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Ultraviolet-curable aqueous polyurethane dispersion and preparation method thereof

A water-based polyurethane and dispersion technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of low crosslink density, low hardness, and low double bond content, and achieve excellent hardness, high crosslink density, and storage The effect of excellent stability

Inactive Publication Date: 2012-10-03
惠州市汉诺新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned patents have defects of low double bond content and low crosslinking density, which lead to defects such as poor water resistance, solvent resistance and mechanical properties, and low hardness after curing.
At the same time, due to the small molecular weight and poor storage stability, problems such as demulsification and delamination are prone to occur during storage.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]2000Ml three-neck flask, equipped with thermometer, stirring, heating and stirring device. Add 500 g of refined castor oil into the three-necked flask, stir and heat to 120±5°C. Vacuum dehydration for 60 minutes, cool down to 70°C, add 370.6 grams of IPDI (isophorone diisocyanate), maintain 80±5°C for 3 hours, cool to 60°C, add 300g of anhydrous acetone, drop the temperature to 45±5°C and add, Add 93g of methyldiethanolamine dropwise for 30min. After the dropwise addition, add 0.5g of organic bismuth catalyst and keep warm at 50±2°C for 3 hours. Add 56 g of dehydrated hydroxyethyl methacrylate, and react at 60±2°C for 2 hours until the reaction is complete (the absorption peak of NCO functionality at 2260-2280 cm-1 detected by infrared spectroscopy disappears to zero). Cool to 30±2°C, transfer the prepolymer to a 5L emulsification tank, add a mixed solution of 46g acetic acid and 1200g deionized water under high-speed stirring to obtain a water dispersion, distill off a...

Embodiment 2

[0037] 2000Ml three-neck flask, equipped with thermometer, stirring, heating and stirring device. Add 400g of refined castor oil into the three-necked flask, stir and heat to 120±5°C, vacuum dehydrate for 60min, add 18g of dehydrated pentylene glycol, cool to 70°C, add HMDI (dicyclohexylmethane diisocyanate, purity ≥99.5% ) 324.3 g, maintained at 82±2°C for 3 hours. Cool to 60°C, add 250g of anhydrous methyl ethyl ketone, drop the temperature to 45±5°C, add 99.8g of methyldiethanolamine dropwise, add dropwise for 30 minutes, and keep warm at 50±2°C for 3 hours after the dropwise addition. Add 100 g of dehydrated hydroxypropyl acrylate, 0.5 g of organic bismuth catalyst, and react at 60±2°C for 2 hours until the reaction is complete (the absorption peak of NCO functionality at 2260-2280 cm-1 detected by infrared spectroscopy disappears to zero). Cool to 30±2°C, transfer the prepolymer to a 5L emulsification tank, add a mixed solution of 49.2g acetic acid and 1600g deionized wa...

Embodiment 3

[0040] 2000Ml three-neck flask, equipped with thermometer, stirring, heating and stirring device. Add 600g of refined castor oil into the three-necked flask, stir and heat to 120±5°C, vacuum dehydrate for 60min, cool down to 70°C, add 20g of dehydrated 1,4-butanediol, add IPDI (isophorone diisocyanate) 419.3 grams, maintained at 82±2°C for 3 hours. Cool to 60°C, add 250g of anhydrous acetone, drop the temperature to 45±5°C, add 99.8g of methyldiethanolamine dropwise, add dropwise for 30 minutes, and keep warm at 50±2°C for 3 hours after the dropwise addition. Add 100 g of dehydrated hydroxypropyl acrylate, 0.5 g of organic bismuth catalyst, and react at 60±2°C for 2 hours until the reaction is complete (the absorption peak of NCO functionality at 2260-2280 cm-1 detected by infrared spectroscopy disappears to zero). Cool to 30±2°C, transfer the prepolymer to a 5L emulsification tank, add a mixed solution of 49.2g acetic acid and 1600g deionized water under high-speed stirring ...

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Abstract

The invention discloses an ultraviolet-curable aqueous polyurethane dispersion, also provides a preparation method of the ultraviolet-curable aqueous polyurethane dispersion and aims to provide an ultraviolet-curable aqueous polyurethane dispersion with a highly-branched structure, high double bond content and storage stability. The technical solution is that the dispersion is prepared by the following steps: 1), adding castor oil into a reactor, heating and dewatering the castor oil, cooling, adding polyisocyanate, heating till reaction begins, and thus obtaining a product A; 2), cooling theproduct A, adding a solvent A, dripping low molecular polyol with tertiary amino groups, and reacting to obtain a product B; 3), adding a vinyl monomer with hydroxyl and an organic metal catalyst into the product B, and reacting to obtain a product C; 4), uniformly mixing 30-100 parts of acid by weight and 1000-2000 parts of water by weight, dripping the mixture into the product C, removing the solvent, and thus obtaining a product D; and 5), adding a photoinitiator and methyl pyrrolidone into the product D to obtain the ultraviolet-curable aqueous polyurethane dispersion. The preparation method of the ultraviolet-curable aqueous polyurethane dispersion belongs to the technical field of preparation of chemical dispersion.

Description

technical field [0001] The invention relates to a dispersion system, specifically a light-curable aqueous polyurethane dispersion, and also relates to a preparation method of the dispersion system, which belongs to the technical field of chemical dispersion system preparation. Background technique [0002] UV curing technology has been widely used in polymer curing, and its characteristic is that the resin can change from a fluid state to a solid state after being irradiated with ultraviolet light at room temperature. Traditional UV curing systems generally consist of photoinitiators, oligomers containing unsaturated double bonds and reactive diluents. The main function of the diluent is to reduce the viscosity of the system, but it has a strong odor, and at the same time has a strong irritation to the senses and skin. With the increasing emphasis on safety and security, the application of this thinner should be gradually reduced or banned. In this case, a water-based ligh...

Claims

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Application Information

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IPC IPC(8): C08G18/67C08G18/32C08J3/09C08F283/00C09D175/16
Inventor 张卫东吕钱江
Owner 惠州市汉诺新材料有限公司
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