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