The development of bio-based adhesives comprised of low-cost, renewable, and accessible biomass resources with high adhesion and toughness is needed in wood-based panel industry. Herein, a novel cationic waterborne polyurethane (CWPU) emulsion was prepared with a hydrophobic long alkyl chain and catechol structure via thiol-ene click reaction and direct emulsification. Then, the obtained emulsions were applied as efficient crosslinkers to enhance the bonding performance of soybean meal (SM) adhesives. The catechol group on polyurethane acted as a secondary reaction platform that formed multiple hydrogen bonds with protein molecules to optimize the mechanical strength and adhesion toughness of the SM resins. In addition, the hydrophobic alkyl chains grafted intertwine and served as a “water-proofer” that hindered the intrusion of water molecules. Consequently, the modified SM/HD@CCWPU resin presented an impressive improvement in its wet bonding strength and toughness to 165.9% and 378.1%, respectively, compared with the pure SM resin. This efficient, ecofriendly, and low-cost design enables the utilization of agricultural byproducts instead of traditional formaldehyde-based products to prepare high-performance adhesives.

人造板行业需要开发由低成本、可再生、可获取的生物质资源组成的具有高粘附性和韧性的生物基粘合剂。在此，通过硫醇-烯点击反应和直接乳化制备了一种具有疏水性长烷基链和邻苯二酚结构的新型阳离子水性聚氨酯（CWPU）乳液。. 然后，将所得乳液用作有效的交联剂，以提高豆粕（SM）粘合剂的粘合性能。聚氨酯上的儿茶酚基团作为二级反应平台，与蛋白质分子形成多个氢键，以优化 SM 树脂的机械强度和粘合韧性。此外，接枝的疏水性烷基链相互缠绕，起到“防水剂”的作用，阻碍水分子的侵入。因此，与纯 SM 树脂相比，改性 SM/HD@CCWPU 树脂的湿粘合强度和韧性分别提高了 165.9% 和 378.1%。这种高效、环保、