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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 reduced active components of resin, increased consumption of photoinitiators, poor film formation and pinholes, etc., to achieve water The effect of reducing dosage, facilitating practical application, and saving transportation costs

Inactive Publication Date: 2012-08-08
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 to 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, react in 50℃ oil bath for 10 hours Stop the reaction to obtain reaction intermediate I; add 10.18g isophorone diisocyanate and 0.01g dibutyl tin dilaurate to another reaction device, add 5.32g hydroxyethyl acrylate dropwise, and react at 70°C for 5h, The reaction intermediate II is obtained; the reaction intermediate I is added dropwise to the reaction intermediate II, 0.01 g of dibutyltin dilaurate is added, and the reaction is conducted at 80° C. for 6 hours to obtain the reaction intermediate III. After cooling to 30°C, 4.63g of triethylamine was added dropwise to neutralize with stirring for 30 minutes, then about 30g of deionized water was added to dilute, st...

Embodiment 2

[0035] Add 10.05g Boltorn to 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 80℃ oil bath for 5 hours, then stop the reaction , Get reaction intermediate I; add 4.01g toluene diisocyanate, 0.01g dibutyl tin dilaurate, drop 2.96g hydroxyethyl methacrylate, and react at 50℃ for 3h to obtain reaction intermediate Body II: Add reaction intermediate I dropwise to reaction intermediate II, add 0.01 g of dibutyl tin dilaurate, and react at 60° C. for 4 hours to obtain reaction intermediate III. Then cool to 30°C, add 6.90g triethylamine dropwise under stirring to neutralize for 30 minutes, then add about 40g deionized water for dilution, stir at high speed for 40 minutes, distill under reduced pressure to remove tetrahydrofuran, and ob...

Embodiment 3

[0037] Add 10.05g Boltorn to 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 30℃ oil bath for 12 hours and then stop the reaction , Get reaction intermediate I; add 14.41g hexahydrotoluene diisocyanate, 0.12g dibutyl tin dilaurate to another reaction device, drop 4.80g hydroxypropyl methacrylate, react at 55℃ 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 to neutralize with stirring for 30 minutes, then about 40g of deionized water was added to dilute, stirred at high speed for 40 minutes, and tetrahyd...

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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; carryingout 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 liquidhas 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 an aqueous polyurethane dispersion, in particular to a high-solid content UV-curable aqueous polyurethane acrylate dispersion and a preparation method thereof. Background technique [0002] Water-based polyurethane (WPU) is a high-performance water-based resin, which is currently a research focus at home and abroad. Compared with traditional solvent-based polyurethane, it not only retains some of the excellent properties of traditional solvent-based polyurethane, such as good wear resistance, flexibility, low temperature resistance and fatigue resistance, but also contains no or only a small amount of Organic solvents have the advantages of being non-flammable, non-toxic, not polluting the environment, saving energy, etc., and become a green and environmentally friendly resin (Aqueous polyurethane dispersions. Colloid and Polymer Science, 1996, 274: 599-611). With national environmental regulations restricting volatile organic comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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