Amino-terminated aqueous polyurethane dispersion and preparation method thereof

A technology of polyurethane dispersion and water-based polyurethane, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of increased molecular weight of water-based polyurethane, low molecular weight of water-based polyurethane, difficult cross-linking reaction, etc., to improve compatibility, mutual The effect of good permeability and simplified processing

Active Publication Date: 2014-12-17
上海巴德富实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the macromolecular chain of waterborne polyurethane, its end groups are mainly allophanate, urethane or alkyl, the reactivity of the above groups is extremely low, and they have high stability in the reaction system , so it is difficult for the above groups to react chemically with other functional groups
Due to the defect that the macromolecular chain of water-based polyurethane is difficult to undergo chemical reactions, it is difficult for the molecular chain of polyurethane to undergo cross-linking reaction in the reaction system, and it is very difficult to increase the molecular weight of water-based polyurethane.
The above situation has led to the low molecular weight of the existing water-based polyurethane, and the poor water resistance after the coating film is formed.

Method used

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  • Amino-terminated aqueous polyurethane dispersion and preparation method thereof

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preparation example Construction

[0032] The preparation method of amino-terminated aqueous polyurethane dispersion of the present invention comprises the following steps:

[0033] a: Weigh the raw materials according to the above ratio for later use;

[0034] b: Add polyether polyol, small molecule chain extender, and hydrophilic chain extender into the reactor, react at normal pressure and 100-120°C for 0.5-2 hours, and vacuumize and dehydrate;

[0035] c: Lower the temperature in the reactor to 40-80°C, add isocyanate until the reaction is complete;

[0036] d: filling nitrogen into the mixture in step c, and adding an oxidizing agent, and reacting at 50-70° C. for 1-3 hours.

[0037] e: Stir the mixture obtained in step d continuously at 40-60°C, add water to gradually disperse it, and add polyamine chain extender under the protection of nitrogen, and react for 2-6 hours;

[0038] f: Stir the mixture obtained in step e at 30-50° C. at a speed of 200-500 rpm for 2-5 hours to disperse the mixture uniformly...

Embodiment 1

[0042] The amino-terminated aqueous polyurethane dispersion of the present invention comprises water, toluene diisocyanate, hexamethylene diisocyanate, polyoxypropylene glycol, 1,4-butanediol, dimethylol propionic acid, ethylenediamine and concentrated sulfuric acid , the contents of the above components are calculated in parts by mass: water: 100 parts; toluene diisocyanate: 20 parts; hexamethylene diisocyanate: 10 parts; polyoxypropylene glycol: 10 parts; Alcohol: 5 parts; Dimethylol propionic acid: 5 parts; Ethylenediamine: 5 parts; Concentrated sulfuric acid: 1 part.

[0043] The preparation method of hydroxyl-terminated water-based polyester resin of the present invention comprises the following steps:

[0044] a: Weigh the raw materials according to the above ratio for later use;

[0045] b: Add polyoxypropylene glycol, 1,4-butanediol, and dimethylol propionic acid into the reaction kettle, react at normal pressure and 100°C for 0.5 hours, and vacuumize and dehydrate;

...

Embodiment 2

[0052] The amino-terminated aqueous polyurethane dispersion of the present invention comprises water, hexamethylene diisocyanate, isophorone diisocyanate, polytetramethylene ether glycol, 1,6-hexanediol, ethylene glycol, trimethylol propane, dimethylolpropionic acid, diethylenetriamine, isophoronediamine and sulfur trioxide, the contents of the above components are calculated in parts by mass: water: 100 parts; hexamethylene diisocyanate: 10 parts; isophorone diisocyanate: 25 parts; polytetramethylene ether glycol: 13 parts; 1,6-hexanediol: 3 parts; ethylene glycol: 3 parts; trimethylolpropane: 3 parts dimethylolpropionic acid: 8 parts; diethylenetriamine: 3 parts; isophoronediamine: 4 parts; sulfur trioxide: 2 parts.

[0053] The preparation method of hydroxyl-terminated water-based polyester resin of the present invention comprises the following steps:

[0054] a: Weigh the raw materials according to the above ratio for later use;

[0055] b: Add polytetramethylene ether g...

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Abstract

The invention discloses an amino-terminated aqueous polyurethane dispersion. The amino-terminated aqueous polyurethane dispersion comprises, by mass, 100 parts of water, 30-50 parts of isocyanate, 10-20 parts of polyether polyol, 5-20 parts of a micro-molecular chain extender, 5-15 parts of a hydrophilic chain extender, 5-15 parts of a polyamine chain extender and 1-5 parts of an oxidant. The amino-terminated aqueous polyurethane dispersion has the advantages of high hardness, good wear resistance and excellent water resistance.

Description

[0001] technical field [0002] The invention relates to a water-based polyurethane and a preparation method thereof, in particular to an amino-terminated water-based polyurethane dispersion and a preparation method thereof. [0003] Background technique [0004] At present, water-based polyurethane is favored by water-based paint manufacturers for its advantages of high hardness, low film-forming temperature, good flexibility, and good wear resistance, and is widely used in water-based wood paints, water-based industrial paints and other fields. However, in the macromolecular chain of waterborne polyurethane, its end groups are mainly allophanate, urethane or alkyl, the reactivity of the above groups is extremely low, and they have high stability in the reaction system , so it is difficult for the above groups to react chemically with other functional groups. Due to the defect that the macromolecular chain of waterborne polyurethane is difficult to undergo chemical reacti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C09D175/08C08G18/48C08G18/32
CPCC08G18/3228C08G18/3234C08G18/6674C08G18/6685C08G18/6692C08G18/724C08G18/73C08G18/7614C09D175/08
Inventor 曾庆乐杨文涛
Owner 上海巴德富实业有限公司
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