Method for preparing polytetrafluoroethylene super-hydrophobic coating
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A technology of polytetrafluoroethylene and super-hydrophobic coating, which is applied in the field of super-hydrophobic, can solve the problems of expensive materials, retention, complex processing process, etc., and achieve the effect of simple and easy production method and convenient large-scale production
Active Publication Date: 2016-01-13
山东施博格特种橡塑材料有限责任公司
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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
Method used
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Embodiment 1
[0024] (1) Put a 0.2mm thick polytetrafluoroethylene plate and a glass substrate into a reaction kettle with a heating device;
[0025] (2) Pass carbon dioxide gas into the kettle through a high-pressure pump, control the temperature at 260°C, the pressure at 25Mpa, and saturate for 36 hours;
[0026] (3) Pressure relief, the pressure relief time is 30s;
[0027] (4) After the device is cooled, take out the polytetrafluoroethylene plate and the glass substrate to obtain a superhydrophobic polytetrafluoroethylene plate and a superhydrophobic glass plate.
Embodiment 2
[0029] (1) Put the 0.6mm thick polytetrafluoroethylene plate and metal substrate into the reaction kettle with heating device;
[0030] (2) Pass carbon dioxide gas into the kettle through a high-pressure pump, control the temperature at 300°C, the pressure at 30Mpa, and saturate for 12 hours;
[0031] (3) Pressure relief, the pressure relief time is 100s, in which the pressure relief valve is connected with the metal copper pipe, and then emptied;
[0032] (4) At a temperature of 300°C, continue to feed carbon dioxide gas into the kettle through a high-pressure pump, keep the pressure at 30Mpa, saturate for 10h, and then release the pressure;
[0033] (5) repeat step (4) twice again;
[0034] (6) After the device cools down, take out the polytetrafluoroethylene plate and metal substrate, remove the metal copper pipe connected to the pressure relief valve, and test its contact angle.
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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...
Claims
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