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| Advances in ductile sealing materials and gas permeability of artificial cavern gas storage |
| HAO Meimei1,2, YANG Wenjing1,2, PENG Cen1,WEI Liuhe3, DUAN Hongyu4, LI Xiaolong1,2, LI Yuhan3, ZHONG Yanhui1,2 |
(1. School of Water Conservancy and Transportation, Zhengzhou University, Zhengzhou, Henan 450001, China; 2. State Key Laboratory of Tunnel Boring Machine and Intelligent Operations, Zhengzhou, Henan 450001, China; 3. School of Chemical Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China; 4. Department of Sustainable Development,
Environmental Science and Engineering, KTH Royal Institute of Technology, Stockholm 10044, Sweden) |
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Abstract The sealing layer materials utilized in underground gas storage facilities are crucial for their effective operation. This study analyzes the impact of isophorone diisocyanate (IPDI) content on the mechanical properties of polyurethane to identify its optimal concentration. Additionally, we developed equipment to test breakdown pressure and gas permeability, enabling an investigation into the breakdown pressure, failure modes, and high-pressure gas permeability of the modified polyurethane material. Furthermore, we examined the effects of constant high temperature and thermal cycling on the gas tightness of the modified polyurethane. The results indicate that both the tensile and compressive strengths of polyurethane decrease as the IPDI content increases. When the IPDI content reaches 19.34%, the material exhibits favorable comprehensive mechanical properties and toughness, meeting the requirements for the sealing layer in artificial caverns used for gas storage. The modified polyurethane material did not fail during the breakdown pressure test, achieving a gas permeability of 7.931×10－13 cm3 STP·cm·(cm²·s·cmHg)?¹, which is approximately one-thousandth of the permeability of conventional sealing materials. When the temperature exceeds 40 ℃, the gas permeability of this modified polyurethane material increases with rising temperature; however, it continues to maintain satisfactory sealing performance.
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2025, Vol. 44 
