Preparation method of hot-pressed composite non-combustible insulation board

Abstract

The invention provides a preparation method of a hot-pressed composite non-combustible insulation board, which comprises the following steps: S1, vitreous treatment: uniformly mixing low-temperature glass powder, water glass, sodium fluosilicate and high-temperature-resistant resin, mixing with water and inorganic lightweight aggregate raw materials, fully stirring, and sintering and molding; s2, surface pretreatment: mixing latex powder, cellulose ether and water to prepare a mixed emulsion, coating the surfaces of the vitreous-treated inorganic lightweight aggregate particles obtained in the step S1 with the mixed emulsion, and standing until a semi-dry film is formed on the surfaces of the vitreous-treated inorganic lightweight aggregate particles; s3, mixing: mixing the inorganic lightweight aggregate particles subjected to surface pretreatment in the step S2 with an organic lightweight aggregate raw material, then adding a cementing material, and fully stirring under a heating condition until the materials are uniformly mixed; s4, material distribution; s5, pressurizing and curing; and S6, pressure maintaining and curing. According to the invention, the hot-pressed composite non-combustible insulation board product with low water absorption rate, high strength and low drying shrinkage rate is obtained.

Description

Technical Field

[0001] The invention relates to a method for preparing a thermal insulation board, in particular to a method for preparing a hot-pressed composite non-combustible thermal insulation board, and belongs to the technical field of building fireproof thermal insulation materials. Background Art

[0002] At present, building fireproof and thermal insulation materials are mainly divided into two categories: inorganic insulation boards and organic insulation boards. Traditional inorganic insulation boards are mostly made of inorganic lightweight aggregates such as perlite through a high-temperature sintering process. Although they have good fire resistance and high temperature resistance, the thermal insulation performance and mechanical stability after long-term use are greatly affected due to the high thermal conductivity, high water absorption, high density and obvious brittleness of the material itself. In contrast, a single organic insulation board uses low-density organic lightweight aggregates such as polystyrene and graphite polystyrene particles, which have excellent thermal insulation and lightweight advantages, but its product strength is insufficient and its stability is poor. It is easy to deform under temperature fluctuations or long-term use, and its dimensional stability is poor, which limits its application under harsh working conditions.

[0003] Although the respective material systems in the existing technologies have met the fire prevention and thermal insulation requirements to a certain extent, how to achieve the comprehensive excellent properties of the insulation board such as low thermal conductivity, low water absorption, light weight and high strength, and high dimensional stability while ensuring fire safety and durability is still a technical problem that needs to be overcome urgently. Summary of the invention

[0004] Based on the above background, the purpose of the present invention is to provide a method for preparing a hot-pressed composite non-combustible thermal insulation board to solve the problems described in the background technology.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] A method for preparing a hot-pressed composite non-combustible insulation board, the method comprising the following steps:

[0007] S1. Vitreous treatment: low-temperature glass powder with a softening temperature of 500°C to 650°C, water glass, sodium fluorosilicate and a high-temperature resistant resin are uniformly mixed to obtain a mixed component, wherein the amount of the low-temperature glass powder is 45% to 55%, the total amount of the water glass and the sodium fluorosilicate is 20% to 30%, wherein the amount of sodium fluorosilicate accounts for 10% to 15% of the total amount of water glass and sodium fluorosilicate, and the amount of the high-temperature resistant resin is 20% to 30%, the mixed component is mixed with water and inorganic light aggregate raw materials, and the mixture is fully stirred to obtain a mixture, and the mixture is placed in a high-temperature furnace at a temperature of 650°C to 800°C for sintering to obtain inorganic light aggregate particles with surface vitreous treatment;

[0008] S2, surface pretreatment: mixing latex powder, cellulose ether and water to prepare a mixed emulsion, coating the mixed emulsion on the surface of the vitreous treated inorganic light aggregate particles obtained in step S1, and standing until a semi-dry film is formed on the surface of the vitreous treated inorganic light aggregate particles, thereby obtaining inorganic light aggregate particles after surface pretreatment;

[0009] S3, mixing: mixing the inorganic light aggregate particles after surface pretreatment in step S2 with the organic light aggregate raw material in a volume ratio of 1:2 to 1:3, then adding the cementitious material, and stirring thoroughly under heating until the mixture is uniform;

[0010] S4, fabrication: arranging the mixed material obtained in step S3 in a predetermined mold;

[0011] S5. Pressurized curing: applying pressure to the mixed material after spreading to perform pressurized curing, so that the ratio of the mixed material's spreading thickness to the molding thickness is 2 to 3:1;

[0012] S6. Pressure-maintaining and curing: the pressurized mixed material is continuously pressure-maintained and cured for 8 to 24 hours to obtain the hot-pressed composite non-combustible thermal insulation board.

[0013] Preferably, in step S1, the inorganic lightweight aggregate raw material is one of perlite and expanded vermiculite.

[0014] Preferably, in step S1, the inorganic lightweight aggregate raw material is perlite with a particle size of 2 to 8 mm.

[0015] Preferably, in the step S1, the mixed components are mixed with water and inorganic light aggregate raw materials in a ratio of 1 kg: 2-4 kg: 15-25 L.

[0016] Preferably, in step S1, the high temperature resistant resin is obtained by mixing a phenolic resin having a solid content of 30-35% and a melamine resin in a weight ratio of 1:1 to 3:7.

[0017] Preferably, in step S2, the amounts of latex powder, cellulose ether and water used to prepare the mixed emulsion are 80-120 g, 4-8 g and 480-520 g respectively.

[0018] Preferably, in step S2, the ratio of the mixed emulsion to the inorganic lightweight aggregate particles after vitreous treatment is 70-90 g: 4-7 L.

[0019] Preferably, in step S3, the organic light aggregate raw material is one of polystyrene particles and graphite polystyrene particles.

[0020] Preferably, in step S3, the cementitious material is one or more of cement, microsilica powder, latex powder, cellulose ether, polypropylene fiber and water reducing agent.

[0021] Preferably, in step S3, the temperature range of the heating condition is 60-90°C.

[0022] Preferably, in step S4, arranging the mixed material obtained in step S3 in a predetermined mold specifically comprises the following steps:

[0023] Arrange the bottom layer material in a predetermined mold, and then place the lower layer reinforcement mesh;

[0024] Arrange the middle layer material on the surface of the lower reinforcement mesh, and then place the upper reinforcement mesh;

[0025] Place a number of parallel keels on the surface of the upper reinforcement mesh, and then arrange the surface material;

[0026] Wherein, the bottom layer material, the middle layer material and the surface layer material are all mixed materials obtained in step S3.

[0027] Preferably, the distance from the keel to the top surface of the surface material is not more than 1 cm, the spacing between adjacent keels is 30-40 cm, and the distance from the lower reinforcing mesh to the bottom surface of the bottom material is not more than 1 cm.

[0028] Preferably, in step S5, pressurized curing is performed at a temperature of 60°C to 90°C.

[0029] Preferably, in step S6, pressure-maintaining curing is performed at a temperature of 60° C. to 100° C.

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] The present invention provides a method for preparing a hot-pressed composite non-combustible insulation board, which improves the surface properties, reduces brittleness and water absorption, and improves adhesion by performing vitrification treatment and surface pretreatment on inorganic light aggregates. The inorganic light aggregates after surface pretreatment are mixed with organic light aggregates to reduce thermal conductivity and weight while improving mechanical strength and dimensional stability. Finally, a hot-pressed composite non-combustible insulation board product with low water absorption, high strength and low drying shrinkage is obtained through laying and hot pressing curing. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0033] Figure 1 The invention discloses a process diagram of a method for preparing a hot-pressed composite non-combustible thermal insulation board. DETAILED DESCRIPTION

[0034] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings. It should be understood that the implementation of the present invention is not limited to the following embodiments, and any form of modification and / or change made to the present invention will fall within the protection scope of the present invention.

[0035] In the present invention, unless otherwise specified, all parts and percentages are weight units, and the equipment and raw materials used can be purchased from the market or are commonly used in the art. The methods in the following embodiments, unless otherwise specified, are conventional methods in the art. The components or equipment in the following embodiments, unless otherwise specified, are universal standard parts or components known to those skilled in the art, and their structures and principles are known to those skilled in the art through technical manuals or conventional experimental methods.

[0036] The present invention discloses a method for preparing a hot-pressed composite non-combustible thermal insulation board. Figure 1 As shown, the method comprises the following steps:

[0037] S1, glass treatment: low-temperature glass powder with a softening temperature of 500°C to 650°C, water glass, sodium fluorosilicate and a high-temperature resistant resin are uniformly mixed to obtain a mixed component, according to the weight percentage of the mixed component, the amount of low-temperature glass powder is 45% to 55%, the total amount of water glass and the sodium fluorosilicate is 20% to 30%, wherein the amount of sodium fluorosilicate accounts for 10% to 15% of the total amount of water glass and sodium fluorosilicate, and the amount of high-temperature resistant resin is 20% to 30%, the mixed component is mixed with water and inorganic light aggregate raw materials, and fully stirred to obtain a mixture, and the mixture is placed in a high-temperature furnace at a temperature of 650°C to 800°C for sintering to obtain inorganic light aggregate particles with surface glass treatment;

[0038] S2, surface pretreatment: mixing latex powder, cellulose ether and water to prepare a mixed emulsion, coating the mixed emulsion on the surface of the inorganic light aggregate particles after the glass treatment obtained in step S1, and standing until a semi-dry film is formed on the surface of the inorganic light aggregate particles after the glass treatment, thereby obtaining inorganic light aggregate particles after surface pretreatment;

[0039] S3, mixing: mixing the inorganic light aggregate particles after surface pretreatment in step S2 with the organic light aggregate raw material in a volume ratio of 1:2 to 1:3, then adding the cementitious material, and stirring thoroughly under heating until the mixture is uniform;

[0040] S4, fabrication: arranging the mixed material obtained in step S3 in a predetermined mold;

[0041] S5. Pressurized curing: applying pressure to the mixed material after spreading to perform pressurized curing, so that the ratio of the mixed material's spreading thickness to the molding thickness is 2 to 3:1;

[0042] S6. Pressure-maintaining and curing: the pressurized mixed material is continuously pressure-maintained and cured for 8 to 24 hours to obtain a hot-pressed composite non-combustible thermal insulation board.

[0043] In step S1, the inorganic light aggregate raw material is one of perlite and expanded vermiculite. Preferably, the inorganic light aggregate raw material is perlite with a particle size of 2 to 8 mm. The mixed components are mixed with water and the inorganic light aggregate raw material in a ratio of 1 kg: 2 to 4 kg: 15 to 25 L. The high temperature resistant resin is obtained by mixing a phenolic resin with a solid content of 30-35% and a melamine resin in a weight ratio of 1: 1 to 3: 7.

[0044] In step S2, the amount of latex powder, cellulose ether and water used to prepare the mixed emulsion is 80-120g, 4-8g and 480-520g respectively. The amount ratio of the mixed emulsion to the inorganic lightweight aggregate after vitreous treatment is 70-90g:4-7L.

[0045] In step S3, the organic light aggregate raw material is one of polystyrene particles and graphite polystyrene particles. The cementitious material is one or more of cement, microsilica powder, latex powder, cellulose ether, polypropylene fiber and water reducing agent. The temperature range of the heating condition is 60-90°C.

[0046] In step S4, placing the mixed material obtained in step S3 in a predetermined mold specifically includes the following steps:

[0047] Arrange the bottom layer material in a predetermined mold, and then place the lower layer reinforcement mesh;

[0048] Arrange the middle layer material on the surface of the lower reinforcement mesh, and then place the upper reinforcement mesh;

[0049] Place a number of parallel keels on the surface of the upper reinforcement mesh, and then arrange the surface material;

[0050] Among them, the bottom layer material, the middle layer material and the surface layer material are all mixed materials obtained in step S3.

[0051] The distance from the keel to the top surface of the surface material is not more than 1 cm, the spacing between adjacent keels is 30 to 40 cm, and the distance from the lower layer of reinforcement mesh to the bottom surface of the bottom layer of the bottom material is not more than 1 cm.

[0052] In step S5, pressurized curing is performed at a temperature of 60°C to 90°C.

[0053] In step S6, pressure maintenance is performed at a temperature of 60°C to 100°C.

[0054] Example 1

[0055] A method for preparing a hot-pressed composite non-combustible insulation board, the method comprising the following steps:

[0056] S1. Glass treatment:

[0057] 45% of low-temperature glass powder with a softening temperature of 500°C, 20% of the total amount of water glass and sodium fluorosilicate (of which sodium fluorosilicate accounts for 10% of the total amount), and 35% of high-temperature resistant resin are mixed evenly to obtain a mixed component. The mixed component is mixed with water and inorganic light aggregate raw materials in a ratio of 1kg:2kg:15L, and stirred thoroughly to obtain a mixture. The inorganic light aggregate raw material is perlite with a particle size of 2mm. The mixture is placed in a high-temperature furnace at a temperature of 650-800°C for sintering and molding to obtain a glassy treated inorganic light aggregate. Among them, the high-temperature resistant resin is obtained by mixing a phenolic resin with a solid content of 30% and a melamine resin in a weight ratio of 1:1.

[0058] S2. Surface pretreatment:

[0059] 80g of latex powder, 4g of cellulose ether and 480g of water are mixed to prepare a mixed emulsion. According to the ratio of 70g of mixed emulsion: 4L of inorganic light aggregate after vitrification treatment, the mixed emulsion is coated on the surface of the inorganic light aggregate after vitrification treatment obtained in step S1, and allowed to stand until a semi-dry film is formed on the surface of the inorganic light aggregate after vitrification treatment, thereby obtaining inorganic light aggregate after surface pretreatment.

[0060] S3, Mixed:

[0061] The inorganic lightweight aggregate after surface pretreatment in step S2 was mixed with polystyrene particles in a volume ratio of 1:2, and then cement was added as a cementitious material, and the mixture was fully stirred at 60±2°C until the mixture was uniformly mixed.

[0062] S4. Fabric:

[0063] The mixed material obtained in step S3 is arranged in a predetermined mold, and the specific steps are as follows:

[0064] Arrange the bottom layer material in a predetermined mold, and then place the lower layer reinforcement mesh;

[0065] Arrange the middle layer material on the surface of the lower reinforcement mesh, and then place the upper reinforcement mesh;

[0066] Place a number of parallel keels on the surface of the upper reinforcement mesh, and then arrange the surface material;

[0067] The bottom layer material and the surface layer material are both mixed materials obtained in step S3. The distance from the keel to the top surface of the surface layer material is 1 cm, the spacing between adjacent keels is 30 cm, and the distance from the lower layer reinforcement mesh to the bottom surface of the bottom layer material is 1 cm.

[0068] S5. Pressurized curing:

[0069] Apply pressure to the mixed material after spreading at a temperature of 60±2°C for pressurized curing, so that the ratio of the mixed material's spreading thickness to the molding thickness is 2:1.

[0070] S6. Pressure maintenance:

[0071] The pressurized mixed material is maintained under pressure for 8 hours at a temperature of 60±2°C to obtain a hot-pressed composite non-combustible insulation board.

[0072] Example 2

[0073] A method for preparing a hot-pressed composite non-combustible insulation board, the method comprising the following steps:

[0074] S1. Glass treatment:

[0075] 50% of low-temperature glass powder with a softening temperature of 575°C, 25% of the total amount of water glass and sodium fluorosilicate (sodium fluorosilicate accounts for 12.5% ​​of the total amount), and 25% of high-temperature resistant resin are mixed evenly to obtain a mixed component. The mixed component is mixed with water and inorganic light aggregate raw materials in a ratio of 1kg:3kg:20L, and stirred thoroughly to obtain a mixture. The inorganic light aggregate raw material is perlite with a particle size of 5mm. The mixture is sintered in a high-temperature furnace at a temperature of 650-800°C to obtain a glassy treated inorganic light aggregate. Among them, the high-temperature resistant resin is obtained by mixing phenolic resin with a solid content of 32.5% and melamine resin in a weight ratio of 1:2.

[0076] S2. Surface pretreatment:

[0077] 100g of latex powder, 6g of cellulose ether and 500g of water are mixed to prepare a mixed emulsion. According to the ratio of 80g of mixed emulsion: 6L of inorganic light aggregate after vitrification treatment, the mixed emulsion is coated on the surface of the inorganic light aggregate after vitrification treatment obtained in step S1, and allowed to stand until a semi-dry film is formed on the surface of the inorganic light aggregate after vitrification treatment, thereby obtaining inorganic light aggregate after surface pretreatment.

[0078] S3, Mixed:

[0079] The inorganic lightweight aggregate after surface pretreatment in step S2 was mixed with graphite polystyrene particles in a volume ratio of 1:2.5, and then cement, microsilica powder and water reducing agent were added as cementitious materials, and the mixture was fully stirred at 75±2°C until the mixture was uniformly mixed.

[0080] S4. Fabric:

[0081] The mixed material obtained in step S3 is arranged in a predetermined mold, and the specific steps are as follows:

[0082] Arrange the bottom layer material in a predetermined mold, and then place the lower layer reinforcement mesh;

[0083] Arrange the middle layer material on the surface of the lower reinforcement mesh, and then place the upper reinforcement mesh;

[0084] Place a number of parallel keels on the surface of the upper reinforcement mesh, and then arrange the surface material;

[0085] The bottom layer material and the surface layer material are both mixed materials obtained in step S3. The distance from the keel to the top surface of the surface layer material is 0.5 cm, the spacing between adjacent keels is 35 cm, and the distance from the lower layer reinforcement mesh to the bottom surface of the bottom layer material is 0.5 cm.

[0086] S5. Pressurized curing:

[0087] Under the temperature condition of 75±2°C, pressure is applied to the mixed material after spreading for pressurized curing, so that the ratio of the mixed material's spreading thickness to the molding thickness is 2.5:1.

[0088] S6. Pressure maintenance:

[0089] The pressurized mixed material is maintained under pressure for 16 hours at a temperature of 80±2° C. to obtain a hot-pressed composite non-combustible insulation board.

[0090] Example 3

[0091] A method for preparing a hot-pressed composite non-combustible insulation board, the method comprising the following steps:

[0092] S1. Glass treatment:

[0093] 55% of low-temperature glass powder with a softening temperature of 650°C, 30% of the total amount of water glass and sodium fluorosilicate (sodium fluorosilicate accounts for 15% of the total amount), and 15% of high-temperature resistant resin are mixed evenly to obtain a mixed component. The mixed component is mixed with water and inorganic light aggregate raw materials in a ratio of 1kg:4kg:25L, and stirred thoroughly to obtain a mixture. The inorganic light aggregate raw material is calcined pumice with a particle size of 8mm. The mixture is placed in a high-temperature furnace at a temperature of 650-800°C for sintering and molding to obtain a glassy treated inorganic light aggregate. Among them, the high-temperature resistant resin is obtained by mixing a phenolic resin with a solid content of 35% and a melamine resin in a weight ratio of 3:7.

[0094] S2. Surface pretreatment:

[0095] 120g of latex powder, 8g of cellulose ether and 520g of water are mixed to prepare a mixed emulsion. According to the ratio of 90g of mixed emulsion: 7L of inorganic light aggregate after vitrification treatment, the mixed emulsion is coated on the surface of the inorganic light aggregate after vitrification treatment obtained in step S1, and allowed to stand until a semi-dry film is formed on the surface of the inorganic light aggregate after vitrification treatment, thereby obtaining inorganic light aggregate after surface pretreatment.

[0096] S3, Mixed:

[0097] The inorganic lightweight aggregate after surface pretreatment in step S2 is mixed with polystyrene particles in a volume ratio of 1:3, and then cement, microsilica powder, latex powder, cellulose ether, polypropylene fiber and water reducing agent are added as cementitious materials, and stirred at 90±2°C until the mixture is uniformly mixed.

[0098] S4. Fabric:

[0099] The mixed material obtained in step S3 is arranged in a predetermined mold, and the specific steps are as follows:

[0100] Arrange the bottom layer material in a predetermined mold, and then place the lower layer reinforcement mesh;

[0101] Arrange the middle layer material on the surface of the lower reinforcement mesh, and then place the upper reinforcement mesh;

[0102] Place a number of parallel keels on the surface of the upper reinforcement mesh, and then arrange the surface material;

[0103] The bottom layer material and the surface layer material are both mixed materials obtained in step S3. The distance from the keel to the top surface of the surface layer material is 0.8 cm, the spacing between adjacent keels is 40 cm, and the distance from the lower layer reinforcement mesh to the bottom surface of the bottom layer material is 0.8 cm.

[0104] S5. Pressurized curing:

[0105] Under the temperature condition of 90±2°C, pressure is applied to the mixed material after spreading for pressurized curing, so that the ratio of the mixed material's spreading thickness to the molding thickness is 3:1.

[0106] S6. Pressure maintenance:

[0107] The pressurized mixed material is maintained under pressure for 24 hours at a temperature of 100±2°C to obtain a hot-pressed composite non-combustible insulation board.

[0108] Comparative Example 1

[0109] A method for preparing a hot-pressed composite non-combustible insulation board, the technical scheme is the same as that of Example 2, except that:

[0110] In step S1, perlite with a particle size of 5 mm without glass treatment is directly used as inorganic lightweight aggregate, and then it is subjected to surface pretreatment in step S2.

[0111] Steps S2-S6 are exactly the same as those in the second embodiment.

[0112] Comparative Example 2

[0113] A method for preparing a hot-pressed composite non-combustible insulation board, the technical scheme is the same as that of Example 2, except that:

[0114] The surface pretreatment of step S2 is not performed, that is, after step S1 is completed, steps S3 to S6 are directly performed.

[0115] Steps S3-S6 are exactly the same as those in the second embodiment.

[0116] Comparative Example 3

[0117] The performance indicators of the commercially available inorganic lightweight aggregate fireproof insulation board prepared by conventional methods meet the product standard of the construction industry numbered JG / T 435-2014.

[0118] Comparative Example 4

[0119] The performance indicators of the commercially available thermosetting composite polystyrene foam insulation board prepared by conventional methods meet the product standard of the construction industry numbered JG / T536-2017.

[0120] The non-combustible thermal insulation boards prepared according to the methods of Examples 1-3 and Comparative Examples 1-4 were subjected to performance tests, and the results are shown in Table 1.

[0121] Table 1 Performance test results of various embodiments and comparative examples

[0122] Test items Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 <![CDATA[Density (kg / m 3 )]]> 178 175 180 208 174 275 190 Thermal conductivity (W / m·K) 0.052 0.051 0.054 0.069 0.056 0.068 0.060 Volume water absorption (%) 2 1.8 1.9 5.0 1.9 8 8.5 Tensile strength perpendicular to the board surface (MPa) 0.21 0.21 0.22 0.12 0.11 0.15 0.12 Compressive strength(MPa) 0.70 0.70 0.71 0.41 0.69 0.7 0.2 Softening coefficient 0.79 0.80 0.79 0.65 0.79 0.85 0.80 Drying shrinkage (%) 0.08 0.08 0.08 0.16 0.08 0.5 0.60 Combustion performance grade A2 A2 A2 A2 A2 A1 A2

[0123] It can be seen from Table 1 that the non-combustible insulation boards prepared by the methods of Examples 1-3 have significantly improved performance indicators in terms of volume water absorption, tensile strength perpendicular to the board surface, and drying shrinkage compared with products prepared by other methods, showing lower water absorption, high strength, and lower drying shrinkage.

[0124] Comparative Example 1 has not been treated with glass, and compared with Example 2, it has poor thermal conductivity, significantly increased water absorption, low strength and brittleness, more prone to shrinkage, and similar combustion performance. This may be because the glass treatment of high-temperature sintering in step S1, on the one hand, makes the surface of the inorganic light aggregate obtain glass coating, and at the same time changes the surface structure of the raw materials, thereby reducing its water absorption and thermal conductivity; on the other hand, it can reduce the impact of the breakage and pulverization of the inorganic light aggregate particles during stirring and molding on the bonding performance of the inorganic cementitious material, improve the interface bonding performance of the inorganic light aggregate, and help to form a stronger bond with the organic light aggregate and cementitious material.

[0125] Comparative Example 2 has no surface pretreatment, and has lower strength, poorer bonding performance, and similar combustion performance compared to Example 2. This may be because the surface pretreatment in step S2 provides an interface film for the inorganic light aggregate, which improves the bonding performance with the organic light aggregate and the cementitious material.

[0126] It can be seen that the glass treatment of high temperature sintering in step S1 combined with the surface pretreatment in step S2 has a significant synergistic effect on improving the density, thermal conductivity, strength, water absorption and softening resistance of the inorganic lightweight aggregate.

[0127] Comparative Example 3 is a conventional inorganic lightweight aggregate fireproof insulation board. The volume water absorption rate is significantly increased compared with Examples 1-3 and Comparative Examples 1-3, and the drying shrinkage rate is increased by multiples. It is loose and brittle, not suitable for large-size products, and its application range is obviously limited.

[0128] Comparative Example 4 is a conventional thermosetting composite polystyrene foam insulation board, and its volume water absorption is similar to that of Comparative Example 3, while its compressive strength is significantly reduced, and its drying shrinkage is still increased by a multiple order relative to Examples 1-3 and Comparative Examples 1-3, and its flexural resistance is also poor.

[0129] In summary, the method for preparing a hot-pressed composite non-combustible thermal insulation board disclosed in the present invention improves the surface properties and reduces brittleness and water absorption by vitrifying and pre-treating the inorganic light aggregate. The inorganic light aggregate after surface pre-treatment is mixed with the organic light aggregate to reduce thermal conductivity and weight while improving mechanical strength and dimensional stability. Finally, a hot-pressed composite non-combustible thermal insulation board product with low water absorption, high strength and low drying shrinkage is obtained through laying and hot pressing curing. In addition, during the laying process, the anti-deformation ability and overall bonding of the hot-pressed composite non-combustible thermal insulation board are further enhanced by setting the keel and reinforcing mesh.

[0130] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A method for preparing a hot-pressed composite non-combustible insulation board, characterized in that: The method comprises the following steps: S1. Vitreous treatment: low-temperature glass powder with a softening temperature of 500°C to 650°C, water glass, sodium fluorosilicate and a high-temperature resistant resin are uniformly mixed to obtain a mixed component, wherein the amount of the low-temperature glass powder is 45% to 55%, the total amount of the water glass and the sodium fluorosilicate is 20% to 30%, wherein the amount of sodium fluorosilicate accounts for 10% to 15% of the total amount of water glass and sodium fluorosilicate, and the amount of the high-temperature resistant resin is 20% to 30%, the mixed component is mixed with water and inorganic light aggregate raw materials, and the mixture is fully stirred to obtain a mixture, and the mixture is placed in a high-temperature furnace at a temperature of 650°C to 800°C for sintering to obtain inorganic light aggregate particles with surface vitreous treatment; S2, surface pretreatment: mixing latex powder, cellulose ether and water to prepare a mixed emulsion, coating the mixed emulsion on the surface of the vitreous treated inorganic light aggregate particles obtained in step S1, and standing until a semi-dry film is formed on the surface of the vitreous treated inorganic light aggregate particles, thereby obtaining inorganic light aggregate particles after surface pretreatment; S3, mixing: mixing the inorganic light aggregate particles after surface pretreatment in step S2 with the organic light aggregate raw material in a volume ratio of 1:2 to 1:3, then adding the cementitious material, and stirring thoroughly under heating until the mixture is uniform; S4, fabrication: arranging the mixed material obtained in step S3 in a predetermined mold; S5. Pressurized curing: applying pressure to the mixed material after spreading to perform pressurized curing, so that the ratio of the mixed material's spreading thickness to the molding thickness is 2 to 3:1; S6. Pressure-maintaining and curing: the pressurized mixed material is continuously pressure-maintained and cured for 8 to 24 hours to obtain the hot-pressed composite non-combustible thermal insulation board.

2. The method for preparing a hot-pressed composite non-combustible insulation board according to claim 1, characterized in that: In the step S1, the inorganic lightweight aggregate raw material is one of perlite and expanded vermiculite.

3. The method for preparing a hot-pressed composite non-combustible insulation board according to claim 2, characterized in that: In the step S1, the inorganic lightweight aggregate raw material is perlite with a particle size of 2 to 8 mm.

4. The method for preparing a hot-pressed composite non-combustible insulation board according to claim 1, characterized in that: In the step S1, the mixed components are mixed with water and inorganic light aggregate raw materials in a ratio of 1 kg: 2-4 kg: 15-25 L.

5. The method for preparing a hot-pressed composite non-combustible insulation board according to claim 1, characterized in that: In the step S1, the high temperature resistant resin is obtained by mixing a phenolic resin having a solid content of 30-35% and a melamine resin in a weight ratio of 1:1 to 3:

7.

6. The method for preparing a hot-pressed composite non-combustible insulation board according to claim 1, characterized in that: In the step S2, the amounts of latex powder, cellulose ether and water used to prepare the mixed emulsion are 80-120 g, 4-8 g and 480-520 g respectively.

7. The method for preparing a hot-pressed composite non-combustible insulation board according to claim 1, characterized in that: In the step S2, the ratio of the mixed emulsion to the inorganic lightweight aggregate particles after vitreous treatment is 70-90 g: 4-7 L.

8. The method for preparing a hot-pressed composite non-combustible insulation board according to claim 1, characterized in that: In step S3, the temperature range of the heating condition is 60-90°C.

9. The method for preparing a hot-pressed composite non-combustible insulation board according to claim 1, characterized in that: In step S4, placing the mixed material obtained in step S3 in a predetermined mold specifically includes the following steps: Arrange the bottom layer material in a predetermined mold, and then place the lower layer reinforcement mesh; Arrange the middle layer material on the surface of the lower reinforcement mesh, and then place the upper reinforcement mesh; Place a number of parallel keels on the surface of the upper reinforcement mesh, and then arrange the surface material; Wherein, the bottom layer material, the middle layer material and the surface layer material are all mixed materials obtained in step S3.

10. The method for preparing a hot-pressed composite non-combustible thermal insulation board according to claim 9, characterized in that: The distance from the keel to the top surface of the surface material is not greater than 1 cm, the spacing between adjacent keels is 30-40 cm, and the distance from the lower layer reinforcement mesh to the bottom surface of the bottom layer material is not greater than 1 cm.

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