| 张宏宇,倪书振,张永超,陈晓倩,王兆江,秦梦华.类木质素母体小分子对甲酸体系下纤维素酯化反应及纸浆可漂性的影响[J].中国造纸,2025,44(10):41-49 |
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| 类木质素母体小分子对甲酸体系下纤维素酯化反应及纸浆可漂性的影响 |
| Effects of Lignin Parent Small Molecules on Cellulose Esterification and Pulp Bleachability in Formic Acid Systems |
| 收稿日期：2025-04-28 修订日期：2025-05-21 |
| DOI：10.11980/j.issn.0254-508X.2025.10.005 |
| 关键词: 甲酸 类木质素母体小分子 纤维素甲酸酯 漂白 |
| Key Words:formic acid lignin parent small molecules cellulose formate bleaching |
| 基金项目:国家自然科学基金青年科学基金项目（02056294，32271821）；全国重点实验室建设重大科研专项（2025ZDGZ02）；济南高校二十条创新团队项目（202228076）。 |
| 作者 | 单位 | 邮编 | | 张宏宇* | 齐鲁工业大学（山东省科学院）绿色造纸与资源循环全国重点实验室,山东济南,250353
齐鲁师范学院化学与化工学院,山东济南,250200 | 250200 | | 倪书振* | 齐鲁工业大学（山东省科学院）绿色造纸与资源循环全国重点实验室,山东济南,250353
齐鲁师范学院化学与化工学院,山东济南,250200 | 250200 | | 张永超* | 齐鲁工业大学（山东省科学院）绿色造纸与资源循环全国重点实验室,山东济南,250353
齐鲁师范学院化学与化工学院,山东济南,250200 | 250200 | | 陈晓倩 | 齐鲁工业大学（山东省科学院）绿色造纸与资源循环全国重点实验室,山东济南,250353
齐鲁师范学院化学与化工学院,山东济南,250200 | 250200 | | 王兆江 | 齐鲁工业大学（山东省科学院）绿色造纸与资源循环全国重点实验室,山东济南,250353
齐鲁师范学院化学与化工学院,山东济南,250200 | 250200 | | 秦梦华* | 齐鲁师范学院化学与化工学院,山东济南,250200 | 250200 |
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| 摘要:本研究采用类木质素母体小分子与甲酸组成的蒸煮体系探究蒸煮反应对纤维素结构影响，同时采用微晶纤维素模拟微观实验，对蒸煮后纤维素结构进行表征，探究甲酸体系下纤维素酯键含量，推测酯化反应发生位置，构建纸浆白度与漂白体系pH的关系。结果表明，添加不同类木质素母体小分子与甲酸组成的蒸煮体系，在单一甲酸体系下，纤维素与甲酸酯化程度更高，纤维素上酯键含量为7.01%左右；根据核磁分析推测纤维素酯化发生在C2、C3和C6位。对蒸煮后的纸浆进行漂白发现，与未漂白纸浆相比，经6% NaOH和2% H2O2漂白后，纸浆白度由71.3%增加到81.4%，抗张指数由31. 5 N·m/g降低到26.9 N·m/g。同时发现，添加类木质素母体小分子后蒸煮得到的纸浆与单一甲酸蒸煮得到的纸浆相比有相对较小的接触角，说明单一甲酸蒸煮会在纤维素表面生成更多的酯键。 |
| Abstract:In this study， the cooking system composed of lignin-like parent small molecules and formic acid was used to explore the effect of cooking reaction on cellulose structure. At the same time， the microcrystalline cellulose simulation micro-experiment was used to characterize the cellulose structure after cooking. The content of cellulose ester bond in formic acid system was explored， the position of esterification reaction was speculated， and the relationship between pulp whiteness and pH of bleaching system was constructed. The results showed that the esterification rate of cellulose was about 7.01% under a single formic acid system， in the cooking system with different types of lignin parent small molecules and formic acid. According to NMR analysis， it was speculated that cellulose esterification occurred in C2，C3 and C6 bonds. After conducting bleaching on the cooked pulp， it was discovered that compared with the unbleached pulp， after adding 6% NaOH and 2% H2O2， the brightness of the pulp increased from 71.3% to 81.4%， and the tensile index decreased from 31.5 N·m/g to 26.9 N·m/g. At the same time， it was found that the pulp obtained by adding lignin-like parent small molecules had a relatively small contact angle compared with the pulp obtained by single formic acid cooking， indicating that single formic acid cooking would generate more ester bonds on the cellulose surface. |
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