Photoinitiator composition suitable for UV-LED light source

A technology of UV-LED and photoinitiator, which is applied in the direction of coating, etc., can solve the problems of unsatisfactory curing effect, large amount of photoinitiator, and poor surface drying, etc., to achieve high initiating activity, long light absorption wavelength, and small dosage Effect

Active Publication Date: 2018-01-12
TIANJIN JIURI NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the wavelengths of UV-LED light sources are mainly 385nm, 395nm, and 405nm. Conventional initiators rarely match them. Everyone encounters a common problem when UV-LED light curing: the surface is not dry enough, This is also closely related to the selection of photoinitiators in the specific photocuring formula system, so it is particularly urgent to introduce a high-efficiency photoinitiator suitable for UV-LED light sources.
Although the current formula design can barely meet the requirements of UV-LED light sources, the general amount of photoinitiator used is very large, which causes pressure on the cost. If the amount of photoinitiator is reduced, the curing effect is not ideal

Method used

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  • Photoinitiator composition suitable for UV-LED light source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Photoinitiator composition A: isopropylthioxanthone+methyl benzoylformate+2,4,6-trimethylbenzoyl-diphenylphosphine oxide

[0043] Add 1g of isopropylthioxanthone and 1g of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide into 2g of methyl benzoylformate and ultrasonically dissolve to form photoinitiator composition A , and then formulated into a photopolymerization system according to Table 1, coated on a glass sheet with a wire bar coater, and exposed according to the conditions in Table 2 to obtain a photocurable coating material.

[0044] Table 1: Specific composition and ratio of photocuring system

[0045]

[0046] Table 2: Coating Thickness and Exposure Conditions

[0047]

[0048] The obtained light-cured coating was well cured overall, had no peculiar smell, had a smooth and uniform surface, and had a pencil hardness of 2H, indicating that the photoinitiator composition A had good photoinitiation activity for a film thickness coating of 22 μm under a 395nm ...

Embodiment 2

[0050] Photoinitiator composition B: 2,4-diethylthioxanthone + methyl benzoylformate + ethyl 2,4,6-trimethylbenzoylphosphonate

[0051] Add 1g of 2,4-diethylthioxanthone and 1g of ethyl 2,4,6-trimethylbenzoylphosphonate into 2g of methyl benzoylformate and ultrasonically dissolve to form a photoinitiator combination Matter B, then formulate a photopolymerization system according to Table 3, apply it on a glass sheet with a wire bar coater, and expose according to the conditions in Table 2 to obtain a photocurable coating material.

[0052] Table 3: Specific composition and ratio of photocuring system

[0053]

[0054] The obtained photocurable coating was well cured overall, with almost no peculiar smell, smooth and uniform surface, and a pencil hardness of 2H, indicating that the photoinitiator composition B had good photoinitiation activity for a film thickness coating of 22 μm under a 395nm LED light source.

Embodiment 3

[0056] Photoinitiator composition B: 2,4-diethylthioxanthone + methyl benzoylformate + ethyl 2,4,6-trimethylbenzoylphosphonate

[0057] Add 1g of 2,4-diethylthioxanthone and 1g of ethyl 2,4,6-trimethylbenzoylphosphonate into 2g of methyl benzoylformate and ultrasonically dissolve to form a photoinitiator combination Matter B, then formulate a photopolymerization system according to Table 3, apply it on a glass sheet with a wire bar coater, and expose according to the conditions in Table 4 to obtain a photocurable coating material.

[0058] Table 4: Coating Thickness and Exposure Conditions

[0059]

[0060] The obtained light-cured coating was well cured overall, with almost no peculiar smell, smooth and uniform surface, and a pencil hardness of 2H, indicating that the photoinitiator composition B had good photoinitiation activity for a film thickness coating of 22 μm under a 385nm LED light source.

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Abstract

The invention aims to provide a photoinitiator composition suitable for a UV-LED light source. The photoinitiator composition is a photocuring composition composed of thioxanthone photoinitiator, benzoyl methyl formate and acyl phosphine oxide photoinitiator according to a ratio of 1-2:1-2:2-4. The photoinitiator composition has quite high photoinitiation efficiency under the UV-LED light source and can greatly improve the problem of bad surface drying which is common at present. The invention aims to further provide a photocuring composition with excellent performance. The photocuring composition comprises 20-40% of epoxy acrylate, 5-20% of acrylic resin containing tertiary amine structure, 20-60% of active diluent, 1-5% of photoinitiator composition, 0.5-1% of auxiliary and 0-30% of pigment.

Description

technical field [0001] The invention belongs to the field of radiation curing composition and its application to the field of UV-LED light source packaging printing ink and coating, and in particular relates to a high activity photoinitiator composition and a photocuring composition contained therein. Background technique [0002] In recent years, with the strengthening of environmental protection awareness, people have higher and higher environmental protection requirements for the chemical industry, especially for the control of VOC in the coating and ink industry. Due to the excessive VOC in traditional coatings, it is gradually listed as a high-pollution industry, and the transformation of enterprises is imminent. At present, the relatively environmentally friendly coating transformation directions that everyone recognizes are powder coatings, UV coatings, and water-based coatings. Among them, UV coatings have been recognized by everyone for their advantages of high effi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/48C09D4/06C09D4/02
Inventor 董月国姚娜张燕张文静王晓蒙赵国辉张齐
Owner TIANJIN JIURI NEW MATERIALS CO LTD
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