Polymers
·
2024
·Vol. 16
·期 19
·2828
·
IF 4.7
Qidi Hu,Kai Zeng,Sheng Han,Jian Xu,Wenjing Hu,Jiusheng Li
Anti-wear and anti-oxidation abilities are two key properties of lubricants that play a crucial role in ensuring long-term stable equipment operation. In this study, we aimed to develop a base oil with good anti-oxidation and anti-wear properties for use under extreme pressure. The as-prepared metallocene polyalphaolefin (mPAO) was chemically modified using the trifluoromethanesulfonic acid (TfOH) catalysis through an alkylating reaction with triphenyl phosphorothioate (TPPT). During the experiments, when the reaction temperature exceeded 70 °C or the concentration of TfOH exceeded 2.67%, theβ-scission reaction in the alkylation process became significantly more pronounced. The physical and chemical properties of TPPT-modified mPAO (T-mPAO) were evaluated by nuclear magnetic resonance spectroscopy, Fourier trans-form infrared spectroscopy, gel–permeation chromatography, and ASTM standards. T-mPAO showed significantly improved antioxidant capacity, with the initial oxidation temperature increasing by 32 °C compared to the base oil, and it exhibited the slowest increase in acid number in the 96-h oven oxidation test. The tribological tests showed that T-mPAO had the lowest friction coefficient, wear track, and wear rate (72.7% lower than that of mPAO) as well as the highest PB(238 kg) and PD(250 kg) among all tested samples. Compared to mPAO, the average friction coefficient of TPPT-modified mPAO in the four-ball friction test was reduced by 30.5%, and by 16.4% in the TE77 reciprocating friction test. Based on the experimental results, T-mPAO had strong anti-oxidation ability and excellent lubricating performance.The successful synthesis of multifunctional mPAO has enabled lubricant base oil additization, making it possible to use it in more demanding work scenarios, greatly broadening its application scope and making lubricant formulation blending more flexible.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Coatings
·
2024
·Vol. 14
·期 12
·1572
·
IF 2.9
Yuqin Zhu,Jia Liu,Liang Li,Weikang Sun,Wei Tang,Lei Wang
To improve lubricant performance and extend the service life of machinery, the friction reduction and anti-wear performance of nano-cerium oxide (nano-CeO2) and nitrogen-containing heterocyclic borate (BNH2) composite additives were studied in this work, with the goal of obtaining better lubrication effects than a single additive. The results showed that the nano-CeO2modified with Span80 had good dispersion stability in the base oil. The optimal addition mass fractions of single nano-CeO2and BNH2 were 0.6 wt% and 1.0 wt%, respectively. Compared with the base oil, 0.6 wt% nano-CeO2reduced the coefficient of friction by 44.9% and the wear spot diameter by 27.8%, while 1.0 wt% BNH2 reduced the coefficient of friction by 49.1% and the wear spot diameter by 32.8%. Compared with the single additions of nano-CeO2and BNH2, the compound nano-CeO2/BNH2 further improved the friction reduction and anti-wear performance of the lubricating oil. Compared with the base oil, the 0.8 wt% nano-CeO2/1.0 wt% BNH2 composite additive reduced the coefficient of friction by 55.9% and the diameter of the abrasive spot by 48%. Physicochemical analysis of the wear surface revealed that the combination of nano-CeO2and BNH2 had excellent synergistic effects. The generated lubricant films of nano-CeO2/BNH2 contained a chemical reactive layer of organic nitride (C–N), Fe2O3, FeO, and B2O3and a physical adsorbent layer of CeO2that provided great friction reduction and anti-wear effects during friction.
研究领域:
材料科学
·
机械工程
·
表面工程
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Siwei Chen,Qingqing Chen,Baogang Wang,Hongsheng Lu
The application of carbon dots (CDs) as lubricant additives of nonpolar oils such as poly-α-olefins (PAOs) has been greatly hindered because most of CDs derived from the bottom-up method were water-soluble. In this work, the oil-soluble polymer brushes grafted CDs were synthesized by the surface-initiated atom transfer radical polymerization of bis-alkyl chain monomers. As expected, the polymer grafted CDs exhibited the excellent long-term dispersion stability in PAO owing to the principle of similar compatibility. As the lubricant additives of PAO4, the CDs showed the best friction-reducing and anti-wear properties when the polymerization time was 2 h. Adding 1 wt% of CDs could make the coefficient of friction and wear volume of PAO4 reduce by 64.1 % and 49.6 %, respectively. Moreover, both the tribological properties and anti-rust performance of CDs were superior to the commercially used ZDDP. The distinguished friction-reducing and anti-wear properties of CDs were attributed to the synergistic lubrication of carbon cores and polymer brushes. The rolling, repairing and polishing action of carbon cores, together with the tribo-reactions of polymer brushes, resulted in the formation of tough lubricating films on the rubbing surfaces, thereby tremendously alleviating the friction and wear of tribopair. The impressive anti-rust performance of CDs could be assigned to their strong adsorption ability on metallic surfaces. The above results are hopeful to provide useful information for the design and development of efficient multifunctional additives such as polymer-grafted metallic or inorganic nanomaterials.
研究领域:
材料科学
·
润滑工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yue Liu,Meng Cai,ZhiHui Xie,Liangliang Xiong,Xiaoqiang Fan,Minhao Zhu
Graphene Oxide (GO) nanosheets show great potential in the field of corrosion protection owing to their lamellar structure and remarkable mechanical features. However, these nanosheets are highly susceptible to agglomerating in waterborne epoxy resin (EP) matrix, which results in their structure degradation and restricts their application in anti-corrosion field. To address this challenge, a novel approach is employed in this study, involving the synthesis of multiple molecular chains (PEI and EDTA) grafted GO nanosheets (designated as EAGO), and subsequently chelated with cerium cations (CEAGO). The grafting of multiple molecular chains solves the agglomeration phenomenon of GO nanosheets during the coating preparation process. Such an advanced structural design is crucial for corrosion protective coatings since the unique structure of grafted EDTA enables effective chelating of corrosion inhibitors to provide anti-corrosion and self-healing features, while the steric hindrance effect of multiple molecular chains restricts the mobility of EP molecular chains, thereby enhancing anti-wear properties. The CEAGO/EP coating achieves a corrosion protection efficiency of up to 96.53%, and the wear rate of the CEAGO/EP coating is approximately 62.88% lower than that of pure EP. Electrochemical Impedance Spectroscopy (EIS) and White-light interferometer (WLI) results demonstrated that the epoxy coating loaded with CEAGO nanosheets could provide robust corrosion protection and wear resistance for 6082 aluminum alloy.
研究领域:
材料科学
·
腐蚀与防护
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表面工程
✓ 已验证
产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2016
·
IF 2.259
Lili Zhu,Gaiqing Zhao,Xiaobo Wang
In this study, three oil-soluble phosphonium-based ionic liquids (ILs) were synthesized and then investigated them as potential lubricating additives. The friction-reduction and antiwear performances of the ILs as lubricant additives in pentaerythritol oleate (PETO) and trimethylolpropane trioleate (TMPTO) were evaluated on an Optimol SRV-IV oscillating reciprocating friction and wear tester. The results indicated that tetradecyltrihexylphosphonium O,O′-diethyldithiophosphate (IL3=TTP−DDP) exhibited considerably better lubrication properties than commercially available tricresyl phosphate (TCP) by performing very well at 200 °C. SEM and XPS were performed to analyze the worn surfaces and revealed the fabrication of tribofilm composed of Fe(OH)O, Fe 3 O 4 , FePO 4 and FeSO 4 , which played a crucial role in the excellent lubricating behaviours of the ILs-additived lubricants.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Lubricants
·
2018
·Vol. 6
·期 3
·63
·
IF 0
Yingjing Dai,Hong Xu,Jinxiang Dong
Vegetable oil has significant potential as a base oil, and substitute for mineral oil in grease formulation due to its biodegradability, low toxicity and excellent lubrication. This paper studied the development of vegetable oil-based greases with α-Zr(HPO4)2·H2O (α-ZrP) as an additive, exploring base oil influence in tribological behavior. The results demonstrated that the addition of α-ZrP in vegetable-based greases is beneficial to anti-wear property. α-ZrP particles exhibit good performance in anti-wear, friction-reduction and load-carrying capacity, and its tribological performances are better than the normally used molybdenum disulfide and graphite additives. Owing to its superior tribological properties as a vegetable oil-based grease additive, α-ZrP holds great potential for use in environmentally friendly applications in the future.Keywords:anti-wear additive;α-Zr(HPO4)·H2O;vegetable oil;anhydrous calcium grease
研究领域:
材料科学
·
润滑工程
✓ 已验证
产品关联
DOI
Science China-Technological Sciences
·
2024
·
IF 4.4
Niu WenXing,Zhao XinRui,Yuan Min,Hou ZhiGuo,Liu Lei,Xu Hong,Dong JinXiang
We studied different long-chain ammonium ions intercalated zirconium phosphate α-ZrP, methylamine intercalated ZrP (MA-ZrP), tetramethylammonium hydroxide intercalated ZrP (TMAH-ZrP), dodecyltrimethylammonium bromide intercalated ZrP (DTAB-ZrP), and stearyl trimethyl ammonium bromide intercalated ZrP (STAB-ZrP) as grease co-additives in combination with isobutylene sulfide (SIB). The grease with co-additives displayed excellent extreme-pressure and anti-wear performance. Moreover, the combination of the longest chain ammonium ion intercalated zirconium phosphate, STAB-ZrP/SIB, had the best tribological properties. In comparison to α-ZrP, the advantage of STAB-ZrP was that it did not form a large area of the dense physical film like α-ZrP on the worn surface, but rather gave the SIB a chance to contact with the fresh metal surface to generate a chemical film. Therefore, the sub-micron physical film and nanoscale chemical film always exist side by side on the contact surface during the friction process. This intercalated α-ZrP/SIB additive has great potential for use in harsh operating conditions.
研究领域:
材料科学
·
摩擦学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2018
·
IF 3.246
Mengting Ye,Tao Cai,Wangji Shang,Lina Zhao,Yunxiao Zhang,Dan Liu,Shenggao Liu
Inorganic–organic hybrid carbon quantum dots (CQDs) attached the structure of diphenylamine (DPA) on the surfaces (CQDs -N ) have been successfully prepared by one-step pyrolysis method at lower temperature. The obtained N-doped carbon dots (CQDs -N ) were spherical particles with a narrow size distribution exhibiting photoluminescent property, which are also proved to be an multifunctional additive exhibiting not only antioxidant but also antiwear and friction-reducing performances. Even tested under higher load, CQDs -N still exhibited superior friction-reducing performance till now in polyethylene glycol (PEG) for steel/steel pairs. The function of CQDs -N with polar nature, acting as bearing balls and depositing on the interface to form non-uniform protective film, might account for the excellent antiwear and friction-reducing performances under boundary lubrication .
研究领域:
材料科学
·
摩擦学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
PETROLEUM SCIENCE AND TECHNOLOGY
·
2023
·
IF 1.5
Jue Wang,Heng Zhang,Wei Wu,Zeyun Wang
Use of the synergistic effect between nanomaterials and ionic liquids is of great significance for designing high-performance lubricating materials. In this work, Zn-MOF/[P88814]DEHP (zinc complexes with 2-aminoterephthalic acid nanosheets/trioctyltetradecylphosphonium bis (2-ethylhexyl) phosphate) composites were successfully synthesized by grinding the mixture of [P88814]DEHP and Zn-MOF with different mass ratios and evaluated as a new kind of the white oil additive using a four-ball testing machine. Results demonstrate that the optimal mass ratio of Zn-MOF to [P88814]DEHP was 1:1 and the Zn-MOF/[P88814]DEHP composite with 2.0 wt% addition amount into the white oil significantly reduced friction coefficient and wear. Such obvious friction-reducing and outstanding anti-wear properties of Zn-MOF/[P88814]DEHP composite could be attributed to the synergistic lubrication between Zn-MOF and [P88814]DEHP. This work investigated the synergistic lubrication between MOFs and ILs, which provided a new idea for designing and preparing new lubricating oil additives.
研究领域:
材料科学
·
润滑工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Jiahe Wang,Qunfeng Zeng,Haolin Li,Zeming Pang,Wanjun He,Jiansen Hao
Aircraft engines are subject to salt spray erosion in marine environments, and the protection of bearings faces a dual challenge of anti-wear and anti-corrosion. This paper was inspired by mussels and prepared a polydopamine nano-SiO 2 modified stearic acid composite organic coating on the surface of bearing steel by in-situ polymerization. The results indicate that the composite coating has excellent corrosion resistance in seawater, reducing the current density from 3.87 × 10 −5 A/cm 2 to 2.13 × 10 −7 A/cm 2 . The biomimetic microstructure effectively enhances the hydrophobicity of the coating, increasing the contact angle from 76.84° to 145.1°. The composite coating exhibits plastic deformation under high stress conditions of 17.55 GPa, with a stable friction coefficient between 0.11 and 0.12. According to first principles calculations, polydopamine as an intermediate layer increases the minimum interfacial energy from 14.11 kJ/mol to 23.96 kJ/mol. This polymer dopamine nano-SiO 2 modified stearic acid composite organic coating is expected to be used in moving parts such as aircraft bearings to reduce corrosion and wear, and extend service life.
研究领域:
材料科学
·
仿生学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2020
·Vol. 13
·期 1
·191
·
IF 3.057
Ya’e Qi,Ling Zhang,Yongxia Wang
Ionic liquid (IL) combined with 2D materials has evoked considerable attention in the field of lubrication applications because of their speical structure and outstanding lubrication properties. However, the ambiguous effect of the 2D materials on the friction and anti-wear properties of the IL needs futher study. Here, we have obtained two families of IL composite films with additives of MoS2and graphene via a combined process of spin-coated and curing, and the distinction of the effects of two additives on the tribological performance of the IL films was studied. The friction tests showed that the friction coefficient and anti-wear life of the IL films were greatly enhanced after the addition of MoS2or graphene, which could be attributed to the improved load-carrying capacity and the second lubrication phase. Under a low addition content, graphene had more advantages to reduce the friction of the films, and MoS2was more beneficial to the tribological properties with the additional content increased. The films with low friction and good anti-wear properties may be valuable for the rational design of lubrication films for the practical engineering applications.Keywords:ionic liquid film;MoS2nanosheet;graphene;friction;anti-wear
研究领域:
材料科学
·
润滑工程
✓ 已验证
DOI
PubMed
高影响因子
ACS Omega
·
2021
·
IF 3.512
Chenghong Hu,Jia Ai,Lin Ma,Ping Wen,Mingjin Fan,Feng Zhou,Weimin Liu
The work reports on the physicochemical and tribological properties of gallate ester oils prepared from fully renewable resources, such as gallic acid and fatty acids. The ester structures were identified by proton nuclear magnetic resonance spectroscopy (1H NMR), carbon nuclear magnetic resonance spectroscopy (13C NMR) and high-resolution mass spectra (HRMS) data. The density at 20 °C (d20), kinematic viscosity (KV), viscosity index (VI), pour point (PP), flash point (FP), thermal and oxidative stabilities, friction-reducing and antiwear properties of gallate ester oils were evaluated. The tribological properties of gallate ester oils as lubricants for steel, copper, and aluminum tribo-pairs can be compared with those of the commercially available lubricating oil tris(2-ethylhexyl) trimellitate (Phe–3Ci8), but their viscosity-temperature characteristics, thermal and oxidative stabilities are better than those of Phe–3Ci8. More importantly, they have much higher biodegradabilities than Phe–3Ci8. The study of the lubrication mechanism shows that the physical and/or chemical adsorption film formed by gallate ester molecules between friction pairs is the key factor for them to obtain friction-reducing and antiwear properties.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）