Rubber Antioxidant 4020 Study On The Synthesis

Antiozonant 4020 is an importang kind of antiozotant,can be widely applied in rubber industry.This paper introduced the method to synthesize 4020 by using Pd/C catalysts. Mainly discussed the influence of prepare condition on catalysis capability of 1%Pd/C.Using this catalyst synthesized antiozonant 4020.Compared its catalysis capabilit with 5%Pd/C catalyst.The influence of catalyst capability was studied,When the concentration of HNO₃ was 35%,the impregnation pH value was 2.52,the concentration of impregnation was 1.2g/mL, the impregnation temperature was 80℃,the impregnation time was 2h,the consumption amount of HCHO is 6mL,the catalyst capability was best.Using this catalyst synthesized antiozonant 4020,when the temperature was 140℃,the molar ratio of 4-aminodiphenylamine and methyl isobutyl ketone was 1:2.5,the pressure of hydrogen was 4,5Mpa,the weight of 1%Pd/C catalyst was 1.472g,the stirring rapid was 900rad/min,the yield of 4020 was 94.70%.We also study the influence of different factors when using 5% Pd/C as catalyst,when the temperature was 150℃,the molar ratio of 4-aminodiphenylamine and methyl isobutyl ketone was 1:3,the pressure of hydrogen was 3.5Mpa,the weight of 5% Pd/C catalyst was 0.552g,the stirring rapid was 1000rad/min,the yield of 4020 was 92.56%. 1%Pd/C catalyst can be repeatedly used for 4 times,if added fresh catalyst,it can be runned stabely for 15 times,the possible deactivation reason of catalyst was discussed.The mechanism was discussed,Intermediate was separated and characterized,the final product was analyzed by LC-MS,IR,NMR.