Preparation method of transfer anti-theft film-based EAS label

Abstract

The invention relates to the technical field of labels, in particular to a preparation method of a transfer anti-theft film-based EAS label, which comprises the following steps: S1, preparing a surface layer: selecting a PET film as a raw material for the surface layer, pretreating the PET film, and performing coating treatment on the surface of the PET film to obtain the surface layer; s2, preparing an isolating layer, wherein polyvinyl alcohol, nano silicon dioxide and aluminum-magnesium hydrotalcite are selected as raw materials of the isolating layer. In the preparation of the transfer anti-theft film-based EAS label, the surface layer forms a fluorine-silicon coating through the matching of methyltrimethoxysilane, heptadecafluorodecyl trimethoxysilane and epoxy silane, so that a physical barrier is formed, and a relatively good protection effect is achieved on the inner layer; and crystal violet lactone in the dye layer reacts with bisphenol A to generate a colored mark, and the colored mark can be rapidly cured to form an irreversible trace on the pasting surface, so that a relatively good anti-theft marking effect is achieved.

Description

Technical Field

[0001] This invention relates to the field of tag technology, specifically to a method for preparing transfer anti-theft film-based EAS tags. Background Technology

[0002] Anti-theft tags are electronic tags used in retail establishments such as shopping malls and supermarkets to prevent theft of goods. They work by working in conjunction with door detectors. When a tag passes by, the detector will sound an alarm, which can improve the efficiency of goods security management and is a common tool for retail security.

[0003] In existing technologies, anti-theft tags are applied directly to the surface of items. This method carries the risk that the tag can be peeled off and discarded, allowing the item to be stolen, thus compromising their anti-theft performance. Therefore, this invention provides a method for preparing a transfer-based anti-theft film-based EAS tag. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A method for preparing a transfer anti-theft film-based EAS tag includes the following steps:

[0006] S1: Surface layer preparation. The surface layer is made of PET film as raw material. After the PET film is pretreated, a coating is applied to the surface of the PET film to obtain the surface layer.

[0007] S2: Preparation of the isolation layer. The raw materials for the isolation layer are polyvinyl alcohol, nano-silica, and aluminum-magnesium hydrotalcite.

[0008] S3: Dye layer preparation: The dye layer is prepared by printing and curing on the surface of the isolation layer.

[0009] S4: Adhesive layer preparation. The adhesive layer adopts a double-layer gradient structure, with acrylic adhesive as the bottom layer and photodegradable adhesive as the top layer.

[0010] S5: Circuit layer fabrication, the raw material for the circuit layer is silver-aluminum composite foil;

[0011] S6: Preparation of the base paper layer. The raw material for the base paper layer is glassine paper.

[0012] Furthermore, the pretreatment method for the PET film in S1 is as follows: the PET film is placed in a low-temperature plasma device for 30-60 seconds, the treatment temperature is 15-25℃, and the power is 400-500W.

[0013] Further, the method for preparing the coating in S1 is as follows: methyltrimethoxysilane, heptadecafluorodecyltrimethoxysilane, epoxysilane, and KH560 are added to a flask, stirred evenly, and then ethanol is slowly added. The mixture is stirred at room temperature for 10–20 min. During stirring, a mixture of dilute hydrochloric acid and deionized water is added dropwise to the flask. The resulting product is then placed in a water bath at a temperature of 40–50 °C. A magnetic stirrer is connected to the water bath at a speed of 50–60 r / min. The mixture is stirred at this constant temperature for 1–2 h. Afterward, the temperature is set at 40–50 °C, the stirring speed is 30–50 r / min, and the mixture is stirred at this constant temperature for 40–60 min. Ammonia water is added dropwise to adjust the pH value to 7-8, resulting in a mixture. The mixture and nano-alumina are then added to a mixer, which is set to 800-1000 r / min and stirred for 30-40 min. After standing for 2-4 h, a coating is obtained. The mass ratio of methyltrimethoxysilane, heptadecafluorodecyltrimethoxysilane, epoxysilane, and KH560 is 1:(0.1-0.3):(0.1-0.3):(0.04-0.06), the mass ratio of dilute hydrochloric acid to deionized water is 1:(4-6), the mass of dilute hydrochloric acid is 15-25% of the mass of methyltrimethoxysilane, and the mass ratio of the mixture to nano-alumina is 1:(0.06-0.08).

[0014] Furthermore, the coating process in S1 is as follows: the coating is uniformly applied to the surface of the pretreated PET film using a micro-gravure roller. After coating, the film is placed in an oven and cured at 130-160°C for 1-2 minutes to complete the coating process and obtain the surface layer.

[0015] Further, the method for preparing the isolation layer is as follows: polyvinyl alcohol, nano silica, and aluminum-magnesium hydrotalcite are mixed and melted, and then cast onto the back side of the surface layer to form a film. The film is then dried at 60-80°C for 40-60 minutes to obtain the isolation layer. The mass ratio of polyvinyl alcohol, nano silica, and aluminum-magnesium hydrotalcite is 1:(0.1-0.3):(0.08-0.12).

[0016] Furthermore, the method for preparing the dye layer is as follows: a fluorescent pattern is printed on the surface of the isolation layer by screen printing, followed by UV curing treatment, then a coating liquid is applied to the surface of the printed material, uniformly coated by a comma scraper, and dried and cured at 70-90°C for 5-10 minutes to obtain the dye layer.

[0017] Further, the preparation method of the coating solution is as follows: crystal violet lactone, 4-hydroxy-4'-isopropoxydiphenyl sulfone, and dibutyl phthalate are added to a reaction vessel. The reaction vessel temperature is set at 70-80℃, the stirring speed is 200-400 r / min, and the mixture is kept at a constant temperature and stirred for 20-30 min to obtain the core material. Melamine, formaldehyde solution, and urea are added to the reaction vessel. The reaction vessel temperature is set at 60-70℃, the stirring speed is 400-600 r / min, and the mixture is kept at a constant temperature and stirred for 10-20 min. Then, triethanolamine is added dropwise. The pH was adjusted to 8.5 to obtain a solution. Bisphenol A, deionized water, and sodium lignosulfonate were added to a mixer, which was then stirred at 400–600 rpm for 40–60 minutes to obtain a dispersant. The core material, solution, and dispersant were then added to the mixer, along with gum arabic and deionized water. The mixer was stirred at 60–100 rpm for 40–60 minutes. The resulting product was then fed into a high-speed shear mill and processed at 10,000–15,000 rpm for 10–20 minutes to obtain an emulsion. The pH of the emulsion was adjusted to 5.5 using citric acid. The emulsion was then reacted at 60–70°C for 2–4 hours. The resulting product was rinsed with deionized water and then vacuum dried at 40–50°C for 6–8 hours to obtain a powder. The powder, waterborne polyurethane, silicone defoamer, and UV326 were mixed to prepare a coating solution. The mass ratio of crystal violet lactone, 4-hydroxy-4'-isopropoxydiphenyl sulfone, and dibutyl phthalate was 1:(1.5–2):(0.4–0.6). Melamine was also used. The mass ratio of formaldehyde solution to urea is 1:(2-3):(0.2-0.4), the mass concentration of formaldehyde solution is 30-40%, and the mass of the solution is 4-6 times the mass of the core material. The mass ratio of bisphenol A, deionized water, and sodium lignosulfonate is 1:(4-6):(0.1-0.3), the mass of dispersant is 6-8% of the mass of the solution, and the mass ratio of powder, waterborne polyurethane, silicone defoamer, and UV326 is 1:(0.6-0.8):(0.04-0.06):(0.04-0.06).

[0018] Furthermore, the method for preparing the adhesive layer is as follows: acrylic adhesive is coated onto the surface of the dye layer using an anilox roller, and photodegradable adhesive is coated using a slit-type die. After coating, the adhesive layer is dried at 80-100°C for 1-2 minutes to obtain the adhesive layer. 3-5% benzophenone is added to the photodegradable adhesive.

[0019] Furthermore, the method for preparing the circuit layer is as follows: an antenna pattern is etched on the surface of a silver-aluminum composite foil using a laser engraving machine, and then polypyrrole is coated using a dispensing machine. The chip is then flip-chip bonded to obtain the circuit layer.

[0020] Furthermore, the method for preparing the base paper layer is as follows: after the glassine paper is treated by an atmospheric plasma spray gun, an organosilicon release agent is coated on the surface of the glassine paper by a gravure roller, and the paper is cured at 120-150°C for 30-60 seconds. The circuit layer and the base paper layer are then attached to the adhesive layer surface in sequence, and the paper is rolled and laminated to obtain the transfer anti-theft film base EAS label.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. In the preparation of the transfer anti-theft film-based EAS tag in this invention, the surface layer is formed by the combination of methyltrimethoxysilane, heptadecafluorodecyltrimethoxysilane and epoxysilane to form a fluorosilicone coating, which forms a physical barrier and provides good protection for the inner layer. When the tag is peeled off after being adhered, the crystal violet lactone in the dye layer reacts with bisphenol A to generate a colored mark, which can be cured quickly to form an irreversible mark on the adhesive surface, thus achieving a good anti-theft marking effect.

[0023] 2. In this invention, in the dye layer, the isocyanate groups of the waterborne polyurethane react with the hydroxyl groups of the polyvinyl alcohol in the isolation layer to form urethane bonds. At the same time, sodium lignosulfonate forms ionic bonds through the sulfonic acid groups of polyvinyl alcohol, enhancing the interfacial anchoring. The crystal violet lactone in the coating liquid is encapsulated in the polyurethane matrix and forms a mechanical interlocking structure with the isolation layer through surface roughness, which plays a role in improving the bonding stability of the label isolation layer, thereby effectively improving the adhesive stability of the label. Attached Figure Description

[0024] Figure 1 This is a flowchart illustrating the preparation method of the transfer anti-theft film-based EAS tag proposed in this invention. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that the raw materials used in the following embodiments are all commercially available.

[0027] Example 1:

[0028] S1: Surface layer preparation. The surface layer is made of PET film as raw material. After the PET film is pretreated, a coating is applied to the surface of the PET film to obtain the surface layer.

[0029] The pretreatment method for the PET film in S1 is as follows: the PET film is placed in a low-temperature plasma device for 30 seconds, the treatment temperature is 15℃, and the power is 400W.

[0030] The method for preparing the coating in S1 is as follows: methyltrimethoxysilane, heptadecafluorodecyltrimethoxysilane, epoxysilane, and KH560 are added to a flask and stirred until homogeneous. Ethanol is then slowly added, and the mixture is stirred at room temperature for 10 minutes. During stirring, a mixture of dilute hydrochloric acid and deionized water is added dropwise to the flask. The resulting product is then placed in a water bath at 40°C, and a magnetic stirrer is connected and set to a speed of 50 r / min. The mixture is stirred at this constant temperature for 1 hour, followed by a temperature setting of 40°C and a stirring speed of 30 r / min for further stirring. For 40 minutes, ammonia water was added dropwise during stirring to adjust the pH value to 7, resulting in a mixture. The mixture and nano-alumina were added to a mixer, which was set to 800 r / min and stirred for 30 minutes. After standing for 2 hours, a coating was obtained. The mass ratio of methyltrimethoxysilane, heptadecafluorodecyltrimethoxysilane, epoxysilane, and KH560 was 1:0.1:0.1:0.04, the mass ratio of dilute hydrochloric acid and deionized water was 1:4, the mass of dilute hydrochloric acid was 15% of the mass of methyltrimethoxysilane, and the mass ratio of the mixture and nano-alumina was 1:0.06.

[0031] The coating process in S1 is as follows: the coating is evenly applied to the surface of the pretreated PET film using a micro-gravure roller. After coating, the film is placed in an oven at 130°C for 1 minute to cure and complete the coating process, thus obtaining the surface layer.

[0032] S2: Preparation of the isolation layer. The raw materials for the isolation layer are polyvinyl alcohol, nano-silica, and aluminum-magnesium hydrotalcite.

[0033] The method for preparing the isolation layer is as follows: polyvinyl alcohol, nano silica, and aluminum-magnesium hydrotalcite are mixed and melted, and then cast onto the back side of the surface layer to form a film. The film is then dried at 60°C for 40 minutes to obtain the isolation layer. The mass ratio of polyvinyl alcohol, nano silica, and aluminum-magnesium hydrotalcite is 1:0.1:0.08.

[0034] S3: Dye layer preparation: The dye layer is prepared by printing and curing on the surface of the isolation layer.

[0035] The method for preparing the dye layer is as follows: the fluorescent pattern is printed on the surface of the isolation layer by screen printing, followed by UV curing treatment, then the coating liquid is coated on the surface of the printed material, and the coating is uniformly coated by a comma scraper. The dye layer is obtained by drying and curing at 70°C for 5 minutes.

[0036] The coating solution is prepared as follows: Crystal violet lactone, 4-hydroxy-4'-isopropoxydiphenyl sulfone, and dibutyl phthalate are added to a reaction vessel. The reaction vessel is set to a temperature of 70℃, and the stirring speed is 200 r / min. The mixture is stirred at this constant temperature for 20 min to obtain the core material. Melamine, formaldehyde solution, and urea are added to the reaction vessel. The reaction vessel is set to a temperature of 60℃, and the stirring speed is 400 r / min. The mixture is stirred at this constant temperature for 10 min. Then, triethanolamine is added dropwise to adjust the pH value to 8.5 to obtain the solution. Bisphenol A, deionized water, and sodium lignosulfonate are added to a mixer. The mixer is set to 400 r / min and stirred for 40 min to obtain the dispersant. The core material, solution, and dispersant are added to the mixer. Gum arabic and deionized water are added to the mixer. The mixer is set to 60 r / min and stirred for 40 min. The resulting product is sent to a high-speed shear mill and processed at 10000 r / min for 10 min. The emulsion was obtained by reacting the emulsion at 60°C for 2 hours using citric acid. The resulting product was then rinsed with deionized water and vacuum dried at 40°C for 6 hours to obtain a powder. The powder, waterborne polyurethane, silicone defoamer, and UV326 were mixed to prepare a coating solution. The coating solution contained crystal violet lactone, 4-hydroxy-4'-isopropoxydiphenyl sulfone, and dibutyl phthalate. The mass ratio of melamine, formaldehyde solution, and urea is 1:1.5:0.4; the mass ratio of melamine, formaldehyde solution, and urea is 1:2:0.2; the mass concentration of formaldehyde solution is 30%; the mass of the solution is 4 times the mass of the core material; the mass ratio of bisphenol A, deionized water, and sodium lignosulfonate is 1:4:0.1; the mass of dispersant is 6% of the solution mass; and the mass ratio of powder, waterborne polyurethane, silicone defoamer, and UV326 is 1:0.6; 0.04:0.04.

[0037] S4: Adhesive layer preparation. The adhesive layer adopts a double-layer gradient structure, with acrylic adhesive as the bottom layer and photodegradable adhesive as the top layer.

[0038] The method for preparing the adhesive layer is as follows: acrylic adhesive is coated onto the surface of the dye layer by an anilox roller, and photodegradable adhesive is coated by a slit die. After coating, the adhesive layer is dried at 80°C for 1 minute to obtain the adhesive layer. 3% benzophenone is added to the photodegradable adhesive.

[0039] S5: Circuit layer fabrication, the raw material for the circuit layer is silver-aluminum composite foil;

[0040] The method for fabricating the circuit layer is as follows: an antenna pattern is etched on the surface of a silver-aluminum composite foil using a laser engraving machine, and then polypyrrole is coated using a dispensing machine. The chip is then flip-chip bonded to obtain the circuit layer.

[0041] S6: Preparation of the base paper layer; the raw material for the base paper layer is glassine paper.

[0042] The method for preparing the base paper layer is as follows: after the glassine paper is treated by an atmospheric plasma spray gun, an organosilicon release agent is coated on the surface of the glassine paper by a gravure roller, and it is cured at 120°C for 30 seconds. The circuit layer and the base paper layer are then attached to the adhesive layer surface in sequence, and the transfer anti-theft film base EAS label is obtained by roller pressing.

[0043] Example 2:

[0044] S1: Surface layer preparation. The surface layer is made of PET film as raw material. After the PET film is pretreated, a coating is applied to the surface of the PET film to obtain the surface layer.

[0045] The pretreatment method for the PET film in S1 is as follows: the PET film is placed in a low-temperature plasma device for 45 seconds, the treatment temperature is 20℃, and the power is 450W.

[0046] The method for preparing the coating in S1 is as follows: Methyltrimethoxysilane, heptadecafluorodecyltrimethoxysilane, epoxysilane, and KH560 are added to a flask and stirred until homogeneous. Ethanol is then slowly added, and the mixture is stirred at room temperature for 15 minutes. During stirring, a mixture of dilute hydrochloric acid and deionized water is added dropwise to the flask. The resulting product is then placed in a water bath at 45°C, and a magnetic stirrer is connected and set to a speed of 55 r / min. The mixture is stirred at this constant temperature for 1.5 hours, followed by a temperature setting of 45°C and a stirring speed of 40 r / min for further stirring. For 50 minutes, ammonia water was added dropwise during stirring to adjust the pH value to 7.5, resulting in a mixture. The mixture and nano-alumina were added to a mixer, which was set to 900 r / min and stirred for 35 minutes. After standing for 3 hours, a coating was obtained. The mass ratio of methyltrimethoxysilane, heptadecafluorodecyltrimethoxysilane, epoxysilane, and KH560 was 1:0.2:0.2:0.05, the mass ratio of dilute hydrochloric acid and deionized water was 1:5, the mass of dilute hydrochloric acid was 20% of the mass of methyltrimethoxysilane, and the mass ratio of the mixture and nano-alumina was 1:0.07.

[0047] The coating process in S1 is as follows: the coating is evenly applied to the surface of the pretreated PET film using a micro-gravure roller. After coating, the film is placed in an oven at 145°C for 1.5 minutes to cure, thus completing the coating process and obtaining the surface layer.

[0048] S2: Preparation of the isolation layer. The raw materials for the isolation layer are polyvinyl alcohol, nano-silica, and aluminum-magnesium hydrotalcite.

[0049] The method for preparing the isolation layer is as follows: polyvinyl alcohol, nano silica, and aluminum-magnesium hydrotalcite are mixed and melted, and then cast onto the back side of the surface layer to form a film. The film is then dried at 70°C for 50 minutes to obtain the isolation layer. The mass ratio of polyvinyl alcohol, nano silica, and aluminum-magnesium hydrotalcite is 1:0.2:0.1.

[0050] S3: Dye layer preparation: The dye layer is prepared by printing and curing on the surface of the isolation layer.

[0051] The method for preparing the dye layer is as follows: the fluorescent pattern is printed on the surface of the isolation layer by screen printing, followed by UV curing treatment, then the coating liquid is coated on the surface of the printed material, and the coating is uniformly coated by a comma scraper. The dye layer is obtained by drying and curing at 80°C for 7 minutes.

[0052] The coating solution is prepared as follows: Crystal violet lactone, 4-hydroxy-4'-isopropoxydiphenyl sulfone, and dibutyl phthalate are added to a reaction vessel. The reaction vessel is set to a temperature of 75℃ and a stirring speed of 300 r / min. The mixture is stirred at this constant temperature for 25 min to obtain the core material. Melamine, formaldehyde solution, and urea are added to the reaction vessel. The reaction vessel is set to a temperature of 65℃ and a stirring speed of 500 r / min. The mixture is stirred at this constant temperature for 15 min. Then, triethanolamine is added dropwise to adjust the pH value to 8.5 to obtain the solution. Bisphenol A, deionized water, and sodium lignosulfonate are added to a mixer. The mixer is set to a speed of 500 r / min and stirred for 500 min to obtain the dispersant. The core material, solution, and dispersant are added to the mixer. Gum arabic and deionized water are added to the mixer. The mixer is set to a speed of 80 r / min and stirred for 50 min. The resulting product is then fed into a high-speed shear mill and processed at 12000 r / min for 15 min. The emulsion was obtained by reacting with citric acid to adjust its pH to 5.5. The emulsion was then reacted at 65°C for 3 hours. The resulting product was rinsed with deionized water and then vacuum-dried at 45°C for 7 hours to obtain a powder. The powder, waterborne polyurethane, silicone defoamer, and UV326 were mixed to prepare a coating solution. The coating solution contained crystal violet lactone, 4-hydroxy-4'-isopropoxydiphenyl sulfone, and dibutyl phthalate. The mass ratio of melamine, formaldehyde solution, and urea is 1:1.7:0.5; the mass ratio of formaldehyde solution to urea is 1:2.5:0.3; the mass concentration of formaldehyde solution is 35%; the mass of the solution is 5 times the mass of the core material; the mass ratio of bisphenol A, deionized water, and sodium lignosulfonate is 1:5:0.2; the mass of dispersant is 7% of the solution mass; and the mass ratio of powder, waterborne polyurethane, silicone defoamer, and UV326 is 1:0.7; 0.05:0.05.

[0053] S4: Adhesive layer preparation. The adhesive layer adopts a double-layer gradient structure, with acrylic adhesive as the bottom layer and photodegradable adhesive as the top layer.

[0054] The method for preparing the adhesive layer is as follows: acrylic adhesive is coated onto the surface of the dye layer by an anilox roller, and photodegradable adhesive is coated by a slit die. After coating, the adhesive layer is dried at 90°C for 1.5 min to obtain the adhesive layer. 4% benzophenone is added to the photodegradable adhesive.

[0055] S5: Circuit layer fabrication, the raw material for the circuit layer is silver-aluminum composite foil;

[0056] The method for fabricating the circuit layer is as follows: an antenna pattern is etched on the surface of a silver-aluminum composite foil using a laser engraving machine, and then polypyrrole is coated using a dispensing machine. The chip is then flip-chip bonded to obtain the circuit layer.

[0057] S6: Preparation of the base paper layer; the raw material for the base paper layer is glassine paper.

[0058] The method for preparing the base paper layer is as follows: after the glassine paper is treated by an atmospheric plasma spray gun, an organosilicon release agent is coated on the surface of the glassine paper by a gravure roller, and it is cured at 135°C for 45 seconds. The circuit layer and the base paper layer are then attached to the adhesive layer surface in sequence, and the transfer anti-theft film base EAS label is obtained by roller pressing.

[0059] Example 3:

[0060] S1: Surface layer preparation. The surface layer is made of PET film as raw material. After the PET film is pretreated, a coating is applied to the surface of the PET film to obtain the surface layer.

[0061] The pretreatment method for the PET film in S1 is as follows: the PET film is placed in a low-temperature plasma device for 60 seconds, the treatment temperature is 25℃, and the power is 500W.

[0062] The method for preparing the coating in S1 is as follows: methyltrimethoxysilane, heptadecafluorodecyltrimethoxysilane, epoxysilane, and KH560 are added to a flask and stirred until homogeneous. Ethanol is then slowly added, and the mixture is stirred at room temperature for 120 min. During stirring, a mixture of dilute hydrochloric acid and deionized water is added dropwise to the flask. The resulting product is then placed in a water bath at 50°C, and a magnetic stirrer is connected and set to a speed of 60 r / min. The mixture is stirred at this constant temperature for 2 h, followed by a constant temperature stirring at 50°C and a stirring speed of 50 r / min. For 60 minutes, ammonia water was added dropwise during stirring to adjust the pH value to 8, resulting in a mixture. The mixture and nano-alumina were added to a mixer, which was set to 1000 r / min and stirred for 40 minutes. After standing for 4 hours, a coating was obtained. The mass ratio of methyltrimethoxysilane, heptadecafluorodecyltrimethoxysilane, epoxysilane, and KH560 was 1:0.3:0.3:0.06, the mass ratio of dilute hydrochloric acid and deionized water was 1:6, the mass of dilute hydrochloric acid was 25% of the mass of methyltrimethoxysilane, and the mass ratio of the mixture and nano-alumina was 1:0.08.

[0063] The coating process in S1 is as follows: the coating is uniformly applied to the surface of the pretreated PET film using a micro-gravure roller. After coating, the film is placed in an oven at 160°C for 2 minutes to cure, thus completing the coating process and obtaining the surface layer.

[0064] S2: Preparation of the isolation layer. The raw materials for the isolation layer are polyvinyl alcohol, nano-silica, and aluminum-magnesium hydrotalcite.

[0065] The method for preparing the isolation layer is as follows: polyvinyl alcohol, nano silica, and aluminum-magnesium hydrotalcite are mixed and melted, and then cast onto the back side of the surface layer to form a film. The film is then dried at 80°C for 60 minutes to obtain the isolation layer. The mass ratio of polyvinyl alcohol, nano silica, and aluminum-magnesium hydrotalcite is 1:0.3:0.12.

[0066] S3: Dye layer preparation: The dye layer is prepared by printing and curing on the surface of the isolation layer.

[0067] The method for preparing the dye layer is as follows: the fluorescent pattern is printed on the surface of the isolation layer by screen printing, followed by UV curing treatment, then the coating liquid is applied to the surface of the printed material, and the coating is uniformly applied by a comma scraper. The dye layer is then dried and cured at 90°C for 10 minutes.

[0068] The coating solution is prepared as follows: Crystal violet lactone, 4-hydroxy-4'-isopropoxydiphenyl sulfone, and dibutyl phthalate are added to a reaction vessel. The reaction vessel is set to a temperature of 80℃ and a stirring speed of 400 r / min. The mixture is stirred at this constant temperature for 30 min to obtain the core material. Melamine, formaldehyde solution, and urea are added to the reaction vessel. The reaction vessel is set to a temperature of 70℃ and a stirring speed of 600 r / min. The mixture is stirred at this constant temperature for 20 min. Then, triethanolamine is added dropwise to adjust the pH value to 8.5 to obtain a solution. Bisphenol A, deionized water, and sodium lignosulfonate are added to a mixer. The mixer is set to a speed of 600 r / min and stirred for 60 min to obtain a dispersant. The core material, solution, and dispersant are added to the mixer. Gum arabic and deionized water are added to the mixer. The mixer is set to a speed of 100 r / min and stirred for 60 min. The resulting product is then fed into a high-speed shear mill and processed at 15000 r / min. After 20 minutes, an emulsion was obtained. The pH of the emulsion was adjusted to 5.5 using citric acid. The emulsion was then kept at 70°C for 4 hours. The resulting product was rinsed with deionized water and then vacuum dried at 50°C for 8 hours to obtain a powder. The powder, waterborne polyurethane, silicone defoamer, and UV326 were mixed to prepare a coating liquid. The coating liquid contained crystal violet lactone, 4-hydroxy-4'-isopropoxydiphenyl sulfone, and dibutyl phthalate. The mass ratio of ester is 1:2:0.6; the mass ratio of melamine, formaldehyde solution, and urea is 1:3:0.4; the mass concentration of formaldehyde solution is 40%; the mass of the solution is 6 times the mass of the core material; the mass ratio of bisphenol A, deionized water, and sodium lignosulfonate is 1:6:0.3; the mass of dispersant is 8% of the solution mass; and the mass ratio of powder, waterborne polyurethane, silicone defoamer, and UV326 is 1:0.8; 0.06:0.06.

[0069] S4: Adhesive layer preparation. The adhesive layer adopts a double-layer gradient structure, with acrylic adhesive as the bottom layer and photodegradable adhesive as the top layer.

[0070] The method for preparing the adhesive layer is as follows: acrylic adhesive is coated onto the surface of the dye layer by an anilox roller, and photodegradable adhesive is coated by a slit die. After coating, the adhesive layer is dried at 100°C for 2 minutes to obtain the adhesive layer. 5% benzophenone is added to the photodegradable adhesive.

[0071] S5: Circuit layer fabrication, the raw material for the circuit layer is silver-aluminum composite foil;

[0072] The method for fabricating the circuit layer is as follows: an antenna pattern is etched on the surface of a silver-aluminum composite foil using a laser engraving machine, and then polypyrrole is coated using a dispensing machine. The chip is then flip-chip bonded to obtain the circuit layer.

[0073] S6: Preparation of the base paper layer; the raw material for the base paper layer is glassine paper.

[0074] The method for preparing the base paper layer is as follows: after the glassine paper is treated by an atmospheric plasma spray gun, an organosilicon release agent is coated on the surface of the glassine paper by a gravure roller, and it is cured at 150°C for 60 seconds. The circuit layer and the base paper layer are then attached to the adhesive layer surface in sequence, and the transfer anti-theft film base EAS label is obtained by roller pressing.

[0075] Comparative Example 1: The difference between this comparative example and Example 1 is that this comparative example does not contain waterborne polyurethane.

[0076] Comparative Example 2 differs from Example 1 in that it does not contain sodium lignosulfonate.

[0077] Comparative Example 3 differs from Example 1 in that it does not contain crystal violet lactone.

[0078] Comparative Example 4 differs from Example 1 in that it does not contain a dye layer.

[0079] Performance testing: The transfer anti-theft film-based EAS tags prepared in Examples 1, 2, 3, 1, 2, 3, and 4 were subjected to performance testing. The test data are recorded in the table below:

[0080]

[0081] In the performance test, the marking effect was tested as follows: the transfer anti-theft film-based EAS labels prepared in Examples 1, 2, 3, 1, 2, 3 and 4 were affixed to the stainless steel surface. After pressing and affixing, the labels were left to stand for 30 minutes and then peeled off to observe the residual marking state on the stainless steel surface.

[0082] The method for testing the adhesion stability is as follows: the transfer anti-theft film-based EAS labels prepared in Examples 1, 2, 3, 1, 2, 3 and 4 are affixed to the stainless steel surface. After pressing and bonding, the carrier is placed in a shaker and shaken to simulate transportation. The adhesion status of the labels is observed after 72 hours.

[0083] It is evident that the marking effect and adhesion stability of the transfer anti-theft film-based EAS tags prepared in Comparative Examples 1, 2, 3, and 4 are all lower than those in Examples 1, 2, and 3. This indicates that in the preparation of the transfer anti-theft film-based EAS tags, the surface layer forms a fluorosilicone coating through the combination of methyltrimethoxysilane, heptadecafluorodecyltrimethoxysilane, and epoxysilane, which acts as a physical barrier and provides good protection for the inner layer. When the tag is peeled off after adhesion, the crystal violet lactone in the dye layer reacts with bisphenol A to generate a colored mark, which can be cured quickly, forming an irreversible mark on the adhesive surface, thus achieving a good anti-theft marking effect.

[0084] In the dye layer, the isocyanate groups of waterborne polyurethane react with the hydroxyl groups of polyvinyl alcohol in the release layer to form urethane bonds. At the same time, sodium lignosulfonate forms ionic bonds through the sulfonic acid groups of polyvinyl alcohol, enhancing the interfacial anchoring. Crystal violet lactone in the coating solution is encapsulated in the polyurethane matrix and forms a mechanical interlocking structure with the release layer through surface roughness, which plays a role in improving the bonding stability of the label release layer, thereby effectively improving the adhesive stability of the label.

[0085] By comparing and analyzing the relevant data in the table, it can be seen that the transfer anti-theft film-based EAS tag prepared by this invention not only has a good marking effect but also excellent adhesive stability. This indicates that the preparation method of the transfer anti-theft film-based EAS tag provided by this invention has a broader market prospect and is more suitable for widespread application.

[0086] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0087] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for preparing a transfer anti-theft film-based EAS tag, characterized in that: Includes the following steps: S1: Surface layer preparation. The surface layer is made of PET film as raw material. After the PET film is pretreated, a coating is applied to the surface of the PET film to obtain the surface layer. S2: Preparation of the isolation layer. The raw materials for the isolation layer are polyvinyl alcohol, nano-silica, and aluminum-magnesium hydrotalcite. S3: Dye layer preparation: The dye layer is prepared by printing and curing on the surface of the isolation layer. S4: Adhesive layer preparation. The adhesive layer adopts a double-layer gradient structure, with acrylic adhesive as the bottom layer and photodegradable adhesive as the top layer. S5: Circuit layer fabrication, the raw material for the circuit layer is silver-aluminum composite foil; S6: Preparation of the base paper layer. The raw material for the base paper layer is glassine paper.

2. The method for preparing the transfer anti-theft film-based EAS tag according to claim 1, characterized in that, The pretreatment method for the PET film in S1 is as follows: the PET film is placed in a low-temperature plasma device for 30-60 seconds, the treatment temperature is 15-25℃, and the power is 400-500W.

3. The method for preparing the transfer anti-theft film-based EAS tag according to claim 1, characterized in that, The method for preparing the coating in S1 is as follows: Methyltrimethoxysilane, heptadecafluorodecyltrimethoxysilane, epoxysilane, and KH560 are added to a flask and stirred until homogeneous. Ethanol is then slowly added, and the mixture is stirred at room temperature for 10–20 min. During stirring, a mixture of dilute hydrochloric acid and deionized water is added dropwise to the flask. The resulting product is then placed in a water bath at a temperature of 40–50 °C. A magnetic stirrer is connected and set to a speed of 50–60 r / min. The mixture is stirred at this constant temperature for 1–2 h. Afterward, the temperature is set to 40–50 °C, the stirring speed is 30–50 r / min, and the mixture is stirred at this constant temperature for 40–60 min. During the stirring process, ethanol is added dropwise... Ammonia water is used to adjust the pH value to 7-8 to obtain a mixture. The mixture and nano-alumina are added to a mixer, which is set to 800-1000 r / min and stirred for 30-40 min. After standing for 2-4 h, a coating is obtained. The mass ratio of methyltrimethoxysilane, heptadecafluorodecyltrimethoxysilane, epoxysilane, and KH560 is 1:(0.1-0.3):(0.1-0.3):(0.04-0.06), the mass ratio of dilute hydrochloric acid to deionized water is 1:(4-6), the mass of dilute hydrochloric acid is 15-25% of the mass of methyltrimethoxysilane, and the mass ratio of the mixture to nano-alumina is 1:(0.06-0.08).

4. The method for preparing the transfer anti-theft film-based EAS tag according to claim 1, characterized in that, The coating process in S1 is as follows: the coating is uniformly applied to the surface of the pretreated PET film using a micro-gravure roller. After coating, the film is placed in an oven at 130-160°C for 1-2 minutes to cure, thus completing the coating process and obtaining the surface layer.

5. The method for preparing the transfer anti-theft film-based EAS tag according to claim 1, characterized in that, The method for preparing the isolation layer is as follows: polyvinyl alcohol, nano silica, and aluminum-magnesium hydrotalcite are mixed and melted, and then cast onto the back side of the surface layer to form a film. The film is then dried at 60-80°C for 40-60 minutes to obtain the isolation layer. The mass ratio of polyvinyl alcohol, nano silica, and aluminum-magnesium hydrotalcite is 1:(0.1-0.3):(0.08-0.12).

6. The method for preparing the transfer anti-theft film-based EAS tag according to claim 1, characterized in that, The method for preparing the dye layer is as follows: a fluorescent pattern is printed on the surface of the isolation layer by screen printing, followed by UV curing treatment, then a coating liquid is applied to the surface of the printed material, and the coating is uniformly applied by a comma scraper. The material is then dried and cured at 70-90°C for 5-10 minutes to obtain the dye layer.

7. The method for preparing the transfer anti-theft film-based EAS tag according to claim 1, characterized in that, The coating solution is prepared as follows: Crystal violet lactone, 4-hydroxy-4'-isopropoxydiphenyl sulfone, and dibutyl phthalate are added to a reaction vessel. The reaction vessel is set at a temperature of 70-80℃, and the stirring speed is 200-400 r / min. The mixture is kept at this temperature and stirred for 20-30 min to obtain the core material. Melamine, formaldehyde solution, and urea are then added to the reaction vessel. The reaction vessel is set at a temperature of 60-70℃, and the stirring speed is 400-600 r / min. The mixture is kept at this temperature and stirred for 10-20 min. Triethanolamine is then added dropwise to adjust the pH value. Adjust the pH to 8.5 to obtain a solution. Add bisphenol A, deionized water, and sodium lignosulfonate to a mixer. Set the mixer to 400–600 rpm and stir for 40–60 minutes to obtain a dispersant. Add the core material, solution, and dispersant to the mixer. Add gum arabic and deionized water to the mixer. Set the mixer to 60–100 rpm and stir for 40–60 minutes. Send the resulting product to a high-speed shear mill and process at 10,000–15,000 rpm for 10–20 minutes to obtain an emulsion. Use lemon... Citric acid was used to adjust the pH of the emulsion to 5.

5. The emulsion was then reacted at 60–70°C for 2–4 hours. The resulting product was rinsed with deionized water and then vacuum dried at 40–50°C for 6–8 hours to obtain a powder. The powder, waterborne polyurethane, silicone defoamer, and UV326 were mixed to obtain a coating liquid. The mass ratio of crystal violet lactone, 4-hydroxy-4'-isopropoxydiphenyl sulfone, and dibutyl phthalate was 1:(1.5–2):(0.4–0.6). Melamine, The mass ratio of formaldehyde solution to urea is 1:(2-3):(0.2-0.4), the mass concentration of formaldehyde solution is 30-40%, and the mass of the solution is 4-6 times the mass of the core material. The mass ratio of bisphenol A, deionized water, and sodium lignosulfonate is 1:(4-6):(0.1-0.3), the mass of dispersant is 6-8% of the mass of the solution, and the mass ratio of powder, waterborne polyurethane, silicone defoamer, and UV326 is 1:(0.6-0.8):(0.04-0.06):(0.04-0.06).

8. The method for preparing the transfer anti-theft film-based EAS tag according to claim 1, characterized in that, The method for preparing the adhesive layer is as follows: acrylic adhesive is coated onto the surface of the dye layer using an anilox roller, and photodegradable adhesive is coated using a slit-type die. After coating, the adhesive layer is dried at 80-100°C for 1-2 minutes to obtain the adhesive layer. 3-5% benzophenone is added to the photodegradable adhesive.

9. The method for preparing the transfer anti-theft film-based EAS tag according to claim 1, characterized in that, The method for preparing the circuit layer is as follows: an antenna pattern is etched on the surface of a silver-aluminum composite foil using a laser engraving machine, and then polypyrrole is coated using a dispensing machine. The chip is then flip-chip bonded to obtain the circuit layer.

10. The method for preparing the transfer anti-theft film-based EAS tag according to claim 1, characterized in that, The method for preparing the base paper layer is as follows: after the glassine paper is treated by an atmospheric plasma spray gun, an organosilicon release agent is coated on the surface of the glassine paper by a gravure roller, and it is cured at 120-150°C for 30-60 seconds. The circuit layer and the base paper layer are then applied to the adhesive layer surface in sequence, and the transfer anti-theft film base EAS label is obtained by roller pressing.

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