1 Scope
This document specifies the methods to be used for the evaluation of sulfenamide accelerators:
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— MBTS: benzothiazyl disulphide;
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— CBS: N-cyclohexylbenzothiazole-2-sulfenamide;
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— TBBS: N-tert-butylbenzothiazole-2-sulfenamide;
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— DIBS: N,N'-diisopropylbenzothiazole-2-sulfenamide;
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— DCBS: N,N'-dicyclohexylbenzothiazole-2-sulfenamide;
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— MBS: N-oxydiethylenebenzothiazole-2-sulfenamide.
NOTE 1 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:
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— sulfenamides of primary amines (type I);
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— sulfenamides of unhindered secondary amines (type II);
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— sulfenamides of hindered secondary amines (type III).
NOTE 2 Classification and key properties of sulfenamide accelerators are described in Annex A.
The method (5.2) to determine purity by high performance liquid chromatography (HPLC) is the preferred
method.