PHYSICO-MECHANICAL PROPERTIES OF VULCANIZATES CONTAINING WASTE FROM THE FAT AND OIL INDUSTRY

For the first time, the possibility of replacing carbon black and stearic acid with waste from the fat and oil industry (diatomite, bleached clay) is investigated. The value of the conditional tensile strength for vulcanizates containing stearic acid is 8,26 MPa, and for the studied vulcanizates containing selected clay, it is in the range of 7,88-8,39 MPa, for those containing diatomite is 7,88-8,43 MPa. The elongation at break for the studied vulcanizates containing selected clay increases from 280% to 300%, for those containing diatomite is from 280 to 297%. A hardness according Shore is found for the studied ones containing selected clay and diatomite in the range of 64-71 conv.units, for the reference rubber of 63 conv.units.
The conducted studies show that the conditional strength and tear resistance decrease when carbon black is replaced with selected clay, as well as diatomite, but the indicators remain within the permissible limits for this rubber. The main role in enhancing the regenerate is played by caoutchouc. Therefore, carbon black and stearic acid can be replaced with less active, but cheaper and environmentally friendly ingredients. Extended physico-mechanical tests of experimental rubbers led to the conclusion that is most expedient to use waste from the fat-and-oil industry in the formulation of rubber mixtures for the manufacture of under-rail laying of railway tracks, since when using waste from the fat-and-oil industry, the properties of rubbers practically do not change, comply with control standards.

1. The use of related products of the fat and oil industry in the production of tire regenerate / G.N. Kalmatayeva et al // News of the National Academy of Sciences of the Republic of Kazakhstan. Chemistry and Technology Series. – 2022. – № 4. – Р. 46-57.

2. Marvin M. MacKillop Rubber Recycling / M. Marvin, A. Duncan // Rubber Chemistry and Technology. – 2002. – № 75(3). – Р. 429-474.

3. Saeed O.M. Review of the reclaiming of rubber waste and recent work on the recycling of ethylene–propylene–diene rubber waste / О.М. Saeed, А. Ali., S. Estagy // Rubber Chemistry and Technology. – 2016. – № 89(1). – Р. 54-78.

4. Toxicological Assessment of Coated versus Uncoated Rubber Granulates Obtained from Used Tires Aiming to its Use in Sport Facilities / J. Gomes et al // Journal of Air and Waste Management Association. – 2010. – № 60(6). – Р. 741-746. DOI: https://doi.org/10.3155/1047-3289.60.2.1.

5. The effect of waste from the fat and oil industry on the properties of elastomeric compositions / G.N. Kalmataeva et al // Reports of the National Academy of Sciences of the Republic of Kazakhstan. Chemistry and Technology Series, Almaty. – 2023. – № 2. – Р. 139-152. http://reportsscience.kz/index.php/en/archive.

6. The effect of regenerate on the properties of rubber compounds and their vulcanizates / G.N. Kalmatayeva et al // News of the national academy of sciences of the republic of Kazakhstan series chemistry and technology. – 2023. – Vol. 3, № 456. – Р. 96-104. https://doi.org/10.32014/2023.2518-1491.180.

7. Modification of tyre rubber crumb with wastes of plant oil production / G.F. Sagitova et al // Advances in Polymer Technology. – 2023. – Р. 1-8. DOI: https://doi.org/10.1155/2023/6889286.

8. K. Nakansii Infrared spectra and organic compounds, translated from the English by Ph.D. N.B. Kupletskaya and L.M. Epstein, edited by Ph.D. A.A. Maltsev, M., publishing house «Mir». – 1965. – 216 р.

9. Bellamy L. Infrared spectra of complex molecules / L. Bellamy. – M., publishing house «Chemistry». – 1973. – 396 р.

10. Brand J. Application of spectroscopy in organic chemistry / J. Brand, G. Eglinton. – M., publishing house «Mir». – 1967. – 280 р.