Nano coating for inhibiting surface charge accumulation of epoxy resin and preparation method

A technology of nano-coating and epoxy resin, applied in the direction of coating, etc., can solve the problems of corroding metal, changing chemical composition, corrosion, etc., and achieve the effect of increasing DC flashover voltage, reducing surface charge accumulation, and easy migration

Inactive Publication Date: 2019-03-01
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are three obvious disadvantages: first, fluorine gas is a highly toxic gas that can irritate the eyes, skin, and mucous membranes of the respiratory tract. It requires special protective facilities in industrial production applications, and special protection is required for the storage and transportation of fluorine gas. Increased cost; Second, fluorine gas not only reacts with insulators (epoxy resin materials), but also reacts with metals and corrodes metals, so it is inevitable to react with the flanges and inserts of insulators and corrode them during processing The third is that this chemical treatment method changes the chemical composition of the insulator surface, which will accelerate the aging of the insulator surface, and its long-term stability remains to be investigated
Second, no matter what kind of discharge form, it is difficult to achieve uniform discharge and uniform treatment
Therefore, the concept is not at all suitable for large-scale industrial applications

Method used

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  • Nano coating for inhibiting surface charge accumulation of epoxy resin and preparation method
  • Nano coating for inhibiting surface charge accumulation of epoxy resin and preparation method
  • Nano coating for inhibiting surface charge accumulation of epoxy resin and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for preparing a nano-coating dipping solution, comprising the following steps:

[0038] S1. Weigh MMT10g, disperse in 990g deionized water to form a suspension with a mass concentration of 1wt%, then stir at high speed for 5min, and use ultrasonic treatment for 15min;

[0039] S2. Add 6.67g PVA and deionized water to the suspension prepared in step S1, so that the PVA quality accounts for 40wt% of the total solid mass of PVA and MMT, and the total solid mass fraction in the solution is 1wt%, and the mixture is placed in a water bath , heated up to 90°C while stirring, and ultrasonically dispersed again for 15 minutes;

[0040] S3. After the PVA is completely dissolved, add 0.76g of the crosslinking agent GA, so that the ratio of the number of moles of GA to the total number of hydroxyl groups on the PVA chain is 1:20, and add 0.06g of catalyst HCl for the crosslinking reaction, and the number of moles of catalyst HCl The molar ratio of GA to GA is 1:5, and ult...

Embodiment 2

[0042] S1. Weigh MMT10g, disperse in 990g deionized water to form a suspension with a mass concentration of 1wt%, then stir at high speed for 8min, and use ultrasonic treatment for 20min;

[0043] S2. add 10g PVA and deionized water to the suspension prepared in step S1, make the PVA quality account for 50wt% of the total solid mass of PVA and MMT, the total solid mass fraction in the solution is 1wt%, the mixture is placed in a water bath, Raise the temperature to 90°C while stirring, and ultrasonically disperse again for 20 minutes;

[0044]S3. After the PVA is completely dissolved, add 1.14g of cross-linking agent GA, so that the ratio of the number of moles of GA to the total number of moles of hydroxyl groups on the PVA chain is 1:20, and add 0.06g of catalyst HCl for cross-linking reaction, and the number of moles of catalyst HCl The molar ratio of GA to GA is 1:5, and ultrasonication is performed for 20 minutes at a constant temperature to form a uniform and transparent...

Embodiment 3

[0046] S1. Weigh MMT10g, disperse in 990g deionized water to form a suspension with a mass concentration of 1wt%, then stir at high speed for 10min, and use ultrasonic treatment for 30min;

[0047] S2. add 12g PVA and deionized water to the suspension prepared in step S1, make the PVA quality account for 60wt% of the total solid mass of PVA and MMT, the total solid mass fraction in the solution is 2wt%, the mixture is placed in a water bath, Raise the temperature to 90°C while stirring, and ultrasonically disperse again for 30 minutes;

[0048] S3. After the PVA is completely dissolved, add 1.368g of cross-linking agent GA, so that the ratio of the number of moles of GA to the total number of moles of hydroxyl groups on the PVA chain is 1:20, and add 0.06g of catalyst HCl for the cross-linking reaction, and the number of moles of catalyst HCl The molar ratio of GA to GA is 1:5, and ultrasonication is performed for 30 minutes at a constant temperature to form a uniform and tran...

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Abstract

The invention discloses a nano coating for inhibiting surface charge accumulation of epoxy resin and a preparation method. The preparation method comprises the following steps that S1, MMT is weighedand dispersed in deionized water to form a suspension with a mass concentration of 1wt%; S2, PVA and deionized water are added to the suspension prepared in step S1 to enable the PVA mass to account for 40wt%-60wt% of the total solid mass of the PVA and the MMT, and the total solid mass fraction in the solution is 1wt%-2wt%; S3, after complete dissolution of the PVA, a cross-linking agent GA is added, and ultrasonic treatment is performed for 15-30 min under the constant temperature to form a PVA/MMT dispersion system; S4, epoxy resin insulators are treated in the plasmas for 4-8 minutes; andS5, the epoxy resin insulators are vertically immersed into the immersion liquid PVA/MMT dispersion system, and a PVA/MMT two-dimensional nano coating is formed. The coating has a special nano-scale layer structure, can reduce the surface trap level of the epoxy resin insulators from 1.02eV to 0.86eV, and facilitates evacuation of charge carriers along the surface of parallel organic silicate crystal sheet layers; and the surface charge accumulation of the insulators can be reduced, so that the direct current flashover voltage is increased by about 20%.

Description

technical field [0001] The invention relates to the field of insulation technology, in particular to a nano-coating for suppressing the accumulation of charges on the surface of epoxy resin and a preparation method thereof. Background technique [0002] Under DC voltage, the problem of charge accumulation on the surface of the insulator is the cause of the drop in the flashover voltage of the insulator, so it is necessary to solve the problem of charge accumulation. At present, there are two main methods of material modification proposed by researchers to suppress surface charge accumulation, one is surface fluorination treatment and the other is plasma treatment. [0003] Surface fluorination treatment is to use the strong oxidation of fluorine gas to directly fluorinate the surface of insulating materials to form a strong carbon-fluorine (C-F) surface layer organically combined with the substrate. By changing the physical and chemical structure of the material surface, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D129/04C09D7/61C08J7/04C08L63/00
CPCC08J7/0427C08J2363/00C09D7/61C09D7/70C09D129/04
Inventor 张博雅侯易岑张贵新
Owner XI AN JIAOTONG UNIV
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