CN119349588A - A kind of aerogel material and its preparation method and application - Google Patents
A kind of aerogel material and its preparation method and application Download PDFInfo
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- C01B33/00—Silicon; Compounds thereof
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- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
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Abstract
The invention discloses an aerogel material and a preparation method and application thereof, and belongs to the technical field of aerogel; preparing a silicon precursor, catalyzing to generate silica sol, modifying, including one-stage freezing modification and two-stage freezing modification, and drying at normal pressure to obtain the aerogel material. By introducing azodiisobutyronitrile and performing freeze modification treatment on the silica sol, the sensitivity of the waterproof and heat insulation properties to temperature changes is significantly reduced. It is worth noting that the azodiisobutyronitrile and the silica sol subjected to freezing modification can have synergistic effect, and the compounding not only further weakens the temperature dependence of the waterproof and heat insulation performances of the aerogel, but also remarkably enhances the performance of the aerogel at normal temperature, widens the suitable use temperature range of the aerogel, and improves the practical value of the aerogel.
Description
Technical Field
The invention relates to the technical field of aerogel, in particular to an aerogel material and a preparation method and application thereof.
Background
The silicon-based aerogel is a reticular porous material and has the advantages of low density, good heat insulation performance, high hydrophobicity, high porosity and the like, but when the use temperature changes, various performances of the aerogel, especially the heat insulation performance and the hydrophobicity, can be influenced. Therefore, reducing the temperature sensitivity of the aerogel properties (especially the insulation properties and the hydrophobicity) has become a problem to be solved currently.
Based on the above, the invention designs an aerogel material, and a preparation method and application thereof, so as to solve the problems.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides an aerogel material, and a preparation method and application thereof.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
a method of preparing an aerogel material, comprising the steps of:
step one, preparing a stabilizer;
Gradually heating azodiisobutyronitrile powder to be in a molten state, dissolving azodiisobutyronitrile in ethanol in the molten state, and stirring to obtain a stabilizer;
Preparing a silicon precursor;
Grinding industrial silicon slag with silicon dioxide as a main component into powder, pickling for 1-2h by using pickling liquor, removing aluminum oxide and alkali, and drying at 40-50 ℃ to obtain a silicon precursor;
Step three, catalyzing to generate silica sol;
adding the silicon precursor into concentrated ammonia water, stirring for 10-15min to obtain activated silicon, adding the activated silicon into a stabilizer, and catalyzing for 2-3h to generate silica sol;
step four, modification treatment;
One-stage freezing modification, namely preserving the silica sol at-5 to-2 ℃ for 25-35min, and naturally heating to normal temperature;
Two-stage freezing modification, namely preserving the silica sol subjected to the first-stage freezing modification at 8-10 ℃ below zero for 25-35min, and naturally heating to normal temperature;
And fifthly, drying at normal pressure to obtain the aerogel material.
Further, the step one specifically comprises heating azobisisobutyronitrile powder gradually to be in a molten state, dissolving azobisisobutyronitrile in ethanol in the molten state, and stirring for 20-30min at 150-200r/min to obtain the stabilizer.
Further, in the first step, the mass ratio of the azodiisobutyronitrile to the ethanol is 1.5-2:100-120.
Further, the azobisisobutyronitrile powder is heated to a temperature of 110-120 ℃.
Further, the second step is to take industrial silicon slag with silicon dioxide as main component, grind the industrial silicon slag into powder, remove alumina and alkali after pickling for 1-2h by pickling solution, and dry the powder at 40-50 ℃ to obtain the silicon precursor.
Further, the industrial silicon slag powder is sieved by a 50-70 mesh sieve.
Further, the pH of the pickling solution is 2-3.
And the third step is to add 0.5-1 part of silicon precursor into 0.2-0.5 part of strong ammonia water, stir for 10-15min at 150-200r/min to obtain activated silicon, add the activated silicon into stabilizer, catalyze for 2-3h to generate silica sol.
An aerogel material prepared according to the method for preparing an aerogel material.
The aerogel material is applied to the preparation of waterproof river sand, waterproof quartz sand, desert modifier, curing agent and waterproof agent.
Compared with the prior art, the invention has the beneficial effects that:
According to the invention, by introducing the azodiisobutyronitrile, the waterproof and heat-insulating effects of the aerogel in a high-temperature environment are obviously improved, and almost the level equivalent to that of a normal-temperature state is reached, so that the sensitivity of the waterproof and heat-insulating performance to temperature change is obviously weakened. Further, the first and second freezing modification treatments applied to the silica sol are also effective in reducing the temperature sensitivity of these properties of the aerogel. It is worth noting that according to comparative experimental data analysis, the azodiisobutyronitrile and the silica sol subjected to freezing modification can have synergistic effect, and the composition not only further weakens the temperature dependence of the waterproof and heat insulation performances of the aerogel, but also remarkably enhances the performance of the aerogel at normal temperature, widens the suitable use temperature interval of the aerogel, and improves the practical value of the aerogel.
In addition, the invention uses industrial silica slag as raw material to produce novel environment-friendly heat insulation material aerogel for building, reduces environmental pollution caused by industrial solid waste, realizes energy conservation and emission reduction, protects environment, and truly realizes green building.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a sample graph of aerogel materials made in accordance with the present invention;
FIG. 2 is a sample plot of aerogel materials produced in accordance with the present invention;
FIG. 3 is a sample plot of waterproof river sand made from aerogel materials;
FIG. 4 is a sample plot of a waterproof quartz sand made from aerogel material;
FIG. 5 is a sample graph of a desert modifier made from aerogel material;
FIG. 6 is a sample plot of a curing agent made from aerogel material;
fig. 7 is a sample graph of a waterproofing agent made from aerogel material.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1 as shown in fig. 1-2, this example provides a method for preparing an aerogel material, comprising the steps of:
step one, preparing a stabilizer;
Gradually heating 2g of azodiisobutyronitrile powder to 120 ℃ to be in a molten state, dissolving the azodiisobutyronitrile in 120g of 70% ethanol in the molten state, and stirring for 30min at 200r/min to obtain a stabilizer;
Preparing a silicon precursor;
grinding industrial silicon slag with silicon dioxide as a main component into powder, sieving with a 70-mesh sieve, pickling with pickling solution with pH of 2 for 2 hours, removing aluminum oxide and alkali, and drying at 50 ℃ to obtain a silicon precursor;
Step three, catalyzing to generate silica sol;
Adding 1g of silicon precursor into 0.5g of concentrated ammonia water, stirring for 15min at 200r/min to obtain activated silicon, adding the activated silicon into a stabilizer, and catalyzing for 3h to generate silica sol;
step four, modification treatment;
One-stage freezing modification, namely preserving the silica sol at minus 5 ℃ for 35min, and naturally heating to normal temperature;
two-stage freezing modification, namely preserving the silica sol subjected to the first-stage freezing modification at the temperature of minus 10 ℃ for 35min;
step five, drying at normal pressure to obtain aerogel materials;
the method comprises the steps of sealing silica sol to be dried, then carrying out water bath heating, collecting the mass and the real-time temperature of the silica sol to be dried, determining the stirring time and the initial stirring speed during the water bath heating, adjusting the initial stirring speed according to the real-time temperature to obtain aerogel to be dried, collecting the viscosity data of the aerogel to be dried, judging whether the water bath heating is qualified, putting the aerogel to be dried into a sheet-shaped mold after judging the water bath heating is qualified, placing the aerogel to be dried into a drying chamber for normal-pressure drying, determining the initial rotating speed of a drying fan according to the arrangement density during normal-pressure drying, collecting the real-time mass data of the aerogel to be dried, and judging whether the initial rotating speed is adjusted.
The normal pressure drying method refers to a normal pressure drying method and system for silicon-based aerogel disclosed in Chinese patent CN 116929005A.
Example 2 as shown in fig. 1-2, this example provides a method for preparing an aerogel material, comprising the steps of:
step one, preparing a stabilizer;
Gradually heating 1.5g of azodiisobutyronitrile powder to 110 ℃ to be in a molten state, dissolving the azodiisobutyronitrile in the molten state in 100g of 70% ethanol, and stirring for 20min at 150r/min to obtain a stabilizer;
Preparing a silicon precursor;
grinding industrial silicon slag with silicon dioxide as a main component into powder, sieving with a 50-mesh sieve, pickling with pickling solution with pH of 3 for 1h, removing aluminum oxide and alkali, and drying at 40 ℃ to obtain a silicon precursor;
Step three, catalyzing to generate silica sol;
Adding 0.5g of silicon precursor into 0.2g of concentrated ammonia water, stirring for 10min at 150r/min to obtain activated silicon, adding the activated silicon into a stabilizer, and catalyzing for 2h to generate silica sol;
step four, modification treatment;
one-stage freezing modification, namely preserving the silica sol at minus 2 ℃ for 25min, and naturally heating to normal temperature;
Two-stage freezing modification, namely preserving the silica sol subjected to the first-stage freezing modification at the temperature of minus 8 ℃ for 25min, and naturally heating to normal temperature;
step five, drying at normal pressure to obtain aerogel materials;
the method comprises the steps of sealing silica sol to be dried, then carrying out water bath heating, collecting the mass and the real-time temperature of the silica sol to be dried, determining the stirring time and the initial stirring speed during the water bath heating, adjusting the initial stirring speed according to the real-time temperature to obtain aerogel to be dried, collecting the viscosity data of the aerogel to be dried, judging whether the water bath heating is qualified, putting the aerogel to be dried into a sheet-shaped mold after judging the water bath heating is qualified, placing the aerogel to be dried into a drying chamber for normal-pressure drying, determining the initial rotating speed of a drying fan according to the arrangement density during normal-pressure drying, collecting the real-time mass data of the aerogel to be dried, and judging whether the initial rotating speed is adjusted.
The normal pressure drying method refers to a normal pressure drying method and system for silicon-based aerogel disclosed in Chinese patent CN 116929005A.
Embodiment 3 As shown in FIGS. 1-2, the present embodiment provides a method for preparing an aerogel material, comprising the steps of:
step one, preparing a stabilizer;
Gradually heating 1.6g of azodiisobutyronitrile powder to 13 ℃ to be in a molten state, dissolving the azodiisobutyronitrile in 105g of 70% ethanol in the molten state, and stirring for 22min at 180r/min to obtain a stabilizer;
Preparing a silicon precursor;
Grinding industrial silicon slag with silicon dioxide as a main component into powder, sieving with a 70-mesh sieve, pickling with pickling solution with pH of 2.5 for 2 hours, removing aluminum oxide and alkali, and drying at 48 ℃ to obtain a silicon precursor;
Step three, catalyzing to generate silica sol;
Adding 0.8g of silicon precursor into 0.4g of concentrated ammonia water, stirring for 13min at 170r/min to obtain activated silicon, adding the activated silicon into a stabilizer, and catalyzing for 3h to generate silica sol;
step four, modification treatment;
one-stage freezing modification, namely preserving the silica sol at the temperature of minus 3 ℃ for 30min, and naturally heating to normal temperature;
Two-stage freezing modification, namely preserving the silica sol subjected to the first-stage freezing modification at the temperature of minus 10 ℃ for 30min, and naturally heating to normal temperature;
step five, drying at normal pressure to obtain aerogel materials;
the method comprises the steps of sealing silica sol to be dried, then carrying out water bath heating, collecting the mass and the real-time temperature of the silica sol to be dried, determining the stirring time and the initial stirring speed during the water bath heating, adjusting the initial stirring speed according to the real-time temperature to obtain aerogel to be dried, collecting the viscosity data of the aerogel to be dried, judging whether the water bath heating is qualified, putting the aerogel to be dried into a sheet-shaped mold after judging the water bath heating is qualified, placing the aerogel to be dried into a drying chamber for normal-pressure drying, determining the initial rotating speed of a drying fan according to the arrangement density during normal-pressure drying, collecting the real-time mass data of the aerogel to be dried, and judging whether the initial rotating speed is adjusted.
The normal pressure drying method refers to a normal pressure drying method and system for silicon-based aerogel disclosed in Chinese patent CN 116929005A.
Example 4 in some examples, as shown in fig. 3, aerogel materials prepared in example 3 were added to waterproof river sand raw materials to prepare aerogel waterproof river sand.
Example 5 in some examples, aerogel materials prepared in example 3 were added to a water-repellent silica sand raw material as shown in fig. 4 to produce aerogel water-repellent silica sand.
Example 6 in some examples, aerogel materials prepared in example 3 were added to desert modifier materials to produce aerogel desert modifiers as shown in fig. 5.
Example 7 in some examples, aerogel materials from example 3 were added to a curative feed as shown in fig. 6 to produce aerogel curatives.
Example 8 in some examples, as shown in fig. 7, aerogel materials prepared in example 3 were added to a raw material of a waterproofing agent to prepare an aerogel waterproofing agent.
Comparative example 1 differs from example 3 in that azobisisobutyronitrile is not added;
As shown in fig. 1-2, the present comparative example provides a method for preparing an aerogel material, comprising the steps of:
step one, preparing a stabilizer;
Stirring 105g of 70% ethanol at 180r/min for 22min to obtain a stabilizer;
Preparing a silicon precursor;
Grinding industrial silicon slag with silicon dioxide as a main component into powder, sieving with a 70-mesh sieve, pickling with pickling solution with pH of 2.5 for 2 hours, removing aluminum oxide and alkali, and drying at 48 ℃ to obtain a silicon precursor;
Step three, catalyzing to generate silica sol;
Adding 0.8g of silicon precursor into 0.4g of concentrated ammonia water, stirring for 13min at 170r/min to obtain activated silicon, adding the activated silicon into a stabilizer, and catalyzing for 3h to generate silica sol;
step four, modification treatment;
one-stage freezing modification, namely preserving the silica sol at the temperature of minus 3 ℃ for 30min, and naturally heating to normal temperature;
Two-stage freezing modification, namely preserving the silica sol subjected to the first-stage freezing modification at the temperature of minus 10 ℃ for 30min, and naturally heating to normal temperature;
step five, drying at normal pressure to obtain aerogel materials;
the method comprises the steps of sealing silica sol to be dried, then carrying out water bath heating, collecting the mass and the real-time temperature of the silica sol to be dried, determining the stirring time and the initial stirring speed during the water bath heating, adjusting the initial stirring speed according to the real-time temperature to obtain aerogel to be dried, collecting the viscosity data of the aerogel to be dried, judging whether the water bath heating is qualified, putting the aerogel to be dried into a sheet-shaped mold after judging the water bath heating is qualified, placing the aerogel to be dried into a drying chamber for normal-pressure drying, determining the initial rotating speed of a drying fan according to the arrangement density during normal-pressure drying, collecting the real-time mass data of the aerogel to be dried, and judging whether the initial rotating speed is adjusted.
The normal pressure drying method refers to a normal pressure drying method and system for silicon-based aerogel disclosed in Chinese patent CN 116929005A.
Comparative example 2 the difference from example 3 is that no modification treatment was performed on the silica sol;
As shown in fig. 1-2, the present comparative example provides a method for preparing an aerogel material, comprising the steps of:
step one, preparing a stabilizer;
Gradually heating 1.6g of azodiisobutyronitrile powder to 13 ℃ to be in a molten state, dissolving the azodiisobutyronitrile in 105g of 70% ethanol in the molten state, and stirring for 22min at 180r/min to obtain a stabilizer;
Preparing a silicon precursor;
Grinding industrial silicon slag with silicon dioxide as a main component into powder, sieving with a 70-mesh sieve, pickling with pickling solution with pH of 2.5 for 2 hours, removing aluminum oxide and alkali, and drying at 48 ℃ to obtain a silicon precursor;
Step three, catalyzing to generate silica sol;
Adding 0.8g of silicon precursor into 0.4g of concentrated ammonia water, stirring for 13min at 170r/min to obtain activated silicon, adding the activated silicon into a stabilizer, and catalyzing for 3h to generate silica sol;
Step four, drying at normal pressure to obtain aerogel materials;
the method comprises the steps of sealing silica sol to be dried, then carrying out water bath heating, collecting the mass and the real-time temperature of the silica sol to be dried, determining the stirring time and the initial stirring speed during the water bath heating, adjusting the initial stirring speed according to the real-time temperature to obtain aerogel to be dried, collecting the viscosity data of the aerogel to be dried, judging whether the water bath heating is qualified, putting the aerogel to be dried into a sheet-shaped mold after judging the water bath heating is qualified, placing the aerogel to be dried into a drying chamber for normal-pressure drying, determining the initial rotating speed of a drying fan according to the arrangement density during normal-pressure drying, collecting the real-time mass data of the aerogel to be dried, and judging whether the initial rotating speed is adjusted.
The normal pressure drying method refers to a normal pressure drying method and system for silicon-based aerogel disclosed in Chinese patent CN 116929005A.
Comparative example 3 differs from example 3 in that neither azobisisobutyronitrile nor silica sol was modified;
As shown in fig. 1-2, the present comparative example provides a method for preparing an aerogel material, comprising the steps of:
step one, preparing a stabilizer;
Stirring 105g of 70% ethanol at 180r/min for 22min to obtain a stabilizer;
Preparing a silicon precursor;
Grinding industrial silicon slag with silicon dioxide as a main component into powder, sieving with a 70-mesh sieve, pickling with pickling solution with pH of 2.5 for 2 hours, removing aluminum oxide and alkali, and drying at 48 ℃ to obtain a silicon precursor;
Step three, catalyzing to generate silica sol;
Adding 0.8g of silicon precursor into 0.4g of concentrated ammonia water, stirring for 13min at 170r/min to obtain activated silicon, adding the activated silicon into a stabilizer, and catalyzing for 3h to generate silica sol;
Step four, drying at normal pressure to obtain aerogel materials;
the method comprises the steps of sealing silica sol to be dried, then carrying out water bath heating, collecting the mass and the real-time temperature of the silica sol to be dried, determining the stirring time and the initial stirring speed during the water bath heating, adjusting the initial stirring speed according to the real-time temperature to obtain aerogel to be dried, collecting the viscosity data of the aerogel to be dried, judging whether the water bath heating is qualified, putting the aerogel to be dried into a sheet-shaped mold after judging the water bath heating is qualified, placing the aerogel to be dried into a drying chamber for normal-pressure drying, determining the initial rotating speed of a drying fan according to the arrangement density during normal-pressure drying, collecting the real-time mass data of the aerogel to be dried, and judging whether the initial rotating speed is adjusted.
The normal pressure drying method refers to a normal pressure drying method and system for silicon-based aerogel disclosed in Chinese patent CN 116929005A.
Experimental examples the silica-based aerogels prepared in examples 1 to 3 and comparative examples 1 to 3 were subjected to performance test, and the results are shown in the following table:
1. The method for measuring the thermal conductivity at different temperatures comprises sandwiching a measurement sample of 300×300×100mm 3 between an upper heater and a lower heater at different temperatures under a load of 0.3MPa to set the temperature difference to 20 ℃, and measuring the upper surface temperature, the lower surface temperature, etc. of the measurement sample while adjusting the temperature so as to form one-dimensional heat flow by protecting the heater. Then, the thermal resistance RS of the measurement sample is found by the following formula;
RS=N((TU-TL)/Q)-RO;
TU represents the upper surface temperature of the measured sample, TL represents the lower surface temperature of the measured sample, RO represents the contact thermal resistance of the upper and lower interfaces, Q represents the output of the heat flow meter, N is a proportionality coefficient, and is obtained in advance by using a correction sample;
thermal conductivity = d/RS.
2. Gradually cooling or heating the prepared aerogel, and observing the physical form change of the aerogel to obtain the proper use temperature (for example, the proper use temperature is below 500 ℃ when the aerogel starts to melt and deform at the temperature of above 500 ℃).
3. The water resistance at different temperatures is tested by taking samples with the size of 700 multiplied by 700mm and the thickness of 12mm, after the samples are conditioned, clamping the samples by a clamp and placing the samples on a support, and the samples face upwards during the test. The length direction of the sample is parallel to the water flow direction, 250mL of test water is quickly and stably poured into a funnel, spraying is continuously carried out for 25s-30s, immediately after the spraying is stopped, a clamp holder with the sample is taken away, the front of the sample is almost horizontal, then the clamp holder is lightly knocked against a solid hard object, the clamp holder is horizontally rotated for 180 degrees, then the clamp holder is lightly knocked again, and immediately after the knocking is finished, the front wetting degree of the sample on the clamp holder is rated according to the wetting phenomenon (grade 4: wetting at a spraying point with sporadic surface of the sample; grade 4-5: no wetting at the surface of the sample, a small amount of water drops, and grade 5: no water drops or wetting at the surface of the sample).
According to the table, the waterproof performance and the heat insulation performance of the aerogel at a high temperature are improved by adding the azodiisobutyronitrile, so that the waterproof performance and the heat insulation performance of the aerogel are almost the same as those of the aerogel at normal temperature, namely, the temperature sensitivity of the waterproof performance and the heat insulation performance of the aerogel is reduced, the waterproof performance and the heat insulation performance of the aerogel are also reduced by performing one-stage freezing modification and two-stage freezing modification on the silica sol, and in addition, the azodiisobutyronitrile is compounded with the frozen modified silica sol according to the data of the comparative example 3, and the waterproof performance and the heat insulation performance of the aerogel at normal temperature are also improved by matching the azodiisobutyronitrile and the silica sol.
The foregoing embodiments are merely for illustrating the technical solution of the present invention, but not for limiting the same, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that modifications may be made to the technical solution described in the foregoing embodiments or equivalents may be substituted for parts of the technical features thereof, and such modifications or substitutions may be made without departing from the spirit and scope of the technical solution of the embodiments of the present invention.
Claims (10)
1. A method of preparing an aerogel material, comprising the steps of:
step one, preparing a stabilizer;
Gradually heating azodiisobutyronitrile powder to be in a molten state, dissolving azodiisobutyronitrile in ethanol in the molten state, and stirring to obtain a stabilizer;
Preparing a silicon precursor;
Grinding industrial silicon slag with silicon dioxide as a main component into powder, pickling for 1-2h by using pickling liquor, removing aluminum oxide and alkali, and drying at 40-50 ℃ to obtain a silicon precursor;
Step three, catalyzing to generate silica sol;
adding the silicon precursor into concentrated ammonia water, stirring for 10-15min to obtain activated silicon, adding the activated silicon into a stabilizer, and catalyzing for 2-3h to generate silica sol;
step four, modification treatment;
One-stage freezing modification, namely preserving the silica sol at-5 to-2 ℃ for 25-35min, and naturally heating to normal temperature;
Two-stage freezing modification, namely preserving the silica sol subjected to the first-stage freezing modification at 8-10 ℃ below zero for 25-35min, and naturally heating to normal temperature;
And fifthly, drying at normal pressure to obtain the aerogel material.
2. The method for preparing aerogel materials according to claim 1, wherein step one is to heat the azobisisobutyronitrile powder gradually to be in a molten state, dissolve the azobisisobutyronitrile in the molten state in ethanol, and stir for 20-30min at 150-200r/min to obtain the stabilizer.
3. The method of producing aerogel material according to claim 2, wherein in the first step, the mass ratio of azobisisobutyronitrile to ethanol is 1.5-2:100-120.
4. A method of preparing aerogel materials as claimed in claim 3, wherein the azobisisobutyronitrile powder is heated to a temperature of 110 to 120 ℃.
5. The method for preparing aerogel materials according to claim 4, wherein the second step comprises grinding industrial silica slag containing silica as main component into powder, pickling with pickling solution for 1-2h, removing aluminum oxide and alkali, and drying at 40-50deg.C to obtain silicon precursor.
6. The method of claim 5, wherein the industrial silica powder is sieved through a 50-70 mesh sieve.
7. The method of claim 6, wherein the pH of the pickling solution is 2-3.
8. The method for preparing aerogel material according to claim 7, wherein the third step comprises adding 0.5-1 part of silicon precursor into 0.2-0.5 part of strong ammonia water, stirring for 10-15min at 150-200r/min to obtain activated silicon, adding the activated silicon into a stabilizer, and catalyzing for 2-3h to generate silica sol.
9. An aerogel material prepared by the method of preparing an aerogel material according to any of claims 1-8.
10. Use of the aerogel material of claim 9 in the preparation of waterproof river sand, waterproof quartz sand, desert modifiers, curing agents and waterproofing agents.
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