A study of the rheological behaviour of multigrade oils

Hassanean, Mohamed; Bartz, W. J.; Naga, H. H. El Abou

doi:10.1002/ls.3010100104

Cited by 6 publications

(6 citation statements)

References 3 publications

(1 reference statement)

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“…The values of dynamic viscosity versus the shear rate at 40 and 100°C are given in Figure 6A,B. From the results, it is clear that the non‐Newtonian behavior was observed for pure lube oil at a lower shear rate while at a higher shear rate it follows the Newtonian behavior 38 . For lube oil blended with polymeric additives at 5000 ppm of concentration, it is found that viscosity gradually decreases at the low shear rate (5–35 s −1 ) while remains constant at the higher shear rate 39 .…”

Section: Resultsmentioning

confidence: 92%

Amide polymers based on N‐phenyl‐p‐phenylenediamine with α‐olefins‐co‐maleic anhydride as multifunctional additives for lubricant application

Faujdar

Singh

2022

Polymers for Advanced Techs

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The high temperature and harsh oxidizing conditions in engine sump results in sludge and varnish deposits in the engine, due to which wear debris and corrosion developed in the internal parts of the engine. This is also responsible for the increased oil viscosity. To address these problems, four polymeric multifunctional amides of N‐phenyl‐p‐phenylenediamine were synthesized from copolymer intermediates poly(α‐olefins‐co‐maleic anhydride) having C‐12, C‐14, C‐16, and C‐18 chain length. This article describes the systematic study of poly(α‐olefin‐co‐maleic anhydride)amides chemistry as multifunctional lubricant additives. Molecular elucidation was carried out by Fourier transform infrared and nuclear magnetic resonance while molecular weight and thermal stability were measured by gel permeation chromatography and thermogravimetric analysis. Standard methods were used to analyze the viscosity‐temperature relationship along with detergent‐dispersant, anti‐oxidant, and anti‐corrosion activities in reference base oil at varying concentration levels. All the prepared polymer compounds effectively addressed the concern problems, but poly(octadecene‐co‐maleic anhydride)amide of N‐phenyl‐p‐phenylenediamine showed better performance over the other additives due to the increased solubility. The pour point depressed from the base value −15 to −30°C while viscosity index (VI) increased to 197 from 178 with longer chain additive at 5000 ppm concentration. Dispersancy was found to be increased by 145%, while as far detergency was concerned, sludge deposition was reduced to 20.1 mg from 87.5 mg base value of reference base oil at 5000 ppm. 2,2‐diphenyl‐1‐picrylhydrazyl assay was used to determine the anti‐oxidant activity and at 1000 ppm, long alkylated polymer shows the excellent result by increasing the inhibition efficiency by 95.58% while the same additive impart the best results at 5000 ppm by reducing the corrosion and penetration rate by 75.80% and 75.43% respectively. Rheology also studied to examine the shear and temperature effect on the dynamic viscosity of the reference oil.

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Section: Resultsmentioning

confidence: 92%

Amide polymers based on N‐phenyl‐p‐phenylenediamine with α‐olefins‐co‐maleic anhydride as multifunctional additives for lubricant application

Faujdar

Singh

2022

Polymers for Advanced Techs

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“…Figures (1) through (3) shows a rheological study of Polymethacrylates that has been carried out by M.H.M. Hassanean [4]. The blends have been studied at different temperatures and shear rates and the results showed the same behavior.…”

Section: Introductionmentioning

confidence: 89%

“…This generates more friction which in turn generates more heat. Energy or power losses and poor cold starting pumpability can also all resulted from lubricant over-thickening [4]. However, too low viscosity is not desirable too, as it causes excessive wear due to the loss of the load bearing characteristics of the oil.…”

Section: /16mentioning

confidence: 99%

Rheological Behavior of Lubricating Oil With Polyacrylates Copolymers

Mohamad.¹,

Ahmed²,

Hassanein³

et al. 2012

The International Conference on Chemical and Environmental Engi

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Six copolymers based on acrylates were used as viscosity index improvers [1]. The effect of these copolymers on the rheological behavior such as viscosity thinning or thickening has been studied. A rheological study was carried out to SAE 30 base oil before and after adding the viscosity index improvers with different concentrations (1, 2, 3% wt). Brookfield rheometer model (DV-III+) was used with different shear rates and at different temperatures (40, 60, 100 ˚C), for characterization of the enhanced lubricant. It was noticed that Freeadditives Base oil exhibits a Newtonian behavior at all temperatures, on the other hand; all enhanced samples exhibit a weak non-Newtonian behavior that disappears with increasing either temperature or shear rate or both of them. The effect of temperature on specific viscosities of the blends under different shear rates was studied to determine the efficiency of viscosity index improvers and record its mechanism of action at different shear rates and temperatures.

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“…The viscosity of the lube oil without any additives is approximately constant with increasing the shear rate. This indicates that pure lube oil behaves like a Newtonian fluid at any shear rate [33]. For lube oil with additives, it is found that at low shear rate (5-30 s -1 ), the viscosity gradually decreases and the lubricant behaves like a non-Newtonian fluid [34].…”

Section: Analysis Of Rheological Studymentioning

confidence: 96%

Dodecyl methacrylate and vinyl acetate copolymers as viscosity modifier and pour point depressant for lubricating oil

et al. 2017

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The article presents application of homo polymer of dodecyl methacrylate (DDMA) and its copolymers with vinyl acetate (VA) as multifunctional additives for lubricant formulation. Homo polymer of DDMA and five copolymers of DDMA with VA at different molar ratios were synthesized by free radical polymerization method using azobisisobutyronitrile (AIBN) as initiator. The characterization of the polymers was carried out through FTIR, NMR and GPC (gel permeable chromatography) analysis. The performance of all the polymers as viscosity index improver (VII) or viscosity modifier and pour point depressant (PPD) additive in two different base oils (mineral) were evaluated. The mechanism of action of the polymers as pour point depressant was studied by photo micrographic analysis. Rheological study of the formulated lubricant was also carried out and reported. The thermal stability of the polymers was determined by thermogravimetric analysis (TGA). It was found that thermal stability, VI and molecular weights of copolymers are higher than the homopolymer which showed better PPD property.

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A study of the rheological behaviour of multigrade oils

Cited by 6 publications

References 3 publications

Amide polymers based on N‐phenyl‐p‐phenylenediamine with α‐olefins‐co‐maleic anhydride as multifunctional additives for lubricant application

Amide polymers based on N‐phenyl‐p‐phenylenediamine with α‐olefins‐co‐maleic anhydride as multifunctional additives for lubricant application

Rheological Behavior of Lubricating Oil With Polyacrylates Copolymers

Dodecyl methacrylate and vinyl acetate copolymers as viscosity modifier and pour point depressant for lubricating oil

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