A hydrophilic nanoparticle aggregation-modified microporous moisture transfer film material and a method for preparing the same

By in-situ polymerization of dopamine derivatives in moisture transfer membrane materials to form hydrophilic nanoparticle aggregates, the problems of insufficient permeability and barrier properties of traditional membrane materials are solved, achieving efficient water vapor transfer and gas isolation effects.

CN122321653APending Publication Date: 2026-07-03DALIAN UNIV OF TECH
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Patent Information

Application Number
CN202610444502.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-07
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing moisture transfer membrane materials have shortcomings in balancing water vapor permeability and gas barrier properties, especially traditional dense skin materials which have low water vapor permeability and poor gas barrier properties due to their microporous structure.

Method used

By in-situ polymerization of dopamine and its derivatives in microporous moisture transfer membrane materials, hydrophilic nanoparticle aggregates with a diameter of less than 5.0 nm are formed, which improves the hydrophilicity of the pores and reduces the pore size. At the same time, a rough hydrophilic modification layer is formed on the surface of the membrane material, which enhances the water vapor permeation and barrier properties.

Benefits of technology

It significantly improves the gas barrier performance and water vapor permeation performance of microporous moisture transfer membrane materials, with a water vapor permeation rate of 7300 GPU and an oxygen permeation rate reduced to 1.3 GPU, and performance stability exceeding 8000 hours.

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Abstract

This invention belongs to the fields of chemistry and chemical engineering, and discloses a microporous moisture transfer membrane material modified with hydrophilic nanoparticles and its preparation method. Dopamine or its derivatives are used in a confined polymerization process within a microporous structure to form hydrophilic nanoparticle aggregates with a diameter less than 5 nanometers, which can induce capillary condensation of water vapor. This synergistically improves the water vapor permeability and gas barrier properties of the moisture transfer membrane material. Simultaneously, a hydrophilic modification layer with a roughness between 10.0 and 30.0 nanometers is polymerized on the membrane material surface to enhance the membrane material's ability to capture gaseous water molecules, thereby strengthening the water vapor permeability. The microporous moisture transfer membrane material prepared according to the technical solution of this invention achieves a water vapor permeation rate of 7300 GPU in a saturated humid air environment at 80 °C, while the oxygen permeation rate is only 1.3 GPU. Long-term testing shows that the water vapor permeability and gas barrier properties can remain stable for over 8000 hours.
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