详细信息
环氧化木质素增强三聚氰胺-尿素-甲醛共缩聚树脂研究
Investigation on the Epoxidized Lignin for Reinforcing Melamine-Urea-Formaldehyde Co-condensation Resins
文献类型:期刊文献
中文题名:环氧化木质素增强三聚氰胺-尿素-甲醛共缩聚树脂研究
英文题名:Investigation on the Epoxidized Lignin for Reinforcing Melamine-Urea-Formaldehyde Co-condensation Resins
作者:高士帅[1] 谢宜彤[1] 陈秀兰[2] 王春鹏[1] 储富祥[1] 张代晖[1]
第一作者:高士帅
机构:[1]中国林业科学研究院林产化学工业研究所、江苏省生物质能源与材料重点实验室、国家林业和草原局林产化学工程重点实验室、林木生物质低碳高效利用国家工程研究中心、江苏省林业资源高效加工利用协同创新中心,江苏南京210042;[2]大亚人造板集团有限公司,江苏镇江201600
年份:2023
卷号:43
期号:6
起止页码:51-56
中文期刊名:林产化学与工业
外文期刊名:Chemistry and Industry of Forest Products
收录:CSTPCD;;Scopus;北大核心:【北大核心2020】;CSCD:【CSCD2023_2024】;
基金:中国林科院中央级公益性科研院所基本科研业务费专项资金(CAFYBB2021ZI001)。
语种:中文
中文关键词:木质素;环氧化;脲醛树脂;胶合板
外文关键词:lignin;epoxidation;urea-formaldehyde(UF)resin;plywood
分类号:TQ35
摘要:利用环氧氯丙烷与木质素分子中的羟基和羧基环氧化反应制备环氧化木质素(EL),并将EL用作三聚氰胺-尿素-甲醛共缩聚树脂(MUF)的无醛交联剂,提高树脂胶合强度,同时EL与MUF树脂中的游离甲醛反应,有助于降低树脂的甲醛释放量。采用红外光谱和化学滴定法分析发现:随着木质素与环氧氯丙烷开环反应温度升高,EL环氧基团含量呈先增多后减少的趋势,开环温度100℃时制得的EL(EL-100)环氧指数达到最高为2.6 mol/kg。与未添加EL的MUF树脂相比,添加5%EL-100的MUF树脂固化后的弹性模量(5.94 MPa)提高了117%,胶合强度(1.11 MPa)提高了33.7%,甲醛释放量(0.206 mg/L)降低了27.0%。
Epoxidized lignin(EL)was prepared by epoxidation of epichlorohydrin with the hydroxyl and carboxyl groups in lignin molecules.EL was used as a formaldehyde-free cross-linking agent for melamine-urea-formaldehyde(MUF)co-condensation resins to improve the bonding strength of MUF resin,and the reaction between EL and free formaldehyde in the MUF resin decreased the formaldehyde emissions of resin.With the increase of ring-opening reaction temperature between lignin and epichlorohydrin,the epoxy group content of EL showed a trend of increasing and then decreasing,which was determined by the infrared spectroscopy and chemical titration methods.The EL epoxy index reached the highest value of 2.6 mol/kg at 100℃.Compared with the MUF resin without EL,the modulus of elasticity(5.94 MPa)of added 5%EL-100 MUF resin increased by 117%after curing,and shear strength(1.11 MPa)increased by 33.7%and the formaldehyde emission(0.206 mg/L)decreased by 27.0%.
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