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| Study on Synergistic Mechanism of Structure and Properties of Cationized Pulp Regulated by Lignin Content and Strengthening of Its Antibacterial Function |
| Received:March 17, 2025 Revised:April 07, 2025 |
| DOI：10.11980/j.issn.0254-508X.2025.08.008 |
| Key Words:lignin cationized EPTAC antibacterial performance |
| Fund Project:国家重点研发项目“生物造纸技术及产业示范”（2022YFC2105503）。 |
| Author Name | Affiliation | Postcode | | WANG Weizhuang* | State Key Lab of Bio-based Fiber Materials, Tianjin Key Lab of Pulp and Paper, Tianjin University of Science and Technology, Tianjin, 300457 | 300457 | | LI Zhiqiang* | State Key Lab of Bio-based Fiber Materials, Tianjin Key Lab of Pulp and Paper, Tianjin University of Science and Technology, Tianjin, 300457 | 300457 | | YAN Chenyang | State Key Lab of Bio-based Fiber Materials, Tianjin Key Lab of Pulp and Paper, Tianjin University of Science and Technology, Tianjin, 300457 | 300457 | | WU Hao | State Key Lab of Bio-based Fiber Materials, Tianjin Key Lab of Pulp and Paper, Tianjin University of Science and Technology, Tianjin, 300457 | 300457 | | LI Qun* | State Key Lab of Bio-based Fiber Materials, Tianjin Key Lab of Pulp and Paper, Tianjin University of Science and Technology, Tianjin, 300457 | 300457 |
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| Abstract:This study used chemi-mechanical bamboo pulp as raw material and adjusted lignin content （2.47%~18.67%） through acidic sodium chlorite treatment， followed by cationized modification using 2，3-epoxypropyltrimethylammonium chloride （EPTAC） as etherifying agent. The structure and properties of modified pulp were systematically characterized. The results showed that quaternary ammonium groups were successfully grafted onto pulp by EPTAC， with significantly increased Zeta potential. Lignin content showed positive correlation with degree of cationized substitution （DS of HPY0 was 0.098， decreasing to 0.078 for HPY180）. Antibacterial tests demonstrated that the inhibitory effect of cationized pulp against E.coli and S.aureus significantly enhanced with increasing lignin content， attributed to the natural antibacterial properties of lignin， physical piercing effect of large-sized nanofibers in high-lignin systems， and synergistic effect of cationized charges. |
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