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Preparation method of polyetherimide coated magnesium oxide/polypropylene nano composite film

A polyetherimide and nanocomposite technology, which is applied in the field of polymer nanocomposite dielectric preparation, can solve the problems of limiting the energy storage performance of polypropylene nanocomposite dielectrics, the reduction of breakdown strength of nanocomposite dielectrics, and the difference in dielectric properties. Achieve the effect of controllable film thickness, increase dielectric constant and breakdown field strength, and reduce thickness error

Active Publication Date: 2022-04-19
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large difference in dielectric properties between the nanofiller and the polymer matrix, the breakdown strength of the nanocomposite dielectric is reduced. Dielectric constant increased to 15.4, but at the expense of breakdown field strength
This severely limits the improvement of the energy storage performance of polypropylene nanocomposite dielectrics

Method used

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  • Preparation method of polyetherimide coated magnesium oxide/polypropylene nano composite film
  • Preparation method of polyetherimide coated magnesium oxide/polypropylene nano composite film
  • Preparation method of polyetherimide coated magnesium oxide/polypropylene nano composite film

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preparation example Construction

[0053] The preparation method of polyetherimide coated magnesium oxide / polypropylene nanocomposite film comprises the following steps:

[0054] Step 1. Using 30% hydrogen peroxide to treat the surface of magnesium oxide nanoparticles to introduce more hydroxyl groups to obtain hydroxylated magnesium oxide nanoparticles.

[0055] Step 2: Selecting a silane coupling agent to perform surface amination treatment on the hydroxylated magnesium oxide nanoparticles, forming amino groups on the surface of the hydroxylated magnesium oxide nanoparticles, and obtaining aminated magnesium oxide nanoparticles.

[0056] Step 3, with the aid of the amino group on the surface of the magnesium oxide nanoparticles, the bisphenol A diether dianhydride (BPADA) monomer is connected to the surface of the aminated magnesium oxide nanoparticles, m-phenylenediamine (mPDA) is added, and the magnesium oxide nanoparticle The mass ratio of particles, BPADA, and mPDA is 1g: 1.6942g: 0.3402g, and the polyeth...

Embodiment 1

[0085] A preparation method of high breakdown strength polyetherimide coated magnesium oxide / polypropylene nanocomposite dielectric film, the specific steps are as follows:

[0086] Step 1. Hydroxylation of nanoparticles

[0087] 1.1) Dry the magnesium oxide nanoparticles in a vacuum oven at 80°C for 12 hours;

[0088] 1.2) Put 2.5g of dried nanoparticles in a 150ml single-necked flask A, add 40ml of 30% hydrogen peroxide, and ultrasonically disperse for 30min to form a suspension;

[0089] 1.3) Raise the temperature of the suspension from 40°C to 10°C every 10 minutes, stepwise increase the temperature to 80°C, install a 300ml serpentine condenser tube to condense and reflux, and react for more than 6 hours;

[0090] 1.4) After the reaction, centrifuge the suspension for 10 minutes at a speed of 6000 r / min, wash with hydrogen peroxide for 3 times, each time for 5 minutes, and dry the precipitate in a vacuum oven at 80°C for 12 hours to obtain hydroxylated magnesium oxide Na...

Embodiment 2

[0112] A preparation method of high breakdown strength polyetherimide coated magnesium oxide / polypropylene nanocomposite dielectric film, the steps are as follows:

[0113] Step 1, using 30% hydrogen peroxide to carry out surface hydroxylation treatment on magnesium oxide nanoparticles.

[0114] Step 2. Select KH550 silane coupling agent to carry out surface amination treatment on the hydroxylated magnesium oxide nanoparticles.

[0115] Step 3, with the help of amino groups on the surface of magnesium oxide nanoparticles, the BPADA monomer is connected to the surface of magnesium oxide nanoparticles, mPDA is added, and the polyetherimide coating layer on the surface of magnesium oxide nanoparticles is formed by in-situ polymerization to obtain poly MgO nanoparticles coated with etherimide.

[0116] Step 4, the solution blending method is mixed with 0.030g of polyetherimide-coated magnesium oxide nanoparticles into 3g of polypropylene matrix, and the solvent is evaporated with...

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Abstract

The invention discloses a preparation method of a polyetherimide coated magnesium oxide / polypropylene nano composite film, which comprises the following steps: firstly, coating an organic matter layer on the surface of inorganic nanoparticles to form a transition layer, thereby weakening the reduction of the breakdown strength of a nano composite dielectric medium caused by larger dielectric property difference between a nano filler and a polymer matrix; and a new thought is provided for synergistically improving the dielectric constant and the breakdown field strength so as to maximize the energy density of the polymer film.

Description

technical field [0001] The invention belongs to the field of polymer nanocomposite dielectric preparation, in particular to a method for preparing a polyetherimide-coated magnesium oxide / polypropylene nanocomposite film with high breakdown strength. Background technique [0002] Energy is the key factor for the survival and development of human beings. Non-renewable energy such as fossil energy cannot be used for a long time due to its non-renewability and harmfulness to the environment. Today's global energy landscape has undergone profound changes, and the utilization of clean energy has gradually become a hot spot of concern. However, the utilization of wind energy and solar energy is relatively difficult and inefficient. At present, photovoltaic and wind power generation can convert two clean energy sources into electric energy, but they are limited by the instability and discontinuity of solar energy and wind energy. In order to ensure the stability of the power grid, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08K3/22C08K9/10C08K9/02C08K9/06C08J5/18C08G73/10
CPCC08J5/18C08G73/1028C08G73/1053C08J2323/12C08K2003/222C08K9/10C08K9/02C08K9/06C08K2201/011
Inventor 闵道敏韩梦瑶李沁蓉武庆周王威望李盛涛
Owner XI AN JIAOTONG UNIV
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