Application of Paper Chromatography to the Identification of Accelerators and Antioxidants

Abstract

Abstract Various difficulties in the identification of accelerators and antioxidants in rubber compounds are reviewed. A detailed procedure for the detection of four guanidine derivatives by paper chromatography is mentioned. The identification of diphenyl thiourea and diorthotolyl thiourea is also described. A detailed procedure is given for the paper-chromatographic separation and identification of some mercapto-substituted heterocyclic compounds. The detection of these accelerators in rubber mixes and vulcanizates is also described. A detailed procedure is given for paper Chromatographic separation and identification of dithiocarbamates, which are used as ultra-accelerators in the rubber industry. These dithiocarbamates decompose in acid medium into secondary amines. The salts of these amines are better soluble in water than the dithiocarbamates, and are therefore more suitable for a paper-chromatographic separation. A method for the simultaneous detection of dithiocarbamates and thiuram sulfides is also described. The paper-chromatographic separation and identification of various antioxidants is described. Because only few antioxidants can be separated by paper chromatography after coupling with diazotized arylaminosulfonic acids, it is preferable to separate these compounds, which are generally insoluble in water, by means of acetylated filter paper. The identification of antioxidants using acetylated filter paper is described. A detailed procedure is given for the identification of accelerators and antioxidants in rubber mixes and vulcanizates of unknown composition.