Preparation method of super-hydrophobic coating with excellent self-repairing and anti-corrosion properties

Abstract

The invention discloses a preparation method of a super-hydrophobic coating with excellent self-repairing and anti-corrosion properties. The preparation method comprises the following steps: uniformlydispersing SiO2 and TiO2 in a mixed solution of absolute ethyl alcohol and ammonia water, ultrasonically stirring, quickly adding tetraethyl silicate and heptadecafluorotriethoxysilane of perfluorooctanoic acid into the solution, reacting, adding a coupling agent into the system, stirring to obtain a solution with super-hydrophobic property, spraying the prepared super-hydrophobic solution on a substrate and curing to obtain a super-hydrophobic coating with excellent performances, wherein in the step 1, SiO2 and TiO2 dispersed in absolute ethyl alcohol and ammonia water are nano particles inspecification. According to the preparation method of the super-hydrophobic coating with excellent self-repairing and anti-corrosion properties, the coating has excellent anti-corrosion performance, the metal corrosion rate can be obviously reduced, the coating has excellent mechanical properties such as friction resistance, rapid self-repairing of the coating is achieved, the super-hydrophobic performance is achieved, the cost is low, and the production process is simple.

Description

technical field [0001] The invention relates to the technical field of super-hydrophobic coatings, in particular to the preparation of a super-hydrophobic coating with excellent self-repairing and anti-corrosion properties. Background technique [0002] Due to their good physical properties, chemical properties, mechanical properties and excellent processing properties, metal materials not only play a huge role in construction, transportation, machinery manufacturing, etc., but also in national defense, aerospace, and cutting-edge technology. It will react with the environmental medium in which it is located, causing different degrees of corrosion, and bringing huge losses to the national economy. According to survey statistics, the annual metal loss due to corrosion in the world accounts for about 20-40% of the annual metal output , China's annual economic loss due to metal corrosion exceeds 300 billion. [0003] In addition, metal corrosion will also cause waste of resour...

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Problems solved by technology

[0002] Due to their good physical properties, chemical properties, mechanical properties and excellent processing properties, metal materials not only play a huge role in construction, transportation, machinery manufacturing, etc., but also in national defense, aerospace, and cutting-edge technology. It will react with the environmental medium in which it is located, causing different degrees of corrosion, and bringing huge losses to the national economy. According to survey statistics, the annual metal loss due to corrosion in the world accounts for about 20-40% of the annual metal output , China's annual economic loss due to metal corrosion exceeds 300 billion

[0003] In addition, metal corrosion will also cause waste of resources and environmental pollution, and even hinder the development of cutting-edge science, such as the moon landing spacecraft Apollo, because its fuel N 2 o 2 Contains trace amounts of O 2 , resulting in the failure of normal use of the high-pressure vessel due to stress corrosion, which further affected the moon landing plan. The research and development of various new materials need to consider the influence of metal corrosion, and put forward higher requirements for the research of metal corrosion. Therefore, for In-depth research on metal corrosion protection has important social significance and plays a positive role in improving the national economy

[0004] In addition to some mechanical factors such as impact or physical factors such as heat, most metals and the surrounding environment undergo corrosion reactions spontaneously and are universal; hindering the contact between metals and the surrounding environment can effectively slow down its corrosion speed, and coating anti-corrosion is an economical and effective metal protection method, which can not only hinder the contact between metal and surrounding environment, but also has the characteristics of wide adaptability and great practicability; but the current coatings are all It has a certain degree of water permeability and air permeability, and more importantly, the speed of water and oxygen penetration is much higher than the speed of water and oxygen consumption by metal corrosion, so the coating cannot play a complete shielding role. Therefore, researchers have developed a large number of New anti-corrosion coatings or special coatings, such as polypyrrole, polyaniline anti-corrosion coatings and super-hydrophobic anti-corrosion coatings, etc.

However, the preparation of coatings such as polypyrrole and polyaniline faces problems such as complex production process and expensive raw materials. For super-hydrophobic coatings with special rough structures, the contact area between corrosive media and metals can be reduced by virtue of the air layer. Therefore, A lot of research has been done, but generally the interaction between the hydrophobic film and the metal is very weak, which cannot meet the requirements for the mechanical strength of the coating in industrial applications, or after a period of time in a corrosive medium, the superhydrophobic performance will also be weakened. It cannot meet the requirements of metal corrosion protection, so the preparation of a superhydrophobic coating with excellent mechanical stability with long-term stability is of great significance in metal corrosion

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