Metallic luster texture aluminum laminated film and preparation method thereof

Abstract

The invention discloses a metallic luster texture aluminum laminated film and a preparation method thereof, and belongs to the field of film plating. An aluminum laminated film with metallic luster textures comprises a base material, an acrylate coating is arranged on one side of the base material, an aluminum laminated layer is arranged on the other side of the base material, the acrylate coating is formed by curing acrylate paint, and textures are formed on the surface of the acrylate coating through embossing treatment; the acrylate coating is prepared from the following raw materials in parts by weight: 42-51 parts of polyurethane modified acrylate; 30 to 35 parts of an acrylate monomer; 4-8 parts of a photoinitiator; the polyurethane modified acrylate is prepared by reacting a polyurethane prepolymer with hydroxyl acrylate, tung oil monohydric alcohol and cinnamyl alcohol. The method has the advantage that the continuity of the metal texture effect is improved.

Description

Technical Field

[0001] The present application relates to the field of film coating, and in particular to a metallic gloss texture aluminum-coated film and a preparation method thereof. Background Art

[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 door panels, computer panels, etc. It can also be used for packaging materials. In order to make the aluminized film more metallic, people have developed brushed aluminized film based on the aluminized film to imitate the metallic luster and texture of metal materials, thereby improving the visual effect of exterior decoration.

[0003] A common production method for aluminized film with a metal texture effect is to mechanically draw the PET film using a drawing device to form a drawing surface on one side of the PET film, and then fix the aluminum layer to the drawing surface through vacuum aluminum plating to obtain an aluminized film with a metal texture.

[0004] However, since the substrate of the above-mentioned aluminum-plated film has been subjected to a wire drawing process, the contact between the aluminum layer and the substrate is affected, resulting in poor adhesion of the aluminum layer. After long-term use, the texture of the metal is affected, reducing the performance of the texture of the metal. Summary of the invention

[0005] In order to improve the sustainability of the metal texture effect, the present application provides a metal gloss texture aluminum-plated film and a preparation method thereof.

[0006] In the first aspect, the present application provides a metallic gloss texture aluminum-plated film using the following technical solutions: A metallic gloss textured aluminum-plated film comprises a substrate, one side of the substrate is provided with an acrylate coating, and the other side is provided with an aluminum-plated layer, the acrylate coating is formed by curing an acrylate coating, and the surface of the acrylate coating is embossed to form a texture; The acrylic paint is prepared from the following raw materials in parts by weight: 42-51 parts of polyurethane modified acrylate; 30-35 parts of acrylate monomer; 4 to 8 parts of photoinitiator; The polyurethane modified acrylate is prepared by reacting a polyurethane prepolymer with hydroxy acrylate, tung oil monohydric alcohol and cinnamyl alcohol.

[0007] By adopting the above technical solution, a textured acrylic coating and an aluminum-plated layer are respectively provided on both sides of the substrate. The substrate does not need to be mechanically brushed, and the aluminum-plated layer and the substrate can maintain a stable interface bond, thereby improving the surface flatness and adhesion of the aluminum-plated layer. Through the metal properties of the aluminum-plated layer and the texture properties of the acrylic coating, the aluminum-plated film is given a metallic luster and texture texture, and the continuity of the texture is maintained.

[0008] Polyurethane modified acrylate is used as one of the components of the coating to improve the flexibility of the acrylate coating, and tung oil monoalcohol and cinnamyl alcohol are added for further modification. Tung oil monoalcohol has a long flexible chain segment and multiple carbon-carbon double bonds, which can form a network polymer structure with good ductility. The addition of cinnamyl alcohol can make up for the lack of rigidity of the polymer structure, thereby making the acrylate coating easy to emboss. The texture structure is highly stable after embossing, and the continuity of the metal texture effect is maintained.

[0009] Optionally, the polyurethane prepolymer is prepared by diisocyanate and polyether diol, and the mass ratio of the diisocyanate to the polyether diol, hydroxy acrylate, tung oil monool and cinnamyl alcohol is 1:(0.65-0.85):(0.17-0.27):(0.20-0.35):(0.05-0.1).

[0010] By adopting the above technical scheme, the ratio of the above raw materials, especially the ratio of tung oil monohydric alcohol to cinnamyl alcohol, is controlled, the ductility 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 aluminum-plated film.

[0011] Optionally, the raw materials for preparing the polyurethane modified acrylate include diisocyanate, polyether diol, hydroxy acrylate, tung oil monool, and cinnamyl alcohol, and the raw materials also include di-n-butylamine for consuming and detecting the remaining isocyanate.

[0012] 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.

[0013] By adopting the above technical solution, the addition of acrylate monomers enriches the cross-linking structure of the coating and maintains the structural strength of the coating foundation.

[0014] Optionally, the acrylate monomer includes methyl methacrylate and trimethylolpropane triacrylate, and the mass ratio of methyl methacrylate to trimethylolpropane triacrylate is 1:(0.50-0.76).

[0015] By adopting the above technical solution, methyl methacrylate is used as the preferred monofunctional acrylate monomer, and trimethylolpropane triacrylate is used as the preferred multifunctional acrylate monomer, so that the cross-linking structure is evenly distributed, and the embossed coating further improves the aging resistance.

[0016] Optionally, the polyether diol includes one or both of polyethylene glycol and polypropylene glycol.

[0017] Optionally, the diisocyanate includes one or both of diphenylmethane diisocyanate and isophorone diisocyanate.

[0018] Optionally, the hydroxyacrylate includes one or more of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate and hydroxypropyl methacrylate.

[0019] In the second aspect, the present application provides a method for preparing a metallic gloss texture aluminum-plated film using the following technical solution: A method for preparing a metallic gloss texture aluminum-plated film, comprising the following steps: The polyurethane modified acrylate, acrylate monomer and photoinitiator are mixed and stirred to obtain acrylate coating; Applying an acrylic coating on one side of the substrate and curing it under UV light to form an acrylic coating; The acrylic coating is embossed to create a texture; Aluminum is vacuum evaporated on the other side of the substrate to form an aluminum layer, which is then dried and solidified to obtain an aluminum film with a metallic luster texture. By adopting the above technical solution, an acrylate coating and embossing treatment are first prepared to solve the problem of low stability of the aluminum layer just after evaporation, and to avoid the influence of embossing on the stability of the aluminum layer. UV light curing helps to quickly obtain an acrylate coating with good stability.

[0020] Optionally, the substrate is subjected to plasma surface treatment before vacuum evaporation of aluminum.

[0021] By adopting the above technical solution, plasma surface treatment activates the surface of the substrate, generates more active groups, promotes the interface bonding between the aluminum coating and the substrate, and thus improves the adhesion of the aluminum coating.

[0022] Optionally, the preparation method of the polyurethane modified acrylate comprises the following steps: Under the protection of inert gas, the polyether diol is heated to 80-90°C, diisocyanate is added to react for 1-1.5 hours, then the temperature is lowered to 70-80°C, hydroxy acrylate and tung oil monool are added to react for 0.3-0.6 hours, cinnamyl alcohol is added to react for 1.5-2.5 hours, and di-n-butylamine is gradually added until the -NCO content is less than 0.5% to obtain polyurethane modified acrylate.

[0023] By adopting the above technical scheme, diisocyanate first reacts with polyether diol to form a polyurethane prepolymer, and then reacts and connects hydroxy acrylate, tung oil monool and cinnamyl alcohol to promote the smooth progress of the reaction.

[0024] Optionally, the method for preparing the tung oil monohydric alcohol comprises the following steps: Under the protection of inert gas, tung oil glyceride and methylethanolamine are mixed, strong base is added, heated for reaction, and extracted to obtain tung oil monohydric alcohol.

[0025] In summary, this application has the following beneficial effects: 1. The two sides of the substrate of the present application are respectively provided with a textured acrylic coating and an aluminum-plated layer. The substrate does not need to be mechanically brushed. The aluminum-plated layer and the substrate can maintain a stable interface bond, thereby improving the surface flatness and adhesion of the aluminum-plated layer. The metallic properties of the aluminum-plated layer and the texture properties of the acrylic coating give the aluminum-plated film a metallic luster and texture, and maintain the continuity of the texture.

[0026] 2. Polyurethane modified acrylate is used as one of the components of the coating to improve the flexibility of the acrylate coating, and tung oil monoalcohol and cinnamyl alcohol are added for further modification. Tung oil monoalcohol has a long flexible chain segment and multiple carbon-carbon double bonds, which can form a network polymer structure with good ductility. The addition of cinnamyl alcohol can make up for the lack of rigidity of the polymer structure, making the acrylate coating easy to emboss. The texture structure is highly stable after embossing, and the continuity of the metal texture effect is maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a planar layer structure diagram of the aluminum-plated film of Example 1 of the present application.

[0028] Description of reference numerals: 1. Substrate; 2. Aluminum coating; 3. Acrylic coating. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1 This application is described in further detail.

[0030] Preparatory Example 1 The preparation method of tung oil monohydric alcohol comprises the following steps: Weigh 4 kg of eleostearyl glyceride, 1 kg of methylethanolamine, and 0.52 kg of sodium ethoxide.

[0031] Nitrogen was introduced into the reaction kettle as protection, tung oil glyceride and methylethanolamine were added into the reaction kettle and mixed evenly, sodium ethoxide was 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 rotary evaporated to remove the carbon tetrachloride, and the mixture was dried to obtain tung oil monohydric alcohol.

[0032] Preparatory Example 2 The preparation method of tung oil diol comprises the following steps: Weigh 4 kg of eleostearyl glyceride, 1.4 kg of diethanolamine, and 0.52 kg of sodium ethoxide.

[0033] Nitrogen was introduced into the reaction kettle as protection, tung oil glyceride and diethanolamine were added into the reaction kettle and mixed evenly, sodium ethoxide was 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 rotary evaporated to remove carbon tetrachloride, and then dried to obtain tung oil diol.

[0034] Preparation Example 1 The preparation method of polyurethane modified acrylate comprises the following steps: Weigh 6.5 kg of polyether diol, 10 kg of diisocyanate, 2.7 kg of hydroxy acrylate, 2 kg of tung oil monool, and 0.5 kg of cinnamyl 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 monool is prepared according to Preparation Example 1.

[0035] Nitrogen was introduced into the reactor as protection, polyether diol was added into the reactor and heated to 80°C, diisocyanate was added and reacted for 1.5h, then the temperature was lowered to 70°C, hydroxy acrylate and tung oil monool were added and reacted for 0.3h, cinnamyl alcohol was added and reacted for 1.5h, and di-n-butylamine was gradually added. The -NCO content in the reaction system was detected during the reaction, and the addition of di-n-butylamine was stopped after the -NCO mass content was less than 0.5%, thereby obtaining polyurethane modified acrylate.

[0036] Preparation Example 2 The preparation method of polyurethane modified acrylate comprises the following steps: Weigh 8.5 kg of polyether diol, 10 kg of diisocyanate, 1.7 kg of hydroxy acrylate, 3.5 kg of tung oil monool, and 1 kg of cinnamyl 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 monool is prepared according to Preparation Example 1.

[0037] Nitrogen was introduced into the reactor as protection, polyether diol was added into the reactor and heated to 90°C, diisocyanate was added and reacted for 1 hour, then the temperature was lowered to 80°C, hydroxy acrylate and tung oil monool were added and reacted for 0.6 hour, cinnamyl alcohol was added and reacted for 2.5 hours, and di-n-butylamine was gradually added. The -NCO content in the reaction system was detected during the reaction, and the addition of di-n-butylamine was stopped after the -NCO mass content was less than 0.5%, thereby obtaining polyurethane modified acrylate.

[0038] Preparation Example 3 The preparation method of polyurethane modified acrylate is different from that of Preparation Example 1 in that the ratios of hydroxy acrylate, tung oil monohydric alcohol and cinnamyl alcohol are different.

[0039] Specifically, 6.5 kg of polyether diol, 10 kg of diisocyanate, 1.7 kg of hydroxy acrylate, 2 kg of tung oil monool, and 2 kg of cinnamyl alcohol.

[0040] Preparation Example 4 The preparation method of polyurethane modified acrylate comprises the following steps: Weigh 6.5 kg of polyether diol, 10 kg of diisocyanate, 2.7 kg of hydroxy acrylate, and 3.1 kg of tung oil monool. The polyether diol is polyethylene glycol 400; the diisocyanate is 4,4'-diphenylmethane diisocyanate; the hydroxy acrylate is hydroxyethyl acrylate; and the tung oil monool is prepared according to Preparatory Example 1.

[0041] Nitrogen was introduced into the reactor as protection, polyether diol was added into the reactor and heated to 80°C, diisocyanate was added and reacted for 1.5h, then the temperature was lowered to 70°C, hydroxy acrylate and tung oil monool were added and reacted for 1.8h, and then di-n-butylamine was gradually added. The -NCO content in the reaction system was detected during the reaction, and the addition of di-n-butylamine was stopped after the -NCO mass content was less than 0.5%, thereby obtaining polyurethane modified acrylate.

[0042] Preparation Example 5 The preparation method of polyurethane modified acrylate comprises the following steps: Weigh 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.

[0043] Nitrogen was introduced into the reactor as protection, polyether diol was added into the reactor and heated to 80°C, diisocyanate was added and reacted for 1.5h, then the temperature was lowered to 70°C, hydroxy acrylate was added and reacted for 0.3h, cinnamyl alcohol was added and reacted for 1.5h, and di-n-butylamine was gradually added. The -NCO content in the reaction system was detected during the reaction, and the addition of di-n-butylamine was stopped after the -NCO mass content was less than 0.5%, to obtain polyurethane modified acrylate.

[0044] Preparation Example 6 The preparation method of polyurethane modified acrylate comprises the following steps: Weigh 6.5 kg of polyether diol, 10 kg of diisocyanate, 2.7 kg of hydroxy acrylate, 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 hydroxy acrylate is hydroxyethyl acrylate; and the tung oil diol is prepared according to Preparation Example 2.

[0045] Nitrogen was introduced into the reactor as protection, polyether diol was added into the reactor and heated to 80°C, diisocyanate was added and reacted for 1.5h, then the temperature was lowered to 70°C, hydroxy acrylate and tung oil diol were added and reacted for 0.3h, cinnamyl alcohol was added and reacted for 1.5h, and di-n-butylamine was gradually added. The -NCO content in the reaction system was detected during the reaction, and the addition of di-n-butylamine was stopped after the -NCO mass content was less than 0.5%, thereby obtaining polyurethane modified acrylate.

[0046] Example 1 A method for preparing a metallic gloss textured aluminum-plated film comprises the following steps: Weigh 4.2 kg of polyurethane modified acrylate, 3 kg of acrylate monomer, and 0.1 kg of photoinitiator, wherein the polyurethane modified acrylate is prepared in Preparation Example 1; the acrylate monomer includes 2 kg of ethyl acrylate and 1 kg of pentaerythritol tetraacrylate; and the photoinitiator is IRGACURE 500.

[0047] The polyurethane modified acrylate, acrylate monomer and photoinitiator were mixed and stirred at 1000 rpm for 15 minutes to obtain an acrylate coating.

[0048] like Figure 1 As shown, a PET film is taken as a substrate 1, an acrylic coating is coated on one side of the substrate 1, and then irradiated with UV light with a wavelength of 420 nm to cure to form an acrylic coating 3, and the thickness of the acrylic coating 3 is 5 μm.

[0049] The acrylic coating 3 is embossed with an embossing roller to form a texture.

[0050] The side of the substrate 1 facing away from the acrylic coating 3 is subjected to a glow discharge plasma treatment. The working gas in the plasma treatment method is air, the working gas flow rate is 1200 sccm, and the power of the plasma treatment is 1.8 kW.

[0051] Finally, the substrate was sent to the vacuum evaporation equipment, and aluminum was vacuum evaporated on the plasma-treated side. During the vacuum evaporation process, the aluminum plating speed was 3.5m / s, the temperature of the heated aluminum wire was 1400°C, and the wire feeding speed of the aluminum wire was 680mm / min, forming an aluminum plating layer 2 with a thickness of 450 angstroms, and then dried and cured in a 60°C oven for 72 hours to obtain a metallic glossy textured aluminum plating film.

[0052] Example 2 A method for preparing a metallic gloss textured aluminum-plated film comprises the following steps: Weigh 5.1 kg of polyurethane modified acrylate, 3.5 kg of acrylate monomer, and 0.3 kg of photoinitiator, wherein the polyurethane modified acrylate is prepared in Preparation Example 2; the acrylate monomer includes 2 kg of ethyl acrylate and 1 kg of pentaerythritol tetraacrylate; and the photoinitiator is IRGACURE 500.

[0053] The polyurethane modified acrylate, acrylate monomer and photoinitiator were mixed and stirred at 1000 rpm for 15 minutes to obtain an acrylate coating.

[0054] A PET film was used as a substrate, and an acrylic coating was applied on one side of the substrate. The film was irradiated with UV light of 420 nm and then cured to form an acrylic coating. The thickness of the acrylic coating was 5 μm.

[0055] The acrylic coating is embossed using an embossing roller to create a texture.

[0056] The side of the substrate facing away from the acrylic coating was subjected to a glow discharge plasma treatment. The working gas in the plasma treatment method was air, the working gas flow rate was 1200 sccm, and the plasma treatment power was 1.8 kW.

[0057] Finally, the substrate was sent to the vacuum evaporation equipment, and aluminum was vacuum evaporated on the plasma-treated side. During the vacuum evaporation process, the aluminum plating speed was 3.5m / s, the temperature of the heated aluminum wire was 1400℃, and the wire feeding speed of the aluminum wire was 680mm / min, forming an aluminum plating layer with a thickness of 450 angstroms. It was then dried and cured in a 60℃ oven for 72 hours to obtain a metallic glossy textured aluminum-plated film.

[0058] Example 3 A method for preparing a metallic gloss textured aluminum-plated film, which differs from Example 1 in that the acrylic paint is different.

[0059] Weigh 4.6 kg of polyurethane modified acrylate, 3.2 kg of acrylate monomer, and 0.2 kg of photoinitiator, wherein the polyurethane modified acrylate is prepared in Preparation Example 1; the acrylate monomer includes 2 kg of ethyl acrylate and 1 kg of pentaerythritol tetraacrylate; and the photoinitiator is IRGACURE 500.

[0060] The polyurethane modified acrylate, acrylate monomer and photoinitiator were mixed and stirred at 1000 rpm for 15 minutes to obtain an acrylate coating.

[0061] Example 4 A method for preparing a metallic gloss textured aluminum-plated film, which differs from Example 1 in that the acrylic paint is different.

[0062] Weigh 4.2 kg of polyurethane modified acrylate, 3 kg of acrylate monomer, and 0.1 kg of photoinitiator, wherein the polyurethane modified acrylate is prepared in Preparation Example 3; the acrylate monomer includes 2 kg of ethyl acrylate and 1 kg of pentaerythritol tetraacrylate; and the photoinitiator is IRGACURE 500.

[0063] The polyurethane modified acrylate, acrylate monomer and photoinitiator were mixed and stirred at 1000 rpm for 15 minutes to obtain an acrylate coating.

[0064] Example 5 A method for preparing a metallic gloss textured aluminum-plated film, which differs from Example 1 in that the acrylic paint is different.

[0065] Weigh 4.2 kg of polyurethane modified acrylate, 3 kg of acrylate monomer, and 0.1 kg of photoinitiator, wherein the polyurethane modified acrylate is prepared in Preparation Example 1; the acrylate monomer includes 2 kg of ethyl acrylate and 1 kg of trimethylolpropane triacrylate; and the photoinitiator is IRGACURE 500.

[0066] The polyurethane modified acrylate, acrylate monomer and photoinitiator were mixed and stirred at 1000 rpm for 15 minutes to obtain an acrylate coating.

[0067] Example 6 A method for preparing a metallic gloss textured aluminum-plated film, which differs from Example 1 in that the acrylic paint is different.

[0068] Weigh 4.2 kg of polyurethane modified acrylate, 3 kg of acrylate monomer, and 0.1 kg of photoinitiator, wherein the polyurethane modified acrylate is prepared in Preparation Example 1; the acrylate monomer includes 2 kg of methyl methacrylate and 1 kg of trimethylolpropane triacrylate; and the photoinitiator is IRGACURE 500.

[0069] The polyurethane modified acrylate, acrylate monomer and photoinitiator were mixed and stirred at 1000 rpm for 15 minutes to obtain an acrylate coating.

[0070] Example 7 A method for preparing a metallic gloss textured aluminum-plated film, which differs from Example 1 in that the acrylic paint is different.

[0071] Weigh 4.2 kg of polyurethane modified acrylate, 3 kg of acrylate monomer, and 0.1 kg of photoinitiator, wherein the polyurethane modified acrylate is prepared in Preparation Example 1; the acrylate monomer includes 1.7 kg of ethyl acrylate and 1.3 kg of trimethylolpropane triacrylate; and the photoinitiator is IRGACURE 500.

[0072] The polyurethane modified acrylate, acrylate monomer and photoinitiator were mixed and stirred at 1000 rpm for 15 minutes to obtain an acrylate coating.

[0073] Comparative Example 1 A method for preparing a metallic gloss textured aluminum-plated film comprises the following steps: A PET drawing film was used as a substrate, and the drawing surface was subjected to a glow discharge plasma treatment. The working gas in the plasma treatment method was air, the working gas flow rate was 1200 sccm, and the plasma treatment power was 1.8 kW.

[0074] Finally, the substrate was sent to the vacuum evaporation equipment, and aluminum was vacuum evaporated on the brushed surface treated with plasma. During the vacuum evaporation process, the aluminum plating speed was 3.5m / s, the temperature of the heated aluminum wire was 1400℃, and the wire feeding speed of the aluminum wire was 680mm / min, forming an aluminum plating layer with a thickness of 450 angstroms, which was then dried and cured in a 60℃ oven for 72 hours to obtain a metallic glossy textured aluminum plating film.

[0075] Comparative Example 2 A method for preparing a metallic gloss textured aluminum-plated film, which differs from Example 1 in that the acrylic paint is different.

[0076] Weigh 4.2 kg of polyurethane modified acrylate, 3 kg of acrylate monomer, and 0.1 kg of photoinitiator, wherein the polyurethane modified acrylate is prepared in Preparation Example 4; the acrylate monomer includes 2 kg of ethyl acrylate and 1 kg of trimethylolpropane triacrylate; and the photoinitiator is IRGACURE 500.

[0077] The polyurethane modified acrylate, acrylate monomer and photoinitiator were mixed and stirred at 1000 rpm for 15 minutes to obtain an acrylate coating.

[0078] Comparative Example 3 A method for preparing a metallic gloss textured aluminum-plated film, which differs from Example 1 in that the acrylic paint is different.

[0079] Weigh 4.2 kg of polyurethane modified acrylate, 3 kg of acrylate monomer, and 0.1 kg of photoinitiator, wherein the polyurethane modified acrylate is prepared in Preparation Example 5; the acrylate monomer includes 2 kg of ethyl acrylate and 1 kg of trimethylolpropane triacrylate; and the photoinitiator is IRGACURE 500.

[0080] The polyurethane modified acrylate, acrylate monomer and photoinitiator were mixed and stirred at 1000 rpm for 15 minutes to obtain an acrylate coating.

[0081] Comparative Example 4 A method for preparing a metallic gloss textured aluminum-plated film, which differs from Example 1 in that the acrylic paint is different.

[0082] Weigh 4.2 kg of polyurethane modified acrylate, 3 kg of acrylate monomer, and 0.1 kg of photoinitiator, wherein the polyurethane modified acrylate is prepared in Preparation Example 6; the acrylate monomer includes 2 kg of ethyl acrylate and 1 kg of trimethylolpropane triacrylate; and the photoinitiator is IRGACURE 500.

[0083] The polyurethane modified acrylate, acrylate monomer and photoinitiator were mixed and stirred at 1000 rpm for 15 minutes to obtain an acrylate coating.

[0084] Performance Testing The following tests were performed on the metallic gloss textured aluminum-plated films prepared in Examples 1-7 and Comparative Examples 1-4.

[0085] Adhesion of aluminized layer: refer to QB / T 2358-1998 "Test method for heat sealing strength of plastic film packaging bags", heat seal the heat sealing layer of EAA film and the aluminized layer of metallic gloss texture aluminized film, the heat sealing temperature is 125℃, the pressure is 0.25MPa, and the heat sealing time is 1.8s. Then use a tensile testing machine to peel off the aluminized layer from the metallic gloss texture aluminized film to obtain adhesion data. The results are shown in Table 1.

[0086] Coating adhesion: With reference to QB / T 2358-1998 “Test method for heat seal strength of plastic film packaging bags”, the heat seal layer of the EAA film was heat-sealed with the acrylic coating of the metallic glossy texture aluminized film at a temperature of 105°C, a pressure of 0.20 MPa, and a heat-sealing time of 2 seconds. The coating was then peeled off from the metallic glossy texture aluminized film using a tensile testing machine to obtain adhesion data. The results are shown in Table 1.

[0087] Coating adhesion durability: The metallic gloss texture aluminum-plated film was placed in a test box at 120°C and 85% humidity for aging for 240 hours, and then the coating adhesion test was performed. The results are shown in Table 1.

[0088] Table 1 Combining the above test results, it can be found that, taking Example 1 and Comparative Example 1 as examples, since the aluminum-plated layer of Example 1 is attached to the complete PET film substrate, the adhesion of the aluminum-plated layer is higher.

[0089] Taking Example 1 and Comparative Examples 2-4 as examples, when there is no obvious difference in coating adhesion, the coating adhesion of Example 1 is better maintained after aging, proving that the coating has better stability. The introduction of tung oil monohydric alcohol and cinnamyl alcohol into the polyurethane modified acrylate of the coating helps to balance the flexibility and stability of the coating, thereby improving the coating's ability to resist aging and further maintaining the continuity of the metallic gloss texture.

[0090] Taking Examples 1-3 and Example 4 as examples, the adhesion of the coating of Example 4 is reduced after aging, indicating that selecting a suitable ratio of tung oil monohydric alcohol and cinnamyl alcohol can further improve the aging resistance of the coating.

[0091] Taking Example 1 and Examples 5-7 as examples, the adhesion of the coating of Examples 6-7 is improved after aging, indicating that the cross-linked structure formed by the acrylate monomer in the coating will also affect the stability of the coating to a certain extent, thereby enhancing the sustainability of the metallic gloss texture effect of the aluminum-plated film.

[0092] In addition, the metallic gloss texture of the aluminum plating film was evaluated.

[0093] After the aluminum-plated film was prepared, except for Comparative Examples 3 and 4, the aluminum-plated films of other embodiments and comparative examples all showed clear, delicate and smooth textures with good metallic luster, while the texture edges of Comparative Examples 3-4 were relatively stiff, and there were a small number of cracks outside the texture, indicating that the addition of tung oil monohydric alcohol to the polyurethane-modified acrylate of the coating can improve the flexibility of the coating and facilitate embossing, while the addition of tung oil dihydric alcohol will lead to a denser cross-linked structure and reduce the flexibility of the coating.

[0094] After the aluminum-plated film was aged, the surface of the aluminum-plated film was scraped back and forth 50 times with a soft scraper, and the appearance of the aluminum-plated film was observed (Examples 1-7 and Comparative Example 2 were scratched on the coating layer, and Comparative Example 1 was scratched on the aluminum-plated layer). The result was that the aluminum-plated films of Examples 1-7 could still maintain a clear and smooth texture effect, and the metallic luster was maintained, while the aluminum-plated films of Comparative Examples 1 and 2 had partially intersected texture channels that were originally separated, and the texture clarity was poor and the flatness was deteriorated.

[0095] This specific implementation manner is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the specific implementation manner as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A metallic luster textured aluminum film, characterized in that: The substrate comprises a substrate, one side of which is provided with an acrylate coating and the other side of which is provided with an aluminum-plated layer, the acrylate coating is formed by curing acrylate paint, and the surface of the acrylate coating is embossed to form a texture; The acrylic paint is prepared from the following raw materials in parts by weight: 42-51 parts of polyurethane modified acrylate; 30-35 parts of acrylate monomer; 1~3 parts of photoinitiator; The polyurethane modified acrylate is prepared by reacting a polyurethane prepolymer with hydroxy acrylate, tung oil monohydric alcohol and cinnamyl alcohol.

2. The metallic gloss textured aluminum-plated film according to claim 1, characterized in that: The polyurethane prepolymer is prepared from diisocyanate and polyether diol, and the mass ratio of the diisocyanate to the polyether diol, hydroxy acrylate, tung oil monool and cinnamyl alcohol is 1:(0.65-0.85):(0.17-0.27):(0.20-0.35):(0.05-0.1).

3. The metallic gloss textured aluminum-plated film according to claim 1, characterized in that: The acrylic acid ester 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 metallic gloss textured aluminum-plated film according to claim 3, characterized in that: The acrylic acid ester monomer comprises methyl methacrylate and trimethylolpropane triacrylate, and the mass ratio of the methyl methacrylate to the trimethylolpropane triacrylate is 1:(0.50-0.76).

5. The metallic gloss textured aluminum-plated film according to claim 1, characterized in that: The polyether diol includes one or both of polyethylene glycol and polypropylene glycol.

6. The metallic gloss texture aluminum-plated film according to claim 1, characterized in that: The diisocyanate includes one or both of diphenylmethane diisocyanate and isophorone diisocyanate.

7. A method for preparing a metallic gloss textured aluminum-plated film according to any one of claims 1 to 6, characterized in that: The following steps are involved: The polyurethane modified acrylate, acrylate monomer and photoinitiator are mixed and stirred to obtain acrylate coating; Applying an acrylic coating on one side of the substrate and curing it under UV light to form an acrylic coating; The acrylic coating is embossed to create a texture; Aluminum is vacuum-evaporated on the other side of the substrate to form an aluminum-plated layer, which is then dried and solidified to obtain an aluminum-plated film with a metallic luster and texture.

8. The method for preparing a metallic gloss texture aluminum-plated film according to claim 7, characterized in that: Before the substrate is vacuum evaporated with aluminum, it is firstly subjected to plasma surface treatment.

9. The method for preparing a metallic gloss texture aluminum-plated film according to claim 7, characterized in that: The preparation method of the polyurethane modified acrylate comprises the following steps: Under the protection of inert gas, the polyether diol is heated to 80-90°C, diisocyanate is added to react for 1-1.5h, then the temperature is lowered to 70-80°C, hydroxy acrylate and tung oil monool are added to react for 0.3-0.6h, cinnamyl alcohol is added to react for 1.5-2.5h, and di-n-butylamine is gradually added until the -NCO content is less than 0.5% to obtain polyurethane modified acrylate.

10. The method for preparing a metallic gloss texture aluminum-plated film according to claim 9, characterized in that: The preparation method of tung oil monohydric alcohol comprises the following steps: Under the protection of inert gas, tung oil glyceride and methylethanolamine are mixed, strong base is added, heated for reaction, and extracted to obtain tung oil monohydric alcohol.

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