CN114989647A - High-bonding-strength water-based inorganic aerogel thermal insulation coating and preparation method thereof - Google Patents
High-bonding-strength water-based inorganic aerogel thermal insulation coating and preparation method thereof Download PDFInfo
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- 238000000576 coating method Methods 0.000 title claims abstract description 72
- 239000004964 aerogel Substances 0.000 title claims abstract description 71
- 239000011248 coating agent Substances 0.000 title claims abstract description 60
- 238000009413 insulation Methods 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 39
- 239000000839 emulsion Substances 0.000 claims abstract description 117
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 111
- 239000004111 Potassium silicate Substances 0.000 claims abstract description 108
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 claims abstract description 108
- 229910052913 potassium silicate Inorganic materials 0.000 claims abstract description 108
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 104
- 239000002002 slurry Substances 0.000 claims abstract description 35
- 239000003365 glass fiber Substances 0.000 claims abstract description 28
- 239000000945 filler Substances 0.000 claims abstract description 25
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 21
- 230000008719 thickening Effects 0.000 claims abstract description 21
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 16
- 239000003755 preservative agent Substances 0.000 claims abstract description 16
- 230000002335 preservative effect Effects 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000004965 Silica aerogel Substances 0.000 claims abstract description 12
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 44
- 235000012239 silicon dioxide Nutrition 0.000 claims description 44
- 239000000243 solution Substances 0.000 claims description 33
- 239000002518 antifoaming agent Substances 0.000 claims description 15
- 239000012752 auxiliary agent Substances 0.000 claims description 15
- 239000005995 Aluminium silicate Substances 0.000 claims description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- 235000012211 aluminium silicate Nutrition 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 6
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 5
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 229920001909 styrene-acrylic polymer Polymers 0.000 claims description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 4
- 239000010881 fly ash Substances 0.000 claims description 4
- 230000003301 hydrolyzing effect Effects 0.000 claims description 4
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 4
- 239000000347 magnesium hydroxide Substances 0.000 claims description 4
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 4
- 239000010451 perlite Substances 0.000 claims description 4
- 235000019362 perlite Nutrition 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- CPUDPFPXCZDNGI-UHFFFAOYSA-N triethoxy(methyl)silane Chemical compound CCO[Si](C)(OCC)OCC CPUDPFPXCZDNGI-UHFFFAOYSA-N 0.000 claims description 4
- 239000004593 Epoxy Substances 0.000 claims description 3
- 239000011324 bead Substances 0.000 claims description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 3
- 150000001335 aliphatic alkanes Chemical class 0.000 claims description 2
- 239000007822 coupling agent Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000007935 neutral effect Effects 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 abstract description 12
- 229910008051 Si-OH Inorganic materials 0.000 abstract description 6
- 229910006358 Si—OH Inorganic materials 0.000 abstract description 6
- 238000009833 condensation Methods 0.000 abstract description 3
- 230000005494 condensation Effects 0.000 abstract description 3
- 238000004132 cross linking Methods 0.000 abstract description 3
- 230000004048 modification Effects 0.000 abstract description 3
- 238000012986 modification Methods 0.000 abstract description 3
- 239000013530 defoamer Substances 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 65
- 239000000463 material Substances 0.000 description 22
- 238000002156 mixing Methods 0.000 description 20
- 238000006243 chemical reaction Methods 0.000 description 12
- 239000002585 base Substances 0.000 description 11
- 239000008367 deionised water Substances 0.000 description 10
- 229910021641 deionized water Inorganic materials 0.000 description 10
- 239000007788 liquid Substances 0.000 description 10
- 239000002245 particle Substances 0.000 description 10
- 230000007062 hydrolysis Effects 0.000 description 9
- 238000006460 hydrolysis reaction Methods 0.000 description 9
- 238000001035 drying Methods 0.000 description 8
- 238000004321 preservation Methods 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 4
- 239000012855 volatile organic compound Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- 229910010272 inorganic material Inorganic materials 0.000 description 2
- 239000011147 inorganic material Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000013022 formulation composition Substances 0.000 description 1
- 229910052909 inorganic silicate Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 125000002467 phosphate group Chemical class [H]OP(=O)(O[H])O[*] 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
- C09D1/02—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances alkali metal silicates
- C09D1/04—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances alkali metal silicates with organic additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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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
- 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
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Abstract
A high-bonding-strength aqueous inorganic aerogel thermal insulation coating and a preparation method thereof are disclosed, wherein modified high-modulus potassium silicate emulsion is added into a container for stirring, then hydrophobic silica aerogel slurry, thickening filler and glass fiber chopped strands are sequentially added in the stirring process, and finally defoamer, pH regulator, flatting agent and aqueous preservative are added. The modulus of the potassium silicate is increased by utilizing the cross-linking condensation between Si-OH in the silica sol and Si-OH in the low-modulus potassium silicate solution, and the silane coupling agent and the silicone-acrylate emulsion are added for modification, so that the bonding strength of the coating is improved, and the coating has high bonding strength (more than 0.05MPa), excellent fire resistance limit (more than or equal to 120min), excellent heat insulation performance (coefficient of thermal conductivity: 0.030-0.050W/(m.K)) and A-level combustion performance.
Description
Technical Field
The invention relates to the field of material heat preservation, in particular to a high-bonding-strength water-based inorganic aerogel heat preservation coating and a preparation method thereof.
Background
In recent years, the principle of green and sustainable development is advocated in China, which becomes the driving force for promoting the development of inorganic coatings. During the production and construction of the organic coating, various Volatile Organic Compounds (VOC) can be dispersed into the air, and the VOC can pollute the atmosphere and threaten the human health. Corresponding laws and policies are made by all countries around the world, and the generation of VOC in the coating is limited.
The inorganic coating is prepared by taking silicate or phosphate compounds as a main adhesive and adding filler, auxiliary agent, pigment and filler and the like, and the main component of the inorganic coating is an inorganic component. At present, the common adhesive for inorganic coatings is water glass, and the water glass is a transparent glassy fusant with a general formula of R 2 O·nSiO 2 Wherein R is 2 O is alkali metal oxide, n is water glass modulus, and R is one ion of potassium, sodium, lithium and ammonium. Currently, the coating industry is developing towards water-based, functional and green environmental protection. The inorganic paint has been widely popularized and used at home and abroad due to the advantages of wide raw material source, no toxicity, no harm, fire resistance, good environmental compatibility and the like, and the inorganic paint is widely used on buildings and members such as building interior walls, stations and airports, steel members, industrial equipment and the like.
The use of aqueous inorganic thermal insulation coatings is undoubtedly quite beneficial for environmental protection, resource conservation and the guarantee of personal health. At present, inorganic coatings used in the market do not have a heat preservation function, the bonding strength of the coatings is poor, and most of the coatings with the heat preservation function are organic coatings, so that the development of a high-bonding-strength inorganic coating with the heat preservation performance for buildings and various scenes needing fire resistance and heat preservation is urgently needed.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a high-bonding-strength aqueous inorganic aerogel thermal insulation coating and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-bonding-strength water-based inorganic aerogel thermal insulation coating comprises the following raw materials: modified high-modulus potassium silicate emulsion, hydrophobic silica aerogel, glass fiber chopped strands and an auxiliary agent; the auxiliary agent comprises: water-based defoaming agent, flatting agent, pH regulator and water-based preservative.
The preparation method of the high-bonding-strength aqueous inorganic aerogel thermal insulation coating comprises the following steps: adding the modified high-modulus potassium silicate emulsion into a container, stirring, sequentially adding the hydrophobic silica aerogel slurry, the thickening filler and the glass fiber chopped strands in the stirring process, and finally adding the defoaming agent, the pH regulator, the leveling agent and the water-based preservative.
The preparation method of the modified high-modulus potassium silicate emulsion comprises two methods.
Firstly, the preparation method of the modified high-modulus potassium silicate emulsion comprises the following steps: adding neutral silica sol into a potassium silicate solution, controlling the temperature to be 30-150 ℃, fully reacting to obtain a solution A1, dropwise adding a silane coupling agent into the solution A1, fully hydrolyzing the silane coupling agent to obtain a solution B1, dropwise adding an organic emulsion into the solution B1, controlling the temperature to be 20-80 ℃, and fully reacting to obtain the modified high-modulus potassium silicate emulsion. The mass ratio of the organic emulsion to the potassium silicate is 1: 0.1-5.
Secondly, the preparation method of the modified high-modulus potassium silicate emulsion comprises the following steps: preparing a hydrophilic silicon dioxide aerogel aqueous solution, slowly adding a potassium silicate solution, controlling the temperature to be 30-150 ℃, fully reacting to obtain a solution A2, slowly dropwise adding a silane coupling agent into the solution A2, fully hydrolyzing the silane coupling agent to obtain a solution B2, dropwise adding an organic emulsion into the solution B2, controlling the temperature to be 20-80 ℃, and fully reacting to obtain the modified high-modulus potassium silicate emulsion. The mass ratio of the potassium silicate to the hydrophilic silicon dioxide aerogel aqueous solution is 1: 2-10; the mass ratio of the organic emulsion to the hydrophilic silicon dioxide aerogel aqueous solution is 1: 0.1-5.
The alkane coupling agent is one or more of KH 550, KH 560, KH570, methyl triethoxysilane and vinyl trimethoxysilane; the organic emulsion is one or more of styrene-acrylic emulsion, epoxy emulsion, organic silicon emulsion, silicone-acrylic emulsion and pure acrylic emulsion.
The mass ratio of the silicon dioxide aerogel slurry to the modified high-modulus potassium silicate emulsion is 1: 0.1-1.
The thickening filler is one or more of kaolin, fly ash, perlite powder, silicon carbide, glass beads, calcium carbonate and magnesium hydroxide, and the mass ratio of the thickening filler to the modified high-modulus potassium silicate emulsion is 1: 0.1-0.5.
The mass ratio of the glass fiber chopped strands to the modified high-modulus potassium silicate emulsion is 1: 0.05-0.5.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
according to the invention, the modulus of the potassium silicate is increased by utilizing the cross-linking condensation between Si-OH in the silica sol and Si-OH in the low-modulus potassium silicate solution, and the silane coupling agent and the silicone-acrylic emulsion are added for modification, so that the bonding strength of the coating is improved, and the coating has high bonding strength (more than 0.05MPa), excellent fire resistance limit (more than or equal to 120min), excellent heat insulation performance (coefficient of thermal conductivity: 0.030-0.050W/(m.K)) and grade-A combustion performance.
Drawings
FIG. 1 is an infrared spectrum of the modified high modulus potassium silicate emulsion of example 1.
FIG. 2 is an SEM image of the high-bonding-strength water-based inorganic insulating coating of example 1.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.
Example 1
The preparation method of the high-bonding-strength aqueous inorganic aerogel thermal insulation coating comprises the following steps:
1. preparing modified high-modulus potassium silicate emulsion: pouring 10g of potassium silicate solution and 5g of deionized water into a three-neck flask, controlling the temperature at 65-70 ℃, slowly adding 5.9g of silica sol, dropwise adding 0.1g of KH 550 after full reaction, dropwise adding 0.5g of styrene-acrylic emulsion after full hydrolysis of a silane coupling agent, controlling the temperature at 20 ℃, and fully reacting to obtain the modified high-modulus potassium silicate emulsion with uniform particles and bluish color.
2. And taking the prepared modified high-modulus potassium silicate emulsion as a base material liquid, adding silicon dioxide aerogel slurry, and fully mixing to obtain a mixture C, wherein the mass ratio of the silicon dioxide aerogel slurry to the modified high-modulus potassium silicate emulsion is 1: 0.1. The silicon dioxide aerogel slurry is a stable and uniform fluid-to-paste material formed by dispersing hydrophobic silicon dioxide aerogel in a water system.
3. And adding kaolin into the mixture C, and fully mixing to obtain a mixture D, wherein the mass ratio of the kaolin to the modified high-modulus potassium silicate emulsion is 1: 0.5.
4. Adding the glass fiber chopped strands into the mixture D, and fully dispersing for 30min to obtain a mixture E, wherein the mass ratio of the glass fiber chopped strands to the modified high-modulus potassium silicate emulsion is 1: 0.1.
5. And sequentially adding the auxiliary agents into the mixture E, wherein the addition sequence comprises the defoaming agent, the pH regulator, the flatting agent and the water-based preservative.
TABLE 1
| Serial number | Composition of | Content/%) |
| 1 | Modified high modulus potassium silicate emulsion | 58 |
| 2 | Hydrophobic silica aerogels | 15 |
| 3 | Thickening filler | 0.5 |
| 4 | Defoaming agent | 0.5 |
| 5 | Short glass fiber filament | 10 |
| 6 | pH regulator | 0.2 |
| 7 | Leveling agent | 0.3 |
| 8 | Aqueous preservative | 0.2 |
| 9 | Water (W) | 15.3 |
TABLE 2
Table 1 shows the formulation composition and content of example 1, and Table 2 shows the technical parameters of the high-bonding-strength aqueous inorganic thermal insulation coating prepared in example 1. The coating prepared by the embodiment can have a good heat insulation effect only by being coated for 2mm, the construction efficiency can be improved, and the surface drying of the coating can be realized by standing for 1.5 hours at room temperature (25 ℃).
FIG. 1 is an infrared spectrum of a modified high modulus potassium silicate emulsion with modulus 5, and FIG. 2 is an SEM image of a high adhesion strength aqueous inorganic aerogel thermal insulation coating.
Example 2
The preparation method of the high-bonding-strength aqueous inorganic aerogel thermal insulation coating comprises the following steps:
1. preparing modified high-modulus potassium silicate emulsion: 2.5g of 100-mesh hydrophilic silicon dioxide powder is dissolved in 10g of deionized water, stirred at the speed of 800r/min, the temperature is controlled at 45 ℃, 12.5g of potassium silicate solution is slowly dripped after the reaction, 0.1g of vinyl trimethoxy silane is dripped after the reaction is fully carried out, 0.6g of epoxy emulsion is dripped after the silane coupling agent is fully hydrolyzed, the temperature is controlled at 20 ℃, and the modified high-modulus potassium silicate emulsion with uniform particles and bluish color is obtained after the reaction is fully carried out.
2. And taking the prepared modified high-modulus potassium silicate emulsion as a base material liquid, adding silicon dioxide aerogel slurry, and fully mixing to obtain a mixture C, wherein the mass ratio of the silicon dioxide aerogel slurry to the modified high-modulus potassium silicate emulsion is 1: 0.1. The silicon dioxide aerogel slurry is a stable and uniform fluid-to-paste material formed by dispersing hydrophobic silicon dioxide aerogel in a water system.
3. And adding a thickening filler into the mixture C, and fully mixing to obtain a mixture D, wherein the thickening filler is kaolin, and the mass ratio of the kaolin to the modified high-modulus potassium silicate emulsion is 1: 0.2.
4. Adding the glass fiber short shreds into the mixture D, and fully dispersing for 30min to obtain a mixture E, wherein the mass ratio of the glass fiber short shreds to the modified high-modulus potassium silicate emulsion is 1: 0.02.
5. And sequentially adding the auxiliary agents into the mixture E, wherein the addition sequence comprises the defoaming agent, the pH regulator, the flatting agent and the aqueous preservative, so as to obtain the high-adhesion-strength aqueous inorganic aerogel thermal insulation coating.
The properties of the coatings prepared in the examples are as follows:
the coating has the advantages of 2mm after being applied, surface dryness after 1.5h, 0.045W/(m.K) of thermal conductivity coefficient, 0.072MPa of bonding strength, 120min of fire endurance and A2 grade of combustion grade.
Example 3
The preparation method of the high-bonding-strength aqueous inorganic aerogel thermal insulation coating comprises the following steps:
1. preparing modified high-modulus potassium silicate emulsion: dissolving 2.5g of 100-mesh hydrophilic silicon dioxide powder in 10g of deionized water, stirring at the speed of 500r/min, controlling the temperature at 50 ℃, slowly dripping 15g of potassium silicate solution, dripping 0.1g of methyltriethoxysilane after full reaction, dripping 0.6g of organic silicon emulsion after full hydrolysis of a silane coupling agent, controlling the temperature at 35 ℃, and fully reacting to obtain the modified high-modulus potassium silicate emulsion with uniform particles and bluish color.
2. And taking the prepared modified high-modulus potassium silicate emulsion as a base material liquid, adding silicon dioxide aerogel slurry, and fully mixing to obtain a mixture C, wherein the mass ratio of the silicon dioxide aerogel slurry to the modified high-modulus potassium silicate emulsion is 1: 0.5. The silica aerogel slurry is a stable and uniform fluid-to-paste material formed by dispersing hydrophobic silica aerogel in a water system.
3. And adding a thickening filler into the mixture C, and fully mixing to obtain a mixture D, wherein the thickening filler is perlite powder and the mass ratio of the perlite powder to the modified high-modulus potassium silicate emulsion is 1: 1.
4. Adding the glass fiber chopped strands into the mixture D, and fully dispersing for 30min to obtain a mixture E, wherein the mass ratio of the glass fiber chopped strands to the modified high-modulus potassium silicate emulsion is 1: 0.2.
5. And sequentially adding the auxiliary agents into the mixture E, wherein the addition is performed sequentially by using the defoaming agent, the pH regulator, the flatting agent and the aqueous preservative, so as to obtain the high-bonding-strength aqueous inorganic aerogel heat-insulating coating.
The properties of the coatings prepared in the examples are as follows:
the coating has the advantages of 2mm after being coated, surface drying after 1.5h, 0.042W/(m.K) of thermal conductivity coefficient, 0.06MPa of bonding strength, 122min of fire resistance limit and A2 grade of combustion grade.
Example 4
The preparation method of the high-bonding-strength aqueous inorganic aerogel thermal insulation coating comprises the following steps:
1. preparing modified high-modulus potassium silicate emulsion: pouring 15g of potassium silicate solution and 6g of deionized water into a three-neck flask at 500r/min, controlling the temperature at 80 ℃, slowly adding 7g of silica sol, dropwise adding 0.1g of KH 560 after full reaction, dropwise adding 0.5g of silicone-acrylic emulsion after full hydrolysis of a silane coupling agent, controlling the temperature at 20 ℃, and fully reacting to obtain the modified high-modulus potassium silicate emulsion with uniform particles and bluish color.
2. Taking the prepared modified high-modulus potassium silicate emulsion as a base material liquid, adding silicon dioxide aerogel slurry, and fully mixing to obtain a mixture C, wherein the mass ratio of the silicon dioxide aerogel slurry to the modified high-modulus potassium silicate emulsion is 1: 0.3. the silica aerogel slurry is a stable and uniform fluid-to-paste material formed by dispersing hydrophobic silica aerogel in a water system.
3. Adding fly ash into the mixture C, and fully mixing to obtain a mixture D, wherein the mass ratio of the mixture D to the modified high-modulus potassium silicate emulsion is 1: 0.6.
4. Adding the glass fiber short shreds into the mixture D, and fully dispersing for 30min to obtain a mixture E, wherein the mass ratio of the glass fiber short shreds to the modified high-modulus potassium silicate emulsion is 1: 0.4.
5. And sequentially adding the auxiliary agents into the mixture E, wherein the addition sequence comprises the defoaming agent, the pH regulator, the flatting agent and the water-based preservative.
The coating is 2mm in thickness, surface drying can be realized after 1.5h, the thermal conductivity coefficient of the coating is 0.040W/(m.K), the bonding strength is 0.065MPa, the fire endurance is 135min, and the combustion grade is A2 grade.
Example 5
The preparation method of the high-bonding-strength aqueous inorganic aerogel thermal insulation coating comprises the following steps:
1. preparing modified high-modulus potassium silicate emulsion: pouring 8g of potassium silicate solution and 4g of deionized water into a three-neck flask, controlling the temperature at 65 ℃ for 500r/min, slowly adding 5g of silica sol, dropwise adding 0.2g of KH570 after full reaction, dropwise adding 0.3g of silicone-acrylic emulsion after full hydrolysis of a silane coupling agent, controlling the temperature at 30 ℃, and fully reacting to obtain the modified high-modulus potassium silicate emulsion with uniform particles and bluish color.
2. Taking the prepared modified high-modulus potassium silicate emulsion as a base material liquid, adding silicon dioxide aerogel slurry, and fully mixing to obtain a mixture C, wherein the mass ratio of the silicon dioxide aerogel slurry to the modified high-modulus potassium silicate emulsion is 1: 0.3. the silicon dioxide aerogel slurry is a stable and uniform fluid-to-paste material formed by dispersing hydrophobic silicon dioxide aerogel in a water system.
3. And adding magnesium hydroxide into the mixture C, and fully mixing to obtain a mixture D, wherein the mass ratio of the mixture D to the modified high-modulus potassium silicate emulsion is 1: 0.7.
4. Adding the glass fiber chopped strands into the mixture D, and fully dispersing for 30min to obtain a mixture E, wherein the mass ratio of the glass fiber chopped strands to the modified high-modulus potassium silicate emulsion is 1: 0.01.
5. And sequentially adding the auxiliary agents into the mixture E, wherein the addition sequence comprises the defoaming agent, the pH regulator, the flatting agent and the water-based preservative.
The coating has the advantages of 2mm of thickness, 1.5h of surface dryness after application, 0.035W/(m.K) of thermal conductivity coefficient, 0.060MPa of bonding strength, 133min of fire resistance limit and A2 of combustion grade.
Example 6
The preparation method of the high-bonding-strength aqueous inorganic aerogel thermal insulation coating comprises the following steps:
1. preparing modified high-modulus potassium silicate emulsion: dissolving 5g of 100-mesh hydrophilic silicon dioxide powder in 15g of deionized water, stirring at the speed of 800r/min, controlling the temperature at 55 ℃, slowly dripping 20g of potassium silicate solution, dripping 0.05g of KH 550 after full reaction, dripping 0.6g of styrene-acrylic emulsion after full hydrolysis of a silane coupling agent, controlling the temperature at 20 ℃, and fully reacting to obtain the modified high-modulus potassium silicate emulsion with uniform particles and bluish color.
2. And taking the prepared modified high-modulus potassium silicate emulsion as a base material liquid, adding silicon dioxide aerogel slurry, and fully mixing to obtain a mixture C, wherein the mass ratio of the silicon dioxide aerogel slurry to the modified high-modulus potassium silicate emulsion is 1: 1. The silicon dioxide aerogel slurry is a stable and uniform fluid-to-paste material formed by dispersing hydrophobic silicon dioxide aerogel in a water system.
3. And adding a thickening filler into the mixture C, and fully mixing to obtain a mixture D, wherein the thickening filler is glass beads, and the mass ratio of the thickening filler to the modified high-modulus potassium silicate emulsion is 1: 0.05.
4. And adding the glass fiber short shreds into the mixture D, and fully dispersing for 30min to obtain a mixture E, wherein the mass ratio of the glass fiber short shreds to the modified high-modulus potassium silicate emulsion is 1: 0.06.
5. And sequentially adding the auxiliary agents into the mixture E, wherein the addition is performed sequentially by using the defoaming agent, the pH regulator, the flatting agent and the aqueous preservative, so as to obtain the high-bonding-strength aqueous inorganic aerogel heat-insulating coating.
The properties of the coatings prepared in the examples are as follows:
the coating has the advantages of 2mm after being coated, surface drying after 1.5h, 0.041W/(m.K) of heat conductivity coefficient, 0.063MPa of bonding strength, 127min of fire resistance limit and A2 grade of combustion grade.
Example 7
The preparation method of the high-bonding-strength aqueous inorganic aerogel thermal insulation coating comprises the following steps:
1. preparing modified high-modulus potassium silicate emulsion: pouring 10g of potassium silicate solution and 4g of deionized water into a three-neck flask, 500r/min, controlling the temperature at 75 ℃, slowly adding 5g of silica sol, dropwise adding 0.2g of vinyl trimethoxy silane after full reaction, dropwise adding 1g of pure acrylic emulsion after full hydrolysis of a silane coupling agent, controlling the temperature at 20 ℃, and fully reacting to obtain the modified high-modulus potassium silicate emulsion with uniform particles and bluish color.
2. Taking the prepared modified high-modulus potassium silicate emulsion as a base material liquid, adding silicon dioxide aerogel slurry, and fully mixing to obtain a mixture C, wherein the mass ratio of the silicon dioxide aerogel slurry to the modified high-modulus potassium silicate emulsion is 1: 0.6. the silicon dioxide aerogel slurry is a stable and uniform fluid-to-paste material formed by dispersing hydrophobic silicon dioxide aerogel in a water system.
3. Adding fly ash into the mixture C, and fully mixing to obtain a mixture D, wherein the mass ratio of the mixture D to the modified high-modulus potassium silicate emulsion is 1: 0.4.
4. Adding the glass fiber chopped strands into the mixture D, and fully dispersing for 30min to obtain a mixture E, wherein the mass ratio of the glass fiber chopped strands to the modified high-modulus potassium silicate emulsion is 1: 0.05.
5. And sequentially adding the auxiliary agents into the mixture E, wherein the addition sequence comprises the defoaming agent, the pH regulator, the flatting agent and the water-based preservative.
The coating has the advantages of 2mm after being coated, surface drying after 1h, 0.037W/(m.K) of coating thermal conductivity, 0.066MPa of bonding strength, 128min of fire resistance limit and A2 grade of combustion grade.
Example 8
The preparation method of the high-bonding-strength aqueous inorganic aerogel thermal insulation coating comprises the following steps:
1. preparing modified high-modulus potassium silicate emulsion: dissolving 25g of 100-mesh hydrophilic silicon dioxide powder in 10g of deionized water, stirring at the speed of 500r/min, controlling the temperature at 55 ℃, slowly dripping 10g of potassium silicate solution, dripping 0.1g of methyltriethoxysilane after full reaction, dripping 1g of organic silicon emulsion after full hydrolysis of a silane coupling agent, controlling the temperature at 25 ℃, and fully reacting to obtain the modified high-modulus potassium silicate emulsion with uniform particles and bluish color.
2. And taking the prepared modified high-modulus potassium silicate emulsion as a base material liquid, adding silicon dioxide aerogel slurry, and fully mixing to obtain a mixture C, wherein the mass ratio of the silicon dioxide aerogel slurry to the modified high-modulus potassium silicate emulsion is 1: 0.5. The silicon dioxide aerogel slurry is a stable and uniform fluid-to-paste material formed by dispersing hydrophobic silicon dioxide aerogel in a water system.
3. And adding a thickening filler into the mixture C, and fully mixing to obtain a mixture D, wherein the thickening filler is silicon carbide, and the mass ratio of the thickening filler to the modified high-modulus potassium silicate emulsion is 1: 0.8.
4. Adding the glass fiber chopped strands into the mixture D, and fully dispersing for 30min to obtain a mixture E, wherein the mass ratio of the glass fiber chopped strands to the modified high-modulus potassium silicate emulsion is 1: 0.9.
5. And sequentially adding the auxiliary agents into the mixture E, wherein the addition is performed sequentially by using the defoaming agent, the pH regulator, the flatting agent and the aqueous preservative, so as to obtain the high-bonding-strength aqueous inorganic aerogel heat-insulating coating.
The properties of the coatings prepared in the examples are as follows:
the coating is 2mm in thickness, surface drying can be realized after 1.5h, the thermal conductivity coefficient of the coating is 0.047W/(m.K), the bonding strength is 0.064MPa, the fire resistance limit is 126min, and the combustion grade is A2 grade.
Example 9
The preparation method of the high-bonding-strength aqueous inorganic aerogel thermal insulation coating comprises the following steps:
1. preparing modified high-modulus potassium silicate emulsion: dissolving 5g of 100-mesh hydrophilic silicon dioxide powder in 5g of deionized water, stirring at the speed of 500r/min, controlling the temperature at 70 ℃, slowly dripping 7g of potassium silicate solution, dripping 0.05g of KH570 after full reaction, dripping 0.8g of organic silicon emulsion after full hydrolysis of a silane coupling agent, controlling the temperature at 30 ℃, and fully reacting to obtain the modified high-modulus potassium silicate emulsion with uniform particles and bluish colors.
2. And taking the prepared modified high-modulus potassium silicate emulsion as a base material liquid, adding silicon dioxide aerogel slurry, and fully mixing to obtain a mixture C, wherein the mass ratio of the silicon dioxide aerogel slurry to the modified high-modulus potassium silicate emulsion is 1: 08. The silicon dioxide aerogel slurry is a stable and uniform fluid-to-paste material formed by dispersing hydrophobic silicon dioxide aerogel in a water system.
3. And adding a thickening filler into the mixture C, and fully mixing to obtain a mixture D, wherein the thickening filler is calcium carbonate, and the mass ratio of the thickening filler to the modified high-modulus potassium silicate emulsion is 1: 0.3.
4. Adding the glass fiber chopped strands into the mixture D, and fully dispersing for 30min to obtain a mixture E, wherein the mass ratio of the glass fiber chopped strands to the modified high-modulus potassium silicate emulsion is 1: 0.7.
5. And sequentially adding the auxiliary agents into the mixture E, wherein the addition sequence comprises the defoaming agent, the pH regulator, the flatting agent and the aqueous preservative, so as to obtain the high-adhesion-strength aqueous inorganic aerogel thermal insulation coating.
The properties of the coatings prepared in the examples are as follows:
the coating is 2mm in thickness, surface drying can be realized after 1.5h, the thermal conductivity coefficient of the coating is 0.041W/(m.K), the bonding strength is 0.060MPa, the fire endurance is 129min, and the combustion grade is A2 grade.
Example 10
The preparation method of the high-bonding-strength aqueous inorganic aerogel thermal insulation coating comprises the following steps:
1. preparing modified high-modulus potassium silicate emulsion: pouring 12g of potassium silicate solution and 5.5g of deionized water into a three-neck flask, controlling the temperature at 70 ℃ for 500r/min, slowly adding 5.5g of silica sol, dropwise adding 0.05g of vinyl trimethoxy silane after full reaction, dropwise adding 1g of styrene-acrylic emulsion after full hydrolysis of a silane coupling agent, controlling the temperature at 25 ℃, and fully reacting to obtain the modified high-modulus potassium silicate emulsion with uniform particles and bluish color.
2. Taking the prepared modified high-modulus potassium silicate emulsion as a base material liquid, adding silicon dioxide aerogel slurry, and fully mixing to obtain a mixture C, wherein the mass ratio of the silicon dioxide aerogel slurry to the modified high-modulus potassium silicate emulsion is 1: 2. the silicon dioxide aerogel slurry is a stable and uniform fluid-to-paste material formed by dispersing hydrophobic silicon dioxide aerogel in a water system.
3. And adding magnesium hydroxide into the mixture C, and fully mixing to obtain a mixture D, wherein the mass ratio of the mixture D to the modified high-modulus potassium silicate emulsion is 1: 0.45.
4. Adding the glass fiber chopped strands into the mixture D, and fully dispersing for 30min to obtain a mixture E, wherein the mass ratio of the glass fiber chopped strands to the modified high-modulus potassium silicate emulsion is 1: 0.12.
5. And sequentially adding the auxiliary agents into the mixture E, wherein the addition sequence comprises the defoaming agent, the pH regulator, the flatting agent and the water-based preservative.
The coating has the advantages of 2mm after being coated, surface drying after 1h, 0.036W/(m.K) of coating thermal conductivity, 0.061MPa of bonding strength, 124min of fire endurance and A2-grade combustion grade.
The inorganic heat-insulating coating is mainly prepared by taking inorganic materials such as inorganic silicate and the like as raw materials and taking hydrophobic silica aerogel as heat-insulating filler, and because the inorganic materials have poor self-adhesive degree and poor mechanical property of the silica aerogel, the inorganic heat-insulating coating has poor adhesive strength, the surface of the coating is easy to crack, the coating cannot be tightly adhered to a wall surface or a component after being coated and is easy to fall off, and the surface of the coating is easy to fall off after being dried. The invention provides two methods which use modified high modulus potassium silicate emulsion as a base material, increase the modulus of potassium silicate by using the cross-linking condensation between Si-OH in silica sol and Si-OH in low modulus potassium silicate solution, add silane coupling agent and silicone acrylic emulsion for modification, improve the bonding strength of the coating, and then use SiO 2 The aerogel is used as a filler, and the characteristics of extremely low thermal conductivity, low density and incombustibility of the aerogel are utilized, so that the coating has high bonding strength (more than 0.05MPa), excellent heat preservation performance (the thermal conductivity is 0.030-0.050W/(m.K)), excellent fire resistance limit (more than or equal to 120min) and A-level combustion performance.
Claims (10)
1. The high-bonding-strength water-based inorganic aerogel thermal insulation coating is characterized by comprising the following raw materials: modified high-modulus potassium silicate emulsion, hydrophobic silica aerogel, glass fiber chopped strands and an auxiliary agent; the auxiliary agent comprises: water-based defoaming agent, flatting agent, pH regulator and water-based preservative.
2. The preparation method of the high-bonding-strength aqueous inorganic aerogel thermal insulation coating as claimed in claim 1, which is characterized in that: adding the modified high-modulus potassium silicate emulsion into a container, stirring, then sequentially adding the hydrophobic silica aerogel slurry, the thickening filler and the glass fiber chopped strands in the stirring process, and finally adding the defoaming agent, the pH regulator, the leveling agent and the water-based preservative.
3. The method of claim 2, wherein the modified high modulus potassium silicate emulsion is prepared by the following method: adding neutral silica sol into the potassium silicate solution, controlling the temperature to be 30-150 ℃, fully reacting to obtain a solution A1, dropwise adding a silane coupling agent into the solution A1, fully hydrolyzing the silane coupling agent to obtain a solution B1, dropwise adding an organic emulsion into the solution B1, controlling the temperature to be 20-80 ℃, and fully reacting to obtain the modified high-modulus potassium silicate emulsion.
4. The method of claim 3, wherein: the mass ratio of the organic emulsion to the potassium silicate is 1: 0.1-5.
5. The method of claim 2, wherein the modified high modulus potassium silicate emulsion is prepared by the following method: preparing a hydrophilic silicon dioxide aerogel aqueous solution, slowly adding a potassium silicate solution, controlling the temperature to be 30-150 ℃, fully reacting to obtain a solution A2, slowly dropwise adding a silane coupling agent into the solution A2, fully hydrolyzing the silane coupling agent to obtain a solution B2, dropwise adding an organic emulsion into the solution B2, controlling the temperature to be 20-80 ℃, and fully reacting to obtain the modified high-modulus potassium silicate emulsion.
6. The method of claim 5, wherein: the mass ratio of the potassium silicate to the hydrophilic silicon dioxide aerogel aqueous solution is 1: 2-10; the mass ratio of the organic emulsion to the hydrophilic silicon dioxide aerogel aqueous solution is 1: 0.1-5.
7. The production method according to claim 3 or 5, characterized in that: the alkane coupling agent is one or more of KH 550, KH 560, KH570, methyl triethoxysilane and vinyl trimethoxysilane; the organic emulsion is one or more of styrene-acrylic emulsion, epoxy emulsion, organic silicon emulsion, silicone-acrylic emulsion and pure acrylic emulsion.
8. The method of claim 2, wherein: the mass ratio of the silicon dioxide aerogel slurry to the modified high-modulus potassium silicate emulsion is 1: 0.1-1.
9. The method of claim 2, wherein: the thickening filler is one or more of kaolin, fly ash, perlite powder, silicon carbide, glass beads, calcium carbonate and magnesium hydroxide, and the mass ratio of the thickening filler to the modified high-modulus potassium silicate emulsion is 1: 0.1-0.5.
10. The method of claim 2, wherein: the mass ratio of the glass fiber chopped strands to the modified high-modulus potassium silicate emulsion is 1: 0.05-0.5.
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| CN115851010A (en) * | 2022-12-14 | 2023-03-28 | 富思特新材料科技发展股份有限公司 | Inorganic coating and preparation method and application thereof |
| CN116254019A (en) * | 2023-02-10 | 2023-06-13 | 厦门大学古雷石化研究院 | Water-based sound-insulation damping flow variant material for aircraft deck as well as preparation method and application thereof |
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| CN113527927A (en) * | 2021-07-09 | 2021-10-22 | 福建蓝烟新材料有限公司 | Water-based heat-insulating non-intumescent fire retardant coating and preparation method thereof |
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| CN113527927A (en) * | 2021-07-09 | 2021-10-22 | 福建蓝烟新材料有限公司 | Water-based heat-insulating non-intumescent fire retardant coating and preparation method thereof |
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| CN115537059A (en) * | 2022-10-27 | 2022-12-30 | 长沙标朗住工科技有限公司 | Coating additive, antirust aldehyde-removing antiviral coating and preparation method |
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