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Water-based non-isocyanate polyurethane and preparation method thereof

A water-based non-isocyanate and non-isocyanate technology, used in polyurea/polyurethane coatings, coatings, etc., can solve problems such as threats, environmental pollution and human health, and achieve the effect of low VOCs

Inactive Publication Date: 2010-07-14
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the high VOCs (volatile organic compounds), solvent-based coatings have attracted more and more attention to environmental pollution and threats to human health. Many countries have issued relevant laws to limit the use of solvent-based coatings.

Method used

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  • Water-based non-isocyanate polyurethane and preparation method thereof
  • Water-based non-isocyanate polyurethane and preparation method thereof
  • Water-based non-isocyanate polyurethane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 30g of isopropanol to a four-neck flask equipped with mechanical stirring, reflux condenser, thermometer and ventilation tube, pass nitrogen gas for about 30min and heat to 80°C, then dropwise add the monomer mixture (methyl methacrylate 10.8g, Butyl acrylate 11.6g, methacrylic acid 1.8g, methacrylic acid cyclocarbonate 9.17g, AIBN: 2wt%, dodecyl mercaptan 5.7wt%), dripping within 1h. Insulate and react for 4 hours, cool down to 50-70°C, add triethylamine to neutralize to pH = 7-8, add deionized water to a solid content of about 35% at a stirring speed of 600rpm, keep warm at 50-60°C for 15-30min, and then Add 1.6g of ethylenediamine, react at 25°C for 4-10h, and discharge to obtain NIPU emulsion.

Embodiment 2

[0029] Add 30 g of ethanol to a four-necked flask equipped with mechanical stirring, reflux condenser, thermometer and ventilation tube, pass nitrogen gas for about 30 minutes and heat to 80 ° C, then dropwise add the monomer mixture (methyl methacrylate 13.8 g, butyl acrylate 13.77g of ester, 1.8g of methacrylic acid, 4g of methacrylic acid cyclocarbonate, AIBN: 2wt%, dodecyl mercaptan 7wt%), the drop was completed within 1.5h. Insulate and react for 4 hours, cool down to 50-70°C, add N,N-dimethylethanolamine to neutralize to pH = 7-8, add deionized water at a stirring speed of 400rpm until the solid content is about 35%, keep at 50-60°C After 15-30 minutes, the solvent ethanol was distilled off under reduced pressure, and the solid content was readjusted to about 35% with deionized water, then 1.35 g of hexamethylenediamine was added, reacted at 40°C for 4-10 hours, and the NIPU emulsion was obtained after discharging.

Embodiment 3

[0031] Add 30g of tetrahydrofuran into a four-necked flask equipped with mechanical stirring, reflux condenser, thermometer and ventilation tube, pass nitrogen gas for about 30min and heat to reflux, then dropwise add the monomer mixture (methyl methacrylate 10g, butyl acrylate 13.6 g, 3.3 g of hydroxyethyl methacrylate, 2.1 g of methacrylic acid, 4 g of methacrylic acid cyclocarbonate, AIBN: 1 wt %, dodecyl mercaptan 8 wt %), and drop it within 2 hours. Keep the reaction at 70°C for 6 hours, lower the temperature to 50-60°C, add triethanolamine to neutralize to pH=7-8, add deionized water at a stirring speed of 500rpm until the solid content is about 35%, keep at 50-60°C for 15-30min, Then add 1.7g of triethylenetetramine, react at 50°C for 4-10h, and discharge to obtain NIPU emulsion.

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Abstract

The invention provides water-based non-isocyanate polyurethane (NIPU) and a preparation method thereof. The water-based non-isocyanate polyurethane provided by the invention is water-dispersed or water-soluble resin prepared with cyclic carbonate functionalized prepolymer and dual or multi-element amino compounds. Compared with the traditional polyurethane, the water-based non-isocyanate polyurethane contains no isocyanate and thus has no toxicity. Therefore, the water-based non-isocyanate polyurethane can be used as film-forming resin for a water-based coating. The preparation method comprises the following steps: polymerization of one or a plurality of unsaturated monomer(s) containing cyclic carbonate groups and a hydrophilic unsaturated monomer through free radical solution, neutralization and emulsification for preparation of a water dispersion of cyclic carbonate functionalized prepolymer, and reaction of the water-dispersed cyclic carbonate functionalized prepolymer and a dual amino compound or a multi-element amino compound, thereby preparing the dispersion of the water-based non-isocyanate polyurethane (NIPU).

Description

technical field [0001] The invention belongs to the technical field of new chemical materials and relates to polyurethane (NIPU), in particular to water-based non-isocyanate polyurethane (NIPU) and a preparation method thereof. Background technique [0002] Polyurethane coatings have great advantages over other coatings in terms of temperature resistance, mechanical properties, weather resistance, anti-corrosion performance, decoration and gloss and color retention, so they are used in automotive coatings, furniture coatings, floor coatings, leather coatings, construction Coatings and anti-corrosion coatings and other fields have been widely used. Polyurethane coatings are one of the fastest-growing varieties in my country's coating industry, 80% of which are used for coating wood furniture and floors, accounting for about 75% of the entire wood coating market. However, the traditional polyurethane is obtained by the reaction of polyisocyanate and polyether polyol, which ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G71/00C09D175/04
Inventor 谭必恩黄耀成梁丽芸任旭
Owner HUAZHONG UNIV OF SCI & TECH
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