具有黏度改性功能的聚异丁烯基抗氧化剂的合成与评价

以高活性低相对分子质量聚异丁烯和3-（3,5-二叔丁基-4-羟基苯基）丙酸甲酯为原料，合成了具有黏度改性作用的聚异丁烯基抗氧化剂。所得产物的傅立叶变换红外光谱分析结果与目标产物结构吻合。TG分析结果表明，合成的聚异丁烯基抗氧化剂比聚异丁烯具有更好的热稳定性，起始氧化温度提高40 ℃。旋转氧弹测试结果表明，合成的聚异丁烯基抗氧化剂具有良好的抗氧化作用，添加量（w）为0.5%时可将矿物油的氧化诱导期从27 min延长至84 min，明显提高了油品的氧化安定性。在矿物油中加入量（w）为5.0%时，油品的黏度指数从114提高到132，说明该聚异丁烯基抗氧化剂在改善油品黏度方面具有积极作用。

SYNTHESIS AND CHARACTERIZATION OF ANTIOXIDANT WITH VISCOSITY MODIFIER FUNCTION FROM POLYISOBUTYLENE

A polyisobutylene base antioxidant having viscosity modifier function was synthesized using highly reactive polyisobutylene and 3-(3, 5-di-tert-butyl-4-hydroxy-phenyl) methyl acrylate as raw materials. The FT-IR analysis results showed that the structure of this synthesized antioxidant was consistent with that of the designed product. Results of TG analysis suggested that this antioxidant had excellent thermal oxidation stability and its incipient oxidative decomposition temperature was 40 oC higher than that of polyisobutylene. Rotary bomb oxidation test results showed this antioxidant exhibited good antioxidation properties, the oxidation induction time of mineral oil could be prolonged to 84 min (from 27 min) when this antioxidant was added with a mass fraction of 0.5%. The oxidation stability was improved evidently. When it was added with a mass fraction of 5.0%, testing kinematic viscosity of oil samples at 40 oC and 100 oC showed that the viscosity index of oil increased from 114 to 132, which indicated that this antioxidant also possessed the function of viscosity modifier.