文献类型：期刊文献

英文题名：Synthesis of Lignin-Based Polyacid Catalyst and Its Utilization to Improve Water Resistance of Urea-formaldehyde Resins

作者：Gao, Shishuai[1,2,3,4] Liu, Yupeng[1,2,4] Wang, Chunpeng[1,2,4] Chu, Fuxiang[1,2,4] Xu, Feng[3] Zhang, Daihui[1,2,4]

第一作者：Gao, Shishuai;高士帅

通信作者：Chu, FX[1];Zhang, DH[1];Chu, FX[2];Zhang, DH[2];Xu, F[3];Chu, FX[4];Zhang, DH[4]|[a0005728d87cb2daf502d]储富祥;

机构：[1]Chinese Acad Forestry, Natl Engn Lab Biomass Chem Utilizat, Nanjing 210042, Peoples R China;[2]Chinese Acad Forestry, Key Lab Chem Engn Forest Prod, Natl Forestry & Grassland Adm, Key Lab Biomass Energy & Mat,Inst Chem Ind Forest, Nanjing 210042, Peoples R China;[3]Beijing Forestry Univ, Coll Mat Sci & Technol, Beijing 100083, Peoples R China;[4]Nanjing Forestry Univ, Coinnovat Ctr Efficient Proc & Utilizat Forest Re, Nanjing 210037, Peoples R China

年份：2020

卷号：12

期号：1

外文期刊名：POLYMERS

收录：;EI(收录号：20200508100033);Scopus(收录号：2-s2.0-85078458323);WOS:【SCI-EXPANDED(收录号:WOS:000519848300174)】；

基金：We acknowledge the support from Jiangsu Key Laboratory for Biomass Energy and Materials (JSBEM-S-201901), National Key R&D Program of China (2017YFE0106800), and National Natural Science Foundation of China (31890774).

语种：英文

外文关键词：lignin; catalyst; urea-formaldehyde resin; adhesive

摘要：In this study, a lignin-based polyacid catalyst was synthesized via two steps to enhance water resistance of urea-formaldehyde (UF) resins. The first steps involved a hydroxymethylation reaction to increase the hydroxyl content in lignin. Then, hydroxymethylated lignins were reacted with maleic anhydride to form maleated lignin-based polyacids. The acid groups were expected to function as acid catalysts to catalyze the curing process of UF resin. In order to elucidate the structural variation, 3-methoxy-4-hydroxyphenylpropane as a typical guaiacol lignin structural unit was used as a model compound to observe the hydroxymethylation and the reaction with maleic anhydride analyzed by H-1 and C-13 NMR. After the structural analysis of synthesized lignin-based polyacid by FTIR and C-13 NMR, it was used to produce UF resin as an adhesive in plywood and medium density fiberboard (MDF) production, respectively. The results showed that when the addition of lignin-based polyacid was 5% in plywood, it could effectively improve the water resistance of UF resins as compared to commercial additive NH4Cl. It also exhibited a lower formaldehyde emission. Like plywood, lignin-based catalysts used in medium density fiberboard production could not only maintain the mechanical properties, but also inhibit the water adsorption of fiberboards.