硼酸酯在聚醚水溶液中的摩擦学性能研究

发布时间：2018-01-04 04:08

本文关键词：硼酸酯在聚醚水溶液中的摩擦学性能研究　出处：《北京交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着资源的可持续性发展和环保理念的不断提高,绿色无污染的水基润滑液受到了越来越多的青睐。但是,水基润滑液的成膜、润滑和防腐蚀等性能相对较差,因此需要选择性能优良的水溶性润滑添加剂来改善其摩擦学性能。本研究选取十二醇无规共聚醚(Dodecanol randomcopolyether,CPE)和二异丙醇胺环硼酸酯(Triisopropanolamineborate,BN)为添加剂,分别对CPE和CPE-BN两种水溶液进行相关的摩擦学试验研究。首先,利用四球试验机对两种水溶液进行摩擦磨损性能研究,主要分析其减摩抗磨性能、稳定性能和极压性能,然后利用三维白光共聚表面形貌仪和X射线光电子能谱分析仪对钢球磨斑表面进行分析。结果表明,两种水溶液均具有较好的减摩性能,加入BN后,CPE水溶液的抗磨性能和稳定性能均有所提高,最大无卡咬负荷(PB值)增大了 11.6%,极压性能有所提高。CPE-BN水溶液的性能之所以提高主要是因为在摩擦过程中形成了化学吸附膜和化学反应膜,二者共同作用起到了良好的润滑效果。其次,利用旋转流变仪对两种水溶液进行流变学性能研究,主要分析其流体特性和黏度变化。结果表明,在较高浓度的条件下,两种水溶液均呈现出伪塑性流体特性;水溶液的浓度越大,黏度越大;加入BN后,CPE-BN水溶液黏度有所减小。最后,利用纳米膜厚测量仪对两种水溶液进行成膜性能研究,主要分析其在不同载荷、浓度和线速度下的成膜能力。结果表明,CPE和CPE-BN两种水溶液的成膜能力较好,当浓度达到3%以后,其膜厚变化与浓度关系不大;随着载荷的增大,二者的膜厚均有所减小;随着线速度的增大,膜厚逐渐增大,当达到500mm/s以后,膜厚稳定在25nm左右,二者处在薄膜润滑和边界润滑区,同时伴有混合润滑状态。研究结果表明CPE和BN两种水溶性添加剂协同润滑效果较好,工业应用前景良好,可作为绿色水基型润滑添加剂。
[Abstract]:With the sustainable development of resources and the continuous improvement of the concept of environmental protection, green non-polluting water-based lubricating fluids have been more and more favored. However, the film-forming, lubrication and corrosion resistance of water-based lubricating fluids are relatively poor. Therefore, it is necessary to select water-soluble lubricating additive with excellent performance to improve its tribological properties. Dodecanol randomcopolyether. CPE) and triisopropanolamine borate (BN) were used as additives. The tribological properties of CPE and CPE-BN aqueous solutions were studied respectively. Firstly, the friction and wear properties of two aqueous solutions were studied by four-ball test machine, mainly analyzing their anti-friction and anti-wear performance. The stability and extreme pressure properties were analyzed by using 3D white light copolymerization surface topography instrument and X-ray photoelectron spectroscopy analyzer. The results show that both aqueous solutions have good antifriction performance. After adding BN, the antiwear and stability properties of CPE aqueous solution were improved, and the maximum value of PB without biting load was increased by 11.6%. The properties of the aqueous solution of .CPE-BN have been improved due to the formation of chemisorption and chemical reaction films during the friction process. In addition, the rheological properties of two aqueous solutions were studied by rotating rheometer, and the fluid properties and viscosity changes were analyzed. Under the condition of higher concentration, both aqueous solutions exhibit pseudoplastic fluid characteristics. The higher the concentration of aqueous solution, the greater the viscosity. The viscosity of CPE-BN aqueous solution was decreased after adding BN. Finally, the film forming properties of two aqueous solutions were studied by using nanofilm thickness measuring instrument, and the properties of CPE-BN aqueous solution under different loads were mainly analyzed. The results show that the film forming ability of the aqueous solution of CPE-BN and CPE is better. When the concentration reaches 3%, the change of film thickness is not related to the concentration. The film thickness decreases with the increase of load. With the increase of the linear velocity, the film thickness increases gradually. When the film thickness reaches 500 mm / s, the film thickness is stable at about 25 nm, both of them are in the film lubrication and boundary lubrication region. The results show that CPE and BN can be used as green-water based lubricating additives because of their good synergistic lubricating effect and good prospect of industrial application.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH117

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