Preparation and application research of improved water-resistant cellulose nanofibers adhesive
Cellulose nanofibers(CNF),as a kind of biomass material,contain a large number of hydroxyl groups on their surface,which naturally have the ability to bond to polar surfaces.However,CNF containing only hydroxyl groups has low bonding strength and is not easy to bond with water molecules,which affects cohesion and adhesion.In response to this situation,in this study,based on the characteristics of chemical bonding between polyethyleneimine(PEI)and tannic acid(TA)in a very short time and the ability to form chain entanglement,tannic acid was added to the surface of CNF,CNF-TA-PEI adhesive was prepared through physical blending method,and the stability and water resistance of the adhesive were investigated.The research results showed that when m(TA):m(PEI)=60:40,although CNF-TA-PEI adhesive was soaked in water for 14 days,the measured bonding strength still reached(140.7±7.3)kPa.After soaking for more than 21 days,its bonding performance showed a continuous downward trend,and the measured strength value was(61.9±1.4)kPa at 28 days.The above results indicated that CNF-TA-PEI adhesive had good interface adhesion and water resistance,and had certain application prospects in practice.
万方数据
维普
