文献类型：期刊文献

中文题名：木质素-苯酚-尿素-甲醛共聚树脂合成研究

英文题名：Synthesis of lignin-phenol-urea-formaldehyde co-polymer resin adhesive

作者：杨昇[1] 付跃进[1] 袁同琦[2]

第一作者：杨昇

机构：[1]中国林业科学研究院木材工业研究所,北京100091;[2]北京林业大学林木生物质化学北京市重点实验室,北京100083

年份：2021

卷号：41

期号：12

起止页码：130-137

中文期刊名：中南林业科技大学学报

外文期刊名：Journal of Central South University of Forestry & Technology

收录：CSTPCD;;北大核心:【北大核心2020】；CSCD:【CSCD_E2021_2022】；

基金：国家重点研发计划项目(2017YFB0307903);国家自然科学基金项目(31670587)。

语种：中文

中文关键词：木质素;碱性条件;合成;多组分;共缩聚树脂

外文关键词：lignin;alkaline condition;synthesis;multicomponent;co-polymer resin

分类号：S75;TQ35

摘要：【目的】合成共聚型树脂是融合多种树脂体系优势,制造环保性能良好且廉价木材胶黏剂的有效方法。本研究力图实现碱性条件下木质素-苯酚-尿素-甲醛四元共缩聚树脂胶黏剂体系的构建。【方法】通过核磁共振及基质辅助激光解吸飞行时间质谱技术分析树脂产物,探索树脂合成反应路径选择与树脂分子结构构建及胶合产品性能的相关性。【结果】碱性条件下可以成功构建木质素-苯酚-尿素-甲醛四元共缩聚树脂体系。在合成原料配比相同的条件下,以脲醛树脂合成为起点制备共缩聚树脂比以酚醛树脂合成为起点更有助于多组分分子间共缩聚连接结构的形成,但未发现共缩聚结构与树脂性能直接相关。以酚醛树脂合成为起点得到的共缩聚树脂比以脲醛树脂合成为起点得到的共缩聚树脂易固化,但由其制得的胶合板的甲醛释放量相对较高。木质素的加入可显著降低共缩聚树脂胶合产品的甲醛释放量。【结论】共缩聚树脂合成路径及产物分子结构对终端产品性能有显著影响,且在低温固化时体现得尤为明显,高温固化时树脂分子结构带来的性能差异相对较小。以脲醛树脂合成为起点制备的共缩聚树脂固化时主要体现的是酚醛树脂的固化特点,而以酚醛树脂合成为起点制备的共缩聚树脂固化过程中主要体现脲醛树脂的固化特点。
【Objective】The advantages of various resins can be combined together via the synthesis of co-polymer products. An environmentally friendly and cheap wood adhesives could be prepared through this approach. The objective of this study was the preparation of lignin-phenol-urea-formaldehyde co-polymer resin under alkaline conditions.【Method】The synthesized resins were measured with nuclear magnetic resonance and matrix-assisted laser desorption time of flight mass spectrometry. The relationship of the structural features and performances of the co-polymer resins and the synthesis routes were analyzed.【Result】Lignin-phenolurea-formaldehyde co-polymer resin system can be successfully constructed under alkaline conditions. The co-condensation was easily formed in the process starting from urea-formaldehyde resin synthesis. The co-condensation structure of the resins was not directly related to their performances. The co-polymer resins obtained from the process starting from phenol-formaldehyde resin synthesis provided better physical performance than those obtained from the process starting from urea-formaldehyde resin synthesis. However,the formaldehyde emissions of the wood products prepared with them were relatively high. The lignin could be successfully embedded into co-polymer resin system under alkaline conditions, and the formaldehyde emissions of the co-polymer resins could be significantly reduced after the addition of lignin.【Conclusion】The physical performance of wood products was significantly influenced by the synthesis path and molecular structure of copolymer resin adhesive, especially in the case of low temperature curing. The differences of performance caused by the molecular structure of the resin were relatively small when curing at high temperatures. The curing process of the co-polymer resin prepared from the synthesis of urea formaldehyde resin mainly shows the characteristics of phenolic resin,while the curing process of the co-polymer resin prepared from the synthesis of phenolic resin mainly shows the characteristics of urea formaldehyde resin.