Method for producing hydrogenated nitrile rubber and hnbr compositions thereof
A technology of hydrogenated nitrile rubber and nitrile rubber, applied in the field of hydrogenated nitrile rubber
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[0133] materials used
[0134]
[0135] mooney aging
[0136] To assess Mooney aging, the change in Mooney viscosity was measured after an exemplary aging process. The values for the Mooney viscosity (ML1+4 at 100° C.) were determined in each case by means of a shear disc viscometer according to ASTM D1646-07. Two test samples were cut from the rubber. Place the sample to be aged on the intermediate rack in an air-circulating drying oven heated to 140 °C. The samples were kept at 140°C for 4 days in the air circulating drying oven.
[0137] Mooney viscosities were determined from unaged and aged samples. ΔMV is derived from the difference between the measured values of aged and unaged samples.
[0138] gel content
[0139] In about 20 ml of methyl ethyl ketone (MEK), 0.1 g to 0.2 g of polymer is dispersed or the soluble polymer fraction is dissolved. After 18 hours, the insoluble dispersed fraction was precipitated by centrifugation (25 000 rpm), the supernatant ...
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