| 王宁,周雪松.木质素的碱催化水热降解及其在酚醛树脂胶黏剂中的应用[J].中国造纸,2025,44(9):1-7 |
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| 木质素的碱催化水热降解及其在酚醛树脂胶黏剂中的应用 |
| Alkali-catalyzed Hydrothermal Degradation of Lignin and Its Application to Phenolic Resin Adhesives |
| 收稿日期：2025-04-14 修订日期：2025-06-11 |
| DOI：10.11980/j.issn.0254-508X.2025.09.001 |
| 关键词: 木质素 水热降解 酚醛树脂 胶黏剂 |
| Key Words:lignin hydrothermal degradation phenolic resin adhesives |
| 基金项目: |
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| 摘要点击次数: 1944 |
| 全文下载次数: 812 |
| 摘要:通过碱催化水热处理法降解乙酸木质素（AAL），在调控相对分子质量的同时，提高其活性官能团含量。以水热降解后的低分子质量乙酸木质素（DAAL）替代部分苯酚与甲醛交联，制备木质素基酚醛（DLPF）树脂胶黏剂。通过研究反应温度、反应时间、碱用量等水热处理条件对DAAL的分子质量、酚羟基和甲氧基等活性基团的影响，分析了木质素水热降解对木质素基酚醛树脂胶合强度、热稳定性及游离甲醛含量等理化特性的作用效果。结果表明，当水热降解条件为碱用量20%（相对于木质素质量分数）、反应温度200 ℃、反应时间150 min时，DAAL中的酚羟基含量较高、甲氧基含量较低，数均相对分子质量从9 789降低至3 392；以其制备的DLPF性能最佳，胶合强度为1.35 MPa，游离甲醛和游离苯酚含量分别为0.11%和0.54%。 |
| Abstract:Acetate lignin (AAL) was degraded by hydrothermal treatment with the aim of increasing its reactive functional group content while regulating its relative molecular weight， and replacing part of phenol with the low-molecular-weight acetate lignin (DAAL) obtained through hydrothermal degradation to prepare lignin-based phenolic (DLPF) resin adhesive. The effects of hydrothermal treatment conditions， such as reaction temperature， reaction time， and alkali dosage， on the molecular weight， phenolic hydroxyl and methoxyl content of acetate lignin were investigated. The effects of lignin hydrothermal degradation on the physical and chemical properties of lignin-based phenolic resin adhesives， such as woodchip bonding strength， thermal stability， and free formaldehyde content were analyzed. The results showed that when the hydrothermal degradation conditions were 20% alkali content (relative to the lignin mass fraction)， reaction temperature of 200 ℃ and reaction time of 150 min， the phenolic hydroxyl content in DAAL was higher and the methoxy content was lower， and the number-average molecular weight decreased from 9 789 to 3 329； the performance of DLPF prepared with degraded lignin was the best， with a woodchip bonding strength of 1.35 MPa， and the free formaldehyde and free phenol contents were 0.11% and 0.54%， respectively. |
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