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Dispersion measurement method of inorganic nano-particle composite polyimide film raw material

A technology of compounding polyimide and inorganic nanoparticles, which is applied in the direction of analyzing materials and instruments to achieve accurate results, simple experimental equipment, and intuitive experimental results

Active Publication Date: 2012-07-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0055] The purpose of the present invention is to provide a method for detecting the dispersion of inorganic nanoparticle composite polyimide film raw materials, which overcomes the shortcomings of the existing inorganic nanoparticle dispersion detection method

Method used

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  • Dispersion measurement method of inorganic nano-particle composite polyimide film raw material
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  • Dispersion measurement method of inorganic nano-particle composite polyimide film raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] Embodiment 1 (determine standard voltage test sample)

[0087] (1) Nanocomposite polyimide films were prepared in the laboratory. During the preparation process, the nanoparticles are treated with a surface treatment agent to improve their dispersibility, and ultrasonic and mechanical blending methods are used in the dispersion process of the nanoparticles to fully disperse the nanoparticles. Divide the prepared inorganic nanometer / polyamic acid solution into two parts, one part is film imidized to make a finished film, and the finished product is imaged by a scanning electron microscope to confirm its dispersion. If the dispersion is good, another part of the inorganic nanometer / Polyamic acid solution as a standard voltage test sample.

[0088] (2) Pour the raw material of the polyimide film to be tested into the detection device shown in the figure, fill the container full, and remove air bubbles in a vacuum environment, and then put a metal plate electrode into the...

Embodiment 2

[0092] (1) The nanocomposite polyimide film is prepared in the laboratory. During the preparation process, the surface of the nanoparticle is not treated. The nanoparticle is dispersed by a pure mechanical dispersion method, and the raw material of the prepared nanocomposite polyimide film is quantified as a test. sample. The method is the same as in Example 1, and the standard value is 4.14kV in Example 1.

[0093] (2) Pour the raw material of the polyimide film to be tested into the detection device shown in the figure, fill the container full, and remove air bubbles in a vacuum environment, and then put a metal plate electrode into the sample;

[0094] (3) Connect the circuit according to the circuit shown in the schematic diagram, apply 0-10kV AC voltage to the two plates, increase the voltage amplitude at a rate of 0.5kV / s, until the polyimide film material between the plates discharges and breaks down, record this When the breakdown voltage is 3.1kV;

[0095] (4) Compa...

Embodiment 3

[0097] (1) The raw material of nanocomposite polyimide film in the actual industrial production process is taken as the detection cost. The standard value is still 4.14kV of Example 1.

[0098] (2) Pour the raw material of the polyimide film to be tested into the detection device shown in the figure, fill the container full, and remove air bubbles in a vacuum environment, and then put a metal plate electrode into the sample;

[0099] (3) Connect the circuit according to the circuit shown in the schematic diagram, apply 0-10kV AC voltage to the two plates, increase the voltage amplitude at a rate of 0.5kV / s, until the polyimide film material between the plates discharges and breaks down, record this When the breakdown voltage is 4.0kV;

[0100] (4) Comparing the detected value of breakdown voltage in step (3) with the standard value of 4.14kV in step 1, it is found that it is close to the standard value, and the difference is within 5%. It is determined that the sample has goo...

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Abstract

The invention relates to a dispersion measurement method of an inorganic nano-particle composite polyimide film raw material, comprising the following steps of: (1) placing a proper amount of a sample into a measurement container and then placing a metal plate electrode into the measurement container; (2) applying an alternative current voltage on two electrode plates, gradually increasing the voltage amplitude and recording a breakdown voltage measurement value; ( 3) comparing the measurement value with the standard value and analyzing; and (4) analyzing the measurement result, wherein the closer the measurement value and the standard value are, the more uniform the dispersion of the nano particles in the sample is. The time is saved, the dispersion is directly measured free from the limit of various dispersion stability mechanisms, the experiment device is simple, the measurement operation is convenient, and the experiment result is visual and accurate. The dispersion measurement method is mainly used in the technical field of the electronic insulation.

Description

technical field [0001] The invention relates to a method for detecting the dispersion of inorganic nanoparticles, more precisely to a method for detecting the dispersion of inorganic nanoparticles composite polyimide film raw materials, which belongs to the technical field of electrical insulation. Background technique [0002] In recent years, the scope of use of variable frequency motors has become wider and wider. The advantages of high efficiency, energy saving, and easy control make variable frequency motors have a tendency to replace DC speed regulation in the fields of metallurgy, lifting, and locomotive traction. Especially since the advent of insulated gate bipolar transistors (IGBTs), the carrier frequency has changed from bipolar transistors (GTR ) from about 1-2K to about 10-20K, which has brought outstanding problems to the insulation of the motor. A large number of instantaneous pulse peak voltages are applied to the inter-turn (especially the first turn) insu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/00
Inventor 杜伯学李杰胡文佳刘勇高宇
Owner TIANJIN UNIV
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