A kind of recoatable ultraviolet light curable coating that can be thick film construction and preparation method thereof

Abstract

The invention discloses a recoating ultraviolet curing coating capable of performing thick film construction. The recoating ultraviolet curing coating is prepared from an aliphatic urethane acrylate oligomer with a tri-functionality high TG point, a two-functionality urethane acrylate oligomer, a solvent type modified urethane acrylate oligomer, a mixture of 1,6-hexanediol diacrylic ester and dipropylene glycol diacrylate, an initiator, a rheological agent, an optical stabilizing agent and a first solvent. The recoating ultraviolet curing coating for thick film construction, which is disclosed by the invention, is good in recoating adhesion property, good in thermocycling and excellent in weather resistance, and has the advantages that firstly, the operation procedures for coating and producing rejected products can be simplified (no pretreatment or reworking liquid is needed), the properties of rejected products are improved, and the production cost is lowered; secondly, the application range of the product under different weather conditions is widened, and the ineffective time of a coated product for outdoor use is greatly delayed.

Description

technical field [0001] The invention relates to an ultraviolet light curing coating, in particular to a recoatable ultraviolet light curing coating capable of thick film construction. Background technique [0002] UV-curable varnishes have been used in the domestic motorcycle and electric vehicle markets for more than ten years. Due to their excellent appearance, efficient production, and low requirements for equipment and sites, they have developed rapidly. It maintains an absolute market share in the varnish of electric vehicles, but due to the use of a large number of small molecular weight monomers (mostly distributed between 100-300 molecular weight) and multifunctional oligomers in its materials. In the curing process, the cross-linking speed is too fast and the cross-linking density is too large, resulting in high hardness and good wear resistance of the coating film, but at the same time it also brings difficulties in recoating unqualified products and easy cracking ...

AI Technical Summary

Problems solved by technology

This process not only increases the production cost of the enterprise, but also increases the risk of failure when it is used outdoors. The market urgently needs a product with good recoating performance and excellent thick film cracking resistance to extend the application of UV coatings in the field of motorcycle coatings. Range and expiration date for outdoor use

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