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Nanowire-fluorocarbon composite coating and preparation method thereof

A technology of composite coating and fluorocarbon coating, which is applied in the direction of coating, nanotechnology, nanotechnology, etc., can solve the problems of inability to arrange heat transfer channels, decrease of binding force, unfavorable droplet condensation, etc., to improve effective heat conduction Coefficient, prevent the accumulation of dust and dirt, solve the effect of poor thermal conductivity

Active Publication Date: 2021-04-16
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the blending method is used, the nanoparticles are randomly dispersed in the coating, and cannot be arranged along the heat flow direction to form an effective heat transfer channel.
Moreover, when the filler content increases to a certain value, it will greatly affect the curing and film-forming properties of the coating, resulting in a decrease in the binding force from level 0 to level 1-2; and the added high surface energy particles will reduce the hydrophobicity of the fluorocarbon coating. Sex, not conducive to the occurrence of droplet condensation

Method used

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  • Nanowire-fluorocarbon composite coating and preparation method thereof
  • Nanowire-fluorocarbon composite coating and preparation method thereof
  • Nanowire-fluorocarbon composite coating and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0058] The technical scheme of the present invention is: firstly use the electrochemical deposition method to grow copper nanowires of a certain height on the surface of the metal substrate, then adjust the viscosity of the coating, and use an appropriate spraying process to form a film in the gaps of the nanowires. It solves the problem of poor heat transfer performance while condensing. The specific process is as follows:

[0059] 1. Substrate pretreatment: Use 800# and 3000# sandpaper to polish the copper substrate (copper substrate) sequentially, and polish the surface of the copper substrate. The polished substrate (copper substrate) was ultrasonically cleaned with acetone and ethanol, respectively, and then rinsed with deionized water.

[0060] 2. Electroplating nanowires: Place the copper substrate, porous alumina (PAA) template, filter paper, and copper sheet connected to the counter electrode in order and fix them with clips, and immerse the edge of the filter paper ...

Embodiment 2

[0067]Construct the surface of 1# nanowire, and spray PFA to prepare 3# nanowire-PFA composite coating. The preparation steps are as follows: polish the copper substrate with 800# and 3000# sandpaper in sequence, and polish the substrate surface well. The polished substrates were ultrasonically cleaned with acetone and ethanol, respectively, and then rinsed with deionized water. Place the porous alumina (PAA) template (model 450-200), the filter paper and the counter electrode of the copper sheet in order and fix them with clips, and dip the edge of the filter paper into the electroplating solution to ensure that the solution can be completely absorbed by the filter paper through capillary action , and evenly distributed in the PAA template. A constant potential was applied between the copper substrate and the counter electrode to plate the nanowires. After electroplating for 1100 s, a layer of short copper nanowire arrays was attached to the copper substrate. After that, re...

Embodiment 3

[0069] Construct 2# nanowire surface, and spray PFA to prepare nanowire-PFA composite surface, this embodiment differs from embodiment 1 in that the type of template used is changed, i.e. the distance between nanowires, the preparation steps are as follows: use 800# and 3000# sandpaper grinds the copper substrate in turn to polish the surface of the substrate well. The polished substrates were ultrasonically cleaned with acetone and ethanol, respectively, and then rinsed with deionized water. Place the porous alumina (PAA) template (model 450-110), the filter paper and the counter electrode of the copper sheet in sequence and fix them with clips, and dip the edge of the filter paper into the electroplating solution to ensure that the solution can be completely absorbed by the filter paper through capillary action , and evenly distributed in the PAA template. A constant potential was applied between the copper substrate and the counter electrode to plate the nanowires. After ...

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Abstract

The invention provides a nanowire-fluorocarbon composite coating and a preparation method thereof. According to the method, a directionally-arranged high-thermal-conductivity nanowire network is introduced into a traditional fluorocarbon coating, so that the nanowire-fluorocarbon composite coating is prepared. The prepared composite coating can remarkably improve the effective heat conduction performance of a fluorocarbon coating by 150 times or above to the maximum extent, meanwhile, the bonding strength of the coating and a substrate can reach the zero level, the surface contact angle is increased to about 152 degrees, the problems that a traditional heat exchanger coating is poor in heat conduction, short in service life, prone to dust accumulation and the like can be effectively solved, and the composite coating can be used for power generation, petrochemical engineering, seawater desalination and other industrial processes.

Description

technical field [0001] The invention relates to the technical field of functional material surface and enhanced heat transfer, in particular, to a nanowire-fluorocarbon composite coating and a preparation method thereof. In particular: the use of high thermal conductivity materials to modify fluorocarbon coatings to prepare composite coatings can improve the effective thermal conductivity and hydrophobic properties of the coating and the bonding force with the substrate, thereby improving the heat transfer performance and accumulation resistance of the heat exchanger gray performance. Background technique [0002] At present, in petrochemical, power generation, refrigeration and many other fields, heat exchangers are indispensable equipment. However, in the application process, the condensation mode of most equipment is film condensation, and the formed thick liquid film greatly affects the heat transfer performance. In addition, after the heat exchanger has been in operat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D5/00B05D7/14B05D7/24B05D1/02B05D3/02C25D1/00B82Y40/00B82Y30/00
Inventor 马学虎李启迅杜宾港刘渊博温荣福兰忠
Owner DALIAN UNIV OF TECH
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