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An electrospinning sio 2 Nanofiber airgel thermal insulation material and its preparation and application

A technology of nanofibers and thermal insulation materials, which is applied in fiber processing, textile and papermaking, filament/thread forming, etc. The effect of good structure adjustability, good uniformity and convenient production process

Active Publication Date: 2021-02-09
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN107151020A provides a method for preparing silica airgel composites by freeze-drying method, but fiber felt is still used as filler material in the inorganic sol precursor in the above-mentioned method, and the addition of fiber felt not only makes airgel The density of the fiber increases, and it is difficult for the material to reflect the advantages and functional properties of the fiber structure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]Step 1: Weigh 2g of polyvinyl alcohol, dissolve it in 18g of deionized water, heat and stir at 80°C for 10 hours to obtain a 10wt% polyvinyl alcohol solution; ethyl orthosilicate / oxalic acid / deionized water in mass ratio Mix for 1 / 0.01 / 11, stir at room temperature for 12 hours to obtain the ethyl orthosilicate solution; mix the ethyl orthosilicate solution / polyvinyl alcohol solution at a mass ratio of 1 / 1, and stir at room temperature for 12 hours to obtain the precursor Body solution. Then the obtained precursor solution is injected into the syringe of the electrostatic spinning equipment, and the film is prepared by the electrostatic spinning equipment; the spinning temperature is 25°C, the spinning solution advance rate is 1ml / h, the spinning voltage is 20kV, and the spinning The distance between the wire needle and the receiving plate is 20cm, and the humidity is 30%;

[0036]The second step: Expose the obtained nascent fiber membrane to the air for 24 hours to fully volatili...

Embodiment 2

[0041]Step 1: Weigh 2g of polyvinyl alcohol, dissolve it in 18g of deionized water, heat and stir at 80°C for 10 hours to obtain a 10wt% polyvinyl alcohol solution; ethyl orthosilicate / oxalic acid / deionized water in mass ratio Mix for 1 / 0.01 / 11, stir at room temperature for 12 hours to obtain the ethyl orthosilicate solution; mix the ethyl orthosilicate solution / polyvinyl alcohol solution at a mass ratio of 1 / 1, and stir at room temperature for 12 hours to obtain the precursor Body solution. Then the obtained precursor solution is injected into the syringe of the electrostatic spinning equipment, and the film is prepared by the electrostatic spinning equipment; the spinning temperature is 25°C, the spinning solution advance rate is 1ml / h, the spinning voltage is 20kV, and the spinning The distance between the wire needle and the receiving plate is 20cm, and the humidity is 30%;

[0042]The second step: Expose the obtained nascent fiber membrane to the air for 24 hours to fully volatili...

Embodiment 3

[0047]Step 1: Weigh 2g of polyvinyl alcohol, dissolve it in 18g of deionized water, heat and stir at 80°C for 10 hours to obtain a 10wt% polyvinyl alcohol solution; ethyl orthosilicate / oxalic acid / deionized water in mass ratio Mix for 1 / 0.01 / 11, stir at room temperature for 12 hours to obtain the ethyl orthosilicate solution; mix the ethyl orthosilicate solution / polyvinyl alcohol solution at a mass ratio of 1 / 1, and stir at room temperature for 12 hours to obtain the precursor Body solution. Then the obtained precursor solution is injected into the syringe of the electrostatic spinning equipment, and the film is prepared by the electrostatic spinning equipment; the spinning temperature is 25°C, the spinning solution advance rate is 1ml / h, the spinning voltage is 20kV, and the spinning The distance between the wire needle and the receiving plate is 20cm, and the humidity is 30%;

[0048]The second step: Expose the obtained nascent fiber membrane to the air for 24 hours to fully volatili...

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Abstract

The present invention relates to a kind of based on electrospinning SiO 2 Nanofiber airgel thermal insulation material and its preparation and application, first prepare SiO 2 Nanofibers, and then prepare fiber / functional polymer composite dispersion; then prefreeze the dispersion, and then remove its solvent to form polymer / fiber-based airgel; and then calcine at high temperature to obtain Modified SiO 2 Nanofiber airgel insulation material. SiO prepared by the present invention 2 Airgel maintains good thermal insulation and mechanical properties in high and low temperature environments, and has good flexibility, which greatly improves the performance of ordinary SiO 2 The problem of high brittleness and poor mechanical properties of airgel; the density is low, which can be as low as 2.0mg / cm 3 ; Thermal conductivity can be as low as 0.02W / (m·K). The method has simple process, easy operation and good application prospect.

Description

Technical field[0001]The invention belongs to the field of thermal insulation materials and their preparation and application, and in particular relates to an electrostatic spinning SiO2Nanofiber aerogel heat insulation material and its preparation and application.Background technique[0002]Aerogel is an ultra-light porous condensed substance with a three-dimensional network structure using gas as a dispersion medium. In 1931, Kistler of Stanford University in the United States prepared the world's first aerogel by hydrolyzing water glass. By the 1960s, with the deepening of the sol-gel method and the gradual improvement of supercritical drying technology, the The research of gel materials has been developed rapidly. Inorganic aerogel materials have the advantages of high porosity, large specific surface area, low density, low thermal conductivity, and strong doping adsorption capacity. They are used in the fields of energy, information, environmental protection, medicine, pesticides...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B30/02D01D5/00C04B14/46
CPCC04B30/02C04B2201/20C04B2201/32D01D5/0069C04B14/4631
Inventor 俞昊朱悦黄涛吕莎莎段小超杨通辉朱美芳
Owner DONGHUA UNIV
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