POLYVINYL CHLORIDE COMPOSITIONS WITH FILLERS BASED ON RICE HUSK FOR LINOLEUM

The use of rice husk ash obtained at different temperatures and synthetic wollastonite based on it were studied as modifiers in the formulation of a polyvinyl chloride (PVC) composition for the production of the vinyl flooring (linoleum). The elemental and phase composition of the mineral part of rice husk and its ash obtained at different temperature conditions, as well as the effect of these modifiers on the physical and mechanical properties of the PVC material, were analysed. It was found that the ash obtained at a higher combustion temperature of rice husks contains a smaller proportion of the X-ray amorphous phase due to the crystallization of amorphous silicon dioxide and its transition to cristobalite, characterized by a crystalline structure. The study showed that synthetic wollastonite, obtained on the basis of rice husk ash and calcium oxide, contains mainly β-wollastonite, and larnite is an impurity in its composition. The maximum content of β-wollastonite in the composition is achieved at a solid-phase synthesis temperature of 900 °C. Rice husk ash, regardless of the temperature of its production, as well as synthetic wollastonite practically does not affect the bond strength between the layers or ply adhesion of PVC linoleum. At the same time, these modifiers noticeably reduce the migration of the plasticizer from the linoleum PVC paste modified by them. With an increase in the temperature of the process of obtaining rice husk ash and synthetic wollastonite on its basis, the migration of the plasticizer from the PVC paste modified by them increases. Synthetic wollastonite, obtained on the basis of rice husk ash and calcium oxide at an optimal temperature, has a white colour and reduces the migration of plasticizer from PVC paste for the production of linoleum. Therefore, it can be effectively used as a modifier of PVC compositions for the manufacture of floor coverings. For citation: Gotlib E.M., Sadykova D.F., Kozhevnikov R.V., Tverdov I.D., Mishagin K.A. Polyvinyl chloride compositions with fillers based on rice husk for linoleum. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2023. V. 66. N 2. P. 114-119. DOI: 10.6060/ivkkt.20236602.6692.