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Preparation method of polyurethane aqueous dispersion and waterborne polyurethane paint containing polyurethane aqueous dispersion

A polyurethane water dispersion and polyurethane technology, applied in polyurea/polyurethane coatings, polyurea/polyurethane adhesives, coatings, etc., can solve the problem of reducing the water resistance of PUD film in chemical media, reducing the wear resistance of polyurethane materials Solve problems such as cold resistance and limited improvement of emulsion curing amount, achieve good storage stability, improve film-forming performance, improve gloss and decorative performance

Active Publication Date: 2012-08-08
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

U.S. Patents USP 5977215, USP5652291 and USP 6001924 prepare polyurethane acrylic hybrid emulsion by copolymerization of polyurethane and acrylate monomer to increase the solid content of PUD, but reduce the wear resistance and cold resistance of polyurethane materials, and the process is complicated
In terms of increasing the solid content of PUD, the existing literature only stays on the change of raw materials and formulations. For example, Li Qing'an et al. mixed isophorone diisocyanate and hexamethylene diisocyanate with high dimethylol propionic acid content. Under the conditions, the polyester-type anionic water-based polyurethane with a solid content of more than 50% was successfully prepared; there are also methods such as changing the hydrophilic monomer to increase the solid content, but the increase in the curing amount of the emulsion is limited, and usually contains high hydrophilic group, which reduces the water resistance and resistance to other chemical media of the PUD film

Method used

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  • Preparation method of polyurethane aqueous dispersion and waterborne polyurethane paint containing polyurethane aqueous dispersion
  • Preparation method of polyurethane aqueous dispersion and waterborne polyurethane paint containing polyurethane aqueous dispersion
  • Preparation method of polyurethane aqueous dispersion and waterborne polyurethane paint containing polyurethane aqueous dispersion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) Preparation of polyurethane containing carboxylate

[0051] (a) Raw material composition

[0052] Polymer alcohol chain extender: 70g polyether polyol N220;

[0053] Multifunctional crosslinking agent: 1.0g hexamethylene diisocyanate trimer N3300;

[0054] Diisocyanate monomer: 35g isophorone diisocyanate;

[0055] Dimethylol alkyl carboxylic acid: 4.0 g dimethylol propionic acid;

[0056] Neutralizer: 4.0g triethylamine.

[0057] (b) process steps

[0058] In a reaction kettle equipped with a stirring blade, a thermometer and a condenser, add a polymer alcohol chain extender, a multifunctional crosslinking agent and a diisocyanate monomer, raise the temperature to 80°C, and keep it warm for 1.5 hours; add dimethylol alkane Carboxylic acid, reacted at 60°C until the NCO group content is 3%; use acetone to adjust the viscosity of the reactant to 300CPS, cool down to 45°C, add a neutralizing agent to neutralize, and obtain carboxylate-containing polyurethane.

...

Embodiment 2

[0091] (1) Preparation of polyurethane containing carboxylate

[0092] (a) Raw material composition

[0093] Polymer alcohol chain extender: 40g polycaprolactone diol; 20g polycarbonate diol;

[0094] Multifunctional crosslinking agent: 2.0g trimethylolpropane;

[0095] Diisocyanate monomer: 30g isophorone diisocyanate;

[0096] C2~C6 alkyl glycol: 2g 1,4-butanediol;

[0097] Dimethylolalkyl carboxylic acid: 5g dimethylolpropionic acid;

[0098] Neutralizer: 1.0g triethylamine; 3.0g ammonia water.

[0099] (b) process steps

[0100] In the reaction kettle equipped with stirring blade, thermometer and condenser, add polymer alcohol chain extender, multifunctional crosslinking agent and diisocyanate monomer, raise the temperature to 80°C, and keep it warm for 1.5 hours; add C2~C6 alkyl Dihydric alcohol, react at 70°C until the NCO group content is 13.5%, add dimethylol alkyl carboxylic acid, react at 60°C until the NCO group content is below 3%; adjust the viscosity of the...

Embodiment 3

[0128] (1) Preparation of polyurethane containing carboxylate

[0129] (a) Raw material composition

[0130] Polymer alcohol chain extender: 40g polyester diol T1136; 10g polycaprolactone diol;

[0131] Multifunctional crosslinking agent: 2.0g trimethylolpropane;

[0132] Diisocyanate monomer: 35g isophorone diisocyanate;

[0133] C2~C6 alkyl glycol: 6g 1,4-butanediol;

[0134] Dimethylolalkyl carboxylic acid: 7g dimethylolpropionic acid;

[0135] Neutralizer: 3g triethylamine, 4g N,N-dimethylethanolamine.

[0136] (b) process steps

[0137] In the reaction kettle equipped with stirring blade, thermometer and condenser, add polymer alcohol chain extender, multifunctional crosslinking agent and diisocyanate monomer, raise the temperature to 80°C, and keep it warm for 1.5 hours; add C2~C6 alkyl Dibasic alcohol, react to NCO group content at 70 ℃ and be 13.5%, add dimethylol alkyl carboxylic acid, react to NCO group content at 60 ℃ and be 2.1%; Regulate reactant viscosity w...

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Abstract

The invention relates to a preparation method of polyurethane aqueous dispersion, belonging to the field of the organic polymer compound. The method comprises the following steps: (1) mixing polyurethane with carboxylate and polyurethane without carboxylate in a weight ratio of 1:0.1-3, adding deionized water which is 1-10 times of polyurethane with carboxylate to emulsify; (2) adding amine chainextender which is 0.1-1w% of polyurethane with carboxylate to react and ensure that the content of NCO is less than 0.5%; (3) distilling to remove solvent, adjusting the pH value to 6-8 to obtain thepolyurethane aqueous dispersion, wherein the solid content of the polyurethane aqueous dispersion is 40-70% and the latex particle size is 60-500nm. The aqueous dispersion prepared by the method has high solid content; and by adopting the waterborne polyurethane paint prepared from the aqueous dispersion, the construction quality of the polyurethane aqueous dispersion can be increased, the construction cost can be reduced and the luster and decoration performance of the film can be increased.

Description

technical field [0001] The invention belongs to the field of organic macromolecular compounds, and relates to macromolecular compounds obtained from isocyanate or isothiocyanate, in particular to aqueous polyurethane dispersions. Background technique [0002] The urethane bond, urea bond, biuret and ester bond contained in the polyurethane structure endow the polyurethane coating film with excellent wear resistance, flexibility, low temperature resistance and chemical medium resistance, and can be widely used as a coating , inks, adhesives, elastomers and sealing materials. Water-based polyurethane coatings use water as the main dispersion medium. They are non-flammable, environmentally friendly, and easy to clean. They have been successfully used in leather finishing agents, fabric finishing agents, and shoe adhesives. With the continuous enhancement of people's awareness of environment and health, polyurethane water dispersion has been paid more and more attention. The e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/69C08G18/67C08G18/65C08G18/66C08G18/82C09D175/04C09D175/06C09D175/08C09D175/14C14C11/00C09J175/04C09J175/06C09J175/08C09J175/14C09D11/00C09D11/102
Inventor 瞿金清朱延安孔霞陈焕钦
Owner SOUTH CHINA UNIV OF TECH