CN106745003A - A kind of one-step method silicon dioxide aerogel powder normal pressure fast preparation method - Google Patents
A kind of one-step method silicon dioxide aerogel powder normal pressure fast preparation method Download PDFInfo
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Abstract
The invention discloses a kind of one-step method silicon dioxide aerogel powder normal pressure fast preparation method, comprise the following steps：In S1, the acidic liquid for persistently stirring water glass solution addition, colloidal sol is obtained to addition water glass solution is stopped during pH=7 8；To adding drying control chemical additive to stir and evenly mix in colloidal sol, stop stirring, gelling is aging to obtain wet gel；S2, the wet gel in S1 is crushed, then exchange of solvent, silane coupler modified to obtain modified gel；Modified gel is added to the water stirring, normal pressure classification is dried to obtain silicon dioxide aerogel powder.Short preparation period of the present invention, low production cost, the silicon dioxide aerogel powder performance for preparing is good, and hydrophobicity is good, and tap density is low, and thermal conductivity factor is low, and porosity is high, and specific surface area is high, and pore-size distribution is more uniform.
Description
Technical field
The present invention relates to aerosil technical field, more particularly to a kind of one-step method silicon dioxide aerogel powder
Normal pressure fast preparation method.
Background technology
Aeroge is a kind of new material, is the current most light solid of quality, with great surface area (200-
1000m2/ g), high porosity (80-99.8%), density can as little as 0.003g/cm3, low thermal conductivity the features such as, aeroge is sometimes
Also referred to as " solid-state cigarette " or " frost smoke ".Based on these features cause aeroge heat preservation and insulation field, information, acoustic material,
The various fields such as catalysis aspect, environmental protection play the role of irreplaceable.
Aeroge was come out in 1931, first by Stanford University S.SKistler with sodium metasilicate be raw material using molten
Glue-gel method and Supercritical Drying Technology have successfully been obtained aeroge.But because the solvent exchange procedure of aeroge is cumbersome
And it is very long, its actual application value is not found in addition, aerogel material is not paid attention to and is developed.Until J B in 1966
Peri prepares aerosil using silicon vinegar through a step sol-gel process so that arid cycle greatly shortens, and promotes
The progress of aeroge.
At present, generally use soda acid two-step catalysis method and prepare SiO2Aeroge, so-called soda acid two-step catalysis refer to by
Silicon source, water and other solvents are mixed by proportioning, are first adjusted to certain pH value solution with acid, make silicon source abundant in acid condition
Hydrolysis, obtains being condensed the precursor of silicon, is subsequently adding base catalyst, accelerates polycondensation reaction, and gel is generated in basic solvent.
SiO prepared by soda acid two-step catalysis technique2Aeroge excellent performance, but have that production cost is higher and manufacturing cycle
More long the drawbacks of.One step acid catalysis process is simple, eliminates ion exchange process, can not only shorten manufacturing cycle, Er Qieke
To reduce production cost, but sample is compared with soda acid two-step catalysis technique obtained in a step acid catalysis technique, its tap density
Larger, average pore size is larger, and specific surface area is smaller, and thermal conductivity factor is also larger, and aeroge hole is less larger, pore-size distribution compared with
It is uneven.Therefore, prepared by SiO to a step acid catalysis2Airsetting adhesive process is studied, to obtain the SiO of excellent performance2Airsetting
Glue is significant.
The content of the invention
Based on the technical problem that background technology is present, it is normal that the present invention proposes a kind of one-step method silicon dioxide aerogel powder
Pressure fast preparation method, the present invention eliminates ion exchange process using a step acid catalysis technique, saves the consumption of bronsted lowry acids and bases bronsted lowry, energy
Shorten manufacturing cycle, reduce production cost, and shorten exchange of solvent, silane coupler modified time；Prepare
Silicon dioxide aerogel powder performance is good, and hydrophobicity is good, and tap density is low, and thermal conductivity factor is low, and porosity is high, and specific surface area is high,
Pore-size distribution is more uniform.
The present invention proposes a kind of one-step method silicon dioxide aerogel powder normal pressure fast preparation method, including following step
Suddenly：
In S1, the acidic liquid for persistently stirring water glass solution addition, water glass solution is added to stopping during pH=7-8
Obtain colloidal sol；To adding drying control chemical additive to stir and evenly mix in colloidal sol, stop stirring, gelling is aging to obtain wet gel；
S2, the wet gel in S1 is crushed, then exchange of solvent, silane coupler modified to obtain modified gel；Will be modified
Gel is added to the water stirring, and normal pressure classification is dried to obtain silicon dioxide aerogel powder.
Preferably, in S1, the speed of lasting stirring is 200-500r/min.
Preferably, in S1, the speed of lasting stirring can for 210,220,230,240,250,260,270,280,
290、300、310、320、330、340、350、360、370、380、390、400、410、420、430、440、450、460、470、
480 or 490r/min.
Preferably, in S1, mixed to drying control chemical additive stirring 4-6min is added in colloidal sol.
Preferably, in S1, gelling time is 2-10min.
Preferably, in S1, gelling time can be 3,4,5,6,7,8 or 9min.
Preferably, in S1, aging temperature is room temperature, and ageing time is 12-16h.
Preferably, in S1, aging temperature is room temperature, ageing time can for 12.5,13,13.5,14,14.5,15 or
15.5h。
Preferably, in S1, the mass fraction of water glass solution is 6.4-21.4wt%, and modulus of water glass is 2.5-
3.55。
Preferably, in S1, the mass fraction of water glass solution can for 7,7.5,8,8.5,9,9.5,10,10.5,11,
11.5、12、12.5、13、13.5、14、14.5、15、15.5、16、16.5、17、17.5、18、18.5、19、19.5、20、20.5
Or 21wt%.
Preferably, in S1, acidic liquid is hydrochloric acid, sulfuric acid or acetic acid.
Preferably, in S1, drying control chemical additive is formamide or DMF.
Preferably, in S1, the volume ratio of drying control chemical additive and colloidal sol is 1-2：100.
Preferably, in S1, the volume ratio of drying control chemical additive and colloidal sol can be 1.1：100、1.2：100、
1.3：100、1.4：100、1.5：100、1.6：100、1.7：100、1.8：100 or 1.9：100.
Preferably, in S2, modified gel is added into temperature to stir 4-5h in 45-60 DEG C of water.
Preferably, in S2, normal pressure classification is dry to be concretely comprised the following steps：40-60 DEG C is adjusted the temperature to, 0.5- is incubated
1.5h, is warming up to 95-105 DEG C, is incubated 1.5-2.5h, is warming up to 115-125 DEG C, is incubated 1.5-2.5h, is warming up to 140-160
DEG C, it is incubated 1.5-2.5h.
Preferably, in S2, normal pressure classification is dry to be concretely comprised the following steps：50 DEG C are adjusted the temperature to, 1h is incubated, is warming up to
100 DEG C, 2h is incubated, is warming up to 120 DEG C, be incubated 2h, be warming up to 150 DEG C, be incubated 2h.
Preferably, in S2, with non-polar solven, alcoholic solvent successively exchange of solvent 1-3h.
Preferably, wet gel, non-polar solven, the volume ratio of alcoholic solvent are 1：2-3：1-3.
Preferably, non-polar solven is at least in n-hexane, normal heptane, hexamethylene, pentane, petroleum ether, gasoline
Kind.
Preferably, alcoholic solvent is at least one in ethanol, methyl alcohol, isopropanol.
Preferably, in S2, wet gel, the volume ratio of silane coupler are 1：1-3.
Preferably, in S2, silane coupler is HMDO, trim,ethylchlorosilane, HMDS
In at least one.
Preferably, in S2, silane coupler is the mixture of HMDO and trim,ethylchlorosilane.
Preferably, in S2, silane coupler is the mixture of HMDO and trim,ethylchlorosilane, wherein,
The volume ratio of HMDO and trim,ethylchlorosilane is 3-4：1.
Above-mentioned water is deionized water.
Above-mentioned water glass solution is sodium silicate aqueous solution.
Above-mentioned " gelling " is some Polymer Solutions, is toughness working fluid, intermolecular to form network structure, dispersion
WATER AS FLOW MEDIUM is comprised in network structure, forms immobilising semi-solid thing, and this process is referred to as gelling.
The present invention is using cheap industrial waterglass as silicon source, reduces cost；One step acid catalysis is urged with the step of soda acid two
Change is compared, and a step acid catalysis technique eliminates the ion exchange process of complexity, is connect compared to soda acid two-step method and saves bronsted lowry acids and bases bronsted lowry
Consumption, it is time saving and energy saving, and reduce cost, it is that the large-scale production of aerosil is provided convenience condition；Using
The mixed liquor of trim,ethylchlorosilane and HMDO, can more preferable improved silica aeroge, while using six
Tetramethyldisiloxane is dissolved in trim,ethylchlorosilane and water insoluble characteristic so that water and the modified gel energy in organic phase
Enough it is easily carried out being separated, so as to not realize the phase separation of modified gel by exchange of solvent, eliminates solvent friendship
Process is changed, cost is reduced；The present invention is carried out in atmospheric conditions, and reaction temperature is not high, mild condition, simple to operate, peace
Preferably, cost is relatively low, is suitable to industrialized production for full property；The silicon dioxide aerogel powder excellent performance for preparing, hydrophobicity
Good, tap density is 0.120g/cm3Left and right, the equal 0.0225W/mK of thermal conductivity factor or so, porosity are 94% or so, compare table
Area is 970m2/ g or so, pore-size distribution is more uniform.
Brief description of the drawings
Fig. 1 is the SEM figures that the present invention prepares silicon dioxide aerogel powder.
Fig. 2 is the thermal multigraph that the present invention prepares silicon dioxide aerogel powder.
Specific embodiment
Below, technical scheme is described in detail by specific embodiment.
Embodiment 1
A kind of one-step method silicon dioxide aerogel powder normal pressure fast preparation method, comprises the following steps：
In S1, the acidic liquid for persistently stirring water glass solution addition, water glass solution is added to stopping during pH=7.5
Obtain colloidal sol；To adding drying control chemical additive to stir and evenly mix in colloidal sol, stop stirring, gelling is aging to obtain wet gel；
S2, the wet gel in S1 is crushed, then exchange of solvent, silane coupler modified to obtain modified gel；Will be modified
Gel is added to the water stirring, and normal pressure classification is dried to obtain silicon dioxide aerogel powder.
Embodiment 2
A kind of one-step method silicon dioxide aerogel powder normal pressure fast preparation method, comprises the following steps：
S1, by modulus be 3.55, mass fraction be 14wt% water glass solutions add persistently stirred with the speed of 200r/min
In the hydrochloric acid mixed, colloidal sol is obtained to addition water glass solution is stopped during pH=8；Mixed to formamide stirring 4min is added in colloidal sol
It is even, stop stirring, be gelled 10min, and aged at room temperature 15h obtains wet gel, wherein, the volume ratio of formamide and colloidal sol is 1.5：
100；
S2, the wet gel in S1 is crushed, it is silane coupler modified then with n-hexane, ethanol successively exchange of solvent 3h
Obtain modified gel；4.5h is stirred during modified gel is added into the water that temperature is 50 DEG C, 50 DEG C are adjusted the temperature to, 1h is incubated, risen
Temperature is incubated 2h to 100 DEG C, is warming up to 120 DEG C, is incubated 2h, is warming up to 150 DEG C, and insulation 2h obtains silicon dioxide aerogel powder,
Wherein, wet gel, n-hexane, the volume ratio of ethanol are 1：2：1, wet gel, the volume ratio of silane coupler are 1：1.5, silane
Coupling agent is the mixture of HMDO and trim,ethylchlorosilane, wherein, HMDO and trimethylchloro-silicane
The volume ratio of alkane is 3：1.
The gained silicon dioxide aerogel powder of embodiment 2 is detected, Fig. 1-2 is as a result seen；
Reference picture 1, Fig. 1 is the SEM figures that the present invention prepares silicon dioxide aerogel powder；Gas as seen from Figure 1
Gel aperture is more uniform.
Reference picture 2, Fig. 2 is the thermal multigraph that the present invention prepares silicon dioxide aerogel powder；Gas as seen from Figure 2
Gel in 350 DEG C or so loss of stability, with heat endurance higher.
Embodiment 3
A kind of one-step method silicon dioxide aerogel powder normal pressure fast preparation method, comprises the following steps：
S1, by modulus be 3.55, mass fraction be 10wt% water glass solutions add persistently stirred with the speed of 500r/min
In the hydrochloric acid mixed, colloidal sol is obtained to addition water glass solution is stopped during pH=7；Mixed to formamide stirring 6min is added in colloidal sol
It is even, stop stirring, be gelled 2min, and aged at room temperature 15h obtains wet gel, wherein, the volume ratio of formamide and colloidal sol is 1：100；
S2, the wet gel in S1 is crushed, it is silane coupler modified then with n-hexane, ethanol successively exchange of solvent 2h
Obtain modified gel；4h is stirred during modified gel is added into the water that temperature is 60 DEG C, 50 DEG C are adjusted the temperature to, 1h is incubated, heated up
To 100 DEG C, 2h is incubated, is warming up to 120 DEG C, be incubated 2h, be warming up to 150 DEG C, insulation 2h obtains silicon dioxide aerogel powder, its
In, wet gel, n-hexane, the volume ratio of ethanol are 1：2：1, wet gel, the volume ratio of silane coupler are 1：2, it is silane coupled
Agent is the mixture of HMDO and trim,ethylchlorosilane, wherein, HMDO and trim,ethylchlorosilane
Volume ratio is 4：1.
Embodiment 4
A kind of one-step method silicon dioxide aerogel powder normal pressure fast preparation method, comprises the following steps：
S1, by modulus be 3.55, mass fraction be 18wt% water glass solutions add persistently stirred with the speed of 300r/min
In the hydrochloric acid mixed, colloidal sol is obtained to addition water glass solution is stopped during pH=7；Mixed to formamide stirring 5min is added in colloidal sol
It is even, stop stirring, be gelled 8min, and aged at room temperature 14h obtains wet gel, wherein, the volume ratio of formamide and colloidal sol is 1：100；
S2, the wet gel in S1 is crushed, it is silane coupler modified then with n-hexane, ethanol successively exchange of solvent 1h
Obtain modified gel；4h is stirred during modified gel is added into the water that temperature is 50 DEG C, 50 DEG C are adjusted the temperature to, 1h is incubated, heated up
To 100 DEG C, 2h is incubated, is warming up to 120 DEG C, be incubated 2h, be warming up to 150 DEG C, insulation 2h obtains silicon dioxide aerogel powder, its
In, wet gel, n-hexane, the volume ratio of ethanol are 1：2：1, wet gel, the volume ratio of silane coupler are 1：2, it is silane coupled
Agent is the mixture of HMDO and trim,ethylchlorosilane, wherein, HMDO and trim,ethylchlorosilane
Volume ratio is 3.5：1.
Embodiment 5
A kind of one-step method silicon dioxide aerogel powder normal pressure fast preparation method, comprises the following steps：
S1, by modulus be 3.55, mass fraction be 8wt% water glass solutions add persistently stirred with the speed of 400r/min
Hydrochloric acid in, to during pH=7 stop add water glass solution obtain colloidal sol；Mixed to formamide stirring 5.5min is added in colloidal sol
It is even, stop stirring, be gelled 6min, and aged at room temperature 12h obtains wet gel, wherein, the volume ratio of formamide and colloidal sol is 1：100；
S2, the wet gel in S1 is crushed, it is silane coupler modified then with n-hexane, ethanol successively exchange of solvent 3h
Obtain modified gel；4h is stirred during modified gel is added into the water that temperature is 50 DEG C, 50 DEG C are adjusted the temperature to, 1h is incubated, heated up
To 100 DEG C, 2h is incubated, is warming up to 120 DEG C, be incubated 2h, be warming up to 150 DEG C, insulation 2h obtains silicon dioxide aerogel powder, its
In, wet gel, n-hexane, the volume ratio of ethanol are 1：2：1, wet gel, the volume ratio of silane coupler are 1：2, it is silane coupled
Agent is the mixture of HMDO and trim,ethylchlorosilane, wherein, HMDO and trim,ethylchlorosilane
Volume ratio is 3.8：1.
Embodiment 6
A kind of one-step method silicon dioxide aerogel powder normal pressure fast preparation method, comprises the following steps：
S1, by modulus be 2.5, mass fraction be 21.4wt% water glass solutions add persistently stirred with the speed of 250r/min
In the sulfuric acid mixed, colloidal sol is obtained to addition water glass solution is stopped during pH=7.2；To adding DMF in colloidal sol
Stirring 4.5min is mixed, and stops stirring, and be gelled 7min, and aged at room temperature 16h obtains wet gel, wherein, DMF
It is 1 with the volume ratio of colloidal sol：100；
S2, the wet gel in S1 is crushed, then with non-polar solven, alcoholic solvent successively exchange of solvent 1.5h, hexamethyl
Disilazane is modified to obtain modified gel；5h is stirred during modified gel is added into the water that temperature is 55 DEG C, 40 DEG C are adjusted the temperature to,
Insulation 1.5h, is warming up to 95 DEG C, is incubated 2.5h, is warming up to 115 DEG C, is incubated 2.5h, is warming up to 140 DEG C, and insulation 2.5h obtains two
Silica aerogel powder, wherein, wet gel, non-polar solven, the volume ratio of alcoholic solvent are 1：2：3, non-polar solven is ring
Hexane, pentane, the mixed solvent of petroleum ether, alcoholic solvent methyl alcohol, the mixed solvent of isopropanol, wet gel, the silicon nitrogen of hexamethyl two
The volume ratio of alkane is 1：1.
Embodiment 7
A kind of one-step method silicon dioxide aerogel powder normal pressure fast preparation method, comprises the following steps：
S1, by modulus be 3, mass fraction be 6.4wt% water glass solutions add persistently stirred with the speed of 400r/min
Acetic acid in, to during pH=7.8 stop add water glass solution obtain colloidal sol；Stirred to DMF is added in colloidal sol
Mix 5.5min mixings, stop stirring, be gelled 9min, and aged at room temperature 16h obtains wet gel, wherein, DMF and
The volume ratio of colloidal sol is 1：50；
S2, the wet gel in S1 is crushed, then with non-polar solven, methyl alcohol successively exchange of solvent 2.5h, hexamethyl two
It is silicone-modified to obtain modified gel；4.5h is stirred during modified gel is added into the water that temperature is 45 DEG C, 60 DEG C are adjusted the temperature to,
Insulation 0.5h, is warming up to 105 DEG C, is incubated 1.5h, is warming up to 125 DEG C, is incubated 1.5h, is warming up to 160 DEG C, and insulation 1.5h obtains two
Silica aerogel powder, wherein, wet gel, non-polar solven, the volume ratio of methyl alcohol are 1：3：1, non-polar solven is positive heptan
The mixed solvent of alkane, gasoline, wet gel, the volume ratio of HMDO are 1：3.
Test example 1
Using the water glass solution of identical weight, silicon dioxide aerogel powder is prepared according to soda acid two-step method, and with reality
Example 2 is applied to compare, it is as a result as follows：
The soda acid consumption of a step acidization is much smaller than soda acid two-step method as can be seen from the above table, and manufacturing cycle is greatly shortened,
Obtained silicon dioxide aerogel powder performance is equally excellent.
Test example 2
Performance test is carried out to embodiment 2-7, it is as a result as follows：
The obtained silicon dioxide aerogel powder excellent performance of the present invention as can be seen from the above table, hydrophobicity is good, vibration density
Degree is low, and thermal conductivity factor is low, and porosity is high, and specific surface area is high.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any one skilled in the art the invention discloses technical scope in, technology according to the present invention scheme and its
Inventive concept is subject to equivalent or change, should all be included within the scope of the present invention.
Claims (10)
1. a kind of one-step method silicon dioxide aerogel powder normal pressure fast preparation method, it is characterised in that comprise the following steps：
In S1, the acidic liquid for persistently stirring water glass solution addition, obtained to addition water glass solution is stopped during pH=7-8
Colloidal sol；To adding drying control chemical additive to stir and evenly mix in colloidal sol, stop stirring, gelling is aging to obtain wet gel；
S2, the wet gel in S1 is crushed, then exchange of solvent, silane coupler modified to obtain modified gel；By modified gel
It is added to the water stirring, normal pressure classification is dried to obtain silicon dioxide aerogel powder.
2. one-step method silicon dioxide aerogel powder normal pressure fast preparation method according to claim 1, it is characterised in that
In S1, the speed of lasting stirring is 200-500r/min；Preferably, in S1, added to drying control chemistry is added in colloidal sol
Agent stirring 4-6min is mixed.
3. one-step method silicon dioxide aerogel powder normal pressure fast preparation method according to claim 1 or claim 2, its feature exists
In in S1, gelling time is 2-10min；Preferably, in S1, aging temperature is room temperature, and ageing time is 12-16h.
4. the one-step method silicon dioxide aerogel powder normal pressure fast preparation method according to claim any one of 1-3, it is special
Levy and be, in S1, the mass fraction of water glass solution is 6.4-21.4wt%, and modulus of water glass is 2.5-3.55.
5. the one-step method silicon dioxide aerogel powder normal pressure fast preparation method according to claim any one of 1-4, it is special
Levy and be, in S1, acidic liquid is hydrochloric acid, sulfuric acid or acetic acid.
6. the one-step method silicon dioxide aerogel powder normal pressure fast preparation method according to claim any one of 1-5, it is special
Levy and be, in S1, drying control chemical additive is formamide or DMF；Preferably, in S1, dry
The volume ratio for controlling chemical addition agent and colloidal sol is 1-2：100.
7. the one-step method silicon dioxide aerogel powder normal pressure fast preparation method according to claim any one of 1-6, it is special
Levy and be, in S2, modified gel is added into temperature to stir 4-5h in 45-60 DEG C of water.
8. the one-step method silicon dioxide aerogel powder normal pressure fast preparation method according to claim any one of 1-7, it is special
Levy and be, in S2, normal pressure classification is dry to be concretely comprised the following steps：40-60 DEG C is adjusted the temperature to, 0.5-1.5h is incubated, is warming up to
95-105 DEG C, 1.5-2.5h is incubated, is warming up to 115-125 DEG C, be incubated 1.5-2.5h, be warming up to 140-160 DEG C, be incubated 1.5-
2.5h。
9. the one-step method silicon dioxide aerogel powder normal pressure fast preparation method according to claim any one of 1-8, it is special
Levy and be, in S2, with non-polar solven, alcoholic solvent successively exchange of solvent 1-3h；Preferably, wet gel, non-polar solven, alcohol
The volume ratio of solvent is 1：2-3：1-3；Preferably, non-polar solven is n-hexane, normal heptane, hexamethylene, pentane, oil
At least one in ether, gasoline；Preferably, alcoholic solvent is at least one in ethanol, methyl alcohol, isopropanol.
10. the one-step method silicon dioxide aerogel powder normal pressure fast preparation method according to claim any one of 1-9, it is special
Levy and be, in S2, wet gel, the volume ratio of silane coupler are 1：1-3；Preferably, in S2, silane coupler is pregnancy
At least one in base disiloxane, trim,ethylchlorosilane, HMDS；Preferably, in S2, silane coupler is
The mixture of HMDO and trim,ethylchlorosilane；Preferably, in S2, silane coupler is HMDO
With the mixture of trim,ethylchlorosilane, wherein, the volume ratio of HMDO and trim,ethylchlorosilane is 3-4：1.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109399645A (en) * | 2018-12-12 | 2019-03-01 | 陕西科诺材料科技有限公司 | A kind of SiO without solvent displacement2The atmospheric preparation method of aeroge |
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| CN113023737A (en) * | 2021-03-08 | 2021-06-25 | 山西阳中新材有限责任公司 | Preparation method of aerogel not prone to powder falling |
| CN114132936A (en) * | 2021-01-11 | 2022-03-04 | 上海联锴日用化工有限公司 | Preparation method of graded porous spherical silicon dioxide aerogel with low thermal conductivity |
| CN115417416A (en) * | 2022-08-31 | 2022-12-02 | 中国科学技术大学先进技术研究院 | Silica aerogel powder and method for producing same |
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| CN111183113A (en) * | 2018-02-14 | 2020-05-19 | 株式会社Lg化学 | Method for producing hydrophobic silica aerogel particles |
| CN111183113B (en) * | 2018-02-14 | 2023-03-24 | 株式会社Lg化学 | Method for producing hydrophobic silica aerogel particles |
| CN109399645A (en) * | 2018-12-12 | 2019-03-01 | 陕西科诺材料科技有限公司 | A kind of SiO without solvent displacement2The atmospheric preparation method of aeroge |
| CN111154167A (en) * | 2019-03-18 | 2020-05-15 | 罗瑞尔纳米合成材料(江苏)有限公司 | Heat-insulating polyethylene composite material and preparation method thereof |
| CN114132936B (en) * | 2021-01-11 | 2023-09-15 | 上海联锴新材料有限公司 | Preparation method of graded porous spherical silica aerogel with low thermal conductivity |
| CN114132936A (en) * | 2021-01-11 | 2022-03-04 | 上海联锴日用化工有限公司 | Preparation method of graded porous spherical silicon dioxide aerogel with low thermal conductivity |
| CN113023737A (en) * | 2021-03-08 | 2021-06-25 | 山西阳中新材有限责任公司 | Preparation method of aerogel not prone to powder falling |
| CN113023737B (en) * | 2021-03-08 | 2023-09-29 | 山西阳中新材有限责任公司 | Preparation method of aerogel not easy to fall off powder |
| CN115417416A (en) * | 2022-08-31 | 2022-12-02 | 中国科学技术大学先进技术研究院 | Silica aerogel powder and method for producing same |
| CN115432710A (en) * | 2022-09-16 | 2022-12-06 | 西安科技大学 | Preparation method of ultra-low density silicon dioxide aerogel block |
| CN115710372A (en) * | 2022-11-01 | 2023-02-24 | 武汉中科先进材料科技有限公司 | Preparation method of aerogel composite material |
| CN115710372B (en) * | 2022-11-01 | 2024-04-19 | 武汉中科先进材料科技有限公司 | Preparation method of aerogel composite material |
| CN116553565B (en) * | 2023-07-12 | 2023-09-08 | 廊谷(天津)新材料科技有限公司 | Preparation method of silica aerogel powder |
| CN116553565A (en) * | 2023-07-12 | 2023-08-08 | 廊谷(天津)新材料科技有限公司 | Preparation method of silica aerogel powder |
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