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Water-based polyurethane resin polyurethane dispersion preparation method.

Preparation methods for water-based polyurethan dispersion mainly include:

1. Solvent method: first mix polyurethan and solvents, and then stir to obtain a homogeneous dispersion. Finally, by evaporating the solvent, a water-based polyamide resin dispersion is formed.

2. Emulsion method: first mix water-based polyol and emulsifier, and then stir and disperse uniformly. Finally, by heating, cooling, and vacuum dehydration, a stable emulsion is formed.

3. Preparation method of direct dispersion: first mix prepolymer and water, and then heat to disperse uniformly through high-speed stirring. Finally, by freezing drying, a water-soluble polyurethane dispersion with fine particles is formed.

4. Microcapsule method: first wrap the reaction-generated polymer in a microcapsule wall, and then dry and grind it into a microparticle form of water-solubilized polyurethane dispersions.

5 Self-emulsion method: introduce hydrophilic groups into the polyurethane to self-emulsify in water, forming water-solubile polyurethane powders.

The above various methods can be selected and optimized according to practical needs to obtain excellent performance water-based polyether dispersions.