МОДИФИКАЦИЯ РЕЗИН НА ОСНОВЕ ЭТИЛЕНПРОПИЛЕНДИЕНОВОГО КАУЧУКА СИЛОКСАНОВЫМ КАУЧУКОМ

Abstract

Rubbers based on ethylene propylene diene rubber are widely used in the cable industry due to the possibility of using such rubbers in extreme conditions. However, such rubbers have limitations in heat resistance. To increase the heat resistance of such rubbers, it is possible to combine ethylene propylene diene with other rubbers. At the same time, it must be taken into account that the rubbers must be compatible with each other. To increase the heat resistance of rubbers based on ethylene propylene diene rubber, it is possible to introduce silicone rubber into the composition. Owing to the unique character of the main chain consisting of alternating atoms of silicon and oxygen, siloxane rubber-based rubbers have increased thermal and fire resistance, which makes them widely used for the production of items operating in high-temperature conditions. Ethylene propylene diene and silicone rubbers can be vulcanized with a common agent - organic peroxide. There are known works on improvement of frost resistance of rubbers based on ethylene propylene diene rubber by combining it with methylphenylsiloxane rubber. In this work the influence of SKTV-1 rubber content up to 50% wt. % on the properties of rubber based on EPDM is investigated. Vulcanization characteristics, physical and mechanical properties of rubbers before and after thermal aging, and electrical insulating properties were assessed. Thermal aging of rubber was carried out at temperatures of 130, 150 and 180 °C. It has been established that with a ratio of EPDM/SKTV rubbers of 90/10, it is possible to increase the heat-resistant properties of rubbers. For better combination of rubbers, a plasticizer based on siloxane rubber destructor was introduced in an amount of 5 parts by weight. The plasticizer makes it possible to increase the compatibility of rubbers and does not negatively affect the entire range of properties.