Preparation process of color stone metal heat preservation and decoration integrated plate

Abstract

The invention relates to the technical field of building materials, and particularly discloses a preparation process of a color stone metal heat preservation and decoration integrated plate, which comprises the following steps: step 1, pretreating a metal facing raw material, cleaning a metal facing, removing oil stains, dust and impurities on the surface of the metal facing, and after cleaning, removing the metal facing from the surface of the metal facing; the metal facing raw material is subjected to micro-etching treatment through etching liquid; according to the method, atomized gas containing nano silicon dioxide particles is intermittently sprayed into the oven under the action of the hot air curing process, the nano silicon dioxide particles have extremely small particle sizes and large specific surface areas and can be filled in tiny gaps between the colored stone raw materials and the metal facing raw materials, the roughness of a bonding interface is increased, and the bonding strength of the colored stone raw materials and the metal facing raw materials is improved. And the coating also interacts with molecules on the surfaces of the colored stone and the metal facing to form chemical bonds or physical adsorption, so that the bonding strength is remarkably enhanced, the problems of cracking, bulging and the like after the colored stone and the metal facing are bonded are effectively prevented, and the overall quality of a product is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and particularly relates to a preparation process of a colored stone metal thermal insulation decorative integrated board. Background Art

[0002] In the field of construction, as people's requirements for building quality, energy conservation and environmental protection, and decorative effects continue to increase, building exterior wall decoration materials are facing higher challenges. Traditional building exterior wall decoration materials, such as tiles, paints, etc., are gradually unable to meet the needs of modern buildings in terms of performance and decorative effects. Tiles have safety hazards such as easy falling off, and the construction period is long; although paints are relatively easy to apply, they have poor durability and are prone to fading, cracking and other problems. Therefore, the development of a new type of exterior wall decoration material that has both decorative and thermal insulation properties and good durability has become an urgent need for the development of the industry.

[0003] As a new type of building exterior wall decoration material, colored stone metal insulation decorative integrated board has emerged and received widespread attention. It integrates decoration and insulation functions, which can not only effectively improve the aesthetics of the building, but also significantly improve the building's insulation performance and reduce energy consumption, which is in line with the current development trend of energy conservation and emission reduction. However, the existing colored stone metal insulation decorative integrated board preparation process still has some problems that need to be solved in practical application.

[0004] In terms of the combination of metal finishes and colored stones, since the surface of the metal finishes is relatively smooth, the bonding force between the colored stones and the metal finishes is insufficient, which can easily lead to the colored stones falling off, cracking, bulging, etc. during use, seriously affecting the service life and decorative effect of the product. Traditional treatment methods are often difficult to effectively increase the roughness and specific surface area of ​​the metal finish surface, and cannot provide sufficient bonding force between the colored stones and the metal finishes. Therefore, a preparation process of a colored stone metal thermal insulation decorative integrated board is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a preparation process of a colored stone metal thermal insulation decorative integrated board to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A preparation process of a colored stone metal thermal insulation decorative integrated board, comprising:

[0008] Step 1: Pre-treat the metal finishing materials and clean the metal finishing to remove oil, dust and impurities on the metal finishing surface to ensure that the metal finishing surface is clean and smooth; and after cleaning, micro-etch the metal finishing materials with etching liquid to increase the roughness and specific surface area of ​​the metal finishing surface, thereby improving the bonding strength between the subsequent colored stone and the metal finishing;

[0009] Step 2: Spray the colored stone raw materials evenly on the pretreated metal finishing raw materials. Before spraying, pretreat the colored stone by soaking it in a solution containing a surfactant for 10 to 30 minutes to improve the wettability of the colored stone surface and enhance the adhesion between the colored stone and the subsequent bonding material.

[0010] Step 3: Hot air curing is performed on the metal finishing material sprayed with the colored stone raw material, and the metal finishing material sprayed with the colored stone raw material is placed in an oven, and the colored stone raw material and the metal finishing material are combined by hot air; and during the hot air curing process, atomized gas containing nano-silicon dioxide particles is intermittently sprayed into the oven, and each spraying time is 1 to 3 minutes. The nano-silicon dioxide particles are filled in the tiny gaps between the colored stone raw material and the metal finishing raw material, thereby enhancing the bonding strength and ensuring that the colored stone and the metal finishing will not fall off, crack, or bulge after being combined;

[0011] Step 4: Compound the thermal insulation substrate. Cut the thermal insulation material into predetermined sizes to serve as the thermal insulation substrate for the integrated board. Set a microporous structure on the surface of the thermal insulation substrate by laser drilling or chemical foaming to increase the contact area between the thermal insulation substrate and the subsequent bonding material, thereby improving the bonding effect. Compound the thermal insulation substrate with the metal finish combined with the colored stone to form an integrated board structure.

[0012] Step 5: The composite colored stone metal thermal insulation decorative integrated board is cured and shaped as a whole, and the composite colored stone metal thermal insulation decorative integrated board is placed in a constant temperature and humidity environment for curing and shaping; at the same time, during the curing process, a periodically changing low-frequency electromagnetic field is applied around the colored stone metal thermal insulation decorative integrated board. The low-frequency electromagnetic field promotes the movement and cross-linking reaction between the molecules of the bonding material, accelerates the curing process, and improves the curing quality.

[0013] Preferably, in step 1, the etching solution is acidic, the concentration of hydrogen ions in the etching solution is 0.5 to 2 mol / L, the etching time is 30 to 90 seconds, and the etching depth is 1 to 3 μm.

[0014] Preferably, in step 2, the spraying equipment uses a spray gun, the spraying pressure of the spray gun is 0.3-0.5 MPa, and the spraying distance of the spray gun is 20-30 cm, so as to ensure that the colored stone is evenly sprayed on the metal finish; the surfactant is a non-ionic surfactant, the material of the colored stone raw material is basalt, the particle size range of the colored stone raw material is 1-5 mm, and the mass fraction of the surfactant in the solution is 0.1%-0.5%.

[0015] Preferably, in step three, a temperature sensor and a wind speed sensor are provided in the oven, and the temperature sensor and wind speed sensor are used to monitor and adjust the hot air temperature and wind speed in real time, and the hot air wind speed is 2 to 5 m / s; the atomizing gas containing nano-silica particles is formed by atomizing a solution containing nano-silica particles through an ultrasonic atomizer, and the mass fraction of the nano-silica particles in the solution is 0.05% to 0.2%, the hot air temperature is 120-180°C, the hot air action time is 30 to 60 minutes, the particle size of the nano-silica particles is 10-50 nm, and the injection interval time is 5 to 10 minutes.

[0016] Preferably, in step four, the insulation material cutting machine adopts a CNC cutting machine, the insulation material includes polystyrene foam board, rock wool board and polyurethane foam board, the micropore diameter is 50-200μm, the porosity of the micropore is 30% to 60%, and precise cutting is performed according to preset size parameters. The size error of the insulation substrate after cutting is controlled within ±1mm; the composite method adopts adhesive composite, and the adhesive is evenly coated on the contact surface of the insulation substrate or the metal finish combined with colored stone, and the adhesive is an epoxy resin adhesive or a polymer cement-based adhesive; nanofibers are added to the adhesive, the length of the nanofibers is 10-50μm, the diameter of the nanofibers is 50-200nm, and the mass fraction of the nanofibers is 0.1% to 0.3%. The nanofibers enhance the toughness and crack resistance of the adhesive.

[0017] Preferably, the thermal insulation substrate and the metal finish combined with colored stone are bonded and compounded by an adhesive, and the adhesive is applied by scraping and spraying, and the coating thickness of the adhesive is 0.5 to 1.5 mm, ensuring that the thermal insulation substrate and the metal finish combined with colored stone are firmly bonded; the nanofiber is carbon nanofiber or polyacrylonitrile nanofiber.

[0018] Preferably, in step five, the curing temperature of the colored stone metal thermal insulation decorative integrated board is 20-40°C, the curing humidity of the colored stone metal thermal insulation decorative integrated board is 50% to 70%, and the curing time of the colored stone metal thermal insulation decorative integrated board is 24 to 72 hours.

[0019] Preferably, the frequency of the low-frequency electromagnetic field is 10-100 Hz, and the intensity of the low-frequency electromagnetic field is 0.1-0.5T.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] During the pretreatment stage of the metal finish, an acidic etching solution is used for micro-etching. By precisely controlling the concentration of hydrogen ions in the etching solution, etching time, and etching depth, a microscopic rough structure is formed on the surface of the metal finish, significantly increasing the roughness and specific surface area of ​​the metal finish. This microstructure provides more mechanical engagement points for the combination of the colored stone and the metal finish, greatly improving the subsequent bonding strength between the colored stone and the metal finish, effectively preventing the colored stone from falling off during use, and ensuring the long-term stability and aesthetics of the product.

[0022] The colored stone raw materials are pretreated and immersed in a solution containing a non-ionic surfactant to improve the wettability of the colored stone surface. By controlling the mass fraction of the surfactant and the immersion time, the colored stone surface can be better infiltrated by the subsequent bonding material, thereby enhancing the adhesion between the colored stone and the bonding material and further improving the bonding stability of the colored stone on the metal finish.

[0023] During the hot air curing process, atomized gas containing nano-silica particles is intermittently sprayed into the oven. Nano-silica particles have extremely small particle size and large specific surface area, and can fill the tiny gaps between the colored stone raw materials and the metal finishing raw materials. By precisely controlling the mass fraction, particle size, spraying time, interval time, hot air temperature, wind speed and action time of the nano-silica particles, the nano-silica particles not only increase the roughness of the bonding interface, but also interact with the molecules on the surface of the colored stone and the metal finishing to form chemical bonds or physical adsorption, significantly enhancing the bonding strength, effectively preventing problems such as cracking and bulging after the colored stone and the metal finishing are combined, and improving the overall quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a flow chart of the steps of the present invention. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] like Figure 1 As shown, a preparation process of a colored stone metal thermal insulation decorative integrated board includes:

[0027] Step 1: Pre-treat the metal finishing materials and clean the metal finishing to remove oil, dust and impurities on the metal finishing surface to ensure that the metal finishing surface is clean and smooth; and after cleaning, micro-etch the metal finishing materials with etching liquid to increase the roughness and specific surface area of ​​the metal finishing surface, thereby improving the bonding strength between the subsequent colored stone and the metal finishing;

[0028] The present invention further specifically details that in step 1, the etching solution is acidic, the concentration of hydrogen ions in the etching solution is 0.5 to 2 mol / L, the etching time is 30 to 90 seconds, and the etching depth is 1 to 3 μm;

[0029] Step 2: Spray the colored stone raw materials evenly on the pretreated metal finishing raw materials. Before spraying, pretreat the colored stone by soaking it in a solution containing a surfactant for 10 to 30 minutes to improve the wettability of the colored stone surface and enhance the adhesion between the colored stone and the subsequent bonding material.

[0030] The present invention is further specifically described in detail. In step 2, the spraying equipment uses a spray gun, the spraying pressure of the spray gun is 0.3-0.5 MPa, and the spraying distance of the spray gun is 20-30 cm to ensure that the colored stone is evenly sprayed on the metal surface; the surfactant is a non-ionic surfactant, the material of the colored stone raw material is basalt, the particle size range of the colored stone raw material is 1-5 mm, and the mass fraction of the surfactant in the solution is 0.1%-0.5%;

[0031] Step 3: Hot air curing is performed on the metal finishing material sprayed with the colored stone raw material. The metal finishing material sprayed with the colored stone raw material is placed in an oven, and the colored stone raw material and the metal finishing material are combined by hot air; and during the hot air curing process, atomized gas containing nano-silicon dioxide particles is intermittently sprayed into the oven. Each spraying time is 1 to 3 minutes. The nano-silicon dioxide particles fill the tiny gaps between the colored stone raw material and the metal finishing material to enhance the bonding strength and ensure that the colored stone and the metal finishing will not fall off, crack, or bulge after being combined;

[0032] The present invention further specifically details that in step three, a temperature sensor and a wind speed sensor are provided in the oven, and the temperature sensor and the wind speed sensor are used to monitor and adjust the hot air temperature and wind speed in real time, and the hot air wind speed is 2 to 5 m / s; an atomizing gas containing nano-silica particles is atomized by an ultrasonic atomizer to form a solution containing nano-silica particles, wherein the mass fraction of the nano-silica particles in the solution is 0.05% to 0.2%, the hot air temperature is 120-180°C, the hot air action time is 30 to 60 minutes, the nano-silica particles have a particle size of 10 to 50 nm, and the spraying interval is 5 to 10 minutes;

[0033] Step 4: Compound the thermal insulation substrate. Cut the thermal insulation material into predetermined sizes to serve as the thermal insulation substrate for the integrated board. Set a microporous structure on the surface of the thermal insulation substrate by laser drilling or chemical foaming to increase the contact area between the thermal insulation substrate and the subsequent bonding material, thereby improving the bonding effect. Compound the thermal insulation substrate with the metal finish combined with the colored stone to form an integrated board structure.

[0034] The present invention is further specifically described in detail. In step 4, the insulation material cutting machine adopts a CNC cutting machine. The insulation material includes polystyrene foam board, rock wool board and polyurethane foam board. The micropore diameter is 50-200 μm and the porosity of the micropore is 30% to 60%. It is precisely cut according to the preset size parameters. The size error of the insulation substrate after cutting is controlled within ±1mm; the composite method adopts adhesive composite, and the adhesive is evenly coated on the contact surface of the insulation substrate or the metal finish combined with the colored stone. The adhesive is an epoxy resin adhesive or a polymer cement-based adhesive. The adhesive comprises nanofibers having a length of 10-50 μm, a diameter of 50-200 nm, and a mass fraction of 0.1% to 0.3%. The nanofibers enhance the toughness and crack resistance of the adhesive. The thermal insulation substrate and the metal finish with the colored stone are bonded and composited by the adhesive. The adhesive is applied by scraping and spraying. The adhesive has a coating thickness of 0.5 to 1.5 mm, ensuring a firm bond between the thermal insulation substrate and the metal finish with the colored stone. The nanofibers are carbon nanofibers or polyacrylonitrile nanofibers.

[0035] Step 5: The composite colored stone metal thermal insulation decorative integrated board is subjected to overall curing and shaping. The composite colored stone metal thermal insulation decorative integrated board is placed in a constant temperature and humidity environment for curing and shaping. At the same time, during the curing process, a periodically changing low-frequency electromagnetic field is applied around the colored stone metal thermal insulation decorative integrated board. The low-frequency electromagnetic field promotes the movement and cross-linking reaction between the bonding material molecules, accelerates the curing process, and improves the curing quality.

[0036] The present invention further specifically details that in step five, the curing temperature of the colored stone metal thermal insulation decorative integrated board is 20-40°C, the curing humidity of the colored stone metal thermal insulation decorative integrated board is 50%-70%, the curing time of the colored stone metal thermal insulation decorative integrated board is 24-72 hours, the frequency of the low-frequency electromagnetic field is 10-100 Hz, and the intensity of the low-frequency electromagnetic field is 0.1-0.5 T;

[0037] As can be seen from the above, in step 1, the metal finish is first cleaned, and the oil, dust and impurities on the surface of the metal finish are removed by physical methods, so that the surface of the metal finish is clean and flat, providing a good foundation for subsequent processing. Subsequently, the metal finish is micro-etched with an etching solution. The etching solution is an acidic solution, in which hydrogen ions react chemically with the metal surface to form tiny pits and protrusions on the metal surface, thereby increasing the roughness and specific surface area of ​​the metal finish surface. According to claim 2, by controlling the concentration of hydrogen ions in the etching solution, the etching time and the etching depth, the microstructure of the metal surface can be accurately controlled, so that more mechanical bite points are formed between the subsequently sprayed colored stone and the metal finish, significantly improving the bonding strength between the colored stone and the metal finish, and preventing the colored stone from falling off during use;

[0038] In step 2, the colored stone raw material is pretreated and the colored stone is immersed in a solution containing a non-ionic surfactant. The surfactant molecules have a hydrophilic group and a hydrophobic group, and can be adsorbed on the surface of the colored stone in the solution, thereby reducing the surface tension of the colored stone surface and improving the wettability of the colored stone surface. The mass fraction of the surfactant in the solution and the immersion time are controlled so that the surface of the colored stone can be better infiltrated by the subsequent bonding material, thereby enhancing the adhesion between the colored stone and the bonding material. After that, the pretreated colored stone is evenly sprayed on the pretreated metal finishing raw material using a spray gun. By controlling the spraying pressure and spraying distance of the spray gun, it is ensured that the colored stone can be evenly covered on the metal finishing surface, forming a beautiful colored stone layer with a certain thickness.

[0039] In step three, the metal finishing material sprayed with the colored stone raw material is placed in an oven for hot air curing. The hot air can provide heat for the combination of the colored stone raw material and the metal finishing raw material, promote the physical and chemical interaction between the two, and make the colored stone and the metal finish initially combined. At the same time, during the hot air curing process, the solution containing nano-silica particles is atomized by an ultrasonic atomizer to form an atomized gas containing nano-silica particles, and intermittently sprayed into the oven. The nano-silica particles have an extremely small particle size (10-50nm) and a large specific surface area. The mass fraction of the nano-silica particles in the solution, the spraying time, the interval time, the hot air temperature, the wind speed and the action time are controlled. The nano-silica particles can fill the tiny gaps between the colored stone raw material and the metal finishing raw material. These nanoparticles can not only increase the roughness of the bonding interface, but also interact with the molecules on the surface of the colored stone and the metal finish to form chemical bonds or physical adsorption, thereby significantly enhancing the bonding strength, and effectively preventing the colored stone from falling off, cracking, bulging and the like after being combined with the metal finish.

[0040] In step 4, first, the thermal insulation material (such as polystyrene foam board, rock wool board and polyurethane foam board) is cut into a predetermined size by a CNC cutting machine as the thermal insulation substrate of the integrated board, and a microporous structure is set on the surface of the thermal insulation substrate by laser drilling or chemical foaming. The pore size and porosity of the micropores are controlled to increase the contact area between the thermal insulation substrate and the subsequent bonding material, thereby improving the bonding effect. Then, an epoxy resin adhesive or a polymer cement-based adhesive is used to compound the thermal insulation substrate with the metal finish combined with the colored stone, and nanofibers (such as carbon nanofibers or polyacrylonitrile nanofibers) are added to the adhesive. The nanofibers have high strength and high toughness. The length, diameter and mass fraction of the nanofibers are controlled. The nanofibers can form a three-dimensional network structure in the adhesive, thereby enhancing the toughness and crack resistance of the adhesive, ensuring that the thermal insulation substrate and the metal finish combined with the colored stone are firmly bonded to form a stable integrated board structure;

[0041] In step five, the composite colored stone metal thermal insulation decorative integrated board is placed in a constant temperature and humidity environment for curing and shaping. During the curing process, a periodically changing low-frequency electromagnetic field is applied to control the curing temperature, humidity, time, and frequency and intensity of the low-frequency electromagnetic field. The low-frequency electromagnetic field can generate an alternating electromagnetic force, which promotes the movement and cross-linking reaction between the bonding material molecules. The intermolecular movement speed is accelerated, and the cross-linking reaction is more sufficient, thereby accelerating the curing process, improving the curing quality, and making the internal bonding of the integrated board stronger and the performance more stable.

[0042] Through the configuration of the above technical solution, during the metal finish pretreatment stage, an acidic etching solution is used for micro-etching. By precisely controlling the concentration of hydrogen ions in the etching solution, the etching time, and the etching depth, a microscopic rough structure is formed on the metal finish surface, significantly increasing the roughness and specific surface area of ​​the metal finish surface. This microstructure provides more mechanical engagement points for the combination of the colored stone and the metal finish, greatly improving the subsequent bonding strength between the colored stone and the metal finish, effectively preventing the colored stone from falling off during use, and ensuring the long-term stability and aesthetics of the product.

[0043] The colored stone raw materials are pretreated and immersed in a solution containing a non-ionic surfactant to improve the wettability of the colored stone surface. By controlling the mass fraction of the surfactant and the immersion time, the colored stone surface can be better infiltrated by the subsequent bonding material, thereby enhancing the adhesion between the colored stone and the bonding material and further improving the bonding stability of the colored stone on the metal finish.

[0044] During the hot air curing process, atomized gas containing nano-silica particles is intermittently sprayed into the oven. Nano-silica particles have extremely small particle size and large specific surface area, and can fill the tiny gaps between the colored stone raw materials and the metal finishing raw materials. By precisely controlling the mass fraction, particle size, spraying time, interval time, as well as the hot air temperature, wind speed and action time of the nano-silica particles, the nano-silica particles not only increase the roughness of the bonding interface, but also interact with the molecules on the surface of the colored stone and the metal finishing to form chemical bonds or physical adsorption, significantly enhancing the bonding strength, effectively preventing problems such as cracking and bulging after the colored stone and metal finishing are combined, and improving the overall quality of the product;

[0045] In the process of compounding the thermal insulation substrate and the metal finish combined with the colored stone, an epoxy resin adhesive or a polymer cement-based adhesive is used, and nanofibers (such as carbon nanofibers or polyacrylonitrile nanofibers) are added to the adhesive. By controlling the length, diameter and mass fraction of the nanofibers, the nanofibers form a three-dimensional network structure in the adhesive, thereby enhancing the toughness and crack resistance of the adhesive. At the same time, a microporous structure is provided on the surface of the thermal insulation substrate, which increases the contact area between the thermal insulation substrate and the adhesive material, improves the bonding effect, ensures a strong bond between the thermal insulation substrate and the metal finish combined with the colored stone, and further enhances the structural stability and durability of the product.

[0046] During the overall curing and shaping stage, the composite colored stone metal thermal insulation decorative integrated board is placed in a constant temperature and humidity environment, and a periodically changing low-frequency electromagnetic field is applied around it. By precisely controlling the curing temperature, humidity, time, and frequency and intensity of the low-frequency electromagnetic field, the low-frequency electromagnetic field can generate alternating electromagnetic forces, promoting the movement and cross-linking reaction between the bonding material molecules, and accelerating the curing process. This not only shortens the production cycle and improves production efficiency, but also makes the bonding reaction more complete, improves the curing quality, and makes the internal bonding of the integrated board stronger and the performance more stable.

[0047] During the colored stone spraying process, a spray gun is used for spraying. The spraying pressure and spraying distance of the spray gun are precisely controlled to ensure that the colored stone can be evenly sprayed on the metal surface. This precise spraying control ensures the uniformity and consistency of the colored stone distribution on the product surface, improving the decorative effect of the product. During the thermal insulation substrate cutting process, a CNC cutting machine is used to perform precise cutting according to preset dimensional parameters, and the dimensional error of the thermal insulation substrate after cutting is controlled within ±1mm. This high-precision cutting process ensures the dimensional accuracy of the thermal insulation substrate, provides a good foundation for the subsequent composite process, and ensures the consistency and stability of the overall product size.

[0048] This preparation process has great flexibility in material selection. The raw material of the colored stone is basalt, which is hard, wear-resistant and corrosion-resistant, providing good decorativeness and durability for the product. The insulation materials include polystyrene foam board, rock wool board and polyurethane foam board and other types. Appropriate insulation materials can be selected according to different usage requirements and environmental conditions, thereby enhancing the adaptability and market competitiveness of the product.

[0049] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A preparation process of a colored stone metal thermal insulation decorative integrated board, characterized in that: include: Step 1: Pre-treat the metal finishing material, clean the metal finishing, remove oil, dust and impurities on the surface of the metal finishing, and after cleaning, micro-etch the metal finishing material with an etching solution; Step 2: spraying the colored stone raw materials, spraying the colored stone raw materials evenly on the pretreated metal finishing raw materials. Before spraying, pretreat the colored stone and soak the colored stone in a solution containing a surfactant for 10 to 30 minutes; Step 3: Hot air curing the metal finishing material sprayed with the colored stone raw material, placing the metal finishing material sprayed with the colored stone raw material in an oven, and combining the colored stone raw material and the metal finishing material by hot air; and during the hot air curing process, intermittently spraying atomized gas containing nano-silica particles into the oven; Step 4: Compound the thermal insulation substrate. Cut the thermal insulation material into predetermined sizes to serve as the thermal insulation substrate for the integrated board. Set a microporous structure on the surface of the thermal insulation substrate by laser drilling or chemical foaming to form the microporous structure. Compound the thermal insulation substrate with the metal finish combined with the colored stone to form an integrated board structure. Step 5: The composite colored stone metal thermal insulation decorative integrated board is integrally cured and shaped, and the composite colored stone metal thermal insulation decorative integrated board is placed in a constant temperature and humidity environment for curing and shaping; at the same time, during the curing process, a periodically changing low-frequency electromagnetic field is applied around the colored stone metal thermal insulation decorative integrated board.

2. The preparation process of the colored stone metal thermal insulation decorative integrated board according to claim 1, characterized in that: In the step 1, the etching solution is acidic, the concentration of hydrogen ions in the etching solution is 0.5 to 2 mol / L, the etching time is 30 to 90 seconds, and the etching depth is 1 to 3 μm.

3. The preparation process of the colored stone metal thermal insulation decorative integrated board according to claim 1, characterized in that: In step 2, the spraying equipment uses a spray gun, the spraying pressure of the spray gun is 0.3-0.5 MPa, the spraying distance of the spray gun is 20-30 cm, the surfactant is a non-ionic surfactant, the material of the colored stone raw material is basalt, the particle size range of the colored stone raw material is 1-5 mm, and the mass fraction of the surfactant in the solution is 0.1%-0.5%.

4. The preparation process of the colored stone metal thermal insulation decorative integrated board according to claim 1, characterized in that: In step three, a temperature sensor and a wind speed sensor are provided in the oven, and the temperature sensor and wind speed sensor are used to monitor and adjust the hot air temperature and wind speed in real time. The hot air speed is 2 to 5 m / s, the hot air temperature is 120-180°C, the hot air action time is 30 to 60 minutes, the particle size of the nano-silica particles is 10-50 nm, and the injection interval time is 5 to 10 minutes.

5. The process for preparing the colored stone and metal thermal insulation decorative integrated board according to claim 1, characterized in that: In step 4, the insulation material cutting machine adopts a CNC cutting machine, the insulation material includes polystyrene foam board, rock wool board and polyurethane foam board, the micropore diameter is 50-200 μm, and the porosity of the micropores is 30% to 60%.

6. The process for preparing the colored stone and metal thermal insulation decorative integrated board according to claim 1, characterized in that: The thermal insulation substrate and the metal finish combined with the colored stone are bonded and compounded by an adhesive. The adhesive is applied by scraping and spraying, and the coating thickness of the adhesive is 0.5 to 1.5 mm.

7. The process for preparing the colored stone and metal thermal insulation decorative integrated board according to claim 1, characterized in that: In step five, the curing temperature of the colored stone metal thermal insulation decorative integrated board is 20-40° C., the curing humidity of the colored stone metal thermal insulation decorative integrated board is 50% to 70%, and the curing time of the colored stone metal thermal insulation decorative integrated board is 24 to 72 hours.

8. The process for preparing the colored stone and metal thermal insulation decorative integrated board according to claim 1, characterized in that: The frequency of the low-frequency electromagnetic field is 10-100 Hz, and the intensity of the low-frequency electromagnetic field is 0.1-0.5T.

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