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Preparation process of fluorine-free superhydrophobic surface

A technology of super-hydrophobic surface and preparation process, which is applied in the field of super-hydrophobic surface preparation on metal aluminum by using rosin instead of fluoride, which can solve the problems of loss of super-hydrophobic properties, easy wear, shedding, unfavorable industrialization, etc., and achieve the goal of suppressing freezing point The effect of formation, small rolling angle and cheap chemical reagents

Inactive Publication Date: 2019-05-07
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of these low surface energy substances are self-assembled to the substrate surface in the form of molecular layers or connected by chemical bonds. Therefore, when affected by external stress, these low surface energy substances in molecular layers will easily wear and fall off, so that It loses its superhydrophobic properties
In addition, these chemical substances, especially those containing fluorine, have great potential threats to the human body and the environment and are expensive, which is not conducive to industrialization

Method used

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  • Preparation process of fluorine-free superhydrophobic surface
  • Preparation process of fluorine-free superhydrophobic surface
  • Preparation process of fluorine-free superhydrophobic surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The cut aluminum sheet was polished evenly with 400 and 1200 mesh sandpaper, and each sample was ultrasonically cleaned with acetone, ethanol, and deionized water for 5 minutes and then dried. Prepare the concentrated hydrochloric acid into 1M dilute hydrochloric acid, add a certain mass of copper chloride particles, and stir evenly to form a 0.2M copper chloride hydrochloric acid solution. Put the dried sample into the solution and react for 4 minutes, then take it out, wash off the copper attached to the surface, put it into the solution and continue to react for 4 minutes, take the sample out, ultrasonically clean it and dry it, its surface appearance is as follows: figure 1 shown. Then a certain mass of rosin was dissolved in absolute ethanol to prepare a rosin alcohol solution with a mass fraction of 1%. After the dried sample was immersed in the rosin alcohol solution, it was quickly taken out, placed on filter paper to blot the excess solution, and after natural...

Embodiment 2

[0030] The cut aluminum sheet was polished evenly with 400 and 1200 mesh sandpaper, and each sample was ultrasonically cleaned with acetone, ethanol, and deionized water for 5 minutes and then dried. Prepare the concentrated hydrochloric acid into 2M dilute hydrochloric acid, add a certain mass of copper chloride particles, and stir evenly to form a 0.2M copper chloride hydrochloric acid solution. The dried sample was put into the solution and reacted for 4 minutes, then taken out, ultrasonically cleaned and dried. Then a certain mass of rosin was dissolved in absolute ethanol to prepare a rosin alcohol solution with a mass fraction of 2.5%. The solution was dropped into the center of the dry sample with a disposable needle. Since the sample is super-affinity to alcohol, the solution will smear quickly, and a super-hydrophobic surface will be obtained after drying at 150°C.

Embodiment 3

[0032] The cut Al7075 alloy was polished evenly with 400 and 1200 mesh sandpaper, and the samples were ultrasonically cleaned with acetone, ethanol, and deionized water for 5 minutes and then dried. Prepare the concentrated hydrochloric acid into 2M dilute hydrochloric acid, add a certain mass of copper chloride particles, and stir evenly to form a 0.2M copper chloride hydrochloric acid solution. The dried sample was put into the solution and reacted for 4 minutes, then taken out, ultrasonically cleaned and dried. Then a certain mass of rosin was dissolved in absolute ethanol to prepare a rosin alcohol solution with a mass fraction of 4%. The solution was dropped into the center of the dry sample with a disposable needle. Since the sample is super-affinity to alcohol, the solution will smear quickly, and a super-hydrophobic surface will be obtained after drying at 150°C.

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Abstract

The invention discloses a preparation process of a fluorine-free superhydrophobic surface. The process comprises the following steps: putting metal aluminum into a hydrochloric acid solution of copperchloride, performing a reaction to obtain a sample having a rough structure, uniformly coating the sample by using a prepared rosin ethanol solution, and performing drying to obtain a sample having ahigh contact angle and a small rolling angle with water. According to the process provided by the invention, the fluorine-free low-price environmentally-friendly superhydrophobic surface can be easily prepared on the metal aluminum by chemical corrosion and rosin coating methods, and the process is simple and easy to operate; a rosin coating is used to replace a traditional modified fluoride molecular layer, so that the mechanical stability of the superhydrophobic surface is greatly improved, and the production costs are reduced; and the prepared superhydrophobic surface has the characteristics of self cleaning, icing resistance and drag reduction.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and relates to a preparation process for preparing a fluorine-free super-hydrophobic layer on an aluminum surface, in particular to a process for preparing a super-hydrophobic surface on metal aluminum by using rosin instead of fluoride. Background technique [0002] In recent years, solid surface wettability has attracted extensive attention. By studying the lotus leaves that "come out of the silt but not stained", it is found that the two most important factors for superhydrophobicity are: the rough structure of the micro-nano composite and the biological wax on the surface that is immiscible with water. At present, there are two main methods for preparing superhydrophobic surfaces: one is to prepare suitable micro-nano rough structures on hydrophobic materials, and the other is to prepare hydrophilic surfaces with rough structures and then modify them with low surface energy su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D193/04C09D5/16C09D5/08
Inventor 刘晓为张海峰脱艳景荣婉婷
Owner HARBIN INST OF TECH
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