INVESTIGATION OF INTERACTION OF COMPONENTS FIRE-RETARDANT SYSTEM WITH POLYACRYLNITRILE FIBRE

DOI: 
10.6060/tcct.20165910.5402

Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2016. V. 59. N 10. P. 77-82

The interaction of acrylic fibres with the components of the fire-retardant system was studied by the use of complex of methods. Formation of chemical linkages was found be-tween carbonyl groups of the fibre and hydroxyl and methylol groups of flame-retardants. It was confirmed by infrared spectroscopy. In spectra of the modified fibres bands of vibrations of the carbonyl group are greatly reduced. Band corresponding to the stretching vibrations of the absorption bands of phosphorus-oxygen-carbon bond is appeared. Bands of absorp-tion of groups belonging to flame retardants are observed. Further evidence of the chemical interaction between acrylic fibres and components of the fire-retardant system is the presence of peaks of stretching vibrations of the previously mentioned groups in the modified fibres subjected to wet treatments. Direct involvement of the carbonyl groups in the reaction with the formation of the phosphorus-oxygen-carbon bond is proved by the decrease quantity of the carbonyl groups on the relation to the methylene group by comparing the ratio of optical densities corresponding to the absorption bands of these groups. Possibility of increase of the fire resistance of the fibre was revealed at introduction in the bath modifying of starch, per-forming the role of a fixing agent. Starch possesses the ability to form difficult soluble com-plexes in water. It is creating a protective layer on the surface of acrylic fibre, that prevents delete of the flame retardants from surface of modified fibre during its wet treatments. The increase in efficiency of interaction of the flame retardants with acrylic fibre was shown in the modification of newly formed fibre having unformed structure and a large number of open pores. Newly formed acrylic fibre has better sorption capacity compared with condi-tioned fibre, and it is capable to better interaction with components of the fire-retardant sys-tem. As a result it was stated that fibres obtained belong to the class of flame-retardant

Key words: acrylic fibre, modification, flame retardants, fire-retardant system, interaction mecha-nisms, flammability indicators

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2016, Т. 59, № 10, Стр. 77-82

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