木质素基超疏水涂层的制备与表征

Preparation and Characterization of Lignin-based Superhydrophobic Coatings

利用油酸对玉米秸秆纤维素乙醇残渣木质素进行疏水改性后,配制成喷涂液喷涂于基材表面获得木质素基超疏水涂层。采用红外光谱、扫描电镜、接触角测试等分析方法对木质素基超疏水涂层进行表征。结果表明,木质素基超疏水涂层表面形貌与荷叶相似,由葡萄串状微纳米结构组成。木质素基超疏水涂层在抗酸碱腐蚀实验中表现出良好的耐酸碱性;在酸性或碱性溶液中,木质素基超疏水涂层的表面接触角始终都稳定在约153°。同时,该涂层对不同黏稠度的流体食品均有良好的抗粘附能力,相对于在普通塑料杯中,蜂蜜在该涂层表面的残留量降低了93.5%。因此,实验制得的木质素基超疏水涂层应用在食品包装容器内壁,可有效防止流体食物在包装上的残留,减少浪费。

In this paper,cellulose ethanol residue lignin was selected as the substrate for preparation of superhydrophobic coatings,and the lignin surface was hydrophobically modified by oleoyl chloride,then the obtained oleic acid modified lignin was dissolved and sprayed on the substrate surface to obtain the lignin-based superhydrophobic coatings.The lignin-based superhydrophobic coatings were characterized by infrared spectroscopy,scanning electron microscopy,contact angle test.The results showed that the surface morphology of the lignin-based superhydrophobic coatings was similar to that of lotus leaf,and it was composed of grape string-like micro-nanostructure.Lignin-based superhydrophobic coatings showed good acid/alkali resistance in acid/alkali corrosion test.The contact angle of lignin-based superhydrophobic coa-tings was always stable at about 153 degrees in acid or alkaline solution.At the same time,the coatings had good anti-adhesion ability for liquid foods with different viscosities.The residue of honey in lignin-based superhydrophobic coated PP cup decreased by 93.5%,compared to that in noncoated PP cup.Therefore,the lignin-based superhydrophobic coatings could effectively prevent the residue of liquid food and reduce waste when applying on the inner wall of the food packaging containers.