Polymer-based dielectric composite material of silica-coated calcium copper titanate nanofiber, and preparation method thereof

A technology of copper calcium titanate and nanofibers, which is applied in fiber processing, artificial filaments of inorganic materials, textiles and papermaking, etc., can solve problems such as high dielectric loss, achieve dielectric loss suppression, improve dielectric properties, and The effect of increasing the electrical constant

Inactive Publication Date: 2018-05-11
南通洪明电工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it still has the disadvantage of high dielectric loss, so there are few reports on its research on dielectric energy storage composites

Method used

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  • Polymer-based dielectric composite material of silica-coated calcium copper titanate nanofiber, and preparation method thereof
  • Polymer-based dielectric composite material of silica-coated calcium copper titanate nanofiber, and preparation method thereof
  • Polymer-based dielectric composite material of silica-coated calcium copper titanate nanofiber, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Example 1 Preparation of copper calcium titanate nanofibers by electrospinning

[0009] (1) Calcium nitrate, copper acetate, and tetrabutyl titanate are configured into a solution according to a molar ratio of 1:3:4, and the solvent is acetic acid and ethanol (volume ratio 1:1). After stirring and dissolving, polyvinylpyrrolidone is added, Continue stirring for 1 hour;

[0010] (2) Put the above solution into a syringe, and carry out electrospinning under the impetus of a propulsion pump. The spinning voltage range is 19 kV, and aluminum foil is used as a receiver;

[0011] (3) After the spinning is finished, remove the fiber from the aluminum foil and put it into a crucible, and sinter it in a muffle furnace under an air atmosphere at a temperature range of 800 degrees Celsius to finally obtain copper calcium titanate nanofibers.

Embodiment 2

[0012] Example 2 Preparation of silica-coated copper calcium titanate nanofibers by hydrolysis of tetraethyl orthosilicate

[0013] (1) Place 1 gram of copper calcium titanate nanofibers prepared in Example 1 in a mixed solvent of ethanol-water, the volume ratio of water and ethanol in the mixed solvent is 1:2, and ultrasonically treat for 1 h under mechanical stirring .

[0014] (2) In the above solution, under strong mechanical stirring, slowly add 2 ml of tetraethyl orthosilicate dropwise, after continuous stirring for 30 minutes, slowly add 2 ml of ammonia water dropwise, and continue stirring for 2 hours.

[0015] (3) Transfer the above solution into a centrifuge tube, and centrifuge at a speed of 3000 rpm for 30 minutes, discard the supernatant, and dry the lower part of the precipitate at a drying temperature of 70 degrees Celsius and a drying time of 12 hours , and finally obtain silica-coated copper calcium titanate nanofibers.

Embodiment 3

[0016] Example 3 Preparation of polyvinylidene fluoride composite film by solution casting method

[0017] (1) Uniformly disperse 0.12 g of the silica-coated copper calcium titanate nanofibers prepared in Example 2 in 9 g of N,N-dimethylformamide, and ultrasonicate for 1 hour.

[0018] (2) Add 1 gram of polyvinylidene fluoride powder to the above solution, and keep stirring for 12 hours.

[0019] (3) The above solution was poured on a clean and flat glass plate, cast to form a film, and dried at 70 degrees Celsius for 12 hours to obtain a polyvinylidene fluoride composite film of silica-coated copper calcium titanate nanofibers.

[0020] The composite films prepared in the above examples were tested, and the results showed that the dielectric constant of polyvinylidene fluoride composites coated with copper calcium titanate nanofibers was increased by about 8 compared to pure polyvinylidene fluoride. to 12, while the dielectric loss is only 0.01 to 0.03, effectively suppressi...

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Abstract

The invention provides a preparation method of a polymer-based dielectric composite material of a silica-coated calcium copper titanate nanofiber. The method comprises the following steps: preparing acalcium copper titanate nanofiber through an electrospinning technology, uniformly coating the calcium copper titanate nanofiber with a layer of silica by using the hydrolysis characteristic of tetraethyl orthosilicate in an alkaline solution, and uniformly dispersing the obtained filler in a polymer matrix through a solution dispersion technology or a melt blending technology to produce a composite film. The inorganic ceramic filler is coated with the silica insulating layer in the preparation method, so the dielectric loss of the composite material is reduced and the breakdown strength is improved while preserving the high dielectric properties. The composite material can be applied to high-energy density dielectric capacitors as a dielectric layer due to its excellent dielectric properties.

Description

technical field [0001] The invention relates to a high-dielectric, low-loss silicon dioxide-coated copper calcium titanate nanofiber polymer-based dielectric composite material, which is the key to preparing high-performance dielectric capacitors and belongs to the field of electrical / electronic materials . Background technique [0002] New dielectric materials with high dielectric constant have important application prospects in information technology, microelectronics, power engineering, national defense technology and other fields, so they have attracted widespread attention. As a long-standing problem in the research of pulse power technology, dielectric materials with high energy storage density have always been a hot spot in the research of pulse power technology. However, the development has been slow for decades. Although some progress has been made at the end of the 20th century and the beginning of the 21st century, it is still difficult to meet the needs of the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08K9/02C08K7/08C08J5/18D01F9/08D06M11/79
CPCC08J5/18C08J2327/16C08K7/08C08K9/02C08K2201/011C08L2203/16D01F9/08D06M11/79C08L27/16
Inventor 党智敏
Owner 南通洪明电工科技有限公司
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