%:22wt%:16wt%, density is 6.359g / cm 3 , melting point is 10.7℃), 0.02g of 3-mercaptopropyltriethoxysilane (KH580) was added to 70mL of absolute ethanol, ice-water bath, 2000W ultrasonic pulverization for 30min, the liquid metal was dispersed into a spherical shape with an average particle size of about 85nm Droplets to obtain a stable nano-liquid metal emulsion;

[0044] (2) Invert the obtained nano-liquid metal emulsion into a centrifuge tube, gently centrifuge at 3000r / min for 30min, remove the supernatant, and centrifuge and wash with absolute ethanol for 2-3 times. After the washing is completed, add 50mL of ethyl acetate to obtain a dispersed nano liquid metal emulsion;

[004...

Embodiment 2

[0046] Embodiment 2: M / R=100:100

[0047] The preparation method is the same as in Example 1, except that the Galinstan liquid metal content in the step (1) is 3g, the KH580 content is 0.06g, and the dehydrated alcohol content is 100mL, and the ethyl acetate content in the step (2) is 70mL, and the liquid metal The average particle size is 99nm. The test method is the same as in Example 1, and the test results are shown in Table 1.

Embodiment 3

[0048] Embodiment 3: M / R=300:100

[0049] The preparation method is the same as in Example 1, except that the content of Galinstan liquid metal in step (1) is 9g, the content of KH580 is 0.09g, the content of absolute ethanol is 150mL, and the content of ethyl acetate in step (2) is 100mL. The average particle size of the liquid metal is 95nm, the test method is the same as in Example 1, and the test results are shown in Table 1.

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Abstract

The invention relates to a flexible dielectric elastomer composite material based on nanometer liquid metal. The flexible dielectric elastomer composite material comprises an elastomer and the liquidmetal and is prepared by the following steps: preparing a mercaptan-coated nanometer liquid metal emulsion through ultrasonic crushing, dissolving the elastomer in a solvent, then mixing with the nanometer liquid metal emulsion and uniformly stirring to obtain a liquid metal / elastomer / solvent suspension; obtaining the flexible dielectric elastomer composite material through hot pressing film formation or room-temperature curing. The flexible dielectric elastomer composite material provided by the invention has the benefits that dielectric constants of the composite material are improved, the dielectric loss is effectively reduced, and meanwhile, the elastic modulus of the composite material is not significantly increased, so that the problems of poor compatibility and flexibility of a dielectric elastomer modified by traditional inorganic rigid packing are solved, and the liquid metal-based dielectric elastomer composite material capable of meeting the requirements of a flexible wearable technology is prepared.

Description

technical field [0001] The invention relates to the field of dielectric materials, and further relates to a flexible dielectric elastomer composite material and a preparation method thereof. Background technique [0002] In recent years, with the development of wearable technology, soft robots and other fields, the development of flexible electronic systems for sensing, driving, and energy conversion has become one of the core tasks. The electrical properties of dielectric elastomer materials such as polysiloxane, polyurethane or block copolymers are usually obtained by adding 10-30% volume fraction of inorganic fillers. These inorganic fillers can be silver (Ag) powder, Ag coated Coated nickel (Ni) microspheres, structured carbon black (CB), exfoliated graphite, carbon nanotubes (CNT), barium titanate (BaTiO 3 ), titanium dioxide (TiO 2 ) other metallic, carbon-based or ceramic micro / nanoparticles. Although rigid particles are introduced into the elastomeric matrix to in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/04C08L75/04C08K9/06C08K3/08
CPCC08K3/08C08K9/06C08K2201/011C08L2207/04C08L83/04C08L75/04
Inventor 田明赵琪宁南英张立群邹华王文才
Owner BEIJING UNIV OF CHEM TECH
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