Quick-drying waterborne polyurethane resin as well as preparation method and application thereof

By constructing a double crosslinking network using self-made polyester polyol and polyether polyol, and compounding with isocyanate, the problems of fast drying and water resistance of existing waterborne polyurethane resins have been solved, achieving a balance between fast drying and high water resistance under conditions without a drying agent, making it suitable for automotive coatings.

CN122277855APending Publication Date: 2026-06-26KEKONG ENVIRONMENTAL PROTECTION MATERIALS (SHAOGUAN) CO LTD
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Patent Information

Application Number
CN202610556983.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-24
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing fast-drying waterborne polyurethane resins have excessive amounts of hydrophilic monomers, poor water resistance, and rely on drying agents and film-forming aids to achieve fast drying. They also have a narrow application window, high operational requirements, complex processes, and high costs.

Method used

The soft segment, which combines rigidity and flexibility, is constructed by using self-made polyester polyol and polyether polyol. A double cross-linking network is formed by the internal branching points of trimethylolpropane and self-made polyester polyol. The isocyanate compound balances hardness and pot life. The neutralizing agent converts the hydrophilic monomer into ammonium carboxylate. The high R value design achieves a balance between fast drying and high water resistance without the addition of external drying agents.

Benefits of technology

It achieves a balance between fast drying and high water resistance without the addition of external driers and amine chain extension, meeting the requirements of wet-on-wet processes. The process is simple, low-cost, and suitable for automotive coatings.

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Abstract

The invention discloses quick-drying waterborne polyurethane resin as well as a preparation method and application thereof, and the quick-drying waterborne polyurethane resin is prepared from the following components in parts by weight: 30 to 40 parts of self-made polyester polyol, 30 to 50 parts of polyether polyol, 2 to 5 parts of chain extender, 1 to 3 parts of hydrophilic monomer, 1 to 3 parts of trimethylolpropane, 40 to 60 parts of isocyanate, 1.1 to 1.5 parts of neutralizer and 50 to 80 parts of solvent. According to the quick-drying type waterborne polyurethane resin, a soft segment with hardness and softness is constructed through self-made branched polyester and polyether, self-emulsification is achieved and the water resistance is guaranteed through low hydrophilic monomer consumption, a dual cross-linked network is formed through built-in branched points of trimethylolpropane and self-made polyester polyol, and the hardness and the working life are both considered through compounding of isocyanate; the high R value design enables residual NCO to naturally generate urea bonds during emulsification to compensate emulsification difficulty brought by low hydrophilicity, finally unification of quick drying and high water resistance is achieved under the conditions of no additional drier and no amine post-chain extension, and the quick-drying high-water-resistance polyurethane emulsion has the advantages of quick drying, high water resistance, excellent mechanical properties, simple process, low cost and good industrial popularization value.
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