Preparation method of waterborne polyurethane, waterborne polyurethane and application

By introducing nitrogen-hydroxymethyl functional groups into the molecular chain of waterborne polyurethane, the mixing complexity and pot life limitations of waterborne polyurethane coatings are solved, enabling stable storage of single-component products and efficient crosslinking after film formation. This improves the water resistance and mechanical strength of the coating film and meets environmental protection requirements.

CN121378643APending Publication Date: 2026-01-23HEXINCHUANG (SICHUAN) NEW MATERIAL TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202511550920.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-10-28
Publication Date
2026-01-23

AI Technical Summary

Technical Problem

Existing waterborne polyurethane coatings require precise mixing before use and have a limited applicable period. They are prone to gel failure due to cross-linking reactions, affecting construction efficiency and performance stability. Furthermore, conventional structures are difficult to form an effective three-dimensional network structure, resulting in insufficient water resistance and mechanical strength of the coating film.

Method used

By introducing latent crosslinking functional groups, such as nitrogen-hydroxymethyl groups, into the molecular chain of waterborne polyurethane, a dense three-dimensional network structure is formed by utilizing these functional groups to carry out crosslinking reactions under heating conditions. A stepwise synthesis strategy is adopted to precisely control the reaction path, ensuring the stability of the single-component product during storage and the efficient execution of the crosslinking reaction after film formation.

Benefits of technology

It achieves a balance between ease of application and high performance in single-component waterborne polyurethane, improves the water resistance, abrasion resistance, and mechanical strength of the coating film, avoids the operational complexity and waste issues of two-component systems, and meets environmental protection requirements.

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Abstract

The invention discloses a preparation method of waterborne polyurethane, which belongs to the field of polyurethane and comprises the following steps: step 1, obtaining sodium isobutoxide; 2, methanol amine and sodium isobutoxide are subjected to a contact reaction, and a first reactant is obtained; step 3, subjecting bromoisobutane and the first reactant to a contact reaction so as to obtain a second reactant, and removing impurities so as to obtain isobutoxy etherified methanol amine; 4, polyester polyol, polyether polyol or a mixture of the polyester polyol and the polyether polyol react with isocyanate to generate a third reactant of which the chain end is an isocyanate group, and the third reactant and isobutoxy etherified methanol amine are mixed and react to obtain a polyurethane prepolymer; step 5, emulsifying the polyurethane prepolymer to obtain waterborne polyurethane; the invention also discloses the polyurethane and application thereof.
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