Metallic luster texture aluminized film and method for manufacturing the same

Abstract

The application discloses a metal luster texture aluminum plating film and a preparation method thereof, and belongs to the field of film plating. The metal luster texture aluminum plating film comprises a base material, one side of the base material is provided with an acrylate coating, and the other side is provided with an aluminum plating layer; the acrylate coating is formed by curing acrylate paint; and the surface of the acrylate coating is subjected to embossing treatment to form a texture. The acrylate paint is prepared from raw materials comprising the following components in parts by weight: 42-51 parts of polyurethane modified acrylate; 30-35 parts of acrylate monomer; and 4-8 parts of photoinitiator. The polyurethane modified acrylate is prepared by reacting a polyurethane prepolymer with hydroxy acrylate, tung oil monohydric alcohol and cinnamic alcohol. The application has the advantage of improving the persistence of the metal texture effect.

Description

Technical Field

[0001] This application relates to the field of coating, and in particular to a metallic textured aluminum coating and its preparation method. Background Technology

[0002] Aluminum-coated film is a common decorative film that can be used for surface decoration of various household appliances such as TV panels, refrigerator doors, and computer panels. It can also be used in packaging materials. In order to make aluminum-coated film more metallic, brushed aluminum-coated film has been developed based on aluminum-coated film to imitate the metallic luster and texture of metal materials, thus improving the visual effect of appearance decoration.

[0003] A common production method for aluminized films with metallic texture is to mechanically draw PET film into fibers using a drawing machine, forming a drawn surface on one side of the PET film. Then, aluminum is fixedly attached to the drawn surface through vacuum aluminizing to obtain an aluminized film with a metallic texture.

[0004] However, the aluminum-coated film mentioned above has poor adhesion because the substrate is wire-drawn, which affects the contact between the aluminum layer and the substrate. After long-term use, the metallic texture is affected and the performance of the metallic texture is reduced. Summary of the Invention

[0005] To improve the durability of metallic texture effects, this application provides a metallic luster textured aluminum-coated film and its preparation method.

[0006] Firstly, the metallic textured aluminum-coated film provided in this application adopts the following technical solution:

[0007] A metallic textured aluminized film includes a substrate, one side of which is provided with an acrylic coating and the other side with an aluminized layer. The acrylic coating is formed by curing acrylic paint, and the surface of the acrylic coating is embossed to form a texture.

[0008] The acrylic coating is prepared from raw materials comprising the following parts by weight:

[0009] 42-51 parts of polyurethane-modified acrylate;

[0010] 30-35 parts of acrylate monomer;

[0011] 4-8 parts of photoinitiator;

[0012] The polyurethane-modified acrylate is produced by reacting a polyurethane prepolymer with hydroxy acrylate, tung oil monohydric alcohol, and cinnamyl alcohol.

[0013] By adopting the above technical solution, textured acrylic coating and aluminum plating layer are respectively applied to both sides of the substrate. The substrate does not need to be mechanically drawn. The aluminum plating layer and the substrate can maintain a stable interface bond, which improves the surface smoothness and adhesion of the aluminum plating layer. Through the metallic properties of the aluminum plating layer and the texture properties of the acrylic coating, the aluminum plating film is given a metallic luster and texture, and the texture is maintained.

[0014] Polyurethane-modified acrylate is used as one of the components of the coating to improve the flexibility of the acrylate coating. Tung oil monohydric alcohol and cinnamyl alcohol are added for further modification. Tung oil monohydric alcohol has long flexible segments and multiple carbon-carbon double bonds, which can form a network polymer structure with good extensibility. The addition of cinnamyl alcohol can make up for the lack of rigidity of the polymer structure, thus making the acrylate coating easy to emboss. After embossing, the texture structure has high stability and maintains the continuity of the metallic texture effect.

[0015] Optionally, the polyurethane prepolymer is prepared by diisocyanate and polyether diol, wherein the mass ratio of diisocyanate to polyether diol, hydroxy acrylate, tung oil monohydric alcohol and cinnamyl alcohol is 1:(0.65~0.85):(0.17~0.27):(0.20~0.35):(0.05~0.1).

[0016] By adopting the above technical solution and controlling the ratio of the above raw materials, especially the ratio of tung oil monohydric alcohol to cinnamyl alcohol, the extensibility and stability of the acrylic coating are balanced, and the adhesion of the acrylic coating to the substrate is improved, thereby further extending the durability of the aluminized film.

[0017] Optionally, the raw materials for preparing the polyurethane-modified acrylate include diisocyanate, polyether diol, hydroxy acrylate, tung oil monohydric alcohol, and cinnamyl alcohol. The raw materials also include di-n-butylamine, which is used to consume and detect the remaining isocyanate.

[0018] Optionally, the acrylate monomer includes one or more of methyl acrylate, ethyl acrylate, propyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, trimethylolpropane triacrylate, and pentaerythritol tetraacrylate.

[0019] By adopting the above technical solution, the addition of acrylate monomers enriches the crosslinking structure of the coating and maintains the structural strength of the coating base.

[0020] Optionally, the acrylate monomers include methyl methacrylate and trimethylolpropane triacrylate, wherein the mass ratio of methyl methacrylate to trimethylolpropane triacrylate is 1:(0.50-0.76).

[0021] By adopting the above technical solution, methyl methacrylate is preferred as a monofunctional acrylate monomer, and trimethylolpropane triacrylate is preferred as a polyfunctional acrylate monomer, which promotes the uniform distribution of the crosslinking structure and further improves the aging resistance of the embossed coating.

[0022] Optionally, the polyether diol includes one or both of polyethylene glycol and polypropylene glycol.

[0023] Optionally, the diisocyanate includes one or both of diphenylmethane diisocyanate and isophorone diisocyanate.

[0024] Optionally, the hydroxyacrylate includes one or more of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate, and hydroxypropyl methacrylate.

[0025] Secondly, the method for preparing a metallic textured aluminum-coated film provided in this application adopts the following technical solution: A method for preparing a metallic textured aluminum-coated film includes the following steps:

[0026] Polyurethane-modified acrylate, acrylate monomer and photoinitiator are mixed and stirred to obtain acrylate coating;

[0027] An acrylic coating is applied to one side of a substrate and cured by UV light to form an acrylic coating.

[0028] The acrylic coating is embossed to create a texture;

[0029] Aluminum is vacuum-deposited on the other side of the substrate to form an aluminum layer, which is then dried and cured to obtain a metallic textured aluminum film. By adopting the above technical solution, an acrylic coating and embossing are first prepared to solve the problem of low stability of the aluminum layer that has just finished evaporation and to avoid the influence of embossing on the stability of the aluminum layer. The UV curing method helps to quickly obtain an acrylic coating with good stability.

[0030] Optionally, the substrate may undergo plasma surface treatment before vacuum evaporation of aluminum.

[0031] By adopting the above technical solution, plasma surface treatment activates the substrate surface, generates more active groups, promotes the interfacial bonding between the aluminum plating layer and the substrate, and thus improves the adhesion of the aluminum plating layer.

[0032] Optionally, the preparation method of the polyurethane-modified acrylate includes the following steps:

[0033] Under the protection of an inert gas, polyether diol is heated to 80-90°C, diisocyanate is added and reacted for 1-1.5 hours, then the temperature is lowered to 70-80°C, hydroxy acrylate and tung oil monohydric alcohol are added and reacted for 0.3-0.6 hours, cinnamyl alcohol is added and reacted for 1.5-2.5 hours, and then di-n-butylamine is gradually added until the -NCO content is less than 0.5%, thus obtaining polyurethane modified acrylate.

[0034] By adopting the above technical solution, diisocyanate first reacts with polyether diol to form polyurethane prepolymer, and then hydroxy acrylate, tung oil monohydric alcohol and cinnamyl alcohol are added to promote the smooth progress of the reaction.

[0035] Optionally, the method for preparing the tung oil monohydric alcohol includes the following steps:

[0036] Under the protection of an inert gas, glyceryl tung oil and methylethanolamine are mixed, a strong base is added, the mixture is heated to react, and then extracted to obtain tung oil monohydric alcohol.

[0037] In summary, this application has the following beneficial effects:

[0038] 1. The substrate of this application is provided with a textured acrylic coating and an aluminum plating layer on both sides respectively. The substrate does not need to be mechanically drawn. The aluminum plating layer and the substrate can maintain a stable interface bond, which improves the surface smoothness and adhesion of the aluminum plating layer. The metallic properties of the aluminum plating layer and the texture properties of the acrylic coating give the aluminum plating film a metallic luster and texture, and maintain the continuity of this texture.

[0039] 2. Using polyurethane-modified acrylate as one of the components of the coating improves the flexibility of the acrylate coating. Tung oil monohydric alcohol and cinnamyl alcohol are added for further modification. Tung oil monohydric alcohol has long flexible segments and multiple carbon-carbon double bonds, which can form a network polymer structure with good extensibility. The addition of cinnamyl alcohol can make up for the lack of rigidity of the polymer structure, thus making the acrylate coating easy to emboss. After embossing, the texture structure has high stability and maintains the continuity of the metallic texture effect. Attached Figure Description

[0040] Figure 1 This is a planar layer structure diagram of the aluminum-coated film in Embodiment 1 of this application.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Substrate; 2. Aluminum plating layer; 3. Acrylic coating. Detailed Implementation

[0043] The following is in conjunction with the appendix Figure 1 This application will be described in further detail.

[0044] Preliminary Example 1

[0045] The preparation method of tung oil monohydric alcohol includes the following steps:

[0046] Weigh out 4 kg of tung oil glyceryl ester, 1 kg of methylethanolamine, and 0.52 kg of sodium ethoxide.

[0047] Nitrogen gas was introduced into the reaction vessel for protection. Tung oil glycerol and methylethanolamine were added to the reaction vessel and mixed evenly. Sodium ethoxide was then added and the mixture was reacted at 90°C for 7 hours. After the reaction was completed, the mixture was cooled, and water and carbon tetrachloride were added for extraction. The carbon tetrachloride layer was collected and removed by rotary evaporation. After drying, tung oil monohydric alcohol was obtained.

[0048] Preliminary Example 2

[0049] The preparation method of tung oil diol includes the following steps:

[0050] Weigh out 4 kg of tung oil glyceryl ester, 1.4 kg of diethanolamine, and 0.52 kg of sodium ethoxide.

[0051] Nitrogen gas was introduced into the reaction vessel for protection. Tung oil glycerol and diethanolamine were added to the reaction vessel and mixed evenly. Sodium ethoxide was then added, and the mixture was reacted at 90°C for 7 hours. After the reaction was completed, the mixture was cooled, and water and carbon tetrachloride were added for extraction. The carbon tetrachloride layer was collected and removed by rotary evaporation. After drying, tung oil diol was obtained.

[0052] Preparation Example 1

[0053] A method for preparing polyurethane-modified acrylate includes the following steps:

[0054] Weigh out 6.5 kg of polyether diol, 10 kg of diisocyanate, 2.7 kg of hydroxyacrylate, 2 kg of tung oil monohydric alcohol, and 0.5 kg of cinnamyl alcohol. The polyether diol is polyethylene glycol 400; the diisocyanate is 4,4'-diphenylmethane diisocyanate; the hydroxyacrylate is hydroxyethyl acrylate; and the tung oil monohydric alcohol was prepared from Preliminary Example 1.

[0055] Nitrogen gas was introduced into the reactor for protection. Polyether diol was added to the reactor and heated to 80°C. Diisocyanate was added and reacted for 1.5 h. The temperature was then lowered to 70°C. Hydroxyacrylate and tung oil monohydric alcohol were added and reacted for 0.3 h. Cinnamyl alcohol was added and reacted for 1.5 h. Di-n-butylamine was then added gradually, and the -NCO content in the reaction system was monitored during the reaction. Di-n-butylamine was stopped when the mass content of -NCO was less than 0.5%, and polyurethane-modified acrylate was obtained.

[0056] Preparation Example 2

[0057] A method for preparing polyurethane-modified acrylate includes the following steps:

[0058] Weigh out 8.5 kg of polyether diol, 10 kg of diisocyanate, 1.7 kg of hydroxyacrylate, 3.5 kg of tung oil monohydric alcohol, and 1 kg of cinnamyl alcohol. The polyether diol is polyethylene glycol 400; the diisocyanate is 4,4'-diphenylmethane diisocyanate; the hydroxyacrylate is hydroxyethyl acrylate; and the tung oil monohydric alcohol was prepared from Preliminary Example 1.

[0059] Nitrogen gas was introduced into the reactor for protection. Polyether diol was added to the reactor and heated to 90°C. Diisocyanate was added and reacted for 1 hour. The temperature was then lowered to 80°C. Hydroxyacrylate and tung oil monohydric alcohol were added and reacted for 0.6 hours. Cinnamyl alcohol was added and reacted for 2.5 hours. Di-n-butylamine was then added gradually, and the -NCO content in the reaction system was monitored during the reaction. Di-n-butylamine was stopped when the mass content of -NCO was less than 0.5%, thus obtaining polyurethane-modified acrylate.

[0060] Preparation Example 3

[0061] The preparation method of polyurethane modified acrylate differs from that of Preparation Example 1 in that the ratio of hydroxy acrylate, tung oil monohydric alcohol and cinnamyl alcohol is different.

[0062] Specifically, the composition is: 6.5 kg of polyether diol, 10 kg of diisocyanate, 1.7 kg of hydroxy acrylate, 2 kg of tung oil monohydric alcohol, and 2 kg of cinnamyl alcohol.

[0063] Preparation Example 4

[0064] A method for preparing polyurethane-modified acrylate includes the following steps:

[0065] Weigh out 6.5 kg of polyether diol, 10 kg of diisocyanate, 2.7 kg of hydroxy acrylate, and 3.1 kg of tung oil monohydric alcohol. The polyether diol is polyethylene glycol 400; the diisocyanate is 4,4'-diphenylmethane diisocyanate; the hydroxy acrylate is hydroxyethyl acrylate; and the tung oil monohydric alcohol was prepared from Preliminary Example 1.

[0066] Nitrogen gas was introduced into the reactor for protection. Polyether diol was added to the reactor and heated to 80°C. Diisocyanate was added and reacted for 1.5 h. The temperature was then lowered to 70°C. Hydroxy acrylate and tung oil monohydric alcohol were added and reacted for 1.8 h. Di-n-butylamine was then added gradually, and the -NCO content in the reaction system was monitored during the reaction. Di-n-butylamine was stopped when the mass content of -NCO was less than 0.5%, and polyurethane-modified acrylate was obtained.

[0067] Preparation Example 5

[0068] A method for preparing polyurethane-modified acrylate includes the following steps:

[0069] Weigh out 6.5 kg of polyether diol, 10 kg of diisocyanate, 2.7 kg of hydroxy acrylate, and 1.4 kg of cinnamyl alcohol. The polyether diol is polyethylene glycol 400; the diisocyanate is 4,4'-diphenylmethane diisocyanate; and the hydroxy acrylate is hydroxyethyl acrylate.

[0070] Nitrogen gas was introduced into the reactor for protection. Polyether diol was added to the reactor and heated to 80°C. Diisocyanate was added and reacted for 1.5 h. The temperature was then lowered to 70°C. Hydroxyacrylate was added and reacted for 0.3 h. Cinnamyl alcohol was added and reacted for 1.5 h. Di-n-butylamine was then added gradually, and the -NCO content in the reaction system was monitored during the reaction. Di-n-butylamine was stopped when the mass content of -NCO was less than 0.5%, and polyurethane-modified acrylate was obtained.

[0071] Preparation Example 6

[0072] A method for preparing polyurethane-modified acrylate includes the following steps:

[0073] Weigh out 6.5 kg of polyether diol, 10 kg of diisocyanate, 2.7 kg of hydroxyacrylate, 2 kg of tung oil diol, and 0.5 kg of cinnamyl alcohol. The polyether diol is polyethylene glycol 400; the diisocyanate is 4,4'-diphenylmethane diisocyanate; the hydroxyacrylate is hydroxyethyl acrylate; and the tung oil diol was prepared from Preliminary Example 2.

[0074] Nitrogen gas was introduced into the reactor for protection. Polyether diol was added to the reactor and heated to 80°C. Diisocyanate was added and reacted for 1.5 h. The temperature was then lowered to 70°C. Hydroxyacrylate and tung oil diol were added and reacted for 0.3 h. Cinnamyl alcohol was added and reacted for 1.5 h. Di-n-butylamine was then added gradually, and the -NCO content in the reaction system was monitored during the reaction. Di-n-butylamine was stopped when the mass content of -NCO was less than 0.5%, and polyurethane-modified acrylate was obtained.

[0075] Example 1

[0076] A method for preparing a metallic textured aluminum-coated film includes the following steps:

[0077] Weigh out 4.2 kg of polyurethane-modified acrylate, 3 kg of acrylate monomer, and 0.1 kg of photoinitiator. The polyurethane-modified acrylate was prepared in Preparation Example 1; the acrylate monomer included 2 kg of ethyl acrylate and 1 kg of pentaerythritol tetraacrylate; the photoinitiator was IRGACURE 500.

[0078] Polyurethane-modified acrylate, acrylate monomer and photoinitiator are mixed and stirred at 1000 rpm for 15 min to obtain acrylate coating.

[0079] like Figure 1 As shown, a PET film is used as substrate 1, and an acrylic coating is applied to one side of substrate 1. After being irradiated with UV light at a wavelength of 420nm, it is cured to form an acrylic coating 3 with a thickness of 5μm.

[0080] The acrylic coating 3 is embossed using an embossing roller to create a texture.

[0081] The side of the substrate 1 facing away from the acrylate coating 3 is subjected to plasma treatment by glow discharge. The working gas in the plasma treatment method is air, the working gas flow rate is 1200 sccm, and the plasma treatment power is 1.8 kW.

[0082] Finally, the substrate is fed into a vacuum evaporation equipment, and aluminum is vacuum evaporated on the plasma-treated side. During the vacuum evaporation process, the aluminum evaporation speed is 3.5 m / s, the temperature of the heated aluminum wire is 1400℃, and the wire feeding speed is 680 mm / min, forming an aluminum layer 2 with a thickness of 450 angstroms. Then, it is dried and cured in a 60℃ oven for 72 hours to obtain a metallic textured aluminum film.

[0083] Example 2

[0084] A method for preparing a metallic textured aluminum-coated film includes the following steps:

[0085] Weigh out 5.1 kg of polyurethane-modified acrylate, 3.5 kg of acrylate monomer, and 0.3 kg of photoinitiator. The polyurethane-modified acrylate was prepared in Preparation Example 2; the acrylate monomer included 2 kg of ethyl acrylate and 1 kg of pentaerythritol tetraacrylate; the photoinitiator was IRGACURE 500.

[0086] Polyurethane-modified acrylate, acrylate monomer and photoinitiator are mixed and stirred at 1000 rpm for 15 min to obtain acrylate coating.

[0087] PET film is used as the substrate, and an acrylic coating is applied to one side of the substrate. After being irradiated with UV light at a wavelength of 420nm, the coating is cured to form an acrylic coating with a thickness of 5μm.

[0088] The acrylic coating is embossed using an embossing roller to create a texture.

[0089] The side of the substrate away from the acrylate coating is subjected to plasma treatment by glow discharge. The working gas in the plasma treatment method is air, the working gas flow rate is 1200 sccm, and the plasma treatment power is 1.8 kW.

[0090] Finally, the substrate is fed into a vacuum evaporation equipment, and aluminum is vacuum evaporated on the plasma-treated side. During the vacuum evaporation process, the aluminum evaporation speed is 3.5 m / s, the temperature of the heated aluminum wire is 1400℃, and the wire feeding speed is 680 mm / min, forming an aluminum layer with a thickness of 450 angstroms. Then, it is dried and cured in a 60℃ oven for 72 hours to obtain a metallic textured aluminum film.

[0091] Example 3

[0092] A method for preparing a metallic textured aluminum-coated film differs from Example 1 in that it uses a different acrylic coating.

[0093] Weigh out 4.6 kg of polyurethane-modified acrylate, 3.2 kg of acrylate monomer, and 0.2 kg of photoinitiator. The polyurethane-modified acrylate was prepared in Preparation Example 1; the acrylate monomer included 2 kg of ethyl acrylate and 1 kg of pentaerythritol tetraacrylate; the photoinitiator was IRGACURE 500.

[0094] Polyurethane-modified acrylate, acrylate monomer and photoinitiator are mixed and stirred at 1000 rpm for 15 min to obtain acrylate coating.

[0095] Example 4

[0096] A method for preparing a metallic textured aluminum-coated film differs from Example 1 in that it uses a different acrylic coating.

[0097] Weigh out 4.2 kg of polyurethane-modified acrylate, 3 kg of acrylate monomer, and 0.1 kg of photoinitiator. The polyurethane-modified acrylate was prepared in Preparation Example 3; the acrylate monomer included 2 kg of ethyl acrylate and 1 kg of pentaerythritol tetraacrylate; the photoinitiator was IRGACURE 500.

[0098] Polyurethane-modified acrylate, acrylate monomer and photoinitiator are mixed and stirred at 1000 rpm for 15 min to obtain acrylate coating.

[0099] Example 5

[0100] A method for preparing a metallic textured aluminum-coated film differs from Example 1 in that it uses a different acrylic coating.

[0101] Weigh out 4.2 kg of polyurethane-modified acrylate, 3 kg of acrylate monomer, and 0.1 kg of photoinitiator. The polyurethane-modified acrylate was prepared in Preparation Example 1; the acrylate monomer included 2 kg of ethyl acrylate and 1 kg of trimethylolpropane triacrylate; the photoinitiator was IRGACURE 500.

[0102] Polyurethane-modified acrylate, acrylate monomer and photoinitiator are mixed and stirred at 1000 rpm for 15 min to obtain acrylate coating.

[0103] Example 6

[0104] A method for preparing a metallic textured aluminum-coated film differs from Example 1 in that it uses a different acrylic coating.

[0105] Weigh out 4.2 kg of polyurethane-modified acrylate, 3 kg of acrylate monomer, and 0.1 kg of photoinitiator. The polyurethane-modified acrylate was prepared in Preparation Example 1; the acrylate monomer included 2 kg of methyl methacrylate and 1 kg of trimethylolpropane triacrylate; the photoinitiator was IRGACURE 500.

[0106] Polyurethane-modified acrylate, acrylate monomer and photoinitiator are mixed and stirred at 1000 rpm for 15 min to obtain acrylate coating.

[0107] Example 7

[0108] A method for preparing a metallic textured aluminum-coated film differs from Example 1 in that it uses a different acrylic coating.

[0109] Weigh out 4.2 kg of polyurethane-modified acrylate, 3 kg of acrylate monomer, and 0.1 kg of photoinitiator. The polyurethane-modified acrylate was prepared in Preparation Example 1; the acrylate monomer included 1.7 kg of ethyl acrylate and 1.3 kg of trimethylolpropane triacrylate; the photoinitiator was IRGACURE 500.

[0110] Polyurethane-modified acrylate, acrylate monomer and photoinitiator are mixed and stirred at 1000 rpm for 15 min to obtain acrylate coating.

[0111] Comparative Example 1

[0112] A method for preparing a metallic textured aluminum-coated film includes the following steps:

[0113] Using PET fiber film as the substrate, the fiber surface is subjected to plasma treatment by glow discharge. The working gas in the plasma treatment method is air, the working gas flow rate is 1200 sccm, and the plasma treatment power is 1.8 kW.

[0114] Finally, the substrate is fed into a vacuum evaporation equipment, and aluminum is vacuum evaporated onto the plasma-treated wire-drawn surface. During the vacuum evaporation process, the aluminum evaporation speed is 3.5 m / s, the temperature of the heated aluminum wire is 1400℃, and the wire feeding speed is 680 mm / min, forming an aluminum evaporation layer with a thickness of 450 angstroms. Then, it is dried and cured in a 60℃ oven for 72 hours to obtain a metallic textured aluminum evaporation film.

[0115] Comparative Example 2

[0116] A method for preparing a metallic textured aluminum-coated film differs from Example 1 in that it uses a different acrylic coating.

[0117] Weigh out 4.2 kg of polyurethane-modified acrylate, 3 kg of acrylate monomer, and 0.1 kg of photoinitiator. The polyurethane-modified acrylate was prepared in Preparation Example 4; the acrylate monomer included 2 kg of ethyl acrylate and 1 kg of trimethylolpropane triacrylate; the photoinitiator was IRGACURE 500.

[0118] Polyurethane-modified acrylate, acrylate monomer and photoinitiator are mixed and stirred at 1000 rpm for 15 min to obtain acrylate coating.

[0119] Comparative Example 3

[0120] A method for preparing a metallic textured aluminum-coated film differs from Example 1 in that it uses a different acrylic coating.

[0121] Weigh out 4.2 kg of polyurethane-modified acrylate, 3 kg of acrylate monomer, and 0.1 kg of photoinitiator. The polyurethane-modified acrylate was prepared in Preparation Example 5; the acrylate monomer included 2 kg of ethyl acrylate and 1 kg of trimethylolpropane triacrylate; the photoinitiator was IRGACURE 500.

[0122] Polyurethane-modified acrylate, acrylate monomer and photoinitiator are mixed and stirred at 1000 rpm for 15 min to obtain acrylate coating.

[0123] Comparative Example 4

[0124] A method for preparing a metallic textured aluminum-coated film differs from Example 1 in that it uses a different acrylic coating.

[0125] Weigh out 4.2 kg of polyurethane-modified acrylate, 3 kg of acrylate monomer, and 0.1 kg of photoinitiator. The polyurethane-modified acrylate was prepared in Preparation Example 6; the acrylate monomer included 2 kg of ethyl acrylate and 1 kg of trimethylolpropane triacrylate; the photoinitiator was IRGACURE 500.

[0126] Polyurethane-modified acrylate, acrylate monomer and photoinitiator are mixed and stirred at 1000 rpm for 15 min to obtain acrylate coating.

[0127] Performance testing

[0128] The following tests were performed on the metallic textured aluminum films prepared in Examples 1-7 and Comparative Examples 1-4.

[0129] Adhesion of the aluminum coating: Referring to QB / T 2358-1998 "Test Method for Heat Seal Strength of Plastic Film Packaging Bags", the heat-sealing layer of EAA film was heat-sealed with the aluminum coating layer of the metallic textured aluminum film. The heat-sealing temperature was 125℃, the pressure was 0.25MPa, and the heat-sealing time was 1.8s. Then, the aluminum coating layer was peeled off from the metallic textured aluminum film using a tensile testing machine to obtain the adhesion data. The results are shown in Table 1.

[0130] Coating adhesion: Referring to QB / T 2358-1998 "Test Method for Heat Seal Strength of Plastic Film Packaging Bags", the heat-sealing layer of EAA film was heat-sealed with the acrylic coating of metallic textured aluminized film at a heat-sealing temperature of 105℃, a pressure of 0.20MPa, and a heat-sealing time of 2s. Then, the coating was peeled off from the metallic textured aluminized film using a tensile testing machine to obtain the adhesion data. The results are shown in Table 1.

[0131] Coating adhesion and durability: The metallic textured aluminum film was aged in a test chamber at 120°C and 85% humidity for 240 hours, and then the coating adhesion was tested. The results are shown in Table 1.

[0132] Table 1

[0133]

[0134]

[0135] Based on the above test results, it can be found that, taking Example 1 and Comparative Example 1 as examples, since the aluminum plating layer of Example 1 is attached to the complete PET film substrate, the adhesion of the aluminum plating layer is higher.

[0136] Taking Example 1 and Comparative Examples 2-4 as examples, when there was no significant difference in coating adhesion, the coating adhesion of Example 1 was better maintained after aging, proving that the coating stability was better. The addition of tung oil monohydric alcohol and cinnamyl alcohol to the polyurethane modified acrylate of the coating helps to balance the flexibility and stability of the coating, thereby improving the coating's aging resistance and maintaining the continuity of the metallic luster texture.

[0137] Taking Examples 1-3 and Example 4 as examples, the adhesion of the coating in Example 4 decreased after aging, indicating that selecting an appropriate ratio of tung oil monohydric alcohol and cinnamyl alcohol can further improve the aging resistance of the coating.

[0138] Taking Examples 1 and 5-7 as examples, the adhesion of the coating after aging in Examples 6-7 is improved, indicating that the cross-linking structure formed by the acrylate monomers in the coating will also affect the stability of the coating to a certain extent, thereby enhancing the sustainability of the metallic luster texture effect of the aluminized film.

[0139] In addition, the metallic luster texture of the aluminum-coated film was evaluated.

[0140] After the aluminized film was prepared, except for Comparative Examples 3 and 4, the aluminized films of the other examples and comparative examples all showed clear, delicate and smooth textures with good metallic luster. However, the texture edges of Comparative Examples 3-4 were relatively hard, and there were a few cracks outside the texture. This indicates that the addition of tung oil monohydric alcohol to the polyurethane modified acrylate of the coating can improve the flexibility of the coating and make it easier to emboss. However, the addition of tung oil dihydric alcohol will lead to a denser cross-linked structure and reduce the flexibility of the coating.

[0141] After the aluminized film aged, its surface was repeatedly scraped 50 times with a soft scraper, and its appearance was then observed (Examples 1-7 and Comparative Example 2 were scraped coatings, while Comparative Example 1 was a scraped aluminized layer). The results showed that the aluminized films of Examples 1-7 maintained a clear and smooth texture effect and retained their metallic luster, while the aluminized films of Comparative Examples 1 and 2 had some of their originally separated texture channels intersecting, resulting in poor texture clarity and flatness.

[0142] 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 metal luster texture aluminized film, characterized by: The base material is provided with an acrylic coating on one side and an aluminum plating layer on the other side, the surface of the acrylic coating is embossed to form a texture. The acrylic coating is prepared from raw materials including: Polyurethane modified acrylic ester 42~51 parts; Acrylic monomer 30~35 parts; Photoinitiator 1~3 parts; The polyurethane modified acrylic ester is prepared by reacting a polyurethane prepolymer with hydroxy acrylic ester, tung oil monol and cinnamyl alcohol.

2. The metal-gloss texture aluminized film according to claim 1, characterized by: The polyurethane prepolymer is prepared from diisocyanate and polyether diol, the mass ratio of diisocyanate, polyether diol, hydroxy acrylic ester, tung oil monol and cinnamyl alcohol is 1:(0.65~0.85):(0.17~0.27):(0.20~0.35):(0.05~0.1).

3. The metal-gloss texture aluminized film according to claim 1, characterized by: The acrylic monomer includes one or more of methyl acrylate, ethyl acrylate, propyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, trimethylolpropane triacrylate and pentaerythritol tetraacrylate.

4. The metal-gloss texture aluminized film according to claim 3, characterized by: The acrylic monomer includes methyl methacrylate and trimethylolpropane triacrylate, the mass ratio of methyl methacrylate to trimethylolpropane triacrylate is 1:(0.50~0.76).

5. The metal-gloss texture aluminized film according to claim 1, characterized by: The polyether diol includes one or both of polyethylene glycol and polypropylene glycol.

6. The metal-gloss texture aluminized film according to claim 1, wherein: The diisocyanate includes one or both of diphenylmethane diisocyanate and isophorone diisocyanate.

7. The method of claim 1-6, wherein the method of producing a metallic luster texture aluminum plated film is characterized by: The method includes the following steps: Mixing and stirring polyurethane modified acrylic ester, acrylic monomer and photoinitiator to obtain acrylic coating; Coating the acrylic coating on one side of the base material, curing after UV light irradiation to form an acrylic coating layer; Embossing the acrylic coating layer to form a texture; Vacuum aluminum evaporation on the other side of the base material to form an aluminum plating layer, drying and curing to obtain a metal gloss textured aluminum plating film.

8. The method for preparing a metallic textured aluminum-coated film according to claim 7, characterized in that: The base material is subjected to plasma surface treatment before vacuum aluminum evaporation.

9. The method for preparing a metallic textured aluminum-coated film according to claim 7, characterized in that: The preparation method of the polyurethane modified acrylic ester includes the following steps: Heating the polyether diol to 80~90℃ under the protection of inert gas, adding diisocyanate and reacting for 1~1.5h, then cooling to 70~80℃, then adding hydroxy acrylic ester and tung oil monol and reacting for 0.3~0.6h, then adding cinnamyl alcohol and reacting for 1.5~2.5h, then gradually adding di-n-butylamine until the content of -NCO is less than 0.5%, to obtain polyurethane modified acrylic ester.

10. The method for preparing a metallic textured aluminum-coated film according to claim 9, characterized in that: The preparation method of the tung oil monol includes the following steps: Mixing tung oil acid glyceride and methyl ethanolamine under the protection of inert gas, adding strong base, heating and reacting, and extracting to obtain tung oil monol.

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