Method for preparing polytetrafluoroethylene super-hydrophobic coating

Abstract

The invention discloses a method for preparing a polytetrafluoroethylene super-hydrophobic coating. According to the super-hydrophobic coating, in actual application, the contact angles between water drops and the surface are 150-165 degrees, the rolling angles of the water drops on the surface of a material are smaller than 10 degrees, and the polytetrafluoroethylene super-hydrophobic coating has good hydrophobicity. The method for preparing the polytetrafluoroethylene super-hydrophobic coating comprises the steps of adopting a supercritical method, placing a polytetrafluoroethylene plate and a substrate in a reaction kettle with a heating device, leading gas into the kettle, controlling temperature and pressure, causing the led-in gas to be in a super-critical state, maintaining pressure for 12-120 h, performing decompression cooling, and obtaining a super-hydrophobic polytetrafluoroethylene plate and a super-hydrophobic substrate. The inner wall of a metal pipe connected with a pressure release valve and the inner wall of a container are also super-hydrophobic. The method for preparing the super-hydrophobic coating is simple, practical and free of solvent in preparation process and facilitates large-scale production.

Description

technical field [0001] The invention relates to the technical field of superhydrophobic, in particular to a preparation method of a polytetrafluoroethylene superhydrophobic coating. Background technique [0002] The wetting phenomenon on the surface of materials is essentially an interface phenomenon, which is extremely common in both nature and human production and life. In order to adapt to the environment, organisms in nature seek various ways of survival for themselves. The water droplets on the surface of the lotus leaf slide freely, the wings of the butterfly are not wet by the rain, and the water can stand upright on the water. The superhydrophobic phenomenon on the surface of these animals and plants is no different from the result of their own adaptation to the environment. But this excellent nature can be learned and used for reference. It is generally considered that the contact angle between water and the surface is above 90°, which can be considered as a hydro...

AI Technical Summary

Problems solved by technology

Although new technologies and new methods for preparing superhydrophobic surfaces are changing with each passing day, they are either expensive in materials, complex in processing, or the use of organic solvents, etc., which limit the large-scale industrial production of most methods. Use, can only stay in the research of the laboratory

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