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Process for preparing ultraviolet curable aqueous polyurethane resin

A water-based polyurethane and ultraviolet light technology, which is applied in the field of polyurethane coatings and adhesives, can solve the problems of no improvement in methyl ethyl ketone wiping performance, failure to improve methyl ethyl ketone wiping performance, and reduced hard segment content, so as to improve methyl ethyl ketone wiping performance and improve storage The effect of high stability and cross-linking density

Inactive Publication Date: 2008-02-13
UNIV OF SCI & TECH OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese Patent Application No. 200410063171.5 proposes a method for the preparation of UV-curable water-based polyurethane resin, which uses soft segment unsaturated polyester acrylate containing double bonds to introduce double bonds into polyurethane molecular chains, because this method is increasing the content of double bonds When the hard segment content will be reduced accordingly, the hardness of the obtained coating will not increase, and it is only suitable for soft touch coatings; its resistance to methyl ethyl ketone wiping performance has not improved, and the UV-cured coating with a wet film thickness of 30 microns will not penetrate The maximum number of double friction is only 91 times
[0004] The above-mentioned prior art either introduces double bonds in the soft segment but reduces the content of the hard segment, which cannot improve the resistance to methyl ethyl ketone wiping; or the introduced double bond content is limited, and the hardness of the resulting coating is not high

Method used

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  • Process for preparing ultraviolet curable aqueous polyurethane resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 36.7 grams of PTMG into a 500ml three-necked flask, dehydrate at 100°C for 1.5 hours, add 47.9 grams of IPDI, stir and react at 100°C for 2 hours, add 6.5 grams of hydrophilic chain extender DA, and stir at 90°C for 2 After one hour, add 22 grams of acetone, 45 grams of pentaerythritol tetraacrylate, 2.8 grams of p-methoxyphenol and 0.073 grams of dibutyltin dilaurate, and stir and react at 80°C for 2 hours, then add 6 grams of HEA, After stirring and reacting at 70°C for 2 hours, transfer the polyurethane resin into a high-speed shear disperser, add 5 grams of triethylamine at 800 rpm and 40°C, and react for 1 minute, then add 272 grams of water, and after 5 minutes , to obtain a UV-curable water-based polyurethane resin emulsion; transfer it to a rotary evaporator, remove acetone at 40°C and -0.1MPa vacuum conditions, and obtain a UV-curable water-based polyurethane resin.

[0021] The structure of the polyurethane resin can be characterized by infrared spectrum. ...

Embodiment 2

[0024] Add 35.8 grams of PJ into a 500ml three-neck flask, dehydrate at 110°C for 1 hour, add 75.5 grams of MDI, stir and react at 80°C for 4 hours, add 12.3 grams of hydrophilic chain extender DA, and stir at 60°C for 4 After 1 hour, add 55 grams of methyl ethyl ketone, 36.6 grams of PEDA, 0.09 grams of hydroquinone and 0.018 grams of dibutyltin dilaurate, stir and react at 50 ° C for 4 hours, add 12 grams of HPA, and stir and react at 50 ° C for 3 hours , put it into a high-speed shear disperser, add 9.5 grams of triethylamine at 2000 rpm and 30 ° C, react for 2 minutes, add 418 grams of water, and after 1 minute, the UV-curable water-based Polyurethane resin emulsion; transfer to a rotary evaporator, remove acetone at 50°C and 0.09MPa vacuum to obtain a UV-curable waterborne polyurethane resin.

[0025] The structural characterization of the polyurethane resin is the same as in Example 1.

Embodiment 3

[0027] Add 95 kg of PCD and HTTP mixture into a 50L reactor, dehydrate at 120°C for 0.5 hours, add 64.8 kg of TDI, react at 90°C for 3 hours, add 8 kg of hydrophilic chain extender DA, at 80°C After reacting at ℃ for 1 hour, add 58.5 kg of acetone, 31.1 kg of TMPME, 3 kg of BHT and 0.069 kg of dibutyltin dilaurate. After stirring and reacting at 65°C for 3 hours, add 22.4 kg of PETA and react at 60°C for 2.5 hours. Transfer to a high-speed shearing disperser, add 6.5 kg of triethylamine at 4000 rpm and 20°C, react for 3 minutes, add 342 kg of water, and after 3 minutes, a UV-curable water-based polyurethane resin emulsion is obtained.

[0028] Transfer it to a solvent removal kettle, and remove acetone under 60°C and 0.08MPa vacuum conditions to obtain a UV-curable water-based polyurethane resin. The structural characterization of the polyurethane resin is the same as in Example 1.

[0029] If the other conditions of this embodiment remain unchanged, and PCD or HTTP is replac...

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Abstract

This invention is the preparation method of ultraviolet light stabilized polyurethane resin with aquosity. The procedure is as followings: add diatomic alcohol with isoallyl group, solvent, polymerization inhibitor and catalysis into polyurethane. React at 50-80deg C for 2-4hours. Add hydroxyethyl methacrylate to react at 50-70deg C for 2-3hours. Use diatomic alcohol with isoallyl group to amplify the NCO group and polyurethane pre-polymer. Then cap with hydroxyethyl methacrylate to add acroleic acid double bond into polyurethane's branch chain and chain ends. With this method, polyurethane is NCOgroup-free. It helps increase the emulsion's storage stability. This invention increase the product's double bonds contents as well as hard block contents to lift crosslinking density, coating hardness and resistance of wiping with methyl-ethyl ketone.

Description

Technical field: [0001] The invention belongs to the technical field of polyurethane coatings and adhesives, in particular to a preparation method of an ultraviolet (UV) curable waterborne polyurethane resin used for a hard coating. Background technique: [0002] UV-curable waterborne polyurethane resin is widely used in the field of coatings because of its good comprehensive performance and outstanding environmental protection. Chinese Patent Application No. 200410063171.5 proposes a method for the preparation of UV-curable water-based polyurethane resin, which uses soft segment unsaturated polyester acrylate containing double bonds to introduce double bonds into polyurethane molecular chains, because this method is increasing the content of double bonds When the hard segment content will be reduced accordingly, the hardness of the obtained coating will not increase, and it is only suitable for soft touch coatings; its resistance to methyl ethyl ketone wiping performance ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/10C08G18/83C08G18/40C08G18/76C08K5/13
Inventor 戴家兵张兴元白晨艳于子洲
Owner UNIV OF SCI & TECH OF CHINA
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