用新戊二醇(NPG)和对苯二甲酰氯(TPA)反应生成"低聚物"中间体,当n(NPG)/n(TPA)由2.4增加至3.0时,中间体的聚合度(m)在3.5～1.45之间,收率75.5%.再将中间体与油酸、菜籽油酸进行酯化得到复合酯,收率88.5%.结果表明,复合酯的粘度随着分子量的增大而增大,粘度指数大于125,凝点低于-27 ℃,氧化稳定性随分子量的增大而提高,生物降解率＞70%,最大无卡咬负荷(P_B)为784 N,磨斑直径0.41 mm,热分解温度＞250 ℃,因此目标产物是性能良好的绿色润滑剂.
An intermediate was prepared by the esterification of neopentyl glycol with paraphthaloyl chloride. The polymerization degree of the intermediate was between 3.5 and 1.45 as n(NPG)/n(TPA) was increased from 2.4 to 3.0. The yield of the intermediate was 75.5%. The complex ester was produced by esterification of the intermediate with oleic acid with a yield of 88.5%. The result shows that the viscosity was improved with the increase of the molecular mass of the product, the viscosity at 100 ℃ was between 17.8～27.6 mm~2/s, the viscosity index was more than 125, solidifying point was below -27 ℃, the oxidative stability was also improved with the increase of the molecular mass of the product. The biodegradabilities of complex esters were more than 70%. The value of P_B was 784 N, the value of wear diameter was 0.41 mm, the temperature of thermal decomposition was above 250 ℃. The complex esters can be used as excellent green lubricants.
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