Anticorrosive primer, method for preparing the same and use thereof

Abstract

The application discloses an anticorrosion base film, which comprises a low-friction layer, a transition layer and an adhesive layer in sequence, and the adhesive layer is used for bonding with a metal plate; the low-friction layer comprises an elastomer, a plastic body and silicone master particles; the low-friction layer is used for reducing the friction coefficient of the anticorrosion base film and improving the anticorrosion performance of the anticorrosion base film. The anticorrosion base film has low friction coefficient, can avoid breakage when being applied to a metal laminated plate pressing tile, and can further improve the anticorrosion effect; the production process is simple, one-time forming is adopted, oily and aqueous adhesives are not needed, and the production is completed by using high molecular materials; the anticorrosion base film has the characteristics of resisting tile press wear, having strong bonding force with the metal plate, excellent corrosion resistance and the like.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of anticorrosive primer and metal coated sheet, and particularly relates to a low-friction anticorrosive primer, a preparation method of the anticorrosive primer and application of the anticorrosive primer in a metal coated sheet. BACKGROUND

[0002] The metal coated sheet is a material composed of a high polymer and a metal plate, which is suitable for the fields of building, transportation and industry, and has the characteristics of corrosion resistance, light weight and durability. In particular, the corrosion resistance and easy processing performance of the metal coated sheet make it an ideal material for industrial and commercial building roofs.

[0003] At present, the lower surface of the metal coated sheet is generally treated by coating or a conventional anticorrosive primer for corrosion protection. However, when the coated sheet is formed into a tile by a tile press, the coating or the anticorrosive primer is easily damaged by the mechanical parts of the tile press, and the damaged parts of the coating or the anticorrosive primer will further reduce the corrosion resistance.

[0004] For example, the patent application with the publication number CN118269440A relates to a thermoplastic polyolefin elastomer plastic tile and a preparation method thereof, which uses a modified polyvinyl chloride film or a modified polyolefin film as an anticorrosive primer. However, the two kinds of anticorrosive primers are still prone to damage during the tile forming process of the plastic tile, and the damaged parts of the primer are prone to rust during the use of the plastic tile.

[0005] For another example, the patent with the publication number CN115570864B relates to a multifunctional coated sheet and a preparation method thereof, which adds graphene oxide and silicon powder to the anticorrosive primer. The graphene oxide and silicon powder have a very limited effect on reducing the friction coefficient of the anticorrosive primer, and the anticorrosive primer in this patent is also prone to damage during the tile forming process of the coated sheet.

[0006] The disclosure of the above background art is only used to assist in understanding the inventive concept and technical solutions of the present application, and does not necessarily belong to the prior art of the present patent application. In the absence of explicit evidence that the above content has been disclosed before the filing date of the present patent application, the above background art should not be used to evaluate the novelty and inventiveness of the present application. SUMMARY

[0007] Therefore, in order to overcome the defects of the prior art, the purpose of the present application is to provide an improved anticorrosive primer with a low-friction layer, which can further improve the corrosion resistance and adhesion effect.

[0008] In order to achieve the above purpose, the present application adopts the following technical solutions:

[0009] An anticorrosion primer comprises a low friction layer, a transition layer and an adhesive layer in sequence, the adhesive layer is used for bonding with a metal sheet; the low friction layer comprises an elastomer, a plastic body and silicone masterbatch; the low friction layer is used for reducing the friction coefficient of the anticorrosion primer and for improving the anticorrosion performance of the anticorrosion primer.

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

[0011] elastomer 5~95 parts

[0012] plastic body 5~95 parts

[0013] silicone masterbatch 5~40 parts.

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

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

[0016] elastomer 10~40 parts

[0017] plastic body 20~80 parts

[0018] silicone masterbatch 10~25 parts.

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

[0020] According to some preferred embodiments of the present application, 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 application, 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 elastomer.

[0022] According to some preferred embodiments of the present application, the adhesive layer comprises maleic anhydride grafted EVA, maleic anhydride grafted polyolefin plastic body, maleic anhydride grafted polyolefin elastomer, maleic anhydride grafted polystyrene-based elastomer and tackifying petroleum resin, polystyrene-based elastomer. The maleic anhydride grafting mainly provides the bonding performance with the metal sheet, and the tackifying petroleum resin and the polystyrene-based elastomer mainly adjust the interfacial wetting performance when the anticorrosion primer is hot-pressed with the metal sheet.

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

[0024] Maleic anhydride grafted EVA 5~95 parts

[0025] Maleic anhydride grafted polyolefin plastomer 5~95 parts

[0026] Maleic anhydride grafted polyolefin elastomer 5~50 parts

[0027] Maleic anhydride grafted polystyrene-based elastomer 5~30 parts

[0028] Tackifying petroleum resin 5~20 parts

[0029] Polystyrene-based elastomer 5~35 parts.

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

[0031] Maleic anhydride grafted EVA 20~80 parts

[0032] Maleic anhydride grafted polyolefin plastomer 20~60 parts

[0033] Maleic anhydride grafted polyolefin elastomer 5~20 parts

[0034] Maleic anhydride grafted polystyrene-based elastomer 5~10 parts

[0035] Tackifying petroleum resin 5~10 parts

[0036] Polystyrene-based elastomer 5~25 parts.

[0037] According to some preferred embodiments of the present application, 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 improve the adhesion of the corrosion-resistant primer to the metal plate and the forming of the primer; the maleic anhydride grafted polyolefin plastomer 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; and the polystyrene-based elastomer is SIS (styrene-isoprene-styrene block copolymer), SBS (styrene-butadiene-styrene block copolymer), SEBS (linear three-block copolymer with polystyrene as terminal segment and ethylene-butene copolymer obtained by hydrogenation of polybutadiene as middle elastic block), or HIPS (high-impact polystyrene).

[0038] According to some preferred embodiments of the present application, 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 application, the transition layer comprises the following ingredients by weight parts:

[0040] polyolefin elastomer 10-75 parts

[0041] polyolefin plastomer 10-75 parts

[0042] maleic anhydride graft 0-50 parts.

[0043] Preferably, the transition layer comprises the following ingredients by weight parts:

[0044] polyolefin elastomer 20-60 parts

[0045] polyolefin plastomer 20-60 parts

[0046] maleic anhydride graft 10-30 parts.

[0047] According to some preferred embodiments of the present application, 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 (a random copolymer elastomer of ethylene and a high carbon α-olefin such as 1-butene, 1-hexene, 1-octene, etc. by in-situ polymerization using a metallocene catalyst), EVA (ethylene-vinyl acetate copolymer), SIS (styrene-isoprene-styrene block copolymer), SEBS (a linear three-block 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 application, the low-friction layer further comprises an auxiliary agent, the auxiliary agent comprising an antioxidant and / or an ultraviolet absorber; the antioxidant is one or more selected from antioxidant 1010, antioxidant 1076, antioxidant 168, antioxidant 264; the ultraviolet absorber is one or more selected from UV 327, UV 531, UV 770 and UV 944.

[0049] According to some preferred embodiments of the present application, the anticorrosive primer has a thickness of 30-200 um, preferably a thickness of 40-120 um, and most preferably a thickness of 60-100 um. The low-friction layer on one side of the anticorrosive primer has a friction coefficient of 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 This 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 This 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] like Figure 1 As shown, 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] elastomer 5~95 parts by weight

[0072] plasticizer 5~95 parts by weight

[0073] silicone masterbatch 5~40 parts by weight.

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

[0075] elastomer 10~40 parts by weight

[0076] plasticizer 20~80 parts by weight

[0077] silicone masterbatch 10~25 parts by weight.

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

[0079] The auxiliary agent includes an antioxidant and / or an ultraviolet absorber; the antioxidant is one or more selected from the group consisting of antioxidant 1010, antioxidant 1076, antioxidant 168, and antioxidant 264; and the ultraviolet absorber is one or more selected from the group consisting of UV 327, UV 531, UV 770, and UV 944.

[0080] The adhesive layer includes a maleic anhydride grafted EVA, a maleic anhydride grafted polyolefin plasticizer, a maleic anhydride grafted polyolefin elastomer, a maleic anhydride grafted polystyrene-based elastomer, a tackifying petroleum resin, and a polystyrene-based elastomer. The maleic anhydride grafting agent mainly functions to provide adhesion to the metal plate, and the tackifying petroleum resin and the polystyrene-based elastomer mainly function to adjust the interfacial wetting properties when the corrosion-resistant primer is hot-pressed and combined with the metal plate.

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

[0082] maleic anhydride grafted EVA 5~95 parts by weight

[0083] maleic anhydride grafted polyolefin plasticizer 5~95 parts by weight

[0084] maleic anhydride grafted polyolefin elastomer 5~50 parts by weight

[0085] maleic anhydride grafted polystyrene-based elastomer 5~30 parts by weight

[0086] tackifying petroleum resin 5~20 parts by weight

[0087] polystyrene-based elastomer 5~35 parts by weight.

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

[0089] Maleic anhydride grafted EVA 20~80 parts

[0090] Maleic anhydride grafted polyolefin plastomer 20~60 parts

[0091] Maleic anhydride grafted polyolefin elastomer 5~20 parts

[0092] Maleic anhydride grafted polystyrene elastomer 5~10 parts

[0093] Tackifying petroleum resin 5~10 parts

[0094] Polystyrene elastomer 5~25 parts.

[0095] 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 improve the adhesion of the corrosion-resistant primer to the metal plate and the forming of the primer; the maleic anhydride grafted polyolefin plastomer is a maleic anhydride grafted linear low-density polyethylene; the maleic anhydride grafted polyolefin elastomer is a maleic anhydride grafted POE; the maleic anhydride grafted polystyrene elastomer is a maleic anhydride grafted SEBS (hydrogenated styrene-butadiene block copolymer) or a maleic anhydride grafted HIPS (high-impact polystyrene); the tackifying petroleum resin is a hydrogenated petroleum resin; and the polystyrene elastomer is SIS (styrene-isoprene-styrene block copolymer), SBS (styrene-butadiene-styrene block copolymer), SEBS (linear three-embedded copolymer with polystyrene as the terminal segment and ethylene-butene copolymer obtained by hydrogenation of polybutadiene as the middle elastic embedded segment), or HIPS (high-impact polystyrene).

[0096] The transition layer includes a polyolefin elastomer, a polyolefin plastomer, and selectively added maleic anhydride grafting, which mainly functions to firmly bond the low-friction layer and the metal-adhesive layer together during the forming of the corrosion-resistant primer, and to provide the overall cohesive strength of the low film.

[0097] The transition layer includes the following raw material components by weight parts:

[0098] Polyolefin elastomer 10~75 parts

[0099] Polyolefin plastomer 10~75 parts

[0100] Maleic anhydride grafting 0~50 parts.

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

[0102] Polyolefin elastomer 20~60 parts

[0103] Polyolefin plastomer 20-60 parts

[0104] Maleic anhydride graft 10-30 parts.

[0105] 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 (a random copolymer elastomer of ethylene and a high-carbon alpha-olefin such as 1-butene, 1-hexene, 1-octene, etc. to realize in-situ polymerization by using a metallocene catalyst), EVA (ethylene-vinyl acetate copolymer), SIS (styrene-isoprene-styrene block copolymer), SEBS (a linear three-block copolymer with polystyrene as the terminal segment and ethylene-butene copolymer obtained by hydrogenation of polybutadiene as the middle elastic block).

[0106] The anticorrosion base film can be produced by a process of casting, curtain coating or blown film. When the blown film process is used, the specific preparation process is as follows:

[0107] The raw materials of the outer layer of the film are added to the twin-screw extruder for granulation, and the extrusion temperature is 140-200℃;

[0108] The raw materials of the transition layer of the film are added to the twin-screw extruder for granulation, and the extrusion temperature is 150-200℃;

[0109] The raw materials of the inner layer of the film are added to the twin-screw extruder for granulation, and the extrusion temperature is 130-190℃;

[0110] The particles prepared by the twin-screw extruder are prepared into a three-layer composite film by a three-layer blown film machine, and the temperature of the co-extrusion die head is 140-190℃.

[0111] The thickness of the anticorrosion base film is 30-200um, preferably 40-120um, and most preferably 60-100um. The friction coefficient of the low-friction layer of the anticorrosion base film is 0.19-0.35. When the anticorrosion base film is applied to a metal laminated plate, the salt spray resistance is at least 1600h without red rust.

[0112] Example 1

[0113] The anticorrosion base film in this example includes a low-friction layer exposed on the lowermost surface, an adhesive layer bonded to the metal plate, and a transition layer connecting the low-friction layer and the adhesive layer.

[0114] The raw materials of the low-friction layer include, by weight parts, high-density polyethylene 60 parts, polypropylene elastomer 25 parts, and silicone masterbatch with SEBS as the carrier 15 parts.

[0115] The raw materials of the transition layer include, by weight parts, high-density polyethylene 40 parts, polypropylene elastomer 35 parts, and maleic anhydride grafted EVA 25 parts.

[0116] The raw materials of the adhesive layer include, by weight parts, maleic anhydride grafted EVA 40 parts, maleic anhydride grafted LLDPE 30 parts, maleic anhydride grafted POE 10 parts, maleic anhydride grafted SEBS 8 parts, C5 petroleum resin 6 parts, and HIPS 6 parts.

[0117] Example 2

[0118] The anticorrosive primer in this example sequentially includes a low-friction layer, a transition layer, and an adhesive layer.

[0119] The raw materials of the low-friction layer include, by weight parts, high-density polyethylene 65 parts, polypropylene elastomer 30 parts, and silicone masterbatch with SEBS as a carrier 15 parts.

[0120] The raw material components of the transition layer and the adhesive layer are the same as in Example 1.

[0121] Example 3

[0122] The anticorrosive primer in this example sequentially includes a low-friction layer, a transition layer, and an adhesive layer.

[0123] The raw material components of the low-friction layer are the same as in Example 1.

[0124] The raw materials of the transition layer include, by weight parts, high-density polyethylene 60 parts, polypropylene elastomer 15 parts, and maleic anhydride grafted EVA 25 parts.

[0125] The raw material components of the adhesive layer are the same as in Example 1.

[0126] Example 4

[0127] The anticorrosive primer in this example sequentially includes a low-friction layer, a transition layer, and an adhesive layer.

[0128] The raw materials of the low-friction layer include, by weight parts, high-density polyethylene 60 parts, polypropylene elastomer 25 parts, and silicone masterbatch with HDPE as a carrier 15 parts.

[0129] The raw material components of the transition layer and the adhesive layer are the same as in Example 1.

[0130] Example 5

[0131] The anticorrosive primer in this example sequentially includes a low-friction layer, a transition layer, and an adhesive layer.

[0132] The raw material components of the low-friction layer are the same as in Example 1.

[0133] The raw material components of the transition layer and the adhesive layer are the same as those of Example 1.

[0134] Comparative Example 1

[0135] The anticorrosion primer in the present comparative example is different from Example 1 in that the polypropylene elastomer in the low-friction layer is replaced by POE (a random copolymer elastomer of ethylene and a high-carbon a-olefin such as 1-butene, 1-hexene, 1-octene, etc. that realizes in-situ polymerization) in the present comparative example, and the other components are basically the same as those of Example 1.

[0136] Comparative Example 2

[0137] The anticorrosion primer in the present comparative example is different from Example 1 in that the maleic anhydride grafted EVA (ethylene-vinyl acetate copolymer) in the transition layer is replaced by maleic anhydride grafted LLDPE (linear low-density polyethylene) in the present comparative example, and the other components are basically the same as those of Example 1.

[0138] Comparative Example 3

[0139] The anticorrosion primer in the present comparative example is different from Example 1 in that the silicone masterbatch in the low-friction layer is replaced by HIPS (high-impact polystyrene) in the present comparative example, and the other components are basically the same as those of Example 1.

[0140] Comparative Example 4

[0141] The anticorrosion primer in the present comparative example is different from Example 1 in that the silicone masterbatch in the low-friction layer is replaced by ultra-high molecular weight polyethylene in the present comparative example, and the other components are basically the same as those of Example 1.

[0142] Comparative Example 5

[0143] The anticorrosion primer in the present comparative example is different from Example 1 in that the low-friction layer is composed of 45 parts of high-density polyethylene, 25 parts of polypropylene elastomer, and 30 parts of silicone masterbatch with SEBS as the carrier, and the other components are basically the same as those of Example 1.

[0144] Comparative Example 6

[0145] The anticorrosion primer in the present comparative example is different from Example 1 in that the transition layer is removed, and the low-friction layer and the adhesive layer are retained, and the other components are basically the same as those of Example 1.

[0146] Example 6 (Preparation of Metal Cladding Panel)

[0147] The above anticorrosion primer is applied to a metal cladding panel, which comprises, in sequence, the anticorrosion primer, a metal plate, a hot melt adhesive film, and a waterproof roll material.

[0148] The preparation conditions are: hot-pressing temperature 200℃, pressure 0.6MPa, hot-pressing time 20s, TPO waterproofing membrane thickness 0.8mm, metal plate is aluminum-zinc plated steel plate with thickness 0.6mm, plating layer weight 150g / m 2 .

[0149] The prepared metal-clad plate has salt spray resistance of at least 1600h without red rust.

[0150] Test and results

[0151] The friction coefficient of the corrosion-resistant primer is tested according to GB / T10006. Meanwhile, the corrosion-resistant primer of Examples 1-5 and Comparative Examples 1-4 is bonded to a metal plate to prepare a metal-clad plate according to the method of Example 6, the salt spray resistance of the lower surface of the metal-clad plate is tested according to GB / T10125, and the prepared metal-clad plate is pressed into a tile to form a building roof, and whether the tile is damaged during pressing is observed. The test results are shown in Table 1 below:

[0152]

[0153] The data of Example 1 and Comparative Example 1 show that the polypropylene elastomer is more likely to produce a synergistic effect with high-density polyethylene and silicone masterbatch in salt spray resistance than the POE elastomer. The data of Example 1 and Comparative Example 2 show that the maleic anhydride grafted EVA in the transition layer has better compatibility with the main resins in the low-friction layer and the bonding layer, the corrosion-resistant primer has higher cohesive strength, and the corrosion-resistant primer has better salt spray resistance. The test data of Example 1 and Comparative Example 3 show that without using silicone masterbatch, the friction coefficient of the primer is higher, and no synergistic effect in salt spray resistance is produced. The test data of Example 1 and Comparative Example 4 show that although the friction coefficient of the corrosion-resistant primer using ultra-high molecular weight polyethylene as a component of the low-friction layer is lower, no synergistic effect in salt spray resistance is produced. The test data of Example 1 and Comparative Example 5 show that increasing the amount of silicone masterbatch can reduce the friction coefficient of the corrosion-resistant primer, but also reduces the salt spray resistance of the corrosion-resistant primer, and there is an appropriate ratio between the components in the low-friction layer to produce a synergistic effect. The test data of Example 1 and Comparative Example 6 show that removing the transition layer of the corrosion-resistant primer reduces the cohesive strength of the corrosion-resistant primer, leading to damage to the tile during pressing, thereby reducing the salt spray resistance of the corrosion-resistant primer.

[0154] The anticorrosion primer film of the present application has low friction coefficient, excellent corrosion resistance and can be combined with metal plate, which comprises low friction layer, transition layer and adhesive layer for metal plate in sequence. The adhesive layer of the anticorrosion primer film of the present application can bond and combine the primer film and metal plate together, the low friction layer of the primer film can ensure that the metal laminated plate will not be damaged when being pressed into tile, improve the corrosion resistance of the polymer coating layer of the metal laminated plate, and can be applied to the internal use environment of industrial plant with high requirements for corrosion resistance. Compared with the prior art, the advantages of the present application are: 1. The low friction layer of the primer film can overcome the disadvantage that the coating or conventional anticorrosion primer film is easily damaged when the metal laminated plate is pressed into tile; 2. The metal adhesive layer of the primer film can form reliable adhesive strength after hot pressing combination with the metal plate, eliminating the use of glue, being environmentally friendly and simple in process; 3. The low friction component in the primer film can produce synergistic effect with other polymers in the primer film, improving the overall corrosion resistance of the primer film structure.

[0155] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. An anticorrosive primer characterized by: The low friction layer, the transition layer and the adhesive layer are sequentially arranged, and the adhesive layer is used for bonding with the metal plate; the low friction layer is used for reducing the friction coefficient of the anticorrosive primer and improving the anticorrosive performance of the anticorrosive primer; The low friction layer comprises the following raw material components: elastomer 5~95 parts plastic body 5~95 parts silicone master batch 5~40 parts; The mass ratio of the plastic body and the elastomer is 2:1~3:1; the mass ratio between the plastic body and the silicone master batch is 4:1~5:1; The elastomer is a polypropylene elastomer; the plastic body is a polypropylene plastic body and / or a high-density polyethylene plastic body; the carrier of the silicone master batch is selected from one or more of high-density polyethylene, polystyrene, low-density polyethylene and propylene-based elastomer; The transition layer comprises the following raw material components by weight parts: polyolefin elastomer 20~60 parts polyolefin plastic body 20~60 parts maleic anhydride grafting 10~30 parts; The maleic anhydride grafting is maleic anhydride grafted EVA.

2. The anticorrosive primer according to claim 1, characterized by: The low friction layer comprises the following raw material components by weight parts: elastomer 10~40 parts plastic body 20~80 parts silicone master batch 10~25 parts.

3. The anticorrosive primer according to claim 1, characterized by: The adhesive layer comprises maleic anhydride grafted EVA, maleic anhydride grafted polyolefin plastic body, maleic anhydride grafted polyolefin elastomer, maleic anhydride grafted polystyrene-based elastomer, tackifying petroleum resin and polystyrene-based elastomer.

4. The anticorrosive primer according to claim 1 or 3, characterized by: The adhesive layer comprises the following raw material components by weight parts: maleic anhydride grafted EVA 5~95 parts maleic anhydride grafted polyolefin plastic body 5~95 parts maleic anhydride grafted polyolefin elastomer 5~50 parts maleic anhydride grafted polystyrene-based elastomer 5~30 parts tackifying petroleum resin 5~20 parts polystyrene-based elastomer 5~35 parts.

5. The anticorrosive primer according to claim 4, characterized in that: The adhesive layer comprises the following raw material components by weight parts: maleic anhydride grafted EVA 20~80 parts maleic anhydride grafted polyolefin plastic body 20~60 parts maleic anhydride grafted polyolefin elastomer 5~20 parts maleic anhydride grafted polystyrene-based elastomer 5~10 parts tackifying petroleum resin 5~10 parts polystyrene-based elastomer 5~25 parts.

6. The anticorrosive primer according to claim 3, characterized in that: The content of VA in the maleic anhydride grafted EVA is not higher than 28%; 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 or maleic anhydride grafted HIPS; the tackifying petroleum resin is hydrogenated petroleum resin; and the polystyrene-based elastomer is SIS, SBS, SEBS or HIPS.

7. The anticorrosive primer according to claim 1, characterized in that: The polyolefin elastomer is selected from one or more of polypropylene elastomer and polyethylene elastomer; and the polyolefin plastic body is selected from one or more of polypropylene plastic body and polyethylene plastic body.

8. The anticorrosive primer according to claim 1, characterized in that: The low-friction layer further comprises an auxiliary agent, the auxiliary agent comprising an antioxidant and / or an ultraviolet absorber; the antioxidant being one or more selected from the group consisting of antioxidant 1010, antioxidant 1076, antioxidant 168, and antioxidant 264; the ultraviolet absorber being one or more selected from the group consisting of UV 327, UV 531, UV 770, and UV 944.

9. The anticorrosive primer according to claim 1, characterized in that: The thickness of the anticorrosion primer is 30-200 um, and the friction coefficient of the low-friction layer side of the anticorrosion primer is 0.19-0.

35.

10. A method of preparing the anticorrosive primer according to any one of claims 1 to 9, characterized by: The method comprises the following steps: The raw materials of the low-friction layer, the raw materials of the transition layer, and the raw materials of the adhesive layer are respectively extrusion granulated; The extrusion granulated particles are prepared into a three-layer composite film through casting, curtain coating, or blown film, which is the anticorrosion primer.

11. Use of the anticorrosion primer according to any one of claims 1-9 in a metal laminated plate.

12. A metal-clad plate, characterized by: The metal laminated plate comprises, in sequence, the anticorrosion primer according to any one of claims 1-9, a metal plate, a hot melt adhesive film, and a waterproof roll material.

13. The metal-clad sheet of claim 12, wherein: The salt spray resistance of the metal laminated plate is at least 1600 h without red rust.

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