摘要
目的制备环保型木质素基胶黏剂,解决传统石油基木制包装用胶黏剂原料不可再生的问题,探究其胶合性能影响因素。方法以废弃玉米芯提取的酶解木质素为原料,采用环氧氯丙烷进行环氧化改性,并分别选用水杨酸(SA)、天门冬氨酸(AST)和柠檬酸(CA)使其固化交联,通过单因素实验和响应面法(RSM)确定有机酸添加量、热压温度和热压压力对其胶合强度的影响。结果傅里叶变换红外光谱(FT-IR)分析证实了木质素成功实现环氧化修饰,且柠檬酸固化交联的环氧化木质素基胶黏剂表现出最佳的胶合性能。RSM表明当柠檬酸添加量为15.3%、热压温度为175.6℃、热压压力为1.5 MPa时,干胶合强度预测最大值可达1.35 MPa,结果与实测值吻合。结论木质素基胶黏剂的胶合性能受天然有机酸改性影响明显,相较于SA和AST,CA对环氧化木质素表现出最优的交联反应活性,其制备的胶合板胶合性能达到最佳。
The work aims to prepare environmentally friendly lignin-based adhesives,to address the issue of non-renewable raw materials in traditional petroleum-based adhesives used for wooden packaging,and explore the factors affecting on bonding performance.With enzymatically hydrolyzed lignin extracted from waste corn cobs as raw material,epoxidation modification was conducted with epichlorohydrin.Citric acid(CA),aspartic acid(AST),and salicylic acid(SA)were selected for curing and cross-linking,respectively.The effects of organic acid addition,hot-pressing temperature,and hot-pressing pressure on the bonding strength were determined through single-factor experiments and response surface methodology(RSM).The results demonstrated that Fourier transform infrared spectroscopy(FT-IR)analysis confirmed the successful epoxidation modification of lignin,and the epoxidized lignin-based adhesive cured with citric acid exhibited the best adhesive performance.The optimal process parameters obtained through RSM optimization were citric acid addition of 15.3%,hot-pressing temperature of 175.6℃,and hot-pressing pressure of 1.5 MPa.Under these conditions,the predicted maximum dry bonding strength could reach 1.35 MPa,which was consistent with the measured value.The bonding performance of lignin-based adhesives is significantly influenced by modification with natural organic acids.Compared with SA and AST,CA exhibits the best cross-linking reaction activity towards epoxidized lignin,resulting in the best bonding performance of the plywood produced.
作者
张志岩
庄雯蓉
唐松波
樊奇
王逸之
ZHANG Zhiyan;ZHUANG Wenrong;TANG Songbo;FAN Qi;WANG Yizhi(Yunnan Provincial Key Laboratory for Conservation and Utilization of In-forest Resource,Southwest Forestry University,Kunming 650224,China;College of Future Biomass,South China Agricultural University,Guangzhou 510642,China;Key Laboratory for Bio-based Materials and Energy of Ministry of Education,South China Agricultural University,Guangzhou 510642,China;Guangdong Yufeng Industrial(Group)Co.,Ltd.,Guangzhou 510900,China)
出处
《包装工程》
北大核心
2026年第3期28-35,共8页
Packaging Engineering
基金
云南省“兴滇英才支持计划”(XDYC-QNRC-2024-252)
广东省本科高校教学质量与教学改革工程建设项目(2024210)
华南农业大学高等教育教学改革项目(2025072)。
关键词
木质素
环氧化木质素
生物基胶黏剂
有机酸交联
胶合性能
lignin
epoxidized lignin
bio-based adhesives
organic acid cross-linking
gluing properties
