Preparation method for polyurethane nano zinc oxide super-hydrophobic coating

Abstract

The invention discloses a preparation method for a polyurethane nano zinc oxide super-hydrophobic coating. The method comprises the following preparation steps: grinding a base material, cleaning andpre-treating the base material, adopting a mechanical-ultrasonic vibrating way to prepare a polyurethane mixed solution; coating a certain thickness of the polyurethane mixed solution on the surface of a base body, enabling the mixed solution to separate out and cure into a film under a high-moisture environment, cleaning and drying the film, putting the film into an alcohol solution with low-surface-energy substances to modify, and drying the film to the polyurethane nano zinc oxide super-hydrophobic coating with super-hydrophobicity. The preparation method is simple in preparation conditionand operation requirement; the prepared coating has controllable thickness, and uniform and compact surface micro-nano structure distribution; and a coating contact angle can be 160 degrees after thelow-surface-energy substances are modified.

Description

technical field [0001] The invention relates to the technical field of preparation of superhydrophobic materials, in particular to a method for preparing a polyurethane nanometer zinc oxide superhydrophobic coating. Background technique [0002] A superhydrophobic surface refers to a surface with a static contact angle of water droplets greater than 150° and a rolling angle of less than 10°. This type of surface was first discovered on lotus leaves. Through the interaction of special micro-nano structures and low surface energy, surface water droplets Not easy to apply. Superhydrophobic surfaces also exhibit excellent properties such as self-cleaning, anti-corrosion, anti-icing, and anti-fog in different environments, so they have great application prospects in the fields of construction, instrumentation, and scientific research. [0003] Although there are quite a few ways to prepare super-hydrophobic surfaces, the rough structure of super-hydrophobic surfaces is at the mi...

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Problems solved by technology

[0003] Although there are quite a few ways to prepare super-hydrophobic surfaces, the rough structure of super-hydrophobic surfaces is at the micro-nano scale and is easily damaged, resulting in the loss of super-hydrophobic properties from the surface. The size of the surface has relatively precise requirements, and the superhydrophobic preparation method with a large roughness cannot control the thickness of the coating well, which affects the application of the superhydrophobic surface.

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