A kind of cathodic electrophoretic paint and its preparation method and application

Abstract

The invention discloses a cathodic electrophoretic coating and its preparation method and application. The cathodic electrophoretic coating includes a cationic perfluoropolyether modified resin and a blocked polyisocyanate crosslinking agent. The raw material of the cationic perfluoropolyether modified resin includes CF 3 CF 2 CF 2 O[CF(CF 3 ) CF 2 O] n CF(CF 3 )‑Y‑C(R 1 )=CH 2 , HC=CR a COOR b A copolymer, polyamine and organic acid formed by copolymerization with monomer C, monomer C is a combination of one or more selected from structural monomers containing epoxy groups and double bonds; preparation: make the above The intermediate of the reaction between the copolymer and the polyamine is reacted with an organic acid to make a cationic perfluoropolyether modified resin, and the modified resin is mixed with a blocked polyisocyanate crosslinking agent to prepare an emulsion to obtain a cathodic electrophoretic coating; it can be Applied to hardware products; the coating and its cured layer of the present invention have the advantages of excellent performance, easy degradation, low toxicity and the like.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a cathodic electrophoretic coating and a preparation method and application thereof. Background technique [0002] As a new type of low-pollution, energy-saving, resource-saving, protective and anti-corrosion coating, electrophoretic coating has the characteristics of smooth coating film, good water resistance and chemical resistance, and it is easy to realize the mechanization and automation of the coating industry , suitable for complex shapes, edges, corners, and holes, and is widely used in the coating of hardware such as automobiles, automatic vehicles, electromechanical appliances, and home appliances. Electrophoretic coatings and coating methods have been applied in industry since the 1960s. Electrophoretic coatings can be used for fully closed circulation system operation, and the utilization rate of coatings can reach about 95%. [0003] However, with the continuous improvement ...

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Problems solved by technology

Traditional electrophoretic coatings are poor in hydrophobicity, anti-fouling and weather resistance, and cannot meet the new requirements of high-end hardware products.

[0004] In recent years, some improvements have been gradually made in the prior art. For example, the Chinese invention CN 101993576 introduced acrylic acid fluorine monomers. Although an electrophoretic coating with good hydrophobicity and weather resistance was prepared to a certain extent, the applicant In the actual use process, it was found that this coating is difficult to biodegrade in the later treatment process, and it is decomposed and / or metabolized to form PFOA (carcinogen released by the International Agency for Research on Cancer of the World Health Organization on October 27, 2017) PFOA is included in the list of 2B carcinogens in the list), after research by the applicant, it is found that the reason for this imagination is the introduction of acrylic acid fluorine monomers, such long-chain fluoroalkyl groups will not only be decomposed or metabolized The possibility of PFOA is great, and it also has the disadvantages of refractory degradation, high bioaccumulation toxicity and great environmental hazards. Therefore, the electrophoretic coating prepared according to the above method is not very consistent with the current concept of sustainable development of the environment and people-oriented.

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