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Dielectric medium multifunctional nano coating as well as preparation method and application thereof

A nano-coating, multi-functional technology, applied in the direction of coating, can solve problems such as single performance, achieve quick results, suitable for large-scale production applications, and convenient spraying applications.

Active Publication Date: 2022-04-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current surface coating method has the following defects: single performance

Method used

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  • Dielectric medium multifunctional nano coating as well as preparation method and application thereof
  • Dielectric medium multifunctional nano coating as well as preparation method and application thereof
  • Dielectric medium multifunctional nano coating as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Such as figure 1 As shown, this embodiment includes the following steps:

[0043] (1) Weigh 1.88g of PDMS prepolymer and place it in 80mL of n-hexane with electric stirring at 500rad / min at room temperature to form a uniform solution;

[0044] (2), weigh 0.28g (r SiO2 = 15%) SiO 2 nanoparticles and 0.01g(r CNT =0.5%) MWCNTs, placed in the solution of step (1), stirred at 500 rad / min for 10 min at room temperature, and ultrasonically treated at 40 kHz for 20 min to form a suspension. Among them, r SiO2 and r CNT represent SiO 2 Mass ratio of nanoparticles and MWCNTs to PDMS prepolymer.

[0045] (3) Add 0.19 g of PDMS curing agent to the solution, and continue ultrasonic treatment at a frequency of 40 kHz for 10 min.

[0046] (4) Epoxy resin is selected as the matrix, and the surface is pretreated with abrasive paper (1000Cw) to improve the adhesion strength, and the surface is wiped clean with alcohol.

[0047] (5), spray nano-coating: spray gun pressure 40psi, ...

Embodiment 2

[0051] This embodiment includes the following steps:

[0052] (1) Weigh 1.88g of PDMS prepolymer and place it in 80mL of n-hexane with electric stirring at 500rad / min at room temperature to form a uniform solution;

[0053] (2), weigh 0.47g (r ZnO =25%) ZnO nanoparticles and 0.01g (r CNT =0.5%) MWCNTs, placed in the solution of step 1, stirred at 500 rad / min for 10 min at room temperature, and ultrasonically treated at 40 kHz for 20 min to form a suspension.

[0054] (3) Add 0.19 g of PDMS curing agent to the solution, and continue ultrasonic treatment at a frequency of 40 kHz for 10 min.

[0055] (4) Epoxy resin is selected as the matrix, and the surface is pretreated with abrasive paper (1000Cw) to improve the adhesion strength, and the surface is wiped clean with alcohol.

[0056] (5), spray nano-coating: spray gun pressure 40psi, the distance between substrate and spray gun 150mm and spraying angle 90 °, balance the solvent evaporation time in the spraying process. The...

Embodiment 3

[0060] This embodiment includes the following steps:

[0061] (1) Weigh 1.88g of PDMS prepolymer and place it in 80mL of n-hexane with electric stirring at 500rad / min at room temperature to form a uniform solution;

[0062] (2), weigh 0.47g (r ZnO =25%) ZnO nanoparticles, placed in the solution of step 1, stirred at 500 rad / min for 10 min at room temperature, and ultrasonically treated at 40 kHz for 20 min to form a suspension.

[0063] (3) Add 0.19 g of PDMS curing agent to the solution, and continue ultrasonic treatment at a frequency of 40 kHz for 10 min.

[0064] (4) Epoxy resin is selected as the matrix, and the surface is pretreated with abrasive paper (1000Cw) to improve the adhesion strength, and the surface is wiped clean with alcohol.

[0065] (5), spray nano-coating: spray gun pressure 40psi, the distance between substrate and spray gun 150mm and spraying angle 90 °, balance the solvent evaporation time in the spraying process. The needle size and flow rate of th...

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Abstract

The invention provides a multifunctional dielectric nano coating as well as a preparation method and application thereof. The method comprises the following steps: weighing a polydimethylsiloxane prepolymer, placing the polydimethylsiloxane prepolymer in n-hexane, and electrically stirring at room temperature to form a uniform solution; weighing nano-particles and multi-walled carbon nanotubes, putting the nano-particles and the multi-walled carbon nanotubes into the solution, stirring at normal temperature, and performing ultrasonic treatment for a certain time to finally form suspension liquid; adding a PDMS curing agent into the solution, and continuously carrying out ultrasonic treatment for a period of time; the surface of the substrate is pretreated with abrasive paper; spraying a nano coating: spraying the prepared solution on a substrate; curing the coated sample in a vacuum box at 100 DEG C for 4 hours; and changing the mass percent of the nano-particles, and repeating the steps to prepare the required nano-coatings with various concentration gradients. The direct current flashover strength, the super-hydrophobic surface, the self-cleaning capacity and the anti-icing performance of the coating are all optimized.

Description

technical field [0001] The invention relates to the technical fields of materials and electrical engineering, in particular to a dielectric multifunctional nano-coating and its preparation method and application. Background technique [0002] Polymers have the advantages of high breakdown strength and light weight, and are commonly used as dielectric materials in power systems, electronic devices, pulse power devices, and spacecraft. The interface between different media such as gas / vacuum solid is the weak link in the insulation system, that is, surface flashover is more likely to occur than bulk breakdown. Especially in high-voltage direct current (HVDC) transmission systems, insulators have the problem of surface charge accumulation under DC stress, which distorts the local electric field and promotes flashover at the medium interface. In addition, the increase of moisture or water droplets attached to the surface of the medium may further deteriorate the flashover stren...

Claims

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Application Information

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IPC IPC(8): C09D183/04C09D7/61
Inventor 朱明晓陈廷鑫李孟陶
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)