Abstract: A method for manufacturing a nitrile butadiene rubber includes: subjecting a material composition containing water, butadiene, acrylonitrile, an emulsifying agent, an initiator, and a molecular weight regulator to an emulsion polymerization reaction, so as to form an emulsion; and adding a reactive antioxidant and a non-reactive antioxidant to the emulsion to form a mixture, followed by subjecting the mixture to a coagulation process, so as to form the nitrile butadiene rubber.

Abstract: An isolation device for oil circuit contains a first clamper and the second clamper which include a first clamping portion and a second clamping and two grip portions; the first clamping portion having a first plug and a notch; the second clamper being located at a recess of the notch, and the recess having a post extending upwardly, the post having a groove formed therein for inserting a fixing member, a disc, a compression spring, and a washer, the fixing member being received in the recess of the second clamper and having a plurality of ribs, the disc having a plurality of slots; the disc having a first cutout, a second cutout, and a third cutout provided in an array arrangement, wherein the first cutout, the second cutout, and the third cutout are in different sizes, and the disc also having a second plug in different sizes.