Chemical structure of ethylene propylene rubber


In the polymerized molecular structure of ethylene-propylene rubber, the ratio of ethylene/propylene content has a direct impact on the properties and manufacturability of ethylene-propylene rubber raw rubber and compound rubber. In application, 2-3 kinds of ethylene-propylene rubbers with different ethylene/propylene content ratios can be used together to meet different performance requirements. It is generally believed that the ethylene content is controlled at about 60% in order to obtain better processability and vulcanizate performance; when the propylene content is high, the low-temperature performance of ethylene-propylene rubber is improved; when the ethylene content is high, it is easy to extrude, extrude .The exit surface is smooth, and the extruded parts are not easy to deform after parking.

Ethylene propylene Rubber

The weight-average molecular weight of ethylene-propylene rubber is 200,000-400,000, the number-average molecular weight is 50,000-150,000, and the viscosity-average molecular weight is 100,000-300,000. Weight average molecular weight is closely related to Mooney viscosity. The Mooney viscosity value of ethylene-propylene rubber [ML (1+4) 100°C] is 25-90, and there are many varieties with a high Mooney value of 105-110. As the Mooney value increases, the filling capacity can also increase, but the processing performance becomes worse; the tensile strength and resilience of the vulcanized ethylene-propylene rubber are improved. The molecular weight distribution index of ethylene-propylene rubber is generally 3-5, mostly around 3. Ethylene-propylene rubber with a wide molecular weight distribution has better mill mixing and calendering properties.

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