Research On The Reactive Age-resistant Emulsion Copolymerization With Butadiene And Acrylonitrile

The emulsion copolymerization between polymerization ageing resistant and butadi ene and acrylonitrile at 5-20℃,NBR was obtained with 27% bound AN content and 1 % bound antioxidant content. The main factors are investigated:the effect of three dif ferent initiator, three different oxidizer and their dosage, different kinds of reactive an tioxidant and it's dosage, emulsifier and reductant on the copolymerization rate and e mulsion physical performance and the NBR rubber performance were studied all. The effect on the copolymeration rate and emulsion physical performance and the NBR ru bber performance by the different rising copolymerization temperature ways, the dosag e and different addition ways of molecule weight regulator on rubbers properties were also investigated. The optimum polymerization ingredient and polymerization condition s has been determined.The results indicates that reactive antioxidant slow the copolymerization rate rema rkably. The NAPM could copolymerization with butadiene and acrylonitrile by optimiz ing the initiator, regulator, reaction age resistant, emulsifier and the controling of cop olymerizaton temperature. The optimum dosage of NAPM is 1.75%, The ratio of diis opropyl benzene hydroperoxide/Rongalit/EDTA(FeNa)=0.10:0.0125:0.125, the copolymeri zation rate is fast and the emulsion stability are optimum, when the colopholic potassi um soap is 4.6-5.0%, the emulsion have a high Maron stability. When the dosage o f TDM is 0.48%, and addition ratio of TDM is 23.1%, the mooney viscosity index a nd gel content in rubber is in reasonable range. The copolymerizaton temperature incr ease by the equation 5℃×1h+5～8℃. The NBR plays excellent properties, the result of absorption oxygen test is 0.239 at 100℃and standing 100h.