采用甲醛缩合法制备了芳胺低聚物型润滑油抗氧剂,考察了不同催化条件(酸催化和碱催化)对产物结构和性能的影响,优选得到碱性催化剂三乙胺.在该催化剂作用下N-辛基苯基-1-萘胺与甲醛发生缩合反应的位置主要在芳环上,产物的抗氧化性能良好;考察了反应条件对合成产物性能的影响,优化得到最佳合成条件为:反应温度65 ℃、N-辛基苯基-1-萘胺与多聚甲醛的摩尔比1∶0.75、反应时间40 h.
PREPARATION AND PERFORMANCE RESEARCH OF AROMATIC AMINE OLIGOMER ANTIOXIDANT FOR LUBRICATING OIL
Aromatic amine oligomer antioxidants for lubricating oil were prepared by formaldehyde condensation method,the effects of different catalytic conditions on the structure and properties of the products were investigated,and triethylamine was selected as the catalyst.The results indicated that the formaldehyde condensation reaction of N-octylphenyl-1-naphthylamine under alkaline catalysis mainly occurs on the aromatic ring,and the product had good antioxidant performance for lubricating oil.The optimum synthesis conditions were as follows:triethylamine as catalyst,a reaction temperature of 65℃,molar ratio of N-octylphenyl-1-naphthylamine to polyformaldehyde of 1∶0.75,and a reaction time of 40 h.
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