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Preparation method of high-strength spider silk composite silicon dioxide aerogel

A technology of composite silica and spider silk, applied in ceramic products, applications, household appliances, etc., can solve the problems of uneven composition and structure of composite materials, poor mechanical properties of the matrix, weak performance, etc., and improve the attraction and bonding strength. , enhance mechanical properties, reduce the effect of volume shrinkage

Inactive Publication Date: 2018-06-01
吕莉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem mainly solved by the present invention is aimed at the poor mechanical properties of the matrix due to the loose network skeleton structure of the current airgel, and there is a difference between the filler and the airgel matrix in the composite silica airgel material, which will Defects that lead to the appearance of inhomogeneous regions of composition and structure in composite materials, which lead to the appearance of weak performance regions, provide a method for preparing high-strength spider silk composite silica airgel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] Use iron wire to make a circular wire circle with a radius of 15 cm, and use the circular wire circle to collect 5 complete spider webs to obtain a spider web felt, and put the collected spider web felt under ultraviolet light to irradiate and sterilize 1h, to obtain a sterilized spider web mat; soak the above-mentioned sterilized spider web mat with absolute ethanol for 12h and then take it out to obtain a pre-modified spider web mat, and then spread the pre-modified spider web mat in a hydrothermal reaction kettle, Pour the sodium silicate solution with a mass fraction of 30% into the reaction kettle until the spider web blanket is completely submerged to obtain the reactant; adjust the pH of the above reactant to 4.5 with a concentration of 1mol / L hydrochloric acid, and then raise the hydrothermal reaction kettle Temperature to 120°C, heat preservation reaction for 1 hour, after the reaction, take out the reacted spider web felt, dry it naturally, cut and separate the...

example 2

[0028]Use iron wire to make a circular wire circle with a radius of 15 cm, and collect 7 complete spider webs by wrapping the circular wire circle to obtain a spider web felt, and put the collected spider web felt under ultraviolet light to irradiate and sterilize 1.5h to obtain a sterilized spider web mat; soak the above sterilized spider web mat with absolute ethanol for 13h and then take it out to obtain a pre-modified spider web mat, and spread the pre-modified spider web mat in a hydrothermal reaction kettle , pour a sodium silicate solution with a mass fraction of 30% into the reactor until the spider web felt is completely submerged to obtain a reactant; adjust the pH of the above reactant to 5.0 with a concentration of 1mol / L hydrochloric acid, and then increase the hydrothermal reaction The temperature of the kettle is 125°C, and the heat preservation reaction is carried out for 1.5 hours. After the reaction, take out the reacted spider web felt, dry it naturally, cut ...

example 3

[0030] Make a circular iron wire circle with a radius of 15cm with iron wire, and collect 10 complete spider webs by winding the circular iron wire circle to obtain a spider web felt, and put the collected spider web felt under ultraviolet light to irradiate and sterilize 2h to obtain a sterilized spider web mat; soak the above sterilized spider web mat with absolute ethanol for 14h and then take it out to obtain a pre-modified spider web mat, and then spread the pre-modified spider web mat in a hydrothermal reaction kettle. Pour the sodium silicate solution with a mass fraction of 30% into the reaction kettle until the spider web blanket is completely submerged to obtain the reactant; adjust the pH of the above reactant to 5.5 with a concentration of 1mol / L hydrochloric acid, and then raise the hydrothermal reaction kettle Temperature to 130°C, heat preservation reaction for 2 hours, after the reaction, take out the reacted spider web felt, dry it naturally, cut and separate t...

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Abstract

The invention relates to the technical field of silicon dioxide aerogel preparation, in particular to a preparation method of high-strength spider silk composite silicon dioxide aerogel. The preparation method comprises the steps of preparing spider web felt from spider silk, modifying the spider web felt, allowing the modified spider web felt, silicic acid and hydrochloric acid to give a reactionto generate an orthosilicic acid precipitate to form a spider web felt reinforcement material rich in orthosilicic acid on the surface, and blending the reinforcement material and a composite siliconsource for reaction to prepare the high-strength spider silk composite silicon dioxide aerogel. Nano silicon dioxide generated by the reinforcement material under a high temperature condition can improve mechanical strength of the aerogel; hydrofluoric acid is added as a catalyst to improve porosity and adsorption activity of the aerogel; intermolecular attraction bond strength of the aerogel isimproved; a mechanical property of the silicon dioxide aerogel is further improved; and the aerogel has a wide application prospects.

Description

technical field [0001] The invention relates to the technical field of silica airgel preparation, in particular to a preparation method of high-strength spider silk composite silica airgel. Background technique [0002] Silica aerogel, as one of the most studied airgel materials, has many excellent properties, such as extremely low bulk density, high specific surface area, and low thermal conductivity, which makes it widely used in scientific research. , military, aerospace and industrial fields have a wide range of applications. However, the loose network skeleton structure of aerogels leads to poor mechanical properties of the matrix and cannot withstand large forces, which greatly limits the application of aerogels. [0003] Silica airgel is generally prepared by the sol-gel method. First, the silicon source is hydrolyzed under catalyst conditions, and then the hydroxyl groups on the hydrolyzed product undergo a condensation reaction to form a sol. The primary and second...

Claims

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Application Information

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IPC IPC(8): C04B30/02C04B38/00
CPCC04B30/02C04B38/0045C04B2201/50C04B14/062C04B16/00
Inventor 徐炜林茂兰张建初
Owner 吕莉
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