Preparation method and applications of aqueous polyurethane emulsion

A water-based polyurethane and emulsion technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as unclear application and poor performance, and achieve good overall performance, fast drying, and good water resistance.

Inactive Publication Date: 2015-03-11
JIANGSU ZHONGKE JINLONG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the previous patent, the patent application number CN201010565904.0 mentioned a water-based polyurethane coating prepared from polypropylene carbonate polyol, but its performance is poor, and its application is not clear. It is lacking in the preparation of industrial coatings ; The application number is that CN201110180540.9 mentions a kind of waterborne polyurethane fireproof coating prepared with polypropylene carbonate polyol; the application number is that CN201110180538.1 mentions a kind of waterborne polyurethane prepared with polypropylene carbonate polyol Adhesive; the application number is CN201310347297.4, which discloses a preparation of internal cross-linked polypropylene carbonate aqueous polyurethane emulsion, which improves performance, but there is still a big gap when used in hard coatings; therefore , it is very practical to prepare a waterborne polyurethane hard coating that can meet the requirements of industrialization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In the first step, 200Kg of a composite polyol (molecular weight 2500, hydroxyl value 45mg (KOH) / g) with a polycarbonate propylene structure accounting for 55% by mole and a polyoxypropylene ether structure accounting for 45% by mole was mixed with octanoic acid Add 0.4Kg of tin into the reaction kettle and stir evenly at 50°C; add 136Kg of toluene diisocyanate, raise the temperature to 70°C, and react for 2 hours; add 30Kg of 1,4-butanediol, and react for 1 hour at 80°C; add dihydroxy 20 Kg of methylpropionic acid, react at 80°C for 2 hours; cool down to 60°C, add 5 Kg of trimethylolpropane and 40Kg of acetone for 1.5 hours; cool down to 50°C, add 15Kg of triethylamine, and react for 15 minutes; Add 700Kg of water and disperse at high speed for 20 minutes; transfer the obtained emulsion to a precipitation kettle, raise the temperature to 50°C, and maintain a vacuum of 0.09Mpa to remove acetone; filter the material to obtain a translucent blue-light water-based polyureth...

Embodiment 2

[0029] In the first step, 200Kg of a composite polyol (molecular weight 2000, hydroxyl value 56mg (KOH) / g) with a polycarbonate propylene structure accounting for 70% by mole and a polyoxypropylene ether structure accounting for 30% by mole was mixed with dilaurel Add 0.2Kg of dibutyltin dibutyltin into the reaction kettle, stir evenly at 60°C; add 179Kg of isophorone diisocyanate, raise the temperature to 75°C, and react for 2 hours; add 38Kg of diethylene glycol, and react for 1 hour at 80°C Add 22 Kg of dimethylol butyric acid and react at 80°C for 2 hours; cool down to 60°C, add 3 Kg of trimethylolpropane and add 30Kg of acetone for 2 hours; cool down to 40°C, add 16.7Kg of triethylamine , react for 15 minutes; add 750Kg of water, disperse at high speed for 10 minutes; add ethylenediamine 10Kg, disperse at high speed for 30 minutes, transfer the obtained emulsion to a desolventization kettle, raise the temperature to 55°C, and maintain a vacuum of 0.09Mpa to remove acetone;...

Embodiment 3

[0034] In the first step, 200Kg of a composite polyol (molecular weight 3000, hydroxyl value 38 mg (KOH) / g) with a polycarbonate propylene structure accounting for 63% by mole and a polyoxypropylene ether structure accounting for 37% by mole was mixed with dilaurel Add 0.1Kg of dibutyltin nitrate and 0.1Kg of stannous octoate into the reaction kettle, and stir evenly at 60°C; add 162Kg of isophorone diisocyanate, raise the temperature to 80°C, and react for 1 hour; add 26Kg of ethylene glycol, and stir at 80°C React at low temperature for 1 hour; add 20 Kg of dimethylol propionic acid, react at 80°C for 2 hours; cool down to 50°C, add 2 Kg of diethylenetriamine and add acetone 30Kg for reaction for 1 hour; cool down to 40°C, add triethyl Add 15Kg of amine, react for 15 minutes; add 761Kg of water, disperse at high speed for 10 minutes; add 12Kg of isophorone diamine, disperse at high speed for 30 minutes, transfer the obtained emulsion to a precipitation kettle, raise the tempe...

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PUM

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Abstract

The invention discloses a preparation method and applications of an aqueous polyurethane emulsion. The aqueous polyurethane emulsion is mainly composed of the following components in parts by weight: 50 to 100 parts of composite polyol with a carbonate structure and an ether structure, 0.05 to 0.2 part of catalyst, 10 to 80 parts of isocyanate, 1 to 12 parts of crosslinking agent, 2 to 10 parts of hydrophilic chain extender, 0 to 15 parts of non-hydrophilic chain extender, 30 to 100 parts of acetone, 1 to 12 parts of neutralizer, 150 to 400 parts of deionized water, 0 to 25 parts of filling materials, 0 to 30 parts of pigment, and 0 to 15 parts of auxiliary agents. The hard paint has the characteristics of low film-forming temperature (0 DEG C or more), quick drying, strong adhesive force, scratch resistance, and impact resistance, has a pencil hardness of 2H, can be used to paint materials such as metal, woodware, glass, plastic, leather, and the like, and has the advantages of wide application range, high performance-cost ratio, and vase market prospect.

Description

technical field [0001] The invention relates to a preparation method of water-based polyurethane emulsion and its application in the field of coatings, belonging to the field of water-based polyurethane coatings. technical background [0002] Waterborne polyurethane is a polyurethane system in which water is used as the dispersion medium instead of the solvent. It not only has extremely low VOC, but also does not contain free -NCO. With people's emphasis on environmental protection, waterborne polyurethane has become an important direction for the development of polyurethane. Water-based polyurethane is used to prepare coatings, which can greatly reduce the damage of solvents in the coatings to the human body, reduce costs, and has the advantages of scratch resistance, wear resistance, and strong adhesion. Therefore, waterborne polyurethane is more and more popular for coatings. [0003] At present, there are not many single-component self-drying water-based polyurethanes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/44C08G18/12C09D175/06C09D175/08C09D7/12
CPCC08G18/0823C08G18/12C08G18/44C08G18/48C08G18/6674C08G18/6677C08G18/6692C09D175/08C08G18/3206C08G18/3228C08G18/3234C08G18/66C09D175/06C09D7/40
Inventor 徐玉华左志越张豪豪宗敬东林建新
Owner JIANGSU ZHONGKE JINLONG CHEM
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