Anti-corrosion base film, and preparation method therefor and use thereof

Abstract

Disclosed in the present invention are an anti-corrosion base film, and a preparation method therefor and the use thereof. The anti-corrosion base film sequentially comprises a low-friction layer, a transition layer and a bonding layer, wherein the bonding layer is used for bonding to a metal plate; the low-friction layer comprises an elastomer, a plastomer and silicone master batches; and the low-friction layer is used for reducing the friction coefficient of the anti-corrosion base film and improving the anti-corrosion performance of the anti-corrosion base film. The anti-corrosion base film of the present invention has a low friction coefficient, avoids damage when applied to the tile pressing of metal-coated plates, and can also further enhance the anti-corrosion effect. The production process is simple, one-step forming being achieved without the need for using any oil-based and water-based adhesive; and the production is finished entirely using polymer materials. The anti-corrosion base film has the characteristics of resistance to tile press wear, a strong bonding force to a metal plate, excellent corrosion resistance, etc.

Description

A corrosion-resistant base film, its preparation method and application Technical Field

[0001] This invention belongs to the technical field of anti-corrosion base film and metal coated plate, specifically relating to a low-friction anti-corrosion base film, a method for preparing the anti-corrosion base film, and the application of the anti-corrosion base film in metal coated plates. Background Technology

[0002] Metal-clad laminate is a composite material made of polymer and metal sheets, suitable for construction, transportation, and industrial fields, featuring corrosion resistance, lightweight, and durability. In particular, its corrosion resistance and ease of processing make it an ideal material for roofing industrial and commercial buildings.

[0003] Currently, the lower surface of metal clad sheets is generally protected against corrosion by coating or conventional anti-corrosion base film. However, when metal clad sheets with coating or conventional anti-corrosion base film are formed by roll forming, the coating or anti-corrosion base film is easily damaged by the mechanical parts of the roll forming machine. Damaged parts of the coating or anti-corrosion base film will further reduce the anti-corrosion performance.

[0004] For example, patent application CN118269440A relates to a thermoplastic polyolefin elastomer PVC-U roofing sheet and its preparation method, using modified polyvinyl chloride film or modified polyolefin film as the anti-corrosion base film. However, both of these anti-corrosion base films are still prone to damage during the PVC-U roofing sheet forming process, and the damaged parts of the base film are prone to corrosion during the use of the PVC-U roofing sheet.

[0005] For example, patent CN115570864B involves a multifunctional coated plate and its preparation method, in which graphene oxide and silicon micropowder are added to the anti-corrosion base film. Graphene oxide and silicon micropowder have very limited effect on reducing the friction coefficient of the anti-corrosion base film, and the anti-corrosion base film in this patent is also prone to damage during the coating plate forming process.

[0006] The above background information is provided only to assist in understanding the inventive concept and technical solution of this invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above information was disclosed before the filing date of this patent application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Summary of the Invention

[0007] In view of this, in order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide an improved anti-corrosion base film having a low-friction layer, which can further synergistically enhance the anti-corrosion and adhesion effects.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] An anti-corrosion base film comprises, in sequence, a low-friction layer, a transition layer, and an adhesive layer, wherein the adhesive layer is used to bond with a metal plate; the low-friction layer comprises an elastomer, a plastic body, and a silicone masterbatch; the low-friction layer is used to reduce the coefficient of friction of the anti-corrosion base film and to improve the anti-corrosion performance of the anti-corrosion base film.

[0010] According to some preferred embodiments of the present invention, the low-friction layer comprises, by weight, the following raw material components:

[0011] 5-95 parts of elastomer

[0012] 5-95 parts of plastisol

[0013] 5-40 parts of silicone masterbatch.

[0014] Preferably, the mass ratio of the plastic body to the elastomer is 2:1 to 3:1, and the mass ratio of the plastic body to the silicone masterbatch is 4:1 to 5:1.

[0015] According to some preferred embodiments of the present invention, the low-friction layer comprises, by weight, the following raw material components:

[0016] 10-40 parts of elastomer

[0017] 20-80 parts of plastic body

[0018] 10-25 parts of silicone masterbatch.

[0019] According to some preferred embodiments of the invention, the elastomer is a polyolefin elastomer, such as a propylene-based elastomer, preferably a polypropylene elastomer.

[0020] According to some preferred embodiments of the invention, the plastic body is a polyolefin plastic body, such as polypropylene and / or HDPE (high-density polyethylene).

[0021] According to some preferred embodiments of the present invention, the carrier of the silicone masterbatch is one or more selected from high-density polyethylene, polystyrene such as SEBS, low-density polyethylene and propylene-based elastomers.

[0022] According to some preferred embodiments of the present invention, the adhesive layer comprises maleic anhydride-grafted EVA, maleic anhydride-grafted polyolefin plastomer, maleic anhydride-grafted polyolefin elastomer, maleic anhydride-grafted polystyrene elastomer, and tackifying petroleum resin and polystyrene elastomer. The maleic anhydride graft primarily provides adhesion to the metal plate, while the tackifying petroleum resin and polystyrene elastomer primarily regulate the interfacial wetting properties during hot-pressing of the anti-corrosion base film with the metal plate.

[0023] According to some preferred embodiments of the present invention, the adhesive layer comprises the following raw material components in parts by weight:

[0024] 5-95 parts of maleic anhydride-grafted EVA

[0025] 5-95 parts of maleic anhydride-grafted polyolefin plastic body

[0026] 5-50 parts of maleic anhydride-grafted polyolefin elastomer

[0027] 5-30 parts of maleic anhydride-grafted polystyrene elastomer

[0028] 5-20 parts of tackifying petroleum resin

[0029] 5-35 parts of polystyrene elastomer.

[0030] Preferably, the adhesive layer comprises the following raw material components in parts by weight:

[0031] Maleic anhydride-grafted EVA 20-80 parts

[0032] 20-60 parts of maleic anhydride-grafted polyolefin plastic body

[0033] 5-20 parts of maleic anhydride-grafted polyolefin elastomer

[0034] 5-10 parts of maleic anhydride-grafted polystyrene elastomer

[0035] 5-10 parts of tackifying petroleum resin

[0036] 5 to 25 parts of polystyrene elastomer.

[0037] According to some preferred embodiments of the present invention, the content of VA (vinyl acetate) in the maleic anhydride-grafted EVA (ethylene-vinyl acetate copolymer) is not higher than 28%, which is beneficial to improving the adhesion of the anti-corrosion base film to the metal plate and the forming of the base film; the maleic anhydride-grafted polyolefin plastic body is maleic anhydride-grafted linear low-density polyethylene (LLDPE); the maleic anhydride-grafted polyolefin elastomer is maleic anhydride-grafted POE; the maleic anhydride-grafted polystyrene elastomer is maleic anhydride-grafted SEBS (hydrogenated styrene-butadiene block copolymer) or maleic anhydride-grafted HIPS (high-impact polystyrene); the tackifying petroleum resin is hydrogenated petroleum resin; the polystyrene elastomer is SIS (styrene-isoprene-styrene block copolymer), SBS (styrene-butadiene-styrene block copolymer), SEBS (linear triblock copolymer with polystyrene as the end block and ethylene-butene copolymer obtained by hydrogenation of polybutadiene as the middle elastic block), or HIPS (high-impact polystyrene).

[0038] According to some preferred embodiments of the present invention, the transition layer comprises a polyolefin elastomer, a polyolefin plastomer, and a maleic anhydride graft, wherein the maleic anhydride graft is optional.

[0039] According to some preferred embodiments of the present invention, the transition layer comprises, by weight, the following raw material components:

[0040] 10-75 parts of polyolefin elastomer

[0041] 10-75 parts of polyolefin plastide

[0042] 0-50 parts of maleic anhydride graft.

[0043] Preferably, the transition layer comprises the following raw material components in parts by weight:

[0044] 20-60 parts of polyolefin elastomer

[0045] 20-60 parts of polyolefin plastide

[0046] 10-30 parts of maleic anhydride graft.

[0047] According to some preferred embodiments of the present invention, the polyolefin elastomer is one or more selected from polypropylene elastomer and polyethylene elastomer; the polyolefin plastomer is one or more selected from polypropylene plastomer and polyethylene plastomer; the maleic anhydride graft is one or more selected from maleic anhydride-grafted polyethylene, polypropylene, POE (random copolymer elastomer of ethylene and high carbon α-olefins such as 1-butene, 1-hexene, 1-octene, etc., polymerized in situ using metallocene catalysts), EVA (ethylene-vinyl acetate copolymer), SIS (styrene-isoprene-styrene block copolymer), SEBS (linear triblock copolymer with polystyrene as the end block and ethylene-butene copolymer obtained by hydrogenation of polybutadiene as the middle elastic block).

[0048] According to some preferred embodiments of the present invention, the low-friction layer further includes an additive, which includes an antioxidant and / or an ultraviolet absorber; the antioxidant is one or more selected from antioxidant 1010, antioxidant 1076, antioxidant 168, and antioxidant 264; the ultraviolet absorber is one or more selected from UV327, UV531, UV770, and UV944.

[0049] According to some preferred embodiments of the present invention, the thickness of the anti-corrosion base film is 30-200 μm, preferably 40-120 μm, and most preferably 60-100 μm. The coefficient of friction on the low-friction layer side of the anti-corrosion base film is 0.19-0.35.

[0050] The polysiloxane in the silicone masterbatch of the low-friction layer is a hybrid material composed of an inorganic siloxane main chain with suspended organic side chains, and the nano-silica in the silicone masterbatch is also an inorganic component. The synergistic effect between the inorganic and organic components in the low-friction layer increases the anti-corrosion effect of the substrate. Furthermore, through the selection of materials for the low-friction layer, transition layer, and adhesive layer, such as the maleic anhydride-grafted EVA in the transition layer having better compatibility with the main resin in the low-friction layer and adhesive layer, the cohesive strength of the anti-corrosion substrate is higher, further improving salt spray resistance.

[0051] The present invention also provides a method for preparing the anti-corrosion base film as described above, comprising the following steps:

[0052] The raw materials for the low-friction layer, the transition layer, and the bonding layer are extruded and granulated respectively.

[0053] The extruded granulated particles are used to prepare a three-layer composite film using a blown film machine, which is the anti-corrosion base film.

[0054] In some embodiments, the method for preparing the anti-corrosion base film includes the following steps:

[0055] The raw material with the low friction layer is added to a twin-screw extruder for granulation, and the extrusion temperature is 140-200℃;

[0056] The raw material for the transition layer film is added to a twin-screw extruder for granulation preparation, with an extrusion temperature of 150-200℃.

[0057] The raw material for the metal bonding layer is added to a twin-screw extruder for granulation preparation, with an extrusion temperature of 130-190℃.

[0058] The granules prepared by twin-screw extruder are used to prepare a three-layer composite hot melt adhesive film through a three-layer blown film machine, which is the anti-corrosion base film. The co-extrusion die temperature is 140-190℃.

[0059] The present invention also provides an application of the anti-corrosion base film as described above in metal clad panels, that is, a metal clad panel prepared with the anti-corrosion base film as described above, and further, the anti-corrosion base film or the metal clad panel can be prepared as a building roof.

[0060] Preferably, the metal-coated panel comprises, in sequence, an anti-corrosion base film, a metal plate, a hot-melt adhesive film, and a waterproof membrane. The metal plate is an aluminized zinc-coated steel plate. This metal-coated panel can subsequently be used to form a building roof using sheet metallization. The metal-coated panel exhibits salt spray resistance of at least 1600 hours, or even 4000 hours, without showing any red rust.

[0061] Compared with existing traditional technologies, the advantages of this invention are: the anti-corrosion base film of this invention has a low coefficient of friction, avoiding damage when applied to metal coated sheet pressing, and can further improve the anti-corrosion effect; the production process is simple, it is formed in one step, and does not require the use of oil-based and water-based adhesives, and is produced entirely from polymer materials; it has the characteristics of being resistant to wear of the pressing machine, having strong adhesion to metal plates, and excellent corrosion resistance. Attached Figure Description

[0062] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0063] Figure 1 is a schematic diagram of the cross-sectional structure of the anti-corrosion base film in a preferred embodiment of the present invention;

[0064] Figure 2 is a schematic diagram of the cross-sectional structure of the metal-coated plate in a preferred embodiment of the present invention. Detailed Implementation

[0065] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0066] The raw materials used in the following examples are from the following sources:

[0067]

[0068] As shown in Figure 1, the three-layer anti-corrosion base film of this embodiment includes a low-friction layer exposed on the lowest surface, an adhesive layer bonded to the metal plate, and a transition layer connecting the low-friction layer and the adhesive layer.

[0069] The low-friction layer is composed of elastomer-based wear-resistant agents, plastisol-based wear-resistant agents, silicone masterbatch, and additives. The amount of each component in the low-friction layer can be determined according to the needs of the tile type. The mass ratio of plastisol to elastomer is 2:1 to 3:1, and the mass ratio of plastisol to silicone masterbatch is 4:1 to 5:1.

[0070] By weight, the low-friction layer comprises the following raw material components:

[0071] 5-95 parts of elastomer

[0072] 5-95 parts of plastisol

[0073] 5-40 parts of silicone masterbatch.

[0074] Preferably, the low-friction layer comprises the following raw material components in parts by weight:

[0075] 10-40 parts of elastomer

[0076] 20-80 parts of plastic body

[0077] 10-25 parts of silicone masterbatch.

[0078] The elastomer is a polyolefin elastomer, such as a propylene-based elastomer, preferably a polypropylene elastomer; the plasmid is a polyolefin plasmid, such as polypropylene and / or HDPE (high-density polyethylene); the silicone masterbatch is a silicone masterbatch formed using high-density polyethylene, polystyrene, low-density polyethylene or a propylene-based elastomer as a carrier.

[0079] The adjuvants include antioxidants and / or ultraviolet absorbers; the antioxidants are selected from one or more of antioxidant 1010, antioxidant 1076, antioxidant 168, and antioxidant 264; the ultraviolet absorbers are selected from one or more of UV327, UV531, UV770, and UV944.

[0080] The adhesive layer comprises maleic anhydride-grafted EVA, maleic anhydride-grafted polyolefin plasmon, maleic anhydride-grafted polyolefin elastomer, maleic anhydride-grafted polystyrene elastomer, tackifying petroleum resin, and polystyrene elastomer. The maleic anhydride graft primarily provides adhesion to the metal sheet, while the tackifying petroleum resin and polystyrene elastomer mainly regulate the interfacial wetting properties during hot-pressing of the anti-corrosion substrate with the metal sheet.

[0081] By weight, the adhesive layer comprises the following raw material components:

[0082] 5-95 parts of maleic anhydride-grafted EVA

[0083] 5-95 parts of maleic anhydride-grafted polyolefin plastic body

[0084] 5-50 parts of maleic anhydride-grafted polyolefin elastomer

[0085] 5-30 parts of maleic anhydride-grafted polystyrene elastomer

[0086] 5-20 parts of tackifying petroleum resin

[0087] 5-35 parts of polystyrene elastomer.

[0088] Preferably, the adhesive layer comprises the following raw material components in parts by weight:

[0089] Maleic anhydride-grafted EVA 20-80 parts

[0090] 20-60 parts of maleic anhydride-grafted polyolefin plastic body

[0091] 5-20 parts of maleic anhydride-grafted polyolefin elastomer

[0092] 5-10 parts of maleic anhydride-grafted polystyrene elastomer

[0093] 5-10 parts of tackifying petroleum resin

[0094] 5 to 25 parts of polystyrene elastomer.

[0095] Among them, the content of VA (vinyl acetate) in maleic anhydride-grafted EVA (ethylene-vinyl acetate copolymer) is not higher than 28%, which is beneficial to improving the adhesion of the anti-corrosion base film to the metal plate and the formation of the base film; the maleic anhydride-grafted polyolefin plastic body is maleic anhydride-grafted linear low-density polyethylene; the maleic anhydride-grafted polyolefin elastomer is maleic anhydride-grafted POE; the maleic anhydride-grafted polystyrene elastomer is maleic anhydride-grafted SEBS (hydrogenated styrene-butadiene block copolymer) or maleic anhydride-grafted HIPS (high-impact polystyrene); the tackifying petroleum resin is hydrogenated petroleum resin; the polystyrene elastomer is SIS (styrene-isoprene-styrene block copolymer), SBS (styrene-butadiene-styrene block copolymer), SEBS (linear triblock copolymer with polystyrene as the end block and ethylene-butene copolymer obtained by hydrogenation of polybutadiene as the middle elastic block) or HIPS (high-impact polystyrene).

[0096] The transition layer includes polyolefin elastomers and polyolefin plastisols, with selective addition of maleic anhydride grafts. Its main function is to firmly bond the low-friction layer and the metal bonding layer together during the molding of the anti-corrosion base film, and to provide the overall cohesive strength of the low-friction film.

[0097] By weight, the transition layer comprises the following raw material components:

[0098] 10-75 parts of polyolefin elastomer

[0099] 10-75 parts of polyolefin plastide

[0100] 0-50 parts of maleic anhydride graft.

[0101] Preferably, the transition layer comprises the following raw material components in parts by weight:

[0102] 20-60 parts of polyolefin elastomer

[0103] 20-60 parts of polyolefin plastide

[0104] 10-30 parts of maleic anhydride graft.

[0105] Among them, the polyolefin elastomer is selected from one or more of polypropylene elastomer and polyethylene elastomer; the polyolefin plastomer is selected from one or more of polypropylene plastomer and polyethylene plastomer; the maleic anhydride graft is selected from one or more of maleic anhydride-grafted polyethylene, polypropylene, POE (random copolymer elastomer that achieves in-situ polymerization of ethylene with high carbon α-olefins such as 1-butene, 1-hexene, 1-octene, etc. using metallocene catalysts), EVA (ethylene-vinyl acetate copolymer), SIS (styrene-isoprene-styrene block copolymer), SEBS (linear triblock copolymer with polystyrene as the end block and ethylene-butene copolymer obtained by hydrogenation of polybutadiene as the middle elastic block).

[0106] The anti-corrosion base film can be produced through casting, coating, or blown film processes. When using the blown film process, the specific preparation process is as follows:

[0107] The raw material for the outer film is added to a twin-screw extruder for granulation at an extrusion temperature of 140-200℃.

[0108] The raw material for the transition layer film is added to a twin-screw extruder for granulation preparation, with an extrusion temperature of 150-200℃.

[0109] The raw material for the inner layer film is added to a twin-screw extruder for granulation preparation, with an extrusion temperature of 130-190℃;

[0110] The granules prepared by twin-screw extruder are used to prepare a three-layer composite film by a three-layer blown film machine, with the co-extrusion die temperature being 140-190℃.

[0111] The thickness of the anti-corrosion base film is 30-200 μm, preferably 40-120 μm, and most preferably 60-100 μm. The coefficient of friction on the low-friction layer side of the anti-corrosion base film is 0.19-0.35. When this anti-corrosion base film is applied to metal coated plates, its salt spray resistance performance is at least 1600 hours without the appearance of red rust. Example 1

[0112] The anti-corrosion base film in this embodiment includes a low-friction layer exposed on the lowest surface, an adhesive layer bonded to the metal plate, and a transition layer connecting the low-friction layer and the adhesive layer.

[0113] The low-friction layer, by weight, comprises: 60 parts high-density polyethylene, 25 parts polypropylene elastomer, and 15 parts silicone masterbatch with SEBS as the carrier.

[0114] By weight, the raw materials for the transition layer include: 40 parts high-density polyethylene, 35 parts polypropylene elastomer, and 25 parts maleic anhydride-grafted EVA.

[0115] By weight, the adhesive layer comprises: 40 parts maleic anhydride-grafted EVA, 30 parts maleic anhydride-grafted LLDPE, 10 parts maleic anhydride-grafted POE, 8 parts maleic anhydride-grafted SEBS, 6 parts C5 petroleum resin, and 6 parts HIPS. Example 2

[0116] In this embodiment, the anti-corrosion base film sequentially comprises a low-friction layer, a transition layer, and an adhesive layer.

[0117] The raw materials for the low-friction layer, by weight, include: 65 parts high-density polyethylene, 30 parts polypropylene elastomer, and 15 parts silicone masterbatch with SEBS as the carrier.

[0118] The raw material composition of the transition layer and the adhesive layer is the same as that in Example 1. Example 3

[0119] In this embodiment, the anti-corrosion base film sequentially comprises a low-friction layer, a transition layer, and an adhesive layer.

[0120] The raw material composition of the low-friction layer is the same as that in Example 1.

[0121] By weight, the raw materials for the transition layer include: 60 parts high-density polyethylene, 15 parts polypropylene elastomer, and 25 parts maleic anhydride-grafted EVA.

[0122] The raw material composition of the adhesive layer is the same as that in Example 1. Example 4

[0123] In this embodiment, the anti-corrosion base film sequentially comprises a low-friction layer, a transition layer, and an adhesive layer.

[0124] By weight, the raw materials for the low-friction layer include: 60 parts of high-density polyethylene, 25 parts of polypropylene elastomer, and 15 parts of silicone masterbatch with HDPE as the carrier.

[0125] The raw material composition of the transition layer and the adhesive layer is the same as that in Example 1. Example 5

[0126] In this embodiment, the anti-corrosion base film sequentially comprises a low-friction layer, a transition layer, and an adhesive layer.

[0127] Low-friction layer raw material ratio: 60 parts high-density polyethylene, 25 parts polypropylene elastomer, and 15 parts silicone masterbatch with LLDPE as carrier.

[0128] The raw material composition of the transition layer and the adhesive layer is the same as that in Example 1. Comparative Example 1

[0129] The difference between the anti-corrosion base film in this comparative example and that in Example 1 is that the polypropylene elastomer in the low-friction layer is completely replaced with POE (a random copolymer elastomer that achieves in-situ polymerization of ethylene with high-carbon α-olefins such as 1-butene, 1-hexene, and 1-octene using a metallocene catalyst). Otherwise, it is basically the same as in Example 1. Comparative Example 2

[0130] The difference between the anti-corrosion base film in this comparative example and that in Example 1 is that the maleic anhydride-grafted EVA (ethylene-vinyl acetate copolymer) in the transition layer is completely replaced with maleic anhydride-grafted LLDPE (linear low-density polyethylene), while the rest is basically the same as in Example 1. Comparative Example 3

[0131] The difference between the anti-corrosion base film in this comparative example and that in Example 1 is that all the silicone masterbatch in the low-friction layer in this comparative example is replaced with HIPS (high-impact polystyrene), while the rest is basically the same as in Example 1. Comparative Example 4

[0132] The difference between the anti-corrosion base film in this comparative example and that in Example 1 is that all the silicone masterbatch in the low-friction layer in this comparative example is replaced with ultra-high molecular weight polyethylene. Otherwise, it is basically the same as Example 1. Comparative Example 5

[0133] The difference between the anti-corrosion base film in this comparative example and that in Example 1 is that the low-friction layer in this comparative example consists of 45 parts of high-density polyethylene, 25 parts of polypropylene elastomer, and 30 parts of silicone masterbatch with SEBS as the carrier. The rest is basically the same as in Example 1. Comparative Example 6

[0134] The difference between the anti-corrosion base film in this comparative example and that in Example 1 is that the transition layer is omitted, while the low-friction layer and adhesive layer are retained. Otherwise, it is basically the same as in Example 1. Example 6

[0135] The aforementioned anti-corrosion base film is applied to a metal clad panel, which sequentially comprises an anti-corrosion base film, a metal plate, a hot melt adhesive film, and a waterproof membrane.

[0136] The manufacturing conditions are as follows: hot-pressing temperature 200℃, pressure 0.6MPa, hot-pressing time 20s, TPO waterproof membrane thickness 0.8mm, and metal plate made of 0.6mm thick aluminized zinc-coated steel sheet with a coating weight of 150g / m². 2 .

[0137] The prepared metal-coated plate exhibited salt spray resistance for at least 1600 hours without the appearance of red rust. Tests and Results

[0138] The friction coefficient of the anti-corrosion base film was tested according to GB / T10006. Simultaneously, the anti-corrosion base films of Examples 1-5 and Comparative Examples 1-4 were bonded to metal plates using the method of Example 6 to form metal-coated panels. The salt spray resistance of the lower surface of the metal-coated panels was tested according to GB / T10125. The resulting metal-coated panels were then pressed into roof tiles to form building roofs, and it was observed whether damage occurred during the pressing process. The test results are shown in Table 1 below:

[0139] Table 1 Test Results

[0140]

[0141] Data from Example 1 and Comparative Example 1 show that polypropylene elastomer is more likely than POE elastomer to form a synergistic effect with high-density polyethylene and silicone masterbatch in terms of salt spray resistance. Data from Example 1 and Comparative Example 2 show that the maleic anhydride-grafted EVA in the transition layer has better compatibility with the main resin in the low-friction layer and adhesive layer, resulting in higher cohesive strength and better salt spray resistance of the anti-corrosion substrate. Test data from Example 1 and Comparative Example 3 show that without silicone masterbatch, the substrate has a higher coefficient of friction and no synergistic effect on salt spray resistance. Test data from Example 1 and Comparative Example 4 show that although the anti-corrosion substrate using ultra-high molecular weight polyethylene as a component of the low-friction layer has a lower coefficient of friction, no synergistic effect on salt spray resistance is produced. Test data from Example 1 and Comparative Example 5 show that increasing the amount of silicone masterbatch can reduce the coefficient of friction of the anti-corrosion substrate, but it also reduces the salt spray resistance of the anti-corrosion substrate; there is an appropriate ratio among the components in the low-friction layer that produces synergistic benefits. Test data from Example 1 and Comparative Example 6 show that removing the transition layer of the anti-corrosion base film reduces the cohesive strength of the anti-corrosion base film, leading to damage to the pressure tile and thus reducing the salt spray resistance of the anti-corrosion base film.

[0142] The present invention provides a low-friction coefficient, excellent corrosion resistance, and metal-plate composite anti-corrosion base film, comprising a low-friction layer, a transition layer, and an adhesive layer for the metal plate. The adhesive layer of the anti-corrosion base film bonds and composites the base film with the metal plate. The low-friction layer of the base film ensures that the metal-coated plate will not break during the pressing and forming process, improving the anti-corrosion performance of the polymer coating layer of the metal-coated plate. It can be applied to industrial plant interior environments with high anti-corrosion requirements. Compared with existing technologies, the advantages of the present invention are: 1. The low-friction layer of the base film overcomes the drawback of coatings or conventional anti-corrosion base films being easily damaged during the pressing and forming process of metal-coated plates; 2. The metal-plate adhesive layer of the base film can form reliable bonding strength after hot-pressing and composite with the metal plate, eliminating the need for glue, making it environmentally friendly and simple to process; 3. The low-friction component in the base film can produce a synergistic effect with other polymers in the base film, improving the overall anti-corrosion performance of the base film structure.

[0143] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An anti-corrosion base film, characterized in that: The film comprises, in sequence, a low-friction layer, a transition layer, and an adhesive layer. The adhesive layer is used to bond with a metal plate. The low-friction layer comprises an elastomer, a plastic body, and a silicone masterbatch. The low-friction layer is used to reduce the coefficient of friction of the anti-corrosion base film and to improve the anti-corrosion performance of the anti-corrosion base film.

2. The anti-corrosion base film according to claim 1, characterized in that: The mass ratio of the plastic body to the elastomer is 2:1 to 3:

1.

3. The anti-corrosion base film according to claim 1, characterized in that: The mass ratio between the plastic body and the silicone masterbatch is 4:1 to 5:

1.

4. The anti-corrosion base film according to claim 1, characterized in that: By weight, the low-friction layer comprises the following raw material components: 5-95 parts of elastomer 5-95 parts of plastisol 5-40 parts of silicone masterbatch.

5. The anti-corrosion base film according to claim 4, characterized in that: By weight, the low-friction layer comprises the following raw material components: 10-40 parts of elastomer 20-80 parts of plastic body 10-25 parts of silicone masterbatch.

6. The anti-corrosion base film according to claim 1, characterized in that: The elastomer is a polyolefin elastomer.

7. The anti-corrosion base film according to claim 1, characterized in that: The plastic body is a polyolefin plastic body.

8. The anti-corrosion base film according to claim 1, characterized in that: The carrier of the silicone masterbatch is one or more selected from high-density polyethylene, polystyrene, low-density polyethylene and propylene-based elastomers.

9. The anti-corrosion base film according to claim 1, characterized in that: The adhesive layer includes maleic anhydride-grafted EVA, maleic anhydride-grafted polyolefin plasmon, maleic anhydride-grafted polyolefin elastomer, maleic anhydride-grafted polystyrene elastomer, tackifying petroleum resin, and polystyrene elastomer.

10. The anti-corrosion base film according to claim 1 or 9, characterized in that: By weight, the adhesive layer comprises the following raw material components: 5-95 parts of maleic anhydride-grafted EVA 5-95 parts of maleic anhydride-grafted polyolefin plastic body 5-50 parts of maleic anhydride-grafted polyolefin elastomer 5-30 parts of maleic anhydride-grafted polystyrene elastomer 5-20 parts of tackifying petroleum resin 5-35 parts of polystyrene elastomer.

11. The anti-corrosion base film according to claim 10, characterized in that: By weight, the adhesive layer comprises the following raw material components: Maleic anhydride-grafted EVA 20-80 parts 20-60 parts of maleic anhydride-grafted polyolefin plastic body 5-20 parts of maleic anhydride-grafted polyolefin elastomer 5-10 parts of maleic anhydride-grafted polystyrene elastomer 5-10 parts of tackifying petroleum resin 5-25 parts of polystyrene elastomer.

12. The anti-corrosion base film according to claim 9, characterized in that: The content of VA in the maleic anhydride-grafted EVA is not higher than 28%; the maleic anhydride-grafted polyolefin plastomer is maleic anhydride-grafted linear low-density polyethylene; the maleic anhydride-grafted polyolefin elastomer is maleic anhydride-grafted POE; the maleic anhydride-grafted polystyrene elastomer is maleic anhydride-grafted SEBS or maleic anhydride-grafted HIPS; the tackifying petroleum resin is hydrogenated petroleum resin; the polystyrene elastomer is SIS, SBS, SEBS or HIPS.

13. The anti-corrosion base film according to claim 1, characterized in that: The transition layer includes a polyolefin elastomer and a polyolefin plastomer; the polyolefin elastomer is selected from one or more of polypropylene elastomer and polyethylene elastomer; the polyolefin plastomer is selected from one or more of polypropylene plastomer and polyethylene plastomer.

14. The anti-corrosion base film according to claim 13, characterized in that: By weight, the transition layer comprises the following raw material components: 10-75 parts of polyolefin elastomer 10-75 parts of polyolefin plastide 0-50 parts of maleic anhydride graft.

15. The anti-corrosion base film according to claim 14, characterized in that: The transition layer includes a maleic anhydride graft; the maleic anhydride graft is selected from one or more of maleic anhydride-grafted polyethylene, polypropylene, POE, EVA, SIS, and SEBS.

16. The anti-corrosion base film according to claim 14, characterized in that: By weight, the transition layer comprises the following raw material components: 20-60 parts of polyolefin elastomer 20-60 parts of polyolefin plastide 10-30 parts of maleic anhydride graft.

17. The anti-corrosion base film according to claim 1, characterized in that: The low-friction layer further includes additives, which include antioxidants and / or ultraviolet absorbers; the antioxidants are one or more selected from antioxidant 1010, antioxidant 1076, antioxidant 168, and antioxidant 264; the ultraviolet absorbers are one or more selected from UV327, UV531, UV770, and UV944.

18. The anti-corrosion base film according to claim 1, characterized in that: The thickness of the anti-corrosion base film is 30-200 μm, and the coefficient of friction on the low-friction layer side of the anti-corrosion base film is 0.19-0.

35.

19. A method for preparing an anti-corrosion base film as described in any one of claims 1-18, characterized in that: Includes the following steps: The raw materials for the low-friction layer, the transition layer, and the bonding layer are extruded and granulated respectively. The extruded granules are processed by casting, coating or blown film to prepare a three-layer composite film, which is the anti-corrosion base film.

20. The application of the anti-corrosion base film as described in any one of claims 1-18 in metal clad panels.

21. A metal-coated panel, characterized in that: The metal-coated panel comprises, in sequence, an anti-corrosion base film, a metal plate, a hot melt adhesive film, and a waterproof membrane as described in any one of claims 1-18.

22. The metal-coated plate according to claim 21, characterized in that: The metal-coated plate has a salt spray resistance of at least 1600 hours without the appearance of red rust.

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