Zastosowanie techniki DWS i spektroskopii Ramana do oceny emulsji parafinowych formowanych metodą homogenizacji

Drabik, J.; Kozdrach, R.; Wrona, M.; Iłowska, Jolanta

doi:10.15199/62.2017.12.31

Cited by 6 publications

(5 citation statements)

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“…The study of the rheological properties of the lubricant mixture investigated was carried out using a DWS RheoLab instrument, an optical rheometer manufactured by the Swiss company LS Instruments AG (Fribourg, Switzerland). This instrument uses diffusing wave spectroscopy (DWS) to measure the rheological behaviour of materials, both solid and liquid, such as suspensions, dispersions, slurries, and oils [ 13 , 47 , 83 , 84 ]. The operating principle of the diffuse spectrometer is based on the idea that light propagation in optically opaque samples can be considered as a diffusion phenomenon.…”

Section: Methodsmentioning

confidence: 99%

Influence of Silicon Additives on Tribological and Rheological Test Results for Vegetable Lubricants

Kozdrach,

Drabik,

Szczerek

2023

Materials

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This paper describes an investigation of the effects of silicone-containing additives on the tribological and rheological properties of various lubricant blends. Aerosil® and layered silicate were used to modify lubricants containing rapeseed, linseed and soy oil that were thickened with soap thickener. Tribological tests were carried out using a four-ball concentric contact tester. On the basis of the data obtained from the tribological studies of the selected lubricant blends, it was concluded that the addition of amorphous silica increased the anti-seizure and anti-wear properties of the tested lubricants. The addition of montmorillonite caused a significant increase in the values of the individual parameters determining the level of lubricating properties of the tested lubricants in comparison with the lubricants modified with the silica additive. Based on the results of the rheological tests of the studied lubricants, it was found that the applied additives caused a change in the dynamic viscosity and chemical structure of the tested lubricants, expressed by a change in the values of the G′ and G″ indices. The main finding of this manuscript was to demonstrate that the use of montmorillonite and aerosil additives improves the functional properties of vegetable-based plastic lubricants. The performance of tribological and rheological tests is of great scientific importance, as it provides an insight into the interaction of siliceous additives with the results of tribological tests on vegetable-oil-based greases. These findings make it possible to determine the behaviour of the lubricant under load and add to the knowledge of vegetable greases.

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Section: Methodsmentioning

confidence: 99%

Influence of Silicon Additives on Tribological and Rheological Test Results for Vegetable Lubricants

Kozdrach,

Drabik,

Szczerek

2023

Materials

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“…Abyssinian oil was used as a vegetable oil because it is an inedible oil and has very good physicochemical, tribological, and rheological properties. Modified amorphous silica was used as a dispersed phase (Drabik et al, 2017;Kozdrach, 2017Kozdrach, , 2018. As a modified additive, a substance containing antioxidants, corrosion inhibitors, and EP/AW additives (Brad Chem 351) was used.…”

Section: Materials and Research Methodologymentioning

confidence: 99%

The influence of base oil type on the rheological properties of ecological lubricating greases

Kozdrach¹

2021

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The article presents the results of research on the influence the type of base oil in lubricating compositions has on the rheological parameters of selected lubricants. Vegetable, mineral, and synthetic dispersion phases were used to produce lubricating greases. The modified amorphous silica was used as the dispersed phase. However, as a modifying additive was used a substance containing the antioxidants, corrosion inhibitors, and EP/AW additives. The experiments on rheological properties were carried out using a Physica MCR 101 rotational rheometer (manufactured by Anton Paar), equipped with a diffusion air bearing and connected to a pneumatic supply – an oil-free Jun-Air compressor and air drying block. The device is equipped with a Peltier system for temperature control in the range of –20°C to 200°C and an external thermostatic VISCOTHERM V2 system, working in the temperature range of –20°C to 200°C. The rheometer control and measurement data analysis were performed using Rheoplus software. The tests were carried out using a cone-plate measuring system with a shear rate range of 0.01–100 s-1 at 20°C for lubricating compositions prepared on various oil bases. To evaluate the value of rheological parameters, the results of tests of the dependence between shear stress and shear rate (flow curves) were used. For the theoretical determined on the flow curves, the following rheological models were used: Bingham, Herschel–Bulkley, Casson, and Tscheuschner. The values of the shear stress (yield point) in depending on the type of dispersion phase has changed. This proves that the use of a base oil with the appropriate functional properties does not weaken, but reinforces the spatial structure of a lubricating grease. It has an important meaning when selecting construction parameters when designing a central lubrication system with grease made from a vegetable oil base (Abyssinian oil). The rheological properties of the lubricating grease are influenced by the type of base oil and thickener, any additives in the grease, the production technology of the grease, and the conditions in which it is used. The tests revealed an important influence of the base oil on the rheological parameters that describe the behaviour of lubricating compositions subjected to stresses and strains in a lubricating system.

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“…During the rheological tests, the correlation function of the MSD (mean square displacement) from the time of delay, the storage module G', the loss module G" in static conditions were determined, depending on the frequency. Rheological measurements were carried out at the temperature of 20 o C. Based on the analysis of the determined rheological parameters, the change in viscoelastic properties of the investigated lubricating compositions was determined [38][39][40]48,50].…”

Section: Materials and Methodology Of Studiesmentioning

confidence: 99%

The tribological properties of lubricating greases produced on vegetable base and modified of polytetrafluoroethylene

Kozdrach

2020

Finnish J. Trib.

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The article presents the results of research on the influence of polytetrafluoroethylene additive on the tribological and rheological properties of selected lubricant compositions. Based on the obtained test results, it was found that the introduction of a modifying additive to the lubricant structure allows a significant reduction of the coefficient of friction, thus increasing the efficiency of tribological protection of the tribosystem. All lubricating compositions modified with at least 1% polytetrafluoroethylene guarantee effective anti-wear protection under load conditions of the tribosystem. Modification of the tested lubricating compositions with the applied additive affects the increase of indicators characterizing the fatigue life of the examined lubricating greases based on sunflower oil. The introduction of the polytetrafluoroethylene into the structure of the tested lubricants changed the values of the MSD correlation function and the G’ and G’’ modules, which significantly influenced the internal structure of the tested lubricant compositions.

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Zastosowanie techniki DWS i spektroskopii Ramana do oceny emulsji parafinowych formowanych metodą homogenizacji

Cited by 6 publications

References 0 publications

Influence of Silicon Additives on Tribological and Rheological Test Results for Vegetable Lubricants

Influence of Silicon Additives on Tribological and Rheological Test Results for Vegetable Lubricants

The influence of base oil type on the rheological properties of ecological lubricating greases

The tribological properties of lubricating greases produced on vegetable base and modified of polytetrafluoroethylene

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