Method for preparing porous mullite fiber through coaxial electrostatic spinning

A coaxial electrospinning, porous mullite technology, applied in the direction of inorganic raw material rayon, etc., can solve the problems such as no research reports on porous mullite fibers, and can reduce the preparation cost, reduce the synthesis temperature, and improve the insulation. The effect of thermal properties

Inactive Publication Date: 2017-06-20
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to technical bottlenecks such as precursor solution preparation and electrospinning process, there has been no research report on the preparation of porous mullite fibers by coaxial electrospinning.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] With 0.4g of anhydrous aluminum trichloride and 0.22ml of tetraethyl orthosilicate as the precursor, 0.49ml of isopropyl ether as the oxygen donor, and 15ml of anhydrous dichloromethane as the solvent to prepare the reaction solution, put the reaction solution in 100 ℃ oven for 1 h to obtain mullite xerogel. Measure absolute ethanol and polyvinylpyrrolidone (PVP molecular weight 1300000) according to the mass percentage of 93% and 7%, respectively, and mix them to obtain a PVP ethanol solution, and dissolve the above-mentioned mullite xerogel with a mass percentage of 4% in the mass percentage 82% PVP ethanol solution, then add 14% DMF by mass percentage to obtain mullite spinning precursor. Use liquid paraffin as the inner liquid, the flow rate of the inner liquid is 0.1ml / h, the mullite precursor spinning liquid is the outer liquid, the flow rate of the outer liquid is 1ml / h, and the spinning parameters are spinning voltage 15KV, and the curing distance is 15cm. Coax...

Embodiment 2

[0019] With 0.4g of anhydrous aluminum trichloride and 0.22ml of tetraethyl orthosilicate as the precursor, 0.49ml of isopropyl ether as the oxygen donor, and 15ml of anhydrous dichloromethane as the solvent to prepare the reaction solution, put the reaction solution in 100 ℃ oven for 1 h to obtain mullite xerogel. Measure absolute ethanol and polyvinylpyrrolidone (PVP molecular weight 1300000) according to the mass percentage of 95% and 5%, respectively, and mix them to obtain a PVP ethanol solution. The above-mentioned mullite xerogel with a mass percentage of 5% is dissolved in 85% PVP ethanol solution, then add DMF with a mass percentage of 10% to obtain a mullite spinning precursor. Use liquid paraffin as the inner liquid, the flow rate of the inner liquid is 0.2ml / h, the mullite precursor spinning liquid is the outer liquid, the flow rate of the outer liquid is 2ml / h, and the spinning parameters are spinning voltage 20KV, and the curing distance is 13cm. Coaxial electro...

Embodiment 3

[0021] Use 0.2g of anhydrous aluminum trichloride and 0.11ml of tetraethyl orthosilicate as the precursor, 0.25ml of isopropyl ether as the oxygen donor, and 7.5ml of anhydrous dichloromethane as the solvent to prepare a reaction solution, and put the reaction solution into Gelation treatment in an oven at 80°C for 2 hours to obtain mullite xerogel. Measure absolute ethanol and polyvinylpyrrolidone (PVP molecular weight 1300000) according to the mass percentage of 93% and 7%, respectively, and mix them to obtain a PVP ethanol solution, and dissolve the above-mentioned mullite xerogel with a mass percentage of 4% in the mass percentage 82% PVP ethanol solution, then add 14% DMF by mass percentage to obtain mullite spinning precursor. Use liquid paraffin as the inner liquid, the flow rate of the inner liquid is 0.3ml / h, the mullite precursor spinning liquid is the outer liquid, the flow rate of the outer liquid is 1.0ml / h, the spinning voltage is 17KV, and the curing distance is...

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Abstract

The invention relates to a method for preparing porous mullite fiber through coaxial electrostatic spinning and belongs to the science and technology technical field of materialsmaterial science. The fiber preparing method comprises the following steps: preparing anhydrous aluminum chloride, tetraethoxysilane, isopropyl ether and anhydrous dichloromethane into a reaction solution according to a certain molar ratio, then heating the reaction solution, triggering non-hydrolytic sol-gel reaction to synthesize mullite gel; mixing absolute ethyl alcohol and a certain amount of polyvinylpyrrolidone (PVP) according to a certain ratio to obtain a PVP ethanol solution, dissolving the synthesized mullite gel in the PVP ethanol solution, then adding N,N-dimethylformamide (DMF) to obtain a spinning precursor solution; taking liquid paraffin as an inner solution, taking the mullite precursor solution as an outer solution, preparing mullite gel / PVP composite fiber through a coaxial electrostatic spinning process, then calcining the mullite gel / PVP composite fiber under high temperature to obtain the porous mullite fiber. The preparation method of the porous mullite fiber is simple; the porous structure is easy to control; the porous mullite fiber has excellent heat insulation and heat preservation properties; a novel high-temperature heat insulation material is provided for the fields such as aviation and military industry and the like.

Description

technical field [0001] The invention belongs to the field of preparation of mullite fibers, in particular to a method for preparing porous mullite fibers by coaxial electrospinning. Background technique [0002] Mullite (3Al 2 o 3 2SiO2 2 ) fiber is considered to be an excellent ceramic material because of its excellent high temperature strength, high temperature creep resistance, thermochemical stability, low thermal expansion coefficient and good dielectric properties. The use temperature of mullite fiber is as high as 1500 ℃, and the tensile strength is about 2.1GPa, which is the same as that of A1 2 o 3 Fiber quite. At the same time, it also has better oxidation resistance than carbon and silicon carbide fibers. Therefore, mullite fibers are widely used in metallurgy, aerospace instrument insulation, and reinforcement of composite materials. [0003] At present, mullite fibers are usually prepared by micropowder extrusion method, centrifugal spinning method, pullin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/08
CPCD01F9/08
Inventor 魏恒勇崔燚王鹏季文玲李慧魏颖娜卜景龙杨金萍陈越军桑榕栎陈颖董桂霞
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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