Study on the properties of oleic acids modified by polyethylene gtlycol
In order to improve the stability of hydraulic fluid and ensure the reliability of hydraulic support following the machine,oleic acid from four manufacturers and the influence on the particle size of hydrau-lic fluid containing modified oleic acid were studied.The composition of each oleic acid was analyzed by GC-MS,and oleic acid was modified by alcohol amine and polyethylene glycol respectively.The lubricity,surface tension,pH value,conductivity,Zeta potential and particle size of modified oleic acid in aqueous solution,as well as the particle size of hydraulic fluid containing modified oleic acid in different liquid concentrations were investigated.The results show that oleic acid modified by alcohol amine can precipi-tate in 500 mg/L artificial hard water,but oleic acid modified by polyethylene glycol can not precipitate.Oleic acid modified by PEG with less impurity content had higher surface tension,higher Zeta potential and smaller particle size.The diameter of the hydraulic fluid prepared by using polyethylene glycol modi-fied oleic acid is smaller than that prepared by using alcohol amine modified oleic acid,the average diam-eter is less than 100 nm,and the hydraulic fluid has stronger filter-ability and higher stability.
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