China Plastics ›› 2024, Vol. 38 ›› Issue (4): 19-25.DOI: 10.19491/j.issn.1001-9278.2024.04.004

• Materials and Properties • Previous Articles     Next Articles

Study on preparation of poly(lactic acid)⁃based waterborne polyurethane and its application in synthetic leathers

SHEN Dantong1, XUE Yuting1, LI Rongjie2, XU Fang1(), WENG Yunxuan1()   

  1. 1.College of Light Industry Science and Engineering, Beijing Technology and Business University, Beijing 100048 China
    2.Anhui Fengyuan Biotechnology Co, Ltd, Bengbu 233700, China
  • Received:2023-09-05 Online:2024-04-26 Published:2024-04-22

Abstract:

Poly(lactic acid) (PLA)⁃based waterborne polyurethane (WPU) was synthesized using PLA⁃OH and hexamethylene diisocyanate as raw materials with different contents of 2,2⁃dimethylolbutyric acid (DMBA) as a hydrophilic chain extender. Then, the PLA⁃WPU adhesive film and ultrafine fiber synthetic leathers were prepared. The particle size of the PLA⁃WPU lotion decreased with an increase in the DMBA content, and however, its solid content increased. The resultant PLA⁃WPU superfine fiber synthetic leather also obtained an increase in the tensile strength and maximum load but a decrease in the water contact angle. The solid content of the PLA⁃WPU lotion containing 5.5 wt% DMBA reached 35.4 %, and its particle size was 196.37 nm. In this case, the tensile strength of PLA⁃WPU superfine fiber synthetic leather was 29.9 MPa, which was as about 1.7 times as that of the superfine fiber substrate. In addition, the water contact angle of the PLA⁃WPU superfine fiber synthetic leather decreased to 73 ° when the DMBA content increased to 5.5 %.

Key words: waterborne polyurethane, poly(lactic acid diol), hydrophilic chain extender, microfiber synthetic leather

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