Preparation method of aqueous polyurethane dispersion and application of aqueous polyurethane dispersion

A water-based polyurethane and dispersion technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of non-combustibility, turbid coating film, and reduced physical and chemical properties of the paint film, and achieve simple preparation methods, good transparency, feel good effect

Inactive Publication Date: 2013-07-10
SHANGHAI WATERBASED CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The main chain of polyurethane macromolecules contains many carbamate groups, ether groups, ester groups, urea groups, amides and other groups. It is easy to form inter-molecular or intra-molecular hydrogen bonds between macromolecules, so polyurethane is a synthetic resin with excellent comprehensive properties. One, due to its variety of synthetic monomers, mild, specific and controllable reaction conditions, large room for formula adjustment and its microstructure (microscopic phase separation) characteristics of polymer materials, it can be widely used in coatings and adhesives , foam plastics, synthetic fibers and their elastomers have become one of the indispensable synthetic materials for people's clothing, food, housing, transportation and high-tech fields. Water-based polyurethane is a coating prepared with water as the dispersion medium, whic

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] In a sealed container with nitrogen protection, under stirring, 74.8 grams of isophorone diisocyanate was added dropwise to 51.3 grams of hydroxystyrene butadiene rubber, and stirred for 1.5 hours. After completion, the temperature was raised to 80 ° C, and 41.5 gram of dimethylolpropionic acid and 128.7 grams of polyether polyol (Mn about 1500), stirred for about 4 hours, lowered the temperature of the system to about 50°C, added 8.7 grams of triethylamine for neutralization reaction, and stirred for 0.5 After 1 hour, add about 580 grams of deionized water, increase the stirring rate to 800 rpm, and perform shear dispersion. Before the NCO is reduced to 2.1wt%, add 3.7 grams of ethylenediamine diluted with water to carry out the chain extension reaction After stirring for about 2 hours, an aqueous polyurethane dispersion with a solid content of about 34% was obtained.

[0058]Take 100 grams of polyurethane dispersion, add 2 grams of CX-100 (trimethylolpropane-tris[3-(2...

Embodiment 2

[0063] In a sealed container with nitrogen protection, under stirring, 51.6 grams of isophorone diisocyanate was added dropwise to 50.4 grams of hydroxystyrene-butadiene rubber, and stirred for 1.5 hours. After completion, the temperature was raised to 80 ° C, and 42.6 gram of dimethylolpropionic acid and 125.8 grams of polyether polyol (Mn about 1500), stirred for about 4 hours, lowered the system temperature to about 50°C, added 7.9 grams of triethylamine for neutralization reaction, stirred for 0.5 After 1 hour, add about 540 grams of deionized water, increase the stirring speed to 800 rpm, and carry out shear dispersion. Before the NCO is reduced to 1.3wt%, add 3.0 grams of ethylenediamine diluted with water to carry out the chain extension reaction After stirring for about 2 hours, an aqueous polyurethane dispersion with a solid content of about 34% was obtained.

[0064] Take 100 grams of polyurethane dispersion, add 2 grams of CX-100 (trimethylolpropane-tris[3-(2-methyl...

Embodiment 3

[0066] In a sealed container with nitrogen protection, under stirring, 87.1 grams of isophorone diisocyanate was added dropwise to 38.2 grams of hydroxystyrene butadiene rubber, and stirred for 1.5 hours. After completion, the temperature was raised to 80 ° C, and 58.2 gram of dimethylolpropionic acid and 147.5 grams of polyether polyol (Mn about 1500), stirred for about 4 hours, lowered the temperature of the system to about 50°C, added 9.2 grams of triethylamine for neutralization reaction, and stirred for 0.5 After 1 hour, add about 620 grams of deionized water, increase the stirring speed to 800 rpm, and perform shear dispersion. Before the NCO is reduced to 2.7wt%, add 3.7 grams of ethylenediamine diluted with water to carry out the chain extension reaction After stirring for about 2 hours, an aqueous polyurethane dispersion with a solid content of about 34% was obtained.

[0067] Take 100 grams of polyurethane dispersion, add 2 grams of CX-100 (trimethylolpropane-tris[3-...

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PUM

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Abstract

The invention discloses a preparation method of an aqueous polyurethane dispersion and application of the aqueous polyurethane dispersion. The preparation method of the aqueous polyurethane dispersion comprises the following steps of: adding an isocyanate monomer to a hydroxyl styrene butadiene rubber along with stirring under the protection of inert gas; reacting for 0.5 to 2 hours; heating to 70 to 90 DEG C; adding dimethylolpropionic acid and polyether polyol; reacting for 3 to 5 hours; cooling to 40 to 60 DEG C; adding triethylamine to carry out neutralization reaction for 0.1 to 2 hours; adding deionized water; shearing and dispersing at rotational speed of 700 to 900 revolutions per minute; and adding ethylenediamine to carry out chain extension for 1 to 3 hours, thus obtaining aqueous polyurethane dispersion. The aqueous polyurethane dispersion disclosed by the invention has the advantages that a butyl rubber fragment is introduced, thus a molecular chain can be separated in a microphase separation way, and the intramolecular extinction is caused accordingly, and as the result, the product has the automatic matte performance. A coating prepared through the aqueous polyurethane dispersion disclosed by the invention is high in transparency and great in hand feel.

Description

technical field [0001] The invention belongs to the technical field of polymer material polyurethane, and in particular relates to a preparation method of an aqueous polyurethane dispersion and an application of the aqueous polyurethane dispersion. Background technique [0002] The main chain of polyurethane macromolecules contains many carbamate groups, ether groups, ester groups, urea groups, amides and other groups. It is easy to form inter-molecular or intra-molecular hydrogen bonds between macromolecules, so polyurethane is a synthetic resin with excellent comprehensive properties. One, due to its variety of synthetic monomers, mild, specific and controllable reaction conditions, large room for formula adjustment and its microstructure (microscopic phase separation) characteristics of polymer materials, it can be widely used in coatings and adhesives , foam plastics, synthetic fibers and their elastomers have become one of the indispensable synthetic materials for peopl...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/66C08G18/48C08G18/62C09D175/08C09D7/12
Inventor 管新兵
Owner SHANGHAI WATERBASED CHEM CO LTD
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