A multi-layer co-extruded outdoor weather-resistant film

Abstract

The present invention relates to the field of film technology, and more specifically, to a multi-layer co-extruded outdoor weather-resistant film. From top to bottom, it includes a corrosion-resistant layer 1, a functional color layer 2, and an adhesive layer 3; the thickness of the corrosion-resistant layer 1 is 5-15 μm; the thickness of the functional color layer 2 is 5-40 μm; and the thickness of the adhesive layer 3 is 5-18 μm. The three-layer co-extruded outdoor weather-resistant film provided by the present invention can be used outdoors for a long time in harsh environments, ensures the vividness of the color for a long time, and has excellent weather resistance, excellent corrosion resistance, and excellent water vapor barrier properties.

Description

Technical Field

[0001] The present invention relates to the field of film technology, and in particular to a multi-layer co-extruded outdoor weather-resistant film. Background Art

[0002] With the development of social economy, people's living standards are gradually improving, people's requirements for quality of life are getting higher and higher, and people's requirements for building materials and decorative materials used in living environment are also getting higher and higher. Traditional building materials and decorative materials are mostly natural materials, including stone, wood, etc.

[0003] Since most traditional building materials are non-renewable resources and have an increasing impact on the environment during mining and processing, more and more polymer composite building materials have been developed, among which polyvinyl chloride is one of them. However, polyvinyl chloride still has some fatal shortcomings, which has led to its slow development in outdoor use. Since the chlorine atoms on the side chains are unstable, the light, heat and oxygen stability of polyvinyl chloride are extremely poor. Therefore, its outdoor use is greatly restricted in actual use, which is most directly manifested in a short service life and high replacement costs. Therefore, it is necessary to provide a weather-resistant film that can be used outdoors for a long time.

[0004] Polyvinylidene fluoride (PVDF) has special properties such as excellent chemical resistance and outdoor weather resistance, high mechanical strength and good thermal stability, excellent stain resistance and sterilization ability, effective UV blocking, complete resistance to sunlight degradation, high dielectric strength and volume resistivity, and lower production cost than other fluoropolymers. It has been widely used in various fields. Summary of the invention

[0005] In order to solve the above problems, the first aspect of the present invention provides a multi-layer co-extruded outdoor weather-resistant film, which includes, from top to bottom, a corrosion-resistant layer 1, a functional color layer 2, and an adhesive layer 3; the thickness of the corrosion-resistant layer 1 is 5-15μm; the thickness of the functional color layer 2 is 5-40μm; the thickness of the adhesive layer 3 is 5-18μm.

[0006] As a preferred technical solution, the component of the corrosion-resistant layer 1 is a modified polyvinylidene fluoride material, and the modified polyvinylidene fluoride material includes the following preparation raw materials in parts by weight: 70-90 parts of polyvinylidene fluoride, 0.1-2 parts of nucleating agent, 0.1-2 parts of ultraviolet absorber A, 0.1-2 parts of antioxidant, 0.1-2 parts of dispersant A, and 5-10 parts of methacrylic resin.

[0007] As a preferred technical solution, the component of the functional color layer 2 is polyvinylidene fluoride / methacrylic resin modified material, and the polyvinylidene fluoride / methacrylic resin modified material includes the following preparation raw materials in parts by weight: 60-80 parts of polyvinylidene fluoride, 5-20 parts of inorganic filler, 1-10 parts of colorant, 5-15 parts of methacrylic resin, 10-20 parts of acrylic resin, 0.1-2 parts of dispersant B, and 0.1-2 parts of ultraviolet absorber B.

[0008] As a preferred technical solution, the components of the bonding layer 3 are acrylic resin and methacrylic resin modified materials, and the acrylic resin and methacrylic resin modified materials include the following preparation raw materials in parts by weight: 10-30 parts of methacrylic resin, 40-80 parts of acrylic resin, 5-20 parts of polyvinylidene fluoride, 0.1-2 parts of antioxidant, 0.1-2 parts of hydrolysis resistance agent, and 0.1-2 parts of ultraviolet absorber C.

[0009] As a preferred technical solution, the molecular weight of the polyvinylidene fluoride is 300,000-500,000.

[0010] As a preferred technical solution, the molecular weight of the methacrylic resin is 100,000-200,000; the molecular weight of the acrylic resin is 50,000-180,000.

[0011] As a preferred technical solution, the ultraviolet absorber A is a hindered amine light stabilizer; the ultraviolet absorber B is a hindered phenol ultraviolet absorber; and the ultraviolet absorber C is a triazine ultraviolet absorber.

[0012] As a preferred technical solution, the antioxidant is a phosphite antioxidant.

[0013] As a preferred technical solution, the inorganic filler is selected from one or more of titanium dioxide, calcium carbonate, and talcum powder; and the colorant is a phthalocyanine series and / or an azo series.

[0014] The second aspect of the present invention provides a method for preparing a multi-layer co-extruded outdoor weather-resistant film, comprising the following steps: adding a polyvinylidene fluoride modified material, a polyvinylidene fluoride / methacrylic resin modified material, an acrylic resin and a methacrylic resin modified material into three different extruders respectively, and then extruding the melts from the three different extruders through a collector, cooling and shaping, and then corona treating the surface of the adhesive layer 3, trimming, and winding to obtain the film.

[0015] Beneficial effects: The three-layer co-extruded outdoor weather-resistant film provided by the present invention has a corrosion-resistant layer composed of polyvinylidene fluoride modified material, which has excellent weather resistance, solvent resistance and corrosion resistance; the functional color layer is composed of polyvinylidene fluoride / methacrylic resin modified material, and color diversity is achieved by adding colorants and inorganic fillers, and has good weather resistance, water vapor barrier and color diversity; the adhesive layer is composed of acrylic resin and methacrylic resin modified material, which has good bonding properties with PVC and ASA in the decoration industry and metal sheets in the building materials industry, which is conducive to the firm bonding of the film with the surface of the protection component, and has excellent water vapor barrier. Therefore, this protective film can be used outdoors for a long time in harsh environments, ensuring the vividness of the color for a long time, and has excellent weather resistance, excellent corrosion resistance and excellent water vapor barrier. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a schematic diagram of the structure of a multi-layer co-extruded outdoor weather-resistant film.

[0018] Figure numerals: 1 - corrosion-resistant layer; 2 - functional color layer; 3 - bonding layer; 4 - porous structure; 5 - mesh. DETAILED DESCRIPTION

[0019] The content of the present invention can be more easily understood by selecting the following detailed description of the preferred implementation method of the present invention and the embodiments included. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those of ordinary skill in the art to which the present invention belongs. When there is a conflict, the definition in this specification shall prevail.

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0022] The meaning of "and / or" in the present invention means that both the cases where each exists alone or both exist at the same time are included.

[0023] The term “connection” as used in the present invention may mean a direct connection between components or an indirect connection between components via other components.

[0024] The first aspect of the present invention provides a multi-layer co-extruded outdoor weather-resistant film, which includes, from top to bottom, a corrosion-resistant layer 1, a functional color layer 2, and an adhesive layer 3; the thickness of the corrosion-resistant layer 1 is 5-15μm; the thickness of the functional color layer 2 is 5-40μm; the thickness of the adhesive layer 3 is 5-18μm.

[0025] In a preferred embodiment, the thickness of the corrosion-resistant layer 1 is 8-14 μm; the thickness of the functional color layer 2 is 10-35 μm; and the thickness of the bonding layer 3 is 6-15 μm.

[0026] In a most preferred embodiment, the thickness of the corrosion-resistant layer 1 is 10 μm; the thickness of the functional color layer 2 is 23 μm; and the thickness of the bonding layer 3 is 12 μm.

[0027] Corrosion resistant layer

[0028] The corrosion-resistant layer of the present invention is a planar structure.

[0029] In one embodiment, the corrosion-resistant layer 1 is composed of a modified polyvinylidene fluoride material, which includes the following raw materials in parts by weight: 70-90 parts of polyvinylidene fluoride, 0.1-2 parts of a nucleating agent, 0.1-2 parts of an ultraviolet absorber A, 0.1-2 parts of an antioxidant, 0.1-2 parts of a dispersant A, and 5-10 parts of a methacrylic resin.

[0030] In a preferred embodiment, the nucleating agent is an oxide nucleating agent.

[0031] In a preferred embodiment, the oxide nucleating agent is selected from a mixture of one or more of nano-silicon dioxide, nano-titanium dioxide, magnesium oxide, and zinc oxide whiskers.

[0032] In a preferred embodiment, the oxide nucleating agent is nano-silicon dioxide.

[0033] In one embodiment, the ultraviolet absorber A is a hindered amine light stabilizer.

[0034] The hindered amine light stabilizer of the present invention is HA505 produced by Ciba-Geigy.

[0035] The inventor has found after a long period of research that by selecting the above-mentioned hindered amine light stabilizer as the ultraviolet absorber of the outer layer polyvinylidene fluoride modified material, not only the light stability of the outer layer can be improved, but also its oxidation resistance and thermal stability can be improved. The possible reason is that the hindered amine light stabilizer can not only improve the light stabilization effect of the polyvinylidene fluoride modified material through the self-synergistic effect between molecules, but also can remove the acidic substances hydrolyzed by the phosphite antioxidant, thereby improving the antioxidant performance of the polyvinylidene fluoride modified material. In addition, HA505 contains percarbonate groups, which can form stable chemical bonds in the system, thereby improving the thermal stability of the polyvinylidene fluoride modified material. The inventor has also unexpectedly found after a long period of research that the present invention selects the combination of the above-mentioned hindered amine light stabilizer as the ultraviolet absorber in the polyvinylidene fluoride modification of the outer layer, which can ensure that it will not precipitate in the outer layer.

[0036] In a preferred embodiment, the antioxidant is a phosphite antioxidant.

[0037] The phosphite antioxidant is antioxidant 619 from Cytec Corporation of the United States.

[0038] In a preferred embodiment, the dispersant is hydroxylated ethylene bisstearamide.

[0039] In a preferred embodiment, the preparation method of the polyvinylidene fluoride modified material comprises the following steps: adding the raw materials of the above proportion into a mixer for mixing, mixing at a rotation speed of 600 rpm for 3-7 minutes, then mixing at 100 rpm for 8-12 minutes to obtain a mixture, and finally adding the mixture into a twin-screw extruder for extrusion granulation.

[0040] In a preferred embodiment, the temperature of the twin-screw extruder is 170° C., the speed of the twin-screw extruder is 300 rpm, the vacuum degree is 0.8, and a conveyor belt pulling method is used.

[0041] Functional color layer

[0042] The functional color layer 2 of the present invention is a porous structure 4; the pore size of the porous structure 4 is 0.1-0.3 μm. The porous structure 4 of the present invention is not limited in shape, and is preferably a circular porous structure.

[0043] In a preferred embodiment, the pore size of the porous structure 4 is 0.2 μm.

[0044] In one embodiment, the component of the functional color layer 2 is polyvinylidene fluoride / methacrylic resin modified material, and the polyvinylidene fluoride / methacrylic resin modified material includes the following preparation raw materials in parts by weight: 60-80 parts of polyvinylidene fluoride, 5-20 parts of inorganic filler, 1-10 parts of colorant, 5-15 parts of methacrylic resin, 10-20 parts of acrylic resin, 0.1-2 parts of dispersant B, and 0.1-2 parts of ultraviolet absorber B.

[0045] In a preferred embodiment, the inorganic filler is selected from one or more of titanium dioxide, calcium carbonate and talc.

[0046] In a more preferred embodiment, the inorganic filler is titanium dioxide.

[0047] In a preferred embodiment, the colorant is a phthalocyanine series and / or an azo series.

[0048] The present invention does not impose strict restrictions on the colorant, but phthalocyanine series are preferred.

[0049] In a preferred embodiment, the dispersant B is a silane dispersant.

[0050] In a preferred embodiment, the silane dispersant is selected from the American Momentive One or more of a series of vinyl silanes, amino silanes, mercapto silanes, urea silanes, epoxy silanes, isocyanate silanes, and silane esters.

[0051] The present invention does not strictly limit the specific substance of the silane dispersant, but preferably it is a silane ester, and more preferably it is Maitu A-1230 produced by Guangzhou Soman Trading Co., Ltd.

[0052] In a preferred embodiment, the ultraviolet absorber B is a hindered phenol ultraviolet absorber.

[0053] In a preferred embodiment, the hindered phenolic ultraviolet absorber is UV-2908 from Cytec Corporation of the United States.

[0054] In a preferred embodiment, the preparation method of the polyvinylidene fluoride / methacrylic acid resin modified material comprises the following steps: adding the raw materials of the above proportion into a mixer for mixing, mixing at a rotation speed of 600 rpm for 8-12 minutes, then mixing at 100 rpm for 3-6 minutes to obtain a mixture, and finally adding the mixture into a twin-screw extruder for extrusion granulation, homogenization and drying to obtain the mixture.

[0055] In a preferred embodiment, the temperature of the twin-screw extruder is 190° C., the speed of the twin-screw extruder is 300 rpm, the vacuum degree is 0.8, and an underwater strip drawing method is used.

[0056] Adhesive layer

[0057] The bonding layer 3 of the present invention is a mesh structure; the mesh 5 of the mesh structure has a size of 0.5-1 μm.

[0058] In a preferred embodiment, the mesh size of the mesh structure 5 is 0.8 μm.

[0059] In a preferred embodiment, the adhesive layer 3 is composed of modified acrylic resin and methacrylic resin, and the modified acrylic resin and methacrylic resin include the following raw materials in parts by weight: 10-30 parts of methacrylic resin, 40-80 parts of acrylic resin, 5-20 parts of polyvinylidene fluoride, 0.1-2 parts of antioxidant, 0.1-2 parts of hydrolysis resistance agent, and 0.1-2 parts of ultraviolet absorber C.

[0060] In a preferred embodiment, the anti-hydrolysis agent is a hindered aromatic carbodiimide anti-hydrolysis stabilizer.

[0061] The hindered aromatic carbodiimide hydrolysis-resistant stabilizer was purchased from Beijia Fine Chemical Co., Ltd. as anti-hydrolysis agent K-1.

[0062] In a preferred embodiment, the ultraviolet absorber C is a triazine ultraviolet absorber.

[0063] In a preferred embodiment, the triazine ultraviolet absorber is UV-1164 produced by Cytec Corporation of the United States.

[0064] The UV1164 of the present invention has a high molecular weight and low volatility during high-temperature processing of polymers.

[0065] In a preferred embodiment, the preparation method of the modified acrylic resin and methacrylic resin comprises the following steps: firstly grinding the above raw materials, then adding them into a mixer according to the above ratio for mixing, mixing at a rotation speed of 600 rpm for 6-10 min, then mixing at 100 rpm for 15-35 min to obtain a mixture, and finally adding the mixture into a twin-screw extruder for extrusion granulation, homogenizing and drying.

[0066] In a preferred embodiment, the temperature of the twin-screw extruder is 160° C., the speed of the twin-screw extruder is 450 rpm, the vacuum degree is 0.8, an underwater stranding method is used, and a soft rubber pelletizer is adopted.

[0067] In a preferred embodiment, the molecular weight of the polyvinylidene fluoride is 300,000-500,000.

[0068] In a more preferred embodiment, the polyvinylidene fluoride is purchased from Arkema 1000HD in France, and has a molecular weight of 360,000.

[0069] In a preferred embodiment, the molecular weight of the methacrylic resin is 100,000-200,000.

[0070] In a preferred embodiment, the methacrylic resin is purchased from Arkema BS203 in France.

[0071] In a preferred embodiment, the molecular weight of the acrylic resin is 50,000-180,000.

[0072] In a preferred embodiment, the acrylic resin is purchased from Acrylic K-355P of Rohm and Haas Company in the United States.

[0073] The second aspect of the present invention provides a method for preparing a multi-layer co-extruded outdoor weather-resistant film, comprising the following steps: adding a polyvinylidene fluoride modified material, a polyvinylidene fluoride / methacrylic resin modified material, an acrylic resin and a methacrylic resin modified material into three different extruders respectively, and then extruding the melts from the three different extruders through a collector, cooling and shaping, and then corona treating the surface of the adhesive layer 3, trimming, and winding to obtain the film.

[0074] The present invention will be further described below with reference to specific embodiments.

[0075] Example

[0076] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with specific implementation methods. It is necessary to point out that the following examples are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by professionals and technicians in this field according to the content of the present invention still belong to the scope of protection of the present invention. In addition, if there is no other explanation, the raw materials used are all commercially available.

[0077] Example 1

[0078] Example 1 provides a multi-layer co-extruded outdoor weather-resistant film, such as Figure 1As shown, from top to bottom, it includes a corrosion-resistant layer 1, a functional color layer 2, and a bonding layer 3; the corrosion-resistant layer 1 is a planar structure; the thickness of the corrosion-resistant layer 1 is 10μm; the functional color layer 2 is a circular porous structure 3; the pore size of the circular porous structure 3 is 0.2μm; the thickness of the functional color layer 2 is 23μm; the bonding layer 3 is a mesh structure; the mesh 5 size of the mesh structure is 0.8μm; the thickness of the bonding layer 3 is 12μm.

[0079] The corrosion-resistant layer 1 is composed of modified polyvinylidene fluoride, which includes the following raw materials in parts by weight: 80 parts of polyvinylidene fluoride, 1 part of nucleating agent, 1.2 parts of ultraviolet absorber A, 0.8 parts of antioxidant, 0.8 parts of dispersant A, and 8 parts of methacrylic resin.

[0080] The nucleating agent is nano silicon dioxide.

[0081] The ultraviolet absorber A is HA505 from Ciba-Geigy.

[0082] The antioxidant is antioxidant 619 from Cytec Corporation of the United States.

[0083] The dispersant A is hydroxylated ethylene bisstearamide.

[0084] The preparation method of the polyvinylidene fluoride modified material comprises the following steps: adding the raw materials of the above proportion into a mixer for mixing, mixing at a rotation speed of 600 rpm for 5 minutes, then mixing at 100 rpm for 10 minutes to obtain a mixture, and finally adding the mixture into a twin-screw extruder for extrusion and granulation.

[0085] The temperature of the twin-screw extruder is 170° C., the speed of the twin-screw extruder is 300 rpm, the vacuum degree is 0.8, and a conveyor belt pulling method is used.

[0086] The functional color layer 2 is composed of a modified polyvinylidene fluoride / methacrylic resin, which includes the following raw materials in parts by weight: 70 parts of polyvinylidene fluoride, 18 parts of inorganic filler, 5 parts of colorant, 10 parts of methacrylic resin, 15 parts of acrylic resin, 0.8 parts of dispersant B, and 1.2 parts of ultraviolet absorber B.

[0087] The inorganic filler is titanium dioxide.

[0088] The colorant is a phthalocyanine series.

[0089] The dispersant B is Momentive A-1230 produced by Guangzhou Soman Trading Co., Ltd.

[0090] The ultraviolet absorber B is UV-2908 from Cytec Corporation of the United States.

[0091] The preparation method of the polyvinylidene fluoride / methacrylic acid resin modified material comprises the following steps: adding the raw materials of the above proportion into a mixer for mixing, mixing at a rotation speed of 600 rpm for 10 minutes, then mixing at 100 rpm for 5 minutes to obtain a mixture, and finally adding the mixture into a twin-screw extruder for extrusion granulation, homogenizing and drying to obtain the mixture.

[0092] In a preferred embodiment, the temperature of the twin-screw extruder is 190° C., the speed of the twin-screw extruder is 300 rpm, the vacuum degree is 0.8, and an underwater strip drawing method is used.

[0093] The adhesive layer 3 is composed of modified acrylic resin and methacrylic resin, and the modified acrylic resin and methacrylic resin include the following raw materials in parts by weight: 20 parts of methacrylic resin, 60 parts of acrylic resin, 13 parts of polyvinylidene fluoride, 1 part of antioxidant, 0.8 parts of anti-hydrolysis agent, and 1.2 parts of ultraviolet absorber C.

[0094] The anti-hydrolysis agent is the anti-hydrolysis agent K-1 produced by Beijia Fine Chemical Co., Ltd.

[0095] The ultraviolet absorber C is UV-1164 from Cytec Corporation of the United States.

[0096] The preparation method of the acrylic resin and methacrylic resin modified material comprises the following steps: firstly grinding the above raw materials, then adding them into a mixer according to the above ratio for mixing, first mixing at a rotation speed of 600 rpm for 8 minutes, then mixing at a rotation speed of 100 rpm for 20 minutes to obtain a mixture, and finally adding the mixture into a twin-screw extruder for extrusion granulation, homogenizing and drying to obtain the mixture.

[0097] In a preferred embodiment, the temperature of the twin-screw extruder is 160° C., the speed of the twin-screw extruder is 450 rpm, the vacuum degree is 0.8, an underwater stranding method is used, and a soft rubber pelletizer is adopted.

[0098] The polyvinylidene fluoride was purchased from Arkema, France as 1000HD.

[0099] The methacrylic resin was purchased as BS 203 from Arkema, France.

[0100] The acrylic resin was purchased from Acrylic K-355P of Rohm and Haas Company of the United States.

[0101] The above-mentioned method for preparing a multi-layer co-extruded outdoor weather-resistant film includes the following steps: adding polyvinylidene fluoride modified material, polyvinylidene fluoride / methacrylic resin modified material, acrylic resin and methacrylic resin modified material into three different extruders respectively, and then the melts coming out of the three different extruders are extruded through a collector, cooled and shaped, and the surface of the bonding layer 3 is then corona treated, trimmed, and rolled to obtain the film.

[0102] Performance Testing

[0103] The multi-layer co-extruded outdoor weather-resistant film obtained above was compared with commercially available ASA film, PET film and PVC film. The results are shown in the following table.

[0104] Table 1. Comparison of performance of Example 1, ASA film, PET film and PVC film

[0105]

[0106]

[0107] It can be seen from the above table that, compared with the existing ASA film, PET film and PVC film, the multi-layer co-extruded outdoor weather-resistant film of the present invention has better weather resistance, corrosion resistance and water vapor barrier properties.

[0108] The foregoing examples are merely illustrative and are used to explain some features of the present invention. The appended claims are intended to claim the widest possible range that can be conceived, and the embodiments presented herein are only illustrations of selected implementations according to the combination of all possible embodiments. Therefore, it is the applicant's intention that the appended claims are not limited by the selection of examples that illustrate the features of the present invention. Moreover, advances in science and technology will form possible equivalents or sub-replacements that are not currently considered due to inaccurate language expression, and these changes should also be interpreted as being covered by the appended claims where possible.

Claims

1. A multi-layer co-extruded outdoor weather-resistant film, characterized in that: From top to bottom, there are corrosion-resistant layer, functional color layer and bonding layer; the thickness of the corrosion-resistant layer is 5-15 μm; the thickness of the functional color layer is 5-40 μm; the thickness of the bonding layer is 5-18 μm; The corrosion-resistant layer is a planar structure; the functional color layer is a porous structure; the pore size of the porous structure is 0.1-0.3 μm; the bonding layer is a mesh structure; the mesh size of the mesh structure is 0.5-1 μm; The corrosion-resistant layer is composed of a modified polyvinylidene fluoride material, which includes the following raw materials in parts by weight: 70-90 parts of polyvinylidene fluoride, 0.1-2 parts of a nucleating agent, 0.1-2 parts of an ultraviolet absorber A, 0.1-2 parts of an antioxidant, 0.1-2 parts of a dispersant A, and 5-10 parts of a methacrylic resin; The functional color layer is composed of polyvinylidene fluoride / methacrylic resin modified material, which includes the following raw materials in parts by weight: 60-80 parts of polyvinylidene fluoride, 5-20 parts of inorganic filler, 1-10 parts of colorant, 5-15 parts of methacrylic resin, 10-20 parts of acrylic resin, 0.1-2 parts of dispersant B, and 0.1-2 parts of ultraviolet absorber B; The adhesive layer is composed of acrylic resin and methacrylic resin modified materials, and the acrylic resin and methacrylic resin modified materials include the following raw materials in parts by weight: 10-30 parts of methacrylic resin, 40-80 parts of acrylic resin, 5-20 parts of polyvinylidene fluoride, 0.1-2 parts of antioxidant, 0.1-2 parts of hydrolysis resistance agent, and 0.1-2 parts of ultraviolet absorber C; The molecular weight of the polyvinylidene fluoride is 300,000-500,000; the molecular weight of the methacrylic resin is 100,000-200,000; the molecular weight of the acrylic resin is 50,000-180,000; The ultraviolet absorber A is a hindered amine light stabilizer; the ultraviolet absorber B is a hindered phenol ultraviolet absorber; the ultraviolet absorber C is a triazine ultraviolet absorber; The dispersant A is hydroxylated ethylene bisstearamide; and the dispersant B is a silane dispersant.

2. The multi-layer co-extruded outdoor weather-resistant film according to claim 1, characterized in that: The antioxidant is a phosphite antioxidant.

3. The multi-layer co-extruded outdoor weather-resistant film according to claim 1, characterized in that: The inorganic filler is selected from one or more of titanium dioxide, calcium carbonate and talcum powder; the colorant is phthalocyanine series and / or azo series.

4. A method for preparing the multi-layer co-extruded outdoor weather-resistant film according to any one of claims 1 to 3, characterized in that: The method comprises the following steps: adding polyvinylidene fluoride modified material, polyvinylidene fluoride / methacrylic resin modified material, acrylic resin and methacrylic resin modified material into three different extruders respectively; then the melts from the three different extruders are extruded through a collector, cooled and shaped; and the surface of the bonding layer is subjected to corona treatment, trimmed and rolled to obtain the product.

Images