CN1281484C - Method for preparing carbon gas gel - Google Patents
Method for preparing carbon gas gel Download PDFInfo
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- CN1281484C CN1281484C CN 200410027355 CN200410027355A CN1281484C CN 1281484 C CN1281484 C CN 1281484C CN 200410027355 CN200410027355 CN 200410027355 CN 200410027355 A CN200410027355 A CN 200410027355A CN 1281484 C CN1281484 C CN 1281484C
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- 238000000034 method Methods 0.000 title claims abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title 1
- 229910052799 carbon Inorganic materials 0.000 title 1
- 239000004964 aerogel Substances 0.000 claims abstract description 75
- GHMLBKRAJCXXBS-UHFFFAOYSA-N resorcinol Chemical compound OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000001035 drying Methods 0.000 claims abstract description 30
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims abstract description 23
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 239000000178 monomer Substances 0.000 claims abstract description 7
- 239000004094 surface-active agent Substances 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000012298 atmosphere Substances 0.000 claims abstract description 5
- DAJSVUQLFFJUSX-UHFFFAOYSA-M sodium;dodecane-1-sulfonate Chemical compound [Na+].CCCCCCCCCCCCS([O-])(=O)=O DAJSVUQLFFJUSX-UHFFFAOYSA-M 0.000 claims abstract description 5
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 4
- 239000002904 solvent Substances 0.000 claims abstract description 4
- 239000000017 hydrogel Substances 0.000 claims description 20
- 235000011194 food seasoning agent Nutrition 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 8
- 238000003763 carbonization Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 claims description 3
- JRMUNVKIHCOMHV-UHFFFAOYSA-M tetrabutylammonium bromide Chemical compound [Br-].CCCC[N+](CCCC)(CCCC)CCCC JRMUNVKIHCOMHV-UHFFFAOYSA-M 0.000 claims description 3
- 238000009472 formulation Methods 0.000 claims description 2
- 239000011261 inert gas Substances 0.000 claims description 2
- 239000000376 reactant Substances 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 abstract description 13
- 239000003054 catalyst Substances 0.000 abstract description 3
- 239000004966 Carbon aerogel Substances 0.000 abstract 4
- 238000010000 carbonizing Methods 0.000 abstract 1
- 238000009776 industrial production Methods 0.000 abstract 1
- 239000003708 ampul Substances 0.000 description 10
- 239000012153 distilled water Substances 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000000499 gel Substances 0.000 description 6
- 239000013543 active substance Substances 0.000 description 4
- 239000002105 nanoparticle Substances 0.000 description 4
- 230000003993 interaction Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- 238000000352 supercritical drying Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 235000011089 carbon dioxide Nutrition 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 206010013786 Dry skin Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000010165 autogamy Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003937 drug carrier Substances 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000007863 gel particle Substances 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
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Abstract
The present invention relates to organic aerogel and a preparation method of carbon aerogel by drying at normal pressure. The method has the steps: using resorcine and formaldehyde as reaction monomers, organic surface active agents (such as hexadecyltrimethylammonium bromide and sodium dodecanesulphonate) as emulsifiers and catalysts, and water as a solvent, and heating and solidifying the reaction monomers, the emulsifiers, the catalysts and the solvent to obtain organogel; directly and naturally drying or heating and drying the organogel to obtain organic aerogel; carbonizing the organic aerogel in inert atmosphere to obtain carbon aerogel with high specific surface area. The organic aerogel and the carbon aerogel of the present invention have the advantages of simple and fast preparation process, low equipment requirement and environment protection, and the industrial production of carbon aerogel can be realized.
Description
Technical field
The present invention relates to the atmosphere pressure desiccation preparation technology of block organic aerogel of a kind of low density and charcoal-aero gel thereof.
Technical background
Because the nano-particle network structure of charcoal-aero gel uniqueness, abundant mesopore, characteristics such as bigger serface and excellent conductive performance, it just is being developed and is being used in electrode, catalyzer and support of the catalyst, gas filtering material, pharmaceutical carrier, infrared ray absorption material and the specific acoustic resistance coupling material of making ultracapacitor, and good market outlook are arranged.So at present, the preparation research of relevant charcoal-aero gel constantly causes people's attention both at home and abroad.Since the eighties in 20th century, Pekala prepared charcoal-aero gel first, existing many preparations, structure and application achievements were delivered.
Yet the problem of charcoal-aero gel existence in preparation is at present seriously restricting its practical application in electrode for capacitors and other fields, also seriously hampers the development of charcoal-aero gel theory and applied research.At present, the charcoal-aero gel technology of comparative maturity is the dry preparation of the CO 2 supercritical technology of preparing of Pekala invention, but this Technology Need experience: " water-sol is synthetic-hydrogel-organic solvent exchange one be full of the gel-carbon dioxide exchange of organic solvent-the be full of gel-supercritical drying-organic aerogel-charing-charcoal-aero gel of carbonic acid gas " tediously long like this and complex process, preparation cycle is long, carries out the liquid CO of supercritical drying mass consumption
2, production efficiency is low, and product cost height, the organic solvent of exchange are difficult for reclaiming not environmental protection.Theoretical and the industrial application requirements consideration from synthetic; aspect the preparation of charcoal-aero gel; the technical barrier that people attempt to capture always is exactly to abandon supercritical drying commonly used; and adopt the constant pressure and dry technology to prepare the organic aerogel presoma; could fundamentally simplify the production technique and the production unit of charcoal-aero gel like this, reduce production costs, reduce a large amount of carbonic acid gas and organic solvent emission simultaneously; help protecting environment, thereby promote the mass-producing and the suitability for industrialized production of charcoal-aero gel.
Why the past people will can not prepare the organic aerogel presoma with the constant pressure and dry technology with Supercritical Drying Technology, and its reason is, unsuitable constant pressure and dry can cause the nanoparticle structure of gel to be subsided, and charcoal particulate size and porosity are destroyed.People it is generally acknowledged, cause such result's factor to have two.One can produce huge capillary pressure when being these gel dryings and causes subsiding of granulation mass stack structure; It is more weak that another is that the nanoparticle of these gels piles up formed skeleton.
Summary of the invention
The object of the present invention is to provide the atmosphere pressure desiccation preparation technology of block organic aerogel of a kind of low density and charcoal-aero gel thereof.
For achieving the above object, the present invention is with Resorcinol and formaldehyde (formalin, 37～40wt%) is reaction monomers, organic surface active agent (for example, cetyl trimethylammonium bromide, sodium laurylsulfonate) as emulsifying agent and catalyzer, water is solvent, in be heating and curing between room temperature～100 ℃ hydrogel; Then, directly seasoning or heating, drying get organic aerogel; Afterwards, charing gets the charcoal-aero gel of high-specific surface area in inert atmosphere; Used each material mixture ratio is: Resorcinol (R) is 0.2～1.3 with the mol ratio R/F of formaldehyde (F); The mol ratio R/C of Resorcinol and tensio-active agent (C) is 10～2000; Reactant total concn (RF%) is 10～80wt%.
The concrete processing step of the inventive method is:
(1). Resorcinol, formaldehyde, water and tensio-active agent (catalyzer) are mixed and stir according to predetermined formulation, pour in the reaction flask afterwards and sealing, (be generally 10 hours～10 days) more than 10 hours in heating between room temperature～100 ℃ and obtain hydrogel;
(2). place the air seasoning (to be generally 3～10 days) more than 3 days the hydrogel of (1) gained or first seasoning is about (was generally 5～24 hours) direct heating oven dry then more than 5 hours and (was generally 1～48 hour) more than 1 hour and obtains organic aerogel.
(3). the organic aerogel of (2) gained is placed charring furnace, heat charing under protection of inert gas, carbonization temperature (is generally 600～1100 ℃) more than 600 ℃; carbonization time (was generally 60～300 ℃) more than 60 minutes; naturally product is taken out in cooling cooling afterwards, obtains charcoal-aero gel.
The invention provides the new way that a hydrogel constant pressure and dry prepares novel charcoal-aero gel.That is, adopt the distribution and the interaction of tensio-active agent emulsion process control monomer and catalyzer, make suitable hydrogel, constant pressure and dry afterwards, charing makes charcoal-aero gel.The gel of this prepared does not shrink (gel particle skeleton collapse phenomenon can not occur) substantially in the constant pressure and dry process, particle size is little, the porosity height, and specific surface area is big.Compared with prior art, technology of the present invention and simple equipments, control is easy, and preparation time shortens, and cost reduces, and helps environmental protection, easier mass-producing and suitability for industrialized production.This is having greatly improved aspect preparation of charcoal-aero gel, plays an important role for the application that promotes charcoal-aero gel.
Principal feature of the present invention is: (1) adopts the water-soluble polymeric monomer; (2) when gel polymerisation, adopt suitable tensio-active agent and control it and the interaction of polymerization single polymerization monomer and catalyzer, thus in the control gelation process nanoparticle size of aerogel precursor body with pile up situation; (3) interaction between the enhanced granule improves gel skeleton intensity, reduces capillary pressure; (4) the constant pressure and dry hydrogel prepares the charcoal-aero gel presoma.
Prepared organic aerogel of the present invention and charcoal-aero gel thereof contain abundant mesopore, micropore and some macropores, and the BET specific surface area is up to 700m
2G
-1, mesopore volume is up to 1.2cm
3G
-1And preparation technology is simple, quick, equipment requirements is low, can realize the suitability for industrialized production of charcoal-aero gel.
Below the invention will be further described by drawings and Examples.
Description of drawings
Fig. 1 is the SEM figure of the organic aerogel for preparing of the present invention;
Fig. 2 is the SEM figure of the charcoal-aero gel for preparing of the present invention;
Fig. 3 is some organic aerogels that prepare of the present invention and the nitrogen adsorption isothermal line of charcoal-aero gel thereof; Wherein the prescription of RFA-42, RFA-43 is respectively R/F=0.5, RF%=40wt%, R/C=100,200 (C is a cetyl trimethylammonium bromide), and CA-42 and CA-43 are respectively the charcoal-aero gel that organic aerogel RFA-42 and RFA-43 charing obtain.
From Fig. 1～as can be seen shown in Figure 3: the prepared charcoal-aero gel of the present invention contains abundant microporous, mesopore and some macropores, and the BET specific surface area is up to 700m
2G
-1, mesopore volume is up to 1.2cm
3G
-1, the network particle diameter is about 20～50 nanometers.
Embodiment
Embodiment 1: according to R/F=0.5, R/C=100 (C is a cetyl trimethylammonium bromide), RF%=40wt%, with 1 gram Resorcinol, 1.26 milliliters of formalin (37～40wt%, this paper calculates prescription with 38.5wt%), 0.0331 gram cetyl trimethylammonium bromide and 1.46 ml distilled waters mix and stir, pour in the ampoule afterwards and sealing, reaction obtained hydrogel in 5 days under 85 ℃; Seasoning half a day, infrared lamp oven dry (about 60 ℃ of drying position) 5 hours in air then, put into the last drying and dewatering of baking oven (110 ℃) 5 hours subsequently, obtain organic aerogel.The density that records organic aerogel is 0.452gcm
-3, with theoretical density 0.449gcm
-3Very approaching; The BET specific surface area is 282m
2G
-1, mesopore volume 1.1cm
3G
-1, the mesopore aperture is about 18nm.
Embodiment 2: according to R/F=0.5, R/C=200 (C is a sodium laurylsulfonate), RF%=40wt%, 1 gram Resorcinol, 1.26 milliliters of formalins, 0.0124 gram sodium laurylsulfonate and 1.46 ml distilled waters are mixed and stir, pour in the ampoule afterwards and sealing, reaction obtained hydrogel in 1 day under 85 ℃; Seasoning 1 day in air then, infrared lamp are dried (about 60 ℃ of drying position) 5 hours, were put into the last drying and dewatering of baking oven (110 ℃) 5 hours subsequently, obtain organic aerogel.The density that records organic aerogel is 0.452gcm
-3, with theoretical density 0.448gcm
-3Very approaching.The BET specific surface area is 227m
2G
-1, mesopore volume 0.52cm
3G
-1, mean pore size 10.6nm.
Embodiment 3: according to R/F=0.5, R/C=100 (C is a Tetrabutyl amonium bromide), RF%=40wt%, 1 gram Resorcinol, 1.26 milliliters of formalins, 0.0293 gram Tetrabutyl amonium bromide and 1.46 ml distilled waters are mixed and stir, pour in the ampoule afterwards and sealing, reaction obtained hydrogel in 5 days under 85 ℃; Seasoning half a day, infrared lamp oven dry (about 60 ℃ of drying position) 5 hours in air then, put into the last drying and dewatering of baking oven (110 ℃) 5 hours subsequently, obtain organic aerogel.The density that records organic aerogel is 0.559gcm
-3, with theoretical density 0.448gcm
3More approaching.
Embodiment 4: according to R/F=0.5, R/C=200 (C is a cetyl trimethylammonium bromide), RF%=40wt%, 1 gram Resorcinol, 1.26 milliliters of formalins, 0.0165 gram cetyl trimethylammonium bromide and 1.46 ml distilled waters are mixed and stir, pour in the ampoule afterwards and sealing, reaction obtained hydrogel in 5 days under 85 ℃; Seasoning more than 5 hours in air then, infrared lamp oven dry (about 60 ℃ of drying position) 5 hours, put into the last drying and dewatering of baking oven (110 ℃) 5 hours subsequently; obtain organic aerogel; afterwards; organic aerogel is placed desk-top charring furnace; under the protection of high pure nitrogen, be warming up to 900 ℃ with 5 ℃/minute heating rate from room temperature; constant temperature charing 1 80 minutes, charcoal-aero gel is taken out in cooling cooling naturally.The density that records organic aerogel is 0.434gcm
-3, with theoretical density 0.447gcm
-3Very approaching, the BET specific surface area is 228m
2G
-1, mesopore volume 0.67cm
3G
-1The density of charcoal-aero gel is 0.504gcm
-3, the charing yield is 49%, the BET specific surface area is 682m
2G
-1, mesopore volume 1.2cm
3G
-1
Embodiment 5: according to R/F=0.5, R/C=1000 (C is a cetyl trimethylammonium bromide), RF%=40wt%, with 1 gram Resorcinol, 1.26 milliliters of formalins, (autogamy of 0.33 milliliter of cetyl trimethylammonium bromide aqueous solution, concentration is 1wt%) and 1.13 ml distilled waters mix and stir, pour in the ampoule afterwards and sealing, reaction obtained hydrogel in 5 days under 85 ℃; Dry (about 60 ℃ of drying position) 5 hours, put into the last drying and dewatering of baking oven (110 ℃) 5 hours subsequently at infrared lamp then; obtain organic aerogel; afterwards; organic aerogel is placed desk-top charring furnace; under the protection of high pure nitrogen, be warming up to 900 ℃ with 5 ℃/minute heating rate from room temperature; constant temperature charing 180 minutes, charcoal-aero gel is taken out in cooling cooling naturally.The density that records organic aerogel is 0.417gcm
-3, with theoretical density 0.444gcm
-3Very approaching, the BET specific surface area is 54m
2G
-1The density of charcoal-aero gel is 0.388gcm
-3, the charing yield is 45.6%, the BET specific surface area is 777m
2G
-1
Embodiment 6: according to R/F=0.8, R/C=200 (C is a cetyl trimethylammonium bromide), RF%=40wt%, 1 gram Resorcinol, 0.79 milliliter of formalin, 0.0165 gram cetyl trimethylammonium bromide and 1.46 ml distilled waters are mixed and stir, pour in the ampoule afterwards and sealing, reaction obtained hydrogel in 7 days under 75 ℃; Seasoning more than 5 hours in air then, infrared lamp oven dry (about 60 ℃ of drying position) 5 hours, put into the last drying and dewatering of baking oven (110 ℃) 5 hours subsequently, obtain organic aerogel.The density that records organic aerogel is 0.520gcm
-3, with theoretical density 0.451gcm
-3More approaching.
Embodiment 7: according to R/F=0.5, R/C=200 (C is a cetyl trimethylammonium bromide), RF%=40wt%, 1 gram Resorcinol, 1.26 milliliters of formalins, 0.0165 gram cetyl trimethylammonium bromide and 1.46 ml distilled waters are mixed and stir, pour in the ampoule afterwards and sealing, reaction obtained hydrogel in 1 day under 75 ℃; Seasoning 1 day in air then, infrared lamp are dried (about 60 ℃ of drying position) 5 hours, were put into the last drying and dewatering of baking oven (110 ℃) 5 hours subsequently, obtain organic aerogel.The density that records organic aerogel is 0.478gcm
-3, with theoretical density 0.447gcm
-3Very approaching.
Embodiment 8: according to R/F=0.5, R/C=200 (C is a cetyl trimethylammonium bromide), RF%=40wt%, 1 gram Resorcinol, 1.26 milliliters of formalins, 0.0165 gram cetyl trimethylammonium bromide and 1.46 ml distilled waters are mixed and stir, pour in the ampoule afterwards and sealing, reaction obtained hydrogel in 13 days under 75 ℃; Seasoning half a day, infrared lamp oven dry (about 60 ℃ of drying position) 5 hours in air then, put into the last drying and dewatering of baking oven (110 ℃) 5 hours subsequently, obtain organic aerogel.The density that records organic aerogel is 0.474gcm
-3, with theoretical density 0.447gcm
-3Very approaching.
Embodiment 9: according to R/F=0.5, R/C=500 (C is a cetyl trimethylammonium bromide), RF%=30wt%, 1 gram Resorcinol, 1.26 milliliters of formalins, 0.0066 gram cetyl trimethylammonium bromide and 2.73 ml distilled waters are mixed and stir, pour in the ampoule afterwards and sealing, reaction obtained hydrogel in 5 days under 85 ℃; Seasoning half a day, infrared lamp oven dry (about 60 ℃ of drying position) 5 hours in air then, put into the last drying and dewatering of baking oven (110 ℃) 5 hours subsequently, obtain organic aerogel.The density that records organic aerogel is 0.413gcm
-3, with theoretical density 0.325gcm
-3More approaching.
Embodiment 10: according to R/F=0.5, R/C=500 (C is a cetyl trimethylammonium bromide), RF%=60wt%, 1 gram Resorcinol, 1.26 milliliters of formalins, 0.0066 gram cetyl trimethylammonium bromide and 0.17 ml distilled water are mixed and stir, pour in the ampoule afterwards and sealing, reaction obtained hydrogel in 5 days under 85 ℃; Seasoning half a day, infrared lamp oven dry (about 60 ℃ of drying position) 5 hours in air then, put into the last drying and dewatering of baking oven (110 ℃) 5 hours subsequently, obtain organic aerogel.The density that records organic aerogel is 0.766gcm
-3, with theoretical density 0.708gcm
-3More approaching.
Claims (4)
1. a method for preparing charcoal-aero gel is a reaction monomers with Resorcinol and formaldehyde, and organic surface active agent is as emulsifying agent and catalyzer, and water is solvent, is heating and curing more than 1 day between 75 ℃ to 100 ℃, gets hydrogel; With this hydrogel elder generation seasoning more than 5 hours, 60 ℃ of infrared lamp oven dry 5 hours, put into 110 ℃ of last drying and dewaterings of baking oven 5 hours subsequently, perhaps directly 60 ℃ of infrared lamps oven dry 5 hours, put into 110 ℃ of last drying and dewaterings of baking oven 5 hours subsequently, organic aerogel; With the charing in inert atmosphere of this organic aerogel, carbonization temperature is more than 600 ℃, and carbonization time got required charcoal-aero gel more than 60 minutes; Used each material mixture ratio is: the mol ratio R/F of Resorcinol and formaldehyde is 0.2～1.3; The mol ratio R/C of Resorcinol and organic surface active agent is 10～2000; Reactant total concn RF% is 10～80wt%.
2. in accordance with the method for claim 1, it is characterized in that described formaldehyde is the formalin of 37～40wt%.
3. in accordance with the method for claim 1, it is characterized in that described organic surface active agent is cetyl trimethylammonium bromide, sodium laurylsulfonate or Tetrabutyl amonium bromide.
4. according to the described method of claim 1,2 or 3, it is characterized in that concrete processing step is:
(1). Resorcinol, formaldehyde, water and organic surface active agent are mixed and stir according to predetermined formulation, pour in the reaction flask afterwards and sealing, heating obtained hydrogel to 10 days in 1 day between 75 ℃ to 100 ℃;
(2). with 5 hours to 10 days, the 60 ℃ infrared lamps oven dry of seasoning 5 hours in air of the hydrogel of (1) gained, put into 110 ℃ of last drying and dewaterings of baking oven 5 hours subsequently, perhaps, obtain organic aerogel directly 60 ℃ of infrared lamps oven dry 5 hours, put into 110 ℃ of last drying and dewaterings of baking oven 5 hours subsequently;
(3). the organic aerogel of (2) gained is placed charring furnace, under protection of inert gas, heat charing, 600～1100 ℃ of carbonization temperatures, carbonization time 60～300 minutes, cooling cooling naturally obtains charcoal-aero gel afterwards.
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Cited By (1)
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| US11535521B2 (en) * | 2020-02-07 | 2022-12-27 | Lawrence Livermore National Security, Llc | Large scale synthesis of resorcinol-formaldehyde aerogel |
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| CN112358586B (en) * | 2020-11-10 | 2023-09-15 | 中钢集团马鞍山矿山研究总院股份有限公司 | Low-cost preparation method of carbon aerogel precursor |
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| US11535521B2 (en) * | 2020-02-07 | 2022-12-27 | Lawrence Livermore National Security, Llc | Large scale synthesis of resorcinol-formaldehyde aerogel |
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