Waterproof metal sheet and method of manufacturing the same

Abstract

The application discloses a waterproof metal plate and a manufacturing method thereof. The manufacturing method of the waterproof metal plate comprises the following steps: coating a composite coating on the surface of a metal plate to obtain a first pre-coated plate; performing a heating treatment on the first pre-coated plate to make the composite coating uniformly distributed on the surface of the metal plate, so as to obtain a coated metal plate covered with a high-adhesion composite coating layer; coating a polymer mixture on the composite coating layer of the coated metal plate to obtain a second pre-coated plate; and performing a cooling treatment on the second pre-coated plate to obtain a waterproof metal plate with a multilayer composite structure, wherein the waterproof metal plate with the multilayer composite structure comprises the metal plate, the composite coating layer and a polymer material layer which are arranged in a stacking mode. The manufacturing method of the waterproof metal plate can continuously produce the waterproof metal plate by coating the composite coating on the metal plate and coating the polymer mixture in the form of a fluid on the composite coating to respectively form the composite coating layer and the polymer material layer, and the waterproof metal plate is formed together with the metal plate.

Description

Technical Field

[0001] This application belongs to the field of building construction materials technology, and in particular relates to a waterproof metal plate and its manufacturing method. Background Technology

[0002] At present, single-layer roofing systems are generally divided into mechanical fixing, bonding, and loose-lay systems. Among them, the bonding system is to bond the waterproof layer to the metal roof base layer by applying adhesive on site, or directly composite the waterproof layer roll material, prefabricated adhesive film, and metal plate at the production factory, also known as composite metal plate, and then lay the composite metal plate.

[0003] The lengths, thicknesses, and required lamination temperatures of the various layers in composite metal panels differ significantly. During actual lamination of several materials, the inconsistent lengths of the three materials can easily lead to production interruptions and material waste in single-layer roofing systems. Furthermore, the precise control of the lamination temperature for the three materials presents significant challenges. In addition, due to thermal expansion and contraction after bonding, it is difficult to guarantee the long-term effectiveness of a single-layer roofing system. Under the combined effects of tension and thermal expansion and contraction, significant stress exists between the metal panels and the roofing membrane due to the different specifications of the materials. This stress can cause premature failure of the single-layer roofing system after the adhesive layer ages. Summary of the Invention

[0004] This application provides a waterproof metal plate and its manufacturing method, which reduces the difficulty of temperature control during the production of waterproof metal plates by various layers of materials, enables continuous production of waterproof metal plates, has high production efficiency, and produces waterproof metal plates of uniform quality.

[0005] In a first aspect, this application provides a method for manufacturing a waterproof metal plate, the method comprising:

[0006] A composite coating is applied to the surface of a metal plate to obtain a first pre-coated plate;

[0007] The first pre-coated plate is heated to make the composite coating evenly distributed on the surface of the metal plate, so as to obtain a coated metal plate with a high-adhesion composite coating.

[0008] A polymer mixture is applied to a composite coating on a coated metal sheet to obtain a second pre-coated sheet.

[0009] The second pre-coated plate is cooled to obtain a multi-layer composite waterproof metal plate, which includes stacked metal plates, a composite coating and a polymer material layer.

[0010] In one embodiment of this application, the method for manufacturing a waterproof metal plate includes:

[0011] The second pre-coated plate is cooled down to a preset temperature.

[0012] At a preset temperature, a functional coating is applied to the side of the metal plate of the second pre-coated plate away from the composite coating. The functional coating forms a functional coating layer to obtain a multi-layer composite waterproof metal plate. The multi-layer composite waterproof metal plate includes a functional coating layer, a metal plate, a composite coating, and a polymer material layer stacked together.

[0013] In one embodiment of this application, the metal plate is obtained according to the following steps:

[0014] The metal sheet undergoes surface treatment to obtain a pretreated metal sheet;

[0015] The pre-treated metal plate is preheated.

[0016] In one embodiment of this application, surface treatment of the metal plate includes:

[0017] Remove dirt from the surface of the metal plate to obtain a clean metal plate;

[0018] Chemical and / or physical treatments are applied to clean metal sheets to improve surface adhesion.

[0019] In one embodiment of this application, the chemical treatment of the clean metal plate includes:

[0020] Use acid or alkali to passivate the cleaned metal plate to improve the surface adhesion of the metal plate.

[0021] In one embodiment of this application, the physical treatment of the clean metal plate includes:

[0022] The clean metal sheet is treated with a sanding or plasma treatment to improve the surface adhesion of the metal sheet.

[0023] In one embodiment of this application, the polymer mixture is obtained according to the following steps:

[0024] Premixing polymer raw materials yields a polymer raw material mixture;

[0025] The polymer raw material mixture is heated, mixed, and extruded to obtain the polymer mixture.

[0026] In one embodiment of this application, applying the polymer mixture to the composite coating of the coated metal plate includes:

[0027] The polymer mixture is applied to the composite coating of the coated metal sheet using pressure rollers.

[0028] In one embodiment of this application, the polymer material layer is a composite layer composed of any one or more of polyethylene, polypropylene, polyvinyl chloride, chlorinated polyethylene, ethylene propylene diene monomer (EPDM) rubber, and ethylene-propylene copolymer.

[0029] In one embodiment of this application, the composite coating is selected from one or more combinations of epoxy resin, polyurethane, acrylate, and chloroprene rubber adhesives.

[0030] In one embodiment of this application, the metal plate is selected from galvanized metal plate, aluminum plate, aluminum-magnesium-manganese plate, and stainless steel plate.

[0031] In one embodiment of this application, the functional coating is selected from anti-corrosion coatings, thermal insulation materials, and vibration damping, sound insulation, and sound absorption materials.

[0032] Secondly, this application provides a waterproof metal plate, which is manufactured according to the above-described method for manufacturing waterproof metal plates.

[0033] According to another embodiment of this application, the waterproof metal plate includes:

[0034] A metal plate, including a first side and a second side disposed opposite to each other along its own thickness direction;

[0035] A composite coating is applied to the first side of the metal plate;

[0036] A polymer material layer is disposed on the side of the composite coating away from the metal plate.

[0037] According to another embodiment of this application, the waterproof metal plate further includes:

[0038] The functional coating layer is disposed on the second side of the metal plate away from the composite coating.

[0039] The waterproof metal plate and its manufacturing method according to embodiments of this application apply a composite coating to the surface of a metal plate and then coats a polymer mixture in a semi-fluid form onto the composite coating layer of the coated metal plate. This allows for continuous production of waterproof metal plates by applying appropriate composite coatings and polymer mixtures according to the specifications and supply of the metal plate. After the second pre-coated plate cools down, the composite coating, polymer mixture, and metal plate are layered to form a waterproof metal plate comprising a metal plate, a composite coating, and a polymer material layer. This prevents production interruptions and material waste, improving the production efficiency of the waterproof metal plate. Furthermore, by sequentially coating the composite coating and polymer mixture, the quality of the produced waterproof metal plates is consistent, avoiding system failure due to adhesive aging caused by varying stresses in the materials during production. The manufacturing method of the waterproof metal plate according to embodiments of this application reduces the difficulty of temperature control during the production of the metal plate, composite coating, and polymer mixture. The method is simple to operate, and the resulting waterproof metal plate exhibits better adhesion and composite strength between the metal plate, composite coating, and polymer material layers. Attached Figure Description

[0040] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic flowchart of the manufacturing method of the waterproof metal plate provided in the embodiments of this application;

[0042] Figure 2 This is a schematic diagram of the structure of polymer mixture extrusion roll coating provided in the embodiments of this application;

[0043] Figure 3 This is a schematic diagram of the structure of polymer mixture extrusion roll coating provided in the embodiments of this application;

[0044] Figure 4 This is a schematic diagram of the structure of the waterproof metal plate provided in Embodiment 1 of this application.

[0045] Explanation of reference numerals in the attached figures:

[0046] 1. Metal plate; 2. Composite coating; 3. Polymer material layer; 4. Functional coating layer; 5. High-temperature semi-fluid polymer mixture; 6. Polymer mixture extrusion port; 7. Pressure roller. Detailed Implementation

[0047] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0049] The single-layer fully adhesive roofing system mainly consists of a polymer waterproofing layer, a pre-cast adhesive membrane, and a metal layer combined together. It is generally bonded using an adhesive system, either by applying adhesive on-site to bond the waterproofing layer to the metal roof substrate, or by bonding the waterproofing membrane / pre-cast adhesive membrane to the metal substrate at the factory. This process has been in use for a long time, but the inventors discovered that its effectiveness is limited by various factors during actual construction. It requires a temperature not lower than 5°C, and both adhesive application and bonding require a large number of skilled workers working in unison. If even one worker makes a mistake, the entire waterproofing membrane can easily become hollow, creating water seepage channels. Especially with complex corrugated steel roofing substrates, even after successful bonding, long-term effectiveness is difficult to guarantee due to thermal expansion and contraction.

[0050] Furthermore, commercially available laminated metal sheets typically use an adhesive film to bond a waterproof membrane roll to the metal sheet. This method requires the membrane roll and adhesive film to be manufactured separately before being laminated with the metal sheet. However, due to the thickness of the membrane roll, the thinness of the adhesive film, and the market's standardized specifications for the metal membrane roll, it is easy for one of the three components to be unavailable during actual lamination production. This can lead to frequent interruptions in the continuous production of the waterproof sheet, affecting production efficiency and wasting production materials.

[0051] Meanwhile, the use of film-coated multi-material lamination requires different temperatures for bonding the film to the metal sheet and the metal sheet to the roll. When the film is thick and the thickness of the composite roll varies significantly, precise temperature control is necessary during the actual lamination process. For example, during lamination, since the roll, film, and metal roll are already formed, the materials are under tension to ensure a good lamination effect. Furthermore, the roll and metal sheet require heating during lamination. Under the combined effects of tension and thermal expansion / contraction, significant stress exists between the metal sheet and the roll. This stress makes the laminated sheet prone to premature failure after the adhesive layer ages. Additionally, film-coated metal sheets require specific metal sheet requirements and have significant limitations on surface and material properties, severely restricting the product's market application. Moreover, the current lamination effect of this type of product is limited, with actual lamination strength around 5N / mm and enterprise standards reaching as low as 2.5N / mm. The lamination strength is low, and weather resistance and durability need improvement.

[0052] To address the problems in the prior art, this application provides a waterproof metal plate and a method for manufacturing the same.

[0053] The manufacturing method of the waterproof metal plate provided in the embodiments of this application will be described first below. Figure 1 A schematic flowchart illustrating a method for manufacturing a waterproof metal plate according to an embodiment of this application is shown. Figure 1 As shown, the manufacturing method of the waterproof metal plate is carried out according to the following steps:

[0054] S1. Coating the surface of the metal plate with a composite coating to obtain the first pre-coated plate;

[0055] S2. Heat the metal plate of the first pre-coated plate to make the composite coating evenly distributed on the surface of the metal plate, so as to obtain a coated metal plate with a high-adhesion composite coating.

[0056] S3. Apply the polymer mixture onto the composite coating of the coated metal plate to obtain the second pre-coated plate;

[0057] S4. Cool the second pre-coated plate to obtain a multi-layer composite waterproof metal plate. The multi-layer composite waterproof metal plate includes stacked metal plates, composite coatings and polymer material layers.

[0058] The method for manufacturing a waterproof metal plate according to embodiments of this application involves coating a composite coating onto the surface of a metal plate and then applying a polymer mixture in a semi-fluid form onto the composite coating layer of the coated metal plate. This allows for continuous production of waterproof metal plates by applying appropriate composite coatings and polymer mixtures based on the specifications and supply of the metal plate. After the second pre-coated plate cools down, the composite coating, polymer mixture, and metal plate are layered to form a waterproof metal plate comprising a metal plate, a composite coating, and a polymer material layer. This prevents production interruptions and material waste, improving production efficiency. Furthermore, by sequentially coating the composite coating and polymer mixture, the quality of the produced waterproof metal plates is consistent, preventing system failure due to adhesive aging caused by varying stresses in the materials during production. The manufacturing method of the waterproof metal plate according to embodiments of this application also reduces the difficulty of temperature control during the production of the metal plate, composite coating, and polymer mixture. The method is simple to operate, and the resulting waterproof metal plate exhibits better adhesion and composite strength between the metal plate, composite coating, and polymer material.

[0059] In the embodiments of this application, the first pre-coated plate is a metal plate with a composite coating on one side. Either side of the metal plate in the thickness direction is acceptable. The coated metal plate is a coated metal plate formed by heating the first pre-coated plate to uniformly distribute the composite coating on its surface, creating a high-adhesion composite coating. The second pre-coated plate is a plate with a polymer mixture coated on the side of the coated metal plate facing away from the metal plate. Cooling the second pre-coated plate directly yields a waterproof metal plate, allowing for rapid cooling at a rate that does not cause stress on the waterproof metal plate.

[0060] In one embodiment of this application, the composite coating is selected from one or more combinations of epoxy resin, polyurethane, acrylate, and chloroprene rubber adhesives.

[0061] For example, epoxy resin adhesives such as HARDENER AV138M / HV998, Sika 31STP, and LOCTITE E-214HP can be selected. Polyurethane adhesives such as YANTAI TS-8810 can be selected. Adhesives of various grades / product numbers / brands, such as PUR 9720, XPO 1050, and Shouxing PU88 / PU500, are available. For polyacrylate adhesives, grades / product numbers / brands such as LOCTITE AA326, LOCTITE AA3342, and Bezos 14166 are suitable. For neoprene rubber adhesives, grades / product numbers / brands such as 3M 1357, Sarnacol 808, and HBFuller 12986c are suitable. All of the above composite coatings are available through commercial channels.

[0062] In the embodiments of this application, a composite coating is applied to any one side surface of the metal plate. This can be achieved using coating methods including, but not limited to, spraying, roller coating, and brush coating. Optionally, spraying is preferred. The side of the metal plate to which the composite coating is applied is the first side, and the other side of the metal plate opposite to the first side in the thickness direction is the second side.

[0063] In the embodiments of this application, the metal plate of the first pre-coated plate coated with the composite coating is heated to the temperature at which the bonding strength of the composite coating is at its highest point, i.e., the composite temperature of the composite coating. The heating time in this process can make the composite coating more evenly dispersed on the surface of the metal plate and can make the bonding strength of the composite coating reach its highest point, so as to better bond with the polymer mixture.

[0064] In the embodiments of this application, the final temperature for heating the metal plate of the first pre-coated plate is 120°C to 150°C. The curing temperature of the composite coating is generally 120°C. Heating the first pre-coated plate to the final temperature of 120°C to 150°C allows the composite coating to be distributed more evenly on the surface of the metal plate and maximizes the bonding strength of the composite coating.

[0065] In one embodiment of this application, the metal plate is obtained according to the following steps:

[0066] S10. Perform surface treatment on the metal plate to obtain a pretreated metal plate;

[0067] S11. Preheat the pretreated metal plate.

[0068] In embodiments of this application, providing a metal sheet involves first unwinding a rolled metal sheet and then performing surface treatment on the metal sheet to clean its surface and create a surface suitable for coating with the composite coating, resulting in a pretreated metal sheet. The pretreated metal sheet is then preheated to obtain a metal sheet to be coated with the composite coating. This preheating treatment enhances the surface activity of the metal sheet, improves the adhesion of the composite coating, and prevents the composite coating from drying out due to excessive heating time in the subsequent heating step S3 of the manufacturing process.

[0069] In some embodiments of this application, the temperature for preheating the pretreated metal plate is 80°C to 100°C, so that the temperature of the pretreated metal plate reaches 80°C to 100°C at the end of the preheating process, thereby drying the surface of the metal plate, increasing the surface activity of the metal plate, and improving the adhesion of the composite coating.

[0070] In one embodiment of this application, surface treatment of the metal plate includes:

[0071] S101. Remove dirt from the surface of the metal plate to obtain a clean metal plate;

[0072] S102. Apply chemical and / or physical treatment to the clean metal plate to improve surface adhesion.

[0073] In the embodiments of this application, removing contaminants from the metal plate surface includes removing oil stains and other particulate matter or adhesives from the metal plate surface to obtain a clean metal plate, thus avoiding affecting the adhesion performance between the metal plate and the composite coating. During the process of removing contaminants from the metal plate surface, cleaning agents can be used, or brushes or roller brushes can be used to remove particulate matter, dust, dirt, or other types of contaminants that may adhere to the surface. Existing cleaning agents for metal surfaces are available through commercial channels.

[0074] In one embodiment of this application, the chemical treatment of the clean metal plate includes:

[0075] Use acid or alkali to passivate the cleaned metal plate to improve the surface adhesion of the metal plate.

[0076] In one embodiment of this application, the metal plate is selected from galvanized steel plate, aluminum plate, aluminum-magnesium-manganese plate, and stainless steel plate. The metal plate can be selected with a width of 600mm to 2000mm and a thickness of 0.5mm to 1.0mm, and its length can be set as needed. For example, the metal plate can be selected with a width of 1000mm, 600mm, or 1200mm and a thickness of 0.5mm to 0.8mm.

[0077] For different metal plates, appropriate acid or alkali solutions can be selected for chemical passivation treatment of the metal plate surface. For example, using aluminum plates, concentrated nitric acid or concentrated sulfuric acid can be used for passivation treatment, or a potassium dichromate or potassium chromate solution with a concentration of 30 g / L to 50 g / L can be used for acidic passivation treatment at a temperature of 90°C to 95°C for 5 to 10 minutes. Optionally, the concentration of the potassium dichromate or potassium chromate solution is 50 g / L. Alternatively, an alkaline passivation treatment of 20 g / L chromic anhydride (CrO4) can be performed on the aluminum plate at room temperature for 5 to 15 seconds. Alternatively, an aqueous solution of sodium magnesium aluminum nitrate containing sodium fluorosilicate and aluminum nitrate can be used for passivation treatment of the aluminum plate by methods including but not limited to spraying, immersion, and spraying. Alternatively, the aluminum plate can be immersed in an acidic solution containing phosphate and nitric acid for passivation treatment.

[0078] In one embodiment of this application, the physical treatment of the clean metal plate includes:

[0079] The clean metal sheet is treated with a sanding or plasma treatment to improve the surface adhesion of the metal sheet.

[0080] In the embodiments of this application, the surface of the clean metal plate is subjected to a sanding treatment or a plasma treatment to give the metal plate a certain surface roughness, such as making the surface roughness R... a The thickness reaches 1μm to 300μm, improving the surface adhesion of the metal plate and thus enabling better bonding with the composite coating.

[0081] For example, abrasives can be used to sand the surface of clean metal plates, or plasma treatment can be used to improve the surface adhesion of the metal plates. For plasma treatment, appropriate plasma generating equipment can be selected for physical treatment depending on the metal plate. For example, a plasma generator can be used to treat the surface of an aluminum plate. High-energy plasma is generated by ionizing injected oxygen through electrodes at a frequency of 15kHz–25kHz and a voltage of 5kV–7kV within the plasma generator chamber. Active plasma treats the aluminum plate surface at a speed of 10m / min–20m / min. The active plasma physically bombards and chemically reacts with the object being cleaned. Atoms and ions bombard the surface to be cleaned at high energy and high speed, oxidizing and decomposing the dirt molecules, which are then extracted by a vacuum pump. Simultaneously, a dense oxide layer is rapidly formed on the aluminum plate surface, improving the corrosion resistance of the metal plate itself. The impact also creates a micro-rough surface on the aluminum plate, improving the surface adhesion of the metal plate.

[0082] In the embodiments of this application, chemical and physical treatments can be used individually or in combination; that is, both chemical and physical treatments can be performed. When surface treating a metal plate, removing contaminants from the surface of the metal plate and performing chemical and / or physical treatments can be done in any order. Exemplarily, during surface treatment, physical and / or chemical treatments can be performed first, followed by the removal of surface contaminants. Alternatively, surface contaminants can be removed first, followed by chemical and / or physical treatments.

[0083] In one embodiment of this application, the polymer mixture can be obtained according to the following steps:

[0084] S30. Premix the polymer raw materials to obtain a polymer raw material mixture;

[0085] S31. Heat, mix, and extrude the polymer raw material mixture to obtain the polymer mixture.

[0086] In one embodiment of this application, applying the polymer mixture to the composite coating of the coated metal plate includes:

[0087] The polymer mixture is applied to the composite coating of the coated metal sheet using a pressure roller to obtain the second pre-coated sheet.

[0088] In the embodiments of this application, the metal plate and the polymer mixture can be provided simultaneously so that the composite coating and the polymer mixture can be applied in a timely manner after the metal plate has been preheated.

[0089] In one embodiment of this application, the polymer material layer is a composite layer composed of any one or more of polyethylene, polypropylene, polyvinyl chloride, chlorinated polyethylene, ethylene propylene diene monomer (EPDM) rubber, and ethylene-propylene copolymer.

[0090] In the embodiments of this application, the raw materials for the polymer material layer are first pre-mixed and dispersed to obtain a polymer raw material mixture. Then, the polymer raw material mixture is heated, mixed, and extruded into a high-temperature semi-fluid polymer mixture 5. The composite coating on the metal plate is then bonded to the semi-fluid polymer mixture 5. At this time, as... Figure 2 and Figure 3 As shown, a semi-fluid polymer mixture 5 is extruded through a polymer mixture extrusion port 6 onto a composite coating of a metal plate. The mixture is then pressed by the pressure rollers 7 of the processing equipment at a preset distance to a predetermined material thickness, resulting in a second pre-coated plate. After the semi-fluid polymer mixture 5 is extruded and pressed, the second pre-coated plate is cooled to obtain a waterproof metal plate. The preset distance can be adjusted according to the required thickness of the waterproof metal plate, ensuring that the semi-fluid polymer mixture forms a polymer material layer of a certain thickness on the composite coating. The preset distance can be achieved by adjusting the distance between the pressure rollers 7 in the vertical direction of the processing equipment. This allows the production line to customize waterproof metal plate products of different specifications according to demand. For multiple different specifications of products, production does not need to be stopped and reloaded, and the thickness of the polymer material layer can be seamlessly controlled and switched. The polymer material layer serves as a waterproof layer, giving the waterproof metal plate its waterproof properties.

[0091] In one embodiment of this application, the thickness of the polymer material layer can be a standard thickness, such as 1.2, 1.5, or 1.8 mm, or a non-standard thickness of 0.8 or 2.0 mm can be formed by pressing with pressure rollers 7 to meet actual needs.

[0092] In one embodiment of this application, the method for manufacturing a waterproof metal plate includes:

[0093] S4. Cool the second pre-coated plate to reduce its temperature to a preset temperature.

[0094] S5. At a preset temperature, the functional coating is applied to the side of the metal plate of the second pre-coated plate away from the composite coating. The functional coating forms a functional coating layer to obtain a multi-layer composite waterproof metal plate. The multi-layer composite waterproof metal plate includes a functional coating layer, a metal plate, a composite coating, and a polymer material layer stacked together.

[0095] In the embodiments of this application, the second pre-coated plate coated with a polymer mixture is cooled to a preset temperature. A functional coating can then be applied to the side of the metal plate of the second pre-coated plate opposite to the composite coating. The residual heat of the polymer mixture is used to dry the functional coating, allowing it to bond with the metal plate and form a functional coating layer. The manufacturing method of the waterproof metal plate in this application embodiment can effectively improve production efficiency, save time, and conserve energy.

[0096] In one embodiment of this application, the functional coating is selected from anti-corrosion coatings, thermal insulation materials, and vibration damping and sound-absorbing materials, so that the waterproof metal plate simultaneously or individually possesses the effects of anti-corrosion, thermal insulation, and vibration damping and sound insulation. The thermal insulation material can be aerogel, and the vibration damping and sound-absorbing material can be a porous and elastic material. The functional coating can also be applied by methods including but not limited to spraying, scraping, brushing, and rolling, with spraying being the preferred method for applying the functional coating to the metal plate. For the waterproof metal plate requiring a functional coating layer, the second pre-coated plate can be cooled to a preset temperature first. After the functional coating is applied by spraying or scraping / rolling, the functional coating is dried by the residual heat of the polymer mixture at the preset temperature on the second pre-coated plate, forming the functional coating layer. After cooling to room temperature, a waterproof metal plate including the functional coating layer is obtained.

[0097] In the embodiments of this application, the remaining heat at the preset temperature is sufficient to dry the functional coating on the side of the metal plate away from the composite coating. That is, the preset temperature can be set accordingly based on the drying temperature of the different functional coatings. For example, the preset temperature is 80℃~100℃.

[0098] The manufacturing method of the waterproof metal plate in this application embodiment only requires that the metal plate, composite coating, and polymer mixture meet their respective temperatures. The composite coating can be applied to the surface of the metal plate by spraying, scraping, or roller coating. The polymer material layer on the surface of the waterproof metal plate can be produced by extrusion, and its thickness can be controlled at any time. Furthermore, since the raw materials are mixed and heated uniformly on-site before extrusion, the temperature is easier to control, allowing direct bonding with the composite coating on the metal plate. This reduces the difficulty of temperature control during the production of the metal plate, composite coating, and polymer mixture. Through the improvements in the above steps, the composite coating and polymer material can be applied layer by layer to the metal plate by gas spraying or semi-fluid coating. The composite coating and polymer mixture can be continuously supplied according to the specifications of the metal plate, enabling continuous production of waterproof metal plates, improving production efficiency, and ensuring uniform quality. The supply of composite coating and polymer mixture can also be interrupted at any time according to the material supply status of the metal plate, reducing raw material waste. Moreover, the composite coating coating process used in the waterproof metal plate results in better adhesion between the composite coating and the metal plate and polymer material layer. Furthermore, the polymer material layer is created by extruding and rolling a polymer mixture onto the composite coating of the metal plate. Compared to sheet pressing and bonding, this method better avoids the generation of bubbles and voids, preventing production quality problems at their source. The manufacturing method of the waterproof metal plate in this application embodiment has high production efficiency. Using the manufacturing method of the waterproof metal plate in this application embodiment, the production efficiency of waterproof metal plates can be increased by 16% to 25%, the composite strength reaches 6N / mm to 15N / mm, which is relatively high, and the durability is improved by 20% to 200%.

[0099] The manufacturing method of the waterproof metal sheet according to this application embodiment can save resources and costs. It adopts a single production line, and except for the length limitation of the metal sheet, both the composite coating and the polymer mixture are formed by spraying or extrusion rolling. Production can be carried out continuously, reducing production interruptions and material waste caused by different film materials and varying roll lengths. Furthermore, the roll layer formed by the composite coating and polymer material is not prefabricated in sheet form, eliminating the need for repeated forming and heating, thus effectively saving energy.

[0100] Secondly, this application provides a waterproof metal plate, which is manufactured according to the above-described method for manufacturing waterproof metal plates.

[0101] In some optional embodiments of this application, such as Figure 4 As shown, the waterproof metal plate includes: a metal plate 1, including a first side and a second side disposed along its own thickness direction; a composite coating 2 disposed on the first side of the metal plate 1; and a polymer material layer 3 disposed on the side of the composite coating 2 facing away from the metal plate 1.

[0102] In some optional embodiments of this application, the waterproof metal plate further includes a functional coating layer 4 disposed on the second side of the metal plate 1 away from the composite coating 2.

[0103] In the embodiments of this application, the first side of the thickness direction of the metal plate 1 is the side connected to the composite coating 2, and the second side is the side connected to the functional coating. The thickness direction of the metal plate 1 corresponds to the direction from the composite coating 2 to the functional coating 4, or the direction from the functional coating 4 to the composite coating 2.

[0104] Example 1

[0105] A waterproof metal plate, such as Figure 4 As shown, the waterproof metal plate includes, from bottom to top, a functional coating layer 4, a metal plate 1, a composite coating 2, and a polymer material layer 3, stacked sequentially. The functional coating layer 4 is disposed on the side of the metal plate 1 facing away from the composite coating 2. The metal plate 1 is a galvanized steel plate, the composite coating 2 is a structural layer formed by the epoxy resin adhesive LOCTITE E-214HP, the polymer material layer 3 is a polymer material layer mainly composed of ethylene-propylene copolymer, and the functional coating layer 4 is an anti-corrosion coating. The manufacturing method of the waterproof metal plate in this embodiment is as follows: Figure 2 and 3 As shown, follow these steps:

[0106] S1. A composite coating heat-sensitive adhesive is sprayed onto the upper surface of the metal plate 1 to obtain a first pre-coated plate; wherein, the metal plate is obtained according to the following steps:

[0107] S10. Provide galvanized steel sheet as the metal sheet, the specifications of the metal sheet are length × width × thickness = 400mm × 1000mm × 0.6mm, and perform surface treatment on the metal sheet, including:

[0108] S101. Use BONDERITE C-AK305 metal surface oil stain remover purchased from outside as a cleaning agent to remove oil stains from the surface of the metal plate. At the same time, use a roller brush to remove other dirt from the surface of the metal plate to obtain a clean metal plate.

[0109] S102. Then, the cleaned metal plate is sanded to reduce the surface roughness R of the metal plate. a To achieve a thickness of 3μm, the surface adhesion of the metal plate is improved, resulting in a pretreated metal plate.

[0110] S11. The pre-treated metal plate is preheated to a final temperature of 90°C to enhance its surface activity, resulting in a metal plate to be coated with the composite coating, which is then bonded to the composite coating. The composite coating is then sprayed onto the upper surface of the metal plate to be coated (i.e., the first surface of the metal plate), specifically an epoxy resin adhesive purchased from LOCTITE with the brand name E-214HP, with a coating thickness of 0.12 mm, thus obtaining the first pre-coated plate.

[0111] S2. The first pre-coated plate is heated to a final temperature of 125°C to make the composite coating LOCTITE E-214HP evenly distributed on the surface of the metal plate and improve the bonding strength of the composite coating, so as to obtain a coated metal plate covered with a high-adhesion composite coating; wherein, the upper part of the composite coating 2 is used to bond with the polymer mixture.

[0112] S3. The polymer mixture is applied onto the composite coating 2 of the coated metal sheet by roller pressing 7 to obtain the second pre-coated sheet; wherein, the polymer mixture is prepared according to the following steps:

[0113] S30. The raw material of the polymer material layer with brand name CA10A, which is mainly composed of ethylene-propylene copolymer, purchased from Keshun Waterproof Technology Co., Ltd., is premixed to obtain ethylene-propylene copolymer polymer raw material mixture.

[0114] S31. The ethylene-propylene copolymer polymer raw material mixture is heated and mixed to obtain the ethylene-propylene copolymer polymer mixture; then the heated and mixed ethylene-propylene copolymer polymer mixture is extruded and rolled onto the composite coating of the coated metal plate through roller 7, with a coating thickness of 1.2 mm, to obtain the second pre-coated plate;

[0115] S4. Cool the second pre-coated plate to a preset temperature of 80°C.

[0116] S5. At a preset temperature of 80°C, the functional coating, i.e. the anti-corrosion coating, is sprayed onto the side of the metal plate of the second pre-coated plate away from the composite coating 2. The functional coating forms a functional coating layer 4 to obtain a multi-layer composite waterproof metal plate. The multi-layer composite waterproof metal plate includes a functional coating layer 4, a metal plate 1, a composite coating 2, and a polymer material layer 3 stacked sequentially from bottom to top.

[0117] Example 2

[0118] A waterproof metal plate, such as Figure 4As shown, the waterproof metal plate includes, from bottom to top, a functional coating layer 4, a metal plate 1, a composite coating 2, and a polymer material layer 3, stacked sequentially. The functional coating layer 4 is disposed on the side of the metal plate 1 facing away from the composite coating 2. The metal plate 1 is an aluminum plate, the composite coating 2 is a structural layer formed by a polyurethane adhesive of brand name TS-8810 from Yantai, the polymer material layer 3 is a polymer material layer with polyethylene as the main material, and the functional coating layer 4 is an anti-corrosion coating. The manufacturing method of the waterproof metal plate in this embodiment is as follows: Figure 2 and 3 As shown, follow these steps:

[0119] S1. A composite coating heat-sensitive adhesive is sprayed onto the upper surface of the metal plate 1 to obtain a first pre-coated plate; wherein, the metal plate is obtained according to the following steps:

[0120] S10. Provide an aluminum sheet as the metal sheet, the specifications of which are length × width × thickness = 400mm × 1000mm × 0.8mm. Perform surface treatment on the metal sheet, including:

[0121] S101. The aluminum plate surface is subjected to acid passivation treatment using a potassium dichromate solution with a concentration of 50 g / L. The treatment temperature is 90℃ and the treatment time is 10 minutes to improve the surface adhesion of the metal plate and obtain a pretreated metal plate.

[0122] S102. Then, the passivated metal plate is rinsed with water and then cleaned with deionized water to ensure that there is no chemical residue on the surface of the metal plate, thus obtaining a clean pretreated metal plate.

[0123] S11. The pre-treated metal plate is preheated to a final temperature of 85°C, the surface of the metal plate is dried and the surface activity of the metal plate is improved to obtain a metal plate to be coated with composite coating, and then the composite coating is bonded to it; then the composite coating is sprayed onto the upper surface of the metal plate to be coated with composite coating (i.e. the first side surface of the metal plate), that is, a polyurethane adhesive of brand name TS-8810 purchased from Yantai is sprayed, with a coating thickness of 0.14mm, to obtain the first pre-coated plate;

[0124] S2. The first pre-coated plate is heated to a final temperature of 150°C to make the composite coating TS-8810 evenly distributed on the surface of the metal plate and improve the bonding strength of the composite coating, so as to obtain a coated metal plate covered with a high-adhesion composite coating; wherein, the upper part of the composite coating 2 is used to bond with the polymer mixture.

[0125] S3. The polymer mixture is applied onto the composite coating 2 of the coated metal sheet by roller pressing 7 to obtain the second pre-coated sheet; wherein, the polymer mixture is prepared according to the following steps:

[0126] S30. The raw materials of the polymer material layer with the main material of polyvinyl chloride and the grade SG5 purchased from Keshun Waterproof Technology Co., Ltd. are premixed to obtain polyvinyl chloride polymer raw material mixture.

[0127] S31. Heat and mix the polyvinyl chloride polymer raw material mixture to obtain a polyvinyl chloride polymer mixture; then extrude the heated and mixed polyvinyl chloride polymer mixture and roll it onto the composite coating of the coated metal plate through roller 7, with a coating thickness of 1.3 mm, to obtain the second pre-coated plate.

[0128] S4. Cool the second pre-coated plate to a preset temperature of 80°C.

[0129] S5. At a preset temperature of 80°C, the functional coating, i.e. the anti-corrosion coating, is sprayed onto the side of the metal plate of the second pre-coated plate away from the composite coating 2. The functional coating forms a functional coating layer 4 to obtain a multi-layer composite waterproof metal plate. The multi-layer composite waterproof metal plate includes a functional coating layer 4, a metal plate 1, a composite coating 2, and a polymer material layer 3 stacked sequentially from bottom to top.

[0130] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A method for manufacturing a waterproof metal plate, characterized in that, include: A composite coating is applied to the surface of a metal plate to obtain a first pre-coated plate, wherein the coating thickness of the composite coating is 0.12 mm to 0.14 mm. The first pre-coated plate is subjected to heat treatment to make the composite coating evenly distributed on the surface of the metal plate, so as to obtain a coated metal plate covered with a high-adhesion composite coating. The final temperature of the heat treatment is 120℃-150℃. The polymer raw materials are premixed to obtain a polymer raw material mixture; the polymer raw material mixture is heated, mixed, and extruded to obtain a polymer mixture; the polymer mixture is coated onto the composite coating of the coated metal plate in a high-temperature semi-fluid state through a pressure roller to obtain a second pre-coated plate, wherein the thickness of the polymer mixture is 0.8mm-2.0mm. The second pre-coated plate is subjected to a cooling treatment to obtain a multi-layer composite waterproof metal plate, wherein the multi-layer composite waterproof metal plate includes stacked metal plates, a composite coating and a polymer material layer. The composite coating is selected from one or more of epoxy resin, polyurethane, acrylate, and chloroprene rubber adhesives; the polymer material layer is a composite layer composed of any one or more of polyethylene, polypropylene, polyvinyl chloride, chlorinated polyethylene, ethylene propylene diene monomer (EPDM) rubber, and ethylene-propylene copolymer.

2. The manufacturing method according to claim 1, characterized in that, include: The second pre-coated plate is subjected to a cooling treatment to reduce its temperature to a preset temperature. At a preset temperature, a functional coating is applied to the side of the metal plate of the second pre-coated plate away from the composite coating. The functional coating forms the functional coating layer to obtain a multi-layer composite waterproof metal plate. The multi-layer composite waterproof metal plate includes a functional coating layer, a metal plate, a composite coating, and a polymer material layer stacked together.

3. The manufacturing method according to claim 1, characterized in that, The metal plate is obtained according to the following steps: The metal plate is subjected to surface treatment to obtain a pretreated metal plate; The pretreated metal plate is preheated.

4. The manufacturing method according to claim 3, characterized in that, The surface treatment of the metal plate includes: Remove the dirt from the surface of the metal plate to obtain a clean metal plate; The cleaned metal plate is subjected to chemical or physical treatment to improve surface adhesion.

5. The manufacturing method according to claim 4, characterized in that, The chemical treatment of the cleaned metal plate includes: The cleaned metal plate is passivated using an acid or alkali to improve the surface adhesion of the metal plate; and / or The physical treatment of the cleaned metal plate includes: The cleaned metal plate is subjected to a sanding or plasma treatment to improve the surface adhesion of the metal plate.

6. The manufacturing method according to claim 1, characterized in that, The metal plate is selected from galvanized metal plate, aluminum plate, aluminum-magnesium-manganese plate, and stainless steel plate.

7. The manufacturing method according to claim 2, characterized in that, The functional coatings are selected from anti-corrosion coatings, thermal insulation materials, and vibration damping, sound insulation, and sound absorption materials.

8. A waterproof metal plate, characterized in that, It is prepared by the manufacturing method according to any one of claims 1-7.

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