Effect of sulfenamide accelerators on properties of NBR
According to the formula of the inner rubber layer of hydraulic hose,the effects of sulfenamide accelerators CBS,NOBS,DZ and NS on the vulcanization,mechanical properties and aging resistance of NBR were investigated.The results show that NBR has longer scorch time and better processing safety.With the increase of DZ dosage,the scorch time of NBR changed little and was controlled at about 3 min,which showed better processing safety,while the positive vulcanization time became shorter and shorter,but it could also be controlled at about 10 min,it can balance the reaction between sulfur and rubber and copper-plated steel wire;the hardness,tensile strength and constant tensile strength of vulcanizate are increasing,and the tendency of tensile strength increasing is more obvious;the permanent deformation of the vulcanizate at break begins to decrease significantly;After that,there is no change.The hardness of vulcanizate decreased about 4-5,tensile strength and elongation decreased slightly but not obviously,and the permanent deformation change was very small.
nitrile rubbersulfenamide acceleratorhot oil agingscorch time
NETL
NSTL
万方数据
