Chen Shiqing, Chen Yuan, Wang Zongtao, Chen Huan, Fan Dongbin
Research Institute of Wood Industry, Chinese Academy of Forestry Beijing 100091 China
RSC Adv. 2021 Mar 23;11(19):11724-11731. doi: 10.1039/d1ra00766a. eCollection 2021 Mar 16.
In this study, a bio-based soy protein adhesive derived from environmentally friendly and renewable enzymatic hydrolysis lignin (EHL), epoxidized soybean oil (ESO), and soy protein isolate (SPI), was successfully prepared. A novel biopolymer (EHL-ESO), as a multifunctional crosslinker, was firstly synthesized from modified EHL and ESO, and then crosslinked with soy protein isolate to obtain a bio-based soy protein adhesive. The structure, thermal properties, and adhesion performance of the obtained soy protein adhesives were determined by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and wet shear strength. The maximum degradation temperature of SPI/EHL-ESO adhesives (332-343 °C) was higher than that of the pristine SPI adhesive (302 °C). Moreover, plywood bonded by the modified adhesive reached a maximum wet shear strength value of 1.07 MPa, a significant increase of 101.8% from the plywood bonded by pristine SPI adhesive. The enhancements in the thermal stability and wet shear strength were attributed to the formation of a dense crosslinking network structure. This work not only highlights the potential to replace petroleum-based polymers, but also presents a green approach to fabricate fully bio-based soy protein adhesive for preparing all-biomass wood composite materials.
在本研究中，成功制备了一种基于生物的大豆蛋白胶粘剂，其由环境友好且可再生的酶解木质素（EHL）、环氧化大豆油（ESO）和大豆分离蛋白（SPI）衍生而来。首先，由改性的EHL和ESO合成了一种新型生物聚合物（EHL - ESO）作为多功能交联剂，然后将其与大豆分离蛋白交联以获得一种基于生物的大豆蛋白胶粘剂。通过傅里叶变换红外光谱（FTIR）、热重分析（TGA）、扫描电子显微镜（SEM）和湿剪切强度来测定所得大豆蛋白胶粘剂的结构、热性能和粘附性能。SPI/EHL - ESO胶粘剂的最高降解温度（332 - 343℃）高于原始SPI胶粘剂的最高降解温度（302℃）。此外，用改性胶粘剂粘结的胶合板达到了1.07 MPa的最大湿剪切强度值，比用原始SPI胶粘剂粘结的胶合板显著提高了101.8%。热稳定性和湿剪切强度的提高归因于致密交联网络结构的形成。这项工作不仅突出了替代石油基聚合物的潜力，还提出了一种绿色方法来制备全生物基大豆蛋白胶粘剂以制备全生物质木材复合材料。
