COMPOSITION OF THE CESS RESIDUE IN THE INDUSTRIAL PROCESS OF CARBONIZATION OF RICE HUSK AND STEM IN PRODUCINGFILLER FOR POLYMERIC MATERIALS

In the production of carbon-silica composite used as a filler for polymeric materials and obtained from plant waste such as rice husks and stems, 15-22% of still residue is formed during the carbonization process. This still residue is a resin. It was of interest to study the composition of this product, since it is obtained in commercial quantities and can be of interest as a functional additive for various purposes in the formulations of polymer compositions. A study of the still residue solubility showed that this resin is poorly soluble in both polar and non-polar solvents. Thermogravimetric analysis showed that the mass loss onset temperature is 60℃, at a temperature of 100℃ the sample loses 1.1% of its mass. At a temperature of 180℃ the mass loss is 5% by weight, the temperature of 10% mass loss is 228℃. During exposure at a temperature of 120℃, it was found that after 1 hour of exposure, the change in its mass ceases, which is due to the evaporation of fractions with a boiling point of up to 120℃. Further exposure of the resin for 4 hours does not lead to a change in mass. The composition of the studied still residue of the carbonization process was analyzed using X-ray fluorescence analysis methods. It was found that, excluding hydrogen, this resin mainly consists of carbon (̴ 69% by weight) and oxygen (̴ 29% by weight), as well as extremely small amounts of other chemical elements. A study using the IR spectroscopy method showed that in addition to aliphatic fragments, the resin contains a significant amount of polycyclic and substituted aromatic hydrocarbons, as well as oxygen-containing functional groups. The results obtained suggest that this product may be of interest as a functional additive in polymer compositions for various purposes.