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Preparing method for aluminum surface super-hydrophobic coating with micro-nano composite structure

A technology of micro-nano composite structure and super-hydrophobic coating, which is applied in the direction of surface-coating liquid devices, coatings, special surfaces, etc., which can solve the problem of affecting the heating effect of air conditioners, reducing the heat exchange efficiency of condensers, and ventilation of heat sinks Channel blockage and other problems, to achieve the effect of excellent hydrophobicity, anti-icing performance, and easy availability of raw materials

Inactive Publication Date: 2016-06-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The air conditioner heats up in a low-temperature environment. Since the outdoor unit is placed outdoors, the moisture in the outdoor air will frost on the cooling fins of the condenser. Ice crystals will accumulate for a long time and form ice, which will easily block the ventilation channels of the cooling fins and cause the condenser to be replaced. Thermal efficiency decreases, affecting the entire heating effect of the air conditioner

Method used

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  • Preparing method for aluminum surface super-hydrophobic coating with micro-nano composite structure
  • Preparing method for aluminum surface super-hydrophobic coating with micro-nano composite structure
  • Preparing method for aluminum surface super-hydrophobic coating with micro-nano composite structure

Examples

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Effect test

example 1

[0029] 1. Ultrasonic clean the aluminum sheet with acetone and toluene for 10 minutes, then wash it with distilled water to remove the oil on the surface of the aluminum sheet, and dry it in an oven at 100°C.

[0030] 2. Put the clean aluminum sheet into 3mol / L hydrochloric acid solution and etch it for 20min at room temperature, then take out the aluminum sheet and wash it with a large amount of distilled water to stop the reaction. Dry in an oven after ultrasonic cleaning.

[0031] 3. Immerse the aluminum sheet obtained in step 2 into 15nm, 1wt% nano-SiO 2 in the ethanol solution for 2 minutes, take it out and react in the muffle furnace at 300°C for 3 hours, and the nano-SiO 2 grafted onto aluminum surfaces.

[0032] 4. Spray fluorine-silicon modified polyester resin on the aluminum sheet in step 3, and cure at 150°C for 3 hours to obtain a super-hydrophobic coating.

[0033] The obtained superhydrophobic aluminum surface was scanned by SEM as figure 1 As shown, the sur...

example 2

[0035] 1. Ultrasonic clean the aluminum sheet with acetone and toluene for 10 minutes, then wash it with distilled water to remove the oil on the surface of the aluminum sheet, and dry it in an oven at 100°C.

[0036] 2. Put the clean aluminum sheet into 3mol / L hydrochloric acid solution and etch it for 20min at room temperature, then take out the aluminum sheet and wash it with a large amount of distilled water to stop the reaction. Dry in an oven after ultrasonic cleaning.

[0037] 3. Spray fluorine-silicon modified polyester resin on the aluminum sheet in step 3, and cure at 150° C. for 3 hours to obtain a super-hydrophobic coating.

[0038] The obtained superhydrophobic aluminum surface was scanned by SEM as image 3 As shown, the surface structure consists of 1-2 μm step-like structures. It is subjected to a contact angle test, and an anti-frost and anti-icing test. The contact angle test was performed on it ( Figure 4 ), and the anti-frost and anti-icing test, the r...

example 3

[0040] 1. Ultrasonic clean the aluminum sheet with acetone and toluene for 10 minutes, then wash it with distilled water to remove the oil on the surface of the aluminum sheet, and dry it in an oven at 100°C.

[0041] 2. Put the clean aluminum sheet into a mixed solution of 0.5 mol / L hydrochloric acid and 0.5 mol / L oxalic acid solution, etch at room temperature for 15 hours, then take out the aluminum sheet and wash it with a large amount of distilled water to stop the reaction. Dry in an oven after ultrasonic cleaning.

[0042] 3. Immerse the aluminum sheet obtained in step 2 into 15nm, 0.5wt% nano-SiO 2 in n-hexane solution for 10min, take it out and react in muffle furnace at 300°C for 6h, the nano-SiO 2 grafted onto aluminum surfaces.

[0043] 4. Spray fluorine-silicon modified polyester resin on the aluminum sheet in step 3, and cure at 150°C for 3 hours to obtain a super-hydrophobic coating.

[0044] The contact angle test and the anti-frost and anti-icing test were c...

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Abstract

The invention discloses a preparing method for an aluminum surface super-hydrophobic coating with a micro-nano composite structure. The method mainly comprises the steps that firstly, an aluminum sheet is ultrasonically cleaned for 10 min through acetone and methylbenzene and then flushed thoroughly through distilled water, and the aluminum sheet is dried in an oven at the temperature being 100 DEG C; secondly, the cleaned and dried aluminum sheet is immersed in an acid etching agent to be etched, and an aluminum surface with a micron rough structure is obtained; thirdly, after the etched aluminum sheet is ultrasonically cleaned thoroughly, the aluminum sheet is immersed in a nano particle solution, and after the aluminum sheet is treated at the high temperature, an aluminum surface with a micro-nano composite rough structure is obtained; and fourthly, after low-surface-energy fluorosilicone modified polyester resin is sprayed to the aluminum surface with the micro-nano composite rough structure, an aluminum surface with super-hydrophobic performance can be obtained. The super-hydrophobic aluminum sheet prepared through the preparing method has the superior icing preventing performance and very good mechanical strength and can be applied to an air conditioner heat exchange sheet, and frosting and icing of the heat exchange sheet are effectively restrained.

Description

technical field [0001] The invention relates to the field of preparation of super-hydrophobic surfaces, in particular to a preparation method of a super-hydrophobic coating on an aluminum surface with a micro-nano composite structure. Background technique [0002] The air conditioner heats up in a low-temperature environment. Since the outdoor unit is placed outdoors, the moisture in the outdoor air will frost on the cooling fins of the condenser. Ice crystals will accumulate for a long time and form ice, which will easily block the ventilation channels of the cooling fins and cause the condenser to be replaced. The thermal efficiency decreases, affecting the entire heating effect of the air conditioner. [0003] Since the discovery of the "lotus leaf effect", superhydrophobic surfaces have been widely studied due to their excellent properties. Studies have shown that in addition to the excellent self-cleaning effect, the superhydrophobic surface also has excellent anti-fog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D5/08B05D7/14B05D3/10B05D3/02
CPCB05D3/0272B05D3/102B05D5/083B05D7/14B05D2202/25B05D2350/35
Inventor 张庆华王兵詹晓力陈丰秋
Owner ZHEJIANG UNIV
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