Analysis of Components in Unknown Coating by Fourier Transform Infrared Spectroscopy and Gas Chromatography£­Mass Spectrometry

KeyWord:coating  component analysis  Fourier transform infrared spectroscopy£¨FT£­IR£©  gas chromatography£­mass spectrometry£¨GC£­MS£©  acrylate

Abstract:

      A method of Fourier transform infrared spectroscopy£¨FT£­IR£© coupled with gas chromatography£­mass spectrometry£¨GC£­MS£© was applied to the qualitative analysis of key chemical components in unknown coating£®The components extraction methods and solvents were optimized£¬and the optimal pretreatment conditions were determined£®The coating was dried into film at a constant temperature£¬then the coating film was cut into stripes and fragments£¬respectively£®After the pieces were extracted with acetonitrile and methanol successively£¬they were centrifuged at a high speed£¬and dissolved in tetrahydrofuran£®In addition£¬the stripes and the insoluble matters were analyzed by FT£­IR after dissolving£®Furthermore£¬combined with absorption peaks and spectral libraries as well as software£¬all unknown components were determined£®According to the results obtained£¬the coating film-forming substance was judged to be acrylate to a great extent£®Meanwhile£¬coatings£¬acetonitrile extracts and methanol extracts were analyzed by GC£­MS£®Retention index£¬spectral libraries and literatures were used for the qualitative analysis£®Results showed that the solvents in the coating mainly consisted of 2-ethylhexanol£¬o-xylene£¬m-xylene£¬acetophenone£¬giving coating special odors£®What¡¯s more£¬additives possibly included 1-methylnaphthalene£¬methyl palmitate£¬¦Á-methyl styrene£¬2£¬4-di-tert-butylphenol£¬2£¬4-dimethyl-6-tert-butylphenol and oleamide£¬etc£®The polymerization monomers in the unknown coating were butyl methacrylate and isooctyl acrylate£®