1 College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China; 2 Guangxi Fenglin Wood Industry Group Co. Ltd., Nanning 530031, China; 3 Dare Wood-based Panel Group Co. Ltd., Zhenjiang 212300, China
Abstract: In order to expand the application field of starch and reduce the free formaldehyde content of urea-formaldehyde resin adhesive, urea-dialdehyde starch-formaldehyde (UDSF) copolycondensation resin adhesive was prepared by copolycondensation of dialdehyde starch with urea and formaldehyde. The effects of the amount of dialdehyde starch, the first copolymerization time and the first urea ratio (F/U1) on the solid content, viscosity, water solubility, curing time and free formaldehyde content of the adhesives were investigated. By comparing with urea-starch-formaldehyde (USF), it was concluded that when the amount of dialdehyde starch was 0.075 mol, the first copolymerization time was 60 min and F/U1 was 1.5, the UDSF resin adhesive had better operational performance, faster curing rate, better environmental protection performance, bonding strength and water resistance to meet the requirements of class II plywood. Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and thermogravimetric analyzer (TGA) were used to compare UDSF resin adhesives and USF resin adhesives. The results showed that dialdehyde starch had higher reactivity with urea and formaldehyde than native starch, and the copolycondensation reaction was more sufficient. The polymerization degree and crosslinking of UDSF resin were significantly improved, making UDSF resin a continuous homogeneous system. It was explained the internal reasons of shortening curing time, decreasing free formaldehyde content, improving bonding strength and heat resistance of UDSF resin adhesive. At the same time, the decrease of free -OH and the increase of association -OH in UDSF resin verify the improvement of water resistance of UDSF resin adhesive.
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2020, Vol. 34 
