Colorful light-reflecting heat-sticking film with patterns and manufacturing method of colorful light-reflecting heat-sticking film

Abstract

The invention relates to a patterned colored reflective hot pasting film and a manufacturing method thereof. The patterned colored reflective hot pasting film comprises a base film layer, an upper bonding layer, a bead planting glue layer, a focusing layer, a metal reflecting layer, a lower bonding layer and a base material layer which are sequentially arranged, a barrier protection layer and a color layer which correspond to each other up and down are arranged at the position in the focusing layer in contact with the bead planting glue layer, and the printed patterns of the barrier protection layer and the color layer are the same; the bead planting glue layer is provided with a glass microsphere layer, the color layer is combined with the glass microsphere layer, and the barrier protection layer is used for preventing the glass microsphere layer from being attached to the bead planting glue layer. According to the invention, through collaborative innovation of layering function optimization, embedded pattern design and glass microsphere isolation protection, the core defects of the existing patterned colored reflective hot pasting film are comprehensively overcome.

Description

Technical Field

[0001] This invention relates to the field of reflective heat-adhesive film technology, and in particular to a patterned colored reflective heat-adhesive film and its manufacturing method. Background Technology

[0002] Reflective heat-applied film, as a material that combines reflective warning function with decorative appeal, is widely used in personal protective equipment, traffic signs, outdoor bags, and children's clothing. Colored reflective heat-applied film with customized patterns continues to see increasing demand because it can simultaneously fulfill both reflective warning and display display requirements.

[0003] Currently, the mainstream process for preparing patterned colored reflective heat-bonded films in the industry is as follows: first, the finished reflective heat-bonded film is initially bonded to a positioning tape; then, the protective film on the surface of the heat-bonded film is peeled off, and a colored pattern is directly formed on the exposed surface of the glass microspheres using a printing process; finally, a layer of high-peel-strength positioning tape is bonded on to complete the product preparation. Although this process can achieve preliminary printing of the pattern, it has the following insurmountable drawbacks: The limitations of printing substrates restrict ink selection: Current processes print on glass microspheres on the surface of reflective heat-bonded films. However, the substrate of these films is prone to deformation during printing due to heat (such as during the printing and drying process), making it difficult to control printing accuracy. To avoid substrate deformation, the type of resin used in the printing ink must be strictly matched to the heat resistance of the substrate. Only resin systems with low softening points and low curing temperatures can be selected. However, such resins typically exhibit poor adhesion and weather resistance, failing to balance the durability of the pattern with the overall performance of the reflective layer.

[0004] The product has poor washability: Because the printing process is performed directly on the surface of the glass microspheres, the curved structure and unevenness of the microsphere surface make it difficult for the ink coating to cover evenly, and there are many gaps at the interface between the coating and the microspheres. At the same time, due to the limitations of the substrate's heat resistance, the coating drying process cannot use high temperatures or long periods, resulting in insufficient ink curing and the presence of incompletely cross-linked components within the coating. These problems cause the pattern to easily peel off and fade after washing or dry cleaning, and the reflective layer will also be exposed due to coating peeling, leading to a significant decrease in reflectivity due to detergent corrosion, severely affecting the product's lifespan.

[0005] Large graphic size errors and low precision: On the one hand, the surface of glass microspheres has a dispersed arc-shaped protrusion structure, and the ink is prone to "ink overflow" and "ink break" phenomena during printing due to the unevenness of the microspheres; on the other hand, the heat-adhesive film substrate is prone to shrinkage or deformation during printing and drying, resulting in stretching and offset of the printed pattern. Ultimately, the graphic size error of the finished product far exceeds the design requirements, the pattern edges are blurred and the consistency is poor. In particular, it affects the unclear information transmission of logo patterns and weakens their functional value.

[0006] Existing patterned colored reflective heat-converting films cannot meet the market demand for high-precision, high-durability colored reflective heat-converting films, so improvements are needed to address these issues. Summary of the Invention

[0007] This invention addresses the shortcomings of existing technologies, such as poor durability and low pattern precision, by providing a new patterned colored reflective heat-adhesive film and its manufacturing method.

[0008] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: A patterned colored reflective heat-adhesive film includes a base film layer, an upper adhesive layer, a beaded adhesive layer, a focusing layer, a metal reflective layer, a lower adhesive layer, and a substrate layer arranged sequentially. A barrier protective layer and a colored layer are disposed at positions within the focusing layer that contact the beaded adhesive layer. The barrier protective layer and the colored layer have the same printed pattern. A glass microsphere layer is disposed within the beaded adhesive layer. The colored layer is bonded to the glass microsphere layer. The barrier protective layer is used to prevent the glass microsphere layer from adhering to the beaded adhesive layer.

[0009] The base film layer provides a stable carrier for the precise processing of subsequent functional layers. The upper adhesive layer solves the problems of poor interlayer bonding and easy delamination in existing structures. The bead adhesive layer solves the problems of inaccurate microsphere positioning and reduced reflectivity caused by the improper melting point of existing bead adhesive layers. The focusing layer protects the internal metal reflective layer from corrosion by external detergents and solvents (solving the defect of easy corrosion of existing metal reflective layers), and its excellent light transmittance ensures that light efficiently penetrates to the glass microsphere layer without affecting the reflective function. The metal reflective layer ensures the core reflective warning function of the product, solving the problems of low reflectivity and poor reflective effect of existing reflective layer materials. The lower adhesive layer is used to prevent the metal reflective layer from peeling off from the substrate layer during use or washing. The substrate layer is adapted to the bending and friction requirements of personal protective equipment, children's clothing, and other scenarios, taking into account both product lightweighting and structural strength, solving the problems of poor wear resistance and limited application scenarios of existing substrates.

[0010] The barrier layer can serve as a protective barrier for the colored layer. Its solvent resistance and hydrophobicity can prevent detergent from directly contacting the colored layer during washing, thus avoiding fading and peeling of the colored layer. At the same time, the colored layer material itself is resistant to high-temperature boiling water and has a high bonding strength with the glass microspheres. The two work together to solve the defect of poor wash resistance of existing colored layers.

[0011] By placing the color layer and barrier protective layer within the focusing layer instead of on the surface of glass microspheres, as in existing technologies, the ink overflow and ink breakage phenomena caused by the curved surface of glass microspheres can be avoided, achieving uniform pattern coverage. Simultaneously, there is no substrate deformation interference during printing (the base film layer already provides a stable carrier), solving the problems of blurred edges and large dimensional errors in existing patterns. Both are printed using the same anilox roller, ensuring complete pattern correspondence and enabling precise positioning of customized patterns. This is particularly suitable for scenarios with high precision requirements, such as traffic signs and warning patterns, resolving the problems of pattern misalignment and poor consistency in existing technologies.

[0012] During bead implantation, the bead adhesive layer melts while the barrier protective layer remains solid, effectively separating the glass microspheres from the bead adhesive layer, preventing the microspheres from sticking together, and ensuring a uniform distribution of the microsphere layer.

[0013] This invention comprehensively solves the core defects of existing patterned color reflective heat-adhesive films through the synergistic innovation of "layered function optimization + embedded pattern design + glass microsphere isolation protection".

[0014] Preferably, the patterned colored reflective heat-adhesive film described above has a base film layer that is a PET layer that has been corona-treated or chemically treated, and the thickness of the base film layer is 50μm to 125μm; the substrate layer is made of one of TPU, PU, ​​PES, and PVC, and the thickness of the substrate layer is 30μm to 80μm.

[0015] The PET material of the base film layer itself possesses excellent dimensional stability and heat resistance, allowing it to withstand heat source baking during subsequent processing. This avoids printing pattern misalignment and interlayer misalignment caused by heat shrinkage and warping of the substrate in existing technologies, providing a stable carrier foundation for the entire product processing. Corona treatment or chemical treatment can alter the physical morphology (e.g., increasing surface roughness) or chemical properties (e.g., introducing polar groups) of the PET layer surface, significantly improving the adhesion between the base film layer and the upper adhesive layer. This prevents peeling issues between the base film layer and the upper adhesive layer during subsequent use or processing, ensuring product structural stability. The thickness range of the base film layer ensures dimensional stability and heat resistance while avoiding excessive rigidity due to excessive thickness, without sacrificing core functions (e.g., supporting various functional layers and resisting deformation).

[0016] The four materials in the substrate layer each possess unique characteristics, covering a wider range of application scenarios. All four materials exhibit excellent flexibility and durability, preventing damage to the substrate layer due to stretching and friction during use. They also effectively bond with the underlying adhesive layer, ensuring the product is less prone to delamination during washing, outdoor use, and other conditions. The thickness range of the substrate layer ensures complete melting and a firm bond with the substrate (such as clothing fabric) during subsequent heat bonding.

[0017] Preferably, in the above-described patterned colored reflective heat-adhesive film, the upper adhesive layer is made of one or more of polyurethane resin, polyester resin, and polyolefin resin; the upper adhesive layer also contains a curing agent, which is one or more of isocyanate curing agent, epoxy curing agent, and aziridine curing agent; the thickness of the upper adhesive layer is 5μm to 10μm; the lower adhesive layer is made of one or more of polyurethane resin, polyester resin, and epoxy-modified acrylic resin; the lower adhesive layer also contains a curing agent, which is one or more of isocyanate curing agent, epoxy curing agent, and aziridine curing agent; the thickness of the lower adhesive layer is 20μm to 50μm.

[0018] All three resins in the top adhesive layer possess excellent coatability, allowing for uniform film formation through the coating process and avoiding localized insufficient adhesion caused by uneven coating. Simultaneously, their temperature resistance is suitable for subsequent bead-planting baking, preventing softening or decomposition due to baking temperatures, ensuring the stability of the adhesive layer's function during processing. The top adhesive layer contains a curing agent, which undergoes a cross-linking reaction with the resin in the top adhesive layer, forming a three-dimensional network structure. Through single or mixed use, the top adhesive layer can be transformed from a linear resin into a cross-linked structure, solving the problems of poor solvent resistance and easy aging caused by insufficient curing in existing adhesive layers. The cross-linked adhesive layer is less prone to thermal shrinkage or deformation, maintaining a tight bond between the base film layer and the bead adhesive layer for a long time. This prevents interlayer loosening under repeated use or environmental changes (such as temperature and humidity fluctuations), extending the product's lifespan. The thickness range of the top adhesive layer, as an intermediate functional layer, avoids the overall heaviness and rigidity of the product caused by an excessively thick intermediate layer, ensuring the product's suitability for applications requiring "lightweight and thin" materials, such as clothing and bags.

[0019] All three resins in the lower adhesive layer possess excellent sealing properties, forming a dense coating on the surface of the metal reflective layer. This prevents external detergents and moisture from directly contacting the metal reflective layer (e.g., aluminum layers are prone to oxidation), avoiding corrosion and ensuring long-term stability of reflective performance. The lower adhesive layer contains a curing agent. After cross-linking with the lower adhesive layer resin, the curing agent improves durability without excessively reducing the flexibility of the adhesive layer. This allows it to withstand bending and stretching of the substrate layer for extended periods, preventing cracking and peeling caused by excessive rigidity. Ultimately, this solves the defects of existing lower adhesive layers, such as poor wash resistance and susceptibility to chemical corrosion due to insufficient curing. The thickness range of the lower adhesive layer ensures sufficient bonding area and strength to meet the core application requirements of reflective heat-bonding films.

[0020] Preferably, in the above-described patterned colored reflective heat-adhesive film, the material of the beaded adhesive layer is one or more of PP, PE, EVA, EBA, and EAA, and a mixture thereof with an opening agent; the thickness of the beaded adhesive layer is 25% to 35% of the diameter of the glass microspheres in the glass microsphere layer, and the melting point of the beaded adhesive layer is below 150°C; the diameter of the glass microspheres in the glass microsphere layer is 45μm to 95μm, and the refractive index of the glass microspheres is 1.9 to 1.95.

[0021] The material of the bead adhesive layer is better suited to multi-layer structures, improving bonding stability and optimizing processing performance while preventing adhesion. An opening agent effectively reduces the surface adhesion of the bead adhesive layer. The thickness range of the bead adhesive layer allows for precise fixation of microspheres, preventing detachment. After cooling, the bead adhesive layer provides stable fixation to the microspheres, preventing excessive thickness from obstructing the reflective path. The melting point of the bead adhesive layer is optimized for the bead-planting process, preventing high temperatures from damaging the upper base film layer, upper adhesive layer, and lower barrier protective layer, thus solving the problem of heat-induced deformation and functional failure in multi-layer structures caused by excessively high melting points in existing bead adhesive layers. The lower melting point shortens baking time (rapid melting), improving bead-planting processing efficiency and addressing the low efficiency and high cost of existing high-temperature bead-planting processes.

[0022] The diameter range of the glass microsphere layer effectively adapts to the focusing layer design, avoiding agglomeration (uneven arrangement) caused by excessively small particles or excessive gaps (discontinuous reflective areas) caused by excessively large particles. This ensures uniform reflective performance of the product and solves the problem of poor reflective consistency caused by uneven microsphere arrangement in existing products. The refractive index range of the glass microsphere layer enables high reflective efficiency, meets warning requirements, and is compatible with multi-layer optical structures.

[0023] Preferably, in the above-described patterned colored reflective heat-adhesive film, the focusing layer is made of one or more of polyurethane resin, polyester resin, and epoxy-modified acrylic resin, and the thickness of the focusing layer is 5μm to 20μm; the metal reflective layer is made of one of aluminum, silver, and chromium.

[0024] All three resins in the focusing layer possess excellent resistance to organic solvents and sealing properties, forming a dense protective film on the surface of the metal reflective layer. This prevents detergents (such as surfactants) during washing, as well as rainwater and dust in outdoor environments, from directly contacting the metal reflective layer, thus preventing oxidation, corrosion, or peeling. This solves the problem of rapid attenuation of reflective performance caused by the lack of effective protection in existing metal reflective layers. The three resins also exhibit excellent light transmittance, addressing the deficiency of insufficient light transmittance in existing focusing layers that affects reflective efficiency. Furthermore, the three resins better adapt to multilayer structures, enhancing bonding stability and resolving the structural delamination problem caused by weak bonding between existing focusing layers and adjacent layers. The thickness range of the focusing layer balances protective performance and light transmittance, adapting to the glass microsphere structure and ensuring optical synergy. Part of the glass microsphere is embedded in the beaded adhesive layer, while another part is located on the focusing layer side. The thickness range of the focusing layer neither obstructs the core refractive area of ​​the glass microsphere (avoiding impact on reflectivity) nor prevents the glass microsphere from shifting during use, thus solving the problem of optical performance disorder caused by the mismatch between the existing focusing layer and microsphere structure.

[0025] The metal reflective layer uses three metals, all of which have excellent light reflection properties, which can significantly improve light reflection efficiency, ensure reflective warning function, and solve the core problems of weak reflectivity and poor warning effect of existing products.

[0026] Preferably, in the above-mentioned patterned colored reflective heat-adhesive film, the material of the barrier protective layer is one or a mixture of carboxyl-modified acrylic resin, silicone resin, and fluorocarbon resin; the melting point difference between the barrier protective layer and the bead adhesive layer is 30°C or more; and the thickness of the barrier protective layer is 0.5μm to 3μm.

[0027] Of the three resins, the acrylic resin contains carboxyl group modification. All three resins possess excellent solvent resistance and hydrophobicity, forming a protective barrier on the surface of the colored layer. During product washing, they effectively prevent detergents (such as surfactants) and moisture from penetrating into the colored layer, avoiding colorant dissolution or peeling of the colored layer from the glass microspheres, thus solving the fading and peeling problems caused by the lack of effective protection for the colored layer in existing technologies. Simultaneously, the hydrophobicity reduces moisture residue on the barrier layer surface, further reducing the risk of moisture aging of the colored layer. The three resins and the bead-coating layer can form a physical barrier during the bead-coating process, preventing glass microspheres from accidentally adhering to non-target areas of the bead-coating layer (only the glass microspheres need to bond with the colored layer). The three resins can be printed with a specific anilox roller to form a uniform and delicate film layer, and the printing process is less prone to "ink overflow" or "ink breakage," ensuring that the pattern of the barrier protective layer and the colored layer completely corresponds, guaranteeing the accuracy of customized patterns, and solving the problem of blurred pattern edges caused by the poor film-forming properties of existing printing materials.

[0028] The barrier layer has a higher melting point than the bead adhesive layer, ensuring the stability of the bead-planting process and preventing barrier layer failure. During baking, the bead adhesive layer melts and flows, while the barrier layer remains solid. The solid barrier layer prevents component miscibility (such as resin molecule interpenetration) with the molten bead adhesive layer, ensuring that the core properties of the barrier layer, such as solvent resistance and hydrophobicity, are not compromised, thus solving the product performance degradation problem caused by interlayer miscibility. The thickness range of the barrier layer balances the barrier effect with interlayer compatibility.

[0029] Preferably, in the patterned colored reflective heat-adhesive film described above, the material of the colored layer is one of modified polyurethane resin and modified polyester resin; the colored layer also contains a colorant, which is an organic dispersed pigment or a thermal sublimation dye; the thickness of the colored layer is 10μm to 30μm.

[0030] Both modified polyurethane resin and modified polyester resin possess excellent water resistance and detergent resistance, and are resistant to high-temperature boiling water. This allows them to withstand the high temperatures during washing, preventing the resin from swelling and decomposing in an aqueous environment, thus preventing the overall peeling off of the color layer. Compared to existing technologies where the poor washability of ink resin leads to easy fading and peeling of patterns, the color layer material fundamentally improves the durability of the color layer, extends product lifespan, strengthens the bonding stability with glass microspheres, adapts to processing requirements, and possesses excellent printability and film-forming properties.

[0031] The colored layer contains colorants; both organic dispersed pigments and sublimated dyes are used to improve color stability and prevent fading, addressing the shortcomings of existing technologies where poor colorant stability leads to dull colors after short-term use. These two colorants also solve the problems of uneven dispersion and limited color variety in existing colorants, ensuring color uniformity and customizability. Both colorants possess a certain degree of light transmittance, not affecting the core reflective function, preserving the display effect of the pattern without weakening its reflective warning function. This addresses the problem of excessive light-blocking properties in existing technologies, leading to reduced reflectivity. The thickness range of the colored layer balances color coverage and reflectivity, ensuring adhesion to adjacent layers and preventing interlayer delamination.

[0032] A method for manufacturing a patterned colored reflective heat-adhesive film includes the following steps: S1: Take the base film layer, form an upper adhesive layer on the surface of the base film layer by coating, and then bond the beaded adhesive layer to the upper adhesive layer. S2: Use an anilox roller to print a barrier protective layer on the beaded adhesive layer, and then use the same anilox roller to print a colored layer at the same position. After cooling, bake with a heat source until it reaches a molten state. Implant glass microspheres on the surface of the beaded adhesive layer and the colored layer. After cooling, remove the surface dust to obtain a glass microsphere layer. Then, form a focusing layer on the glass microsphere layer by extrusion coating or scraping coating. Vacuum evaporation is performed on the focusing layer to form a metal reflective layer. S3: A composite adhesive is applied to the metal reflective layer to form a lower adhesive layer. The substrate layer is then bonded to the lower adhesive layer, and finally cured to obtain a patterned colored reflective heat-adhesive film.

[0033] Step S1 involves coating an upper adhesive layer onto the film surface to bond the beaded adhesive layer, ensuring initial interlayer bonding stability and meeting the load-bearing requirements of subsequent processes. Step S2 involves printing a barrier protective layer using an anilox roller. Printing a colored layer at the same location on the same anilox roller achieves precise pattern alignment, resolving accuracy defects and optimizing interlayer bonding and functional synergy. Step S2 also precisely controls the beading process to prevent misattachment of glass microspheres. A focusing layer is formed using extrusion or scraping coating to achieve uniform coverage, meeting the optical requirements of the glass microsphere structure. A metallic reflective layer is then vacuum-deposited onto the surface of the focusing layer, improving its quality and reflectivity, and ensuring process compatibility and product stability. Step S3 involves coating a lower adhesive layer to bond the substrate layer and curing it to strengthen the final interlayer bonding and durability, meeting the needs of the product's application scenarios.

[0034] The above steps completely resolve the precision and quality defects of existing processes, significantly improve product durability and service life, and enhance processing stability and mass production capabilities. Attached Figure Description

[0035] Figure 1 This is a cross-sectional schematic diagram of the present invention; Figure 2 This is a top view of the present invention.

[0036] Figure reference numerals: 1. Base film layer, 2. Upper adhesive layer, 3. Beaded adhesive layer, 4. Focusing layer, 41. Barrier protective layer, 42. Color layer, 31. Glass microsphere layer, 5. Metal reflective layer, 6. Lower adhesive layer, 7. Substrate layer.

[0037] like Figure 2 As shown, the printed pattern of the color layer 42 can be directly seen when viewed from above. The printed pattern of the barrier protective layer 41 is the same. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1-2 The invention will be further described in detail with reference to specific embodiments, but these are not intended to limit the invention: A patterned colored reflective heat-adhesive film includes a base film layer 1, an upper adhesive layer 2, a beaded adhesive layer 3, a focusing layer 4, a metal reflective layer 5, a lower adhesive layer 6, and a substrate layer 7 arranged sequentially. A barrier protective layer 41 and a colored layer 42 are disposed in the focusing layer 4 at positions in contact with the beaded adhesive layer 3, with the barrier protective layer 41 and the colored layer 42 having the same printed pattern. A glass microsphere layer 31 is disposed in the beaded adhesive layer 3, and the colored layer 42 is bonded to the glass microsphere layer 31. The barrier protective layer 41 is used to prevent the glass microsphere layer 31 from adhering to the beaded adhesive layer 3.

[0039] Preferably, the base film layer 1 is a PET layer that has been corona-treated or chemically treated, and the thickness of the base film layer 1 is 50μm to 125μm; the substrate layer 7 is made of one of TPU, PU, ​​PES, and PVC, and the thickness of the substrate layer 7 is 30μm to 80μm.

[0040] Preferably, the upper adhesive layer 2 is made of one or more of polyurethane resin, polyester resin, and polyolefin resin; the upper adhesive layer 2 also contains a curing agent, which is one or more of isocyanate curing agent, epoxy curing agent, and aziridine curing agent; the thickness of the upper adhesive layer 2 is 5 μm to 10 μm; the lower adhesive layer 6 is made of one or more of polyurethane resin, polyester resin, and epoxy-modified acrylic resin; the lower adhesive layer 6 also contains a curing agent, which is one or more of isocyanate curing agent, epoxy curing agent, and aziridine curing agent; the thickness of the lower adhesive layer 6 is 20 μm to 50 μm.

[0041] Preferably, the material of the beaded adhesive layer 3 is one or a mixture of PP, PE, EVA, EBA, and EAA, and a mixture with an opening agent; the thickness of the beaded adhesive layer 3 is 25% to 35% of the diameter of the glass microspheres in the glass microsphere layer 31, and the melting point of the beaded adhesive layer 3 is below 150°C; the diameter of the glass microspheres in the glass microsphere layer 31 is 45 μm to 95 μm, and the refractive index of the glass microspheres is 1.9 to 1.95.

[0042] Preferably, the material of the focusing layer 4 is one or a mixture of polyurethane resin, polyester resin, and epoxy-modified acrylic resin, and the thickness of the focusing layer 4 is 5μm to 20μm; the material of the metal reflective layer 5 is one of aluminum, silver, and chromium.

[0043] Preferably, the material of the barrier protective layer 41 is one or a mixture of carboxyl-modified acrylic resin, silicone resin, and fluorocarbon resin; the melting point difference between the barrier protective layer 41 and the bead adhesive layer 3 is 30°C or more; and the thickness of the barrier protective layer 41 is 0.5 μm to 3 μm.

[0044] Preferably, the material of the colored layer 42 is one of modified polyurethane resin and modified polyester resin; the colored layer 42 also contains a colorant, which is an organic disperse pigment or a thermal sublimation dye; the thickness of the colored layer 42 is 10μm to 30μm.

[0045] A method for manufacturing a patterned colored reflective heat-adhesive film includes the following steps: S1: Take the base film layer 1, and form the upper adhesive layer 2 by coating on the surface of the base film layer 1. Take the beaded adhesive layer 3 and attach it to the upper adhesive layer 2. S2: A barrier protective layer 41 is formed by printing on the beaded adhesive layer 3 using an anilox roller. Then, a colored layer 42 is formed by printing on the same position using the same anilox roller. After cooling, the layer is baked by a heat source until it reaches a molten state. Glass microspheres are then implanted on the surface of the beaded adhesive layer 3 and the colored layer 42. After cooling, the surface dust is removed to obtain a glass microsphere layer 31. Then, a focusing layer 4 is formed on the glass microsphere layer 31 by extrusion coating or scraping coating. Vacuum evaporation is performed on the focusing layer 4 to form a metal reflective layer 5. S3: Apply composite adhesive to the metal reflective layer 5 to form the lower adhesive layer 6, take the substrate layer 7 and attach the lower adhesive layer 6, and finally perform curing treatment to obtain a patterned colored reflective heat-adhesive film.

[0046] The thickness of the base film layer 1 can be 50μm, 87.5μm, or 125μm; the thickness of the substrate layer 7 can be 30μm, 55μm, or 80μm; the thickness of the upper adhesive layer 2 can be 5μm, 7.5μm, or 10μm; the thickness of the lower adhesive layer 6 can be 20μm, 35μm, or 50μm; the thickness of the bead adhesive layer 3 can be 25%, 30%, or 35% of the diameter of the glass microspheres in the glass microsphere layer 31; the diameter of the glass microspheres in the glass microsphere layer 31 can be 45μm, 70μm, or 95μm; the refractive index of the glass microspheres can be 1.9, 1.925, or 1.95; the thickness of the focusing layer 4 can be 5μm, 12.5μm, or 20μm; the thickness of the barrier protective layer 41 can be 0.5μm, 1.75μm, or 3μm; and the thickness of the color layer 42 can be 10μm, 20μm, or 30μm.

[0047] Set up the following samples: Sample 1: The base film layer 1 is a corona-treated PET layer with a thickness of 125 μm. The substrate layer 7 has a thickness of 60 μm. The upper adhesive layer 2 is cured with an isocyanate curing agent and has a thickness of 5 μm. The upper adhesive layer 2 is made of polyurethane resin or polyester resin, isocyanate curing agent, and ethyl acetate in a mass ratio of 100:10:200. The lower adhesive layer 6 is made of polyurethane resin or polyester resin and is cured with an isocyanate curing agent. The lower adhesive layer 6 has a thickness of 50 μm. The lower adhesive layer 6 is made of polyurethane resin or polyester resin, isocyanate curing agent, and ethyl acetate in a mass ratio of 100:10:60. The bead adhesive layer 3 is a mixture of PE and an opening agent. The glass microspheres in the glass microsphere layer 43 have a diameter of 75 μm. The focusing layer 4 is made of epoxy-modified acrylic resin, and an epoxy curing agent may be added. The focusing layer 4 has a thickness of 5 μm. The focusing layer 4 is made of epoxy-modified acrylic resin, epoxy curing agent, and ethyl acetate in a mass ratio of 100:10:800. The metal reflective layer 5 is made of aluminum. The barrier protective layer 41 is made of silicone resin, and the melting point difference between the barrier protective layer 41 and the bead adhesive layer 3 is greater than 30°C. The barrier protective layer 41 is made of silicone resin and toluene in a mass ratio of 100:500. The color layer 42 is made of fluorinated modified polyurethane resin, and a mixture of fluorinated block copolymer and acid acid in a 1:1 ratio can be added as a curing agent. The thickness of the color layer 42 is 10 μm. The color layer 42 is made of fluorinated modified polyurethane resin, a mixture of fluorinated block copolymer and acid acid, ethyl acetate, and colorant in a mass ratio of 100:10:800:15.

[0048] The thickness of the barrier protective layer 41 is 0.2 μm.

[0049] Sample 2: The base film layer 1 is a corona-treated PET layer with a thickness of 125 μm. The substrate layer 7 has a thickness of 60 μm. The upper adhesive layer 2 is cured with an isocyanate curing agent and has a thickness of 5 μm. The upper adhesive layer 2 is made of polyurethane resin or polyester resin, isocyanate curing agent, and ethyl acetate in a mass ratio of 100:10:200. The lower adhesive layer 6 is made of polyurethane resin or polyester resin and is cured with an isocyanate curing agent. The lower adhesive layer 6 has a thickness of 50 μm. The lower adhesive layer 6 is made of polyurethane resin or polyester resin, isocyanate curing agent, and ethyl acetate in a mass ratio of 100:10:60. The bead adhesive layer 3 is a mixture of PE and an opening agent. The glass microspheres in the glass microsphere layer 43 have a diameter of 75 μm. The focusing layer 4 is made of epoxy-modified acrylic resin, and an epoxy curing agent may be added. The focusing layer 4 has a thickness of 5 μm. The focusing layer 4 is made of epoxy-modified acrylic resin, epoxy curing agent, and ethyl acetate in a mass ratio of 100:10:800. The metal reflective layer 5 is made of aluminum. The barrier protective layer 41 is made of silicone resin, and the melting point difference between the barrier protective layer 41 and the bead adhesive layer 3 is greater than 30°C. The barrier protective layer 41 is made of silicone resin and toluene in a mass ratio of 100:500. The color layer 42 is made of fluorinated modified polyurethane resin, and a mixture of fluorinated block copolymer and acid acid in a 1:1 ratio can be added as a curing agent. The color layer 42 is made of fluorinated modified polyurethane resin, a mixture of fluorinated block copolymer and acid acid, ethyl acetate, and colorant in a mass ratio of 100:10:800:15.

[0050] The thickness of the barrier protective layer 41 is 0.2 μm. The thickness of the color layer 42 is 20 μm.

[0051] Sample 3: The base film layer 1 is a corona-treated PET layer with a thickness of 125 μm. The substrate layer 7 has a thickness of 60 μm. The upper adhesive layer 2 is cured with an isocyanate curing agent and has a thickness of 5 μm. The upper adhesive layer 2 is made of polyurethane resin or polyester resin, isocyanate curing agent, and ethyl acetate in a mass ratio of 100:10:200. The lower adhesive layer 6 is made of polyurethane resin or polyester resin and is cured with an isocyanate curing agent. The lower adhesive layer 6 has a thickness of 50 μm. The lower adhesive layer 6 is made of polyurethane resin or polyester resin, isocyanate curing agent, and ethyl acetate in a mass ratio of 100:10:60. The bead adhesive layer 3 is a mixture of PE and an opening agent. The glass microspheres in the glass microsphere layer 43 have a diameter of 75 μm. The focusing layer 4 is made of epoxy-modified acrylic resin, and an epoxy curing agent may be added. The focusing layer 4 has a thickness of 5 μm. The focusing layer 4 is made of epoxy-modified acrylic resin, epoxy curing agent, and ethyl acetate in a mass ratio of 100:10:800. The metal reflective layer 5 is made of aluminum. The barrier protective layer 41 is made of silicone resin, and the melting point difference between the barrier protective layer 41 and the bead adhesive layer 3 is greater than 30°C. The color layer 42 is made of fluorinated modified polyurethane resin, and a mixture of fluorinated block copolymer and acid acid in a 1:1 ratio can be added as a curing agent. The color layer 42 is made of fluorinated modified polyurethane resin, a mixture of fluorinated block copolymer and acid acid, ethyl acetate, and colorant in a mass ratio of 100:10:800:15.

[0052] The barrier protective layer 41 has a thickness of 1.5 μm and is made of silicone resin and toluene in a mass ratio of 100:200. The colored layer 42 has a thickness of 20 μm.

[0053] Sample 4: The base film layer 1 is a corona-treated PET layer with a thickness of 125 μm. The substrate layer 7 has a thickness of 60 μm. The upper adhesive layer 2 is cured with an isocyanate curing agent and has a thickness of 5 μm. The upper adhesive layer 2 is made of polyurethane resin or polyester resin, isocyanate curing agent, and ethyl acetate in a mass ratio of 100:10:200. The lower adhesive layer 6 is made of polyurethane resin or polyester resin and is cured with an isocyanate curing agent. The lower adhesive layer 6 has a thickness of 50 μm. The lower adhesive layer 6 is made of polyurethane resin or polyester resin, isocyanate curing agent, and ethyl acetate in a mass ratio of 100:10:60. The bead adhesive layer 3 is a mixture of PE and an opening agent. The glass microspheres in the glass microsphere layer 43 have a diameter of 75 μm. The focusing layer 4 is made of epoxy-modified acrylic resin, and an epoxy curing agent may be added. The focusing layer 4 has a thickness of 5 μm. The focusing layer 4 is made of epoxy-modified acrylic resin, epoxy curing agent, and ethyl acetate in a mass ratio of 100:10:800. The metal reflective layer 5 is made of aluminum. The barrier protective layer 41 is made of silicone resin, and the melting point difference between the barrier protective layer 41 and the bead adhesive layer 3 is greater than 30°C. The color layer 42 is made of fluorinated modified polyurethane resin, and a mixture of fluorinated block copolymer and acid acid in a 1:1 ratio can be added as a curing agent. The color layer 42 is made of fluorinated modified polyurethane resin, a mixture of fluorinated block copolymer and acid acid, ethyl acetate, and colorant in a mass ratio of 100:10:800:15.

[0054] The barrier protective layer 41 has a thickness of 3 μm and is made of silicone resin and toluene in a mass ratio of 100:80. The colored layer 42 has a thickness of 20 μm.

[0055] Patterned colored reflective heat-adhesive films prepared using existing mainstream processes were selected as comparative examples.

[0056] Perform the following tests: Washing performance: According to GB 20653-2020 "Protective Clothing - Occupational High-Visibility Warning Clothing", wash at 40℃.

[0057] Test results:

[0058] Analysis conclusions: The barrier protective layer 41 of samples 1 and 2 is too thin to achieve the protective function, and the colored layer 42 is bonded to the bead adhesive layer 3, resulting in an incomplete pattern; The barrier protective layer 41 of samples 3 and 4 is improved, the protective function is enhanced and the performance is not significantly affected; Compared with the comparative example, the pattern of the sample of the present invention has better water washability and reduces the impact of migration on the corrosion of the metal reflective layer 5.

[0059] In summary, the above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be included within the scope of the present invention.

Claims

1. A patterned colored reflective heat-adhesive film, characterized in that: The base film layer (1), the upper adhesive layer (2), the beading adhesive layer (3), the focusing layer (4), the metal reflecting layer (5), the lower adhesive layer (6) and the substrate layer (7) are sequentially arranged.

2. The patterned colored reflective thermal film of claim 1, wherein: The base film layer (1) is a PET layer treated by corona or chemical treatment, and the thickness of the base film layer (1) is 50-125 μm; the material of the substrate layer (7) is one of TPU, PU, PES and PVC, and the thickness of the substrate layer (7) is 30-80 μm.

3. The patterned colored reflective thermal film of claim 1, wherein: The material of the upper adhesive layer (2) is a mixture of one or more of polyurethane resin, polyester resin and polyolefin resin; the upper adhesive layer (2) further contains a curing agent, which is a mixture of one or more of isocyanate curing agent, epoxy curing agent and aziridine curing agent; the thickness of the upper adhesive layer (2) is 5-10 μm; the material of the lower adhesive layer (6) is a mixture of one or more of polyurethane resin, polyester resin and epoxy modified acrylic resin; the lower adhesive layer (6) further contains a curing agent, which is a mixture of one or more of isocyanate curing agent, epoxy curing agent and aziridine curing agent; the thickness of the lower adhesive layer (6) is 20-50 μm.

4. The patterned colored retro-reflective heat transfer film of claim 1, wherein: The material of the beading adhesive layer (3) is a mixture of one or more of PP, PE, EVA, EBA and EAA, and a mixture with an opening agent; the thickness of the beading adhesive layer (3) is 25-35% of the diameter of the glass microspheres in the glass microsphere layer (31), and the melting point of the beading adhesive layer (3) is lower than 150 ℃; the diameter of the glass microspheres in the glass microsphere layer (31) is 45-95 μm, and the refractive index of the glass microspheres is 1.9-1.

95.

5. The patterned colored retro-reflective thermal patch film of claim 1, wherein: The material of the focusing layer (4) is a mixture of one or more of polyurethane resin, polyester resin and epoxy modified acrylic resin, and the thickness of the focusing layer (4) is 5-20 μm; the material of the metal reflecting layer (5) is one of aluminum, silver and chromium.

6. The patterned colored retro-reflective thermal patch film of claim 1, wherein: The material of the barrier protection layer (41) is a mixture of one or more of modified acrylic resin containing carboxyl group, silicone resin and fluorocarbon resin; the difference between the melting points of the barrier protection layer (41) and the beading adhesive layer (3) is more than 30 ℃; the thickness of the barrier protection layer (41) is 0.5-3 μm.

7. The patterned colored retro-reflective thermal patch film of claim 1, wherein: The material of the color layer (42) is one of modified polyurethane resin and modified polyester resin; the color layer (42) further contains a colorant, which is an organic dispersed pigment or a thermal sublimation dye; the thickness of the color layer (42) is 10-30 μm.

8. A method for manufacturing a patterned colored reflective thermal film, characterized in that: The method comprises the following steps: S1: taking the base film layer (1), forming the upper adhesive layer (2) on the surface of the base film layer (1) by coating, and bonding the beading adhesive layer (3) with the upper adhesive layer (2); S2: using a screen roller to print a barrier protection layer (41) on the beaded adhesive layer (3), and then using the same screen roller to print a color layer (42) at the same position, waiting for cooling, and then baking with a heat source, when reaching a molten state, implanting glass microspheres on the side surface of the beaded adhesive layer (3) and the color layer (42), waiting for cooling, and then removing surface dust to obtain a glass microsphere layer (31), and then forming a focusing layer (4) on the glass microsphere layer (31) by extrusion coating or blade coating, vacuum evaporation on the focusing layer (4) to form a metal reflection layer (5); S3: coating a composite adhesive on the metal reflection layer (5) to form a lower bonding layer (6), taking a substrate layer (7) to adhere to the lower bonding layer (6), and finally performing a curing treatment to obtain a patterned color reflective thermal paste film.

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