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High-solid-content UV (Ultraviolet)-curing aqueous urethane acrylate dispersion liquid and preparation method thereof

A polyurethane acrylate, high solid content technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of increased consumption of photoinitiators, reduction of active ingredients in resins, slowing down of photocuring rate, etc., to achieve convenient practical application , Reduce water consumption, improve curing efficiency

Inactive Publication Date: 2011-04-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the water-based polyurethane currently on the market fails to solve the problem that the viscosity increases too much with the increase of solid content, and most of the solid content is below 40%.
However, the enthalpy of evaporation of water is relatively high, too much water makes it necessary to sacrifice energy for a faster drying and curing rate; it also reduces the effective components of the resin and increases the transportation cost; it is also easy to cause poor water resistance, incomplete drying, and formation Poor film has a series of problems such as pinholes
At the same time, O dissolved in water 2 There is a polymerization inhibition effect on the UV curing process, which increases the consumption of photoinitiators and slows down the photocuring rate

Method used

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  • High-solid-content UV (Ultraviolet)-curing aqueous urethane acrylate dispersion liquid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add 10.05g Boltorn in a four-necked flask equipped with mechanical stirring, condenser, thermometer and nitrogen inlet H20 hyperbranched polyester and 10.03g tetrahydrofuran, after the hyperbranched polyester is dissolved, add 4.49g maleic anhydride and 0.05g monoesterification catalyst 4-dimethylaminopyridine, and react in an oil bath at 50°C for 10 hours Stop the reaction to obtain reaction intermediate I; add 10.18g of isophorone diisocyanate and 0.01g of dibutyltin dilaurate to another reaction device, add dropwise 5.32g of hydroxyethyl acrylate, and react at 70°C for 5h, The reaction intermediate II was obtained; the reaction intermediate I was added dropwise to the reaction intermediate II, 0.01 g of dibutyltin dilaurate was added, and the reaction intermediate III was obtained after reacting at 80° C. for 6 h. After cooling to 30°C, 4.63g of triethylamine was added dropwise under stirring for neutralization for 30 minutes, then about 30g of deionized water was a...

Embodiment 2

[0035] Add 10.05g Boltorn in a four-necked flask equipped with mechanical stirring, condenser, thermometer and nitrogen inlet H20 hyperbranched polyester and 10.01g tetrahydrofuran, after the hyperbranched polyester is dissolved, add 10.15g phthalic anhydride and 0.05g monoesterification catalyst p-toluenesulfonic acid, react in an oil bath at 80°C for 5 hours, then stop the reaction , to obtain reaction intermediate I; add 4.01g of toluene diisocyanate and 0.01g of dibutyltin dilaurate to another reaction device, add dropwise 2.96g of hydroxyethyl methacrylate, and react at 50°C for 3h to obtain the reaction intermediate Body II; Add Reaction Intermediate I dropwise to Reaction Intermediate II, add 0.01g of dibutyltin dilaurate, and react at 60°C for 4h to obtain Reaction Intermediate III. After cooling to 30°C, 6.90g of triethylamine was added dropwise under stirring for neutralization for 30 minutes, then about 40g of deionized water was added to dilute, stirred at high sp...

Embodiment 3

[0037] Add 10.05g Boltorn in a four-necked flask equipped with mechanical stirring, condenser, thermometer and nitrogen inlet H30 hyperbranched polyester and 12.20g tetrahydrofuran, after the hyperbranched polyester is dissolved, add 2.88g succinic anhydride and 0.07g monoesterification catalyst 4-dimethylaminopyridine, react in an oil bath at 30°C for 12 hours, then stop the reaction , to obtain reaction intermediate I; add 14.41g hexahydrotoluene diisocyanate, 0.12g dibutyltin dilaurate to another reaction device, add dropwise 4.80g hydroxypropyl methacrylate, and react at 55°C for 3h to obtain Reaction intermediate II: Add reaction intermediate I dropwise to reaction intermediate II, add 0.11 g of dibutyltin dilaurate, and react at 65° C. for 6 hours to obtain reaction intermediate III. After cooling to 30°C, 11.13g of triethylamine was added dropwise under stirring for neutralization for 30 minutes, then about 40g of deionized water was added to dilute, stirred at high sp...

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Abstract

The invention discloses a high-solid-content UV-curing aqueous urethane acrylate dispersion liquid and a preparation method thereof, wherein the method comprises the following steps of: firstly carrying out the monoesterfication reaction on the partial hydroxide group at the tail end of hyperbranched polyester and the anhydride group of dicarboxylic anhydride to obtain an intermediate I; carrying out the end capping reaction on an isocyanate group in diisocyanate and the hydroxide group in a hydroxyalkyl methacrylate monomer to obtain a reaction intermediate II; carrying out the reaction on the residual hydroxide group of the intermediate I and the residual isocyanate group of the reaction intermediate II to obtain a reaction intermediate III; and carrying out alkali neutralization, aqueous dispersion and reduced-pressure distillation on the reaction intermediate III to remove an organic solvent to obtain the UV-curing urethane acrylate aqueous dispersion liquid. The dispersion liquid has the characteristics of high solid content, relatively low viscosity, UV curability, good mechanical performance of a paint film and the like, conforms to the concept of environmental protection, can be applied to the fields of environment-friendly coatings, aqueous ink, aqueous adhesives, fabric coating agents and the like and has broad prospect.

Description

technical field [0001] The invention relates to a water-based polyurethane dispersion liquid, in particular to a water-based polyurethane acrylate dispersion liquid with high solid content and UV curable properties and a preparation method thereof. Background technique [0002] Water-based polyurethane (WPU) is a high-performance water-based resin, which is currently a research hotspot at home and abroad. Compared with traditional solvent-based polyurethane, it not only retains some excellent properties of traditional solvent-based polyurethane, such as good wear resistance, flexibility, low temperature resistance and fatigue resistance, but also because it does not contain or only contains a small amount of Organic solvents have the advantages of being non-flammable, non-toxic, non-polluting, and energy-saving, and have become a green and environmentally friendly resin (Aqueous polyurethane dispersions. Colloid and Polymer Science, 1996, 274: 599-611). With the restriction...

Claims

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Application Information

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IPC IPC(8): C08G18/81C08G18/68C08G18/42C09D175/16
Inventor 曾幸荣尹文华李红强侯有军林晓丹任碧野童真刘润林
Owner SOUTH CHINA UNIV OF TECH
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