CN111826045A - Heat insulation coating for building exterior wall and preparation method thereof - Google Patents
Heat insulation coating for building exterior wall and preparation method thereof Download PDFInfo
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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
- C09D143/00—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 containing boron, silicon, phosphorus, selenium, tellurium, or a metal; Coating compositions based on derivatives of such polymers
- C09D143/04—Homopolymers or copolymers of monomers containing silicon
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- 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
- C09D5/004—Reflecting paints; Signal 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
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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
- C09D7/61—Additives non-macromolecular inorganic
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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
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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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
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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- 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
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- 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
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
Abstract
The invention discloses a heat insulation coating for building exterior walls, which is prepared from the following raw materials in parts by weight: 50-60 parts of silicone-acrylic emulsion, 18-22 parts of modified aerogel, 7-9 parts of floating beads, 3-4 parts of reinforcing filler, 2-3 parts of mirabilite and 0.6-1 part of auxiliary agent; the invention also discloses a preparation method of the heat insulation coating. The modified aerogel is added into the coating, and the silicon dioxide aerogel can be uniformly dispersed in the coating after being modified, so that the microporosity in the coating can be greatly improved, the heat conduction path can be prolonged, and the heat insulation performance of the coating can be improved; in addition, materials capable of reflecting radiant heat (rutile titanium dioxide and silicon carbide) are introduced to block a transmission path of radiant heat conduction, the phase change energy storage material (mirabilite) is used as a high-efficiency storage substance of heat energy, and the coating has excellent heat preservation and heat insulation performance by starting from three paths (conduction, radiation and convection) of heat transfer.
Description
Technical Field
The invention belongs to the technical field of building coatings, and particularly relates to a heat insulation coating for a building outer wall and a preparation method thereof.
Background
Along with the continuous acceleration of urban construction pace, the loading amount of air conditioners and heating equipment is continuously increased, so that the proportion of building energy consumption is continuously increased, the significance of building energy conservation is more and more important, and the heat insulation of building outer walls is an important link of building energy conservation. The coating applied to the outer wall concrete or the outer wall panel is exposed in the atmospheric environment and can lose the original decorative effect by the phenomena of pulverization, discoloration, peeling, stains and the like of the coating after natural changes of weather such as wind, sunshine, rain and the like, thereby influencing the appearance beauty of the building. In addition, the outer wall coating can easily absorb moisture in the air to cause the moisture content on the surface of the material to be continuously increased, and after the humidity reaches more than 30%, a suitable environment is provided for the growth and the propagation of algae, so that the outer wall can breed the mold and the algae.
At present, the performance of the heat-insulating coating of the external wall panel is improved mainly from the aspects of screening, mutual dispersion and stability of emulsion, filler and auxiliary agent, and the Chinese patent with the patent number of CN03118029.9 discloses a multifunctional nano building external wall coating and a preparation method thereof.
Disclosure of Invention
The invention aims to provide a thermal insulation coating for building exterior walls and a preparation method thereof, wherein modified aerogel is added into the coating, and the modified silicon dioxide aerogel can be grafted with long-chain alkyl on the surface to promote the uniform dispersion of the aerogel in the coating; in addition, materials capable of reflecting radiant heat (rutile titanium dioxide and silicon carbide) are introduced to block a propagation path of radiant heat conduction, and a phase change energy storage material (mirabilite) is used as a high-efficiency storage substance of heat energy, so that the overall performance of the heat insulation coating can be effectively improved by introducing the phase change energy storage material into the coating; the coating has excellent heat preservation and heat insulation performance by starting from three paths (conduction, radiation and convection) of heat transfer.
The purpose of the invention can be realized by the following technical scheme:
a heat insulation coating for building exterior walls is prepared from the following raw materials in parts by weight: 50-60 parts of silicone-acrylic emulsion, 18-22 parts of modified aerogel, 7-9 parts of floating beads, 3-4 parts of reinforcing filler, 2-3 parts of mirabilite and 0.6-1 part of auxiliary agent;
the heat insulation coating is prepared by the following steps:
and sequentially adding the silicone-acrylic emulsion, the modified aerogel, the floating beads, the reinforcing filler, the mirabilite and the auxiliary agent into a reaction kettle in proportion, stirring for 40-50min at 300r/min, then grinding for 10-12min by a high-speed dispersion grinder, and then stirring for 25-30min at 3000r/min to obtain the heat-insulating and heat-preserving coating.
Further, the auxiliary agent comprises a film-forming auxiliary agent, a delustering agent, a dispersing agent and a thickening agent, wherein the mass ratio of the film-forming auxiliary agent to the delustering agent to the dispersing agent to the thickening agent is 10:2-3:12-15: 6-8; the film-forming assistant is a compound of dodecyl glycol ester and dipropylene glycol butyl ether, and the mass ratio of the dodecyl glycol ester to the dipropylene glycol butyl ether is 1: 1; the flatting agent is modified polyester acrylate; the dispersing agent is one or more of hydrophobic modified carboxylic acid sodium salt, polyacrylic acid sodium salt or ammonium salt; the thickener is one or more of diatomite, sodium bentonite, polyurethane, polyvinyl alcohol or polyacrylamide.
Further, the reinforcing filler is a compound of rutile titanium dioxide and silicon carbide mixed according to the mass ratio of 10: 7-8.
Further, the modified aerogel is prepared by the following method:
s1, mixing and stirring ethyl orthosilicate, deionized water and ethanol uniformly according to a ratio, then adding a dilute hydrochloric acid solution, adjusting the pH value of the mixed solution to 2-4, stirring at 200r/min for reaction for 6-7h, then adding a dilute ammonia solution to adjust the pH value of the mixed solution to 6-7, stirring uniformly, sealing and standing to form gel;
s2, adding an ethanol water solution into the wet gel, sealing, standing in an electrothermal blowing dry box at 50 ℃ for aging for 24h, exchanging with anhydrous ethanol for 3-4 times, and then exchanging with dichloromethane for 3-4 times at 50 ℃;
and S3, raising the temperature of the exchanged gel to 65-70 ℃, adding stearoyl chloride/dichloromethane solution, stirring for reaction for 4-5h, performing suction filtration, washing with dichloromethane and absolute ethyl alcohol for 3-4 times respectively, and finally drying in a 50 ℃ forced air drying oven for 22-24h to obtain the modified aerogel.
Further, the molar ratio of the ethyl orthosilicate, the deionized water and the ethanol in the step S1 is 1:4: 8.
Further, the ethanol aqueous solution in step S2 has a volume fraction of 50% and is added in an amount of 0.8 to 1 times the volume of the wet gel.
Further, in the step S3, the mass fraction of the stearoyl chloride in the stearoyl chloride/dichloromethane solution is 20%, and the mass ratio of the stearoyl chloride to the ethyl orthosilicate is 3: 2.
A preparation method of a heat insulation coating for building exterior walls comprises the following steps:
and sequentially adding the silicone-acrylic emulsion, the modified aerogel, the floating beads, the reinforcing filler, the mirabilite and the auxiliary agent into a reaction kettle in proportion, stirring for 40-50min at 300r/min, then grinding for 10-12min by a high-speed dispersion grinder, and then stirring for 25-30min at 3000r/min to obtain the heat-insulating and heat-preserving coating.
The invention has the beneficial effects that:
the invention adds the reinforcing filler into the raw material of the coating, wherein the reinforcing filler is a compound of rutile type titanium dioxide and silicon carbide, and the rutile type titanium dioxide has the function of strong refraction and high near-infrared reflectivity2And high infrared emissivity silicon carbide, rutile TiO2The silicon carbide has high infrared reflectivity in a near infrared section, can reflect a part of heat, has high infrared radiance, can emit a part of heat back in a radiation mode, and has the heat preservation and insulation effects by the cooperation of the silicon carbide and the silicon carbide;
according to the coating raw material, the modified aerogel is adopted, the silicon dioxide aerogel is modified through stearoyl chloride, acyl chloride groups on stearoyl chloride molecules and-OH on the surface of the silicon dioxide aerogel are subjected to substitution reaction, the stearoyl chloride molecules are grafted on the surface of the silicon dioxide aerogel, after modification through the stearoyl chloride, on one hand, the-OH number on the surface of the silicon dioxide aerogel can be reduced, the surface of the silicon dioxide aerogel becomes hydrophobic, and the hydrogen bond acting force can be weakened due to the reduction of the-OH number, so that the agglomeration phenomenon of the silicon dioxide aerogel is weakened; on the other hand, the long carbon chains are introduced to the surface of the silicon dioxide aerogel, so that the compatibility of the silicon dioxide aerogel and the polymer matrix can be improved, and the uniform dispersion of the aerogel in the coating is promoted;
according to the invention, the modified aerogel is added into the coating, and the surface of the modified silicon dioxide aerogel can be grafted with long-chain alkyl, so that the uniform dispersion of the aerogel in the coating is promoted, and the micro-porosity in the coating can be greatly improved and the heat conduction path can be prolonged by adding the aerogel, so that the heat preservation and insulation performance of the coating is improved; in addition, materials capable of reflecting radiant heat (rutile titanium dioxide and silicon carbide) are introduced to block a propagation path of radiant heat conduction, and a phase change energy storage material (mirabilite) is used as a high-efficiency storage substance of heat energy, so that the overall performance of the heat insulation coating can be effectively improved by introducing the phase change energy storage material into the coating; the coating has excellent heat preservation and heat insulation performance by starting from three paths (conduction, radiation and convection) of heat transfer.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A heat insulation coating for building exterior walls is prepared from the following raw materials in parts by weight: 50-60 parts of silicone-acrylic emulsion, 18-22 parts of modified aerogel, 7-9 parts of floating beads, 3-4 parts of reinforcing filler, 2-3 parts of mirabilite and 0.6-1 part of auxiliary agent;
the auxiliary agent comprises a film-forming auxiliary agent, a delustering agent, a dispersing agent and a thickening agent, wherein the mass ratio of the film-forming auxiliary agent to the delustering agent to the dispersing agent to the thickening agent is 10:2-3:12-15: 6-8;
the film-forming assistant is a compound of dodecyl glycol ester and dipropylene glycol butyl ether, and the mass ratio of the dodecyl glycol ester to the dipropylene glycol butyl ether is 1: 1; the flatting agent is modified polyester acrylate; the dispersing agent is one or more of hydrophobic modified carboxylic acid sodium salt, polyacrylic acid sodium salt or ammonium salt; the thickening agent is one or more of diatomite, sodium bentonite, polyurethane, polyvinyl alcohol or polyacrylamide;
the reinforcing filler is a compound of rutile titanium dioxide and silicon carbide mixed according to the mass ratio of 10:7-8, wherein the rutile titanium dioxide has the function of strong refraction and rutile TiO with high near-infrared reflectivity2And high infrared emissivity silicon carbide, rutile TiO2The silicon carbide has high infrared reflectivity in a near infrared section, can reflect a part of heat, has high infrared radiance, can emit a part of heat back in a radiation mode, and has the heat preservation and insulation effects by the cooperation of the silicon carbide and the silicon carbide;
the modified aerogel is prepared by the following method:
s1, mixing and stirring ethyl orthosilicate, deionized water and ethanol uniformly according to a ratio, then adding a dilute hydrochloric acid solution (mass fraction of 15%), adjusting the pH value of the mixed solution to 2-4, stirring and reacting at 200r/min for 6-7h, then adding a dilute ammonia solution (mass fraction of 12%) to adjust the pH value of the mixed solution to 6-7, stirring uniformly, sealing and standing to form gel;
wherein the molar ratio of the ethyl orthosilicate to the deionized water to the ethanol is 1:4: 8;
s2, adding an ethanol aqueous solution (the volume fraction of the ethanol aqueous solution is 50%, and the addition amount is 0.8-1 times of the volume of the wet gel), sealing, standing in an electrothermal blowing dry box at 50 ℃ for aging for 24h, exchanging with anhydrous ethanol for 3-4 times (exchanging out water), and then exchanging with dichloromethane for 3-4 times (exchanging out ethanol) at 50 ℃;
s3, heating the temperature of the gel after exchange to 65-70 ℃, adding stearoyl chloride/dichloromethane solution (the mass fraction of stearoyl chloride in the stearoyl chloride/dichloromethane solution is 20%), stirring for reaction for 4-5h, performing suction filtration, washing with dichloromethane and absolute ethyl alcohol for 3-4 times respectively, and finally drying in a 50 ℃ forced air drying oven for 22-24h to obtain the modified aerogel;
wherein the mass ratio of the adding amount of the stearoyl chloride to the tetraethoxysilane is 3: 2;
acyl chloride groups on stearoyl chloride molecules and-OH on the surface of the silicon dioxide aerogel generate substitution reaction, so that the stearoyl chloride molecules are grafted on the surface of the silicon dioxide aerogel, and after modification by the stearoyl chloride, on one hand, the-OH number on the surface of the silicon dioxide aerogel can be reduced, so that the surface of the silicon dioxide aerogel becomes hydrophobic, and the hydrogen bond acting force can be weakened by reducing the-OH number, and further the agglomeration phenomenon of the silicon dioxide aerogel is weakened; on the other hand, the long carbon chains are introduced to the surface of the silicon dioxide aerogel, so that the compatibility of the silicon dioxide aerogel and the polymer matrix can be improved, and the uniform dispersion of the aerogel in the coating is promoted;
the micro-porosity in the coating can be greatly improved and the heat conduction path can be prolonged by adding the aerogel, so that the heat preservation and insulation performance of the coating is improved; in addition, materials capable of reflecting radiant heat (rutile titanium dioxide and silicon carbide) are introduced to block a propagation path of radiant heat conduction, and a phase change energy storage material (mirabilite) is used as a high-efficiency storage substance of heat energy, so that the overall performance of the heat insulation coating can be effectively improved by introducing the phase change energy storage material into the coating; the coating has excellent heat preservation and heat insulation performance by starting from three paths (conduction, radiation and convection) of heat transfer;
the preparation method of the coating comprises the following steps:
and sequentially adding the silicone-acrylic emulsion, the modified aerogel, the floating beads, the reinforcing filler, the mirabilite and the auxiliary agent into a reaction kettle in proportion, stirring for 40-50min at 300r/min, then grinding for 10-12min by a high-speed dispersion grinder, and then stirring for 25-30min at 3000r/min to obtain the heat-insulating and heat-preserving coating.
Example 1
A heat insulation coating for building exterior walls is prepared from the following raw materials in parts by weight: 50 parts of silicone-acrylic emulsion, 18 parts of modified aerogel, 7 parts of floating beads, 3 parts of reinforcing filler, 2 parts of mirabilite and 0.6 part of auxiliary agent;
the heat insulation coating is prepared by the following steps:
and sequentially adding the silicone-acrylic emulsion, the modified aerogel, the floating beads, the reinforcing filler, the mirabilite and the auxiliary agent into the reaction kettle in proportion, stirring for 40min at 300r/min, then grinding for 10min by using a high-speed dispersion grinder, and stirring for 25min at 3000r/min to obtain the heat-insulating and heat-preserving coating.
Example 2
A heat insulation coating for building exterior walls is prepared from the following raw materials in parts by weight: 55 parts of silicone-acrylic emulsion, 20 parts of modified aerogel, 8 parts of floating beads, 3.5 parts of reinforcing filler, 2.5 parts of mirabilite and 0.8 part of auxiliary agent;
the heat insulation coating is prepared by the following steps:
and sequentially adding the silicone-acrylic emulsion, the modified aerogel, the floating beads, the reinforcing filler, the mirabilite and the auxiliary agent into the reaction kettle in proportion, stirring for 45min at 300r/min, grinding for 11min by using a high-speed dispersion grinder, and stirring for 28min at 3000r/min to obtain the heat-insulating and heat-preserving coating.
Example 3
A heat insulation coating for building exterior walls is prepared from the following raw materials in parts by weight: 60 parts of silicone-acrylic emulsion, 22 parts of modified aerogel, 9 parts of floating beads, 4 parts of reinforcing filler, 3 parts of mirabilite and 1 part of auxiliary agent;
the heat insulation coating is prepared by the following steps:
and sequentially adding the silicone-acrylic emulsion, the modified aerogel, the floating beads, the reinforcing filler, the mirabilite and the auxiliary agent into a reaction kettle in proportion, stirring for 50min at 300r/min, then grinding for 12min by a high-speed dispersion grinder, and stirring for 30min at 3000r/min to obtain the heat-insulating and heat-preserving coating.
Comparative example 1
The modified aerogel obtained in example 1 was replaced with a common silica aerogel, and the remaining raw materials and preparation process were not changed.
Comparative example 2
The reinforcing filler material of example 1 was removed and the remaining materials and preparation were unchanged.
The coatings prepared in examples 1-3 and comparative examples 1-2 were tested for the following properties:
spraying each coating on the surface of an aluminum plate, and drying and curing at 120 ℃ for 10min to obtain each coating;
the hardness of the coating is tested according to GB/T6739-; testing the heat conductivity coefficient and the upper temperature resistance limit of the coating at 25 ℃; the test results are given in the following table:
as can be seen from the above table, the hardness of the coatings prepared in examples 1-3 all reach B level, and the compressive strength is 10.39-10.52MPa, which indicates that the coating prepared by the invention can meet the use requirements on the mechanical properties; the heat conductivity coefficient of the coating prepared in the embodiments 1-3 is 0.035-0.037W/m.K, the upper temperature-resistant limit is 248-252 ℃, which shows that the coating prepared by the invention has lower heat conductivity coefficient and higher temperature-resistant performance, and the coating prepared by the invention has good heat-insulating performance; by combining the comparative example 1, the modified silicon dioxide aerogel can be more uniformly dispersed in the coating, and the heat insulation performance is fully exerted; and by combining the comparative example 2, the reinforced filler not only can play a role in enhancing the mechanical strength of the coating, but also can play a synergistic effect with the modified aerogel, so that the heat insulation performance of the coating is further improved.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (8)
1. The heat insulation coating for the building outer wall is characterized by being prepared from the following raw materials in parts by weight: 50-60 parts of silicone-acrylic emulsion, 18-22 parts of modified aerogel, 7-9 parts of floating beads, 3-4 parts of reinforcing filler, 2-3 parts of mirabilite and 0.6-1 part of auxiliary agent;
the heat insulation coating is prepared by the following steps:
and sequentially adding the silicone-acrylic emulsion, the modified aerogel, the floating beads, the reinforcing filler, the mirabilite and the auxiliary agent into a reaction kettle in proportion, stirring for 40-50min at 300r/min, then grinding for 10-12min by a high-speed dispersion grinder, and then stirring for 25-30min at 3000r/min to obtain the heat-insulating and heat-preserving coating.
2. The heat-insulating and heat-preserving coating for the building outer wall as claimed in claim 1, wherein the auxiliary comprises a film-forming auxiliary, a matting agent, a dispersing agent and a thickening agent, and the mass ratio of the film-forming auxiliary, the matting agent, the dispersing agent and the thickening agent is 10:2-3:12-15: 6-8; the film-forming assistant is a compound of dodecyl glycol ester and dipropylene glycol butyl ether, and the mass ratio of the dodecyl glycol ester to the dipropylene glycol butyl ether is 1: 1; the flatting agent is modified polyester acrylate; the dispersing agent is one or more of hydrophobic modified carboxylic acid sodium salt, polyacrylic acid sodium salt or ammonium salt; the thickener is one or more of diatomite, sodium bentonite, polyurethane, polyvinyl alcohol or polyacrylamide.
3. The heat-insulating and heat-preserving coating for the exterior wall of the building as claimed in claim 1, wherein the reinforcing filler is a compound of rutile titanium dioxide and silicon carbide mixed according to a mass ratio of 10: 7-8.
4. The thermal insulation coating for the external wall of the building as claimed in claim 1, wherein the modified aerogel is prepared by the following method:
s1, mixing and stirring ethyl orthosilicate, deionized water and ethanol uniformly according to a ratio, then adding a dilute hydrochloric acid solution, adjusting the pH value of the mixed solution to 2-4, stirring at 200r/min for reaction for 6-7h, then adding a dilute ammonia solution to adjust the pH value of the mixed solution to 6-7, stirring uniformly, sealing and standing to form gel;
s2, adding an ethanol water solution into the wet gel, sealing, standing in an electrothermal blowing dry box at 50 ℃ for aging for 24h, exchanging with anhydrous ethanol for 3-4 times, and then exchanging with dichloromethane for 3-4 times at 50 ℃;
and S3, raising the temperature of the exchanged gel to 65-70 ℃, adding stearoyl chloride/dichloromethane solution, stirring for reaction for 4-5h, performing suction filtration, washing with dichloromethane and absolute ethyl alcohol for 3-4 times respectively, and finally drying in a 50 ℃ forced air drying oven for 22-24h to obtain the modified aerogel.
5. The thermal insulation coating for the exterior wall of the building as claimed in claim 4, wherein the molar ratio of the tetraethoxysilane, the deionized water and the ethanol in the step S1 is 1:4: 8.
6. The thermal insulation coating for the external wall of the building as claimed in claim 4, wherein the volume fraction of the ethanol aqueous solution in the step S2 is 50%, and the addition amount is 0.8-1 times of the volume of the wet gel.
7. The thermal insulation coating for the building outer wall according to claim 4, wherein the mass fraction of the stearoyl chloride in the stearoyl chloride/methylene chloride solution in the step S3 is 20%, and the mass ratio of the addition amount of the stearoyl chloride to the ethyl orthosilicate is 3: 2.
8. The preparation method of the heat insulation coating for the building outer wall according to claim 1, characterized by comprising the following steps:
and sequentially adding the silicone-acrylic emulsion, the modified aerogel, the floating beads, the reinforcing filler, the mirabilite and the auxiliary agent into a reaction kettle in proportion, stirring for 40-50min at 300r/min, then grinding for 10-12min by a high-speed dispersion grinder, and then stirring for 25-30min at 3000r/min to obtain the heat-insulating and heat-preserving coating.
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| CN113372776A (en) * | 2021-06-21 | 2021-09-10 | 江苏脒诺甫纳米材料有限公司 | Building sun-proof heat-insulating coating and preparation method thereof |
| CN114456659A (en) * | 2022-02-22 | 2022-05-10 | 白稀坤域能源科技(成都)有限公司 | Solar heat reflection heat insulation coating and preparation method thereof |
| CN114874671A (en) * | 2022-05-10 | 2022-08-09 | 湖北襄涂建筑综合服务有限公司 | Heat-insulation and heat-preservation emulsion for stone-like paint and preparation method thereof |
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| CN113372776B (en) * | 2021-06-21 | 2022-02-25 | 江苏脒诺甫纳米材料有限公司 | Building sun-proof heat-insulating coating and preparation method thereof |
| CN114456659A (en) * | 2022-02-22 | 2022-05-10 | 白稀坤域能源科技(成都)有限公司 | Solar heat reflection heat insulation coating and preparation method thereof |
| CN114456659B (en) * | 2022-02-22 | 2023-04-28 | 广东筑龙涂料有限公司 | Solar heat reflection heat insulation coating and preparation method thereof |
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Application publication date: 20201027 |