Coated metal plate and preparation method therefor, and roof

Abstract

Provided in the present disclosure are a coated metal plate and a preparation method therefor, and a roof. The coated metal plate comprises a polymer layer, an adhesive layer and a metal layer, which are sequentially stacked, wherein on the basis of the total weight of the polymer layer, the polymer layer comprises a propenyl copolymer, a filler and an auxiliary agent, a propenyl component in the propenyl copolymer being not higher than 90%; the adhesive layer comprises a first adhesive layer in contact with the polymer layer, a second adhesive layer in contact with the metal layer, and a third adhesive layer located between the first adhesive layer and the second adhesive layer; and the adhesive layer comprises at least one of a polyolefin elastomer, a polyolefin plastomer and a polyolefin oligomer, and further comprises a maleic-anhydride-grafted polymer, a tackifying petroleum resin, a polystyrene thermoplastic elastomer and an auxiliary agent, the maleic-anhydride-grafted polymer comprising at least one of maleic-anhydride-grafted EVA, a maleic-anhydride-grafted polyolefin plastomer, a maleic-anhydride-grafted polyolefin elastomer, and a maleic-anhydride-grafted styrene-based thermoplastic elastomer.

Description

Coated metal sheet, preparation method and roof TECHNICAL FIELD

[0001] The present disclosure relates to the field of chemical materials, in particular to a coated metal sheet, a preparation method and a roof. BACKGROUND

[0002] Currently, light steel roofs are mostly supported by metal sheets, which are combined with vapor barriers, rock wool or extruded sheets, and waterproofing membranes to form a roof. In addition, the roof formed by construction also needs to meet the requirements of waterproofing, wind uplift resistance and service life. In order to ensure the performance of the roof, the roof needs to be formed by multiple film layers with the above functions and cannot be missing, and the construction also needs to be carried out in sequence, which is relatively high in cost. In addition, the roof with the above structure also has the defect of high maintenance cost. When maintaining, the damaged color steel sheet needs to be directly replaced, or the surface of the color steel sheet needs to be treated (such as rust removal, grinding, etc.), and the waterproofing membrane is used for maintenance.

[0003] Although there is currently a strategy of using a coated metal sheet to replace a multi-layer metal roof, the coated metal sheet is a composite sheet material, including a metal support structure and a high-molecular coated film with waterproofing function, so the adhesion between the metal and the high-molecular layer needs to meet the requirements of wind uplift resistance, durability and waterproofing of the roof.

[0004] Therefore, the current coated metal sheet, preparation method and roof still need to be improved. SUMMARY

[0005] The present disclosure aims to provide a coated metal sheet and a roof to solve or alleviate one or more technical problems in the related art.

[0006] As a first aspect of the embodiments of the present disclosure, the present disclosure provides a coated metal sheet. The coated metal sheet comprises a high-molecular layer, an adhesive layer and a metal layer which are sequentially stacked, the high-molecular layer comprises a propylene-based copolymer, a filler and an additive based on the total weight of the high-molecular layer, the propylene-based component in the propylene-based copolymer is not more than 90%, the adhesive layer comprises a first adhesive layer in contact with the high-molecular layer, a second adhesive layer in contact with the metal layer, and a third adhesive layer between the first and second adhesive layers, the adhesive layer comprises at least one of a polyolefin elastomer, a polyolefin plastomer and a polyolefin oligomer, and a maleic anhydride grafted polymer, an adhesion promoting petroleum resin, a polystyrene-based thermoplastic elastomer and an additive, the maleic anhydride grafted polymer comprises at least one of a maleic anhydride grafted EVA, a maleic anhydride grafted polyolefin plastomer, a maleic anhydride grafted polyolefin elastomer and a maleic anhydride grafted styrene-based thermoplastic elastomer.

[0007] The coated metal sheet has excellent waterproofing performance, reliable adhesion between the metal and non-metal layers, low cost, and simple construction.

[0008] According to an embodiment of the present application, the polymer layer comprises 50-85 parts by weight of the propylene-based copolymer, 10-60 parts by weight of the filler, 0.1-4 parts by weight of the auxiliary agent, the propylene-based copolymer comprises at least one of the polyolefin elastomer and the polypropylene.

[0009] According to an embodiment of the present application, the raw material for forming the polymer layer has a melt flow rate of no more than 10.0 g / 10 min measured at 230 °C under a load of 2.16 kg.

[0010] According to an embodiment of the present application, the polymer layer comprises a surface layer and a middle layer stacked in sequence, the middle layer is located close to the adhesive layer, the content of the titanium dioxide in the surface layer is greater than that in the middle layer, the content of the first filler in the surface layer is less than that of the second filler in the middle layer, and the ratio of the thickness of the surface layer to the thickness of the middle layer is (2-5):(6-9).

[0011] According to an embodiment of the present application, the surface layer comprises 50-85 parts by weight of the propylene-based copolymer, 5-15 parts by weight of the titanium dioxide, 5-45 parts by weight of the first filler, 0.1-2 parts by weight of the antioxidant, and 0.1-2 parts by weight of the ultraviolet-resistant auxiliary agent; the middle layer comprises 50-85 parts by weight of the propylene-based copolymer, 5-10 parts by weight of the titanium dioxide, 5-15 parts by weight of the second filler, 0.1-2 parts by weight of the antioxidant, and 0.1-2 parts by weight of the ultraviolet-resistant auxiliary agent.

[0012] According to an embodiment of the present application, the polymer layer satisfies at least one of the following conditions: the content of the polyolefin elastomer is greater than that of the polypropylene; the tensile breaking strength of the polyolefin elastomer is 12-16 MPa, and the elongation at break is 500-900%; the melt index of the polypropylene is 2-4 g / 10 min, and the flexural modulus is 800-1500 MPa; the first filler and the second filler each independently comprise at least one of calcium carbonate, talc, calcium hydroxide, and aluminum hydroxide; and the thickness of the polymer layer is 0.2-2 mm.

[0013] According to an embodiment of the present application, at least one of a glass fiber reinforced layer and a bottom layer is further included between the middle layer and the adhesive layer, the glass fiber reinforced layer is arranged close to the middle layer, and the bottom layer comprises 50-85 parts by weight of the propylene-based copolymer, 10-55 parts by weight of the third filler, 0.1-2 parts by weight of the antioxidant, and 0-1 parts by weight of the ultraviolet-resistant auxiliary agent.

[0014] According to an embodiment of the present application, based on the total weight of the adhesive layer, the adhesive layer comprises 20-60 parts by weight of the polyolefin elastomer, 10-30 parts by weight of the polyolefin plastomer, 2-8 parts by weight of the polyolefin oligomer, 15-100 parts by weight of the maleic anhydride grafted polymer, 2-8 parts by weight of the tackifying petroleum resin, 2-15 parts by weight of the polystyrene-based thermoplastic elastomer, and 0.2-2 parts by weight of the auxiliary.

[0015] According to an embodiment of the present application, the first adhesive layer comprises the polyolefin elastomer, the polyolefin plastomer, and the polyolefin oligomer; the second adhesive layer comprises at least one of the maleic anhydride grafted EVA, the maleic anhydride grafted polyolefin plastomer, the maleic anhydride grafted polyolefin elastomer, the maleic anhydride grafted polystyrene elastomer, and at least one selected from the tackifying petroleum resin, the polystyrene elastomer; and the third adhesive layer comprises the polyolefin elastomer, the polyolefin plastomer, and optionally the maleic anhydride grafted polymer.

[0016] According to an embodiment of the present application, based on the total weight of the first adhesive layer,

[0017] The first adhesive layer comprises 10-95 parts by weight of the polyolefin elastomer, 0-15 parts by weight of the polyolefin plastomer, and 0-10 parts by weight of the polyolefin oligomer.

[0018] Based on the total weight of the second adhesive layer, the second adhesive layer comprises 5-95 parts by weight of the maleic anhydride grafted EVA, 5-95 parts by weight of the maleic anhydride grafted polyolefin plastomer, 0-50 parts by weight of the maleic anhydride grafted polyolefin elastomer, 0-30 parts by weight of the maleic anhydride grafted polystyrene elastomer, 0-20 parts by weight of the tackifying petroleum resin, and 0-35 parts by weight of the polystyrene elastomer.

[0019] Based on the total weight of the third adhesive layer, the third adhesive layer comprises 10-75 parts by weight of the polyolefin elastomer, 10-75 parts by weight of the polyolefin plastomer, and 0-50 parts by weight of the maleic anhydride grafting.

[0020] According to an embodiment of the present application, the film-coated metal plate satisfies at least one of the following conditions: the thickness of the adhesive layer is not greater than the thickness of the polymer layer; the metal layer comprises at least one of a galvanized steel plate, an aluminum-zinc plated steel plate, an aluminum-magnesium-zinc plated steel plate, a stainless steel plate, and an aluminum alloy plate; and the thickness of the metal layer is 0.1-3 mm.

[0021] In another aspect of the present application, a method for preparing the coated metal sheet is provided. The method comprises: providing a polymer layer, an adhesive layer and a metal layer; feeding the polymer layer, the adhesive layer and the metal layer in a stacking order, and performing a hot pressing treatment to allow the polymer layer to be combined with the metal layer through the adhesive layer.

[0022] According to an embodiment of the present application, the polymer layer is a roll material, and the providing of the polymer layer comprises: providing a propylene-based copolymer, a filler and an additive, and performing a granulation by using a screw machine to form raw material particles; and performing an extrusion treatment on the raw material particles to obtain the roll material.

[0023] According to an embodiment of the present application, the polymer layer comprises a surface layer, a middle layer, a glass fiber reinforced layer and a bottom layer which are stacked in sequence, and the providing of the polymer layer comprises:

[0024] forming the surface layer and the middle layer by double-screw extrusion based on the formula of the surface layer and the middle layer;

[0025] performing a hot melt combination of the surface layer and the middle layer with the glass fiber reinforced layer to form a composite sheet, and the middle layer and the glass fiber reinforced layer are in contact;

[0026] forming the bottom layer by melt extrusion based on the formula of the bottom layer and combining the bottom layer with one side of the glass fiber reinforced layer of the composite sheet in a molten state to obtain the polymer layer.

[0027] In yet another aspect of the present application, a roof is provided. The roof comprises the coated metal sheet.

[0028] The coated metal sheet provided by the present disclosure realizes reliable bonding between metal and non-metal (polymer layer) by using an improved polymer layer and adhesive layer. The roof formed based on the coated metal sheet has good wind lift resistance and durability, and can meet the requirement of twenty years of service life of light steel roof.

[0029] The above summary is intended to illustrate the present application and is not intended to be limiting in any way. Further aspects, embodiments and features of the present disclosure will be readily apparent from the detailed description which follows. BRIEF DESCRIPTION OF DRAWINGS

[0030] FIG. 1 shows a structural schematic diagram of a coated metal sheet according to an embodiment of the present application;

[0031] FIG. 2 shows a structural schematic diagram of a polymer layer according to an embodiment of the present application;

[0032] Fig. 3 shows a schematic diagram of the structure of the adhesive layer according to one embodiment of the present application. DETAILED DESCRIPTION

[0033] In the following, only certain exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present disclosure, and different embodiments can be combined arbitrarily without conflict. Therefore, the following description is considered to be exemplary in nature rather than limiting.

[0034] In a first aspect of the present disclosure, the present disclosure proposes a coated metal sheet. Referring to Fig. 1, the coated metal sheet comprises a polymer layer 300, an adhesive layer 200 and a metal layer 100 which are sequentially stacked. The polymer layer 300 comprises a propylene-based copolymer, a filler and an additive based on the total weight of the polymer layer 300. Among them, the propylene-based component in the propylene-based copolymer is not higher than 90%. Referring to Fig. 3, the adhesive layer 200 comprises a first adhesive layer 230 in contact with the polymer layer, a second adhesive layer 210 in contact with the metal layer, and a third adhesive layer 220 between the first and second adhesive layers. The adhesive layer 200 comprises at least one of a polyolefin elastomer, a polyolefin plastomer and a polyolefin oligomer, and a maleic anhydride grafted polymer, a tackifying petroleum resin, a polystyrene-based thermoplastic elastomer and an additive, the maleic anhydride grafted polymer comprising at least one of a maleic anhydride grafted EVA, a maleic anhydride grafted polyolefin plastomer, a maleic anhydride grafted polyolefin elastomer and a maleic anhydride grafted styrene-based thermoplastic elastomer. The coated metal sheet has the advantages of excellent waterproof performance, reliable bonding of metal and non-metal layers, low cost and simple construction.

[0035] For the convenience of understanding, the principle of the coated metal sheet to achieve the above beneficial effects will be simply described first as follows:

[0036] As described before, the current coated metal sheet needs to be reliably bonded with metal and non-metal due to the metal supporting structure and the top waterproof polymer layer. The wind lifting resistance performance, waterproof performance and service life of the coated metal sheet with poor bonding performance will be greatly affected when used for roofing. The present application improves the polymer layer and the adhesive layer, adopts a three-layer adhesive layer structure, selects different components to form the sub-layer structure of the adhesive layer according to the surface characteristics of the metal layer 100 and the polymer layer 300, and sets an excessive third adhesive layer between them. At the same time, the composition and content of the propylene-based component in the polymer layer are adjusted to obtain a coated metal sheet with a peel strength ≥ 6 N / mm.

[0037] Specifically, according to the embodiments of the present application, the adhesive layer can contain polyolefin components similar to the components of the high molecular layer, and maleic anhydride grafted polymers for enhancing the bonding ability between the metal and the adhesive layer, while adding tackifying petroleum resins and other additives for tackifying, so as to achieve reliable bonding on both the metal and non-metal sides. More specifically, the polyolefin components can include polyolefin elastomers, polyolefin plastomers, and polyolefin oligomers. The above-mentioned polyolefin components and the high molecular layer which also contains olefin-based polymers (propylene-based copolymers) have good compatibility, thus the bonding force between the adhesive layer and the high molecular layer can be improved. The maleic anhydride grafted polymers are selected from at least one of maleic anhydride grafted EVA, maleic anhydride grafted polyolefin plastomer, maleic anhydride grafted polyolefin elastomer, and maleic anhydride grafted polystyrene elastomer, and preferably contain all of the above-mentioned maleic anhydride grafted polymers. The above-mentioned maleic anhydride grafted polymers can provide good adhesion of the adhesive layer on the metal surface, and the compatibility between the formed system and the above-mentioned polyolefin components is also good. Thus, the adhesive layer can achieve reliable bonding on both the metal and non-metal surfaces at the same time, and the bonding force between the multi-layer adhesive layers (the first to third adhesive layers) is also strong, and the adhesive layer itself is not easy to delaminate and cause peeling during use.

[0038] For example, according to one specific example of the present application, based on the total weight of the adhesive layer, the adhesive layer includes 20-60 parts by weight of polyolefin elastomer, 10-30 parts by weight of polyolefin plastomer, 2-8 parts by weight of polyolefin oligomer, 15-100 parts by weight of maleic anhydride grafted polymer, 2-8 parts by weight of tackifying petroleum resin, 2-15 parts by weight of polystyrene-based thermoplastic elastomer, and 0.2-2 parts by weight of additives.

[0039] According to the embodiments of the present application, the first adhesive layer includes the polyolefin elastomer, polyolefin plastomer, and polyolefin oligomer; the second adhesive layer includes at least one of the maleic anhydride grafted EVA, maleic anhydride grafted polyolefin plastomer, maleic anhydride grafted polyolefin elastomer, and maleic anhydride grafted polystyrene elastomer, and at least one selected from tackifying petroleum resin and polystyrene elastomer; and the third adhesive layer includes the polyolefin elastomer, polyolefin plastomer, and optionally maleic anhydride grafted polymer.

[0040] According to the embodiments of the present application, the specific types of additives in the adhesive layer are not particularly limited, and those skilled in the art can select them according to the use scenarios of the metal-coated sheet and the requirements. For example, the additives in the adhesive layer can include at least one of an antioxidant and an ultraviolet absorber, and those skilled in the art can select familiar compounds for addition.

[0041] According to an embodiment of the present application, the first adhesive layer comprises 10-95 parts by weight of the polyolefin elastomer, 0-15 parts by weight of the polyolefin plastomer, and 0-10 parts by weight of the polyolefin oligomer;

[0042] The second adhesive layer comprises 5-95 parts by weight of the maleic anhydride grafted EVA, 5-95 parts by weight of the maleic anhydride grafted polyolefin plastomer, 0-50 parts by weight of the maleic anhydride grafted polyolefin elastomer, 0-30 parts by weight of the maleic anhydride grafted polystyrene elastomer, 0-20 parts by weight of the tackifying petroleum resin, and 0-35 parts by weight of the polystyrene elastomer, based on the total weight of the second adhesive layer.

[0043] The third adhesive layer comprises 10-75 parts by weight of the polyolefin elastomer, 10-75 parts by weight of the polyolefin plastomer, and 0-50 parts by weight of the maleic anhydride grafting product, based on the total weight of the third adhesive layer.

[0044] In a specific embodiment, the raw materials of the high molecular layer can comprise (parts by weight):

[0045] 20-60 parts of the polyolefin elastomer;

[0046] 10-30 parts of the polyolefin plastomer;

[0047] 2-8 parts of the polyolefin oligomer;

[0048] 5-30 parts of the maleic anhydride grafted EVA;

[0049] 5-30 parts of the maleic anhydride grafted polyolefin plastomer;

[0050] 2-10 parts of the maleic anhydride grafted polyolefin elastomer;

[0051] 5-30 parts of the maleic anhydride grafted polystyrene thermoplastic elastomer;

[0052] 2-8 parts of the tackifying petroleum resin;

[0053] 2-15 parts of the polystyrene thermoplastic elastomer;

[0054] 0.1-1 part of the antioxidant;

[0055] 0.1-1 part of the ultraviolet absorber.

[0056] When the compositions of the first to third adhesive layers meet the above requirements, reliable adhesion can be formed between the three-layer adhesive films, and the adhesion between the first adhesive layer and the high molecular layer and between the third adhesive layer and the metal layer can also meet the requirements of the roofing on the metal sheet.

[0057] According to the embodiments of the present application, in order to improve the processing convenience of the polymer layer, the appearance performance of the polymer layer and the overall weather resistance under the premise of ensuring the bonding force, a propylene-based copolymer with a relatively large molecular weight is selected to form the polymer layer. For example, the raw material of the polymer layer formed can have a melt flow rate of no more than 10.0 g / 10 min measured at 230°C under a load of 2.16 kg. When the raw material of the polymer layer has the above flowability, the raw material is easy to process, and the raw material can be formed into a roll by melt extrusion, and then the raw material can be combined with the adhesive layer by hot melt bonding.

[0058] For example, according to a specific example, the polymer layer can include 50-85 parts by weight of a propylene-based copolymer, 10-60 parts by weight of a filler, and 0.1-4 parts by weight of an auxiliary. The propylene-based copolymer includes at least one of a polyolefin elastomer and polypropylene.

[0059] In the present application, the content of each type of propylene-based polymer in the propylene-based copolymer is not particularly limited. For example, the content of the polyolefin elastomer can be greater than the content of the polypropylene. By adjusting the chemical composition and specific content of the propylene-based copolymer in the polymer layer, the polymer layer as a whole can have good bonding performance and relatively ideal hot air welding performance. Thus, the roof prepared based on the coated metal sheet can be hot air welded through the polymer layer on the surface, thereby facilitating the assembly of the roof or the arrangement of the components of the roof. For example, according to a specific example of the present application, a polyolefin elastomer with a tensile strength at break of 12-16 MPa and an elongation at break of 500-900%, and a polypropylene with a melt index of 2-4 g / 10 min and a flexural modulus of 800-1500 MPa can be selected. In particular, the polyolefin elastomer and the polypropylene described above can be used to form the part of the polymer layer closest to the external environment.

[0060] In the present application, the specific type of the auxiliary is not particularly limited. For example, the auxiliary can include at least one of an antioxidant and an ultraviolet inhibitor. Similarly, the specific type of the filler is also not particularly limited. For example, the filler can include at least one of titanium white, calcium carbonate, talc, calcium hydroxide, and aluminum hydroxide. The thickness of the polymer layer is also not particularly limited. For example, the thickness of the polymer layer can be 0.2-2 mm.

[0061] According to embodiments of the present application, referring to FIG. 2, the polymer layer 300 includes a plurality of film layers stacked in sequence. For example, at least two of the top layer 340, the middle layer 330, the glass fiber reinforced layer 320, and the bottom layer 310 can be included. In some examples, the polymer layer can have all of the above film layers. The chemical composition of each film layer can be the same or different. For example, compared with the top layer 340, the middle layer 330 is located on the side close to the adhesive layer in the coated metal sheet. The content of titanium dioxide in the top layer is greater than the content of titanium dioxide in the middle layer. The higher content of titanium dioxide in the top layer is conducive to improving the appearance effect of the coated metal sheet, and the lower content of titanium dioxide in the middle layer is conducive to improving the composite strength between the middle layer and the glass fiber reinforced layer or the bottom layer. The chemical composition of the remaining fillers in the top layer and the chemical composition of the remaining fillers in the middle layer can be consistent or inconsistent. Taking the remaining fillers in the top layer as the first fillers and the remaining fillers in the middle layer as the second fillers as an example, the content of the first fillers in the top layer is less than the content of the second fillers in the middle layer, and the first and second fillers can each include at least one of calcium carbonate, talc, calcium hydroxide, and aluminum hydroxide. The thickness of the top layer and the thickness of the middle layer can also be inconsistent, specifically, the ratio of the thickness of the top layer to the thickness of the middle layer can be (2-5):(6-9).

[0062] According to embodiments of the present application, the top layer can include 50-85 parts by weight of the propylene-based copolymer, 5-15 parts by weight of titanium dioxide, 5-45 parts by weight of the first fillers, 0.1-2 parts by weight of the antioxidant, and 0.1-2 parts by weight of the ultraviolet resistance aid. The middle layer can include 50-85 parts by weight of the propylene-based copolymer, 5-10 parts by weight of titanium dioxide, 5-45 parts by weight of the second fillers, 0.1-2 parts by weight of the antioxidant, and 0.1-2 parts by weight of the ultraviolet resistance aid.

[0063] The glass fiber reinforced layer 320 can improve the thermal treatment dimensional change rate of the overall polymer layer, so as to reduce the risk of creep damage of the polymer layer and the metal layer in composite use due to the inconsistency of the linear expansion coefficients of the metal and the non-metal. Specifically, a glass fiber felt can be used as the glass fiber reinforced layer 320. In some examples, the thickness of the glass fiber reinforced layer 320 from the upper and lower surfaces (i.e., the top layer and the bottom layer) of the polymer layer is equal. The total thickness of the glass fiber reinforced layer 320 can be between 1.0-2.0 mm, and preferably the thickness is 1.5 mm-2.0 mm. The grammage of the glass fiber felt can be between 25-60 g / m2. In this way, a better reinforcing effect can be achieved while not significantly increasing the thickness and weight of the polymer layer.

[0064] According to embodiments of the present application, the bottom layer 310 can be in contact with the adhesive layer. Similarly, the filler other than titanium dioxide in the bottom layer 310 is a third filler, which can be selected from at least one of calcium carbonate, talc, calcium hydroxide, and aluminum hydroxide. The third filler can be consistent with the first and / or second filler, or can be inconsistent. The bottom layer 310 is in contact with the glass fiber reinforced layer on one side and the adhesive layer on the other side, and thus needs to have the ability to effectively bond the two film layers at the same time. In some specific examples, the bottom layer 310 can include 50-85 parts by weight of the propylene-based copolymer, 10-55 parts by weight of the third filler, 0.1-2 parts by weight of the antioxidant, and 0-1 part by weight of the ultraviolet resistance aid. Since the bottom layer is used to contact the adhesive layer, in order to improve the bonding strength of the bottom layer and the adhesive layer, and at the same time consider the production cost, the bottom layer can not contain titanium dioxide.

[0065] According to embodiments of the present application, the coated metal sheet satisfies at least one of the following conditions: the thickness of the adhesive layer is not greater than the thickness of the polymer layer. The metal layer includes at least one of a galvanized steel sheet, an aluminum-zinc plated steel sheet, an aluminum-magnesium-zinc plated steel sheet, a stainless steel sheet, and an aluminum alloy sheet. The thickness of the metal layer is 0.1-3 mm. Thus, the performance of the coated metal sheet can be further improved.

[0066] In another aspect of the present application, a method for preparing the coated metal sheet described above is provided. The method includes: providing a polymer layer, an adhesive layer, and a metal layer; feeding the polymer layer, the adhesive layer, and the metal layer in a stacking order, and performing a hot pressing process to allow the polymer layer to be combined on the metal layer through the adhesive layer. Thus, the coated metal sheet described above can be obtained more simply.

[0067] According to embodiments of the present application, the polymer layer is a roll material, and the providing of the polymer layer includes: providing a propylene-based copolymer, a filler, and an aid, and performing granulation by using a screw machine to form raw material particles; and performing extrusion processing on the raw material particles to obtain the roll material.

[0068] According to embodiments of the present application, the polymer layer includes a surface layer, a middle layer, a glass fiber reinforced layer, and a bottom layer stacked in sequence. The providing of the polymer layer includes: forming the surface layer and the middle layer by double-screw extrusion based on the formula of the surface layer and the middle layer; hot-melt combining the surface layer and the middle layer with the glass fiber reinforced layer to form a composite sheet, the middle layer being in contact with the glass fiber reinforced layer; and melt-extruding the bottom layer based on the formula of the bottom layer and combining the bottom layer with one side of the glass fiber reinforced layer of the composite sheet in a molten state to obtain the polymer layer.

[0069] The preparation method of the adhesive layer is not particularly limited, and in some examples, the adhesive layer can be produced by a flow casting, curtain coating, or blown film process.

[0070] In yet another aspect of the present application, a roof is provided. The roof comprises the coated metal sheet as described above. The roof has all the features and advantages of the coated metal sheet as described above, and will not be repeated here.

[0071] The methods used in the following examples are conventional methods unless otherwise specified, and the reagents used are commercially available reagents unless otherwise specified. Example 1

[0072] In this example, the adhesive layer is a three-layer structure with a thickness of 45 um. The specific information of each compound in the adhesive layer is as follows:

[0073] The first adhesive layer has a thickness of 5 um. The polyolefin elastomer is 80 parts, the polyolefin plastomer is 10 parts, and the polyolefin oligomer is 10 parts. The compound information of the formula is as follows:

[0074] The polyolefin elastomer selected is Dow Chemical 8200, with a tensile breaking strength of 5 MPa and an elongation at break of 1100%.

[0075] The polyolefin plastomer selected is ExxonMobil's Vistamaxx 3020FL, with a tensile breaking strength of 14 MPa and an elongation at break of 800%.

[0076] The polyolefin oligomer selected is ExxonMobil's 8880, with a viscosity of 1200 mPa·s.

[0077] The second adhesive layer has a thickness of 20 um. The compound information of the formula is as follows: 90 parts of maleic anhydride grafted EVA by weight, 60 parts of maleic anhydride grafted polyolefin plastomer by weight, 10 parts of maleic anhydride grafted polyolefin elastomer, 20 parts of maleic anhydride grafted polystyrene elastomer by weight, 10 parts of tackifying petroleum resin, and 20 parts of polystyrene elastomer.

[0078] The maleic anhydride grafted EVA selected is DuPont 30E783, with a melt index of 6 g / 10 min.

[0079] The maleic anhydride grafted polyolefin plastomer selected is DuPont Fusbond A series A560, with a density of 0.93 g / m3 and a melt index of 5.6 g / 10 min.

[0080] The maleic anhydride grafted polyolefin elastomer selected is DuPont Fusabond series N416, with a density of 0.869 g / m3 and a melt index of 23 g / 10 min.

[0081] The maleic anhydride grafted polystyrene elastomer selected is KRATON FG1901G, with a density of 0.91 g / m3 and a melt index of 20 g / 10 min.

[0082] The tackifying petroleum resin is selected from the copolymer petroleum resin of Ganga HM-1000R, and the softening point is 100 DEG C.

[0083] The polystyrene elastomer is selected from Yuehua YH-1105, and the melt index is 8 g / 10 min.

[0084] The third adhesive layer has a thickness of 10 um, and the polyolefin elastomer, the polyolefin plastomer and the maleic anhydride grafting compound are 40 parts, 40 parts and 20 parts respectively.

[0085] The polyolefin elastomer is selected from Dow Chemical 8200, and the tensile breaking strength is 5 MPa, and the elongation at break is 1100%.

[0086] The polyolefin plastomer is selected from Vistamaxx 3020FL of Exxon Mobil Company, and the tensile breaking strength is 14 MPa, and the elongation at break is 800%.

[0087] The maleic anhydride grafting compound is selected from DuPont 30E783, and the melt index is 6 g / 10 min.

[0088] The high molecular layer is a single-layer extrusion structure, and the thickness is 1.8 mm. The high molecular layer has the formula shown in Table 1, and the specific information of each compound in the high molecular layer is as follows:

[0089] The polyolefin elastomer is selected from Vistamaxx 3000 of Exxon Mobil Company, and the tensile breaking strength is 14 MPa, and the elongation at break is 800%.

[0090] The polypropylene is selected from T30S of Daqing Petrochemical Company, and the melt index is 3.5 g / 10 min, and the flexural modulus is 1500 MPa.

[0091] The calcium carbonate is selected from Omyacarb 2T of Omya Company.

[0092] The titanium white is selected from rutile titanium white R105 of Kobo Company.

[0093] The antioxidant is selected from Irganox 1010 of BASF Company.

[0094] The ultraviolet resistant additive is selected from RIASORBUV-770 of Rhodia.

[0095] The preparation process of the high molecular layer is as follows: the mixer is used to dry mix the mixture according to the formula in Table 1, and the mixture is heated and dried, and the drying temperature is 60 DEG C. After drying, the mixture is put into a single screw extruder, and is compounded with the adhesive film layer and the galvanized steel plate. Example 2

[0096] In this embodiment, the adhesive layer has a three-layer structure, and the thickness is 45 um. The formula of each compound in the adhesive layer is the same as that in Example 1.

[0097] The high molecular layer is a two-layer co-extrusion homogeneous TPO structure, and the overall thickness is 1.8 mm, and the thickness ratio of the surface layer and the middle layer is 3:7. The formula raw material manufacturers are basically the same as in Example 1, and the difference is that the raw material formula is shown in Table 1.

[0098] In this case, the preparation process of the high molecular layer is as follows:

[0099] The surface layer and the middle layer raw materials are respectively discharged into the double screw extruder according to the formula in Table 1, extruded from the same die after plasticizing by the double screw, and a double-layer co-extrusion homogeneous TPO coiled material is prepared after three-roller shaping. Example 3

[0100] In this example, the adhesive layer is a three-layer structure, and the thickness is 45 um. The formula raw material manufacturers of the compounds in the adhesive layer are the same as in Example 1.

[0101] The high molecular layer is a four-layer TPO-G (glass fiber reinforced) structure.

[0102] The formula raw material manufacturers are basically the same as in Example 1. The glass fiber layer is a glass fiber felt reinforced layer with a grammage of 45 g / m2, which is purchased from Changzhou Wujin Blue Sky Glass Fiber Material Factory. The formula of the surface layer and the middle layer is the same as that of Example 2, and the formula of the bottom layer is shown in Table 1.

[0103] In this case, the preparation process of the high molecular layer is as follows:

[0104] The surface layer and the middle layer raw materials are respectively discharged into the first double screw extruder and the second double screw extruder according to the formula in Table 1, and the formula mixture of the middle layer is combined with the glass fiber layer 3 in a molten state, and then the composite sheet is obtained after hot pressing and compounding by the lower roller, cooling and shaping by the middle roller. The formula mixture of the bottom layer is melted and extruded in the third double screw extruder, and is combined with the composite sheet (which has been heated by infrared) in a molten state by hot pressing and compounding by the upper roller, and then the glass fiber reinforced TPO sheet is obtained after cooling and shaping by the cooling roller. The total thickness is controlled to be 1.8 0.05 mm, and the layer thickness ratio of the surface layer, the middle layer and the bottom layer is 3:7:10 respectively. The screw temperatures of the first double screw extruder, the second double screw extruder and the third double screw extruder are 190°C respectively, and the die temperatures are 200°C respectively. The compounding temperature of the lower roller is 60°C, the compounding temperature of the middle roller is 40°C, the compounding temperature of the upper roller is 30°C, the infrared heating temperature is 180°C, and the cooling temperature of the cooling roller is 25°C.

[0105] Comparative Example 1

[0106] The other structures of this comparative example are basically the same as in Example 1, and the difference is that the raw material formula of the high molecular layer is shown in Table 1.

[0107] Comparative Example 2

[0108] The other structures of the present comparative example are basically the same as those of Example 1, except that the glass fiber reinforced layer is changed to a polyester warp knitted lining fabric, which is purchased from Zhejiang Hailide New Material Co., Ltd.

[0109]

[0110] “-” means none.

[0111] Performance test

[0112] The coated metal sheets prepared in the above examples and comparative examples were subjected to the following performance tests, and the specific results are shown in Table 2:

[0113]

[0114] By comparing the data of Example 1, Example 2 and Comparative Example 1, it can be seen that Example 1 and Example 2 have obvious advantages in seam peeling and peeling strength, which are better than Comparative Example 1. By comparing the data of Example 3 and Comparative Example 2, it can be seen that the example with glass fiber reinforced layer has obvious advantages in dimensional change rate and peeling strength.

[0115] The performance test method refers to GB27789-2011 “Thermoplastic polyolefin (TPO) waterproofing membrane”.

[0116] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or an ordered ranking of the indicated technical features. Thus, features defined with "first", "second" or "third" can include, explicitly or implicitly, one or more of such features. In the description of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0117] The above disclosure provides many different embodiments or examples for implementing different structures of the present disclosure. In order to simplify the present disclosure, the components and settings of specific examples are described above. Of course, they are only examples, and the purpose is not to limit the present disclosure. In addition, the present disclosure can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0118] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of various changes or replacements within the technical scope disclosed by the present disclosure, which should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A coated metal sheet, characterized in that, The polymer layer, the adhesive layer and the metal layer are stacked in sequence, The polymer layer comprises propylene-based copolymer, filler and auxiliary agent, the propylene-based copolymer has propylene-based component not more than 90% based on the total weight of the polymer layer; The adhesive layer comprises first adhesive layer in contact with the polymer layer, second adhesive layer in contact with the metal layer, and third adhesive layer between the first and second adhesive layers, the adhesive layer comprises at least one of polyolefin elastomer, polyolefin plastomer, polyolefin oligomer, and maleic anhydride grafted polymer, tackifying petroleum resin, polystyrene-based thermoplastic elastomer and auxiliary agent, The maleic anhydride grafted polymer comprises at least one of maleic anhydride grafted EVA, maleic anhydride grafted polyolefin plastomer, maleic anhydride grafted polyolefin elastomer, and maleic anhydride grafted polystyrene-based thermoplastic elastomer.

2. The plated metal sheet according to claim 1, characterized by The polymer layer comprises 50-85 parts by weight of the propylene-based copolymer, 10-60 parts by weight of the filler, and 0.1-4 parts by weight of the auxiliary agent, The propylene-based copolymer comprises at least one of polyolefin elastomer and polypropylene.

3. The plated metal sheet according to claim 2, characterized in that, The raw material for forming the polymer layer has melt flow rate not more than 10.0 g / 10 min measured at 230 °C and 2.16 kg.

4. The plated metal sheet according to claim 2, characterized by The polymer layer comprises surface layer and middle layer stacked in sequence, the middle layer is located close to the adhesive layer, The content of titanium white in the surface layer is greater than that in the middle layer, and the ratio of the thickness of the surface layer to the thickness of the middle layer is (2-5):(6-9).

5. The plated metal sheet according to claim 4, characterized in that The surface layer comprises 50-85 parts by weight of the propylene-based copolymer, 5-15 parts by weight of the titanium white, 5-45 parts by weight of the first filler, 0.1-2 parts by weight of the antioxidant, and 0.1-2 parts by weight of the ultraviolet-resistant auxiliary agent; The middle layer comprises 50-85 parts by weight of the propylene-based copolymer, 5-10 parts by weight of the titanium white, 5-45 parts by weight of the second filler, 0.1-2 parts by weight of the antioxidant, and 0.1-2 parts by weight of the ultraviolet-resistant auxiliary agent.

6. The plated metal sheet according to claim 5, characterized in that The polymer layer satisfies at least one of the following conditions: The content of the polyolefin elastomer is greater than that of the polypropylene; The tensile breaking strength of the polyolefin elastomer is 12-16 MPa, and the elongation at break is 500-900%; The melt index of the polypropylene is 2-4 g / 10 min, and the flexural modulus is 800-1500 MPa; The first filler and the second filler independently comprise at least one of calcium carbonate, talc, calcium hydroxide, and aluminum hydroxide; The thickness of the polymer layer is 0.2-2 mm.

7. The plated metal sheet according to claim 4, characterized in that The middle layer and the adhesive layer further comprise at least one of glass fiber reinforced layer and bottom layer, the glass fiber reinforced layer is located close to the middle layer, The bottom layer comprises 50-85 parts by weight of the propylene-based copolymer, 10-55 parts by weight of the third filler, 0.1-2 parts by weight of the antioxidant, and 0-1 parts by weight of the ultraviolet-resistant auxiliary agent.

8. The plated metal sheet according to claim 1, characterized in that The adhesive layer comprises 20-60 parts by weight of the polyolefin elastomer, 10-30 parts by weight of the polyolefin plastomer, 2-8 parts by weight of the polyolefin oligomer, 15-100 parts by weight of the maleic anhydride grafted polymer, 2-8 parts by weight of the tackifying petroleum resin, 2-15 parts by weight of the polystyrene-based thermoplastic elastomer, and 0.2-2 parts by weight of the auxiliary, based on the total weight of the adhesive layer.

9. The plated metal sheet according to claim 8, characterized in that, The first adhesive layer comprises the polyolefin elastomer, the polyolefin plastomer, and the polyolefin oligomer; The second adhesive layer comprises at least one of the maleic anhydride grafted EVA, the maleic anhydride grafted polyolefin plastomer, the maleic anhydride grafted polyolefin elastomer, and the maleic anhydride grafted polystyrene elastomer, and at least one selected from the tackifying petroleum resin and the polystyrene elastomer; The third adhesive layer comprises the polyolefin elastomer, the polyolefin plastomer, and optionally the maleic anhydride grafted polymer.

10. The coated metal sheet according to claim 8, wherein The first adhesive layer comprises 10-95 parts by weight of the polyolefin elastomer, 0-15 parts by weight of the polyolefin plastomer, and 0-10 parts by weight of the polyolefin oligomer, based on the total weight of the first adhesive layer. The second adhesive layer comprises 5-95 parts by weight of the maleic anhydride grafted EVA, 5-95 parts by weight of the maleic anhydride grafted polyolefin plastomer, 0-50 parts by weight of the maleic anhydride grafted polyolefin elastomer, 0-30 parts by weight of the maleic anhydride grafted polystyrene elastomer, 0-20 parts by weight of the tackifying petroleum resin, and 0-35 parts by weight of the polystyrene elastomer, based on the total weight of the second adhesive layer. The third adhesive layer comprises 10-75 parts by weight of the polyolefin elastomer, 10-75 parts by weight of the polyolefin plastomer, and 0-50 parts by weight of the maleic anhydride graft, based on the total weight of the third adhesive layer.

11. The plated metal sheet according to claim 1, characterized in that, At least one of the following conditions is satisfied: The thickness of the adhesive layer is not greater than the thickness of the polymer layer; The metal layer comprises at least one of a galvanized steel sheet, an aluminum-zinc plated steel sheet, an aluminum-magnesium-zinc plated steel sheet, a stainless steel sheet, and an aluminum alloy sheet; The thickness of the metal layer is 0.1-3 mm.

12. A method of producing the clad metal plate according to any one of claims 1 to 11, characterized by, The method comprises: providing a polymer layer, an adhesive layer, and a metal layer; feeding the polymer layer, the adhesive layer, and the metal layer in a stacking order, and performing a hot-pressing treatment to allow the polymer layer to be compounded on the metal layer through the adhesive layer.

13. The method of claim 12, wherein, The polymer layer is a roll material, and the providing of the polymer layer comprises: providing a propylene-based copolymer, a filler, and an auxiliary, and performing granulation by using a screw machine to form raw material particles; performing extrusion treatment on the raw material particles to obtain the roll material.

14. The method of claim 13, wherein, The polymer layer comprises a surface layer, a middle layer, a glass fiber reinforced layer, and a bottom layer stacked in sequence, and the providing of the polymer layer comprises: forming the surface layer and the middle layer by twin-screw extrusion based on the formulation of the surface layer and the middle layer; performing hot-melt compounding of the surface layer and the middle layer with the glass fiber reinforced layer to form a composite sheet, and the middle layer and the glass fiber reinforced layer are in contact; The bottom layer is formed by melt extrusion based on a formulation of the bottom layer and is compounded with one side of the glass fiber reinforced layer of the composite sheet in a molten state to obtain the polymer layer.

15. A roof characterized in that The coated metal sheet according to any one of claims 1 to 11.

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