Novel flexible reflective film and preparation method thereof

Abstract

The invention provides a novel flexible reflective film and a preparation method thereof. The novel flexible reflective film comprises a base material layer, a sealing layer and a reflective film layer which are formed on the base material layer, and a back adhesive layer and a peelable layer which are formed below the base material layer, the reflective film layer is formed by UV (ultraviolet) forming microprisms on a flexible PVC (polyvinyl chloride) film; the base material layer is formed by a curing visbreaking layer and a hot melt adhesive layer which are coated on a PET (Polyethylene Terephthalate) film; the sealing layer is correspondingly formed by performing hot embossing treatment on the reflective film and the base material layer; further stripping the PET film to enable the substrate layer and the reflective film layer to form a flexible film main body; the gum layer and the peelable layer are formed after gum treatment of the flexible film main body; according to the reflective film, the microprism structure is formed on the flexible PVC film through UV, the flexible isolation layer and the hot melt adhesive layer are constructed on the basis of the PET film, the rigid PET film is correspondingly torn off after the base material layer is constructed, and then only one flexible film body is left, so that the flexibility of the reflective film is effectively improved, and the reflective film can be better attached to a substrate.

Description

Technical Field

[0001] The present invention relates to the technical field of reflective films, and in particular to a novel flexible reflective film and a preparation method thereof. Background Art

[0002] With the increasing use of reflective film in various application scenarios, it is no longer limited to traditional flat signs, but is increasingly used in scenes with complex curved shapes such as small-diameter reflective columns and reflective cones. Therefore, higher requirements are placed on the flexibility and fit of the reflective film.

[0003] However, the reflective films currently on the market are generally very rigid, and when facing complex surfaces, they often cannot be fully adhered to, resulting in large internal tension, which in turn leads to problems such as warping and falling off. This not only affects the appearance and service life of the product, but may also reduce its reflective performance at night or in low visibility conditions, weakening its core function.

[0004] In addition, traditional reflective films are generally composed of multiple layers of materials, mainly including a surface layer with reflective function and a bottom layer that carries sealant. In order to enhance the reflective effect and ensure its waterproof and dustproof functions, these films often adopt high-strength composite structures, resulting in high tensile strength. However, while this design increases strength, it also limits the flexibility of the material, especially when it is necessary to cover curved or small radius surfaces, the rigidity of the film makes it difficult to fit closely with the substrate. In actual use, this high-tension film material not only increases the difficulty of installation, but is also prone to edge warping or partial detachment when affected by external forces or the environment.

[0005] In addition, the sealing process of traditional reflective film often uses adhesive layer bonding. Although this design can ensure the sealing and durability of the film layer, the presence of the adhesive layer in the composite film layer after bonding further increases the overall hardness of the film material and reduces its ability to adapt to complex curved surfaces. The phenomenon that the film material is difficult to bond evenly is more obvious, which not only affects the use effect of the reflective film, but also brings challenges to batch molding and manufacturing, making it difficult to achieve an efficient and stable production process. In view of this, this application is specially proposed. Summary of the invention

[0006] In view of this, an object of the present invention is to provide a novel flexible reflective film and a preparation method thereof to solve the above problems.

[0007] The present invention adopts the following scheme:

[0008] In one aspect, the present application provides a method for preparing a novel flexible reflective film, comprising the following steps:

[0009] S1: providing a flexible PVC film, and correspondingly UV-molding micro-prisms on the flexible PVC film to construct a reflective film layer;

[0010] S2: providing a PET film, first forming a flexible isolation layer on the PET film, then forming a hot melt adhesive layer on the flexible isolation layer, and then drying to construct a substrate layer;

[0011] S3: matching and laminating the reflective film layer on the hot melt adhesive layer, and pressing the reflective film layer at high temperature through a pressing roller to form a sealing layer at the junction of the substrate layer and the reflective film layer;

[0012] S4: After waiting for more than 24 hours, the PET film is peeled off accordingly, so that the substrate layer and the reflective film layer cooperate to form a flexible film body;

[0013] S5: After the back adhesive treatment of the flexible film body, a back adhesive layer and a peelable layer are formed, and a new type of flexible reflective film product is formed after slitting.

[0014] As a further improvement, in step S1, it further includes:

[0015] On the mold of reflective film micro prism, 70g / m 2 The spraying amount is 1000-10000mj / cm after evenly spraying UV transfer glue, then laminating on PVC film and fully compounding. 2 The reflective film layer is formed by curing under light.

[0016] As a further improvement, the UV transfer glue at least comprises:

[0017] 20-30% of epoxy acrylate oligomer, or 10-30% of polyurethane acrylate oligomer; and,

[0018] 15-40% of a bifunctional reactive diluent, or 15-40% of a multifunctional reactive diluent; and,

[0019] Photoinitiator 1-5%; and,

[0020] Functional additives 0-2%.

[0021] As a further improvement, the bifunctional active diluent is one or more of NPGDA, HDDA, TPGDA, and PEG400DA; the multifunctional active diluent is one or more of TMPTMA, PET3A, TMPMA, PPTTA, and D ITMPTA; the photoinitiator is one or more of photoinitiator 1173, photoinitiator 184, photoinitiator TPO, and photoinitiator MBF; the functional additive is a functional additive for mold release, leveling, or yellowing resistance.

[0022] As a further improvement, in step S2, it further includes:

[0023] On the 30um PET film, a curing viscosity-reducing glue is coated with a thickness of 50-100um by gap coating, the coating speed is 5-20m / min, the drying temperature is 100-180℃, and a semi-finished substrate layer with a flexible isolation layer is formed after winding;

[0024] In addition, the semi-finished substrate layer is further coated with hot melt glue in a thickness of 100-200um by gap coating, the coating speed is 2-10m / min, the drying temperature is 100-180°C, and after winding, a finished substrate layer with a hot melt adhesive layer and a flexible isolation layer is formed.

[0025] As a further improvement, the curing and viscosity-reducing glue is configured to contain 30-60% of curing and viscosity-reducing glue, 5-20% of curing agent, 20-50% of ester solvent, and 0-1% of reaction rate controlling catalyst.

[0026] As a further improvement, the hot melt adhesive is configured to include 30-60% copolyester resin, 10-30% polyurethane resin, 40-60% combined solvent, 1-5% isocyanate curing agent, and 0-1% catalyst.

[0027] As a further improvement, in step S3, it further includes:

[0028] Through the hot embossing process, the reflective film layer and the substrate layer are passed through a high-temperature pressing roller with carvings, and the sealing layer at the composite joint is at least a reflective film UV prism structure and a coating structure on the substrate film;

[0029] Among them, the temperature is 150-220°C, the pressure is 0.3-1 MPa, and the speed is 1-5 m / min.

[0030] On the other hand, the present application also provides a new flexible reflective film, which is prepared according to the above-mentioned preparation method. The new flexible reflective film includes a substrate layer, a sealing layer and a reflective film layer formed on the substrate layer, and a backing layer and a peelable layer formed under the substrate layer.

[0031] As a further improvement, the reflective film layer is formed by UV-molded microprisms on a flexible PVC film; the substrate layer is formed by a cured anti-viscosity layer and a hot-melt adhesive layer coated on a PET film; the sealing layer is formed by hot embossing the reflective film and the substrate layer; the PET film is further peeled off so that the substrate layer and the reflective film layer form a flexible film body; and the flexible film body is subjected to back adhesive treatment to form the back adhesive layer and the peelable layer.

[0032] By adopting the above technical solution, the present invention can achieve the following technical effects:

[0033] 1. The preparation method of the novel flexible reflective film of the present application is to UV mold a micro-prism structure on a flexible PVC film, and construct a flexible isolation layer and a hot-melt adhesive layer on the basis of a PET film. After constructing the substrate layer, the rigid PET film is torn off, leaving only a flexible film body, which effectively improves the flexibility of the reflective film. When facing complex surfaces such as small-diameter reflective columns and reflective cones, the reflective film can better fit the substrate, avoiding the warping and falling off of traditional film materials due to excessive rigidity, and ensuring that the reflective film can be stably applied in various curved surface structures.

[0034] 2. Compared with the traditional setting of sealant layer, this case forms a more uniform sealing layer at the junction of the substrate layer and the reflective film layer through the hot melt adhesive layer and high temperature pressing of the pressure roller, which effectively reduces the tension concentration area and prevents the reflective film from peeling off due to excessive tension, making the overall performance of the film material more stable, and the process is simpler and conducive to batch molding and manufacturing.

[0035] 3. The novel flexible reflective film of the present application has excellent flexibility by UV molding a micro-prism structure on a flexible PVC film, and introduces a cured viscosity-reducing layer and a hot-melt adhesive layer into the substrate layer, which provides favorable conditions for the subsequent PET film peeling step after high-temperature pressing. In particular, the reflective film layer and the substrate layer are combined by hot embossing treatment to form a sealing layer, which effectively simplifies the formation process of the sealing layer, not only provides stronger waterproof and dustproof capabilities, but also effectively reduces the tension between the materials, making the reflective film more firm after bonding, avoiding delamination and tearing problems caused by excessive tension, and realizing multiple flexibility improvements on the structure of the reflective film, so that the film material can maintain high consistency during mass production, reducing production difficulty and cost, and improving the feasibility of large-scale application. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic structural diagram of a new type of flexible reflective film in an embodiment of the present invention, in which a substrate layer and a reflective film layer cooperate to form a flexible film body;

[0037] Figure 2 is a schematic structural diagram of a novel flexible reflective film according to an embodiment of the present invention;

[0038] Figure 3 It is a flowchart of a method for preparing a novel flexible reflective film according to an embodiment of the present invention.

[0039] Icon: 1-PVC film; 2-PET film; 3-isolation layer; 4-hot melt adhesive layer; 5-sealing layer; 6-back adhesive layer; 7-peelable layer. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention.

[0041] Example

[0042] Combination Figures 1 to 3 In one aspect, this embodiment provides a method for preparing a novel flexible reflective film, comprising the following steps:

[0043] S1: providing a flexible PVC film 1, and correspondingly UV-molding micro-prisms on the flexible PVC film 1 to construct a reflective film layer;

[0044] S2: providing a PET film 2, first forming a flexible isolation layer 3 on the PET film 2, then forming a hot melt adhesive layer on the flexible isolation layer 3, and then drying to construct a substrate layer;

[0045] S3: The reflective film layer is matched and bonded to the hot melt adhesive layer 4, and is pressed to the reflective film layer at high temperature by a pressing roller to form a sealing layer 5 at the junction of the substrate layer and the reflective film layer;

[0046] S4: After waiting for more than 24 hours, the PET film 2 is peeled off accordingly, so that the substrate layer and the reflective film layer cooperate to form a flexible film body;

[0047] S5: After the back adhesive treatment of the flexible film body, a back adhesive layer 6 and a peelable layer 7 are formed, and after cutting, a new flexible reflective film product is formed.

[0048] In the above, a micro-prism structure is UV molded on the flexible PVC film 1, and a flexible isolation layer 3 and a hot-melt adhesive layer 4 are constructed on the basis of the PET film 2. After the substrate layer is constructed, the rigid PET film 2 is torn off, leaving only a flexible film body, which effectively improves the flexibility of the reflective film. When facing complex surfaces such as small-diameter reflective columns and reflective cones, the reflective film can better fit the base material, avoiding the warping and falling off caused by the excessive rigidity of traditional film materials, ensuring that the reflective film can be stably used in various curved surface structures.

[0049] Therefore, compared with the traditional setting of the sealing glue layer, this case forms a more uniform sealing layer 5 at the junction of the base material layer and the reflective film layer through the hot melt adhesive layer 4 and the high-temperature pressing of the pressure roller, which effectively reduces the tension concentration area and prevents the reflective film from peeling off due to excessive tension, making the overall performance of the film material more stable, and the process is simpler and conducive to batch molding and manufacturing.

[0050] In step S1, it also includes:

[0051] On the mold of reflective film micro prism, 70g / m 2 The spraying amount is 1000-10000mj / cm after evenly spraying UV transfer glue and then laminating on PVC film 1 and fully compounding. 2 The reflective film layer is formed by curing under light. Thus, through the above-mentioned spraying and curing steps, not only the optical performance of the reflective film layer is improved, so that it can effectively enhance the intensity and angle adaptability of the reflected light under light irradiation, but also the production efficiency is optimized, so that the micro-prism structure can maintain a high degree of consistency in mass production.

[0052] Wherein, the UV transfer glue at least comprises:

[0053] 20-30% of epoxy acrylate oligomer, or 10-30% of polyurethane acrylate oligomer; and,

[0054] 15-40% of a bifunctional reactive diluent, or 15-40% of a multifunctional reactive diluent; and,

[0055] Photoinitiator 1-5%; and,

[0056] Functional additives 0-2%.

[0057] Specifically, the bifunctional active diluent is one or more of NPGDA, HDDA, TPGDA, and PEG400DA. The multifunctional active diluent is one or more of TMPTMA, PET3A, TMPMA, PPTTA, and DI TMPTA. The photoinitiator is one or more of photoinitiator 1173, photoinitiator 184, photoinitiator TPO, and photoinitiator MBF. The functional additive is a functional additive for demoulding, leveling, or yellowing resistance.

[0058] In the above, by precisely controlling the ratio of the photoinitiator, the glue can be quickly cured under UV light, ensuring that the microprism structure is clearly formed on the film material and improving the reflective effect. The combination of oligomers and active diluents ensures that the glue has ideal flexibility and strength after curing, meeting the application requirements of flexible reflective film, especially suitable for laminating complex curved surfaces. The addition of functional additives effectively improves the processing performance of the glue and ensures smooth operation during spraying and curing. At the same time, the epoxy or polyurethane oligomers in the glue provide excellent weather resistance, giving the reflective film long-term anti-aging ability.

[0059] In step S2, it also includes:

[0060] On the 30um PET film 2, a curable viscosity-reducing glue is coated with a thickness of 50-100um by gap coating, the coating speed is 5-20m / min, the drying temperature is 100-180°C, and a semi-finished substrate layer with a flexible isolation layer 3 is formed after winding; and, on the semi-finished substrate layer, a hot melt glue is further coated with a thickness of 100-200um by gap coating, the coating speed is 2-10m / min, the drying temperature is 100-180°C, and a substrate layer with a hot melt adhesive layer 4 and a flexible isolation layer 3 is formed after winding. Thus, the coating thickness of the curable viscosity-reducing glue and the hot melt glue is accurately controlled by the gap coating process, so that the substrate layer has good flexibility and adaptability, and the addition of the curable viscosity-reducing glue effectively forms a flexible isolation layer 3, which is used as the core body of the substrate layer, while ensuring the release effect of the PET film 2.

[0061] Furthermore, the curing and viscosity-reducing glue is configured to include 30-60% curing and viscosity-reducing glue, 5-20% curing agent, 20-50% ester solvent, and 0-1% reaction rate control catalyst. Also, the hot melt glue is configured to include 30-60% copolyester resin, 10-30% polyurethane resin, 40-60% combined solvent, 1-5% isocyanate curing agent, and 0-1% catalyst. By rationally configuring the components of the curing and viscosity-reducing glue and the hot melt glue, not only the substrate layer has good flexibility and can adapt to complex curved surfaces, but also the firm adhesion between the reflective film layer and the substrate layer is ensured, effectively avoiding the problems of warping and falling off of the reflective film during bending or stretching.

[0062] In step S3, it also includes:

[0063] Through the hot embossing process, the reflective film layer and the substrate layer are passed through a high-temperature pressing roller with carvings, and the sealing layer 5 at the composite joint is at least a reflective film UV prism structure and a substrate film coating structure. The temperature is 150-220°C, the pressure is 0.3-1mpa, and the speed is 1-5m / min.

[0064] On the one hand, a high-temperature pressing roller with carvings is used to ensure that the reflective film layer and the substrate layer can form a sealing layer 5 structure with a texture during the bonding process. The carving-designed pressing roller can not only improve the appearance of the reflective film, but also improve the bonding strength between the reflective film and the substrate layer.

[0065] On the other hand, the precise control of temperature, pressure and speed enables the film to reach an ideal softening or bonding state in a short time, thereby forming a strong bonding effect, especially the UV prism structure of the reflective film and the coating layer on the substrate, which can better fit each other at high temperature to form a stable sealing layer 5.

[0066] In conjunction with the figure, on the other hand, the present application also provides a novel flexible reflective film, which is prepared according to the above preparation method. The novel flexible reflective film comprises a substrate layer, a sealing layer 5 and a reflective film layer formed on the substrate layer, and a back adhesive layer 6 and a peelable layer 7 formed below the substrate layer.

[0067] The reflective film layer is formed by UV-molded microprisms on a flexible PVC film 1. The substrate layer is formed by a cured anti-viscosity layer and a hot melt adhesive layer 4 coated on a PET film 2. The sealing layer 5 is formed by heat embossing the reflective film and the substrate layer. The PET film 2 is further peeled off so that the substrate layer and the reflective film layer form a flexible film body. The flexible film body is subjected to adhesive backing treatment to form the adhesive backing layer 6 and the peelable layer 7. Obviously, the peelable layer 7 is similar to the PET film and can be torn off relative to the film body.

[0068] The novel flexible reflective film mentioned above has a micro-prism structure formed on a flexible PVC film 1 by UV, so that the reflective film layer has excellent flexibility, and a cured anti-viscosity layer and a hot-melt adhesive layer 4 are introduced into the substrate layer, providing favorable conditions for the subsequent peeling step of the PET film 2 after high-temperature pressing.

[0069] In particular, the reflective film layer and the base material layer are combined through hot embossing treatment to form a sealing layer 5, which effectively simplifies the formation process of the sealing layer 5, not only provides stronger waterproof and dustproof capabilities, but also effectively reduces the tension between the materials, making the reflective film more firm after bonding, avoiding delamination and tearing problems caused by excessive tension, and achieving multiple flexibility improvements on the structure of the reflective film, so that the film material can maintain high consistency during mass production, reducing production difficulty and cost, and improving the feasibility of large-scale application.

[0070] The above are only preferred implementations of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention.

Claims

1. A method for preparing a novel flexible reflective film, characterized in that: The steps include: S1: providing a flexible PVC film, and correspondingly UV-molding micro-prisms on the flexible PVC film to construct a reflective film layer; S2: providing a PET film, first forming a flexible isolation layer on the PET film, then forming a hot melt adhesive layer on the flexible isolation layer, and then drying to construct a substrate layer; S3: matching and laminating the reflective film layer on the hot melt adhesive layer, and pressing the reflective film layer at high temperature through a pressing roller to form a sealing layer at the junction of the substrate layer and the reflective film layer; S4: After waiting for more than 24 hours, the PET film is peeled off accordingly, so that the substrate layer and the reflective film layer cooperate to form a flexible film body; S5: After the back adhesive treatment of the flexible film body, a back adhesive layer and a peelable layer are formed, and a new type of flexible reflective film product is formed after slitting.

2. The method for preparing the novel flexible reflective film according to claim 1, characterized in that: In step S1, it also includes: On the mold of reflective film micro prism, 70g / m 2 The spraying amount is 1000-10000mj / cm after evenly spraying UV transfer glue, then laminating on PVC film and fully compounding. 2 The reflective film layer is formed by curing under light.

3. The method for preparing the novel flexible reflective film according to claim 2, characterized in that: The UV transfer glue at least comprises: 20-30% of epoxy acrylate oligomer, or 10-30% of polyurethane acrylate oligomer; and, 15-40% of a bifunctional reactive diluent, or 15-40% of a multifunctional reactive diluent; and, Photoinitiator 1-5%; and, Functional additives 0-2%.

4. The method for preparing the novel flexible reflective film according to claim 3, characterized in that: The bifunctional active diluent is one or more of NPGDA, HDDA, TPGDA, and PEG400DA; the multifunctional active diluent is one or more of TMPTMA, PET3A, TMPMA, PPTTA, and DITMPTA; the photoinitiator is one or more of photoinitiator 1173, photoinitiator 184, photoinitiator TPO, and photoinitiator MBF; the functional additive is a functional additive for demolding, leveling, or yellowing resistance.

5. The method for preparing the novel flexible reflective film according to claim 1, characterized in that: In step S2, it also includes: On the 30um PET film, a curing viscosity-reducing glue is coated with a thickness of 50-100um by gap coating, the coating speed is 5-20m / min, the drying temperature is 100-180℃, and a semi-finished substrate layer with a flexible isolation layer is formed after winding; In addition, the semi-finished substrate layer is further coated with hot melt glue in a thickness of 100-200um by gap coating, the coating speed is 2-10m / min, the drying temperature is 100-180°C, and after winding, a finished substrate layer with a hot melt adhesive layer and a flexible isolation layer is formed.

6. The method for preparing the novel flexible reflective film according to claim 5, characterized in that: The solidified viscosity-reducing glue is configured to contain 30-60% of the solidified viscosity-reducing glue, 5-20% of the curing agent, 20-50% of the ester solvent, and 0-1% of the reaction speed control catalyst.

7. The method for preparing the novel flexible reflective film according to claim 5, characterized in that: The hot melt adhesive is configured to contain 30-60% of copolyester resin, 10-30% of polyurethane resin, 40-60% of combined solvent, 1-5% of isocyanate curing agent, and 0-1% of catalyst.

8. The method for preparing the novel flexible reflective film according to claim 1, characterized in that: In step S3, it also includes: Through the hot embossing process, the reflective film layer and the substrate layer are passed through a high-temperature pressing roller with carvings, and the sealing layer at the composite joint is at least a reflective film UV prism structure and a coating structure on the substrate film; Among them, the temperature is 150-220°C, the pressure is 0.3-1 MPa, and the speed is 1-5 m / min.

9. A novel flexible reflective film, prepared according to the preparation method according to any one of claims 1 to 8, characterized in that: The novel flexible reflective film comprises a substrate layer, a sealing layer and a reflective film layer formed on the substrate layer, and a back adhesive layer and a peelable layer formed below the substrate layer.

10. The novel flexible reflective film according to claim 9, characterized in that: The reflective film layer is formed by UV-molded microprisms on a flexible PVC film; the substrate layer is formed by a cured anti-viscosity layer and a hot-melt adhesive layer coated on a PET film; the sealing layer is formed by heat-embossing the reflective film and the substrate layer; the PET film is further peeled off so that the substrate layer and the reflective film layer form a flexible film body; and the flexible film body is subjected to adhesive backing treatment to form the adhesive backing layer and the peelable layer.

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