Evaluation of detergency for development of the environment-friendly detergent system

去污力评价以开发环保型洗涤剂体系

基本信息

批准号：
14580117
负责人：
GOTOH Keiko
金额：
$ 2.24万
依托单位：
Kyoto University of Education
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

The detergency was evaluated using a model detergent system constructed by the quartz crystal microbalance technique. Polyethylene, nylon or cellulose acetate film was prepared on gold electrodes of the QCM by a spin-coating method. As a model oily contaminant, the Langmuir-Blodgett films of long-fatty acid were deposited onto the QCM. The QCM was ultrasonically cleaned in aqueous solutions and the removal efficiency of long-fatty acid was determined from the frequency change of the QCM. The efficiency was greatest for acetate, followed by nylon, gold and polyethylene. The removal efficiency was found to increase with increasing surfactant or ethanol concentration. In the presence of alkali, the removal efficiency further increased. The removal efficiency had a good correlation with the free energy change due to the penetration of a liquid layer between the long-fatty acid film and the substrate, which was calculated using the contact angles and surface free energies. The QCM was perpendicularly immersed in the aqueous dispersion of polyethylene or nylon particles as a model particulate soil. Apparent equilibrium deposition was large for the polyethylene particle compared with the nylon particle. The deposition drastically decreased by addition of ethanol to the dispersion. The results were discussed on the basis of the extended DLVO theory using the surface free energy components and the electrokinetic potentials. The deposition was found to largely depend on the acid-base interaction.The 172 nm ultraviolet(UV) excimer light was exposed to polyethylene, polypropylene, poly (ethylene terephthalate) and nylon surfaces in ambient air. The wettability increased remarkably by UV treatment of 1 min. The deposition of polyethylene and nylon particles onto the polymer surface was examined in water, water/ethanol mixture, ethanol and n-heptane. A considerable decrease in the deposition due to UV treatment was confirmed in any system.

使用由石英晶体微天平技术构建的模型洗涤剂系统评估去污力。通过旋涂方法在QCM的金电极上制备聚乙烯、尼龙或醋酸纤维素薄膜。作为油性污染物模型，长脂肪酸的 Langmuir-Blodgett 薄膜沉积在 QCM 上。在水溶液中对QCM进行超声波清洗，并根据QCM的频率变化确定长脂肪酸的去除效率。醋酸纤维的效率最高，其次是尼龙、金和聚乙烯。发现去除效率随着表面活性剂或乙醇浓度的增加而增加。在碱存在下，去除效率进一步提高。去除效率与由于长脂肪酸膜和基材之间液体层的渗透而产生的自由能变化具有良好的相关性，这是使用接触角和表面自由能计算的。将 QCM 垂直浸入聚乙烯或尼龙颗粒的水分散体中作为模型颗粒土壤。与尼龙颗粒相比，聚乙烯颗粒的表观平衡沉积较大。通过向分散体中添加乙醇，沉积急剧减少。使用表面自由能分量和动电势在扩展 DLVO 理论的基础上讨论了结果。研究发现，沉积很大程度上取决于酸碱相互作用。将 172 nm 紫外 (UV) 准分子光暴露于环境空气中的聚乙烯、聚丙烯、聚对苯二甲酸乙二醇酯和尼龙表面。经过1分钟的UV处理，润湿性显着增加。在水、水/乙醇混合物、乙醇和正庚烷中检查聚乙烯和尼龙颗粒在聚合物表面上的沉积。在任何系统中都证实，由于紫外线处理，沉积物显着减少。