硬脂酰化木质素基复合涂层在木材超疏水改性中的应用  

Superhydrophobic modification of wood by stearylated lignin composite coating

作　　者：笪森寅 孟浩 樊鑫炎 赵怡杰 王永贵[1] 肖泽芳[1] 王海刚[1] 谢延军[1] DA Senyin;MENG Hao;FAN Xinyan;ZHAO Yijie;WANG Yonggui;XIAO Zefang;WANG Haigang;XIE Yanjun(Key Laboratory of Bio-based Material Science and Technology of Ministry of Education,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学生物质材料科学与技术教育部重点实验室,哈尔滨150040

出　　处：《林业工程学报》2023年第3期91-98,共8页Journal of Forestry Engineering

基　　金：中国博士后科学基金(2019T120247)。

摘　　要：在木材表面构建超疏水涂层能有效隔离木材与水分接触,缓解木材因强吸湿/水能力导致变形、开裂、腐朽等问题,同时赋予改性木材防水、自清洁等新的功能。通过硬脂酰氯对工业脱碱木质素进行酯化反应,合成具有优异疏水性能的硬脂酰化木质素(LSE)。首先,以LSE为主要组分,通过与环氧树脂(ER)、二氧化硅(SiO_(2))和十八烷基三甲氧基硅烷(OTMS)以不同质量比复合在玻璃基材上制备复合超疏水涂层,性能分析结果表明四者质量比为10∶2∶1∶1的LSE/ER/SiO_(2)/OTMS涂层的疏水性能和机械稳定性能最优;随后,采用喷涂的方式在木材表面构筑LSE/ER/SiO_(2)/OTMS超疏水涂层,并用扫描电镜SEM对其微观形貌和表面结构进行表征;最后,通过砂纸磨损实验和胶带剥离实验对超疏水涂层的机械稳定性能进行了测试及评价,并通过霉菌、白腐菌和褐腐菌侵染实验探究了其生物耐久性。结果表明:在木材表面沉积LSE/ER/SiO_(2)/OTMS涂层制备出的超疏水木材横切面和弦切面的接触角分别为(161.4±3.9)°和(159.1±4.0)°,滚动角分别为(7.5±1.2)°和(7.7±1.3)°;超疏水木材表面经过40次砂纸磨损和60次胶带剥离后,超疏水木材仍然保持了超疏水性,表明LSE/ER/SiO_(2)/OTMS超疏水木材具有良好的机械稳定性。此外,超疏水木材表面被白腐菌侵染后失去了疏水性能,但被霉菌和褐腐菌侵染后的表面接触角分别为(152.0±4.0)°和(144.3±6.6)°,LSE复合涂层具有一定的生物耐久性。The construction of superhydrophobic coating on the wood surface can effectively isolate the contact between wood and water,and alleviate the problems of deformation,cracking and decay of wood due to strong moisture absorption/water capacity,providing the modified wood with new functions such as waterproof and self-cleaning.In this study,stearoyl chloride was used to esterify industrial dealkalized lignin,and the reaction product was stearylated lignin(LSE)with excellent hydrophobic properties.Firstly,the composite superhydrophobic coating was prepared on the glass substrate by adding different proportions of the epoxy resin(ER),silicon dioxide(SiO_(2))and octadecyltrimethoxysilane(OTMS)with LSE as the main component.The results of performance analysis showed that the LSE/ER/SiO_(2)/OTMS coating with a mass ratio of 10∶2∶1∶1 had the best hydrophobic properties and mechanical stability.Subsequently,the LSE/ER/SiO_(2)/OTMS superhydrophobic coating was constructed on the wood surface by spraying.The microstructure and surface structure were characterized by the scanning electron microscope(SEM).The mecha-nical stability of the superhydrophobic coating was tested and evaluated by the abrasion test and tape peeling experiment.The Biological durability was studied through the infection experiments of mold,white rot fungi and brown rot fungi.The results showed that the contact angles of the cross section and tangential section of the superhydrophobic wood prepared by depositing LSE/ER/SiO_(2)/OTMS through coating on the wood surface were(161.4±3.9)°,(159.1±4.0)°,and the rolling angles were(7.5±1.2)°and(7.7±1.3)°,respectively.After 40 times of sandpaper abrasion and 60 times of tape-peeling,the superhydrophobic wood still retained superhydrophobic property,indicating that the LSE/ER/SiO_(2)/OTMS superhydrophobic wood had good mechanical stability.In addition,the superhydrophobic wood surface lost its hydrophobic property after being infected by white rot fungi,but the surface contact angles after being infe

关 键 词：硬脂酰化木质素 硬脂酰氯 超疏水 木材 生物耐久性 

分 类 号：S781[农业科学—木材科学与技术]