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Nitrile butadiene rubber.

Nitrile butadiene rubber (NBR) grades with acrylonitrile (ACN) content from 17% to 40% and viscosity from 35 to 120 Mooney units are available. Grades with lower ACN content (17-20%) are said to have higher low-temperature resistance with high physical and mechanical performance preserved, which is said to be necessary for making industrial rubber items operated at low temperatures. To improve the set of properties, including higher low-temperature resistance and better processability, rubbers are filled with various plasticizers. Most plasticizers are esters. Out of the total number of commercial plasticizers, 70-75% are phthalic, adipic and sebacic esters. The most common plasticizers include butyl alcohol and sebacic acid ester, or dibutylsebacate (DBS), dibutylphthalate (DBP), dioctyl phthalate (DOP) and ester based on synthetic fatty monocarbonic acids of the [C.sub.5]-[C.sub.9] fraction and diethylene glycol (LZ-7). A unique technology has been designed for modifying nitrile butadiene rubber at the latex stage, which implies adding DBEA in the emulsion to form to the polymer at the latex stage before coagulation. (OJSC Sibur Holding)

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Title Annotation:Suppliers Showcase: Materials
Publication:Rubber World
Date:Nov 1, 2012
Words:175
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