The Study And Preparation Of Water-glycol Fire-resistant Hydraulic Fluid

Water-glycol fire-resistant hydraulic fluid is one of the most widely used hydraulic fluids. It is environment-friendly, low cost, the system can be used without modification and its service life is long, but because of its water-based resistant hydraulic fluid, so it has excellent flame resistance, but its corrosion resistance and extreme pressure resistance need to be improved. Therefore, it is of great significance to improve the corrosion resistance and Lubrication performance of water-glycol refractory fire-resistant hydraulic fluid.In this paper, the tribological properties were studied by four-ball tester. Testing the friction coefficient, the maximum no card bit load (PB) and ground spot diameter (WSD) of dimer acid potassium, triethanolamine oleate and the mixture of triethanolamine oleate and dimer acid potassium in differene addition amount in the base fluid. The results show that these three kinds of products have better extreme pressure and wear resistance. When the mass fraction of triethanolamine oleate was 7%, its PB was 3.7 times of base fluid, the WSD and friction coefficient were reduced by 15% and 39% respectively. When the mass fraction of dimer acid potassium was 3% PB was 3.2 times of the base fluid, and the WSD and friction coefficient were reduced by 30% and 30% respectively. The mixture of triethanolamine oleate and dimer acid potassium was blended at a mass ratio of 3:7 and its mass fraction was 5%, The PB is 5.8 times the base fluid, WSD and friction coefficient were reduced by 37% and 40%.In this paper,a mixture of triethanolamine oleate and dimer acid potassium was used in the mixture of 3:7, and 5% of the mixture was used as the anti-wear agent to prepare the fire-resistant hydraulic fluid. Tribological tests, and pour point, copper corrosion, pH, foam properties and other performance tests be tesed. And to compare this performance with the performance of commercially available samples A and B. The PB of self-made fire-resistant hydraulic fluid is 1166N, the WSD is 0.40mm, the friction coefficient is 0.054, the pour point is less than -42?, the pH value is 9.4, the copper corrosion test is la grade, the foam property meets the national standard; The PB of A is 1000N, the WSD is 0.59mm and the friction coefficient is 0.078. The PB of B is 902N, the grinding spot diameter is 0.55mm and the friction coefficient is 0.088.In this paper, the surface morphology and elemental analysis of the surface of steel ball were analyzed by scanning electron microscope and EDS. The wear and tear Base of fluid lubrication conditions is the most serious, the wear marks deep and dense as well as steel ball skin peeling and obvious furrow. In commercially available sample A and commercially available sample B, the surface of the steel ball also had obvious deep groove and slight shedding of the epidermis. Under the condition of self-made fire-resistant hydraulic fluid lubrication, the worn surface of the steel ball wear surface was shallower,and no obvious furrow, Compared to the base fluid and commercially available samples, the surface of the steel ball are smoother. EDS diagram of the presence of elements C, O and C peaks, is the triethanolamine oleate and dimer acid potassium firmly adsorbed on the surface of metal components and chemical reaction, resulting in a solid organic chemical reaction film and physical adsorption film.