水—乙二醇难燃液压液的制备研究

发布时间：2018-03-26 05:28

  本文选题：抗燃性　切入点：极压抗磨　出处：《天津科技大学》2017年硕士论文

【摘要】：水-乙二醇难燃液压液是目前使用最为广泛的难燃液压液之一,其对环境友好、成本较低、系统无需修改即可使用以及其使用寿命较长。但是由于它属于水基类型难燃液压液,所以耐燃性很好。但是防锈能力和承压抗磨能力有待改善。因此,研究并制备润滑性优异的水-乙二醇难燃液压液具有重要的意义。本文采用四球试验机对不同物质的摩擦学性能进行了研究。测试了添加量不同时,油酸三乙醇胺、二聚酸钾以及混合物在基础液(水、乙二醇及增稠剂)中的摩擦学性能。包括摩擦系数(f)、最大无卡咬负荷(PB)以及磨斑直径(WSD)。测试结果表明,这三种物质均有较好的润滑性。当油酸三乙醇胺质量分数为7%时,其PB是基础液的3.7倍,WSD与f分别减小了 15%和39%;当二聚酸钾质量分数为3%时,其PB是基础液的3.2倍,WSD与f分别减小了30%和30%;二聚酸钾以及油酸三乙醇胺以质量比3:7,配合成混合物。其质量分数为5%时,其PB是基础液的5.8倍,WSD与f分别减小了37% 和 40%。以二聚酸钾与油酸三乙醇胺的质量比3:7,配合成混合物。并以其质量分数为5%作为极压抗磨剂制备难燃液压液,对自制难燃液压液进行以上摩擦学测试,以及倾点、铜片腐蚀、pH值、泡沫特性等性能测试,并与市售样品A和B进行性能对比。自制难燃液压液PB为1166N,WSD为0.40mm,摩擦系数为0.054。倾点小于-42℃,pH值为9.4,铜片腐蚀级别为1a级,泡沫特性满足国标;市售样品A的PB为1000N,磨斑直径为0.59mm,摩擦系数为0.078;市售样品B的PB为902N,磨斑直径为0.55mm,摩擦系数为 0.088。对自制水-乙二醇难燃液压液四球机测试后的钢球表面磨斑的形貌以及元素通过扫描电子显微镜和EDS进行分析。基础液润滑条件下的磨损最是严重,其磨痕深而密同时还有钢球表皮剥落和明显的犁沟。市售样品A和B中,钢球表面也有较深划痕及表皮的轻微脱落。自制难燃液压液润滑条件下,钢球摩擦表面的磨痕较浅,没有明显的沟痕。相比于基础液和市售样品,磨斑更为平整。EDS图中存在元素C、O和N的峰,是油酸三元乙醇胺和二聚酸钾牢牢的吸附在金属元件的表面并且发生化学反应,从而形成坚固的有机化学反应膜及物理吸附膜。
[Abstract]:Water-glycol refractory hydraulic fluid is one of the most widely used refractory hydraulic fluids at present. It is environmentally friendly, low-cost, the system can be used without modification and its service life is long. So the flammability is very good. But the anti-rust ability and the pressure anti-wear ability need to be improved. It is of great significance to study and prepare water-glycol refractory hydraulic fluid with excellent lubricity. The tribological properties of different substances have been studied by a four-ball tester. Tribological properties of potassium dimer and its mixtures in the base solution (water, ethylene glycol and thickener). These include friction coefficient FG, maximum free bite load PBB, and abrasive spot diameter WSDN. When the mass fraction of triethanolamine oleate is 7, the PB is 3.7 times of the base solution and the WSD and f of the base solution are decreased by 15% and 39%, respectively, and when the mass fraction of potassium dimer is 3, the content of PB decreases by 15% and 39%, respectively, when the mass fraction of potassium dimer is 3, PB was 3.2 times as much as the base solution and WSD and f were reduced by 30% and 30%, respectively. Potassium dimer and triethanolamine oleate were mixed into a mixture with a mass ratio of 3: 7. The PB is 5.8 times as much as the base solution and WSD and f are reduced by 37% and 40% respectively. The mixture is prepared by using the mass ratio of potassium dimer and triethanolamine oleate as 3: 7, and its mass fraction is 5% as extreme pressure antiwear agent to prepare refractory hydraulic fluid. The above tribological tests were carried out on the self-made refractory hydraulic fluid, as well as the performance tests such as pour point, corrosion pH value of copper sheet, foam characteristics, etc. Compared with the commercial samples A and B, the self-made refractory hydraulic fluid PB = 1166NU WSD is 0.40mm, the friction coefficient is 0.054, the pour point is less than -42 鈩，

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