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2 2002

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Właściwości smarne wodnych roztworów oksyetylenowanych estrów sorbitanu

Sułek W., Wasilewski T.

Tribologia

2002

nr 4

1303-1311

W pracy prezentowane są wyniki badań wodnych roztworów oksyetylenowanych monoestrów sorbitanu (OE MES) stosowanych jako kompozycje smarowe. Analizowano wpływ typu związku i jego stężenia na współczynnik tarcia, zużycie i wielkość temperatury w węźle tarcia. Badania tribologiczne prowadzono z użyciem aparatu czterokulowego w skojarzeniu materiałowym stal-stal. Przeprowadzono 900-sekundowe testy pod stałym obciążeniem 2kN, przy prędkości obrotowej 200 obr./min. Jako kompozycje smarowe stosowano wodne roztwory oksyetylenowanego monolaurynianu sorbitanu (ESL), oksyetylenowanego monostearynianu sorbitanu (ESS) i oksyetylenowanego monooleinianu sorbitanu (ESO). Na podstawie uzyskanych rezultatów stwierdzono, że najkorzystniejszą zdolność zmniejszania oporów ruchu i obniżania temperatury w węźle wykazywały roztwory l-, 30- i 50-procentowe. Z kolei w miarę wzrostu stężenia wodnych roztworów oksyetylenowanych estrów sorbitanu obserwowano polepszanie ich właściwości przeciwzużyciowych.

The paper presents results of tribological tests of ethoxylated sorbitan esters water solutions, which were applied as lubricants. The influence of the type of compounds and concentrations on the friction coefficient, wear and temperature were investigated. The tests were performed on the four ball machine. Test duration was 900s, applied load: 2kN, rotating speed: 200rpm. 1%, 4%, 10%, 30% and 50% ethoxylated sorbitan monolaurate, ethoxylated sorbitan monostearate and ethoxylated sorbitan monooleate water solutions were applied as lubricants. It was concluded that 1%, 30% and 50% water solutions have best ability to reduce motion resistance and to lower temperature. On the other hand, along with increasing of the concentration of ethoxylated sorbitan esters water solutions, better antiwear properties were observed.

The effect of concentration of aqueous solutions of ethoxylated sorbitan esters on antiseizure properties

Sułek W., Wasilewski T.

International Journal of Applied Mechanics and Engineering

2002

Vol. 7, Spec. is

189-195

Influence of compound's type and concentration of ethoxylated sorbitan ester (ESE) water solutions on their anti-seizure properties was investigated. Ethoxylated sorbitan monolaurate (ESML), ethoxylated sorbitan monostearate (ESMS) and ethoxylated sorbitan monooleate (ESMO) were used as lubricant additives. Tribological tests were performed on the four-ball machine, at linearly increasing load (409N/s) (tribosystem: steel-steel). Basing on the scuffing load (the load at the moment of rapid increment of friction torque) anti-seizure properties of the solutions were assessed. The other measured parameter was the seizure load, that is load at the moment when friction torque exceeded 10Nm. The limiting pressure of seizure was evaluated according to the formula: poz=0,52*Poz/d2 where Poz - seizure load, d - wear scar diameter. According to the results obtained one can say that addition of ESE to water significantly improves its anti-seizure properties. The measured tribological quantities strongly depend on concentration. 0.001%; 0.005%; 0.01%; 0.05%; 0.1%; 0.5% and 1% aqueous solutions were tested. The best anti-seizure properties were observed for ethoxylated sorbitan monostearate and monooleate. The results obtained can be interpreted as a consequence of a formed liquid crystalline structure near the surface. The presence of mesophases in water solutions of ethoxylated sorbitan esters was confirmed by observations in polarized light and characteristic changes of the viscosity.