Novel method for preparing nanoparticle/polyimide three-layer composite film

A technology for the preparation of nanoparticles and thin films, which can be used in coatings, filament/wire forming, non-woven fabrics, etc., and can solve problems such as mechanical property degradation

Inactive Publication Date: 2016-11-09
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The study found that the use of nanoparticles to modify the polyimide film can significantly improve the corona resistance of the film. Therefore, how to improve the corona resistance of polyimide film and prevent the decline of its mechanical properties has become the key to expand the application field of polyimide film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A new method for preparing a nanoparticle / polyimide three-layer composite film, the method comprising the steps of:

[0021] (1) Preparation of biphenyl polyamic acid;

[0022] (2) Preparation of polyamic acid microporous membrane by electrospinning;

[0023] (3) Preparation of homo-phenylene polyamic acid doped with nanoparticles;

[0024] (4) Coating nanoparticle-doped polyamic acid on both sides of the microporous membrane;

[0025] (5) Thermal imidization of nanoparticle / polyamic acid three-layer composite film.

Embodiment 2

[0027] According to the new method for the preparation of the nanoparticle / polyimide three-layer composite film described in Example 1, for the preparation of the described biphenyl type polyamic acid, take 2.80g of 4,4-diaminodiphenyl ether and pour into a three-necked flask, add 29.6ml of N,N-dimethylacetamide, pass through nitrogen for protection, stir in a cold water bath at 10°C for 1 h, and add 4.23g of 3,3',4,4'-biphenyl tetra Formic acid dianhydride was gradually added to the solution in batches, and the feeding time was controlled at 120 minutes. After the rod climbing phenomenon appeared, the stirring was continued for 24 hours, and the transparent yellow viscous polyamic acid liquid was poured into a small beaker and sealed for later use.

Embodiment 3

[0029] According to the new method for preparing the nanoparticle / polyimide three-layer composite film described in embodiment 1 or 2, the described electrospinning method prepares the polyamic acid microporous membrane, and takes 10ml of the described biphenyl polyamide The acid liquid was placed in the syringe pump of the electrospinning device, the spinning voltage was adjusted to 10 kV, the injection speed was 0.3 ml / h, the receiving distance was 15 cm, and the polyamic acid microporous membrane with a thickness of 20 μm was prepared by spinning for 5 h.

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Abstract

The invention relates to a novel method for preparing a nanoparticle / polyimide three-layer composite film. By using the nanoparticles to modify the polyimide film, the corona resistance of the film can be obviously enhanced, but the mechanical properties of the polyimide film are correspondingly lowered as the doping amount of the nanoparticles continuously increases. The method comprises the following steps: (1) preparing biphenyl type polyamic acid; (2) preparing a polyamic acid microporous film by electrostatic spinning; (3) preparing nanoparticle-doped pyromellitic polyamic acid; (4) applying the nanoparticle-doped polyamic acid on both sides of the microporous film; and (5) carrying out hot imidization on the nanoparticle / polyamic acid three-layer composite film. The invention discloses a novel method for preparing a nanoparticle / polyimide three-layer composite film.

Description

Technical field: [0001] The invention relates to a new method for preparing a nanoparticle / polyimide three-layer composite film. Background technique: [0002] Polyimide film is one of the earliest products of polyimide. Polyimide film is the organic film with the best heat resistance at present. It can maintain its physical properties in a short period of time at 555°C, and the long-term use temperature can reach above 200°C. , mainly used for slot insulation of motors and coating materials for wires and cables. Moreover, the electrical properties, radiation resistance and fire resistance of polyimide films are also very outstanding, and they play a very important role in the aerospace industry, electrical and electronic industry and information industry. However, because polyimide itself is a high molecular polymer, its corona resistance is poor, which limits its application in the fields of high-voltage generators, high-voltage motors, and variable frequency motors power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/04C09D179/08C09D7/12C08G73/10D01D5/00D04H3/009D04H3/02
CPCC08G73/1007C08G73/1071C08J7/0427C08J2379/08C08J2479/08C09D7/40C09D179/08D01D5/0015D04H3/009D04H3/02
Inventor 巩桂芬王磊
Owner HARBIN UNIV OF SCI & TECH
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