CN110527396B - Aerogel flame-retardant heat-preservation foam type coating with hierarchical pore microstructure and preparation method thereof - Google Patents
Aerogel flame-retardant heat-preservation foam type coating with hierarchical pore microstructure and preparation method thereof Download PDFInfo
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Abstract
The invention provides a preparation method of aerogel flame-retardant heat-preservation foam type coating with a hierarchical pore microstructure, which comprises the steps of dispersing a thickening agent, a curing agent, a foaming agent and reinforcing fibers in a solvent to obtain a thickening solution; mixing the thickening solution with aqueous resin to obtain a mixed solution; and mixing the mixed solution and the aerogel powder to obtain a creamy coating, namely the aerogel flame-retardant heat-preservation foam type coating. The flame-retardant heat-insulation foam type coating prepared by the invention has good sagging and construction performance, can be coated on vertical surfaces or ceilings and the like, and does not need to use adhesives used by heat-insulation boards. The material prepared by the invention has small density (minimum 100 mg/cm)3) Compared with the traditional external thermal insulation material, the material has lower thermal conductivity, and has heat insulation and fire resistance. Meanwhile, the hierarchical pore microstructure, density and mechanical property of the obtained coating can be regulated and controlled by changing the contents of the curing agent, resin, aerogel, reinforcing fiber and the like.
Description
Technical Field
The invention relates to the technical field of materials, in particular to an aerogel flame-retardant heat-preservation foam type coating with a hierarchical pore microstructure and a preparation method thereof.
Background
The heat insulation material is a material with wide application field and great application prospect in engineering, and can permeate into various fields such as national defense and military industry, aerospace, transportation, biomedicine, building engineering and the like. Meanwhile, the lighter and stronger materials can greatly reduce the survival cost of human beings and effectively relieve the requirements of human beings on energy sources on the premise of not influencing the requirements of human beings. At present, the heat insulation materials in the market are mainly EPS, XPS, rock wool and the like. In recent years, EPS and XPS materials often cause high-rise fire due to unreasonable use, or are easily affected by weather, and fall off from the outer wall of a high-rise building, so that serious social accidents are caused. Therefore, by utilizing the nanotechnology, the invention of the low-cost coating with high-efficiency heat-insulating property and flame-retardant property becomes a problem to be solved urgently.
To realize heat insulation on the original building, the external wall external heat insulation system is a very effective means for commercialization. The existing external thermal insulation system of the external wall is generally made of organic thermal insulation materials. The organic heat-insulating material has good properties and low cost, and the adopted industrial waste has certain environmental protection significance. However, the fire-proof property of the product needs to be realized by adding a fire retardant, and the fire retardant is easy to lose; and because rely on between heated board and the wall to bond or pin, drop easily or produce the heat bridge, have the potential safety hazard when high building is used. Aerogel gypsum coatings based on aerogel particles (https:// www.fixit.ch/aerogel/. However, the process requires curing of the coating, and the operability is not as good as that of the organic heat insulating material.
Aerogel is the first choice material of future thermal insulation fire retardant material, on the basis of solving enlarged production, has developed a variety of products. Aerogel has not been a substitute for organic insulation materials, not only is expensive, but also has a complex process and poor mechanics. In recent years, rapid and simple aerogel drying methods, featuring atmospheric drying, have made the production of aerogel powders/granules feasible. More recently, EMPA scientists have actively developed products including aerogel bricks, aerogel wood, and most commonly aerogel blankets. Aerogel materials of low density developed in recent years have a low mechanical modulus although they have a good thermal insulation effect. Compare in traditional outer wall insulation material, the aerogel is fragile, and the block that constitutes by the aerogel granule produces the crackle easily, does not have good adhesion.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide a method for preparing an aerogel flame-retardant thermal insulation foam type coating with a hierarchical pore microstructure, and the aerogel flame-retardant thermal insulation foam type coating prepared by the present invention has characteristics of good water resistance, low thermal conductivity, heat insulation and fire resistance, and adjustable density and mechanical properties.
The invention provides a preparation method of an aerogel flame-retardant heat-preservation foam type coating with a hierarchical pore microstructure, which comprises the following steps:
A) dispersing a thickening agent, a curing agent, a foaming agent and reinforcing fibers in a solvent to obtain a thickening solution;
B) mixing the thickening solution with aqueous resin to obtain a mixed solution;
C) and mixing the mixed solution and the aerogel powder to obtain a creamy coating, namely the aerogel flame-retardant heat-preservation foam type coating with the hierarchical pore microstructure.
Preferably, the thickening agent is selected from one or more of chitosan, sodium alginate, starch and sodium carboxymethyl cellulose; the foaming agent is selected from one or more of whey protein, collagen, casein, silk protein or propionic acid, butyric acid, valeric acid and heptanoic acid; the solvent is water.
Preferably, the curing agent is selected from one or more of formic acid, acetic acid, oxalic acid, tartaric acid, hydrochloric acid and p-toluenesulfonic acid; the reinforced fiber is selected from one or more of glass fiber, carbon fiber, aramid fiber, nylon fiber, sepiolite fiber, carbon nanotube, calcium silicate and hydroxyapatite.
Preferably, the mass ratio of the thickening agent, the curing agent, the foaming agent and the reinforcing fiber to the solvent is (0.5 g-10 g): (0.5 g-5 g): 0.1 g-5 g): 100 ml.
Preferably, the aqueous resin is selected from one or more of epoxy resin, phenolic resin, melamine formaldehyde resin and polyacrylic resin.
Preferably, the mass ratio of the volume of the thickening solution to the aqueous resin is: 100ml (20 g-500 g).
Preferably, the aerogel is selected from one or more of silica aerogel, alumina aerogel, titania aerogel, zirconia aerogel, iron oxide aerogel, cerium oxide aerogel, vanadium oxide aerogel and carbon aerogel; the diameter of the aerogel powder is 0.1-50 μm; the ratio of the mass of the aerogel to the volume of the mixed solution is (5 g-40 g) to 20 ml.
The invention provides an aerogel flame-retardant heat-preservation foam type coating with a hierarchical pore microstructure, which is prepared by the preparation method in any one of the technical schemes.
The invention provides a preparation method of an aerogel flame-retardant heat-preservation foam type coating with a hierarchical pore microstructure, which comprises the following steps:
the aerogel flame-retardant heat-preservation foam type coating prepared by any one of the technical schemes is coated on a substrate, and is cured and dried to obtain the aerogel flame-retardant heat-preservation foam type coating with the hierarchical pore microstructure.
Preferably, the drying is natural drying at room temperature or heating drying; the temperature for heating and drying is 5-80 ℃; the drying time is 3-5 d; the substrate material is metal, inorganic nonmetal or high molecular material.
Compared with the prior art, the invention provides a preparation method of aerogel flame-retardant heat-preservation foam type coating with a hierarchical pore microstructure, which comprises the following steps of A) dispersing a thickening agent, a curing agent, a foaming agent and reinforcing fibers in a solvent to obtain a thickening solution; B) mixing the thickening solution with aqueous resin to obtain a mixed solution; C) and mixing the mixed solution and the aerogel powder to obtain a creamy coating, namely the aerogel flame-retardant heat-preservation foam type coating with the hierarchical pore microstructure. The flame-retardant heat-insulation foam coating prepared by the method has good sagging performance and excellent construction performance, can be coated on vertical surfaces or ceilings, and replaces an adhesive used by a traditional heat-insulation plate by a resin matrix. The material prepared by the method has small density (100-500 mg/cm)3) The heat-insulating and flame-retardant material has excellent heat-insulating and flame-retardant properties, has lower heat conductivity than the traditional external heat-insulating material, and has heat-insulating and fireproof properties. Meanwhile, the grade pore microstructure, density, mechanical property and the like of the obtained coating material can be regulated and controlled by regulating and controlling the content of the curing agent, the content of the water-based resin, the content of the reinforcing fiber and the diameter thereof, the content of the aerogel or the hydrophobicity of the aerogel, so that the requirements of different practical occasions can be met.
Drawings
FIG. 1 is a photograph of an embodiment of the present invention, example 1, in which an aerogel foam-type coating was prepared;
FIG. 2 is a photograph showing contact angle measurements of aerogel foam-type coatings prepared in example 1 of the present invention;
FIG. 3 is a scanning electron micrograph of an aerogel foam coating prepared according to example 1 of the present invention;
FIG. 4 is a scanning electron microscope image of the aerogel foam type coating prepared by etching aerogel particles according to example 1 of the present invention;
FIG. 5 is a scanning electron microscope image of the macro-porous junction after etching aerogel particles with the aerogel foam type coating prepared in example 1 of the present invention;
FIG. 6 is a plot of the pore size distribution of the BET test of an aerogel foam-type coating prepared in accordance with example 1 of the present invention;
FIG. 7 is a graph showing sagging performance of aerogel foam-type coating prepared according to example 1 of the present invention;
FIG. 8 is a scanning electron microscope image of the aerogel particles etched by the aerogel foam coating with different aerogel contents prepared in example 2 of the present invention;
FIG. 9 is a scanning electron microscope image of the aerogel particles etched with aerogel foam coatings of different resin contents prepared in example 3 of the present invention;
FIG. 10 is a compression mechanical test of aerogel foam-type coatings prepared with different resin contents according to example 3 of the present invention;
fig. 11 is a photograph of a flame retardant and insulating aerogel foam-type coating subjected to a burning test on balsa wood in example 4 of the present invention, in comparison with a burning test in which a commercial insulation coating, a commercial intumescent coating, was applied on balsa wood.
Detailed Description
The invention provides an aerogel flame-retardant heat-preservation foam type coating with a hierarchical pore microstructure and a preparation method thereof, and a person skilled in the art can realize the flame-retardant heat-preservation foam type coating by properly improving process parameters by referring to the content. It is expressly intended that all such similar substitutes and modifications apparent to those skilled in the art are deemed to be within the scope of the invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.
The invention provides a preparation method of an aerogel flame-retardant heat-preservation foam type coating with a hierarchical pore microstructure, which comprises the following steps:
A) dispersing a thickening agent, a curing agent, a foaming agent and reinforcing fibers in a solvent to obtain a thickening solution;
B) mixing the thickening solution with aqueous resin to obtain a mixed solution;
C) and mixing the mixed solution and the aerogel powder to obtain a creamy coating, namely the aerogel flame-retardant heat-preservation foam type coating with the hierarchical pore microstructure.
The aerogel flame-retardant heat-preservation foam type coating with the hierarchical pore microstructure provided by the invention is prepared by firstly dispersing a thickening agent, a curing agent, a foaming agent and reinforcing fibers in a solvent and stirring to obtain a thickening solution. The present invention is not limited to the specific operation of dispersing and stirring, and those skilled in the art will be familiar with the operation.
According to the invention, the thickening agent is preferably selected from one or more of chitosan, sodium alginate, starch and sodium carboxymethyl cellulose; more preferably one or more of sodium alginate, starch and sodium carboxymethyl cellulose; most preferably sodium carboxymethylcellulose.
The foaming agent is preferably selected from one or more of whey protein, collagen, casein, silk protein or propionic acid, butyric acid, valeric acid and heptanoic acid; more preferably selected from one or more of whey protein, collagen, casein and silk protein. The solvent is water.
The curing agent is preferably selected from one or more of formic acid, acetic acid, oxalic acid, tartaric acid, hydrochloric acid and p-toluenesulfonic acid; more preferably one or more of formic acid, tartaric acid, hydrochloric acid and p-toluenesulfonic acid; most preferred is p-toluenesulfonic acid.
The reinforcing fiber is preferably selected from one or more of glass fiber, carbon fiber, aramid fiber, nylon fiber, sepiolite fiber, carbon nanotube, calcium silicate and hydroxyapatite.
The reinforcing fiber can assist in supporting the coating structure and improving the rheological property of the resin material.
Wherein the mass ratio of the thickening agent, the curing agent, the foaming agent and the reinforcing fiber to the solvent is preferably (0.5 g-10 g) - (0.5 g-5 g) - (0.1 g-5 g): 100 ml; more preferably (1 g-4 g), (1 g-5 g), (1 g-4 g), (0.1 g-5 g): 100 ml.
Mixing the thickening solution with the water-based resin, and stirring to obtain a mixed solution; and mixing the thickening solutions with different proportions with the water-based resin, and uniformly stirring to obtain a mixed solution. The present invention is not limited to the specific operation of mixing and stirring, and those skilled in the art will be familiar with the operation.
According to the invention, the content of the curing agent, the content of the water-based resin, the content of the reinforcing fiber and the diameter thereof, the content of the aerogel or the hydrophobicity of the aerogel are regulated, and the hierarchical pore microstructure, the density, the mechanical property and the like of the obtained coating material are regulated, so that the requirements of different practical occasions can be met.
According to the invention, the water-based resin is preferably selected from one or more of epoxy resin, phenolic resin, melamine formaldehyde resin and polyacrylic resin; more preferably one or more selected from epoxy resin, phenolic resin and melamine formaldehyde resin; most preferred is melamine formaldehyde resin.
Wherein the mass ratio of the volume of the thickening solution to the aqueous resin is preferably: 100ml (20 g-500 g); more preferably 100ml (40 g-300 g); most preferably 100ml (50 g-200 g).
And mixing the mixed solution and the aerogel powder, and stirring to obtain a creamy coating, namely the aerogel flame-retardant heat-preservation foam type coating with the hierarchical pore microstructure. The present invention is not limited to the specific operation of mixing and stirring, and those skilled in the art will be familiar with the operation. The stirring time is preferably 10-20 min.
According to the present invention, the aerogel is preferably selected from one or more of silica aerogel, alumina aerogel, titania aerogel, zirconia aerogel, iron oxide aerogel, cerium oxide aerogel, vanadium oxide aerogel and carbon aerogel; more preferably one or more selected from the group consisting of silica aerogel, alumina aerogel, titania aerogel, zirconia aerogel and iron oxide aerogel.
Wherein the aerogel powder of the present invention comprises aerogel particles having different degrees of hydrophobicity; the diameter of the aerogel powder is preferably 0.1-50 μm; more preferably 1 to 40 μm; more preferably 10 to 30 μm.
The ratio of the mass of the aerogel to the volume of the mixed solution is preferably (5 g-40 g) to 20 ml; more preferably (8 g-35 g) 20 ml; most preferably (10g to 30g) of 20 ml.
According to the invention, the final coating has a mesoporous structure through the addition of the water-based resin, and the coating has a macroporous structure through the existence of air bubbles. The invention has good performance just because of the existence of the structures of mesopores and macropores, namely the coating with the hierarchical pore microstructure. The performance of high-efficiency heat preservation cannot be realized only by simple composite resin and aerogel materials.
According to the invention, the thickening agent, the curing agent, the foaming agent, the reinforced fiber, the aerogel powder, the water-based resin and the like are sequentially mixed and stirred to prepare the material, so that the process is simple, the technology is mature, and the large-scale production can be realized. The heat-insulating coating with excellent performance can be obtained by directly and naturally drying. The method is simple to operate, good in controllability and capable of realizing large-scale preparation. The prepared coating has good sagging property and can be applied to external wall heat-insulating coatings. The dried flame-retardant heat-insulation coating has low density (100-500 mg/cm)3) The thermal insulation material has no obvious cracking, lower thermal conductivity (27mW/mK) than the traditional thermal insulation material, light weight, high strength, and simultaneously has hydrophobic and flame retardant properties, thermal insulation and fireproof properties. And the hierarchical pore microstructure, density, mechanical property and the like of the obtained coating material can be regulated and controlled by regulating and controlling the content of the curing agent, the content of the water-based resin, the content of the reinforcing fiber and the diameter thereof, the content of the aerogel or the hydrophobicity of the aerogel.
The invention provides an aerogel flame-retardant heat-preservation foam type coating with a hierarchical pore microstructure, which is prepared by the preparation method in any one of the technical schemes.
The invention provides a preparation method of an aerogel flame-retardant heat-preservation foam type coating with a hierarchical pore microstructure, which comprises the following steps:
the aerogel flame-retardant heat-preservation foam type coating prepared by any one of the technical schemes is coated on a substrate, and is cured and dried to obtain the aerogel flame-retardant heat-preservation foam type coating with the hierarchical pore microstructure.
And after the aerogel flame-retardant heat-preservation foam type coating is obtained, coating the coating on a substrate, and curing and drying to obtain the aerogel flame-retardant heat-preservation foam type coating with the hierarchical pore microstructure.
The preparation method of the coating of the invention is clearly described above and is not described in detail herein.
Although the mixed coating has a curing agent, the curing takes time, the mixed coating is coated on a substrate, and the coating is obtained after curing and drying.
Wherein the drying is natural drying at room temperature or heating drying; the drying can be carried out at any humidity, and the temperature of the heating drying is 5-80 ℃; the drying time is 3-5 d; the substrate material is metal, inorganic nonmetal or high molecular material.
The prepared creamy coating has good sagging performance and excellent construction performance, can be coated on vertical surfaces or ceilings and the like, and replaces the adhesive used by the traditional heat-insulating plate by the resin matrix. Meanwhile, the material can be compounded with various flame retardants, wherein the waterproof effect of the hydrophobic aerogel can greatly improve the stability of the flame retardants in the coating, so that the coating with excellent fire resistance and heat insulation performance and good weather resistance is obtained, and the application field of the material is effectively expanded.
The invention provides a preparation method of aerogel flame-retardant heat-preservation foam type coating with a hierarchical pore microstructure, which comprises the following steps of A) dispersing a thickening agent, a curing agent, a foaming agent and reinforcing fibers in a solvent to obtain a thickening solution; B) mixing the thickening solution with aqueous resin to obtain a mixed solution; C) and mixing the mixed solution and the aerogel powder to obtain a creamy coating, namely the aerogel flame-retardant heat-preservation foam type coating with the hierarchical pore microstructure. The invention will enhanceThe fiber, the water-based resin and the aerogel powder are jointly used for preparing the flame-retardant heat-insulation foam type coating, the coating has good sagging performance and excellent construction performance, can be coated on vertical surfaces or ceilings and the like, and replaces an adhesive used by the traditional heat-insulation board with a resin matrix. The material prepared by the method has small density (100-500 mg/cm)3) The heat-insulating and flame-retardant material has excellent heat-insulating and flame-retardant properties, has lower heat conductivity than the traditional external heat-insulating material, and has heat-insulating and fireproof properties. Meanwhile, the grade pore microstructure, density, mechanical property and the like of the obtained coating material can be regulated and controlled by regulating and controlling the content of the curing agent, the content of the water-based resin, the content of the reinforcing fiber and the diameter thereof, the content of the aerogel or the hydrophobicity of the aerogel, so that the requirements of different practical occasions can be met.
In order to further illustrate the present invention, the following will describe in detail an aerogel flame retardant insulation foam type coating with a hierarchical pore microstructure and a preparation method thereof, which are provided by the present invention, with reference to examples. The chemical reagents and equipment used in the examples of the present invention are commercially available.
Example 1
4g of sodium carboxymethylcellulose, 1.25g of p-toluenesulfonic acid and 1g of glass fiber (Shanghai pharmaceutical group) are dispersed in 100ml of deionized water, stirred overnight, and 4g of whey protein is added to obtain a high-viscosity pale yellow solution for later use.
And (3) taking 20ml of the solution into a beaker, adding 10g of commercial melamine formaldehyde resin and 20g of commercial silicon dioxide aerogel powder, and stirring for 10-20 min to obtain the available aerogel foam type coating. Coating the coating on the surface of a PVC plastic pipeline, and drying for 3-5 days to obtain a final coating product, as shown in figure 1. The coating had a pronounced hydrophobicity with a contact angle of 138 ° as shown in fig. 2. The microstructure of the sample is a closed cell foam structure with graded cells, as shown in fig. 3. After the silica aerogel powder particles were etched with NaOH, it can be seen that the macropores were overlapped with each other by the three-dimensional network resin, as shown in fig. 4 and 5.
FIG. 6 is a plot of the pore size distribution of the BET test of an aerogel foam-type coating prepared in accordance with example 1 of the present invention; as can be seen from FIG. 6, the coating has a double mesoporous structure of 8nm and 12nm, and the two mesopores are respectively derived from the three-dimensional network structures of silica aerogel and resin. FIG. 7 is a graph showing sagging performance of aerogel foam-type coating prepared according to example 1 of the present invention; the red dashed line box is the initial position of the coating, and it can be seen from fig. 7 that the coating does not have severe sagging phenomenon under the condition of thick coating during the drying process, indicating that the coating has good sagging performance.
Example 2
4g of sodium carboxymethylcellulose, 1.25g of p-toluenesulfonic acid and 1g of glass fiber (Shanghai pharmaceutical group) are dispersed in 100ml of deionized water, stirred overnight, and 4g of whey protein is added to obtain a high-viscosity pale yellow solution for later use.
And (3) putting 20ml of the solution into a beaker, adding 10g of commercial melamine formaldehyde resin, respectively adding 5g, 10g, 15 g and 20g of commercial silica aerogel powder, and stirring for 10-20 min to obtain the available aerogel foam type coating. And drying for 3-5 days to obtain the final coating product, wherein the microstructure is shown in figure 8. As can be seen from fig. 8, the content of aerogel affects the size of the cells.
Example 3
4g of sodium carboxymethylcellulose, 1.25g of p-toluenesulfonic acid and 1g of glass fiber (Shanghai pharmaceutical group) are dispersed in 100ml of deionized water, stirred overnight, and 4g of whey protein is added to obtain a high-viscosity pale yellow solution for later use.
And (3) putting 20ml of the solution into a beaker, adding 12 g, 16 g, 20g and 24g of commercial melamine formaldehyde resin and 20g of commercial silicon dioxide aerogel powder, and stirring for 10-20 min to obtain the available aerogel foam type coating. And drying for 3-5 days to obtain the final coating product. The microstructure of the sample is shown in fig. 9.
FIG. 10 is a compression mechanical test of aerogel foam-type coatings prepared with different resin contents according to example 3 of the present invention; as can be seen from FIG. 10, the compressive strength of the aerogel coating with low resin content is greater than 0.4MPa, which is 2-3 times that of the commercial extruded sheet; when the resin content is increased (MF-24/SA-3), the strength and modulus are greatly improved. As can be seen from fig. 9, when the resin content is small, the cell structure is affected by capillary force upon drying, resulting in cell shrinkage.
Example 4
4g of sodium carboxymethylcellulose, 1.25g of p-toluenesulfonic acid and 1g of glass fiber (Shanghai pharmaceutical group) are dispersed in 100ml of deionized water, stirred overnight, and 4g of whey protein is added to obtain a high-viscosity pale yellow solution for later use.
And (3) taking 20ml of the solution into a beaker, adding 10% of flame retardant material, 10g of commercial melamine formaldehyde resin and 20g of commercial silicon dioxide aerogel powder, and stirring for 10-20 min to obtain the available aerogel foam type coating. As shown in FIG. 11, the paint was applied to Barsha wood, dried for 3-5 days, and then the sample was burned on an alcohol burner for 4min for observation. Compared with the combustion test of the balsa wood coated with the commercial thermal insulation coating and the commercial intumescent fire-retardant coating, the samples coated with the aerogel foam type coating have no obvious flame spread phenomenon except the surface carbonization, which shows that the flame retardant property of the material is excellent. Meanwhile, the thermal conductivity values of the aerogel coating obtained by the thermal flow method are shown in table 1.
Table 1 shows the thermal conductivity values obtained by the thermal flow method test of the aerogel coating in example 4 of the present invention.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. The preparation method of the aerogel flame-retardant heat-preservation foam type coating with the hierarchical pore microstructure is characterized by comprising the following steps of:
A) dispersing a thickening agent, a curing agent, a foaming agent and reinforcing fibers in a solvent to obtain a thickening solution; the reinforcing fiber is selected from one or more of glass fiber, carbon fiber, aramid fiber, nylon fiber, sepiolite fiber, carbon nano tube, calcium silicate and hydroxyapatite; the mass ratio of the thickening agent, the curing agent, the foaming agent and the reinforcing fiber to the solvent is (0.5 g-10 g), (0.5 g-5 g), (0.1 g-5 g) and (0.1 g-5 g): 100 mL; the thickening agent is selected from one or more of chitosan, sodium alginate, starch and sodium carboxymethyl cellulose; the foaming agent is selected from one or more of whey protein, collagen, casein and silk protein; the solvent is water;
B) mixing the thickening solution with aqueous resin to obtain a mixed solution;
C) and mixing the mixed solution and the aerogel powder to obtain a creamy coating, namely the aerogel flame-retardant heat-preservation foam type coating with the hierarchical pore microstructure.
2. The method according to claim 1, wherein the curing agent is one or more selected from formic acid, acetic acid, oxalic acid, tartaric acid, hydrochloric acid and p-toluenesulfonic acid.
3. The preparation method according to claim 1, wherein the aqueous resin is one or more selected from epoxy resin, phenolic resin, melamine formaldehyde resin and polyacrylic resin.
4. The method according to claim 1, wherein the volume of the thickening solution and the mass ratio of the aqueous resin are: 100mL (20 g-500 g).
5. The preparation method according to claim 1, wherein the aerogel is selected from one or more of silica aerogel, alumina aerogel, titania aerogel, zirconia aerogel, iron oxide aerogel, cerium oxide aerogel, vanadium oxide aerogel and carbon aerogel; the diameter of the aerogel powder is 0.1-50 μm; the ratio of the mass of the aerogel to the volume of the mixed solution is (5 g-40 g):20 mL.
6. An aerogel flame-retardant heat-preservation foam type coating with a hierarchical pore microstructure, which is characterized by being prepared by the preparation method of any one of claims 1-5.
7. A preparation method of an aerogel flame-retardant heat-preservation foam type coating with a hierarchical pore microstructure is characterized by comprising the following steps:
the aerogel flame-retardant insulation foam type coating of any one of claims 1 to 5 is coated on a substrate, and is cured and dried to obtain the aerogel flame-retardant insulation foam type coating with the hierarchical pore microstructure.
8. The method according to claim 7, wherein the drying is natural drying at room temperature or heating drying; the temperature for heating and drying is 5-80 ℃; the drying time is 3-5 d; the substrate material is metal, inorganic nonmetal or high molecular material.
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| 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 |
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