高碱值壬基二苯胺的制备及性能研究

在实验室以C9烯烃和二苯胺为原料，在非游离质子酸型催化剂作用下通过直接烷基化反应制备高碱值壬基二苯胺抗氧剂。利用核磁、薄层色谱、柱层析等分析方法对制备产品进行了分离和结构表征，并通过旋转氧弹和PDSC等方法对经分离后的产品进行性能评价。结果表明：组分Ⅰ，Ⅱ，Ⅲ，Ⅳ分别对应三壬基二苯胺、二壬基二苯胺、单壬基二苯胺、二苯胺，各组分碱值由大到小的顺序为二苯胺＞单壬基二苯胺＞二壬基二苯胺＞三壬基二苯胺；所制备的壬基二苯胺与商品抗氧剂相比，碱值升高，抗氧化性能增强，二苯胺剩余量降低。

PREPARATION AND PERFORMANCE OF NONYL DIPHENYLAMINE

Nonyl diphenylamine as a high base number antioxidant was synthesized by alkylation of diphenylamine with C9 olefins in the presence of solid Lewis acid catalyst in the laboratory. The product was isolated and characterized by NMR, TLC, and chromatography to determine the structure of these products and the content of the different components. The antioxidant performance in base oil was evaluated by means of RBOT and PDSC. It shows that the synthesized antioxidant contains tri-substituted (I) diphenylamine (II), disubstituted diphenylamine (III), monosubstituted diphenylamine (IV) and the unreacted diphenylamine. The total base number(TBN) order of these Component is Ⅳ>Ⅲ>Ⅱ>Ⅰ,the product prepared in lab has a higher TBN, better resistance to oxidation and less remaining diphenylamine compared to existing product.