Hydrogenated nitrile rubber formula for toothed belts

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Formulated hydrogenated nitrile rubber for toothed belts: Hydrogenated nitrile rubber (H-NBR) is widely used in V-belts and toothed belts due to its high strength as a raw material, as well as its excellent resistance to oil and ozone aging. Existing sulfidation systems tend to produce nitrosamines, which is harmful to the environment and detrimental to workers’ health; foreign patents propose a new safe production formula. For example: H-NBR 100, zinc oxide 5, stearic acid 1, antioxidant 4, carbon black 50, accelerator TOT-N 6, accelerator ZTC 1, DM 2, sulfur 0.5. The physical properties of the toothed belt products manufactured using this formula are as follows: hardness of 66, elastic modulus of 2.9 MPa at 100%, breaking strength of 28.4 MPa, elongation of 467%. The heat resistance test results at 120°C are 1552 hours, which is the same as that of ordinary products. However, no nitrosamines were detected in this formula; it is a safe production formula used for manufacturing conveyor belts.