High-voltage resistant polymer-based dielectric material and preparation method thereof

A technology of polymers and electrical materials, applied in the field of high-voltage resistant polymer-based dielectric materials and their preparation, can solve the problems of low voltage resistance, change, and temperature rise of conductive positions, and achieve improved voltage resistance and improved voltage resistance , good effect of pressure resistance

Active Publication Date: 2020-11-24
深圳市峰泳科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the disadvantage of this method is: on the one hand, when the filling amount of barium titanate is small, the dielectric constant of the polymer-based dielectric material does not change significantly, and it needs to be filled with enough barium titanate. The dielectric constant of the material will change significantly
[0004] Through the analysis of withstand voltage failure products, it is found that the main reason for the low withstand voltage of composite materials is that after the barium titanate filler reaches the critical volume concentration, the particles contact each other, and a conductive path will be formed after the voltage is applied, and the heat accumulated after the conductive path is formed It will increase the temperature of the conductive position and cause thermal breakdown, which will deteriorate the withstand voltage performance of the composite dielectric material

Method used

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preparation example Construction

[0027] The invention provides a method for preparing a high-voltage resistant polymer-based dielectric material, comprising the following steps: dissolving an organic polymer matrix in a first solvent to prepare an organic polymer solution; Add inorganic fillers containing mica and barium titanate to the dispersant solution prepared by mixing two solvents, and stir evenly to prepare a powder pre-dispersion solution; mix the organic polymer solution and the powder pre-dispersion solution evenly to form a medium an electrolytic solution; and coating the dielectric solution on the substrate, heating and curing to obtain a polymer-based dielectric material.

[0028] In one embodiment of the present application, the organic polymer solution is prepared by the following method: add the first solvent into a stirring device, add the organic polymer matrix at a stirring speed of 800-2000 rpm, and continue stirring to dissolve 1 to 24 hours, until the organic polymer matrix is ​​complet...

Embodiment 1

[0051] Add 25 g of methyl ethyl ketone into a magnetic stirrer, add 10 g of acrylic resin at a stirring speed of 50 rpm, and continue stirring and dissolving for 4 hours until the organic polymer acrylic resin forms a uniform transparent solution. Then use a 2 μm PP cotton filter core to filter the resulting solution to remove the undissolved organic polymer colloid to obtain an organic polymer solution.

[0052] Add 30 g of methyl ethyl ketone and 1 g of dispersant castor oil into a high-speed dispersion tank, and stir with a high-speed disperser at a stirring speed of 800 rpm for 2 hours until a uniform and transparent solution containing a dispersant is formed. Then, 5 g of synthetic muscovite flakes and 64 g of barium titanate were added under high-speed stirring at 1000 rpm, and the stirring was continued for 2.5 hours to obtain a powder pre-dispersion solution. The mass ratio of mica and barium titanate is about 0.078:1.

[0053] Add the organic polymer solution to the ...

Embodiment 2

[0057] The preparation process of the high-voltage resistant polymer-based dielectric material in Example 2 is similar to that in Example 1, except that the mass ratio of mica to barium titanate is 0.4:1. After testing, the dielectric constant of the obtained high-voltage resistant polymer-based dielectric material is 25.5, and the dielectric loss tangent value at 60Hz is t g δ is 0.07, and the average withstand voltage value of the 20μm thick sample is 410.3V.

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Abstract

The invention provides a high-voltage resistant polymer dielectric material and a preparation method thereof. By introducing mica into an organic polymer / barium titanate binary system, a ternary system of organic polymer / barium titanate / mica is formed, and the flake-shaped mica is interspersed into the polymer matrix, so that the barium titanate powder is uniformly dispersed in the organic polymermatrix, and is isolated by the mica, the formation of conductive paths is avoided, thermal breakdown is prevented, and thereby voltage resistance of products is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of flexible film capacitors, in particular to a high-voltage resistant polymer-based dielectric material and a preparation method thereof. Background technique [0002] With the development of electronic technology, there is an increasing demand for high dielectric constant polymers. However, the dielectric constant of the polymer itself is often very low, usually between 3 and 6, which cannot meet the needs of technological development. [0003] Therefore, improving the dielectric constant of polymer-based dielectric materials has become a very popular research field in recent years, and many literature reports have introduced methods for increasing the dielectric constant of polymer-based dielectric materials. One of the easiest methods is to fill the high dielectric constant barium titanate into the polymer bulk material. This method can increase the dielectric constant of the polymer-based dielectric m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08J3/215C08J3/21C08L33/12C08L63/00C08K3/24C08K3/34
CPCC08J3/212C08J3/215C08J5/18C08J2333/12C08J2363/00C08K3/24C08K3/34
Inventor 李峰刘侠侠陶玉红李露卢星华袁启斌
Owner 深圳市峰泳科技有限公司
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