Method for preparing high-temperature-resistant super-hydrophobic coating in situ

Abstract

The invention discloses a method for preparing a high-temperature-resistant super-hydrophobic coating in situ. The method comprises the following steps: (1) conducting in-situ copolymerization of organosilicon monomers and nano silicon dioxide particles; (2) preparing sol nano particles; (3) preparing a coating solution; (4) preparing a super-hydrophobic surface; (5) performing thermal treatment on a coating. The method solves the problems of small adhesive force, complex technology, high cost, expensive raw materials and the like of the conventional super-hydrophobic coating. The contact angle between water and the super-hydrophobic coating prepared in the invention is 150-160 degrees, the rolling angle is smaller than or equal to than 5 degrees, and the adhesive force can reach the first grade; the super-hydrophobic coating can keep a super-hydrophobic property even after being heated at 450 DEG C, and has unique properties of self cleaning, corrosion resistance and super hydrophobicity. The method is simple in process, and convenient to operate,. The super-hydrophobic coating is suitable for large-area construction, and has a potential and wide application value in various fields such as the industry, construction, national defense and medicine.

Description

technical field [0001] The invention relates to a preparation method of a hydrophobic coating, in particular to an in-situ preparation method of a high-temperature-resistant super-hydrophobic coating. Background technique [0002] People's understanding of the phenomenon of superhydrophobicity originally came from nature. For example, lotus leaves can emerge from mud without staining because of the superhydrophobicity on the surface. The key reason is that there are a large number of micro-nano structure milky protrusions on the leaf surface and Commonly caused by the waxy substance. This phenomenon and reason have aroused great interest of material researchers, and a variety of superhydrophobic coating materials have been prepared. [0003] Chinese patent (CN1544482) through the fluorine-containing monomer 60 Co irradiated, in the atmosphere of non-fluorine-containing olefins, polymerized into a superhydrophobic film, and prepared a fluorine-containing copolymer. The cont...

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Problems solved by technology

[0003] Chinese patent (CN1544482) through the fluorine-containing monomer 60 Co irradiated, in the atmosphere of non-fluorine-containing olefins, polymerized into a superhydrophobic film, and prepared a fluorine-containing copolymer. The contact angle of the film was greater than 130°. The surface water contact angle obtained by this method was relatively low, and the raw material contained Fluorine, expensive materials, relatively difficult to operate, high requirements on the environment and operators

Chinese patent (CN1272114C) reported the use of non-crystalline polymer phase separation during the volatilization of poor solvents to form a rough super-hydrophobic surface to achieve super-hydrophobic phenomenon. The surface adhesion of the coating produced by this method is extremely poor, and at the same time Some reagents are toxic (toluene, benzene, etc.), which is not conducive to environmental protection and human health

Chinese patent (CN102553812A) uses etching on the surface of the polymer substrate to prepare the primary structure of the columnar array of the same material as the substrate material, and then deposits a zinc oxide seed layer on the surface of the primary structure of the columnar array, and then Putting the substrate into a growth solution that can grow zinc oxide nanowire arrays, so that the secondary structure of zinc oxide nanowire arrays grows on the surface of the primary structure, and then the polymer substrate with the primary and secondary structures is prepared. After immersing in a solution containing hydrophobic substances, the surface of the primary and secondary structures on the polymer substrate is completely attached to the hydrophobic substance, then the polymer substrate is taken out and dried to obtain the required super-hydrophobic surface. The process equipment is complex (laser irradiation, etc.), cannot be operated on a large area, so the application is limited

Chinese patent (CN102795786A) directly disperses and blends silicone resin and silica nanoparticles in ethanol or cyclohexane, and then sprays to obtain a super-hydrophobic surface, but the coating prepared by this method has extremely poor adhesion and the surface becomes powdery

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