Anti-counterfeiting flexible packaging film material and preparation process thereof

Abstract

The invention discloses an anti-counterfeiting flexible packaging film material and a preparation process thereof, belongs to the technical field of packaging material preparation, and aims to solve the technical problem that the anti-counterfeiting performance and the mechanical property of a packaging material in the prior art need to be further improved. Modified polyurethane, zinc-carboxylate cluster polyester and phosphorus-containing polysiloxane are synergistically compounded to construct a multi-scale structure with a flexible matrix, physical crosslinking and an inorganic skeleton, and the prepared anti-counterfeiting flexible package film has high strength and high ductility in mechanical properties and still keeps excellent stability after thermal aging; a phosphorus-silicon synergistic gas phase flame suppression and condensed phase vitrification barrier is formed in the aspect of flame retardance; the anti-counterfeiting packaging film has stable optical fingerprints under ultraviolet light in anti-counterfeiting performance and has reversible color change characteristics under the action of tensile stress, static and dynamic dual verification is realized, and the overall performance of the anti-counterfeiting packaging film is obviously superior to that of a conventional packaging film.

Description

Technical Field

[0001] This invention relates to the field of packaging material preparation technology, specifically to an anti-counterfeiting flexible packaging film material and its preparation process. Background Technology

[0002] In terms of mechanical properties, packaging materials have mainly evolved from general-purpose polyolefins to functionalized polyesters, polyurethanes and other polymers. Polyethylene and polypropylene films have good processability and cost advantages, but their mechanical properties are limited. With the improvement of application requirements, polyester and polyurethane films have been gradually used. The introduction of hard and soft segments into their molecular structure has enabled the materials to perform better in terms of tensile strength, elongation at break and heat resistance. At the same time, the application of multilayer co-extrusion and composite processes has further improved the toughness and stability of packaging films.

[0003] In terms of anti-counterfeiting performance, early methods mainly used physical means such as printed patterns, watermarks, and embossing, which were intuitive and easy to identify. Subsequently, fluorescent inks, photoluminescent pigments, and holographic technology were gradually introduced to enhance the recognizability through optical effects. In addition, materials such as doped rare earth luminescent powders and quantum dots were also used to give the film material characteristic optical signals, which facilitated verification under ultraviolet or specific light sources. In recent years, some materials have also combined element doping, optical scattering, and microstructure control, making the anti-counterfeiting forms more diversified.

[0004] However, traditional packaging film materials still have shortcomings in terms of mechanical properties and long-term durability. While traditional films such as polyethylene and polypropylene are flexible, their strength is limited, making it difficult to simultaneously meet the dual requirements of high strength and high elongation. Polyester and polyurethane materials improve overall performance through molecular structure regulation, but under stress, chain segment orientation and stacking are still prone to localized concentration, leading to crack initiation and decreased toughness. Furthermore, the lack of stable physical cross-linking or skeletal support causes them to exhibit structural relaxation and performance degradation under long-term loads or complex environments. Especially under thermal aging or humid conditions, the mechanical retention rate of some materials decreases significantly, making it difficult to maintain long-term stable use. This limits the current processes from simultaneously meeting the requirements of high strength, durability, and stability. Meanwhile, anti-counterfeiting methods are mostly concentrated on surface printing and optical doping. Although printing patterns, watermarks, holographic films and other methods can create intuitive differences, they are not durable enough and are easily worn or copied. Optical anti-counterfeiting methods such as fluorescent inks, luminescent pigments and quantum dots can be identified under specific light sources, but most of them rely on a single static signal and are difficult to provide multi-dimensional verification. At the same time, these luminescent systems are prone to color drift and luminescence decay under long-term light, heat, oxygen or humidity, which leads to a decrease in identification stability. Some high-end doping solutions can improve the identification effect in the short term, but their compatibility with polymer matrix is ​​poor, which often leads to uneven distribution of luminescent centers and batch-to-batch differences, thus affecting reliability. It is evident that existing technologies still fall short in achieving multi-layered and long-term stable anti-counterfeiting effects. Therefore, a solution is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide an anti-counterfeiting flexible packaging film material and its preparation process, which solves the technical problem that the anti-counterfeiting performance and mechanical properties of packaging materials in the prior art need to be further improved.

[0006] The objective of this invention can be achieved through the following technical solution: a preparation process for an anti-counterfeiting flexible packaging film material, comprising the following steps: S1. Add modified polyurethane and N,N-dimethylformamide to a mixing tank and stir until transparent to obtain material A; S2. Add zinc-carboxylate cluster polyester and N,N-dimethylformamide to a stirred tank and stir at room temperature for 40-60 min to obtain material B; S3. Add phosphorus-containing polysiloxane and acetone to a mixing tank and stir at room temperature for 40-60 minutes to obtain material C; S4. After adding material A to the mixing tank and stirring, add material B and 2,6-di-tert-butyl-p-cresol to the mixing tank. Stir at room temperature for 20-30 minutes, then add material C to the mixing tank and continue stirring for 20-30 minutes to obtain the mixture. S5. After degassing the mixture, filter it using a 0.45µm PTFE pleated filter element and add it to the coating tank. After coating, dry it and demold to obtain an anti-counterfeiting soft packaging film with a thickness of 40µm.

[0007] Furthermore, in step S1, the ratio of modified polyurethane to N,N-dimethylformamide is 6g:12-16mL. Furthermore, in step S2, the ratio of zinc-carboxylate cluster polyester to N,N-dimethylformamide is 1g:4-5mL; Furthermore, in step S3, the ratio of phosphorus-containing polysiloxane to acetone is 1g:24mL. Furthermore, in step S4, the ratio of A, B, 2,6-di-tert-butyl-p-cresol, and C is 160mL:120mL:1-2g:120mL. Furthermore, in step S5, the degassing operation is as follows: the mixture is added to a degassing tank with a pressure of -0.08MPa and degassed for 30 minutes; the drying operation is as follows: after coating, the material is transferred to a drying oven at a temperature of 60℃ and left to stand for 5 minutes, then the temperature of the drying oven is raised to 80℃ and left to stand for 10 minutes, then the temperature is raised to 110℃ and left to stand for 15 minutes, then the temperature of the drying oven is lowered to 80℃ and kept warm for 2 hours.

[0008] Furthermore, in step S1, the preparation method of modified polyurethane includes the following steps: A1. Sorbitol glycidyl ether, tetrabutylammonium bromide and N,N-dimethylformamide were added to a high-pressure reactor and stirred. The high-pressure reactor was then sealed and carbon dioxide gas was introduced. The temperature of the high-pressure reactor was raised to 95-100℃ and kept at that temperature for 7-8 hours. The modified cyclic carbonate was obtained after post-treatment. A2. Modified cyclic carbonate and N,N-dimethylformamide were added to a reaction vessel and stirred. Under nitrogen protection, p-phenylenediamine was added and the reaction vessel was heated to 100°C. The mixture was stirred and reacted for 8 hours. The modified polyurethane was then obtained after post-treatment.

[0009] The reaction principle for preparing polyurethane is as follows: Under high pressure Under certain conditions, the epoxy groups in sorbitol glycidyl ether react with... An insertion reaction occurs, generating a cyclic carbonate monomer with a five-membered ring structure. This reaction proceeds in the presence of a quaternary ammonium salt or other catalyst. Insertion into the epoxy group forms a carbonate ring, thereby converting the original electrophilic carbon into a carbonate ring. By adjusting the reaction conditions to achieve a more stable cyclic structure, it is possible to efficiently generate well-structured cyclic carbonates while retaining multiple reaction sites in the molecule for subsequent polymerization. Next, the cyclic carbonate monomer undergoes a nucleophilic addition reaction of the amino group to the cyclic carbonate under heating conditions. The amino group attacks the carbonyl carbon atom, causing the carbonate ring to break and generating a polyurethane bond (-NH-COO-). This reaction has high selectivity and gradually forms a linear polymer chain, realizing the construction of polyurethane and finally preparing modified polyurethane.

[0010] Further, in step A1, the ratio of sorbitol glycidyl ether, tetrabutylammonium bromide, N,N-dimethylformamide and carbon dioxide is 10-12 g: 0.5 g: 96-100 mL: 0.5-0.6 MPa. The post-treatment includes: after the reaction is completed, wait for the temperature of the reaction vessel to drop to room temperature, transfer the reaction solution to a rotary evaporator at 80°C, and distill under reduced pressure until no liquid is collected to obtain modified cyclic carbonate. Further, in step A2, the ratio of modified cyclic carbonate, N,N-dimethylformamide, and p-phenylenediamine is 5.4 g: 8-10 g: 50-60 mL. The post-treatment includes: cooling after the reaction is completed, pouring a large amount of deionized water to precipitate, collecting the filter cake by suction filtration, washing the filter cake 3-5 times with anhydrous ethanol and deionized water, transferring the filter cake to an 80°C vacuum drying oven and drying it to constant weight to obtain modified polyurethane.

[0011] Furthermore, in step S2, the preparation method of the zinc-carboxylate cluster polyester includes the following steps: B1. Neopentyl glycol, isosorbide, adipic acid, dimethylolpropionic acid, coumarin glycol, p-toluenesulfonic acid, 2,6-di-tert-butyl-p-cresol and xylene are added to a reactor. After nitrogen protection, the reactor is heated to the reaction conditions and refluxed. After reflux for 6-8 hours, the branched polyester is obtained by post-treatment. B2. Branched polyester and N,N-dimethylformamide are added to a reaction vessel and stirred. Under nitrogen protection, potassium carbonate and zinc acetate are added to the reaction vessel and the temperature of the reaction vessel is raised to 50-60℃. The mixture is kept at this temperature and stirred for 2-3 hours. The zinc-carboxylate cluster polyester is then obtained through post-treatment.

[0012] The reaction principle for preparing zinc-carboxylate cluster polyesters is as follows: Branched polyesters are generated through the polycondensation reaction of neopentyl glycol, isosorbide, and adipic acid, among other polyols and diacids. In the reaction system, dimethylolpropionic acid introduces a branched structure, endowing the molecule with a certain degree of branching and carboxyl functional groups. The asymmetric dihydroxy structure of isosorbide further enhances the nonlinear arrangement of the molecule. The reaction is carried out under high-temperature reflux conditions in the presence of p-toluenesulfonic acid. The alcohol carboxyl groups condense and dehydrate to form ester bonds, while retaining some unreacted carboxyl groups, providing sites for subsequent functionalization reactions. The introduction of coumarin diol provides photoresponsive groups, expanding the potential for functional applications of the material. The residual carboxyl groups in the branched polyester molecules are further utilized to form a stable zinc-carboxylate coordination structure with the introduced zinc acetate under the assistance of potassium carbonate. Zinc ions coordinate with multiple carboxylate ligands to form a cluster structure, which causes physical crosslinking or quasi-crosslinking networks between polyester segments. This zinc-carboxylate cluster not only enhances the thermal stability and mechanical properties of the material, but also, due to the Lewis acidity of zinc ions, may endow the polymer with certain catalytic, fluorescent, or responsive properties, ultimately yielding a zinc-carboxylate cluster polyester.

[0013] Further, in step B1, the ratio of neopentyl glycol, isosorbide, adipic acid, dimethylolpropionic acid, coumarin glycol, and p-toluenesulfonic acid is 5-6g:4g:8-10g:1-2g:0.03g:0.2g:0.03g:120-150mL. The post-treatment includes: cooling the reaction vessel to 80℃, adding triethylamine of equal mass to p-toluenesulfonic acid, stirring for 30min, filtering while hot, collecting the filtrate, transferring the filtrate to 3-4 times the volume of anhydrous ethanol for precipitation, filtering after precipitation, collecting the filter cake, washing the filter cake 3-5 times with anhydrous ethanol and deionized water, and then transferring the filter cake to an 80℃ vacuum drying oven to dry to constant weight to obtain branched polyester. Further, in step B2, the ratio of branched polyester, N,N-dimethylformamide, potassium carbonate, and zinc acetate is 8-10g:50mL:2-3g:2-3g. The post-treatment includes: after the reaction is completed, wait for the temperature of the reaction vessel to drop to room temperature, pour the reaction solution into 4-5 times the volume of deionized water to precipitate, filter after precipitation, collect the filter cake and wash the filter cake 3-5 times with anhydrous ethanol and deionized water, and then transfer the filter cake to an 80℃ vacuum drying oven to dry to constant weight to obtain zinc-carboxylate cluster polyester.

[0014] Furthermore, in step S3, the preparation method of the phosphorus-containing polysiloxane includes the following steps: C1. Add anhydrous ethanol and deionized water to the reaction vessel and stir. After adjusting the pH of the reaction system to 4-5 with acetic acid, add 3-glycidoxypropyltrimethoxysilane, methyltriethoxysilane and tetraethoxysilane to the reaction vessel and stir at room temperature for 6-8 hours to obtain a modified polysiloxane solution. C2. The modified polysiloxane solution, N,N-dimethylformamide, and calculated amounts of 9,10-dihydro-9-oxo-10-phosphine-10-oxaphenanthroline and triphenylphosphine are added to a reaction vessel, heated to 80-100℃ under nitrogen protection, and stirred for 4-5 hours. The resulting product is a phosphorus-containing polysiloxane after post-treatment.

[0015] The reaction principle for preparing phosphorus-containing polysiloxanes is as follows: 3-Glycidoxypropyltrimethoxysilane (GPTMS), methyltriethoxysilane (MTES), and tetraethoxysilane (TEOS) react with water under acidic conditions. First, they undergo alcoholysis and hydrolysis to generate silanol (Si-OH) structures. Then, through condensation reactions, Si-O-Si bonds are formed, gradually constructing a polysiloxane network containing epoxy functional groups. The epoxy groups of GPTMS provide subsequent functionalization sites, MTES introduces hydrophobic methyl side groups to enhance the flexibility and weather resistance of the film, and TEOS serves as an inorganic crosslinking node to improve the structural compactness and thermal stability of the system. The epoxy functional groups in the modified polysiloxane solution undergo ring-opening addition with 9,10-dihydro-9-oxo-10-phosphine-10-oxaphenanthroline (DOPO) under heating and alkaline conditions to form a stable COP bond structure, thereby introducing phosphorus into the polysiloxane backbone. At the same time, the addition of triphenylphosphine can promote the activation of DOPO and increase the reaction rate. The introduction of this structure not only provides potential flame retardancy, but may also endow the material with excellent optical or photoresponse properties.

[0016] Furthermore, in step C1, the ratio of anhydrous ethanol, deionized water, 3-glycidoxypropyltrimethoxysilane, methyltriethoxysilane and tetraethoxysilane is 80mL:20mL:8-10g:3-5g:1g. Further, in step C2, the ratio of modified polysiloxane solution, N,N-dimethylformamide, and triphenylphosphine is 10 mL:10 mL:0.1 g, wherein the amount of 9,10-dihydro-9-oxo-10-phosphine-10-oxaphenanthroline added is 1.05-1.10 times the molar amount of epoxy groups in the reaction system. The post-treatment includes: after the reaction is completed, after the temperature of the reaction vessel is reduced to room temperature, the reaction solution is poured into 4-5 times the volume of anhydrous ethanol to precipitate. After precipitation, the mixture is filtered, the filter cake is collected, and the filter cake is washed 3-5 times with anhydrous ethanol and deionized water. The filter cake is then transferred to an 80°C vacuum drying oven and dried to constant weight to obtain phosphorus-containing polysiloxane.

[0017] One of the anti-counterfeiting flexible packaging film materials is prepared using the aforementioned preparation process for an anti-counterfeiting flexible packaging film material.

[0018] The present invention has the following beneficial effects: The modified polyurethane prepared in this invention serves as the main matrix. The molecular chain contains numerous flexible segments and hydrogen bonds, endowing the membrane with excellent ductility and energy buffering capacity, providing the material with high elongation at break. Secondly, the introduction of zinc-carboxylate cluster polyester forms quasi-physical crosslinking points in the polymer system. The cluster structure not only enhances the intermolecular forces but also disperses stress under external forces, preventing chain segment breakage caused by stress concentration, thereby effectively improving tensile strength. Simultaneously, the branched structure of this type of polyester improves the entanglement between molecular chains, further enhancing toughness. Finally, the introduction of phosphorus-containing polysiloxane forms an inorganic-organic hybrid network within the matrix. The Si-O-Si main chain provides high bond energy and a rigid framework, improving overall load-bearing capacity. However, due to its good compatibility with the organic phase, it does not sacrifice the membrane's flexibility. Ultimately, through reasonable proportioning and structural complementarity, the material possesses both rigid reinforcement and flexible ductility, thus simultaneously achieving high tensile strength and elongation at break, exhibiting excellent comprehensive tensile properties.

[0019] The modified polyurethane prepared by this invention provides a uniform and dense film-forming structure, offering a good carrier for the distribution of flame-retardant components and the inorganic framework. The zinc-carboxylate cluster polyester... The coordination clusters with carboxyl groups can promote char formation in the material during high-temperature combustion and form a stable char layer, effectively blocking the continued penetration of heat and oxygen, thereby inhibiting the spread of combustion. At the same time, the introduction of phosphorus-containing polysiloxane further plays a dual role. On the one hand, the DOPO group can release phosphorus-containing free radicals when heated, capturing high-energy free radicals during combustion and reducing the flame propagation rate. On the other hand, the Si-O-Si backbone is transformed into a stable inorganic silicon oxide layer at high temperature, forming a dense protective barrier. In addition, the high bond energy structure of the phosphorus-containing groups and silicon-oxygen skeleton can effectively inhibit free radical chain degradation in a thermo-oxidative environment. Combined with the antioxidant clustering effect, the mechanical retention rate of the film under long-term high-temperature aging conditions is significantly improved, thus endowing the material with excellent flame retardancy and heat aging resistance.

[0020] The modified polyurethane prepared in this invention provides a transparent and flexible matrix environment, enabling uniform dispersion of fluorescent units. The interaction between the coordinating clusters in the zinc-carboxylate cluster polyester and the coumarin units allows the material to exhibit a stable and well-defined optical emission fingerprint under ultraviolet light excitation. The introduction of phosphorus-containing polysiloxane further stabilizes the system structure, ensuring long-term consistency of luminescent properties, thus constructing an optical identification feature that is difficult to imitate. On the other hand, under external tensile force, the coordination between the zinc-carboxylate clusters and polymer segments, as well as the stacking state of coumarin molecules, undergo reversible adjustment, leading to changes in the energy transfer channels of the luminescent center, resulting in a color shift under ultraviolet light, i.e., the "stretch color change" effect. This stress-responsive luminescence feature endows the film material with dynamic anti-counterfeiting functionality, enabling it to not only verify authenticity through optical fingerprints under static conditions but also exhibit unique color changes under external force disturbances, forming a multi-dimensional anti-counterfeiting mechanism. Ultimately, the synergistic effect of the three substrates ensures this dual anti-counterfeiting effect of optical and force-responsive properties, significantly improving the material's security and non-replicability. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 The color development of the anti-counterfeiting flexible packaging film prepared in Example 12 of this invention under ultraviolet light before stretching; Figure 2 The color development of the anti-counterfeiting flexible packaging film prepared in Example 12 of this invention under ultraviolet light after stretching. Detailed Implementation

[0023] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In this application, the sorbitol glycidyl ether used was purchased from Guangdong Wengjiang Chemical Reagent Co., Ltd., with the product number PB41720.

[0025] Example 1 This embodiment provides a preparation process for modified polyurethane for anti-counterfeiting flexible packaging film materials, including the following steps: Step I: Preparation of modified cyclic carbonates Weigh out 100.0g of sorbitol glycidyl ether, 5.0g of tetrabutylammonium bromide and 9600.0mL of N,N-dimethylformamide and add them to a high-pressure reactor. Stir the mixture, seal the high-pressure reactor and introduce carbon dioxide gas at 5.0MPa. Then, raise the temperature of the high-pressure reactor to 95℃ and maintain the temperature for 7 hours. After the reaction is complete, wait for the temperature of the reactor to drop to room temperature, transfer the reaction solution to a rotary evaporator at 80℃, and distill it under reduced pressure until no liquid is collected to obtain modified cyclic carbonate.

[0026] Step II: Preparation of modified polyurethane Weigh 100.0 g of modified cyclic carbonate and 500.0 mL of N,N-dimethylformamide and add them to the reaction vessel and stir. Under nitrogen protection, add 54.0 g of p-phenylenediamine and heat the reaction vessel to 100 °C. Stir and react for 8 h. After the reaction is completed, cool and pour in a large amount of deionized water to precipitate. Collect the filter cake by suction filtration and wash the filter cake three times with anhydrous ethanol and deionized water. Transfer the filter cake to an 80 °C vacuum drying oven and dry to constant weight to obtain modified polyurethane.

[0027] Example 2 This embodiment provides a preparation process for modified polyurethane for anti-counterfeiting flexible packaging film materials, including the following steps: Step I: Preparation of modified cyclic carbonates Weigh out 120.0g of sorbitol glycidyl ether, 5.0g of tetrabutylammonium bromide and 1000.0mL of N,N-dimethylformamide and add them to a high-pressure reactor. Stir the mixture, seal the high-pressure reactor and introduce carbon dioxide gas at 6.0MPa. Then, raise the temperature of the high-pressure reactor to 100℃ and keep it at that temperature for 8 hours. After the reaction is complete, wait for the temperature of the reactor to drop to room temperature, and then transfer the reaction solution to a rotary evaporator at 80℃. Distill the solution under reduced pressure until no liquid is collected to obtain the modified cyclic carbonate.

[0028] Step II: Preparation of modified polyurethane Weigh 100.0 g of modified cyclic carbonate and 600.0 mL of N,N-dimethylformamide and add them to the reaction vessel and stir. Under nitrogen protection, add 54.0 g of p-phenylenediamine and heat the reaction vessel to 100 °C. Stir and react for 8 h. After the reaction is completed, cool and pour in a large amount of deionized water to precipitate. Collect the filter cake by suction filtration and wash the filter cake 5 times with anhydrous ethanol and deionized water. Transfer the filter cake to an 80 °C vacuum drying oven and dry to constant weight to obtain modified polyurethane.

[0029] Example 3 This embodiment provides a preparation process for modified polyurethane for anti-counterfeiting flexible packaging film materials, including the following steps: Step I: Preparation of modified cyclic carbonates Weigh out 120.0g of sorbitol glycidyl ether, 5.0g of tetrabutylammonium bromide and 1000.0mL of N,N-dimethylformamide and add them to a high-pressure reactor. Stir the mixture, seal the high-pressure reactor and introduce carbon dioxide gas at 6.0MPa. Then, raise the temperature of the high-pressure reactor to 100℃ and keep it at that temperature for 8 hours. After the reaction is complete, wait for the temperature of the reactor to drop to room temperature, and then transfer the reaction solution to a rotary evaporator at 80℃. Distill the solution under reduced pressure until no liquid is collected to obtain the modified cyclic carbonate.

[0030] Step II: Preparation of modified polyurethane Weigh 100.0 g of modified cyclic carbonate and 600.0 mL of N,N-dimethylformamide and add them to the reaction vessel and stir. Under nitrogen protection, add 54.0 g of p-phenylenediamine and heat the reaction vessel to 100 °C. Stir and react for 8 h. After the reaction is complete, cool and pour in a large amount of deionized water to precipitate. Collect the filter cake by suction filtration and wash the filter cake 4 times with anhydrous ethanol and deionized water. Transfer the filter cake to an 80 °C vacuum drying oven and dry to constant weight to obtain modified polyurethane.

[0031] Example 4 This embodiment provides a preparation process for zinc-carboxylate cluster polyester used in the preparation of anti-counterfeiting flexible packaging film materials, including the following steps: Step ①: Preparation of branched polyester Weigh out 50.0g neopentyl glycol, 40.0g isosorbide, 80.0g adipic acid, 10.0g dimethylolpropionic acid, 0.3g coumarin glycol, 2.0g p-toluenesulfonic acid, 0.3g 2,6-di-tert-butyl-p-cresol, and 1200.0mL xylene and add them to a reaction vessel. After purging with nitrogen, heat the reaction vessel to the reaction conditions and reflux. After reflux for 6 hours, cool the reaction vessel to 80℃ and add triethylamine of equal mass to p-toluenesulfonic acid. Stir for 30 minutes, filter while hot, collect the filtrate, and transfer the filtrate to 3 times its volume of anhydrous ethanol to precipitate. After precipitation, filter under vacuum, collect the filter cake, and wash the filter cake 3 times with anhydrous ethanol and deionized water. Transfer the filter cake to an 80℃ vacuum drying oven and dry to constant weight to obtain branched polyester.

[0032] Step ②: Preparation of zinc-carboxylate cluster polyester Weigh 80.0 g of branched polyester and 500.0 mL of N,N-dimethylformamide and add them to the reaction vessel and stir. Under nitrogen protection, add 20.0 g of potassium carbonate and 20.0 g of zinc acetate to the reaction vessel and raise the temperature of the reaction vessel to 50 °C. Keep the temperature and stir for 2 h. After the reaction is completed, wait for the temperature of the reaction vessel to drop to room temperature, pour the reaction solution into 4 times the volume of deionized water to precipitate. After precipitation, filter, collect the filter cake and wash the filter cake 3 times with anhydrous ethanol and deionized water. Transfer the filter cake to an 80 °C vacuum drying oven and dry it to constant weight to obtain zinc-carboxylate cluster polyester.

[0033] Example 5 This embodiment provides a preparation process for zinc-carboxylate cluster polyester used in the preparation of anti-counterfeiting flexible packaging film materials, including the following steps: Step ①: Preparation of branched polyester Weigh out 60.0g neopentyl glycol, 40.0g isosorbide, 100.0g adipic acid, 20.0g dimethylolpropionic acid, 0.3g coumarin glycol, 2.0g p-toluenesulfonic acid, 0.3g 2,6-di-tert-butyl-p-cresol, and 1500.0mL xylene and add them to a reaction vessel. After purging with nitrogen, heat the reaction vessel to the reaction conditions and reflux. After reflux for 8 hours, cool the reaction vessel to 80℃ and add triethylamine of equal mass to p-toluenesulfonic acid. Stir for 30 minutes, filter while hot, collect the filtrate, and transfer the filtrate to 4 times its volume of anhydrous ethanol for precipitation. After precipitation, filter under vacuum, collect the filter cake, and wash the filter cake 5 times with anhydrous ethanol and deionized water. Transfer the filter cake to an 80℃ vacuum drying oven and dry to constant weight to obtain branched polyester.

[0034] Step ②: Preparation of zinc-carboxylate cluster polyester Weigh 100.0 g of branched polyester and 500.0 mL of N,N-dimethylformamide and add them to the reaction vessel and stir. Under nitrogen protection, add 30.0 g of potassium carbonate and 30.0 g of zinc acetate to the reaction vessel and raise the temperature of the reaction vessel to 60 °C. Keep the temperature and stir for 3 h. After the reaction is completed, wait for the temperature of the reaction vessel to drop to room temperature, pour the reaction solution into 5 times the volume of deionized water to precipitate. After precipitation, filter, collect the filter cake and wash the filter cake 5 times with anhydrous ethanol and deionized water. Transfer the filter cake to an 80 °C vacuum drying oven and dry it to constant weight to obtain zinc-carboxylate cluster polyester.

[0035] Example 6 This embodiment provides a preparation process for zinc-carboxylate cluster polyester used in the preparation of anti-counterfeiting flexible packaging film materials, including the following steps: Step ①: Preparation of branched polyester Weigh out 54.0g neopentyl glycol, 40.0g isosorbide, 96.0g adipic acid, 16.0g dimethylolpropionic acid, 0.3g coumarin glycol, 2.0g p-toluenesulfonic acid, 0.3g 2,6-di-tert-butyl-p-cresol, and 1350.0mL xylene and add them to a reaction vessel. After purging with nitrogen, heat the reaction vessel to the reaction conditions and reflux. After reflux for 7 hours, cool the reaction vessel to 80℃ and add triethylamine of equal mass to p-toluenesulfonic acid. Stir for 30 minutes, filter while hot, collect the filtrate, and transfer the filtrate to 4 times its volume of anhydrous ethanol to precipitate. After precipitation, filter under vacuum, collect the filter cake, and wash the filter cake 4 times with anhydrous ethanol and deionized water. Transfer the filter cake to an 80℃ vacuum drying oven and dry to constant weight to obtain branched polyester.

[0036] Step ②: Preparation of zinc-carboxylate cluster polyester Weigh 90.0 g of branched polyester and 500.0 mL of N,N-dimethylformamide and add them to the reaction vessel and stir. Under nitrogen protection, add 24.0 g of potassium carbonate and 24.0 g of zinc acetate to the reaction vessel and raise the temperature of the reaction vessel to 55 °C. Keep the temperature and stir for 3 h. After the reaction is completed, wait for the temperature of the reaction vessel to drop to room temperature, pour the reaction solution into 5 times the volume of deionized water to precipitate. After precipitation, filter, collect the filter cake and wash the filter cake 4 times with anhydrous ethanol and deionized water. Transfer the filter cake to an 80 °C vacuum drying oven and dry it to constant weight to obtain zinc-carboxylate cluster polyester.

[0037] Example 7 This embodiment provides a preparation process for phosphorus-containing polysiloxane used in the preparation of anti-counterfeiting flexible packaging film materials, including the following steps: Step (1): Preparation of modified polysiloxane solution Weigh out 800.0 mL of anhydrous ethanol and 200.0 mL of deionized water and add them to the reaction vessel. After adjusting the pH of the reaction system to 4 with acetic acid, add 80.0 g of 3-glycidoxypropyltrimethoxysilane, 30.0 g of methyltriethoxysilane and 10.0 g of tetraethoxysilane to the reaction vessel and stir at room temperature for 6 h to obtain a modified polysiloxane solution.

[0038] Step 2: Preparation of phosphorus-containing polysiloxane Weigh out 100.0 mL of modified polysiloxane solution, 100.0 mL of N,N-dimethylformamide, 9,10-dihydro-9-oxo-10-phosphine-10-oxaphenanthroline (1.05 times the molar amount of epoxy groups in the reaction system), and 0.1 g of triphenylphosphine, and add them to the reaction vessel. Heat to 80 °C under nitrogen protection and stir for 4 h. After the reaction is complete, wait for the temperature of the reaction vessel to drop to room temperature, pour the reaction solution into 4 times the volume of anhydrous ethanol to precipitate. After precipitation, filter, collect the filter cake, and wash the filter cake 3 times with anhydrous ethanol and deionized water. Transfer the filter cake to an 80 °C vacuum drying oven and dry to constant weight to obtain phosphorus-containing polysiloxane.

[0039] Example 8 This embodiment provides a preparation process for phosphorus-containing polysiloxane used in the preparation of anti-counterfeiting flexible packaging film materials, including the following steps: Step (1): Preparation of modified polysiloxane solution Weigh out 800.0 mL of anhydrous ethanol and 200.0 mL of deionized water and add them to the reaction vessel. After adjusting the pH of the reaction system to 5 with acetic acid, add 100.0 g of 3-glycidoxypropyltrimethoxysilane, 50.0 g of methyltriethoxysilane and 10.0 g of tetraethoxysilane to the reaction vessel and stir at room temperature for 8 h to obtain a modified polysiloxane solution.

[0040] Step 2: Preparation of phosphorus-containing polysiloxane Weigh out 100.0 mL of modified polysiloxane solution, 100.0 mL of N,N-dimethylformamide, 9,10-dihydro-9-oxo-10-phosphine-10-oxaphenanthroline (1.10 times the molar amount of epoxy groups in the reaction system), and 1.0 g of triphenylphosphine, and add them to the reaction vessel. Heat to 100 °C under nitrogen protection and stir for 5 h. After the reaction is complete, wait for the temperature of the reaction vessel to drop to room temperature, pour the reaction solution into 4 times the volume of anhydrous ethanol to precipitate. After precipitation, filter, collect the filter cake, and wash the filter cake 5 times with anhydrous ethanol and deionized water. Transfer the filter cake to an 80 °C vacuum drying oven and dry to constant weight to obtain phosphorus-containing polysiloxane.

[0041] Example 9 This embodiment provides a preparation process for phosphorus-containing polysiloxane used in the preparation of anti-counterfeiting flexible packaging film materials, including the following steps: Step (1): Preparation of modified polysiloxane solution Weigh out 800.0 mL of anhydrous ethanol and 200.0 mL of deionized water and add them to the reaction vessel. After adjusting the pH of the reaction system to 4 with acetic acid, add 90.0 g of 3-glycidoxypropyltrimethoxysilane, 40.0 g of methyltriethoxysilane and 10.0 g of tetraethoxysilane to the reaction vessel and stir at room temperature for 7 h to obtain a modified polysiloxane solution.

[0042] Step 2: Preparation of phosphorus-containing polysiloxane Weigh out 100.0 mL of modified polysiloxane solution, 100.0 mL of N,N-dimethylformamide, 9,10-dihydro-9-oxo-10-phosphine-10-oxaphenanthroline (1.08 times the molar amount of epoxy groups in the reaction system), and 0.1 g of triphenylphosphine, and add them to the reaction vessel. Heat to 90 °C under nitrogen protection and stir for 5 h. After the reaction is complete, wait for the temperature of the reaction vessel to drop to room temperature, pour the reaction solution into 5 times the volume of anhydrous ethanol to precipitate. After precipitation, filter, collect the filter cake, and wash the filter cake 4 times with anhydrous ethanol and deionized water. Transfer the filter cake to an 80 °C vacuum drying oven and dry to constant weight to obtain phosphorus-containing polysiloxane.

[0043] Example 10 This embodiment provides a preparation process for an anti-counterfeiting flexible packaging film material, including the following steps: Step 1: Preparation of Material A Weigh 60.0g of the modified polyurethane prepared in Example 1 and 120.0mL of N,N-dimethylformamide and add them to a stirred tank. Stir until transparent to obtain material A.

[0044] Step 2: Preparation of Material B Weigh 25.0g of the zinc-carboxylate cluster polyester prepared in Example 4 and 120.0mL of N,N-dimethylformamide and add them to a stirred tank. Stir at room temperature for 40min to obtain material B.

[0045] Step 3: Preparation of C material Weigh 5.0g of the phosphorus-containing polysiloxane prepared in Example 7 and 120.0mL of acetone and add them to a stirring vessel. Stir at room temperature for 40min to obtain material C.

[0046] Step 4: Prepare the mixture Weigh out 160.0 mL of material A and add it to the mixing tank. Then add 120.0 mL of material B and 1.0 g of 2,6-di-tert-butyl-p-cresol to the mixing tank. Stir at room temperature for 20 min. Then add 120.0 mL of material C to the mixing tank and continue stirring for 20 min to obtain the mixture.

[0047] Step 5: Prepare anti-counterfeiting flexible packaging film Weigh 360.0 mL of the mixture and add it to a degassing tank with a pressure of -0.08 MPa. After degassing for 30 min, filter it using a 0.45 µm PTFE pleated filter and add it to the coating tank. After coating, dry the material and transfer it to a drying oven at 60 °C. Let it stand for 5 min, then raise the temperature of the drying oven to 80 °C and let it stand for 10 min. Then raise the temperature to 110 °C and let it stand for 15 min. Finally, lower the temperature of the drying oven to 80 °C and keep it at that temperature for 2 h. Demold the material to obtain a 40 µm thick anti-counterfeiting soft packaging film.

[0048] Example 11 This embodiment provides a preparation process for an anti-counterfeiting flexible packaging film material, including the following steps: Step 1: Preparation of Material A Weigh out 60.0g of the modified polyurethane prepared in Example 2 and 160.0mL of N,N-dimethylformamide and add them to a stirred tank. Stir until transparent to obtain material A.

[0049] Step 2: Preparation of Material B Weigh 25.0g of the zinc-carboxylate cluster polyester prepared in Example 5 and 175.0mL of N,N-dimethylformamide and add them to a stirred tank. Stir at room temperature for 60min to obtain material B.

[0050] Step 3: Preparation of C material Weigh 5.0g of the phosphorus-containing polysiloxane prepared in Example 8 and add 120.0mL of acetone into a stirred tank and stir at room temperature for 60min to obtain material C.

[0051] Step 4: Prepare the mixture Weigh out 160.0 mL of material A and add it to the mixing tank. After stirring, add 120.0 mL of material B and 2.0 g of 2,6-di-tert-butyl-p-cresol to the mixing tank. Stir at room temperature for 30 min. Then add 120.0 mL of material C to the mixing tank and continue stirring for 30 min to obtain the mixture.

[0052] Step 5: Prepare anti-counterfeiting flexible packaging film Weigh 360.0 mL of the mixture and add it to a degassing tank with a pressure of -0.08 MPa. After degassing for 30 min, filter it using a 0.45 µm PTFE pleated filter and add it to the coating tank. After coating, dry the material and transfer it to a drying oven at 60 °C. Let it stand for 5 min, then raise the temperature of the drying oven to 80 °C and let it stand for 10 min. Then raise the temperature to 110 °C and let it stand for 15 min. Finally, lower the temperature of the drying oven to 80 °C and keep it at that temperature for 2 h. Demold the material to obtain a 40 µm thick anti-counterfeiting soft packaging film.

[0053] Example 12 This embodiment provides a preparation process for an anti-counterfeiting flexible packaging film material, including the following steps: Step 1: Preparation of Material A Weigh 60.0g of the modified polyurethane prepared in Example 3 and 150.0mL of N,N-dimethylformamide and add them to a stirred tank. Stir until transparent to obtain material A.

[0054] Step 2: Preparation of Material B Weigh 25.0g of the zinc-carboxylate cluster polyester prepared in Example 6 and 120.0mL of N,N-dimethylformamide and add them to a stirred tank. Stir at room temperature for 50min to obtain material B.

[0055] Step 3: Preparation of C material Weigh 5.0g of the phosphorus-containing polysiloxane prepared in Example 9 and 120.0mL of acetone and add them to a stirred tank. Stir at room temperature for 60min to obtain material C.

[0056] Step 4: Prepare the mixture Weigh out 160.0 mL of material A and add it to the mixing tank. After stirring, add 120.0 mL of material B and 1.6 g of 2,6-di-tert-butyl-p-cresol to the mixing tank. Stir at room temperature for 25 min. Then add 120.0 mL of material C to the mixing tank and continue stirring for 25 min to obtain the mixture.

[0057] Step 5: Prepare anti-counterfeiting flexible packaging film Weigh 360.0 mL of the mixture and add it to a degassing tank with a pressure of -0.08 MPa. After degassing for 30 min, filter it using a 0.45 µm PTFE pleated filter and add it to the coating tank. After coating, dry the material and transfer it to a drying oven at 60 °C. Let it stand for 5 min, then raise the temperature of the drying oven to 80 °C and let it stand for 10 min. Then raise the temperature to 110 °C and let it stand for 15 min. Finally, lower the temperature of the drying oven to 80 °C and keep it at that temperature for 2 h. Demold the material to obtain a 40 µm thick anti-counterfeiting soft packaging film.

[0058] Comparative Example 1 The difference between this comparative example and Example 12 is that step ② is omitted in the preparation process of the zinc-carboxylate cluster polyester used in step two.

[0059] Comparative Example 2 The difference between this comparative example and Example 12 is that step (2) is omitted in the preparation process of the phosphorus-containing polysiloxane used in step three.

[0060] Comparative Example 3 The difference between this comparative example and Example 12 is that step three is omitted.

[0061] Performance testing: The tensile strength and elongation at break of the anti-counterfeiting flexible packaging films prepared in Examples 10-12 and Comparative Examples 1-3 were determined in accordance with the standard GB / T 1040.3-2006 "Determination of tensile properties of plastics - Part 3: Test conditions for films and sheets". According to standard GB / T 7141-2008 "Test Method for Thermal Aging of Plastics", the anti-counterfeiting flexible packaging films prepared in Examples 10-12 and Comparative Examples 1-3 were placed at a temperature of 90℃ for 500h. The tensile strength retention rate of the anti-counterfeiting flexible packaging films prepared in Examples 10-12 and Comparative Examples 1-3 was tested according to standard GB / T 28117-2011. The vertical flammability ratings of the anti-counterfeiting flexible packaging films prepared in Examples 10-12 and Comparative Examples 1-3 were determined according to the standard GB / T 2408-2021 "Determination of flammability of plastics - Horizontal and Vertical Methods". Under darkroom conditions, the anti-counterfeiting flexible packaging films prepared in Examples 10-12 and Comparative Examples 1-3, along with standard gray cards, were placed in fixed positions and irradiated with 365nm and 254nm ultraviolet light for 10 seconds, respectively. Images were then acquired, and white balance and brightness correction were performed using the gray cards. The CIE color coordinates and brightness ratios of the samples were obtained through image analysis, and calculations were performed. The anti-counterfeiting performance was measured, and the specific data are shown in Table 1. Table 1 - Performance Test Data for Each Sample

[0062] Data Analysis: Comparative analysis of the data in Table 1 reveals that the anti-counterfeiting flexible packaging film prepared by this invention has a tensile strength of 75.1 MPa, an elongation at break of 272%, a tensile strength retention rate of 94.2% after heat aging, and a vertical flammability rating of V-0. The value is 11.2, and all data points are better than the comparative example. This indicates that: After losing the reversible coordination sites and clustered "sacrificial bonds" between chains in Comparative Example 1, the physical cross-linking density and stress transmission channels of the system are significantly reduced. Under the action of external force, the stress cannot be uniformly distributed at the microscale, and local stress concentration is easily formed at defects and interfaces, inducing premature slip of chain segments and microcrack initiation. At the same time, the effective entanglement of branched chains is weakened, and the energy dissipation path is shortened, making it difficult to control the molecular orientation and stacking during deformation. The microphase domain size fluctuation increases, further causing instability of the energy transfer channel of the photoemission center and orientation lag. The above chain effect causes the material to relax faster and the structure fluctuates from the molecular to supramolecular level. The structural integrity and response consistency during the macroscopic deformation process decrease accordingly. After losing the phosphorus-containing groups, Comparative Example 2 no longer effectively intercepts combustion free radicals and promotes char formation in the thermal induction stage. Under the conditions of heating and photothermal coupling, the material is more prone to free radical autocatalytic chain degradation. At the same time, the lack of specific interaction between polar P=O and organic phase at the interface weakens the interfacial bonding and stress transmission continuity of the hybrid network, making the microphase boundary more prone to relaxation and displacement. Meanwhile, due to the reduced efficiency of condensed phase protective layer formation, the heat-oxygen and UV-mediated oxidation process is accelerated, and the microenvironment around the chromophore and luminescent center is more easily disturbed, manifested as increased fluctuations in energy level distribution and orientation hysteresis. The above factors together cause insufficient stability support of the structure under heat-light load and accelerated long-term structural evolution. In Comparative Example 3, the absence of the silicon-oxygen framework resulted in the loss of rigid support and interfacial pinning points for inorganic-organic interpenetration. This led to an increase in the free volume fraction and chain segment mobility within the film, making the size and boundaries of the microphase domains more susceptible to fluctuations with the external field. Consequently, orientation and deorientation during deformation were difficult to effectively constrain. Simultaneously, the lack of a dense barrier between the surface and bulk phase shortened the heat-oxygen and moisture diffusion paths, resulting in faster changes in local polarity and microenvironment. This caused frequent energy transfer and reorganization of the stacked structure near the luminescent center. During the curing and subsequent use stages, the insufficient thermal conductivity and stress release channels made it more difficult for residual stress to dissipate, leading to its accumulation at the interface. This increased the probability of nucleation for microcracks and phase separation. The aforementioned synergistic loss from the interface to the bulk phase amplified the coupling effects of structural relaxation, environmental intrusion, and orientation fluctuations. In conclusion, the modified polyurethane prepared by this invention provides a continuous, uniform, and flexible matrix for the material, giving it excellent film-forming properties and ductility. The zinc-carboxylate cluster polyester forms stable physical crosslinking points and energy transfer channels, significantly improving mechanical strength and durability, and also imparting a visible color response under tensile stress. The phosphorus-containing polysiloxane combines condensed phase charring with inorganic framework support, forming a highly efficient protective barrier during flame retardancy and thermal aging, maintaining long-term stability of optical and mechanical properties. The three substrates complement each other in the system: the flexible segments and rigid framework achieve a balance between strength and toughness; the cluster structure and luminescent center coupling achieve a unified static and dynamic anti-counterfeiting effect; and the phosphorus-silicon synergistic effect ensures a dual improvement in flame retardancy and weather resistance. Through this multi-dimensional coupling effect, the resulting packaging film exhibits excellent overall performance in mechanical properties, flame retardancy and aging resistance, and optical anti-counterfeiting properties.

[0063] 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 specific implementations. 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 process for the preparation of a security soft packaging film material, characterized in that, The method comprises the following steps: S1, the modified polyurethane and N, N-dimethylformamide are added to a stirred tank, and stirring is performed until transparent to obtain A material; S2, the zinc-carboxylate cluster polyester and N, N-dimethylformamide are added to a stirred tank, and stirring is performed at room temperature for 40-60 min to obtain B material; S3, the phosphorus-containing polysiloxane and acetone are added to a stirred tank, and stirring is performed at room temperature for 40-60 min to obtain C material; S4, after the A material is added to a stirred tank and stirred, the B material and 2, 6-di-tert-butyl-p-cresol are added to the stirred tank, stirring is performed at room temperature for 20-30 min, then the C material is added to the stirred tank and continues to be stirred for 20-30 min, and a mixed material is obtained; S5, after the mixed material is degassed, the 0.45 mu m PTFE folded filter element is used for filtering, and then the material is added to a coating tank, dried after coating is completed, and demolded to obtain a security soft packaging film with a thickness of 40 mu m.

2. The process for the preparation of a security soft packaging film material according to claim 1, characterized in that, In step S1, the amount ratio of the modified polyurethane and N, N-dimethylformamide is 6 g: 12-16 mL; in step S2, the amount ratio of the zinc-carboxylate cluster polyester and N, N-dimethylformamide is 1 g: 4-5 mL; in step S3, the amount ratio of the phosphorus-containing polysiloxane and acetone is 1 g: 24 mL; and in step S4, the amount ratio of the A material, the B material, 2, 6-di-tert-butyl-p-cresol and the C material is 160 mL: 120 mL: 1-2 g: 120 mL.

3. The process for the preparation of a security soft packaging film material according to claim 1, characterized in that, In step S1, the preparation method of the modified polyurethane comprises the following steps: A1, sorbitol glycidyl ether, tetrabutylammonium bromide and N, N-dimethylformamide are added to a high-pressure reaction kettle and stirred, the high-pressure reaction kettle is sealed and carbon dioxide gas is introduced, then the temperature of the high-pressure reaction kettle is increased to 95-100 DEG C, and reaction is performed for 7-8 h, and the modified cyclic carbonate is obtained after post-treatment; A2, the modified cyclic carbonate and N, N-dimethylformamide are added to a reaction kettle and stirred, p-phenylenediamine is added under nitrogen protection, and then the reaction kettle is heated to 100 DEG C, and reaction is performed for 8 h, and the modified polyurethane is obtained after post-treatment.

4. The process for the preparation of a security soft packaging film material according to claim 3, characterized in that, In step A1, the amount ratio of sorbitol glycidyl ether, tetrabutylammonium bromide, N, N-dimethylformamide and carbon dioxide is 10-12 g: 0.5 g: 96-100 mL: 0.5-0.6 MPa; and in step A2, the amount ratio of the modified cyclic carbonate, N, N-dimethylformamide and p-phenylenediamine is 8-10 g: 5.4 g: 50-60 mL.

5. The process for the preparation of a security soft packaging film material according to claim 1, characterized in that, In step S2, the preparation method of the zinc-carboxylate cluster polyester comprises the following steps: B1, neopentyl glycol, isosorbide, adipic acid, dimethylol propionic acid, coumarin diol, p-toluenesulfonic acid, 2, 6-di-tert-butyl-p-cresol and dimethylbenzene are added to a reaction kettle, nitrogen protection is introduced, then the reaction kettle is heated to the refluxing condition of reaction, and refluxing is performed for 6-8 h, and the branched polyester is obtained after post-treatment; B2, the branched polyester and N, N-dimethylformamide are added to a reaction kettle and stirred, potassium carbonate and zinc acetate are added to the reaction kettle under nitrogen protection, and then the temperature of the reaction kettle is increased to 50-60 DEG C, and stirring is performed for 2-3 h, and the zinc-carboxylate cluster polyester is obtained after post-treatment.

6. The process for the preparation of a security soft packaging film material according to claim 5, characterized in that, In step B1, the amount ratio of neopentyl glycol, isosorbide, adipic acid, dimethylol propionic acid, coumarin diol, p-toluenesulfonic acid, and deionized water is 5-6g:4g:8-10g:1-2g:0.03g:0.2g:0.03g:120-150mL; in step B2, the amount ratio of branched polyester, N,N-dimethylformamide, potassium carbonate, and zinc acetate is 8-10g:50mL:2-3g:2-3g.

7. The process for preparing a security soft packaging film material according to claim 1, characterized in that, In step S3, the preparation method of the phosphorus-containing polysiloxane comprises the following steps: C1, anhydrous ethanol and deionized water are added to a reaction kettle and stirred, the pH of the reaction system is adjusted to 4-5 using acetic acid, then 3-glycidyloxypropyltrimethoxysilane, methyltriethoxysilane, and tetraethoxysilane are added to the reaction kettle, stirred at room temperature for 6-8h, and a modified polysiloxane solution is obtained; C2, the modified polysiloxane solution, N,N-dimethylformamide, a calculated amount of 9,10-dihydro-9-oxo-10-phospho-10-oxaphenanthrene, and triphenylphosphine are added to a reaction kettle, heated to 80-100℃ under nitrogen protection, and stirred for 4-5h, and then treated to obtain a phosphorus-containing polysiloxane.

8. A process for the preparation of a security soft packaging film material according to claim 7, characterized in that, In step C1, the amount ratio of anhydrous ethanol, deionized water, 3-glycidyloxypropyltrimethoxysilane, methyltriethoxysilane, and tetraethoxysilane is 80mL:20mL:8-10g:3-5g:1g; in step C2, the amount ratio of the modified polysiloxane solution, N,N-dimethylformamide, and triphenylphosphine is 10mL:10mL:0.1g, and the addition amount of 9,10-dihydro-9-oxo-10-phospho-10-oxaphenanthrene is 1.05-1.10 times the molar amount of the epoxy groups in the reaction system.

9. A security soft-pack film material, characterized by The anti-fake soft packaging film material is prepared by the preparation process of the anti-fake soft packaging film material according to any one of claims 1-8.

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