|
| Effect of Acidic Medium on Aging Behavior of Rubber Materials in Salt Fog Environment |
| Received:November 12, 2018 Revised:April 25, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2019.04.014 |
| KeyWord:rubber SO2- salt spray dilute sulfuric acid - salt spray aging |
| Author | Institution |
| LI Gang |
Aviation Industry Corporation of China, Beijing , China |
| LI Ming |
Aviation Industry Corporation of China, Beijing , China |
| ZHU Jin-yang |
Aviation Industry Corporation of China, Beijing , China |
| ZHU Meng |
Aviation Industry Corporation of China, Beijing , China |
|
| Hits: |
| Download times: |
| Abstract: |
| Objective To study the effect of SO2 and dilute sulphuric acid on aging behaviors of rubber materials under salt spray environment. Methods With SO2 and dilute sulfuric acid as acid medium, SO2- salt spray and dilute sulfuric acid salt spray test were carried out with ethylene propylene rubber and butadiene-acrylonitrile rubber as the test objects. The aging effects of the two acidic media on the rubber materials were analyzed by means of macroscopic morphology observation and tensile property test, combined with SEM and FTIR. Results After exposure to SO2- salt spray for 48h, the surface of EPDM changed from purple to light blue; after exposure for 12 days, the surface appeared dense shedding pit and long strip pulverization, with the content of methylene content decreased slightly and the absorption peak of the residual double bond in the third monomer disappeared. After 12 days of exposure in the SO2- salt spray environment, the retention rate of tensile strength of NBR decreased to 75% with the amide bond and methylene content in the polymer decreased significantly. Conclusion The damage caused by SO2- salt spray test on rubber material is more intense. The loss rate of tensile strength of NBR exposed for 12 days is 14.39% higher than that under dilute sulfuric acid -salt spray environment. SO2 accelerates the precipitation and exfoliation process of filler particles in rubber, resulting in defects such as discoloration and shedding of rubber surface and the tensile properties of rubber materials reduced. |
| Close |
|
|
|