Pang Huiwen, Ma Chao, Zhang Shifeng
MOE Key Laboratory of Wooden Material Science and Application and Key Laboratory of Wood Science and Engineering, Beijing Forestry University, Beijing 100083, PR China.
MOE Key Laboratory of Wooden Material Science and Application and Key Laboratory of Wood Science and Engineering, Beijing Forestry University, Beijing 100083, PR China.
Int J Biol Macromol. 2022 Jun 1;209(Pt A):83-92. doi: 10.1016/j.ijbiomac.2022.03.152. Epub 2022 Mar 26.
As a soybean oil extractive byproduct, high temperature defatted soy meal (HSM) presents great potential as a raw material for vegetable protein adhesives to replace aldehyde-based adhesives in the wood-based panel production. However, the application has been hindered by its poor cold-pressing adhesive performance. Herein, a novel HSM-based adhesive with excellent cold-pressing adhesion performance was developed based on mussel-inspired cation-π interactions. Highly reactive polyamidoamine-epichlorohydrin (PAE) and folic acid (FA) were added into an HSM-based adhesive to construct a dual-network system stabilized by strong cation-π interactions. The coacervate formed by PAE and FA served as an "internal adhesive" to bond HSM particles together, yielding high initial viscosity but easy sizing. As expected, the prepared adhesive exhibited an excellent cold-pressing bonding strength of 423 kPa, showing a 295% improvement compared to the soy protein (SP) adhesive. To improve the hot-pressing bonding strength of the adhesives, inorganic calcium carbonate (CaCO) particles were introduced into the adhesive system to build an organic-inorganic hybrid adhesive system. The wet shear strength of the SPAE-FA-CaCO adhesive significantly improved from 0.63 MPa to 0.96 MPa, meeting the requirements for the practical application. This method provides a novel strategy to exploit high-performance vegetable protein-based wood adhesives.
作为大豆油提取的副产品，高温脱脂豆粕（HSM）作为植物蛋白胶粘剂的原料具有巨大潜力，可在人造板生产中替代醛基胶粘剂。然而，其较差的冷压粘合性能阻碍了该应用。在此，基于贻贝启发的阳离子-π相互作用，开发了一种具有优异冷压粘合性能的新型HSM基胶粘剂。将高反应性聚酰胺多胺-环氧氯丙烷（PAE）和叶酸（FA）添加到HSM基胶粘剂中，构建由强阳离子-π相互作用稳定的双网络体系。PAE和FA形成的凝聚层作为“内胶粘剂”将HSM颗粒粘结在一起，产生高初始粘度但施胶容易。正如预期的那样，制备的胶粘剂表现出423 kPa的优异冷压粘合强度，与大豆蛋白（SP）胶粘剂相比提高了295%。为了提高胶粘剂的热压粘合强度，将无机碳酸钙（CaCO）颗粒引入胶粘剂体系，构建有机-无机杂化胶粘剂体系。SPAE-FA-CaCO胶粘剂的湿剪切强度从0.63 MPa显著提高到0.96 MPa，满足实际应用要求。该方法为开发高性能植物蛋白基木材胶粘剂提供了一种新策略。
