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研究采用湿法双醚化和氧化降解制备的季铵型羧甲基两性淀粉浆料性能。试验制备了季铵型羧甲基两性淀粉,测试了不同黏度、取代度、pH值条件下两性淀粉的浆液及浆膜性能,并比较了阳离子淀粉、羧甲基淀粉和两性淀粉的浆膜性能以及对纯棉纱和涤棉纱黏附性。结果表明:两性淀粉具有高浓低黏浆料特征,其黏度热稳定性和成膜性良好;随着黏度下降,浆膜断裂强度及断裂伸长率降低;随着阴、阳离子取代度的增加,浆料黏度热稳定性逐步提高,阳离子取代度在0.02~0.03、阴离子取代度在0.03~0.04范围内的两性淀粉浆膜性能较理想;pH值在中性条件下,浆膜断裂强度较好;两性淀粉的浆膜性能均优于阳离子淀粉及羧甲基淀粉;两性淀粉浆料对棉纱、涤棉纱的黏附性能优于其他变性淀粉浆料。认为:季铵型羧甲基两性淀粉能够满足纯棉纱和涤棉纱的上浆要求。 相似文献
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当前,行业迫切需要开发一种性能优异、价格低廉、绿色环保的浆料,以满足浆纱的需求。文章针对阳离子淀粉-海藻酸钠协同作用对提高纯棉经纱浆纱性能进行了分析研究,为该复合浆料体系的实际生产应用提供了理论依据。文章通过大量实验,确定阳离子淀粉与海藻酸钠适宜经纱上浆的配比,并对阳离子淀粉-海藻酸钠复合浆料的浆液、浆膜、浆纱质量等各项性能指标进行了系统测试。结果表明,聚丙烯酸用量占10%且阳离子淀粉∶海藻酸钠为8∶2时,阳离子淀粉-海藻酸钠复合浆料浆纱性能达到最佳,满足上浆要求。 相似文献
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对不同取代度的阳离子淀粉的糊化温度、粘度、粘着力、耐磨性能和浆膜吸湿性能等指标进行了测试分析,得出了取代度变化对浆料性能的影响规律,并指出:由酸解淀粉制取的阳离子淀粉对纯棉纱的粘着力大于由玉米原淀粉制取的阳离子淀粉;阳离子淀粉的取代度控制在0.05左右为宜. 相似文献
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为了解决淀粉中低温水不溶的问题,根据中低温浆纱工艺对浆料水溶性、黏度、成膜性及对纺织纤维粘附性能的要求,采用酸解、季铵阳离子化和乙醇-碱法对淀粉进行改性,合成了一种中低温水可溶季铵阳离子淀粉浆料。采用扫描电了显微镜、红外光谱、电泳仪分析了所制得浆料的微观结构。研究了乙醇-碱法制备中低温水可溶淀粉时,反应温度、反应时间、乙醇用量、水含量、碱量对该淀粉浆料溶解性能的影响,测试了该淀粉浆料的浆液、浆膜性能。结果表明,反应温度为60℃,反应时间为50min,淀粉、水、乙醇和碱的量比为1:20:8:0.4时,所制得的淀粉浆料可溶于室温水中,浆液具有良好的黏度和抗凝沉性。 相似文献
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本文主要对阳离子淀粉/胶体二氧化硅二元助留体系的应用进行了研究。初步研究了阳离子淀粉的用量,胶体二氧化硅的用量,阳离子淀粉、胶体二氧化硅与浆料的接触混合时间、pH值以及实验用水硬度对阳离子淀粉/胶体二氧化硅体系应用效果的影响。通过对浆料留着率的测定,寻找阳离子淀粉/胶体二氧化硅微粒助留体系应用的最佳条件,确定了方案的优化条件,研究表明:在此实验中,阳离子淀粉用量为1%,胶体二氧化硅用量为0.2%,阳离子淀粉、胶体二氧化硅与浆料接触时间分别为60s和30s,混合浆料的pH值为9,实验室用水的Ca2+含量为200mg/L时的浆料留着率达到最大。 相似文献
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壳聚糖对红麻纸张表面性能的影响 总被引:3,自引:2,他引:1
研究了壳聚糖、阳离子淀粉和聚乙烯醇(PVA)分别作为施胶剂对增强红麻纸张表面性能的影响。结果表明:浆料纤维经过打浆处理后加入壳聚糖,纸页表面性能明显提高,增强效果优于阳离子淀粉和PVA;在施胶质量方面,阳离子淀粉与壳聚糖的效果相当,但是,相同浓度下,阳离子淀粉有利于降低纸页的吸水能力;在其他性能上,特别是印刷纸的表面平滑度,壳聚糖要优于阳离子淀粉和PVA。 相似文献
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摘要:采用不同投料比,制备一系列具有不同取代度的马来酸酐酯变性淀粉,测试其浆液黏度、浆膜及黏附性,以明确马来酸酐酯化变性对淀粉浆料性能的影响。通过与酸解淀粉及醋酸酯淀粉的比较,评价了马来酸酐酯化淀粉的上浆性能。结果表明:马来酸酯化变性能够有效增加淀粉浆膜的断裂伸长和断裂功,提高对涤纶及棉纤维的黏附性,改善退浆性。当变性程度相近时,马来酸酐酯化淀粉浆料的性能优于醋酸酯淀粉。从黏附力、浆膜性能、反应效率等方面判断,马来酸酐酯化淀粉的取代度以0.036为宜;制备方法是:首先应采用适当的方式对淀粉原料降黏,然后将淀粉质量25%的马来酸酐缓慢加入到淀粉水分散液中,控制反应体系的pH7.5~8.5,最后在30℃下搅拌反应1h。 相似文献
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为探究超细纤维非织造材料孔径的可预测性,通过水刺原纤化技术制备了聚酯(PET)/聚酰胺6(PA6)双组分中空橘瓣型超细纤维非织造材料,在纤维几何形态和材料结构特征研究的基础上构建了孔径预测模型,并对孔径大小与开纤率、纤维线密度的关系进行了理论预测。结果表明:双组分纤维在水刺作用下开裂成超细纤维,且纤维在水平方向相互纠缠排列;受水刺原纤化工艺影响的开纤率是影响孔径分布的主要因素;孔径预测模型的理论值与实验值的对比结果表明孔径预测模型可以用来预测PET/PA6 双组分中空橘瓣型超细纤维非织造材料的孔径分布。 相似文献
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Yanan Guo Bailiang Li Tianfu Cheng Zhaodong Hu Shuangqi Liu Jun Liu Fuwei Sun Zengwang Guo Zhongjiang Wang 《International Journal of Food Science & Technology》2023,58(1):343-354
The objective of this study was to investigate the effects of cavitation jets on the structural, emulsifying and rheological properties of soybean protein oxidation aggregates. The results showed that oxidation might induce the formation of larger particle sizes and molecular weight protein aggregates and the decrease of emulsifying properties. The cavitation jet at a short treatment time (<6 min) broke down the disulphide bonds and protein skeleton structures, which reduced the aggregate sizes and molecular weights and increased the emulsion activities, emulsion stabilities, apparent viscosity and elastic modulus. The cavitation jet at a long treatment time (>6 min) supported disulphide bond formation among molecules by intermolecular interactions to form protein aggregates. In addition, the skeleton structure showed cross-linking aggregation. This increased the particle sizes and molecular weights and reduced the emulsion properties, consistency index K and elastic modulus. The findings showed that a cavitation jet at 6 min on oxidised aggregates of soybean protein might enhance the structural, emulsifying and rheological characteristics for the industry. 相似文献
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ACOUSTIC EMISSION, FRACTURE BEHAVIOR AND MORPHOLOGY OF DRY CRISPY FOODS: A DISCUSSION ARTICLE 总被引:1,自引:1,他引:0
This article describes sound properties that are special for crispy foods and relates them to general knowledge on the acoustic emission and mechanical properties of fracturing materials. From properties like the occurrence of sound, the sound energy, the duration of single sound waves, the time interval between the sound pulses and from the force drops involved, it was possible to calculate the morphological constraints for dry, crispy cellular foods. We present data for the minimum and maximum sizes of the pores and of the sizes of the solid material element surrounding them. The loss of crispness in foods caused by aging under deteriorating circumstances was found not to be caused by changes in the type of elements that fracture. 相似文献
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The physicochemical properties of high amylose rice flour prepared from wet milling and dry milling were examined and the rice vermicelli quality made from these flour samples was evaluated. The effect of flour particle size on rice vermicelli quality was also determined. The milling method affected chemical compositions and all physicochemical properties of the flour. A higher degree of starch damage occurred in drymilled flour. Rice vermicelli made from dry‐milled flour had higher cooking losses and softer texture than that made from wet‐milled flour and the commercial reference products. Flour particle size influenced both cooking and textural quality of rice vermicelli but did not influence the water absorption index. Flours with larger particle sizes gave vermicelli with higher cooking loss and less desirable texture than flours with smaller particle sizes. Flour with particle sizes less than 200 mesh produced acceptable vermicelli in terms of cooking and textural quality. 相似文献