CN110982360B - Composite heat-insulating coating for building exterior wall and preparation method thereof - Google Patents

Composite heat-insulating coating for building exterior wall and preparation method thereof Download PDF

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CN110982360B
CN110982360B CN201911157286.3A CN201911157286A CN110982360B CN 110982360 B CN110982360 B CN 110982360B CN 201911157286 A CN201911157286 A CN 201911157286A CN 110982360 B CN110982360 B CN 110982360B
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activated carbon
raw material
defoaming agent
acetic acid
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CN110982360A (en
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冀高平
李忠
李艳
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Beijing Hangyu Shunchang Decoration Engineering Co ltd
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Beijing Hangyu Shunchang Decoration Engineering Co ltd
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    • C09D143/00Coating 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
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    • C08K3/18Oxygen-containing compounds, e.g. metal carbonyls
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    • C08K2003/2241Titanium dioxide
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    • C08L2205/035Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend

Abstract

The invention relates to a composite heat insulation coating for building exterior walls and a preparation method thereof, belonging to the technical field of exterior wall heat insulation coatings, wherein the raw materials of the heat insulation coating comprise a raw material A and a raw material B; the raw material A comprises a silicone-acrylate emulsion, an elastic styrene-acrylate emulsion, a pigment and filler, water, a film forming additive, a silane coupling agent, a wetting agent, a dispersing agent, a defoaming agent and a hydrophobic agent, wherein the pigment and filler comprises expanded perlite, silica aerogel, rutile type titanium dioxide, composite reflective powder, nano silicon carbide, cobalt oxide modified nano activated carbon and glass flakes; the raw material B comprises a thickening agent and a pH regulator. The composite heat-insulating coating for the building outer wall combines three mechanisms of blocking, reflection and radiation together through the synergistic effect of the raw materials, so that the heat-insulating coating achieves the purposes of heat insulation and heat preservation, meets the requirement of building energy conservation in hot summer and cold winter areas, and has the advantage of stable storage.

Description

Composite heat-insulating coating for building exterior wall and preparation method thereof
Technical Field
The invention relates to the technical field of exterior wall heat-insulating coatings, in particular to a composite heat-insulating coating for an exterior wall of a building and a preparation method thereof.
Background
The building external wall heat insulation material realizes heat insulation and heat preservation through a low heat conduction system and high heat resistance. The external wall heat-insulating coating comprises a barrier heat-insulating coating, a reflective heat-insulating coating and a radiation heat-insulating coating. The barrier heat-insulating coating is a coating which realizes heat insulation through low heat conductivity coefficient and high heat resistance; the reflective heat insulation coating is a high-reflectivity coating prepared by selecting proper raw materials, formulas and the like, and reflects sunlight to achieve the purpose of heat insulation; the radiation heat insulation coating emits solar energy absorbed by a building into the air in a long wave form through radiation, so that the heat insulation effect is achieved. With the development of society, the living standard is continuously improved, the technology and technology are continuously improved, and the heat-insulating coating with a single mechanism cannot meet the requirement of building energy conservation in hot summer and cold winter areas, so that a compound heat-insulating coating with multiple mechanisms combined together is urgently needed to be researched, so that the heat-insulating coating achieves the purposes of heat insulation and heat preservation.
Disclosure of Invention
The invention aims to provide a composite heat insulation coating for an outer wall of a building, which combines three mechanisms of obstruction, reflection and radiation together through the synergistic action among raw materials, so that the heat insulation coating achieves the purposes of heat insulation and heat preservation, and meets the requirement of building energy conservation in hot summer and cold winter areas.
The technical purpose of the invention is realized by the following technical scheme:
a composite heat insulation coating for building exterior walls comprises raw materials A and B in percentage by weight;
the raw material A comprises 25-40% of silicone-acrylic emulsion, 8-12% of elastic styrene-acrylic emulsion, 15-32% of pigment and filler, 15-30% of water, 2-3% of film-forming additive, 0.8-1.2% of silane coupling agent, 0.2-0.8% of wetting agent, 0.3-1.2% of dispersing agent, 0.2-1.2% of defoaming agent and 3-5% of hydrophobic agent, wherein the pigment and filler comprises 6-10% of expanded perlite, 3-7% of silicon dioxide aerogel, 6-10% of rutile titanium dioxide, 25-45% of composite reflective powder, 8-15% of nano silicon carbide, 20-24% of cobalt oxide modified nano activated carbon and 5-15% of glass flake;
the raw material B comprises a thickening agent and a pH regulator, wherein the addition amount of the thickening agent is 1.5-3.5% of the total weight of the raw material A, and the addition amount of the pH regulator is 0.1-0.3% of the total weight of the raw material A.
By adopting the technical scheme, three mechanisms of blocking, reflection and radiation are combined together under the synergistic action between the pigment and the filler, the requirement of solar energy blocking outside the building in a summer hot area is met, and the requirement of heat preservation on heat in the building in a winter cold area is also met, so that the requirement of energy conservation of the building in the summer hot winter cold area is met, and the glass flakes are added into the pigment and the filler, so that the adhesive force and the service life of a paint film are improved under the synergistic action between the glass flakes and the raw materials.
More preferably, the raw material A comprises 30% of silicone-acrylic emulsion, 10% of elastic styrene-acrylic emulsion, 25.5% of pigment and filler, 25% of water, 2.5% of film-forming assistant, 1% of silane coupling agent, 0.5% of wetting agent, 0.9% of dispersing agent, 0.5% of defoaming agent and 4% of hydrophobic agent, wherein the pigment and filler comprises 8% of expanded perlite, 5% of silica aerogel, 8% of rutile type titanium dioxide, 35% of composite reflective powder, 12% of nano silicon carbide, 22% of cobalt oxide modified nano activated carbon and 10% of glass flake;
the raw material B comprises a thickening agent and a pH regulator, wherein the addition amount of the thickening agent is 2.5% of the total weight of the raw material A, and the addition amount of the pH regulator is 0.2% of the total weight of the raw material A.
By adopting the technical scheme, the raw material proportion of the heat-insulating coating is further limited, and the overall use effect of heat insulation of the heat-insulating coating is improved.
More preferably, the coalescent is dipropylene glycol n-butyl ether.
By adopting the technical scheme, the dipropylene glycol n-butyl ether can promote the plastic flow and elastic deformation of latex particles, temporarily reduce the glass transition temperature of the heat-insulating coating, and achieve the purpose of reducing the film forming temperature of the heat-insulating coating.
More preferably, the thickening agent is a water repellent ZC 501.
By adopting the technical scheme, the water repellent ZC501 is an associated polyurethane thickener and can be connected into a net structure through secondary valence bonds, so that the viscosity of the heat-insulating coating is increased, the heat-insulating coating has good dispersibility and storage stability, and meanwhile, the water repellent ZC501 is not sensitive to pH and has the advantages of good splashing resistance and leveling property.
More preferably, the hydrophobic agent is hydrophobic agent 6600.
By adopting the technical scheme, the water repellent 6600 is an emulsion formed by mixing polysiloxane resin and silane, when water evaporates along with the film forming of the heat-insulating coating, the water repellent 6600 migrates to the surface from the inside of the paint film, and a hydrophobic barrier is formed on the surface of the paint film, so that the surface tension of the paint film is reduced, the water resistance of the surface of the paint film is improved, and the stain resistance of the surface of the paint film is also improved.
More preferably, the silane coupling agent is a silane coupling agent KH 550.
By adopting the technical scheme, the silane coupling agent KH550 is a low-molecular organic silicide, when the heat-insulating coating is formed into a film, the silane coupling agent KH550 migrates from the interior of the paint film to the surface of the paint film and the plate and reacts with water to generate silanol, the silanol and hydroxyl on the surface of the plate form hydrogen bonds or covalent bonds, the bonding strength between the paint film and the plate is increased, and the adhesive force of the paint film is improved.
More preferably, the silica aerogel is a hydrophobic microfine silica aerogel.
Through adopting above-mentioned technical scheme, silica aerogel is a light nanometer porous structure, and hydrophobic nature superfine silica aerogel is inside not only has more hole, but also has lower coefficient of heat conductivity and higher transparency, can be in the heat preservation coating homodisperse to improve the heat preservation effect of paint film.
More preferably, the cobalt oxide modified nano activated carbon is prepared by the following method: the method comprises the following steps:
(1) preparing cobalt nitrate hexahydrate into a solution, adding acetic acid, and uniformly mixing to obtain a mixed solution;
(2) spraying the mixed solution on the surface of the nano activated carbon, completely absorbing the mixed solution by the nano activated carbon, standing for 3-4h, and drying at the temperature of 70-80 ℃ to obtain loaded activated carbon a;
(3) preparing acetic acid into a solution to obtain an acetic acid solution;
(4) spraying an acetic acid solution on the surface of the loaded activated carbon a, completely absorbing the acetic acid solution by the loaded activated carbon a, standing for 1-2h, and drying at the temperature of 70-80 ℃ to obtain loaded activated carbon b;
(5) roasting the loaded activated carbon b for 1-2h under the protection of inert gas at the temperature of 790-800 ℃, and cooling to obtain the cobalt oxide modified nano activated carbon.
By adopting the technical scheme, cobalt nitrate hexahydrate is easier to dissolve than cobalt nitrate, cobalt nitrate and acetic acid in a mixed solution are loaded in pores in nano activated carbon, as the adsorption capacity of the activated carbon on the acetic acid is greater than that of the cobalt nitrate, the acetic acid preferentially enters the pores of the nano activated carbon and is adsorbed at the central position by the nano activated carbon, the cobalt nitrate enters the pores of the nano activated carbon and is adsorbed at the periphery of the acetic acid by the nano activated carbon to obtain loaded activated carbon a, the acetic acid in an acetic acid solution is loaded in the pores in the loaded activated carbon a, the acetic acid is adsorbed at the periphery of the cobalt nitrate by the loaded activated carbon a to obtain loaded activated carbon b, the acetic acid, the cobalt nitrate and the acetic acid are sequentially loaded in the loaded activated carbon b from outside to inside, then the cobalt nitrate is decomposed to obtain cobalt oxide through roasting, the cobalt oxide modified nano activated carbon is obtained, the absorption of solar energy can be realized, and the cobalt oxide emits solar energy to the air in a long wave form in a radiation form, so that the heat insulation effect of the heat insulation coating is improved, and meanwhile, the cobalt oxide modified nano activated carbon also has the advantages of uniform dispersion and stable use.
More preferably, the weight ratio of the nano activated carbon to the cobalt nitrate hexahydrate to the acetic acid is 100 (5.8-9.7) to (1-2), and the weight ratio of the acetic acid in the step (1) to the acetic acid in the step (3) is 3-4 to 1.
By adopting the technical scheme, the proportion of the nano activated carbon, the cobalt nitrate hexahydrate and the acetic acid is limited, the phenomenon that the heat insulation effect of the heat insulation coating is reduced due to the fact that the loading capacity of the cobalt nitrate is too small is avoided, the phenomenon that the dispersibility of the cobalt nitrate in the nano activated carbon is influenced due to the fact that the loading capacity of the cobalt nitrate is too large is also avoided, the phenomenon that the cobalt nitrate stretches into the center of the nano activated carbon due to the fact that the loading capacity of the acetic acid is too small is also avoided, and the phenomenon that the loading capacity and the dispersibility of the cobalt nitrate are.
The second purpose of the invention is to provide a method for preparing the composite heat insulation coating for the building outer wall, which is to divide the defoaming agent into three parts, and when the pigment and the filler are added, more defoaming agent is added, so that bubbles in the heat insulation coating can be quickly removed, the pigment and the filler are uniformly dispersed, and the storage stability of the heat insulation coating is improved.
The technical purpose of the invention is realized by the following technical scheme:
a method for preparing the composite heat insulation coating for the building outer wall comprises the following steps:
s1, uniformly mixing expanded perlite, silicon dioxide aerogel, rutile type titanium dioxide, composite reflective powder, nano silicon carbide, cobalt oxide modified nano activated carbon and glass flakes to obtain pigment and filler;
s2, dividing the defoaming agent into three parts, namely a defoaming agent a, a defoaming agent b and a defoaming agent c, wherein the weight of the defoaming agent a accounts for 20% of the total weight of the defoaming agent, and the weight of the defoaming agent b accounts for 60% of the total weight of the defoaming agent;
s3, adding a wetting agent, a dispersing agent and a defoaming agent a into water, and stirring for 3-5min to obtain a mixed material a;
s4, adding silicone-acrylic emulsion and elastic styrene-acrylic emulsion into the mixed material a, and stirring for 3-5min to obtain a mixed material b;
s5, adding pigment and filler and a defoaming agent b into the mixed material b, and stirring for 30-40min to obtain a mixed material c;
s6, adding a film-forming aid, a silane coupling agent, a hydrophobic agent and a defoaming agent c into the mixture c, and stirring for 10-20min to obtain a raw material A;
s7, adding a thickening agent into the raw material A, and stirring for 5-10min to obtain a mixed material d;
s8, adding a pH regulator into the mixture d, and continuously stirring for 5-10min to obtain the heat-insulating coating.
Through adopting above-mentioned technical scheme, divide into the triplex and add respectively with the defoaming agent, because the inside bubble that contains of pigment filler, when adding pigment filler, the inside bubble of pigment filler receives the effect of pressure and water, can have some bubbles to spill from pigment filler inside, and when adding pigment filler, pigment filler surface also can bring a small amount of bubbles into compounding b, thereby make and contain a large amount of bubbles in the compounding b, add defoaming agent b this moment, defoaming agent b's weight accounts for 60% of defoaming agent total weight, can get rid of the bubble fast, and make pigment filler dispersion even. The thickening agent and the pH regulator are added into the raw material A, so that the storage stability of the heat-insulating coating can be effectively improved.
In conclusion, the invention has the following beneficial effects:
the composite heat-insulating coating for the building outer wall combines three mechanisms of obstruction, reflection and radiation together through the synergistic action among raw materials and the synergistic action among pigments and fillers, so that the heat-insulating coating achieves the purposes of heat insulation and heat preservation, improves the overall use effect of the heat-insulating coating, and meets the requirement of building energy conservation in hot summer and cold winter areas.
And secondly, the expanded perlite and the silicon dioxide aerogel have low heat conductivity coefficient and multiple pores, the rutile type titanium dioxide and the composite reflection powder have high reflectivity and low heat conductivity coefficient, the nano silicon carbide and the cobalt oxide modified nano activated carbon have low heat conductivity coefficient and high emissivity, the paint film shows good heat preservation and insulation effects through the synergistic action between the pigments and fillers, and the glass flakes are added into the pigments and fillers, so that the adhesive force of the paint film is increased through the synergistic action between the glass flakes and the raw materials.
Thirdly, in the preparation of the cobalt oxide modified nano activated carbon, acetic acid is added, so that the loaded activated carbon b is sequentially loaded with the acetic acid, the cobalt nitrate and the acetic acid from outside to inside, then the cobalt nitrate is decomposed by roasting to obtain the cobalt oxide modified nano activated carbon, the absorption of solar energy can be realized, the cobalt oxide transmits the solar energy to the air in a long wave form in a radiation form, the heat insulation effect of the heat insulation coating is improved, and meanwhile, the cobalt oxide modified nano activated carbon also has the advantages of uniform dispersion and stable use.
Fourthly, the method for preparing the composite heat insulation coating for the building outer wall divides the defoaming agent into three parts, and more defoaming agent is added when the pigment and filler are added, so that bubbles in the heat insulation coating can be quickly removed, the pigment and filler are uniformly dispersed, and the storage stability of the heat insulation coating is improved.
Detailed Description
The present invention will be described in further detail with reference to examples. It should be understood that the preparation methods described in the examples are only for illustrating the present invention and are not to be construed as limiting the present invention, and that the simple modifications of the preparation methods of the present invention based on the concept of the present invention are within the scope of the present invention as claimed.
Table 1 shows the contents of the respective raw materials of the pigments and fillers in the examples (unit:%)
A II III Fourthly Five of them Six ingredients
Expanded perlite 9 10 8 7 6 9
Silica aerogel 6 7 5 4 3 5
Rutile titanium dioxide 9 10 8 7 6 9
Composite reflective powder 28 25 35 40 45 31
Nano silicon carbide 13 10 12 8 15 13
Glass flakes 15 14 10 13 5 13
Cobalt oxide modified nano activated carbon 20 24 22 21 20 20
Total of 100 100 100 100 100 100
TABLE 2 examples the contents of the respective raw materials of the heat-insulating coating (unit: kg)
Example 1
The raw material proportion of the composite heat insulation coating for the building exterior wall is shown in tables 1 and 2.
S1, uniformly mixing expanded perlite, silica aerogel, rutile type titanium dioxide, composite reflection powder, nano silicon carbide, cobalt oxide modified nano activated carbon and glass flakes to obtain a pigment filler, wherein the silica aerogel is hydrophobic micro silica aerogel and is selected from Tengshou thermal insulation material factories in great county; the composite reflective powder is selected from Schott pigment of America;
s2, dividing the defoaming agent SN1340 into three parts, namely a defoaming agent a, a defoaming agent b and a defoaming agent c, wherein the weight of the defoaming agent a accounts for 20% of the total weight of the defoaming agent SN1340, and the weight of the defoaming agent b accounts for 60% of the total weight of the defoaming agent SN 1340;
s3, adding a wetting agent X405, a dispersing agent 5040 and a defoaming agent a into water, and stirring for 3.5min to obtain a mixed material a;
s4, adding silicone-acrylic emulsion and elastic styrene-acrylic emulsion into the mixed material a, and stirring for 3.5min to obtain a mixed material b, wherein the silicone-acrylic emulsion is selected from Guangzhou Guangxuan chemical industry Co., Ltd; the elastic styrene-acrylic emulsion is selected from Kyowa chemical Co., Ltd;
s5, adding pigment and filler and a defoaming agent b into the mixed material b, and stirring for 40min to obtain a mixed material c;
s6, adding a film-forming aid, a silane coupling agent KH550, a water repellent agent 6600 and a defoaming agent c into the mixture c, and stirring for 20min to obtain a raw material A, wherein the film-forming aid is dipropylene glycol n-butyl ether;
s7, adding a water repellent ZC501 into the raw material A, and stirring for 10min to obtain a mixed material d;
and S8, adding a pH regulator into the mixture d, and continuously stirring for 9min to obtain the heat-insulating coating, wherein the pH regulator is ammonia water with the weight percentage of 5%.
The cobalt oxide modified nano activated carbon is prepared by the following method:
(1) preparing cobalt nitrate hexahydrate into a solution, adding acetic acid, and uniformly mixing to obtain a mixed solution;
(2) spraying the mixed solution on the surface of the nano activated carbon, completely absorbing the mixed solution by the nano activated carbon, standing for 3.3 hours, and then drying at the temperature of 75 ℃ to obtain loaded activated carbon a;
(3) preparing acetic acid into a solution to obtain an acetic acid solution;
(4) spraying an acetic acid solution on the surface of the loaded activated carbon a, completely absorbing the acetic acid solution by the loaded activated carbon a, standing for 1.7h, and then drying at the temperature of 75 ℃ to obtain loaded activated carbon b;
(5) and roasting the loaded activated carbon b for 2 hours under the protection of nitrogen at the temperature of 790 ℃, and cooling to obtain the cobalt oxide modified nano activated carbon.
The weight ratio of the nano activated carbon to the cobalt nitrate hexahydrate to the acetic acid is 100:6.8: 1.3;
the weight ratio of the acetic acid in the step (1) to the acetic acid in the step (3) is 3.3: 1;
in the step (1), the weight ratio of the water in the mixed solution to the nano activated carbon is 5.3: 10;
in the step (4), the weight ratio of the water in the acetic acid solution to the loaded activated carbon a is 5.1: 10.
Example 2
The raw material proportion of the composite heat insulation coating for the building exterior wall is shown in tables 1 and 2.
S1, uniformly mixing expanded perlite, silica aerogel, rutile type titanium dioxide, composite reflection powder, nano silicon carbide, cobalt oxide modified nano activated carbon and glass flakes to obtain a pigment filler, wherein the silica aerogel is hydrophobic micro silica aerogel and is selected from Tengshou thermal insulation material factories in great county; the composite reflective powder is selected from Schott pigment of America;
s2, dividing the defoaming agent SN1340 into three parts, namely a defoaming agent a, a defoaming agent b and a defoaming agent c, wherein the weight of the defoaming agent a accounts for 20% of the total weight of the defoaming agent SN1340, and the weight of the defoaming agent b accounts for 60% of the total weight of the defoaming agent SN 1340;
s3, adding a wetting agent X405, a dispersing agent 5040 and a defoaming agent a into water, and stirring for 4.5min to obtain a mixed material a;
s4, adding silicone-acrylic emulsion and elastic styrene-acrylic emulsion into the mixed material a, and stirring for 4.5min to obtain a mixed material b, wherein the silicone-acrylic emulsion is selected from Guangzhou Guangxuan chemical industry Co., Ltd; the elastic styrene-acrylic emulsion is selected from Kyowa chemical Co., Ltd;
s5, adding pigment and filler and a defoaming agent b into the mixed material b, and stirring for 30min to obtain a mixed material c;
s6, adding a film-forming aid, a silane coupling agent KH550, a water repellent agent 6600 and a defoaming agent c into the mixture c, and stirring for 10min to obtain a raw material A, wherein the film-forming aid is dipropylene glycol n-butyl ether;
s7, adding a water repellent ZC501 into the raw material A, and stirring for 5min to obtain a mixed material d;
and S8, adding a pH regulator into the mixture d, and continuously stirring for 6min to obtain the heat-insulating coating, wherein the pH regulator is ammonia water with the weight percentage of 10%.
The cobalt oxide modified nano activated carbon is prepared by the following method:
(1) preparing cobalt nitrate hexahydrate into a solution, adding acetic acid, and uniformly mixing to obtain a mixed solution;
(2) spraying the mixed solution on the surface of the nano activated carbon, completely absorbing the mixed solution by the nano activated carbon, standing for 3.5 hours, and then drying at the temperature of 75 ℃ to obtain loaded activated carbon a;
(3) preparing acetic acid into a solution to obtain an acetic acid solution;
(4) spraying an acetic acid solution on the surface of the loaded activated carbon a, completely absorbing the acetic acid solution by the loaded activated carbon a, standing for 1.5h, and then drying at the temperature of 75 ℃ to obtain loaded activated carbon b;
(5) and roasting the loaded activated carbon b for 1.3h under the protection of nitrogen at the temperature of 797 ℃, and cooling to obtain the cobalt oxide modified nano activated carbon.
The weight ratio of the nano activated carbon to the cobalt nitrate hexahydrate to the acetic acid is 100:8.7: 1.7;
the weight ratio of the acetic acid in the step (1) to the acetic acid in the step (3) is 4.8: 1;
in the step (1), the weight ratio of the water in the mixed solution to the nano activated carbon is 5.7: 10;
in the step (4), the weight ratio of the water in the acetic acid solution to the loaded activated carbon a is 5.5: 10.
Example 3
The raw material proportion of the composite heat insulation coating for the building exterior wall is shown in tables 1 and 2.
S1, uniformly mixing expanded perlite, silica aerogel, rutile type titanium dioxide, composite reflection powder, nano silicon carbide, cobalt oxide modified nano activated carbon and glass flakes to obtain a pigment filler, wherein the silica aerogel is hydrophobic micro silica aerogel and is selected from Tengshou thermal insulation material factories in great county; the composite reflective powder is selected from Schott pigment of America;
s2, dividing the defoaming agent SN1340 into three parts, namely a defoaming agent a, a defoaming agent b and a defoaming agent c, wherein the weight of the defoaming agent a accounts for 20% of the total weight of the defoaming agent SN1340, and the weight of the defoaming agent b accounts for 60% of the total weight of the defoaming agent SN 1340;
s3, adding a wetting agent X405, a dispersing agent 5040 and a defoaming agent a into water, and stirring for 4min to obtain a mixed material a;
s4, adding silicone-acrylic emulsion and elastic styrene-acrylic emulsion into the mixed material a, and stirring for 4min to obtain a mixed material b, wherein the silicone-acrylic emulsion is selected from Guangzhou Guangxuan chemical industry Co., Ltd; the elastic styrene-acrylic emulsion is selected from Kyowa chemical Co., Ltd;
s5, adding pigment and filler and a defoaming agent b into the mixed material b, and stirring for 35min to obtain a mixed material c;
s6, adding a film-forming aid, a silane coupling agent KH550, a water repellent agent 6600 and a defoaming agent c into the mixture c, and stirring for 15min to obtain a raw material A, wherein the film-forming aid is dipropylene glycol n-butyl ether;
s7, adding a water repellent ZC501 into the raw material A, and stirring for 7min to obtain a mixed material d;
and S8, adding a pH regulator into the mixture d, and continuously stirring for 8min to obtain the heat-insulating coating, wherein the pH regulator is 7 wt% of ammonia water.
The cobalt oxide modified nano activated carbon is prepared by the following method:
(1) preparing cobalt nitrate hexahydrate into a solution, adding acetic acid, and uniformly mixing to obtain a mixed solution;
(2) spraying the mixed solution on the surface of the nano activated carbon, completely absorbing the mixed solution by the nano activated carbon, standing for 3.5 hours, and then drying at the temperature of 75 ℃ to obtain loaded activated carbon a;
(3) preparing acetic acid into a solution to obtain an acetic acid solution;
(4) spraying an acetic acid solution on the surface of the loaded activated carbon a, completely absorbing the acetic acid solution by the loaded activated carbon a, standing for 1.5h, and then drying at the temperature of 75 ℃ to obtain loaded activated carbon b;
(5) and roasting the loaded activated carbon b for 1.5h under the protection of nitrogen at the temperature of 795 ℃, and cooling to obtain the cobalt oxide modified nano activated carbon.
The weight ratio of the nano activated carbon to the cobalt nitrate hexahydrate to the acetic acid is 100:7.8: 1.5;
the weight ratio of the acetic acid in the step (1) to the acetic acid in the step (3) is 3.5: 1;
in the step (1), the weight ratio of the water in the mixed solution to the nano activated carbon is 5.5: 10;
in the step (4), the weight ratio of the water in the acetic acid solution to the loaded activated carbon a is 5.2: 10.
Example 4
The raw material proportion of the composite heat insulation coating for the building exterior wall is shown in tables 1 and 2.
S1, uniformly mixing expanded perlite, silica aerogel, rutile type titanium dioxide, composite reflection powder, nano silicon carbide, cobalt oxide modified nano activated carbon and glass flakes to obtain a pigment filler, wherein the silica aerogel is hydrophobic micro silica aerogel and is selected from Tengshou thermal insulation material factories in great county; the composite reflective powder is selected from Schott pigment of America;
s2, dividing the defoaming agent SN1340 into three parts, namely a defoaming agent a, a defoaming agent b and a defoaming agent c, wherein the weight of the defoaming agent a accounts for 20% of the total weight of the defoaming agent SN1340, and the weight of the defoaming agent b accounts for 60% of the total weight of the defoaming agent SN 1340;
s3, adding a wetting agent X405, a dispersing agent 5040 and a defoaming agent a into water, and stirring for 3min to obtain a mixed material a;
s4, adding silicone-acrylic emulsion and elastic styrene-acrylic emulsion into the mixed material a, and stirring for 3min to obtain a mixed material b, wherein the silicone-acrylic emulsion is selected from Guangzhou Guangxuan chemical industry Co., Ltd; the elastic styrene-acrylic emulsion is selected from Kyowa chemical Co., Ltd;
s5, adding pigment and filler and a defoaming agent b into the mixed material b, and stirring for 40min to obtain a mixed material c;
s6, adding a film-forming aid, a silane coupling agent KH550, a water repellent agent 6600 and a defoaming agent c into the mixture c, and stirring for 20min to obtain a raw material A, wherein the film-forming aid is dipropylene glycol n-butyl ether;
s7, adding a water repellent ZC501 into the raw material A, and stirring for 9min to obtain a mixed material d;
and S8, adding a pH regulator into the mixture d, and continuously stirring for 10min to obtain the heat-insulating coating, wherein the pH regulator is ammonia water with the weight percentage of 6%.
The cobalt oxide modified nano activated carbon is prepared by the following method:
(1) preparing cobalt nitrate hexahydrate into a solution, adding acetic acid, and uniformly mixing to obtain a mixed solution;
(2) spraying the mixed solution on the surface of the nano activated carbon, completely absorbing the mixed solution by the nano activated carbon, standing for 3 hours, and then drying at the temperature of 80 ℃ to obtain loaded activated carbon a;
(3) preparing acetic acid into a solution to obtain an acetic acid solution;
(4) spraying an acetic acid solution on the surface of the loaded activated carbon a, completely absorbing the acetic acid solution by the loaded activated carbon a, standing for 1h, and then drying at the temperature of 80 ℃ to obtain loaded activated carbon b;
(5) and roasting the loaded activated carbon b for 1.7h under the protection of nitrogen at the temperature of 795 ℃, and cooling to obtain the cobalt oxide modified nano activated carbon.
The weight ratio of the nano activated carbon to the cobalt nitrate hexahydrate to the acetic acid is 100:5.8: 1;
the weight ratio of the acetic acid in the step (1) to the acetic acid in the step (3) is 3: 1;
in the step (1), the weight ratio of the water in the mixed solution to the nano activated carbon is 5: 10;
in the step (4), the weight ratio of the water in the acetic acid solution to the loaded activated carbon a is 4.8: 10.
Example 5
The raw material proportion of the composite heat insulation coating for the building exterior wall is shown in tables 1 and 2.
S1, uniformly mixing expanded perlite, silica aerogel, rutile type titanium dioxide, composite reflection powder, nano silicon carbide, cobalt oxide modified nano activated carbon and glass flakes to obtain a pigment filler, wherein the silica aerogel is hydrophobic micro silica aerogel and is selected from Tengshou thermal insulation material factories in great county; the composite reflective powder is selected from Schott pigment of America;
s2, dividing the defoaming agent SN1340 into three parts, namely a defoaming agent a, a defoaming agent b and a defoaming agent c, wherein the weight of the defoaming agent a accounts for 20% of the total weight of the defoaming agent SN1340, and the weight of the defoaming agent b accounts for 60% of the total weight of the defoaming agent SN 1340;
s3, adding a wetting agent X405, a dispersing agent 5040 and a defoaming agent a into water, and stirring for 4min to obtain a mixed material a;
s4, adding silicone-acrylic emulsion and elastic styrene-acrylic emulsion into the mixed material a, and stirring for 4min to obtain a mixed material b, wherein the silicone-acrylic emulsion is selected from Guangzhou Guangxuan chemical industry Co., Ltd; the elastic styrene-acrylic emulsion is selected from Kyowa chemical Co., Ltd;
s5, adding pigment and filler and a defoaming agent b into the mixed material b, and stirring for 33min to obtain a mixed material c;
s6, adding a film-forming aid, a silane coupling agent KH550, a water repellent agent 6600 and a defoaming agent c into the mixture c, and stirring for 12min to obtain a raw material A, wherein the film-forming aid is dipropylene glycol n-butyl ether;
s7, adding a water repellent ZC501 into the raw material A, and stirring for 6min to obtain a mixed material d;
and S8, adding a pH regulator into the mixture d, and continuously stirring for 5min to obtain the heat-insulating coating, wherein the pH regulator is ammonia water with the weight percentage of 9%.
The cobalt oxide modified nano activated carbon is prepared by the following method:
(1) preparing cobalt nitrate hexahydrate into a solution, adding acetic acid, and uniformly mixing to obtain a mixed solution;
(2) spraying the mixed solution on the surface of the nano activated carbon, completely absorbing the mixed solution by the nano activated carbon, standing for 3.7 hours, and then drying at the temperature of 70 ℃ to obtain loaded activated carbon a;
(3) preparing acetic acid into a solution to obtain an acetic acid solution;
(4) spraying an acetic acid solution on the surface of the loaded activated carbon a, completely absorbing the acetic acid solution by the loaded activated carbon a, standing for 1.3h, and then drying at the temperature of 70 ℃ to obtain loaded activated carbon b;
(5) and roasting the loaded activated carbon b for 1.7h under the protection of nitrogen at the temperature of 793 ℃, and cooling to obtain the cobalt oxide modified nano activated carbon.
The weight ratio of the nano activated carbon to the cobalt nitrate hexahydrate to the acetic acid is 100:9.7: 2;
the weight ratio of the acetic acid in the step (1) to the acetic acid in the step (3) is 5: 1;
in the step (1), the weight ratio of the water in the mixed solution to the nano activated carbon is 6: 10;
in the step (4), the weight ratio of the water in the acetic acid solution to the loaded activated carbon a is 5.8: 10.
Example 6
The raw material proportion of the composite heat insulation coating for the building exterior wall is shown in tables 1 and 2.
S1, uniformly mixing expanded perlite, silica aerogel, rutile type titanium dioxide, composite reflection powder, nano silicon carbide, cobalt oxide modified nano activated carbon and glass flakes to obtain a pigment filler, wherein the silica aerogel is hydrophobic micro silica aerogel and is selected from Tengshou thermal insulation material factories in great county; the composite reflective powder is selected from Schott pigment of America;
s2, dividing the defoaming agent SN1340 into three parts, namely a defoaming agent a, a defoaming agent b and a defoaming agent c, wherein the weight of the defoaming agent a accounts for 20% of the total weight of the defoaming agent SN1340, and the weight of the defoaming agent b accounts for 60% of the total weight of the defoaming agent SN 1340;
s3, adding a wetting agent X405, a dispersing agent 5040 and a defoaming agent a into water, and stirring for 5min to obtain a mixed material a;
s4, adding silicone-acrylic emulsion and elastic styrene-acrylic emulsion into the mixed material a, and stirring for 5min to obtain a mixed material b, wherein the silicone-acrylic emulsion is selected from Guangzhou Guangxuan chemical industry Co., Ltd; the elastic styrene-acrylic emulsion is selected from Kyowa chemical Co., Ltd;
s5, adding pigment and filler and a defoaming agent b into the mixed material b, and stirring for 37min to obtain a mixed material c;
s6, adding a film-forming aid, a silane coupling agent KH550, a water repellent agent 6600 and a defoaming agent c into the mixture c, and stirring for 17min to obtain a raw material A, wherein the film-forming aid is dipropylene glycol n-butyl ether;
s7, adding a water repellent ZC501 into the raw material A, and stirring for 8min to obtain a mixed material d;
and S8, adding a pH regulator into the mixture d, and continuously stirring for 7min to obtain the heat-insulating coating, wherein the pH regulator is ammonia water with the weight percentage of 8%.
The cobalt oxide modified nano activated carbon is prepared by the following method:
(1) preparing cobalt nitrate hexahydrate into a solution, adding acetic acid, and uniformly mixing to obtain a mixed solution;
(2) spraying the mixed solution on the surface of the nano activated carbon, completely absorbing the mixed solution by the nano activated carbon, standing for 4 hours, and then drying at the temperature of 70 ℃ to obtain loaded activated carbon a;
(3) preparing acetic acid into a solution to obtain an acetic acid solution;
(4) spraying an acetic acid solution on the surface of the loaded activated carbon a, completely absorbing the acetic acid solution by the loaded activated carbon a, standing for 2 hours, and then drying at the temperature of 70 ℃ to obtain loaded activated carbon b;
(5) and roasting the loaded activated carbon b for 1h under the protection of nitrogen at the temperature of 800 ℃, and cooling to obtain the cobalt oxide modified nano activated carbon.
The weight ratio of the nano activated carbon to the cobalt nitrate hexahydrate to the acetic acid is 100:8.7: 1.7;
the weight ratio of the acetic acid in the step (1) to the acetic acid in the step (3) is 4.8: 1;
in the step (1), the weight ratio of the water in the mixed solution to the nano activated carbon is 5.7: 10;
in the step (4), the weight ratio of the water in the acetic acid solution to the loaded activated carbon a is 5.4: 10.
Comparative example 1
Commercial Dabang thermal insulation paint is adopted.
Comparative example 2
The difference between the comparative example and the example 3 is that the cobalt oxide modified nano activated carbon is not added in the pigment and filler.
Comparative example 3
The difference between the comparative example and the example 3 is that the nano-silicon carbide and the cobalt oxide modified nano-activated carbon are not added in the pigment and filler.
Comparative example 4
The difference between the comparative example and the example 3 is that only nano silicon carbide and cobalt oxide modified nano activated carbon is in the pigment and filler.
Comparative example 5
The difference between the comparative example and example 3 is that the pigment and filler only contains expanded perlite and silica aerogel.
Comparative example 6
The difference between the comparative example and the example 3 is that only rutile type titanium dioxide and composite reflective powder are contained in the pigment and filler.
Comparative example 7
This comparative example differs from example 3 in that no glass flake is added to the pigment-filler.
The following property tests were carried out on the heat-insulating coatings obtained in examples 1 to 6 and comparative examples 1 to 7, and the test results are shown in Table 3.
Wherein, the heat insulation temperature difference of the paint film is detected according to JG/T235-2014 reflective thermal insulation coating for buildings;
according to JG/T1040-2007 thermal reflective insulation coating for building external surface, detecting the solar reflectance of the paint film and the hemispherical emissivity of the paint film;
according to GB/T17371-2008 silicate composite heat-insulating coating, detecting the heat conductivity coefficient of a paint film at 25 ℃;
the paint film adhesion level was tested according to GB/T9286-1998 test Cross section on paints and varnishes.
TABLE 3 test results
As can be seen from Table 3, the heat-insulating coating disclosed by the invention combines three mechanisms of blocking, reflection and radiation together through the synergistic action among the raw materials, and through the synergistic action among the pigments and the fillers, the heat-insulating temperature difference of a paint film reaches 8.5 ℃ at most, the solar reflectance of the paint film reaches 81.62% at most, the hemispherical emissivity reaches 91% at most, the heat conductivity coefficient reaches 0.135w/m.k at least, and the adhesive force reaches 0 level, so that the heat-insulating coating achieves the purposes of heat insulation and heat preservation, the overall use effect of the heat-insulating coating is improved, the requirement of blocking solar energy outside a building in a summer hot area is met, the requirement of preserving heat in the building in a winter cold area is met, and the requirement of saving energy of the building in the summer hot and winter cold areas is met.
According to the invention, the expanded perlite and the silicon dioxide aerogel not only have lower heat conductivity coefficient, but also have more pores and higher transparency inside the silicon dioxide aerogel, can be uniformly dispersed in the heat-insulating coating, can block a thermal bridge in a paint film, and realize heat insulation and preservation through obvious thermal impedance to solar energy; the rutile titanium dioxide and the composite reflective powder have high reflectivity and low heat conductivity coefficient, solar energy is prevented from being conducted into the paint film through reflection of the solar energy, part of the solar energy is conducted into the paint film, the solar energy is converted into wavelength by the nano silicon carbide and is emitted into the air, and the rest of the solar energy is conducted into the paint film, is quickly absorbed and converted by the cobalt oxide modified nano activated carbon, so that the purposes of heat insulation and heat preservation are achieved. Meanwhile, in the invention, the glass flakes are added into the pigment and filler, and the adhesive force of the paint film is increased and the service life of the paint film is prolonged under the synergistic action of the glass flakes and the raw materials.

Claims (8)

1. The composite heat-insulating coating for the building outer wall is characterized in that: the raw materials of the heat-insulating coating comprise a raw material A and a raw material B in percentage by weight;
the raw material A comprises 25-40% of silicone-acrylic emulsion, 8-12% of elastic styrene-acrylic emulsion, 15-32% of pigment and filler, 15-30% of water, 2-3% of film-forming additive, 0.8-1.2% of silane coupling agent, 0.2-0.8% of wetting agent, 0.3-1.2% of dispersing agent, 0.2-1.2% of defoaming agent and 3-5% of hydrophobic agent, wherein the pigment and filler comprises 6-10% of expanded perlite, 3-7% of silicon dioxide aerogel, 6-10% of rutile titanium dioxide, 25-45% of composite reflective powder, 8-15% of nano silicon carbide, 20-24% of cobalt oxide modified nano activated carbon and 5-15% of glass flake;
the raw material B comprises a thickening agent and a pH regulator, wherein the addition amount of the thickening agent is 1.5-3.5% of the total weight of the raw material A, and the addition amount of the pH regulator is 0.1-0.3% of the total weight of the raw material A;
the cobalt oxide modified nano activated carbon is prepared by the following method: the method comprises the following steps:
(1) preparing cobalt nitrate hexahydrate into a solution, adding acetic acid, and uniformly mixing to obtain a mixed solution;
(2) spraying the mixed solution on the surface of the nano activated carbon, completely absorbing the mixed solution by the nano activated carbon, standing for 3-4h, and drying at the temperature of 70-80 ℃ to obtain loaded activated carbon a;
(3) preparing acetic acid into a solution to obtain an acetic acid solution;
(4) spraying an acetic acid solution on the surface of the loaded activated carbon a, completely absorbing the acetic acid solution by the loaded activated carbon a, standing for 1-2h, and drying at the temperature of 70-80 ℃ to obtain loaded activated carbon b;
(5) roasting the loaded activated carbon b for 1-2h under the protection of inert gas at the temperature of 790-800 ℃, and cooling to obtain cobalt oxide modified nano activated carbon;
the weight ratio of the nano activated carbon to the cobalt nitrate hexahydrate to the acetic acid is 100 (5.8-9.7) to (1-2), and the weight ratio of the acetic acid in the step (1) to the acetic acid in the step (3) is 3-4 to 1.
2. The composite heat insulation coating for the outer wall of the building as claimed in claim 1, wherein: the raw material A comprises 30% of silicone-acrylic emulsion, 10% of elastic styrene-acrylic emulsion, 25.5% of pigment and filler, 25% of water, 2.5% of film-forming additive, 1.1% of silane coupling agent, 0.5% of wetting agent, 0.9% of dispersing agent, 0.5% of defoaming agent and 4% of hydrophobic agent, wherein the pigment and filler comprises 8% of expanded perlite, 5% of silicon dioxide aerogel, 8% of rutile titanium dioxide, 35% of composite reflective powder, 12% of nano silicon carbide, 22% of cobalt oxide modified nano activated carbon and 10% of glass flake;
the raw material B comprises a thickening agent and a pH regulator, wherein the addition amount of the thickening agent is 2.5% of the total weight of the raw material A, and the addition amount of the pH regulator is 0.2% of the total weight of the raw material A.
3. The composite heat insulation coating for the outer wall of the building as claimed in claim 1, wherein: the film-forming aid is dipropylene glycol n-butyl ether.
4. The composite heat insulation coating for the outer wall of the building as claimed in claim 1, wherein: the thickening agent is a water repellent ZC 501.
5. The composite heat insulation coating for the outer wall of the building as claimed in claim 1, wherein: the hydrophobic agent is 6600.
6. The composite heat insulation coating for the outer wall of the building as claimed in claim 1, wherein: the silane coupling agent is a silane coupling agent KH 550.
7. The composite heat insulation coating for the outer wall of the building as claimed in claim 1, wherein: the silicon dioxide aerogel is hydrophobic superfine silicon dioxide aerogel.
8. A method for preparing the composite thermal insulation coating for the external wall of the building as claimed in any one of claims 1 to 7, which is characterized in that: the method comprises the following steps:
s1, uniformly mixing expanded perlite, silicon dioxide aerogel, rutile type titanium dioxide, composite reflective powder, nano silicon carbide, cobalt oxide modified nano activated carbon and glass flakes to obtain pigment and filler;
s2, dividing the defoaming agent into three parts, namely a defoaming agent a, a defoaming agent b and a defoaming agent c, wherein the weight of the defoaming agent a accounts for 20% of the total weight of the defoaming agent, and the weight of the defoaming agent b accounts for 60% of the total weight of the defoaming agent;
s3, adding a wetting agent, a dispersing agent and a defoaming agent a into water, and stirring for 3-5min to obtain a mixed material a;
s4, adding silicone-acrylic emulsion and elastic styrene-acrylic emulsion into the mixed material a, and stirring for 3-5min to obtain a mixed material b;
s5, adding pigment and filler and a defoaming agent b into the mixed material b, and stirring for 30-40min to obtain a mixed material c;
s6, adding a film-forming aid, a silane coupling agent, a hydrophobic agent and a defoaming agent c into the mixture c, and stirring for 10-20min to obtain a raw material A;
s7, adding a thickening agent into the raw material A, and stirring for 5-10min to obtain a mixed material d;
s8, adding a pH regulator into the mixture d, and continuously stirring for 5-10min to obtain the heat-insulating coating.
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