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Polymer-based composite material and preparation method thereof

A technology for polymer materials and composite materials, applied in the field of polymer matrix composite materials and their preparation, can solve the problems of increased dielectric loss tangent, decreased breakdown electric field, and difficulty in practical application.

Active Publication Date: 2019-05-03
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] To sum up, the existing polymer-based composite materials are generally difficult to take into account the improvement of breakdown electric field and relative permittivity.
Although increasing the proportion of inorganic nano-additives can increase the relative permittivity of polymer-based composites, it will lead to a rapid decrease in the breakdown electric field and an increase in the dielectric loss tangent. Therefore, the prepared polymer-based composites The energy density cannot be effectively improved, and it is difficult to be practically applied to the industry
The breakdown electric field of existing polymer-based composite materials is often low, such as less than 600MV / m, and the energy density rarely exceeds 20J / cm 3

Method used

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  • Polymer-based composite material and preparation method thereof
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  • Polymer-based composite material and preparation method thereof

Examples

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preparation example Construction

[0057] In the last part of the application, the preparation of the polymer-based composite material is carried out, that is, the polymer material, the modified negatively charged inorganic nano-sheets are mixed with a solvent, and the polymer-based composite material is obtained after casting. The solvent in the present invention refers to a solvent that can dissolve the selected polymer material, which can be adjusted by itself due to the substrates of different polymer materials selected, for example but not limited to, when the substrate is a fluorine-containing copolymer, For example, in the case of polyvinylidene fluoride, the substrate solvent may be N,N-dimethylformamide.

[0058] Preferably, after the step of mixing the modified negatively charged inorganic nanosheets with the polymer material and casting to obtain the polymer-based composite material, further including uniaxial stretching treatment of the polymer-based composite material, In order to obtain the polyme...

Embodiment 1

[0074] Example 1 Preparation of Modified Negatively Charged Inorganic Nanosheets

[0075] In this example, negatively charged inorganic nanosheets and polyethyleneimine are used to prepare modified negatively charged inorganic nanosheets, so that the surface of the negatively charged inorganic nanosheets is modified by polyethyleneimine. Please refer to figure 1 , and its detailed preparation method is as follows:

[0076] First, the reactants are prepared, and the reactants are potassium carbonate powder, calcium carbonate powder, and niobium oxide powder;

[0077] Mix the three powders evenly according to the stoichiometric ratio, and continue to grind them in an agate mortar for 3 hours, so that the reagents are mixed evenly and the particle size of the reactants is reduced. Insulated in a type resistance furnace to 1000-1200°C for 2-5 hours to obtain KCa 2 Nb3 o 10 Polycrystalline ceramic powder;

[0078] Next, the KCa 2 Nb 3 o 10 The polycrystalline ceramic powder ...

Embodiment 2

[0083] Embodiment 2 prepares polymer-based composite material

[0084] Mix the modified negatively charged inorganic nanosheets prepared in Example 1 with polyvinylidene fluoride as a substrate to prepare a polymer-based composite material, please refer to image 3 , and its detailed preparation method is as follows:

[0085] The modified Ca prepared in Example 1 is ready 2 Nb 3 o 10 Nanosheets;

[0086] Dispersing the modified negatively charged inorganic nanosheets in N,N-dimethylformamide solvent, followed by stirring for 5 hours to obtain a modified negatively charged inorganic nanosheet suspension;

[0087] Mix the polyvinylidene fluoride material and the above-mentioned negatively charged inorganic nanosheet suspension and stir at room temperature for 10 hours to obtain a mixed solution of the modified negatively charged inorganic nanosheet and the substrate, wherein the modified negatively charged Based on the total mass of the inorganic nanosheets and the substrat...

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Abstract

The invention provides a polymer-based composite material which is characterized by comprising a base material and modified negatively-charged inorganic nanosheets; wherein the base material is a polymer material; and the modified negatively-charged inorganic nanosheets are dispersed in the base material, the surface of the modified negatively-charged inorganic nanosheets is provided with non-removable negative charges, and an organic macromolecular cationic surfactant is adsorbed on the surface of the modified negatively-charged inorganic nanosheets. The polymer-based composite material provided by the invention utilizes a reverse local electric field generated by the modified negatively-charged inorganic nanosheets, and the number of secondary electrons caused by collision ionization isreduced, so that the polymer-based composite material has a high breakdown electric field so as to obtain high energy density, and the industrial application value of the material in the field of energy storage can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of dielectric materials, in particular to a polymer-based composite material and a preparation method thereof. Background technique [0002] With the gradual shortage of energy in the world, the issue of sustainable environmental management has attracted much attention, and the development of new energy technologies has gradually become a new indicator of global economic growth. Dielectric energy storage materials have intrinsic fast charge and discharge capabilities. Compared with other energy storage materials, they exhibit the highest power density and have been widely used in new energy, smart grids, hybrid vehicles, medical electronics, and pulse weapons. Therefore, dielectric energy storage materials have attracted extensive attention from research institutions and industries all over the world, in order to develop high-performance and low-cost energy storage materials. [0003] According to the relev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08K9/04C08K7/00
Inventor 侯闯明包志伟殷月伟李晓光
Owner UNIV OF SCI & TECH OF CHINA
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