High-solid-content water-based polyether type polyurethane resin and preparation method thereof

Abstract

The invention provides a high-solid-content water-based polyether polyurethane resin, which consists of the following raw materials in parts by weight: 100-150 parts of polyol, 20-40 parts of polyisocyanate, 4-8 parts of the first chain extender, and 3-5 parts of dichain extender, 3-6 parts of triethylamine, 0.05-0.1 part of organic bismuth catalyst, and 120-140 parts of water. Weigh the polyol and polyisocyanate by parts, and react at 85-95°C for 2-3h; then add the first chain extender, acetone, and react at 75-85°C for 1-3h; then add organic bismuth catalyst, React at 65-75°C for 2-3 hours, cool down to 35-45°C, add triethylamine and stir, add water and continue stirring, then add the second chain extender, and then react the reactant at 30-60°C After 2-3 hours, the acetone is removed in vacuum to obtain the high-solid-content water-based polyether polyurethane resin. The solid content of the polyurethane resin of the invention can reach more than 60%, and has excellent elasticity, excellent moisture and heat resistance, high peeling strength and excellent water resistance, and is especially suitable for textile coating.

Description

technical field [0001] The invention relates to the field of high molecular polymers, in particular to a high-solid-content water-based polyether polyurethane resin and a preparation method thereof. Background technique [0002] Water-based polyurethane resin uses water as the dispersion medium and adopts the method of self-emulsification or adding an emulsifier. However, the solid content of domestic water-based polyether polyurethane is generally below 50%, resulting in high post-processing baking costs and drying of thick coating films. Difficult and poor resistance to heat and humidity. However, conventional polyester waterborne polyurethane has the problem of poor hydrolysis resistance. Therefore, there is an urgent need for a water-based polyether polyurethane resin with a high solid content in the polymer field. Contents of the invention [0003] The purpose of the present invention is to overcome the defects of the prior art and provide a high-solid-content water...

AI Technical Summary

Problems solved by technology

[0002] Water-based polyurethane resin uses water as the dispersion medium and adopts the method of self-emulsification or adding an emulsifier. However, the solid content of domestic water-based polyether polyurethane is generally below 50%, resulting in high post-processing baking costs and drying of thick coating films. Difficult and poor resistance to heat and humidity

However, the conventional polyester water-based polyurethane has the problem of poor hydrolysis resistance.

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