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Yellowing-resistant ultraviolet (UV) cured varnish

A technology of ultraviolet light and yellowing resistance, applied in the field of coatings, can solve the problems affecting the promotion of ultraviolet light-curing varnishes, the high cost of resin and initiators, and the influence of the coating on the aesthetics of products, and achieves high hardness, reduced equipment investment, high The effect of weather resistance

Inactive Publication Date: 2015-06-17
段晶晶
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second is the instability of the initiator itself. Some photoinitiators will produce some by-products when they are decomposed by ultraviolet radiation to generate free radicals. The by-products have a quinone structure or a strong rigid conjugated plane, which is easy to absorb Band of sunlight, so that the coating appears yellow
However, the yellowing of the coating seriously affects the aesthetics of the product and affects the promotion of UV-curable varnishes.
[0005] At present, some scholars are also studying to improve the yellowing resistance of light-cured coatings, and have achieved certain results, but there are still some problems: the cost of resins and initiators is too high, the yellowing resistance is only slightly improved, and it cannot meet the requirements of some high-end products. Also cannot be applied in actual production
At the same time, the method described by it is too complicated and has no practical significance
Moreover, in actual production, the way to increase the coating adhesion of plastic products is often to increase the resin with multifunctional groups to make it have better adhesion with the corresponding plastic products, but this will often introduce more conjugated structures, greatly reducing Yellow resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Hexafunctional fatty acid modified polyester acrylate 25%; tetrafunctional polyester acrylate 27%; tris(2-hydroxyethyl) isocyanurate 7%; trimethylolpropane triacrylate 10%; 2-methyl-1-[4-methylthiophenyl]-2-morpholinyl-1-propanone 3%; acetone 26%; BYK066N 1%, BYK333 1%.

Embodiment 2

[0024] Hexafunctional fatty acid modified polyester acrylate 21%; tetrafunctional polyester acrylate 22%; tris(2-hydroxyethyl) isocyanurate 8%; trimethylolpropane triacrylate 9%; 2-isopropylthioxanthone (mixture of 2,4 isomers) 2%; butanone 36%; BYK066N 1%, BYK333 1%.

Embodiment 3

[0026] Hexafunctional fatty acid modified polyester acrylate 24%; tetrafunctional polyester acrylate 23%; tris(2-hydroxyethyl) isocyanurate 5%; trimethylolpropane triacrylate 13%; 2-Isopropylthioxanthone (mixture of 2,4 isomers) 1%; Butyl acetate 32%; BYK066N 1%, BYK333 1%.

[0027]

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PUM

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Abstract

The invention relates to the field of paints, and specifically relates to a yellowing-resistant UV-cured varnish. The varnish is composed of the following components in percentage by weight: 20 to 30% of six-functionality aliphatic acid modified polyester acrylate, 20 to 30% of four-functionality polyester acrylate, 15 to 30% of monomer, 2 to 5% of photoinitiator, 25 to 40% of diluent, and 0.5 to 2% of functional aid. The provided UV-cured varnish has the advantages of low cost, good yellowing resistance, simple production, and easy industrialization.

Description

[0001] technical field [0002] The invention relates to the field of coatings, in particular to an anti-yellowing ultraviolet light curing varnish. [0003] Background technique [0004] UV-curable coatings are widely used in consumer electronics, auto parts, cosmetic packaging, and high-end wine bottles. However, the UV-curable coating itself has certain defects, which cause it to be easily yellowed, and the yellowing limits the application of the colorless photo-curable coating. There are two main reasons for yellowing. One is the yellowing of UV-curable coatings. This is because some resin systems contain some thermal (photo)chromic substances. After heating, the molecular structure changes, resulting in a stronger conjugated structure. Make the coating color yellow. The second is the instability of the initiator itself. Some photoinitiators will produce some by-products when they are decomposed by ultraviolet radiation to generate free radicals. The by-products have ...

Claims

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Application Information

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IPC IPC(8): C09D167/06C09D7/12
CPCC09D167/06C09D7/63C08L67/06C08K5/34924C08K5/103C08K5/378C08K5/45
Inventor 段晶晶
Owner 段晶晶
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