One-component non-ionic polyurethane water dispersion

A non-ionic polyurethane, one-component technology, applied in the field of one-component non-ionic polyurethane water dispersion and its preparation, can solve the problems of unstable water-based polyurethane emulsion, high toxicity of polyurethane raw materials, cumbersome post-processing process, etc. Occupational hygiene problems, small particle size, good stability

Inactive Publication Date: 2016-06-01
CHINA PETROCHEMICAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the above-mentioned shortcoming of the prior art, the object of the present invention is to provide a kind of environment-friendly nonionic water-based polyurethane and preparation method thereof, to overcome the high toxicity of polyurethane raw materials in the prior art, the post-treatment process is loaded down with trivial details, and the water-based polyurethane emulsion does not stable defect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The method for preparing described one-component nonionic polyurethane water dispersion in the present embodiment may further comprise the steps:

[0052] 1) Preparation of polyurethane prepolymer: 98g of polyphenyl polymethylene polyisocyanate, 300g of polyoxypropylene diol with a molecular weight of 1000 and a moisture content of no more than 0.05wt% and 100g of polyethylene glycol monobutyl ether with a molecular weight of 2000 Put it into a reaction container and react at a reaction temperature of 70°C for 4 hours; after the content of the isocyanate group in the reaction container is stable, cool down to obtain a polyurethane prepolymer;

[0053] The content of the isocyanate group in the polyphenyl polymethylene polyisocyanate is 31.5wt%;

[0054] 2) Emulsification and dispersion: at a stirring speed of 2000r / min, add 1170g of deionized water to the polyurethane prepolymer;

[0055] 3) Chain extension reaction: Add 13g of ethylenediamine, and carry out chain exte...

Embodiment 2

[0057] The method for preparing described one-component nonionic polyurethane water dispersion in the present embodiment may further comprise the steps:

[0058] 1) Preparation of polyurethane prepolymer: 117g of diphenylmethane polyisocyanate, 20g of polyoxypropylene diol with a molecular weight of 400 and a moisture content of no more than 0.05wt%, and 250g of polyoxypropylene diol with a molecular weight of 1000 and a moisture content of no more than 0.05wt%. Propylene glycol and 74g of polyethylene glycol monobutyl ether with a molecular weight of 4000 are put into a reaction vessel for reaction, and the reaction temperature is 75° C. for 4 hours; after the content of the isocyanate group in the reaction vessel is stabilized, the polyurethane preform is obtained by cooling down. Polymer;

[0059] The content of isocyanate groups in the diphenylmethane polyisocyanate is 32wt%.

[0060] 2) Emulsification and dispersion: at a stirring speed of 2000r / min, add 790g of deionize...

Embodiment 3

[0063] The method for preparing described one-component nonionic polyurethane water dispersion in the present embodiment may further comprise the steps:

[0064] 1) Preparation of polyurethane prepolymer: 117g of organic polyisocyanate, 600g of polyoxypropylene glycol with a molecular weight of 2000 and a moisture content of no more than 0.05wt% and 126g of polyethylene glycol monobutyl ether with a molecular weight of 1000 were put into a reaction vessel for reaction. The reaction temperature is 75°C for 4 hours; after the content of the isocyanate group in the reaction vessel is stabilized, the polyurethane prepolymer is obtained by cooling down;

[0065] The organic polyisocyanate is selected from a mixture of polyphenyl polymethylene polyisocyanate and diphenylmethane diisocyanate, the viscosity of the mixture is 30mPa·s, and the isocyanate group content is 32wt%;

[0066] 2) Emulsification and dispersion: at a stirring speed of 3000r / min, add 977g of deionized water to th...

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Abstract

The present invention discloses a one-component non-ionic polyurethane water dispersion, which comprises the following raw materials by weight: an organic polyisocyanate, a polyether polyol, polyethylene glycol monomethyl ether, a chain extender, and water, wherein a molar ratio of the isocyanate group in the organic polyisocyanate to the active hydrogen in the polyether polyol is 1.2-1.5, the use amount of the polyethylene glycol monomethyl ether is 14-21 wt% of the total amount of the organic polyisocyanate, the polyether polyol and the polyethylene glycol monomethyl ether, the functionality of the isocyanate group in the organic polyisocyanate is more than 2, the polyether polyol is one or two selected from polyether diols, the molecular weight of the polyether polyol is 400-8000, the chain extender is an active hydrogen compound, and the chain extending coefficient is 0.80-0.95. According to the present invention, the one-component non-ionic polyurethane water dispersion has characteristics of no organic solvent, good water dispersion property, and good stability.

Description

technical field [0001] The invention relates to a polyurethane aqueous dispersion, in particular to a one-component nonionic polyurethane aqueous dispersion whose main structure is slightly cross-linked and a preparation method thereof. Background technique [0002] The full name of polyurethane is polyurethane, which is a polymer compound containing repeated carbamate groups in the main chain. It is formed by the addition polymerization of organic diisocyanate or polyisocyanate and dihydroxy or polyhydroxy compounds. A class of block-type high-performance polymer materials composed of hard and soft segments. [0003] A certain amount of hydrophilic groups are introduced into the polyurethane molecular chain, so that water can be used as a dispersion medium to obtain waterborne polyurethane. According to whether the polyurethane molecular chain contains ionic groups, that is, whether it is an ionomer, waterborne polyurethane can be divided into anionic, cationic, and nonion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/32C08G18/28C08G18/12
Inventor 宣理静方海燕蒋晓群沈立飞许耀新
Owner CHINA PETROCHEMICAL CORP
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