Flexible inorganic fiber material and its preparation method

Abstract

The invention relates to a flexible inorganic fiber material and a preparation method thereof. Firstly, at least one metal source is dissolved in a solvent, and a coupling agent and a surfactant are added in sequence and uniformly mixed to form a uniform and stable precursor solution. The precursor There are interpenetrating three-dimensional network molecular chains in the solution; then the above precursor solution is made into a precursor fiber material through a spinning molding process; the above precursor fiber material is calcined in a suitable atmosphere to obtain a flexible inorganic fiber material. The present invention can prepare a variety of inorganic fiber materials through different spinning processes, the preparation process is simple, the yield is high, and the prepared inorganic fiber materials have good flexibility, and are widely used in many fields such as catalysis, energy, electronics, filtration, and heat insulation. with broadly application foreground.

Description

Technical field [0001] The invention belongs to the technical field of new materials, and relates to a flexible inorganic fiber material and a preparation method thereof, and in particular to a flexible inorganic fiber material with a precursor solution of interpenetrating three-dimensional network structure molecular chains as a spinning solution and a preparation method thereof. Specifically, fiber materials such as flexible metal oxides, metal nitrides, and metal sulfides and preparation methods thereof. Background technique [0002] Inorganic fiber is a kind of chemical fiber made from minerals, mainly including glass fiber, quartz fiber, ceramic fiber, asbestos fiber, basalt fiber, metal fiber, etc. It is widely used in daily production and life. The products can be used in electronic appliances, transportation, chemical engineering, construction engineering, heat insulation and sound absorption, environmental protection, aerospace and military industries. At present, scien...

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Problems solved by technology

At present, researchers have developed inorganic fiber materials using a variety of processes. While inorganic fibers have excellent properties, they also have problems such as high brittleness and poor mechanical properties, which greatly limit their practical applications.

[0003] Chinese patent CN200680032324 discloses a method for manufacturing a flexible ceramic composition, which uses sol-gel ceramic components and polymer components to mix electrospinning to produce flexible ceramic fibers. Chinese patent CN201310223225.9 discloses a silicon oxide / titanium oxide The preparation method of composite mesoporous flexible non-woven fiber membrane, however, these two patents need to add polymer in the preparation process of flexible ceramic fiber, not only the preparation process is complicated, but also the content of ceramic components in the hybrid fiber is low, resulting in the production of ceramic fiber after calcination low rate

These patents and articles all use sol-gel technology without adding polymers and surfactants. However, these methods require a long aging time during the preparation of the precursor solution, and the prepared fibers have poor uniformity in diameter and are prone to Fracture, unable to obtain flexible ceramic nanofibers

Catalysis Today 225(2014) 10-17 reported the preparation of mesoporous SiO by electrospinning technology 2 / TiO 2 Nanofibers, Journal of Colloid and Interface Science355 (2011) 328-333 reported the use of electrospinning technology to prepare porous Fe 2 o 3 / TiO 2 Nanofibers, these methods do not add polymers and surfactants, improve the spinnability of the precursor solution through aging, and prepare porous ceramic nanofibers. However, the fibers prepared by these methods have poor diameter uniformity, poor continuity, Problems such as single fiber defects make the fiber brittle, and it is impossible to obtain flexible ceramic nanofibers

Journal of Colloid and Interface Science 424 (2014) 49-55 and Ceramics International 38 (2012) 883-886 reported that flexible inorganic fibers were obtained by electrospinning by adding a coupling agent and a polymer to prepare a precursor solution. Both articles were prepared Flexible inorganic fibers are obtained, but the content of inorganic components in the hybrid fibers is low, resulting in extremely low yield of inorganic fibers

Chinese patent CN201310102036.6 discloses a N / Si co-doped TiO 2 The preparation method of fiber, this method adopts one-step synthetic method to prepare organotitanium, mixes with coupling agent, then concentrates to obtain spinning solution, and adopts centrifugal spinning to obtain precursor short fiber, although this method has prepared TiO 2 Short fibers, but this method needs aging to improve spinnability, the process is very complicated, and the prepared fibers have poor continuity, and flexible inorganic fibers cannot be obtained

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