Preparation methods of oxidized graphene/polyaniline/titanium dioxide nanocomposite and polyaniline nanometer anticorrosive paint

Abstract

The invention discloses preparation methods of an oxidized graphene / polyaniline / titanium dioxide nanocomposite and polyaniline nanometer anticorrosive paint. The preparation method of the nanocomposite comprises the steps that 1, a sodium hydroxide solution or a hartshorn is adopted as a dispersing agent, and ultrasonic exfoliation is performed on oxidized graphite to obtain oxidized graphene; 2, the oxidized graphene is added into an aniline organic sulfonic acid solution, and stirring is performed for 10-16 h to obtain an oxidized graphene / polyaniline nanocomposite; 3, nanometer titania is added into the organic sulfonic acid solution of the oxidized graphene / polyaniline nanocomposite obtained in the step 2, stirring is performed for 10-16 h, and centrifuging, washing and drying are performed in sequence to obtain the oxidized graphene / polyaniline / titanium dioxide nanocomposite. The raw materials are cheap and easy to obtain, the technology is simple and easy to control, and the obtained polyaniline nanometer anticorrosive paint is excellent in anticorrosive performance and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of metal anticorrosion such as aluminum alloys, and in particular relates to a preparation method of a graphene oxide / polyaniline / titanium dioxide nanocomposite material and a polyaniline nanoanticorrosion coating. Background technique [0002] Metal materials such as aluminum alloy have the characteristics of high strength, high hardness, good electrical and thermal conductivity, and excellent mechanical properties, so they have important and wide applications in modern society, but the loss and harm caused by the corrosion of metal materials are also difficult. Estimated. At present, most aluminum alloy products adopt the pretreatment represented by dichromic acid surface oxidation, the primer represented by epoxy zinc yellow paint, and the anti-corrosion process of top paint such as alkyd paint and acrylic polyurethane paint. However, the above process has the following problems in the process of use: (1...

AI Technical Summary

Problems solved by technology

However, the above process has the following problems in the process of use: (1) As the use environment of metal materials becomes more and more complex, the traditional dichromic acid surface oxidation treatment method gradually cannot meet the requirements of comprehensive passivation of the alloy surface, and the passivation solution A large amount of highly toxic substances such as hexavalent chromium are produced, which cannot meet the requirements of environmental protection; (2) Epoxy zinc yellow primers produce a large amount of toxic and harmful volatile organic compounds VOC during the coating and use process, which has side effects on the environment and does not meet the environmental requirements. The green development trend of the times and technology; (3) The traditional primer film cannot resist Cl in a humid and corrosive environment - (4) Limited by the structure of the organic molecule itself, the long-term weather resistance of the epoxy resin substrate in the environment is insufficient, and it is prone to aging and falling off

To sum up, it can be seen that the current anti-corrosion treatment process for metal materials such as aluminum alloy can no longer meet the needs of modern products.

[0003] Although polyaniline anti-corrosion coatings have unique anti-pitting and anti-scratch properties, they have problems such as poor solubility, shielding and film-forming properties, and are not suitable for direct use as coatings.

Images