UV deep texture filling based tactile thermal transfer film and preparation method thereof

Abstract

This invention provides a tactile heat transfer film based on UV deep texture filling and its preparation method. The heat transfer film includes a substrate layer, a UV release layer, a UV imaging layer, a connecting layer, a printing layer, and an adhesive layer arranged sequentially. The UV release layer and the UV imaging layer have an interlocking uneven structure. The UV release layer comprises 23-33 parts of hyperbranched polyester modified acrylate, 15-25 parts of aromatic polyurethane acrylate, 20-30 parts of long-chain acrylate monomer, and 15-25 parts of first low-functionality acrylic acid. The UV imaging layer comprises 10-20 parts polyester acrylate, 15-25 parts polyurethane acrylate, 15-25 parts epoxy acrylate, 20-30 parts a second low-functionality acrylate monomer, 10-20 parts a high-functionality acrylate monomer, 3-5 parts a second photoinitiator, 2-5 parts nano-silica, 0.2-0.5 parts an organosilicon modifier, and 0.3-0.8 parts a leveling agent. This invention improves the tactile feel, weather resistance, adhesion, and interlayer stability of the transferred pattern.

Description

Technical Field

[0001] This invention belongs to the field of printing technology, specifically relating to a tactile heat transfer film based on UV deep texture filling and its preparation method. Background Technology

[0002] The general structure of a heat transfer film, from bottom to top, consists of a substrate layer, a release layer, an imaging layer, a printing layer, and an adhesive layer. The pattern is transferred by chemically bonding the adhesive layer to the surface of the substrate. In existing technologies, the release layer often uses silicone oil or wax coatings, forming a smooth or shallow impression, making it difficult to create a deep textured feel. This results in a monotonous surface feel after transfer, failing to meet the demands of high-end decoration for a three-dimensional tactile experience. The imaging layer often uses resin or ink, which is susceptible to wear, UV corrosion, and chemical corrosion, leading to poor weather resistance of the transferred pattern. Summary of the Invention

[0003] In view of this, the present invention provides a tactile heat transfer film based on UV deep texture filling and its preparation method, which can improve the tactile feel, weather resistance, adhesion and interlayer stability of the transferred pattern.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a tactile heat transfer film based on UV deep texture filling, comprising a substrate layer, and a UV release layer, a UV imaging layer, a bonding layer, a printing layer, and an adhesive layer sequentially disposed on the substrate layer, wherein the UV release layer and the UV imaging layer have interlocking concave-convex structures on their adjacent sides, wherein: The UV release layer comprises, by weight, 23-33 parts of hyperbranched polyester modified acrylate, 15-25 parts of aromatic polyurethane acrylate, 20-30 parts of long-chain acrylate monomer, 15-25 parts of a first low-functionality acrylate monomer, 3-6 parts of fluorinated polyether siloxane, and 3-6 parts of a first photoinitiator. The UV imaging layer comprises, by weight, 10-20 parts polyester acrylate, 15-25 parts polyurethane acrylate, 15-25 parts epoxy acrylate, 20-30 parts a second low-functionality acrylate monomer, 10-20 parts a high-functionality acrylate monomer, 3-5 parts a second photoinitiator, 2-5 parts nano-silica, 0.2-0.5 parts organosilicon modifying agent, and 0.3-0.8 parts leveling agent.

[0005] Preferably, in the UV release layer: The long-chain acrylate monomers include polyethylene glycol (600) diacrylate; and / or, The first low-functionality acrylate monomer includes at least one of dipropylene glycol diacrylate, tripropylene glycol diacrylate, and triethylene glycol diacrylate; and / or, The first photoinitiator includes 1-hydroxycyclohexylphenyl ketone.

[0006] Preferably, in the UV imaging layer: The second low-functionality acrylate monomer includes at least one selected from dipropylene glycol diacrylate, tripropylene glycol diacrylate, and triethylene glycol diacrylate; and / or, The high-functionality acrylate monomer includes at least one of dipentaerythritol penta / hexaacrylate and di-trimethylolpropane tetraacrylate; and / or The second photoinitiator comprises 1-hydroxycyclohexylphenyl ketone; and / or, The organosilicon-modifying additives include polydimethylsiloxane and polyether-modified polyacrylate.

[0007] Preferably, the components of the connecting layer, by weight, include 15-20 parts of crosslinking agent, 20-25 parts of hydroxyl acrylic resin, 10-15 parts of chloroacetic acid resin, 1-3 parts of silane coupling agent, and 30-40 parts of solvent.

[0008] Preferably, the crosslinking agent comprises a blocked isocyanate; and / or, The solvents include toluene and butanone.

[0009] Preferably, a plating layer is provided between the printed layer and the adhesive layer.

[0010] Preferably, the thickness of the coating is 30~50 nm; and / or, The coating is an aluminum coating.

[0011] Preferably, the substrate layer is a PET base film; and / or, The adhesive layer is a hot melt adhesive layer; and / or, The thickness of the substrate layer is 15~40 μm; and / or, The thickness of the UV release layer is 15~20 μm; and / or, The UV release layer has multiple grooves on one side near the UV imaging layer, each groove having a depth of 10~16 μm; and / or, The thickness of the UV imaging layer is 8~17 μm; and / or, The thickness of the connecting layer is 2~4 μm; and / or, The thickness of the printed layer is 0.8~2 μm; and / or, The thickness of the adhesive layer is 4~8 μm.

[0012] Secondly, the present invention also provides a method for preparing the tactile heat transfer film based on UV deep texture filling, comprising the following steps: S1. Provide a substrate layer; S2. Apply a UV release layer coating onto the substrate layer, imprint with deep texture, and cure to obtain a UV release layer. S3. Apply a UV imaging layer coating onto the UV release layer, UV mold, and cure to obtain the UV imaging layer; S4. Apply a bonding layer coating to the UV imaging layer and cure it to obtain the bonding layer; S5. At least a printing layer and an adhesive layer are formed sequentially on the connecting layer to obtain a tactile heat transfer film based on UV deep texture filling.

[0013] Preferably, a plating layer is provided between the printed layer and the adhesive layer. Step S5 includes: forming a printed layer, a plating layer and an adhesive layer sequentially on the connecting layer to obtain a tactile heat transfer film based on UV deep texture filling.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: In this invention, the UV release layer can be deeply textured and imprinted after the coating is applied to the substrate layer to form a groove structure. The UV release layer has moderate peel strength and adhesion to the substrate layer. The UV imaging layer can fill and cover the groove structure of the UV release layer when the coating is applied to it, forming a raised structure. After the adhesive layer is bonded to the surface of the substrate, the substrate layer and the UV release layer are peeled off. The surface of the UV imaging layer with the raised structure is located on the surface of the substrate, presenting a three-dimensional effect and clear tactile feel. The UV imaging layer has high transparency, good flexibility, chemical resistance, and abrasion resistance. A connecting layer is set between the UV imaging layer and the printing layer to improve the bonding strength between the UV imaging layer and the printing layer. This improves the tactile feel, weather resistance, adhesion, and interlayer stability of the transferred pattern, and also facilitates the peeling of the substrate layer and the UV release layer. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment of the tactile heat transfer film based on UV deep texture filling provided by the present invention; Figure 2 This is a process flow diagram of an embodiment of the preparation method of the tactile heat transfer film based on UV deep texture filling provided by the present invention; Figure 3 This is a schematic diagram of the structure of the tactile heat transfer film based on UV deep texture filling provided by the present invention when it is bonded to glass and the substrate layer and UV release layer are peeled off.

[0016] Explanation of reference numerals in the attached figures: 101. Substrate layer; 102. UV release layer; 103. UV imaging layer; 104. Connecting layer; 105. Printing layer; 106. Coating layer; 107. Adhesive layer; 201. Glass bottle. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to specific embodiments, so that those skilled in the art can more clearly understand the present invention.

[0018] Firstly, please refer to Figure 1 This invention provides a tactile heat transfer film based on UV deep texture filling, comprising a substrate layer 101, and a UV release layer 102, a UV imaging layer 103, a connecting layer 104, a printing layer 105, and an adhesive layer 107 sequentially disposed on the substrate layer 101. The UV release layer 102 and the UV imaging layer 103 have interlocking concave-convex structures on their adjacent sides. The UV release layer 102 comprises, by weight, 23-33 parts of hyperbranched polyester modified acrylate, 15-25 parts of aromatic polyurethane acrylate, 20-30 parts of long-chain acrylate monomer, 15-25 parts of a first low-functionality acrylate monomer, 3-6 parts of fluorinated polyether siloxane, and 3-6 parts of a first photoinitiator. The UV imaging layer 103 comprises, by weight, 10-20 parts polyester acrylate, 15-25 parts polyurethane acrylate, 15-25 parts epoxy acrylate, 20-30 parts a second low-functionality acrylate monomer, 10-20 parts a high-functionality acrylate monomer, 3-5 parts a second photoinitiator, 2-5 parts nano-silica, 0.2-0.5 parts organosilicon modifying agent, and 0.3-0.8 parts leveling agent.

[0019] In this invention, the UV release layer 102 can be deeply textured and imprinted after the coating is applied to the substrate layer 101 to form a groove structure. The UV release layer 102 also possesses moderate peel strength and adhesion to the substrate layer 101. The UV imaging layer 103 can fill and cover the groove structure of the UV release layer 102 when the coating is applied to it, forming a raised structure. After the adhesive layer 107 is bonded to the surface of the substrate, the substrate layer 101 and the UV release layer 102 are peeled off, and the UV imaging layer 103... 03 The surface with raised structure is located on the surface of the substrate, presenting a three-dimensional effect and clear tactile feel. The UV imaging layer 103 has high transparency, good flexibility, chemical resistance and abrasion resistance. A connecting layer 104 is provided between the UV imaging layer 103 and the printing layer 105, which can improve the bonding strength between the UV imaging layer 103 and the printing layer 105. This can improve the tactile feel, weather resistance, adhesion and interlayer stability of the transferred pattern. The substrate layer 101 and the UV release layer 102 are also easy to peel off.

[0020] Understandably, the substrate layer 101, as the supporting carrier of the heat transfer film, needs to have good mechanical strength and dimensional stability, and good adhesion to the UV release layer 102; the UV imaging layer 103 can be UV molded to imprint a holographic texture structure on the surface, forming an integrated structure of "texture-holography-protective layer"; the connecting layer 104 needs to have high transparency; the printing layer 105 is used to present decorative patterns and visual effects, and can be printed using gravure printing or screen printing technology to form various colored patterns, logos and other decorative patterns on the connecting layer 104. In order to increase the anti-counterfeiting function of the product, photochromic ink can also be added to the printing layer 105.

[0021] In some embodiments, the long-chain acrylate monomer includes polyethylene glycol (600) diacrylate (PEG600DA).

[0022] In some embodiments, the first low-functionality acrylate monomer includes at least one of dipropylene glycol diacrylate, tripropylene glycol diacrylate, and triethylene glycol diacrylate.

[0023] In some embodiments, the first photoinitiator comprises 1-hydroxycyclohexylphenyl ketone.

[0024] In some embodiments, the second low-functionality acrylate monomer includes at least one of dipropylene glycol diacrylate, tripropylene glycol diacrylate, and triethylene glycol diacrylate.

[0025] In some embodiments, the high-functionality acrylate monomer includes at least one of pentaerythritol penta / hexaacrylate and di-trimethylolpropane tetraacrylate.

[0026] In some embodiments, the second photoinitiator comprises 1-hydroxycyclohexylphenyl ketone.

[0027] In some embodiments, the organosilicon-modifying agent includes polydimethylsiloxane and polyether-modified polyacrylate.

[0028] In some embodiments, the components of the connecting layer 104, by weight, include 15-20 parts of crosslinking agent, 20-25 parts of hydroxyl acrylic resin, 10-15 parts of chloroacetic acid resin, 1-3 parts of silane coupling agent, and 30-40 parts of solvent.

[0029] In some embodiments, the crosslinking agent comprises a blocked isocyanate.

[0030] In some embodiments, the solvent includes toluene and butanone.

[0031] In some embodiments, a plating layer 106 is disposed between the printed layer 105 and the adhesive layer 107. By disposing of the plating layer 106 on the printed layer 105, a metallic texture effect can be achieved. According to design requirements, a portion of the plating layer 106 can be removed, creating a unique visual metallic effect with a hollowed-out appearance. Through the UV imaging layer 103, the connecting layer 104, the printed layer 105, and the plating layer 106, multiple functions such as three-dimensional tactile sensation, holographic anti-counterfeiting texture, metallic texture, and high-definition patterns can be superimposed, meeting the combined needs of high-end decoration and anti-counterfeiting.

[0032] In some embodiments, the thickness of the coating 106 is 30~50 nm.

[0033] In some embodiments, the coating 106 is an aluminum coating.

[0034] In some embodiments, the substrate layer 101 is a PET base film. It should be noted that the PET base film can be Lucky PG22A or Fuwei FC512 PET base film.

[0035] In some embodiments, the adhesive layer 107 is a hot melt adhesive layer.

[0036] In some embodiments, the thickness of the substrate layer 101 is 15~40 μm.

[0037] In some embodiments, the thickness of the UV release layer 102 is 15~20 μm.

[0038] In some embodiments, the UV release layer 102 has a plurality of grooves on one side near the UV imaging layer 103, and the depth of each groove is 10~16 μm.

[0039] In some embodiments, the thickness of the UV imaging layer 103 is 8~17 μm.

[0040] In some embodiments, the thickness of the connecting layer 104 is 2~4 μm.

[0041] In some embodiments, the thickness of the printed layer 105 is 0.8~2 μm.

[0042] In some embodiments, the thickness of the adhesive layer 107 is 4~8 μm.

[0043] Secondly, please refer to Figure 2 The present invention also provides a method for preparing the tactile heat transfer film based on UV deep texture filling, comprising the following steps: S1. Provide a substrate layer 101; S2. Apply UV release layer 102 coating onto the substrate layer 101, emboss with deep texture, and cure to obtain UV release layer 102. S3. Apply UV imaging layer 103 coating onto the UV release layer 102, UV mold, and cure to obtain UV imaging layer 103. S4. Apply the coating of the connecting layer 104 to the UV imaging layer 103 and cure it to obtain the connecting layer 104. S5. At least a printing layer 105 and an adhesive layer 107 are formed sequentially on the connecting layer 104 to obtain a tactile heat transfer film based on UV deep texture filling.

[0044] It should be noted that the components of the UV release layer 102 coating, by weight, include 23-33 parts of hyperbranched polyester modified acrylate, 15-25 parts of aromatic polyurethane acrylate, 20-30 parts of long-chain acrylate monomer, 15-25 parts of a first low-functionality acrylate monomer, 3-6 parts of fluorinated polyether siloxane, and 3-6 parts of a first photoinitiator; the components of the UV imaging layer 103 coating, by weight, include 10-20 parts of polyester acrylate, 15-25 parts of polyurethane acrylate, 15-25 parts of epoxy acrylate, 20-30 parts of a second low-functionality acrylate monomer, 10-20 parts of a high-functionality acrylate monomer, 3-5 parts of a second photoinitiator, 2-5 parts of nano-silica, 0.2-0.5 parts of organosilicon modifying agent, and 0.3-0.8 parts of leveling agent.

[0045] In some embodiments, the components of the coating of the connecting layer 104, by weight, include 15-20 parts of crosslinking agent, 20-25 parts of hydroxyl acrylic resin, 10-15 parts of chloroacetic acid resin, 1-3 parts of silane coupling agent, and 30-40 parts of solvent.

[0046] In some embodiments, a plating layer 106 is provided between the printed layer 105 and the adhesive layer 107. Step S5 includes: sequentially forming the printed layer 105, the plating layer 106 and the adhesive layer 107 on the connecting layer 104 to obtain a tactile heat transfer film based on UV deep texture filling.

[0047] In some embodiments, the method for preparing the tactile heat transfer film based on UV deep texture filling includes the following steps: 1) Substrate preparation: Select PET film with a thickness of 15~40 μm as the substrate and perform corona treatment on the surface to make its surface tension reach 48~52 dyn / cm; 2) UV Release Layer 102 Coating, Deep Texture Imprinting and Curing: The UV release layer 102 coating is applied to the PET base film using a micro-gravure coating method, with the coating thickness controlled at 15~20 μm. Then, a deep texture roller (texture depth 15~25 μm) is used to imprint a deep textured feel onto the surface of the UV release layer 102. Finally, a coating with a strength of 300~500 mJ / cm is applied. 2 Curing is performed using ultraviolet light; 3) UV Imaging Layer 103 Coating, UV Molding, and Curing: The UV imaging layer 103 coating is applied to the UV release layer 102 with a deep textured feel using a micro-recessed coating method, filling the textured grooves of the UV release layer 102. The coating thickness is controlled at 8~17μm. Then, a holographic texture is imprinted on the surface of the UV imaging layer 103 using a UV molding method, followed by curing with a strength of 300~500 mJ / cm. 2 Curing is performed using ultraviolet light; 4) Coating and curing of the bonding layer 104: The coating of the bonding layer 104 is applied to the UV imaging layer 103 using an anilox roller, with a coating amount of 2~4 g / m². 2 Curing is carried out under drying conditions at 100~120℃; 5) Printed layer 105: Decorative patterns are printed on the connecting layer 104 using gravure printing technology, with a thickness of 0.8~2 μm; 6) Aluminum plating: A 30-50 nm thick aluminum layer is deposited on the surface of the printed layer 105 using vacuum aluminum plating technology, and some of the aluminum layer is washed according to the product design to form a hollow pattern. 7) Adhesive layer 107 coating and curing: Hot melt adhesive is applied to the aluminum layer surface using a micro-gravure coating method, with a coating amount of 4~6 g / m². 2 The hot melt adhesive is cured under drying conditions of 90~110℃; 8) Winding and slitting: Wind up the finished film and slit it according to the required specifications.

[0048] The raw materials used in the following examples and comparative examples are sourced from the following sources: Sartoma CN2302 was used for hyperbranched polyester modified acrylate; Sartoma CN9782 was used for aromatic polyurethane acrylate; Bolde BD-3365F-5 was used for fluorinated polyether modified siloxane; Sartoma CN8010 was used for polyester acrylate; Changxing Chemical DR-U120 was used for polyurethane acrylate; Sartoma CN120NS was used for epoxy acrylate; BYK-3558 was used for organosilicon modifying agent; BYK-361N was used for leveling agent; BASF IRG 184 was used for photoinitiator; Lanxess Trixene BI 7951 was used for crosslinking agent; Mitsubishi Rayon A-567 was used for hydroxyl acrylic resin; Dow Chemical VAGH was used for chloroacetic acid resin; and Momentive A-187 was used for silane coupling agent.

[0049] Example 1 A tactile heat transfer film based on UV deep texture filling is prepared by the following steps: 1) Use 23 μm thick PET base film of model FC512 and perform corona treatment on the surface of the base film to make its surface tension reach more than 48 dyn / cm; 2) A UV release layer 102 coating is applied to the corona-treated PET base film using a micro-gravure coating method, with a coating thickness of 15 μm. Then, a deep texture roller with a texture depth of 18 μm is used to emboss the surface, creating a raised texture to a depth of 12 μm. Finally, a coating with a strength of 450 mJ / cm² is applied. 2 The ultraviolet light cures the coating to obtain a UV release layer 102 with a textured surface; The preparation of UV release layer 102 coating (raw materials by weight): Weigh 12 parts of tripropylene glycol diacrylate, 6 parts of dipropylene glycol diacrylate, add 4 parts of photoinitiator, stir evenly, then add 24 parts of polyethylene glycol (600) diacrylate, stir evenly, then add 28 parts of hyperbranched polyester modified acrylate and 22 parts of aromatic polyurethane acrylate in sequence. Stir evenly after each prepolymer is added, and finally add 4 parts of fluorinated polyether siloxane, stir until evenly dispersed, and let the coating stand until clear and transparent before using it on the machine. 3) The UV imaging layer 103 coating is applied to the surface of the UV release layer 102 using a micro-recessed coating method to fill the grooves of the UV release layer 102. The coating thickness is 12 μm. Then, a holographic texture is imprinted on the coating surface using a UV molding method, and then 350 mJ / cm² is applied. 2 The ultraviolet light cures the coating to obtain the UV imaging layer 103; The preparation of UV imaging layer 103 coating (raw materials by weight): Weigh 22 parts of triethylene glycol diacrylate, add 4 parts of photoinitiator, stir evenly, then add 14 parts of di-trimethylolpropane tetraacrylate, stir evenly, then add 16 parts of polyester acrylate, 21 parts of polyurethane acrylate, and 20 parts of epoxy acrylate in sequence. Stir evenly after each prepolymer is added, and finally add 3 parts of nano silica, 0.3 parts of organosilicon modifier, and 0.5 parts of leveling agent. Disperse and stir at high speed until the nanoparticles are evenly dispersed. Let the coating stand until it is clear and transparent before using it on the machine. 4) Apply the coating of the bonding layer 104 to the surface of the UV imaging layer 103 using an anilox roller, with a coating thickness of 2 μm. Cur the coating at a drying tunnel temperature of 90-100-120-120-110-90℃ to obtain the bonding layer 104. The preparation of the 104 coating for the connecting layer (raw materials in parts by weight) is as follows: 16 parts of crosslinking agent, 20 parts of hydroxyl acrylic resin, 12 parts of chloroacetic acid resin, 50 parts of toluene:butanone (volume ratio 1:1) mixed solvent, and 2 parts of silane coupling agent are weighed and stirred evenly to obtain the 104 coating for the connecting layer. 5) A decorative pattern is printed on the surface of the connecting layer 104 using gravure printing technology to obtain the printed layer 105; 6) Vacuum aluminum plating with a thickness of 35 nm is performed on the surface of the printed layer 105 to obtain an aluminum plating layer. Then, a portion of the aluminum layer is washed to form a hollow visual effect. 7) A hot melt adhesive layer is coated and formed on the surface of the aluminum-plated layer by an anilox roller, with a coating thickness of 6 μm, to obtain a tactile heat transfer film based on UV deep texture filling.

[0050] Example 2 A tactile heat transfer film based on UV deep texture filling is prepared in a manner that is basically the same as in Example 1, except that in step 1), the thickness of the PET base film is 35 μm; in step 2), the coating thickness of the UV release layer 102 is 20 μm and the imprinting depth is 15 μm; in step 3), the coating thickness of the UV imaging layer 103 is 15 μm; and in step 7), the coating thickness of the hot melt adhesive layer 107 is 8 μm.

[0051] Comparative Example 1 A traditional heat transfer film consists of, from bottom to top, a PET base film, a wax release layer, an imaging layer, a printing layer, an aluminum plating layer, and a hot melt adhesive layer. The wax release layer does not have a deep texture imprinting function.

[0052] Comparative Example 2 A tactile heat transfer film based on UV deep texture filling is prepared in a manner that is basically the same as in Example 1, except that step 4 is not performed and there is no connecting layer 104 between the UV imaging layer 103 and the printing layer 105.

[0053] Comparative Example 3 A tactile heat transfer film based on UV deep texture filling is prepared in a manner that is basically the same as in Example 1, except that no nano-silica or organosilicon modifiers are added in the preparation of the UV imaging layer 103 coating.

[0054] Performance Tests and Results The tactile heat transfer films based on UV deep texture filling obtained in Examples 1-2 and Comparative Examples 1-3 were transferred onto the surface of a glass bottle 201 preheated to 80°C using a heat transfer machine under conditions of 180°C, 0.6 MPa, and 3 seconds. Then, the release film (composed of substrate layer 101 and UV release layer 102) was removed, leaving the UV imaging layer 103 on the outermost surface. Figure 3As shown.

[0055] The following performance tests were then performed on the transferred pattern: 1) UV release layer 102 peeling performance: After the heat transfer is completed, the separation effect between the UV release layer 102 and the UV imaging layer 103 is evaluated by the peeling performance of the release film. 2) Surface tactile effect: Evaluate the surface texture through finger touch. 3) Initial adhesion: Test whether the transferred pattern can be peeled off using 3M 600# tape; 4) Interlayer adhesion: Perform a cross-cut adhesion test on the surface according to GB / T 9286 or ASTM D3359 standards to evaluate the interlayer adhesion; 5) Abrasion resistance: Using an eraser tip and a 500g load, rub the transferred pattern surface back and forth 2000 times and observe whether there is any wear or exposure of the base material. 6) Alcohol resistance: Immerse the heat-transfer glass bottle in industrial alcohol (95% purity) for 2 hours, remove it and blot the alcohol off the surface with filter paper, and immediately observe for any defects in appearance. The adhesion rating criteria are shown in Table 1, and the test results are shown in Table 2.

[0056] Table 1 Adhesion Grade Evaluation Criteria

[0057] Table 2 Performance test results of the heat transfer films obtained in each embodiment and comparative example

[0058] As can be seen from Table 2, the overall performance of the UV deep texture-filled tactile heat transfer film of Examples 1-2 is better than that of the heat transfer film of Comparative Examples 1-3. The UV deep texture-filled tactile heat transfer film provided by the present invention can improve the tactile feel, weather resistance, adhesion and interlayer stability of the transferred pattern, and has good adhesion to glass. The substrate layer and UV release layer are also easy to peel off.

[0059] Unless otherwise specified, all raw materials used in this invention are existing substances that can be purchased directly from the market.

[0060] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A tactile heat transfer film based on UV deep texture filling, characterized in that, It includes a substrate layer, and a UV release layer, a UV imaging layer, a bonding layer, a printing layer, and an adhesive layer sequentially disposed on the substrate layer. The UV release layer and the UV imaging layer have interlocking uneven structures on their two sides, wherein: The UV release layer comprises, by weight, 23-33 parts of hyperbranched polyester modified acrylate, 15-25 parts of aromatic polyurethane acrylate, 20-30 parts of long-chain acrylate monomer, 15-25 parts of a first low-functionality acrylate monomer, 3-6 parts of fluorinated polyether siloxane, and 3-6 parts of a first photoinitiator. The UV imaging layer comprises, by weight, 10-20 parts polyester acrylate, 15-25 parts polyurethane acrylate, 15-25 parts epoxy acrylate, 20-30 parts a second low-functionality acrylate monomer, 10-20 parts a high-functionality acrylate monomer, 3-5 parts a second photoinitiator, 2-5 parts nano-silica, 0.2-0.5 parts organosilicon modifying agent, and 0.3-0.8 parts leveling agent.

2. The tactile heat transfer film based on UV deep texture filling according to claim 1, characterized in that, In the UV release layer: The long-chain acrylate monomers include polyethylene glycol (600) diacrylate; and / or, The first low-functionality acrylate monomer includes at least one of dipropylene glycol diacrylate, tripropylene glycol diacrylate, and triethylene glycol diacrylate; and / or, The first photoinitiator includes 1-hydroxycyclohexylphenyl ketone.

3. The tactile heat transfer film based on UV deep texture filling according to claim 1, characterized in that, In the UV imaging layer: The second low-functionality acrylate monomer includes at least one selected from dipropylene glycol diacrylate, tripropylene glycol diacrylate, and triethylene glycol diacrylate; and / or, The high-functionality acrylate monomer includes at least one of dipentaerythritol penta / hexaacrylate and di-trimethylolpropane tetraacrylate; and / or The second photoinitiator comprises 1-hydroxycyclohexylphenyl ketone; and / or, The organosilicon-modifying additives include polydimethylsiloxane and polyether-modified polyacrylate.

4. The tactile heat transfer film based on UV deep texture filling according to claim 1, characterized in that, The components of the connecting layer, by weight, include 15-20 parts of crosslinking agent, 20-25 parts of hydroxyl acrylic resin, 10-15 parts of chloroacetic acid resin, 1-3 parts of silane coupling agent, and 30-40 parts of solvent.

5. The tactile heat transfer film based on UV deep texture filling according to claim 4, characterized in that, The bridging agent includes a blocked isocyanate; and / or, The solvents include toluene and butanone.

6. The tactile heat transfer film based on UV deep texture filling according to claim 1, characterized in that, A plating layer is provided between the printed layer and the adhesive layer.

7. The tactile heat transfer film based on UV deep texture filling according to claim 6, characterized in that, The thickness of the coating is 30~50 nm; and / or, The coating is an aluminum coating.

8. The tactile heat transfer film based on UV deep texture filling according to claim 1, characterized in that, The substrate layer is a PET base film; and / or, The adhesive layer is a hot melt adhesive layer; and / or, The thickness of the substrate layer is 15~40 μm; and / or, The thickness of the UV release layer is 15~20 μm; And / or, The UV release layer has multiple grooves on one side near the UV imaging layer, each groove having a depth of 10~16μm; and / or, The thickness of the UV imaging layer is 8~17 μm; and / or, The thickness of the connecting layer is 2~4 μm; and / or, The thickness of the printed layer is 0.8~2 μm; and / or, The thickness of the adhesive layer is 4~8 μm.

9. The method for preparing a tactile heat transfer film based on UV deep texture filling according to any one of claims 1 to 8, characterized in that, Includes the following steps: S1. Provide a substrate layer; S2. Apply a UV release layer coating onto the substrate layer, imprint with deep texture, and cure to obtain a UV release layer. S3. Apply a UV imaging layer coating onto the UV release layer, UV mold, and cure to obtain the UV imaging layer; S4. Apply a bonding layer coating to the UV imaging layer and cure it to obtain the bonding layer; S5. At least a printing layer and an adhesive layer are formed sequentially on the connecting layer to obtain a tactile heat transfer film based on UV deep texture filling.

10. The method for preparing a tactile thermal transfer film based on UV deep texture filling according to claim 9, characterized in that, A plating layer is disposed between the printed layer and the adhesive layer. Step S5 includes: forming a printed layer, a plating layer and an adhesive layer sequentially on the connecting layer to obtain a tactile heat transfer film based on UV deep texture filling.

Images