【作者】 尹俊；

【导师】 阎克路；

【作者基本信息】 东华大学 ， 纺织化学与染整工程， 2007， 硕士

【摘要】 黄原胶是一种以碳水化合物为主要原料(如玉米淀粉)、经发酵工程生产的一种微生物多糖，主要用于食品、医药、石油和日用品等领域，具有重大商业价值。分散染料直接印花在印花织物中占的比例很高，是目前主要印花手段之一，直接印花用的糊料主要为天然的海藻酸钠类和淀粉类，以及丙烯酸盐类等合成增稠剂。海藻酸钠价格日趋上涨且来源有限，丙烯酸类增稠剂不能实现很好的生物可降解性，变性淀粉浆料脱糊性和手感不良，因此，新型糊料的开发和应用是必要的。随着黄原胶工业的日益成熟，在环保和价格等方面，黄原胶有着巨大的潜力替代生物难以降解的化学糊料丙稀酸类和价格贵且来源受限的海藻酸钠类糊料。黄原胶作为生态型的糊料在织物印花中的应用研究是一个新的探索，这方面的研究刚刚起步，除了几篇工艺性实验论文外，未见其他相关的研究报道。本文首先用黄原胶做糊料，进行了涤纶织物的印花实验，发现黄原胶在一般的印花条件下透网得色率很低，但能提供良好的边缘清晰度。为了研究黄原胶与其他种类糊料的协效性，将其与海藻酸钠、丙烯酸类增稠剂，羧甲基淀粉、聚马来酸类增稠剂按照一定比例进行了复配。实验发现，复合糊料的透网性比单纯的黄原胶糊料有所提高，而黄原胶对海藻酸钠等近牛顿流体糊料，增粘作用明显，对丙稀酸类假塑性糊料，增粘作用不显著。但复配的效果都不能满足优良印花各方面性能的要求，尤其在印花透网得色率方面。为了探索黄原胶印花性能不良的原因，本文对黄原胶的流变性能进行了研究。分别考察了其粘度、印花粘度指数、流变曲线、粘弹性、蠕变和回复性能。结果表明，黄原胶具有良好的增稠作用，较大屈服应力；明显的剪切变稀性。要将其作为印花糊料，既要利用其剪切变稀的特性，又要尽量降低其屈服应力。在了解了黄原胶的独特的流变性能之后，本文初步探讨了通过物理化学方法对黄原胶流变性能的改变。实验发现适量的表面活性剂如渗透剂的加入，可以使其的流动性增强，表面张力降低，印花透网性有所提高，但色浆易渗化。进而，本文讨论了通过双氧水氧化的方法对黄原胶进行改性。氧化过的黄原胶粘度有所降低，流动性得到改善，印花透网得色量得到一定提高，而且抗渗化性未受影响。但与传统的印花糊料性能相比，其得色量仍存在一定差距，达不到实际应用的要求。本论文的研究结果对开发印花新型糊料黄原胶，有重要的理论意义和参考价值。更多还原

【Abstract】 Xanthan gum is a polysaccharide produced by a biotechnological fermentation process based on corn starch. Nowadays, Xanthan has been bulk produced in European countries and used mainly in the fields of food munufactory, medicine manufactory, petroleum drilling, and other consumer goods industry. It has huge commercial potential.Disperse dyestuff printed polyester fabric is one of the most popular part in the whole printing family. Alginate, starch and acrylic thickeners are common used as printing paste in industry. But for Alginate, the price of raw material is increasing every year and also the source is limited; for synthetic thickeners, they don’t have good biodegradation property. And for the starch thickener, they are not easy to be removed from the fabric and will affect the hand feeling. So, optimized printing paste is necessary for the textile industry. Xanthan gum, as an ecological thickening material, is a new development in the textile printing industry. It has the potential advantage to replace Alginate or Synthetic thickener which had showed the disadvantage in usage. But now there were only few papers which working on experimental application of Xanthan are founded, this field is still in the very beginning steps.In this paper, first printing experiments were done with Xanthan gum and as well as other traditional printing paste. From the experiment, compared with the other two printing thickeners, Xanthan can not offer satisfied printing ability. The dye-up-take of Xanthan is very low but it can offer good sharpness and good outline. After the mixture experiment, we found that Xanthan can help Newton liquid like Alginate to increase the viscosity remarkably, but for pseudo plastic liquid like Acrylic thickener, it has less contribution.To find the reason of Xanthan’s poor printing ability, a few of rheological factors were measured and discussed. They are viscosity, PVI, flow curve, viscoelasticity, creep and recover. From the experiment, it shows that Xanthan gum is an effective thickener, can offer high viscosity with low concentration. Xanthan gum is a pseudo plastic liquid or shear-thinning material with high yield value, low PVI, strong surface tension.After the research on the rheological property of Xanthan gum, the modification experiment is discussed in both physical and chemical aspects. First, the blends of Xanthan respective with four other thickeners are used in printing paste. From the printing result and the viscosity of the blends, the effects of Xanthan gum to other thickeners are discussed. Xanthan can improve the viscosity of the system in different ways depends on the thickener species. Secondly, different ion types of surface agents are added into Xanthan printing paste. The surface tension and flow behavior are changed with the existence of surface agent. And the penetration ability of Xanthan gum paste into the fabric is also improved. But if the amount of surface agent is too high, the sharpness of out line will be destroyed. At last, the modification of Xanthatn gum is discussed. H₂O₂ was chosen as the oxidation agent for the modification. Because that the reaction process is relative simple and without pollution to the environment. The oxidized Xanthan gum has lower viscosity comparing with the original one at the same concentration. At the same viscosity, the oxidized Xanthan has better flow behavior and improved dye-up-take. Also the oxidized Xanthan gum has more transparent and homogeneous appearance. Without adding ant-moldy agent such as formaldehyde, oxidized Xanthan gum can keep stable for longer time.Although the oxidation can help Xanthan to optimize it’s printing property, the research is still on the base and further more work and research are required to continue.更多还原