High-speed coating alumite color layer coating and preparation method thereof

Abstract

The invention relates to a high-speed coating alumite color layer coating, and relates to the field of alumite. The alumite color layer coating capable of being coated at high speed comprises the following raw materials in parts by mass: 12-18 parts of organic silicon modified acrylic emulsion; 24 to 30 parts of water-based acrylic resin; 12 to 24 parts of maleic ester modified acrylic resin; 1-3 parts of a defoaming agent; 2-5 parts of a wetting dispersant; 1-2 parts of a leveling agent; 60 to 90 parts of water; 0.5-1 part of ammonia water; wherein the glass transition temperature of the organic silicon modified acrylic emulsion is 150 to 180 DEG C, the glass transition temperature of the water-based acrylic resin is 60 to 90 DEG C, and the glass transition temperature of the maleic anhydride modified acrylic resin is 80 to 100 DEG C. The complete curing speed of the color layer coating can be increased, and the coating speed is increased.

Description

Technical Field

[0001] The invention relates to the field of electrochemical aluminum, and in particular to a high-speed coated electrochemical aluminum color layer coating and a preparation method thereof. Background Art

[0002] Electroplated aluminum refers to a hot stamping material made of a coating and a vacuum-evaporated metal layer on a film substrate. Electroplated aluminum can be used to stamp various colors, patterns, and texts on paper, cigarette boxes, plastics, leather, wood, and other substrates, making the surface of the substrate more beautiful. Among them, laser electroplated aluminum has a beautiful holographic rainbow color and a variety of colors, and is one of the widely used anti-counterfeiting methods.

[0003] Laser electroplated aluminum includes base film, release layer, color layer, aluminum coating layer and adhesive layer. The base film acts as a carrier. The release layer has good shedding performance and is used to separate the color layer from the base film and transfer and bond it to the surface of the hot stamped object. Both the color layer and the aluminum coating layer can be used to display patterns or marks. The adhesive layer is used to bond the electroplated aluminum film to the substrate. Laser electroplated aluminum needs to use molding equipment to emboss the laser pattern on the color layer.

[0004] At present, laser color layer coatings are often made of acrylic resin, curing agent and solvent. The coating is applied on the release layer and then dried and cured to form a color layer. After the coating is applied, the acrylic resin and curing agent react and need to be completely cured in an oven for about 5 seconds. However, the oven length of the current coating equipment is 15-18 meters, resulting in a slow coating rate. The current coating rate is 75-100m / min, which is inefficient. Summary of the invention

[0005] In order to accelerate the complete curing speed of the color layer coating and improve the coating rate, the present application provides a high-speed coated electrochemical aluminum color layer coating and a preparation method thereof.

[0006] The present application provides a high-speed coated electrochemical aluminum color layer coating and a preparation method thereof using the following technical solutions: A high-speed coating electrochemical aluminum color layer coating comprises the following raw materials in parts by weight: 12-18 parts of silicone modified acrylic emulsion; 24-30 parts of water-based acrylic resin; 12-24 parts of maleate modified acrylic resin; 1-3 parts of defoaming agent; 2-5 parts of wetting and dispersing agent; 1-2 parts of leveling agent; 60-90 parts of water; 0.5-1 part of ammonia water; The glass transition temperature of the silicone-modified acrylic emulsion is 150-180°C, the glass transition temperature of the water-based acrylic resin is 60-90°C, and the glass transition temperature of the maleic anhydride-modified acrylic resin is 80-100°C.

[0007] Through the above technical scheme, the present application selects a combination of a silicone-modified acrylic emulsion with a high glass transition temperature and a water-based acrylic resin and a maleic anhydride-modified acrylic resin with a low glass transition temperature. No curing agent is required, and the color layer coating can be cured at a low temperature and the curing speed is fast, so that the coating speed can be increased to 250m / min, thereby improving production efficiency.

[0008] Through the complementarity of the two, the heat resistance and slitting properties of silicone-modified acrylic resin are used to ensure that the electroplated aluminum can remain unchanged under 145°C hot stamping and will not adhere to the molded plate during molding; the use of water-based acrylic resin and maleic anhydride-modified acrylic resin allows the coating to soften during molding, and the laser graphics are clear and obvious when molded at 175°C. Through the combination, the color layer coating, base film layer and aluminum plating layer have good adhesion, good slitting properties, and good laser effects.

[0009] Preferably, the organosilicon-modified acrylic emulsion is made from the following raw materials in parts by weight: Acrylic acid 5-15 parts; 10-18 parts of methyl methacrylate; 5-8 parts of isobornyl methacrylate; 3-7 parts of silicone monomer; 2-5 parts of emulsifier; 1-3 parts of initiator; 50-75 parts of deionized water.

[0010] Through the above technical scheme, acrylic acid is selected as the soft monomer, methyl methacrylate and isobornyl methacrylate are selected as the hard monomers, the glass transition temperature of the monomers is relatively high, and heat-resistant silicone monomers are used for modification to improve the toughness of the emulsion, so that the prepared silicone-modified acrylic emulsion is easy to form a film, and has good heat resistance and slitting properties. It will not change color during hot stamping and will not stick to the plate during molding.

[0011] Preferably, the organic silicon monomer is selected from one or more of vinyl trimethoxy silane, methacryloxypropyl trimethoxy silane, and 4-vinyl benzylamine-modified (3-glycidoxypropyl) trimethoxy silane.

[0012] Through the above technical solution, vinyl silane is selected to achieve cross-linking of silicone monomers and acrylic monomers, so that the coating structure has strong stability.

[0013] Preferably, the 4-vinylbenzylamine modified (3-glycidoxypropyl)trimethoxysilane is composed of the following raw materials in parts by weight: 40-55 parts of (3-glycidoxypropyl)trimethoxysilane; 13-20 parts of 4-vinylbenzylamine; 1-3 parts of catalyst.

[0014] Through the above technical scheme, the ring opening of epoxy groups and amine groups is promoted by a catalyst, so that a benzene ring is introduced into the silicone monomer, which promotes the toughness of the silicone-modified acrylic emulsion to be enhanced, the splitting property is improved, and it is beneficial to molding.

[0015] Preferably, the maleate-modified acrylic resin is made from the following raw materials in parts by weight: 5-7 parts of maleate monomer; Butyl methacrylate 35-40 parts; Acrylic acid 18-22 parts; 45-55 parts of styrene; 2-4 parts of initiator; 23-28 parts of solvent.

[0016] Through the above technical scheme, maleate monomer is selected to modify acrylic resin. Maleate monomer is used as mobile phase and mixed with styrene, acrylic acid and butyl methacrylate to improve the toughness of the resin, which is beneficial to form clear lines in molding and improve the brightness of the molding.

[0017] Preferably, the maleate monomer includes one or more of dibutyl maleate, ethylene glycol maleate, and dimethyl maleate.

[0018] Preferably, the molecular weight of the water-based acrylic resin is 6500-8000, and the acid value is 82-88 mgKOH / g.

[0019] Through the above technical scheme, the molecular weight and acid value of the water-based acrylic resin are controlled, and the viscosity and fluidity of the water-based acrylic resin are controlled, which is beneficial to improving the compatibility of the color layer coating system and facilitating the film-forming property and color development property of the coating.

[0020] The present application provides a method for preparing an electrochemical aluminum color layer coating by high-speed coating, comprising the following steps: Put water into a reaction kettle, add water-based acrylic resin and maleic anhydride-modified acrylic resin under stirring, heat to 75-95° C. until the water-based acrylic resin and maleic anhydride-modified acrylic resin are completely dissolved, add ammonia water to adjust the pH value to 7.5-8.5, and obtain an aqueous solution for use; Add silicone-modified acrylic emulsion to another reaction kettle, add aqueous solution under stirring, stir for 20-30 minutes, then add defoamer, wetting dispersant and leveling agent, continue stirring for 1-1.5 hours until mixed, add ammonia water to adjust the pH value to 7.5-8.5, and obtain electrochemical aluminum color layer coating.

[0021] According to the technical scheme, aqueous solutions of waterborne acrylic resin and maleate-modified acrylic resin are first prepared and then mixed with silicone-modified acrylic emulsion, so that the coating system has strong compatibility and stability and a simple preparation process.

[0022] Preferably, the organosilicon-modified acrylic emulsion is prepared by the following steps: Take acrylic acid, methyl methacrylate, isobornyl methacrylate and silicone monomer and mix them evenly at room temperature, add them into a solution consisting of part of deionized water and part of emulsifier, stir and emulsify to obtain a pre-emulsion; heat the remaining deionized water and emulsifier to 70-80°C, add part of the pre-emulsion and part of the initiator, and keep the temperature for reaction for 20-30 minutes; add the remaining pre-emulsion and initiator dropwise at 80-84°C within 2 hours, keep the temperature for reaction for 1-2 hours, cool and filter to obtain a silicone-modified acrylic emulsion.

[0023] Through the above technical scheme, a silicone-modified acrylic emulsion with excellent temperature resistance is obtained by seed polymerization.

[0024] Preferably, the maleate-modified acrylic resin is prepared by the following steps: The maleate monomer, butyl methacrylate, acrylic acid, styrene, initiator and solvent are uniformly mixed, and then polymerized at 65-75° C. and 0.8-2.2 MPa for 5-8 hours, and then the solvent is removed by reduced pressure distillation to obtain maleate modified acrylic resin.

[0025] In summary, this application has the following beneficial effects: The present application selects a combination of a silicone-modified acrylic emulsion with a high glass transition temperature and a water-based acrylic resin and a maleic anhydride-modified acrylic resin with a low glass transition temperature. No curing agent is required, and the color layer coating can be cured at a low temperature and the curing speed is fast, so that the coating speed can be increased to 250 m / min, thereby improving production efficiency.

[0026] Through the complementarity of the two, the heat resistance and slitting properties of silicone-modified acrylic resin are utilized to ensure that the electroplated aluminum can remain unchanged under 145°C hot stamping and will not adhere to the molded plate during molding; the use of water-based acrylic resin and maleic anhydride-modified acrylic resin allows the coating to soften during molding, and the laser graphics are clear and obvious when molded at 175°C. Through the combination, the color layer coating has good adhesion to the base film layer and the aluminum plating layer, and the slitting properties are good. DETAILED DESCRIPTION

[0027] The present application is further described in detail below in conjunction with Examples 1-6 and Comparative Examples 1-3.

[0028] Preparation Example Preparation Example 1 Silicone modified acrylic emulsion, including the following raw materials: Acrylic acid 5kg; Methyl methacrylate 10kg; Isobornyl methacrylate 5kg; 3 kg of organosilicon monomer, in this preparation example, the organosilicon monomer is specifically selected from vinyltrimethoxysilane; 2 kg of emulsifier, in this preparation example, the emulsifier specifically selected is 1 kg of reactive emulsifier ER-10 and 1 kg of nonionic emulsifier CO-430; 1 kg of initiator, in this preparation example, potassium persulfate is used as the initiator; 50kg of deionized water.

[0029] The silicone-modified acrylic emulsion was prepared by the following steps: Acrylic acid, methyl methacrylate, isobornyl methacrylate and silicone monomer are mixed evenly at room temperature, and then added into a solution consisting of 35 kg of deionized water and 1 kg of emulsifier, stirred and emulsified to obtain a pre-emulsion; the remaining deionized water and emulsifier are heated to 70°C, 1 / 3 of the pre-emulsion and 0.4 kg of initiator are added, and the reaction is kept warm for 20 minutes; the remaining pre-emulsion and initiator are added dropwise at 80°C within 2 hours, the reaction is kept warm for 1 hour, the temperature is cooled to room temperature, the pH is adjusted to 6.5 with ammonia water, and filtered with a 200-mesh sieve to obtain an acrylic resin emulsion, thereby obtaining a silicone-modified acrylic emulsion.

[0030] The glass transition temperature of the silicone-modified acrylic emulsion was measured to be 150°C.

[0031] Preparation Example 2 Silicone modified acrylic emulsion, including the following raw materials: Acrylic acid 15kg; Methyl methacrylate 18kg; Isobornyl methacrylate 8kg; 7 kg of organosilicon monomer, in this preparation example, the organosilicon monomer is specifically selected from methacryloxypropyltrimethoxysilane; 5 kg of emulsifier, in this preparation example, 3 kg of sodium n-octyl sulfate and 2 kg of nonylphenol polyoxyethylene ether are selected as the emulsifier; 3 kg of initiator, in this preparation example, ammonium persulfate is selected as the initiator; 75kg of deionized water.

[0032] The silicone-modified acrylic emulsion was prepared by the following steps: Take acrylic acid, methyl methacrylate, isobornyl methacrylate and silicone monomer and mix them evenly at room temperature, add them into a solution consisting of 50 kg of deionized water and 3.5 kg of emulsifier, stir and emulsify to obtain a pre-emulsion; heat the remaining deionized water and emulsifier to 80°C, add 2 / 5 of the pre-emulsion and 1.8 kg of initiator, and keep warm for reaction for 30 minutes; add the remaining pre-emulsion and initiator dropwise at 84°C within 2 hours, keep warm for reaction for 2 hours, cool to room temperature, adjust the pH to 6.5 with ammonia water, filter with a 200-mesh sieve to obtain an acrylic resin emulsion, and obtain a silicone-modified acrylic emulsion.

[0033] The glass transition temperature of the silicone-modified acrylic emulsion was measured to be 157°C.

[0034] Preparation Example 3 Silicone modified acrylic emulsion, including the following raw materials: Acrylic acid 10kg; Methyl methacrylate 14kg; Isobornyl methacrylate 7kg; 5 kg of organosilicon monomer, in this preparation example, 2 kg of vinyl trimethoxy silane and 3 kg of methacryloxypropyl trimethoxy silane are used as the organosilicon monomer; 3 kg of emulsifier, in this preparation example, the emulsifier is specifically selected from 1.8 kg of sodium salt of dibutyl sulfosuccinate and 1.2 kg of sodium salt of succinic acid monooctadecylamide sulfonate; 2 kg of initiator, in this preparation example, the initiator is specifically selected from potassium persulfate; 60kg of deionized water.

[0035] The silicone-modified acrylic emulsion was prepared by the following steps: Take acrylic acid, methyl methacrylate, isobornyl methacrylate and silicone monomer and mix them evenly at room temperature, add them into a solution consisting of 45 kg of deionized water and 2.2 kg of emulsifier, stir and emulsify to obtain a pre-emulsion; heat the remaining deionized water and emulsifier to 75°C, add 2 / 5 of the pre-emulsion and 1.5 kg of initiator, and keep warm for reaction for 25 minutes; add the remaining pre-emulsion and initiator dropwise at 82°C within 2 hours, keep warm for reaction for 1.5 hours, cool to room temperature, adjust the pH to 6.5 with ammonia water, filter with a 200-mesh sieve to obtain an acrylic resin emulsion, and obtain a silicone-modified acrylic emulsion.

[0036] The glass transition temperature of the silicone-modified acrylic emulsion was measured to be 160°C.

[0037] Preparation Example 4 The difference between this preparation example and preparation example 1 is that the organic silicon monomer is 4-vinylbenzylamine modified (3-glycidoxypropyl)trimethoxysilane.

[0038] 4-vinylbenzylamine modified (3-glycidoxypropyl)trimethoxysilane is prepared from the following raw materials: (3-Glycidoxypropyl)trimethoxysilane 3.5 kg; 4-vinylbenzylamine 1.4 kg; 0.1 kg of catalyst, stannous octoate is selected as the catalyst.

[0039] The preparation method is as follows: add 8 kg of dimethyl sulfoxide into a reaction kettle, start stirring, add (3-glycidoxypropyl)trimethoxysilane, 4-vinylbenzylamine and a catalyst, heat to 75°C, react for 2 hours, remove dimethyl sulfoxide by vacuum distillation, wash and dry to obtain 4-vinylbenzylamine-modified (3-glycidoxypropyl)trimethoxysilane.

[0040] The glass transition temperature of the silicone-modified acrylic emulsion was measured to be 180°C.

[0041] Preparation Example 5 The difference between this preparation example and preparation example 1 is that the organic silicon monomer is 4-vinylbenzylamine modified (3-glycidoxypropyl)trimethoxysilane.

[0042] 4-vinylbenzylamine modified (3-glycidoxypropyl)trimethoxysilane is prepared from the following raw materials: (3-Glycidoxypropyl)trimethoxysilane 5kg; 4-vinylbenzylamine 1.8 kg; 0.3 kg of catalyst, stannous octoate is selected as the catalyst.

[0043] The preparation method is as follows: add 10 kg of dimethyl sulfoxide into a reaction kettle, start stirring, add (3-glycidoxypropyl)trimethoxysilane, 4-vinylbenzylamine and a catalyst, heat to 80°C, react for 3 hours, remove dimethyl sulfoxide by vacuum distillation, wash and dry to obtain 4-vinylbenzylamine-modified (3-glycidoxypropyl)trimethoxysilane.

[0044] The glass transition temperature of the silicone-modified acrylic emulsion was measured to be 172°C.

[0045] Preparation Example 6 Maleate modified acrylic resin includes the following raw materials: 0.5 kg of maleate monomer, in this preparation example, dibutyl maleate is used as the maleate monomer; Butyl methacrylate 3.5 kg; Acrylic acid 1.8kg; Styrene 4.5kg; 0.2 kg of initiator. In this preparation example, di-tert-butyl peroxide is used as the initiator; 2.3 kg of solvent. In this preparation example, toluene is used as the solvent.

[0046] The preparation method of maleate modified acrylic resin is: The maleate monomer, butyl methacrylate, acrylic acid, styrene, initiator and solvent were uniformly mixed, and then polymerized at 65° C. and 0.8 MPa for 5 hours. The solvent was then removed by distillation under reduced pressure, and the discharged material was cooled to room temperature to obtain maleate-modified acrylic resin.

[0047] The glass transition temperature of maleate-modified acrylic resin was measured to be 80°C.

[0048] Preparation Example 7 Maleate modified acrylic resin includes the following raw materials: 0.7 kg of maleate monomer, in this preparation example, maleate monomer is ethylene glycol maleate; Butyl methacrylate 4kg; Acrylic acid 2.2kg; Styrene 5.5kg; 0.4 kg of initiator. In this preparation example, azobisisobutyronitrile is used as the initiator; 2.8 kg of solvent. In this preparation example, ethyl acetate was selected as the solvent.

[0049] The preparation method of maleate modified acrylic resin is: The maleate monomer, butyl methacrylate, acrylic acid, styrene, initiator and solvent were uniformly mixed, and then polymerized at 75° C. and 2.2 MPa for 8 hours. The solvent was then removed by distillation under reduced pressure, and the discharged material was cooled to room temperature to obtain maleate-modified acrylic resin.

[0050] The glass transition temperature of the maleate-modified acrylic resin was measured to be 98°C.

[0051] Preparation Example 8 Maleate modified acrylic resin includes the following raw materials: 0.6 kg of maleate monomer, in this preparation example, the maleate monomer is dimethyl maleate; Butyl methacrylate 3.8 kg; Acrylic acid 2kg; Styrene 5kg; 0.3 kg of initiator. In this preparation example, di-tert-butyl peroxide is used as the initiator; 2.5 kg of solvent. In this preparation example, ethyl acetate was selected as the solvent.

[0052] The preparation method of maleate modified acrylic resin is: The maleate monomer, butyl methacrylate, acrylic acid, styrene, initiator and solvent are uniformly mixed, and then polymerized at 70°C and 1.5 MPa for 6 hours. The solvent is then removed by distillation under reduced pressure, and the discharge is cooled to room temperature to obtain maleate-modified acrylic resin.

[0053] The glass transition temperature of maleate-modified acrylic resin was measured to be 87°C. Example

[0054] Example 1 Electrochemical aluminum color coating, including the following raw materials: 12 kg of organosilicon-modified acrylic emulsion, the organosilicon-modified acrylic emulsion prepared in Preparation Example 1 is selected; 24kg water-based acrylic resin, selected from Hanhua S-60L water-based acrylic resin with a glass transition temperature of 70°C, a molecular weight of 6500, an acid value of 85mgKOH / g; 12 kg of maleate-modified acrylic resin, which is the maleate-modified acrylic resin prepared in Preparation Example 6; 1 kg of defoamer, using Evonik Surfynol DF220 water-based mineral oil defoamer; 2kg of wetting dispersant, using Digo Dispers 740W water-based acetylene glycol dispersant; 1kg of leveling agent, using Digo Glide B 1484 water-based silicone leveling agent; Water 60kg; 0.5kg of ammonia water.

[0055] The preparation method of the electrochemical aluminum color layer coating is: Put water into a reaction kettle, add water-based acrylic resin and maleic anhydride-modified acrylic resin under stirring, heat to 75° C. until the water-based acrylic resin and maleic anhydride-modified acrylic resin are completely dissolved, add ammonia water to adjust the pH value to 7.5, and obtain an aqueous solution for use; Add silicone-modified acrylic emulsion to another reaction kettle, add aqueous solution under stirring, stir for 20 minutes, then add defoamer, wetting dispersant and leveling agent, continue stirring for 1 hour until mixed, add ammonia water to adjust the pH value to 7.5, and obtain high-speed coated electrochemical aluminum color layer coating.

[0056] Example 2 Electrochemical aluminum color coating, including the following raw materials: 18 kg of organosilicon-modified acrylic emulsion, the organosilicon-modified acrylic emulsion prepared in Preparation Example 1 is selected; 30kg water-based acrylic resin, with a glass transition temperature of 70°C, a molecular weight of 6500, an acid value of 85mgKOH / g, and a model of Hanhua S-60L; 24 kg of maleate-modified acrylic resin, which is the maleate-modified acrylic resin prepared in Preparation Example 6; 3kg defoamer, using Evonik Surfynol DF-110L water-based molecular defoamer; 5kg of wetting and dispersing agent, using Sannopco SN-DISPERSANT 5040 water-based polycarboxylate dispersant; 2kg of leveling agent, using Evonik Dynol 604 acetylene glycol leveling agent; Water 90kg; 1kg of ammonia water.

[0057] The preparation method of the electrochemical aluminum color layer coating is: Put water into a reaction kettle, add water-based acrylic resin and maleic anhydride-modified acrylic resin under stirring, heat to 95° C. until the water-based acrylic resin and maleic anhydride-modified acrylic resin are completely dissolved, add ammonia water to adjust the pH value to 8.5, and obtain an aqueous solution for use; Add silicone-modified acrylic emulsion to another reaction kettle, add aqueous solution under stirring, stir for 30 minutes, then add defoamer, wetting dispersant and leveling agent, continue stirring for 1.5 hours until mixed, add ammonia water to adjust the pH value to 8.5, and obtain high-speed coated electrochemical aluminum color layer coating.

[0058] Example 3 - Implementation 6 The difference between Example 3 to Example 6 and Example 1 is that the sources of the silicone-modified acrylic emulsion and maleate-modified acrylic resin used in the raw materials are different, as shown in Table 1 for details.

[0059] Table 1 Comparative Example Comparative Example 1 The difference between this comparative example and Example 1 is that no maleate-modified acrylic resin is added to the raw materials for preparing the color layer coating of this comparative example.

[0060] Comparative Example 2 The difference between this comparative example and Example 1 is that no organosilicon-modified acrylic emulsion is added to the raw materials for preparing the color layer coating of this comparative example.

[0061] Comparative Example 3 The difference between this comparative example and Example 1 is that the raw material used for preparing the color layer coating in this comparative example is a water-based acrylic resin with a glass transition temperature of 105° C., a molecular weight of 7000, an acid value of 220 mgKOH / g, and a model of Hanhua S-70.

[0062] Performance Testing The electrochemical aluminum color layer coatings prepared in various embodiments and comparative examples of the present application were mixed with dyes to prepare different color layer slurries, wherein the color layer coating accounted for 90% and the dye accounted for 10%.

[0063] Preparation of electrochemical aluminum: 1. Preparation of each embodiment: The color layer coating of each embodiment is coated on the PET base film with a release coating by a coating machine. The release coating is made of 1.1 kg of water-based wax (20% solid content), 12 kg of pure water, and 15 kg of ethanol. The coating weight is 0.088 g / m 2 , coating speed 100m / min; The coating amount of the color layer paint is 1.1g / m 2 , coating speed 250m / min, put into oven for drying, drying parameters: 80℃ in zone 1, 120℃ in zone 2, 160℃ in zone 3, 155℃ in zone 4, 140℃ in zone 5, to obtain laser color layer; The laser color layer is molded, and the molding process is as follows: the starting temperature is 140°C, gradually increased to 175°C, and the machine speed is gradually increased from 5m / min to 50m / min; After the molding is completed, aluminum is plated on the laser color layer to form an aluminum-plated layer with an OD value of 1.2. Finally, an adhesive is applied and dried to form an adhesive layer to obtain electrochemical aluminum.

[0064] 2. Preparation of each comparative example: Different from the examples, the coating speed of the color layer coating is 80 m / min.

[0065] The electrochemical aluminum mold is tested for slitting, temperature resistance and laser effect.

[0066] Cutting property: The prepared electrochemical aluminum film was hot-stamped onto the surface of the substrate at 125°C, and the film was torn off. The substrate was packaging cardboard, and the hot-stamping pattern was a plurality of continuously laid squares. After the hot-stamping was completed, the appearance of the square boundary was observed and recorded in Table 2. The clearer the boundary, the better the cutting property.

[0067] Temperature resistance: Observe whether there is color change when hot stamping at 145℃, and the hot stamping delay is 0.4s.

[0068] Laser effect: After separating the coating layer, release layer and substrate film of the electroplated aluminum, observe the pattern clarity of the non-adherent part of the coating layer and evaluate it. Level 1 means a clear pattern with no spots, level 2 means a clear pattern with slight spots, level 3 means a slightly blurred pattern, and level 4 means a significantly blurred pattern.

[0069] Hot stamping quality: Hot stamp the prepared electrochemical aluminum film onto the surface of the substrate at 125°C. The hot stamping pattern area is a square pattern of 50mm×50mm. Observe the clarity and integrity of the pattern.

[0070] Table 2 sample Cutting Temperature resistance Laser Effect Hot stamping quality Example 1 Clear boundaries No color change Level 1 The pattern is clear and complete Example 2 Clear boundaries No color change Level 1 The pattern is clear and complete Example 3 Clear boundaries No color change Level 1 The pattern is clear and complete Example 4 Clear boundaries No color change Level 1 The pattern is clear and complete Example 5 Clear boundaries No color change Level 1 The pattern is clear and complete Example 6 Clear boundaries No color change Level 1 The pattern is clear and complete Comparative Example 1 Blurred Boundaries No color change Level 4 Blurred pattern Comparative Example 2 Blurred Boundaries Discoloration Level 2 Blurred pattern Comparative Example 3 Clear boundaries No color change Level 3 Blurred pattern According to Table 2, the combination of the silicone-modified acrylic emulsion with a high glass transition temperature and the water-based acrylic resin and water-based acrylic resin with a low glass transition temperature of the present application can accelerate the curing speed of the color layer coating, increase the coating rate to 250 m / min, and improve the production efficiency of electroplated aluminum. In addition, the color layer coating has good temperature resistance, does not change color under 145°C hot stamping, has good laser effect, has good slitting performance and hot stamping quality, and meets the needs of high-speed hot stamping.

[0071] Compared with Example 1, Comparative Examples 1-3 have changed the combination of silicone-modified acrylic emulsion and water-based acrylic resin and water-based acrylic resin, which shows that the silicone-modified acrylic emulsion provides good slitting properties and high temperature resistance, and the water-based acrylic resin and water-based acrylic resin provide appropriate molding temperature and good laser effect, making the laser pattern clear, and the three work together to achieve a good hot stamping effect.

[0072] 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 high-speed coating electrochemical aluminum color layer coating, characterized in that: The invention comprises the following raw materials in parts by weight: 12-18 parts of silicone modified acrylic emulsion; 24-30 parts of water-based acrylic resin; 12-24 parts of maleate modified acrylic resin; 1-3 parts of defoaming agent; 2-5 parts of wetting and dispersing agent; 1-2 parts of leveling agent; 60-90 parts of water; 0.5-1 part of ammonia water; The glass transition temperature of the silicone-modified acrylic emulsion is 150-180°C, the glass transition temperature of the water-based acrylic resin is 60-90°C, and the glass transition temperature of the maleic anhydride-modified acrylic resin is 80-100°C.

2. The high-speed coating electrochemical aluminum color layer coating according to claim 1, characterized in that: The organosilicon-modified acrylic emulsion is made from the following raw materials in parts by weight: Acrylic acid 5-15 parts; 10-18 parts of methyl methacrylate; Isobornyl methacrylate 5-8 parts; 3-7 parts of silicone monomer; Emulsifier 2-5 parts; 1-3 parts of initiator; 50-75 parts of deionized water.

3. The high-speed coating electrochemical aluminum color layer coating according to claim 2, characterized in that: The organic silicon monomer is selected from one or more of vinyl trimethoxy silane, methacryloxypropyl trimethoxy silane, and 4-vinyl benzylamine modified (3-glycidoxypropyl) trimethoxy silane.

4. The high-speed coating electrochemical aluminum color layer coating according to claim 3 is characterized in that: The 4-vinylbenzylamine modified (3-glycidoxypropyl) trimethoxysilane is composed of the following raw materials in parts by weight: 35-50 parts of (3-glycidoxypropyl)trimethoxysilane; 14-18 parts of 4-vinylbenzylamine; 1-3 parts of catalyst.

5. The high-speed coating electrochemical aluminum color layer coating according to claim 3 is characterized in that: The maleate-modified acrylic resin is made from the following raw materials in parts by weight: 5-7 parts of maleate monomer; Butyl methacrylate 35-40 parts; Acrylic acid 18-22 parts; 45-55 parts of styrene; 2-4 parts of initiator; 23-28 parts of solvent.

6. The high-speed coating electrochemical aluminum color layer paint according to claim 3, characterized in that: The maleate monomer includes one or more of dibutyl maleate, ethylene glycol maleate, and dimethyl maleate.

7. The high-speed coating electrochemical aluminum color layer coating according to claim 1, characterized in that: The water-based acrylic resin has a molecular weight of 6500-8000 and an acid value of 82-88 mgKOH / g.

8. A method for preparing a high-speed coating electrochemical aluminum color layer coating according to any one of claims 1 to 7, characterized in that: The steps include: Put water into a reaction kettle, add water-based acrylic resin and maleic anhydride-modified acrylic resin under stirring, heat to 75-95° C. until the water-based acrylic resin and maleic anhydride-modified acrylic resin are completely dissolved, add ammonia water to adjust the pH value to 7.5-8.5, and obtain an aqueous solution for use; Add silicone-modified acrylic emulsion to another reaction kettle, add aqueous solution under stirring, stir for 20-30 minutes, then add defoamer, wetting dispersant and leveling agent, continue stirring for 1-1.5 hours until mixed, add ammonia water to adjust the pH value to 7.5-8.5, and obtain electrochemical aluminum color layer coating.

9. The method for preparing a high-speed coating electrochemical aluminum color layer coating according to claim 8, characterized in that: The organosilicon-modified acrylic emulsion is prepared by the following steps: Take acrylic acid, methyl methacrylate, isobornyl methacrylate and silicone monomer and mix them evenly at room temperature, add them into a solution consisting of part of deionized water and part of emulsifier, stir and emulsify to obtain a pre-emulsion; heat the remaining deionized water and emulsifier to 70-80°C, add part of the pre-emulsion and part of the initiator, and keep the temperature for reaction for 20-30 minutes; add the remaining pre-emulsion and initiator dropwise at 80-84°C within 2 hours, keep the temperature for reaction for 1-2 hours, cool and filter to obtain a silicone-modified acrylic emulsion.

10. The high-speed coating electrochemical aluminum color layer paint according to claim 3, characterized in that: The maleate-modified acrylic resin is prepared by the following steps: The maleate monomer, butyl methacrylate, acrylic acid, styrene, initiator and solvent are uniformly mixed, and then polymerized at 65-75° C. and 0.8-2.2 MPa for 5-8 hours, and then the solvent is removed by reduced pressure distillation to obtain maleate modified acrylic resin.

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