| Formula Design of Internal Elastomer Compound for Flexible Joint of Marine Transportation Pipeline |
| Received:August 22, 2021 Revised:August 22, 2021 |
| DOI：10.12136/j.issn.1000-890X.2023.02.0123 |
| Key Words: flexible joint；elastomer；NBR；marine transportation pipelines；orthogonal test |
| Author Name | Affiliation | | MA Meiqin | Sino Rubber Technology Co. Ltd | | LIU Baoquan | Sino Rubber Technology Co. Ltd | | YIN Ting | Sino Rubber Technology Co. Ltd | | SHI Chengang | Sino Rubber Technology Co. Ltd | | SUN Jianbang | Sino Rubber Technology Co. Ltd |
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| Abstract: |
| The formula design of internal elastomer compound for the flexible joint of the marine
transportation pipeline was studied. The rubber[nitrile butadiene rubber （NBR）]，reinforcing filler，
plasticizer，sulfur and accelerator of the compound were analyzed through the orthogonal test，and the
optimized formulation was determined as follows：the amount of NBR6240 and 6280 was 60 and 40 phr，
respectively，the amount of carbon black N330 was 55 phr，the amount of carbon black N550 was 12 phr，the
amount of dioctyl adipate was 7 phr，and the amount of sulfur and accelerator was 1. 8 phr（sulfur，accelerator
CBS and accelerator TMTD dosages were 0. 3，1 and 0. 5 phr，respectively）. The tensile strength of the
optimized NBR compound reached 22. 6 MPa，and the change rates（absolute value，same after） of the tensile
strength and elongation at break after seawater aging and the change rate of the volume after oil immersion
were small. The performance of the optimized compound met the performance requirements of the internal
elastomer for flexible joints. |
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