Waterborne polyurethane emulsion and preparation method thereof

A water-based polyurethane and emulsion technology, which is applied in polyurea/polyurethane coatings, animal husbandry, chemical treatment of small raw hides/large raw hides/leather skins/furs, etc., can solve the problem of poor resistance to wet rubbing of the coating film, mechanical strength and gloss of the coating film No high problems, to achieve the effect of improving stability, excellent stability, improving mechanical properties and gloss

Inactive Publication Date: 2015-10-14
JINCHUANGJING NEW MATERIAL TECH SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Water-based polyurethane leather finishing agent is non-toxic, non-polluting, and has strong film-forming ability during use. It has excellent cold resistance, elasticity and comfortable handle. Hydrophilic groups such as O-, the formed coating film is not resistant to wet rubbing, and the mechanical strength and gloss of the formed coating film are not high

Method used

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  • Waterborne polyurethane emulsion and preparation method thereof
  • Waterborne polyurethane emulsion and preparation method thereof
  • Waterborne polyurethane emulsion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) 80 parts of polyneopentyl glycol adipate diol with a molecular weight of 2000, 4.5 parts of dimethylol propionic acid, 0 part of isosorbide, and 6 parts of N-methylpyrrolidone were vacuum dehydrated at 90 ° C for 1.5 ~2h, cool down to 80~90℃, add 27.8 parts of isophorone diisocyanate, react for 2.5~3h, until NCO% reaches the theoretical value, and obtain NCO-terminated polyurethane prepolymer;

[0029] (2) Lower the temperature of the system, add 3.3 parts of neutralizing agent triethylamine, and react at 60°C for 0.5h to obtain a hydrophilic water-based polyurethane prepolymer with a degree of neutralization of 95% to 100%;

[0030] (3) The obtained hydrophilic water-based polyurethane prepolymer is uniformly dispersed in 250 parts of deionized water under the high-speed shearing action of the mixer. After a period of time, a mixture of 3.1 parts of ethylenediamine and 20 parts of water is added dropwise to control The temperature of the system is 30-40°C. The emu...

Embodiment 2

[0032] (1) 80 parts of polyneopentyl glycol adipate diol with a molecular weight of 2000, 4.8 parts of dimethylol propionic acid, 1.3 parts of isosorbide, and 6 parts of N-methylpyrrolidone were vacuum dehydrated at 90 ° C for 1.5 ~2h, lower the temperature to 80~90℃, add 31.8 parts of isophorone diisocyanate, react for 2.5~3h, until NCO% reaches the theoretical value, and obtain NCO-terminated polyurethane prepolymer;

[0033] (2) Lower the temperature of the system, add 3.5 parts of neutralizing agent triethylamine, and react at 60°C for 0.5h to obtain a hydrophilic water-based polyurethane prepolymer with a degree of neutralization of 95% to 100%;

[0034] (3) The obtained hydrophilic water-based polyurethane prepolymer is uniformly dispersed in 265 parts of deionized water under the high-speed shearing action of the mixer, and after a period of time, a mixture of 3.5 parts of ethylenediamine and 20 parts of water is added dropwise to control The temperature of the system i...

Embodiment 3

[0036] (1) 80 parts of polyneopentyl glycol adipate diol with a molecular weight of 2000, 5.2 parts of dimethylol propionic acid, 4.0 parts of isosorbide, and 6 parts of N-methylpyrrolidone were vacuum dehydrated at 90 ° C for 1.5 ~2h, cool down to 80~90℃, add 40.1 parts of isophorone diisocyanate, react for 2.5~3h, until NCO% reaches the theoretical value, and obtain NCO-terminated polyurethane prepolymer;

[0037] (2) Lower the temperature of the system, add 3.8 parts of neutralizing agent triethylamine, and react at 60°C for 0.5h to obtain a hydrophilic water-based polyurethane prepolymer with a degree of neutralization of 95% to 100%;

[0038] (3) The obtained hydrophilic water-based polyurethane prepolymer is uniformly dispersed in 295 parts of deionized water under the high-speed shearing action of the mixer, and after a period of time, a mixture of 4.5 parts of ethylenediamine and 20 parts of water is added dropwise to control The temperature of the system is 30-40°C. ...

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Abstract

The invention discloses a waterborne polyurethane emulsion and a preparation method thereof. The preparation method comprises the following steps: firstly carrying out vacuum dehydration on polymer polyol, a hydrophilic chain extender, isosorbide and N-methyl pyrrolidone at 90 DEG C for 1-2 hours, reducing the temperature to 80-90 DEG C, adding diisocyanate and reacting for 2.5-3 hours until NCO% reaches the theoretical value; then reducing the temperature, adding a neutralizer to an NCO-terminated polyurethane prepolymer and reacting at 60 DEG C for 0.5 hour until the neutralization degree is 95-100%; finally dispersing the polyurethane prepolymer containing isosorbide into deionized water under the high-speed shearing action of an agitator and dropwise adding a mixture of diamine and water after dispersing for a period of time, thus obtaining the waterborne polyurethane emulsion. Isosorbide is successfully introduced into the waterborne polyurethane emulsion, thus obviously improving the glossiness of waterborne polyurethane films.

Description

technical field [0001] The invention belongs to the field of polyurethane finishing agents, and relates to a water-based polyurethane emulsion and a preparation method thereof. Background technique [0002] Leather finishing agent is an important leather chemical that improves the appearance, performance and economic value of leather. The finishing agent forms a uniform film on the leather surface, endowing the leather with excellent performance, such as solvent resistance, wet and dry rub resistance, water resistance and gloss. With the development of science and technology, people's demand for leather quality is getting higher and higher, and the quality of second leather depends to a large extent on the quality of leather finishing agent. Finishing agent gloss is an optical characteristic of the surface of the coating film, which is expressed by its ability to reflect light. The gloss of the coating film is the main index to measure the appearance quality of the coating...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/66C08G18/42C08G18/48C08G18/44C08G18/34C08G18/32C08G18/12C09D175/04C09D175/06C09D175/08C14C11/00
CPCC08G18/12C08G18/0823C08G18/664C08G18/6659C08G18/755C09D175/04C09D175/06C09D175/08C14C11/006C08G18/3228
Inventor 王贵友王雪莲景浩
Owner JINCHUANGJING NEW MATERIAL TECH SHANGHAI
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