Preparing method of silicon dioxide aerogel nanofiber composite membrane

A technology of silica and nanofibers, which is applied in fiber treatment, fiber chemical characteristics, rayon manufacturing, etc., can solve the problems of silica airgel aggregation, complicated process routes, and destruction of porous structures, so as to achieve easy processing, The effect of simple process and high specific surface area

Inactive Publication Date: 2018-05-15
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The high cost, low toughness, and low strength of silica airgel limit its application. Therefore, the research on the modification of silica airgel has become a hot research topic at present.
However, the above method to prepare SiO 2 The process of fiber composite materials needs to go through multiple processes to complete, and the process route is complicated. At the same time, the porous structure of silica airgel may be destroyed, resulting in the aggregation of silica airgel, etc.

Method used

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  • Preparing method of silicon dioxide aerogel nanofiber composite membrane
  • Preparing method of silicon dioxide aerogel nanofiber composite membrane
  • Preparing method of silicon dioxide aerogel nanofiber composite membrane

Examples

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Embodiment 1

[0027] A method for preparing a silica airgel nanofiber composite membrane, comprising the steps of:

[0028] 1)SiO2 2 / Preparation of formic acid dispersion: at room temperature, weigh 20.25g of 88% formic acid; add 0.54g of silica airgel powder to formic acid in batches in small amounts, and oscillate ultrasonically for 15 minutes until uniformly dispersed , to obtain a dispersion of silica airgel;

[0029] 2) PA6 / SiO2 2 Preparation of spinning solution: Weigh 3g of dried PA6 resin and 6.75g of acetic acid, add it to the dispersion of silica airgel, stir magnetically at room temperature for 12h until the PA6 resin is completely dissolved, let it stand for defoaming, and obtain the silica airgel Silica airgel content is the electrospinning solution of 18wt%;

[0030] 3) PA6 / SiO2 2 Electrospinning: Use the self-assembled electrospinning nanofiber equipment as the spinning device, and use a 10ml medical syringe to extract the prepared PA6 / SiO 2 solution, choose 8# flat ne...

Embodiment 2

[0033] A method for preparing a silica airgel nanofiber composite membrane, comprising the steps of:

[0034] 1)SiO2 2 Preparation of the formic acid dispersion: at room temperature, weigh 13.5 g of 88% formic acid. Add 0.48g of silica airgel powder to formic acid in batches in a small amount and multiple times, and ultrasonically oscillate for 20 minutes until uniformly dispersed to obtain a dispersion of silica airgel;

[0035] 2) PA66 / SiO2 2 Preparation of spinning solution: Weigh 2g of dried PA66 resin and 4.5g of acetic acid and add it to the dispersion of silica airgel, stir magnetically at room temperature for 12 hours until the PA66 resin is completely dissolved, and stand for defoaming to obtain silica An electrospinning solution with an airgel content of 24% by weight;

[0036] 3) PA66 / SiO2 2 Electrospinning: Use the self-assembled electrospinning nanofiber equipment as the spinning device, and use a 10ml medical syringe to extract the prepared PA6 / SiO 2 solutio...

Embodiment 3

[0039] A method for preparing a silica airgel nanofiber composite membrane, comprising the steps of:

[0040] 1)SiO2 2 / Preparation of hexafluoroisopropanol dispersion: weigh 13.5 g of hexafluoroisopropanol solution at room temperature. Add 0.84 g of silica airgel powder into hexafluoroisopropanol in batches in a small amount and multiple times, and ultrasonically oscillate for 2 hours until uniformly dispersed to obtain a dispersion of silica airgel;

[0041] 2) PA6 / SiO2 2 Preparation of spinning solution: Weigh 2g of dried PA6 resin and add it to the dispersion of silica airgel, stir magnetically at room temperature for 12 hours until the PA6 resin is completely dissolved, let stand for defoaming, and obtain the content of silica airgel It is a 42wt% electrospinning solution;

[0042] 3) PA6 / SiO2 2 Electrospinning: Use the self-assembled electrospinning nanofiber equipment as the spinning device, and use a 10ml medical syringe to extract the prepared PA6 / SiO 2 Solution...

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Abstract

The invention discloses a preparing method of a silicon dioxide aerogel nanofiber composite membrane, and relates to nanofiber composite membranes. The method comprises the steps of preparing a silicon dioxide aerogel/organic solvent dispersion liquid; preparing a polymer/SiO2 spinning solution; conducting electrostatic spinning on a polymer/SiO2; conducting post-treatment on the nanofiber composite membrane. Fibers of the prepared silicon dioxide aerogel nanofiber composite membrane are in needle shapes, the average diameter of the fibers is 200-300 nm, and the specific surface area of the silicon dioxide aerogel nanofiber composite membrane can reach 55 m<2>/g; the process is simple, the preparing condition is mild, and the obtained composite nanofiber membrane is large in specific surface area and small in fiber diameter and is expected to be applied to the fields of heat insulation, adsorption, catalysis, bioengineering and the like.

Description

technical field [0001] The invention relates to a nanofiber composite membrane, in particular to a method for preparing a silica airgel nanofiber composite membrane. Background technique [0002] Silica airgel is a lightweight nanoporous amorphous solid material with excellent heat resistance and heat insulation performance, and the pore diameter is in the range of 1 to 100nm. Silica airgel has a three-dimensional spatial network structure, 95% of which is composed of air, with nanoscale pores of high porosity (greater than 99%), high specific area (200m 2 / g~1000m 2 / g), low bulk density (as low as 3kg / m 3 ), extremely low thermal conductivity (thermal conductivity as low as 0.013W / (m K), etc., and has excellent thermal, optical, dielectric and other characteristics, and has broad application prospects in thermal insulation, adsorption, catalysis and other fields . [0003] The high cost, low toughness, and low strength of silica airgel limit its application. Therefore,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H3/009D04H3/007D01D5/00D01F6/90D01F1/10D01F6/54
CPCD01D5/0069D01D5/0092D01F1/10D01F6/54D01F6/90D04H3/007D04H3/009D10B2321/021D10B2321/06D10B2321/10D10B2331/02
Inventor 余煜玺马晴岩颜少乐余洪哿马锐
Owner XIAMEN UNIV
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