可生物降解润滑油添加剂哌嗪衍生物的合成及性能评定

选用六水合哌嗪为母体，二氯甲烷为溶剂，三乙胺为缚酸剂，正己胺、十二胺、氯乙酰氯为原料，合成新型可生物降解润滑油添加剂1,4-双（二硫代甲酸乙酰正己胺）哌嗪和1,4-双（二硫代甲酸乙酰十二胺）哌嗪；采用FT-IR，1HNMR，TG手段对合成产物进行结构表征及对产品热稳定性进行测试。以菜籽油为基础油，采用四球摩擦磨损试验机考察合成添加剂的抗磨性能，并对其进行可生物降解性测定。结果表明：合成产品与预测结构相同，热分解温度最低为305 ℃，与菜籽油的溶解度高达2.58%（质量分数），1,4-双（二硫代甲酸乙酰十二胺）哌嗪具有较好的抗磨性能，1,4-双（二硫代甲酸乙酰正己胺）哌嗪具有较好的减摩性能，两者均具有优异的可生物降解性能（BDI大于80%）。

PREPARATION AND PROPERTIES OF BIODEGRADABLE LUBRICATING OIL ADDITIVE PIPERAZINE DERIVATIVES

In order to reduce the environmental pollution caused by oil, new biodegradable lubricating oil additives 1,4-bis (dithiocarbamoyl-n-hexylamine) piperazine (NP) and 1,4-bis (dithiocarbamate) piperazine (DP) were synthesized with piperazine (PP) as a precursor, dichloromethane as solvent, triethylamine as acid binding agent, n-hexylamine, dodecylamine and chloroacetyl chloride as raw materials. The structures and thermal stability of products were characterized by FT-IR, 1HNMR and TG techniques. Using rapeseed oil as lubricating base oil, the anti-wear performance and biodegradabilities, BDI index of additives were tested. The results showed that the thermal decomposition temperature is 305℃, and the solubility in rapeseed oil is better(up to 2.58%). The anti-wear performance of DP is better than NP, while the anti-friction performance of NP is better than DP. Both NP and DP have excellent biodegradability (BDI> 80%).