Quantitative analysis of 2,6-di-tert-butyl-4-methylphenol (butylated-hydroxytoluene) antioxidant in a solvent-formulated liquid polychloroprene adhesive and in cured polychloroprene adhesive films

Abstract

Two simple methods using internal standards are described for the quantitative analysis of 2,6-di-tert-butyl-4-methylphenol (butylated-hydroxytoluene, BHT) antioxidant in samples of solvent-formulated liquid adhesive and in cured polychloroprene adhesive films. Because only very small samples of cured adhesive could be taken from articles or components without substantially detracting from the product, the methods were developed to use minimal quantities of cured adhesive. The pyrolysis gas chromatography (PyGC) method required less than 1 mg of adhesive for analysis. The extraction method required less than 100 mg. A satisfactory correlation (r= 0.8) was obtained between the two methods. Recovery of BHT by extraction from cured Neoprene adhesive was better than 90%. Using 2,6-di-tert-butylphenol as internal standard, the error for the PyGC analysis method was 10%, while that of the extraction method was 1%.