Synthesis of Lignin-Based Polyacid in an Acidic Ionic Liquid: A Green Method to Improve the Performance of Lignin as Catalyst in Urea-Formaldehyde Resin  

作　　者：Hamed Younesi-Kordkheili Antonio Pizzi 

机构地区：[1]Department of Wood and Paper Sciences,Faculty of Natural Resources,Semnan University,Semnan,Iran [2]LERMAB,University of Lorraine,Epinal,France

出　　处：《Journal of Renewable Materials》2022年第2期237-246,共10页可再生材料杂志（英文）

摘　　要：The aim of this research was to investigate the effect of ionic liquid treated lignin-based polyacid as a catalyst for urea-formaldehyde(UF)resins.Esterification of lignin was carried out,without any catalyst,with anhydride maleic and 1-butyl-3-methylimidazolium hydrogen sulfate[Bmim][HSO 4]as acidic ionic liquid to form maleated lignin-based polyacids(MA-IL).The performance of MA-IL as UF resin catalyst was respectively compared to hyroxymethylated lignin-based polyacid(MA-HL)and to NH 4 Cl.The FTIR analysis indicated that the propor-tion of-COOH and C-O bonds increased due to the esterification of lignin with ionic liquid rather than its hyr-oxymethylation.Physicochemical tests indicated that the gelation time of the UF resin was shorter by adding MA-IL when compared to NH 4 Cl and MA-HL,respectively.DSC analysis showed that the addition of MA-IL significantly decreased the temperature peak(Tp)of the UF resin;as the Tp of the UF resin with 2 wt%MA-IL was lower than with MA-HL and NH 4 Cl,respectively.The panel test results of plywood bonded with a UF resin with a MA-IL level increasing from 1%to 3%,effectively improved the mechanical strength,water resistance and formaldehyde emission even higher than with MA-HL and NH 4 Cl,respectively.

关 键 词：Lignin-based polyacid maleic anhydride ionic liquid ESTERIFICATION PLYWOOD 

分 类 号：O61[理学—无机化学]