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Preparation and properties of waterborne polyurethane modified by stearyl acrylate for water repellents

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Abstract

Double bond end-capped waterborne polyurethane (DWPU) was synthesized from toluene diisocyanate, hydroxypropyl polysiloxane, trimethylolpropane, N-methyldiethanolamine, and hydroxyethyl acrylate. Then water repellents with long-chain hydrophobic alkyl structure were obtained by radical copolymerization of stearyl acrylate (SA) and DWPU. The waterproofing performance and other properties of the water repellents were studied for different SA contents. The results showed that, for the water repellent with SA content of 50 wt%, the water absorption of the film reduced to 4.29% while the water contact angle of fabric coated by the water repellent rose to 141.5°. In addition, the optimum SA content of the water repellent was 40%, achieving the highest score of 85 points in the waterproof performance evaluation.

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Authors and Affiliations

  1. School of Material Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China

    Lixia Sheng, Xuetong Zhang, Zhen Ge, Zhu Liang, Xiaoli Liu, Chunpeng Chai & Yunjun Luo

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  1. Lixia Sheng
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  2. Xuetong Zhang
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  3. Zhen Ge
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  4. Zhu Liang
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  5. Xiaoli Liu
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  6. Chunpeng Chai
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  7. Yunjun Luo
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Correspondence to Zhen Ge or Yunjun Luo.

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Sheng, L., Zhang, X., Ge, Z. et al. Preparation and properties of waterborne polyurethane modified by stearyl acrylate for water repellents. J Coat Technol Res 15, 1283–1292 (2018). https://doi.org/10.1007/s11998-018-0096-x

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