Regulation of rheological and mechanical properties of polypropylene compositions for automotive parts

Authors

DOI:

https://doi.org/10.15587/2312-8372.2018.152056

Keywords:

polypropylene, calcite concentrate, propylene-octenoic block copolymers, rheological properties, mechanical properties, impact strength, autimotive parts

Abstract

The object of research is the technology of producing filled impact-resistant compositions based on polypropylene for the manufacture of automotive parts. The main problem is the reduction of strength and technical characteristics with an increase in the amount of filler in the compositions. To solve this problem, the injection of a modifier in an amount of 5 mass % is proposed in filled polypropylene compositions.

The effect of the filler and modifier on the rheological and mechanical properties of polypropylene-based compositions has been studied. It has been established that the presence of calcite concentrate as a filler and propylene-octenoic block copolymers as a modifier in the composition helps to reduce its viscosity, which is due to the predominant effect of the emulsifying action of calcium stearate over the thickening effect of the mineral filler. An increase in the melt flow index in compositions with 5 % propylene-octenoic block polymer is shown, which is explained by its plasticizing effect and good combination with polypropylene. It is shown that the injection of the filler to 10 mass % increases the impact strength compared to the original polypropylene. A further increase in the filler content to 20 % in the compositions reduces the impact strength to almost the value for the output polypropylene with an uncritical decrease in tensile strength. It is shown that the presence of 5 mass % of the modifier in the compositions increases the value of the relative elongation.

It is determined that the developed composition with 5 mass % of the modifier and with varying the amount of filler can be used for the production of parts for cars for various purposes without significant changes in the technological cycle. The advantage of the investigated compositions is the reduction of energy consumption for the processing of highly filled compositions. The implementation of the developed technologies does not require additional capital investments for the re-equipment of the enterprise, since the developed compositions can be processed using conventional extrusion equipment.

Author Biographies

Svetlana Saitarly, Kyiv National University of Technologies and Design, 2, Nemyrovycha-Danchenka str., Kyiv, Ukraine, 01011

Postgraduate Student

Department of Applied Ecology, Technology of Polymers and Chemical Fibers

Viktoriia Plavan, Kyiv National University of Technologies and Design, 2, Nemyrovycha-Danchenka str., Kyiv, Ukraine, 01011

Doctor of Technical Sciences, Professor, Head of Department

Department of Applied Ecology, Technology of Polymers and Chemical Fibers

Nataliia Rezanova, Kyiv National University of Technologies and Design, 2, Nemyrovycha-Danchenka str., Kyiv, Ukraine, 01011

PhD, Associate Professor

Department of Applied Ecology, Technology of Polymers and Chemical Fibers

Nadiya Sova, Kyiv National University of Technologies and Design, 2, Nemyrovycha-Danchenka str., Kyiv, Ukraine, 01011

PhD, Associate Professor

Department of Applied Ecology, Technology of Polymers and Chemical Fibers

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Published

2018-05-31

How to Cite

Saitarly, S., Plavan, V., Rezanova, N., & Sova, N. (2018). Regulation of rheological and mechanical properties of polypropylene compositions for automotive parts. Technology Audit and Production Reserves, 6(3(44), 9–13. https://doi.org/10.15587/2312-8372.2018.152056

Issue

Vol. 6 No. 3(44) (2018): Chemical engineering

Section

Chemical and Technological Systems: Original Research

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Copyright (c) 2018 Svetlana Saitarly, Viktoriia Plavan, Nataliia Rezanova, Nadiya Sova

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