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XNBRCarboxylated Nitrile Rubber
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The compounding formulation for the carboxylated nitrile rubber and natural rubber blends with its various ingredients were mixed in a two roll mill at a friction ratio of 1:2 following standard mixing sequence.
in phr) Ingredients MC-1 MC-2 MC-3 Carboxylated nitrile rubber (XNBR) 80 50 20 Natural rubber (NR) 20 50 80 Carbon black 40 40 40 Stearic acid 2 2 2 Process oil-Elasto 710 2 2 2 Antioxidant (HQ) 1 1 1 Sulfur 1 1 1 Accelerator (CBS) 0.7 0.7 0.7 Activator (ZnO) 5 5 5
Carboxylated nitrile rubber (XNBR) (Krynac X7.4, carboxyl content 6.9%, ML (1 + 4) 100[degrees]C: 39) was obtained from Polysar, USA.
To counter the problems inherent in the earlier XHNBR process, Bayer has developed a method for selectively hydrogenating a carboxylated nitrile rubber so that only hydrogenation of the C=C double bonds occurs.
An exploratory study of various magnesias and magnesium hydroxide in carboxylated nitrile rubber showed that, in this system, magnesium hydroxide appeared to function as a very low activity magnesium oxide with respect to vulcanizate properties [ref.
This grade is specifically designed to improve the scorch time of carboxylated nitrile rubbers relative to standard zinc oxide, according to the company's one-page technical bulletin.
(103) The effect of vulcanization systems on bin storage stability, physical and cure properties of carboxylated nitrile rubbers. Gregory Blackmon, Bayer Polymers of America, and Rayner B.