CN110127705A - A kind of preparation method for the fire-retardant silica aerogel that graphene oxide is modified - Google Patents
A kind of preparation method for the fire-retardant silica aerogel that graphene oxide is modified Download PDFInfo
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- CN110127705A CN110127705A CN201910399214.3A CN201910399214A CN110127705A CN 110127705 A CN110127705 A CN 110127705A CN 201910399214 A CN201910399214 A CN 201910399214A CN 110127705 A CN110127705 A CN 110127705A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/182—Graphene
- C01B32/198—Graphene oxide
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
- C01B33/155—Preparation of hydroorganogels or organogels
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
- C01B33/157—After-treatment of gels
- C01B33/158—Purification; Drying; Dehydrating
- C01B33/1585—Dehydration into aerogels
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
Abstract
The invention discloses a kind of preparation methods of the modified fire-retardant silica aerogel of graphene oxide, comprising steps of silane coupling agent, acid catalyst, surfactant and water are mixed, adjust pH to 2~5, stirring, hydrolysis obtain silicon sol solution；Base catalyst is added into obtained silicon sol solution, stirs, graphene oxide is added after adjusting pH to 9~11, stirring, ultrasound obtain graphene oxide-silane mixture solution；Obtained graphene oxide-silane mixture solution is transferred in closed container, after reacting 48~56h at 80~90 DEG C, carries out solvent displacement washing, normal temperature and pressure is drying to obtain the modified fire-retardant silica aerogel of graphene oxide.The modified fire-retardant silica aerogel of graphene oxide that preparation method of the present invention is prepared not only excellent fireproof performance, applies also for the fields such as heat preserving and insulating material, sound-absorbing material, adsorbent material.
Description
Technical field
The present invention relates to organic silica aerogel technical fields, and in particular to a kind of fire-retardant silicon airsetting that graphene oxide is modified
The preparation method of glue.
Background technique
Since aerogel material comes out for the first time within 1931, due to its low-density, high porosity, high-specific surface area and low lead
Hot equal special performances, cause the extensive concern of various circles of society, have been applied to building trade, communications and transportation, petroleum industry, boat
The fields such as empty space flight, national defence.Wherein, silica aerogel is due to ultralow thermal coefficient and brilliant high and low temperature resistance, scientific research people
Member is prepared for heat-insulation and heat-preservation aerosil felt, as disclosed in the patent specification of Publication No. CN108585762A,
Excellent heat insulating effect can be reached using very thin material.However, traditional aerosil preparation is often
The drying condition of the valuableness such as supercritical drying, freeze-drying is needed, preparation process is complicated, is not suitable for large-scale production.
Silica aerogel is prepared under condition of normal pressure in order to realize, Kazuyoshi Kanamori reports a kind of constant pressure and dry
The silica aerogel (J.Mater.Chem., 2011,21,17077-17079) of organic-inorganic polymerization is formed molten by control soda acid
Glue-gel, so that constant pressure and dry prepares a kind of flexible silica aerogel of excellent in mechanical performance.In addition, Publication No.
The patent specification of CN107523275A discloses a kind of preparation method of flexible aerosil base phase change composite material,
The degree of cross linking inside aeroge is changed by the way that trimethylmethoxysilane is added, thus make aeroge that there is flexibility, it is final to make
For a kind of adjustable flexible aeroge of pore size.The patent specification of Publication No. CN108641361A discloses a kind of fibre
The preparation method for tieing up the organosilicon aerogel heat-proof composite material of enhancing adds using the siloxane polymer of porous structure as matrix
Add flexible fiber felt by preparing organic silicon solution, solution impregnated flexible fibrofelt, then after sol-gel, washing-drying
Finally obtained organosilicon aerogel heat-proof composite material.
However, the organic silica aerogel and its composite material of above-mentioned room temperature preparation are a large amount of due to existing on its silane molecule
Organic group, and adding or be modified object is mostly combustible material, it is caused not have good flame retardant property.It adds or is modified
These materials can be thermally decomposed when encountering high temperature and flame, or even be burnt, and then lead to organic silica aerogel and its compound
The material property and structure serious deterioration of material, it is difficult to meet in practical application and such material Green Flammability performance is wanted substantially
It asks.
Summary of the invention
For shortcoming existing for this field, the present invention provides a kind of modified fire-retardant silica aerogels of graphene oxide
Preparation method, graphene oxide environmentally protective, that lightweight is high-elastic modified fire-retardant silicon can be obtained under the conditions of constant pressure and dry
Aeroge.Using graphene oxide composite material and micro-nano structure silica cooperative flame retardant, overcome tradition has the preparation method
The problems such as machine silica aerogel and thermal insulation material inflammability.Preparation method green is simple, can extensive industrialization, to develop resistance
Combustion, heat-insulated organic Silica Aerogels provide a kind of new approaches.
A kind of preparation method for the fire-retardant silica aerogel that graphene oxide is modified, comprising steps of
(1) silane coupling agent, acid catalyst, surfactant and water are mixed, adjusts pH to 2~5, stirs, hydrolyzes
To silicon sol solution；
(2) base catalyst is added into obtained silicon sol solution, stirs, graphite oxide is added after adjusting pH to 9~11
Alkene, stirring, ultrasound obtain graphene oxide-silane mixture solution；
(3) obtained graphene oxide-silane mixture solution is transferred in closed container, reacts 48 at 80~90 DEG C
After~56h, solvent displacement washing is carried out, normal temperature and pressure is drying to obtain the modified fire-retardant silica aerogel of graphene oxide.
The present invention is based on surface of graphene oxide to contain a large amount of hydroxyl group, can participate in silane molecule hydrolysis and condensation
Reaction constructs out three-dimensional highly cross-linked aeroge network structure using the two chemical crosslinking effect, has been surprisingly found that collaboration enhancing
Aeroge afterwards not only mechanical property be greatly improved and also its not easy to crack in the drying process to be able to maintain skeleton complete
It is whole, and compared with pure organic silica aerogel lose powder phenomenon be improved significantly, more confirm graphene oxide bridging silicon
Alkane particle cooperates with reinforced structure.
From microcosmic angle analysis graphene oxide, silica particles fit together reduces its aperture diameter, lamellar structure
Graphene oxide and silica particles can limit the movement of gas molecule, the effective transmitting for preventing heat further increases
Heat-proof quality.
Graphene oxide can not be fire-retardant, and traditional organic silica aerogel is also combustible material, and the two is cooperateed with and handed over by the present invention
It is linked togather and constructs close reticular structure, but play good flame retardant effect；Further characterization display, graphene oxide
The transmission for not only obstructing air is introduced, and can effectively resist the attack of flame, cooperates with Green Flammability with silicone molecules realization,
Solve the problems, such as that the heat-insulated aeroge of organosilicon but can not be fire-retardant for a long time.
Preferably, in step (1), in parts by weight, the silane coupling agent, acid catalyst, surfactant and
The additional amount of water is respectively as follows:
Further preferably, in step (2), in parts by weight, the additional amount of the base catalyst is 10~20 parts, described
Graphene oxide additional amount be X parts, 0 X≤5 <.Micro-oxidation graphene synergistic effect, which is added, can reach excellent
Fire-retardant and mechanical property.
To guarantee frame strength that subsequent wet gel is formed, preferably, the silane coupling agent includes tri-alkoxy
Silane and bis-alkoxysilane, and trialkoxy silane and the mass ratio of bis-alkoxysilane are 1.2~1.8:1.This content model
Enclosing outer wet gel can not form.
Preferably, the trialkoxy silane is selected from methyltrimethoxysilane, ethyl trimethoxy silane, methyl
At least one of triethoxysilane and ethyl triethoxysilane.
Preferably, the bis-alkoxysilane be selected from dimethyldimethoxysil,ne, ethyldimethoxysilane and
At least one of ethyl diethoxy silane.
Preferably, the acid catalyst is selected from acetic acid, at least one of hydrochloric acid, nitric acid and citric acid.The acid
The additional amount of catalyst is measured with the pH to 2~5 of the silicon sol solution of regulating step (1).
Preferably, the surfactant is selected from cetyl trimethylammonium bromide (CTAB), cetyl front three
At least one of ammonium chloride (CTAC), Varisoft 432PPG and octadecyltrimethylammonium chloride.
Preferably, the base catalyst is selected from least one of urea, ammonium hydroxide and tetramethylammonium hydroxide.It is described
The additional amount of base catalyst is measured with the pH to 9~11 of the silicon sol solution of regulating step (2).
Preferably, the graphene oxide is the graphene oxide of micro-meter scale, having a size of 30~100 μm.This ruler
Very little graphene oxide sheet can be uniformly distributed in gel, construct aeroge skeleton conducive to collaboration.
Preferably, graphene oxide solution, the graphene oxide is added after adjusting pH to 9~11 in step (2)
Solution is dissolved in water rear ultrasonic disperse by graphene oxide and obtains.
Preferably, the solvent displacement washing is carried out in two steps, and the solvent that the first step uses is selected from step (3)
Ethyl alcohol and/or isopropanol wash away unreacted raw material；Second step use low surface tension solvent, selected from n-hexane, normal heptane and
At least one of normal octane, it is cheap and have lower surface can, it is washed after aeroge during constant pressure and dry
Skeleton is able to maintain not to be destroyed.
Consider that energy consumption and efficiency further preferably in each step of the solvent displacement washing, carry out solvent displacement 3
~4 times, the time of each solvent displacement is 6~10h.Preferred washing times and time can complete sufficiently in the shortest time
Displacement.
The modified fire-retardant silica aerogel of graphene oxide that preparation method of the present invention is prepared not only flame retardant property
It is excellent, apply also for the fields such as heat preserving and insulating material, sound-absorbing material, adsorbent material.
Compared with prior art, the present invention major advantage includes:
(1) graphene oxide and organosilicon cooperative flame retardant are constructed a kind of novel flame-retardant Silica Aerogels by the present invention, should
Material preparation process is nontoxic, preparation condition normal temperature and pressure, without harsh conditions such as supercritical dryings, and be prepared
Material has low thermal conductivity, low-density, high resiliency, excellent compression performance and hydrophobic performance.
(2) present invention has constructed a kind of sheet carbon material and micro nano structure dioxy silicon particle cooperative flame retardant from microstructure
System provides new approaches in dissipation capacity to silica aerogel；Heat-insulating flame-retardant silica aerogel of the present invention not only has in building field
Application prospect, and in railway traffic, the fields such as petrochemical industry can be all widely used.
Detailed description of the invention
Fig. 1 is the modified aerogels sample A of embodiment 1 and the burning of the unmodified aeroge sample B of comparative example 1 compares in fact
Passport control examination of passports piece；
Fig. 2 is that the compression restorability of the 1.0wt% graphene oxide modified aerogels of embodiment 2 shows photo.
Specific embodiment
With reference to the accompanying drawing and specific embodiment, the present invention is further explained.It should be understood that these embodiments are merely to illustrate
The present invention rather than limit the scope of the invention.In the following examples, the experimental methods for specific conditions are not specified, usually according to
Normal condition, or according to the normal condition proposed by manufacturer.
Embodiment 1
By methyltrimethoxysilane 3g, dimethyldimethoxysil,ne 2g, acetic acid 0.005g, CTAB (cetyl three
Methyl bromide ammonium) 0.8g, water 15g is added sequentially in beaker, and magnetic agitation 30min is fully hydrolyzed silane；Then by urea
5g is added in the solution hydrolyzed, is vigorously stirred 10min；Graphene oxide 50mg is taken later, is added in silicon sol solution,
It is sufficiently stirred and is ultrasonically treated 5min；The solution handled well is poured into mold, encapsulation process, is placed on 48h in 80 DEG C of baking ovens,
Completely reacted modified silicon wet gel is taken out, successively solvent is replaced in isopropanol, n-hexane, and every kind of solvent is replaced three times, often
Secondary displacement 10h, normal temperature and pressure is dry after the completion of displacement can be obtained the modified silica aerogel of 2.0wt% graphene oxide, be denoted as sample
Product A.As shown in Figure 1, the alcolhol burner combustion testing of sample A is not the results show that the modified silica aerogel of 2.0wt% graphene oxide can
It burns, alcolhol burner is removed after the 5s that burns, sample A forms self-extinguishment effect, and skeleton remains intact, and sample A is environmentally protective, does not have
Toxic gas is generated, there is good flame retardant property.
Comparative example 1
By methyltrimethoxysilane 3g, dimethyldimethoxysil,ne 2g, acetic acid 0.005g, CTAB (cetyl three
Methyl bromide ammonium) 0.8g, water 15g is added sequentially in beaker, and magnetic agitation 30min is fully hydrolyzed silane；Then by urea
5g is added in the solution that hydrolysis is completed, and is vigorously stirred 10min；The solution handled well is poured into mold, encapsulation process, is placed
The 48h in 80 DEG C of baking ovens；Then silicon wet gel reaction completed takes out, and successively solvent is replaced in isopropanol, n-hexane, often
The displacement of kind solvent three times, replaces 10h every time, and pure silica aerogel can be obtained in normal temperature and pressure drying after the completion of displacement, is denoted as sample
Product B.As shown in Figure 1, the alcolhol burner combustion test test result of sample B shows that pure silica aerogel burns rapidly, after the 5s that burns
Alcolhol burner, sample B sustained combustion are removed, and skeleton is destroyed, cannot keep its original pattern.
Embodiment 2
By methyltrimethoxysilane 3g, dimethyldimethoxysil,ne 2g, acetic acid 0.005g, CTAB (cetyl three
Methyl bromide ammonium) 0.8g, water 15g is added sequentially in beaker, and magnetic agitation 30min is fully hydrolyzed silane；Then by urea
5g is added in the solution hydrolyzed, is vigorously stirred 10min；Graphene oxide 25mg is taken later, is added in silicon sol solution,
It is sufficiently stirred and is ultrasonically treated 5min；The solution handled well is poured into mold, encapsulation process, is placed on 48h in 80 DEG C of baking ovens,
Completely reacted modified silicon wet gel is taken out, successively solvent is replaced in isopropanol, n-hexane, and every kind of solvent is replaced three times, often
Secondary displacement 10h, normal temperature and pressure is dry after the completion of displacement can be obtained the modified silica aerogel of graphene oxide.As shown in Fig. 2,
1.0wt% graphene oxide modified aerogels have high resiliency, and compression restorability is excellent, have it in building field wide
Application prospect.
Embodiment 3
By methyltrimethoxysilane 3g, dimethyldimethoxysil,ne 2g, acetic acid 0.005g, CTAC (cetyl three
Ammonio methacrylate) 0.6g, water 15g is added sequentially in beaker, and magnetic agitation 30min is fully hydrolyzed silane；Then by urea
5g is added in the solution hydrolyzed, is vigorously stirred 10min；Graphene oxide 70mg is taken later, is added in silicon sol solution,
It is sufficiently stirred and is ultrasonically treated 5min；The solution handled well is poured into mold, encapsulation process, is placed on 48h in 80 DEG C of baking ovens,
Completely reacted modified silicon wet gel is taken out, successively solvent is replaced in isopropanol, n-hexane, and every kind of solvent is replaced three times, often
Secondary displacement 8h, normal temperature and pressure is dry after the completion of displacement can be obtained the modified silica aerogel of graphene oxide.With no modified airsetting
Glue is compared, and the flame retardant effect of the modified aeroge of graphene oxide significantly improves, its structure, sample will not be damaged under flame condition
Product are environmentally protective, do not generate toxic gas.
Embodiment 4
By methyltrimethoxysilane 3g, dimethyldimethoxysil,ne 2g, hydrochloric acid 0.005g, CTAC (cetyl three
Ammonio methacrylate) 0.6g, water 15g is added sequentially in beaker, and magnetic agitation 30min is fully hydrolyzed silane；Then by urea
5g is added in the solution hydrolyzed, is vigorously stirred 10min；Graphene oxide 20mg is taken later, is added in silicon sol solution,
It is sufficiently stirred and is ultrasonically treated 5min；The solution handled well is poured into mold, encapsulation process, is placed on 48h in 80 DEG C of baking ovens,
Completely reacted modified silicon wet gel is taken out, successively solvent is replaced in isopropanol, n-hexane, and every kind of solvent is replaced three times, often
Secondary displacement 8h, normal temperature and pressure is dry after the completion of displacement can be obtained the modified silica aerogel of graphene oxide.With no modified gas
Gel is compared, and the flame retardant effect of the modified aeroge of graphene oxide significantly improves, its structure will not be damaged under flame condition,
Sample is environmentally protective, does not generate toxic gas.
Embodiment 5
By ethyl trimethoxy silane 3g, dimethyl diethoxysilane 2g, nitric acid 0.005g, CTAB (cetyl three
Methyl bromide ammonium) 0.8g, water 15g is added sequentially in beaker, and magnetic agitation 30min is fully hydrolyzed silane；Then by urea
3g is added in the solution hydrolyzed, is vigorously stirred 10min；Graphene oxide 25mg is taken later, is added in silicon sol solution,
It is sufficiently stirred and is ultrasonically treated 5min；The solution handled well is poured into mold, encapsulation process, is placed on 48h in 80 DEG C of baking ovens,
Completely reacted modified silicon wet gel is taken out, successively solvent is replaced in isopropanol, n-hexane, and every kind of solvent is replaced three times, often
Secondary displacement 8h, normal temperature and pressure is dry after the completion of displacement can be obtained the modified silica aerogel of graphene oxide.With no modified gas
Gel is compared, and the flame retardant effect of the modified aeroge of graphene oxide significantly improves, its structure will not be damaged under flame condition,
Sample is environmentally protective, does not generate toxic gas.
Embodiment 6
By methyltriethoxysilane 3g, dimethyl diethoxysilane 2g, acetic acid 0.005g, CTAB (cetyl three
Methyl bromide ammonium) 0.8g, water 15g is added sequentially in beaker, and magnetic agitation 30min is fully hydrolyzed silane；Then by urea
4g is added in the solution hydrolyzed, is vigorously stirred 10min；Graphene oxide 20mg is taken later, is added in silicon sol solution,
It is sufficiently stirred and is ultrasonically treated 5min；The solution handled well is poured into mold, encapsulation process, is placed on 56h in 90 DEG C of baking ovens,
Completely reacted modified silicon wet gel is taken out, successively solvent is replaced in isopropanol, n-hexane, and every kind of solvent is replaced three times, often
Secondary displacement 8h, normal temperature and pressure is dry after the completion of displacement can be obtained the modified fire-retardant silica aerogel of graphene oxide.With do not change
Property aeroge compare, the flame retardant effect of the modified aeroge of graphene oxide significantly improves, and will not damage it under flame condition
Structure, sample is environmentally protective, does not generate toxic gas.
Embodiment 7
By methyltriethoxysilane 3g, diethyldiethoxysilane 2g, acetic acid 0.005g, CTAB (cetyl three
Methyl bromide ammonium) 0.6g, water 15g is added sequentially in beaker, and magnetic agitation 30min is fully hydrolyzed silane；Then by urea
5g is added in the solution hydrolyzed, is vigorously stirred 10min；Graphene oxide 20mg is taken later, is added in silicon sol solution,
It is sufficiently stirred and is ultrasonically treated 5min；The solution handled well is poured into mold, encapsulation process, is placed on 56h in 90 DEG C of baking ovens,
Completely reacted modified silicon wet gel is taken out, successively solvent is replaced in isopropanol, n-hexane, and every kind of solvent is replaced three times, often
Secondary displacement 8h, normal temperature and pressure is dry after the completion of displacement can be obtained the modified fire-retardant silica aerogel of graphene oxide.With do not change
Property aeroge compare, the flame retardant effect of the modified aeroge of graphene oxide significantly improves, and will not damage it under flame condition
Structure, sample is environmentally protective, does not generate toxic gas.
In addition, it should also be understood that, those skilled in the art can be to this hair after having read foregoing description content of the invention
Bright to make various changes or modifications, these equivalent forms also fall within the scope of the appended claims of the present application.
Claims (10)
1. a kind of preparation method of the modified fire-retardant silica aerogel of graphene oxide, comprising steps of
(1) silane coupling agent, acid catalyst, surfactant and water are mixed, adjusts pH to 2~5, stirring, hydrolysis obtain silicon
Sol solution；
(2) base catalyst is added into obtained silicon sol solution, stirs, graphene oxide is added after adjusting pH to 9~11, stirs
It mixes, ultrasound obtains graphene oxide-silane mixture solution；
(3) obtained graphene oxide-silane mixture solution is transferred in closed container, at 80~90 DEG C react 48~
After 56h, solvent displacement washing is carried out, normal temperature and pressure is drying to obtain the modified fire-retardant silica aerogel of graphene oxide.
2. the preparation method of the modified fire-retardant silica aerogel of graphene oxide according to claim 1, which is characterized in that step
Suddenly in (1), in parts by weight, the silane coupling agent, acid catalyst, surfactant and water additional amount be respectively as follows:
3. the preparation method of the modified fire-retardant silica aerogel of graphene oxide according to claim 2, which is characterized in that step
Suddenly in (2), in parts by weight, the additional amount of the base catalyst is 10~20 parts.
4. the preparation method of the modified fire-retardant silica aerogel of graphene oxide according to claim 2 or 3, feature exist
In in step (2), in parts by weight, the additional amount of the graphene oxide is X parts, 0 X≤5 <.
5. the preparation method of the modified fire-retardant silica aerogel of graphene oxide according to claim 1, which is characterized in that institute
The silane coupling agent stated includes trialkoxy silane and bis-alkoxysilane；
The trialkoxy silane and the mass ratio of bis-alkoxysilane are 1.2~1.8:1.
6. the preparation method of the modified fire-retardant silica aerogel of graphene oxide according to claim 1, which is characterized in that institute
The acid catalyst stated is selected from acetic acid, at least one of hydrochloric acid, nitric acid and citric acid.
7. the preparation method of the modified fire-retardant silica aerogel of graphene oxide according to claim 1, which is characterized in that institute
The surfactant stated is selected from cetyl trimethylammonium bromide, hexadecyltrimethylammonium chloride, di-cetyl dimethyl
At least one of ammonium chloride and octadecyltrimethylammonium chloride.
8. the preparation method of the modified fire-retardant silica aerogel of graphene oxide according to claim 1, which is characterized in that institute
The base catalyst stated is selected from least one of urea, ammonium hydroxide and tetramethylammonium hydroxide.
9. the preparation method of the modified fire-retardant silica aerogel of graphene oxide according to claim 1, which is characterized in that institute
The size for the graphene oxide stated is 30~100 μm.
10. the preparation method of the modified fire-retardant silica aerogel of graphene oxide according to claim 1, which is characterized in that
The solvent displacement washing is carried out in two steps, and the solvent that the first step uses is selected from ethyl alcohol and/or isopropanol；Second step uses low
Surface tension solvent, selected from least one of n-hexane, normal heptane and normal octane.
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| CN110745835A (en) * | 2019-11-29 | 2020-02-04 | 福建六树网络科技有限公司 | Preparation method of silicon dioxide/graphene composite aerogel and composite aerogel obtained by preparation method |
| CN111253615A (en) * | 2020-02-24 | 2020-06-09 | 杭州师范大学 | Super-hydrophobic organic silicon aerogel and normal-temperature normal-pressure drying preparation method and application thereof |
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| CN115028883A (en) * | 2022-06-10 | 2022-09-09 | 龚伟锋 | Preparation method of flame-retardant silica aerogel |
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