Studies On Preparation And Performance Of Microemulsified Oil

In the copper processing industry, the requirements of copper quality (especially surface quality) are more stringent.The effective lubrication technology can improve the surface quality, extend the life of roller and low power consumption. Microemulsified oil is a diaphanous or semi-diaphanous, isotropy and thermally stable W/O system, blended with base oil, surfactant, cosurfactant, oiliness agent, water and other compositions. Before using, it should be diluted with water into O/W emulsion, which offers lubrication and antirust characteristics of oily processing fluid,as well as cooling and cleaning characteristics of water-based processing fluid, brings little pollution, and generates waste easy to dispose. Such kind of emulsion can satisfy almost all kinds of machining and it bears a wide application prospect. The paper studied the preparation of microemulsified oil, as well as the physical and chemical properties of the microemulsion and emulsion, the results showed that the microemulsion was stable, and the emulsion had good properties of wettability, lubrication, cooling, detergency and antirust.Firstly, the main additives of the microemulsion were studied and the best one was chosen. The main components were obtained: base oil: mineral oil (7 #∶10 #) (w / w) =20∶3, surfactant: A (oleicacid∶t riethanolamine∶Sodium petroleum sulfonate∶6 501)∶B (Span80∶P EG400) (w/w)= (9∶3∶1 2∶3)∶(14∶7), n-butanol as cosurfactant, surfactant∶cosurfactant (w / w) = 8∶1, 0.02 mol/LCaCl2 solution.Then, the feeding order during the preparation of the microemulsion was investigated In the preparation of microemulsion, the pro-oil surfactant and cosurfactant dissolved in oil, then added the hydrophilic surfactant, after that mixed with water by stirring.we studied the effect of different ratio of surfactant, dosage of cosurfactant and density of electrolyte on pseudo-ternary phase diagram, as well as changes of the physicochemical property of the system during phase transition, such as conductivity, viscosity , particle size,as a result we can infer the microstructure changes of the system.Then we researched the stability of the sample which was prepared according to the feasible formulation, thereby got a range of stable microemulsion as follows: the content of part B could not be high in the mixture of A and B, surfactant∶c osurfactant (w / w) = 4∶1,0.02 mol/L CaCl2 solution, the weight percent of surfactant and cosurfactant should be more than 40% ,and the moisture content should not be more than 33.3%.Finally, the application properties of the feasible microemulsions were studied. By the comparison of high temperature stability, wettability, lubrication, annealing detergency and antirust, and in accordance with the requirements of good in quality and low in price, the formula was fixed as follows: 7 #∶# 10 (w / w) = 20∶3, K = 9∶2, EM∶oil∶water(w / w) = 18∶1 2∶10. Microemulsion was not hierarchical even if centrifugated under 10000rad/min,and was not turbidity or hierarchical under 0℃and 50℃for 72h. The average diameter of the microemulsion was 38.4 nm.There was no educt from emulsion under 95℃for 2h,the average diameter of the emulsion was 38.4 nm,and the effect of high temperature was not significant, the contact angle of emulsion and T2 copper was 29.5°, the coefficient of friction of the emulsion was 0.17955, pHwas 7.3 and the emulsion had good properties of annealing detergency and antirust.