Preparation and Application of an Amphiphilic Acrylic Copolymer as a Retanning Agent

摘要

以丙烯酸十二醇酯和丙烯酸为原料，通过乳液聚合技术制备了一种两亲型丙烯酸聚合物复鞣剂。利用傅里叶红外光谱(FTIR)对产物的结构进行了确认和表征，利用激光光散射仪(DLS)对产物的粒径及其分布进行了测定。通过测定复鞣前后坯革的抗张强度、撕裂强度、断裂伸长率以及增厚率等物理机械'性能指标，研究了该两亲聚合物复鞣剂组成与其应用性能的关系。利用扫描电子显微镜(SEM)、宽角X衍射仪(XRD)以及动态粘弹谱仪(DMA)硏究了该两亲聚合物复鞣剂的作用机理。结果表明，所制备的两亲聚合物复鞣剂能够显著改善坯革的物理机械性能。该产品的复鞣、填充能力随着聚合物结构中丙烯酸单元含量的增加而增加，聚合物结构中的长链烷基酯可以起到润滑胶原纤维的作用，并改善复鞣革的机械强度，特别是攧裂强度。当丙烯酸十二醇酯与丙烯酸的质量百分比为30:70时，产物的综合性能最好。经该聚合物复鞣后，坯革胶原纤维得到有效分散，纤维的结晶度下降，坯革的弹个生以及耐热稳定性也得到提高。%An amphiphilic acrylic copolymer of lauryl acrylate and acrylic acid has been synthesized to be used as a retanning agent for chromed-tanned leather. The structure of the resulting product is characterized by Fourier infrared spectroscopy (FT-IR), and particle size is measured with a dynamic light scattering instrument (DLS). Tfie correlation between the co-monomers ratio of the prepared copolymer and its application properties has been investigated by measuring such physical/mechanicat indexes of the retanned leather as thickness increment ratio, tensile strength, elongation at break and tear strength. The retanning mechanism of the polymeric syntan is also explored by scanning electron microscopy (SEM)， X-ray diffraction (XRD) and dynamic mechanical analysis (DMA). It has been found that the performance of the product is strongly affected by the composition of the amphiphilic polymer. The leather retanned by the amphiphilic polymeric syntan achieves an improvement of mechanical properties, as well as enhancement of thermal stability. The results of instrumental analysis also provide evidence to the applicability of the prepared copolymer as an efficient retanning agent for chrome-tanned leather.