Research progress of preservative coating of natural polymer materials Qingyan Pan, Chuang Zhou, Ziming Yang, Zuyu He, Chao Wang, Hui Gu, Yunhui Qu and Puwang Li E3S Web Conf., 213 (2020) 02041 Published online: 01 December 2020 DOI: 10.1051/e3sconf/202021302041