Alcance
ISO 11235:2016 specifies the methods to be used for the evaluation of sulfenamide accelerators:- MBTS: benzothiazyl disulphide;- CBS: N-cyclohexylbenzothiazole-2-sulfenamide;- TBBS: N-tert-butylbenzothiazole-2-sulfenamide;- DIBS: N,N'-diisopropylbenzothiazole-2-sulfenamide;- DCBS: N,N'-dicyclohexylbenzothiazole-2-sulfenamide;- MBS: N-oxydiethylenebenzothiazole-2-sulfenamide.NOTE Although MBTS is not a sulfenamide, it is the primary decomposition product of these accelerators and quantitatively determined by the method specified in 5.2.The analytical methods are applicable for most commercial sulfenamide accelerators:- sulfenamides of primary amines (type I);- sulfenamides of unhindered secondary amines (type II);- sulfenamides of hindered secondary amines (type III).The method (5.2) to determine purity by high performance liquid chromatography (HPLC) is the preferred method.