氧等离子体处理对涤纶织物数码转移印花的作用

Effect of Oxygen Plasma Processing on Digital Transfer Printing of Polyester Fabric

为了研究低温等离子体处理对涤纶织物数码转移印花的影响,采用扫描电子显微镜(SEM)观察,发现了经等离子体处理的涤纶纤维表面被明显刻蚀,使纤维表面产生大量的细微凹孔;通过X-光电子能谱(XPS)分析,揭示了经等离子体处理的涤纶纤维表面含氧化学基团有所增加;同时,接触角测试表明等离子体处理的涤纶织物润湿性有了明显的提升。显然,氧等离子体中高能粒子的撞击导致涤纶纤维表面大分子链发生部分降解,表现为处理后涤纶纤维表面粗糙度的提高,使得纤维比表面积提高,增加了热转移印花中分散染料在纤维表面的富集和染着,而纤维表面粗糙度的增加也改变了纤维表面的光反射特征,进而又促进了涤纶织物转移印花得色率的提高。热重分析(TG)表明等离子体对涤纶织物造成的损伤非常小,甚至低于热转移过程本身造成对纤维的损伤。所以,等离子体处理可以作为涤纶织物数码转移印花的前处理,以减少分散染料墨水的消耗。

Scanning electron microscope(SEM)was adopted for studying the effect of low temperature plasma processing on digital transfer printing of polyester fabric.It was found that the surface of polyester fiber processed by plasma had been obviously etched,so that a large number of micro concave holes were produced on fiber surface.XPS analysis revealed that the chemical oxygen-containing polar group increased on the surface of polyester fiber processed by plasma.Water contact angle test showed that the wettability of polyester fabric processed by plasma had been increased significantly.Obviously,partial degradation of macromolecular chain on polyester fiber surface was caused by impact of high-energy particles in oxygen plasma,which is reflected by increase of surface roughness of processed polyester fiber.The increase of surface roughness increased the specific surface area of fiber,and enhanced gathering and saddening of disperse dyes on fiber surface in thermal transfer printing.Besides,the increase of surface roughness of fiber also had changed the light reflection characteristics of fiber surface,and promoted increase in color yield rate in transfer printing of polyester fabric.TG analysis showed that there was little damage on polyester fabric caused by plasma,which is less than that caused by transfer printing.Therefore,plasma processing can be used for pre-treatment of polyester fabric digital transfer printing to reduce the consumption of disperses dye ink.