The Study Of Metal Cutting Fluid Microemulsion

Microemulsion metal cutting fluids usually consists of oil, water，surfactant andco-surfactant formed by transparent or translucent liquid stable system. Cutting fluids widelyused in the modern metal cutting processing, become an indispensable auxiliary materialsmechanical of the manufacturing process. Additive is the core elements in metal cutting fluidtechnology, the fine additive formula has become necessary conditions in cutting fluidsproduction of enterprise to improve their own brand market competitive.In order to makemore preparation of the green, efficient cutting fluids, do the research of micro emulsioncutting fluid.The results show that the sequence，way of agitation, and stirring time basically have noinfluence on the microemulsion preparation of metal cutting fluid; And sequence andtemperature of the preparation have different influence on the stability,first adding water thensolubilizer and30℃have high stability for microemulsion preparation of metal cutting fluid.The results show that there are maximum water solubilization when the dosage of ethanol is1.0%. m (ethanol): m (EM)=1:3, m (isoamyl alcohol): m (EM)=1:5,there are the largestsingle-phase microemulsion region and the largest amount of water solubilization; Bythermodynamic studies we found that ethanol and isoamyl alcohol affect this process thechanges of thermodynamic functions. During the formation of the micro-emulsion, thestandard free energy changesâ–³Gs <0and the standard enthalpy changeâ–³Hs=0whenethanol and isoamyl alcohol from the continuous phase of the oil phase into the layer ofmicroemulsion interface; this is the non-thermal effects of the process;â–³Gs is decided bychaos entropyâ–³Ss of degree of alcohol molecular.Study on aggregation properties ofnonionic surfactant of fatty alcohol-polyoxyethylene ether by steady-state fluorescence probemethod:CMC values for stright-chain, branched-chain, aromatics alcohol ether were0.2mmol/L,0.1mmol/L,0.05mmol/L,respectively, Nm values for stright-chain, branched-chain,aromatics alcohol ether were1168，255，6.0. The experimental results showed that the FAPEseries nonionic surfactant, Critical micelle concentration and micelle aggregation numberdecrease as carbon chain structure from straight-chainâ†'branched-chainâ†'aromatics.The effection of surfactant on the stability of cutting fluid,The experiment results show:(1) a combination of two surfactants, one fatty alcohol-polyoxyethylene ether and oneco-surfactant is preferred over a single surfactant;(2)the linear chain and aromatic fattyalcohol-polyoxyethylene ether surfactant are more easier to produce more stable emulsionsthan the other two fatty alcohol-polyoxyethylene ether;(3) on the same type fattyalcohol-polyoxyethylene ether，the more number of the head group EO，the more difficult toproduce stable emulsions，it can produce more stable emulsions when the EO number is5;(4)In the co-surfactant，T-60，T-20，MOA-6with4surfactant can yield stable emulsions，butpolyethylene glycol cann’t;(5) from the foaming height，TX-5:oil=2:1or3.5:1could form smaller foaming height and are easier dissipate;(6)three type of co-surfactants(T-60，T-20andMOA-6)，investigate the tail group(the number of C) differences between them and4typesurfactants(EO=5)，discover that with regard to T-60， C=11and12form the more number ofstable formulations，to T-20， C=6and9，to MOA-6， C=1and3form more stableformulations;(7)when TX-5is applied alone and mutual use TX-5and0.02M T-60，mutualuse TX-5and0.02M MOA-6form the formulations of droplet diameter，single use TX-5，mutual use TX-5and0.02M MOA-6could form the nanoscale droplets;(8) study thesimilarity surfactant packages (the number of EO) for a formulation system of differentsurfactant and oil，result discover:only form at most2，in the peanut oil and soybean oilsystem，in the peanut oil and synthetic ester system，linear chainalcohol ether and aromaticalcohol ether could form more stable formulations，the number of EO separately take up52%and76%ï¼›in the soybean oil and synthetic ester system，branched chain alcohol ether andaromatic alcohol ether could form more stable formulations，they take up66%in the same.All recipes using oil sulfonate (AM) of such anionic surfactants can improve hardwater stability the petroleum and bio-based formulations, even if the formula is not thepresence of coupling agents.Oil to total surfactant molar ratio of0.5or less in hard watercan form a stable particle size; newly developed petroleum and bio-based formulations toenhance stability in hard water with commercially available metal cutting fluid are different,they are evaluated by the contact angle, tapping torque efficiency.