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A low-cost method for preparing silica airgel

A silica and aerogel technology, which is applied in the field of low-cost preparation of silica aerogel, can solve the problem of poor uniformity of aerogel materials in a large area, high cost of silica aerogel, and uniform dispersion of inorganic fibers. Difficulties and other problems, to achieve the effect of significant market application value, small investment and high flexibility

Active Publication Date: 2019-05-31
BEIJING PAINUOMENG ENERGY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, it is very difficult to uniformly disperse inorganic fibers in the gel precursor, and the large-area uniformity of the prepared airgel material is poor, and the cost of the frequently used silicon source is high, resulting in the high cost of silica airgel.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Add basalt fiber to methanol, set the temperature of methanol at 30°C, and the stirring speed at 500 rpm, then add water and concentrated sulfuric acid in sequence, adjust its pH value to 3-4, and carry out inorganic Fiber surface pretreatment, pretreated inorganic fiber powder obtained through filtration, the mass ratio of basalt fiber, methanol, water and concentrated sulfuric acid is 1:5:2:0.5;

[0032] (2) Add the pretreated basalt fiber powder obtained in step (1) to a citric acid solution with a mass fraction of 20%, put it into a microwave box, and use microwave heating. The microwave power of microwave heating is 100W, and the control React for 10 minutes, the reaction temperature is 40 ° C, centrifugal filtration, so that the surface of the pretreated basalt fiber is rough with loose pores, and acidified basalt fiber is obtained. The mass ratio of basalt fiber powder to citric acid solution is 1:5;

[0033](3) Blend 98 parts by weight of sodium silicate, 0....

Embodiment 2

[0038] (1) Add calcium carbonate fiber to ethanol, set the temperature of ethanol at 45°C, and stir at 400 rpm, then add water and concentrated sulfuric acid in sequence, adjust the pH value to 3-4, and carry out Inorganic fiber surface pretreatment, the pretreated inorganic fiber powder obtained through filtration, the mass ratio of calcium carbonate fiber, ethanol, water and concentrated sulfuric acid is 1:8:2:0.4;

[0039] (2) Add the pretreated calcium carbonate fiber powder obtained in step (1) to a citric acid solution with a mass fraction of 22%, put it into a microwave box, and use microwave heating. The microwave power of microwave heating is 130W. Control the reaction for 12 minutes, the reaction temperature is 45°C, and centrifugally filter to make the surface of the pretreated calcium carbonate fiber rough with loose pores to obtain acidified calcium carbonate fiber. The mass ratio of calcium carbonate fiber powder to citric acid solution is 1 :10;

[0040] (3) Bl...

Embodiment 3

[0045] (1) Add the mixed fibers of sepiolite fiber and wollastonite fiber into n-propanol, set the temperature of n-propanol at 55°C, and stir at 300 rpm, then add water and concentrated hydrochloric acid in sequence , adjust its pH value to between 3-4, carry out inorganic fiber surface pretreatment, obtain pretreated inorganic fiber powder after filtration, mixed fiber of sepiolite fiber, wollastonite fiber, n-propanol, water and concentrated The mass ratio of hydrochloric acid is 1:15:5:0.2;

[0046] (2) Add the mixed fiber powder of sepiolite fiber and wollastonite fiber obtained in step (1) into the citric acid solution with a mass fraction of 22%, put it into a microwave box, and heat it with microwave , the microwave power of microwave heating is 150W, the reaction is controlled for 15 minutes, the reaction temperature is 55 ° C, centrifugal filtration, so that the surface of the mixed fiber of the pretreated sepiolite fiber and wollastonite fiber is rough and has the s...

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Abstract

The invention provides a method for preparing silicon dioxide aerogel with a low cost. The method includes the steps that firstly, inorganic fibers are subjected to acidification for surface modification so that the fiber surfaces can be coarse and have loose pore states; then sodium silicate is added to be subjected to reaction and bonding with the acidified inorganic fiber surfaces; and under the function of a water reducing agent, the aerogel is dried at normal pressure through the water reducing agent so as to solve the problem of volume shrinkage, and the silicon dioxide aerogel cannot collapse in the normal pressure drying process. The silicon dioxide aerogel prepared through the method is uniform in distribution, replacement with any solvent is not needed in the preparation process, the production cycle is short, the production cost is greatly lowered, and the silicon dioxide aerogel is suitable for large-scale industrialized production.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a low-cost method for preparing silica airgel. Background technique [0002] Airgel is the lightest solid in the world. It is a porous condensed matter with a three-dimensional network structure as a scaffold filled with a gas dispersion medium. Airgel materials have the advantages of large specific surface area, high porosity, low thermal conductivity, low density, and strong doping adsorption capacity. Broad application prospects. Airgel Now, as a new type of lightweight multifunctional material, inorganic airgel materials containing fiber structures have the characteristics of traditional inorganic particle-type aerogels and have the advantages of fiber structures, such as porosity High connectivity, good mechanical flexibility, controllable structure, and high media transmission efficiency have significantly improved the application performance of a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B28/24
CPCC04B28/24C04B2201/50C04B14/46C04B24/42C04B24/04C04B24/161C04B38/0045C04B38/0074C04B14/40
Inventor 陈庆曾军堂王镭迪
Owner BEIJING PAINUOMENG ENERGY TECH
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