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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0025] Example 1

[0026] Use iron wire to make a round iron wire loop with a radius of 15cm, and wind the round iron wire loop to collect 5 complete spider webs to obtain a spider web felt, and place the collected spider web felt under ultraviolet light for sterilization 1h to obtain a sterilized spider web felt; the above sterilized spider web felt was soaked in absolute ethanol for 12 hours and then taken out to obtain a pre-modified spider web felt, and then the pre-modified spider web felt was laid flat in a hydrothermal reactor. Pour a 30% mass fraction of sodium silicate solution into the reactor until the spider web felt is completely immersed to obtain a reactant; adjust the pH of the above reactant to 4.5 with a concentration of 1mol / L hydrochloric acid, and then raise the hydrothermal reactor The temperature is increased to 120℃, and the reaction is kept for 1h. After the reaction, the reacted cobweb felt is taken out, dried naturally, the cobweb felt is cut and separa...

Example Embodiment

[0027] Example 2

[0028] Use iron wire to make a round iron wire circle with a radius of 15cm, and wind the round iron wire circle to collect 7 complete spider webs to obtain a spider web felt. Place the collected spider web felt under ultraviolet light for sterilization 1.5h to obtain a sterilized spider web felt; the above sterilized spider web felt was soaked in absolute ethanol for 13 hours and then taken out to obtain a pre-modified spider web felt, and then the pre-modified spider web felt was laid flat in a hydrothermal reactor , Pour a 30% mass fraction of sodium silicate solution into the reaction kettle until the spider web felt is completely immersed to obtain a reactant; adjust the pH of the reactant to 5.0 with a concentration of 1mol / L hydrochloric acid, and then increase the hydrothermal reaction The temperature of the kettle is brought to 125°C, and the temperature is kept for 1.5 hours. After the reaction, the reacted cobweb felt is taken out, dried naturally, a...

Example Embodiment

[0029] Example 3

[0030] Use iron wire to make a round iron wire circle with a radius of 15cm, and use the round iron wire circle to collect 10 complete cobwebs to obtain a cobweb blanket, and place the collected cobweb blanket under ultraviolet light for sterilization 2h to obtain a sterilized spider web felt; the above sterilized spider web felt was soaked in absolute ethanol for 14 hours and then taken out to obtain a pre-modified spider web felt, and then the pre-modified spider web felt was laid flat in a hydrothermal reactor. Pour a 30% mass fraction of sodium silicate solution into the reactor until the spider web felt is completely immersed to obtain a reactant; adjust the pH of the above reactant to 5.5 with a concentration of 1mol / L hydrochloric acid, and then raise the hydrothermal reactor The temperature was raised to 130℃, and the reaction was kept for 2h. After the reaction, the reacted spider web felt was taken out, dried naturally, the spider web felt was cut and...

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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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