Abstract: In order to reuse tungsten tailing, TTF was prepared through washing, pulverizing and surface modification processes, and applied in intumescent fire-retardant coatings. Then, flame retardancy and smoke suppression properties of TTF were studied by using big panel method, smoke density tests, thermogravimetric analysis (TG), scanning electron microscope (SEM) and fourier transform infrared spectroscopy (FTIR). The results show that synergistic flame retardancy and smoke suppression effect will be the best when TTF mass fraction is 3%, which exhibits flame spread rate of 4.3, equilibrium backside temperature of 84.8 ℃ at 900s, and smoke density rate of 14.2%. Char residue analysis indicates that adding TTF can promote coating to form more cross-linked structures and aromatic structures during burning, thus producing a more dense and thermally stable intumescent char layer against heat and mass transfer, which achieves better synergistic flame retardancy and smoke suppression effect.

Key words: intumescent fire-retardant coating, tungsten tailing filler (TTF), flame retardancy, smoke suppression effect, synergist