含碳基纳米材料改性聚脲润滑脂

发布时间：2018-06-04 18:18

本文选题：聚脲润滑脂 + 碳基纳米材料　；参考：《广东工业大学》2015年硕士论文

【摘要】：机械设备运转中润滑脂是减少机件轴承磨损和延长机械寿命的重要润滑剂。其中,聚脲润滑脂具有一系列优良性能,如抗腐蚀性能、长的使用寿命和适用性强等特点,是一种潜力巨大和良好发展前景的润滑材料。为了提高聚脲润滑脂性能和拓展其应用,可以在润滑脂中添加合适的添加剂。目前碳基纳米材料在润滑脂中润滑效果研究鲜见报道,以碳基纳米材料作为润滑脂新一代添加剂,拥有广阔的应用前景。为此本文将两种碳基纳米材料添加于聚脲润滑脂中,对碳基纳米材料在润滑脂中的热稳定性能、润滑性能及抗静电性进行了系统研究。本文主要研究内容如下：1.以多壁碳纳米管、石墨烯为添加剂,合成聚脲润滑脂。利用滴点测定仪、热重分析仪和导热系数测定仪研究了聚脲润滑脂的热稳定性能。发现两种碳基材料加入聚脲润滑脂中,对润滑脂的滴点没有明显的影响,但明显提高了润滑脂的热分解温度,其中以多壁碳纳米管为添加剂的润滑脂热稳定性优于以石墨烯润滑脂。导热系数测定表明两种碳基纳米材料均提高了润滑脂的导热系数。2.采用了摩擦磨损试验仪和四球机全面考察了两种碳基纳米材料在润滑脂中高低负载和不同摩擦副下的减摩性能,并观察其磨斑形貌。其中在低负载下两种碳基纳米材料较高的摩擦系数表明不太适合在低负载摩擦下情况使用。在不同聚合物作为摩擦副的测试中,石墨烯的减磨效果优于碳纳米管,平均摩擦系数都比碳纳米管的要低。高负载下两种碳基纳米材料表现出优异的润滑性能,其中可能是因为石墨烯在摩擦过程中吸附在受力的钢球表面,形成物理沉积膜。3.考察了含碳基纳米材料润滑涂层在工业上的应用。采用了表面电阻测试仪考察含碳基纳米材料在润滑涂层的抗静电效果。结果表明均改善了聚脲润滑脂在聚合物材料表面润滑过程的抗静电性能。并且比对了市售润滑脂的润滑性能,结果表明都已达到常用市售润滑脂的润滑性能,并且含石墨烯脲基润滑脂的润滑性能比市售润滑脂更好。
[Abstract]:Grease is an important lubricant to reduce bearing wear and prolong mechanical life. Polyurea grease has a series of excellent properties, such as corrosion resistance, long service life and strong applicability. It is a kind of lubricating material with great potential and good development prospect. In order to improve the performance of polyurea grease and expand its application, suitable additives can be added to the grease. At present, there are few reports on the lubricating effect of carbon based nano-materials in lubricating greases. Carbon based nano-materials as a new generation of grease additives have a broad application prospect. In this paper, two kinds of carbon based nano-materials were added to polyurea grease. The thermal stability, lubricating property and antistatic property of carbon based nano-materials in grease were studied systematically. The main contents of this paper are as follows: 1. Polyurea grease was synthesized with multi-wall carbon nanotubes and graphene as additives. The thermal stability of polyurea grease was studied by using drop point tester, thermogravimetric analyzer and thermal conductivity tester. It was found that the addition of two kinds of carbon based materials into polyurea grease had no obvious effect on the dropping point of grease, but significantly increased the thermal decomposition temperature of grease. The thermal stability of lubricating grease with multi-wall carbon nanotubes as additive is better than that with graphene grease. The measurement of thermal conductivity shows that the thermal conductivity of lubricating greases is increased by two kinds of carbon based nano-materials. Friction and wear tester and four-ball machine were used to investigate the antifriction properties of two kinds of carbon based nano-materials under high and low loads in grease and different friction pairs, and the morphology of wear spot was observed. The high friction coefficient of the two carbon based nanomaterials under low load shows that they are not suitable for use under low load friction. In the test of different polymers as friction pairs, the wear reduction effect of graphene is better than that of carbon nanotubes, and the average friction coefficient of graphene is lower than that of carbon nanotubes. The two carbon based nanomaterials exhibit excellent lubricating properties under high load, which may be due to the adsorption of graphene on the surface of the steel ball during friction and the formation of a physical deposition film .3. The industrial application of lubricating coatings of carbon-containing nano-materials was investigated. The antistatic effect of carbon-based nano-materials on lubricating coatings was investigated by surface resistance tester. The results show that the antistatic properties of polyurea grease on the surface of polymer are improved. The results show that the lubricating properties of commercial greases containing graphene urease grease are better than that of commercial greases.
【学位授予单位】：广东工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE624.83;TB383.1

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