CN115161997A - Preparation method of multi-component aerogel composite fiber felt for bridge fire resistance - Google Patents
Preparation method of multi-component aerogel composite fiber felt for bridge fire resistance Download PDFInfo
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- CN115161997A CN115161997A CN202210901097.8A CN202210901097A CN115161997A CN 115161997 A CN115161997 A CN 115161997A CN 202210901097 A CN202210901097 A CN 202210901097A CN 115161997 A CN115161997 A CN 115161997A
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/77—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with silicon or compounds thereof
- D06M11/79—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with silicon or compounds thereof with silicon dioxide, silicic acids or their salts
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4209—Inorganic fibres
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
- D04H1/43835—Mixed fibres, e.g. at least two chemically different fibres or fibre blends
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
- D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/73—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof
- D06M11/76—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof with carbon oxides or carbonates
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2200/00—Functionality of the treatment composition and/or properties imparted to the textile material
- D06M2200/30—Flame or heat resistance, fire retardancy properties
Abstract
A preparation method of a multi-component aerogel composite fiber felt for bridge fire resistance comprises the following steps: (1) Preparing a composite fiber felt by taking mullite fibers and ceramic fibers as raw materials and adopting a needling process; (2) preparing a silica gel solution by using a chemical route; (3) Completely immersing the composite fiber felt into the silica gel solution, thereby preparing a composite fiber felt-silica gel composite; (4) Aging the composite fibrofelt-silica gel complex, and then soaking the complex in a sodium bicarbonate solution for solvent replacement; (5) And (3) cleaning the composite fiber felt-silica gel complex soaked in the sodium bicarbonate solution by using water, and then putting the composite fiber felt-silica gel complex into an oven for sectional drying treatment, thereby preparing the multi-component aerogel composite fiber felt. The multi-component aerogel composite fiber felt prepared by the preparation method disclosed by the invention has the advantages that the fire-resistant temperature of the passive fire-resistant material suitable for a steel bridge is increased, and the excellent high-temperature resistance and low thermal conductivity are shown.
Description
Technical Field
The invention belongs to the technical field of fire-resistant materials, and particularly relates to a preparation method of a multi-component aerogel composite fiber felt for bridge fire resistance.
Background
The large-span bridges built in the world are mostly suspension bridges and cable-stayed bridges of cable bearing systems. The cable mainly comprises high-strength steel wires, the strength of the high-strength steel wires is reduced violently along with the temperature rise, and when the temperature exceeds 700 ℃, the steel wires basically lose the bearing capacity. Along with the rapid development of the economy of China in the year, the bridge traffic volume, particularly the traffic volume of dangerous chemical vehicles, is obviously increased, so that a large number of bridge fire accidents are caused. Taking an oil tank truck as an example, the maximum heat release rate can reach 200MW when a fire disaster occurs, the temperature exceeds 1100 ℃, and the fire disaster can cause irreversible damage to a bridge cable system under the condition of no protective measures, even cause the collapse of a bridge, and cause major safety accidents and economic damage. Therefore, the fire safety problem of the bridge is more and more emphasized. However, at present, a refractory material for a special use environment of a bridge is lacked. The bridge refractory material is required to have good fire resistance and heat insulation performance at 1100 ℃, good mechanical property and low thermal conductivity coefficient, and can adapt to dynamic load of a bridge in operation.
The currently used refractory fiber material is not optimized for the use scene of a bridge cable system, and the mechanical property and the high-temperature use performance are not well matched. The composite of multiple refractory fibers can obtain better comprehensive performance, and realize effective regulation and control of specific performance indexes. The prior composite refractory fiber product still has the defects of high heat conductivity coefficient, poor binding capacity and the like. The silicon dioxide aerogel is a material with a porous structure, the porosity can reach more than 90%, and the silicon dioxide aerogel has an extremely low heat conductivity coefficient. Compounding the silica aerogel with the refractory fiber can effectively reduce the heat conductivity coefficient of the refractory fiber. The invention compounds mullite fiber with excellent high-temperature performance and ceramic fiber with better flexibility to prepare the composite fiber felt, and then compounds the silicon dioxide aerogel and the composite fiber felt to develop the multi-component aerogel composite fiber felt.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a preparation method of a multi-component aerogel composite fiber felt for bridge fire resistance, which can improve the fire resistance temperature of a passive fire-resistant material suitable for a steel bridge and simultaneously clarify the influence of the ratio of mullite fiber and ceramic fiber on the thermal conductivity and the high-temperature fire resistance of the composite fiber aerogel felt.
In order to realize the purpose, the invention adopts the technical scheme that:
a preparation method of a multi-component aerogel composite fiber felt for bridge fire resistance comprises the following steps:
(1) The mullite fiber and ceramic fiber composite fiber felt with the thickness of 10mm is prepared by taking the mullite fiber and the ceramic fiber as raw materials and adopting a needling process: opening and mixing mullite fibers and ceramic fibers by using an opener, preparing a composite fiber felt after needling compaction, and shearing the composite fiber felt for subsequent use;
(2) Mixing orthosilicate, ethanol and water according to a molar ratio of 1; subsequently, adding dimethylformamide and water dropwise, wherein the molar ratio of the dimethylformamide to the orthosilicate is 0.2; then dropwise adding an ammonia water solution and an ammonium fluoride solution under stirring, stopping dropwise adding the ammonia water solution when the pH value of the solution is more than 6, and controlling the molar ratio of the added ammonium fluoride to the orthosilicate to be 0.008;
(3) Completely immersing the sheared composite fiber felt into the silica gel solution for 1-2 hours to prepare a composite fiber felt-silica gel composite;
(4) Aging the composite fiber felt-silica gel complex in a drying oven at 40 ℃ for 24 hours, and then soaking the composite fiber felt-silica gel complex in sodium bicarbonate solution with certain concentration for solvent replacement, wherein the soaking time is 24 hours;
(5) And (3) cleaning the composite fibrofelt-silicon dioxide gel complex soaked in the sodium bicarbonate solution by using water, putting the complex into an oven for sectional drying, drying the complex at 60 ℃ for 8 hours, and drying the complex at 150 ℃ for 1 hour to obtain the multi-component aerogel composite fibrofelt.
Preferably, in the step (1), the mass ratio of the mullite fiber to the ceramic fiber is 5, 6.
Preferably, in step (1), before the needle punching compaction, in order to improve the tensile strength of the composite fiber felt, a ceramic fiber cloth with the thickness of 0.5mm is placed in the middle of the composite fiber felt.
Preferably, the shearing specification of the composite fiber mat in the step (1) is 300mm × 300mm × 10mm.
Preferably, in the step (3), the silica gel solution for immersing the composite fiber felt is subjected to ultrasonic dispersion treatment during immersion, the ultrasonic power is 240W, and the ultrasonic time is consistent with the immersion time.
Preferably, in the step (4), the concentration of the sodium bicarbonate solution is 0.2-0.4 mol/L.
The invention has the following advantages: the mullite fiber with excellent high-temperature fire resistance and the ceramic fiber with good flexibility are compounded to prepare the composite fiber felt through a traditional needling process, then the silica gel is compounded with the composite fiber felt through a chemical route to prepare the multi-component aerogel composite fiber felt, the thermal conductivity, the room-temperature tensile property and the high-temperature resistance of the multi-component aerogel composite fiber felt are tested, and the result shows that the multi-component aerogel composite fiber felt has excellent high-temperature resistance and low thermal conductivity.
Drawings
FIG. 1 is a room temperature tensile curve of a multicomponent aerogel composite fiber mat.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1:
a preparation method of a multi-component aerogel composite fiber felt for bridge fire resistance comprises the following steps:
(1) The mullite fiber and ceramic fiber composite fiber felt with the thickness of 10mm is prepared by taking the mullite fiber and the ceramic fiber as raw materials and adopting the traditional needling process, and the mullite fiber and the ceramic fiber with the mass ratio of 5:5 are subjected to opening and mixing treatment by utilizing an opener. In order to improve the tensile strength of the composite fiber felt, before needling and compacting, ceramic fiber cloth with the thickness of 0.5mm is placed in the middle of the composite fiber felt, and the composite fiber felt is cut into pieces with the length and width of 300mm for subsequent use.
(2) Mixing orthosilicate, ethanol and water according to a molar ratio of 1. Subsequently, dimethylformamide (DMF) and water were added dropwise, the molar ratio of DMF to orthosilicate being 0.2. Subsequently, an aqueous ammonia solution and an ammonium fluoride solution were added dropwise under stirring, and the addition of the aqueous ammonia solution was stopped when the PH of the solution was more than 6, and the molar ratio of ammonium fluoride to orthosilicate was 0.008.
(3) And completely immersing the composite fiber felt of 300mm multiplied by 10mm into the silicon dioxide gel solution for 1 h-2 h, wherein the silicon dioxide gel solution in which the composite fiber felt is immersed is subjected to ultrasonic dispersion treatment with the ultrasonic power of 240W, and the ultrasonic time is consistent with the immersion time, so that the composite fiber felt-silicon dioxide gel composite is prepared.
(4) And (3) aging the composite fiber felt-silica gel composite in a 40 ℃ oven for 24h, and then soaking the composite fiber felt-silica gel composite in a sodium bicarbonate solution with the concentration of 0.3mol/L for solvent replacement, wherein the soaking time is 24h.
(5) And (3) cleaning the composite fibrofelt-silicon dioxide gel complex soaked in the sodium bicarbonate solution by using water, putting the complex into an oven for sectional drying, drying the complex at 60 ℃ for 8 hours, and drying the complex at 150 ℃ for 1 hour to obtain the multi-component aerogel composite fibrofelt.
Through determination, the thermal conductivity coefficient of the obtained multi-component aerogel composite fiber felt at 25 ℃ is 0.019W/(m.K), which is far lower than that of similar products in the market.
Example 2:
a preparation method of a multi-component aerogel composite fiber felt for bridge fire resistance comprises the following steps:
(1) The mullite fiber and ceramic fiber composite fiber felt with the thickness of 10mm is prepared by taking the mullite fiber and the ceramic fiber as raw materials and adopting the traditional needling process, and the mullite fiber and the ceramic fiber with the mass ratio of 6:4 are subjected to opening and mixing treatment by utilizing an opener. In order to improve the tensile strength of the composite fiber felt, before needling compaction, ceramic fiber cloth with the thickness of 0.5mm is placed in the middle of the composite fiber felt, and the composite fiber felt is cut into pieces with the length and width of 300mm for subsequent use.
(2) Mixing orthosilicate, ethanol and water according to a molar ratio of 1. Subsequently, dimethylformamide (DMF) and water were added dropwise, the molar ratio of DMF to orthosilicate being 0.2. Subsequently, an aqueous ammonia solution and an ammonium fluoride solution were added dropwise under stirring, and the addition of the aqueous ammonia solution was stopped when the PH of the solution was more than 6, and the molar ratio of ammonium fluoride to orthosilicate was 0.008.
(3) And completely immersing the composite fiber felt of 300mm multiplied by 10mm into the silicon dioxide gel solution for 1 h-2 h, wherein the silicon dioxide gel solution in which the composite fiber felt is immersed is subjected to ultrasonic dispersion treatment with the ultrasonic power of 240W, and the ultrasonic time is consistent with the immersion time, so that the composite fiber felt-silicon dioxide gel composite is prepared.
(4) And (3) aging the composite fiber felt-silica gel composite in a 40 ℃ oven for 24h, and then soaking the composite fiber felt-silica gel composite in a sodium bicarbonate solution with the concentration of 0.3mol/L for solvent replacement, wherein the soaking time is 24h.
(5) And (3) cleaning the composite fibrofelt-silicon dioxide gel complex soaked in the sodium bicarbonate solution by using water, putting the complex into an oven for sectional drying, drying the complex at 60 ℃ for 8 hours, and drying the complex at 150 ℃ for 1 hour to obtain the multi-component aerogel composite fibrofelt.
Through determination, the thermal conductivity coefficient of the obtained multi-component aerogel composite fiber felt at 25 ℃ is 0.020W/(m.K), which is far lower than that of similar products in the market.
Example 3:
a preparation method of a multi-component aerogel composite fiber felt for bridge fire resistance comprises the following steps:
(1) The mullite fiber and ceramic fiber composite fiber felt with the thickness of 10mm is prepared by taking the mullite fiber and the ceramic fiber as raw materials and adopting the traditional needling process, and the mullite fiber and the ceramic fiber with the mass ratio of 7:3 are subjected to opening and mixing treatment by utilizing an opener. In order to improve the tensile strength of the composite fiber felt, before needling compaction, ceramic fiber cloth with the thickness of 0.5mm is placed in the middle of the composite fiber felt, and the composite fiber felt is cut into pieces with the length and width of 300mm for subsequent use.
(2) Mixing orthosilicate, ethanol and water according to a molar ratio of 1. Subsequently, dimethylformamide (DMF) and water were added dropwise, the molar ratio of DMF to orthosilicate being 0.2. Subsequently, an aqueous ammonia solution and an ammonium fluoride solution were added dropwise under stirring, and the addition of the aqueous ammonia solution was stopped when the PH of the solution was more than 6, and the molar ratio of ammonium fluoride to orthosilicate was 0.008.
(3) And completely immersing the composite fibrofelt with the size of 300mm multiplied by 10mm into the silicon dioxide gel solution for 1 h-2 h, wherein the silicon dioxide gel solution in which the composite fibrofelt is immersed is subjected to ultrasonic dispersion treatment with the ultrasonic power of 240W, and the ultrasonic time is consistent with the immersion time, so that the composite fibrofelt-silicon dioxide gel composite is prepared.
(4) And (3) aging the composite fiber felt-silica gel composite in a 40 ℃ oven for 24h, and then soaking the composite fiber felt-silica gel composite in a sodium bicarbonate solution with the concentration of 0.3mol/L for solvent replacement, wherein the soaking time is 24h.
(5) And (3) cleaning the composite fibrofelt-silicon dioxide gel complex soaked in the sodium bicarbonate solution by using water, putting the complex into an oven for sectional drying, drying the complex at 60 ℃ for 8 hours, and drying the complex at 150 ℃ for 1 hour to obtain the multi-component aerogel composite fibrofelt.
The multi-component aerogel composite fiber felt obtained by the method has the thermal conductivity coefficient of 0.020W/(m.K) at 25 ℃, which is far lower than that of like products in the market.
The multi-component aerogel composite fiber felt prepared in the prior art is subjected to room temperature stretching and high temperature treatment, the temperature is kept at 1000 ℃ for 2 hours, and then the room temperature thermal conductivity is tested, as shown in table 1. After the high-temperature annealing, the thermal conductivity of the aerogel composite fiber felt is increased in different degrees, and the thermal conductivity of the aerogel composite fiber felt is in a decreasing trend along with the increase of the content of the mullite fiber, which indicates that the content of the mullite fiber is increased, and the high-temperature fire resistance of the aerogel composite fiber felt is improved. From table 2, it can be seen that the content of mullite fiber has a weak effect on the room temperature tensile strength of the aerogel composite fiber blanket.
TABLE 1 Room temperature thermal conductivity of multicomponent aerogel composite fiber mats after high temperature treatment
| Ratio of | 5:5 | 6:4 | 7:3 |
| Thermal conductivity (W/m. K) | 0.033 | 0.032 | 0.028 |
TABLE 2 tensile Strength at Room temperature for multicomponent aerogel composite fiber mats
| Ratio of | 5:5 | 6:4 | 7:3 |
| Tensile Strength (N/25 mm) | 288 | 284 | 279 |
Fig. 1 is a room temperature tensile curve of a multicomponent aerogel composite fiber mat.
While the invention has been shown and described with reference primarily to certain embodiments thereof, it will be understood by those skilled in the art that various changes in construction and details may be made therein without departing from the scope of the invention encompassed by the appended claims. The scope of the invention is, therefore, indicated by the appended claims, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (6)
1. The preparation method of the multi-component aerogel composite fiber felt for bridge fire resistance is characterized by comprising the following steps:
(1) The mullite fiber and ceramic fiber composite fiber felt with the thickness of 10mm is prepared by taking the mullite fiber and the ceramic fiber as raw materials and adopting a needling process: opening and mixing mullite fibers and ceramic fibers by using an opener, preparing a composite fiber felt after needling compaction, and shearing the composite fiber felt for subsequent use;
(2) Mixing orthosilicate, ethanol and water according to a molar ratio of 1; subsequently, adding dimethylformamide and water dropwise, wherein the molar ratio of the dimethylformamide to the orthosilicate is 0.2; then dropwise adding an ammonia water solution and an ammonium fluoride solution under stirring, stopping dropwise adding the ammonia water solution when the pH value of the solution is more than 6, and controlling the molar ratio of the added ammonium fluoride to the orthosilicate to be 0.008;
(3) Completely immersing the sheared composite fiber felt into the silica gel solution for 1-2 hours to prepare a composite fiber felt-silica gel composite;
(4) Aging the composite fiber felt-silica gel complex in a drying oven at 40 ℃ for 24 hours, and then soaking the composite fiber felt-silica gel complex in sodium bicarbonate solution with certain concentration for solvent replacement, wherein the soaking time is 24 hours;
(5) And (3) cleaning the composite fibrofelt-silicon dioxide gel complex soaked in the sodium bicarbonate solution by using water, putting the complex into an oven for sectional drying, drying the complex at 60 ℃ for 8 hours, and drying the complex at 150 ℃ for 1 hour to obtain the multi-component aerogel composite fibrofelt.
2. The preparation method of the multi-component aerogel composite fiber mat for bridge fire resistance according to claim 1, wherein in the step (1), the mass ratio of the mullite fibers to the ceramic fibers is 5,6 and 7:3.
3. The method for preparing the multi-component aerogel composite fiber mat for bridge fire resistance according to claim 1, wherein in the step (1), in order to improve the tensile strength of the composite fiber mat before the needle punching compaction, a 0.5mm thick ceramic fiber cloth is placed in the middle of the composite fiber mat.
4. The method for preparing the multi-component aerogel composite fiber mat for bridge fire resistance according to claim 1, wherein the shear specification of the composite fiber mat in the step (1) is 300mm x 10mm.
5. The preparation method of the multi-component aerogel composite fiber mat for fire resistance of bridges according to claim 1, wherein in the step (3), the silica gel solution in which the composite fiber mat is immersed is subjected to ultrasonic dispersion treatment in an immersion process, the ultrasonic power is 240W, and the ultrasonic time is consistent with the immersion time.
6. The preparation method of the multi-component aerogel composite fiber mat for bridge fire resistance according to claim 1, wherein the concentration of the sodium bicarbonate solution in the step (4) is 0.2-0.4 mol/L.
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