An alumina ceramic fiber board with a fireproof and heat-insulating function and covered with a nano-ceramic film

Abstract

The present invention relates to the field of ceramic technology, and more specifically, to an alumina ceramic fiber board with a fireproof and heat-insulating function and a nano-ceramic coating, which sequentially includes a nano-ceramic coating and an alumina ceramic fiber board from top to bottom; for the nano-ceramic coating, calculated by mass, the raw materials include: 50-70 parts of an adhesive, 10-20 parts of hydroxylated layered Ti3C2 / silica hollow spheres / ceramic particles, 0.1-0.5 parts of 2-acrylamido-2-methylpropanesulfonic acid sodium salt, 0.01-0.1 parts of an initiator, and 10-20 parts of water; the present invention solves the problem that the ceramic fiber board in the prior art cannot meet the fireproof and heat-insulating properties required for ceramic fiber boards in the construction field, and at the same time has excellent adhesion, corrosion resistance, strength, antibacterial property, and hydrophobic and oleophobic properties.

Description

Technical Field

[0001] The present invention relates to the technical field of ceramics, and more specifically, to an alumina ceramic fiber board with a fireproof and heat-insulating function and covered with a nano-ceramic film. Background Art

[0002] Ceramic fiber is a high-temperature resistant fiber. Due to its characteristics such as low bulk density, high temperature resistance, good thermal stability and good chemical stability, it is widely used not only in the fields of automobile manufacturing, aerospace, furnaces, etc., but also in the construction field. For example, the Chinese patent with the publication number CN101081742A in the prior art discloses a ceramic fiber building fireproof board. This technical solution uses aluminosilicate fiber or lightweight refractory filler as the base material, adds one or more reinforcing fibers, and adds an appropriate proportion of organic binder or inorganic binder, filler and additive, and is made through processes such as batching and pulping, forming, drying and subsequent processing. The product obtained by this technical solution can effectively improve the fire protection grade, fire resistance limit, heat insulation performance and strength of the building heat insulation board, and greatly reduce the bulk density. However, the aluminosilicate fiber ceramic board is prone to cracking when subjected to impact or bending. The Chinese patent with the authorization announcement number CN117069506B discloses a preparation process of a heat-insulating and noise-reducing ceramic fiber board; the heat-insulating and noise-reducing ceramic fiber board is made of the following raw materials in parts by weight: 50-60 parts of ceramic fiber material, 8-12 parts of the first functional agent, 10-14 parts of the second functional agent, 6-10 parts of filler, 15-25 parts of flocculant, 5-8 parts of binder and 25-35 parts of deionized water; the preparation process of the heat-insulating and noise-reducing ceramic fiber board provided by this technical solution can effectively reduce the thermal conductivity of the prepared ceramic fiber board to improve the heat insulation effect of the ceramic fiber board, and can also promote the noise reduction effect; moreover, it also has excellent flame retardant effect. However, this technical solution uses quartz fiber as the main component, and its heat insulation performance at high temperature needs to be improved. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the present invention aims to provide an alumina ceramic fiber board with a fireproof and heat-insulating function and covered with a nano-ceramic film, to solve the problem that the ceramic fiber board in the prior art cannot meet the fireproof and heat-insulating properties required for the ceramic fiber board in the construction field, and at the same time has excellent adhesion, corrosion resistance, strength, antibacterial property and hydrophobic and oleophobic properties.

[0004] To achieve the above object, the present invention provides an alumina ceramic fiber board with a fireproof and heat-insulating function covered with a nano-ceramic film, which sequentially includes a nano-ceramic film and an alumina ceramic fiber board from top to bottom; for the nano-ceramic film, calculated by mass, the raw materials include: 50-70 parts of an adhesive, 10-20 parts of hydroxylated layered Ti3C2 / silica hollow spheres / ceramic particles, 0.1-0.5 parts of 2-acrylamido-2-methylpropanesulfonic acid sodium salt, 0.01-0.1 parts of an initiator, and 10-20 parts of water;

[0005] The preparation method of the hydroxylated layered Ti3C2 / silica hollow spheres / ceramic particles includes the following steps: ultrasonically disperse hydroxylated layered Ti3C2, silica hollow spheres, and ceramic particles in water respectively to obtain a hydroxylated layered Ti3C2 solution, a silica hollow sphere solution, and a ceramic particle solution, mix the hydroxylated layered Ti3C2 solution and the silica hollow sphere solution, continuously stir at 40-70 °C for 6-10 h, add the ceramic particle solution, and continue to stir for 3-6 h, and obtain the hydroxylated layered Ti3C2 / silica hollow spheres / ceramic particles after cooling, filtering, and drying.

[0006] Due to its good heat-insulating performance, the alumina ceramic fiber board has a wide range of application fields. However, when it is applied in buildings, because pollutants such as sulfides and nitrides in the air react with water and oxygen to form acidic substances, and the pH value of rainwater is either high or low, the surface structure of the alumina fiber board is damaged, reducing the heat-insulating performance. To solve the above problems, the inventor of the present invention tried to cover the surface of the alumina fiber board and found that when introducing hydroxylated layered Ti3C2 / silica hollow spheres / ceramic particles, the alumina ceramic fiber board not only has excellent corrosion resistance but also further improves its heat-insulating performance. At the same time, the stability of the nano-ceramic film is also improved. The inventor guesses that it is because the silica hollow spheres are attached to the surface of the hydroxylated layered Ti3C2 through hydrogen bond interaction, and the ceramic particles are filled between the lamellae of the hydroxylated layered Ti3C2, playing a supporting role, thus avoiding the aggregation and stacking between the lamellae and particles of the hydroxylated layered Ti3C2, enabling the hydroxylated layered Ti3C2 / silica hollow spheres / ceramic particles to form a firm physical bond and binding force on the alumina ceramic fiber board, improving the adhesion of the nano-ceramic film; at the same time, the hydroxylated layered Ti3C2 / silica hollow spheres / ceramic particles with this structure enable the nano-ceramic film to effectively resist the erosion of corrosive media and improve the heat-insulating performance of the alumina ceramic fiber board by blocking the heat conduction through the nano-ceramic film.

[0007] Preferably, the raw materials of the hydroxylated layered Ti3C2 / silica hollow spheres / ceramic particles include hydroxylated layered Ti3C2, silica hollow spheres and ceramic particles; the mass ratio of the hydroxylated layered Ti3C2, silica hollow spheres and ceramic particles is (40-60):(2-5):(20-30).

[0008] Preferably, the silica hollow spheres are silica hollow spheres without mesoporous structure.

[0009] Preferably, the ceramic particles include alumina with a particle size of 100-300 nm, silicon carbide with a particle size of 30-80 nm and zirconia with a particle size of 20-60 nm, and the mass ratio of the three is (10-15):(3-6):(2-4).

[0010] Preferably, the concentration of the hydroxylated layered Ti3C2 solution is 15-30 mg / mL; the concentration of the silica hollow sphere solution is 100-150 mg / mL; the concentration of the ceramic particle solution is 100-150 mg / mL.

[0011] Preferably, the preparation method of the binder includes the following steps:

[0012] S1. Mix chitosan and water evenly to obtain a chitosan solution; mix the moutan cortex extract and water evenly to obtain a moutan cortex extract solution; mix the chitosan solution and the moutan cortex extract solution according to a mass ratio of (2-3):1, and stir at 40-50 °C for 30-50 min to obtain a chitosan / moutan cortex extract complex;

[0013] S2. Mix water, sodium dodecylbenzenesulfonate and monomers, and add ammonium persulfate to obtain an acrylate emulsion; the monomers include tridecafluorooctyl methacrylate, acrylate monomers and acrylic acid;

[0014] S3. Mix the chitosan / moutan cortex extract complex and the acrylate emulsion evenly to obtain the binder; the mass ratio of the chitosan / moutan cortex complex and the acrylate emulsion is (5-8):1.

[0015] For the alumina ceramic fiber board used in construction, there is also a problem that molds are likely to reproduce in a humid environment, resulting in pollution or discoloration of the alumina ceramic fiber board. To solve this problem, the inventor introduced a chitosan / moutan cortex extract complex and an acrylate emulsion in the preparation process of the binder. It was unexpectedly found that while the chitosan / moutan cortex extract complex exerts antibacterial properties, it forms a protective film on the surface of the acrylate emulsion, reducing the adsorption and penetration of oil. Through the synergistic effect of the two, not only the reproduction of molds on the surface of the alumina ceramic fiber board is avoided, but also the nano-ceramic coating film has good hydrophobic and oleophobic effects, thereby avoiding the adhesion of water or oil on the surface of the alumina ceramic fiber board.

[0016] However, since tridecafluorooctyl methacrylate is introduced in the preparation process of the acrylate emulsion of the present invention, the adhesion between the nano-ceramic coating film and the alumina ceramic fiber board decreases. To solve the above problems, the inventor of the present invention found that when 2-acrylamido-2-methylpropanesulfonic acid sodium salt is introduced, it can further make the hydroxylated layered Ti3C2 / silica hollow spheres / ceramic particles uniformly dispersed in the binder, and can react with the binder, especially can react with tridecafluorooctyl methacrylate, avoiding the excessive hardness of the nano-ceramic coating film, thereby improving the adhesion between the nano-ceramic coating film and the alumina ceramic fiber board, and it can further improve the hydrophobic and oleophobic effects of the nano-ceramic coating film.

[0017] Preferably, the mass ratio of the tridecafluorooctyl methacrylate, acrylate monomer, and acrylic acid is (1-3):(8-12):(4-6).

[0018] Preferably, the mass ratio of the water, sodium dodecylbenzenesulfonate, monomer, and initiator is (40-60):(2-5):(20-30):(0.1-1).

[0019] Preferably, the acrylate monomer includes methyl acrylate and ethyl acrylate, and the mass ratio of the two is (1-3):(1-3).

[0020] Preferably, the mass ratio of the chitosan to the water is 1:(20-30); the mass ratio of the cortex moutan extract to the water is 1:(20-30).

[0021] Preferably, the initiator is selected from at least one of ammonium persulfate and potassium persulfate.

[0022] Preferably, the preparation method of the nano-ceramic coating film includes the following steps: mixing the binder and water evenly, adding the hydroxylated layered Ti3C2 / silica hollow spheres / ceramic particles, 2-acrylamido-2-methylpropanesulfonic acid sodium salt, and the initiator to obtain a mixture, sanding the mixture to obtain a slurry, and coating the slurry on the alumina ceramic fiber board and heating and curing to obtain the nano-ceramic coating film.

[0023] Preferably, the temperature of the heating and curing is 40-60°C, and the time is 20-40 min.

[0024] Preferably, the thickness of the nano-ceramic coating film is 40-60 μm.

[0025] Preferably, the preparation method of the alumina ceramic fiber board includes the following steps:

[0026] Step 1: Take water and sodium silicate, mix them evenly, then add phosphoric acid to adjust the pH of the system to 3 to obtain a sodium silicate solution; take water and aluminum sulfate, mix them evenly to obtain an aluminum sulfate solution; take water, ethanol and zirconium hydroxide, mix them evenly, then add hydrogen peroxide, and then add ammonia water to adjust the pH of the system to 3 to obtain a zirconium hydroxide solution; mix the sodium silicate solution, zirconium hydroxide solution and aluminum sulfate solution, and stir at 60 - 80 °C for 4 - 6 h to obtain an inorganic binder;

[0027] Step 2: Mix alumina fibers and the inorganic binder, then perform flocculation and dispersion, and obtain a green body of an alumina ceramic fiber board after dehydration and forming;

[0028] Step 3: Dry and calcine the green body of the alumina ceramic fiber board to obtain the alumina ceramic fiber board.

[0029] Preferably, the thickness of the alumina ceramic fiber board is 5 - 8 mm.

[0030] Preferably, the mass ratio of water to sodium silicate is (1 - 1.2):1.

[0031] Preferably, the mass ratio of water to aluminum sulfate is (50 - 60):1.

[0032] Preferably, the mass ratio of water, ethanol, zirconium hydroxide and hydrogen peroxide is (1.5 - 2):(1.5 - 2):1:(1.2 - 1.5).

[0033] Preferably, the mass ratio of the sodium silicate solution, zirconium hydroxide solution and aluminum sulfate solution is 1:1:(2 - 4).

[0034] Preferably, the mass ratio of the alumina fibers to the inorganic binder is 1:(6 - 10).

[0035] Preferably, in the alumina fibers, Al₂O₃ ≥ 89%, the diameter of the alumina fibers is 9 - 12 μm, the bundle strength of the alumina fibers is 1.9 - 3.0 GPa, and the modulus of the alumina fibers is 300 - 360 GPa.

[0036] Preferably, the drying temperature is 90 - 110 °C and the time is 5 - 7 h; the calcination temperature is 1200 - 1500 °C.

[0037] Aluminum oxide fiber board, with a maximum service temperature of 1600 °C, has excellent fire resistance / fireproof performance and good heat insulation performance, so it has a wide range of application prospects. However, in the production process of existing aluminum oxide fiber boards, organic binders or a combination of organic and inorganic binders are usually used. Organic binders usually decompose or burn at high temperatures, resulting in a decline in the high-temperature fireproof performance of aluminum oxide fiber boards. To solve this problem, through a large number of creative experiments, the inventor found that an inorganic binder prepared by selecting sodium silicate solution, zirconium hydroxide solution, and aluminum sulfate solution not only improves the strength of the aluminum oxide fiber board but also has excellent fireproof performance. The inventor speculates that on the one hand, the volume shrinkage rate of the prepared inorganic binder after thermal decomposition is small, and it can still maintain a high bonding strength at high temperatures. At the same time, the thermal decomposition products, silicon dioxide, zirconium oxide, and aluminum oxide, are also ceramic materials, which are dispersed in the aluminum oxide fibers, further enhancing the strength of the aluminum oxide fiber board and avoiding a decline in the fireproof performance of the aluminum oxide fiber board.

[0038] Preferably, the preparation method of the alumina ceramic fiber board with a fireproof and heat-insulating function coated with nano-ceramics includes the following steps: preparing an alumina ceramic fiber board, and then preparing a nano-ceramic coating to obtain it.

[0039] Beneficial effects

[0040] 1. When introducing hydroxylated layered Ti3C2 / silica hollow spheres / ceramic particles in the present invention, the alumina ceramic fiber board not only has excellent corrosion resistance but also further improves its heat insulation performance. At the same time, the stability of the nano-ceramic coating is also improved.

[0041] 2. In the preparation process of the binder in the present invention, chitosan / moutan cortex extract complex and acrylate emulsion are introduced. It is unexpectedly found that while the chitosan / moutan cortex extract complex exerts its antibacterial performance, it forms a protective film on the surface of the acrylate emulsion, reducing the adsorption and penetration of grease. Through the synergistic effect of the two, not only the reproduction of molds on the surface of the alumina ceramic fiber board is avoided, but also the nano-ceramic coating has a good hydrophobic and oleophobic effect, thereby avoiding the adhesion of water or grease on the surface of the alumina ceramic fiber board.

[0042] 3. When introducing 2-acrylamido-2-methylpropanesulfonic acid sodium in the present invention, it can not only further evenly disperse hydroxylated layered Ti3C2 / silica hollow spheres / ceramic particles in the binder, but also react with the binder, especially with tridecafluorooctyl methacrylate, avoiding excessive hardness of the nano-ceramic coating, thereby improving the adhesion between the nano-ceramic coating and the alumina ceramic fiber board. Moreover, it can further improve the hydrophobic and oleophobic effect of the nano-ceramic coating.

[0043] 4. The inorganic binder prepared by selecting sodium silicate solution, zirconium oxychloride solution and aluminum sulfate solution in the present invention not only improves the strength of the alumina fiber board, but also has excellent fireproof performance. Description of the Drawings

[0044] Figure 1 It is a schematic structural diagram of an alumina ceramic fiber board with a fireproof and heat-insulating function and a nano-ceramic coating in Example 1 of the present invention. In the figure: 1 is the nano-ceramic coating, and 2 is the alumina ceramic fiber board. Detailed Embodiments

[0045] In order to better explain the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the examples in the embodiments of the present invention. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention. The experimental methods in the following embodiments are all conventional methods unless otherwise specified. The materials, reagents, etc. used in the following embodiments and comparative examples can be obtained from commercial channels unless otherwise specified, where:

[0046] The hydroxylated layered Ti3C2 was purchased from Nanjing Jicang Nano Technology Co., Ltd.;

[0047] The silica hollow spheres without mesoporous structure were purchased from Beijing Beike New Materials Technology Co., Ltd.;

[0048] The alumina with a particle size of 200 nm was purchased from Guangzhou Hongwu Materials Technology Co., Ltd.;

[0049] The silicon carbide with a particle size of 50 nm was purchased from Guangzhou Hongwu Materials Technology Co., Ltd.;

[0050] The zirconia with a particle size of 40 ± 10 nm was purchased from Guangzhou Hongwu Materials Technology Co., Ltd.;

[0051] The chitosan was purchased from Shanghai Maokang Biotechnology Co., Ltd.;

[0052] The Cortex Moutan extract was purchased from Xi'an Zhancun Biotechnology Co., Ltd.;

[0053] The 2-acrylamido-2-methylpropanesulfonic acid sodium salt was purchased from Guangzhou Yuejia Trading Co., Ltd.;

[0054] The nonylphenol polyoxyethylene ether was purchased from Guangzhou Yuejia Trading Co., Ltd., model: wetting and emulsifying agent CO-630;

[0055] The alumina fiber was purchased from Molun (Zhuhai) New Materials Technology Co., Ltd., model: Molun 996;

[0056] Tridecafluorooctyl methacrylate CAS: 2144-53-8;

[0057] Acrylic acid CAS: 79-10-7;

[0058] Methyl acrylate CAS: 96-33-3;

[0059] Ethyl acrylate CAS: 140-88-5;

[0060] Sodium dodecylbenzenesulfonate CAS: 25155-30-0;

[0061] Ammonium persulfate CAS: 7727-54-0;

[0062] Sodium silicate CAS: 1344-09-8;

[0063] Aluminum sulfate CAS: 10043-01-3;

[0064] Zirconium oxychloride CAS: 13520-92-8.

[0065] Example 1

[0066] A nano-ceramic-coated alumina ceramic fiber board with fireproof and heat-insulating functions, as Figure 1 shown, from top to bottom, successively includes a nano-ceramic coating 1 and an alumina ceramic fiber board 2; for the nano-ceramic coating 1, calculated by mass, the raw materials include: 60 parts of binder, 15 parts of hydroxylated layered Ti3C2 / silica hollow spheres / ceramic particles, 0.3 part of 2-acrylamido-2-methylpropanesulfonic acid sodium salt, 0.05 part of initiator, and 15 parts of water;

[0067] The preparation method of the hydroxylated layered Ti3C2 / silica hollow spheres / ceramic particles includes the following steps: ultrasonically disperse hydroxylated layered Ti3C2, silica hollow spheres, and ceramic particles in water respectively to obtain a hydroxylated layered Ti3C2 solution, a silica hollow sphere solution, and a ceramic particle solution, mix the hydroxylated layered Ti3C2 solution and the silica hollow sphere solution, continuously stir at 50 °C for 8 h, add the ceramic particle solution, and continue to stir for 5 h, and obtain the hydroxylated layered Ti3C2 / silica hollow spheres / ceramic particles after cooling, filtering, and drying.

[0068] The raw materials of the hydroxylated layered Ti3C2 / silica hollow spheres / ceramic particles include hydroxylated layered Ti3C2, silica hollow spheres, and ceramic particles; the mass ratio of the hydroxylated layered Ti3C2, silica hollow spheres, and ceramic particles is 50:3:25.

[0069] The silica hollow spheres are silica hollow spheres without mesoporous structure.

[0070] The ceramic particles include alumina with a particle size of 200 nm, silicon carbide with a particle size of 50 nm, and zirconia with a particle size of 40 ± 10 nm, and the mass ratio of the three is 12:5:3.

[0071] The concentration of the hydroxylated layered Ti3C2 solution is 20 mg / mL; the concentration of the silica hollow sphere solution is 120 mg / mL; the concentration of the ceramic particle solution is 120 mg / mL.

[0072] The preparation method of the binder includes the following steps:

[0073] S1. Mix chitosan and water evenly to obtain a chitosan solution; mix the cortex moutan extract and water evenly to obtain a cortex moutan extract solution; mix the chitosan solution and the cortex moutan extract solution according to a mass ratio of 3:1, and stir at 45 °C for 40 min to obtain a chitosan / cortex moutan extract complex;

[0074] S2. Mix water, sodium dodecylbenzenesulfonate, and monomers, and add ammonium persulfate to obtain an acrylate emulsion; the monomers include tridecafluorooctyl methacrylate, acrylate monomers, and acrylic acid;

[0075] S3. Mix the chitosan / cortex moutan extract complex and the acrylate emulsion evenly to obtain the binder; the mass ratio of the chitosan / cortex moutan complex to the acrylate emulsion is 6:1.

[0076] The mass ratio of the tridecafluorooctyl methacrylate, acrylate monomers, and acrylic acid is 2:10:5.

[0077] The mass ratio of the water, sodium dodecylbenzenesulfonate, monomers, and initiator is 50:4:25:0.3.

[0078] The acrylate monomers include methyl acrylate and ethyl acrylate, and the mass ratio of the two is 1:1.

[0079] The mass ratio of the chitosan to the water is 1:25; the mass ratio of the cortex moutan extract to the water is 1:25.

[0080] The initiator is ammonium persulfate.

[0081] The preparation method of the nano-ceramic coating 1 includes the following steps: Mix the binder and water evenly, add hydroxylated layered Ti3C2 / silica hollow sphere / ceramic particles, 2-acrylamido-2-methylpropanesulfonic acid, and an initiator to obtain a mixture, grind the mixture to obtain a slurry, and coat the slurry on the alumina ceramic fiber board 2 and heat and cure at 60 °C for 30 min to obtain the nano-ceramic coating 1.

[0082] The thickness of the nano-ceramic coating 1 is 50 μm.

[0083] The preparation method of the alumina ceramic fiber board 2 includes the following steps:

[0084] Step 1: Take water and sodium silicate, mix them evenly, then add phosphoric acid to adjust the pH of the system to 3 to obtain a sodium silicate solution; take water and aluminum sulfate, mix them evenly to obtain an aluminum sulfate solution; take water, ethanol and zirconium hydroxide, mix them evenly, then add hydrogen peroxide, and then add ammonia water to adjust the pH of the system to 3 to obtain a zirconium hydroxide solution; mix the sodium silicate solution, zirconium hydroxide solution and aluminum sulfate solution, and stir at 70 °C for 5 h to obtain an inorganic binder;

[0085] Step 2: Mix the alumina fiber and the inorganic binder, then perform flocculation and dispersion, and obtain a green body of the alumina ceramic fiber board 2 after dehydration and forming;

[0086] Step 3: Dry and calcine the green body of the alumina ceramic fiber board 2 to obtain the alumina ceramic fiber board 2.

[0087] The thickness of the alumina ceramic fiber board 2 is 6 mm.

[0088] The mass ratio of the water to the sodium silicate is 1.1:1.

[0089] The mass ratio of the water to the aluminum sulfate is 55:1.

[0090] The mass ratio of the water, ethanol, zirconium hydroxide and hydrogen peroxide is 1.8:1.8:1:1.4.

[0091] The mass ratio of the sodium silicate solution, zirconium hydroxide solution and aluminum sulfate solution is 1:1:3.

[0092] The mass ratio of the alumina fiber to the inorganic binder is 1:8.

[0093] In the alumina fiber, Al2O3 ≥ 89%, the diameter of the alumina fiber is 10.5 ± 1.5 μm, the bundle strength of the alumina fiber is 2.7 ± 0.3 GPa, and the modulus of the alumina fiber is 330 ± 30 GPa.

[0094] The drying temperature is 100 °C and the time is 6 h; the calcination temperature is 1500 °C.

[0095] The preparation method of the alumina ceramic fiber board with a fireproof and heat-insulating function and a nano-ceramic coating includes the following steps: prepare the alumina ceramic fiber board 2, and then prepare the nano-ceramic coating 1 to obtain it.

[0096] Example 2

[0097] The difference from Example 1 is that for the nano-ceramic coating film, calculated by mass parts, the raw materials include: 50 parts of binder, 10 parts of hydroxylated layered Ti3C2 / silica hollow spheres / ceramic particles, 0.1 part of 2-acrylamido-2-methylpropanesulfonic acid sodium salt, 0.01 part of initiator, and 10 parts of water.

[0098] Example 3

[0099] The difference from Example 1 is that for the nano-ceramic coating film, calculated by mass parts, the raw materials include: 70 parts of binder, 20 parts of hydroxylated layered Ti3C2 / silica hollow spheres / ceramic particles, 0.4 part of 2-acrylamido-2-methylpropanesulfonic acid sodium salt, 0.05 part of initiator, and 20 parts of water.

[0100] Comparative Example 1

[0101] The difference from Example 1 is that hydroxylated layered Ti3C2, silica hollow spheres and ceramic particles are directly mixed at a mass ratio of 50:3:25, and the rest are the same.

[0102] Comparative Example 2

[0103] The difference from Example 1 is that only acrylate emulsion exists in the binder, and the rest are the same.

[0104] Comparative Example 3

[0105] The difference from Example 1 is that only chitosan / moutan cortex extract complex exists in the binder, and the rest are the same.

[0106] Comparative Example 4

[0107] The difference from Example 1 is that 2-acrylamido-2-methylpropanesulfonic acid sodium salt is replaced by nonylphenol polyoxyethylene ether, and the rest are the same.

[0108] Comparative Example 5

[0109] The difference from Example 1 is that sodium silicate solution is replaced by an equal mass of aluminum sulfate solution, and the rest are the same.

[0110] Comparative Example 6

[0111] The difference from Example 1 is that zirconium oxychloride solution is replaced by an equal mass of sodium silicate solution, and the rest are the same.

[0112] Comparative Example 7

[0113] The difference from Example 1 is that aluminum sulfate solution is replaced by an equal mass of sodium silicate solution, and the rest are the same.

[0114] Test Example: The alumina ceramic fiber boards with fireproof and heat-insulating functions covered with nano-ceramics obtained in Examples 1-3 and Comparative Examples 1-7 were tested as follows:

[0115] 1. Adhesion: Evaluate the adhesion of the nano-ceramic coating according to the impact resistance in AAMA2605-05 7.5. If the nano-ceramic coating does not peel off, it is recorded as qualified; otherwise, it is unqualified.

[0116] 2. Fire resistance: Determine according to the specified method in JG / T564-2018 "Ceramic Fiber Fireproof Boards for Building Use";

[0117] 3. Heat insulation: Measure the thermal conductivity according to the standard test method for thermal conductivity of refractories ASTM-C201-1993;

[0118] 4. Corrosion resistance: Determine according to the neutral salt spray test in GB / T 10125-2012; after 1000 hours of salt spray test, if there is no corrosion phenomenon on the nano-ceramic coating, it is recorded as qualified; otherwise, it is unqualified;

[0119] 5. Strength: Determine the compressive strength according to the regulations in GB / T 5072-2006 "Test Method for Cold Crushing Strength of Refractories";

[0120] 6. Bacteriostasis: Determine according to the specified method in JC / T 2039-2010;

[0121] 7. Hydrophobic and oleophobic properties: Determine according to the specified method in GB / T 26490-2011 "Test Method for Superhydrophobic and Superoleophobic Properties of Nanomaterials".

[0122] Table 1 Performance test results of alumina ceramic fiber boards with fireproof and heat-insulating functions covered with nano-ceramics in Examples 1-3 and Comparative Examples 1-7

[0123]

[0124] As can be seen from Table 1: The alumina ceramic fiber boards with fireproof and heat-insulating functions covered with nano-ceramics in Examples 1-3 all have good adhesion, fire resistance, heat insulation, corrosion resistance, strength, bacteriostasis and hydrophobic and oleophobic properties;

[0125] In Comparative Example 1, since the hydroxylated layered Ti3C2, silica hollow spheres and ceramic particles were directly mixed in a mass ratio of 50:3:25 and did not form a composite, the adhesion and corrosion resistance of the obtained alumina ceramic fiber board were unqualified, and the heat insulation, strength and hydrophobic and oleophobic properties all decreased;

[0126] In Comparative Example 2, the absence of the chitosan / moutan bark extract complex in the binder led to a decrease in the antibacterial property of the obtained alumina ceramic fiber board, and a relatively large decrease in the hydrophobic and oleophobic properties;

[0127] In Comparative Example 3, the absence of the acrylate emulsion in the binder caused the obtained alumina ceramic fiber board to lose its hydrophobic and oleophobic properties;

[0128] In Comparative Example 4, the replacement of 2-acrylamido-2-methylpropanesulfonic acid sodium salt with nonylphenol polyoxyethylene ether led to unqualified adhesion of the obtained alumina ceramic fiber board, and a decrease in both strength and hydrophobic and oleophobic properties;

[0129] In Comparative Example 5, the sodium silicate solution was replaced with an equal mass of aluminum sulfate solution; in Comparative Example 6, the zirconium hydroxide solution was replaced with an equal mass of sodium silicate solution; in Comparative Example 7, the aluminum sulfate solution was replaced with an equal mass of sodium silicate solution, that is, the composition of the inorganic binder was changed, resulting in a decrease in the fire resistance rating, heat insulation property and strength of the obtained alumina ceramic fiber board.

[0130] The above are only specific embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent transformation made using the present invention, directly or indirectly applied in other related technical fields, is similarly included in the patent protection scope of the present invention.

Claims

1. A nano-ceramic coated alumina ceramic fiberboard with fireproof and heat-insulating functions, characterized in that: From top to bottom, it includes a nano ceramic coating and an alumina ceramic fiberboard; the raw materials of the nano ceramic coating include, by weight: 50-70 parts of a binder, 10-20 parts of hydroxylated layered Ti3C2 / silicon oxide hollow spheres / ceramic particles, 0.1-0.5 parts of sodium 2-acrylamide-2-methylpropane sulfonate, 0.01-0.1 parts of an initiator, and 10-20 parts of water; The preparation method of the hydroxylated layered Ti3C2 / silicon oxide hollow sphere / ceramic particle comprises the following steps: ultrasonically dispersing the hydroxylated layered Ti3C2, silicon oxide hollow sphere and ceramic particle in water respectively to obtain a hydroxylated layered Ti3C2 solution, a silicon oxide hollow sphere solution and a ceramic particle solution; mixing the hydroxylated layered Ti3C2 solution and the silicon oxide hollow sphere solution, stirring continuously for 6-10 hours at 40-70°C, adding the ceramic particle solution, stirring continuously for 3-6 hours, cooling, filtering and drying to obtain the hydroxylated layered Ti3C2 / silicon oxide hollow sphere / ceramic particle; The preparation method of the adhesive comprises the following steps: S1. Mix chitosan and water evenly to obtain a chitosan solution; mix the peony bark extract and water evenly to obtain a peony bark extract solution; mix the chitosan solution and the peony bark extract solution in a mass ratio of (2-3):1, and stir at 40-50°C for 30-50 minutes to obtain a chitosan / peony bark extract complex; S2, mixing water, sodium dodecylbenzene sulfonate and monomers, and adding ammonium persulfate to obtain an acrylate emulsion; the monomers include tridecafluorooctyl methacrylate, acrylate monomers and acrylic acid; S3, mixing the chitosan / Paeonia suffruticosa extract complex and the acrylic emulsion evenly to obtain the adhesive; the mass ratio of the chitosan / Paeonia suffruticosa extract complex and the acrylic emulsion is (5-8):1; The method for preparing the alumina ceramic fiberboard comprises the following steps: Step 1, taking water and sodium silicate, mixing them evenly, adding phosphoric acid to adjust the system pH to 3, to obtain a sodium silicate solution; taking water and aluminum sulfate, mixing them evenly, to obtain an aluminum sulfate solution; taking water, ethanol, and zirconium oxychloride, mixing them evenly, adding hydrogen peroxide, and then adding ammonia water to adjust the system pH to 3, to obtain a zirconium oxychloride solution; mixing the sodium silicate solution, the zirconium oxychloride solution, and the aluminum sulfate solution, and stirring them at 60-80° C. for 4-6 hours; to obtain an inorganic binder; Step 2, mixing the alumina fibers and the inorganic binder, flocculating and breaking them up, and then dehydrating and forming to obtain a green body of the alumina ceramic fiberboard; Step 3: Drying and calcining the green body of the alumina ceramic fiber board to obtain the alumina ceramic fiber board.

2. The nano-ceramic coated alumina ceramic fiberboard with fireproof and heat-insulating functions according to claim 1, characterized in that: The raw materials of the hydroxylated layered Ti3C2 / silicon oxide hollow spheres / ceramic particles include hydroxylated layered Ti3C2, silicon oxide hollow spheres and ceramic particles; the mass ratio of the hydroxylated layered Ti3C2, silicon oxide hollow spheres and ceramic particles is (40-60): (2-5): (20-30).

3. The nano-ceramic coated alumina ceramic fiberboard with fireproof and heat-insulating functions according to claim 2, characterized in that: The hollow silicon oxide spheres are hollow silicon oxide spheres without a mesoporous structure.

4. The nano-ceramic coated alumina ceramic fiberboard with fireproof and heat-insulating functions according to claim 3, characterized in that: The ceramic particles include aluminum oxide with a particle size of 100-300 nm, silicon carbide with a particle size of 30-80 nm and zirconium oxide with a particle size of 20-60 nm, and the mass ratio of the three is (10-15): (3-6): (2-4).

5. The nano-ceramic coated alumina ceramic fiberboard with fireproof and heat-insulating functions according to claim 4, characterized in that: The mass ratio of tridecafluorooctyl methacrylate, acrylate monomer and acrylic acid is (1-3): (8-12): (4-6).

6. The alumina ceramic fiberboard with nano-ceramic coating and fireproof and heat-insulating functions according to claim 5, characterized in that: The acrylic acid ester monomer includes methyl acrylate and ethyl acrylate, and the mass ratio of the two is (1-3): (1-3).

7. The alumina ceramic fiberboard with nano-ceramic coating and fireproof and heat-insulating functions according to claim 6, characterized in that: The mass ratio of the sodium silicate solution, the zirconium oxychloride solution and the aluminum sulfate solution is 1:1:(2-4).

8. The nano-ceramic coated alumina ceramic fiberboard with fireproof and heat-insulating functions according to claim 7, characterized in that: The Al2O3 content of the alumina fiber is ≥89%, the diameter of the alumina fiber is 9-12 μm, the bundle strength of the alumina fiber is 1.9-3.0 GPa, and the modulus of the alumina fiber is 300-360 GPa.

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