Abstract: The thermogravimetric infrared (TG-FTIR) technology was used to study the pyrolysis characteristics of flexible organic plugging materials by changing the heating rate, particle size and atmosphere. The results showed that the faster the heating rate, the slower the pyrolysis reaction proceeded; the smaller particle diameter was more conducive to the pyrolysis reaction; Carbon dioxide was the main component of flue gas generated by pyrolysis in air atmosphere, which was mainly generated by the carbonization reaction of C-O bond fracture of resin materials and the decomposition of inorganic components in flexible organic plugging materials. A variety of aromatic compounds such as toluene, benzopyrene, pyridine and quinoline were found in the condensed liquid components of the pyrolysis of flexible organic plugging materials. Scanning electron microscopy (SEM), X-ray diffraction (XRD) and infrared spectroscopy (FTIR) analysis were performed on the solid residue after the pyrolysis of the flexible organic plugging materials. The results of the scanning electron microscope showed that the high temperature had a certain impact on the physical and chemical properties of the flexible organic plugging materials.

Key words: flexible organic plugging material, pyrolysis, temperature, particles, TG-FTIR, flue gas analysis