Introduction of aldehyde groups into surface of pine bark via Cannizzaro reaction to improve Urea-formaldehyde resin properties,Industrial Crops and Products

当前位置： X-MOL 学术 › Ind. Crops Prod. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Introduction of aldehyde groups into surface of pine bark via Cannizzaro reaction to improve Urea-formaldehyde resin properties
Industrial Crops and Products ( IF 5.6 ) Pub Date : 2024-07-24 , DOI: 10.1016/j.indcrop.2024.119142
Heng Tian , Linan Zheng , Chenglong Li , Yuanbo Gui , Wenzhuo Zhang , Shaoqiu Zeng , Fanglin Li , Wei Liu , Lianhua Li , Guanchang Wang , Wenhan Xu , Jiepei Liang , Zhengjie Tang , Guanben Du , Xiaojian Zhou

Pine bark, a natural and renewable forest residue, was modified using a simple interfacial solid-phase chemical method to design a highly chemically reactive additive for urea-formaldehyde (UF) resin. The modification introduced carbonyl groups onto the bark surface during the glyoxal reaction at the bark-solid interface. Thermal properties, including curing temperatures, of UF, UFB, and UFGB were evaluated using DSC and DMA. Glyoxal modification of bark significantly influenced these properties, facilitating the crosslinking and curing of adhesives. Notably, plywood bonded with UFGB resin released approximately half as much formaldehyde (52.89 % less) compared to plywood bonded with UF resin, reducing from 1.38 to 0.65 mg/L. Additionally, the wet shear strength of plywood increased by 197.3 %, from 0.37 MPa to 1.10 MPa, exceeding the minimum requirement (0.7 MPa) defined by the China national standard (GB/T 17657–2013). The study presents a compelling case for the utilization of glyoxal-modified pine bark as a filler in UF adhesive for plywood manufacturing. The demonstrated improvements in plywood properties and formaldehyde emissions, along with the environmentally friendly nature of the approach, make it a promising avenue for sustainable plywood production. Further investigations into the underlying mechanisms and long-term performance are encouraged to solidify the potential of this technology.

更新日期：2024-07-24

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南