Metallic-feeling non-inductive identification heat transfer film and preparation method thereof

Abstract

This invention belongs to the field of hot stamping materials technology, specifically relating to a metallic-textured, non-intrusive heat transfer film for labeling. Its structure consists of a heat-resistant coating on one side of a base film, and a metallic color layer and an ink-absorbing layer sequentially coated on the other side of the base film from the inside out. In use, the relevant information is edited using a computer and then the pigment paste is sprayed onto the heat transfer film using a digital printing machine. After drying, it is heated using a hot stamping machine, and the metallic color layer, ink-absorbing layer, and the information it carries are transferred together onto substrates such as polyester, spandex, silk, and nylon. Non-intrusive labels prepared using this method are simple, efficient, have high wash fastness, and offer significant cost advantages.

Description

Technical Field

[0001] This invention belongs to the field of heat transfer film material technology, specifically relating to a heat transfer film for metallic-textured non-intrusive marking and its preparation method. Background Technology

[0002] Heat transfer film utilizes the combined effects of heat and pressure to separate the protective layer and pattern layer from the polyester substrate, and then permanently bonds the entire decorative layer to the substrate using hot melt adhesive. Under heat and pressure, the heat transfer film can firmly transfer onto the surface of the substrate, forming a high-quality finish that is wear-resistant, heat-resistant, and light-resistant. Heat transfer film has wide applications in various fields such as clothing and home furnishings. The global heat transfer film market has grown rapidly in the past few years and is expected to continue to grow. Against the backdrop of increasing global environmental awareness, and with technological advancements, the heat transfer film industry is also undergoing technological upgrades and innovations, actively exploring paths to environmental protection and sustainable development.

[0003] In existing technologies, heat transfer films offer advantages such as excellent decorative effects, wide applicability, and personalization and diversity. However, they also have disadvantages such as complex processes, high costs, high surface hardness of the transferred pattern, and poor breathability. Therefore, heat transfer films can solve these problems for metallic-textured, non-invisible signage.

[0004] Based on this, this application was developed. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a heat transfer film for metallic-textured, non-intrusive signage. This product is a special heat transfer material that combines the visual effect of metallic texture with the characteristics of non-intrusive signage. It can achieve the advantages of high-quality decorative effect, personalization and diversity. The signage has a smooth touch and no abruptness. In addition, during the drying process, the high temperature causes the resin microcapsules to rupture, and the resin inside the microcapsules migrates to the top of the pattern, which plays a bonding role during the hot pressing process. The whole process does not require powder shaking, which is simple and efficient. It also has high water wash fastness and obvious cost advantages.

[0006] The present invention also provides a method for preparing the above-mentioned heat transfer film for metallic-textured non-intrusive marking.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A heat transfer film for metallic-textured, non-intrusive signage includes a heat transfer film with a metallic color layer and an ink-absorbing layer. The heat transfer film comprises a base film, a heat-resistant layer disposed on one side of the base film, and a metallic color layer and an ink-absorbing layer disposed sequentially from the inside out on the other side of the base film. In use, the relevant information is edited using a computer and then the pigment paste is sprayed onto the heat transfer film using a digital printing machine. After drying, it is heated using a heat press and transferred to a substrate such as polyester, spandex, silk, or nylon through the metallic color layer, the ink-absorbing layer, and the information it carries. Non-intrusive signs prepared using this method are simple and efficient, have a metallic texture, high wash fastness, and significant cost advantages.

[0008] Specifically, by mass percentage, the proportions of the raw materials in the heat-resistant layer are: 80-88% water-based polyester modified silicone resin, 5-10% curing agent, and 5-10% water-based leveling agent.

[0009] Furthermore, by mass percentage, the proportions of each raw material in the metallic color layer are as follows: metallic pigment 30-60%, VAE emulsion 20-30%, polyethylene wax emulsion 5-30%, aqueous dispersant 2-5%, and wetting agent 5-10%.

[0010] Specifically, by mass percentage, the proportions of each raw material in the ink-absorbing layer are as follows: 20-25% waterborne polyurethane resin, 10-15% hydrophilic fumed silica, 10-20% waterborne polyethylene micronized wax, 5-10% metallic pigment, 5-10% amino resin, 10-20% epoxy resin microcapsule powder, 20-25% polyurethane powder, 3-10% fixing agent, 1-5% wetting and dispersing agent, and 2-5% leveling agent.

[0011] Furthermore, the thickness of the heat-resistant layer is <0.1μm, which is too thin to be easily detected and can be ignored. The thickness of the metallic color layer is 1-2μm. The thickness of the ink-absorbing layer is 1-2μm. The thickness of the base film is 12±0.5μm. The total thickness of the heat transfer film is 14-16μm.

[0012] This invention provides a method for preparing the above-mentioned metallic-textured, non-intrusive thermal transfer film for marking, which includes the following steps: (1) Prepare a heat-resistant layer on one side of the base film. Specifically, by mass ratio, the ratio of distilled water to (water-based polyester modified silicone resin + curing agent + water-based leveling agent) is 80-85: (15-20) (that is, the ratio of the sum of the mass of distilled water and the heat-resistant layer raw materials, the same below). Dilute and mix the water-based polyester modified silicone resin, curing agent and leveling agent with distilled water, and then coat it evenly on one side of the base film. After drying at 120℃-130℃, it becomes the heat-resistant layer. (2) Prepare a metallic color layer on the other side of the base film obtained in step (1). Specifically, by mass ratio, the ratio of distilled water:isopropanol:(VAE emulsion + polyethylene wax emulsion + aqueous dispersant + wetting agent + metallic pigment) = 20-30:25:(45-55) (i.e., the ratio of the sum of the mass of distilled water, isopropanol and metallic color layer raw materials). Mix the VAE emulsion and polyethylene wax emulsion with distilled water and isopropanol, then add aqueous dispersant, wetting agent and metallic pigment, disperse and grind, and then evenly coat it on the other side of the base film. After drying at 130-150℃, it becomes the metallic color layer. (3) Prepare an ink-absorbing layer on the surface of the metallic color layer prepared in step (2); specifically, by mass ratio, the ratio of distilled water to (aqueous polyurethane resin + hydrophilic fumed silica + aqueous polyethylene micron wax + metallic pigment + amino resin + epoxy resin microcapsule powder + polyurethane powder + fixing agent + wetting and dispersing agent + leveling agent) is 40-45: (55-60) (that is, the ratio of the sum of the mass of distilled water and the raw materials of the ink-absorbing layer). After mixing the aqueous polyurethane resin and amino resin with distilled water, add hydrophilic fumed silica, aqueous polyethylene micron wax, metallic pigment, epoxy resin microcapsule powder, polyurethane powder, fixing agent, wetting and dispersing agent and leveling agent, disperse and grind, and then uniformly coat it on the surface of the metallic color layer. Dry it at 120-130℃ to obtain the ink-absorbing layer.

[0013] When using the metallic-textured non-intrusive signage heat transfer film of this invention, the effective information is edited using a computer and then the pigment paste is sprayed onto the heat transfer film using a digital printing machine. After drying, it is heated by a hot stamping machine and transferred to a substrate such as polyester, spandex, silk, or nylon along with the metallic color layer and the ink-absorbing layer. During the transfer process, the heat-resistant layer ensures that the heat transfer film does not deform during the high-temperature transfer process, achieving clear pattern transfer. At the same time, the metallic color layer is transferred to the pattern surface along with the information it carries, giving the pattern a metallic luster. The resin microcapsules in the ink-absorbing layer rupture under high pressure, and the polyurethane powder melts at high temperature, penetrating the pigment layer, so that the transferred information adheres firmly to the substrate. The non-intrusive signage prepared using this method is simple and efficient, has a metallic texture, high water wash fastness, and has significant cost advantages.

[0014] Compared with the prior art, the present invention has the following beneficial effects: This invention imparts a metallic sheen to the substrate after heat transfer, enhancing the product's visual quality while maintaining a smooth, seamless surface that won't cause user discomfort or affect the product's overall aesthetics. The metallic-textured, non-invasive heat transfer label film typically possesses good abrasion resistance and durability, withstanding daily friction and wear while maintaining the clarity and gloss of the design. Furthermore, the metallic-textured, non-invasive label heat transfer film is made from non-toxic, water-based materials, meeting environmental protection requirements. After the label is hot-stamped onto the substrate, its imprint exhibits excellent adhesion, washability, colorfastness to rubbing, and ironing resistance. Color fastness to washing was tested under different conditions. The metallic-textured, non-removable labeling heat transfer film provided by this invention exhibits a water wash fastness ≥4 grade (determined by using color cards and color change charts). Rubbing fastness testing showed that the film's rubbing fastness is >4 grade (determined by using color cards and color change charts). Heat pressure testing showed that the product can withstand temperatures up to 200℃. Furthermore, the metallic-textured, non-removable labeling heat transfer film has a suitable structural design, mature production process, and simple preparation method, making it easy to promote and apply. Therefore, this invention has good practical value and significant potential for widespread application. Detailed Implementation

[0015] The present invention will be further explained and illustrated below with reference to the embodiments, but the scope of protection of the present invention is not limited thereto.

[0016] Before introducing specific embodiments, the performance of some materials in the following embodiments will be briefly described below.

[0017] The base film can be a high-strength, high-temperature resistant PET polyester film with a thickness of 12±0.5μm, a heat distortion temperature ≥165℃, a tensile strength of not less than 320MPa, and a surface tension ≥42 dynes. BOPET electrical insulation film with a thickness of 12μm from Anhui Guofeng New Material Co., Ltd. is selected.

[0018] The waterborne polyester modified silicone resin has the following performance requirements: temperature resistance up to 800℃, pH of 8.5, low-temperature film formation, and viscosity (cps) <100. P-135 high-temperature resistant waterborne polyester modified silicone resin from Guangzhou Zhongtuli New Material Technology Co., Ltd. is selected.

[0019] Curing agent performance requirements: NCO content 12±0.5%, viscosity (25℃, mPa.s) between 1000-4000, unsealing temperature ≥120℃, and the closed-type curing agent JX-620 from Dongguan Jiangxing Industrial Co., Ltd. should be selected.

[0020] The performance requirements for metallic pigments are: medium particle size D50 of 6-10, and aluminum silver paste WF969, 1200 mesh lapis lazuli paste, and 1200 mesh red gold paste from Suzhou Boka Metallic Pigment Co., Ltd.

[0021] The VAE emulsion has the following performance requirements: particle size ≤2μm, dilution stability ≤3.5%, pH value 4.0-6.5, ethylene content ≥15.3%, and viscosity (25℃, mPa.s) between 2500-3500. The VAE emulsion GW-706 from Guangxi Guangwei Chemical Co., Ltd. is selected.

[0022] The performance requirements for the polyethylene wax emulsion are: melting point 125-140℃, pH value 3-6, solid content 29-31%, and the selected product is oxidized polyethylene wax emulsion OE-6501C from Nanjing Tianshi New Material Technology Co., Ltd.

[0023] The waterborne polyurethane resin has the following performance requirements: pH value 6-9, viscosity (25℃, mPa.s) > 100, elongation 1000-3000%, and the selected waterborne polyurethane resin is AH-1605B from Anhui Anda Huatai New Materials Co., Ltd.

[0024] The hydrophilic fumed silica has the following performance requirements: density (25 °C) 2.3 g / ml, particle size 7-40 nm, specific surface area 120 m² / g, and is selected from the hydrophilic fumed silica S818465 of McLean reagent.

[0025] Water-based polyethylene micronized wax, with the following performance requirements: D50 particle size of 6.0-7.5μm, melting point >130℃, Honeywell's micronized polyethylene wax ACumist A-6 is selected.

[0026] The performance requirements for the amino resin are: monomer content > 60%, viscosity (25℃) between 1000-2000 mPa.s, and the selected amino resin is CYMEL 385 from the USA.

[0027] The performance requirements for epoxy resin microcapsule powder are: particle size <30μm, microcapsule rupture under pressure exceeding 0.2MPa, and XB-40 from Xinxiang Xinli Industrial Co., Ltd. is selected.

[0028] Polyurethane powder, performance requirements: softening point > 120℃, particle size < 10μm, complete melting at 150℃, water-resistant, using 2000 mesh TPU powder from Dongguan Tiannuo Plastic Raw Materials Co., Ltd.

[0029] In the following embodiments, the curing agent is JX-620, a closed-type curing agent from Dongguan Jiangxing Industrial Co., Ltd.; the water-based leveling agent is AD-88, a water-based leveling agent from Dongguan Aide Synthetic Materials Co., Ltd.; the water-based dispersant is P-19, a water-based pigment dispersant from Shanghai Changfeng Chemical Co., Ltd.; the wetting agent is AD-53, a water-based wetting agent from Aide Synthetic Materials; the fixing agent is Goon 722, a fixing agent from Dongguan Jiahong Organosilicon Technology Co., Ltd.; the wetting and dispersing agent is ANTI-TERRA-210, a wetting and dispersing agent from BYK Chemical Co., Ltd.; and the leveling agent is BYK-3499, a leveling agent from BYK Chemical Co., Ltd.

[0030] Example 1 The metallic-textured non-invisible heat transfer film provided in this embodiment is used to edit the effective information using a computer and then spray the pigment paste onto the heat transfer film using a digital printing machine. After drying, it is heated by a hot stamping machine and then transferred to a substrate such as polyester, spandex, silk, or nylon through the metallic color layer, the ink-absorbing layer, and the information it carries. The metallic-textured non-invisible thermal transfer film includes a base film, a heat-resistant layer coated on one side of the base film, and a metallic color layer and an ink-absorbing layer coated sequentially from the inside to the outside on the other side of the base film. The heat-resistant layer, by weight percentage, comprises the following raw material ratios: 86% water-based polyester modified silicone resin, 7% curing agent, and 7% water-based leveling agent; The metallic color layer, by mass percentage, comprises the following raw material ratios: metallic pigment (aluminum silver paste) WF969 40%, VAE emulsion 20%, polyethylene wax emulsion 29%, aqueous dispersant 4%, and wetting agent 7%. The ink-absorbing layer, by weight percentage, comprises the following raw materials: 20% waterborne polyurethane resin, 10% hydrophilic fumed silica, 13% waterborne polyethylene micron wax, 5% metallic pigment (aluminum silver paste WF969), 5% amino resin, 13% epoxy resin microcapsule powder, 25% polyurethane powder, 4% fixing agent, 2% wetting and dispersing agent, and 3% leveling agent; The metallic-textured non-intrusive thermal transfer film has a total thickness of 14±0.5μm, of which the polyester film thickness is 12±0.5μm, the metallic color layer thickness is 1μm, and the ink-absorbing layer thickness is 1μm.

[0031] The above-mentioned method for preparing a heat transfer film for a metallic-textured, non-intrusive label includes the following steps: (1) Prepare a heat-resistant layer on one side of the base film. Specifically, dilute and mix the water-based polyester modified silicone resin, curing agent and leveling agent with distilled water (the ratio of the sum of the mass of distilled water and the heat-resistant layer raw materials is 85:15), and then coat it evenly on one side of the base film. After drying at 120℃-130℃, it becomes the heat-resistant layer. (2) Prepare a metallic color layer on the other side of the base film obtained in step (1). Specifically, after mixing the VAE emulsion and polyethylene wax emulsion with distilled water and isopropanol, add water-based dispersant, wetting agent and metallic pigment (the ratio of the sum of the mass of distilled water, isopropanol and metallic color layer raw materials is 30:25:45), disperse and grind, then coat evenly on the other side of the base film, and dry at 130-150℃ to obtain the metallic color layer; (3) Prepare an ink-absorbing layer on the surface of the metallic color layer prepared in step (2); specifically, after mixing waterborne polyurethane resin and amino resin with distilled water, add hydrophilic fumed silica, waterborne polyethylene micro powder wax, metallic pigment, epoxy resin microcapsule powder, polyurethane powder, fixing agent, wetting and dispersing agent and leveling agent (the ratio of the sum of the mass of distilled water and the raw materials of the ink-absorbing layer is 40:60), disperse and grind, coat it on the surface of the metallic color layer, and dry it at 120-130℃ to obtain the ink-absorbing layer.

[0032] Example 2 The metallic-textured non-invisible heat transfer film provided in this embodiment is used to edit the effective information using a computer and then spray the pigment paste onto the heat transfer film using a digital printing machine. After drying, it is heated by a hot stamping machine and then transferred to a substrate such as polyester, spandex, silk, or nylon through the metallic color layer, the ink-absorbing layer, and the information it carries. The metallic-textured non-invisible thermal transfer film includes a base film, a heat-resistant layer coated on one side of the base film, and a metallic color layer and an ink-absorbing layer coated sequentially from the inside to the outside on the other side of the base film. The heat-resistant layer, by weight percentage, comprises the following raw material ratios: 85% water-based polyester modified silicone resin, 10% curing agent, and 5% water-based leveling agent; The metallic color layer, by mass percentage, comprises the following raw material proportions: aluminum silver paste WF969 40%, VAE emulsion 20%, polyethylene wax emulsion 29%, water-based dispersant 4%, and wetting agent 7%. The ink-absorbing layer, by weight percentage, comprises the following raw materials: 20% waterborne polyurethane resin, 10% hydrophilic fumed silica, 13% waterborne polyethylene micron wax, 5% metallic pigment (aluminum silver paste WF969), 5% amino resin, 13% epoxy resin microcapsule powder, 25% polyurethane powder, 4% fixing agent, 2% wetting and dispersing agent, and 3% leveling agent; The metallic-textured non-intrusive thermal transfer film has a total thickness of 14±0.5μm, of which the polyester film thickness is 12±0.5μm, the metallic color layer thickness is 1μm, and the ink-absorbing layer thickness is 1μm.

[0033] The above-mentioned method for preparing a heat transfer film for a metallic-textured, non-intrusive label includes the following steps: (1) Prepare a heat-resistant layer on one side of the base film. Specifically, dilute and mix the water-based polyester modified silicone resin, curing agent and leveling agent with distilled water (the ratio of the sum of the mass of distilled water and the heat-resistant layer raw materials is 80:20), and then coat it evenly on one side of the base film. After drying at 120℃-130℃, it becomes the heat-resistant layer. (2) Prepare a metallic color layer on the other side of the base film obtained in step (1). Specifically, after mixing the VAE emulsion and polyethylene wax emulsion with distilled water and isopropanol, add water-based dispersant, wetting agent and metallic pigment (the ratio of the sum of the mass of distilled water, isopropanol and metallic color layer raw materials is 30:25:45), disperse and grind, then coat evenly on the other side of the base film, and dry at 130-150℃ to obtain the metallic color layer; (3) Prepare an ink-absorbing layer on the surface of the metallic color layer prepared in step (2); specifically, after mixing waterborne polyurethane resin and amino resin with distilled water, add hydrophilic fumed silica, waterborne polyethylene micro powder wax, metallic pigment, epoxy resin microcapsule powder, polyurethane powder, fixing agent, wetting and dispersing agent and leveling agent (the ratio of the sum of the mass of distilled water and the raw materials of the ink-absorbing layer is 40:60), disperse and grind, coat it on the surface of the metallic color layer, and dry it at 120-130℃ to obtain the ink-absorbing layer.

[0034] Example 3 The metallic-textured non-invisible heat transfer film provided in this embodiment is used to edit the effective information using a computer and then spray the pigment paste onto the heat transfer film using a digital printing machine. After drying, it is heated by a hot stamping machine and then transferred to a substrate such as polyester, spandex, silk, or nylon through the metallic color layer, the ink-absorbing layer, and the information it carries. The metallic-textured non-invisible thermal transfer film includes a base film, a heat-resistant layer coated on one side of the base film, and a metallic color layer and an ink-absorbing layer coated sequentially from the inside to the outside on the other side of the base film. The heat-resistant layer, by weight percentage, comprises the following raw material ratios: 85% water-based polyester modified silicone resin, 10% curing agent, and 5% water-based leveling agent; The metallic color layer, by mass percentage, comprises the following raw materials: aluminum silver paste WF969 55%, VAE emulsion 29%, polyethylene wax emulsion 7%, aqueous dispersant 4%, and wetting agent 5%; The ink-absorbing layer, by weight percentage, comprises the following raw materials: 20% waterborne polyurethane resin, 10% hydrophilic fumed silica, 13% waterborne polyethylene micron wax, 5% metallic pigment (aluminum silver paste WF969), 5% amino resin, 13% epoxy resin microcapsule powder, 25% polyurethane powder, 4% fixing agent, 2% wetting and dispersing agent, and 3% leveling agent; The metallic-textured non-intrusive thermal transfer film has a total thickness of 14±0.5μm, of which the polyester film thickness is 12±0.5μm, the metallic color layer thickness is 1μm, and the ink-absorbing layer thickness is 1μm.

[0035] The above-mentioned method for preparing a heat transfer film for a metallic-textured, non-intrusive label includes the following steps: (1) Prepare a heat-resistant layer on one side of the base film. Specifically, dilute and mix the water-based polyester modified silicone resin, curing agent and leveling agent with distilled water (the ratio of the sum of the mass of distilled water and the heat-resistant layer raw materials is 80:20), and then coat it evenly on one side of the base film. After drying at 120℃-130℃, it becomes the heat-resistant layer. (2) Prepare a metallic color layer on the other side of the base film obtained in step (1). Specifically, after mixing the VAE emulsion and polyethylene wax emulsion with distilled water and isopropanol, add water-based dispersant, wetting agent and metallic pigment (the ratio of the sum of the mass of distilled water, isopropanol and metallic color layer raw materials is 20:25:55), disperse and grind, then coat evenly on the other side of the base film, and dry at 130-150℃ to obtain the metallic color layer; (3) Prepare an ink-absorbing layer on the surface of the metallic color layer prepared in step (2); specifically, after mixing waterborne polyurethane resin and amino resin with distilled water, add hydrophilic fumed silica, waterborne polyethylene micro powder wax, metallic pigment, epoxy resin microcapsule powder, polyurethane powder, fixing agent, wetting and dispersing agent and leveling agent (the ratio of the sum of the mass of distilled water and the raw materials of the ink-absorbing layer is 40:60), disperse and grind, coat it on the surface of the metallic color layer, and dry it at 120-130℃ to obtain the ink-absorbing layer.

[0036] Example 4 The metallic-textured non-invisible heat transfer film provided in this embodiment is used to edit the effective information using a computer and then spray the pigment paste onto the heat transfer film using a digital printing machine. After drying, it is heated by a hot stamping machine and then transferred to a substrate such as polyester, spandex, silk, or nylon through the metallic color layer, the ink-absorbing layer, and the information it carries. The metallic-textured non-invisible thermal transfer film includes a base film, a heat-resistant layer coated on one side of the base film, and a metallic color layer and an ink-absorbing layer coated sequentially from the inside to the outside on the other side of the base film. The heat-resistant layer, by weight percentage, comprises the following raw material ratios: 85% water-based polyester modified silicone resin, 10% curing agent, and 5% water-based leveling agent; The metallic color layer, by mass percentage, comprises the following raw materials: aluminum silver paste WF969 55%, VAE emulsion 29%, polyethylene wax emulsion 7%, aqueous dispersant 4%, and wetting agent 5%; The ink-absorbing layer, by weight percentage, comprises the following raw materials: 25% waterborne polyurethane resin, 10% hydrophilic fumed silica, 13% waterborne polyethylene micron wax, 5% metallic pigment (aluminum silver paste WF969), 5% amino resin, 13% epoxy resin microcapsule powder, 20% polyurethane powder, 4% fixing agent, 2% wetting and dispersing agent, and 3% leveling agent; The metallic-textured non-intrusive thermal transfer film has a total thickness of 14±0.5μm, of which the polyester film thickness is 12±0.5μm, the metallic color layer thickness is 1μm, and the ink-absorbing layer thickness is 1μm.

[0037] The above-mentioned method for preparing a heat transfer film for a metallic-textured, non-intrusive label includes the following steps: (1) Prepare a heat-resistant layer on one side of the base film. Specifically, dilute and mix the water-based polyester modified silicone resin, curing agent and leveling agent with distilled water (the ratio of the sum of the mass of distilled water and the heat-resistant layer raw materials is 80:20), and then coat it evenly on one side of the base film. After drying at 120℃-130℃, it becomes the heat-resistant layer. (2) Prepare a metallic color layer on the other side of the base film obtained in step (1). Specifically, after mixing the VAE emulsion and polyethylene wax emulsion with distilled water and isopropanol, add water-based dispersant, wetting agent and metallic pigment (the ratio of the sum of the mass of distilled water, isopropanol and metallic color layer raw materials is 20:25:55), disperse and grind, then coat evenly on the other side of the base film, and dry at 130-150℃ to obtain the metallic color layer; (3) Prepare an ink-absorbing layer on the surface of the metallic color layer prepared in step (2); specifically, after mixing waterborne polyurethane resin and amino resin with distilled water, add hydrophilic fumed silica, waterborne polyethylene micro powder wax, metallic pigment, epoxy resin microcapsule powder, polyurethane powder, fixing agent, wetting and dispersing agent and leveling agent (the ratio of the sum of the mass of distilled water and the raw materials of the ink-absorbing layer is 40:60), disperse and grind, coat it on the surface of the metallic color layer, and dry it at 120-130℃ to obtain the ink-absorbing layer.

[0038] The metallic-textured, non-removable labeling heat transfer films prepared in the above embodiments were tested for their wash fastness (the product was printed on the substrate, and the water-washed label was tested according to GB / T 3921 "Textiles - Tests for Color Fastness to Soap Wash"). Each embodiment's product was tested under different conditions. The metallic-textured, non-removable labeling heat transfer film provided by this invention achieved a wash fastness of ≥4. The rubbing fastness test (tested according to GB / T 3920 "Textiles - Tests for Color Fastness to Rubbing") showed that the metallic-textured, non-removable labeling heat transfer film provided by this invention had a rubbing fastness >4. The heat-press fastness test (tested according to GB / T 6152 "Textiles - Tests for Color Fastness to Rubbing") showed that the product provided by this invention could withstand a high temperature of 200℃.

[0039] Comparative Example 1 The metallic-textured, non-invisible heat transfer film provided in this comparative example is used to edit the effective information using a computer and then spray the pigment paste onto the heat transfer film using a digital printing machine. After drying, it is heated by a hot stamping machine and transferred to a substrate such as polyester, spandex, silk, or nylon through the metallic color layer, the ink-absorbing layer, and the information it carries. The metallic-textured non-invisible thermal transfer film includes a base film, and a metallic color layer and an ink-absorbing layer coated sequentially from the inside out on one side of the base film. The metallic color layer, by mass percentage, comprises the following raw material ratios: metallic pigment (aluminum silver paste) WF969 40%, VAE emulsion 20%, polyethylene wax emulsion 29%, aqueous dispersant 4%, and wetting agent 7%. The ink-absorbing layer, by weight percentage, comprises the following raw materials: 20% waterborne polyurethane resin, 10% hydrophilic fumed silica, 13% waterborne polyethylene micron wax, 5% metallic pigment (aluminum silver paste WF969), 5% amino resin, 13% epoxy resin microcapsule powder, 25% polyurethane powder, 4% fixing agent, 2% wetting and dispersing agent, and 3% leveling agent; The metallic-textured non-intrusive thermal transfer film has a total thickness of 14±0.5μm, of which the polyester film thickness is 12±0.5μm, the metallic color layer thickness is 1μm, and the ink-absorbing layer thickness is 1μm.

[0040] The above-mentioned method for preparing a heat transfer film for a metallic-textured, non-intrusive label includes the following steps: (1) Prepare a metallic color layer on one side of the base film. Specifically, after mixing the VAE emulsion and polyethylene wax emulsion with distilled water and isopropanol, add water-based dispersant, wetting agent and metallic pigment (the ratio of the sum of the mass of distilled water, isopropanol and metallic color layer raw materials is 30:25:45), disperse and grind, then coat evenly on the other side of the base film, and dry at 130-150℃ to obtain the metallic color layer. (2) Prepare an ink-absorbing layer on the surface of the metallic color layer prepared in step (1); specifically, after mixing waterborne polyurethane resin and amino resin with distilled water, add hydrophilic fumed silica, waterborne polyethylene micro powder wax, metallic pigment, epoxy resin microcapsule powder, polyurethane powder, fixing agent, wetting and dispersing agent and leveling agent (the ratio of the sum of the mass of distilled water and the raw materials of the ink-absorbing layer is 40:60), disperse and grind, coat it on the surface of the metallic color layer, and dry it at 120-130℃ to obtain the ink-absorbing layer.

[0041] The prepared product, during the heat transfer process using a hot stamping machine, exhibited significant deformation of the heat transfer film. A wash fastness test was conducted to assess its resistance to washing (the product was printed on the substrate, and the transferred wash label was tested according to GB / T 3921 "Textiles - Tests for Color Fastness to Washing"). The product was tested under various conditions. The heat transfer film for metallic, non-recognizable labels provided in this comparative example showed a wash fastness of grade 2. A rubbing fastness test (referring to GB / T 3920 "Textiles - Tests for Color Fastness to Rubbing") showed that the heat transfer film for metallic, non-recognizable labels provided by this invention achieved a rubbing fastness of grade 3. A heat-press fastness test (referring to GB / T 6152 "Textiles - Tests for Color Fastness to Heat-Pressure") showed that the product provided by this invention can withstand temperatures up to 200°C.

[0042] Comparative Example 2 The metallic-textured, non-invisible heat transfer film provided in this comparative example is used to edit the effective information using a computer and then spray the pigment paste onto the heat transfer film using a digital printing machine. After drying, it is heated by a hot stamping machine and transferred to a substrate such as polyester, spandex, silk, or nylon through the metallic color layer, the ink-absorbing layer, and the information it carries. The metallic-textured non-invisible thermal transfer film includes a base film, a heat-resistant layer coated on one side of the base film, and a metallic color layer and an ink-absorbing layer coated sequentially from the inside to the outside on the other side of the base film. The heat-resistant layer, by weight percentage, comprises the following raw material ratios: 86% water-based polyester modified silicone resin, 7% curing agent, and 7% water-based leveling agent; The metallic color layer, by mass percentage, comprises the following raw material ratios: metallic pigment (aluminum silver paste) WF969 40%, VAE emulsion 20%, polyethylene wax emulsion 29%, aqueous dispersant 4%, and wetting agent 7%. The ink-absorbing layer, by weight percentage, comprises the following raw materials: 25% waterborne polyurethane resin, 15% hydrophilic fumed silica, 16% waterborne polyethylene micron wax, 10% metallic pigment (aluminum silver paste WF969), 25% polyurethane powder, 4% fixing agent, 2% wetting and dispersing agent, and 3% leveling agent; The metallic-textured non-intrusive thermal transfer film has a total thickness of 14±0.5μm, of which the polyester film thickness is 12±0.5μm, the metallic color layer thickness is 1μm, and the ink-absorbing layer thickness is 1μm.

[0043] The above-mentioned method for preparing a heat transfer film for a metallic-textured, non-intrusive label includes the following steps: (1) Prepare a heat-resistant layer on one side of the base film. Specifically, dilute and mix the water-based polyester modified silicone resin, curing agent and leveling agent with distilled water (the ratio of the sum of the mass of distilled water and the heat-resistant layer raw materials is 85:15), and then coat it evenly on one side of the base film. After drying at 120℃-130℃, it becomes the heat-resistant layer. (2) Prepare a metallic color layer on the other side of the base film obtained in step (1). Specifically, after mixing the VAE emulsion and polyethylene wax emulsion with distilled water and isopropanol, add water-based dispersant, wetting agent and metallic pigment (the ratio of the sum of the mass of distilled water, isopropanol and metallic color layer raw materials is 30:25:45), disperse and grind, then coat evenly on the other side of the base film, and dry at 130-150℃ to obtain the metallic color layer; (3) Prepare an ink-absorbing layer on the surface of the metallic color layer prepared in step (2); specifically, after mixing waterborne polyurethane resin and amino resin with distilled water, add hydrophilic fumed silica, waterborne polyethylene micro powder wax, metallic pigment, fixing agent, wetting and dispersing agent and leveling agent (the ratio of the sum of the mass of distilled water and the raw materials of the ink-absorbing layer is 40:60), disperse and grind, coat it on the surface of the metallic color layer, and dry it at 120-130℃ to obtain the ink-absorbing layer.

[0044] The prepared product underwent a wash fastness test to assess its wash fastness (the product was printed on a substrate, and the transferred wash label was tested according to GB / T 3921 "Textiles - Tests for Color Fastness to Soap Wash"). The product was tested under different conditions. The metallic-textured, non-recognizable heat transfer film provided in this comparative example showed that the printing fell off after washing. A rubbing fastness test (conducted according to GB / T 3920 "Textiles - Tests for Color Fastness to Rubbing") showed that the metallic-textured, non-recognizable heat transfer film provided in this comparative example had a rubbing fastness >4. A heat-press fastness test (conducted according to GB / T 6152 "Textiles - Tests for Color Fastness to Heat Press") showed that the product provided by this invention can withstand a high temperature of 200℃.

Claims

1. A heat transfer film for a metal texture non-inductive sign, characterized by, The heat transfer film includes a base film, a heat-resistant layer disposed on one side of the base film, and a metallic color layer and an ink-absorbing layer disposed sequentially from the inside to the outside on the other side of the base film. The raw material ratios of the ink-absorbing layer are as follows: 20-25% waterborne polyurethane resin, 10-15% hydrophilic fumed silica, 10-20% waterborne polyethylene micronized wax, 5-10% metallic pigment, 5-10% amino resin, 10-20% epoxy resin microcapsule powder, 20-25% polyurethane powder, 3-10% fixing agent, 1-5% wetting and dispersing agent, and 2-5% leveling agent; The epoxy resin microcapsules in the ink-absorbing layer rupture under high pressure, and the polyurethane powder melts at high temperature, penetrating the pigment layer and allowing the transferred information to adhere firmly to the substrate. The proportions of the raw materials for the heat-resistant layer, by weight percentage, are: 80-88% water-based polyester modified silicone resin, 5-10% curing agent, and 5-10% water-based leveling agent; The proportions of the raw materials for the metallic color layer, by weight percentage, are as follows: metallic pigment 30-60%, VAE emulsion 20-30%, polyethylene wax emulsion 5-30%, aqueous dispersant 2-5%, and wetting agent 5-10%; The heat transfer film can impart a metallic luster to the substrate after heat transfer, enhancing the visual quality of the product, while maintaining a smooth surface without any abruptness. The color fastness to water washing is ≥4, the color fastness to rubbing is >4, and it can withstand high temperatures of 200℃.

2. The thermal transfer film for a metal finish non-inductive sign according to claim 1, wherein The thickness of the metallic color layer is 1-2 μm.

3. The thermal transfer film for a metal finish non-inductive sign according to claim 1, wherein The thickness of the ink-absorbing layer is 1-2 μm.

4. The thermal transfer film for a metal finish non-inductive sign according to claim 1, wherein The thickness of the base film is 12±0.5μm.

5. The thermal transfer film for a metal finish non-inductive sign according to claim 1, wherein The total thickness of the heat transfer film is 14-16 μm.

6. The production method of the thermal transfer film for a metal- texture non-inductive sign according to any one of claims 1 to 5, characterized in that, Includes the following steps: (1) Prepare a heat-resistant layer on one side of the base film; dilute and mix the water-based polyester modified silicone resin, curing agent and water-based leveling agent with distilled water, then coat it evenly on one side of the base film, and dry it at 120℃-130℃ to obtain the heat-resistant layer. (2) Prepare a metallic color layer on the other side of the base film obtained in step (1); mix VAE emulsion and polyethylene wax emulsion with distilled water and isopropanol, add water-based dispersant, wetting agent and metallic pigment, disperse and grind, then coat evenly on the other side of the base film, and dry at 130-150℃ to obtain the metallic color layer. (3) Prepare an ink-absorbing layer on the surface of the metallic color layer prepared in step (2); mix waterborne polyurethane resin and amino resin with distilled water, then add hydrophilic fumed silica, waterborne polyethylene micro powder wax, metallic pigment, epoxy resin microcapsule powder, polyurethane powder, fixing agent, wetting and dispersing agent and leveling agent, disperse and grind, then coat evenly on the surface of the metallic color layer, and dry at 120-130℃ to obtain the ink-absorbing layer.