Tribological behavior of cellulose nanocrystal as an eco-friendly additive in lithium-based greases

Li, Jingwen; Lin, Ning; Du, Chen; Ge, Yue; Amann, Tobias; Feng, Hao; Yuan, Chengqing; Li, Ke

doi:10.1016/j.carbpol.2022.119478

Cited by 15 publications

(8 citation statements)

References 32 publications

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“…All three terms are also used to designate sustainable or renewable materials. [36][37][38][39][40][41][42] Among such materials, polyol greases are often described. [43] Polyol greases are normally prepared from fatty substrates which are modi ed into polyols and further modi ed into ether or ester materials.…”

Section: Introductionmentioning

confidence: 99%

Towards a sustainable waste to eco-friendly grease pathway: A biorefinery proposal for the silk and food industries

Coroliano,

Couto,

Péres

et al. 2024

Preprint

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The concerning related to climate change, sustainability and residue destination, as evidenced by the United Nation’s Sustainability Development Goals, fosters among others the biorefinery application development. Amidst such circular economy possibilities is the implementation of residual oil biorefineries, imbuing higher value into residues and resulting in eco-friendly products. One of the most abundant residual oils, with very low reusage ratio, is the waste cooking oil, a food industry residue. While other residual oil can be extracted from lipid rich silkworm pupae, a residue from the silk processing industry. Thereby, in this work we propose a biorefinery for the usage and modification of waste cooking oil and silkworm pupae oil into eco-friendly greases based on circular economy concepts. The silkworm pupae oil was modified through epoxidation and hydrolysis, yielding a dense polyol which was used in grease compositions without further modifications (common for this sort of materials). The prepared compositions were elaborated using partial saponification (simplifying the process), under two distinct methodologies, with LiOH and NaOH. The prepared greases were also compared against simple soybean oil and ricin oil greases to identify the polyol addition effect and the frying oil reusage effect. All the greases prepared using methodology B were stiffer with overall higher values for yield point (15.7-56.9 Pa) and flow point (259.2-810.95 Pa), while the thixotropic hysteresis area fluctuated with greater time dependency for polyol containing compositions (1.85-9.16 104 Pa s-1). The ion change from lithium to sodium using methodology A on polyol compositions resulted in diminished flow points (from 457.35 to 70.31 Pa). The same change on waste cooking oil, on methodology A, resulted in increased values of flow point (from 32.06 to 96.90 Pa). The addition of polyol effect resulted in flow point increase (from 259.2 to 810.95 Pa), while the frying oil reusage effect resulted in increased yield (from 1.19 to 2.02 Pa) and flow points (from 38.44 to 96.90 Pa). The obtained results are on par with other eco-friendly grease examples and therefore corroborate the proposed value enhancing of our tested residual oils. The main perspective for this biorefinery proposal is the usage of the two residual oils together into a blend composition, chaining the silk and the food industries and thereby resulting in a single biorefinery applicable to any machinery dependent industry.

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Section: Introductionmentioning

confidence: 99%

Towards a sustainable waste to eco-friendly grease pathway: A biorefinery proposal for the silk and food industries

Coroliano,

Couto,

Péres

et al. 2024

Preprint

View full text Add to dashboard Cite

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“…However, the development of oil-based lubricating materials is also limited owing to the non-renewal of mineral resources [24]. Despite many researchers being committed to environmentally friendly additives [25,26], the impact of oil-based lubricating materials on the environment is, ultimately, irreversible. As a result, green lubricants, which are nontoxic and environmentally friendly, have gained increasing attention in recent years [27].…”

Section: Introductionmentioning

confidence: 99%

Hydrogels for Lubrication: Synthesis, Properties, Mechanism, and Challenges

Hu,

Yang,

et al. 2024

Lubricants

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Hydrogels have received extensive attention as functional lubricants because of their excellent anti-friction and anti-wear properties, tunable tribological performances, and effectiveness in alleviating lubrication failures caused by the creeping or leakage of conventional liquid lubricants owing to their semi-solid nature. This review summarizes the current research advances in hydrogel lubricants fabricated with various organic and/or inorganic gelators, including organic polymeric or supramolecular hydrogels, inorganic particles-based hydrogels, and organic polymer-inorganic particle hybrid hydrogels. We illustrate not only the design strategies for constructing high-performance hydrogel lubricants but also the tribological behavior and mechanism of different types of hydrogel lubricants and their potential applications in industrial and biomimetic fields. Corresponding outlooks and suggestions for future studies have also been proposed.

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“…Highly crystalline nanocellulose has recently been studied as an additive to pristine lithium greases [24] and has been found to increase consistency and greatly improve the mending and protection of metal surfaces in mechanisms. The nanocellulose is expensive and implies a high processing cost to remove water from the grease (the nanocellulose being delivered and used in an aqueous suspension).…”

Section: Introductionmentioning

confidence: 99%

Lubricating Greases from Fried Vegetable Oil—Preparation and Characterization

Săpunaru,

Sterpu,

Vodounon

et al. 2024

Lubricants

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Biobased greases are derived from renewable resources, are considered more environmentally friendly, and offer comparable performance to petroleum-based greases. In this study, lubricating greases from frying cooking oils were prepared, thus valorizing waste in order to obtain sustainable and environmentally friendly products. Twelve batches (500 g each) were produced from sunflower and palm frying oils, with 20% by weight calcium/lithium stearate soaps prepared in situ and filled with 15 wt.% cellulose or lignin sulfate. The greases were rheologically characterized. Their consistency was assessed by the penetration test performed before and after working the greases. Dropping point determinations offered information about the stability at higher temperatures, and oil bleeding tests were performed. The average values of the friction coefficient (COF), the contact resistance, and the wear scar diameter were measured through mechanical tests. The greases prove to be comparable to those obtained from mineral oils, with good rheological properties, soft consistency, and good antiwearing behavior, e.g., in open or total-loss lubricating systems, like in open gears and certain food processing machinery; they are thermally stable andprone touse in low-loading working mechanisms.

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Tribological behavior of cellulose nanocrystal as an eco-friendly additive in lithium-based greases

Cited by 15 publications

References 32 publications

Towards a sustainable waste to eco-friendly grease pathway: A biorefinery proposal for the silk and food industries

Towards a sustainable waste to eco-friendly grease pathway: A biorefinery proposal for the silk and food industries

Hydrogels for Lubrication: Synthesis, Properties, Mechanism, and Challenges

Lubricating Greases from Fried Vegetable Oil—Preparation and Characterization

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