An environmentally friendly laser transfer film for positioning

Abstract

The present invention relates to the field of packaging materials, and specifically to a positioning environmentally friendly laser transfer film, which is composed of a base film layer, a laser information layer, and an aluminized layer; the laser information layer is made of the following raw materials in parts by weight: 60-70 parts of an aqueous polyurethane acrylate resin emulsion, 10-15 parts of a photoinitiator aqueous alkyd resin, 8-12 parts of dipentaerythritol hexaacrylate, 0.1-1 part of a polyether-modified polysiloxane surfactant, 1-5 parts of aminated nano-titanium dioxide, and 1-3 parts of a functional additive. The present invention uses an aqueous laser coating to replace the solvent-based coating to prepare the laser information layer, effectively solving the problems of poor environmental protection performance and poor safety of the solvent-based coating, and realizing the green, efficient, and safe production of vacuum aluminized packaging materials.

Description

Technical Field

[0001] The present invention relates to the field of packaging materials, and particularly to a positioning environmentally friendly laser transfer film. Background Art

[0002] The patterns and texts produced by laser holography technology have special effects of being bright, colorful, and changing. By combining laser holography technology with precise transfer technology, a positioning laser transfer film can be obtained, which is mainly used to accurately transfer laser patterns on substrates such as paper and plastic, achieving decoration, anti-counterfeiting, and environmental protection functions. Its core feature is to form visual effects such as dynamic color change and three-dimensional holography through the principles of light interference and diffraction, and at the same time have high-precision positioning ability.

[0003] Currently, the commonly used laser transfer coatings are mainly solvent-based coatings, and the solvent-based laser transfer coatings have the following deficiencies:

[0004] ① The solid content of the coating is low, containing a large amount of solvents such as alcohols, esters, and ketones, which are not environmentally friendly and safe, bringing pollution to the production environment and the atmospheric environment, and also posing risks to the occupational health of relevant operators, and it is difficult to meet the requirements of food packaging materials;

[0005] ② The interlayer adhesion is low, and the fastness is unstable, resulting in easy separation between layers. Especially under high-temperature conditions, the fastness fluctuates more, making it difficult to control the product quality;

[0006] Therefore, it is necessary to develop a positioning environmentally friendly laser transfer film that can be applied to the field of vacuum aluminized packaging materials, so as to achieve green and safe production in the field of vacuum aluminized packaging materials. Summary of the Invention

[0007] Object of the Invention: Aiming at the above technical problems, the present invention proposes a positioning environmentally friendly laser transfer film.

[0008] The technical solution adopted is as follows:

[0009] A positioning environmentally friendly laser transfer film is composed of a base film layer, a laser information layer, and an aluminized layer;

[0010] The laser information layer is made of the following raw materials in parts by weight:

[0011] 60 - 70 parts of aqueous polyurethane acrylate resin emulsion, 10 - 15 parts of photoinitiator aqueous alkyd resin, 8 - 12 parts of dipentaerythritol hexaacrylate, 0.1 - 1 part of polyether-modified polysiloxane surfactant, 1 - 5 parts of aminated nano-titanium dioxide, 1 - 3 parts of functional additives;

[0012] The preparation method of the photoinitiator aqueous alkyd resin is as follows:

[0013] Stir and heat 2,4-toluene diisocyanate to 60 - 70 °C, then add an organotin catalyst. Subsequently, add the solution obtained by dissolving 4-hydroxybenzophenone in ethyl acetate, keep the temperature for reaction for 5 - 10 h, then concentrate under reduced pressure. Precipitate the product with ether, filter and collect the product, and dry it under vacuum to obtain an intermediate. Under nitrogen protection, add the intermediate, linoleic acid, trimethylolpropane, and phthalic anhydride to xylene, stir and heat to 200 - 210 °C, keep the temperature for reaction for 1 - 5 h, then distill off xylene under reduced pressure. Cool to 150 - 160 °C, add trimellitic anhydride, then heat to 180 - 190 °C and keep the temperature for reaction for 1 - 5 h. Then cool to 100 - 110 °C, add ethylene glycol monobutyl ether, disperse at high speed for 0.5 - 1 h, and then return to room temperature.

[0014] Furthermore, the preparation method of the aqueous polyurethane acrylate resin emulsion is as follows:

[0015] Add diisocyanate, 2,2-dimethylolpropionic acid, and polyester diol to methyl ethyl ketone, stir and heat to 70 - 80 °C for reaction for 1 - 10 h. Subsequently, add hydroxypropyl methacrylate, N,N-dimethylethanolamine, acrylic monomer, and deionized water in sequence. After stirring well to make the mixture uniform, add a radical initiator, continue stirring and reacting for 1 - 10 h, and then distill off methyl ethyl ketone under reduced pressure.

[0016] Furthermore, the acrylic monomer is composed of vinyl-terminated castor oil, acrylic acid, butyl acrylate, and methyl methacrylate with a mass ratio of 1 - 10:1 - 10:1 - 10:1 - 10.

[0017] Furthermore, the vinyl-terminated castor oil is obtained by the esterification reaction of maleic anhydride and castor oil.

[0018] Furthermore, the preparation method of the aminated nano-titanium dioxide is as follows:

[0019] Add ethylenediamine to deionized water, add lysine and tetrabutyl titanate under stirring, adjust the pH of the reaction solution to 10 - 11, then continue stirring for 0.5 - 1 h. Subsequently, transfer it into a hydrothermal reaction kettle, seal it and heat to 100 - 120 °C for reaction for 10 - 20 h, naturally cool to room temperature, filter and collect the product, wash it, and dry it.

[0020] Furthermore, the mass ratio of lysine to tetrabutyl titanate is 1 - 5:1 - 5.

[0021] Furthermore, the functional additives include defoamers, leveling agents, and adhesion promoters.

[0022] Furthermore, the mass ratio of the defoamer, leveling agent, and adhesion promoter is 1 - 5:1 - 5:1 - 5.

[0023] Further, the base film layer is at least one of BOPP film, PET film, PVC film, PLA film, and PBAT film.

[0024] It has the following beneficial effects:

[0025] The present invention provides a positioning environmentally friendly laser transfer film, which uses water-based laser coatings to replace solvent-based coatings to prepare the laser information layer, effectively solving the problems of poor environmental protection performance and poor safety of solvent-based coatings, and realizing the green, efficient, and safe production of vacuum aluminized packaging materials;

[0026] The waterborne polyurethane acrylate resin emulsion not only takes into account various performance characteristics that the transfer coating should possess, but also overcomes the problems of environmental pollution, harm to health, and safety hazards during the production of solvent-based transfer coatings. The introduced vinyl castor oil can form an alternating structure of flexible segments and rigid segments with methyl methacrylate, which can effectively improve the toughness of the coating film;

[0027] The linoleic acid structure in the photoinitiator waterborne alkyd resin endows the coating with elasticity, and the introduction of phthalic anhydride and trimellitic anhydride enhances the crosslinking density, achieving the effect of "combining rigidity and flexibility". The introduction of the benzophenone structure not only improves the photo-curing rate to a certain extent and improves the mechanical properties of the coating film, but also can avoid the toxicity problems caused by the residue and migration of photolysis fragments due to the additional addition of small molecule initiators;

[0028] As a hexafunctional crosslinking agent, dipentaerythritol hexaacrylate forms a dense three-dimensional network structure during UV curing due to its high reactivity, which improves the rigidity of the coating film. The addition of polyether-modified polysiloxane surfactants can improve the wetting performance of the coating film on the base film, avoiding shrinkage holes or fisheye defects during coating. The polyether chain segment can also bind to the amino groups on the surface of amino-functionalized nano-titanium dioxide through hydrogen bonds to form an adsorption layer, providing steric hindrance to prevent the aggregation of amino-functionalized nano-titanium dioxide. During the photoinitiation stage, the ether bond of the polyether chain segment can act as a radical transfer agent to accelerate the crosslinking reaction of dipentaerythritol hexaacrylate and shorten the curing time. Through the flexible deformation of the polysiloxane chain segment, the volume shrinkage stress caused by the resin crosslinking during UV curing is relieved, avoiding microcracks in the aluminized layer due to substrate warping. The amino-functionalized nano-titanium dioxide is uniformly dispersed in the resin matrix, and through multiple mechanisms such as nano-reinforcement, interfacial bonding, photo-thermal synergy, and environmental response, it becomes a means to improve the mechanical strength and high-temperature resistance of the laser transfer film. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic structural diagram of the positioning environmentally friendly laser transfer film in Example 1, and the labels in the figure respectively represent:

[0030] 1 - BOPP base film layer, 2 - laser information layer, 3 - aluminized layer. DETAILED DESCRIPTION OF THE INVENTION

[0031] For those without specific conditions indicated in the examples, they are carried out according to conventional conditions or conditions recommended by the manufacturer. For reagents or instruments without the manufacturer indicated, they are all conventional products that can be obtained by purchasing in the market. Technologies not mentioned in the present invention refer to the prior art. Unless otherwise specified, the following examples and comparative examples are parallel tests and adopt the same treatment steps and parameters.

[0032] Waterborne polyurethane acrylate resin emulsion: self-made;

[0033] Photoinitiator waterborne alkyd resin: self-made;

[0034] Dipentaerythritol hexaacrylate: P-61031 (DPHA), Jining Tangyi Chemical Co., Ltd.;

[0035] Polyether-modified polysiloxane surfactant: Momentive Silwet L-77, Guangzhou Xinhua Teng Technology Co., Ltd.;

[0036] Aminated nano-titanium dioxide: self-made;

[0037] Defoamer BYK-024: BYK of Germany, Jining Fangyu Chemical Co., Ltd.;

[0038] Leveling agent BYK-346: BYK of Germany, Jining Fangyu Chemical Co., Ltd.;

[0039] Adhesion promoter BYK-4500: BYK of Germany, Jining Fangyu Chemical Co., Ltd.

[0040] Example 1:

[0041] A positioning environmentally friendly laser transfer film is composed of a BOPP base film layer 1, a laser information layer 2 and an aluminized layer 3;

[0042] The laser information layer 2 is made of the following raw materials in parts by weight:

[0043] 65 parts of waterborne polyurethane acrylate resin emulsion, 13 parts of photoinitiator waterborne alkyd resin, 10 parts of dipentaerythritol hexaacrylate, 0.5 part of polyether-modified polysiloxane surfactant, 4 parts of aminated nano-titanium dioxide, 0.5 part of defoamer BYK-024, 1 part of leveling agent BYK-346, 1 part of adhesion promoter BYK-4500.

[0044] Among them, the preparation method of the waterborne polyurethane acrylate resin emulsion is as follows:

[0045] Add 100 g of castor oil (industrial grade, hydroxyl value 160 ± 5 mg KOH / g, Sinopharm Group), 30 g of maleic anhydride, 1.5 g of N,N-dimethylbenzylamine, and 500 ml of xylene into a three-necked flask equipped with a condenser and a water separator. Heat up to 120 °C and react for 5 h. After the reaction, restore to room temperature, add 500 ml of saturated sodium carbonate solution for washing, separate the organic phase, and concentrate under reduced pressure to obtain carboxyl-terminated vinyl castor oil. Add 50 g of isophorone diisocyanate, 12 g of 2,2-dimethylolpropionic acid, and 120 g of polyester diol (Covestro, Desmophen, molecular weight 2000) into 200 ml of methyl ethyl ketone, stir and heat up to 70 °C and react for 10 h. Then add 5 g of hydroxypropyl methacrylate, stir and react for 1 h to terminate the polymerization reaction of the polyurethane. Then add 8 g of N,N-dimethylethanolamine to neutralize the carboxyl groups in the polyurethane structure. Then add acrylic monomers composed of 5 g of vinyl-terminated castor oil, 5 g of acrylic acid, 20 g of butyl acrylate, and 30 g of methyl methacrylate. After stirring for 30 min, add 300 ml of deionized water, carry out phase inversion at a shear rate of 2000 r / min. After 10 min, reduce the shear rate to 60 r / min, add 1 g of free radical initiator AIBN, continue to stir and react for 5 h, and then distill off methyl ethyl ketone under reduced pressure.

[0046] The preparation method of the photoinitiating waterborne alkyd resin is as follows:

[0047] Stir and heat 43.5 g of 2,4-toluene diisocyanate to 65 °C, then add 0.05 g of dibutyltin dilaurate. Subsequently, dropwise add the solution obtained by dissolving 49.5 g of 4-hydroxybenzophenone in 300 ml of ethyl acetate. After dropping, keep the temperature and react for 10 h, then appropriately concentrate under reduced pressure. Add 500 ml of ether to precipitate the product, filter and collect the product, and dry it in vacuum at 65 °C to obtain the intermediate. Under nitrogen protection, add 20 g of the intermediate, 42.3 g of linoleic acid, 24.3 g of trimethylolpropane, 24.7 g of phthalic anhydride, and 500 ml of xylene into a reaction kettle equipped with a water separator and a condenser. Heat up to 200 °C and keep the temperature and react for 4 h. During this period, separate the water generated by the reaction and reflux the xylene back into the reaction kettle. After the reaction, distill off xylene under reduced pressure. Cool down to 160 °C, add 8.7 g of trimellitic anhydride, then heat up to 180 °C and keep the temperature and react for 2 h. Then cool down to 100 °C, add 41.6 g of ethylene glycol monobutyl ether, disperse at high speed for 0.5 h, and then restore to room temperature.

[0048] The preparation method of the amino-functionalized nano-titanium dioxide is as follows:

[0049] Add 20 ml of ethylenediamine to 300 ml of deionized water. While stirring, add 40 g of lysine and 30 g of tetrabutyl titanate. Adjust the pH of the reaction solution to 10 with 1 mol / L sodium hydroxide solution, and then continue stirring for 0.5 h. Subsequently, transfer it into a hydrothermal reaction kettle, seal it, heat it up to 120 °C, and react for 15 h. After the reaction is completed, cool it naturally to room temperature, filter to collect the product, wash it with absolute ethanol and deionized water, and then dry it under vacuum.

[0050] The preparation method of the above-mentioned positioning environmentally friendly laser transfer film is as follows:

[0051] Mix and stir an aqueous polyurethane acrylate resin emulsion, a photoinitiator aqueous alkyd resin, dipentaerythritol hexaacrylate, a polyether-modified polysiloxane surfactant, amino-functionalized nano-titanium dioxide, an antifoaming agent BYK-024, a leveling agent BYK-346, and an adhesion promoter BYK-4500 for 10 min to obtain a laser transfer coating. Take the laser transfer coating and coat it on the BOPP base film layer 1 with a high-speed coater. Subsequently, dry it at 30 °C for 1 h, and then cure it under ultraviolet light for 300 s to obtain a laser information layer 2 with a thickness of about 5 μm. Heat the stamper to 180 °C, and hot-stamp the laser information on the stamper onto the laser information layer 2 at a high temperature to form a laser dazzling effect. Under a high vacuum condition of 0.04 Pa, a vacuum aluminizing machine heats the aluminum wire to vaporization and forms an aluminized layer 3 with a thickness of about 50 nm on the laser information layer 2 by vacuum aluminizing.

[0052] Example 2:

[0053] A positioning environmentally friendly laser transfer film is composed of a BOPP base film layer 1, a laser information layer 2, and an aluminized layer 3;

[0054] The laser information layer 2 is made from the following raw materials in parts by weight:

[0055] 70 parts of an aqueous polyurethane acrylate resin emulsion, 15 parts of a photoinitiator aqueous alkyd resin, 12 parts of dipentaerythritol hexaacrylate, 1 part of a polyether-modified polysiloxane surfactant, 5 parts of amino-functionalized nano-titanium dioxide, 0.5 part of an antifoaming agent BYK-024, 1 part of a leveling agent BYK-346, and 1 part of an adhesion promoter BYK-4500.

[0056] Among them, the preparation methods of the aqueous polyurethane acrylate resin emulsion, the photoinitiator aqueous alkyd resin, and the amino-functionalized nano-titanium dioxide are the same as those in Example 1.

[0057] The preparation method of the above-mentioned positioning environmentally friendly laser transfer film is as follows:

[0058] The aqueous polyurethane acrylate resin emulsion, photoinitiator aqueous alkyd resin, dipentaerythritol hexaacrylate, polyether-modified polysiloxane surfactant, aminated nano-titanium dioxide, defoamer BYK-024, leveling agent BYK-346, and adhesion promoter BYK-4500 were mixed and stirred for 10 min to obtain a laser transfer coating. The laser transfer coating was taken and coated on the BOPP base film layer 1 with a high-speed coater. Subsequently, it was dried at 30 °C for 1 h and then cured under ultraviolet light for 300 s to obtain a laser information layer 2 with a thickness of about 5 μm. The embossing plate was heated to 180 °C, and the laser information on the embossing plate was hot-stamped onto the laser information layer 2 in a high-temperature state to form a laser colorful effect. Under the high-vacuum condition of 0.04 Pa, the aluminum wire was heated to vaporization by a vacuum aluminizing machine, and an aluminized layer 3 with a thickness of about 50 nm was formed on the laser information layer 2 by vacuum aluminizing.

[0059] Example 3:

[0060] A positioning environmentally friendly laser transfer film is composed of a BOPP base film layer 1, a laser information layer 2, and an aluminized layer 3;

[0061] The laser information layer 2 is made of the following raw materials in parts by weight:

[0062] 60 parts of aqueous polyurethane acrylate resin emulsion, 10 parts of photoinitiator aqueous alkyd resin, 8 parts of dipentaerythritol hexaacrylate, 0.1 part of polyether-modified polysiloxane surfactant, 1 part of aminated nano-titanium dioxide, 0.5 part of defoamer BYK-024, 1 part of leveling agent BYK-346, and 1 part of adhesion promoter BYK-4500.

[0063] Among them, the preparation methods of the aqueous polyurethane acrylate resin emulsion, photoinitiator aqueous alkyd resin, and aminated nano-titanium dioxide are the same as those in Example 1.

[0064] The preparation method of the above positioning environmentally friendly laser transfer film is as follows:

[0065] Mix the aqueous polyurethane acrylate resin emulsion, photoinitiator aqueous alkyd resin, dipentaerythritol hexaacrylate, polyether-modified polysiloxane surfactant, aminated nano-titanium dioxide, defoamer BYK-024, leveling agent BYK-346, and adhesion promoter BYK-4500 and stir for 10 min to obtain the laser transfer coating. Take the laser transfer coating and coat it on the BOPP base film layer 1 with a high-speed coater. Then dry it at 30 °C for 1 h, and then cure it under ultraviolet light for 300 s to obtain a laser information layer 2 with a thickness of about 5 μm. Heat the stamper to 180 °C, and hot stamp the laser information on the stamper onto the laser information layer 2 at a high temperature to form a laser dazzling effect. Under the high vacuum condition of 0.04 Pa, the vacuum aluminizing machine heats the aluminum wire to vaporization and forms an aluminized layer 3 with a thickness of about 50 nm on the laser information layer 2 by vacuum aluminizing.

[0066] Comparative Example 1: It is basically the same as Example 1, except that a commercially available aqueous acrylate resin emulsion (Young Sun ® AC 6038) is used instead of the aqueous polyurethane acrylate resin emulsion.

[0067] Comparative Example 2: It is basically the same as Example 1, except that the photoinitiator aqueous alkyd resin is not added, and 1% of photoinitiator 1173 based on the mass of the aqueous polyurethane acrylate resin emulsion is added.

[0068] Comparative Example 3: It is basically the same as Example 1, except that dipentaerythritol hexaacrylate is not added.

[0069] Comparative Example 4: It is basically the same as Example 1, except that the polyether-modified polysiloxane surfactant is not added.

[0070] Comparative Example 5: It is basically the same as Example 1, except that commercially available nano-titanium dioxide (HOMBITEC RM200) is used instead of aminated nano-titanium dioxide.

[0071] Performance test:

[0072] Uniformly coat the laser transfer coatings in Examples 1-3 and Comparative Examples 1-5 of the present invention on the BOPP film with the same thickness. After drying at 30 °C for 1 h, then cure it under ultraviolet light for 300 s to obtain specimens, and conduct performance tests on them.

[0073] Use the PPH-750 pencil hardness tester of Shanghai Tianchen Modern Environmental Technology Co., Ltd. to measure the pencil hardness of the coating according to GB / T6739-2006;

[0074] Use the HGQ type paint film cross cutter of Shanghai Pushen Chemical Machinery Co., Ltd. to measure the adhesion of the coating according to GB / T9268-1998;

[0075] The impact resistance of the coating was determined in accordance with GB / T 1732-1993 using the BGD304 film impact tester from Guangzhou Biaogeda Precision Instrument Co., Ltd.;

[0076] Set the oven temperature to 100 °C. After the temperature is constant, place the specimen in the oven, quickly close the door and start timing for 2 minutes. Take out the specimen and check its appearance. If there is no blueing or whitening phenomenon, it is judged as qualified. Repeat the above steps until the temperature at which the specimen changes is the high-temperature resistance performance, and the high-temperature resistance performance of the specimen is characterized by the number of times it is placed in the oven.

[0077] The test results are shown in Table 1 below:

[0078]

[0079] As can be seen from Table 1 above, the laser information layer in the positioning environmentally friendly laser transfer film prepared by the present invention has excellent mechanical strength and high-temperature resistance performance;

[0080] From the comparison between Example 1 and Comparative Example 1, it can be seen that the addition of the aqueous polyurethane acrylate resin emulsion significantly improves the mechanical strength and high-temperature resistance performance of the laser information layer;

[0081] From the comparison between Example 1 and Comparative Example 2, it can be seen that the addition of the photoinitiating waterborne alkyd resin significantly improves the mechanical strength and high-temperature resistance performance of the laser information layer;

[0082] From the comparison between Example 1 and Comparative Example 3, it can be seen that the addition of dipentaerythritol hexaacrylate significantly improves the mechanical strength and high-temperature resistance performance of the laser information layer;

[0083] From the comparison between Example 1 and Comparative Example 4, it can be seen that the addition of the polyether-modified polysiloxane surfactant significantly improves the mechanical strength and high-temperature resistance performance of the laser information layer;

[0084] From the comparison between Example 1 and Comparative Example 5, it can be seen that compared with the commercially available nano-titanium dioxide, the addition of the amino-functionalized nano-titanium dioxide in the present invention has a greater improvement in the mechanical strength and high-temperature resistance performance of the laser information layer.

[0085] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A positioning environmentally friendly laser transfer film, characterized in that: It is composed of a base film layer, a laser information layer and an aluminum plating layer; The laser information layer is made of the following raw materials in parts by weight: 60-70 parts of waterborne polyurethane acrylic resin emulsion, 10-15 parts of photoinitiated waterborne alkyd resin, 8-12 parts of dipentaerythritol hexaacrylate, 0.1-1 parts of polyether modified polysiloxane surfactant, 1-5 parts of amino-modified nano titanium dioxide, and 1-3 parts of functional additives; The preparation method of the photoinitiated waterborne alkyd resin is as follows: Stir 2,4-toluene diisocyanate and heat it to 60-70°C, then add an organic tin catalyst, then add a solution obtained by dissolving 4-hydroxybenzophenone in ethyl acetate, keep the temperature for reaction for 5-10 hours, then concentrate under reduced pressure, precipitate the product with ether, collect the product by filtration, and dry under vacuum to obtain an intermediate. Under nitrogen protection, add the intermediate, linoleic acid, trimethylolpropane, and phthalic anhydride to xylene, stir and heat it to 200-210°C, keep the temperature for reaction for 1-5 hours, then remove xylene by distillation under reduced pressure, cool it to 150-160°C, add trimellitic anhydride, then heat it to 180-190°C and keep the temperature for reaction for 1-5 hours, then cool it to 100-110°C, add ethylene glycol monobutyl ether, disperse it at high speed for 0.5-1 hour, and then return to room temperature; The preparation method of the aqueous polyurethane acrylic resin emulsion is as follows: Add diisocyanate, 2,2-dimethylolpropionic acid and polyester diol to butanone, stir and heat to 70-80°C for reaction for 1-10h, then add hydroxypropyl methacrylate, N,N-dimethylethanolamine, acrylic acid monomer and deionized water in sequence, stir well to mix evenly, add free radical initiator, continue stirring and react for 1-10h, and then remove butanone by vacuum distillation; The acrylic acid monomer consists of vinyl-terminated castor oil, acrylic acid, butyl acrylate and methyl methacrylate in a mass ratio of 1-10:1-10:1-10:1-10.

2. The positioning environmentally friendly laser transfer film according to claim 1, characterized in that: The vinyl-terminated castor oil is obtained by esterification reaction of maleic anhydride and castor oil.

3. The positioning environmentally friendly laser transfer film according to claim 1, characterized in that: The preparation method of amination nano titanium dioxide is as follows: Add ethylenediamine to deionized water, add lysine and tetrabutyl titanate under stirring, adjust the pH of the reaction solution to 10-11 and continue stirring for 0.5-1h, then transfer to a hydrothermal reactor, seal and heat to 100-120°C to react for 10-20h, cool naturally to room temperature, filter and collect the product, wash and dry.

4. The positioning environmentally friendly laser transfer film according to claim 3, characterized in that: The mass ratio of lysine to tetrabutyl titanate is 1-5:1-5.

5. The positioning environmentally friendly laser transfer film according to claim 1, characterized in that: The functional additives include defoamers, leveling agents and adhesion promoters.

6. The positioning environmentally friendly laser transfer film according to claim 5, characterized in that: The mass ratio of the defoamer, the leveling agent and the adhesion promoter is 1-5:1-5:1-5.

7. The positioning environmentally friendly laser transfer film according to claim 1, characterized in that: The base film layer is at least one of a BOPP film, a PET film, a PVC film, a PLA film, and a PBAT film.

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