EVALUATION OF OPERATIONAL COMPATIBILITY OF COMPOSITIONS BASED ON MODEL RUBBER CRUSH MIXTURES

UDC 678.074.678.762.2

  • Dolinskaya Raisa Moiseevna – PhD (Chemistry), Associate Professor, Assistante Professor, the Department of Polymer Composite Materials. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: raisa_dolinskaya@mail.ru

  • Prokopchuk Nikolay Romanovich – DSc (Chemistry), Corresponding Member of the National Academy of Sciences of Belarus, Professor, Professor, the Department of Polymer Composite Materials. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: nrprok@gmail.ru

DOI: https://doi.org/10.52065/2520-2669-2022-253-1-48-53

Key words: polyolefins, high-pressure polyethylene, crumb rubber based on EPDM and SKI rubbers, thermodynamic incompatibility, operationally stable polymer materials.

Для цитирования: For citation: Dolinskaya R. M., Prokopchuk N. R. Evaluation of operational compatibility of compositions based on model rubber crush mixtures. Proceedings of BSTU, issue 2, Chemical Engineering, Biotechnologies, Geoecology, 2022, no. 1 (253), pp. 48–53 (In Russian).DOI: https://doi.org/10.52065/2520-2669-2022-253-1-48-53.

Abstract

Compositions based on plastics filled with crumb rubber are actively used in world practice as a raw material alternative to vulcanized rubbers, from which rubber products are traditionally made.

In their composition, such compositions are similar to thermoplastic elastomers, which are particles of crosslinked rubber distributed in a thermoplastic matrix.

Polyolefins were used as the main objects of research: high-pressure polyethylene (LDPE) grade of 10803-020 (GOST 16337–77) and Vilotherm (a product representing LDPE waste of various grades) (TU 6-11-0203492-18–89) and crumb rubber based on EPDM and SKI rubbers.

When choosing thermoplastics, first of all, they took into account the availability and low cost (all LDPE grades are produced in the Republic of Belarus), physical and mechanical characteristics, resistance to various aggressive factors in real operating conditions and manufacturability during processing of compositions.

As a result of the studies carried out, concentration intervals were established in which the compositions are characterized by operational compatibility with the coexistence of two phases:
– crumb rubber based on EPDM-60 rubber and polyethylene (30–80 wt. % polyethylene);
– crumb rubber based on SKI-3 rubber and polyethylene (30–70 wt. % polyethylene).

Thus, the thermodynamic incompatibility of the components is not an obstacle to the creation of operationally stable polymer compositions.

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