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Preparation method of aluminium foil bionic nanostructured super-hydrophobic anti-condensation functional surface

A bionic nano, super-hydrophobic technology, applied in surface reaction electrolytic coating, anodizing, electrolytic coating, etc., can solve the problems of high surface energy of hydrophilic foil, lower thermal conductivity of aluminum foil, easy adsorption of pollutants, etc. The effect of easy control, reduced corrosion, and simple preparation process

Inactive Publication Date: 2012-02-08
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydrophilic aluminum foil still has the following limitations: (1) The hydrophilic coating is generally a pure organic coating material, with a thickness of up to several microns, which reduces the thermal conductivity of the original aluminum foil; (2) the surface of the hydrophilic foil The water film is not easy to slide off, which increases the thermal resistance of the coating; (3) The surface energy of the hydrophilic foil is high, and the existence of the "wet" water film makes it easy to corrode and absorb pollutants
There is no report on the construction of close-packed nanosphere structures on the surface of aluminum foil

Method used

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  • Preparation method of aluminium foil bionic nanostructured super-hydrophobic anti-condensation functional surface
  • Preparation method of aluminium foil bionic nanostructured super-hydrophobic anti-condensation functional surface
  • Preparation method of aluminium foil bionic nanostructured super-hydrophobic anti-condensation functional surface

Examples

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Effect test

example 1

[0029] (1) Clean the 0.04mm thick aluminum foil (30mm*30mm, aluminum element content is 99.5%) with acetone and deionized water ultrasonically and blow dry, then immerse in 1mol / L NaOH aqueous solution for about 30-60s, In this example, the treatment time is 40s to remove the oxide film on the surface of the aluminum foil.

[0030] (2) Use the mixed aqueous solution of phosphoric acid and glycerol as the electrolyte, use the nickel sheet as the cathode, and use the aluminum foil as the anode. The two poles are placed in parallel and facing each other, with an area ratio of 1:1 and a distance of 20 mm. Under room temperature and constant current mode For anodizing, the current density is 3.2mA / cm 2 , oxidation time 120min. After the anodic oxidation is finished, take out the aluminum foil, wash and dry with ethanol and deionized water, and the mixed aqueous solution of phosphoric acid and glycerol is prepared by the following method: add analytically pure phosphoric acid and g...

example 2

[0034] (1) Clean the 0.04mm thick aluminum foil (30mm*30mm, aluminum element content is 99.5%) with acetone and deionized water ultrasonically and blow dry, then immerse in 1mol / L NaOH aqueous solution for about 30-60s, In this example, the treatment time is 60s to remove the oxide film on the surface of the aluminum foil.

[0035] (2) Use the mixed aqueous solution of phosphoric acid and glycerol as the electrolyte, use the nickel sheet as the cathode, and use the aluminum foil as the anode. The two poles are placed in parallel and facing each other, with an area ratio of 1:1 and a distance of 20 mm. Under room temperature and constant current mode For anodizing, the current density is 4.8mA / cm 2 , oxidation time 150min. After the anodic oxidation is finished, take out the aluminum foil, wash and dry with ethanol and deionized water, and the mixed aqueous solution of phosphoric acid and glycerol is prepared by the following method: add analytically pure phosphoric acid and g...

example 3

[0039] (1) Clean the 0.04mm thick aluminum foil (30mm*30mm, aluminum element content is 99.5%) with acetone and deionized water ultrasonically and blow dry, then immerse in 1mol / L NaOH aqueous solution for about 30-60s, In this example, the treatment time is 30s to remove the oxide film on the surface of the aluminum foil.

[0040] (2) Use the mixed aqueous solution of phosphoric acid and glycerol as the electrolyte, use the nickel sheet as the cathode, and use the aluminum foil as the anode. The two poles are placed in parallel and facing each other, with an area ratio of 1:1 and a distance of 20 mm. Under room temperature and constant current mode For anodizing, the current density is 4.2mA / cm 2 , oxidation time 130min. After the anodic oxidation is finished, take out the aluminum foil, wash and dry with ethanol and deionized water, and the mixed aqueous solution of phosphoric acid and glycerol is prepared by the following method: add analytically pure phosphoric acid and g...

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Abstract

The invention relates to a treatment method of an aluminium foil bionic nanostructured super-hydrophobic anti-condensation functional surface. The method comprises the following steps: firstly performing ultrasonic cleaning of an aluminium foil with acetone and deionized water, blowing to dry, soaking the aluminium foil into a 1 mol / L NaOH aqueous solution for treatment for 30-60 s, cleaning with ethanol and deionized water in order, blowing to dry so as to keep in reserve; soaking the pretreated aluminium foil in liquid which adopts a mixed aqueous solution of phosphoric acid and glycerol as an electrolyte, performing anodization under a room-temperature condition in a constant current density mode for 120-150 min; after the anodization is completed, taking the aluminium foil out, cleaning with ethanol and deionized water, blowing to dry; soaking the anodized aluminium foil in liquid stearic acid at 70 DEG C for 1 h, rinsing in hot ethanol with a temperature of 70 DEG C, curing in an oven with a temperature of 80 DEG C for 30 min so as to prepare the aluminium foil bionic nanostructured super-hydrophobic anti-condensation functional surface. The invention has a simple preparation process, no pollution, less substrate damage, excellent surface quality, and is applicable to popularization and application.

Description

technical field [0001] The invention relates to a treatment method for an aluminum foil bionic nanostructure superhydrophobic anti-condensation functional surface. Background technique [0002] Aluminum foil has the advantages of light weight, easy processing, good thermal conductivity, and low price. It is the main material for air-conditioning heat exchangers (including evaporators and condensers). For the light foil without surface treatment, when the surface temperature is lower than the dew point of the ambient air during cooling, condensation on the aluminum foil will occur, causing problems such as water bridges, white powder, and peculiar smell. This not only reduces the heat transfer performance and service life of the machine, but also increases energy consumption, and at the same time brings pollution to the indoor environment and endangers human health. In addition, condensation is also prone to condensation on the surface of pipes, cold radiant panels, air outl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/08C25D11/24
Inventor 张友法余新泉吴昊陈锋
Owner SOUTHEAST UNIV
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