Synthesis of Castor Oil-based Bifunctional Lubricant Additive

IF 1.3 4区工程技术 Q3 CHEMISTRY, ORGANIC

Petroleum Chemistry Pub Date : 2025-02-18 DOI:10.1134/S0965544123600418

Liqin Ding, Xinyi Liu, Sifan Liu, Yuntao Xi, Xiao Guo, Hanbin Zhong

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Abstract

Poly(castor oil(CO)–styrene(St)) (PCOS) was synthesized in toluene with azodiisobutyronitrile (AIBN) as the initiator using a Schlenk technology. The structure of PCOS was characterized by the Fourier transform infrared spectroscopy (FT-IR), Proton nuclear magnetic resonance (¹H NMR), and gel permeation chromatography (GPC), and the performance of the synthesized copolymer was evaluated as a solidification point depressant and a viscosity index improver. Experimental results show that when the optimum process conditions are m(CO) : m(St) = 1 : 1, and the AIBN mass fraction is 0.4% (based on the total mass of monomers) at 90°C for 6 h, the copolymer yield is 41%, the average relative molecular mass is 3.1 × 10⁴, and the polydispersity index is 2.9. After addition of the synthesized copolymer, the solidification point of the lubricant fraction (350–395°C) can be decreased by 6–12°C, while the viscosity index can increase by 24–39. Therefore, the synthesized copolymer could be used as a lubricant additive with the double functions of reducing the solidification point and increasing the viscosity index.

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蓖麻油基双功能润滑油添加剂的合成

以偶氮二异丁腈（AIBN）为引发剂，采用Schlenk技术在甲苯中合成了聚蓖麻油(CO) -苯乙烯（St）（PCOS）。采用傅里叶变换红外光谱（FT-IR）、质子核磁共振（1H NMR）和凝胶渗透色谱（GPC）对PCOS的结构进行了表征，并对合成的共聚物作为凝固点抑制剂和粘度指数改善剂的性能进行了评价。实验结果表明，当最佳工艺条件为m(CO): m(St) = 1:1， AIBN质量分数为0.4%（以单体总质量为基准），90℃反应6 h时，共聚物收率为41%，平均相对分子质量为3.1 × 104，多分散性指数为2.9。合成共聚物加入后，润滑油馏分（350 ~ 395℃）凝固点可降低6 ~ 12℃，粘度指数可提高24 ~ 39℃。因此，合成的共聚物可作为润滑剂添加剂，具有降低凝固点和提高粘度指数的双重功能。

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来源期刊

Petroleum Chemistry 工程技术-工程：化工

CiteScore

2.50

自引率

21.40%

发文量

102

审稿时长

6-12 weeks

期刊介绍： Petroleum Chemistry (Neftekhimiya), founded in 1961, offers original papers on and reviews of theoretical and experimental studies concerned with current problems of petroleum chemistry and processing such as chemical composition of crude oils and natural gas liquids; petroleum refining (cracking, hydrocracking, and catalytic reforming); catalysts for petrochemical processes (hydrogenation, isomerization, oxidation, hydroformylation, etc.); activation and catalytic transformation of hydrocarbons and other components of petroleum, natural gas, and other complex organic mixtures; new petrochemicals including lubricants and additives; environmental problems; and information on scientific meetings relevant to these areas. Petroleum Chemistry publishes articles on these topics from members of the scientific community of the former Soviet Union.