In order to realize the green and low-cost industrial production of acetylated lignin, this work proposes the heterogeneous reaction to acetylated lignin (ACAL) without catalysts and solvents at high temperature. The influence of reaction temperature and reaction time were investigated by IR, UV–vis, thermogravimetric analysis and water contact angle. Results showed that the optimum technological conditions were about 150 C and 6 h. The degree of acetylation and the amount of residual phenolic hydroxyl groups of ACAL was 2.49 and 34.2%, respectively. Compared with conventional acetylated lignin, the ACAL had similar hydrophobicity with a water contact angle of 62.0. The DTG peak of ACAL at about 200 C reduced to 0.07 than the traditional acetylated lignin. The tensile strength and elongation of poly-lactic acid with 5 wt% ACAL increased to 64.03 MPa and 10.80%, respectively. ACAL revealed a great potential for mass production and applications owing to the eco-friendly and cost-effective modified method.

为了实现乙酰化木质素的绿色、低成本工业化生产，本工作提出了在高温下无催化剂和溶剂的乙酰化木质素非均相反应（ACAL）。通过IR、UV-vis、热重分析和水接触角研究了反应温度和反应时间的影响。结果表明，最佳工艺条件约为150℃和6h。ACAL的乙酰化度和残留酚羟基量分别为2.49%和34.2%。与传统的乙酰化木质素相比，ACAL 具有相似的疏水性，水接触角为 62.0。ACAL 在 200 C 左右的 DTG 峰比传统的乙酰化木质素降低到 0.07。含 5 wt% ACAL 的聚乳酸的拉伸强度和伸长率提高到 64。分别为 03 MPa 和 10.80%。由于这种环保且具有成本效益的改良方法，ACAL 显示出大规模生产和应用的巨大潜力。