A method for preparing waterborne polyurethane dispersion

By introducing amino acid ring-opening epoxy resin on the aqueous polyurethane molecular chain, a molecular structure containing carboxyl groups and tertiary amines is formed, the stability and adhesion properties of the aqueous polyurethane are solved, high adhesion, heat resistance and hydrolysis resistance are achieved, and the viscosity of the emulsion is reduced.

CN115838462BActive Publication Date: 2025-04-01WANHUA CHEM GRP CO LTD
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Patent Information

Application Number
CN202111098569.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-09-18
Publication Date
2025-04-01
Estimated Expiration
2041-09-18

AI Technical Summary

Technical Problem

In the prior art, water-based polyurethanes have problems with stability and adhesive properties during storage and use, and their heat resistance and hydrolysis resistance are insufficient, making it difficult to meet the requirements of adhesives.

Method used

By introducing an amino acid ring-opening epoxy resin on the polyurethane molecular chain, a molecular structure containing carboxyl groups and tertiary amines is formed, adhesion and heat resistance to the substrate are improved, and emulsion viscosity is reduced through the tertiary amine salt formation.

Benefits of technology

The high adhesion, heat resistance and hydrolysis resistance of aqueous polyurethane are achieved, while reducing the viscosity of the emulsion and improving the overall performance of the product.

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Abstract

The invention relates to a method for preparing a waterborne polyurethane dispersion. The waterborne polyurethane dispersion is prepared using a product obtained by ring-opening an aliphatic monoepoxy resin with amino acids as a raw material. Compared with the prior art, the waterborne polyurethane dispersion of the invention contains both carboxyl groups and amino groups in its molecular chain, and belongs to an amphoteric resin. The presence of carboxyl groups increases the polarity of the resin, thereby increasing the adhesion of the resin to a substrate, improving heat resistance, and preventing the resin from debonding when heated. The introduction of tertiary amine groups can neutralize acidic substances in the system, thereby improving the hydrolysis resistance of polyester polyurethane and reducing the viscosity of the emulsion.
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