A kind of preparation method of gradient incremental structure liquid repellent coating

Abstract

A preparation method for a liquid-proof coating adopting a gradient increasing structure, comprising the following steps: (1) placing a base material in a reaction cavity of a plasma chamber, continuously vacuumizing the reaction cavity till the vacuum degree in the reaction cavity is 10-200 millitorrs, and inflating an inert gas or nitrogen; (2) inflating first, second and third monomer steams at the same time, and starting plasma discharge to conduct chemical vapor deposition; (3) after discharge, turning off a plasma power source, stopping inflating the three monomer steams, continuously vacuumizing, and after the vacuum degree of the reaction cavity is kept at 10-200 millitorrs for 1-5 min, inflating the atmosphere one atmospheric pressure, and then taking out the base material, wherein the first monomer steam is a mono-functionality unsaturated fluorocarbon resin with the inflated flux of 10-1,000 μL / min; the second monomer steam is a polyfunctionality unsaturated hydrocarbon derivative with the inflated initial flux of 0 μL / min, and is increasing in the rate of 1-10 μL / min, the maximum inflated flux is 500μL / min; and the third monomer steam is a polyfunctionality unsaturated hydrocarbon derivative with the inflated initial flux of 0 μL / min, and is increasing in the rate of 1-10 μL / min, the maximum inflated flux is 500μL / min.

Description

technical field [0001] The invention belongs to the technical field of plasma chemical vapor deposition, in particular to a preparation method of a liquid-proof coating. Background technique [0002] Plasma chemical vapor deposition is a technology that uses plasma to activate reactive gases to promote chemical reactions on the surface of the substrate or in the space near the surface to form a solid film. Compared with other coating preparation methods, plasma coating technology has the following advantages: (1) dry process, the film produced is uniform and pinhole-free; (2) coating preparation temperature is low, and can be carried out at room temperature, effectively avoiding Damage to temperature-sensitive devices; (3) plasma technology can not only prepare micron-scale coatings but also ultra-thin nano-scale coatings; (4) solvent resistance and chemical corrosion resistance of plasma polymerized films , heat resistance, wear resistance and other chemical and physical p...

AI Technical Summary

Problems solved by technology

However, most thick coatings and ultra-thick coatings have residual stress, which is prone to stress cracking under the conditions of variable temperature and deformation, and the poor compatibility between the interfaces of multi-layer structure coatings is also prone to peeling and cracking, losing its barrier properties

In addition, a coating with uniform composition usually has a single performance, and it is difficult to ensure that the coating has excellent binding force, mechanical properties, hydrophobic properties, etc.

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