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| Influence of Multi-factor Coupling on Aging Characteristics of Sealing Rubber |
| Received:March 26, 2024 Revised:May 10, 2024 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2024.05.015 |
| KeyWord:sealing rubber hot oil compression hot air compression hot air accelerated aging aging mechanism |
| Author | Institution |
| XUE Meifang |
a.Guangdong Provincial Key Laboratory of Environment Adaptability Evaluation and Testing Technology for Polymeric Materials, b.State Key Laboratory of Environmental Adaptability for Industrial Products, China National Electric Apparatus Research Institute Co., Ltd., Guangzhou , China |
| LYU Tianyi |
a.Guangdong Provincial Key Laboratory of Environment Adaptability Evaluation and Testing Technology for Polymeric Materials, b.State Key Laboratory of Environmental Adaptability for Industrial Products, China National Electric Apparatus Research Institute Co., Ltd., Guangzhou , China |
| TAO Youji |
a.Guangdong Provincial Key Laboratory of Environment Adaptability Evaluation and Testing Technology for Polymeric Materials, b.State Key Laboratory of Environmental Adaptability for Industrial Products, China National Electric Apparatus Research Institute Co., Ltd., Guangzhou , China |
| ZHAO Xueru |
a.Guangdong Provincial Key Laboratory of Environment Adaptability Evaluation and Testing Technology for Polymeric Materials, b.State Key Laboratory of Environmental Adaptability for Industrial Products, China National Electric Apparatus Research Institute Co., Ltd., Guangzhou , China |
| PENG Duncheng |
CVC Testing Technology Co., Ltd., Guangzhou , China |
| XU Zhiyou |
CVC Testing Technology Co., Ltd., Guangzhou , China |
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| Abstract: |
| The work aims to explore the aging laws and characteristics of a certain sealing rubber material under in-service conditions and conduct accelerated aging tests with multiple factors combined, including static loads, temperature, and medium. Three types of aging conditions (90 ℃ hot air, 90 ℃ hot air compression, 90 ℃ hot oil compression) were designed to simulate the actual service environment for laboratory-accelerated research. The changes in macroscopic properties such as mass, hardness, and compression set before and after aging were studied. The aging characteristics were studied combined with changes in its chemical structure and microscopic morphology. Under the aging conditions of hot oil compression, the mass of rubber increased with time, the hardness decreased, the compression permanent deformation increased, the thermal stability deteriorated, and the chemical structure changed slightly; Under the condition of hot air compression, the compression permanent deformation increased, while other physical and chemical properties showed minimal changes; Whereas under the pure hot air condition, the hardness increased, the alkyl content decreased, and other changes were minor. Results from scanning electron microscope showed that granular substances and striated textures appeared on the surface of rubber samples under both compression conditions. These results illustrated that oil could penetrate into the rubber causing softening while isolating external oxygen; Hot air medium accelerated thermal-oxidative aging and material hardening in the rubber, And the compression conditions inhibited the thermo-oxidative aging while accelerating the physical aging processes such as stress relaxation. The primary aging reactions of sealing rubber under different service environments are not consistent. Under the hot air condition, the degradation of rubber properties is closely related to the chemical aging process such as thermo-oxidative aging. However, when immersed in oil medium with compression states, the deterioration of rubber performance is more associated with physical aging effects. |
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