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以肇实(芡实)为原料,制取肇实淀粉,采用曲线回归法探讨了淀粉乳浓度、H2O2浓度、反应温度、反应时间和pH值对肇实淀粉白度的影响,并用正交试验确定了肇实淀粉漂白的最佳工艺条件。结果表明,最佳漂白工艺条件为:液固比5:1、H2O2浓度3.0%、反应温度45℃、反应时间2h和pH值3.0。 相似文献
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氧化法制备低粘度辛烯基琥珀酸淀粉酯的研究 总被引:1,自引:0,他引:1
对蜡质大米淀粉先采用次氯酸钠氧化,降低粘度的同时在淀粉分子上引入了亲水基团,再采用辛烯基琥珀酸酐进行酯化来制备低粘度辛烯基琥珀酸淀粉酯,结果显示,次氯酸钠的添加量为5%,氧化温度为35℃,对蜡质大米淀粉先氧化12h,再在pH为8.6的条件下,添加3%的辛烯基琥珀酸酐进行酯化,可制得粘度为42cp,取代度为0.02的氧化型低粘度辛烯基琥珀酸淀粉酯,次氯酸钠的漂白作用使产品的白度增加,氧化过程中亲水基团的接入使产品的透明度、稳定性均高于先酸化再酯化以及先酶解再酯化的同类产品,用此方法生产低粘度辛烯基琥珀酸淀粉酯解决了采用传统方法降低粘度生产的该类产品稳定性差,白度低,淀粉易老化的缺陷,大大提高了产品特性. 相似文献
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以肇实(芡实)为原料,制取肇实淀粉,采用曲线回归法探讨了淀粉乳浓度、H2O2浓度、反应温度、反应时间和pH值对肇实淀粉白度的影响,并用正交试验确定了肇实淀粉漂白的最佳工艺条件。结果表明,最佳漂白工艺条件为:液固比5∶1、H2O2浓度3·0%、反应温度45℃、反应时间2h和pH值3·0。 相似文献
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以肇实(芡实)为原料,提取肇实淀粉,采用曲线回归法探讨了淀粉乳浓度、H2O2浓度、反应温度、反应时间和pH值对肇实淀粉白度的影响,并经正交实验确定了肇实淀粉漂白的最佳工艺条件。结果表明,最佳漂白工艺条件为:液固比5:1,3.0%H2O2,反应温度45℃,反应时间2h,pH3.0。 相似文献
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采用正交实验方法研究了以双氧水作为超细马铃薯淀粉漂白剂的漂白工艺,并对影响超细马铃薯淀粉漂白的因素:淀粉乳浓度、氧化剂添加量、时间、温度和pH值等进行了讨论,结果表明:超细化马铃薯淀粉氧化漂白最优工艺参数为淀粉浓度40%、H2O2的添加量为4.0%、反应温度为40℃、漂白时间为50min、料液pH值为6。 相似文献
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研究了稻草高得率浆通过硼氢化钠预处理过氧化氢漂白工艺过程,发现此漂白方法可以适当提高稻草过氧化氢漂白高得率浆白度,为国内稻草漂白高得率浆生产提高了技术支撑。实验得出最佳漂白工艺为:预处理硼氢化钠用药量3%、处理时间2min,漂白过氧化氢用药量8%,氢氧化钠用药量3%,漂白时间60min,漂白温度85℃。在上述工艺条件下漂白得出的浆料白度为49%ISO,比未预处理过氧化氢漂白白度提高了4%。 相似文献
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分别采用双氧水、双氧水/四乙酰乙二胺(TAED)和保险粉对丙烯腈基酪素蛋白复合纤维进行漂白,比较了三种漂白剂漂白后纤维的白度、失重率、酸性染料可染性、化学和结晶结构。研究表明,采用保险粉在中性条件下漂白,可改善纤维白度,酪素蛋白没有流失,可染性不受影响;双氧水/TAED漂白,其纤维白度最高,酪素蛋白的流失极低,但可染性受到一定程度的影响;双氧水碱性漂白引起酪素蛋白的大量流失,明显降低了可染性,但纤维因聚丙烯腈变性而泛黄。三种漂白方法均未改变纤维的主体结晶结构。 相似文献
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氧漂稳定剂CGAD的应用 总被引:4,自引:0,他引:4
非硅型氧漂稳定剂CGAD是含有聚羧酸、羟基和氨基等多种极性基团的高分子络合型化合物,能耐强碱和高温,适用于常规的双氧水漂白工艺、冷轧堆和碱氧一浴法。分析了氧漂稳定剂CGAD对双氧水稳定性能,并测定了纯棉卡其的氧漂大生产工艺。试验结果表明,氧漂稳定剂CGAD与硅酸钠同浴使用,织物手感柔软,白度纯正。 相似文献
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Moothandassery S. Sajeev Subramoni N. Moorthy Ramasami Kailappan Vijayalekshmi Sunitha Rani 《Starch - St?rke》2003,55(5):213-221
Addition of chemicals during the extraction of cassava starch for enhancing the settling rate, whiteness and compactness of the settled starch is an accepted commercial practice. The effect of addition of selected chemicals such as acids (sulphuric and hydrochloric acids), bleaching and oxidising agents (sodium metabisulphite and sodium hypochlorite) and alum during settling on the thermal and pasting properties of the cassava starch was examined. Treatment with sulphuric acid produced a noticeable increase in all DSC gelatinisation parameters, viz. onset gelatinisation temperature (To), temperature at peak minimum (Tp) and end temperature (Te), with increasing concentration of acid, while only a marginal shift could be obtained even at higher concentration of hydrochloric acid. However, no major effect resulted from treatment with sodium metabisulphite, sodium hypochlorite and alum. The gelatinisation enthalpy was hardly affected by the treatments. An exception was hydrochloric acid, which brought about a perceptible decrease in enthalpy at higher concentrations indicating that starch crystallinity is influenced to a small extent by hydrochloric acid. Pasting characteristics studied using a Rapid Visco Analyser showed that sulphuric acid, even at the lowest concentration (5 mM), considerably affected the structural characteristics of cassava starch, while hydrochloric acid induced similar effect only at higher concentrations. Alum reduced the paste viscosity while the bleaching agents (sodium metabisulphite and sodium hypochlorite) were not so effective in modifying the starch viscosity characteristics. 相似文献
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探讨在双氧水漂液中加入适量鸡毛蛋白助剂,减少硅酸钠用量,进一步提高棉织物的白度、毛效及断裂强度.将单独硅酸钠、单独鸡毛蛋白助剂及其联合使用对双氧水漂白棉织物白度、毛效及断裂强度的影响,优化复配助荆的漂白工艺条件,评价鸡毛蛋白助剂在双氧水漂白棉织物中的应用效果.结果表明,蛋白助剂有利于改善双氧水漂白效果. 相似文献
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对合成的非硅氧漂稳定剂168的性能和在棉氧漂工艺中的应用进行了分析,并与硅酸钠比较确定出最佳工艺条件。试验结果表明,168耐强碱,耐高温,对纤维损伤小,处理的棉织物白度高,手感好。 相似文献
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Hongxian Zeng 《纺织学会志》2013,104(8):807-813
A novel activator sodium 4-(2-decanoyloxyethoxycarbonyloxy) benzene sulfonate, whose chemical structure is similar to that of the widely studied activator nonanoyloxybenzene sulfonate was found to be effective for the peroxide bleaching of raw cotton fabrics at low temperatures. The variables affecting bleaching effects were discussed. Temperature showed the greatest impact on the activated bleaching and raising temperature was accompanied with a substantial increase in whiteness. The bleaching performance of the activation system was compared with that of conventional peroxide bleaching. The results indicated that the activated bleaching could provide cotton fabrics with competitive whiteness, wettability, and dyeability. Thus, the novel activating system can be applied to the low-temperature bleaching of cellulosic fibers with a great benefit of energy saving. 相似文献