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Heat treatment method for improving dielectric constant of insulating medium

A heat treatment method and a technology of dielectric constant, which are applied to insulators, circuits, electrical components, etc., can solve the problem of uninvolved dielectric constant, and achieve the effect of expanding the amorphous area, reducing the difficulty of the process, and reducing the size of the electric domain.

Inactive Publication Date: 2020-03-27
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Taking strong polar polythiourea as an example, studies have shown that changing the molecular structure can slightly adjust the dielectric constant of polythiourea, but even if polythiourea contains a large number of thiourea polar groups, its dielectric constant is usually at 4 About, only 10%-20% of the theoretical calculation value
However, no one has been involved in the research field of the influence of molecular chain state on the dielectric response characteristics and dielectric constant of polythiourea.

Method used

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  • Heat treatment method for improving dielectric constant of insulating medium
  • Heat treatment method for improving dielectric constant of insulating medium
  • Heat treatment method for improving dielectric constant of insulating medium

Examples

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Embodiment 1

[0040] A heat treatment method for improving the dielectric constant of an insulating medium, comprising the following steps;

[0041] 1) 2mmol of 1,4-phenylene diisothiocyanate was completely dissolved in 4mL of 4mL N,N-dimethylacetamide (DMAc), 2mmol of 1,3-cyclohexanediamine was added to the above solution, under nitrogen atmosphere , Reaction at room temperature for 24 hours. The reaction solution was slowly added into 100 mL of methanol, and a white fibrous insoluble polymer was precipitated. The polymer was collected by filtration, and placed under vacuum at room temperature for 2 hours to finally obtain a dry fibrous alicyclic polythiourea polymer.

[0042] 2) Dissolve 50mg polythiourea polymer in 1mL DMAc, stir until fully dissolved, filter to remove impurities, and use casting method to drop the clear polythiourea solution on the cleaned glass sheet, and place it in hot Treat at 60°C on the stage for 1 hour, then increase the temperature of the hot stage to 80°C for ...

Embodiment 2

[0045] The difference from the embodiment is that the heat treatment temperature is 110° C., and the other is the same as the embodiment, and the obtained polythiourea film is recorded as sample ②.

Embodiment 3

[0047] The difference from the example is that the heat treatment temperature is 120° C., and the other is the same as the example, and the obtained polythiourea film is recorded as sample ③.

[0048]see Figure 4 ,from Figure 4 It can be seen that after heat treatment of the alicyclic polythiourea sample for 2 hours, the dielectric constant reaches the maximum value of 9.98.

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Abstract

The invention discloses a heat treatment method for improving the dielectric constant of an insulating medium. The method comprises the steps that a polythiourea polymer is dissolved in a polar solvent and uniformly stirred, the polythiourea solution is dropwise added onto a glass sheet through a tape casting method, the glass sheet is placed on a heating bench for treatment for 0.5-1 hour at 55-65 DEG C, then the temperature of the heating bench is increased to 75-85 DEG C, treatment is carried out for 4-6 hours, finally, drying is carried out, and a polythiourea film is obtained; the polythiourea film is treated for 1-4 hours under the high-temperature condition of 100-140 DEG C and then placed in liquid nitrogen for quenching, and the polythiourea insulating medium is obtained. According to the method, the dielectric response characteristic of the polythiourea insulating medium is regulated by changing the heat treatment condition of the alicyclic polythiourea film and regulating the state of a polythiourea internal molecular chain, and the dielectric constant of the insulating medium is finally controlled or improved. The method can be widely applied to the fields of high-pressure energy storage equipment, high-energy pulse generators and the like.

Description

technical field [0001] The invention belongs to the field of high-voltage insulating materials, and in particular relates to a heat treatment method for increasing the dielectric constant of an insulating medium. Background technique [0002] With the continuous increase of energy demand and the continuous consumption of fossil fuels, the utilization and storage of new energy sources such as solar energy and wind energy are becoming more and more important. However, due to the randomness, intermittency and volatility caused by natural factors, the utilization of new energy is unstable, which affects the safety and stable operation of the power grid. In order to ensure power supply stability and power quality, energy storage, as a key technology for new energy utilization, is playing an increasingly important role. Compared with electrochemical energy storage methods, dielectric energy storage has gradually become the focus of research because of its advantages such as fast ...

Claims

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Application Information

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IPC IPC(8): B29C41/02B29C71/02H01B19/00C08G75/00B29L7/00
CPCB29C41/003B29C41/02B29C71/02B29C2071/025B29L2007/002C08G75/00H01B19/00
Inventor 冯阳李盛涛杨安琪杨柳青
Owner XI AN JIAOTONG UNIV
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