Double-curing varnish paint

Abstract

The invention discloses a double-curing varnish paint which is prepared from the following components in parts by mass: 3-6 parts of double-curing varnish, 1 part of curing agent and 0.5-1 part of diluter. The double-curing varnish comprises the following components in percentage by mass: 10-60% of hydroxy acrylic resin, 10-30% of UV (ultraviolet) resin, 1-30% of active diluter, 0.5-4% of photoinitiator, 1-3% of antiaging agent, 1-3% of leveling agent, 1-3% of drying agent and 10-30% of solvent. The double-curing varnish paint uses the free-radical polymerization-polycondensation curing system; under the irradiation of UV, the UV resin in the double-curing varnish forms free-radical polymerization under the action of the photoinitiator, and the -OH group contained in the hydroxy acrylic resin in the double-curing varnish and the -NCO group contained in the isocyanate resin in the curing agent are subjected to addition polymerization under the action of heat energy; and the polymers formed by the two polymerization reactions become an mutually-wound endosmosis network structure, thereby enhancing the weather resistance and chemical corrosion resistance of the paint film.

Description

technical field [0001] The present invention relates to a dual-curing varnish coating, and more particularly, the present invention relates to a two-component varnish coating that can be cured by ultraviolet light and heat. technical background [0002] Ultraviolet-curable coatings (UV coatings) have the advantages of rapid drying, high hardness, and short production cycles, and have been developed rapidly in recent years. However, traditional UV-curable coatings also have some defects, such as the contradiction between coating hardness and toughness. . The coating of UV-curable coatings is highly cross-linked, and it is easy to achieve high hardness, but the toughness cannot be guaranteed, so it cannot meet the application fields that require hardness and impact resistance. In addition, when the ultraviolet light is directly irradiated to the coating film to obtain sufficient radiation intensity, the cured coating film can achieve the best performance index. For the shadow...

AI Technical Summary

Problems solved by technology

[0002] Ultraviolet-curable coatings (UV coatings) have the advantages of rapid drying, high hardness, and short production cycles, and have been developed rapidly in recent years. However, traditional UV-curable coatings also have some defects, such as the contradiction between coating hardness and toughness.

The coating of UV-curable coatings is highly cross-linked, and it is easy to achieve high hardness, but the toughness cannot be guaranteed, so it cannot meet the application fields that require hardness and impact resistance

In addition, when the ultraviolet light is directly irradiated to the coating film to obtain sufficient radiation intensity, the cured coating film can achieve the best performance index. For the shadow parts that are not easily irradiated, sufficient radiation cannot be obtained. Light intensity

Furthermore, the weather resistance of the UV-cured coating film is insufficient, because all the photoinitiators cannot be ideally consumed when irradiated by ultraviolet light, and the remaining photoinitiators are stimulated by natural ultraviolet light to generate radicals, resulting in yellowing and deterioration of the coating film

The UV curing speed is fast (the curing time is measured in seconds), which can greatly shorten the curing time, but the reverse effect is that the residual stress of the coating film generated during curing is dozens of times larger than that of the heat-curing coating, which is easy to cause cracking of the coating film

Therefore, the application of UV-curable coatings in some fields is limited, especially the exterior surface coatings of automobiles and motorcycles that require high film performance.

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