Cationically curable compositions, coatings, metal articles and applications for metal substrates

Abstract

The invention provides a cationic curing composition for metal substrates, coatings, metal products and applications. The cationic curing composition comprises: polyhydroxyl resin, epoxy compound, oxetanyl-containing compound and cationic initiator, polyhydroxyl resin is polyester resin and / or phenolic resin, hydroxyl group, tertiary epoxy group The molar ratio to the four-membered epoxy group is 1:(1-15):(1-25). The addition of epoxy compounds and oxetanyl-containing compounds is conducive to improving the curing speed of the coating, and the addition of polyhydroxyl resins increases the crosslinking density, which is conducive to improving the adhesion of the coating on the metal substrate. The addition of the oxetanyl compound is beneficial to improve the compatibility of each component. Limiting the molar ratio of the hydroxyl group, the three-membered epoxy group and the four-membered epoxy group in the above-mentioned cationic curing composition to the above-mentioned range can greatly improve the adhesion, flexibility and film formation of the coating on the metal substrate. properties and curing speed.

Description

technical field [0001] The present invention relates to the field of photocuring, in particular, to a cationic curing composition for metal substrates, coatings, metal products and applications. Background technique [0002] Metal packaging coating is an important branch of industrial coatings. It can use its sealing effect on metal surfaces to prevent external water, air, solutions, etc. from corroding and oxidizing metal materials. At the same time, it can also be artistically treated on the painted metal surface, so metal packaging coatings are widely used in the processing of various metal products, and play a role in protection and decoration of metal products. [0003] Traditional metal packaging coatings have some technical defects in the application process, such as: traditional metal packaging coatings have high hardness and low flexibility, so it is very easy to bend, extend, punch, stretch and other processing processes of metal Coating cracks and damage occur. ...

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a cationic curing composition for metal substrates, coatings, metal products and applications to solve the problems of poor flexibility and adhesion in existing metal packaging coatings

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