CN117126571A - Water-based heat insulation coating prepared from hydrophobic silica aerogel and preparation method thereof - Google Patents
Water-based heat insulation coating prepared from hydrophobic silica aerogel and preparation method thereof Download PDFInfo
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- CN117126571A CN117126571A CN202311100491.2A CN202311100491A CN117126571A CN 117126571 A CN117126571 A CN 117126571A CN 202311100491 A CN202311100491 A CN 202311100491A CN 117126571 A CN117126571 A CN 117126571A
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- 238000000576 coating method Methods 0.000 title claims abstract description 67
- 239000011248 coating agent Substances 0.000 title claims abstract description 66
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 239000004965 Silica aerogel Substances 0.000 title claims abstract description 58
- 230000002209 hydrophobic effect Effects 0.000 title claims abstract description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 238000009413 insulation Methods 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title abstract description 17
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000004964 aerogel Substances 0.000 claims abstract description 30
- 239000011521 glass Substances 0.000 claims abstract description 29
- 229920001909 styrene-acrylic polymer Polymers 0.000 claims abstract description 26
- 239000000839 emulsion Substances 0.000 claims abstract description 23
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 21
- 239000002270 dispersing agent Substances 0.000 claims abstract description 19
- 229920000168 Microcrystalline cellulose Polymers 0.000 claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 17
- 239000013530 defoamer Substances 0.000 claims abstract description 17
- 235000019813 microcrystalline cellulose Nutrition 0.000 claims abstract description 17
- 239000008108 microcrystalline cellulose Substances 0.000 claims abstract description 17
- 229940016286 microcrystalline cellulose Drugs 0.000 claims abstract description 17
- 239000002562 thickening agent Substances 0.000 claims abstract description 16
- 239000000080 wetting agent Substances 0.000 claims abstract description 16
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 15
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 15
- 239000004005 microsphere Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims description 18
- 239000011324 bead Substances 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 12
- 239000011259 mixed solution Substances 0.000 claims description 9
- 239000002994 raw material Substances 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- 230000004048 modification Effects 0.000 claims description 4
- 238000012986 modification Methods 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 3
- 239000007864 aqueous solution Substances 0.000 claims description 3
- -1 dodecanol ester Chemical class 0.000 claims description 3
- LQZZUXJYWNFBMV-UHFFFAOYSA-N ethyl butylhexanol Natural products CCCCCCCCCCCCO LQZZUXJYWNFBMV-UHFFFAOYSA-N 0.000 claims description 3
- 125000004344 phenylpropyl group Chemical group 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 2
- 239000008367 deionised water Substances 0.000 claims description 2
- 229910021641 deionized water Inorganic materials 0.000 claims description 2
- 239000003513 alkali Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000003973 paint Substances 0.000 abstract description 2
- 239000002253 acid Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 8
- 239000002131 composite material Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000012720 thermal barrier coating Substances 0.000 description 1
Classifications
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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
- C09D125/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers
- C09D125/02—Homopolymers or copolymers of hydrocarbons
- C09D125/04—Homopolymers or copolymers of styrene
- C09D125/08—Copolymers of styrene
- C09D125/14—Copolymers of styrene with unsaturated esters
-
- 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
-
- 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
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
-
- 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
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses a water-based heat-insulating coating prepared from hydrophobic silica aerogel and a preparation method thereof, wherein the water-based heat-insulating coating comprises the following components in parts by weight: 50-70 parts of hydrophobic silica aerogel, 5-10 parts of silane coupling agent, 85-105 parts of styrene-acrylic emulsion, 10-15 parts of titanium dioxide, 10-15 parts of microcrystalline cellulose, 1-3 parts of organosilicon defoamer, 1-3 parts of wetting agent PE, 2-6 parts of dispersing agent, 1-3 parts of leveling agent, 1-3 parts of film forming auxiliary agent, 1-3 parts of associative thickener and 40-60 parts of hollow glass microsphere. The water-based heat insulation aerogel paint prepared by the invention has better heat insulation performance, better water resistance and better acid and alkali resistance through tests. The water-based heat insulation aerogel coating prepared by the method has excellent performance, low production cost and wide market prospect.
Description
Technical Field
The invention belongs to the technical field of inorganic materials, and particularly relates to a water-based heat insulation coating prepared from hydrophobic silica aerogel and a preparation method thereof.
Background
The aerogel is a three-dimensional network porous structure, has very high porosity and is the material with the best heat preservation and heat insulation in the existing materials. Therefore, the aerogel is developed into a coating, and can be widely applied to industries such as industry, building, automobiles, electronics and the like. Aerogel coatings have received much attention from a number of companies and related products are on the market. However, the main preparation process is to disperse aerogel powder in a dispersing agent, and then add resin for modulation to form aerogel coating. Because the high porosity in the aerogel leads to weaker skeleton strength, the internal asymmetric tension formed in the curing process of the coating can split aerogel particles, so that the aerogel coating is succinctly split. Especially, in the practical use process of the aerogel coating, the heat preservation effect of cladding can be achieved only by more than 3mm, and the industrialized popularization of the aerogel coating is influenced by the simplicity of construction.
Aiming at the technical background, the invention aims to utilize the high added value of the aerogel product, and the cheap heat insulation coating is prepared in a large quantity by a simple method, and the silica aerogel is applied to the heat insulation coating, so that the invention has great environmental and economic significance.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the water-based heat insulation coating prepared from the hydrophobic silica aerogel and the preparation method thereof, and the water-based heat insulation coating has the advantages of low and easily available raw material cost, mild preparation conditions, easiness in mass production and the like.
The technical scheme adopted by the invention is as follows:
the water-based heat insulation coating prepared from the hydrophobic silica aerogel comprises the following components in parts by weight: 50-70 parts of hydrophobic silica aerogel, 5-10 parts of silane coupling agent, 85-105 parts of styrene-acrylic emulsion, 10-15 parts of titanium dioxide, 10-15 parts of microcrystalline cellulose, 1-3 parts of organosilicon defoamer, 1001-3 parts of wetting agent PE, 2-6 parts of dispersing agent, 1-3 parts of leveling agent, 1-3 parts of film forming auxiliary agent, 1-3 parts of associative thickener and 40-60 parts of hollow glass microsphere.
Further, the water-based heat insulation coating prepared from the hydrophobic silica aerogel comprises the following components in parts by weight: 55-60 parts of hydrophobic silica aerogel, 6-8 parts of silane coupling agent, 95-100 parts of styrene-acrylic emulsion, 11-13 parts of titanium dioxide, 11-13 parts of microcrystalline cellulose, 1.5-2.5 parts of organosilicon defoamer, 1.5-2.5 parts of wetting agent PE, 3-5 parts of dispersing agent, 1.5-2.5 parts of flatting agent, 1.5-2.5 parts of film forming additive, 1.5-2.5 parts of associative thickener and 45-50 parts of hollow glass microsphere.
Further, the particle size of the hollow glass beads is 20-50 microns, the film forming auxiliary agent is dodecanol ester, and the silane coupling agent is a silane coupling agent KH540.
Further, the preparation method for preparing the water-based heat insulation coating from the hydrophobic silica aerogel mainly comprises the following steps:
1) Weighing raw materials according to the weight parts of each component of the coating, mixing and stirring a silane coupling agent, a dispersing agent and a proper amount of water with hydrophobic silica aerogel, and carrying out hydrophilic modification on the hydrophobic silica aerogel;
2) Mixing the styrene-acrylic emulsion with water according to the mass ratio of 1:2-4, and stirring to obtain a styrene-acrylic aqueous solution;
3) Adding a wetting agent, a leveling agent and an organosilicon defoamer into the phenylpropyl water solution obtained in the step 2);
4) Adding the modified silicon dioxide aerogel mixed solution obtained in the step 1), titanium dioxide and microcrystalline cellulose into the solution obtained in the step 3), and uniformly stirring and mixing;
5) Adding hollow glass beads into the mixed solution in the step 4), and stirring and mixing;
6) Adding a film forming auxiliary agent and an associative thickener into the mixed solution in the step 5), and stirring to obtain slurry;
7) Coating and pressing the slurry obtained in the step 6) on a glass sheet, and drying at normal pressure to obtain the water-based heat insulation aerogel coating.
Further, the mass ratio of the water to the hydrophobic silica aerogel in the step 1) is 5-10:1.
Further, in the step 2), the solid content of the styrene-acrylic emulsion is 47%, and the mass ratio of the styrene-acrylic emulsion to deionized water is 1:3.
further, the normal pressure drying temperature in the step 7) is 20-40 ℃.
By adopting the technology, compared with the prior art, the invention has the following beneficial effects:
1) The invention takes the silicon dioxide aerogel, the styrene-acrylic emulsion and the hollow glass beads as raw materials, the raw material cost is extremely low, and the prepared heat insulation coating product has wide market prospect as a novel heat insulation material.
2) The hydrophobic silica aerogel is used as a raw material, and the coating has good waterproof effect in the use process. The paint product of the invention has the advantages of water resistance, alkali resistance, low temperature stability, coating temperature resistance stability and the like.
3) The invention has extremely high economic value and environmental protection significance for preparing the hydrophobic silica aerogel into the coating.
Drawings
FIG. 1 is an SEM image of a hydrophobic silica aerogel coating prepared in example 1 of the invention;
FIG. 2 is a chart of Fourier infrared (FTIR) analysis of the hydrophobic silica aerogel coating prepared in example 1 of the present invention.
Detailed Description
The following describes the technical scheme of the present invention with specific examples, but the scope of the present invention is not limited thereto:
in the embodiment of the invention, the solid content of the styrene-acrylic emulsion is 47%, the model of the hollow glass bead is S38HS, and the particle size is 40 microns. The defoamer was a silicone defoamer FM-3110 available from east Asia synthetic Co., inc. of Taiwan. The dispersant was a dispersant 0540 available from eastern synthetic Co., ltd. PE-100 wetting agent, available from Guangzhou chemical Co., ltd. The film forming aid is dodecanol ester available from Aohshingchawa chemical (Beijing) Inc. Associative thickeners are conventional commercial products available from the chemical industry of ohexanthema (beijing) limited. The silane coupling agent is silane coupling agent KH540, available from Hangzhou Jetta chemical Co. The leveling agent was leveling agent LP-100A, available from Hangzhou Jewelca chemical Co. Microcrystalline cellulose Shanghao biological medicine technologies Co.
The heat conductivity coefficient of the hydrophobic silica aerogel used in the embodiment of the invention is 0.018-0.020 m.K, and the particle size range is 0.025-0.1mm.
Example 1 preparation of silica aerogel coating
The water-based heat insulation coating prepared from the hydrophobic silica aerogel comprises the following components in parts by weight: 60 parts of hydrophobic silica aerogel, 7 parts of silane coupling agent, 95 parts of styrene-acrylic emulsion, 12 parts of titanium dioxide, 12 parts of microcrystalline cellulose, 2 parts of organosilicon defoamer, 1002 parts of wetting agent PE, 4 parts of dispersing agent, 2 parts of flatting agent, 2 parts of film forming auxiliary agent, 2 parts of associative thickener and 50 parts of hollow glass microsphere.
The preparation method for preparing the water-based heat insulation coating from the hydrophobic silica aerogel comprises the following steps:
1) Weighing raw materials according to the weight parts of each component of the coating, mixing and stirring a silane coupling agent, a dispersing agent and a proper amount of water with hydrophobic silica aerogel, and carrying out hydrophilic modification on the hydrophobic silica aerogel; wherein the mass ratio of a proper amount of water to the hydrophobic silica aerogel is 7:1;
2) Mixing the styrene-acrylic emulsion with water according to the mass ratio of 1:3, and stirring to obtain a styrene-acrylic aqueous solution;
3) Adding a wetting agent, a leveling agent and an organosilicon defoamer into the phenylpropyl water solution obtained in the step 2);
4) Adding the modified silicon dioxide aerogel mixed solution obtained in the step 1), titanium dioxide and microcrystalline cellulose into the solution obtained in the step 3), and uniformly stirring and mixing;
5) Adding hollow glass beads into the mixed solution in the step 4), and stirring and mixing;
6) Adding a film forming auxiliary agent and an associative thickener into the mixed solution in the step 5), and stirring to obtain slurry;
7) Coating and pressing the slurry obtained in the step 6) on a glass sheet, and drying at the normal pressure at the temperature of 30-35 ℃ to obtain the water-based heat insulation aerogel coating.
SEM images and fourier infrared (FTIR) analysis images of the hydrophobic silica aerogel coating prepared in example 1 of the present invention are shown in fig. 1 and 2, respectively.
Example 2 preparation of silica aerogel coating
Example 2 differs from example 1 only in the composition of the aerogel coating as follows: the composite material comprises the following components in parts by weight: 70 parts of hydrophobic silica aerogel, 7 parts of silane coupling agent, 95 parts of styrene-acrylic emulsion, 10 parts of titanium dioxide, 10 parts of microcrystalline cellulose, 2 parts of organosilicon defoamer, 2 parts of wetting agent PE-1002 parts, 2 parts of dispersing agent, 2 parts of flatting agent, 2 parts of film forming auxiliary agent, 2 parts of associative thickener and 45 parts of hollow glass microsphere.
Example 3 preparation of silica aerogel coating
Example 3 differs from example 1 only in the composition of the aerogel coating as follows: the composite material comprises the following components in parts by weight: 50 parts of hydrophobic silica aerogel, 7 parts of silane coupling agent, 85 parts of styrene-acrylic emulsion, 12 parts of titanium dioxide, 12 parts of microcrystalline cellulose, 2 parts of organosilicon defoamer, 2 parts of wetting agent PE-1002 parts of dispersing agent, 2 parts of flatting agent, 2 parts of film forming auxiliary agent, 2 parts of associative thickener and 50 parts of hollow glass microsphere.
Example 4 preparation of silica aerogel coating
Example 4 differs from example 1 only in the composition of the aerogel coating as follows: the composite material comprises the following components in parts by weight: 60 parts of hydrophobic silica aerogel, 7 parts of silane coupling agent, 90 parts of styrene-acrylic emulsion, 12 parts of titanium dioxide, 12 parts of microcrystalline cellulose, 2 parts of organosilicon defoamer, 2 parts of wetting agent PE-1002 parts of dispersing agent, 2 parts of flatting agent, 2 parts of film forming auxiliary agent, 2 parts of associative thickener and 60 parts of hollow glass microsphere.
Comparative example 1 preparation of silica aerogel coating
Comparative example 1 differs from example 1 only in the composition of the aerogel coating as follows: the composite material comprises the following components in parts by weight: 60 parts of hydrophobic silica aerogel, 7 parts of silane coupling agent, 95 parts of styrene-acrylic emulsion, 14 parts of titanium dioxide, 2 parts of organosilicon defoamer, 1002 parts of wetting agent PE, 2 parts of dispersing agent, 2 parts of flatting agent, 2 parts of film forming auxiliary agent, 2 parts of associative thickener and 50 parts of hollow glass microsphere.
Comparative example 2 preparation of silica aerogel coating
Comparative example 2 differs from example 1 only in the composition of the aerogel coating as follows: the composite material comprises the following components in parts by weight: 60 parts of hydrophobic silica aerogel, 7 parts of silane coupling agent, 95 parts of styrene-acrylic emulsion, 14 parts of microcrystalline cellulose, 2 parts of organosilicon defoamer, 2 parts of wetting agent PE-1002 parts, 2 parts of dispersing agent, 2 parts of flatting agent, 2 parts of film forming auxiliary agent, 2 parts of associative thickener and 50 parts of hollow glass microsphere.
Comparative example 3 preparation of silica aerogel coating
Comparative example 3 differs from example 1 only in the composition of the aerogel coating as follows: the composite material comprises the following components in parts by weight: 60 parts of hydrophobic silica aerogel, 95 parts of styrene-acrylic emulsion, 12 parts of titanium dioxide, 12 parts of microcrystalline cellulose, 2 parts of organosilicon defoamer, 1002 parts of wetting agent PE, 4 parts of dispersing agent, 2 parts of flatting agent, 2 parts of film forming auxiliary agent, 2 parts of associative thickener and 50 parts of hollow glass microsphere.
The performance parameters of the hydrophobic silica aerogels obtained in examples 1 to 4 of the present invention and comparative examples 1 to 3 are shown in Table 1.
TABLE 1 aerogel coating Heat conductivity coefficient table
As can be seen from Table 1, in the embodiment 4 of the present invention, the heat conductivity is higher, mainly because the hollow glass beads are added more, and the stirring is uneven due to the excessive addition of the hollow glass beads, and some hollow glass beads are broken during stirring, so that the heat conductivity is increased.
The addition of microcrystalline cellulose enhances the microstructure of the silica aerogel thermal barrier coating and the fiber-bonded coating can encapsulate substantial voids and thus exhibit lower thermal conductivity. If microcrystalline cellulose is not added, the thermal conductivity of the coating increases.
The silane coupling agent is used for modifying the silicon dioxide aerogel, and is changed from hydrophobicity to hydrophilicity. Aerogels are hydrophobic if not modified and do not readily dissolve during dissolution. Undissolved substances are unevenly distributed, and the thermal conductivity increases.
The aerogel coating disclosed by the invention can be added with the styrene-acrylic emulsion to improve the bonding strength of the coating, and meanwhile, the hollow glass microspheres are used as a lower heat conducting substance, so that the heat conducting coefficient of the coating is reduced. The hollow glass beads are added with filling effect, and in addition, the hollow glass beads have excellent sound insulation performance, higher fluidity and better dispersibility. The cost is also relatively low.
As can be seen from the above examples and comparative examples, the present invention provides a method for preparing a hydrophobic silica aerogel coating from a hydrophobic silica aerogel, comprising: modifying the styrene-acrylic emulsion by using additives such as dispersing agents; directly adding titanium dioxide and hollow glass beads; stirring the mixed system and drying at normal pressure and normal temperature. Compared with the prior art, the silica aerogel coating provided by the invention has simple equipment; the prepared hydrophobic silica aerogel coating has mild preparation conditions, low requirements on equipment and extremely high economic value.
The above embodiments are only some of the embodiments of the present invention and are not intended to limit the present invention. All equivalent changes and modifications are intended to be included within the scope of the present invention.
Claims (7)
1. The water-based heat insulation coating prepared from the hydrophobic silica aerogel is characterized by comprising the following components in parts by weight: 50-70 parts of hydrophobic silica aerogel, 5-10 parts of silane coupling agent, 85-105 parts of styrene-acrylic emulsion, 10-15 parts of titanium dioxide, 10-15 parts of microcrystalline cellulose, 1-3 parts of organosilicon defoamer, 1-3 parts of wetting agent PE, 2-6 parts of dispersing agent, 1-3 parts of leveling agent, 1-3 parts of film forming auxiliary agent, 1-3 parts of associative thickener and 40-60 parts of hollow glass microsphere.
2. The water-based heat insulation coating prepared from the hydrophobic silica aerogel according to claim 1 is characterized by comprising the following components in parts by weight: 55-60 parts of hydrophobic silica aerogel, 6-8 parts of silane coupling agent, 95-100 parts of styrene-acrylic emulsion, 11-13 parts of titanium dioxide, 11-13 parts of microcrystalline cellulose, 1.5-2.5 parts of organosilicon defoamer, 1.5-2.5 parts of wetting agent PE, 3-5 parts of dispersing agent, 1.5-2.5 parts of flatting agent, 1.5-2.5 parts of film forming additive, 1.5-2.5 parts of associative thickener and 45-50 parts of hollow glass microsphere.
3. The water-based heat insulation coating prepared from the hydrophobic silica aerogel according to claim 1 or 2, wherein the particle size of the hollow glass beads is 20-50 microns, the film forming auxiliary agent is dodecanol ester, and the silane coupling agent is silane coupling agent KH540.
4. The method for preparing the water-based heat insulation coating prepared by the hydrophobic silica aerogel according to claim 1, which is characterized by mainly comprising the following steps:
1) Weighing raw materials according to the weight parts of each component of the coating, mixing and stirring a silane coupling agent, a dispersing agent and a proper amount of water with hydrophobic silica aerogel, and carrying out hydrophilic modification on the hydrophobic silica aerogel;
2) Mixing the styrene-acrylic emulsion with water according to the mass ratio of 1:2-4, and stirring to obtain a styrene-acrylic aqueous solution;
3) Adding a wetting agent, a leveling agent and an organosilicon defoamer into the phenylpropyl water solution obtained in the step 2);
4) Adding the modified silicon dioxide aerogel mixed solution obtained in the step 1), titanium dioxide and microcrystalline cellulose into the solution obtained in the step 3), and uniformly stirring and mixing;
5) Adding hollow glass beads into the mixed solution in the step 4), and stirring and mixing;
6) Adding a film forming auxiliary agent and an associative thickener into the mixed solution in the step 5), and stirring to obtain slurry;
7) Coating and pressing the slurry obtained in the step 6) on a glass sheet, and drying at normal pressure to obtain the water-based heat insulation aerogel coating.
5. The method for preparing a hydrophobic silica aerogel prepared water-based thermal insulation coating according to claim 4, wherein the mass ratio of water to hydrophobic silica aerogel in the step 1) is 5-10:1.
6. The method for preparing the water-based heat insulation coating prepared by the hydrophobic silica aerogel according to claim 4, wherein the solid content of the styrene-acrylic emulsion in the step 2) is 47%, and the mass ratio of the styrene-acrylic emulsion to deionized water is 1:3.
7. the method for preparing a hydrophobic silica aerogel prepared water-based thermal insulation coating according to claim 4, wherein the normal pressure drying temperature in the step 7) is 20-40 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311100491.2A CN117126571A (en) | 2023-08-30 | 2023-08-30 | Water-based heat insulation coating prepared from hydrophobic silica aerogel and preparation method thereof |
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| CN202311100491.2A CN117126571A (en) | 2023-08-30 | 2023-08-30 | Water-based heat insulation coating prepared from hydrophobic silica aerogel and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118145655A (en) * | 2024-05-11 | 2024-06-07 | 山东新朗华科技有限公司 | Modified SiO2Aerogel powder, preparation method thereof and aerogel heat insulation coating |
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2023
- 2023-08-30 CN CN202311100491.2A patent/CN117126571A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118145655A (en) * | 2024-05-11 | 2024-06-07 | 山东新朗华科技有限公司 | Modified SiO2Aerogel powder, preparation method thereof and aerogel heat insulation coating |
| CN118145655B (en) * | 2024-05-11 | 2024-07-30 | 山东新朗华科技有限公司 | Modified SiO2Aerogel powder, preparation method thereof and aerogel heat insulation coating |
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