Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials, Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery, College of Light, Industry and Chemical Engineering, Dalian Polytechnic University, Dalian, 116034, China.
State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, China.
Macromol Rapid Commun. 2024 May;45(9):e2300663. doi: 10.1002/marc.202300663. Epub 2024 Mar 3.
As the second most abundant biopolymer, lignin remains underutilized in various industrial applications. Various forms of lignin generated from different methods affect its physical and chemical properties to a certain extent. To promote the broader commercial utilization of currently available industrial lignins, lignin sulfonate (SL), kraft lignin (KL), and organosolv lignin (OL) are utilized to partially replace phenol in the synthesis of phenol formaldehyde (PF) adhesives. The impact of lignin production process on the effectiveness of lignin-based phenolic (LPF) adhesives is examined based on the structural analysis of the selected industrial lignin. The results show that OL has more phenolic hydroxyl groups, lower molecular weight, and greater number of reactive sites than the other two types of lignins. The maximum replacement rate of phenol by OL reaches 70% w/w, resulting in organosolv lignin phenolic (OLPF) adhesives with a viscosity of 960 mPa·s, a minimal free formaldehyde content of 0.157%, and a shear strength of 1.84 MPa. It exhibits better performance compared with the other two types of lignin-based adhesives and meets the requirements of national standards.
作为第二丰富的生物聚合物，木质素在各种工业应用中仍未得到充分利用。不同方法产生的各种形式的木质素在一定程度上影响其物理和化学性质。为了促进更广泛地商业利用现有的工业木质素，木质素磺酸盐（SL）、硫酸盐木质素（KL）和有机溶剂木质素（OL）被部分替代酚醛合成中的酚醛（PF）胶黏剂中的酚。通过对所选工业木质素的结构分析，考察了木质素生产工艺对木质素基酚醛（LPF）胶黏剂效果的影响。结果表明，OL 比其他两种木质素具有更多的酚羟基、更低的分子量和更多的反应性位点。OL 对酚的最大替代率达到 70%w/w，得到的有机溶剂木质素酚醛（OLPF）胶黏剂的黏度为 960 mPa·s，游离甲醛含量最低为 0.157%，剪切强度为 1.84 MPa。与其他两种木质素基胶黏剂相比，它具有更好的性能，符合国家标准的要求。
