Synthesis and tribological properties of non-phosphorus and sulfur-free heterocyclic derivatives of triazine as lubricant additives

doi:10.11949/j.issn.0438-1157.20161472

Abstract

Abstract:

Two kinds of non-phosphorus and sulfur-free triazine derivatives lubricant additive 2,4,6-tri-morpholine-sym-triazine (named as CMMM) and 2,4,6-tri-phenol-sym-triazine (named as CPPP) were synthesized using cyanuric chloride, morpholine and phenol as raw materials,their structures were characterized by FT-IR and elemental analysis. The thermal stabilities of CMMM and CPPP were studied by thermal analysis, and their solubility properties were also researched. The friction reducing, anti-wear and load-carrying capacities of CMMM and CPPP in rapeseed oil were investigated by four-ball test. CMMM and CPPP were mixed with T202 respectively, and the tribological properties of them were also tested. The surface morphology and the elemental composition of the tribofilms were investigated by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS), respectively. The results revealed that the synthetic products were the target compounds CMMM and CPPP, they completely dissolved and had good soluble properties in rapeseed oil. The decomposition temperature of CMMM and CPPP ranged from 270.16℃ to 347.58℃, and from 285.26℃ to 478.45℃, respectively. The thermal stability of CPPP was better than that of CMMM. CPPP exhibited more superior tribological performances than CMMM under different experimental conditions of test loads and additive concentrations. The excellent tribological property of CPPP may be due to the phenol ring is tighter than the morpholine ring, which plays an important role in friction reducing and anti-wear of boundary lubrication. The best ratio of CMMM to T202 was 5:5, the best ratio of CPPP to T202 was 3:7.

Key words: non-phosphorus and sulfur-free, triazine derivatives, lubricant additive, synthesis, solubility, stability, ribological properties

摘要：

以三聚氯氰和吗啉、苯酚为原料合成了两种无硫磷的三嗪含氮杂环衍生物2，4，6-三吗啉基-均三嗪（CMMM）和2，4，6-三苯酚基-均三嗪（CPPP）润滑油添加剂，并采用FT-IR和元素分析对其结构进行了表征。考察了CPPP和CMMM的热稳定性和油溶性。采用四球摩擦磨损试验机研究了CMMM和CPPP在菜籽油中的极压、抗磨及减摩性能；并测试了CMMM和CPPP分别与T202进行复配后的摩擦学性能。采用SEM和EDS观察摩擦表面的形貌特征和元素。结果表明，合成了目标产物CMMM和CPPP；CMMM和CPPP在菜籽油中具有良好的溶解性；在相同实验条件下，CMMM和CPPP的分解温度范围分别为270.16~347.58℃和285.26~478.45℃。两者具有良好的热稳定性，且CPPP的热稳定性优于CMMM；在不同的载荷、添加比例等条件下，CPPP的摩擦学性能优于CMMM。CPPP优异的摩擦学性能得益于分子中含的苯酚环比吗啉环更加紧密，在摩擦过程中，添加剂与摩擦副表面发生化学反应，生成了含氮的复合边界润滑膜，起到减摩抗磨的作用。复配性能测试发现，在不同的载荷、添加比例等条件下，CMMM与T202的最佳复配比为5:5，CPPP与T202的最佳复配比为3:7。

关键词: 无硫磷, 三嗪衍生物, 润滑油添加剂, 合成, 溶解性, 稳定性, 摩擦学性能

CLC Number:

U473.6

GONG Pijian, WANG Haiyan, TANG Haiyan, XU Hongbin, ZHANG Yi. Synthesis and tribological properties of non-phosphorus and sulfur-free heterocyclic derivatives of triazine as lubricant additives[J]. CIESC Journal, 2017, 68(4): 1702-1711.

公丕建, 王海彦, 唐海燕, 徐红彬, 张懿. 无硫磷三嗪杂环衍生物润滑油添加剂的制备及摩擦性能[J]. 化工学报, 2017, 68(4): 1702-1711.

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