Application and Properties of Modified Wool Keratin Composites as Film-forming Agent for Leather Finishing

摘要

A series of wool keratin/hydroxymethyl cellulose sodium (CMCNa)/glyoxal composite membranes were prepared via solution blending and cross linking modification technology. The optimization of composite films preparation was critically investigated via orthogonal experimental design. Experimental results indicated that the cross-linking agent had a greater effect on the mechanical properties of films. Under the optimal condition (keratin/CMCNa weight ratio: 5.5, 0.3% glyoxal, reaction time: 1 h， reaction temperature: 37℃), the composite membrane showed good tensile strength and maximum elongation, which can be used as film-forming agent in leather finishing. Moreover, in contrast to casein, the application properties of the leather finished by modified keratin composite film were measured: tensile strength increased by 11.3%, elongation at break improved by 25.7% as well as water vapour permeability by 3.76 %, and wet rub resistance fastness improved from 3 to 4. However, air permeability decreased by 15.1%. SEM and FTIR analysis verified that it has good compatibility, strong hydrogen bonds and covalent bonds formed between cross-linking agent and raw material molecules. The product might be great potential for application in leather finishing as film-forming agent instead of casein.%通过溶液共混和交联改性技术制备羊毛角蛋白/羟甲基纤维素钠/乙二醛复合膜材料，设计正交试验确定最佳制备条件，结果表明交联剂对复合膜的力学性能影响最大，在最佳条件下(角蛋白/羟甲基纤维素钠质量比: 5:5，乙二醛浓度0.3%，反应时间: 1小时，反应温度: 37℃)制备的复合膜具有较好的拉伸强度和最大伸长率，可在皮革涂饰方面甩做成膜剂材料。此外，检测改性角蛋白复合膜涂饰过的皮革样品，其应用性能相比于酪素，拉伸强度提高11.3%，断裂伸长率提高25.7%，透水汽性增长3.76%，耐湿擦等级由3提升至4，，但透气性下降了15.1%。电镜和红外分析表明交联剂与原料分子间形成强烈的氢键、共价键和良好的相容性。此产品作为成膜剂可替代酪素应用于皮革涂饰领域。