Synthesis and testing of additives of plant origin

The study is devoted to the determination of kinetic parameters of the process of asphalt-resin-paraffin deposits dissolution by oil fractions, solvents and compositions based on them. The study of the kinetics of deposits dissolution and the effect of additives on this process is relevant, as the use of solvents will reduce the cost of cleaning and repairing process equipment of refineries. A series of experiments was performed to determine the kinetic regularities of dissolution of different types of asphalt-resin-paraffin deposits in petroleum solvents of different fractional composition and the effect of dispersing agents on this process. Crude distilled oil fractions 110–1500С, 150–2000С and 140–2430С were shown to be the most effective for dissolving the asphalt-resin-paraffin deposits. The use of dispersant agents increases the degree of solubility of the components of the asphalt-resin-paraffin deposits. The kinetics of dissolution process obeys the Erofeyev-Kolmogorov equation.

Kinetics of dissolution of asphalt-resin-paraffin deposits when adding dispersing agents

Tertyshna¹,

Zamikula²,

Sukhyy³

et al. 2022

Influence of stearic acid on the properties of wood-polymer composites

Kryvolapov,

Sukhyy,

Bashtanyk

et al. 2023

We studied the influence of stearic acid on the technological, physical-mechanical and operational properties of composites based on secondary low-pressure polyethylene filled with wood flour. It was shown that the introduction of more than 1.1 wt.% of stearic acid into the wood-polymer composite improves the technological parameters of extrusion: the torque of the main drive of the extrusion equipment decreases and productivity increases. When the concentration of stearic acid in the composite is 0.8–1.25 wt.%, there is an improvement in the physical and mechanical parameters of the composite: the bending strength increases by 20% (up to 51.3 MPa) and the Charpy impact toughness of the samples with a cut increases by 37% (up to 11.9 kJ/m2), while the coefficient of linear thermal expansion and water absorption decrease.

Influence of fly ash on the properties of wood-polymer composites

Kryvolapov,

Sukhyy,

Bashtanyk

et al. 2024

This study reports the influence of fly ash on the operational, technological, and physical-mechanical properties of composites based on secondary high-density polyethylene filled with wood flour. It is shown that when calcite is replaced by fly ash in the composite, the operational and technological properties of the material are improved: water absorption, coefficient of linear thermal expansion and technological shrinkage are reduced. When using fly ash as a filler, there is also an increase in the flexural strength of the composite by 9% (from 51.3 MPa in the absence of fly ash to 55.8 MPa in the absence of calcite), but the Charpy impact toughness of samples with cut is decreased by more than 2 times (from 11.9 kJ/m2 to 5.1 kJ/m2, respectively).