Influence of Polyethylene Glycol Molecular Weight on the Tribological Properties of Synthesized Water-soluble Polyether Ester
To improve the water solubility and friction properties of water-soluble polyether esters,three types of poly-ethylene glycol with relative molecular weights(1 500,2 000,4 000)were esterified with small molecular weight n-hep-tane acid to prepare three types of polyether ester(PEEs)additives.The molecular structure and functional groups of the prepared PEEs were characterized by infrared spectroscopy and nuclear magnetic resonance spectroscopy.SRV-V testing machine and tapping torque test bench were used to investigate the tribological performance of PEEs in deionized water,and non-contact three-dimensional profiler and scanning electron microscope(SEM)were used to analyze the morphology of the wear scar surface of the sample after fiction test.The lubrication mechanism of PEEs was analyzed by X-ray photoe-lectron spectroscopy(XPS),and the anti-foaming properties,high and low temperature stability and anti-corrosion prop-erties of PEEs additives were evaluated.The results show that PEEs exhibit excellent anti-wear and friction reduction performance in deionized water,because the ester functional groups in the PEEs structure can strongly interact with the surface of metal friction pairs to form a relatively strong adsorption film.The aqueous solution with PEEs mass fraction of 3％has the lowest friction coefficient and the smallest wear volume.As the molecular weight of polyethylene glycol increa-ses,the anti-wear and friction reducing properties of PEEs aqueous solution gradually weakens.Three types of PEEs aque-ous solutions have good high and low temperature stability and anti-corrosion properties,and their anti-foaming properties is comparable to the two commonly used reverse block polyethers.This is because the PEEs structure contains hydrophobic long-chain alkyl groups,which are beneficial for improving anti-foaming performance of aqueous solutions.
water-soluble polyether esteranti-wearfriction reductionfoam resistancehigh and low temperature stability
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