High-strength coating formed by virtue of photo-thermal dual-curing and preparation method thereof

Abstract

The invention provides a coating which is formed under the condition of photo-thermal dual-curing and is good in hardness and high in wear resistance. The coating is obtained by performing UV (ultraviolet) curing at first and then performing thermal curing on the following materials in percentage by weight: 30-60% of a low polymer with -OH, 15-36% of a monomer with -OH, 19-30% of a closed type polyisocyanate curing agent with -NCO, 2-5% of a photoinitiator and 0.2-0.8% of an auxiliary agent, wherein the low polymer with -OH is bisphenol A epoxy acrylate, polyacrylate or polyurethane acrylate, and the monomer is one, two or three types of ethyl metrhacrylate, tri(propylene glycol) diacrylate or trimethylolpropane triacrylate. The polyurethane polymer and the polyacrylate polymer in the coating provided by the invention are crosslinked by virtue of chemical bonds, and a formed single-molecule space structure is more compact in structure, and is obviously improved on hardness and wear resistance. The invention also provides a preparation method of the coating.

Description

technical field [0001] The invention relates to a coating, in particular to a high-strength coating, and more particularly to a coating with high hardness and good wear resistance formed under the dual curing of light and heat. The invention also relates to a method for the preparation of such a coating as described above. Background technique [0002] Coating is a solid continuous film obtained by one application of paint. The purpose is to protect, insulate or decorate substrates such as metal, glass, fabric or plastic. The paint is usually in liquid state and must be cured after application to form a dense coating. layer. Photocuring usually also refers to UV curing, which means that under the action of ultraviolet light, the photosensitive substances in the coating system undergo photochemical reactions to generate active fragments, which trigger the polymerization and crosslinking of oligomers or active monomers in the system, thereby making the system The curing meth...

AI Technical Summary

Problems solved by technology

However, most of the researches on photothermal dual-curing coatings currently use the physical mixing of two different functional group resins or the preparation of interpenetrating network polymers (IPNs) to form film-forming substances. The morphology of polymers depends on the composition. Due to the poor compatibility and polymerization kinetics, phase separation will inevitably occur, resulting in uneven performance of the coating film, and even cracking caused by uneven stress.

[0004] In recent years, there have been many research reports on the polymers formed by two different curing methods in photothermal dual curing, which form a uniform polymer through chemical bonds as the film-forming substance of the coating, but the focus of these studies It often falls on the structure type and microscopic morphology of the polymer, but the research on the properties of the coating is not deep enough, which leads to the limitation of its practical industrial application

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