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CN-121975437-A - Thousand-layer stone-like ZnS/Zn-MOFs@SC superhydrophobic coating and preparation method and application thereof

CN121975437ACN 121975437 ACN121975437 ACN 121975437ACN-121975437-A

Abstract

The invention discloses a thousand-layer stone-like ZnS/Zn-MOFs@SC super-hydrophobic coating and a preparation method and application thereof, comprising the steps of mixing absolute ethyl alcohol and deionized water, adding polyvinylpyrrolidone and 2-amino terephthalic acid, carrying out ultrasonic treatment, adding zinc acetate, continuing ultrasonic treatment, adding thiourea, and magnetically stirring to obtain a precursor solution; pouring the pretreated magnesium alloy into the precursor solution for sealing, performing hydrothermal reaction, alternately cleaning with deionized water and ethanol after the reaction is finished, and drying to obtain a ZnS/Zn-MOFs composite coating, performing ultrasonic clarification on stearic acid and chloromycetin co-dissolved absolute ethanol, vertically immersing the ZnS/Zn-MOFs composite coating into the mixed solution, drying with nitrogen, and repeatedly immersing and drying to obtain the thousand-layer stone-like ZnS/Zn-MOFs@SC super-hydrophobic coating. According to the invention, the ZnS inorganic skeleton endows the coating with high mechanical strength, and the micro-nano dual coarse structure of Zn-MOFs and the stearic acid low surface energy layer cooperate to enable the surface to have self-cleaning capability, so that dust can be taken away by liquid drops rolling off, and the coating is free of maintenance during long-term operation.

Inventors

  • HU RONGJUN
  • WANG SHANLIN
  • DING CHAO
  • JIANG GAOFENG
  • FAN ZHENGLONG
  • LI AONAN
  • Fu Ninglong
  • FAN LEI
  • Yuan Xianmei
  • TIAN TAO
  • Hu Aji
  • TAO LIMING
  • WU LANG
  • LI FANG
  • ZHANG JIANWEN

Assignees

  • 贵州电网有限责任公司

Dates

Publication Date
20260505
Application Date
20251124

Claims (10)

  1. 1. A preparation method of a thousand-layer stone-like ZnS/Zn-MOFs@SC super-hydrophobic coating is characterized by comprising the steps of, Mixing absolute ethyl alcohol with deionized water, adding polyvinylpyrrolidone and 2-amino terephthalic acid, performing ultrasonic treatment, adding zinc acetate, continuing ultrasonic treatment, adding thiourea, and magnetically stirring to obtain a precursor solution; Pouring the pretreated magnesium alloy into the precursor solution, sealing, performing hydrothermal reaction, alternately cleaning with deionized water and ethanol after the reaction is finished, and drying to obtain a ZnS/Zn-MOFs composite coating; And (3) carrying out ultrasonic clarification on stearic acid and chloromycetin co-dissolved absolute ethyl alcohol, vertically immersing the ZnS/Zn-MOFs composite coating into the mixed solution, drying by nitrogen, and repeatedly immersing and drying to obtain the thousand-layer stone-like ZnS/Zn-MOFs@SC super-hydrophobic coating.
  2. 2. The method of claim 1, wherein the hydrothermal temperature is 150-180 ℃.
  3. 3. The method of claim 2, wherein the hydrothermal temperature is 160 ℃.
  4. 4. The method of claim 1, wherein the mass ratio of polyvinylpyrrolidone to 2-amino terephthalic acid is 1-4:1-4.
  5. 5. The method of claim 1, wherein the mass ratio of zinc acetate to thiourea is 0.8-3.2:1.
  6. 6. The method of claim 1, wherein the mass ratio of stearic acid to chloramphenicol is 1-5:1-5.
  7. 7. The method of claim 1, wherein the hydrothermal time is 2-12 hours.
  8. 8. The method of claim 1, wherein the hydrothermal time is 4 hours.
  9. 9. The thousand-layer stone-like ZnS/Zn-MOFs@SC superhydrophobic coating prepared by the preparation method of claims 1-8.
  10. 10. The use of a thousand-layer stone-like ZnS/Zn-mofs@sc superhydrophobic coating as defined in claim 9 in material surface engineering and corrosion protection.

Description

Thousand-layer stone-like ZnS/Zn-MOFs@SC superhydrophobic coating and preparation method and application thereof Technical Field The invention belongs to the technical field of material surface engineering and corrosion protection, and particularly relates to a thousand-layer stone-like ZnS/Zn-MOFs@SC superhydrophobic coating, and a preparation method and application thereof. Background The extra-high voltage power transmission and transformation system is developing towards higher voltage class, longer transmission distance and longer service life, and the double requirements of 'light weight and long service life' are provided for auxiliary structural components of insulators. The density of the magnesium alloy (AZ 31B) is only 1.7gcm -3, which is about six components of aluminum and two components of steel, but has high specific strength, excellent vibration reduction and electromagnetic shielding performance, and can obviously reduce the load of the tower and inhibit wind vibration fatigue, thus being an ideal light material for key components such as insulator connecting caps, brackets, fasteners and the like. However, magnesium alloy standard electrode potentials are as low as-2.37V, and loose and porous MgO/Mg (OH) 2 oxide films are extremely easy to generate in high humidity, high salt fog and industrial atmosphere containing SO 2、NOx, and galvanic corrosion, pitting corrosion and stress corrosion cracking are induced. The high-humidity environment of the beach or heavy industrial area is more severe, and the high-concentration Cl - and the microbial metabolite act cooperatively to cause the surface micro-area acidification and the biomembrane-corrosion coupling damage, so that the magnesium alloy part fails in advance and the operation safety of an extra-high voltage system is directly threatened. Therefore, it is urgent to solve the serious problem that the corrosion rate of magnesium alloy is too fast. The superhydrophobic coating (water contact angle >150 DEG, roll angle <10 DEG) inspired by the lotus leaf effect can remarkably reduce the retention of corrosive medium. Wenzel and Cassie-Baxter theory together indicate that the air cushion captured by the micro/nano composite coarse structure can greatly reduce the solid-liquid interface area and inhibit ion penetration. Super-hydrophobic layers are constructed on magnesium alloy through hydrothermal, electrodeposition and other methods, but single organic or inorganic coatings are often failed rapidly due to mechanical abrasion, thermal expansion and cold contraction in ultra-high voltage scenes with coexistence of sand blast, ultraviolet irradiation and power frequency corona. Therefore, a need exists for a multifunctional surface protection technique that combines high hardness, toughness, and environmental stability. Disclosure of Invention This section is intended to outline some aspects of embodiments of the application and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description of the application and in the title of the application, which may not be used to limit the scope of the application. The present invention has been made in view of the above and/or problems occurring in the prior art. Therefore, the invention aims to overcome the defects in the prior art and provide a thousand-layer stone-like ZnS/Zn-MOFs@SC superhydrophobic coating, and a preparation method and application thereof. In order to solve the technical problems, the invention provides a preparation method of a thousand-layer stone-imitated ZnS/Zn-MOFs@SC super-hydrophobic coating, which comprises the following steps of, Mixing absolute ethyl alcohol with deionized water, adding polyvinylpyrrolidone and 2-amino terephthalic acid, performing ultrasonic treatment, adding zinc acetate, continuing ultrasonic treatment, adding thiourea, and magnetically stirring to obtain a precursor solution; Pouring the pretreated magnesium alloy into the precursor solution, sealing, performing hydrothermal reaction, alternately cleaning with deionized water and ethanol after the reaction is finished, and drying to obtain a ZnS/Zn-MOFs composite coating; And (3) carrying out ultrasonic clarification on stearic acid and chloromycetin co-dissolved absolute ethyl alcohol, vertically immersing the ZnS/Zn-MOFs composite coating into the mixed solution, drying by nitrogen, and repeatedly immersing and drying to obtain the thousand-layer stone-like ZnS/Zn-MOFs@SC super-hydrophobic coating. As a preferable scheme of the preparation method, the hydrothermal temperature is 150-180 ℃. As a preferred embodiment of the preparation method of the present invention, the hydrothermal temperature is 160 ℃. As a preferable scheme of the preparation method, the mass ratio of polyvinylpyrrolidone to 2-amino terephthalic acid is 1-4:1-4. As a preferable scheme of the preparation method, the mass ratio of the zinc acetate to the t