Functional layer coating, decorative film and method for producing the same

Abstract

This invention relates to the field of decorative materials and discloses a functional layer coating, comprising, by weight parts: 2 to 4 parts fluorosilicone resin, 1 to 2 parts organic wax, 20 to 30 parts polyurethane resin, 10 to 20 parts acrylate, 4 to 7 parts matting agent, 8 to 10 parts curing agent, and 40 to 50 parts solvent. It can prepare a film layer with high hardness and excellent scratch resistance.

Description

Technical Field

[0001] This application relates to the field of decorative materials, specifically to functional layer coatings, decorative films, and methods for their preparation. Background Technology

[0002] Polypropylene (PP) decorative film is an environmentally friendly decorative material widely used in the furniture and interior decoration industries, such as cabinets and wall decorations. However, as market demands for aesthetic quality in decorative films increase, existing films suffer from issues such as insufficient embossing accuracy and inadequate visual appeal due to substrate shrinkage and other factors.

[0003] It should be noted that the above statements are only used to provide background information related to this application and do not necessarily constitute prior art. Summary of the Invention

[0004] This application aims to at least partially solve the above-mentioned problems. In a first aspect, this application proposes a functional layer coating, comprising, by weight parts: 2 to 4 parts of fluorosilicone resin, 1 to 2 parts of organic wax, 20 to 30 parts of polyurethane resin, 10 to 20 parts of acrylate, 4 to 7 parts of matting agent, 8 to 10 parts of curing agent, and 40 to 50 parts of solvent.

[0005] In some embodiments, at least one of the following conditions is met: the fluorosilicone resin includes at least one of hydroxyl-terminated polytrifluoropropylmethylsiloxane, amino-terminated polytrifluoropropylmethylsiloxane, polyether-modified fluorosiloxane, fluorosilicone-modified hydroxyl acrylic resin, and polyester-modified hydroxyl-terminated fluorosiloxane; the surface tension of the fluorosilicone resin is 10 mN / m to 25 mN / m; the solid hydroxyl value of the fluorosilicone resin is 10 mg KOH / g to 30 mg KOH / g; and the solid hydroxyl value of the polyurethane resin is 60 mg KOH / g to 140 mg KOH / g.

[0006] In some embodiments, at least one of the following conditions is met: the organic wax has a melting point of 105°C to 140°C; the organic wax includes at least one of polyethylene wax, polypropylene wax, polyamide wax, and fluorinated wax.

[0007] In some embodiments, the matting agent comprises 1 to 2 parts of a porous matting agent and 3 to 5 parts of a reactive matting agent, wherein the porous matting agent comprises at least one of a silica porous matting agent, a polyacrylate porous matting agent, and a polyamide porous matting agent; and the reactive matting agent comprises at least one of a hydroxyl-modified silica matting agent, an amino-modified silica matting agent, an epoxy-modified silica matting agent, hydroxymethyl polyurea microspheres, hydroxyl-type acrylic microspheres, and hydroxyl-type polyurethane microspheres.

[0008] In some embodiments, at least one of the following conditions is met: the porous matting agent has a particle size of 1.5 μm to 3 μm; the porous matting agent has a pore volume of 0.6 mL / g to 1.5 mL / g; the reactive matting agent has a particle size of 1.5 μm to 6 μm; and the reactive matting agent has a solid hydroxyl value of 5 mg KOH / g to 15 mg KOH / g.

[0009] In a second aspect, this application provides a decorative film comprising: a polypropylene composite substrate, the polypropylene composite substrate comprising a polypropylene underlayer, an adhesive layer, and a cast polypropylene film top layer, wherein the adhesive layer is disposed on the side of the cast polypropylene film top layer facing the polypropylene underlayer; a functional layer, the functional layer being disposed on the side of the cast polypropylene film top layer away from the adhesive layer, the functional layer being prepared using the functional layer coating of this application; and a scratch-off layer, the scratch-off layer being disposed on the side of the functional layer away from the cast polypropylene film top layer.

[0010] In some embodiments, at least one of the following conditions is met: the thickness of the functional layer is 1 μm to 10 μm; the thickness of the cast polypropylene film surface layer is 20 μm to 100 μm; and the thickness of the adhesive layer is 1 μm to 10 μm.

[0011] In some embodiments, the adhesive layer includes at least one of polyurethane adhesive layer, acrylic adhesive layer, silicone adhesive layer, polyester adhesive layer, polyolefin adhesive layer, etc.

[0012] In some embodiments, the invention further includes an ink layer disposed on the side of the polypropylene substrate facing the adhesive layer, the ink layer having a thickness of 100 μm to 150 μm.

[0013] In a third aspect, this application proposes a method for preparing the decorative film of this application, comprising: applying a functional layer coating of this application to one side of a cast polypropylene film surface layer, performing a first curing treatment to prepare a functional layer, thereby obtaining a first composite film; applying an adhesive layer coating to the side of the first composite film away from the functional layer, performing a second curing treatment to prepare an adhesive layer, thereby obtaining a second composite film; performing a curing treatment on the second composite film to obtain a third composite film; and performing a bonding treatment, embossing treatment, and color scraping treatment on the third composite film and a polypropylene underlayer to prepare a color scraping layer, thereby obtaining the decorative film.

[0014] The beneficial effects of the technical solution proposed in this application include at least the following: The functional layer coating of this application, through resin system design, enables the preparation of coatings with a highly dense network structure. Furthermore, by filling the dense network with a matting agent in the form of stable chemical bonds, the coating prepared by the functional layer coating is strengthened and hardened. This improves the scratch resistance of the coating prepared by the functional layer coating and reduces direct physical damage. Detailed Implementation

[0015] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit this application; unless otherwise stated, the values ​​of the parameters mentioned in this application can be measured using various measurement methods commonly used in the art (e.g., they can be tested according to the methods given in the embodiments of this application).

[0016] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are open-ended expressions, meaning they include what is specified in this application but do not exclude other aspects.

[0017] In the description of this application, all figures disclosed herein, whether or not the words "approximately" or "about" are used, are approximate values. Each figure may vary by less than 10% or by a difference that is considered reasonable by one of the art, such as 1%, 2%, 3%, 4%, or 5%.

[0018] The "range" disclosed in this application is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60~120 and 80~110 are listed for a specific parameter, it is also expected that ranges of 60~110 and 80~120 are also included. Furthermore, if minimum range values ​​of 1 and 2 are listed, and if maximum range values ​​of 3, 4, and 5 are listed, then the following ranges are all expected: 1~3, 1~4, 1~5, 2~3, 2~4, and 2~5. In this application, unless otherwise stated, the numerical range "a~b" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0~5" indicates that all real numbers between "0~5" have been listed in this article; "0~5" is simply a shortened representation of these numerical combinations. Furthermore, when a parameter is stated as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0019] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0020] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0021] In a first aspect of this application, a functional layer coating is provided, comprising, by weight parts: 2 to 4 parts of fluorosilicone resin, 1 to 2 parts of organic wax, 20 to 30 parts of polyurethane resin, 10 to 20 parts of acrylate, 4 to 7 parts of matting agent, 8 to 10 parts of curing agent, and 40 to 50 parts of solvent.

[0022] The functional layer coating of this application contains the aforementioned components. Through the combined action of fluorosilicone resin, polyurethane resin, and acrylate, the functional layer coating can form a highly dense cross-linked network under the action of a curing agent. The fluorosilicone resin is relatively concentrated on the surface of the film during the functional layer coating molding process, effectively improving surface strength and resulting in good structural strength and surface hardness after molding. The gloss is controlled by a matting agent, and the composite of organic waxes helps the components in the functional layer coating react to form discontinuous, dispersed microcrystalline sub-films, giving the film prepared by the functional layer coating good recoatability. Therefore, this functional layer coating is suitable for decorative films that require three-dimensional embossing and pattern preparation through scratch-off color processing. It helps improve the stability of the three-dimensional decorative patterns on the decorative film, reduces rebound after embossing, and results in sharp edges and controllable depth of the three-dimensional embossing. The film prepared by this functional layer coating has good scratch resistance and is well-suited for decorative film processes such as scratch-off color processing.

[0023] In some embodiments, the fluorosilicone resin includes at least one of hydroxyl-terminated polytrifluoropropylmethylsiloxane, amino-terminated polytrifluoropropylmethylsiloxane, polyether-modified fluorosiloxane, fluorosilicone-modified hydroxyl acrylic resin, and polyester-modified hydroxyl-terminated fluorosiloxane; the surface tension of the fluorosilicone resin is 10 mN / m to 25 mN / m; and the solid hydroxyl value of the fluorosilicone resin is 10 mg KOH / g to 30 mg KOH / g. Using a fluoropolymer resin that meets the foregoing requirements as a component is beneficial for reducing the surface tension and surface friction coefficient after the functional layer coating is formed. This improves surface stain resistance and, according to F... f =μ FN, tangential destructive friction force F f The proportion is significantly reduced, which is beneficial to improving the scratch resistance of the functional layer prepared by this functional layer coating.

[0024] In some embodiments, the polyurethane resin comprises a self-healing polyurethane resin. The self-healing polyurethane resin comprises a non-covalent intrinsic self-healing resin, including modified urea groups, urethane groups, and other strong hydrogen bond donors / acceptors, which can form multiple hydrogen bond crosslinking points to achieve a room-temperature, second-level self-healing effect.

[0025] In some embodiments, the solid hydroxyl value of the polyurethane resin is 60 mg KOH / g to 140 mg KOH / g. This facilitates the formation of a dense cross-linked network within the functional layer coating during molding, thereby improving the structural strength of the prepared film.

[0026] In some embodiments, at least one of the following conditions is met: the organic wax has a melting point of 105°C to 140°C; the organic wax includes at least one of polyethylene wax, polypropylene wax, polyamide wax, and fluorinated wax. The use of an organic wax that meets the aforementioned conditions ensures that the surface of the formed film in the functional layer coating has good processability, which is beneficial for the organic wax to provide continuous phase anchoring in the functional layer coating and reduces its impact on the surface of the film formed by the functional layer coating. This, in turn, helps to improve the surface hardness of the functional layer prepared by the functional layer coating.

[0027] In some embodiments, the curing agent comprises an isocyanate curing agent, and the NCO / OH ratio in the functional layer coating ranges from 1.05 to 1.20. This facilitates efficient curing of the functional layer coating and the formation of a dense cross-linked network.

[0028] In some embodiments, the matting agent comprises 1 to 2 parts of a porous matting agent and 3 to 5 parts of a reactive matting agent. The porous matting agent comprises at least one of a silica porous matting agent, a polyacrylate porous matting agent, and a polyamide porous matting agent. The reactive matting agent comprises at least one of a hydroxyl-modified silica matting agent, an amino-modified silica matting agent, an epoxy-modified silica matting agent, hydroxymethyl polyurea microspheres, hydroxyl-type acrylic microspheres, and hydroxyl-type polyurethane microspheres. This facilitates better matting effects in functional layer coatings, reduces the impact on the stain resistance of the functional layer, and improves the scratch resistance of the coating.

[0029] In some embodiments, the porous matting agent has a particle size of 1.5 μm to 3 μm and a pore volume of 0.6 mL / g to 1.5 mL / g. Therefore, the porous matting agent can achieve a better matting effect and reduce its impact on the stain resistance and scratch resistance of the functional layer.

[0030] In some embodiments, the particle size of the reactive matting agent is 1.5 μm to 6 μm; the solid hydroxyl value of the reactive matting agent is 5 mg KOH / g to 15 mg KOH / g. Meeting the aforementioned range is beneficial for maximizing the matting ability of the reactive matting agent and for its dispersion in the functional layer coating. During the curing of the functional layer coating, it participates in the reaction by stabilizing chemical bonds, reducing the formation of heterogeneous weak interfaces in the functional layer coating. This significantly enhances the coating's hardness, strength, and scratch resistance.

[0031] In a second aspect, this application provides a decorative film comprising: a polypropylene composite substrate, the polypropylene composite substrate comprising a polypropylene underlayer, an adhesive layer, and a cast polypropylene film top layer, wherein the adhesive layer is disposed on the side of the cast polypropylene film top layer facing the polypropylene underlayer; a functional layer, the functional layer being disposed on the side of the cast polypropylene film top layer away from the adhesive layer, the functional layer being prepared using the functional layer coating of this application; and a scratch-off layer, the scratch-off layer being disposed on the side of the functional layer away from the cast polypropylene film top layer.

[0032] The decorative film of this application includes a polypropylene composite substrate as a structural support, providing high structural strength. Each layer of the polypropylene composite substrate possesses excellent thermoplasticity, and the interlayer interfaces are relatively stable. This helps reduce errors caused by material shrinkage and deformation of the decorative pattern in the multi-layer structure after processes such as embossing and color-applying treatments for three-dimensional decorative patterns. The functional layer prepared using the functional coating of this application has high abrasion resistance and a superior matte visual effect, which helps the applied color layer to present complete and full colors. Therefore, it improves the surface scratch resistance and aesthetics of the decorative film, effectively showcasing the decorative patterns on the film and possessing high visual appeal. The decorative film has advantages such as realistic texture, stain resistance, scratch resistance, solvent resistance, and good adhesion.

[0033] In some embodiments, the thickness of the functional layer is 1 μm to 10 μm. This facilitates effective stress dispersion of the functional layer when subjected to external stress, reducing problems such as adhesion and deformation during the fabrication process.

[0034] In some embodiments, the thickness of the cast polypropylene film surface layer is 20 μm to 100 μm. This is beneficial for improving the structural strength of the cast polypropylene film surface layer, adjusting the peel strength between the cast polypropylene film surface layer and the polypropylene substrate, and facilitating the setting of specific colors on the polypropylene substrate, thereby improving the color accuracy and clarity of the decorative film.

[0035] In some embodiments, the thickness of the adhesive layer is 1 μm to 10 μm. This helps to reduce problems such as adhesive layer peeling and re-adhesion.

[0036] In some embodiments, at least one of the following conditions is met: the adhesive layer includes at least one of a polyurethane adhesive layer, an acrylic adhesive layer, a silicone adhesive layer, a polyester adhesive layer, and a polyolefin adhesive layer. The aforementioned materials exhibit good adhesion and bonding effects with polypropylene-based membrane materials.

[0037] In some embodiments, the method further includes an ink layer disposed on the side of the polypropylene underlayer facing the adhesive layer, the ink layer having a thickness of 100μm to 150μm. Thus, the aforementioned ink layer can provide different base colors for the decorative film, which is beneficial for displaying patterns on the colored layer and can adapt to the thickness requirements of different decorative films.

[0038] In a third aspect, this application proposes a method for preparing the decorative film of this application, comprising: applying a functional layer coating of this application to one side of a cast polypropylene film surface layer, performing a first curing treatment to prepare a functional layer, thereby obtaining a first composite film; applying an adhesive layer coating to the side of the first composite film away from the functional layer, performing a second curing treatment to prepare an adhesive layer, thereby obtaining a second composite film; performing a curing treatment on the second composite film to obtain a third composite film; and performing a bonding treatment, embossing treatment, and color scraping treatment on the third composite film and a polypropylene underlayer to prepare a color scraping layer, thereby obtaining the decorative film.

[0039] This method involves preparing a functional layer on the surface of a cast polypropylene film using the functional layer coating of this application. After a first curing treatment and subsequent aging treatment, the fluorosilicone resin in the functional layer coating migrates to the surface of the functional layer, forming a relatively dense cross-linked network. This significantly improves the scratch and stain resistance of the functional layer. Embossing and color-scraping processes create a three-dimensional decorative pattern on the decorative film, while the color-scraping layer forms a color expression including lines or color blocks. The process of embossing before applying the color-scraping layer ensures accurate pattern matching. Thus, a decorative film with a three-dimensional, clear, and accurate decorative pattern is prepared.

[0040] In some embodiments, the temperature of the first curing process is 85°C to 90°C.

[0041] In some embodiments, the temperature of the second curing process is 85°C to 90°C.

[0042] In some embodiments, the aging process is carried out at a temperature of 45°C to 55°C.

[0043] In some embodiments, the bonding process is performed at a temperature of 130°C to 140°C.

[0044] In some embodiments, the ink curing temperature for the coloring treatment is 40°C to 50°C.

[0045] In some embodiments, the ink used for the scraping process includes solvent-based polyurethane ink, acrylic ink, polyamide ink, etc.

[0046] In some embodiments, the thickness of the scratched color layer accounts for 5% to 20% of the embossing depth; preferably, 10% to 15%.

[0047] In some embodiments, the embossing depth is 20% to 50% of the thickness of the decorative film, preferably 30% to 40%.

[0048] The following specific embodiments illustrate the solution of this application. It should be noted that these embodiments are for illustrative purposes only and should not be considered as limiting the scope of this application. Where specific techniques or conditions are not specified in the embodiments, they are performed according to the techniques or conditions described in the literature in this field or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be obtained commercially.

[0049] Example 1 The functional layer coating, by weight, comprises: 30 parts intrinsic self-healing polyurethane resin (Ningbo Funa New Material Technology Co., Ltd., FNRG-0331), 10 parts acrylate (Hypomer MT-2350), 3 parts fluorosilicone resin (Dow Chemical, DOWSIL™ FS-8381 Fluid), 1.5 parts polyamide organic wax (Nanjing Tianshi New Material Technology Co., Ltd., NEW-0451), 1.5 parts porous amorphous matting agent (Tosoh SILICA Co., Ltd., E-1011), 4.0 parts reactive spherical matting agent (Dongguan Xinhua New Material, K5), 9 parts curing agent (Wanhua Chemical Group Co., Ltd., HB-75B), 1 part other additives, and 45 parts ethyl acetate solvent.

[0050] Example 1 provides a decorative film, which includes, from top to bottom: a polyurethane scratch-off layer (5 μm thick), a functional layer (5 μm thick), a cast polypropylene film surface layer (40 μm thick), a polyurethane adhesive layer (1 μm thick), and a polypropylene underlayer (120 μm thick).

[0051] The method for preparing decorative films includes the following steps: (1) Apply the functional layer coating to one side of the cast polypropylene film surface layer and perform a first curing treatment at 85°C for 60 seconds. (2) Apply the adhesive layer to the other side of the cast polypropylene film surface and perform a second curing treatment at 75°C for 60 seconds; (3) The cast polypropylene film with double-sided coating is cured at 45°C for 24 hours; (4) After curing, the adhesive side of the cast polypropylene film surface layer and the ink side of the PP bottom layer are bonded at 140°C for 15s, embossed, with an embossing depth of 40μm ~ 60μm, coated with scraping ink, scraped with a rubber scraper, and cured at 45°C for 30s to obtain the decorative film.

[0052] Example 2 Example 2 is consistent with Example 1, except that the functional layer coating includes: 30 parts self-healing polyurethane resin, 10 parts acrylate, 2 parts fluorosilicone resin, 2 parts polyamide organic wax, 1.5 parts porous amorphous matting agent, 4.0 parts reactive spherical matting agent, 9 parts curing agent, 1 part other additives, and 45 parts solvent.

[0053] Example 3 Example 3 is consistent with Example 1, except that the functional layer coating includes: 30 parts self-healing polyurethane resin, 10 parts acrylate, 4 parts fluorosilicone resin, 1 part polyamide organic wax, 1.5 parts porous amorphous matting agent, 4.0 parts reactive spherical matting agent, 9 parts curing agent, 1 part other additives, and 45 parts solvent.

[0054] Comparative Example 1 Comparative Example 1 is the same as Example 1, except that no polyamide (organic wax Nanjing Tianshi New Material Technology Co., Ltd., NEW-0451) was added.

[0055] Comparative Example 2 Comparative Example 2 is the same as Example 1, except that the polyamide organic wax (organic wax Nanjing Tianshi New Material Technology Co., Ltd., NEW-0451) was replaced with high melting point polypropylene wax (organic wax Nanjing Tianshi New Material Technology Co., Ltd., PPW-0911).

[0056] Comparative Example 3 Comparative Example 3 is the same as Example 1, except that the polyamide organic wax is replaced with low melting point polyethylene organic wax (organic wax Nanjing Tianshi New Material Technology Co., Ltd., TS-5209).

[0057] Test results: See Table 1.

[0058] Table 1

[0059] Test method: 1. Stain resistance / grade test: GB / T 17657-2022 2. Adhesion / Grade Test: GB / T 9286-1998 3. Gloss test: GB / T 8941-2007 4. Self-healing performance test: Scratches are left on the nail, and a 50℃ hot compress is applied for 60 seconds.

[0060] 5. Scratch resistance test: GB / T 17657-2022 6. Solvent resistance test: GB / T 23989-2009 7. Flexibility test: Observe the decorative film after folding it 180°. 8. Elongation at break test: GB / T 1040.3-2006 In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. "First feature" and "second feature" may include one or more of the indicated feature.

[0061] In this application, the order in which the steps are written does not imply a strict execution order and does not limit the implementation process. The specific execution order of each step should be determined by its function and possible internal logic. Unless otherwise specified, all steps in this application can be performed sequentially or randomly, preferably sequentially. For example, if the method includes steps (a) and (b), it means that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, if the method may also include step (c), it means that step (c) can be added to the method in any order. For example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0062] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A functional layer coating, characterized in that, By weight, it includes: 2 to 4 parts fluorosilicone resin, 1 to 2 parts organic wax, 20 to 30 parts polyurethane resin, 10 to 20 parts acrylate, 4 to 7 parts matting agent, 8 to 10 parts curing agent, and 40 to 50 parts solvent.

2. The functional layer coating according to claim 1, characterized in that, At least one of the following conditions must be met: The fluorosilicone resin includes at least one of the following: hydroxyl-terminated polytrifluoropropylmethylsiloxane, amino-terminated polytrifluoropropylmethylsiloxane, polyether-modified fluorosiloxane, fluorosilicone-modified hydroxyl acrylic resin, and polyester-modified hydroxyl-terminated fluorosiloxane. The surface tension of the fluorosilicone resin is 10 mN / m to 25 mN / m; The solid hydroxyl value of the fluorosilicone resin is 10 mg KOH / g to 30 mg KOH / g; The solid hydroxyl value of the polyurethane resin is 60 mg KOH / g to 140 mg KOH / g.

3. The functional layer coating according to claim 1, characterized in that, At least one of the following conditions must be met: The organic wax has a melting point of 105℃~140℃; The organic wax includes at least one of polyethylene wax, polypropylene wax, polyamide wax, and fluorinated wax.

4. The functional layer coating according to any one of claims 1 to 3, characterized in that, The matting agent comprises 1 to 2 parts of a porous matting agent and 3 to 5 parts of a reactive matting agent, wherein, The porous matting agent includes at least one of silica porous matting agent, polyacrylate porous matting agent, and polyamide porous matting agent; The reactive matting agent includes at least one of hydroxyl-modified silica matting agent, amino-modified silica matting agent, epoxy-modified silica matting agent, hydroxymethyl polyurea microspheres, hydroxyl-type acrylic microspheres, and hydroxyl-type polyurethane microspheres.

5. The functional layer coating according to claim 4, characterized in that, At least one of the following conditions must be met: The porous matting agent has a particle size of 1.5 μm to 3 μm; The porous matting agent has a pore volume of 0.6 mL / g to 1.5 mL / g; The particle size of the reactive matting agent is 1.5 μm to 6 μm; The solid hydroxyl value of the reaction matting agent is 5 mg KOH / g to 15 mg KOH / g.

6. A decorative film, characterized in that, include: A polypropylene composite substrate, comprising a polypropylene underlayer, an adhesive layer, and a cast polypropylene film surface layer, wherein the adhesive layer is disposed on the side of the cast polypropylene film surface layer facing the polypropylene underlayer; A functional layer is disposed on the side of the cast polypropylene film surface layer away from the adhesive layer, and the functional layer is prepared using the functional layer coating according to any one of claims 1 to 5; A scratch-off layer is disposed on the side of the functional layer away from the surface layer of the cast polypropylene film.

7. The decorative film according to claim 6, characterized in that, At least one of the following conditions must be met: The thickness of the functional layer is 1μm~10μm; The thickness of the cast polypropylene film surface layer is 20μm~100μm; The thickness of the adhesive layer is 1μm to 10μm.

8. The decorative film according to claim 6, characterized in that, The adhesive layer includes at least one of the following: polyurethane adhesive layer, acrylic adhesive layer, silicone adhesive layer, polyester adhesive layer, and polyolefin adhesive layer.

9. The decorative film according to any one of claims 6 to 8, characterized in that, Also includes: An ink layer is disposed on the side of the polypropylene underlayer facing the adhesive layer, and the thickness of the ink layer is 100μm~150μm.

10. A method for preparing the decorative film according to any one of claims 6 to 9, characterized in that, include: The functional layer coating according to any one of claims 1 to 5 is applied to one side of the cast polypropylene film surface layer, and a first curing treatment is performed to prepare the functional layer, thereby obtaining a first composite film. An adhesive coating is applied to the side of the first composite film away from the functional layer, and a second curing process is performed to prepare the adhesive layer, thereby obtaining the second composite film. The second composite membrane is subjected to a aging treatment to obtain a third composite membrane; The third composite film is bonded to the polypropylene substrate, embossed, and scratched to prepare a scratched layer, thus obtaining the decorative film.

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