Design, Synthesis and Tribological Properties of Fatty Acid Diethanolamide Borate Esters with Different Carbon Chain Lengths

IF 2.9 3区 工程技术 Q2 ENGINEERING, CHEMICAL Tribology Letters Pub Date : 2024-12-19 DOI:10.1007/s11249-024-01951-4
Xi Yang, Guangbin Yang, Shengmao Zhang, Yujuan Zhang, Shuguang Fan, Zhengquan Jiang, Laigui Yu, Pingyu Zhang
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Abstract

With the increasing attention to environmental issues and the improvement of environmental regulations, traditional lubricant additives are facing huge challenges, while biodegradable green lubricant additives are facing new opportunities. Organic borate esters, as lubricating additives, have core competitiveness over traditional lubricating additives containing S, P, and Cl. Borate esters not only overcome the poor corrosion resistance of traditional additives, but also have excellent load-bearing capacity and extreme pressure performance. In addition, introducing fatty acid diethanolamide containing active groups such as hydroxyl and amide bonds into borate esters enhances the adsorption capacity. In this article, three borate esters with different carbon chain length were prepared, namely stearic acid diethanolamide borate ester with a chain length of 18, tetradecanoic acid diethanolamide borate ester with a chain length of 14, and octanoic acid diethanolamide borate ester with a chain length of 8. The as-prepared borate ester, especially C18ONB, exhibits excellent tribological properties as lubricant additives in poly (a-olefin) (PAO6), significantly improving the friction reducing and antiwear properties of the base oil. This is due to the weak polarity of C18ONB with long carbon chains, which exhibits good solubility in PAO6 with weaker polarity and forms thick multilayer viscoelastic adsorption film on the friction surface. In addition, the adsorption film undergoes tribochemical reactions during the rubbing process, generating a tribofilm containing excellent lubricants such as B2O3 and BN, which further plays a good role in reducing friction and antiwear.

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来源期刊
Tribology Letters
Tribology Letters 工程技术-工程:化工
CiteScore
5.30
自引率
9.40%
发文量
116
审稿时长
2.5 months
期刊介绍: Tribology Letters is devoted to the development of the science of tribology and its applications, particularly focusing on publishing high-quality papers at the forefront of tribological science and that address the fundamentals of friction, lubrication, wear, or adhesion. The journal facilitates communication and exchange of seminal ideas among thousands of practitioners who are engaged worldwide in the pursuit of tribology-based science and technology.
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