Hecheng xiangjiao gongye (Mar 2024)
"Analysis of factors affecting resistance of nitrile rubber to petroleum exploitation medium"
Abstract
The effects of bound acrylonitrile content, curing system, reinforcing system and plastici-zing system on the corrosion resistance of nitrile rubber (NBR) to common chemical media in the field of petroleum exploitation were studied. The results showed that with the increase of bound acrylonitrile content, the physical and mechanical properties and thermal air aging resistance of NBR vulcanizates increased, the resistant to non-polar media such as kerosene and submarine control fluid was better, the resistance to methanol, distilled water and ethylene glycol aqueous solution decreased gradually, and the resistant to acid, alkali and brine had little diffe-rence. The curing system affected mainly the physical and mechanical properties and heat air aging resistance of NBR vulcanizates, and had little effect on the resistance of NBR vulcanizates to various petroleum exploitation media. For the high hardness NBR vulcanizates, the physical and mechanical properties of the vulcanizates were the best when small particle size carbon black was used as reinforcing system, and the effect of different reinforcing system on the heat air aging resistance of NBR vulcanizates was not obvious. However, the vulcanizates had better resistance to methanol and kerosene when large particle size carbon black was used as a reinforcing filler, and inert reinforcing filler should be selected. The physical and mechanical properties of NBR vulca-nizates added with macromolecule ester plasticizer were better than those with small molecule ester plasticizers and liquid NBR plastici-zer, and the heat air aging properties were similar, but the volume change of resistance to various media was larger, and the resistance to methanol, kerosene and 10% sodium hydroxide solution were poor, while the resistance to other petroleum exploitation media were less affected.
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