The development of a feasible and effective method to liquefy soybean protein with the potential to prepare particleboard for wood furniture remains challenging. In this work, different novel liquefaction technologies were proposed to prepare four different soybean protein liquefied products (noted as LSP-Ӏ, LSP-ӀӀ, LSP-ӀӀӀ, LSP-ӀV) that could be used as the matrix of the adhesives to satisfy spraying operation in particleboard industrial production. The effects of different liquefaction techniques on the molecular weight, chemical structure, crystalline degree and physicochemical properties were explored. Moreover, the boiling water-insoluble content, thermal stabilities and bonding properties of soybean protein-based adhesive prepared by LSP and cross-linker epichlorohydrin-modified polyamide (EMPA) were investigated. The results show that the particleboard bond with the “LSP-ӀV + EMPA” adhesive possesses excellent mechanical strength and dimensional stability which meets the industrial requirement of the particleboard according to the GB/T 4897–2015 commercial standard. Moreover, the liquefaction mechanism of the soybean protein solution with high solid content, low viscosity and suitable molecular weight was proposed, as the breaking of the intermolecular interactions by compound modifier effectively unfolded the polypeptide chains, and the polypeptide chains were uniformly and moderately degraded under mild alkaline conditions. Therefore, the “LSP-ӀV + EMPA” adhesive could be uniformly coated on the wood particles by the spraying process, and an effective cross-linking network system was formed during the hot pressing owing to appropriate molecular weight and more active groups of LSP-ӀV. The application prospect of soybean protein-based adhesives would be greatly broadened in the wood composite fields.

中文翻译：

---

评估基于大豆蛋白的粘合剂配方，通过不同的液化技术制备用于刨花板应用

开发一种可行且有效的方法来液化大豆蛋白并具有制备木制家具刨花板的潜力仍然具有挑战性。在这项工作中，提出了不同的新型液化技术来制备四种不同的大豆蛋白液化产品（标记为 LSP-Ӏ、LSP-ӀӀ、LSP-ӀӀӀ、LSP-ӀV），可用作粘合剂的基质以满足喷涂刨花板工业生产中的操作。探讨了不同液化技术对分子量、化学结构、结晶度和理化性质的影响。此外，研究了LSP和交联剂环氧氯丙烷改性聚酰胺(EMPA)制备的大豆蛋白基粘合剂的沸水不溶物含量、热稳定性和粘合性能。结果表明，采用“LSP-ӀV+EMPA”胶粘剂粘合的刨花板具有优异的机械强度和尺寸稳定性，符合GB/T 4897-2015商业标准对刨花板的工业要求。此外，提出了高固含量、低粘度、合适分子量的大豆蛋白溶液的液化机理，复合改性剂破坏分子间相互作用，有效地展开多肽链，使多肽链均匀适度地降解。弱碱性条件。因此，“LSP-ӀV + EMPA”粘合剂可以通过喷涂工艺均匀地涂覆在木颗粒上，由于适当的分子量和更多的LSP-ӀV活性基团，在热压过程中形成了有效的交联网络系统。大豆蛋白基胶粘剂在木材复合材料领域的应用前景将大大拓宽。