Waterproof waterborne polyurethane coating agent and preparation method thereof

By introducing long-chain alkyl groups into polyurethane and optimizing the combination of isocyanate and polyol, the waterproof performance and dispersion performance of polyurethane in humid environments are solved, and better waterproof effect and stability are achieved.

CN119192976APending Publication Date: 2024-12-27QINGYUAN MELESI ENVIRONMENTAL PROTECTION NEW MATERIALS CO LTD
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Patent Information

Application Number
CN202411467084.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-10-21
Publication Date
2024-12-27

AI Technical Summary

Technical Problem

The performance and life of existing waterproof water-based polyurethane coating agents in humid environments are adversely affected, and it is difficult to maintain dispersed properties in water while maintaining good waterproofing capabilities.

Method used

By introducing long-chain alkyl groups in the prepolymerization process of isocyanate and polyol, the hydrophobicity of polyurethane is improved, thereby improving its waterproofing properties, and optimizing the dispersion properties of polyurethane through specific combinations of isocyanate and polyols.

Benefits of technology

It effectively improves the waterproofing performance of polyurethane and its dispersion performance in water, avoids the problem of insufficient waterproofing ability caused by excessive hydrophilicity, and maintains the stability and dispersion of polyurethane.

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Abstract

The invention belongs to the technical field of surface treatment agent production, and discloses a waterproof waterborne polyurethane coating agent which comprises the following components in parts by mass: 40-60 parts of polyester polyol, 15-30 parts of isocyanate, 2-5 parts of dihydric alcohol, 1-5 parts of 2, 2-dimethylolpropionic acid and 50-90 parts of a solvent, the number of carbon atoms of long-chain alkyl in the long-chain isocyanate is not less than 12, the long-chain alkyl is introduced to a molecular chain of polyurethane through the isocyanate containing the long-chain alkyl in the prepolymerization process of the isocyanate and the polyol, so that the hydrophobicity of the polyurethane is improved to a certain extent, and the waterproof performance of the polyurethane is further improved; the invention further discloses a preparation method of the waterproof waterborne polyurethane coating agent.
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Citation Information

Patent Citations

  • Water dispersion polyurethane resin composition and accessory decorations using the same

    KR101053206B1