A gas separation membrane and a method of making the same

By introducing polyaniline-coated carbon nanotubes and mesoporous silica into the gas separation membrane, an inorganic-organic interpenetrating network is formed, which solves the problem of insufficient mechanical properties after adding titanium dioxide and achieves a synergistic improvement in high air permeability and high fracture strength.

CN122164247APending Publication Date: 2026-06-09LINGGAS MATERIALS TIANJIN LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
LINGGAS MATERIALS TIANJIN LTD
Filing Date
2026-05-12
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In the prior art, although increasing the titanium dioxide content improves the gas permeability of the gas separation membrane, its mechanical properties (such as fracture strength) need to be improved.

Method used

By simultaneously introducing polyaniline-coated carbon nanotubes and mesoporous silica into the gas separation membrane, an inorganic-organic interpenetrating network is formed, which enhances the interfacial strength of the composite membrane and improves its mechanical properties through hydrogen bonding and covalent bonding, while maintaining high air permeability.

Benefits of technology

This achieves a synergistic improvement in the high H2 permeability and tensile strength of the composite membrane, ensuring the membrane's efficient gas separation performance and mechanical stability.

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Abstract

This invention belongs to the field of membrane material preparation technology. This invention provides a gas separation membrane and its preparation method. The method comprises the following steps: S1, preparing a 10% (w / w) polyimide solution using N-methylpyrrolidone; S2, mixing 1.4-1.6 parts by weight of mesoporous silica, 1.7-1.9 parts by weight of polyaniline-coated carbon nanotubes, and 65-67 parts by weight of 15 wt% nano-titanium dioxide sol to obtain a mixture; S3, adding the mixture obtained in S2 dropwise to 860-870 parts by weight of the polyimide solution obtained in S1 under stirring, stirring at room temperature for 24-26 hours, filtering, degassing, forming a membrane, drying under reduced pressure, boiling in water to remove the membrane, and drying again to obtain the gas separation membrane. This invention maintains a high addition amount of inorganic particles to ensure excellent gas permeability (hydrogen permeability coefficient) of the composite membrane while further improving its mechanical properties (tensile strength).
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