Crosslinking modification can effectively improve the water resistance of soy protein isolate (SPI) adhesive, but it often depends on petroleum-based reagents, violating the concept of green environmental protection. Here, inspired by the breaking and recombination of the disulfide bond in the perm process, a high-performance wood adhesive is prepared by incorporation of SPI (modified by sodium sulfite to cleave the disulfide bonds of protein chains) and feather keratin (FK, extracted from waste chicken feathers by breaking the disulfide bond) without using any other crosslinkers. The crosslinking reaction occurs by disulfide bonds derived from the sulfhydryl group of FK and SPI. Thus the wet shear strength of the SPI/FK-20 adhesive is improved from 0.57 to 1.18 MPa, an increment of 107%. This study provides a green strategy to prepare high-performance protein-based adhesive from the waste products-chicken feathers, which will contribute to the development of the environmentally friendly wood adhesive industry.

中文翻译：

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受烫发启发的高性能大豆分离蛋白和鸡毛角蛋白基木材粘合剂，不含外部交联剂

交联改性可有效提高大豆分离蛋白（SPI）胶的耐水性，但往往依赖石油类试剂，违反绿色环保理念。在这里，受到烫发过程中二硫键的断裂和重组的启发，通过掺入SPI（亚硫酸钠改性以裂解蛋白质链的二硫键）和羽毛角蛋白（FK，提取）制备高性能木材粘合剂通过破坏二硫键从废鸡毛中提取），而无需使用任何其他交联剂。交联反应通过衍生自 FK 和 SPI 的巯基的二硫键发生。因此SPI/FK-20胶粘剂的湿剪切强度从0.57 MPa提高到1.18 MPa，增加了107%。