Dual confinement composite moisture absorbing material, and preparation method and application thereof

By constructing a hierarchical core-shell structure on a porous support framework, a dual-confined composite hygroscopic material was developed, which solved the problems of deliquescence leakage and high desorption energy barrier of inorganic hygroscopic salts. This achieved low-temperature, high-efficiency moisture desorption and zero leakage, expanding its applications in atmospheric water collection and low-temperature thermal energy utilization.

CN122164376APending Publication Date: 2026-06-09SOUTHEAST UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTHEAST UNIV
Filing Date
2026-04-30
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Inorganic hygroscopic salts are prone to leakage after deliquescence and have a high desorption energy barrier, making it difficult to efficiently desorb moisture at low temperatures, which limits the practical application of atmospheric water collection equipment.

Method used

By employing a dual-confined composite hygroscopic material, a hierarchical core-shell structure is formed by in-situ loading a two-dimensional metal-organic framework material and a polymer containing electron-rich functional groups onto a porous support skeleton. This synergistically encapsulates inorganic hygroscopic salts, constructing a multi-shell electronically shielded microenvironment that weakens Coulomb electrostatic attraction and blocks liquid phase leakage.

Benefits of technology

It achieves low-temperature, high-efficiency moisture desorption and zero leakage, solves the problems of deliquescence and high desorption energy consumption of inorganic hygroscopic salts, and expands the application prospects of atmospheric water collection and low-temperature thermal energy utilization.

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Abstract

This invention relates to a dual-confined composite hygroscopic material, its preparation method, and its application. The material includes a porous support framework, a first confinement layer in situ loaded within the pores of the porous support framework, an inorganic hygroscopic salt anchored within the first confinement layer, and a second confinement layer coating the porous support framework and the outer side of the phase interface. The first confinement layer is a two-dimensional metal-organic framework material; the second confinement layer is a polymer containing electron-rich functional groups. Compared with existing technologies, the composite hygroscopic material polymer provided by this invention can effectively construct a multi-shell electronically shielded microenvironment around the inorganic hygroscopic salt cations, completely blocking leakage of the deliquescent liquid phase while significantly weakening the electrostatic binding of water molecules by the inorganic salt cations. This achieves significant leak-proof and low-temperature, high-efficiency water desorption effects, and can be extended to solve the problems of high desorption energy consumption and deliquescent leakage of other inorganic hygroscopic salts.
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