尿素-双醛淀粉-甲醛共缩聚树脂胶黏剂的制备与性能表征

doi:10.11896/cldb.19070137

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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.

Key words： dialdehyde starch urea formaldehyde resin copolycondensation adhesive

Published: 25 April 2020

CLC number:

TQ316.4

Fund:This work was financially supported by the Major Science and Technology Program of Hunan Province (2017NK1010), Science and Technology Innovation Project for College Students of Central South University of Forestry and Technology.

About author:: Yingfeng Zuoreceived his Ph.D. degree in enginee-ring from Northeast Forestry University in 2014. He is currently an associate professor in Central South University of Forestry and Technology. His research interests are modification of biomass composites and adhesives.
Yiqiang Wuis currently a professor and doctoral supervisor in Central South University of Forestry and Technology, and he is special professor of Cheung Kong Scholars Programme. His research interests are wood and bamboo processing and utilization, biomass composite materials.
Guangming Yuan is currently a professor and doctoral supervisor in Central South University of Forestry and Technology. His research interests are wood processing and utilization, biomass composite materials.

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	ZUO Yingfeng
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Cite this article:

ZUO Yingfeng,TU Ruru,WU Yiqiang, et al. Preparation and Characterization of Urea-Dialdehyde Starch-Formaldehyde Copolycondensation Resin Adhesive[J]. Materials Reports, 2020, 34(8): 8172-8178.

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http://www.mater-rep.com/EN/10.11896/cldb.19070137 OR http://www.mater-rep.com/EN/Y2020/V34/I8/8172

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