Preparation and Improved Physical Characteristics of Propylene Oxide Rubber Composites.

Natalia Petrova,Viktoriya Portnyagina,Ee Shim,Jin-Ho Cho,Vasilii Mukhin

doi:10.3390/molecules23092150

Natalia Petrova, Viktoriya Portnyagina + Show 3 more

Open Access

https://doi.org/10.3390/molecules23092150

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Abstract

Sealing rubbers employed in cold climates such as the Siberian Arctic must be able to withstand temperatures as low as −50 °C while still exhibiting specific relaxation, strength, tribological characteristics, and a resistance to aggressive media. Previous investigations of propylene oxide rubber (SKPO, Tg = −73 °C) modified with polytetrafluoroethylene (PTFE) have revealed that, while the rubber composite materials exhibit double the wear resistance compared to unmodified polypropylene oxide rubber, they have poor frost resistance. In the present study, we developed materials based on SKPO and ultrafine PTFE (UPTFE), which can be characterized by its smaller particle size, low molecular weight, high tribo-technical characteristics, and resistance to aggressive media. The properties of the rubber composites were evaluated using the standard methods. The structures of the materials were investigated by electron microscopy and XRD analysis. It was shown that the materials have excellent wear resistance, resistance to aggressive media, compression set, and low-temperature resistance. The addition of UPTFE is preferable to the addition of PTFE because the desired positive effects can be attained with only 0.5–1 parts per hundred parts of rubber (phr) UPTFE while 20 phr PTFE would be necessary.

Highlights

Sealing rubbers must have high strength, high relaxation characteristics, excellent resistance to hydrocarbons, and good tribological characteristics [1,2] given that they are used in control machinery, feed machinery, power machinery, and other machinery systems that are exposed to pressure oscillations, pulse loads, liquid-hydrocarbon environments, and severe climates
SKPO-ultrafine PTFE (UPTFE) rubber composites were blended in a Plasticorder (Brabender PL-2200-3, Duisburg, Germany) at 35 ◦ C to 70 ◦ C for 20 min while maintaining the phr concentration of the other constituents
After 24 h, the SKPO-UPTFE rubber composite was cured at 150 ◦ C for 30 min in a hydraulic press

Summary

Introduction

Sealing rubbers must have high strength, high relaxation characteristics, excellent resistance to hydrocarbons, and good tribological characteristics [1,2] given that they are used in control machinery, feed machinery, power machinery, and other machinery systems that are exposed to pressure oscillations, pulse loads, liquid-hydrocarbon environments, and severe climates. In the Republic of Sakha (Yakutia), up to 30% of machinery failure cases in the fields of road transport, mining equipment, and pipelines are a result of the destruction or elasticity loss of rubber sealing parts [1] In this respect, research to determine the most efficient modifiers and the development of new rational compositions of rubbers with a high level of frost, oil, and wear resistance is crucial. Propylene oxide rubber composites with UPTFE (“Forum” brand, TU 2229-004-02698192-2002) [11,12,13,14] was investigated to achieve oil, wear, and frost resistance as well as enhanced mechanical properties in our ongoing effort to devise a material that can be applied even in arctic conditions

Materials and Methods

Results and Discussion

The SKPOrubber containing exhibitsby a characteristic

The XRD method fails to SKPO detect 1-phr

Conclusions

Patents