Method for preparing composite film by adding amine-doped titanium dioxide nanowires to relieve porosity and permeability

By introducing amination-modified titanium dioxide nanowires into the composite membrane coating solution to form a network structure, the problems of increased separation layer thickness and defects caused by pore seepage were solved, realizing the preparation of ultrathin and defect-free CO2 separation composite membranes, improving gas separation performance and reducing costs.

CN116889803BActive Publication Date: 2026-07-10TIANJIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TIANJIN UNIV
Filing Date
2023-07-07
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

During the preparation of composite membranes, the pore permeation phenomenon leads to an increase in the thickness of the separation layer and an increase in gas transmission resistance. Furthermore, when the concentration of the coating solution is low, defects are prone to appear in the separation layer, affecting the gas separation performance.

Method used

Adding ammoniated titanium dioxide nanowires to the separation layer coating solution enhances viscosity and interfacial interaction by forming a network structure, preventing the coating solution from penetrating into the support pores and preparing an ultrathin, defect-free separation layer.

Benefits of technology

This effectively alleviates the porosity problem, produces a defect-free composite membrane with a thickness of less than 100 nm, improves CO2 separation performance, and reduces material costs.

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Abstract

The present application relates to the preparation of composite membrane by adding amine titanium dioxide nanowires to relieve pore penetration; the composite membrane is prepared by synthesizing TiO2-NH2 nanowires, configuring coating solution, and scraping the separation layer. The addition of TiO2-NH2 nanowires slightly increases the viscosity of the coating solution; the polyvinylamine and TiO2-NH2 nanowires in the coating solution form a crosslinked network structure through hydrogen bonds, which acts as a scaffold, making it difficult for the solution to penetrate into the pores of the support. The density of TiO2-NH2 nanowires is greater than that of the solution, and during the drying process of the separation layer, the nanowires and the polyvinylamine crosslinked with the nanowires first reach the surface of the support, and the network structure formed by the polyvinylamine and TiO2-NH2 nanowires can relieve the further penetration of the solution into the pores of the support. The composite membrane has a CO2 / N2 separation factor of 63-72 under a feed gas pressure of 0.5 MPa. The present application is simple to operate and easy to scale up the production of ultra-thin defect-free composite membranes.
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