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Synthesis and properties of castor oil–based cationic waterborne polyurethane modified by epoxy resin

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Abstract

Waterborne polyurethane (WPU) has gained widespread attention. However, conventional linear WPU emulsions have lower mechanical properties, poor water resistance, and other disadvantages. In this study, polyurethane prepolymers containing branched chains were successfully synthesized by using diphenylmethane diisocyanate (MDI), polytetramethylene ether glycol (PTMG) and castor oil (CO) as the main raw materials. On this basis, epoxy resin was used to further modify the obtained polyurethane prepolymers, which results in an increase in mechanical properties, water resistance, and heat resistance due to the formation of a network cross-linked structure during the film formation. The type and addition amount of epoxy resin were determined by centrifugal stability and particle size of WPU emulsions, water absorption, and mechanical properties of WPU films. The results showed that the prepared epoxy resin–modified WPU (EWPU) emulsions have excellent centrifugal stability. If 7% epoxy resin was added after the polyurethane chain expansion, the corresponding EWPU films have good mechanical properties (the tensile strength of 28.7 MPa and the elongation at break of 379%), water resistance (water absorption of 4.21%), and the thermal stability due to the cross-linked structure in EWPU. This kind of EWPU emulsions may have promising applications in coating material, adhesives, and the textile industry.

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Funding

This work was funded by List of Key Science and Technology Projects in Transportation Industry in 2021, China (project no. 2021-MS1-010), and the Project of Shandong Hi-Speed Group Innovation Research Institute (project no. (2022)SDHSIRI-CL-002).

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Authors and Affiliations

  1. Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials, School of Chemistry and Chemical Engineering, University of **an, 336 West Road of Nan **nzhuang, **an, 250022, People’s Republic of China

    **ufen Liu, Fengyuan Sun, Yifan Liu, Baojian Yao, Haishan Liang & Xue Li

  2. Shandong Hi-Speed Group Innovation Research Institute, **an, 250100, China

    Minghao Mu, **nqiang Liu, Haisong Bi, Zheng Wang & Chengduo Qian

Authors
  1. **ufen Liu
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  2. Fengyuan Sun
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  3. Yifan Liu
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  4. Baojian Yao
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  5. Haishan Liang
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  6. Minghao Mu
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  7. **nqiang Liu
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  8. Haisong Bi
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  9. Zheng Wang
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  10. Chengduo Qian
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  11. Xue Li
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Contributions

**ufen Liu: Methodology, Data curation, Writing-Original draft preparation. Fengyuan Sun: Visualization, Investigation. Yifan Liu: Visualization, Investigation. Baojian Yao: Methodology, Formal analysis. Haishan Liang: Formal analysis, Investigation. Minghao Mu: Formal analysis, Investigation, Funding acquisition, Project administration. **nqiang Liu: Formal analysis, Investigation, Project administration. Haisong Bi: Methodology, Editing. Zheng Wang: Methodology, Formal analysis. Chengduo Qian: Formal analysis, Investigation. Xue Li: Conceptualization, Methodology, Funding acquisition, Project administration, Writing-Reviewing and Editing.

Corresponding author

Correspondence to Xue Li.

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We declare that we have no financial and personal relationships with other people or organizations that can inappropriately influence our work; there is no professional or other personal interest of any nature or kind in any product, service and/or company that could be construed as influencing the position presented in, or the review of, the manuscript entitled.

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Liu, X., Sun, F., Liu, Y. et al. Synthesis and properties of castor oil–based cationic waterborne polyurethane modified by epoxy resin. Colloid Polym Sci 302, 13–22 (2024). https://doi.org/10.1007/s00396-023-05174-2

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  • DOI: https://doi.org/10.1007/s00396-023-05174-2

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