Retention of after ageing properties of grooved rubber pads based on natural rubber

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28610%2F17%3A63521680" target="_blank" >RIV/70883521:28610/17:63521680 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Retention of after ageing properties of grooved rubber pads based on natural rubber

Original language description

Cured rubber products undergo oxidative ageing and it is customary to suppress it as much as possible to increase the service life of any such product. Though natural rubber (NR) products exhibit very good initial mechanical properties, in some respects even superior to those of styrene butadiene rubbers (SBR), yet, unfortunately, on a comparative basis, they are also more susceptible to ageing. In the present work, two different recipies were mixed and cured meant to arrest the accelerated ageing of a specific product called the grooved rubber pads (GRP), without significantly sacrificing the mechanical and electrical properties. Rubber Pad is used to reduce the vibrations and noise caused by the trains. One formulation was based on a 70:30 weight ratio of NR and SBR while the other was based on only NR as the rubber of choice. Of course, a better choice of the pristine polymer would have been chloroprene rubber (CR) but at the cost of much higher priced products. Properties such as hardness, tensile strength, relaxed modulus at 100 % elongation, elongation at break percent, static load deflection, electrical resistance in dry condition as well as after water immersion for a specified period of time, tension set, compression set and after ageing retention of the mechanical properties were determined. It was found that in both the cases, the formulations were good enough to satisfy the after ageing retention of the required properties. However, since the initial properties were somewhat superior in case of the product formulated with NR, so it was taken as the ultimate formulation.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

10404 - Polymer science

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů