UV resin composition for reflective film and reflective film

Abstract

According to the UV resin composition for the reflective film and the reflective film, by optimizing a resin formula and a preparation process, the surface tension of the reflective film and the peel strength of an aluminized layer are improved, and meanwhile excellent weather resistance and optical performance are kept. The composition contains the carboxyl and hydroxyl oligomer, the reactive diluent, the flatting agent, the photoinitiator, the adhesion promoter and other components, all the components have a synergistic effect, the interaction force with a metal layer is enhanced, the stability of a coating is improved, the oligomer contains carboxyl and hydroxyl at the same time, the adhesion between the coating and the metal layer can be enhanced, and the peel strength is improved. The UV resin composition is simple in preparation process and beneficial to large-scale industrial production. The reflective film prepared from the composition has excellent optical properties and physical properties, such as high reflective rate, wide visual angle reflection, good weather resistance, chemical resistance and high peel strength, and is suitable for application requirements of high-performance reflective films.

Description

Technical Field

[0001] The present application relates to the technical field of functional resins, and in particular to a UV resin composition for a reflective film and the reflective film. Background Art

[0002] As the global trend toward utilizing solar energy to replace traditional fossil fuels continues, the photovoltaic industry is striving to continuously increase the power generation capacity of photovoltaic modules, aiming to reduce dependence on non-renewable energy sources like oil and coal, and mitigate environmental pollution and ecological damage. As the core of this field, improving the efficiency of solar photovoltaic power generation technology has become a key research focus. Photovoltaic interstitial reflective film, an innovative component material, has emerged in this context. It reflects sunlight that hits inactive interstitial areas, such as conductors, back onto photovoltaic panels, increasing the amount of light received by the panels. Research has shown that this technology can increase sunlight reflectivity by 10%, thereby directing more sunlight into the cells, effectively improving the power output and photoelectric conversion efficiency of the entire photovoltaic module, significantly enhancing the efficiency and stability of solar power generation.

[0003] Commercially available reflective sheeting typically consists of a polymer film base layer and a microstructured reflective layer. The film base is typically made of materials such as PET (polyethylene terephthalate), PMMA (polymethyl methacrylate), and PC (polycarbonate), which are widely used for their excellent physical properties and light transmittance. The reflective layer is designed with a multi-layered reflective microstructure, including a prismatic structure with a specific vertex angle range and a metallic reflective layer on its surface. The prismatic layer is made of UV-resistant resin with a triangular cross-section, effectively guiding and reflecting light. The aluminum-plated layer overlays the prismatic layer, further enhancing light utilization through its high reflectivity. This structural design allows the reflective sheeting to efficiently reflect sunlight according to the angle of the sun at different times of day, significantly improving battery efficiency.

[0004] However, despite some progress in existing reflective sheeting technology, challenges remain. In particular, the surface energy difference between the UV resin coating and the aluminum layer results in weak peel strength between the two. This peeling problem is particularly prominent in long-term outdoor exposure. The detachment of the aluminum layer not only affects the reflective effect but also significantly reduces the efficiency and service life of the reflective sheeting. Therefore, strengthening the bond between the UV resin coating and the aluminum layer to prevent the aluminum layer from detaching has become a current technical challenge. Summary of the Invention

[0005] The purpose of the present application is to provide a UV resin composition for reflective film, which has a higher surface tension and can achieve a higher level of peel strength between the aluminum-plated layer and the UV resin coating formed therefrom. The UV resin composition for reflective film of the present application includes the following components in parts by weight: 5~35 parts of oligomer 20~80 parts of active diluent 0.2~1.3 parts of leveling agent 2~10 parts adhesion promoter 2~7 parts of photoinitiator; Wherein, the oligomer contains a carboxyl group.

[0006] In one embodiment, the oligomer further contains a hydroxyl group.

[0007] In one embodiment, the reactive diluent contains a carboxyl group.

[0008] In one embodiment, the active diluent is one or more of hydroxyethyl acrylate (HEA), hydroxyethyl methacrylate (HEMA), hydroxypropyl methacrylate (HPMA), 2-carboxyethyl acrylate (CEA), polyethylene glycol (6) acrylate, polyethylene glycol (11) acrylate, polyethylene glycol (6) methacrylate, polyethylene glycol (11) methacrylate, caprolactone acrylate (CA), pentaerythritol triacrylate (PETA), 2-hydroxy-3-phenoxy-propyl acrylate and hydroxypivalic acid polyethylene glycol diacrylate (HPNDA).

[0009] In one embodiment, the leveling agent is one or two of a silicone leveling agent, an acrylate leveling agent, and a fluorocarbon leveling agent.

[0010] In one embodiment, the photoinitiator is one or more of 1-hydroxy-cyclohexanone benzophenone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, and 2-hydroxy-2-toluene-phenylacetone-1.

[0011] In one embodiment, the adhesion promoter is a resin containing a carboxyl group.

[0012] In addition, the present application also provides a reflective film, comprising a film substrate layer, a UV resin layer and a metal reflective layer, wherein the UV resin layer is made of the aforementioned UV resin composition for reflective film.

[0013] In one embodiment, the UV resin layer is a prismatic microstructure, and the prismatic microstructure includes a plurality of prisms arranged in parallel, and the cross section of the prism is triangular.

[0014] In one embodiment, the surface of the UV resin layer is treated to be hydrophilic.

[0015] Compared with the prior art, this application has the following beneficial effects: The UV resin composition of this application incorporates oligomers containing carboxyl and hydroxyl groups and a reactive diluent, forming hydrogen bonds with the aluminum coating. The carboxyl groups also form complexes with surface metal atoms or ions through their micro-corrosion of the metal layer. As a highly polar functional group, the carboxyl groups not only enhance the polarity of the resin coating but also promote interaction between the resin coating and the aluminum layer, thereby significantly improving the adhesion between the coating and the metal. Reflective sheeting produced using this UV resin composition significantly improves the peel strength between the aluminum coating and the UV resin layer, ensuring the stability and durability of the reflective sheeting during long-term outdoor use. This polarity-matching design ensures excellent adhesion under a variety of environmental conditions, effectively preventing the aluminum layer from peeling off.

[0016] The reflective film produced using the UV resin composition of the present invention exhibits excellent reflective and adhesive properties. Its prismatic microstructure efficiently reflects sunlight onto photovoltaic panels, increasing the amount of light received by the panels, thereby improving the power output and photoelectric conversion efficiency of photovoltaic modules. This is of great significance for enhancing the efficiency and stability of solar power generation. The flexible formulation design adapts to various application scenarios. The UV resin composition offers a variety of optional raw material combinations, such as oligomers, reactive diluents, leveling agents, photoinitiators, and adhesion promoters. The selection and proportioning of these raw materials can be adjusted according to the needs of specific application scenarios to meet the performance requirements of different reflective film products. The preparation method is simple and efficient, not only reducing production costs but also improving production efficiency, facilitating large-scale industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the reflective film in the embodiment of the present application.

[0018] Description of reference numerals: 100, film substrate layer; 200, UV resin layer; 300, metal reflective layer. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It will be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some, rather than all, structures related to the present application are shown in the accompanying drawings. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0020] As used herein, the terms "comprise," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0021] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0022] Due to the large difference in surface energy between the resin coating and the aluminum coating, the peel strength between the aluminum coating and the UV resin coating is usually low. Moreover, since the reflective film needs to be exposed to outdoor environments for a long time, the shedding of the aluminum layer is the most common problem, which ultimately leads to a significant reduction in its efficiency. The present application develops a new UV resin composition for reflective film. By optimizing the resin formula and preparation process, the surface tension of the reflective film and the peel strength of the aluminum coating are improved while maintaining excellent weather resistance and optical properties. The UV resin composition comprises components such as oligomers containing carboxyl and hydroxyl groups, reactive diluents, leveling agents, photoinitiators, and adhesion promoters. The synergistic effect between the components not only enhances the interaction between the resin and the metal layer, but also improves the overall performance of the coating. Specifically, it includes the following components in parts by weight: 5~35 parts of oligomer 20~80 parts of active diluent 0.2~1.3 parts of leveling agent 2~10 parts adhesion promoter 2~7 parts of photoinitiator; Wherein, the oligomer contains a carboxyl group.

[0023] The oligomer serves as the backbone of the resin system, providing the coating with the necessary strength and toughness. Furthermore, the oligomer contains carboxyl groups, which play a dual role: on the one hand, they can produce a slight corrosive effect on the metal layer (such as the aluminum-plated layer). This micro-corrosion helps the oligomer molecules to form chemical bonds or complexes with the atoms or ions on the metal surface, thereby enhancing the physical bonding force, i.e., adhesion, between the coating and the metal layer. On the other hand, the introduction of the carboxyl group, a highly polar functional group, can significantly enhance the overall polarity of the resin coating, thereby making the interaction between the resin coating and the aluminum layer closer, thereby exhibiting higher peel strength in the peel test.

[0024] Reactive diluents, as solvents or diluents in resin systems, not only help adjust the resin's viscosity and facilitate coating operations, but some also contain polar functional groups such as carboxyl or hydroxyl groups. These functional groups can interact with functional groups in oligomers, further enhancing the resin system's cohesion and adhesion to the metal layer. Leveling agents are crucial for improving the coating's surface smoothness and reducing pinholes and orange peel. By adjusting the type and dosage of leveling agents, the coating's appearance can be optimized, resulting in a smoother and more uniform finish. Adhesion promoters further promote chemical bonding or physical adsorption between the resin coating and the metal layer, thereby enhancing the adhesion between the coating and the substrate. This effect is particularly pronounced when the adhesion promoter also contains polar functional groups such as carboxyl groups. Photoinitiators rapidly decompose under ultraviolet light to produce free radicals or ions, which trigger crosslinking reactions within the resin molecules and form a stable network structure. By selecting the appropriate photoinitiator and adjusting its dosage, the curing speed and degree of the resin can be optimized, ensuring the coating possesses excellent physical properties and chemical stability.

[0025] By introducing carboxyl-containing oligomers, this UV resin composition enhances the adhesion between the coating and the metal layer, thereby improving peel strength and meeting the application requirements of high-performance reflective film. Furthermore, the UV resin composition has a simple preparation process and a fast curing speed, making it suitable for large-scale industrial production and reducing production costs.

[0026] Specifically, the oligomer also contains hydroxyl groups. In a further technical solution, the oligomer contains both carboxyl (-COOH) and hydroxyl (-OH) functional groups. The carboxyl group, with its high polarity and micro-corrosive effect on the metal layer, enhances the adhesion between the resin coating and the metal (such as the aluminum coating), improving the peel strength. The hydroxyl group, a similarly polar functional group, not only further increases the polarity of the resin system and strengthens its interaction with the metal layer, but also imparts a certain self-crosslinking ability to the oligomer. During the UV curing process, the hydroxyl group can react with other functional groups in the system (such as carboxyl and isocyanate) to form chemical bonds, thereby building a tighter and more stable network structure. The dual effects of the carboxyl and hydroxyl groups form a stronger chemical bond between the oligomer and the metal layer, significantly improving the cohesion and adhesion between the coating and the substrate. This not only improves the peel strength of the reflective film but also enhances its resistance to scratches and abrasions. The self-crosslinking ability of hydroxyl groups enables the resin system to form a denser network structure during UV light curing, reducing shrinkage and porosity after curing, thereby improving the hardness and wear resistance of the coating. The introduction of hydroxyl groups also helps to regulate the curing speed of the resin system, making the curing process more controllable.

[0027] Specifically, the reactive diluent contains a carboxyl group. The inclusion of the carboxyl group in the chemical structure of the reactive diluent not only enables the reactive diluent to maintain good fluidity and the ability to participate in the UV curing reaction, but also gives the diluent additional chemical activity, enabling it to react with other functional groups in the system (such as hydroxyl groups, amino groups, etc.), promoting the formation of a broader and deeper cross-linked network. The carboxyl group can chemically react with other functional groups in the system to form chemical bonds, thereby constructing a tighter and more stable cross-linked network. The carboxyl group has a certain polarity and can form hydrogen bonds or chemical bonds with the surfaces of various substrates, thereby improving the adhesion between the cured product and the substrate.

[0028] Specifically, the active diluent is one or more of hydroxyethyl acrylate (HEA), hydroxyethyl methacrylate (HEMA), hydroxypropyl methacrylate (HPMA), 2-carboxyethyl acrylate (CEA), polyethylene glycol (6) acrylate, polyethylene glycol (11) acrylate, polyethylene glycol (6) methacrylate, polyethylene glycol (11) methacrylate, caprolactone acrylate (CA), pentaerythritol triacrylate (PETA), 2-hydroxy-3-phenoxy-propyl acrylate and hydroxypivalic acid polyglycol diacrylate (HPNDA). The leveling agent is one or two of an organic silicone leveling agent, an acrylate leveling agent and a fluorocarbon leveling agent. The photoinitiator is one or more of 1-hydroxy-cyclohexanone benzophenone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide and 2-hydroxy-2-toluene-phenylacetone-1. The adhesion promoter is a resin containing a carboxyl group.

[0029] The oligomer should be a carboxyl-containing material, encompassing at least one of polyurethane acrylates, epoxy acrylates, and polyester acrylates. Specific product models include Sartomer SB 404, Cytec EB 770, Changxing 648, and Changxing 649. Leveling agents are preferably silicone, acrylate, or fluorocarbon leveling agents, or a combination thereof, to achieve optimal surface leveling. Specific models include BYK 310, BYK 306, BYK 333, and BYK 337. Photoinitiators are preferably highly efficient and stable, such as 1-hydroxy-cyclohexanone benzophenone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, and 2-hydroxy-2-methylphenylacetone-1. Specifically, IGM 184, IGM TPO, and IGM 1173 are preferred. Adhesion promoters can include carboxyl resins, carboxyl acrylates, acrylated phosphates, and siloxane coupling agents to further enhance the bond between the coating and the substrate. Preferred products include Sartomer CD 9050, Sartomer CD 9051, Corning Photomer 4713, Cytec EB 170, and Cytec EB 168, which can improve the adhesion and durability of the coating on various substrates. This optimized selection ensures the effective synergy of the various components in the formulation, thereby improving overall performance and meeting the needs of different application scenarios.

[0030] The specific steps of the UV resin preparation method of the present application are as follows: First, the selected raw materials are added to the stirring tank one by one in order. First, the oligomer is added as the skeleton structure of the resin, which provides the main properties of the cured product. Then the adhesion promoter, active diluent monomer, leveling agent, and photoinitiator are added in sequence. After all the raw materials are added, the stirring operation is started. At the same time, in order to accelerate the dissolution and mixing of the raw materials and promote the dispersion of the photoinitiator, the stirring tank is heated to 45 to 50°C. This temperature range can ensure that the raw materials are fully dissolved and mixed without causing unnecessary side reactions. Stir for 180 minutes while maintaining a constant temperature and stirring to ensure that all components are fully reacted and evenly dispersed.

[0031] The key to improving the peel strength between the UV resin coating and the aluminum layer lies in enhancing the adhesion between the coating and the aluminum layer. In the resin coating formula, carefully selected oligomers and reactive diluents can form hydrogen bonds with the surface of the aluminum layer, which is an important way to improve the peel strength. It is particularly worth mentioning that oligomers and reactive diluents containing carboxyl (-COOH) and hydroxyl (-OH) functional groups perform better in this regard. The carboxyl group, due to its unique chemical properties, can produce a slight chemical corrosion effect on the surface of the aluminum layer, and then form a stable complex with the atoms or ions on the metal surface. This chemical bonding action strengthens the bonding force between the coating and the aluminum layer, thereby significantly improving the peel strength. In addition, as a highly polar functional group, the introduction of the carboxyl group can significantly increase the polarity of the resin coating, thereby enhancing the interaction between the coating and the aluminum layer and further improving the peel strength.

[0032] The present application also provides a reflective sheeting comprising a film substrate layer 100, a UV resin layer 200, and a metal reflective layer 300. The UV resin layer 200 is made from the aforementioned UV resin composition for reflective sheeting. In use, the aforementioned coating formulation is first applied to an optical film via a photocuring transfer process to form a prism array coating. The coating is then vacuum-plated with an aluminum layer to produce a finished photovoltaic interstitial reflective sheeting.

[0033] As can be seen from the foregoing, the UV resin composition of the present application has been optimized to enhance adhesion to the metal reflective layer 300, thereby ensuring that the reflective film maintains excellent peel strength during long-term use. During the specific production process, the prepared UV resin coating formula is first applied to the optical surface of the film substrate layer 100 using a coating device using a photocuring transfer process. In this step, the application of the photocuring transfer process ensures the accuracy and uniformity of the prism array coating. Subsequently, a layer of metallic aluminum is evenly plated on the prism array coating using vacuum aluminum plating technology to form the metallic reflective layer 300. The uniform thickness of the aluminum plating layer also ensures a close bond with the UV resin layer 200, achieving optimal reflective effect and peel strength. After the above steps, the finished photovoltaic interstitial reflective film is obtained, which exhibits excellent optical properties such as high reflectivity and wide viewing angle reflection, as well as outstanding physical properties such as good weather resistance, chemical resistance, and high peel strength.

[0034] Specifically, the UV resin layer 200 is a prismatic microstructure comprising a plurality of parallel prisms with a triangular cross-section. This geometric shape is chosen to maximize the efficiency of light refraction and reflection. The isosceles triangle cross-section ensures uniform and efficient refraction and reflection of light at the prism interface, thereby effectively improving the brightness and uniformity of the reflective film. Preferably, the vertex angle of the isosceles triangle is within the range of 90°-150°, preferably 120°. A light-curing transfer process is employed to ensure that the UV resin layer 200 maintains a highly precise prism shape during the curing process, while achieving a close fit with the film substrate layer 100.

[0035] Specifically, the surface of the UV resin layer 200 undergoes a hydrophilic treatment using plasma technology to further enhance its surface properties, particularly its wettability and adhesion. During the hydrophilic treatment, the surface of the UV resin layer 200 reacts with the plasma, further increasing the proportion of surface hydrogen bonds, thereby increasing polarity and further optimizing surface properties. The hydrophilic treatment can be performed after the UV resin layer 200 has been formed and cured. By controlling plasma treatment parameters such as the gas (hydrogen) flow rate, treatment time, and plasma power, the desired wettability and adhesion of the UV resin layer 200 can be achieved while maintaining its original optical properties and physical stability. The rearranged chemical bonds and increased polarity of the hydrophilic treated UV resin layer 200 allow for tighter and more uniform adhesion of metal layers or other materials to the surface during subsequent processing, such as vacuum aluminum deposition or coating of other functional layers, thereby enhancing the overall performance and stability of the reflective film. The hydrophilic treatment not only improves the surface properties of the UV resin layer 200, but also helps to enhance its weather resistance and chemical resistance. The hydrophilic treated surface is more stable and can resist erosion by external factors such as ultraviolet rays, humidity and chemicals, thereby extending the service life of the reflective film. Specific embodiments The following will further introduce some specific embodiments to further explain the technical solution of this application in detail. The composition is prepared according to the following two groups of specific embodiments, and the specific components are shown in Table 1 and Table 2.

[0037] Table 1 Components and weights of the first group of specific embodiments Table 2 Components and weights of the second group of specific embodiments In various specific embodiments, the glue prepared above is coated on a 38 μm PET optical film, which is then cured and demolded in sequence, and then aluminum is plated by vacuum evaporation.

[0038] The above two groups of specific implementation methods were tested, and specific test items included adhesion, dyne value, and peel strength test after vacuum evaporation.

[0039] Surface tension test (dyne value test): Use A.Shine dyne value test pen for testing.

[0040] Adhesion test: Use a grid knife to test and 3M-600 test tape to test, and count the number of coatings that fall off.

[0041] Peel strength test: Using a peel force tester, a standard sample (100×5mm) is prepared for the sample, and then a 180° peel strength test is performed. In the test of the technical solution of this application, an EVA adhesive layer is specifically coated on the photovoltaic panel, and then the aluminum-plated layer of the reflective film is bonded to the EVA adhesive layer through a vacuum lamination method, and then a peel test is performed. The judgment results include no separation at all, partial separation, occasional separation and separation.

[0042] The relevant test results are shown in Tables 3 and 4.

[0043] Table 3 Test results of the first group of specific implementation methods Table 4 Test results of the second group of specific implementation methods According to the above-described embodiments and test results, it can be found that when there is no oligomer (Comparative Examples 1 and 2), the resin layer will completely peel off from the aluminum layer. When the oligomer ratio is low or too high (Comparative Examples 3 and 4), the resin layer and the aluminum layer will also partially peel off. In addition, when no adhesion promoter is present (Comparative Examples 5 and 6), the anti-peeling effect between the resin layer and the aluminum layer is poor. When the adhesion promoter content is low or excessive (Comparative Examples 7 and 8), it cannot achieve a good anti-peeling effect. Through the above-described tests, it can be found that the UV resin for photovoltaic interstitial reflective film provided in this application, within the range of each component and weight part shown, can significantly improve the peel strength between the aluminum layer and the resin layer after aluminum plating by vacuum evaporation process, so that the aluminum layer will not fall off the resin layer.

[0044] As can be seen from the foregoing, this application provides a UV resin composition for reflective sheeting and reflective sheeting produced using this composition. Through an optimized formulation and preparation process, this UV resin composition improves the surface tension and peel strength of the aluminum-plated layer of the reflective sheeting, while maintaining excellent weather resistance and optical properties. The composition primarily comprises oligomers containing carboxyl and hydroxyl groups, a reactive diluent, a leveling agent, a photoinitiator, and an adhesion promoter. The synergistic effect of these components enhances the interaction between the resin and the metal layer, improving the overall performance of the coating.

[0045] As the backbone of the resin system, the oligomer not only provides the necessary strength and toughness, but its carboxyl and hydroxyl functional groups also enhance the adhesion and peel strength between the coating and the metal layer through micro-corrosion effects and high polarity. In particular, the oligomer contains both carboxyl and hydroxyl groups, which work synergistically to form a stronger chemical bond between the oligomer and the metal layer, enhancing the cohesion and adhesion between the coating and the substrate, and strengthening the peel strength, scratch resistance, and abrasion resistance of the reflective film. The use of reactive diluents, such as carboxyl-containing acrylic compounds, further enhances the chemical activity and crosslinking density of the resin system.

[0046] The UV resin preparation method of the present application is simple and has a fast curing speed, which is conducive to large-scale industrial production. By carefully selecting raw materials and optimizing the preparation process, the efficient synergistic effect of each component in the formula is ensured, and the overall performance is improved. The reflective film made using the UV resin composition of the present application includes a film substrate layer, a UV resin layer and a metal reflective layer. The UV resin layer has a prismatic microstructure, which is precisely coated on the film substrate layer through a photocuring transfer process, and then vacuum aluminum is used to form a metal reflective layer. The design of the prismatic microstructure maximizes the refraction and reflection efficiency of light, improves the brightness and uniformity of the reflective film, and the surface of the UV resin layer is also hydrophilic treated to further improve its wettability, adhesion and weather resistance, thereby enhancing the overall performance and stability of the reflective film.

[0047] The above is only a specific implementation of the present application. Any other improvements made based on the concept of the present application are considered to be within the scope of protection of the present application.

Claims

1. A UV resin composition for reflective film, characterized in that: The composition comprises the following components in parts by weight: Oligomer 5~35 parts Active diluent 20~80 parts Leveling agent 0.2~1.3 parts Adhesion promoter 2~10 parts 2~7 parts of photoinitiator; Wherein, the oligomer contains a carboxyl group.

2. The UV resin composition for reflective film according to claim 1, characterized in that: The oligomers also contain hydroxyl groups.

3. The UV resin composition for reflective film according to claim 1, characterized in that: The reactive diluent contains a carboxyl group.

4. The UV resin composition for reflective film according to claim 3, characterized in that: The active diluent is one or more of hydroxyethyl acrylate (HEA), hydroxyethyl methacrylate (HEMA), hydroxypropyl methacrylate (HPMA), 2-carboxyethyl acrylate (CEA), polyethylene glycol (6) acrylate, polyethylene glycol (11) acrylate, polyethylene glycol (6) methacrylate, polyethylene glycol (11) methacrylate, caprolactone acrylate (CA), pentaerythritol triacrylate (PETA), 2-hydroxy-3-phenoxy-propyl acrylate and hydroxypivalic acid polyglycol diacrylate (HPNDA).

5. The UV resin composition for reflective film according to claim 1, characterized in that: The leveling agent is one or two of an organic silicon leveling agent, an acrylate leveling agent and a fluorocarbon leveling agent.

6. The UV resin composition for reflective film according to claim 1, characterized in that: The photoinitiator is one or more of 1-hydroxy-cyclohexanone benzophenone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, and 2-hydroxy-2-toluene-phenylacetone-1.

7. The UV resin composition for reflective film according to claim 1, characterized in that: The adhesion promoter is a resin containing a carboxyl group.

8. A reflective film, characterized in that: The invention comprises a film substrate layer, a UV resin layer and a metal reflective layer, wherein the UV resin layer is made of the UV resin composition for reflective film according to any one of claims 1 to 7.

9. The reflective film according to claim 8, characterized in that: The UV resin layer is a prism microstructure, and the prism microstructure includes a plurality of prisms arranged in parallel, and the cross section of the prism is a triangle.

10. The reflective film according to claim 8, characterized in that: The surface of the UV resin layer is treated to be hydrophilic.

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