CN112175461A - Exterior wall heat-insulation middle coating and preparation method thereof - Google Patents
Exterior wall heat-insulation middle coating and preparation method thereof Download PDFInfo
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- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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Abstract
The application relates to the technical field of exterior wall coatings, and particularly discloses an exterior wall heat-insulation middle coating and a preparation method thereof, wherein the exterior wall heat-insulation middle coating comprises 8-15% of acrylic emulsion; 25-35% of inorganic resin; 10-20% of inorganic polymer powder; 0.3 to 0.5 percent of film forming additive; 5-10% of aerogel; 5-10% of hollow microspheres; 0.5 to 1 percent of thickening agent; 0.3 to 0.5 percent of foaming agent; 0.3 to 0.5 percent of foam stabilizer; 1-1.5% of ethylene glycol; 0.1 to 0.2 percent of pH regulator; 20-30% of water. The preparation method comprises the following steps: s1, adding water, a thickening agent, a pH regulator, a foaming agent and a foam stabilizer into a stirring kettle, and uniformly stirring for foaming; s2, continuously adding inorganic resin, acrylic emulsion, glycol and film-forming auxiliary agent, and uniformly stirring; and S3, continuously adding inorganic polymer powder, hollow microspheres and aerogel, continuously stirring uniformly, and discharging to obtain the external wall heat-insulation middle coating. The external wall heat-insulation middle coating prepared by the application has the advantages of outstanding heat-insulation effect and good fireproof performance.
Description
Technical Field
The application relates to the technical field of exterior wall coatings, in particular to an exterior wall heat-insulating middle coating and a preparation method thereof.
Background
The middle coat is a coating layer which is directly sprayed on the bottom layer and is adhered to the bottom layer, and the main purpose of the middle coat is to uniformly color the leather surface. The layer is required to have bright color and luster, good leveling property and covering capacity, harder film than the bottom layer, ironing resistance, higher tensile strength and wear resistance, smaller extensibility, certain brightness, cold resistance and organic solvent resistance.
The external wall insulation in the current market mainly adopts a construction process that an insulation board is used, insulation putty is coated after the insulation board is dry-hung, and finally external wall finish paint is coated. The heat insulation system is easy to crack and seep water and fall off to hurt people along with the lapse of time. Later, the process of combining the thermal insulation mortar for the outer wall with the thermal insulation desulfurized gypsum for the inner wall can simplify construction and is not easy to fall off, but the thermal conductivity coefficient is 0.08W/(m.K), and the thermal insulation effect is not ideal. Later, the reflective heat-insulating coating appears on the market, but has the defects of low reflective function, low protection grade, greater influence by seasons and incapability of popularization. In addition, at present, the application of the external wall insulation board is forbidden gradually in Shanghai city, so that the external wall insulation paint with outstanding insulation effect and good fireproof performance is not reported in documents and patents, and therefore, a new scheme needs to be provided to solve the problems.
Disclosure of Invention
Aiming at the defects of weak heat insulation effect and poor fireproof performance of the external wall heat insulation coating in the existing market, the purpose one of the application is to provide an external wall heat insulation middle coating which has the advantages of outstanding heat insulation effect and good fireproof performance.
The second purpose of the application is to provide a preparation method of the external wall heat-insulation middle coating, which has the advantages of simple preparation method and suitability for industrial production.
In order to achieve the first purpose, the application provides the following technical scheme:
the heat-insulating middle coating for the outer wall comprises the following components in percentage by weight:
acrylic emulsion: 8 to 15 percent;
inorganic resin: 25 to 35 percent;
inorganic polymer powder: 10 to 20 percent;
film-forming auxiliary agent: 0.3 to 0.5 percent;
aerogel: 5 to 10 percent;
hollow microspheres: 5 to 10 percent;
thickening agent: 0.5-1%;
foaming agent: 0.3 to 0.5 percent;
foam stabilizer: 0.3 to 0.5 percent;
ethylene glycol: 1 to 1.5 percent;
pH regulator: 0.1 to 0.2 percent;
water: 20 to 30 percent.
By adopting the technical scheme, the acrylic emulsion is a main film forming substance in the coating, the adhesive property is good, and the inorganic resin mainly improves the fireproof performance of the coating; by adopting the technical scheme, the inorganic high polymer powder with low heat conductivity coefficient, the aerogel and the hollow microspheres are compounded and used in the coating, and other auxiliary agents are matched, so that the prepared outer wall coating has the advantages of excellent heat insulation effect and good fireproof performance.
Further preferably, the external wall heat-insulation middle coating comprises the following components in percentage by weight:
acrylic emulsion: 11 percent;
inorganic resin: 29 percent;
inorganic polymer powder: 16 percent;
film-forming auxiliary agent: 0.4 percent;
aerogel: 8 percent;
hollow microspheres: 8 percent;
thickening agent: 0.7 percent;
foaming agent: 0.4 percent;
foam stabilizer: 0.4 percent;
ethylene glycol: 1.2 percent;
pH regulator: 0.1 percent;
water: 24.8 percent.
By adopting the technical scheme and selecting the raw material components in the proportion, the prepared coating has more outstanding heat-insulating effect and fireproof performance after forming a coating film in construction.
More preferably, the inorganic resin is a mixture of water glass and acrylic emulsion, and the water glass is one or two selected from potassium silicate and sodium silicate.
By adopting the technical scheme, the fireproof performance of the coating can be improved by adding potassium silicate or sodium silicate into the coating.
More preferably, the inorganic polymer powder is silicon resin containing Si-O group, the heat conductivity coefficient is 0.03-0.04W/(m.K), and the particle diameter is 180-220 meshes.
By adopting the technical scheme, the inorganic high polymer powder adopts the silicone resin containing inorganic groups, and the silicone resin with the heat conductivity coefficient of 0.03-0.04W/(m.K) and the fire-proof grade of A is selected to be compounded with aerogel and glass beads for use, so that the coating film has the characteristics of low heat conductivity and high fire-proof performance.
More preferably, the aerogel is silicon dioxide aerogel, and the thermal conductivity coefficient of the aerogel is 0.02-0.03W/(m.K).
By adopting the technical scheme, the aerogel adopts the silicon dioxide aerogel with the heat conductivity coefficient of 0.02-0.03W/(m.K), and the silicon dioxide aerogel is compounded with inorganic high molecular powder and glass beads for use, so that the coating film has the characteristics of low heat conductivity and high fireproof performance.
More preferably, the hollow microsphere is selected from one of expanded vitrified microsphere and ultralight ceramic sand made of fly ash, the heat conductivity coefficient of the hollow microsphere is 0.03-0.04W/(m.K), and the particle size is 550-650 meshes.
By adopting the technical scheme, the heat conductivity coefficient of the hollow microspheres is controlled to be 0.03-0.04W/(m.K), the particle size is controlled to be 550-650 meshes, and the hollow microspheres are compounded with electrodeless polymer powder and aerogel for use, so that the coating film has the characteristics of low heat conductivity and high fireproof performance.
More preferably, the film-forming aid is propylene glycol butyl ether.
By adopting the technical scheme, the propylene glycol butyl ether can improve the coalescence property of acrylic acid, so that the coating can form a film within a wider construction temperature range.
In order to achieve the second purpose, the application provides the following technical scheme:
a preparation method of an external wall heat-insulation middle coating comprises the following steps:
s1, adding water, a thickening agent, a pH regulator, a foaming agent and a foam stabilizer into a stirring kettle, and stirring at the rotating speed of 500-800r/min for 10-15 min;
s2, continuously adding inorganic resin, acrylic emulsion, glycol and film-forming auxiliary agent, and stirring for 15-30min at the rotating speed of 600-800 r/min;
s3, continuously adding inorganic polymer powder, hollow microspheres and aerogel, stirring for 10-15min at the rotating speed of 300-400r/min, and discharging to obtain the external wall heat-insulating middle coating.
In summary, compared with the prior art, the application has the following beneficial effects:
(1) according to the external wall coating, inorganic high polymer powder with low heat conductivity coefficient, aerogel and hollow microspheres are compounded and matched with other auxiliary agents, so that the prepared external wall coating has the advantages of excellent heat insulation effect and good fireproof performance;
(2) inorganic resin in this application comprises water glass and acrylic acid emulsion, and inorganic polymer powder adopts the silicon resin that contains inorganic group, and the aerogel adopts silica aerogel, and the hollow bead adopts expanded vitrified micro bubble or ultralight pottery sand, and the coefficient of heat conductivity of above-mentioned component is all lower, uses with other auxiliary agent cooperations after the complex, and the coating that makes still has high fire behavior when having low heat conduction characteristic.
Drawings
Fig. 1 is a flow chart of a preparation process of the external wall heat-insulating intermediate coating in example 1 of the present application.
Detailed Description
The present application will be described in detail with reference to examples.
The acrylic emulsion in this application is purchased from Zhejiang Yufeng New materials, Inc.;
the thickener is inorganic bentonite, and is available from Saint Pacific Bentonite GmbH;
the foaming agent adopts cyclopentane and is purchased from Nanjing Mizhong refining energy Co;
the foam stabilizer is polyacrylamide foam stabilizer purchased from Nanjing Daye building energy saving technology Limited;
the pH regulator adopts butyl ethanolamine and is purchased from Xindian chemical materials (Shanghai) Limited company;
the film-forming assistant adopts propylene glycol butyl ether and is purchased from Yangzhou Tianda chemical industry Co.
In addition, other materials in this application are all commonly commercially available.
Example 1:
the components and the corresponding weight percentages of the external wall heat-insulating middle coating are shown in the table 1, wherein the inorganic high polymer powder is silicon resin containing Si-O, the heat conductivity coefficient is 0.03W/(m.K), and the median particle size is 180 meshes;
the aerogel is silicon dioxide aerogel, and the heat conductivity coefficient is 0.02W/(m.K);
the hollow micro-beads adopt expanded vitrified micro-beads, the heat conductivity coefficient is 0.03W/(m.K), and the median particle size is 550 meshes;
the inorganic resin is obtained by the following preparation steps:
mixing 60 parts of potassium silicate and 10 parts of water, stirring for 10min at the rotating speed of 600r/min, adding 2 parts of methyltriethoxysilane coupling agent, stirring for 5h at the rotating speed of 400r/min, then adding 10 parts of acrylic emulsion, continuously stirring for 1h, and discharging to obtain the inorganic resin.
The steps for preparing the exterior wall heat-insulation middle coating by utilizing the raw material components are as follows:
s1, adding water, a thickening agent, a pH regulator, a foaming agent and a foam stabilizer into a stirring kettle, and stirring for 15min at the rotating speed of 500 r/min;
s2, continuously adding inorganic resin, acrylic emulsion, glycol and film-forming auxiliary agent, and stirring for 30min at the rotating speed of 600 r/min;
and S3, continuously adding inorganic polymer powder, hollow microspheres and aerogel, stirring for 15min at the rotating speed of 300r/min, and discharging to obtain the external wall heat-insulation middle coating.
Examples 2 to 6:
the exterior wall heat-insulating intermediate coating is different from the example 1 in that the components and the corresponding parts by weight are shown in the table 1.
TABLE 1 Components and parts by weight of examples 1-6
Example 7:
the heat-insulating middle coating for the outer wall has the same raw material components as those in the embodiment 1, and is different from the embodiment 1 in that the inorganic high polymer powder is silicon resin containing Si-O, the heat conductivity coefficient is 0.035W/(m.K), and the median particle size is 200 meshes;
the aerogel is silicon dioxide aerogel, and the heat conductivity coefficient is 0.025W/(m.K);
the hollow micro-beads adopt expanded vitrified micro-beads, the heat conductivity coefficient is 0.035W/(m.K), and the median particle size is 600 meshes;
the inorganic resin is obtained by the following preparation steps:
mixing 15 parts of potassium silicate, 15 parts of sodium silicate and 6 parts of water, stirring for 5min at the rotating speed of 800r/min, adding 1.2 parts of methyltriethoxysilane coupling agent, stirring for 5h at the rotating speed of 600r/min, adding 5 parts of acrylic emulsion, continuously stirring for 1h, and discharging to obtain the inorganic resin.
The steps for preparing the exterior wall heat-insulation middle coating by utilizing the raw material components are as follows:
s1, adding water, a thickening agent, a pH regulator, a foaming agent and a foam stabilizer into a stirring kettle, and stirring for 13min at the rotating speed of 650 r/min;
s2, continuously adding inorganic resin, acrylic emulsion, glycol and film-forming auxiliary agent, and stirring at the rotating speed of 650r/min for 22 min;
and S3, continuously adding inorganic polymer powder, hollow microspheres and aerogel, stirring for 13min at the rotating speed of 350r/min, and discharging to obtain the external wall heat-insulation middle coating.
Example 8:
the heat-insulating middle coating for the outer wall has the same raw material components as those in the embodiment 1, and is different from the embodiment 1 in that the inorganic high polymer powder is silicon resin containing Si-O, the heat conductivity coefficient is 0.04W/(m.K), and the median particle size is 220 meshes;
the aerogel is silicon dioxide aerogel, and the heat conductivity coefficient is 0.03W/(m.K);
the hollow microspheres are ultra-light ceramic sand prepared from fly ash, the heat conductivity coefficient is 0.04W/(m.K), and the median particle size is 650 meshes;
the inorganic resin is obtained by the following preparation steps:
mixing 60 parts of sodium silicate and 10 parts of water, stirring for 10min at the rotating speed of 600r/min, adding 2 parts of methyltriethoxysilane coupling agent, stirring for 5h at the rotating speed of 400r/min, then adding 10 parts of acrylic emulsion, continuously stirring for 1h, and discharging to obtain the inorganic resin.
The steps for preparing the exterior wall heat-insulation middle coating by utilizing the raw material components are as follows:
s1, adding water, a thickening agent, a pH regulator, a foaming agent and a foam stabilizer into a stirring kettle, and stirring at the rotating speed of 800r/min for 10 min;
s2, continuously adding inorganic resin, acrylic emulsion, glycol and film-forming auxiliary agent, and stirring at the rotating speed of 800r/min for 15 min;
and S3, continuously adding inorganic polymer powder, hollow microspheres and aerogel, stirring for 10min at the rotating speed of 400r/min, and discharging to obtain the external wall heat-insulation middle coating.
Comparative example 1: the exterior wall heat-insulation middle coating comprises the same raw material components as those in the embodiment 1, and comprises the following preparation steps:
s1, adding water, a thickening agent, a pH regulator, a foaming agent and a foam stabilizer into a stirring kettle, and stirring for 15min at the rotating speed of 500 r/min;
s2, continuously adding inorganic resin, acrylic emulsion, glycol and film-forming auxiliary agent, and stirring for 30min at the rotating speed of 600 r/min;
and S3, continuously adding the hollow microspheres and the aerogel, stirring for 15min at the rotating speed of 300r/min, and discharging to obtain the external wall heat-insulation middle coating.
The difference from example 1 is that no inorganic polymer powder was added in comparative example 1.
Comparative example 2: the exterior wall heat-insulation middle coating comprises the same raw material components as those in the embodiment 1, and comprises the following preparation steps:
s1, adding water, a thickening agent, a pH regulator, a foaming agent and a foam stabilizer into a stirring kettle, and stirring for 15min at the rotating speed of 500 r/min;
s2, continuously adding inorganic resin, acrylic emulsion, glycol and film-forming auxiliary agent, and stirring for 30min at the rotating speed of 600 r/min;
and S3, continuously adding the inorganic polymer powder and the aerogel, stirring for 15min at the rotating speed of 300r/min, and discharging to obtain the external wall heat-insulating middle coating.
The difference from example 1 is that no cenospheres were added in comparative example 1.
Comparative example 3: the exterior wall heat-insulation middle coating comprises the same raw material components as those in the embodiment 1, and comprises the following preparation steps:
s1, adding water, a thickening agent, a pH regulator, a foaming agent and a foam stabilizer into a stirring kettle, and stirring for 15min at the rotating speed of 500 r/min;
s2, continuously adding inorganic resin, acrylic emulsion, glycol and film-forming auxiliary agent, and stirring for 30min at the rotating speed of 600 r/min;
and S3, continuously adding inorganic polymer powder and hollow microspheres, stirring for 15min at the rotating speed of 300r/min, and discharging to obtain the external wall heat-insulation middle coating.
The difference from example 1 is that no aerogel was added in comparative example 1.
Comparative example 4: the exterior wall heat-insulation middle coating comprises the same raw material components as those in the embodiment 1, and comprises the following preparation steps:
s1, adding water, a thickening agent, a pH regulator, a foaming agent and a foam stabilizer into a stirring kettle, and stirring for 15min at the rotating speed of 500 r/min;
s2, continuously adding the acrylic emulsion, the ethylene glycol and the film-forming auxiliary agent, and stirring for 30min at the rotating speed of 600 r/min;
and S3, continuously adding inorganic polymer powder, hollow microspheres and aerogel, stirring for 15min at the rotating speed of 300r/min, and discharging to obtain the external wall heat-insulation middle coating.
The difference from example 1 is that no inorganic resin was added in comparative example 1.
Performance testing
The performance of the exterior wall thermal insulation middle coatings prepared in the examples 1-8 and the comparative examples 1-4 is respectively tested by adopting a vertical combustion method and a DRX-I-PB (PC) type thermal conductivity tester. The test results are shown in Table 2.
Table 2 results of performance testing
| Test items | Fire rating/grade | Thermal conductivity/0.03W/(m.K) |
| Example 1 | B1 | 0.038 |
| Example 2 | B1 | 0.036 |
| Example 3 | B1 | 0.038 |
| Example 4 | B1 | 0.035 |
| Example 5 | B1 | 0.037 |
| Example 6 | B1 | 0.036 |
| Example 7 | B1 | 0.035 |
| Example 8 | B1 | 0.035 |
| Comparative example 1 | B2 | 0.092 |
| Comparative example 2 | B2 | 0.093 |
| Comparative example 3 | B2 | 0.095 |
| Comparative example 4 | B2 | 0.099 |
As can be seen from the test results in Table 2, the fire-retardant grades of the exterior wall heat-insulating middle coats in the examples 1 to 8 are all B1 grades, the heat conductivity coefficient is 0.035-0.0380.03W/(m.K), and the exterior wall heat-insulating middle coats have good fire resistance and heat-insulating property and good reproducibility; and because the inorganic polymer powder is not added in the comparative example 1, the cenospheres are not added in the comparative example 2, the aerogel is not added in the comparative example 3, and the inorganic resin is not added in the comparative example 4, the fire-proof grade is reduced to B2 grade, the good fire-proof performance is not achieved, the heat conductivity coefficient is also improved to 0.092-0.099W/(m.K), and the heat-insulating performance is obviously deteriorated. In conclusion, the external wall heat-insulation middle coating prepared by the method has the characteristics of outstanding heat-insulation effect and good fireproof performance.
The above description is only a preferred embodiment of the present application, and the protection scope of the present application is not limited to the above embodiments, and all technical solutions belonging to the idea of the present application belong to the protection scope of the present application. It should be noted that several improvements and modifications to the present application without departing from the principles of the present application will occur to those skilled in the art, and such improvements and modifications should also be considered within the scope of the present application.
Claims (8)
1. The heat-insulating intermediate coat for the outer wall is characterized by comprising the following components in percentage by weight:
acrylic emulsion: 8 to 15 percent;
inorganic resin: 25 to 35 percent;
inorganic polymer powder: 10 to 20 percent;
film-forming auxiliary agent: 0.3 to 0.5 percent;
aerogel: 5 to 10 percent;
hollow microspheres: 5 to 10 percent;
thickening agent: 0.5-1%;
foaming agent: 0.3 to 0.5 percent;
foam stabilizer: 0.3 to 0.5 percent;
ethylene glycol: 1 to 1.5 percent;
pH regulator: 0.1 to 0.2 percent;
water: 20 to 30 percent.
2. The exterior wall thermal insulation middle coating according to claim 1, which comprises the following components in percentage by weight:
acrylic emulsion: 11 percent;
inorganic resin: 29 percent;
inorganic polymer powder: 16 percent;
film-forming auxiliary agent: 0.4 percent;
aerogel: 8 percent;
hollow microspheres: 8 percent;
thickening agent: 0.7 percent;
foaming agent: 0.4 percent;
foam stabilizer: 0.4 percent;
ethylene glycol: 1.2 percent;
pH regulator: 0.1 percent;
water: 24.8 percent.
3. The exterior wall thermal insulation middle coating according to claim 1, wherein the inorganic resin is a mixture of water glass and acrylic emulsion, wherein the water glass is one or two of potassium silicate and sodium silicate.
4. The exterior wall thermal insulation middle coating as claimed in claim 1, wherein the inorganic polymer powder is a silicone resin containing Si-O group, and has a thermal conductivity of 0.03-0.04W/(m.K) and a particle size of 180-220 mesh.
5. The exterior wall thermal insulation floating coat according to claim 1, wherein the aerogel is silica aerogel, and the thermal conductivity of the aerogel is 0.02-0.03W/(m-K).
6. The exterior wall thermal insulation middle coating as claimed in claim 1, wherein the cenospheres are selected from one of expanded vitrified microbeads and ultra-light ceramic sand made of fly ash, the thermal conductivity coefficient of the cenospheres is 0.03-0.04W/(m.K), and the particle size is 550-650 meshes.
7. The exterior wall thermal insulation floating coat according to claim 1, wherein the film forming aid is propylene glycol butyl ether.
8. The method for preparing the external wall thermal insulation floating coat according to any one of claims 1 to 7, which is characterized by comprising the following steps:
s1, adding water, a thickening agent, a pH regulator, a foaming agent and a foam stabilizer into a stirring kettle, and stirring at the rotating speed of 500-800r/min for 10-15 min;
s2, continuously adding inorganic resin, acrylic emulsion, glycol and film-forming auxiliary agent, and stirring for 15-30min at the rotating speed of 600-800 r/min;
s3, continuously adding inorganic polymer powder, hollow microspheres and aerogel, stirring for 10-15min at the rotating speed of 300-400r/min, and discharging to obtain the external wall heat-insulating middle coating.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113045915A (en) * | 2021-03-19 | 2021-06-29 | 三棵树(上海)新材料研究有限公司 | Fireproof aerogel heat-preservation and heat-insulation middle coating and preparation method thereof |
| CN116515335A (en) * | 2023-06-06 | 2023-08-01 | 米格（浙江）创新科技有限公司 | Nano ceramic microbead heat-insulating putty and preparation method thereof |
| CN116535909A (en) * | 2023-05-17 | 2023-08-04 | 武汉理工大学 | Silica aerogel water-based paint and preparation method and application thereof |
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| CN113045915A (en) * | 2021-03-19 | 2021-06-29 | 三棵树(上海)新材料研究有限公司 | Fireproof aerogel heat-preservation and heat-insulation middle coating and preparation method thereof |
| CN116535909A (en) * | 2023-05-17 | 2023-08-04 | 武汉理工大学 | Silica aerogel water-based paint and preparation method and application thereof |
| CN116535909B (en) * | 2023-05-17 | 2024-08-13 | 武汉理工大学 | Silica aerogel water-based paint and preparation method and application thereof |
| CN116515335A (en) * | 2023-06-06 | 2023-08-01 | 米格（浙江）创新科技有限公司 | Nano ceramic microbead heat-insulating putty and preparation method thereof |
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