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Waterborne polyurethane dispersion and application thereof

A water-based polyurethane and dispersion technology, applied in the field of coatings, can solve the problems of toxicity, high price, restrictions, etc., and achieve the effect of improving weather resistance and great promotion value

Inactive Publication Date: 2016-12-21
肇庆浩城树脂科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its high cost and toxicity limit its application.

Method used

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  • Waterborne polyurethane dispersion and application thereof
  • Waterborne polyurethane dispersion and application thereof
  • Waterborne polyurethane dispersion and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0064] In the preparation of the prepolymer, the isocyanate index is 1.0-4.0, preferably 1.1-3.5, more preferably 1.2-3.0. During the preparation, the monomers can be completely reacted or partially reacted, preferably completely reacted. In this way, polyurethane prepolymers containing free isocyanate groups are obtained in bulk or in solution.

[0065] The aqueous polyurethane dispersion is prepared by adding water to the prepolymer or adding the prepolymer to water, preferably adding water to the prepolymer. If the prepared prepolymer is difficult to disperse, use aliphatic ketones such as acetone or methyl ethyl ketone for viscosity reduction.

[0066] Subsequently, the -NH-containing 2 The functional or -NH functional component reacts with the remaining isocyanate groups. This step can be performed in a solvent or in water before, during and after dispersion. Use conforming to the definition of component C), containing -NH 2 It is preferable to carry out the chain ex...

Embodiment 1

[0082] Example 1 A kind of aqueous polyurethane dispersion

[0083] B) component 236g polytetrahydrofuran polyol (Mn=1000), D) component 17.6g dimethylol butyric acid, C) component 5.3g 1,3-butanediol, C) component 3.8g neopentyl Add diol and 150g of acetone into the reactor, heat to 60°C, and stir. Then A) component 74.5 g of hexamethylene diisocyanate (HDI) and F) component 1.4 g of dibutyltin dilaurate were added and the mixture was heated to 70°C. Stirring was carried out at this temperature until the NCO content reached 8.1%. Then, the mixture was cooled to 50° C., and then 9.2 g of triethylamine, component E), was added and stirred for 30 min. The prepolymer was dispersed in 750 g of water, and the water was added at 0°C. After dispersion, stir for another 10 min. An aqueous solution (60 g) of C) component 1.2 g of hydrazine hydrate and C) component of 1.6 g of ethylenediamine was then added within 10 min. After complete addition of the aqueous solution, the mixtur...

Embodiment 2

[0084] Example 2 A kind of aqueous polyurethane dispersion

[0085] B) component 245g polytetrahydrofuran polyol (Mn=1000), B) component 100g polycarbonate polyol (Mn=2000), D) component 16.7g dimethylol propionic acid, C) component 5.2 g1,3-butanediol, C) component 3.6g neopentyl glycol and 150g acetone were added into the reactor, heated to 60°C and stirred. Then add A) component 34.1 g hexamethylene diisocyanate (HDI), A) component 40.4 g isophorone diisocyanate and F) component 1.3 g dibutyltin dilaurate, and heat the mixture to 70°C . Stirring was carried out at this temperature until the NCO content reached 7.4%. Then, the mixture was cooled to 50° C., and then 8.9 g of triethylamine, component E), was added and stirred for 30 min. The prepolymer was dispersed in 750 g of water, and the water was added at 0°C. After dispersion, stir for another 10 min. Then an aqueous solution (60 g) of C) component 1.2 g of hydrazine hydrate C) component and 1.8 g of ethylenediam...

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Abstract

The invention discloses a waterborne polyurethane dispersion and application thereof. The waterborne polyurethane dispersion is prepared from the following components through reacting: (A) one or more types of polyisocyanate; (B) one or more types of polymeric glycols; (C) one or more types of compounds containing one or more hydroxyl groups or amino groups; (D) one or more ionic, potential-ionic or non-ionic hydrophilic compounds with isocyanate activity; (E) one or more types of salt forming reagents; (F) one or more types of catalysts; the use ratios of the components are as follows: 10 weight percent to 35 weight percent of the component (A), 50 weight percent to 90 weight percent of the component (B), 0.5 weight percent to 12 weight percent of the component (C), 1.5 weight percent to 15 weight percent of the component (D), 1.5 weight percent to 8.5 weight percent of the component (E), 0.001 weight percent to 0.5 weight percent of the component (F); the total sum of all the components is equal to 100 weight percent. The waterborne polyurethane dispersion provided by the invention contains a proper amount of polar groups and has an extremely excellent attaching force on an aluminum material; the attaching force reaches grade 0.

Description

technical field [0001] The invention relates to the field of coatings, more specifically, to a water-based polyurethane dispersion with good weather resistance, the preparation of the dispersion and its application on aluminum profiles. Background technique [0002] With the increasingly wide application of aluminum profiles in various industries, the coating of aluminum profiles has also achieved long-term development. At present, the coating of aluminum profiles includes anodic oxidation film, electrophoretic coating, powder coating, fluorocarbon coating and organic polymer coating. [0003] (1) The anodized film has relatively good corrosion resistance, wear resistance and high hardness. For example, CN 1920111B provides a composite coloring method of anodic oxidation film, which makes the color of the film layer richer. However, the process requires huge energy consumption and brings serious pollution of water and air. Therefore, it is usually used as a pretreatment f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/73C08G18/66C08G18/34C08G18/32C08G18/42C08G18/44C08G18/48C08G18/75C09D175/06C09D175/08
CPCC08G18/73C08G18/348C08G18/3855C08G18/4018C08G18/4277C08G18/44C08G18/4854C08G18/6618C08G18/6625C08G18/6692C08G18/722C08G18/755C08G18/758C09D175/06C09D175/08
Inventor 郑伟沈东东王成梁瑞芬
Owner 肇庆浩城树脂科技有限公司
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