多己基萘/聚α-烯烃锂基润滑脂的流变学和摩擦学性能

doi:10.11949/0438-1157.20230173

摘要/Abstract

摘要：

离子液体（Et₃NHCl-AlCl₃）催化1-己烯和萘合成了多己基萘基础油，以聚α-烯烃（PAO8）基础油制备的锂基润滑脂作为参照，通过调节基础油中多己基萘与PAO8的复配比（10∶90、20∶80、30∶70和40∶60）制备了不同皂分含量的锂基润滑脂。对不同润滑脂样品的理化性能进行测试表征，利用流变仪和SRV-V摩擦磨损试验机系统地评价了加入的多己基萘对锂基润滑脂的流变学和摩擦学性能的影响，并借助3D白光干涉仪对钢盘磨损表面进行了分析。实验结果表明：基础油中多己基萘与PAO8复配质量比为20∶80时具有良好的协同效应，添加多己基萘可以显著提高PAO8基础油的稠化能力，节约稠化剂的用量，同时在较高温度（85℃）的工况下，多己基萘可以提高PAO8锂基润滑脂的流变和摩擦学性能。

关键词: 多己基萘, 基础油, 锂基润滑脂, 流变性能, 摩擦学性能

Abstract:

Poly-hexylnaphthalene base oil was synthesized with 1-hexene and naphthalene catalyzed by ionic liquid (Et₃NHCl-AlCl₃). Lithium grease prepared by poly-α-olefin (PAO8) base oil was used as reference. Lithium grease with different soap contents was prepared by adjusting the complex ratio of poly-hexylnaphthalene and PAO8 in the base oil (10∶90, 20∶80, 30∶70 and 40∶60). The physicochemical properties of different grease samples were tested and characterized. Meanwhile, the rheometer and SRV-V friction and wear tester were used to systematically evaluate the effects of poly-hexylnaphthalene added on the rheological and tribological properties of lithium grease. And with the help of 3D white light interference analyzer, the worn surface of the steel disc was analyzed. The experimental results show that the combination of poly-hexylnaphthalene and PAO8 had excellent synergistic effect at the mass ratio of 20∶80. The addition of poly-hexylnaphthalene can significantly improve the thickening ability of PAO8 base oil and save the amount of thickener. At the same time, poly-hexylnaphthalene can improve the rheological and tribological properties of PAO8 lithium grease under the condition of higher temperature (85℃).

Key words: poly-hexylnaphthalene, base oil, lithium grease, rheological properties, tribological properties

中图分类号:

TH 117

赵志萍, 陈晨, 汤琼, 徐红, 刘雷, 董晋湘. 多己基萘/聚α-烯烃锂基润滑脂的流变学和摩擦学性能[J]. 化工学报, 2023, 74(6): 2555-2564.

Zhiping ZHAO, Chen CHEN, Qiong TANG, Hong XU, Lei LIU, Jinxiang DONG. Rheological and tribological properties of poly-hexylnaphthalene/ poly-α-olefin lithium grease[J]. CIESC Journal, 2023, 74(6): 2555-2564.

图/表 11

图1 己基萘的气相谱图

Fig.1 Gas chromatogram of the hexylnaphthalene

图2 润滑脂样品的滴点和分油量

Fig.2 Dropping point and oil separation of grease samples

表1 不同皂分下（8%、10%）润滑脂样品的氧化起始温度

Table 1 The oxidation onset temperature of grease samples with different soap contents （8%，10%）

润滑脂	氧化起始温度/℃
润滑脂	8%	10%
PAO8	281.8	288.1
PHN10	290.0	288.4
PHN20	292.4	291.2
PHN30	297.3	298.8
PHN40	319.0	323.1

图3 不同皂分下以PAO8和PHN20为基础油的锂基脂的模量曲线

Fig.3 Modulus curves of lithium grease with PAO8 and PHN20 as base oil with different soap contents

图4 不同温度下不同多己基萘含量的锂基脂的模量曲线

Fig.4 Modulus curves of lithium grease with different poly-hexylnaphthalene contents at different temperatures

图5 不同温度下不同多己基萘含量锂基脂的tanδ曲线

Fig.5 tanδ curves of lithium grease with different poly-hexylnaphthalene contents at different temperatures

图6 不同锂基脂中皂纤维的SEM显微照片（30k×）

Fig.6 SEM images of soap fibers in different lithium greases (30k×)

图7 以PAO8、PHN20和PHN40为基础油制备的锂基脂在85、105℃下的摩擦曲线和平均摩擦因数

Fig.7 Friction curves and average friction coefficient of lithium grease prepared from PAO8, PHN20 and PHN40 as base oil at 85℃ and 105℃

图8 钢盘的磨损体积

Fig.8 Wear volume of steel disc

图9 85℃下以PAO8、PHN20、PHN40为基础油制备的锂基脂润滑的钢盘的3D白光图和磨痕轮廓图

Fig.9 3D images and profiles of wear scar of steel disc lubricated by different lithium grease prepared with PAO8，PHN20 andPHN40 as base oil at 85℃

图10 105℃下以PAO8、PHN20、PHN40为基础油制备的锂基脂润滑的钢盘的3D白光图和磨痕轮廓图

Fig.10 3D images and profiles of wear scar of steel disc lubricated by different lithium grease prepared with PAO8，PHN20 andPHN40 as base oil at 105℃

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