A salt spray-resistant, recoverable benzoxazine-based superhydrophobic coating and preparation method thereof

Abstract

The invention relates to the field of super-hydrophobic surfaces, in particular to a salt mist-resistant and restorable benzoxazine-based super-hydrophobic coating layer and a preparation method thereof. The preparation method specifically comprises the following steps of introducing an interface layer structure with crosslinking density gradient change into the super-hydrophobic surface; loading imidazole or imidazole salt into a mesoporous material, mixing with benzoxazine, coating onto a substrate surface, removing solvent, crosslinking and curing, and cooling, so as to obtain the coating layer. After curing, the super-hydrophobic coating layer can form an inorganic-organic interpenetrated network structure of the benzoxazine and the mesoporous material, and an interface layer structure with polybenzoxazine crosslinking density gradient change caused by the fact that the catalyst concentration is freely diffused from the center of the mesoporous material to the substrate.

Description

technical field [0001] The invention relates to the field of super-hydrophobic surfaces, in particular to a salt-spray-resistant, recoverable benzoxazine-based super-hydrophobic coating and a preparation method thereof, in particular to introducing an interfacial layer structure with cross-linking density gradients into a super-hydrophobic coating surface. Background technique [0002] Marine metals are closely related to national defense and the national economy and people's livelihood, and their superior performance will greatly enhance the country's comprehensive national strength and improve the national economy and people's livelihood. Due to the presence of a large amount of chloride ions in seawater and the presence of a large amount of free chlorine in the marine atmosphere, even stainless steel with good corrosion resistance will corrode in the marine environment, resulting in a serious decline in performance. It greatly affects the service life of materials, and at...

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Problems solved by technology

However, the above methods have certain limitations, such as large energy consumption, expensive materials, cumbersome steps, and restrictions on substrates, etc., which limit their wide application. The material lacks use value due to its shortcomings such as poor wear resistance and poor durability

Patents 2012101785611, CN201410185923.9, and CN201310291889.9 have also prepared superhydrophobic coatings with wear resistance, but there are disadvantages such as high requirements on the substrate, long process time, and complicated preparation; Chinese patent 201610470911X adopts the method of spraying, so that Benzoxazine and mesoporous silica form an inorganic-organic interpenetrating network to prepare wear-resistant superhydrophobic coatings. Although the preparation process is simple, there are few interfacial bonds and the wear resistance is still poor.

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