CN115925386A - Low-density silicon dioxide aerogel coiled material and preparation method thereof - Google Patents
Low-density silicon dioxide aerogel coiled material and preparation method thereof Download PDFInfo
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- CN115925386A CN115925386A CN202211698555.9A CN202211698555A CN115925386A CN 115925386 A CN115925386 A CN 115925386A CN 202211698555 A CN202211698555 A CN 202211698555A CN 115925386 A CN115925386 A CN 115925386A
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- 239000000463 material Substances 0.000 title claims abstract description 64
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 239000004964 aerogel Substances 0.000 title claims abstract description 39
- 239000000377 silicon dioxide Substances 0.000 title claims abstract description 18
- 235000012239 silicon dioxide Nutrition 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000000835 fiber Substances 0.000 claims abstract description 46
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 32
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000002131 composite material Substances 0.000 claims abstract description 26
- 239000011240 wet gel Substances 0.000 claims abstract description 26
- 238000001035 drying Methods 0.000 claims abstract description 22
- 230000002787 reinforcement Effects 0.000 claims abstract description 22
- 239000003365 glass fiber Substances 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 15
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000003063 flame retardant Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000009413 insulation Methods 0.000 claims abstract description 10
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 10
- 238000009960 carding Methods 0.000 claims abstract description 9
- 239000002243 precursor Substances 0.000 claims abstract description 9
- 238000000352 supercritical drying Methods 0.000 claims abstract description 9
- 238000005096 rolling process Methods 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 6
- 238000001179 sorption measurement Methods 0.000 claims abstract description 3
- 239000004965 Silica aerogel Substances 0.000 claims description 17
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 12
- 229910052710 silicon Inorganic materials 0.000 claims description 12
- 239000010703 silicon Substances 0.000 claims description 12
- 230000003301 hydrolyzing effect Effects 0.000 claims description 10
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 8
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 7
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
- LFQCEHFDDXELDD-UHFFFAOYSA-N tetramethyl orthosilicate Chemical compound CO[Si](OC)(OC)OC LFQCEHFDDXELDD-UHFFFAOYSA-N 0.000 claims description 6
- 239000000499 gel Substances 0.000 claims description 3
- 239000004111 Potassium silicate Substances 0.000 claims description 2
- 239000001023 inorganic pigment Substances 0.000 claims description 2
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical group [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 claims description 2
- 235000019353 potassium silicate Nutrition 0.000 claims description 2
- 229910052913 potassium silicate Inorganic materials 0.000 claims description 2
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 2
- 230000000873 masking effect Effects 0.000 claims 1
- 230000002209 hydrophobic effect Effects 0.000 abstract description 4
- 230000004048 modification Effects 0.000 abstract description 4
- 238000012986 modification Methods 0.000 abstract description 4
- 230000007062 hydrolysis Effects 0.000 abstract description 2
- 238000006460 hydrolysis reaction Methods 0.000 abstract description 2
- 238000004140 cleaning Methods 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 4
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000007654 immersion Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- CPUDPFPXCZDNGI-UHFFFAOYSA-N triethoxy(methyl)silane Chemical compound CCO[Si](C)(OCC)OCC CPUDPFPXCZDNGI-UHFFFAOYSA-N 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
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Classifications
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
Abstract
The invention provides a preparation method of a low-density silicon dioxide aerogel coiled material, which comprises the following steps: s1, shredding glass fiber short fibers doped with 10-50% of flame-retardant organic fibers, opening, mixing, carding, lapping and needling to obtain a fiber reinforcement; s2, preparing silicon dioxide sol by hydrolysis with a co-precursor method; s3, adjusting the pH value of the silica sol obtained in the S2 by using an alkaline substance, performing saturated adsorption on the silica sol obtained in the S1 by using a fiber reinforcement, and rolling to obtain a wet gel composite coiled material; and S4, drying the wet gel composite coiled material obtained in the S3 by using an ethanol supercritical drying process to obtain the low-density silicon dioxide aerogel heat insulation coiled material. According to the invention, the co-precursor is added, so that the hydrophobic modification thoroughness of the aerogel is realized, the hydrophobicity of the aerogel material can be improved, and the aerogel material can better adapt to a low-temperature environment.
Description
Technical Field
The invention relates to the field of heat insulating materials, in particular to a low-density silicon dioxide aerogel coiled material and a preparation method thereof.
Background
The silica aerogel is a continuous three-dimensional network structure with ultrahigh porosity formed by the mutual polymerization of nano-scale silica particles, and the thermal conductivity, the convection heat transfer efficiency and the radiation heat transfer efficiency of the silica aerogel are effectively limited due to the special nano-scale mesopores and the special skeleton structure, so that the aerogel has very low thermal conductivity coefficient and is a solid material with the lowest thermal conductivity coefficient in the world at present. The aerogel has the defects of low strength, poor toughness, frangibility and the like, and the direct application of the aerogel is limited to a certain extent. The low-density and high-mechanical-strength fibers can reinforce the aerogel, and improve the mechanical properties of the aerogel although the heat insulation performance of the aerogel is reduced. The aerogel heat insulation product prepared by compounding the silica aerogel and the fibers is applied to the fields of industrial heat insulation and the like, wherein the silica aerogel coiled material is most widely applied.
At present, the density of the silicon dioxide aerogel coiled material is mainly 160-220kg/m 3 Meanwhile, the combustion grade can reach A grade, but the density is too high, the flexibility and the elasticity are relatively poor, the buffer resistance is lacked when the expansion and contraction change is caused by large temperature difference, and the lightweight of the heat insulation material is not facilitated.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art, provides a low-density silicon dioxide aerogel coiled material and a preparation method thereof, and aims to solve the problems of high density, and relatively poor flexibility and elasticity of the conventional aerogel coiled material.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a preparation method of a low-density silicon dioxide aerogel coiled material comprises the following steps:
s1, shredding glass fiber short fibers doped with 10-50% of flame-retardant organic fibers, opening, mixing, carding, lapping and needling to obtain a fiber reinforcement;
s2, hydrolyzing by a co-precursor method to prepare the silica sol, wherein the co-precursor is prepared by mixing a silicon source A and a silicon source B according to a molar ratio of 1;
s3, adjusting the pH value of the silica sol obtained in the S2 by using an alkaline substance, performing saturated adsorption on the silica sol obtained in the S1 by using a fiber reinforcement, and rolling to obtain a wet gel composite coiled material;
and S4, drying the wet gel composite coiled material obtained in the S3 by using an ethanol supercritical drying process to obtain the low-density silicon dioxide aerogel heat insulation coiled material.
Further, the silicon source A is any one of methyl orthosilicate and ethyl orthosilicate, and the silicon source B is potassium silicate or ethyl silicate containing at least one non-hydrolytic group.
Further, the fiber reinforcement has a density of 50-90kg/m 3 。
Further, in S3, the alkaline substance is ammonia water or liquid alkali, after the pH value of the silica sol is adjusted to 8-9, the silica sol is adsorbed by a fiber reinforcement body in a saturated way, and the gel is formed after natural standing for 10-120 min.
Further, in the drying process in S4, ethanol is used for drying, the drying pressure is 8-16MPa, and the drying temperature is 250-300 ℃.
Furthermore, the flame-retardant organic fiber also comprises inorganic pigment for modulating the shielding performance of the aerogel coiled material.
Further, the low-density silicon dioxide aerogel coiled material is prepared according to the preparation method of the low-density silicon dioxide aerogel coiled material.
Compared with the prior art, the invention has the beneficial effects that:
1) The forming density of the glass fiber punched coiled material is generally more than 100kg/m & lt 3 & gt, and a small amount of flame-retardant organic fiber is introduced into the punched coiled material, so that the structural strength of the glass fiber punched coiled material after forming can be improved, and the density of the punched coiled material can be reduced. The proper reduction of the density is beneficial to reducing the heat conductivity coefficient of the aerogel.
2) Ethanol is subjected to supercritical drying, the drying medium is the same as the medium in the pores of the gel, the preparation of the aerogel can be completed only by controlling the temperature and the pressure, and further structural reinforcement is not needed. The residue of organic matters in the finished product can be effectively reduced by utilizing the high temperature and the dissolubility of the ethanol in the supercritical state.
3) The co-precursor is added, so that the hydrophobic modification thoroughness of the aerogel is realized, the hydrophobicity of the aerogel material can be improved, and the low-temperature environment can be better adapted.
4) The shielding performance of the aerogel coiled material is adjusted by adjusting the color of the organic fiber in the mixed-carding needling coiled material; meanwhile, the aerogel product is colored to increase the identification degree, and compared with a powder adding mode, the uniformity of the method is not limited by the thickness of the fiber reinforcement.
Drawings
The disclosure of the present invention is illustrated with reference to the accompanying drawings. It is to be understood that the drawings are designed solely for the purposes of illustration and not as a definition of the limits of the invention. In the drawings, like reference numerals are used to refer to like elements throughout. Wherein:
figure 1 schematically shows low density silica insulation coil-like pieces of different colors.
Detailed Description
It is easily understood that according to the technical solution of the present invention, a person skilled in the art can propose various alternative structures and implementation ways without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical aspects of the present invention, and should not be construed as all of the present invention or as limitations or limitations on the technical aspects of the present invention.
As shown in fig. 1, a preparation method of a low-density silica aerogel material comprises the following steps:
s1, opening, mixing, carding, lapping and needling glass fiber doped with 10-50% of flame-retardant organic fiber to obtain glass fiber with the density of 50-90kg/cm 3 The mixed comb needling coiled material is a fiber reinforcement for standby.
S2, preparing the silica sol by adopting a co-precursor method through hydrolysis, wherein the co-precursor is prepared by mixing a silicon source A and a silicon source B according to a molar ratio of 1:0.1-0.5, adding 2-10 times of ethanol water solution with the concentration of 80-90%, adjusting the pH value to 4-6, and hydrolyzing to obtain the silica sol. The silicon source A is one of methyl orthosilicate and ethyl orthosilicate, and the silicon source B is methyl silicate or ethyl silicate containing at least one non-hydrolytic group.
And S3, adjusting the pH value of the silica sol obtained in the step S2 to 8-9 by using alkaline substances such as ammonia water or liquid caustic soda, quickly and saturated adsorbing the silica sol by the fiber reinforcement of the step S1, naturally standing for 10min to 2h, gelling, and rolling to obtain the wet gel composite coiled material.
And S4, transferring the wet gel composite coiled material obtained in the S3 into a supercritical drying kettle, adding ethanol to submerge the wet gel composite coiled material, sealing and heating the wet gel composite coiled material, controlling the drying pressure to be 8-16MPa and the drying temperature to be 250-300 ℃, discharging the material at the temperature not higher than 150 ℃ after drying is finished, and cleaning and rewinding the material to obtain the low-density silicon dioxide aerogel heat insulation coiled material.
The technical effects of the present application will be further described with reference to the following examples.
Example 1
Preparation of a low density silica aerogel material comprising the steps of:
s1, shredding glass fiber short fibers doped with 20% of flame-retardant polyester fibers, opening, mixing, carding, lapping and needling to obtain the glass fiber short fibers with the thickness of 10mm and the density of 80kg/m 3 The mixed comb needling coiled material is a fiber reinforcement for standby.
S2, mixing tetraethoxysilane and methyltriethoxysilane according to a molar ratio of 1.3, adding a 4-fold volume of 87% ethanol aqueous solution, adjusting the pH to 5, stirring and hydrolyzing for 2 hours to obtain the silica sol.
And S3, adjusting the pH value of the silica sol obtained in the step S2 to 8.5 by using ammonia water, quickly and saturated adsorbing the silica sol by using the fiber reinforcement in the step S1, naturally standing for 20min, then gelling, and rolling after 10min to obtain the wet gel composite coiled material.
And S4, transferring the wet gel composite material obtained in the S3 into a supercritical drying kettle, adding ethanol to submerge the wet gel composite material, heating the wet gel composite material in a sealed manner, raising the temperature, controlling the drying pressure to be 10MPa until the temperature reaches 270 ℃, keeping the temperature and the pressure constant for 4 hours, and relieving the pressure to be 0 at the pressure of 2 MPa/hour to finish drying. And cooling to 150 ℃, discharging, and cleaning and rewinding the materials to obtain the low-density silica aerogel heat-insulating coiled material.
The obtained aerogel coiled material has the thickness of 9.5mm and the density of 110kg/m 3 The heat conductivity coefficient at 25 ℃ is less than or equal to 0.017W/(m.K), the combustion grade is A grade, the hydrophobic rate is 99.4 percent, the full immersion volume water absorption rate is 0.5 percent, and the compression rebound rate is 98 percent.
Example 2
Preparation of a low density silica aerogel material comprising the steps of:
s1, shredding glass fiber short fibers doped with 50% flame-retardant PP black fibers, opening, mixing, carding, lapping and needling to obtain the glass fiber short fibers with the thickness of 10mm and the density of 60kg/m 3 The mixed comb needling coiled material is a fiber reinforcement for standby.
S2, mixing tetraethoxysilane and methyltriethoxysilane according to a molar ratio of 1.3, adding 3 times by volume of 87% ethanol aqueous solution, adjusting the pH to 5, stirring and hydrolyzing for 2 hours to obtain the silica sol.
And S3, adjusting the pH value of the silica sol obtained in the step S2 to 8.5 by using ammonia water, quickly and saturated adsorbing the silica sol by the fiber reinforcement in the step S1, naturally standing for 20min, then gelling, and rolling after 20min to obtain the wet gel composite coiled material.
And S4, transferring the wet gel composite material obtained in the S3 into a supercritical drying kettle, adding ethanol to submerge the wet gel composite material, heating the wet gel composite material in a sealed manner, raising the temperature, controlling the drying pressure to be 13MPa until the temperature reaches 270 ℃, keeping the temperature and the pressure constant for 4 hours, and relieving the pressure to be 0 at the pressure of 2 MPa/hour to finish drying. And cooling to 140 ℃ for discharging, and cleaning and rewinding the materials to obtain the low-density silicon dioxide aerogel heat insulation coiled material.
The obtained aerogel coil had a thickness of 9.6mm and a density of 86kg/m 3 The thermal conductivity coefficient at 25 ℃ is 0.016W/(m.K), the combustion grade is A grade, the hydrophobicity is 99.4%, the full immersion volume water absorption is 0.5%, and the compression rebound rate is 98%.
Example 3
Preparation of a low density silica aerogel material comprising the steps of:
s1, shredding glass fiber short fibers doped with 10% flame-retardant PP black fibers, opening, mixing, carding, lapping and needling to obtain the glass fiber short fibers with the thickness of 10mm and the density of 50kg/m 3 The mixed comb needling coiled material is a fiber reinforcement for standby.
S2, mixing methyl orthosilicate and methyltriethoxysilane according to a molar ratio of 1:0.1, adding a 2-time volume of 80% ethanol aqueous solution, adjusting the pH to 4, stirring and hydrolyzing for 2 hours to obtain the silica sol.
And S3, adjusting the pH value of the silica sol obtained in the step S2 to 8 by using ammonia water, quickly and saturated adsorbing the silica sol by the fiber reinforcement in the step S1, naturally standing for 10min, then gelling, and rolling after 20min to obtain the wet gel composite coiled material.
And S4, transferring the wet gel composite material obtained in the S3 into a supercritical drying kettle, adding ethanol to submerge the wet gel composite material, heating the wet gel composite material in a sealed manner, raising the temperature, controlling the drying pressure to be 8MPa until the temperature reaches 250 ℃, keeping the temperature and the pressure constant for 4 hours, and relieving the pressure to be 0 at the pressure of 2 MPa/hour to finish drying. And cooling to 140 ℃ for discharging, and cleaning and rewinding the materials to obtain the low-density silicon dioxide aerogel heat insulation coiled material.
The obtained aerogel coiled material has the thickness of 9.5mm and the density of 94kg/m 3 The thermal conductivity coefficient at 25 ℃ is 0.016W/(m.K), the combustion grade is A grade, the hydrophobicity is 99.7%, the full immersion volume water absorption is 0.63%, and the compression rebound rate is 96.8%.
Example 4
Preparation of a low density silica aerogel material comprising the steps of:
s1, shredding glass fiber short fibers doped with 35% of flame-retardant PP black fibers, opening, mixing, carding, lapping and needling to obtain the glass fiber short fibers with the thickness of 10mm and the density of 90kg/m 3 The mixed comb needling coiled material is a fiber reinforcement for standby.
S2, mixing methyl orthosilicate and methyltriethoxysilane according to a molar ratio of 1.5, adding a 10-time volume of 90% ethanol aqueous solution, adjusting the pH to 6, stirring and hydrolyzing for 2 hours to obtain the silica sol.
And S3, adjusting the pH value of the silica sol obtained in the step S2 to 9 by using ammonia water, quickly and saturated adsorbing the silica sol by using the fiber reinforcement in the step S1, naturally standing for 120min, then gelling, and rolling for 20min to obtain the wet gel composite coiled material.
And S4, transferring the wet gel composite material obtained in the S3 into a supercritical drying kettle, adding ethanol to submerge the wet gel composite material, heating the wet gel composite material in a sealed manner, raising the temperature, controlling the drying pressure to be 16MPa until the temperature reaches 300 ℃, keeping the temperature and the pressure constant for 4 hours, and then relieving the pressure to be 0 at the pressure of 2 MPa/hour to finish drying. And cooling to 140 ℃ for discharging, and cleaning and rewinding the materials to obtain the low-density silica aerogel heat-insulating coiled material.
The obtained aerogel coiled material has the thickness of 9.6mm and the density of 92kg/m 3 The thermal conductivity coefficient at 25 ℃ is 0.016W/(m.K), the combustion grade is A grade, the hydrophobic rate is 99.5%, the full immersion volume water absorption rate is 0.56%, and the compression rebound rate is 97.3%.
The technical scope of the present invention is not limited to the above description, and those skilled in the art can make various changes and modifications to the above-described embodiments without departing from the technical spirit of the present invention, and such changes and modifications should fall within the protective scope of the present invention.
Claims (7)
1. The preparation method of the low-density silicon dioxide aerogel coiled material is characterized by comprising the following steps of:
s1, shredding glass fiber short fibers doped with 10-50% of flame-retardant organic fibers, opening, mixing, carding, lapping and needling to obtain a fiber reinforcement;
s2, hydrolyzing by a co-precursor method to prepare the silica sol, wherein the co-precursor is prepared by mixing a silicon source A and a silicon source B according to a molar ratio of 1;
s3, adjusting the pH value of the silica sol obtained in the S2 by using an alkaline substance, performing saturated adsorption on the silica sol obtained in the S1 by using a fiber reinforcement, and rolling to obtain a wet gel composite coiled material;
and S4, drying the wet gel composite coiled material obtained in the S3 by using an ethanol supercritical drying process to obtain the low-density silicon dioxide aerogel heat insulation coiled material.
2. The method for preparing the low-density silica aerogel coil according to claim 1, wherein the silicon source A is any one of methyl orthosilicate and ethyl orthosilicate, and the silicon source B is potassium silicate or ethyl silicate containing at least one non-hydrolytic group.
3. Method for producing a low-density silica aerogel coil according to claim 1, characterized in that the fiber reinforcement density is between 50 and 90kg/m 3 。
4. The preparation method of the low-density silica aerogel coil material according to claim 1, wherein the alkaline substance in S3 is ammonia water or caustic soda, the silica sol is adsorbed by a fiber reinforcement in a saturated manner after the pH value of the silica sol is adjusted to 8-9, and the gel is formed after natural standing for 10-120 min.
5. The method for preparing a low-density silica aerogel coil according to claim 1, wherein the drying process in S4 is performed with ethanol under a drying pressure of 8 to 16MPa and at a drying temperature of 250 to 300 ℃.
6. The method of claim 1, wherein the organic flame retardant fibers further comprise inorganic pigments for modifying the masking properties of the aerogel web.
7. A low density silica aerogel coil, characterized by being produced according to the method for producing a low density silica aerogel coil of any of claims 1 to 6.
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