关键词: 抗氧剂, 硫代二甘醇, 溶剂法, 合成工艺

Abstract: The thio-diethylene glycol and 3,5 - di-tert-butyl-4 - hydroxyphenyl propionate are used to synthesize 2,2-thio-bis-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate in solvent. The effects of technique parameters on the product yield were studied, including catalyst loading, reaction temperature, and the ratio of raw material. Results show that catalyst loading should be 3.5% of 3,5- di-tert-butyl-4-hydroxyphenyl propionate in mass fraction, reaction temperature should be within 155～160℃, the mole ratio of raw material should be 1.77∶1(3,5-di-tert-butyl-4-hydroxyphenyl propionate：thio-diethylene glycol). Spectrophotometry was used to test the rate of scavenging effects of the hydroxyl free radical based on Fenton Oxidation experiment and results shows that the rate of scavenging effects of the hydroxyl free radical was higher than 99%. Antioxidant was also applied to gasoline and oxidation induction time was measured. The result showed the great effect of antioxidant 2,2-thio-bis-(3,5-di-tert-butyl-4-hydroxyphenyl) was achieved when it was applied to gas.

Key words: antioxidant, thio-diethylene, solvent, synthetic process