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Preparation and properties of nano SiO2 modified cellulose acetate aqueous polymer emulsion for leather finishing

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Abstract

Poor water solubility of cellulose acetate is a key factor limiting its application in leather finishing field. Herein, a self-emulsifying aqueous emulsion was synthesized by using cellulose diacetate (CDA) as the substrate, dimethylolbutyric acid (DMBA) as the hydrophilic agent, and hexamethylene diisocyanate (HDI) as the bridging agent. Because the flexible carbon chain of HDI has the advantages of easy bending and deformation, the problem of large steric hindrance and low reactivity of -OH during water-based CDA can be solved by using the method of converting reactive functional groups and transferring reactive sites. At the same time, the flexible molecule 1,4-butanediol (BDO) and propylene glycol polyether (N210) are used as chain extenders to increase the molecular stretch and curl ability by adjusting the ratio of molecular soft and hard segments, and improve emulsion stability and coating flexibility. And through the reaction of -NH2 and -NCO on the surface of nano SiO2 modified by KH550, the nano SiO2 is evenly distributed in the CDA water-based polymer to improve the comprehensive performance of the emulsion coating. Thus the nano-SiO2 modified cellulose acetate water-based polymer emulsion (SiO2/WCDA) is obtained for leather finishing. The emulsion particles show an oil-in-water (O/W) core–shell structure, and the average particle size and dispersion coefficient (PDI) of the particles are 88.79 nm and 0.150, respectively. The surface of the coating film is compact, flat, and hydrophobic, with the contact angle is 104.3 °. In addition, the coating film has good adhesion, water resistance, heat resistance, yellowing resistance, chemical resistance, flexibility and mechanical properties.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (21878181), Youth Talent Support Program of Science and Technology Association of Shaanxi University (20200611), Natural Science Basic Research Project of Shaanxi Provincial Department of Science and Technology (2021JQ-826) and Scientific Research Program Project of Weinan Normal University (20RC+9).

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Authors and Affiliations

  1. College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi’an, 710021, China

    Jing Zhang, Yan Bao, Mingyuan Guo & Zhenghua Peng

  2. Xianyang Vocational and Technical College, Xianyang, 712000, China

    Jing Zhang

  3. College of Chemistry and Materials Science, Weinan Normal University, Wainan, 714099, China

    Mingyuan Guo

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  1. Jing Zhang
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  2. Yan Bao
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Correspondence to Jing Zhang, Yan Bao or Mingyuan Guo.

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Zhang, J., Bao, Y., Guo, M. et al. Preparation and properties of nano SiO2 modified cellulose acetate aqueous polymer emulsion for leather finishing. Cellulose 28, 7213–7225 (2021). https://doi.org/10.1007/s10570-021-03901-y

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