A kind of preparation method of carbon nanotube composite ceramic network modified water-based non-stick coating

Abstract

The invention relates to the field of coatings, and discloses a method for preparing a carbon nanotube composite ceramic network modified water-based non-stick coating, including: 1) pre-dispersion of carbon nanotubes; 2.1) mixing carbon nanotube slurry with a silane coupling agent 2.2) Coating amorphous alumina on the surface of carbon nanotubes, and then reacting with tetraethyl orthosilicate to obtain ceramics 3) Premix the fluorine-containing emulsion and tetraethyl orthosilicate, then add the carbon nanotubes modified in situ by the ceramic network, heat up and stir the reaction, and then add other components. The method of the present invention can form an organic-inorganic interpenetrating network structure, so that carbon nanotubes are locked in the pores of the network structure, and form a conductive network channel, which has little impact on the performance of carbon nanotubes and can improve the physical and mechanical properties of the coating. performance and anti-corrosion effect.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a preparation method of a carbon nanotube composite ceramic network modified water-based non-stick coating. Background technique [0002] Due to its own structure, iron cookware is very easy to rust during transportation, storage and use. The traditional method has always been to coat the surface of the cookware with an oil layer. Ash suction causes secondary pollution. Anti-corrosion is the demand of every iron cookware consumer. Among the many solutions, the most convenient and common one is the coating method, which can effectively prevent or alleviate the oxygen in the environment by forming a coating on the surface of the substrate. , moisture, etc., in contact with the base material to achieve the purpose of anti-corrosion, the market capacity of coatings dedicated to anti-corrosion of iron cookware is huge. In addition, another major development trend of iron cookware is non-stic...

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Problems solved by technology

[0005] However, although the modification of carbon nanotubes with silane coupling agent can improve their dispersion to a certain extent, it will more or less affect the performance of carbon nanotubes, and the surface of commercially available carbon nanotubes has lost a large amount. Part of the hydroxyl functional groups, so before using the silane coupling agent to modify it, it needs to be treated. Generally, the mixed acid system of concentrated sulfuric acid and concentrated nitric acid is used to oxidize it, so that more hydroxyl functional groups can be regenerated on the surface of carbon nanotubes. It is easy to modify, but this process will bring a lot of acid pollution, and if it is not treated, the modification of carbon nanotubes by the silane coupling agent is difficult to bond to the carbon nanotubes, showing a physical blending When added to organic coatings, this physical coating state is easily destroyed, thus losing the effect of preventing carbon nanotubes from agglomerating

[0006] It can be seen from the above that the traditional method of modifying carbon nanotubes with silane coupling agents will affect the physical and mechanical properties and anticorrosion effect of anticorrosion coatings.

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