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Degradable aqueous polyurethane dispersion and preparation method thereof

A polyurethane water dispersion, polyurethane technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problem of increasingly prominent waste disposal problems, and achieve improved degradable performance and hygienic performance, strong water resistance, and simple operation. Effect

Inactive Publication Date: 2010-06-02
SHANGHAI WEIKAI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The development of waterborne polyurethane has solved the design safety and health problems brought about by solvent coating, but the waste disposal problem of a large number of polyurethane applications has become increasingly prominent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of preparation method of degradable polyurethane aqueous dispersion is characterized in that, the method comprises the following steps:

[0039] (1) Prepare materials according to the following components and parts by weight: 11kg polycaprolactone diol (molecular weight 2000), 2.5kg soybean oil, 22kg isophorone diisocyanate, 6kg hydrophilic chain extender dimethylol propionic acid , 2kg collagen, 4.4kg neutralizer triethylamine, 45kg acetone, 150kg deionized water;

[0040] (2) After mixing polycaprolactone diol and soybean oil, dehydrate under reduced pressure at 120°C for 1.5h, then cool down to 60°C, add isophorone diisocyanate and heat up to 90°C, and react until the isocyanate of the solution The amount of cyanate (NCO) reaches 6% (wt%);

[0041] (3) Add the hydrophilic chain extender dimethylolpropionic acid to the product obtained in step (2), and react until the amount of isocyanate (NCO) in the solution reaches 4% (wt%);

[0042] (4) Add collagen and a...

Embodiment 2

[0047] A kind of preparation method of degradable polyurethane aqueous dispersion is characterized in that, the method comprises the following steps:

[0048] (1) Prepare materials according to the following components and parts by weight: 5.5kg polycarbonate diol (molecular weight 1000), 5kg castor oil, 20kg isophorone diisocyanate, 5kg hydrophilic chain extender dimethylol propionic acid, 1kg collagen, 3.5kg neutralizer triethylamine, 50kg acetone, 140kg deionized water;

[0049] (2) After mixing polycarbonate diol and castor oil, dehydrate under reduced pressure at 120°C for 1.5h, then cool down to 60°C, add isophorone diisocyanate and heat up to 90°C, and react until the NCO content of the solution Up to 7% (wt%);

[0050] (3) adding hydrophilic chain extender dimethylolpropionic acid to the product obtained in step (2), reacting until the NCO amount of the solution reaches 6% (wt%);

[0051] (4) Add collagen and acetone to the product obtained in step (3), and react unt...

Embodiment 3

[0056] (1) Prepare materials according to the following components and parts by weight: 15kg polycaprolactone diol (molecular weight 2000), 8kg polycarbonate diol (molecular weight 1000), 18kg toluene diisocyanate, 6.5kg hydrophilic chain extender dihydroxy Methylbutyric acid, 1.5kg collagen, 4.0kg neutralizing agent methyldiethanolamine, 48kg acetone, 175kg deionized water;

[0057] (2) After mixing polycaprolactone diol and polycarbonate diol, dehydrate under reduced pressure at 120°C for 1.5h, then cool down to 60°C, add toluene diisocyanate and heat up to 80°C, and react until the NCO of the solution The amount reaches 4% (wt%);

[0058] (3) Add the hydrophilic chain extender dimethylol butyric acid to the product obtained in step (2), and react until the NCO amount of the solution reaches 2% (wt%);

[0059] (4) Add collagen and acetone to the product obtained in step (3), and react until the NCO amount of the solution reaches 1% (wt%) at the acetone reflux temperature of...

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Abstract

The invention relates to degradable aqueous polyurethane dispersion and a preparation method thereof. The dispersion comprises the following components in part by weight: 10 to 30 parts of polyol, 15 to 25 parts of diisocyanate, 3 to 8 parts of hydrophilic chain-extender, 1 to 3 parts of collagen, 3 to 5 parts of neutralizer, 45 to 55 parts of acetone, and 140 to 180 parts of deionized water. Themethod comprises the following steps: dehydrating the polyol under reduced pressure; adding the diisocyanate, the hydrophilic chain-extender, the collagen and the acetone into the polyol; reacting the mixture until the isocyano amount reaches a theoretical value; adding the neutralizer and the deionized water into the solution after the solution is cooled; and distilling the product to obtain thedegradable aqueous polyurethane dispersion. Compared with the prior art, the degradable aqueous polyurethane dispersion has the advantages of reasonable synthesis route, simple operation, high product stability, high water resistance, good degradability and sanitary performance, and can be used for package paint of foods, medicaments, cigarettes and other products.

Description

technical field [0001] The invention relates to a polyurethane aqueous dispersion and a preparation method thereof, in particular to a degradable polyurethane aqueous dispersion and a preparation method thereof. Background technique [0002] Polyurethane materials are widely used in production and life due to their excellent mechanical strength, high elasticity, wear resistance, and biocompatibility. The development of waterborne polyurethane has solved the design safety and health problems brought about by solvent coating, but the waste disposal problem of a large number of polyurethane applications has become increasingly prominent. Therefore, degradable materials complying with environmental protection requirements must be an important direction of future development. Contents of the invention [0003] The object of the present invention is to provide an environmentally friendly, degradable, safe and degradable aqueous polyurethane dispersion and a preparation method t...

Claims

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Application Information

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IPC IPC(8): C08G18/67C08G18/66C08G18/64C08G18/44C08G18/48C08G18/42C08G18/10C08J3/03C09D175/04C09D175/08C09D175/06C09D175/14
Inventor 邓庆仪朱先义戴炜枫刘杰
Owner SHANGHAI WEIKAI CHEM
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