CN104338511A - Hydrophobic lipophilic silica aerogel taking alkoxy silane as raw material - Google Patents
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
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- B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
- B01J20/28078—Pore diameter
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- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
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- B01J13/0065—Preparation of gels containing an organic phase
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
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- B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
- B01J20/28088—Pore-size distribution
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
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- B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
- B01J20/28095—Shape or type of pores, voids, channels, ducts
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- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4812—Sorbents characterised by the starting material used for their preparation the starting material being of organic character
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Abstract
The invention discloses hydrophobic lipophilic silica aerogel taking alkoxy silane as a raw material, and a preparation method thereof. The kind of silica aerogel is mainly applied to fields of air purification, sewage processing, chemical engineering purification, medicine filtering and the like. The main preparation method comprises: taking the alkoxy silane with the formula XSi(OY)3 as the raw material, adding a proper solvent, an acidic aqueous solution and an alkali aqueous solution to form a gel, ageing, and directly performing normal-pressure drying, so as to prepare the hydrophobic lipophilic silica aerogel. The average pore diameter, the pore diameter distribution, the porosity and the like of the sample are measured by utilizing a N2 adsorption/desorption method, and the product density is measured by utilizing a full-automatic true density analyzer, and the results show that the average pore diameter is less than 10 nm, the pore diameter distribution is 2-10 nm, the porosity is larger than 85% and the density is less than 0.15 g/cm<3>.
Description
Technical field
The present invention relates to a kind of take alkoxy silane as hydrophobic close ester silica aerogel and the preparation process thereof of raw material, and the application in the field such as this aeroge is purified at purification of air, sewage disposal, chemical industry, medicine filtration.
Background technology
Filtration and sorbing material have been widely used in the different field such as purification of air, sewage disposal, chemical industry purification.Granular active carbon, NACF, silica gel are the sorbing materials that application is wider at present, but these materials have its unfavorable factor.Such as, NACF is expensive, and intensity is poor.This kind of absorbent charcoal material has certain water characterization of adsorption, for process containing steam waste gas or in wet environment application be disadvantageous.Further, because active carbon itself is flammable, in absorption and the regeneration occasion of a large amount of combustible solvent, easily produce thermal-arrest effect, there is potential safety hazard, need corresponding auxiliary security facility, improve operating cost.The specific area of common silica gel is generally less than 400m
2/ g, its porosity is also only about 30% ~ 60%, therefore its adsorption rate is general, and surface hydrophilic, wet still can reduce its adsorption efficiency.
Silica aerogel is that one includes large quantity of air, the porous amorphous solid-state material of low-density, high porosity, its porosity can reach more than 90%, and typical bore hole size is at 1 ~ 100nm scope (Journal of the Chinese Ceramic Society, 2007,35(8): 1081-1085).Silica aerogel is in many-sided character all demonstrating uniqueness such as mechanics, acoustics, calorifics, optics, they are obviously different from the porous material of pore space structure in millimeter and micron dimension, its very thin nanostructured makes the thermal conductivity of material extremely low, has great specific area.Therefore, silica aerogel has broad application prospects, and as transparent thermal insulation material, refrigerator heat-insulating material, acoustic impedance coupling material, can also be used for the aspects such as super capacitor material, new gas filter, new catalyst or catalyst carrier.Compare traditional absorbent charcoal material, the adsorptivity of silica aerogel is eager to excel many, and its adsorption capacity exceeds two orders of magnitude (Journal of Non-Crystalline Solids, 2004,350:224-229) than the granular active carbon of equivalent.But the hydrophily of aeroge limits its utilization in some field, meet water or steam can make its structure change, lose its original distinctive character.
The working system method of existing hydrophobicity silica aerogel, in the domestic and international scientific paper published, its preparation is mostly with four alkoxyl silicones for raw material, does additive with the organosilicon of alkyl silicate and so on, then adopts supercritical fluid technique to carry out dry.Patent CN200510012186.3 report utilizes rice hull ash to prepare hydrophobic silicon dioxide aerogel for raw material, can obtain surface and have good hydrophobic silica aerogel.Patent CN201110118807.1 reports that MTES is that flexible silicon aeroge prepared by raw material has the advantages that density is low, good springiness, hydrophobicity are good.The article being published in (Journal of Materials Chemistry, 2011,21,17077-17079) report by MTMS and dimethyldimethoxysil,ne be raw material prepare there is hydrophobic silica aerogel.The article being published in (Angew.Chem.Int.Ed.2013,52,1-5) reports the application of preparation by hydrophobic porous aeroge and oily water separation technique.
General patent technology and bibliographical information, the present invention reaches the character such as aperture, porosity, specific area changing end product silica aerogel by the proportioning of feed change, thus reaches and all have good assimilation effect to volatile organic matter of different nature.Meanwhile, silica aerogel of the present invention is a kind of compound of hydrophobic close ester, ensure that in wet condition to the adsorption efficiency of organic gas, and preparation method is simple, is applicable to suitability for industrialized production.
Summary of the invention
The object of this invention is to provide a kind of take alkoxy silane as the silica aerogel with excellent hydrophobic close ester performance of raw material, there is good porosity, aperture, specific area simultaneously, in fields such as purification of air, sewage disposal, chemical industry purification, medicine filtrations, there is excellent effect.
For the ease of understanding technical scheme of the present invention, first term involved in the present invention is defined as follows:
" alkoxy silane " of the present invention refers to that structural formula is XSi(OY)
3compound, such as: MTMS, ethyl trimethoxy silane, propyl trimethoxy silicane etc., vinyltrimethoxy silane, n-pro-pyl trimethoxy silane, mercaptopropyl trimethoxysilane, n-octyl trimethoxy silane, r-chloropropyl trimethoxyl silane etc.
" solvent " of the present invention refers to methyl alcohol, ethanol, normal propyl alcohol, isopropyl alcohol, n-butanol, isobutanol, ethylene glycol, acetone or its mixture.
" acidic aqueous solution " of the present invention refers to the aqueous solution of hydrochloric acid, sulfuric acid, acetic acid, oxalic acid, citric acid, tartaric acid, malic acid or its mixture.
" alkaline aqueous solution " of the present invention refers to the aqueous solution of ammoniacal liquor, ammonium carbonate, carbonic hydroammonium, urea, a n-butylamine, monoethanolamine or its mixture.
To achieve these goals, present invention employs following technical scheme:
The present invention mainly with the alkoxy silane of single alkoxy silane or mixing for raw material, add appropriate solvent and 10mM acidic aqueous solution and 10M alkaline aqueous solution gel, by the continuous displacement of organic solvent, dry at normal temperatures, obtain hydrophobic close ester silica aerogel, concrete steps are as follows:
Step 1: the alkoxy silane of alkoxy silane single for 1mol or 1mol mixing is added in 20 ~ 50mol solvent, then adds the acidic aqueous solution that 50 ~ 90mL concentration is 10mM, stir at 15 ~ 40 DEG C after 0.5 ~ 2 hour and leave standstill 6 ~ 24 hours;
Step 2: add the alkaline aqueous solution that 50 ~ 90mL concentration is 10M in the mixture of step 1, stirs after 0.5 ~ 2 hour, leaves standstill at 20 ~ 60 DEG C at 15 ~ 40 DEG C.Continue after forming gel to leave standstill 24 ~ 96 hours at 20 ~ 60 DEG C, within every 24 hours, remove original solution therebetween, add fresh solvent, solvent and gel volume are than being 1:1 ~ 3;
Step 3: all poured out by the solvent of step 2, the gel after aging at 40 ~ 60 DEG C dry 12 hours, continues dry 12 hours at being warming up to 90 ~ 110 DEG C, finally obtains hydrophobic close ester silica aerogel.
Described raw material alkoxy silane is formula XSi(OY)
3a kind of compound or a kind of mixture of compound, wherein X is selected from: methyl, ethyl, propyl group, isobutyl group, mercapto propyl group, chloropropyl, vinyl, n-octyl, pi-allyl, dodecyl, cetyl, octadecyl or phenyl; Y is selected from: the alkyl of C1-C4.MTMS is not comprised when described raw material alkoxy silane is a kind of compound; It is the mixture of 2 ~ 6 kinds of compounds when described raw material alkoxy silane is the mixture of more than one compounds.
Preferably, described raw material alkoxy silane is formula XSi(OY)
3compound, wherein X is preferably from methyl, ethyl, propyl group, chloropropyl or vinyl; Y is preferably from methyl or ethyl.
Single alkoxy silane in described step 1 or the alkoxy silane of mixing and the mol ratio of solvent are preferably 1:30 ~ 40.
Solvent in described step 1 is: methyl alcohol, ethanol, normal propyl alcohol, isopropyl alcohol, n-butanol, isobutanol, ethylene glycol, acetone or its mixture;
Solvent in described step 1 is preferably: methyl alcohol, ethanol or acetone.
Single alkoxy silane in described step 1 or the alkoxy silane of mixing mole be preferably 1mol:65 ~ 80mL with the volume ratio of acidic aqueous solution.
The acid of described acidic aqueous solution is: hydrochloric acid, sulfuric acid, acetic acid, oxalic acid, citric acid, tartaric acid, malic acid or its mixture;
The acid of described acidic aqueous solution is preferably: hydrochloric acid, acetic acid or oxalic acid.
Single alkoxy silane in described step 2 or the alkoxy silane of mixing mole be preferably 1mol:65 ~ 80mL with the volume ratio of alkaline aqueous solution.
Alkali in described alkaline aqueous solution is: ammoniacal liquor, ammonium carbonate, carbonic hydroammonium, urea, a n-butylamine, monoethanolamine or its mixture;
Alkali in described alkaline aqueous solution is preferably: ammoniacal liquor or urea.
Beneficial effect of the present invention:
1) possess the feature of low aperture, high porosity, high close ester with single alkoxy silane or mixed oxyalkyl silane for hydrophobic close ester silica aerogel prepared by raw material, for organic absorption, there is extraordinary effect;
2) be that hydrophobic close ester silica aerogel prepared by raw material all has good assimilation effect to heterogeneity organic matter by different ratio mixed oxyalkyl silane;
3) preparation method of the present invention is simple and convenient, easily realizes suitability for industrialized production.
Detailed description of the invention
Embodiment 1:
Alkyl silicon alkoxide ethyl trimethoxy silane (15.0g, 0.1mol) is added in methyl alcohol (112g, 3.5mol), then add 10mM oxalic acid aqueous solution (7.2g), stir after 1 hour and leave standstill 24 hours.Then 10M ammonia aqueous solution (7.2g) is added, stir room temperature after 1 hour and be settled into gel, after becoming gel, 30 DEG C of continuation (pour out residual solvent in every 24 hours in aging 48 hours, add fresh solvent), by gel 40 DEG C of dryings after aging 12 hours, 80 DEG C of dryings 12 hours, finally obtain hydrophobicity silica aerogel.Profit N
2the specific area, average pore size, pore-size distribution etc. of adsorption/desorption method to sample are tested, and utilize health tower ULTRAPYC1200E full-automatic real density analyzer to carry out test to product density and obtain result as follows: average pore size 5.939nm, pore-size distribution 2-10nm, density 0.11g/cm
3, porosity 87%.
Embodiment 2:
According to embodiment 1, except replacing outside ethyl trimethoxy silane with vinyltrimethoxy silane (14.8g, 0.1mol), after all the other methods similarly to Example 1 prepare aeroge, then under the condition that embodiment 1 is identical, carry out drying, finally obtain hydrophobicity silica aerogel.Profit N
2the specific area, average pore size, pore-size distribution etc. of adsorption/desorption method to sample are tested, and utilize health tower ULTRAPYC1200E full-automatic real density analyzer to carry out test to product density and obtain result as follows: average pore size 7.390nm, pore-size distribution 2-10nm, density 0.12g/cm
3, porosity 90%.
Embodiment 3:
According to embodiment 1, except replacing 10mM oxalic acid aqueous solution with 10mM acetic acid aqueous solution (7.2g), then all the other carry out drying after preparing gel with the method that embodiment 1 is same under the condition that embodiment 1 is identical, finally obtains hydrophobicity silica aerogel.
Embodiment 4:
According to embodiment 1, except replacing outside methyl alcohol with isopropyl alcohol (210g, 3.5mol), then all the other carry out drying after preparing gel with the method that embodiment 1 is same under the condition that embodiment 1 is identical, finally obtains hydrophobicity silica aerogel.
Embodiment 5:
According to embodiment 1, except replacing ammoniacal liquor with 10M methylamine water solution (7.2g), then all the other carry out drying after preparing gel with the method that embodiment 1 is same under the condition that embodiment 1 is identical, finally obtains hydrophobicity silica aerogel.
Embodiment 6:
Alkyl silicon alkoxide ethyl trimethoxy silane (7.5g, 0.05mol) and vinyltrimethoxy silane (7.4g, 0.05mol) are added in methyl alcohol (112g, 3.5mol).Then 10mM oxalic acid aqueous solution (7.2g) is added, stir after 1 hour and leave standstill 24 hours, then 10M ammonia aqueous solution (7.2g) is added, stir room temperature after 1 hour and be settled into gel, 30 DEG C are become after gel to continue aging 48 hours (pour out residual solvent, add fresh solvent for every 24 hours), by gel 40 DEG C of dryings after aging 12 hours, 80 DEG C of dryings 12 hours, finally obtain hydrophobicity silica aerogel.Profit N
2the specific area, average pore size, pore-size distribution etc. of adsorption/desorption method to sample are tested, and utilize health tower ULTRAPYC1200E full-automatic real density analyzer to carry out test to product density and obtain result as follows: average pore size 6.901nm, pore-size distribution 2-10nm, density 0.12g/cm
3, porosity 88%.
Embodiment 7:
According to embodiment 6, except replacing outside vinyltrimethoxy silane with n-pro-pyl trimethoxy silane (8.2g, 0.05mol), after all the other methods similarly to Example 6 prepare aeroge, then under the condition that embodiment 6 is identical, carry out drying, finally obtain hydrophobicity silica aerogel.Profit N
2the specific area, average pore size, pore-size distribution etc. of adsorption/desorption method to sample are tested, and utilize health tower ULTRAPYC1200E full-automatic real density analyzer to carry out test to product density and obtain result as follows: average pore size 5.741nm, pore-size distribution 2-10nm, density 0.11g/cm
3, porosity 91%.
Embodiment 8:
According to embodiment 6, except replacing outside ethyl trimethoxy silane with MTMS (6.8g, 0.05mol), then all the other carry out drying, obtain silica aerogel after preparing gel with the method that embodiment 6 is same under the condition that embodiment 6 is identical.
Embodiment 9:
By alkyl silicon alkoxide MTMS (6.8g, 0.05mol), vinyltrimethoxy silane (7.4g, 0.05mol), propyl trimethoxy silicane (0.82g, 5mmol) add methyl alcohol (112g, 3.5mol), then 10mM oxalic acid aqueous solution (7.2g) is added, stir after 1 hour and leave standstill 24 hours, then 10M ammonia aqueous solution (7.2g) is added, stir room temperature after 1 hour and be settled into gel, after becoming gel, 40 DEG C of continuation (pour out residual solvent in every 24 hours in aging 96 hours, add fresh solvent), by gel 40 DEG C of dryings after aging 12 hours, 80 DEG C of dryings 12 hours, finally obtain hydrophobicity silica aerogel.
Embodiment 10:
According to embodiment 9, except replacing outside vinyltrimethoxy silane with mercaptopropyl trimethoxysilane (9.8g, 0.05mol), after all the other prepare gel with the method that embodiment 9 is same, then under the condition that embodiment 9 is identical, carry out drying, finally obtain hydrophobicity silica aerogel.
Embodiment 11:
By alkyl silicon alkoxide MTMS (6.8g, 0.05mol), vinyltrimethoxy silane (7.4g, 0.05mol), n-pro-pyl trimethoxy silane (0.82g, 5mmol), mercaptopropyl trimethoxysilane (0.98g, 5mmol) add in methyl alcohol (123g, 3.85mol).Then 10mM oxalic acid aqueous solution (7.9g) is added, stir after 1 hour and leave standstill 24 hours, then 10M ammonia aqueous solution (7.9g) is added, stir room temperature after 1 hour and be settled into gel, 25 DEG C are become after gel to continue aging 96 hours (pour out residual solvent, add fresh solvent for every 24 hours), by gel 40 DEG C of dryings after aging 12 hours, 80 DEG C of dryings 12 hours, finally obtain hydrophobicity silica aerogel.
Embodiment 12:
By alkyl silicon alkoxide MTMS (6.8g, 0.05mol), vinyltrimethoxy silane (7.42g, 0.05mol), n-pro-pyl trimethoxy silane (0.82g, 5mmol), mercaptopropyl trimethoxysilane (0.98g, 5mmol), n-octyl trimethoxy silane (1.17g, 5mmol) add in methyl alcohol (125g, 3.9mol).Then 10mM oxalic acid aqueous solution (8.0g) is added, stir after 1 hour and leave standstill 24 hours, then 10M ammonia aqueous solution (8.0g) is added, stir room temperature after 1 hour and be settled into gel, 25 DEG C are become after gel to continue aging 96 hours (pour out residual solvent, add fresh solvent for every 24 hours), by gel 40 DEG C of dryings after aging 12 hours, 80 DEG C of dryings 12 hours, finally obtain hydrophobicity silica aerogel.
Embodiment 13:
By alkyl silicon alkoxide MTMS (6.8g, 0.05mol), vinyltrimethoxy silane (7.42g, 0.05mol), n-pro-pyl trimethoxy silane (0.82g, 5mmol), mercaptopropyl trimethoxysilane (0.98g, 5mmol), n-octyl trimethoxy silane (1.17g, 5mmol), 3-r-chloropropyl trimethoxyl silane (0.99g, 5mmol) adds in methyl alcohol (134g, 4.2mol).Then 10mM oxalic acid aqueous solution (8.64g) is added, stir after 1 hour and leave standstill 24 hours, then 10M ammonia aqueous solution (8.64g) is added, stir room temperature after 1 hour and be settled into gel, 25 DEG C are become after gel to continue aging 96 hours (pour out residual solvent, add fresh solvent for every 24 hours), by gel 40 DEG C of dryings after aging 12 hours, 80 DEG C of dryings 12 hours, finally obtain hydrophobicity silica aerogel.
Claims (10)
1. be a hydrophobic close ester silica aerogel prepared by raw material with alkoxy silane, it is characterized in that: described raw material alkoxy silane is formula XSi (OY)
3a kind of compound or the mixture of more than one compounds, wherein X is selected from: methyl, ethyl, propyl group, isobutyl group, mercapto propyl group, chloropropyl, vinyl, n-octyl, pi-allyl, dodecyl, cetyl, octadecyl or phenyl; Y is selected from: the alkyl of C1-C4; MTMS is not comprised when described raw material alkoxy silane is a kind of compound; It is the mixture of 2 ~ 6 kinds of compounds when described raw material alkoxy silane is mixture.
2. according to claim 1 take alkoxy silane as hydrophobic close ester silica aerogel prepared by raw material, it is characterized in that: described raw material alkoxy silane is formula XSi (OY)
3a kind of compound or the mixture of more than one compounds, wherein X is preferably from methyl, ethyl, propyl group, chloropropyl or vinyl; Y is preferably from methyl or ethyl.
3. be hydrophobic close ester silica aerogel prepared by raw material with alkoxy silane according to claim 1,2, its preparation method comprises the following steps:
Step 1: the alkoxy silane of alkoxy silane single for 1mol or 1mol mixing is added in 20 ~ 50mol solvent, then adds the acidic aqueous solution that 50 ~ 90mL concentration is 10mM, stir at 15 ~ 40 DEG C after 0.5 ~ 2 hour and leave standstill 6 ~ 24 hours;
Step 2: add the alkaline aqueous solution that 50 ~ 90mL concentration is 10M in the mixture of step 1, stirs after 0.5 ~ 2 hour, leaves standstill at 20 ~ 60 DEG C at 15 ~ 40 DEG C.Continue after forming gel to leave standstill 24 ~ 96 hours at 20 ~ 60 DEG C, within every 24 hours, remove original solution therebetween, add fresh solvent, solvent and gel volume are than being 1:1 ~ 3;
Step 3: all poured out by the solvent of step 2, the gel after aging at 40 ~ 60 DEG C dry 12 hours, continues dry 12 hours at being warming up to 90 ~ 110 DEG C, finally obtains hydrophobic close ester silica aerogel.
4. according to claim 3 take alkoxy silane as hydrophobic close ester silica aerogel prepared by raw material, it is characterized in that:
Single alkoxy silane in step 1 or the alkoxy silane of mixing and the mol ratio of solvent are preferably 1:30 ~ 40, and described solvent is: methyl alcohol, ethanol, normal propyl alcohol, isopropyl alcohol, n-butanol, isobutanol, ethylene glycol, acetone or its mixture.
5. according to claim 3 take alkoxy silane as hydrophobic close ester silica aerogel prepared by raw material, it is characterized in that:
Single alkoxy silane in step 1 or the alkoxy silane of mixing mole be preferably 1mol:65 ~ 80mL with the volume ratio of acidic aqueous solution, the acid of described acidic aqueous solution is: hydrochloric acid, sulfuric acid, acetic acid, oxalic acid, citric acid, tartaric acid, malic acid or its mixture.
6. according to claim 3 take alkoxy silane as hydrophobic close ester silica aerogel prepared by raw material, it is characterized in that:
Single alkoxy silane in step 1 or the alkoxy silane of mixing mole be preferably 1mol:65 ~ 80mL with the volume ratio of alkaline aqueous solution, the alkali in described alkaline aqueous solution is: ammoniacal liquor, ammonium carbonate, carbonic hydroammonium, urea, a n-butylamine, monoethanolamine or its mixture.
7. take alkoxy silane as hydrophobic close ester silica aerogel prepared by raw material according to claim 1-6, it is characterized in that: its aperture is 2 ~ 30nm, is preferably 2 ~ 10nm.
8. take alkoxy silane as hydrophobic close ester silica aerogel prepared by raw material according to claim 1-6, it is characterized in that: its density is 0.05 ~ 0.30g/cm
3, be preferably 0.10 ~ 0.15g/cm
3.
9. take alkoxy silane as hydrophobic close ester silica aerogel prepared by raw material according to claim 1-6, it is characterized in that: its porosity is 80 ~ 95%, is preferably 85 ~ 95%.
10. take alkoxy silane as hydrophobic close ester silica aerogel prepared by raw material according to claim 1-9, it is characterized in that: the application being mainly used in the fields such as purification of air, sewage disposal, chemical industry purification, medicine filtration.
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| CN108047478A (en) * | 2018-02-02 | 2018-05-18 | 兰州交通大学 | A kind of atmospheric preparation method of organic silica aerogel |
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| CN106747562B (en) * | 2016-12-07 | 2019-07-12 | 河南城建学院 | A kind of Silica Aerogels and preparation method suitable for making superadiabatic visual window |
| CN108623832A (en) * | 2017-03-24 | 2018-10-09 | 中国科学院化学研究所 | A kind of polysilsesquioxane aerogel and preparation method thereof |
| CN108047478A (en) * | 2018-02-02 | 2018-05-18 | 兰州交通大学 | A kind of atmospheric preparation method of organic silica aerogel |
| CN108047478B (en) * | 2018-02-02 | 2020-10-16 | 兰州交通大学 | Normal-pressure preparation method of organic silicon aerogel |
| CN110787745A (en) * | 2019-11-29 | 2020-02-14 | 福建六树网络科技有限公司 | Preparation method of silicon dioxide aerogel composite material and silicon dioxide aerogel composite material |
| CN110787745B (en) * | 2019-11-29 | 2021-11-05 | 安徽信义光伏玻璃有限公司 | Preparation method of silicon dioxide aerogel composite material and silicon dioxide aerogel composite material |
| CN113680288A (en) * | 2020-05-18 | 2021-11-23 | 淮阴工学院 | Preparation method of hydrophobic attapulgite composite aerogel |
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Application publication date: 20150211 |