植物油酸新戊二醇对苯二甲酸复合酯的合成及性能

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(PB)为784N，磨斑直径0.41mm，热分解温度＞250 ℃，因此植物油酸新戊二醇对苯二甲酸复合酯是性能良好的绿色润滑剂。

Synthesis and Lubricity of Complex Esters of Vegetable Oil Acid Neopentyl Glycol and Terephthalic Acid

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.