木质素羟基化改性及其在聚氨酯合成中的应用

Hydroxylation of Lignin and Its Application in Synthesis of Polyurethane

关键词:  木质素  羟基化  聚氨酯  改性  机械性能

Key Words:lignin  hydroxylation  polyurethane  modification  mechanical properties

摘要:工业木质素主要来源于制浆和纤维素乙醇生物精炼的副产物，产量巨大；且木质素具有替代多元醇合成聚氨酯材料的应用潜力。对木质素进行羟基化改性，可以控制木质素分子质量和增加羟基含量，从而提高木质素的反应活性和在合成体系中的相容性，减少木质素在聚氨酯中的聚集，增加聚氨酯材料的微观均匀性，从而增强聚氨酯材料的机械性能；同时还可能赋予聚氨酯抗紫外、吸油、可降解等性能。本文对木质素基本理化性质进行简要介绍，重点介绍了目前国内外木质素羟基化改性方法的研究进展；最后探讨了木质素基聚氨酯合成领域的研究和应用前景。

Abstract:Industrial lignin with huge output was mainly derived from the by-products of pulping and cellulosic ethanol biorefinery， and it had the potential to replace polyol to synthetic polyurethane materials. The hydroxylation of lignin could control the molecular weight and increase the hydroxyl content of lignin， improving the reactivity of lignin and its compatibility in the synthesis system. It also could reduce the aggregation of lignin in the polyurethane， increase the micro-uniformity of the polyurethane materials to enhance the mechanical properties of the polyurethane materials. At the same time， it could also give polyurethane materials anti-ultraviolet， oil absorption， degradable and other properties. The basic physicochemical properties of lignin were briefly introduced， and the current research progress of lignin hydroxylation methods at home and abroad were also introduced. The research and application prospects in the field of synthesis of lignin-based polyurethane materials were discussed.