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A high hardness uv curing water-based hardening film

A hardened film, high hardness technology, used in coatings, polyurea/polyurethane coatings, etc., can solve the problems of low performance of water-based UV coatings, and achieve the effects of less environmental pollution, increased crosslinking density, and enhanced hardness

Active Publication Date: 2021-09-07
HEFEI LUCKY SCI & TECH IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, compared with traditional solvent-based UV coatings, the performance of water-based UV coatings is lower than that of solvent-based UV coatings, which is mainly due to the inherent defects in the film-forming mechanism of water-based UV coatings.

Method used

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  • A high hardness uv curing water-based hardening film
  • A high hardness uv curing water-based hardening film
  • A high hardness uv curing water-based hardening film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045]

[0046] 28g of castor oil and 0.12g of p-toluenesulfonic acid monohydrate were added to the reactor, and then 10.86g of dimethylolpropionic acid was slowly added and the temperature was slowly raised to 150°C, while nitrogen was continuously fed to discharge water vapor. After 5 hours the nitrogen was turned off, the vacuum was maintained and the temperature was maintained for 2 hours. Add 21.74g of dimethylolpropionic acid and 0.21g of p-toluenesulfonic acid monohydrate, turn on the nitrogen, keep heating at a constant temperature for 5h, turn off the nitrogen and heat for another 2h to obtain a castor oil hyperbranched prepolymer. Finally, the acid value was measured by titration to be less than 12 mg KOH / mg. Take 14.07g of the above product, 1.84g of maleic anhydride, and 0.1g of 4-dimethylaminopyridine into the reactor, blow nitrogen into it, slowly raise the temperature to 60°C, and stir for 12h to obtain the product. Combine the above product with 19.74g poly...

Embodiment 2

[0050]

[0051] 28g of castor oil and 0.12g of p-toluenesulfonic acid monohydrate were added to the reactor, and then 10.86g of dimethylolpropionic acid was slowly added and the temperature was slowly raised to 150°C, while nitrogen was continuously fed to discharge water vapor. After 5 hours the nitrogen was turned off, the vacuum was maintained and the temperature was maintained for 2 hours. Add 21.74g of dimethylolpropionic acid and 0.21g of p-toluenesulfonic acid monohydrate, turn on the nitrogen, keep heating at a constant temperature for 5h, turn off the nitrogen and heat for another 2h to obtain a castor oil hyperbranched prepolymer. Finally, the acid value was measured by titration to be less than 12 mg KOH / mg. Take 14.07g of the above product, 1.11g of maleic anhydride, and 0.06g of 4-dimethylaminopyridine into the reactor, blow nitrogen into it, slowly raise the temperature to 60°C, and stir for 12h to obtain the product. Combine the above product with 22.37g of ...

Embodiment 3

[0055]

[0056] The synthesis of water-based castor oil hyperbranched polyurethane acrylate is the same as in Example 2.

[0057] Add 40g of water-based castor oil hyperbranched urethane acrylate (1.5 -COOH groups and 8.5 C=C functional groups) to 25g of water (15g of isopropanol and 10g of deionized water), then add 20g of bisphenol A diol Diacrylate EM3269 (manufactured by Taiwan Changxing Company) and 12 g of pentaerythritol hexaacrylate M600 (manufactured by Meiyuan Special Chemical Co., Ltd.) were stirred evenly. Continue to add 5g of polyether modified siloxane water-based leveling agent BYK348 (manufactured by Bicker Chemical), 4g of polyether siloxane copolymer defoamer TEGO Airex901W (manufactured by Evonik, Germany), 7g phenyl bis( 2,4,6-trimethylbenzoyl)phosphine oxide water-dispersed photoinitiator 819DW (manufactured by BASF, Germany), and stirred evenly to prepare a coating solution.

[0058] Use a wire bar coater to coat the coating solution on one side of a...

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Abstract

The invention relates to a high-hardness UV-curable water-based hardening film, which is formed by coating and curing water-based castor oil hyperbranched polyurethane acrylate UV paint. The coating solution is made of the following components by mass: water-based castor oil hyperbranched Polyurethane acrylate: 20-80; reactive diluent: 10-30; modified monomer: 10-30; water-based leveling agent: 0.05-5; defoamer: 0.05-1; water-based photoinitiator: 0.5-8 ; Water: 10-50. The product of the present invention is a water-based material, which has little environmental pollution and hardly produces volatile substances harmful to the human body; the present invention adjusts the ratio of maleic anhydride to polyurethane acrylate and adds different modified monomers to significantly improve the The crosslinking density of the material and the steric hindrance between the molecular chains can significantly enhance the hardness of the film, so that the hardness of the cured film can reach more than 5H, while the hardness of the cured film made by solvent-based UV coatings is usually 2H to 3H.

Description

technical field [0001] The invention relates to the field of films, in particular to a modified water-based hardening film. Background technique [0002] Ultraviolet (UV) curing refers to the chemical reaction of photosensitive substances in the system under the action of UV to produce active fragments, which initiates the polymerization reaction of active monomers and oligomers in the system, so that the coating can be cross-linked and cured in a short time reaction. UV curing coatings have developed rapidly due to their fast curing speed, room temperature operation, low energy consumption, excellent coating performance, and suitability for assembly line production. Traditional UV curing systems are mainly composed of photoinitiators, oligomers, reactive diluents, organic solvents and various additives. The organic solvent discharged into the atmosphere during paint manufacturing is about 20% of the paint weight, and the organic solvent volatilized into the atmosphere dur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/14C09D187/00C08G81/00C08G63/91C08G63/06
CPCC08G63/06C08G63/912C08G81/00C09D175/14C09D187/005
Inventor 韩捷徐倩倩刘玉磊李恒王巧
Owner HEFEI LUCKY SCI & TECH IND
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