Preparation method of high temperature resistant silicon dioxide nanometer fiber filtering membrane

A silicon dioxide and nanofiber technology, applied in the field of fiber materials, can solve the problems of large fiber diameter, complex preparation process, poor high temperature resistance, etc., and achieve the effects of simple preparation method, optimized preparation process and low cost

Inactive Publication Date: 2012-09-05
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a high-temperature-resistant silica nanofiber filter membrane for the shortcomings of the existing high-temperature soot filter materials, so as to solve the problems of large fiber diameter, poor high-temperature resistance, and complicated preparation process of the above-mentioned materials. technical problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] At room temperature, weigh 10g of tetraethoxysilane, 15g of deionized water, 15g of ethanol with a mass concentration of 99.7%, and 0.05g of phosphoric acid with a mass concentration of 85.0% and add them to the stirred tank at a mass ratio of 1:1.5:1.5:0.005 Obtain a mixed solution, stir with a magnetic stirrer at a speed of 20rpm for 2h, then add 2.00g of sodium chloride, the mass fraction of inorganic salt in the solution is 5%, at 60°C, stir with a magnetic stirrer at a speed of 20rpm 2h, make it aged to obtain a precursor sol with a viscosity of 100Pa·S and a conductivity of 35mS / m; at room temperature, under the condition of a relative humidity of 30%, input the precursor sol to the static electricity at a flow rate of 0.5mL / h On the spinneret of the spinning equipment, the receiving device is aluminum foil, and the distance between the receiving device and the spinneret is 30cm. At the same time, the spinneret is connected to a 30kV high-voltage power supply for e...

Embodiment 2

[0025] At room temperature, weigh 15g of tetrapropoxysilane, 15g of deionized water, 15g of ethanol with a mass concentration of 99.7%, and 0.15g of nitric acid with a mass concentration of 65.0% and add them to the stirred tank at a mass ratio of 1:1:1:0.01 Obtain a mixed solution, stir with a magnetic stirrer at a speed of 120rpm for 3h, then add 0.90g lithium chloride, the mass fraction of inorganic salt in the solution is 2%, at 60°C, use a magnetic stirrer at a speed of 150rpm Stir for 3 hours to make it aged to obtain a precursor sol with a viscosity of 450Pa·S and a conductivity of 22mS / m; at room temperature, under the condition of a relative humidity of 40%, input the precursor sol into the static electricity at a flow rate of 1mL / h On the spinneret of the spinning equipment, the receiving device is aluminum foil, and the distance between the receiving device and the spinneret is 15cm. At the same time, the spinneret is connected to an 18kV high-voltage power supply fo...

Embodiment 3

[0028] At room temperature, weigh 20g of methyltriethoxysilane, 16g of deionized water, 24g of ethanol with a mass concentration of 99.7%, and 0.16g of acetic acid with a mass concentration of 99.5% in a mass ratio of 1:0.8:1.2:0.008 to stir The mixed solution was obtained in the still, and after stirring for 4 hours at a rotating speed of 150rpm with a magnetic stirrer, 0.015g sodium chloride and 0.045g calcium chloride were added, the mass ratio of the two was 1:3, and the mass fraction of inorganic salt in the obtained solution was 0.1%, at 60°C, stir with a magnetic stirrer at a speed of 90rpm for 6h to age to obtain a precursor sol with a viscosity of 700Pa·S and an electrical conductivity of 18mS / m; at room temperature, at a relative humidity of 45% Under the conditions of , the precursor sol is input to the spinneret of the electrospinning equipment at a flow rate of 2mL / h, the receiving device is a copper mesh, and the distance between the receiving device and the spinn...

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PUM

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Abstract

The invention provides a preparation method of a high temperature resistant silicon dioxide nanometer fiber filtering membrane. The preparation method is characterized by comprising the specific steps of: adding organosilicone, water, ethanol and inorganic acid at room temperature into a stirring kettle so as to obtain a mixed solution, and adding inorganic salt; stirring the mixed solution so as to obtain a precursor colloidal sol; inputting the precursor colloidal sol in a spinning head of electrostatic spinning equipment, simultaneously wherein the spinning head is connected with a high-voltage power supply so as to carry out electrostatic spinning to obtain the nanometer fibrous membrane; placing the nanometer fibrous membrane into a vacuum drying chamber to dry, then placing into a box resistance furnace to carry out warming for calcination, namely obtaining the high temperature resistant silicon dioxide nanometer fiber filtering membrane. The preparation method provided by the invention has the advantages that the preparation process is simple, the cost is cheap, the fiber diameter of the acquired high temperature resistant silicon dioxide nanometer fiber filtering membrane is small, the fire resisting quality is good, and the high temperature resistant silicon dioxide nanometer fiber filtering membrane has good structural stability; and the filter efficiency of high temperature smoke dust particles the sizes of which are more than 0.24 mum achieves 99.9% at 1500 DEG C, and the high temperature resistant silicon dioxide nanometer fiber filtering membrane has extensive application prospects in the fields such as high-temperature insulation, individual protection, and aerospace.

Description

technical field [0001] The invention relates to a preparation method of a high-temperature-resistant silica nanofiber filter membrane, which belongs to the technical field of fiber materials. Background technique [0002] With the rapid development of my country's industry and the continuous progress of society, people's living standards are improving day by day, it is particularly important to protect the environment and improve the air quality that people rely on for survival. Air pollution caused by high-temperature smoke and dust emitted by industries such as metallurgy, iron and steel, power generation, and cement is becoming more and more serious. Effective filtering of 500-1000°C high-temperature smoke and dust generated by these industries will be one of the measures to improve air quality. At present, the commonly used air filter materials mainly include sulfone fiber, aramid fiber, polyphenylene sulfide fiber, glass fiber, etc., but they cannot directly filter high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D69/12B01D67/00
Inventor 丁彬杨丽萍毛雪俞建勇孙刚
Owner DONGHUA UNIV
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