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Study on Modified Lignin Used for Paper Strengthening
Received:April 18, 2025  Revised:May 06, 2025
DOI:10.11981/j.issn.1000-6842.2025.02.10
Key Words:lignin/Cu ion nanoparticles;modified lignin;paper strength
Fund Project:国家自然科学基金青年项目(22408392);江苏省自然科学基金青年项目(BK20240293,BK20230127);中国博士后科学基金面上项目(2024M753540);中国博士后科学基金特别资助项目(2023TQ0374)。
Author NameAffiliationPostcode
LYU Yan* Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing, Jiangsu Province, 210042 210042
HAN Shanming Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing, Jiangsu Province, 210042 210042
LI Jiongjiong College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, Jiangsu Province, 210037 210037
LIANG Fangmin* Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing, Jiangsu Province, 210042
Shandong Huatai Paper Co., Ltd., & Shandong Yellow Triangle Biotechnology Industry Research Institute Co., Ltd., Dongying, Shandong Province, 257335
School of Light Industry and Food Engineering, Guangxi Key Lab of Clean Pulp & Papermaking and Pollution Control, Guangxi University, Nanning, Guangxi Zhuang Autonomous Region, 530004 
530004
FANG Guigan* Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing, Jiangsu Province, 210042 210042
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Abstract:
      Using alkali lignin as raw material, lignin/copper ion nanoparticles (LNP/Cu) containing rich amounts of ortho-quinone and ortho-phenol were prepared using a self-assembly catalytic oxidation-reduction method. The alkali lignin and LNP/Cu were taken as paper reinforcement, via hot-press drying methods instead of room-temperature drying method to prepare reinforced paper. The effects of the additive and drying methods on paper strength properties were investigated. The results showed that the LNP/Cu prepared in this study exhibited a spherical shape with a diameter of approximately 300 nm and could be uniformly distributed in the paper, demonstrating superior reinforcement effects compared to alkali lignin. The hot-press drying method enhanced the interaction between lignin and fibers. Compared to paper produced without additives and using room-temperature drying, the tensile index, bursting index, and tearing index of the reinforced paper produced with LNP/Cu as an additive combined with the hot-press drying method (120 ℃, 0.14 MPa, 10 min) increased by 27.5%, 51.0%, and 9.6%, respectively, while the air permeability decreased by 38.8%.
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