| Effect of High Temperature Diesel Oil Immersion on Properties of NBR Vulcanizates |
| Received:May 19, 2020 Revised:May 19, 2020 |
| DOI：10.12136/j.issn.1000-890X.2022.02.0138 |
| Key Words: NBR；diesel oil；high temperature；immersion；swelling；cross-linking；molecular chain fracture；tensile property |
| Author Name | Affiliation | E-mail | | XIE Junfeng | Oil and Gas Engineering Research Institute of PetroChina Tarim Oilfield Company | xjf-tlm@petrochina.com.cn | | ZHANG Dongna* | 1. State Key Laboratory of Performance and Structural Safety for Petroleum Tubular Goods and Equipment Materials；2. CNPC Tubular Goods Research Institute | zhangdna@cnpc.com.cn | | GENG Hailong | Oil and Gas Engineering Research Institute of PetroChina Tarim Oilfield Company | | | CAI Xuehua | 1. State Key Laboratory of Performance and Structural Safety for Petroleum Tubular Goods and Equipment Materials，Xi’an；2. CNPC Tubular Goods Research Institute | | | KUANG Shengping | Oil and Gas Engineering Research Institute of PetroChina Tarim Oilfield Company | | | DING Nan | 1. State Key Laboratory of Performance and Structural Safety for Petroleum Tubular Goods and Equipment Materials；2. CNPC Tubular Goods Research Institute | | | Du Fenghui | Oil and Gas Engineering Research Institute of PetroChina Tarim Oilfield Company | |
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| Abstract: |
| The effects of high temperature diesel oil immersion on the properties of nitrile rubber（NBR）
vulcanizates were studied. The mass change rates，volume change rates，densities，physical properties and
glass transition temperatures of NBR vulcanizates that had been immersed in 120 ℃ 0# diesel oil（diesel oil
for short） for 0，7，14 and 28 d were tested. The results showed that，high temperature diesel oil immersion
had obvious effects on the properties of NBR vulcanizates. The tensile properties of NBR vulcanizates had
the large decrease. The tensile strength and elongation at break of the NBR vulcanizates immersed in diesel
oil for 28 d both decreased by more than 75%. In the early stage of immersing（0～7 d），the main change of
the NBR vulcanizates was swelling. As the immersion time continued to prolong（7～14 d），the main change
of the vulcanizates which affected the properties became the further cross-linking of the molecular chains. In
the late stage（14～28 d），the dominant change of the vulcanizates was NBR molecular chain fracture. |
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