共查询到20条相似文献,搜索用时 78 毫秒
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介绍了纳米二氧化硅的表面结构特点,简述了纳米二氧化硅作为无机稠化剂的特点及其研究现状,综述了表面改性前后的纳米二氧化硅作为减磨添加剂的研究进展,分析了纳米二氧化硅的润滑减磨作用机理。 相似文献
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《国际聚合物材料杂志》2012,61(10):761-771
Among the various additives employed in modern engine oils, one of the most important is the type that acts to prevent an accumulation of sludge in the crankcase and on the cylinder walls, thereby preventing sticking of piston rings and the formation of varnish-like coatings on the pistons and cylinder walls. Because of their general function of maintaining a clean engine, additives of this nature are termed detergents although it is now understood that they have little utility in cleaning a dirty engine, but by virtue of dispersing activity, prevent engine fouling. A main source of deposits is the oxidation of oil in high temperature, which can be reduced by using antioxidants. This work was limited to the preparation and characterization of different types of polyethylene glycol palmitate with different molecular weights and amination of the prepared esters with tetraethylenepentamine. The efficiency of the prepared compounds as detergents/dispersants and antioxidants was investigated and the effect of the prepared additives on other properties of lube oil was also studied. It was found that all the prepared compounds act as detergents/dispersants and antioxidant additives with no effect on the viscosity index and pour point of the lube oil. 相似文献
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《国际聚合物材料杂志》2012,61(2):114-124
With increasing demands being placed on lubricants for automotive engines and transmissions, it has been necessary to work to improve the function of these lubricants. Modern lubricants are formulated from a range of base fluids and chemical additives to enhance their actions or to add new properties. In this study we have confined ourselves to the study of the detergent/dispersant type of additives based on preparation of polyisobutylene succinic anhydride (PIBSA) and then the reaction of PIBSA with different polyethylene glycols and the amination of the products by different polyamines. The compositions of the prepared compounds were determined by molecular weight, I.R. and H-NMR spectroscopy. The efficiency of the prepared compounds as antioxidants and detergents/dispersants was investigated. It was found that the prepared compounds have very good dispersancy power and the efficiency increases by increasing the number of –NH groups in the prepared compounds and by increasing the molecular weight of the polyethylene glycols. 相似文献
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综述了当前我国润滑油的生产与供应情况及成品润滑油的市场消费情况,分析了国内润滑油行业的近期变化以及产品标准、结构和质量等发展趋势。 相似文献
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减摩抗磨类润滑油添加剂能提高基础润滑油的摩擦学性能使其在润滑领域具有广阔的应用前景,但是商用润滑油添加剂大多含有P、S等有害元素,因此,寻找更加环保、经济的润滑油添加剂具有重要意义。本文根据润滑油添加剂结构种类和润滑机理的不同,以及国内外各种润滑油添加剂在润滑方面的相关成果,综述了近年来纳米颗粒(纳米单质及其复合颗粒、纳米氧化物、纳米硫化物、纳米氮化物)、含氮杂环化合物及其衍生物、硼酸酯及其衍生物、离子液体等添加剂的合成方法以及在减摩抗磨方面的应用,并对其发展状况和减摩抗磨机理进行了探究。指出了其润滑机理主要为吸附膜机理、摩擦反应膜机理和滚珠机理。最后对其存在的问题进行分析,提出了当前润滑领域研究的热点和方向依然是复合添加剂的制备和机理探究。 相似文献
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随着汽车、机械等工业的发展,润滑油与社会普遍需求的关系越来越紧密,市场对润滑油的技术和质量等级要求也越来越高。中国加入WTO后,国内的润滑油市场面临着越来越激烈的竞争。现从我国汽车市场的现状与发展动向入手,分析我国润滑油市场的现状、存在的问题和发展前景,并对国内润滑油生产、质量、营销等提出建议。 相似文献
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祖德光 《精细与专用化学品》2000,8(16):3-5,7
当前,我国润滑油产品供大于求,而质量与国外同类产品则有较大差距。造成上述问题的根本原因是优质润滑油基础油的品种与数量不能完全满足高档润滑油产品开发的需要。因此,应提高高粘度指数(HVI)基础油的比例,并选用溶剂精制与加氢处理相结合的方法由中间基原油生产HVI基础油。 相似文献
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