NF ISO 11235, T45-027 (08/2023)

This document specifies the methods to be used for the evaluation of sulfenamide accelerators: — MBTS: mercaptobenzothiazyl disulfide; — 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 1 Although MBTS is not a sulfenamide, it is the primary decomposition product of these accelerators and is determined quantitatively by the method specified in 5.2. The analytical methods are applicable for most commercial sulfenamide accelerators: — primary amine sulfenamides (type I); — secondary amine sulfenamides with non-delayed action (type II); — delayed-acting secondary amine sulfenamides (type III). NOTE 2 The classification and key properties of sulfenamide vulcanization accelerators are described in Annex A. Method (5.2) for determining purity by high performance liquid chromatography (HPLC) is the preferred method.
(Automatic translation from French)