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Water-based uv photocuring coating and preparation method thereof

A light-curing paint, water-based technology, applied in the field of paint, can solve problems such as easy yellowing

Active Publication Date: 2018-03-20
CHINA ACADEMY OF ENG PHYSICS FUNCTION MATERIAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although water-based UV coatings are very popular, existing water-based UV coatings are prone to yellowing after curing

Method used

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  • Water-based uv photocuring coating and preparation method thereof
  • Water-based uv photocuring coating and preparation method thereof
  • Water-based uv photocuring coating and preparation method thereof

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preparation example Construction

[0062] In addition, also provide a kind of preparation method of above-mentioned waterborne UV photocurable coating, comprise the following steps:

[0063] Add a leveling agent, a defoamer and a photoinitiator to the urethane acrylate dispersion in sequence, stir and disperse evenly, and then filter with a 200-400-mesh filter cloth to obtain a water-based UV photocurable coating.

[0064] Wherein, the polyurethane acrylate dispersion is the first polyurethane acrylate dispersion or the second polyurethane acrylate dispersion.

[0065] The first urethane acrylate dispersion was urethane acrylate 2869-1 from Bayer AG, Germany.

[0066] The second urethane acrylate dispersion was prepared as follows:

[0067] S10. Under nitrogen protection, preheat isophorone diisocyanate at 70-80°C for 10-20 minutes, then add diol dropwise and stir for 2-3 hours, wherein the mass of diol and isophorone diisocyanate The ratio is 20-68:18-35.

[0068] S20. Next, add a hydrophilic chain extender...

Embodiment 1

[0076] Add 180 g of isophorone diisocyanate (IPDI) into a three-necked flask protected by nitrogen gas, and preheat at 70° C. for 10 min. Subsequently, 200 g of polycaprolactone diol (M=500 g / mol) polycarbonate diol was added dropwise into the reaction flask, stirred for 3 h, then 20 g of dimethylol propionic acid was added for 1 h, and the temperature was lowered to 55°C. Then, 30 g of hydroxyethyl methacrylate, 0.03 g of methoxyphenol and 1 g of dibutyltin dilaurate were added at the same time, kept for 5 hours and cooled to 40°C. Next, 15 g of triethylamine was added to adjust the pH to 7, and the material was discharged to obtain a colorless and transparent water-based polyurethane acrylate prepolymer. Take 41.5g of water-based urethane acrylate prepolymer and put it into the dispersion tank, add 0.1g of TX-10, stir evenly, add 58.3g of deionized water in batches to disperse evenly, and obtain the second urethane acrylate dispersion.

[0077] Take the second urethane acry...

Embodiment 2

[0082] Add 175 g of isophorone diisocyanate (IPDI) into a three-necked flask protected by nitrogen gas, and preheat at 80° C. for 10 min. Subsequently, 340 g of polycarbonate diol was added dropwise into the reaction flask, stirred and reacted for 2 h, and then 35 g of dimethylol butyric acid was added to react for 1.5 h, and the temperature was lowered to 65°C. Then, 55g of hydroxyethyl acrylate, 0.4g of methoxyphenol and 5g of dibutyltin dilaurate were added at the same time, the reaction was kept for 4 hours, and the temperature was lowered to 45°C. Next, 25 g of triethylamine was added to adjust the pH to 8, and the material was discharged to obtain a colorless and transparent water-based polyurethane acrylate prepolymer. Take 41.5g of water-based urethane acrylate prepolymer and put it into the dispersion tank, add 0.04g of TX-10, stir evenly, add 41.5g of deionized water in batches to disperse evenly, and obtain the second urethane acrylate dispersion.

[0083] Take 47....

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Abstract

The invention provides a water-based UV (ultraviolet) photocuring paint which comprises the following components in parts by weight: 80-95 parts of polyurethane acrylate dispersion, 0.1-2 parts of leveling agent, 0.1-2 parts of defoaming agent and 2-8 parts of photoinitiator. The polyurethane acrylate dispersion is a first polyurethane acrylate dispersion or second polyurethane acrylate dispersion. The first polyurethane acrylate dispersion is Bayer AG polyurethane acrylate 2869-1. The water-based UV photocuring paint has higher double bond curing rate and conversion rate; and after the water-based UV photocuring paint is stood for 6 months, the paint film basically does not become yellow. Besides, the invention also provides a preparation method of the water-based UV photocuring paint.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a water-based UV light-curing coating and a preparation method thereof. Background technique [0002] Photocurable coatings, also known as photosensitive coatings, use UV to trigger rapid polymerization and cross-linking of chemically active liquid materials, and instantly solidify into films. Water-based light-curing coatings have inherited and developed the advantages of traditional oil-based light-curing coating technology and water-based coating and ink technology. Because of their superior performance advantages such as environmental protection, wide application, safety, and relatively simple construction, they have quickly become a research hotspot. As an important part of water-based light-curing coatings, additives are also increasingly valued. Although water-based UV coatings are very popular, existing water-based UV coatings are prone to yellowing after curing. Contents of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/14C09D7/40C08G18/67C08G18/66C08G18/42C08G18/44C08G18/34
CPCC08G18/0823C08G18/34C08G18/4277C08G18/44C08G18/6659C08G18/672C09D7/40C09D175/14
Inventor 刘键姚志刚景梅贾学明
Owner CHINA ACADEMY OF ENG PHYSICS FUNCTION MATERIAL RES INST
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