1. The heat-insulating coating applied to the building outer wall is characterized by comprising the following raw materials: the coating comprises fluorine-silicon modified acrylate emulsion, styrene-acrylate emulsion, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, sodium hydroxymethyl cellulose, nonylphenol polyoxyethylene ether, functional filler, 3-diaminodiphenyl sulfone, polytrifluoropropylmethylsiloxane, methyl silsesquioxane, montmorillonite, nano titanium carbide and water.

2. The heat-insulating coating applied to the building outer wall is characterized by comprising the following raw materials: the coating comprises fluorine-silicon modified acrylate emulsion, styrene-acrylate emulsion, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, sodium hydroxymethyl cellulose, nonylphenol polyoxyethylene ether, functional filler, 3-diaminodiphenyl sulfone, polytrifluoropropylmethylsiloxane, methyl silsesquioxane, montmorillonite, polyimide microspheres, nano titanium carbide and water.

3. The heat-insulating coating applied to the building exterior wall is characterized by comprising the following raw materials in parts by weight: 100 parts of fluorine-silicon modified acrylate emulsion, 10-20 parts of styrene-acrylate emulsion, 8-12 parts of 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, 1-5 parts of sodium hydroxymethyl cellulose, 1-3 parts of nonylphenol polyoxyethylene ether, 15-25 parts of functional filler, 1-5 parts of 3, 3-diaminodiphenyl sulfone, 1-3 parts of polytrifluoropropylmethylsiloxane, 0.5-2 parts of methyl silsesquioxane, 3-8 parts of montmorillonite, 5-15 parts of polyimide microspheres, 5-12 parts of nano titanium carbide and 40-60 parts of water.

4. The heat-insulating coating applied to the external wall of the building as claimed in claim 1, 2 or 3, wherein the functional filler is one or a mixture of two or more of silica aerogel, activated carbon, modified silica aerogel and modified activated carbon.

5. The thermal insulation coating applied to the external wall of the building as claimed in claim 4, wherein the preparation method of the modified silica aerogel comprises the following steps: drying and crushing the silicon dioxide aerogel to obtain silicon dioxide aerogel powder; adding the silicon dioxide aerogel powder and the silane coupling agent into an ethanol water solution, uniformly mixing, performing ultrasonic treatment, centrifuging, taking the precipitate, and drying to obtain the modified silicon dioxide aerogel.

6. The heat-insulating coating applied to the outer wall of the building as claimed in claim 4, wherein the preparation method of the modified activated carbon comprises the following steps:

(1) adding activated carbon into water for ultrasonic treatment to obtain an activated carbon suspension;

(2) ZrOCl₂·8H₂Adding O into the activated carbon suspension obtained in the step (1) for ultrasonic treatment to obtain a mixed material; adjusting the pH value of the mixed material by adopting ammonia water, placing the mixed material in a reaction kettle for heating reaction, centrifuging to take precipitate after the reaction is finished, and drying to obtain pretreated activated carbon;

(3) adding Bi₂O₃、Y₂O₃Adding the pretreated activated carbon obtained in the step (2) into a mortar for grinding to obtain mixed powder; and drying the mixed powder, heating the dried mixed powder for reaction, and cooling to room temperature to obtain the modified activated carbon.

7. The heat-insulating coating applied to the outer wall of the building as claimed in claim 4, wherein the preparation method of the modified activated carbon comprises the following steps:

(1) adding activated carbon into water, and performing ultrasonic treatment for 20-30min, wherein the ultrasonic power is 800-1000W, and the ultrasonic frequency is 20-25kHz, so as to obtain an activated carbon suspension, and the mass ratio of the activated carbon to the water is 80: (100-);

(2) ZrOCl₂·8H₂Adding O into the activated carbon suspension obtained in the step (1) for ultrasonic treatment for 20-30min, wherein the ultrasonic power is 800-1000W, and the ultrasonic frequency is 20-25kHz, so as to obtain a mixed material; adjusting the pH value of the mixed material to 9-9.5 by using 8-10 wt% of ammonia water, stirring for 3-4h at 400r/min of 200-₂·8H₂The mass ratio of the O to the active carbon is (3-5): 80;

(3) adding Bi₂O₃、Y₂O₃Adding the pretreated activated carbon obtained in the step (2) into a mortar for grinding to obtain mixed powder; drying the mixed powder, heating the dried mixed powder to 800-₂O₃、Y₂O₃The mass ratio of the pretreated activated carbon is 1: 1: (1-5).

8. The heat-insulating coating applied to the outer wall of the building as claimed in claim 5, wherein the silane coupling agent is one or two of (3- (2-aminoethylamino) propyltrimethoxysilane and 1H,1H,2H, 2H-perfluorooctyltriethoxysilane.

9. The preparation method of the heat-insulating coating applied to the outer wall of the building as claimed in any one of claims 1 to 8, characterized by comprising the following steps:

adding nonylphenol polyoxyethylene ether, sodium carboxymethylcellulose and methyl silsesquioxane into water, mixing, and stirring at 400r/min for 30-40min at 200-; adding the fluorosilicone modified acrylate emulsion and the styrene-acrylate emulsion into the mixture I, and stirring for 30-40min at the speed of 200-400r/min to obtain a mixture II; adding the functional filler, the nano titanium carbide, the montmorillonite and the polyimide microspheres into the mixture II, and stirring for 30-40min at the speed of 200-400r/min to obtain a mixture III; adding 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, 3-diaminodiphenyl sulfone and poly (trifluoropropylmethyl siloxane) into the mixture III, and stirring at the speed of 200-.

Background

The coating is coated on the surface of the decorated object, can form a firm, compact and complete coating film with the decorated object, and has the functions of decoration and beautification as well as protection. With the rapid development of science and technology, the requirement on the coating is higher and higher, so that the coating has multiple functions to meet the social requirements.

In the seasons of hot summer and cold winter, the temperature of objects on the outer surface of the building is increased or decreased along with the increase of the temperature or the decrease of the temperature, so that the temperature inside the objects is increased or decreased, the life quality of people is seriously affected, and meanwhile, due to the weather, devices such as air conditioners, refrigerators and the like are used in large quantities, and the serious environmental problem of global warming is further caused. In recent years, coatings with multiple functions have received attention from researchers. The external wall heat-insulating coating is one of the external wall heat-insulating coatings, and a layer of coating with solar reflection heat insulation is coated on the external wall of a building, so that the external wall heat-insulating coating can play a certain role in cooling and heat insulation, improve the internal temperature of an object and reduce energy consumption, and is widely applied to the fields of external walls of buildings, automobile shells, external walls of oil tanks, aerospace and the like. The heat-insulating coating is divided into a barrier type heat-insulating coating, a reflection type heat-insulating coating and a radiation type heat-insulating coating; the heat-insulating coating with a single mechanism cannot meet the requirement of building energy conservation in hot summer, cold winter and cold regions, and meanwhile, the phenomena of fading, cracking and the like appear soon after some coatings are coated on walls, so that the appearance of a coating film is seriously influenced.

Chinese patent CN104403390A discloses a heat insulation coating, which comprises the following components in percentage by weight: waterborne acrylic acid, propylene glycol, epoxy resin, methyl methacrylate, heavy calcium carbonate, diatomite, plant cellulose and a curing agent; through the mode, the heat insulation coating disclosed by the invention has the advantages that the prepared heat insulation coating has better heat insulation performance after construction, is not easy to crack under the working condition with large temperature difference, and is strong in stain resistance. But the heat preservation and insulation effect is not ideal, and meanwhile, the appearance is not attractive under the condition of large temperature difference, and the adhesive force and the water resistance are not improved.

Disclosure of Invention

In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a thermal insulation coating applied to the exterior wall of a building.

A heat-insulating coating applied to building exterior walls is composed of the following raw materials in parts by weight: 100 parts of fluorine-silicon modified acrylate emulsion, 10-20 parts of styrene-acrylate emulsion, 8-12 parts of 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, 1-5 parts of sodium hydroxymethyl cellulose, 1-3 parts of nonylphenol polyoxyethylene ether, 15-25 parts of functional filler, 1-5 parts of 3, 3-diaminodiphenyl sulfone, 1-3 parts of polytrifluoropropylmethylsiloxane, 0.5-2 parts of methyl silsesquioxane, 3-8 parts of montmorillonite, 5-12 parts of nano titanium carbide and 40-60 parts of water.

The fluorine-silicon modified acrylate emulsion is used as a substrate, so that the heat-insulating coating applied to the building outer wall has good performances of weather resistance, stain resistance, wear resistance and the like, and simultaneously forms good hydrophobic performance.

2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate is used as a film forming agent, so that the plastic flow and the elastic shape of the coating can be promoted, the coalescence performance is improved, and meanwhile, the compactness of the coating can be improved.

The montmorillonite has low heat conductivity coefficient and heat preservation effect, and simultaneously has a layered structure, so that the energy transfer speed and path are reduced in the energy transfer process, and good heat insulation and heat preservation effects are achieved. The nano titanium carbide has extremely low heat conductivity coefficient, effectively inhibits and shields infrared radiation heat and heat conduction, and has good reflection performance due to the hollow structure. The methyl silsesquioxane has excellent lubricity, softness and smoothness, and prevents the coating from agglomerating.

Further, the heat-insulating coating applied to the building outer wall is composed of the following raw materials in parts by weight: 100 parts of fluorine-silicon modified acrylate emulsion, 10-20 parts of styrene-acrylate emulsion, 8-12 parts of 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, 1-5 parts of sodium hydroxymethyl cellulose, 1-3 parts of nonylphenol polyoxyethylene ether, 15-25 parts of functional filler, 1-5 parts of 3, 3-diaminodiphenyl sulfone, 1-3 parts of polytrifluoropropylmethylsiloxane, 0.5-2 parts of methyl silsesquioxane, 3-8 parts of montmorillonite, 5-15 parts of polyimide microspheres, 5-12 parts of nano titanium carbide and 40-60 parts of water.

The functional filler is silica aerogel and/or activated carbon.

Preferably, the functional filler is modified silica aerogel and/or activated carbon.

The preparation method of the modified silicon dioxide aerogel comprises the following steps: drying and crushing the silicon dioxide aerogel, and sieving the silicon dioxide aerogel with a sieve of 80-100 meshes to obtain silicon dioxide aerogel powder; adding silicon dioxide aerogel powder and a silane coupling agent into an ethanol aqueous solution, uniformly mixing, carrying out ultrasonic treatment for 1-2h, wherein the ultrasonic power is 800-1000W, the ultrasonic frequency is 20-25kHz, centrifuging, taking precipitate, and drying to obtain the modified silicon dioxide aerogel, wherein the mass ratio of the silicon dioxide aerogel powder to the silane coupling agent to the ethanol aqueous solution is (10-15): (2-4): (60-80); the ethanol water solution is prepared from anhydrous ethanol and water according to the mass ratio (35-50): (15-20) mixing.

The silane coupling agent is one or two of N- (2-aminoethyl) -3-aminopropyltrimethoxysilane and 1H,1H,2H, 2H-perfluorooctyltriethoxysilane.

Preferably, the silane coupling agent is N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, 1H,2H, 2H-perfluorooctyltriethoxysilane according to the mass ratio of (1-3): (1-3).

The silicon dioxide aerogel is a porous structure with a net structure, contains a plurality of gaps, has a reduced heat conductivity coefficient, and has good heat resistance performance on a coating. The preparation method comprises the following steps of modifying silicon dioxide aerogel by adopting N- (2-aminoethyl) -3-aminopropyltrimethoxysilane and 1H,1H,2H, 2H-perfluorooctyltriethoxysilane, wherein the modified silicon dioxide aerogel contains hydroxyl, wraps the surface of a polyimide microsphere through the action of hydrogen bonds with the polyimide microsphere under the action of emulsion, fills pores of the polyimide microsphere, constructs a multi-layer structure, blocks heat, reflects heat and has good heat insulation performance; on the other hand, 1H,2H, 2H-perfluorooctyltriethoxysilane is adopted to modify the silicon dioxide aerogel, so that the surface energy of the coating is reduced, the hydrophobicity of the coating is improved, and the compatibility with other substances is further improved.

Further, the functional filler is modified silicon dioxide aerogel and modified activated carbon according to the mass ratio of (1-3): (1-3) mixing.

The preparation method of the modified activated carbon comprises the following steps:

(1) adding activated carbon into water, and performing ultrasonic treatment for 20-30min, wherein the ultrasonic power is 800-1000W, and the ultrasonic frequency is 20-25kHz, so as to obtain an activated carbon suspension, and the mass ratio of the activated carbon to the water is 80: (100-);

(2) ZrOCl₂·8H₂Adding O into the activated carbon suspension obtained in the step (1) for ultrasonic treatment for 20-30min, wherein the ultrasonic power is 800-1000W, and the ultrasonic frequency is 20-25kHz, so as to obtain a mixed material; adjusting the pH value of the mixed material to 9-9.5 by using 8-10 wt% of ammonia water, stirring for 3-4h at 400r/min of 200-₂·8H₂The mass ratio of the O to the active carbon is (3-5): 80;

(3) adding Bi₂O₃、Y₂O₃Adding the pretreated activated carbon obtained in the step (2) into a mortar for grinding to obtain mixed powder; drying the mixed powder, heating the dried mixed powder to 800-₂O₃、Y₂O₃The mass ratio of the pretreated activated carbon is 1: 1: (1-5).

ZrOCl₂·8H₂Loading O solution in pores of the activated carbon, calcining at high temperature to obtain the zirconia modified activated carbon, and simultaneously adopting Bi₂O₃、Y₂O₃Modifying the zirconia modified activated carbon to obtain a modified activated carbon, emitting solar energy into the air by the chromium oxide in a radiation form, and Bi₃YO₆Having near-infrared reflection properties, chromium oxide and Bi₃YO₆The synergistic effect has good heat preservation and insulation effects, and the activated carbon is uniformly dispersed.

A preparation method of a heat-insulating coating applied to an external wall of a building comprises the following steps: adding nonylphenol polyoxyethylene ether, sodium carboxymethylcellulose and methyl silsesquioxane into water, mixing, and stirring at 400r/min for 30-40min at 200-; adding the fluorosilicone modified acrylate emulsion and the styrene-acrylate emulsion into the mixture I, and stirring for 30-40min at the speed of 200-400r/min to obtain a mixture II; adding the functional filler, the nano titanium carbide, the montmorillonite and the polyimide microspheres into the mixture II, and stirring for 30-40min at the speed of 200-400r/min to obtain a mixture III; adding 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, 3-diaminodiphenyl sulfone and poly (trifluoropropylmethyl siloxane) into the mixture III, and stirring at the speed of 200-.

The invention has the beneficial effects that: the invention adopts the fluorine-silicon modified acrylate emulsion as the substrate, so that the heat-insulating coating applied to the building outer wall has good performances of weather resistance, stain resistance, wear resistance and the like, and simultaneously forms good hydrophobic performance. Adopts silica aerogel, montmorillonite, nano titanium carbide, chromium oxide and Bi₃YO₆The coating has good heat preservation and heat insulation performance by adopting the modes of obstruction, reflection and radiation. The raw materials in the invention have synergistic effect, so that the heat insulation performance of the exterior wall for the building is improved, and meanwhile, the paint has good adhesive force and water resistance, the cracking problem caused by long-term use of the paint is effectively reduced, and the service life of the paint is prolonged. The heat-insulating coating prepared by the invention has the advantages of simple construction, high safety and strong decoration.

Detailed Description

The invention is further illustrated below with reference to specific examples. It is to be understood, however, that these examples are illustrative only and are not to be construed as limiting the scope of the present invention. Test methods in which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under conditions recommended by the manufacturer.

In the examples, the fluorosilicone modified acrylate emulsion is prepared according to patent 201210013514.1, example 1.

The styrene-acrylate emulsion has the solid content of 40-50%, the viscosity of 80-2000 mPa · s, the monomer residual quantity of 0.5%, the pH value of 8-9, and Shenzhen Shenchun chemical Limited.

2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, CAS: 25265-77-4, bead trades, Inc. of Tokyo, Nanjing.

Nonylphenol polyoxyethylene ether, CAS: 20427-84-3, purity: 98%, Shanghai-derived leaf Biotech, Inc.

3, 3-diaminodiphenyl sulfone, CAS: 599-61-1, Shanghai-derived leaf Biotech, Inc.

Polytrifluoropropylmethylsiloxane, Mw 4600, CAS: 63148-56-1, Hebei Hengjing chemical Co., Ltd.

Methylsilsesquioxane, CAS: 68554-70-1, particle size: 3-4 μm, Guangzhou Patai chemical Co., Ltd.

Montmorillonite, particle size: 0.1-1 μm, Wuhan Carnous technologies, Inc.

The polyimide microspheres in the examples are prepared according to example 3 in Chinese patent 201610247480.0.

Nano titanium carbide, particle size: 40nm, last-sea workup new material technology limited.

N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, CAS: 1760-24-3, ferry chemical company, Hubei.

1H,1H,2H, 2H-perfluorooctyltriethoxysilane, CAS: 51851-37-7, Kyobrocade science and technology development Co., Ltd.

The silicon dioxide aerogel has a microscopic particle size of 40-60 nm, a macroscopic particle size of 50 um-5 mm and a porosity of 90-98%.

Activated carbon, particle size 400 mesh, Guangzhou Tianjin chemical Co., Ltd.

Example 1

A heat-insulating coating applied to building exterior walls is composed of the following raw materials in parts by weight: 100 parts of fluorine-silicon modified acrylate emulsion, 15 parts of styrene-acrylate emulsion, 10 parts of 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, 3 parts of sodium hydroxymethyl cellulose, 2 parts of nonylphenol polyoxyethylene ether, 20 parts of functional filler, 2 parts of 3, 3-diaminodiphenyl sulfone, 1.5 parts of polytrifluoropropylmethylsiloxane, 0.5 part of methyl silsesquioxane, 5 parts of montmorillonite, 10 parts of polyimide microspheres, 8 parts of nano titanium carbide and 40 parts of water.

The functional filler is formed by mixing silicon dioxide aerogel and activated carbon according to a mass ratio of 2: 1.

The preparation method of the heat-insulating coating applied to the building outer wall comprises the following steps:

adding nonylphenol polyoxyethylene ether, sodium carboxymethylcellulose and methyl silsesquioxane into water, mixing, and stirring at 300r/min for 35min to obtain a mixture I; adding the fluorosilicone modified acrylate emulsion and the styrene-acrylate emulsion into the mixture I, and stirring at 300r/min for 35min to obtain a mixture II; adding the functional filler, the nano titanium carbide, the montmorillonite and the polyimide microspheres into the mixture II, and stirring at 300r/min for 35min to obtain a mixture III; adding 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, 3-diaminodiphenyl sulfone and poly (trifluoropropylmethyl siloxane) into the mixture III, and stirring at 300r/min for 12min to obtain the heat-insulating coating applied to the building exterior wall.

Comparative example 1

Essentially the same as example 1, except that: the functional filler is silicon dioxide aerogel.

Example 2

A heat-insulating coating applied to building exterior walls is composed of the following raw materials in parts by weight: 100 parts of fluorine-silicon modified acrylate emulsion, 15 parts of styrene-acrylate emulsion, 10 parts of 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, 3 parts of sodium hydroxymethyl cellulose, 2 parts of nonylphenol polyoxyethylene ether, 20 parts of functional filler, 2 parts of 3, 3-diaminodiphenyl sulfone, 1.5 parts of polytrifluoropropylmethylsiloxane, 0.5 part of methyl silsesquioxane, 5 parts of montmorillonite, 10 parts of polyimide microspheres, 8 parts of nano titanium carbide and 40 parts of water.

The functional filler is prepared by mixing modified silicon dioxide aerogel and activated carbon according to a mass ratio of 2: 1. The preparation method of the modified silicon dioxide aerogel comprises the following steps: drying, crushing and screening the silicon dioxide aerogel with a 100-mesh sieve to obtain silicon dioxide aerogel powder; adding silicon dioxide aerogel powder and a silane coupling agent into an ethanol water solution, uniformly mixing, performing ultrasonic treatment for 2 hours, wherein the ultrasonic power is 800W, the ultrasonic frequency is 20kHz, centrifuging, taking precipitate, and drying to obtain modified silicon dioxide aerogel, wherein the mass ratio of the silicon dioxide aerogel powder to the silane coupling agent to the ethanol water solution is 15: 2: 60, adding a solvent to the mixture; the ethanol aqueous solution is prepared from absolute ethanol and water according to a mass ratio of 40: 18 are mixed.

The silane coupling agent is N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, 1H,2H, 2H-perfluorooctyltriethoxysilane in a mass ratio of 1: 1.

The preparation method of the heat-insulating coating applied to the building outer wall comprises the following steps: adding nonylphenol polyoxyethylene ether, sodium carboxymethylcellulose and methyl silsesquioxane into water, mixing, and stirring at 300r/min for 35min to obtain a mixture I; adding the fluorosilicone modified acrylate emulsion and the styrene-acrylate emulsion into the mixture I, and stirring at 300r/min for 35min to obtain a mixture II; adding the functional filler, the nano titanium carbide, the montmorillonite and the polyimide microspheres into the mixture II, and stirring at 300r/min for 35min to obtain a mixture III; adding 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, 3-diaminodiphenyl sulfone and poly (trifluoropropylmethyl siloxane) into the mixture III, and stirring at 300r/min for 12min to obtain the heat-insulating coating applied to the building exterior wall.

Example 3

Essentially the same as example 2, except that:

the preparation method of the modified silicon dioxide aerogel comprises the following steps: drying, crushing and screening the silicon dioxide aerogel with a 100-mesh sieve to obtain silicon dioxide aerogel powder; adding silicon dioxide aerogel powder and a silane coupling agent into an ethanol water solution, uniformly mixing, performing ultrasonic treatment for 2 hours, wherein the ultrasonic power is 800W, the ultrasonic frequency is 20kHz, centrifuging, taking precipitate, and drying to obtain modified silicon dioxide aerogel, wherein the mass ratio of the silicon dioxide aerogel powder to the silane coupling agent to the ethanol water solution is 15: 2: 60, adding a solvent to the mixture; the ethanol aqueous solution is prepared from absolute ethanol and water according to a mass ratio of 40: 18 are mixed. The silane coupling agent is N- (2-aminoethyl) -3-aminopropyltrimethoxysilane.

Example 4

Essentially the same as example 2, except that:

the preparation method of the modified silicon dioxide aerogel comprises the following steps: drying, crushing and screening the silicon dioxide aerogel with a 100-mesh sieve to obtain silicon dioxide aerogel powder; adding silicon dioxide aerogel powder and a silane coupling agent into an ethanol water solution, uniformly mixing, performing ultrasonic treatment for 2 hours, wherein the ultrasonic power is 800W, the ultrasonic frequency is 20kHz, centrifuging, taking precipitate, and drying to obtain modified silicon dioxide aerogel, wherein the mass ratio of the silicon dioxide aerogel powder to the silane coupling agent to the ethanol water solution is 15: 2: 60, adding a solvent to the mixture; the ethanol aqueous solution is prepared from absolute ethanol and water according to a mass ratio of 40: 18 are mixed. The silane coupling agent is 1H,1H,2H, 2H-perfluorooctyl triethoxysilane.

Example 5

A heat-insulating coating applied to building exterior walls is composed of the following raw materials in parts by weight: 100 parts of fluorine-silicon modified acrylate emulsion, 15 parts of styrene-acrylate emulsion, 10 parts of 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, 3 parts of sodium hydroxymethyl cellulose, 2 parts of nonylphenol polyoxyethylene ether, 20 parts of functional filler, 2 parts of 3, 3-diaminodiphenyl sulfone, 1.5 parts of polytrifluoropropylmethylsiloxane, 0.5 part of methyl silsesquioxane, 5 parts of montmorillonite, 10 parts of polyimide microspheres, 8 parts of nano titanium carbide and 40 parts of water.

The functional filler is prepared by mixing modified silicon dioxide aerogel and modified activated carbon according to the mass ratio of 2: 1.

The preparation method of the modified silicon dioxide aerogel comprises the following steps: drying, crushing and screening the silicon dioxide aerogel with a 100-mesh sieve to obtain silicon dioxide aerogel powder; adding silicon dioxide aerogel powder and a silane coupling agent into an ethanol water solution, uniformly mixing, performing ultrasonic treatment for 2 hours, wherein the ultrasonic power is 800W, the ultrasonic frequency is 20kHz, centrifuging, taking precipitate, and drying to obtain modified silicon dioxide aerogel, wherein the mass ratio of the silicon dioxide aerogel powder to the silane coupling agent to the ethanol water solution is 15: 2: 60, adding a solvent to the mixture; the ethanol aqueous solution is prepared from absolute ethanol and water according to a mass ratio of 40: 18 are mixed.

The silane coupling agent is N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, 1H,2H, 2H-perfluorooctyltriethoxysilane in a mass ratio of 1: 1.

The preparation method of the modified activated carbon comprises the following steps:

(1) adding activated carbon into water, and performing ultrasonic treatment for 30min, wherein the ultrasonic power is 800W, the ultrasonic frequency is 20kHz, so as to obtain an activated carbon suspension, and the mass ratio of the activated carbon to the water is 80: 100, respectively;

(2) ZrOCl₂·8H₂Adding O into the activated carbon suspension obtained in the step (1) for ultrasonic treatment for 30min, wherein the ultrasonic power is 800W, and the ultrasonic frequency is 20kHz, so as to obtain a mixed material; adjusting the pH value of the mixed material to 9.4 by adopting 10 wt% ammonia water, stirring for 4h at 300r/min, then placing the mixed material in a reaction kettle, heating to 200 ℃ for reaction for 14h, centrifuging to obtain precipitate after the reaction is finished, and drying to obtain pretreated activated carbon, wherein ZrOCl₂·8H₂The mass ratio of O to the activated carbon is 5: 80;

(3) adding Bi₂O₃、Y₂O₃Adding the pretreated activated carbon obtained in the step (2) into a mortar for grinding to obtain mixed powder; heating the mixed powder to 800 ℃ for reaction for 2h, and cooling to room temperature to obtain modified activated carbon, wherein the Bi is₂O₃、Y₂O₃The mass ratio of the pretreated activated carbon is 1: 1: 4.

the preparation method of the heat-insulating coating applied to the building outer wall comprises the following steps:

adding nonylphenol polyoxyethylene ether, sodium carboxymethylcellulose and methyl silsesquioxane into water, mixing, and stirring at 300r/min for 35min to obtain a mixture I; adding the fluorosilicone modified acrylate emulsion and the styrene-acrylate emulsion into the mixture I, and stirring at 300r/min for 35min to obtain a mixture II; adding the functional filler, the nano titanium carbide, the montmorillonite and the polyimide microspheres into the mixture II, and stirring at 300r/min for 35min to obtain a mixture III; adding 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, 3-diaminodiphenyl sulfone and poly (trifluoropropylmethyl siloxane) into the mixture III, and stirring at 300r/min for 12min to obtain the heat-insulating coating applied to the building exterior wall.

Example 6

Essentially the same as example 5, except that:

the preparation method of the modified activated carbon comprises the following steps:

(1) adding activated carbon into water, and performing ultrasonic treatment for 30min, wherein the ultrasonic power is 800W, the ultrasonic frequency is 20kHz, so as to obtain an activated carbon suspension, and the mass ratio of the activated carbon to the water is 80: 100, respectively;

(2) ZrOCl₂·8H₂Adding O into the activated carbon suspension obtained in the step (1) for ultrasonic treatment for 30min, wherein the ultrasonic power is 800W, and the ultrasonic frequency is 20kHz, so as to obtain a mixed material; adjusting the pH value of the mixed material to 9.4 by adopting 10 wt% ammonia water, stirring for 4h at 300r/min, then placing the mixed material in a reaction kettle, heating to 200 ℃ for reaction for 14h, centrifuging to obtain precipitate after the reaction is finished, and drying to obtain modified activated carbon, wherein ZrOCl₂·8H₂The mass ratio of O to the activated carbon is 5: 80.

example 7

Essentially the same as example 5, except that:

the preparation method of the modified activated carbon comprises the following steps:

(1) adding activated carbon into water, and performing ultrasonic treatment for 30min, wherein the ultrasonic power is 800W, the ultrasonic frequency is 20kHz, so as to obtain an activated carbon suspension, and the mass ratio of the activated carbon to the water is 80: 100, respectively;

(2) adding Bi₂O₃、Y₂O₃Carrying out ultrasonic treatment on the activated carbon suspension in the step (1) for 30min, wherein the ultrasonic power is 800W and the ultrasonic frequency is 20kHz, centrifuging, taking precipitate, and drying to obtain a mixed material; drying the mixed powder, heating the dried mixed powder to 800 ℃ for reaction for 2h, and cooling to room temperature to obtain modified activated carbon, wherein the Bi is₂O₃、Y₂O₃And the mass ratio of the activated carbon is 1: 1: 4.

test example 1

The thermal conductivity of the thermal insulation coating applied to the exterior wall of the building prepared in examples 1 to 7 and comparative example 1 was tested. The heat conductivity coefficient of the paint film at 25 ℃ is detected by referring to GB/T17371-2008 silicate composite heat-insulating paint.

TABLE 1 Heat conductivity coefficient test results of the thermal insulation coating applied to the building exterior wall

	Thermal conductivity (W/(mK))
		Example 1	0.086
Example 2	0.053
		Example 3	0.059
Example 4	0.084
		Example 5	0.037
Example 6	0.047
		Example 7	0.043
Comparative example 1	0.104

Test example 2

The heat-insulating coating applied to the building outer wall prepared in examples 1 to 7 and comparative example 1 was tested for solar reflectance, hemispherical emissivity, and heat-insulating temperature difference.

The solar reflectance and hemispherical emissivity of the paint film are detected according to JG/T1040-.

1. Testing of solar reflectance:

the test method comprises the following steps: the flat coating type F is adopted for coating, an aluminum alloy plate with the size of 150mm multiplied by 70mm multiplied by 1mm is selected, the number of test plates is 3, the heat-insulating coating applied to the building outer wall is fully stirred and uniformly mixed in a container, a coater or a scraper is used for coating the surface of the aluminum alloy plate in two ways, the thickness of a dry film of the coating is 0.20mm, and the coating is required to be flat and free of defects such as bubbles, cracks and the like. The time interval of the two coating steps is 6 hours, and the curing time is 168 hours.

The procedure for measuring the solar reflectance was tested with respect to the spectroscopic method 1 in appendix A of JG/T1040-2020 Heat reflective insulating paint for exterior surfaces of buildings.

2. Testing hemispherical emissivity:

the test method comprises the following steps: the flat coating type F is adopted for coating, an aluminum alloy plate with the size of 150mm multiplied by 70mm multiplied by 1mm is selected, the number of test plates is 3, the heat-insulating coating applied to the building outer wall is fully stirred and uniformly mixed in a container, a coater or a scraper is used for coating the surface of the aluminum alloy plate in two ways, the thickness of a dry film of the coating is 0.20mm, and the coating is required to be flat and free of defects such as bubbles, cracks and the like. The time interval of the two coating steps is 6 hours, and the curing time is 168 hours.

Testing procedure of hemispherical emissivity JG/T1040-.

Table 2 test results of solar reflectance and hemispherical emissivity of the thermal insulation coating applied to the building exterior wall.

Test example 3

The heat insulation temperature difference test was performed on the heat insulation coatings applied to the exterior walls of the buildings prepared in examples 1 to 7 and comparative example 1.

Reference to the test examples of the thermal insulation temperature difference (SiO)₂Application of aerogels in reflective thermal insulation coatings ", Liweisheng, Master thesis, Shenyang university of construction) was tested for determination of the thermal insulation temperature difference of the coating.

Table 3 test results of the insulation temperature difference of the insulation coating applied to the building exterior wall.

	Insulation temperature difference/. degree.C
		Example 1	8.7
Example 2	10.4
		Example 3	9.8
Example 4	9.2
		Example 5	12.1
Example 6	11.3
		Example 7	11.9
Comparative example 1	8.5

Examples 5-7 comparison shows that example 5 uses ZrOCl₂.8H₂O、Bi₂O₃、Y₂O₃The ZrOCl is used as a raw material to modify the active carbon and is applied to the heat-insulating coating of the building outer wall to obviously improve the heat conductivity coefficient, and the ZrOCl is singly adopted₂.8H₂O or Bi₂O₃And Y₂O₃The modified active carbon also has certain heat preservation and insulation effects, but the two methods obviously improve the heat preservation and insulation performance of the coating, thereby improving the heat conductivity coefficient of the coating. The possible reasons for this are: ZrOCl₂.8H₂Loading O solution in pores of the activated carbon, calcining at high temperature to obtain the zirconia modified activated carbon, and simultaneously adopting Bi₂O₃、Y₂O₃Modifying the zirconia modified activated carbon to obtain a modified activated carbon, emitting solar energy into the air by the chromium oxide in a radiation form, and Bi₃YO₆Having near-infrared reflection properties, chromium oxide and Bi₃YO₆The synergistic effect has good heat preservation and insulation effects, and the activated carbon is uniformly dispersed.

The comparison of the examples 1 to 4 shows that the examples adopt N- (2-aminoethyl) -3-aminopropyltrimethoxysilane and 1H,1H,2H, 2H-perfluorooctyltriethoxysilane to modify the silica aerogel simultaneously, so that the heat preservation and insulation performance of the silica aerogel is remarkably improved, and the silica aerogel has a synergistic effect. The possible reasons for this are: the silicon dioxide aerogel is a porous structure with a net structure, contains a plurality of gaps, has a reduced heat conductivity coefficient, and has good heat resistance performance on a coating. The preparation method comprises the following steps of modifying silicon dioxide aerogel by adopting N- (2-aminoethyl) -3-aminopropyltrimethoxysilane and 1H,1H,2H, 2H-perfluorooctyltriethoxysilane, wherein the modified silicon dioxide aerogel contains hydroxyl, wraps the surface of a polyimide microsphere through the action of hydrogen bonds with the polyimide microsphere under the action of emulsion, fills pores of the polyimide microsphere, constructs a multi-layer structure, blocks heat, reflects heat and has good heat insulation performance; on the other hand, 1H,2H, 2H-perfluorooctyltriethoxysilane is adopted to modify the silicon dioxide aerogel, so that the surface energy of the coating is reduced, the hydrophobicity of the coating is improved, and the compatibility with other substances is further improved.

Comparing example 1 with example 1, it is found that example 1 has good heat preservation and insulation performance, the silica aerogel and the activated carbon interact to enable the particles to protrude outwards, and the activated carbon and the silica aerogel contain porous structures to further block penetration of solar radiation energy and have heat reflection and insulation performance.