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A new type of lubricating material (BTA-P4444-Lig) was synthesized by combining lignin with tetrabutylphosphorus and benzotriazole. The tribological properties, corrosion resistance, and anti-oxidation properties of BTA-P4444-Lig as a lubricant were investigated. The lubricating material exhibits excellent friction reduction and wear resistance, as well as good thermal stability and excellent oxidation resistance. Mechanistic analysis reveals that the active elements N and P in the lubricating material react with the metal substrate, and the reaction film effectively blocks direct contact between the friction pairs, affording excellent friction reduction and wear resistance. At the same time, the phenolic hydroxyl group in lignin reacts with oxygen free radicals to form a resonance-stable semi-quinone free radical, which interrupts the chain reaction and affords good anti-oxidant activity.


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Lignin composite ionic liquid lubricants with excellent anti-corrosion, anti-oxidation, and tribological properties

Show Author's information Chaoyang ZHANG1,Zhiquan YANG1,Qing HUANG2Xingwei WANG3Wufang YANG1,3,4Chunyu ZHOU4Bo YU1,3,4Qiangliang YU1,3,4( )Meirong CAI1,3,4( )Feng ZHOU1
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
PetroChina Lanzhou Lubricating Oil R&D Institute, Lanzhou 730060, China
Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing, Yantai 264006, China
Yantai Zhongke Research Institute of Advanced Materials and Green Chemical Engineering, Yantai 264006, China

† Chaoyang ZHANG and Zhiquan YANG contributed equally to this work.

Abstract

A new type of lubricating material (BTA-P4444-Lig) was synthesized by combining lignin with tetrabutylphosphorus and benzotriazole. The tribological properties, corrosion resistance, and anti-oxidation properties of BTA-P4444-Lig as a lubricant were investigated. The lubricating material exhibits excellent friction reduction and wear resistance, as well as good thermal stability and excellent oxidation resistance. Mechanistic analysis reveals that the active elements N and P in the lubricating material react with the metal substrate, and the reaction film effectively blocks direct contact between the friction pairs, affording excellent friction reduction and wear resistance. At the same time, the phenolic hydroxyl group in lignin reacts with oxygen free radicals to form a resonance-stable semi-quinone free radical, which interrupts the chain reaction and affords good anti-oxidant activity.

Keywords: lubrication, ionic liquid, lignin, anti-oxidant

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Publication history

Received: 03 January 2022
Revised: 24 March 2022
Accepted: 23 May 2022
Published: 28 July 2022
Issue date: July 2023

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© The author(s) 2022.

Acknowledgements

The authors acknowledge financial support from the National Key R&D Program of China (2021YFA0716304), the National Natural Science Foundation of China (52075524, 21972153, and U21A20280), the Youth Innovation Promotion Association of CAS (2022429 and 2018454), Gansu Province Science and Technology Plan (20JR10RA060 and 20JR10RA048), and LICP Cooperation Foundation for Young Scholars (HZJJ21-06).

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