SYNTHETIC WOLLASTONITE AND DIOPSIDE ON THE BASE OF RICE HUSK ASH AS FILLERS OF EPOXY COMPOSITE MATERIALS

Natural wollastonite and diopside are unique fillers for the construction of efficient polymer composite materials with improved mechanical properties. Due to their high cost and scarcity in the domestic market, it is important to obtain these calcium-magnesium silicates (KMS) by solid-phase synthesis from inexpensive raw materials (agricultural high-tonnage rice production waste). The phase composition and properties of synthetic wollastonite and diopside were studied, and their effect on the performance properties of filled epoxy materials was evaluated. Studies have been conducted to determine the phase composition, porosity, and acid-base properties of synthesized fillers, and the effect of these characteristics on the performance properties of filled epoxy compositions has been evaluated. Synthetic wollastonite and diopside differ significantly in their phase composition. Synthetic wollastonite contains larnite as a side phase. Compared with diopside, it has a significantly larger specific pore surface and an order of magnitude larger total pore volume due to the lower temperature of its solid-phase synthesis and impurities of crystalline silicon dioxides. It was found that filling with silicates leads to the formation of a more organized polymer matrix structure. The obtained calcium-magnesium silicates are effective fillers of composite epoxy materials, the presence of which in the composition provides increased hardness, adhesive strength, wear resistance, reduces the coefficient of static friction, that is, improves the tribological properties of filled epoxy materials, which can be successfully used in mechanical engineering.

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