Elastomer composite with high dielectric constant and low dielectric loss and preparation method thereof

A technology of high dielectric constant and composite materials, applied in the processing of textile materials, filament/thread forming, fiber processing, etc., can solve the problem of incompatibility between high dielectric constant and low dielectric loss, surface modification and coating Problems such as complicated process and limited dielectric loss can be achieved to solve the problems of high dielectric constant and low dielectric loss, increase percolation value, and low dielectric loss

Active Publication Date: 2013-07-10
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
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Problems solved by technology

[0005] The present invention designs an elastomer composite material with high dielectric constant and low dielectric loss and its preparation method, which solves the following problems: (1) The problem that the high dielectric constant and low dielectric loss of dielectric composite materials cannot be taken into account (2) The carbon nanotubes in the elastomer composite obtained by the existing preparation method are randomly dispersed, and the carbon nanotubes are easy to form lap joints, resulting in limited dielectric loss, and the surface modification and coating process is complicated , it is difficult to control

Method used

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  • Elastomer composite with high dielectric constant and low dielectric loss and preparation method thereof
  • Elastomer composite with high dielectric constant and low dielectric loss and preparation method thereof

Examples

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Embodiment 1

[0034] Example 1: Using thermoplastic polyurethane (TPU) with an amino content of 34% as an elastomer matrix, a carbon nanotube / TPU dielectric composite material with a carbon nanotube content of 0.5% and carbon nanotube orientation was prepared.

[0035] 1) Prepare a TPU / tetrahydrofuran (THF) solution, keep the temperature at 50°C for 2 hours until the TPU is completely dissolved; ultrasonically disperse a certain mass concentration of carboxyl-modified carbon nanotubes in N,N-dimethylformamide (DMF) dispersant 2h; mix the above TPU / THF solution with the carbon nanotube suspension, and stir magnetically to form a carbon nanotube / TPU / THF / DMF suspension in which the carbon nanotubes are uniformly dispersed, wherein the mass ratio of THF to DMF is 7:3. TPU is 5g; carbon nanotube is 0.025g; THF is 31.5g; DMF is 13.5g.

[0036] 2) Put the above solution in a plastic medical syringe, use a flat-ended stainless steel needle, that is, a syringe needle whose needle tip is smoothed wit...

Embodiment 2

[0039] Embodiment 2: The preparation method and testing method are the same as in Embodiment 1, except that the content of carbon nanotubes is 1.2%. The test results are shown in Table 1.

Embodiment 3

[0040] Embodiment 3: The preparation method and testing method are the same as in Embodiment 1, except that the content of carbon nanotubes is 1.6%. The test results are shown in Table 1.

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Abstract

The invention relates to elastomer composite with high dielectric constant and low dielectric loss and a preparation method thereof. The preparation method includes the steps of suspension allocation, electrospinning and post-treatment. Percolation value of the composite is increased by controlling directional arrangement of carbon nanotubes in substrate, so that dielectric constant of the composite is increased by increasing the content of the carbon nanotubes, the dielectric loss is kept low, and the problem that the high dielectric constant and the low dielectric loss are not balanced for the dielectric composite is solved.

Description

technical field [0001] The invention relates to the preparation and method of an elastomer composite material with high dielectric constant and low dielectric loss, in particular to an elastomer composite material with high dielectric constant and low dielectric loss obtained by controlling the orientation and arrangement of carbon nanotubes in a matrix Elastomeric composites and methods for their preparation. Background technique [0002] In recent years, elastomer-based dielectric materials with high dielectric constant and low dielectric loss have attracted extensive attention due to their potential applications in fields such as energy storage, sensors, and artificial muscles. Carbon nanotube / elastomer composites can obtain high dielectric constant while maintaining good mechanical properties through low carbon nanotube loading, but this significant increase in dielectric constant is usually accompanied by a large dielectric loss. increase, which limits its practical ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/4382D04H1/728D06C7/00D01D5/00D06B9/00
Inventor 田明白雪宁南英张立群卢咏来
Owner BEIJING UNIV OF CHEM TECH
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