A kind of extinction type waterborne polyurethane emulsion and preparation method thereof

A water-based polyurethane and water-based emulsion technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as difficulty in meeting low VOC emission standards, and achieve the effects of improving settlement, improving mechanical properties, and improving solvent resistance

Active Publication Date: 2018-11-27
优美特(北京)环境材料科技股份公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is still unavoidable to use a large amount of toxic additives and alcohol ether solvents in the system, which is difficult to meet the requirements of low VOC emission standards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0054] The preparation method of the A component comprises the following steps:

[0055] (1) reacting isocyanate, polyol, and hollow microspheres at 60-100°C for 2-4 hours;

[0056] (2) adding a chain extender, an initiator and a solvent, and reacting at 50-90°C for 3-5 hours to obtain a prepolymer;

[0057] (3) Cool down to 30-50°C, add salt-forming agent and solvent, and stir for 30 minutes to 1 hour;

[0058] (4) Lower the temperature by 10-30°C, add an appropriate amount of deionized water, and stir at high speed to disperse for 30-60 minutes.

[0059] (5) adding an amine chain extender to further extend the chain to obtain component A;

[0060] The delustering water-based polyurethane emulsion is mainly prepared from A component and B component;

[0061] The preparation method of the B component comprises the following steps:

[0062] (1) react isocyanate and polyol at 60-100°C for 2-4 hours;

[0063] (2) adding a chain extender, an initiator and a solvent, and react...

Embodiment 1

[0068] A kind of preparation method of matting type aqueous polyurethane emulsion, comprises the steps:

[0069] (1) 20g molecular weight is 1000 polyethylene terephthalate polyols and 10g isophorone diisocyanate, 1g silicon dioxide hollow microspheres (particle diameter 1000nm, wall thickness 100nm) add in the there-necked flask, React at 90°C for 3 hours;

[0070] (2) Add 1.5g of dimethylolpropionic acid, 0.8g of trimethylolpropane, 4g of N,N-dimethylacetamide and a small amount of dibutyltin dilaurate into the reaction system, and react at 90°C for 4 hours;

[0071] (3) Cool down to 50°C, add 1g of triethylamine and 4g of acetone solution for neutralization, and react for 1 hour;

[0072] (4) Cool down to below 30°C, add 60g of water for emulsification for 30 minutes;

[0073] (5) Add 0.7 g of ethylenediamine aqueous solution to carry out chain extension again for 1 hour, filter and discharge, and obtain water-based polyurethane emulsion component A.

[0074] (6) Prepare...

Embodiment 2

[0077] A kind of preparation method of matting type aqueous polyurethane emulsion, comprises the steps:

[0078] (1) Add 15g of polytetrahydrofuran ether polyol with a molecular weight of 1500, 12g of diphenylmethane diisocyanate, and 4g of silica hollow microspheres (particle diameter 1500nm, wall thickness 80nm) into a three-necked flask, and react at 80°C for 4 hours ;

[0079] (2) Add 2.0g of dimethylolbutyric acid, 0.5g of trimethylolpropane, 4g of N,N-dimethylacetamide and a small amount of dibutyltin dilaurate into the reaction system, and react at 80°C for 4 hours;

[0080] (3) Cool down to 50°C, add 1.2g triethylamine and 4g acetone solution for neutralization, and react for 1 hour;

[0081] (4) Cool down to below 30°C, add 55g of water for emulsification for 30 minutes;

[0082] (5) Add 0.8 g of ethylenediamine aqueous solution to carry out chain extension again for 1 hour, filter and discharge, and obtain water-based polyurethane emulsion component A.

[0083] (6...

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Abstract

The invention provides extinction type aqueous polyurethane emulsion and a preparation method of the extinction type aqueous polyurethane emulsion. A polyurethane chain section is cladded on a hollow microsphere through a chemical bond by utilizing the large-grain-diameter hollow microsphere with an active functional group, so that a large-size latex particle is formed. The hollow microsphere has small density and has a hollow structure, so that the sedimentation problem of large-size polyurethane colloidal particles can be improved. Meanwhile, in a process of drying and forming a film, the particles can be gathered on the surface of the film to form certain roughness, so that the extinction aim is reached. The extinction degree can be regulated and controlled through adjusting the hollow structure and the grain size of the hollow microsphere, and aqueous polyurethane extinction emulsion, which meets different extinction requirements and is stable, can be prepared. According to the extinction type aqueous polyurethane emulsion provided by the invention, the extinction degree is adjustable; the solid content, the water resistance, the heat resistance and the mechanical properties are improved, and the extinction type aqueous polyurethane emulsion can be used as an extinction coating of leather, wood lacquer and the like.

Description

technical field [0001] The invention relates to the technical field of water-based functional polymer emulsions, in particular to a matting water-based polyurethane emulsion and a preparation method thereof. Background technique [0002] With the enactment and implementation of environmental protection laws in various countries, water-based coatings are gradually replacing solvent-based coatings due to their non-combustibility, non-toxicity or low toxicity, little harm to the environment, and the advantages of saving energy and resources. important direction. Water-based polyurethane coatings are gradually becoming the focus of water-based coatings because they can introduce various functional groups into the polyurethane chain for cross-linking and composite modification through molecular design. [0003] Water-based polyurethane can be divided into high-gloss, flat-gloss, matte, etc. according to the glossiness after film formation. It is generally considered that the gl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/06C09D175/08C09D7/62C08G18/32C08G18/42C08G18/44C08G18/48C08G18/66C08G18/75
CPCC08G18/3203C08G18/4213C08G18/44C08G18/4854C08G18/6644C08G18/6677C08G18/755C09D7/62C09D7/65C09D175/06C09D175/08
Inventor 张建森罗楠张冬海
Owner 优美特(北京)环境材料科技股份公司
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