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A kind of aqueous polyurethane dispersion and its preparation method and application

A technology of water-based polyurethane and polyurethane prepolymer, which is applied in applications, household utensils, inks, etc., can solve the problems of increasing the hydrophilicity of polyurethane chains and insufficient water resistance of products, and achieve excellent mechanical properties and simple processes.

Active Publication Date: 2019-12-24
卢中敏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, increase the hydrophilicity of the polyurethane chain, and there is a problem of insufficient water resistance of the product

Method used

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  • A kind of aqueous polyurethane dispersion and its preparation method and application
  • A kind of aqueous polyurethane dispersion and its preparation method and application
  • A kind of aqueous polyurethane dispersion and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Add metered polypropylene glycol, dimethylol butyric acid, and polyethylene oxide-containing one-sided terminal diol (Ymer N120) to a three-necked flask equipped with a stirrer, a thermometer, and a nitrogen gas guide tube, and heat to 80 ℃, -0.1MPa vacuum to remove water for 2 hours, drop the temperature and add diisocyanate, react at 85 ℃ for 2 to 4 hours to obtain a polyurethane prepolymer. Cool to 50-60°C, add triethylamine, stir for 10 minutes, add a small amount of water to pre-emulsify, then add water dropwise to disperse, then add the chain extender ethylenediamine solution (15wt%) to the dispersion, and continue stirring for 1 hour, filtered to obtain an aqueous polyurethane dispersion. The addition amount of each substance in the above-mentioned method is shown in Table 1.

Embodiment 2-5

[0050] Using the method described in Example 1, the ratio of each raw material component was adjusted to prepare an aqueous polyurethane dispersion, and the performance of the product was tested. The raw material components and the ratio of each component and the test results are shown in Table 1.

[0051] Initial dryness test: the water-based polyurethane prepared in the embodiment is blended with the commercial water-based ink binder, and the mass ratio is 10 / 90. With reference to GBT 13217.5-2008 liquid ink initial dryness test method, the drying length of the commercial water-based ink binder is Comparing the standard, if the drying length of the blend is short, it is considered that the water-based polyurethane of the present invention can prolong the drying time of the water-based ink and has a moisturizing effect, and mark "○", otherwise it is "●".

[0052] Mechanical properties: the water-based polyurethane prepared in the embodiment is blended with the commercial water...

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Abstract

The invention discloses water-based polyurethane dispersion and a preparation method and application thereof. The water-based polyurethane dispersion is water-based dispersion of polyurethane (Y) which contains hydrophilic side chains, and polyurethane prepolymer (X) of the polyurethane (Y) which contains the hydrophilic side chains is obtained through a reaction of raw materials which comprise ahydroxyl-containing compound (A), an isocyanate group-containing compound (B), polyethoxyethyl single-side chain terminal-containing polyol (C) and carboxy-containing polyol. Through the water-based polyurethane dispersion, the drying speed of water-based ink can be regulated, and excellent mechanical properties of the water-based ink can be maintained; water resistance of a polyurethane (Y)-containing cured product of the water-based ink can be controlled by adjusting the content of the non-ionic hydrophilic side chains, so that requirements of printing operation of the water-based ink and water resistance of the final product are met; in addition, the preparation process of the water-based polyurethane dispersion is free of organic solvents, simple and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a water-based polyurethane dispersion and its preparation method and application. Background technique [0002] Water-based inks are widely used on textile substrates in the sporting goods industry, and their main components are binders and additives. Water-based polyurethane has many advantages such as wear resistance, good elasticity, and designable performance, and is a commonly used water-based ink binder. Water-based ink additives usually include thickeners, humectants or moisturizing components (such as slow drying agents, etc.), defoamers, etc. In order to meet the application requirements, the solid content of water-based polyurethane used as a binder is generally above 40%, but too high a solid content will cause the water-based ink to dry quickly, and problems such as screen blocking and unqualified printed products are prone to occur during print...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/72C08G18/66C08G18/48C08G18/34C08G18/32C08G18/12C09D11/03
CPCC08G18/12C08G18/348C08G18/4825C08G18/4833C08G18/6692C08G18/72C09D11/03C08G18/3228
Inventor 龚翠然罗震许莹郑杨清周照喜
Owner 卢中敏