Method for preparing mullite porous hollow microspheres by electrostatic spinning technology

By employing coaxial electrospinning technology and high-temperature calcination, the preparation challenges of porous and hollow mullite microspheres have been solved, enabling controllable preparation and performance improvement of porous core-shell structures, which are suitable for photocatalysis and aerospace applications.

CN121698671APending Publication Date: 2026-03-20BEIJING UNIV OF CHEM TECH
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Patent Information

Application Number
CN202512029506.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-30
Publication Date
2026-03-20

AI Technical Summary

Technical Problem

Existing technologies cannot simultaneously prepare mullite microspheres with porous and hollow structures, and existing methods suffer from problems such as shell rupture, uneven pore structure distribution, and impurity residue.

Method used

Using coaxial electrospinning technology, different polymer solutions were added to the inner and outer channels of the coaxial needle, and the spinning process parameters and environmental humidity were adjusted to prepare porous core-shell mullite precursor microspheres. The mullite porous hollow microspheres were then formed by curing, crosslinking and high-temperature calcination.

Benefits of technology

The controllable fabrication of porous core-shell structures has been achieved, forming a uniform internal interconnected pore or bubble structure, resulting in low-density, lightweight, and high-temperature resistant mullite porous hollow microspheres suitable for photocatalysis and aerospace applications.

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Abstract

The invention relates to the field of preparation of mullite materials, in particular to a method for preparing mullite porous hollow microspheres by an electrostatic spinning technology. The method for preparing the mullite porous hollow microspheres by the electrostatic spinning technology comprises the following steps: mixing an inner-layer polymer with a first solvent to obtain an inner-layer polymer solution; mixing the mullite precursor with a second solvent to obtain an outer layer polymer solution; performing electrostatic spinning on the inner-layer polymer solution and the outer-layer polymer solution by adopting a coaxial electrostatic spinning technology to obtain precursor microspheres; carrying out curing heat treatment on the precursor microspheres to obtain cured and crosslinked precursor microspheres; calcining the cured and crosslinked precursor microspheres, so as to obtain mullite porous hollow microspheres; wherein the humidity of the electrostatic spinning is 30-60%. According to the invention, the porous structure and hollow structure combined mullite microspheres are prepared by adopting an electrostatic spinning technology, and a new method is provided for preparation of the porous hollow mullite microspheres.
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