Coated metal plate, preparation method and roof

Abstract

The present application provides a coated metal plate, a preparation method and a roof. The coated metal plate comprises: a waterproof layer; an adhesion layer, located on one side of the waterproof layer; and a metal layer, located on the side of the adhesion layer away from the waterproof layer. The waterproof layer comprises polyvinyl chloride. The adhesion layer comprises a first adhesive layer in contact with the waterproof layer, a third adhesive layer in contact with the metal layer, and a second adhesive layer located between the first adhesive layer and the third adhesive layer; and the adhesion layer comprises a PES copolyester, an ethylene-ester copolymer, a maleic anhydride-modified polymer and a thermoplastic elastomer. The coated metal plate has at least one of the advantages of being environmentally friendly, achieving strong adhesion force between the waterproof layer and the metal layer, etc.

Description

Coated metal panels, preparation methods and roofing Technical Field

[0001] This application relates to the field of chemical materials, and in particular to coated metal sheets, preparation methods, and roofing. Background Technology

[0002] PVC waterproof membranes are widely used in industrial and commercial roof waterproofing systems due to their soft texture and excellent weldability. Traditionally, mechanical fastening and full-adhesion methods are used to bond PVC waterproof membranes to metal roofs; however, these methods suffer from high costs, complex construction, solvent evaporation, and difficulty in controlling the amount of adhesive applied.

[0003] Furthermore, composite boards using PVC to form the waterproof layer generally have weak adhesion between the waterproof layer and the supporting metal layer due to the plasticizers in PVC. Therefore, although there are currently coated metal sheets that use solvent-based adhesives to bond PVC and metal sheets, in order to ensure the bonding strength, a large amount of solvent needs to be used or discharged during the adhesive production and bonding process, which is not environmentally friendly.

[0004] Therefore, current coated metal panels, preparation methods, and roofing still need improvement. Summary of the Invention

[0005] This application aims to provide a coated metal panel, a preparation method, and a roofing structure to solve or alleviate one or more technical problems in the related art.

[0006] As a first aspect of this application, this application provides a coated metal sheet. The coated metal sheet includes: a waterproof layer; an adhesive layer located on one side of the waterproof layer; and a metal layer located on the side of the adhesive layer away from the waterproof layer. The waterproof layer comprises polyvinyl chloride (PVC), and the adhesive layer includes a first adhesive layer in contact with the waterproof layer, a third adhesive layer in contact with the metal layer, and a second adhesive layer located between the first and third adhesive layers. The adhesive layer comprises PES copolyester, ethylene-ester copolymer, maleic anhydride modified polymer, or thermoplastic elastomer.

[0007] According to embodiments of this application, in the adhesive layer: the ethylene-ester copolymer includes at least one selected from ethylene-acrylate copolymers, ethylene-vinyl acetate copolymers, and glycidyl methacrylate-modified ethylene-acrylate copolymers; the maleic anhydride-modified polymer includes at least one selected from maleic anhydride-grafted ethylene-vinyl acetate, maleic anhydride-grafted ethylene-acrylate, maleic anhydride-grafted polyolefin plasmon, maleic anhydride-grafted polyolefin elastomer, and maleic anhydride-modified ethylene-acrylate copolymer; the thermoplastic elastomer includes polystyrene elastomers.

[0008] According to embodiments of this application, the PES copolyester is a copolyester of a dicarboxylic acid and a diol, wherein the dicarboxylic acid includes terephthalic acid, isophthalic acid, adipic acid, and sebacic acid; and the diol includes 1,4-butanediol, 1,6-hexanediol, hydroxyl-terminated polybutadiene, and polyethylene glycol.

[0009] According to an embodiment of this application, based on the total weight of the adhesive layer, the adhesive layer comprises:

[0010] 20-40 parts by weight of PES copolyester, 1-20 parts by weight of ethylene-vinyl acetate copolymer, 2-55 parts by weight of maleic anhydride-grafted ethylene-vinyl acetate, 2-30 parts by weight of ethylene-acrylate copolymer, 2-30 parts by weight of maleic anhydride-grafted ethylene-acrylate copolymer, 0-30 parts by weight of glycidyl methacrylate-modified ethylene-acrylate copolymer, 2-30 parts by weight of maleic anhydride-grafted polyolefin plastomer, 0-20 parts by weight of maleic anhydride-grafted polyolefin elastomer, 0-10 parts by weight of maleic anhydride-grafted polystyrene elastomer, 0-10 parts by weight of polystyrene elastomer, and 0.05-1 parts by weight of antioxidant.

[0011] According to embodiments of this application, the first adhesive layer comprises one or more of the aforementioned PES copolyesters; the second adhesive layer comprises at least one of ethylene-vinyl acetate, maleic anhydride-grafted ethylene-vinyl acetate, ethylene-acrylate copolymers, maleic anhydride-grafted ethylene-acrylate copolymers, and glycidyl methacrylate-modified ethylene-acrylate copolymers; the third adhesive layer comprises at least one of maleic anhydride-grafted polyethylene-vinyl acetate copolymers, maleic anhydride-grafted polyolefin plastomers, maleic anhydride-grafted polyolefin elastomers, maleic anhydride-grafted polystyrene elastomers, and polystyrene elastomers.

[0012] According to embodiments of this application, the number-average molecular weight of the PES copolyester is greater than 40,000;

[0013] The ethylene-acrylate copolymer includes at least one of ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, and ethylene-butyl acrylate copolymer;

[0014] The maleic anhydride-modified ethylene-acrylate copolymer includes at least one of the following: maleic anhydride-grafted ethylene-methyl acrylate copolymer, maleic anhydride-grafted ethylene-ethyl acrylate copolymer, maleic anhydride-grafted ethylene-butyl acrylate copolymer, maleic anhydride-ethylene-methyl acrylate terpolymer, maleic anhydride-ethylene-ethyl acrylate terpolymer, and maleic anhydride-ethylene-butyl acrylate terpolymer.

[0015] The glycidyl methacrylate-modified ethylene-acrylate copolymer includes at least one of the following: glycidyl methacrylate-grafted ethylene-methyl acrylate copolymer, glycidyl methacrylate-grafted ethylene-ethyl acrylate copolymer, glycidyl methacrylate-grafted ethylene-butyl acrylate copolymer, glycidyl methacrylate-ethylene-methyl acrylate terpolymer, glycidyl methacrylate-ethylene-ethyl acrylate terpolymer, and glycidyl methacrylate-ethylene-butyl acrylate terpolymer.

[0016] The maleic anhydride-grafted polyolefin plastic body includes maleic anhydride-grafted LLDPE.

[0017] The polystyrene elastomer includes at least one of SIS, SBS, SEBS, and SIPS.

[0018] According to an embodiment of this application, based on the total weight of the first adhesive layer, the first adhesive layer may include 95-99.9 parts by weight of PES copolyester and 0.1-5 parts by weight of antioxidant.

[0019] Based on the total weight of the second adhesive layer, the second adhesive layer may include 5-95 parts by weight of maleic anhydride-grafted polyethylene-vinyl acetate copolymer, preferably 20-80 parts by weight; 5-95 parts by weight of maleic anhydride-grafted polyolefin plasmon, preferably 20-60 parts by weight; 0-50 parts by weight of maleic anhydride-grafted polyolefin elastomer, preferably 0-20 parts by weight; 0-30 parts by weight of maleic anhydride-grafted polystyrene elastomer, preferably 0-10 parts by weight; 0-35 parts by weight of polystyrene elastomer, preferably 5-25 parts by weight; and 0.05-1 part by weight of antioxidant, preferably 0.1-0.5 parts by weight.

[0020] Based on the total weight of the third adhesive layer, the third adhesive layer comprises 5-95 parts by weight of maleic anhydride-grafted polyethylene-vinyl acetate copolymer, preferably 20-80 parts by weight; 5-95 parts by weight of maleic anhydride-grafted polyolefin plasmon, preferably 20-60 parts by weight; 0-50 parts by weight of maleic anhydride-grafted polyolefin elastomer, preferably 0-20 parts by weight; 0-30 parts by weight of maleic anhydride-grafted polystyrene elastomer, preferably 0-10 parts by weight; 0-35 parts by weight of polystyrene elastomer, preferably 5-25 parts by weight; and 0.05-1 parts by weight of antioxidant, preferably 0.1-0.5 parts by weight.

[0021] According to an embodiment of this application, the waterproof layer is a glass fiber reinforced polyvinyl chloride layer.

[0022] According to embodiments of this application, at least one of the following conditions is met: the thickness of the waterproof layer is 1.2 to 2.0 mm; the thickness of the adhesive layer is 0.02 to 0.15 mm, preferably 0.04 to 0.08 mm; and the thickness of the metal layer is 0.3 to 2.0 mm, preferably 0.5 to 1.2 mm.

[0023] In another aspect of this application, a method for preparing a coated metal plate as described in any of the preceding claims is proposed. The method includes: providing a waterproof layer and depositing an adhesive layer on one side of the waterproof layer; and fixing the waterproof layer with the adhesive layer onto the metal layer by hot pressing.

[0024] According to an embodiment of this application, the hot pressing treatment is performed at a temperature of 150-200 degrees Celsius and a pressure of 0.4-0.8 MPa.

[0025] In another aspect of this application, a roof is proposed. This roof comprises the aforementioned coated metal panel.

[0026] The coated metal sheet proposed in this application uses PVC material as the surface layer material and an improved adhesive layer, which greatly reduces the impact of plasticizer migration in traditional PVC rolls on the peel strength of the coated metal sheet. The waterproof layer can be laminated to the upper and lower surfaces of the metal sheet by hot pressing. Therefore, this coated metal sheet has no solvent emissions during production and use, making it safe and environmentally friendly.

[0027] The above overview is for illustrative purposes only and is not intended to be limiting in any way. Further aspects, embodiments, and features of this application will become readily apparent from the following detailed description, in addition to the illustrative aspects, embodiments, and features described above. Attached Figure Description

[0028] Figure 1 shows a schematic diagram of the structure of a metal-coated plate according to an embodiment of the present application. Detailed Implementation

[0029] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this application, and different embodiments can be combined arbitrarily without conflict. Therefore, the following description is to be considered exemplary in nature and not restrictive.

[0030] In a first aspect, this application provides a coated metal sheet. Referring to FIG1, the coated metal has a waterproof layer 200, an adhesive layer, and a metal layer 100. The adhesive layer includes a first adhesive layer 310 in contact with the waterproof layer 200, a third adhesive layer 330 in contact with the metal layer 100, and a second adhesive layer 320 located between the first and third adhesive layers. The adhesive layer includes PES copolyester, ethylene-ester copolymer, maleic anhydride modified polymer, and thermoplastic elastomer. This coated metal sheet has at least one of the advantages of being environmentally friendly and having strong adhesion between the waterproof layer and the metal layer.

[0031] To facilitate understanding, the principle behind the coated metal sheet proposed in this application achieving the aforementioned beneficial effects will be briefly explained below:

[0032] As mentioned earlier, plasticizers in the waterproofing layer formed by PVC materials migrate to the surface of the material during use. This migration alters the interface between the waterproofing layer and the adhesive layer, reducing the viscosity between them and consequently weakening the bond between the PVC layer and the adhesive layer or the metal layer. Since PVC rolls are a relatively mature, industrially mass-producible material, improving the PVC layer to address this issue is costly. While this situation has a smaller impact on panels with shorter service life requirements, coated metal sheets, especially roofing coated metal sheets, typically require a service life of 10-20 years. Conventional PVC rolls experience significant plasticizer migration over this 10-20 year period, and the extent of this migration significantly affects adhesion.

[0033] This application achieves better overall bonding strength by adjusting the adhesive layer materials and structure, resulting in a coated metal panel that meets the service life requirements of roofing. Furthermore, the coated metal panel proposed in this application can be formed by hot pressing, which is environmentally friendly, requires no large amounts of solvents, simplifies the manufacturing process and reduces costs, and allows for easier and faster formation of coated metal panels. Specifically, the adhesive layer materials in this application take into account the surface properties of both the PVC layer and the metal layer, and adopt a three-layer structure. The materials of different adhesive layers are adjusted according to the specific conditions of the bonding interface. The first and second adhesive layers proposed in this application have good bonding effects on PVC and metal, while the second adhesive layer serves as a transition, improving the overall cohesive strength of the adhesive layer and preventing delamination.

[0034] Specifically, the adhesive layer of this application is composed of PES copolyester, ethylene copolymers, maleic anhydride-modified polymers such as maleic anhydride-grafted polyolefin elastomers, maleic anhydride-grafted polyolefin plastomers, maleic anhydride-grafted ethylene vinyl acetate, maleic anhydride-grafted polystyrene elastomers, and thermoplastic elastomers such as polystyrene elastomers. This adhesive layer exhibits high bonding strength to PVC and high peel strength to metal sheets, and also possesses strong cohesive strength, thus ensuring stable adhesion between the waterproof layer and the metal layer. Furthermore, the coated metal sheet is equipped with an anti-corrosion undercoat, further enhancing the overall service life of the coated metal sheet.

[0035] According to embodiments of this application, the PES copolyester in the adhesive layer is a copolyester of a diacid and a diol. The specific composition of the PES copolyester is not particularly limited, and those skilled in the art can adjust it according to the material of the PVC layer and other polymer materials in the adhesive layer. In some examples, the diacid in the PES copolyester may include at least one selected from terephthalic acid and isophthalic acid, adipic acid and sebacic acid, and the diol may include at least one selected from 1,4-butanediol and 1,6-hexanediol, hydroxyl-terminated polybutadiene and polyethylene glycol.

[0036] According to embodiments of this application, the ethylene copolymer in the adhesive layer is not particularly limited and can be selected and adjusted according to the specific material of the PVC layer. For example, in some examples, the ethylene copolymer may include at least one selected from ethylene-acrylate copolymers, ethylene-vinyl acetate copolymers, and glycidyl methacrylate-modified ethylene-acrylate copolymers. The maleic anhydride-modified polymer may be adjusted according to the specific composition of the ethylene copolymer and the PVC layer, for example, it may include maleic anhydride-grafted polymers and maleic anhydride-modified copolymers. The maleic anhydride-grafted polymer may be selected from at least one selected from maleic anhydride-grafted ethylene-vinyl acetate, maleic anhydride-grafted polyolefin plastomers, and maleic anhydride-grafted polyolefin elastomers, and the maleic anhydride-modified copolymer may include maleic anhydride-modified ethylene-acrylate copolymers.

[0037] According to embodiments of this application, the adhesive layer may further include an antioxidant. The specific type of antioxidant is not particularly limited, and those skilled in the art can select familiar compounds as antioxidants according to actual needs.

[0038] In a specific example, based on the total weight of the adhesive layer, the adhesive layer comprises: 20-40 parts by weight of PES copolyester, 1-20 parts by weight of ethylene vinyl acetate copolymer, 2-55 parts by weight of maleic anhydride-grafted ethylene vinyl acetate, 2-30 parts by weight of ethylene-acrylate copolymer, 2-30 parts by weight of maleic anhydride-grafted ethylene-acrylate copolymer, 0-30 parts by weight of glycidyl methacrylate-modified ethylene-acrylate copolymer, 2-30 parts by weight of maleic anhydride-grafted polyolefin plastomer, 0-20 parts by weight of maleic anhydride-grafted polyolefin elastomer, 0-10 parts by weight of maleic anhydride-grafted polystyrene elastomer, 0-10 parts by weight of polystyrene elastomer, and 0.05-1 part by weight of antioxidant.

[0039] For example, the adhesive layer may include 20-40 parts by weight of PES copolyester, 1-20 parts by weight of ethylene vinyl acetate copolymer, 2-55 parts by weight of maleic anhydride-grafted ethylene vinyl acetate, 2-30 parts by weight of ethylene-acrylate copolymer, 2-30 parts by weight of maleic anhydride-grafted ethylene-acrylate copolymer, 0-30 parts by weight of glycidyl methacrylate-modified ethylene-acrylate copolymer, 2-30 parts by weight of maleic anhydride-grafted polyolefin plastomer, 0-20 parts by weight of maleic anhydride-grafted polyolefin elastomer, 0-10 parts by weight of maleic anhydride-grafted polystyrene elastomer, 0-10 parts by weight of polystyrene elastomer, and 0.05-1 parts by weight of antioxidant.

[0040] As mentioned earlier, to further improve the adhesion of the adhesive layer to PVC materials and metals, and to resist the migration of plasticizer components at the interface between the waterproof layer and the adhesive layer over time, the adhesive layer comprises a first adhesive layer, a second adhesive layer, and a third adhesive layer stacked sequentially. The first adhesive layer is in contact with the waterproof layer, and the third adhesive layer is in contact with the metal layer. The compositions of the first, second, and third adhesive layers are all different. Therefore, adhesive surfaces with different properties can be formed according to different interfaces, which is beneficial for further improving the adhesion between the adhesive layer and PVC and metals. The second adhesive layer can serve as a transition layer, improving the overall cohesive strength of the adhesive layer and preventing peeling within the adhesive layer.

[0041] Specifically, the first adhesive layer comprises one or more PES copolyesters. That is, the first adhesive layer may include one or more copolyesters composed of the aforementioned diacid and diol. In some examples, the first adhesive layer may also include an antioxidant. For example, based on the total weight of the first adhesive layer, it may include 95-99.9 parts by weight of PES copolyester and 0.1-5 parts by weight of antioxidant. Preferably, it includes 0.1-0.5 parts by weight of antioxidant. The first adhesive layer, primarily formed from PES copolyester, improves adhesion to PVC and prevents a significant decrease in interfacial bonding strength after plasticizer migration to the interface.

[0042] In this application, the specific molecular weight of the PES copolyester is not particularly limited. For example, the molecular weight of the PES copolyester is greater than 40,000. Specifically, this molecular weight is a number-average molecular weight, and the molecular weight can be 50,000 to 70,000. More specifically, it can be 55,000 to 68,000. The first adhesive layer formed by the PES copolyester with the above molecular weight has a better internal structure, stronger adhesion to PVC, and can better mitigate the decrease in interfacial bonding caused by plasticizer migration.

[0043] The second adhesive layer comprises at least one of ethylene vinyl acetate, maleic anhydride-grafted ethylene vinyl acetate, ethylene-acrylate copolymer, maleic anhydride-grafted ethylene-acrylate copolymer, and glycidyl methacrylate-modified ethylene-acrylate copolymer. In some examples, the second adhesive layer may also include an antioxidant. For example, in some examples, based on the total weight of the second adhesive layer, the second adhesive layer may comprise 5-95 parts by weight of maleic anhydride-grafted polyethylene-vinyl acetate copolymer, preferably 20-80 parts by weight; 5-95 parts by weight of maleic anhydride-grafted polyolefin plastomer, preferably 20-60 parts by weight; 0-50 parts by weight of maleic anhydride-grafted polyolefin elastomer, preferably 0-20 parts by weight; 0-30 parts by weight of maleic anhydride-grafted polystyrene elastomer, preferably 0-10 parts by weight; 0-35 parts by weight of polystyrene elastomer, preferably 5-25 parts by weight; and 0.05-1 part by weight of antioxidant, preferably 0.1-0.5 parts by weight. The grafting rate of the maleic anhydride-grafted polyethylene-vinyl acetate copolymer is preferably 0.5-2%; the grafting rate of the maleic anhydride-grafted polyolefin plastic body is preferably 0.5-2%; and the grafting rate of the maleic anhydride-grafted polyolefin elastomer is preferably 0.5-2%. Preferably, the maleic anhydride-grafted polyolefin plastic body includes maleic anhydride-grafted LLDPE. The second adhesive layer and the first and third adhesive layers of the above components all have good compatibility and can improve the overall cohesive strength of the adhesive layer.

[0044] The third adhesive layer comprises at least one of maleic anhydride-grafted polyethylene-vinyl acetate copolymer, maleic anhydride-grafted polyolefin plastomer, maleic anhydride-grafted polyolefin elastomer, maleic anhydride-grafted polystyrene elastomer, and polystyrene elastomer. In some examples, based on the total weight of the third adhesive layer, the third adhesive layer comprises 5-95 parts by weight of maleic anhydride-grafted polyethylene-vinyl acetate copolymer, preferably 20-80 parts by weight; 5-95 parts by weight of maleic anhydride-grafted polyolefin plastomer, preferably 20-60 parts by weight; 0-50 parts by weight of maleic anhydride-grafted polyolefin elastomer, preferably 0-20 parts by weight; 0-30 parts by weight of maleic anhydride-grafted polystyrene elastomer, preferably 0-10 parts by weight; 0-35 parts by weight of polystyrene elastomer, preferably 5-25 parts by weight; and 0.05-1 parts by weight of antioxidant, preferably 0.1-0.5 parts by weight. The grafting rate of maleic anhydride-grafted polyethylene-vinyl acetate copolymer is preferably 0.5-2%, the grafting rate of maleic anhydride-grafted polyolefin plastide is preferably 0.5-2%, and the grafting rate of maleic anhydride-grafted polyolefin elastomer is preferably 0.5-2%. The polystyrene elastomers are SIS, SBS, SEBS, and SIPS.

[0045] According to embodiments of this application, the waterproof layer can be a fiberglass-reinforced polyvinyl chloride (PVC) layer. For example, the waterproof layer may contain a fiberglass reinforcement layer. Specifically, the waterproof layer can be formed by a central fiberglass reinforcement structure and PVC material covering the upper and lower surfaces of the fiberglass reinforcement structure. Specifically, the fiberglass reinforcement structure is a layered structure formed by materials with fiberglass reinforcement, such as fiberglass cloth. This improves the strength and aging resistance of the waterproof layer itself, and also helps to block the migration path of plasticizers within the waterproof layer, thereby slowing down plasticizer migration.

[0046] According to embodiments of this application, the thickness of each layer in the coated metal sheet is not particularly limited, and those skilled in the art can design it as needed. In some specific examples, the thickness of the waterproof layer can be 1.2–2.0 mm. The thickness of the adhesive layer is 0.2–0.15 mm, preferably 0.04–0.08 mm. The thickness of the metal layer is 0.3–2.0 mm, preferably 0.5–1.2 mm.

[0047] In another aspect of this application, a method for preparing the coated metal sheet described in any of the preceding claims is proposed. The method includes: providing a waterproof layer and depositing an adhesive layer on one side of the waterproof layer; and fixing the waterproof layer with the adhesive layer onto the metal layer by hot pressing. This method can easily obtain the aforementioned coated metal sheet.

[0048] According to embodiments of this application, the conditions for hot-pressing to bond the waterproof layer and the metal layer are not particularly limited, and those skilled in the art can adjust them according to the specific composition of each layer's materials. In a specific example, the hot-pressing temperature is 150-200 degrees Celsius, and the pressure is 0.4-0.8 MPa.

[0049] For example, a waterproof layer can be provided first. This waterproof layer can be a commercially available PVC roll or a PVC roll formed using a melt co-extrusion process.

[0050] The adhesive layer can be formed via a co-extrusion process. When the adhesive layer is formed from a first, second, and third adhesive layer, the method may include: granulating the raw materials for each film layer separately using an extruder, and then passing the resulting granules through a three-layer co-extrusion blown film mechanism to obtain a three-layer composite adhesive layer. The adhesive layer and PVC roll material can be first laminated by hot pressing to obtain a waterproof layer with the adhesive layer.

[0051] In some specific examples, the method may include:

[0052] The first adhesive layer material is added to a twin-screw extruder for granulation at an extrusion temperature of 130-180℃, preferably 140-170℃, to obtain the first adhesive layer granules.

[0053] The second adhesive layer material is added to a twin-screw extruder for granulation at an extrusion temperature of 140-180℃, preferably 150-170℃, to obtain the second adhesive layer granules.

[0054] The third adhesive layer material is added to a twin-screw extruder for granulation at an extrusion temperature of 150-200℃, preferably 170-190℃, to obtain the third adhesive layer granules.

[0055] The first, second, and third adhesive layer granules obtained by twin-screw extrusion granulation are passed through a three-layer co-extrusion composite blown film mill to obtain a three-layer composite adhesive layer. The co-extrusion die temperature is 130-190℃, preferably 150-180℃.

[0056] Subsequently, the adhesive layer and PVC roll are subjected to hot pressing. Alternatively, the aforementioned hot pressing process can be used, such as at 150-200 degrees Celsius and a pressure of 0.4-0.8 MPa, to bond the prepared adhesive layer, waterproof roll, and metal layer through a single hot pressing.

[0057] In another aspect of this application, a roof is proposed. This roof comprises the aforementioned film-coated metal panel. This roof possesses all the features and advantages of the aforementioned film-coated metal panel, which will not be repeated here.

[0058] Unless otherwise specified, the methods used in the following examples are conventional methods, and the reagents used are commercially available reagents. Example 1

[0059] The adhesive layer materials are as follows (all materials are in parts by weight):

[0060] First adhesive layer: PES copolyester, number average molecular weight 65,000; granulation extrusion temperature 150℃.

[0061] Third adhesive layer: 55 parts maleic anhydride-grafted EVA, 25 parts maleic anhydride-grafted polyolefin plasmon, and 20 parts polystyrene elastomer; granulation extrusion temperature 180℃.

[0062] Second adhesive layer: 70 parts of ethylene-methyl acrylate copolymer and 30 parts of ethylene-vinyl acetate copolymer, granulation extrusion temperature 160℃.

[0063] A PVC fiberglass reinforcement layer (0.8mm thick) and a 0.6mm thick galvanized metal sheet are selected, with 50g galvanized coating on both sides as the waterproof layer and the metal layer. The coated metal sheet is formed by hot pressing at 180℃, 0.6MPa pressure, and 20s. Example 2

[0064] The remaining parameters are the same as in Example 1, except that:

[0065] The adhesive layer materials are as follows (all materials are in parts by weight):

[0066] First adhesive layer: PES copolyester, number average molecular weight 38,000;

[0067] Third adhesive layer: 55 parts maleic anhydride-grafted EVA, 25 parts maleic anhydride-grafted polyolefin plasmon, and 20 parts polystyrene elastomer.

[0068] Second adhesive layer: 70 parts of ethylene-methyl acrylate copolymer and 30 parts of ethylene-vinyl acetate copolymer. Example 3

[0069] The remaining parameters are the same as in Example 1, except that:

[0070] The adhesive layer materials are as follows (all materials are in parts by weight):

[0071] First adhesive layer: PES copolyester, number average molecular weight 65,000;

[0072] Third adhesive layer: 55 parts maleic anhydride-grafted EVA, 25 parts maleic anhydride-grafted polyolefin plasmon, and 20 parts polystyrene elastomer.

[0073] Second adhesive layer: 40 parts of ethylene-methyl acrylate copolymer and 60 parts of ethylene-vinyl acetate copolymer. Example 4

[0074] The remaining parameters are the same as in Example 1, except that:

[0075] The adhesive layer materials are as follows (all materials are in parts by weight):

[0076] First adhesive layer: PES copolyester, number average molecular weight 65,000;

[0077] Third adhesive layer: 85 parts maleic anhydride-grafted EVA, 5 parts maleic anhydride-grafted polyolefin plasmon, and 10 parts polystyrene elastomer.

[0078] Second adhesive layer: 70 parts of ethylene-methyl acrylate copolymer and 30 parts of ethylene-vinyl acetate copolymer. Example 5

[0079] The remaining parameters are the same as in Example 1, except that:

[0080] The adhesive layer materials are as follows (all materials are in parts by weight):

[0081] First adhesive layer: PES copolyester, number average molecular weight 65,000;

[0082] Third adhesive layer: 55 parts maleic anhydride-grafted EVA, 25 parts maleic anhydride-grafted polyolefin plasmon, and 20 parts polystyrene elastomer.

[0083] Second adhesive layer: 70 parts of ethylene-ethyl acrylate copolymer and 30 parts of ethylene-vinyl acetate copolymer. Example 6

[0084] The remaining parameters are the same as in Example 1, except that:

[0085] The adhesive layer materials are as follows (all materials are in parts by weight):

[0086] First adhesive layer: PES copolyester, number average molecular weight 65,000;

[0087] Third adhesive layer: 55 parts maleic anhydride-grafted EVA, 25 parts maleic anhydride-grafted polyolefin plasmon, and 20 parts polystyrene elastomer.

[0088] Second adhesive layer: 70 parts of ethylene-butyl acrylate copolymer and 30 parts of ethylene-vinyl acetate copolymer. Comparative Example 1

[0089] The remaining parameters are the same as in Example 1, except that the polyPES copolyester is replaced with TPU. Comparative Example 2

[0090] The remaining parameters are the same as in Example 1, except that all maleic anhydride-grafted EVA is replaced with maleic anhydride-grafted SEBS. Comparative Example 3

[0091] The remaining parameters are the same as in Example 1, except that:

[0092] The raw materials for the third adhesive layer are: 55 parts maleic anhydride-grafted EVA, 20 parts maleic anhydride-grafted polyolefin plasmon, and 25 parts tackifying petroleum resin.

[0093] The coated metal sheets obtained in the above embodiments and comparative examples were tested to determine their peel strength. The test results are shown in Table 1 below:

[0094] Table 1 Performance test results of coated metal sheets

[0095] As shown in Table 1 above, Examples 1-6 all have significantly higher peel strength than the comparative examples, with Example 1 having the strongest peel strength.

[0096] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0097] The foregoing application provides many different implementations or examples for carrying out different structures of this application. To simplify this application, the components and arrangements of specific examples are described above. Of course, these are merely examples and are not intended to limit this application. Furthermore, reference numerals and / or reference letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0098] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A coated metal plate, characterized in that, include: Waterproof layer; An adhesive layer, wherein the adhesive layer is located on one side of the waterproof layer; A metal layer, the metal layer being located on the side of the adhesive layer away from the waterproof layer; The waterproof layer comprises polyvinyl chloride, the adhesive layer comprises a first adhesive layer in contact with the waterproof layer, a third adhesive layer in contact with the metal layer, and a second adhesive layer located between the first and third adhesive layers, and the adhesive layer comprises PES copolyester, ethylene-ester copolymer, maleic anhydride modified polymer, and thermoplastic elastomer.

2. The coated metal plate according to claim 1, characterized in that, In the adhesive layer: The ethylene-ester copolymers include at least one selected from ethylene-acrylate copolymers, ethylene-vinyl acetate copolymers, and glycidyl methacrylate-modified ethylene-acrylate copolymers; The maleic anhydride-modified polymer includes at least one of maleic anhydride-grafted ethylene-vinyl acetate, maleic anhydride-grafted ethylene-acrylate, maleic anhydride-grafted polyolefin plasmon, maleic anhydride-grafted polyolefin elastomer, and maleic anhydride-modified ethylene-acrylate copolymer. The thermoplastic elastomer includes polystyrene-based elastomers.

3. The coated metal plate according to claim 2, characterized in that, The PES copolyester is a copolyester of a dicarboxylic acid and a diol. The dicarboxylic acid includes at least one of terephthalic acid, isophthalic acid, adipic acid, and sebacic acid; The diol includes at least one of 1,4-butanediol, 1,6-hexanediol, hydroxyl-terminated polybutadiene, and polyethylene glycol.

4. The coated metal plate according to claim 2 or 3, characterized in that, Based on the total weight of the adhesive layer, the adhesive layer comprises: 20-40 parts by weight of PES copolyester, 1-20 parts by weight of ethylene-vinyl acetate copolymer, 2-55 parts by weight of maleic anhydride-grafted ethylene-vinyl acetate, 2-30 parts by weight of ethylene-acrylate copolymer, 2-30 parts by weight of maleic anhydride-grafted ethylene-acrylate copolymer, 0-30 parts by weight of glycidyl methacrylate-modified ethylene-acrylate copolymer, 2-30 parts by weight of maleic anhydride-grafted polyolefin plastomer, 0-20 parts by weight of maleic anhydride-grafted polyolefin elastomer, 0-10 parts by weight of maleic anhydride-grafted polystyrene elastomer, 0-10 parts by weight of polystyrene elastomer, and 0.05-1 parts by weight of antioxidant.

5. The coated metal plate according to claim 4, characterized in that, The first adhesive layer comprises one or more of the aforementioned PES copolyesters; The second adhesive layer comprises at least one of ethylene-vinyl acetate, maleic anhydride-grafted ethylene-vinyl acetate, ethylene-acrylate copolymer, maleic anhydride-grafted ethylene-acrylate copolymer, and glycidyl methacrylate-modified ethylene-acrylate copolymer. The third adhesive layer comprises at least one of maleic anhydride-grafted polyethylene-vinyl acetate copolymer, maleic anhydride-grafted polyolefin plasmon, maleic anhydride-grafted polyolefin elastomer, maleic anhydride-grafted polystyrene elastomer, and polystyrene elastomer.

6. The coated metal plate according to claim 5, characterized in that, The number-average molecular weight of the PES copolyester is greater than 40,000; The ethylene-acrylate copolymer includes at least one of ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, and ethylene-butyl acrylate copolymer; The maleic anhydride-modified ethylene-acrylate copolymer includes at least one of the following: maleic anhydride-grafted ethylene-methyl acrylate copolymer, maleic anhydride-grafted ethylene-ethyl acrylate copolymer, maleic anhydride-grafted ethylene-butyl acrylate copolymer, maleic anhydride-ethylene-methyl acrylate terpolymer, maleic anhydride-ethylene-ethyl acrylate terpolymer, and maleic anhydride-ethylene-butyl acrylate terpolymer. The glycidyl methacrylate-modified ethylene-acrylate copolymer includes at least one of the following: glycidyl methacrylate-grafted ethylene-methyl acrylate copolymer, glycidyl methacrylate-grafted ethylene-ethyl acrylate copolymer, glycidyl methacrylate-grafted ethylene-butyl acrylate copolymer, glycidyl methacrylate-ethylene-methyl acrylate terpolymer, glycidyl methacrylate-ethylene-ethyl acrylate terpolymer, and glycidyl methacrylate-ethylene-butyl acrylate terpolymer. The maleic anhydride-grafted polyolefin plastic body includes at least one of maleic anhydride-grafted LLDPE, maleic anhydride-grafted LDPE, and maleic anhydride-grafted HDPE. The polystyrene elastomer includes at least one of SIS, SBS, SEBS, and SIPS.

7. The coated metal plate according to claim 5 or 6, characterized in that, Based on the total weight of the first adhesive layer, the first adhesive layer may include 95-99.9 parts by weight of PES copolyester and 0.1-5 parts by weight of antioxidant; Based on the total weight of the second adhesive layer, the second adhesive layer may include 5-95 parts by weight of maleic anhydride-grafted polyethylene-vinyl acetate copolymer, preferably 20-80 parts by weight; 5-95 parts by weight of maleic anhydride-grafted polyolefin plasmon, preferably 20-60 parts by weight; 0-50 parts by weight of maleic anhydride-grafted polyolefin elastomer, preferably 0-20 parts by weight; 0-30 parts by weight of maleic anhydride-grafted polystyrene elastomer, preferably 0-10 parts by weight; 0-35 parts by weight of polystyrene elastomer, preferably 5-25 parts by weight; and 0.05-1 part by weight of antioxidant, preferably 0.1-0.5 parts by weight. Based on the total weight of the third adhesive layer, the third adhesive layer comprises 5-95 parts by weight of maleic anhydride-grafted polyethylene-vinyl acetate copolymer, preferably 20-80 parts by weight; 5-95 parts by weight of maleic anhydride-grafted polyolefin plasmon, preferably 20-60 parts by weight; 0-50 parts by weight of maleic anhydride-grafted polyolefin elastomer, preferably 0-20 parts by weight; 0-30 parts by weight of maleic anhydride-grafted polystyrene elastomer, preferably 0-10 parts by weight; and 0-35 parts by weight of polystyrene elastomer, preferably 5-25 parts by weight. 0.05-1 parts by weight of antioxidant, preferably 0.1-0.5 parts by weight.

8. The coated metal plate according to claim 1, characterized in that, The waterproof layer is a fiberglass reinforced polyvinyl chloride layer.

9. The coated metal plate according to claim 1, characterized in that, At least one of the following conditions must be met: The thickness of the waterproof layer is 1.2–2.0 mm; The thickness of the adhesive layer is 0.2–0.15 mm, preferably 0.04–0.08 mm; The thickness of the metal layer is 0.3 to 2.0 mm, preferably 0.5 to 1.2 mm.

10. A method for preparing a coated metal plate according to any one of claims 1-9, characterized in that, include: A waterproof layer is provided, and an adhesive layer is provided on one side of the waterproof layer; The waterproof layer with an adhesive layer is fixed to the metal layer by hot pressing.

11. The method according to claim 10, characterized in that, The hot pressing process is carried out at a temperature of 150-200 degrees Celsius and a pressure of 0.4-0.8 MPa.

12. A roof, characterized in that, Includes the coated metal sheet as described in any one of claims 1-9.

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