Department of Wood and Paper Science, Kyungpook National University, Daegu 41566, Republic of Korea.
Department of Wood and Paper Science, Kyungpook National University, Daegu 41566, Republic of Korea.
Bioresour Technol. 2024 May;399:130645. doi: 10.1016/j.biortech.2024.130645. Epub 2024 Mar 28.
Hardwood kraft lignin from the pulping industry is burned or discarded. Its valorization was conducted by subjecting fractionation, amination with ethylenediamine, diethylenetriamine, and monoethanolamine, and crosslinking with formaldehyde or glyoxal to obtain bio-based wood adhesives. Acetone-soluble and insoluble hardwood kraft lignin were prepared and subjected to amination and then crosslinking. Fourier transform infrared, C NMR, N NMR, and X-ray photoelectron spectroscopy results revealed successful amination with amide, imine, and ether bonds and crosslinking of all samples. Hardwood kraft lignin aminated with diethylenetriamine/ethylenediamine and crosslinked using glyoxal exhibited excellent results in comparison with samples crosslinked using formaldehyde. Acetone-insoluble hardwood kraft lignin aminated and crosslinked using diethylenetriamine and formaldehyde, respectively, exhibited excellent adhesion strength with plywood, satisfying the requirements of the Korean standards. The amination and crosslinking of industrial waste hardwood kraft lignin constitute a beneficial valorization method.
制浆工业产生的硬木硫酸盐木质素通常被燃烧或丢弃。为了实现其增值利用，我们对其进行了分级处理，并采用乙二胺、二乙烯三胺和单乙醇胺进行胺化，然后用甲醛或乙二醛进行交联，从而得到了基于生物的木材胶粘剂。我们制备了丙酮可溶和不溶的硬木硫酸盐木质素，并对其进行了胺化和交联处理。傅里叶变换红外、C NMR、N NMR 和 X 射线光电子能谱结果表明，所有样品均成功进行了酰胺、亚胺和醚键的胺化以及交联反应。与使用甲醛交联的样品相比，使用乙二醛交联的二乙烯三胺/乙二胺胺化的硬木硫酸盐木质素表现出优异的性能。分别使用二乙烯三胺和甲醛对丙酮不溶的硬木硫酸盐木质素进行胺化和交联处理后，胶合板的胶合强度优异，满足韩国标准的要求。工业废料硬木硫酸盐木质素的胺化和交联构成了一种有益的增值利用方法。
