Impact of Water on the Rheology of Lubricating Greases


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Process Temperature Profile and Rheological Properties of ....

Greases are composed by lubricating oil dispersed in a thickener that can be a metal soap, polymers or clays. ... proposing rules to reduce the environmental impact of vessels and boats circulation by obliging them to use ... Process Temperature Profile and Rheological Properties of Greases from Vegetable Oils ...

Influence of soap/polymer concentration ratio on the ....

The combined effect that both soap and LDPE concentrations exerts on the rheology of lithium lubricating greases and its relationship with grease microstructure were studied according to an experimental design based on the response surface methodology (RSM).

The Application of Polyvinylpyrrolidone as a Modifier of ....

The paper presents the research results on the relations between additive content and tribological, rheological, and oxidizing properties of lubricating greases. The greases were based on linseed oil, thickened with amorphous silica Aerosil ® and modified with different concentration of polyvinylpyrrolidone. The greases were tested ...

Impact of Water on the Rheology of Lubricating Greases ....

The possible ingress of water into the bearing will have a considerable impact not only on this consistency but also on the lubricating ability of the grease. There are numerous applications where water ingress may occur, such as in the steel, food, pulp, and paper industries. Some greases are less sensitive to water than others.

Influence of Soap Concentration and Oil Viscosity on the ....

The effects that both soap concentration and base oil viscosity exert on the rheology of lubricating greases and its relationship with grease microstructure are discussed in this work. With this aim, different lubricating grease formulations were manufactured by modifying the concentration of lithium 12-hydroxystearate and the viscosity of the base oil, according to an RSM statistical design.

(PDF) Impact of Water on the Rheology of Lubricating Greas...

Impact of Water on the Rheology of Lubricating Greases F. Cyriac 1, 2 , a , P.M. Lugt 2, 3 , R. Bosman 2 1 Materials innovation institute (M2i), 2628 XG, Delft, The Netherlands

Rob Bosman – Research Output — University of Twente ....

A Master Curve for the Shear Degradation of Lubricating Greases with a Fibrous Structure Zhou, Y., Bosman, R. & Lugt, P. M. , 2 Jan 2019 , In : Tribology transactions. 62 , 1 , p. 78-87 10 p. Research output : Contribution to journal › Article › Academic › peer-review

Lubricants | Special Issue : Lubricating Greas...

Lubricating greases are colloid disperse systems consisting of a base oil and a thickener (additional additives). The lubricant is modeled as a tribological system, and the reaction of a fluid friction stress is investigated. The energetic situation of the volume element is analyzed and the system entropy described.

Assessment of the effect of temperature, shear rate and ....

As part of this research the thixotropy of lubricating greases based on mineral oil ORLEN OIL SN-400, thickened with lithium 12-hydroxystearate has been investigated. The investigations consisted in shearing grease samples in the rotational rheometer head for 1 h, followed by 24- h relaxation and again 1-h shearing, at a constant shear rate gradient.

Greases Impact of Water on the Rheology of Lubricati...

ACCEPTED MANUSCRIPT 1 ACCEPTED MANUSCRIPT Impact of Water on the Rheology of Lubricating Greases F. Cyriac 1, 2, a, P.M. Lugt 2, 3, R. Bosman 2 1Materials innovation institute (M2i), 2628 XG ...

Lubricants | Special Issue : Lubricating Greases 20...

Dear Colleagues, This Special Issue came as the natural consequence of the great success of the previous Special Issue “Lubricating Greases”. Although lubricating greases are widely used in many specific applications, their market only constitutes a very low percent of the total amount of lubricants processed in the world.

Impact of Water on EHL Film Thickness of Lubricating ....

Although grease can absorb large quantities of water, separation occurs due to pressure and shear, leading to free water. This does not have an impact on the film thickness under fully flooded conditions. However, water does have an effect on the film thickness under starved conditions where the differences are related to the change in oil bleed.

Effect of thermo-mechanical processing on the rheology of ....

Effect of thermo-mechanical processing on the rheology of oleogels potentially applicable as biodegradable lubricating greases ... one of the main problems of very different industrial sectors concerns the impact that process technologies and products cause in the environment. ... The Rheology of Lubricating Greases, ELGI, Amsterdam, The ...

Study of microstructural transformation of overbased ....

Study of microstructural transformation of overbased calcium sulphonates during friction ... R. Bosman, C. H. Venner, Impact of Water on EHL Film Thickness of Lubricating Greases in Rolling Point Contacts, Tribology ... 3 F. Cyriac, P. M. Lugt, R. Bosman, Impact of Water on the Rheology of Lubricating Greases, Tribology Transactions, 2016 ...

The Impact of Water on the Yield Stress and Startup Torque ....

Water was found to influence the yield stress and startup torque depending on the operating temperature, grease type, and percentage water in the grease. The Impact of Water on the Yield Stress and Startup Torque of Lubricating Greases: Tribology Transactions: Vol 60, No 5

Influence of Soap Concentration and Oil Viscosity on the ....

The effects that both soap concentration and base oil viscosity exert on the rheology of lubricating greases and its relationship with grease microstructure are discussed in this work. With this aim, different lubricating grease formulations were manufactured by modifying the concentration of lithium 12-hydroxystearate and the viscosity of the base oil, according to an RSM statistical design.

Modern advancements in lubricating grease technology ....

Modern advancements in lubricating grease technology Modern advancements in lubricating grease technology Lugt, Piet M. 2016-05-01 00:00:00 Grease is one of the major bearing components and the performance of a grease lubricated bearing is strongly determined by the performance of the grease. This paper describes how grease knowledge is linked to improved rolling bearing performance.

Impact of Water on EHL Film Thickness of Lubricating ....

In an earlier paper, the authors [1] studied the impact of water on the rheology of lubricating greases. The model greases represented the most commonly used thickener–oil systems that are used in rolling bearings. The same greases & F. Cyriac [email protected] 1 Materials Innovation Institute (M2i), 2600 GA Delft, The Netherlands

Impact of Water on the Rheology of Lubricating Greases ....

title = "Impact of Water on the Rheology of Lubricating Greases", abstract = "The operational life of bearings is often determined by the performance of the lubricating grease. The consistency of the grease prevents it from leaking out of the bearing and provides good sealing properties.

Rheology of lubricating greases modified with reactive NCO ....

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Study of microstructural transformation of overbased ....

Moreover, the effects of pressure and the presence of water were studied. The pressure contributes neither to an increase in particle size nor to a crystallisation phenomenon. However, the presence of water in the additive oil alters the interactions between the micelles.