Preparation of wood formaldehyde-free adhesive by concentrated water delignification black liquor

IF 9.7 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Ting Zhang , Jianli Tan , Yongqi Li , Yexuan Tang , Yan He , Yuanyuan Ge , Xuemin Cui
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Abstract

Traditional lignin-based adhesives are difficult to widely use due to their poor mechanical properties and high modification costs. In this study, an aldehyde-free lignin-based adhesive (LAs) with excellent performance was developed by blending unmodified lignin, crosslinking agent 1,4-butanediol diglycidyl ether, and curing agent polyamide. The hydroxyl group of lignin, the epoxy group of the crosslinking, and the amino group of the curing agent cross-linked and solidified to form a three-dimensional macromolecular structure, which greatly enhanced the adhesive's mechanical strength and chemical stability. The highest dry board bonding strength, wet board bonding strength, and weather resistance strength of lignin-based adhesives were 5.55 MPa, 2.05 MPa, and 1.7 MPa, respectively, which met the Chinese national standard GB/T 9846-2015 (≥0.7 MPa). Additionally, the VOC test showed that the total organic volatile content of the adhesive was 30.5 g/L, which met the Chinese standard GB 18583-2008 (≤350 g/L). This formaldehyde-free preparation method without modifying lignin or synthesizing other resins opens up a new way for lignin-based adhesives and helps achieve high-value lignin utilization.
浓缩水脱木质素黑液制备木材无甲醛胶粘剂
传统木质素基胶粘剂力学性能差,改性成本高,难以广泛应用。本研究将未经改性的木质素、交联剂1,4-丁二醇二甘油酯醚和固化剂聚酰胺共混,制备了性能优良的无醛木质素基胶粘剂。木质素的羟基、交联的环氧基、固化剂的氨基交联固化,形成三维大分子结构,大大增强了胶粘剂的机械强度和化学稳定性。木质素基胶粘剂的最高干板粘接强度为5.55 MPa,最高湿板粘接强度为2.05 MPa,最高耐候性强度为1.7 MPa,符合中国国家标准GB/T 9846-2015(≥0.7 MPa)。另外,VOC测试表明,该胶粘剂的总有机挥发物含量为30.5 g/L,符合中国标准GB 18583-2008(≤350 g/L)。这种不需要改性木质素或合成其他树脂的无甲醛制备方法为木质素基胶粘剂开辟了一条新途径,有助于实现木质素的高价值利用。
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来源期刊
Journal of Cleaner Production
Journal of Cleaner Production 环境科学-工程:环境
CiteScore
20.40
自引率
9.00%
发文量
4720
审稿时长
111 days
期刊介绍: The Journal of Cleaner Production is an international, transdisciplinary journal that addresses and discusses theoretical and practical Cleaner Production, Environmental, and Sustainability issues. It aims to help societies become more sustainable by focusing on the concept of 'Cleaner Production', which aims at preventing waste production and increasing efficiencies in energy, water, resources, and human capital use. The journal serves as a platform for corporations, governments, education institutions, regions, and societies to engage in discussions and research related to Cleaner Production, environmental, and sustainability practices.
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