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Waterborne polyurethane dispersion and its preparation method and application, waterborne coating

A technology of water-based polyurethane and water-based coatings, applied in the direction of polyester coatings, coatings, etc., can solve the problems of slow coating film formation speed, potential safety hazards of coatings, flammability and explosion, etc., to improve the thixotropic index and improve the alignment The effect of good ability and flatness

Active Publication Date: 2022-03-29
湖南湘江关西涂料(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional coating technology, the organic solvent-based coating is mainly through the rapid volatilization of the organic solvent, so that the coating film shrinks rapidly to achieve the excellent arrangement of the aluminum powder, but the organic solvent is more or less toxic to the human body, and most Organic solvents are flammable and explosive, and there are great safety hazards in the production and use of coatings
With the increasing improvement of environmental legislation and regulations, organic solvent-based coatings do not meet the requirements of modern society and have been gradually eliminated. Environmentally-friendly water-based coatings using water as a solvent have increasingly become the focus of attention. However, when using water-based coatings, solvent water The volatilization of aluminum powder is greatly affected by the temperature and humidity of the environment. Under normal temperature construction conditions, the film forming speed of the coating film is slow. Therefore, it is difficult to achieve the directional arrangement of the aluminum powder through the shrinkage of the coating film of the water-based coating.

Method used

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  • Waterborne polyurethane dispersion and its preparation method and application, waterborne coating
  • Waterborne polyurethane dispersion and its preparation method and application, waterborne coating
  • Waterborne polyurethane dispersion and its preparation method and application, waterborne coating

Examples

Experimental program
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Effect test

preparation example Construction

[0062] The raw materials for the preparation of the polyurethane resin include a polyurethane prepolymer, a polyol end-capping agent, the first catalyst and a neutralizing agent, and the raw materials for the polyurethane prepolymer include polyisocyanate compounds, macromolecular diol compounds, Small molecule glycol compound, chain extender and second catalyst; the raw materials for the preparation of the above water and the above polyurethane resin are as follows in parts by mass:

[0063]

[0064] In the above-mentioned water-based polyurethane dispersion, firstly, under the action of the second catalyst, the isocyanate compound, the macromolecular diol compound, the small molecule diol compound containing acidic groups and the chain extender of a specific mass fraction generate high molecular weight Polyurethane prepolymer; then the polyurethane prepolymer and the end-blocking agent are reacted under the action of the first catalyst and then neutralized by a neutralizin...

specific Embodiment

[0098] Here, according to the water-based polyurethane dispersion of the present invention, its preparation method and application, and water-based coatings, the present invention is not limited to the following examples.

[0099] Embodiment 1-5 According to the preparation method of the water-based polyurethane dispersion of the present invention, the water-based polyurethane dispersion is prepared, and the specific steps are as follows.

[0100] 1) Put the macromolecular diol compound and the diol compound containing acidic groups into the reaction kettle, and remove water under the condition of -0.09MPa negative pressure and 100°C until the water content is lower than 0.05%.

[0101] 2) Mix the polyisocyanate compound with the macromolecular diol compound after water removal and the diol compound containing acidic groups, pre-react for 30 minutes at 70-83°C, then add dibutyltin dilaurate, and then react for 1- After 2 hours, the reactant was obtained.

[0102] 3) Add the s...

Embodiment 6

[0112] Prepare the water-based paint, the specific steps are as follows.

[0113] 1) Under the stirring condition with a linear speed of 3m / s, put the weighed ethylene glycol butyl ether into the batching tank, add AL WM-6360 aluminum powder and AL 99-0779 aluminum powder while stirring, and stir for 0.5h to obtain aluminum Powder dispersion paste a.

[0114] 2) Under the condition of stirring with a linear speed of 5m / s, add the weighed CYMEL325 high imino amino resin, dipropylene glycol dimethyl ether and pH regulator (dimethylethanolamine) into the blending kettle in sequence, stir for 0.5h and mix well ; Then add the aluminum powder dispersion slurry a prepared in step 1) to the blending kettle while stirring to obtain component b.

[0115] 3) under the stirring condition that line speed is 3m / s, the aqueous polyurethane dispersion that Setaqua 6802 acrylic acid emulsion, Desmophen 1652 water-based polyester resin, Cy370 partly methylated amino resin, embodiment 1 make, n...

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Abstract

The invention provides a water-based polyurethane dispersion and its preparation method and application, and water-based paint. The raw materials for the preparation of the water-based polyurethane dispersion include: 13-19 parts of polyisocyanate compounds, 14-22 parts of macromolecular diol compounds, 3.5- 5.3 parts of small molecule glycol compounds containing acidic groups, 1 to 2 parts of chain extenders, 0.5 to 2 parts of polyol end-capping agents, 0.02 to 0.05 parts of catalysts, 1.5 to 3.4 parts of neutralizers and 54 to 6 parts of water . When the water-based polyurethane dispersion is applied to the preparation of water-based coatings, it can improve the thixotropic index of the water-based coatings during room temperature flash-drying or low-temperature heating flash-drying stages, and the viscosity of the water-based coatings after spraying will increase rapidly, thereby improving the aluminum powder in water-based coatings. The directional alignment ability in the middle, and the smoothness of the coating is good.

Description

technical field [0001] The invention relates to the technical field of water-based coatings, in particular to a water-based polyurethane dispersion, a preparation method and application thereof, and a water-based coating. Background technique [0002] The paint with aluminum powder has the characteristic of different colors according to the angle. With the change of the viewing angle or changing the irradiation angle of the light source, the color and luster of the paint will change accordingly, and it has a good flash effect. In recent years, a large number of paints with aluminum powder have been used in the preparation process of automobiles, mobile phones, digital cameras, notebooks, electronic wearable devices, etc., so as to highlight the appearance design of the items and leave a deeper impression on consumers . Among them, the microstructure of the aluminum powder used as a pigment is a lamellar structure. The better the alignment of the aluminum powder in the coati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/12C08G18/66C08G18/44C08G18/42C08G18/34C08G18/32C09D133/00C09D167/00C09D161/32C09D7/61C09D7/65
CPCC08G18/12C08G18/6659C08G18/6644C08G18/664C08G18/44C08G18/4277C08G18/348C08G18/3206C09D133/00C09D7/61C09D7/65C08K2003/0812C08L2205/035C08L67/00C08L61/32C08L75/06C08K3/08
Inventor 胡启明杨鹏飞张杰黄鹂董军胜
Owner 湖南湘江关西涂料(长沙)有限公司
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