Compatibility study of common sealing elastomers with a biolubricant (Jatropha oil)

Farfán-Cabrera, Leonardo Israel; Gallardo-Hernández, Ezequiel Alberto; Perez‐González, José

doi:10.1016/j.triboint.2017.06.039

Cited by 25 publications

(10 citation statements)

References 22 publications

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“…The plant has a high oil content; it can grow on marginal lands in tropical and sub-tropical climates enabling an extensive oil source supply, and it is not considered as human feedstock [11,21]. It has been demonstrated that JO exhibits better tribological properties than other bio-oils, for example, rapeseed oil [10] and is compatible with different sealing elastomers from fuel and lubrication systems [22,23,24]. It has also been reported that the frictional coefficients are reduced by blending JO with mineral oils for different applications, namely, hydraulic fluids [25], engine oils [14], metal working fluids [26,27], automatic transmission fluids [28], drilling muds [29], etc.…”

Section: Introductionmentioning

confidence: 99%

Effects of Jatropha lubricant thermo-oxidation on the tribological behaviour of engine cylinder liners as measured by a reciprocating friction test

Farfán-Cabrera

Gallardo-Hernández

Perez‐González

et al. 2019

Wear

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Bio-lubricants have emerged as a potential and viable way to replace, totally or partially, mineral oils due to their effectiveness in the boundary lubrication regime for different applications, including, automotive engine operation. However, the effect of thermo-oxidation caused by the long-term use of the bio-lubricants on their tribological properties has been scarcely analyzed. In this work, the effect of thermo-oxidation of Jatropha oil (JO), an engine mineral oil (EMO) and a blend made up of 80%vol. EMO and 20%vol. JO (B20) on the tribological behavior of a simulated piston ring/engine cylinder liner interface was studied in reciprocating friction tests at 26 and 100°C. The oils were thermally oxidized and characterized in terms of carbonyl compounds, depletion of ZDDP additives, changes in kinematic viscosity and viscosity index. Friction coefficients, wear rates and scar morphologies were assessed. Thermo-oxidation resulted in significant viscosity increases in JO compared to EMO and B20. Also, it generated increased friction coefficients for JO and B20. However, they were lower than those for fresh and aged EMO. EMO increased the wear rate after thermo-oxidation in contrast to JO. Smearing was generated using most oil samples while severe scuffing was only produced by using fresh JO at 100°C.

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Section: Introductionmentioning

confidence: 99%

Effects of Jatropha lubricant thermo-oxidation on the tribological behaviour of engine cylinder liners as measured by a reciprocating friction test

Farfán-Cabrera

Gallardo-Hernández

Perez‐González

et al. 2019

Wear

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“…As highlighted in Section 1.1, Fafan-Cabrera et al (11) found high levels of swell in static emersion tests with EPDM and mineral based engine oil and low levels for jatropha oil. The molecular weight of jatropha oil is 866 kg/kmol (23), this is close to the molecular weight of palm oil, at 846 kg/kmol (24), so they should possess a similar diffusion quality.…”

Section: Mass Changementioning

confidence: 92%

“…As far as the authors know, Fafan-Cabrera et al (11) published the only work found on the compatibility of bio-lubricants and elastomers. They used FKM, SR, CR and EPDM elastomers with jatropha oil in static immersion tests.…”

Section: Degradation Of Seals Exposed To Lubricantsmentioning

confidence: 99%

Elastomer solubility and stress relaxation in bio-lubricants

Carrell

Lewis

Slatter

2020

Tribology International

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This study presents novel results from in-situ stress relaxation tests using rubber O-ring seals immersed in bio-lubricant base oils (jojoba, soybean and palm oil), with a mineral base oil used for comparison. Little information is available on the interaction of bi-lubricants and elastomers. The use of Hanson Solubility Parameter modelling methods was considered for assessing compatibility. Some correlation was found between experimental results for EPDM. Results were inconclusive for NBR and FKM. EPDM immersed in palm and soybean oil suffered minor shrinkage, caused by stress relaxation. Swelling occurred with EPDM immersed in jojoba and mineral base oil, caused by diffusion. Results for nitrile showed shrinkage for all oils. Less than 1% change in mass occurred for all oils and FKM.

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“…The normal loading device (480 × 480 × 20 mm) connected to the hydraulic jack provided the normal load F N to the fracture containing high-strength springs (Figure 2(b)). Meanwhile, the grouting pipes (5 mm in internal diameter and 9 mm in length) passing through the rectangular holes belonging to another loading device providing tangential force were inserted into the fracture and tightly sealed by using CR4305 chloroprene rubber [32][33][34] which ensured the sealing effect of the fracture and prevented the grout overflowing from the entrance of the fracture (Figure 4 Figure 4(c)) were placed on the platform, and the horizontal and vertical loads were applied to the fractured sample boundaries.…”

Section: A Platform For Grout Flow Through Fractured Rockmentioning

confidence: 99%

Cement Grout Nonlinear Flow Behavior through the Rough-Walled Fractures: An Experimental Study

Jin

Han

et al. 2020

Geofluids

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This research experimentally studied the effects of various fracture roughness (characterized by the fractal dimension D) and normal stress (normal loads FN) applied to fracture on ultrafine cement grout nonlinear flow behavior through rough-walled plexiglass fractured sample. A high-precision and effective sealing self-made apparatus was developed to perform the stress-dependent grout flow tests on the plexiglass sample containing rough-walled fracture (fracture apertures of arbitrary variation were created by high-strength springs and normal loads according to design requirements). The real-time data acquisition equipment and high-precision self-made electronic balance were developed to collect the real-time grouting pressure P and volumetric flow rate Q, respectively. At each D, the grouting pressure P ranged from 0 to 0.9 MPa, and the normal loads FN varied from 1124.3 to 1467.8 N. The experimental results show that (i) the Forchheimer equation was fitted very well to the results of grout nonlinear flow through rough-walled fractures. Besides, both nonlinear coefficient (a) and linear coefficient (b) in Forchheimer’s equation increased with increase of D and FN, and the larger the FN was, the larger the amplitude was. (ii) For normalized transmissivity, with the increase of Re, the decline of the T/T0−β curves mainly went through three stages: viscous regime, weak inertia regime, and finally strong inertia regime. For a certain D, as the normal load FN increased, the T/T0−β curves generally shifted downward, which shows good agreement with the single-phase flow test results conducted by Zimmerman. Moreover, with the increase of D, the Forchheimer coefficient β decreased. However, within smaller FN, β decreased gradually with increasing D and eventually approached constant values. (iii) At a given FN, Jc increased with increasing D.

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Compatibility study of common sealing elastomers with a biolubricant (Jatropha oil)

Cited by 25 publications

References 22 publications

Effects of Jatropha lubricant thermo-oxidation on the tribological behaviour of engine cylinder liners as measured by a reciprocating friction test

Effects of Jatropha lubricant thermo-oxidation on the tribological behaviour of engine cylinder liners as measured by a reciprocating friction test

Elastomer solubility and stress relaxation in bio-lubricants

Cement Grout Nonlinear Flow Behavior through the Rough-Walled Fractures: An Experimental Study

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