| 超疏水膜用于去除润滑油中的水并恢复润滑性能 | |
| 赵思洋 | |
| Thesis Advisor | 郭志光 ; 咸春雷 |
| 2018-06-01 | |
| Degree Grantor | 中国科学院大学 |
| Place of Conferral | 北京 |
| Degree Name | 工程硕士 |
| Degree Discipline | 材料工程 |
| Keyword | 超疏水 膜 润滑油 添加剂 水 Superhydrophobic Membrane Lubricating oil Additives Water |
| Abstract | 润滑油在实际使用过程中，水经常不可避免地通过各种方式混入润滑油，造成润滑油润滑性能的降低。所以将润滑油中的水去除并使润滑油再利用对于机械运行安全、资源回收和环境保护等方面具有重要的实际意义。近些年来，超疏水材料被广泛地用于油水分离。然而，其表面的微-纳分级结构机械性能不稳固，大大限制了其在实际中的应用。迄今为止，许多工作主要集中在机械破坏对界面材料的超润湿性质的影响。然而，机械破坏对界面材料的应用性能的影响，尤其是对于分离润滑油包水乳液却未曾研究。本论文从水易混入润滑油这一实际问题出发，通过开发多种稳固的超疏水膜，对各种常见润滑油包水乳液进行乳液分离并去除润滑油中的水，使分离后的油恢复与纯油相同的润滑性能并能再利用，并探究水对润滑油润滑性能的影响及含水润滑油的失效机理。主要研究内容和结论如下： |
| Other Abstract | In the actual use of lubricating oil, water is often inevitably mixed into the lubricating oil in various ways, resulting in a decrease in the lubricating performance of the lubricating oil. Therefore, it is of great practical significance to remove water from lubricating oil and reuse lubricating oil for mechanical operation safety, resource recovery and environmental protection. In recent years, superhydrophobic materials have been widely used for oil-water separation. However, the mechanical properties of the micro-/nanohierarchical structures of the superhydrophobic surfaces are not stable, which greatly limiting their practical applications. To date, much works have been focused on the effect of mechanical damage on the superwetting properties of interface materials. However, the effect of mechanical damage on the application performance of interface materials, especially for the separation of water-in-lubricating oil emulsions, has not been studied. In this paper, starting from the practical problem that water is mixed into lubricating oil easily, through the development of a variety of stable superhydrophobic membranes, various common water-in-lubricating oil emulsions were subjected to emulsion separation. The water in the lubricat oil was removed to restore the lubricating performance as pure oil and can be reused. We explored the effect of water on the lubricating performance of lubricating oils and the failure mechanism of water-containing lubricating oils. The main research contents and conclusions are as follows: 1. Removal of water in lubricating oils. Using the spray method, the suspension containing titanium dioxide nanoparticles and aluminum phosphate was sprayed on the surface of the stainless steel mesh and cured by heating, then modified by chemical vapor deposition of 1H,1H,2H,2H-perfluorodecyltriethoxysilane to obtain the robust superhydrophobic film (AP-SiO2-FOTS-SSM). Different common types of lubricating oils (PAO, ultra-S8, MACs, 150SN and PAO containing tricresol phosphate additives) were selected as the research objects. The study found that when the water content of the lubricating oils increases, the lubricating performance decreases accordingly. The prepared film can effectively remove the water in the water-in-oil emulsions and restore the lubricating performance. Moreover, after 50 sandpaper abrasion cycles, the membrane can still maintain the superhydrophobic proformance, high-efficiency emulsion separation, and good lubricating property of the purified lubricating oil. In addition to accelerating wear and corrosion, lubricating oil contaminated with water generates a large amount of carbon-based debris through catalytic dehydrogenation of iron-containing wear debris. This work provides promising guidance for solving the failure of lubricating oil caused by water. 2. Removal of water in ZDDP-containing lubricating oil. Using the spray method, the suspension containing silica nanoparticles and aluminum phosphate is sprayed on the surface of the stainless steel mesh and cured by heating, and then modified by chemical vapor deposition of 1H,1H,2H,2H-perfluorodecyltriethoxysilane to obtain the stable superhydrophobic membrane (AP-SiO2-FOTS-SSM). In order to be closer to the actual application, the most common lubricating oil (Poly-alpha-olefin, PAO) containing quantitative additives (zinc dialkyldithiophosphate, ZDDP) was selected as the research object. Due to the presence of additives such as ZDDP, water as a contaminant can cause the failure of the lubricating oil and form a highly stable emulsion. It was found that under high contact pressure, the more water in the lubricant containing ZDDP, the more serious friction and wear will result. The prepared film can effectively remove the water in the water-in-oil emulsion containing additives and restore lubricating performance. Importantly, the membrane maintains superhydrophobicity even after 100 cycles of sand impingement, efficient emulsion separation, and low wear volume and coefficient of friction of the purified lubricating oil. The study found that the water in the ZDDP-containing lubricating oil greatly exacerbated the wear and corrosion, and at the same time produced iron oxides as active sites to cause the catalytic dehydrogenation of the lubricating oil, resulting in excessive carbon-based debris deposition. This finding reiterates the importance of removing moisture from lubricating oils containing ZDDP, and provides a highly practical method for solving the failure caused by water. |
| Language | 中文 |
| Document Type | 学位论文 |
| Identifier | http://ir.licp.cn/handle/362003/27336 |
| Collection | 固体润滑国家重点实验室（LSL） |
| Affiliation | 1.中国科学院兰州化学物理研究所; 2.中国科学院大学 |
| Recommended Citation GB/T 7714 | 赵思洋. 超疏水膜用于去除润滑油中的水并恢复润滑性能[D]. 北京. 中国科学院大学,2018. |
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| File Name/Size | DocType | Version | Access | License | ||
| 202043赵思洋.pdf（6479KB） | 学位论文 | 开放获取 | CC BY-NC-SA | View Application Full Text | ||
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