目的 提升纳米纤维素(CNF)改性效果，改善所制备的聚乳酸/纳米纤维素(PLA/CNF)涂布纸的透湿性能。 方法 采用AlCl3/ZnCl2溶液体系对CNF先溶解再进行Y-甲基丙烯酰氧基丙基三甲氧基硅烷(KH-570)改性得到溶解改性CNF(DMCNF)，与PLA在二氯甲烷溶液中共混得到PLA/DMCNF溶液，通过多功能涂布实验机对纸张进行涂布，制备PLA/DMCNF涂布纸，并对改性前后的CNF化学结构、晶体结构及涂布纸性能等进行测试。结果 从XRD和TEM图可知，溶解后CNF的晶型发生改变，纤维形貌遭到破坏，从XPS图中得到DMCNF表面的Si含量是MCNF的2.64倍，说明溶解对CNF的改性起到了明显促进作用。涂布后纸张的拉伸强度和拉伸应力都得到明显提高，在涂布量为10.20 g/m²时拉伸强度达到最高39.11 MPa，比原纸提高83.5%;在涂布量为14.85 g/m²时，涂布纸拉伸应变达到最高6.36%，水接触角为120.9°，水蒸气透过率为210.191 1 g/(m².d)。结论 AlCl3/ZnCl2溶解对CNF改性有明显的促进作用，PLA/DMCNF涂层改善了纸张的透湿性、疏水性和拉伸性能。

The work aims to enhance the modification effect of CNF and improve the moisture permeability of the prepared PLA/CNF coated paper. AlCl3/ZnCl2 solution system was used to dissolve CNF, and then Y-methacryloyloxypropyltrimethoxysilane (KH-570) modification was performed to obtain dissolution-modified CNF (DMCNF), which was co-mingled with PLA in methylene chloride to obtain the PLA/DMCNF solution. Next, the paper was coated by multifunctional coating experimental machine to obtain the PLA/DMCNF coated paper and the chemical structure and crystal structure of CNF as well as the properties of the coated paper before and after modification were tested. From the XRD and SEM diagrams, it was seen that the crystal shape of CNF was changed and the morphology of fibers was destroyed after dissolution, and the Si content on the surface of DMCNF was 2.64 times higher than that of MCNF as obtained from the XPS diagrams, which directly indicated that dissolution played an obvious role in promoting the modification of CNF. The tensile strength and tensile stress of the coated paper were significantly improved, in which the tensile strength reached a maximum of 39.11 MPa at a coating amount of 10.20 g/m2, which was 83.5% higher than that of the original paper. At a coating amount of 14.85 g/m2, the tensile strain of the coated paper reached a maximum of 6.36%, with a water contact angle of 120.9°, and a water vapor transmission rate of 210.191 1 g/(m2.24 h). Therefore, AlCl3/ZnCl2 dissolution has an obvious promotion effect on CNF modification, and the PLA/DMCNF coating improves the moisture permeability, hydrophobicity and tensile properties of the paper.