CN114956775A - Preparation method of silicon dioxide aerogel - Google Patents
Preparation method of silicon dioxide aerogel Download PDFInfo
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- CN114956775A CN114956775A CN202210532253.8A CN202210532253A CN114956775A CN 114956775 A CN114956775 A CN 114956775A CN 202210532253 A CN202210532253 A CN 202210532253A CN 114956775 A CN114956775 A CN 114956775A
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 239000004964 aerogel Substances 0.000 title claims abstract description 30
- 235000012239 silicon dioxide Nutrition 0.000 title claims abstract description 21
- 239000000377 silicon dioxide Substances 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 61
- 239000000463 material Substances 0.000 claims abstract description 55
- 238000005406 washing Methods 0.000 claims abstract description 47
- 238000012986 modification Methods 0.000 claims abstract description 36
- 230000004048 modification Effects 0.000 claims abstract description 36
- 230000032683 aging Effects 0.000 claims abstract description 33
- 239000004965 Silica aerogel Substances 0.000 claims abstract description 15
- 239000011248 coating agent Substances 0.000 claims abstract description 15
- 238000000576 coating method Methods 0.000 claims abstract description 15
- 238000001035 drying Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 13
- 229910000077 silane Inorganic materials 0.000 claims description 30
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 26
- 239000003607 modifier Substances 0.000 claims description 22
- 239000000835 fiber Substances 0.000 claims description 15
- 239000011347 resin Substances 0.000 claims description 15
- 229920005989 resin Polymers 0.000 claims description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 238000007599 discharging Methods 0.000 claims description 14
- -1 polypropylene Polymers 0.000 claims description 10
- 238000007605 air drying Methods 0.000 claims description 9
- 238000007602 hot air drying Methods 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 7
- 238000013329 compounding Methods 0.000 claims description 7
- 230000002431 foraging effect Effects 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 235000019353 potassium silicate Nutrition 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 7
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000004593 Epoxy Substances 0.000 claims description 4
- 229920002748 Basalt fiber Polymers 0.000 claims description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 3
- 239000004800 polyvinyl chloride Substances 0.000 claims description 3
- SCPYDCQAZCOKTP-UHFFFAOYSA-N silanol Chemical compound [SiH3]O SCPYDCQAZCOKTP-UHFFFAOYSA-N 0.000 claims description 3
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 2
- 239000004743 Polypropylene Substances 0.000 claims description 2
- 239000004917 carbon fiber Substances 0.000 claims description 2
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 2
- 229920005610 lignin Polymers 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 2
- 238000006467 substitution reaction Methods 0.000 claims 2
- 239000000758 substrate Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 13
- 230000008569 process Effects 0.000 abstract description 4
- 239000011810 insulating material Substances 0.000 abstract description 3
- 230000000704 physical effect Effects 0.000 abstract description 3
- 239000000499 gel Substances 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 238000011010 flushing procedure Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000011240 wet gel Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000003495 polar organic solvent Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000000935 solvent evaporation Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B30/00—Compositions for artificial stone, not containing binders
- C04B30/02—Compositions for artificial stone, not containing binders containing fibrous materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B80/00—Architectural or constructional elements improving the thermal performance of buildings
- Y02B80/10—Insulation, e.g. vacuum or aerogel insulation
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Silicon Compounds (AREA)
Abstract
The invention discloses a preparation method of silicon dioxide aerogel, which specifically comprises the following steps: coating, aging, alcohol washing, modification and drying, compared with the prior art, the invention has the following advantages: firstly, the alcohol washing, the modification and the drying of the silicon dioxide aerogel prepared by the preparation process are all carried out in one treatment kettle, so that the production period can be effectively shortened, the personnel allocation can be saved, the production cost is reduced, and the yield of coiled materials is improved; secondly, the silica aerogel prepared by the process of the present invention has excellent physical properties, particularly low thermal conductivity and excellent mechanical toughness, and thus can be used in various industrial fields, for example, heat insulating materials or non-flammable materials.
Description
Technical Field
The invention relates to the technical field of aerogels, and particularly relates to a preparation method of a silicon dioxide aerogel.
Background
Aerogel is a solid material with excellent heat insulation performance, has special microstructures such as high specific surface area, nanometer-scale holes and low density, and shows excellent performance in the aspect of heat based on the structures. SiO 2 2 The aerogel is made of SiO 2 Mesoporous amorphous material with nano porous network structure formed by aggregation of colloidal particles with clusters and extremely high specific surface area>800m 3 (g), low density: (<100kg/m 3 ) And extremely high porosity (above 80%). The aerogel has a nanometer pore size, extremely low density and thermal conductivity at normal temperature, and more excellent thermal insulation performance than other thermal insulation materials, so the aerogel becomes a super thermal insulation material with the most development potential, and has wide application in the fields of aerospace, energy, chemical industry, buildings and the like.
The invention discloses a manufacturing method of a gel sheet by American skar aerogel company invention patent application number 200910151474.5. The invention has the defects of uneven and thorough gum dipping and difficult taking out, and has slower production rate and higher industrialized cost. Chinese utility model patent application No. 201621305593.3 provides an aerogel preparation system, and what this novel adoption was the mode of production is transported to the material substep, and ageing, mellow wine are washed, modified drying relates to three sets of equipment altogether promptly, the equipment cost and the cost of maintenance that increase undoubtedly, simultaneously because intelligent lower, the cost of labor drops into also correspondingly great.
Disclosure of Invention
The invention aims to provide a preparation method of silicon dioxide aerogel, which can effectively shorten the production period, save the personnel allocation, reduce the production cost and improve the yield of coiled materials by carrying out alcohol washing, modification and drying in a treatment kettle.
In order to solve the above problems, the present invention provides a method for preparing a silica aerogel, which specifically comprises the following steps:
s1, coating: mixing water glass and acid, pumping into a coating machine, and compounding on a base material to obtain a coiled material;
s2, aging: hoisting the coiled material obtained in the step S1 to an aging kettle for aging;
s3, alcohol washing: transferring the aged coiled material to a treatment kettle for alcohol washing, and discharging alcohol washing liquid from the treatment kettle after the alcohol washing is finished;
s4, modification: adding a silane modifier into the treatment kettle to modify the coiled material subjected to alcohol washing in the kettle, and discharging the residual silane modifier from the treatment kettle after modification is finished;
s5, drying: and sequentially introducing hot air and cold air into the treatment kettle, and performing hot air drying and cold air drying on the modified coiled material in the kettle to obtain the silicon dioxide aerogel.
Preferably, in step S1, the base material is one or more of glass fiber mat, basalt fiber mat, alumina fiber mat, carbon fiber mat, silicon carbide fiber mat, lignin fiber mat, polypropylene fiber mat, polyvinyl alcohol fiber mat, and polyvinyl chloride fiber mat.
Preferably, in the step S2, the aging temperature is 40-90 ℃, and the aging time is 2-8 h. The aging process is a process of maintaining the gel material at an appropriate temperature so that chemical changes completely occur, and the aging process of the gel material can reinforce the network structure inside the aerogel. Further, moisture inside the gel may be replaced with the polar organic solvent during the aging process, and thus, deformation or reduction of the porous structure of the gel due to evaporation of moisture inside the gel during the subsequent drying process may be prevented.
Preferably, in step S3, after the aged coil is placed in the treatment kettle, nitrogen gas is replaced in the treatment kettle before alcohol washing, the number of replacements is 8-10, and the pressure of each replacement is 45-50 KPa. In the invention, the purpose of nitrogen replacement is mainly to replace oxygen in the air pipe and the tank by inert gas.
Preferably, in the step S3, the alcohol washing solution is ethanol at 60-80 ℃, and the aged coil is washed with hot water at 60-70 ℃ before the alcohol washing.
Preferably, in step S4, the silane modifier is one or two of epoxy silane resin, silanol resin, aminoalkyl siloxane resin and hydroxyalkyl silane resin. The aerogel is modified by the silane modifier containing the rigid structure, so that the rigidity of the wet gel three-dimensional network structure is improved, the wet gel is effectively prevented from shrinking and collapsing due to the action of capillary force during solvent evaporation when being dried under normal pressure, the equipment investment is saved, the production efficiency is improved, the production cost is reduced, and the method is suitable for large-scale production.
Preferably, in the step S4, the modification temperature is 20-80 ℃, and the modification time is 1-8 h.
Preferably, in the step S5, the hot air drying temperature is 80-150 ℃, the time is 2-8h, and the cold air drying time is 15-30 min.
Compared with the prior art, the invention has the following advantages: firstly, the alcohol washing, the modification and the drying of the silicon dioxide aerogel prepared by the preparation process are all carried out in one treatment kettle, so that the production period can be effectively shortened, the personnel allocation can be saved, the production cost is reduced, and the yield of coiled materials is improved; secondly, the silica aerogel prepared by the process of the present invention has excellent physical properties, particularly low thermal conductivity and excellent mechanical toughness, and thus can be used in various industrial fields, for example, heat insulating materials or non-flammable materials.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments thereof are described in detail below.
Example 1
A silicon dioxide aerogel is prepared by the following steps:
s1, coating: mixing water glass and acid, pumping into a coating machine, and compounding on a glass fiber felt to obtain a coiled material;
s2, aging: hoisting the coiled material obtained in the step S1 to an aging kettle for aging, wherein the aging temperature is 60 ℃, and the aging time is 2 hours;
s3, alcohol washing: transferring the aged coiled material to a treatment kettle, firstly performing nitrogen replacement on the treatment kettle for 8 times, wherein the pressure of each replacement is 45KPa, flushing the coiled material with hot water at 60 ℃ after the replacement is finished, then performing alcohol washing with ethanol at 60 ℃ for 3 hours, and discharging the alcohol washing liquid from the treatment kettle after the alcohol washing is finished;
s4, modification: adding a silane modifier into the treatment kettle to modify the coiled material subjected to alcohol washing in the kettle, wherein the modification temperature is 60 ℃, the modification time is 1h, and after the modification is finished, discharging the residual silane modifier from the treatment kettle, wherein the silane modifier is aminoalkyl siloxane resin;
s5, drying: and sequentially introducing hot air and cold air into the treatment kettle, and performing hot air drying for 2 hours and cold air drying for 15 minutes on the modified coiled material in the kettle to obtain the silicon dioxide aerogel.
Example 2
A silicon dioxide aerogel is prepared by the following steps:
s1, coating: mixing water glass and acid, pumping into a coating machine, and compounding on a basalt fiber felt to obtain a coiled material;
s2, aging: hoisting the coiled material obtained in the step S1 to an aging kettle for aging, wherein the aging temperature is 62 ℃, and the aging time is 2.5 hours;
s3, alcohol washing: transferring the aged coiled material to a treatment kettle, firstly performing nitrogen replacement on the treatment kettle for 8 times, wherein the pressure of each replacement is 46KPa, flushing the coiled material with hot water at 62 ℃ after the replacement is finished, then performing alcohol washing with ethanol at 60 ℃ for 4 hours, and discharging the alcohol washing liquid from the treatment kettle after the alcohol washing is finished;
s4, modification: adding a silane modifier into a treatment kettle to modify the coiled material subjected to alcohol washing in the kettle, wherein the modification temperature is 62 ℃, the modification time is 3h, and after the modification is finished, discharging the residual silane modifier from the treatment kettle, wherein the silane modifier is epoxy silane resin and silanol resin;
s5, drying: and sequentially introducing hot air and cold air into the treatment kettle, and performing hot air drying for 4 hours and cold air drying for 18 minutes on the modified coiled material in the kettle to obtain the silicon dioxide aerogel.
Example 3
A silicon dioxide aerogel is prepared by the following steps:
s1, coating: mixing water glass and acid, pumping into a coating machine, and compounding on an alumina fiber felt to obtain a coiled material;
s2, aging: hoisting the coiled material obtained in the step S1 to an aging kettle for aging, wherein the aging temperature is 65 ℃, and the aging time is 3 hours;
s3, alcohol washing: transferring the aged coiled material to a treatment kettle, firstly performing nitrogen replacement on the treatment kettle for 9 times, wherein the pressure of each replacement is 47KPa, flushing the coiled material with 65 ℃ hot water after the replacement is finished, then performing alcohol washing with 75 ℃ ethanol for 6 hours, and discharging the alcohol washing liquid from the treatment kettle after the alcohol washing is finished;
s4, modification: adding a silane modifier into the treatment kettle to modify the coiled material subjected to alcohol washing in the kettle, wherein the modification temperature is 65 ℃, the modification time is 4h, and after the modification is finished, discharging the residual silane modifier from the treatment kettle, wherein the silane modifier is epoxy silane resin;
s5, drying: and sequentially introducing hot air and cold air into the treatment kettle, and performing hot air drying for 6 hours and cold air drying for 22 minutes on the modified coiled material in the kettle to obtain the silicon dioxide aerogel.
Example 4
A silicon dioxide aerogel is prepared by the following steps:
s1, coating: mixing water glass and acid, pumping into a coating machine, and compounding on a polyvinyl alcohol fiber felt to obtain a coiled material;
s2, aging: hoisting the coiled material obtained in the step S1 to an aging kettle for aging, wherein the aging temperature is 68 ℃, and the aging time is 3.5 hours;
s3, alcohol washing: transferring the aged coiled material to a treatment kettle, firstly performing nitrogen replacement on the treatment kettle for 10 times, wherein the pressure of each replacement is 49KPa, flushing the coiled material with hot water at 68 ℃ after the replacement is finished, then performing alcohol washing with ethanol at 65 ℃ for 8 hours, and discharging the alcohol washing liquid from the treatment kettle after the alcohol washing is finished;
s4, modification: adding a silane modifier into the treatment kettle to modify the coiled material subjected to alcohol washing in the kettle, wherein the modification temperature is 68 ℃, the modification time is 7 hours, and after the modification is finished, discharging the residual silane modifier from the treatment kettle, wherein the silane modifier is any one or two of hydroxyalkyl silane resins;
s5, drying: and sequentially introducing hot air and cold air into the treatment kettle, and performing hot air drying for 7 hours and cold air drying for 25 minutes on the modified coiled material in the kettle to obtain the silicon dioxide aerogel.
Example 5
A silicon dioxide aerogel is prepared by the following steps:
s1, coating: mixing water glass and acid, pumping into a coating machine, and compounding on a polyvinyl chloride fiber felt to obtain a coiled material;
s2, aging: hoisting the coiled material obtained in the step S1 to an aging kettle for aging, wherein the aging temperature is 70 ℃, and the aging time is 4 hours;
s3, alcohol washing: transferring the aged coiled material to a treatment kettle, firstly performing nitrogen replacement on the treatment kettle for 10 times, wherein the pressure of each replacement is 50KPa, flushing the coiled material with hot water at 70 ℃ after the replacement is finished, then performing alcohol washing with ethanol at 78 ℃ for 5 hours, and discharging the alcohol washing liquid from the treatment kettle after the alcohol washing is finished;
s4, modification: adding a silane modifier into a treatment kettle to modify the coiled material subjected to alcohol washing in the kettle, wherein the modification temperature is 70 ℃, the modification time is 8 hours, and after the modification is finished, discharging the residual silane modifier from the treatment kettle, wherein the silane modifier is aminoalkyl siloxane resin and hydroxyalkyl silane resin;
s5, drying: and sequentially introducing hot air and cold air into the treatment kettle, and performing hot air drying for 8 hours and cold air drying for 30 minutes on the modified coiled material in the kettle to obtain the silicon dioxide aerogel.
Comparative example 1
The preparation method of the silica aerogel is different from that of the silica aerogel in the embodiment 3 only in that after the alcohol washing, the coiled material is lifted and transferred to another kettle for modification and drying, and other steps are the same as those in the embodiment 3 and are not repeated.
The silica aerogels obtained in examples 1 to 5 and comparative example 1 were subjected to performance tests, and the test results are shown in table 1:
table 1: results of measuring Properties of silica aerogels obtained in examples 1 to 5 and comparative example 1
In the embodiments, the silicon dioxide aerogel prepared by the preparation process disclosed by the invention is subjected to alcohol washing, modification and drying in one treatment kettle, so that the production period can be effectively shortened, the personnel allocation can be saved, the production cost can be reduced, and the yield of coiled materials can be improved; meanwhile, the silica aerogel prepared by the process of the present invention has excellent physical properties, particularly low thermal conductivity and excellent mechanical toughness, and thus can be used in various industrial fields, for example, heat insulating materials or non-flammable materials.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and such changes and modifications will fall within the scope of the present invention.
Claims (8)
1. The preparation method of the silicon dioxide aerogel is characterized by comprising the following steps:
s1, coating: mixing water glass and acid, pumping into a coating machine, and compounding on a base material to obtain a coiled material;
s2, aging: hoisting the coiled material obtained in the step S1 to an aging kettle for aging;
s3, alcohol washing: transferring the aged coiled material to a treatment kettle for alcohol washing, and discharging alcohol washing liquid from the treatment kettle after the alcohol washing is finished;
s4, modification: adding a silane modifier into the treatment kettle to modify the coiled material subjected to alcohol washing in the kettle, and discharging the residual silane modifier from the treatment kettle after modification is finished;
s5, drying: and sequentially introducing hot air and cold air into the treatment kettle, and performing hot air drying and cold air drying on the modified coiled material in the kettle to obtain the silicon dioxide aerogel.
2. The method for preparing silica aerogel according to claim 1, wherein in step S1, the substrate is one or more selected from glass fiber mat, basalt fiber mat, alumina fiber mat, carbon fiber mat, silicon carbide fiber mat, lignin fiber mat, polypropylene fiber mat, polyvinyl alcohol fiber mat, and polyvinyl chloride fiber mat.
3. The method for preparing silica aerogel according to claim 1, wherein the aging temperature is 40 to 90 ℃ and the aging time is 2 to 8 hours in step S2.
4. The method for preparing silica aerogel according to claim 1, wherein in step S3, after the aged web is placed in a treatment kettle, nitrogen gas is substituted in the treatment kettle before alcohol washing, the substitution frequency is 8 to 10 times, and the pressure for each substitution is 45 to 50 KPa.
5. The method for preparing silica aerogel according to claim 1, wherein the alcohol washing solution in step S3 is ethanol at 60-80 ℃, and the aged web is washed with hot water at 60-70 ℃ before the alcohol washing.
6. The method for preparing silica aerogel according to claim 1, wherein in step S4, the silane modifier is any one or two of epoxy silane resin, silanol resin, aminoalkyl siloxane resin and hydroxyalkyl silane resin.
7. The method for preparing silica aerogel according to claim 1, wherein in step S4, the temperature of modification is 20 to 80 ℃ and the time of modification is 1 to 8 hours.
8. The method for preparing silica aerogel according to claim 1, wherein in the step S5, the temperature of hot air drying is 80-150 ℃, the time is 2-8h, and the time of cold air drying is 15-30 min.
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| CN110745834A (en) * | 2019-11-27 | 2020-02-04 | 鑫创新材料科技(徐州)有限公司 | Green production process and application of aerogel |
| CN110770168A (en) * | 2017-08-24 | 2020-02-07 | 株式会社Lg化学 | Method of manufacturing silica aerogel blanket and apparatus for manufacturing the same |
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- 2022-05-09 CN CN202210532253.8A patent/CN114956775A/en active Pending
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| US20190010060A1 (en) * | 2016-10-12 | 2019-01-10 | Lg Chem, Ltd. | Aerogel blanket for ultra-high temperature, production method thereof, and construction method thereof |
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Application publication date: 20220830 |