Traditional formaldehyde-based adhesives release toxic substances such as formaldehyde and phenol, which pollutes the environment, endangers human health, and relies on petrochemical resources excessively. Developing a strong soy protein adhesive with reasonable viscosity, toughness, and mildew resistance to replace formaldehyde-based adhesive is important and also a challenge for the industry of wood adhesive. In this study, a triple network structure including covalent bonds, hydrogen bonds and ionic bonds was built in soy protein adhesive. The results showed that compared with SPI adhesive, the viscosity of resultant adhesive decreased by 94.3% to 9952 mPa s, the dry and wet shear strength of resultant plywood increased by 33.9% (2.57 MPa) and 116% (1.36 MPa), respectively. The fracture strain of plywood increased by 36.4%, and the mildew resistance of adhesive increased from 1 day to more than 15 days. This improvement resulted from the adhesive's water resistance improvement by constructing the covalent network and the toughness increasing by the synergistic effect of hydrogen bonds and ionic bonds. This work provides a new method for the preparation of eco-friendly and high-performance adhesives and promotes the development of the green adhesive.

传统的甲醛基胶粘剂会释放有毒物质，例如甲醛和苯酚，污染环境，危害人体健康并过度依赖石油化学资源。开发具有适当粘度，韧性和耐霉菌性的强力大豆蛋白胶粘剂来代替甲醛基胶粘剂是重要的，也是木胶粘剂行业的一个挑战。在这项研究中，大豆蛋白胶中建立了包括共价键，氢键和离子键的三重网络结构。结果表明，与SPI胶粘剂相比，所得胶粘剂的粘度降低了94.3％至9952 mPa s，胶合板的干，湿剪切强度分别提高了33.9％（2.57 MPa）和116％（1.36 MPa）。胶合板的断裂应变增加了36.4％，胶粘剂的防霉性从1天提高到15天以上。这种改善是由于通过构建共价网络改善了粘合剂的耐水性，以及由于氢键和离子键的协同作用而增加了韧性。这项工作为制备环保和高性能胶粘剂提供了一种新方法，并促进了绿色胶粘剂的发展。