Electroplated metal laser full wrap film with surface texture

Abstract

This application relates to the field of full transfer film technology, specifically disclosing an electroplated metal laser full transfer film with surface texture. The electroplated metal laser full transfer film with surface texture includes a substrate, a release layer, a laser molding layer, an aluminum plating layer, and an adhesive layer. The laser molding layer coating is prepared from acrylic resin, alkyd resin, isocyanate curing agent, hexamethylolmelamine, hydroxyl acrylate, modified filler, leveling agent, defoamer, pigment, and solvent. The modified filler is prepared from nano-alumina, polyethyleneimine, and fumaric acid, with a mass ratio of nano-alumina, polyethyleneimine, and fumaric acid of 1:(0.4-0.6):(0.7-1). This invention effectively improves the surface adhesion of the laser molding layer, reduces the separation of the laser molding layer during hot stamping, and improves the quality of the full transfer film.

Description

Technical Field

[0001] This invention relates to the field of full transfer film technology, and more particularly to electroplated metal laser full transfer film with surface texture. Background Technology

[0002] Electroplated metal laser holographic transfer film is a packaging material made using laser holographic technology as its core, through processes such as lamination, coating, molding, and aluminizing. Its characteristics include forming holographic patterns through laser interference, resulting in a strong metallic texture, oxidation resistance, and moisture resistance. It is widely used in the packaging of tobacco, alcohol, pharmaceuticals, cosmetics, and other products, achieving decorative and anti-counterfeiting functions.

[0003] Electroplated metal laser transfer film consists of a base film, a release layer, a coloring layer, an aluminum plating layer, and an adhesive layer. The base film, acting as a carrier, is typically made of a material transparent to laser energy wavelengths. The release layer serves as a release liner in the transfer film structure. The coloring layer gives the transfer film different colors, and laser patterns are molded onto the coloring layer using molding equipment, providing a decorative effect. The aluminum plating layer adheres to the coloring layer, enhancing the metallic luster. The adhesive layer is used to bond the transfer film to the substrate.

[0004] In electroplated metal laser transfer molding structures, the coloring layer is located between the release layer and the aluminum plating layer. Due to the weak adhesion between the existing coloring layer and the release layer, under the high temperature and pressure of the molding equipment, the coloring layer may locally slide or shift, causing the molded laser pattern to deform, become blurred, or become unclear. It can even lead to separation between the coloring layer and the release layer during the hot stamping process. Simultaneously, insufficient adhesion between the coloring layer and the aluminum plating layer on the other side can also cause separation between the coloring layer and the aluminum plating layer, severely affecting the laser effect of the transfer molding. Summary of the Invention

[0005] In order to increase the surface adhesion of the coloring layer and improve the bonding force between the coloring layer and the release layer, and between the coloring layer and the aluminum plating layer, this application provides an electroplated metal laser full transfer film with surface texture.

[0006] In the first aspect, the electroplated metal laser full transfer film with surface texture provided in this application adopts the following technical solution: the electroplated metal laser full transfer film with surface texture includes a substrate, a release layer, a laser molding layer, an aluminum plating layer and an adhesive layer.

[0007] The laser-molded layer is prepared from the following raw materials in parts by weight:

[0008] 40-50 parts acrylic resin, 10-15 parts alkyd resin, 6-10 parts isocyanate curing agent, 1-3 parts hexamethylol melamine, 3-7 parts hydroxy acrylate, 9-13 parts modified filler, 0.3-0.5 parts leveling agent, 0.2-0.5 parts defoamer, 0-5 parts pigment, and 45-50 parts solvent;

[0009] The raw materials for preparing the modified filler include nano-alumina, polyethyleneimine, and fumaric acid, and the mass ratio of nano-alumina, polyethyleneimine, and fumaric acid is 1:(0.4-0.6):(0.7-1).

[0010] By adopting the above technical solution, this application uses acrylic resin, alkyd resin, hydroxyl acrylate, and isocyanate curing agent as the film-forming substances for the laser molding layer coating. The isocyanate curing agent and hexamethylol melamine have a synergistic effect. The two crosslink with the alkyd resin through esterification reaction, promoting the formation of crosslinked network structure, improving the density of the coating, and the resulting laser molding layer has a fast drying speed and good adhesion to the substrate and aluminum plating layer, providing excellent construction performance for subsequent molding and heat transfer, so that the full transfer film has a good laser effect.

[0011] The addition of modified fillers plays a role in toughening and reinforcement. Specifically, the amino groups in polyethyleneimine and the carboxyl groups in fumaric acid combine with the hydroxyl groups on the surface of nano-alumina, introducing amino and carboxyl groups into the surface of nano-alumina and dispersing the nano-alumina in the resin matrix. In addition, the amino groups in polyethyleneimine combine with isocyanate groups, which stably disperses the nano-alumina between polymer molecular chains, reducing particle aggregation and collapse, improving the density and uniformity of the coating, and reducing the deformation and cracking of the laser pattern in the laser-molded layer during subsequent molding.

[0012] Preferably, the method for preparing the modified filler includes the following steps:

[0013] Polyethyleneimine was dispersed in a solvent and stirred until homogeneous to obtain a polyethyleneimine solution. Fumaric acid was dissolved in water and stirred until homogeneous to obtain a fumaric acid solution. Nano-alumina was added to the fumaric acid solution and stirred to react, resulting in a dispersion. Polyethyleneimine solution was then added and stirred to react. After the reaction was completed, the mixture was filtered, washed, and dried to obtain the modified filler.

[0014] By employing the above technical solution, nano-alumina is first reacted with a fumaric acid solution through stirring, allowing fumaric acid molecules to adhere to the surface of the nano-alumina. The carboxyl groups of fumaric acid can react with the hydroxyl groups on the surface of the nano-alumina, increasing the number of active groups on the surface of the nano-alumina. Then, a polyethyleneimine solution is added for further reaction. Polyethyleneimine contains a large number of amino groups, which can further react with the carboxyl groups on the fumaric acid to form stable chemical bonds, thus completing the modification of the nano-alumina. The modified nano-alumina can improve the density and uniformity of the laser molding layer coating. In subsequent molding processes, it can reduce the deformation and cracking of the laser pattern, avoiding the impact of laser pattern deformation, blurring, or unclearness on the laser effect of the full transfer film.

[0015] Preferably, the isocyanate curing agent includes one or both of HDI trimer and IPDI trimer.

[0016] By adopting the above technical solution, both HDI trimer and IPDI trimer contain triazine rings, which have a synergistic effect with the triazine rings in hexamethylolmelamine, significantly improving the anti-aging and heat resistance properties of the coating film. The triazine ring structure possesses good chemical and thermal stability; the synergistic effect of the two enhances the cross-linking density between molecules, forming a more stable network structure that effectively resists the erosion of the coating film by external environmental factors such as ultraviolet radiation, oxygen, and temperature changes, slowing down the aging rate of the coating film and extending its service life. Simultaneously, the synergistic effect also improves the stability of the laser-molded layer in high-temperature environments, enabling it to withstand higher temperatures without deformation or decomposition, ensuring the stability of the laser-molded layer during molding and transfer processes, and improving the quality and performance of the full transfer film.

[0017] Preferably, the alkyd resin has an oil content of 50%-55%.

[0018] By adopting the above technical solution, the combination of alkyd resin with an oil content of 50%-55% and acrylic resin can improve the polarity of the coating film, enhance the bonding force between the laser molding layer and the release layer and the aluminum plating layer, reduce the separation between layers, and improve the heat transfer effect of the full transfer film.

[0019] Preferably, the hydroxy acrylate includes one or both of neopentyl glycol diacrylate and pentaerythritol triacrylate.

[0020] Preferably, the hydroxy acrylate comprises neopentyl glycol diacrylate and pentaerythritol triacrylate in a mass ratio of 1:(0.1-0.3).

[0021] By adopting the above technical solution, the presence of hydroxyl groups in the hydroxyl ester of acrylic acid can improve the polarity of acrylic resin and enhance the interaction force between the laser molding layer and the surface of the film material. This improves the adhesion between the laser molding layer and the release layer and the aluminum plating layer, avoiding the problem of local sliding, displacement or separation of the laser molding layer under the high temperature and high pressure of the molding equipment. At the same time, it ensures that the laser pattern of the molding is clear and complete, and improves the laser effect and quality of the electroplated metal laser full transfer film with surface texture.

[0022] Preferably, the defoamer is an organic ester defoamer.

[0023] More preferably, the organic ester defoamer includes one or more of Haimingsideqian Defom W-074, Haimingsideqian DF-7540 defoamer, and Haimingsideqian DF-7580 defoamer.

[0024] By adopting the above technical solution, organic ester defoamers have good compatibility with coating systems and good dispersibility, which promotes solid film rupture, puts foam in an unstable state, facilitates defoaming, and forms a smooth and flat coating film.

[0025] Preferably, the leveling agent is an organosilicon leveling agent.

[0026] More preferably, the silicone leveling agent includes one or more of BYK-306, BYK-333, and BYK-370.

[0027] By adopting the above technical solution, the above-mentioned silicone leveling agent can improve the flatness and uniformity of the laser molding layer, avoid surface defects caused by poor leveling, and ensure the clarity and integrity of the laser pattern.

[0028] Preferably, the solvent comprises acetone and diacetone alcohol in a mass ratio of 1:(0.3-0.5).

[0029] Preferably, the method for preparing the laser-embossed coating is as follows:

[0030] Acrylic resin, alkyd resin, isocyanate curing agent, hexamethylol melamine, hydroxy acrylate, and solvent are added to a mixing tank and stirred to react. Modified filler and pigment are then added and stirred to react. Leveling agent and defoamer are then added and stirred to react, resulting in a laser molding layer coating with a predetermined solid content.

[0031] Preferably, the solid content of the laser-molded coating is 40%-45%.

[0032] Secondly, the method for preparing electroplated metal laser full transfer film with surface texture provided in this application adopts the following technical solution:

[0033] A method for preparing an electroplated metal laser transfer film with surface texture includes the following steps:

[0034] A surface texture is created on a substrate using UV curing texturing technology. A release layer is then applied to the film surface with the UV-cured texture. After the release layer cures, a laser molding layer coating is applied. After curing, a molding coating is obtained. Then, a nickel plate molding process is used to emboss the molding coating to obtain a laser molding layer. Vacuum aluminum plating is performed on the laser molding layer to obtain an aluminum plating layer. Finally, an adhesive layer is applied to the aluminum plating layer to obtain an electroplated metal laser full transfer film with surface texture.

[0035] Preferably, the substrate is a PET substrate.

[0036] Preferably, the nickel plate molding process is as follows: the starting temperature is 130-140℃, which is gradually increased to 165-185℃, and the machine speed is gradually increased from 4-6m / min to 47-53m / min.

[0037] By adopting the above technical solution, the full transfer film prepared by the above method has clear surface texture and laser effect, which enhances the visual effect and artistic sense of the product. It has a strong metallic texture, anti-oxidation and moisture-proof properties, and can realize functions such as decoration and anti-counterfeiting.

[0038] This application has the following beneficial effects:

[0039] This application uses acrylic resin, alkyd resin, hydroxyl acrylate, and isocyanate curing agent as the film-forming substances for the laser molding layer coating. The isocyanate curing agent and hexamethylol melamine have a synergistic effect. The two crosslink with the alkyd resin through esterification reaction, promoting the formation of crosslinked network structure and improving the density of the coating. The resulting laser molding layer has a fast drying speed and good adhesion to the substrate and aluminum plating layer, providing excellent construction performance for subsequent molding and heat transfer, and enabling the full transfer film to have a good laser effect.

[0040] The addition of modified fillers plays a role in toughening and reinforcement. Specifically, the amino groups in polyethyleneimine and the carboxyl groups in fumaric acid combine with the hydroxyl groups on the surface of nano-alumina, introducing amino and carboxyl groups into the surface of nano-alumina and dispersing the nano-alumina in the resin matrix. In addition, the amino groups in polyethyleneimine combine with isocyanate groups, which stably disperses the nano-alumina between polymer molecular chains, reducing particle aggregation and collapse, improving the density and uniformity of the coating, and reducing the deformation and cracking of the laser pattern in the laser-molded layer during subsequent molding. Detailed Implementation

[0041] Preparation Example

[0042] Preparation Example 1

[0043] Preparation of modified fillers:

[0044] 36g of polyethyleneimine was dispersed in 180mL of water and stirred until homogeneous to obtain a polyethyleneimine solution. 63g of fumaric acid was dissolved in 180mL of ethanol and stirred until homogeneous to obtain a fumaric acid solution. 90g of nano-alumina was added to the fumaric acid solution and ultrasonically dispersed for 25min to obtain a dispersion. Then, polyethyleneimine solution was added and ultrasonically dispersed for 25min. After the reaction was completed, the mixture was filtered, washed, and dried to obtain the modified filler.

[0045] Preparation Example 2

[0046] Preparation of modified fillers:

[0047] 55g of polyethyleneimine was dispersed in 225mL of water and stirred until homogeneous to obtain a polyethyleneimine solution. 88g of fumaric acid was dissolved in 225mL of ethanol and stirred until homogeneous to obtain a fumaric acid solution. 110g of nano-alumina was added to the fumaric acid solution and ultrasonically dispersed for 30min to obtain a dispersion. Then, polyethyleneimine solution was added and ultrasonically dispersed for 30min. After the reaction was completed, the mixture was filtered, washed, and dried to obtain the modified filler.

[0048] Preparation Example 3

[0049] Preparation of modified fillers:

[0050] 78g of polyethyleneimine was dispersed in 400mL of water and stirred until homogeneous to obtain a polyethyleneimine solution. 130g of fumaric acid was dissolved in 400mL of ethanol and stirred until homogeneous to obtain a fumaric acid solution. 130g of nano-alumina was added to the fumaric acid solution and ultrasonically dispersed for 35min to obtain a dispersion. Then, polyethyleneimine solution was added and ultrasonically dispersed for 35min. After the reaction was completed, the mixture was filtered, washed, and dried to obtain the modified filler.

[0051] Preparation Example 4

[0052] The difference between this preparation example and preparation example 2 is that the same mass of polyethyleneimine is replaced with fumaric acid.

[0053] Preparation Example 5

[0054] The difference between this preparation example and Preparation Example 2 is that fumaric acid is replaced by polyethyleneimine by mass.

[0055] Example

[0056] Example 1

[0057] Electroplated metal laser transfer film with surface texture, including substrate, release layer, laser molding layer, aluminum plating layer and adhesive layer.

[0058] The raw materials for preparing the laser-molded layer include:

[0059] 400g acrylic resin, 100g alkyd resin, 60g HDI trimer, 10g hexamethylol melamine, 27g neopentyl glycol diacrylate hydroxypentanoic acid, 3g pentaerythritol triacrylate, 90g modified filler, 3g silicone leveling agent, 2g organic ester defoamer, 10g pigment, 346g acetone, 104g diacetone alcohol.

[0060] Among them, the acrylic resin is KN3915P from Foshan Shunde Sansheng Trading Co., Ltd.;

[0061] The alkyd resin is 389-9B alkyd resin from Shandong Lingsai Coatings Co., Ltd., with an oil content of 55%.

[0062] The HDI trimer is HT-100 from Hubei Langbowan Biomedical Co., Ltd.

[0063] The modified filler was the modified filler prepared in Preparation Example 1;

[0064] The silicone leveling agent is BYK-306;

[0065] The organic ester defoamer is Haimingsideqian DF-7540 defoamer.

[0066] The preparation method of the laser-embossed coating is as follows:

[0067] Acrylic resin, alkyd resin, HDI trimer, hexamethylol melamine, neopentyl glycol diacrylate, pentaerythritol triacrylate, acetone, and diacetone alcohol were added to a stirred tank and stirred at 70°C for 30 minutes. Then, modified fillers and pigments were added, and the mixture was stirred for another 30 minutes. Finally, silicone leveling agent and organic ester defoamer were added, and the mixture was stirred for 20 minutes to obtain a laser molding coating with a solid content of 40%.

[0068] The method for preparing an electroplated metal laser full transfer film with surface texture includes the following steps:

[0069] A UV-cured textured surface is created on a PET substrate. A release layer is then applied to the UV-cured textured film. After the release layer cures, a laser molding coating is applied. Once cured, a molding coating is obtained. Then, a nickel plate molding process is used to emboss the molding coating. The initial temperature is 130℃, which is gradually increased to 165℃, and the machine speed is gradually increased from 4m / min to 47m / min to obtain a laser molding layer. Vacuum aluminizing is then performed on the laser molding layer to obtain an aluminum plating layer. Finally, an adhesive layer is applied to the aluminum plating layer, and after curing, an electroplated metal laser full transfer film with surface texture is obtained.

[0070] The UV curing texturing technology includes the following steps:

[0071] By selecting a suitable mold and creating textures through chemical etching of a metal plate, an etching mold is obtained.

[0072] The PET substrate is cleaned, and UV adhesive is applied to the surface of the PET substrate by roller coating or drop application. Then, the PET substrate coated with UV adhesive is placed on the mold, and pressure is applied to make the UV adhesive fill the mold texture.

[0073] UV light is used to irradiate the PET adhesive to cure it quickly, and then the PET substrate is peeled off from the mold to form a texture on the PET substrate.

[0074] Example 2

[0075] Electroplated metal laser transfer film with surface texture, including substrate, release layer, laser molding layer, aluminum plating layer and adhesive layer.

[0076] The raw materials for preparing the laser-molded layer include:

[0077] 500g acrylic resin, 150g alkyd resin, 100g HDI trimer, 30g hexamethylol melamine, 54g neopentyl glycol diacrylate, 16g pentaerythritol triacrylate, 130g modified filler, 5g silicone leveling agent, 5g organic ester defoamer, 50g pigment, 333g acetone, 167g diacetone alcohol.

[0078] Among them, the acrylic resin is KN3915P from Foshan Shunde Sansheng Trading Co., Ltd.;

[0079] The alkyd resin is 389-9B alkyd resin from Shandong Lingsai Coatings Co., Ltd., with an oil content of 55%.

[0080] The HDI trimer is HT-100 from Hubei Langbowan Biomedical Co., Ltd.

[0081] The modified filler was the modified filler prepared in Preparation Example 2;

[0082] The silicone leveling agent is BYK-333;

[0083] The organic ester defoamer is Haiming Sideqian DF-7580 defoamer.

[0084] The preparation method of the laser-embossed coating is as follows:

[0085] Acrylic resin, alkyd resin, HDI trimer, hexamethylol melamine, neopentyl glycol diacrylate, pentaerythritol triacrylate, acetone, and diacetone alcohol were added to a stirred tank and stirred at 75°C for 40 minutes. Then, modified fillers and pigments were added, and the mixture was stirred for another 40 minutes. Finally, silicone leveling agent and organic ester defoamer were added, and the mixture was stirred for 25 minutes to obtain a laser molding layer coating with a solid content of 43%.

[0086] The method for preparing an electroplated metal laser full transfer film with surface texture includes the following steps:

[0087] A UV-cured textured surface is created on a PET substrate. A release layer is then applied to the UV-cured textured film. After the release layer cures, a laser molding coating is applied. After curing, a molding coating is obtained. Then, a nickel plate molding process is used to emboss the molding coating. The starting temperature is 140℃, which is gradually increased to 175℃, and the machine speed is gradually increased from 5m / min to 50m / min to obtain a laser molding layer. Vacuum aluminizing is then performed on the laser molding layer to obtain an aluminum plating layer. Finally, an adhesive layer is applied to the aluminum plating layer, and after curing, an electroplated metal laser full transfer film with surface texture is obtained.

[0088] The UV curing texturing technology includes the following steps:

[0089] By selecting a suitable mold and creating textures through chemical etching of a metal plate, an etching mold is obtained.

[0090] The PET substrate is cleaned, and UV adhesive is applied to the surface of the PET substrate by roller coating or drop application. Then, the PET substrate coated with UV adhesive is placed on the mold, and pressure is applied to make the UV adhesive fill the mold texture.

[0091] UV light is used to irradiate the PET adhesive to cure it quickly, and then the PET substrate is peeled off from the mold to form a texture on the PET substrate.

[0092] Example 3

[0093] Electroplated metal laser transfer film with surface texture, including substrate, release layer, laser molding layer, aluminum plating layer and adhesive layer.

[0094] The raw materials for preparing the laser-molded layer include:

[0095] 450g acrylic resin, 125g alkyd resin, 80g HDI trimer, 20g hexamethylol melamine, 42g neopentyl glycol diacrylate hydroxypentanoic acid, 8g pentaerythritol triacrylate, 110g modified filler, 4g silicone leveling agent, 4g organic ester defoamer, 25g pigment, 335g acetone, 135g diacetone alcohol.

[0096] Among them, the acrylic resin is KN3915P from Foshan Shunde Sansheng Trading Co., Ltd.;

[0097] The alkyd resin is 389-9B alkyd resin from Shandong Lingsai Coatings Co., Ltd., with an oil content of 55%.

[0098] The HDI trimer is HT-100 from Hubei Langbowan Biomedical Co., Ltd.

[0099] The modified filler was the modified filler prepared in Preparation Example 3;

[0100] The silicone leveling agent is BYK-370;

[0101] The organic ester defoamer is Hemings Deqian Defom W-074.

[0102] The preparation method of the laser-embossed coating is as follows:

[0103] Acrylic resin, alkyd resin, HDI trimer, hexamethylol melamine, neopentyl glycol diacrylate, pentaerythritol triacrylate, acetone, and diacetone alcohol were added to a stirred tank and stirred at 80°C for 50 minutes. Then, modified fillers and pigments were added, and the mixture was stirred for another 50 minutes. Finally, silicone leveling agent and organic ester defoamer were added, and the mixture was stirred for 30 minutes to obtain a laser molding layer coating with a solid content of 45%.

[0104] The method for preparing an electroplated metal laser full transfer film with surface texture includes the following steps:

[0105] A UV-cured textured surface is created on a PET substrate. A release layer is then applied to the UV-cured textured film. After the release layer cures, a laser molding coating is applied. Once cured, a molding coating is obtained. Then, a nickel plate molding process is used to emboss the molding coating. The initial temperature is 135℃, which is gradually increased to 185℃, and the machine speed is gradually increased from 6m / min to 53m / min to obtain a laser molding layer. Vacuum aluminum plating is then performed on the laser molding layer to obtain an aluminum plating layer. Finally, an adhesive layer is applied to the aluminum plating layer, and after curing, an electroplated metal laser full transfer film with surface texture is obtained.

[0106] The UV curing texturing technology includes the following steps:

[0107] By selecting a suitable mold and creating textures through chemical etching of a metal plate, an etching mold is obtained.

[0108] The PET substrate is cleaned, and UV adhesive is applied to the surface of the PET substrate by roller coating or drop application. Then, the PET substrate coated with UV adhesive is placed on the mold, and pressure is applied to make the UV adhesive fill the mold texture.

[0109] UV light is used to irradiate the PET adhesive to cure it quickly, and then the PET substrate is peeled off from the mold to form a texture on the PET substrate.

[0110] Example 4

[0111] The difference between this embodiment and Embodiment 2 is that the HDI trimer is replaced with an IPDI trimer of equal mass.

[0112] Among them, the IPDI trimer is DesmodurZ 4470BA from Hubei Maidehao Biotechnology Co., Ltd.

[0113] Example 5

[0114] The difference between this embodiment and Embodiment 2 is that the HDI trimer is replaced by hexamethylene diisocyanate in equal mass.

[0115] Example 6

[0116] The difference between this embodiment and Embodiment 2 is that the same mass of neopentyl glycol diacrylate hydroxypentanoic acid is replaced with pentaerythritol triacrylate.

[0117] Example 7

[0118] The difference between this embodiment and Embodiment 2 is that pentaerythritol triacrylate is replaced by neopentyl glycol diacrylate of hydroxypentanoic acid.

[0119] Comparative Example

[0120] Comparative Example 1

[0121] The electroplated metal laser transfer film with surface texture differs from Example 2 in that it uses the modified filler prepared in Preparation Example 4.

[0122] Comparative Example 2

[0123] The electroplated metal laser transfer film with surface texture differs from Example 2 in that it uses the modified filler prepared in Preparation Example 5.

[0124] Comparative Example 3

[0125] The difference between the electroplated metal laser full transfer film with surface texture and Example 2 is that the modified filler is replaced with nano-alumina.

[0126] Comparative Example 4

[0127] The electroplated metal laser transfer film with surface texture differs from Example 2 in that no modified filler was added.

[0128] Comparative Example 5

[0129] The difference between the surface textured electroplated metal laser full transfer film and Example 2 is that the mass of hexamethylol melamine is replaced with HDI trimer.

[0130] Comparative Example 6

[0131] The electroplated metal laser transfer film with surface texture differs from Example 2 in that the alkyd resin is replaced with acrylic resin. The acrylic resin used is KN3915P from Foshan Shunde Sansheng Trading Co., Ltd.

[0132] Performance testing

[0133] The electroplated metal laser transfer films with surface textures prepared in the various embodiments and comparative examples were hot-stamped onto the surface of the substrate at 125°C. The substrate was then removed. The substrate was a packaging cardboard. The hot-stamped pattern was set as multiple square patterns with an area of ​​50mm × 50mm. The following tests were then conducted.

[0134] 1. Adhesion test: The laser molding layer coatings prepared in each example and comparative example were applied to PET substrates and aluminum substrates with attached release layers, respectively. The test was carried out in accordance with GB / T 9286-2021 "Paints and Varnishes Cross-cut Test". Special tape was used to stick and quickly peel off, and the coating peeling in the squares was observed to evaluate the adhesion. The adhesion level was divided into 0-5, with 0 being the best and 5 being the worst.

[0135] 2. Laser effect: After separating the laser molding layer, release layer and substrate of the electroplated metal laser full transfer film with surface texture, observe the clarity of the pattern on the unbonded part of the laser molding layer and evaluate it. Level 1 is clear pattern without impurities, Level 2 is clear pattern with slight impurities, Level 3 is slightly blurry pattern, and Level 4 is obviously blurry pattern.

[0136] 3. Hot stamping quality: The prepared electroplated metal laser transfer film with surface texture is hot stamped onto the surface of the substrate at 125℃. The hot stamped pattern is a square pattern with an area of ​​50mm×50mm. The clarity and integrity of the pattern are observed.

[0137] 4. Flexibility test: The laser-molded coatings prepared in each example and comparative example were coated on tinplate and dried at 100℃ for 30 min to form a film with a thickness of 25±1μm. The film was tested according to the method of GB / T 1731-2020 to observe whether there were network patterns, cracks and peeling phenomena. The test results are recorded in Table 1.

[0138] Table 1

[0139]

[0140] Based on the comparison between Example 2 and Example 5 and the data in Table 1, it can be seen that hexamethylene diisocyanate does not contain a triazine ring structure, while HDI trimer contains a triazine ring. Through the synergistic effect with hexamethylol melamine, the heat resistance of the laser molding layer can be significantly improved, so that the laser molding layer can withstand higher temperatures during molding and transfer without deformation or decomposition, thus ensuring the hot stamping and laser effect of the full transfer film.

[0141] Based on the comparison between Examples 2 and 6-7 and the data in Table 1, it can be seen that when neopentyl glycol diacrylate and pentaerythritol triacrylate interact synergistically with acrylic resin, they can improve the polarity of acrylic resin and enhance the interaction force between the laser-molded layer and the surface of the film material. This improves the adhesion between the laser-molded layer and the release layer and the aluminum plating layer, and avoids the problem of local sliding, displacement or separation of the laser-molded layer under the high temperature and high pressure of the molding equipment. At the same time, it ensures that the laser pattern of the molding is clear and complete.

[0142] Based on the comparison between Example 2 and Comparative Examples 1-2, and the data in Table 1, it can be seen that: Comparative Example 1 uses fumaric acid alone to modify nano-alumina, and Comparative Example 2 uses polyethyleneimine alone to modify nano-alumina; both have poor modification effects. This application uses polyethyleneimine and fumaric acid synergistically to modify nano-alumina. The modified nano-alumina can improve the density and uniformity of the laser molding layer coating. In the subsequent molding process, it can reduce the deformation and cracking of the laser pattern, avoiding the impact of laser pattern deformation, blurring, or unclear laser effect on the full transfer film.

[0143] Based on the comparison of Example 2 and Comparative Examples 3-4, and the data in Table 1, it can be seen that in Comparative Example 3, the nano-alumina was added directly to the resin system without modification, which easily led to agglomeration and stress concentration points, making it prone to cracking during the molding process. This application adds modified nano-alumina to the resin system, which improves the density and uniformity of the laser molding layer coating. During subsequent molding, it reduces laser pattern deformation and cracking, avoiding the impact of laser pattern deformation, blurring, or unclear laser effects on the full transfer film's laser effect.

[0144] Based on the comparison between Example 2 and Comparative Example 5, and the data in Table 1, it can be seen that Comparative Example 5 did not add hexamethylol melamine, resulting in insufficient cross-linking degree and insufficient heat resistance of the coating. During the molding process, the laser-molded layer was prone to slippage and displacement due to the high temperature and pressure of the equipment, thus affecting the pattern quality. This application improves the heat resistance of the laser-molded layer by adding hexamethylol melamine and isocyanate curing agent in a synergistic effect, providing excellent construction performance for subsequent molding and heat transfer, and enabling the entire transfer film to have a good laser effect.

[0145] Based on the comparison between Example 2 and Comparative Example 6, and the data in Table 1, it can be seen that: in Comparative Example 6, no alkyd resin was added, resulting in poor adhesion of the laser molding layer. The laser molding layer could not adhere well to the release layer, and the aluminum plating layer could not adhere well to the laser molding layer. This caused the aluminum plating to delaminate during the heat transfer process, resulting in the laser molding not being able to be completely transferred to the substrate, which seriously affected the use of the laser molding.

[0146] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this specific embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A laser-transfer coated metal film with surface texture, characterized in that, Includes substrate, release layer, laser molding layer, aluminum plating layer and adhesive layer; After the release layer is cured, a laser molding layer coating is applied. After curing, a molding coating is obtained. Then, a nickel plate molding process is used to emboss the molding coating to obtain a laser molding layer. The laser-embossed coating is prepared from the following raw materials in parts by weight: 40-50 parts acrylic resin, 10-15 parts alkyd resin, 6-10 parts isocyanate curing agent, 1-3 parts hexamethylol melamine, 3-7 parts hydroxy acrylate, 9-13 parts modified filler, 0.3-0.5 parts leveling agent, 0.2-0.5 parts defoamer, 0-5 parts pigment, and 45-50 parts solvent; The raw materials for preparing the modified filler include nano-alumina, polyethyleneimine, and fumaric acid, and the mass ratio of nano-alumina, polyethyleneimine, and fumaric acid is 1:(0.4-0.6):(0.7-1).

2. The electroplated metal laser transfer film with surface texture as described in claim 1, characterized in that, The method for preparing the modified filler includes the following steps: Polyethyleneimine was dispersed in a solvent and stirred until homogeneous to obtain a polyethyleneimine solution. Fumaric acid was dissolved in water and stirred until homogeneous to obtain a fumaric acid solution. Nano-alumina was added to the fumaric acid solution and stirred to react, resulting in a dispersion. Polyethyleneimine solution was then added and stirred to react. After the reaction was completed, the mixture was filtered, washed, and dried to obtain the modified filler.

3. The electroplated metal laser transfer film with surface texture as described in claim 1, characterized in that, The isocyanate curing agent includes one or both of HDI trimer and IPDI trimer.

4. The electroplated metal laser transfer film with surface texture as described in claim 1, characterized in that, The alkyd resin has an oil content of 50%-55%.

5. The electroplated metal laser transfer film with surface texture as described in claim 1, characterized in that, The hydroxy acrylate includes one or both of neopentyl glycol diacrylate and pentaerythritol triacrylate.

6. The electroplated metal laser transfer film with surface texture as described in claim 5, characterized in that, The hydroxy acrylate comprises neopentyl glycol diacrylate and pentaerythritol triacrylate in a mass ratio of 1:(0.1-0.3).

7. The electroplated metal laser transfer film with surface texture as described in claim 1, characterized in that, The defoamer is an organic ester-based defoamer.

8. The electroplated metal laser transfer film with surface texture as described in claim 1, characterized in that, The leveling agent is an organosilicon leveling agent.

9. The electroplated metal laser transfer film with surface texture as described in claim 1, characterized in that, Acrylic resin, alkyd resin, isocyanate curing agent, hexamethylol melamine, hydroxy acrylate, and solvent are added to a mixing tank and stirred to react. Modified filler and pigment are then added and stirred to react. Leveling agent and defoamer are then added and stirred to react, resulting in a laser molding layer coating with a predetermined solid content.

10. The method for preparing an electroplated metal laser transfer film with surface texture according to any one of claims 1-9, characterized in that, Includes the following steps: A surface texture is created on a substrate using UV curing texturing technology. A release layer is then applied to the film surface with the UV-cured texture. After the release layer cures, a laser molding layer coating is applied. After curing, a molding coating is obtained. Then, a nickel plate molding process is used to emboss the molding coating to obtain a laser molding layer. Vacuum aluminum plating is performed on the laser molding layer to obtain an aluminum plating layer. Finally, an adhesive layer is applied to the aluminum plating layer to obtain an electroplated metal laser full transfer film with surface texture.

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