Drawn aluminum-plated film and method for manufacturing the same

Abstract

The application discloses a drawing aluminum-plated film and a preparation method thereof, and belongs to the field of thin films. The drawing aluminum-plated film comprises a drawing base material, a polyurethane coating and an aluminum-plated layer arranged in sequence, the polyurethane coating is formed by curing polyurethane coating material, the polyurethane coating is subjected to plasma surface treatment, and the polyurethane coating material is compounded according to a weight ratio of 1:(0.5-1):(0.5-1) of water-based polyurethane dispersion liquid, diluent and water. The water-based polyurethane dispersion liquid is prepared from raw materials containing the following components in parts by weight: 2-8 parts of double-end hydroxypropyl polysiloxane; 15-20 parts of polyether polyol; 15-20 parts of diisocyanate; 3-6 parts of chain extender; 5-9 parts of hydroxy acrylate monomer; 2-5 parts of acrylate monomer; 1-3 parts of single-end vinyl polysiloxane; and 80-90 parts of water. The application has the advantages of improving the adhesion of the aluminum layer and improving the durability of the drawing aluminum-plated film.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of thin films, in particular to a wire-drawing aluminum-plated film and a preparation method thereof. BACKGROUND

[0002] The wire-drawing aluminum-plated film is a common decorative film, which has a metal luster and a wire-drawing texture to imitate a wire-drawing aluminum material, and thus can replace a metal plate in appearance decoration. The wire-drawing aluminum-plated film has been gradually applied to various fields of daily life, such as surface decoration of various household appliances, e.g., a television panel, a refrigerator door panel, a computer panel, etc., and has a wide range of uses in the packaging field, e.g., electronic devices, beverage bottles, cosmetics, etc. The wire-drawing aluminum-plated film can protect the product surface from being scratched or contaminated and can improve the visual effect of the product.

[0003] The substrate of the existing wire-drawing aluminum-plated film is usually PET, PVC and CPP, wherein PET is most commonly used in the wire-drawing aluminum-plated film due to its stable and durable characteristics. The PET film is first mechanically wire-drawn under the treatment of a wire-drawing device to form a wire-drawing surface on one side of the PET film, and then an aluminum layer is fixedly attached to the wire-drawing surface by vacuum aluminum plating to form the wire-drawing aluminum-plated film.

[0004] However, the wire-drawing aluminum-plated film has poor adhesion of the aluminum layer due to the insufficient contact between the aluminum layer and the substrate after the wire-drawing treatment, which affects the durability of the wire-drawing aluminum-plated film. SUMMARY

[0005] In order to improve the adhesion of the aluminum layer and the durability of the wire-drawing aluminum-plated film, the present application provides a wire-drawing aluminum-plated film and a preparation method thereof.

[0006] In a first aspect, the present application provides a wire-drawing aluminum-plated film adopting the following technical solution:

[0007] The wire-drawing aluminum-plated film comprises a wire-drawing substrate, a polyurethane coating layer and an aluminum plating layer arranged in sequence, the polyurethane coating layer is formed by curing polyurethane coating, the polyurethane coating layer is subjected to plasma surface treatment, and the polyurethane coating comprises a water-based polyurethane dispersion liquid, a diluent and water in a weight ratio of 1:(0.6-1):(0.6-1).

[0008] The water-based polyurethane dispersion liquid is prepared from raw materials comprising the following weight parts:

[0009] 2-8 parts of a double-end hydroxypropyl polysiloxane;

[0010] 15-20 parts of a polyether polyol;

[0011] 15-20 parts of a diisocyanate;

[0012] 3-6 parts of a chain extender;

[0013] Hydroxy acrylate monomer 5-9 parts;

[0014] Acrylate monomer 2-5 parts;

[0015] Single end vinyl polysiloxane 0.5-1 parts;

[0016] Water 80-90 parts.

[0017] By adopting the above technical scheme, the polyurethane coating can effectively connect the substrate and the aluminum plating layer, and further improve the adhesion of the polyurethane coating and the aluminum plating layer under the plasma surface treatment, thereby improving the adhesion between the substrate and the aluminum plating layer and the adhesion of the aluminum layer. Since the substrate is subjected to wire drawing treatment, the wire-drawing surface of the substrate is uneven, and the ordinary polyurethane coating cannot fully contact the wire-drawing surface of the substrate, which affects the improvement of the adhesion of the aluminum layer, and the adhesion of the polyurethane coating and the substrate will also decrease after long-term use, and the durability of the wire-drawing aluminum plating film is insufficiently improved.

[0018] Therefore, the double-end hydroxypropyl polysiloxane modified polyurethane prepolymer is first synthesized in the polyurethane coating, and then grafted and formed into a polysiloxane-containing polyacrylate. Not only a water-based polyurethane with strong adhesion is formed, but also the organic silicon tends to migrate to the coating surface during the film forming process. In addition, the water-based polyurethane has good flexibility, which drives the coating surface to have an inflation trend, so that the coating can better diffuse into the lines of the wire-drawing surface, thereby making the coating fully contact the wire-drawing surface and form a firm bond, indirectly improving the adhesion of the aluminum layer to the substrate, and external air or moisture is not easy to enter between the coating and the substrate during long-term use, thereby improving the durability of the wire-drawing aluminum plating film.

[0019] Optionally, the molecular weight of the double-end hydroxypropyl polysiloxane is 700-1000, and the molecular weight of the single-end vinyl polysiloxane is 12000-14000.

[0020] By adopting the above technical scheme, the polyurethane and the polyacrylate form a core-shell crosslinked structure, the double-end hydroxypropyl polysiloxane and the single-end vinyl polysiloxane are combined with the polyurethane and the polyacrylate respectively, and the molecular weight of the double-end hydroxypropyl polysiloxane and the single-end vinyl polysiloxane is adjusted, thereby ensuring the compatibility of the polyurethane and the polyacrylate, improving the flexibility and filling property of the water-based polyurethane dispersion as a whole, improving the long-term stable adhesion of the polyurethane coating and the substrate, and making the mechanical properties of the wire-drawing aluminum plating film all be at a good level, and finally improving the durability of the wire-drawing aluminum plating film.

[0021] Optionally, the polyether polyol includes one or both of polyethylene glycol and polypropylene glycol.

[0022] By adopting the above technical scheme, the ether bond of the polyethylene glycol and the polypropylene glycol is easy to rotate, and the water-based polyurethane dispersion can be improved in extensibility and flexibility by cooperation with the double-end hydroxypropyl polysiloxane.

[0023] Optionally, the diluent comprises isopropyl alcohol and ethylene glycol ethyl ether in a weight ratio of 1:(0.4-0.6).

[0024] By using the above technical solution, the two solvents with a boiling point difference greater than 40℃ are mixed as the diluent, the curing speed of the coating can be adjusted, the coating can be fully diffused into the lines of the drawing surface, and the durability of the drawing aluminum-plated film is improved.

[0025] Optionally, the diisocyanate is selected from isophorone diisocyanate.

[0026] By using the above technical solution, the isophorone diisocyanate has good light aging resistance, which helps to improve the durability of the drawing aluminum-plated film.

[0027] Optionally, the hydroxy acrylate monomer comprises one or more of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate and hydroxypropyl methacrylate; and the acrylate monomer comprises one or more of methyl acrylate, ethyl acrylate, propyl acrylate, methyl methacrylate, ethyl methacrylate and propyl methacrylate.

[0028] By using the above technical solution, the hydroxy acrylate monomer can react with the NCO group of the polyurethane prepolymer, so that the polyacrylate and the polyurethane form a core-shell crosslinked structure, and the structural stability of the water-based polyurethane is improved.

[0029] Optionally, the drawing substrate comprises a drawing surface and a non-drawing surface, the polyurethane coating is arranged on the drawing surface, and the non-drawing surface is provided with a printing coating.

[0030] By using the above technical solution, the printing coating can be a pattern or color for decoration or identification, thereby enriching the appearance of the drawing aluminum-plated film.

[0031] Optionally, the drawing substrate is a PET drawing film.

[0032] Optionally, the chain extender comprises 1,4-butanediol and 2,2-dimethylol propionic acid.

[0033] Optionally, the raw materials of the water-based polyurethane dispersion liquid further comprise:

[0034] 0.5-1 parts of a neutralizing agent;

[0035] 0.1-0.7 parts of an initiator;

[0036] 0.01-0.03 parts of a catalyst;

[0037] 5-15 parts of a viscosity regulator.

[0038] Optionally, the neutralizing agent is triethylamine.

[0039] Optionally, the initiator is dibenzoyl peroxide.

[0040] Optionally, the catalyst is dibutyltin dilaurate.

[0041] Optionally, the viscosity regulator is acetone.

[0042] In a second aspect, the application provides a preparation method of a drawn aluminum-plated film, which adopts the following technical scheme:

[0043] A preparation method of a drawn aluminum-plated film, comprising the following steps:

[0044] Mixing, stirring and obtaining a polyurethane coating by mixing an aqueous polyurethane dispersion, a diluent and water;

[0045] Coating the polyurethane coating on the drawn surface of the substrate, drying and curing to form a polyurethane coating layer;

[0046] Performing plasma surface treatment on the surface of the polyurethane coating layer, then vacuum evaporating aluminum on the surface of the polyurethane coating layer to form an aluminum-plated layer, and drying and curing to obtain a drawn aluminum-plated film.

[0047] By adopting the above technical scheme, the polyurethane coating layer is subjected to plasma surface treatment, the surface activity of the polyurethane coating layer is improved, and thus the adhesion between the aluminum layer and the polyurethane coating layer is improved.

[0048] Optionally, the preparation method of the aqueous polyurethane dispersion comprises the following steps:

[0049] Mixing the double-end hydroxypropyl polysiloxane and the polyether polyol, introducing inert gas for protection, heating to 80-90℃, adding diisocyanate and reacting for 1-1.5h, then cooling to 70-80℃, adding chain extender and reacting for 1.5-2.5h, then adding hydroxyacrylate monomer and reacting for 1-1.5h, then adding acrylate monomer and single-end vinyl polysiloxane to initiate polymerization reaction for 0.5-1h, cooling to 40-50℃, adding water, stirring and emulsifying to obtain an aqueous polyurethane dispersion.

[0050] By adopting the above technical scheme, the double-end hydroxypropyl polysiloxane modified polyurethane prepolymer is first synthesized, then the hydroxyacrylate monomer is grafted, the polyacrylate is introduced into the polyurethane structure to form a core-shell crosslinked structure, and the structure of the aqueous polyurethane is adjusted by the single-end vinyl polysiloxane to improve the diffusivity of the aqueous polyurethane, thereby sufficiently improving the adhesion between the drawn substrate and the polyurethane coating layer.

[0051] Optionally, the preparation method of the aqueous polyurethane dispersion comprises the following steps:

[0052] Mixing the double-end hydroxypropyl polysiloxane with the polyether polyol, protecting by passing inert gas, heating to 80-90℃, adding diisocyanate, reacting for 1-1.5h, then cooling to 70-80℃, adding chain extender, reacting for 2-2.5h, then adding viscosity regulator, further adding catalyst and hydroxy acrylate monomer, reacting for 1-1.5h, further adding initiator, acrylic ester monomer and single-end vinyl polysiloxane, reacting for 0.5-1h, cooling to 40-50℃, adding neutralizer, reacting for 0.2-0.5h, adding water, stirring and emulsifying to obtain the water-based polyurethane dispersion.

[0053] Optionally, the working gas in the method of plasma treatment is air, the working gas flow is 1000-1500sccm, and the power of plasma treatment is 2-3kW.

[0054] In summary, the present application has the following beneficial effects:

[0055] 1. The polyurethane coating can effectively connect the substrate and the aluminum plating layer, and further improve the adhesion of the polyurethane coating and the aluminum plating layer under plasma surface treatment. The double-end hydroxypropyl polysiloxane modified polyurethane prepolymer is first synthesized in the polyurethane coating, and then grafted and formed into a polysiloxane-containing polyacrylate. Not only a water-based polyurethane with strong adhesion is formed, but also the polysiloxane tends to migrate to the surface of the coating during the film forming process. In addition, the water-based polyurethane has good flexibility, which drives the coating surface to have an expansion trend. The coating can better diffuse into the wire lines of the drawn surface, so that the coating and the drawn surface are fully contacted and firmly combined, thereby improving the durability of the drawn aluminum plating film.

[0056] 2. The polyurethane and the polyacrylate form a core-shell crosslinked structure, the double-end hydroxypropyl polysiloxane and the single-end vinyl polysiloxane are combined with the polyurethane and the polyacrylate respectively, and the molecular weight of the double-end hydroxypropyl polysiloxane and the single-end vinyl polysiloxane is adjusted to ensure the compatibility of the polyurethane and the polyacrylate, improve the flexibility and filling property of the water-based polyurethane dispersion as a whole, and improve the long-term stable combination of the polyurethane coating and the substrate. BRIEF DESCRIPTION OF DRAWINGS

[0057] Figure 1 is a layer structure diagram of the drawn aluminum plating film of the embodiments 1-3 of the present application.

[0058] MARKS:

[0059] 1. drawn substrate; 2. polyurethane coating; 3. aluminum plating layer. DETAILED DESCRIPTION

[0060] The following will be described in detail in combination with the Figure 1 The present application will be further described in detail.

[0061] Preparation Example 1

[0062] A method for preparing an aqueous polyurethane dispersion, comprising the following steps:

[0063] The double-end hydroxypropyl polysiloxane 0.2 kg, polyether polyol 2 kg, diisocyanate 1.5 kg, chain extender 0.3 kg, hydroxy acrylate monomer 0.5 kg, acrylic ester monomer 0.2 kg, single-end vinyl polysiloxane 0.05 kg, water 8 kg, neutralizing agent 0.05 kg, initiator 0.01 kg, catalyst 1 g, viscosity modifier 0.5 kg.

[0064] The number average molecular weight of the double-end hydroxypropyl polysiloxane is 700; the polyether polyol is specifically polyethylene glycol with a number average molecular weight of 2000; the diisocyanate is specifically isophorone diisocyanate; the chain extender includes 1,4-butanediol 0.1 kg and 2,2-dimethylol propionic acid 0.2 kg, and the 2,2-dimethylol propionic acid is previously dissolved in 0.2 kg of N-methyl pyrrolidone to form a 2,2-dimethylol propionic acid solution; the hydroxy acrylate monomer is specifically hydroxyethyl methacrylate; the acrylic ester monomer is specifically methyl methacrylate; the number average molecular weight of the single-end vinyl polysiloxane is 12000; the neutralizing agent is specifically triethylamine; the initiator is specifically dibenzoyl peroxide; the catalyst is specifically dibutyltin dilaurate; and the viscosity modifier is specifically acetone.

[0065] The double-end hydroxypropyl polysiloxane is mixed with the polyether polyol, nitrogen is introduced for protection, heated to 80℃, the diisocyanate is added and reacted for 1.5h, then cooled to 70℃, 1,4-butanediol is added and reacted for 1h, then the 2,2-dimethylol propionic acid solution is added and reacted for 1.5h, then the viscosity modifier is added, stirred uniformly, and then the catalyst and the hydroxy acrylate monomer are added and reacted for 1.5h, then the initiator, the acrylic ester monomer, and the single-end vinyl polysiloxane are added and reacted for 1h, cooled to 40℃, the neutralizing agent is added and reacted for 0.5h, water is added, stirred and emulsified, the viscosity modifier is removed by rotary evaporation, and an aqueous polyurethane dispersion is obtained.

[0066] Preparation Example 2

[0067] A method for preparing an aqueous polyurethane dispersion, comprising the following steps:

[0068] The double-end hydroxypropyl polysiloxane 0.2 kg, polyether polyol 2 kg, diisocyanate 1.5 kg, chain extender 0.3 kg, hydroxy acrylate monomer 0.5 kg, acrylic ester monomer 0.2 kg, single-end vinyl polysiloxane 0.05 kg, water 8 kg, neutralizing agent 0.05 kg, initiator 0.01 kg, catalyst 1 g, viscosity modifier 0.5 kg.

[0069] The number average molecular weight of the double-end hydroxypropyl polysiloxane is 1000; the polyether polyol is specifically polyethylene glycol with a number average molecular weight of 2000; the diisocyanate is specifically isophorone diisocyanate; the chain extender includes 1,4-butanediol 0.3 kg and 2,2-dimethylol propionic acid 0.3 kg, and the 2,2-dimethylol propionic acid is previously dissolved in 0.3 kg of N-methyl pyrrolidone to form a 2,2-dimethylol propionic acid solution; the hydroxy acrylate monomer is specifically hydroxyethyl methacrylate; the acrylate monomer is specifically methyl methacrylate; the number average molecular weight of the single-end vinyl polysiloxane is 14000; the neutralizing agent is specifically triethylamine; the initiator is specifically dibenzoyl peroxide; the catalyst is specifically dibutyltin dilaurate; and the viscosity regulator is specifically acetone.

[0070] The double-end hydroxypropyl polysiloxane and the polyether polyol are mixed, nitrogen is introduced for protection, heated to 90°C, the diisocyanate is added and reacted for 1 h, then cooled to 80°C, the 1,4-butanediol is added and reacted for 0.5 h, then the 2,2-dimethylol propionic acid solution is added and reacted for 1 h, then the viscosity regulator is added, stirred uniformly, and then the catalyst and the hydroxy acrylate monomer are added and reacted for 1 h, then the initiator, the acrylate monomer and the single-end vinyl polysiloxane are added and reacted for 0.5 h, cooled to 50°C, the neutralizing agent is added and reacted for 0.2 h, water is added, stirred and emulsified, the viscosity regulator is removed by rotary evaporation, and an aqueous polyurethane dispersion is obtained.

[0071] Preparation Example 3

[0072] The preparation method of the aqueous polyurethane dispersion includes the following steps:

[0073] The double-end hydroxypropyl polysiloxane 0.4 kg, the polyether polyol 1.7 kg, the diisocyanate 1.7 kg, the chain extender 0.4 kg, the hydroxy acrylate monomer 0.6 kg, the acrylate monomer 0.3 kg, the single-end vinyl polysiloxane 0.08 kg, the water 8.5 kg, the neutralizing agent 0.07 kg, the initiator 0.03 kg, the catalyst 1.5 g, and the viscosity regulator 1 kg are weighed.

[0074] The number average molecular weight of the double-end hydroxypropyl polysiloxane is 1000; the polyether polyol is specifically polyethylene glycol with a number average molecular weight of 2000; the diisocyanate is specifically isophorone diisocyanate; the chain extender includes 1,4-butanediol 0.3 kg and 2,2-dimethylol propionic acid 0.3 kg, and the 2,2-dimethylol propionic acid is previously dissolved in 0.3 kg of N-methyl pyrrolidone to form a 2,2-dimethylol propionic acid solution; the hydroxy acrylate monomer is specifically hydroxyethyl methacrylate; the acrylate monomer is specifically methyl methacrylate; the number average molecular weight of the single-end vinyl polysiloxane is 14000; the neutralizing agent is specifically triethylamine; the initiator is specifically dibenzoyl peroxide; the catalyst is specifically dibutyltin dilaurate; and the viscosity regulator is specifically acetone.

[0075] The double-end hydroxypropyl polysiloxane is mixed with the polyether polyol, protected by nitrogen, heated to 80℃, added with diisocyanate and reacted for 1.5h, then cooled to 70℃, added with 1,4-butanediol and reacted for 1h, then added with 2,2-dimethylol propionic acid solution and reacted for 1.5h, then added with viscosity regulator, stirred uniformly, then added with catalyst and hydroxy acrylate monomer and reacted for 1.5h, then added with initiator, acrylic ester monomer and single-end vinyl polysiloxane and reacted for 1h, cooled to 40℃, added with neutralizer and reacted for 0.5h, added with water, stirred and emulsified, removed with rotary evaporation to obtain the water-based polyurethane dispersion.

[0076] Preparation Example 4

[0077] The difference between the present preparation example and Preparation Example 3 is that the number average molecular weight of the double-end hydroxypropyl polysiloxane is 1200 and the number average molecular weight of the single-end vinyl polysiloxane is 10000.

[0078] Comparative Preparation Example 1

[0079] The difference between the present comparative preparation example and Preparation Example 3 is that the double-end hydroxypropyl polysiloxane is replaced with an equal amount of polyether polyol, i.e. no double-end hydroxypropyl polysiloxane is added, and the amount of polyether polyol is 2.1kg.

[0080] Comparative Preparation Example 2

[0081] The difference between the present comparative preparation example and Preparation Example 3 is that the single-end vinyl polysiloxane is replaced with an equal amount of acrylic ester monomer, i.e. no single-end vinyl polysiloxane is added, and the amount of acrylic ester monomer is 0.38kg.

[0082] Comparative Preparation Example 3

[0083] The method for preparing the water-based polyurethane dispersion comprises the following steps:

[0084] The double-end hydroxypropyl polysiloxane 0.4kg, polyether polyol 1.7kg, diisocyanate 1.7kg, chain extender 0.4kg, water 8.5kg, neutralizer 0.07kg and viscosity regulator 1kg are weighed.

[0085] The number average molecular weight of the double-end hydroxypropyl polysiloxane is 700; the polyether polyol is specifically polyethylene glycol with a number average molecular weight of 2000; the diisocyanate is specifically isophorone diisocyanate; the chain extender includes 1,4-butanediol 0.15kg and 2,2-dimethylol propionic acid 0.25kg, and the 2,2-dimethylol propionic acid is previously dissolved in 0.25kg N-methyl pyrrolidone to form a 2,2-dimethylol propionic acid solution; the neutralizer is specifically triethylamine; and the viscosity regulator is specifically acetone.

[0086] Mixing the double-end hydroxypropyl polysiloxane with the polyether polyol, protecting by passing nitrogen, heating to 80℃, adding diisocyanate and reacting for 1.5h, then cooling to 70℃, adding 1,4-butanediol and reacting for 1h, then adding 2,2-dimethylol propionic acid solution and reacting for 1.5h, then adding viscosity regulator, cooling to 40℃, adding neutralizer and reacting for 0.5h, adding water, stirring and emulsifying, removing the viscosity regulator by rotary evaporation, to obtain the aqueous polyurethane dispersion.

[0087] Example 1

[0088] A drawn aluminum-plated film, as shown in Figure 1 , comprises a drawn substrate 1, a polyurethane coating layer 2 and an aluminum-plated layer 3 arranged in sequence.

[0089] The drawn substrate is a PET drawn film with a thickness of 45μm.

[0090] A method for preparing a drawn aluminum-plated film, comprising the following steps:

[0091] Take 10kg of the aqueous polyurethane dispersion, 6kg of diluent and 6kg of water.

[0092] The aqueous polyurethane dispersion is prepared by the preparation example 1; the diluent is specifically isopropyl alcohol.

[0093] Mix the aqueous polyurethane dispersion, the diluent and the water and stir to obtain a polyurethane coating.

[0094] Coat the polyurethane coating on one side of the PET drawn film at a coating amount of 0.82g / m 2 , then convey the PET drawn film into a drying tunnel for drying and curing, the drying tunnel is divided into seven sections, the temperature of each section is 90℃, 110℃, 120℃, 120℃, 130℃, 120℃ and 105℃ in sequence, the length of the drying tunnel is 10m, the conveying speed is 60m / min, to form a polyurethane coating layer with a thickness of 0.08μm.

[0095] Perform plasma treatment on the surface of the polyurethane coating layer in a glow discharge mode, the working gas in the method for plasma treatment is air, the working gas flow is 1000sccm, and the power for plasma treatment is 2kW.

[0096] Finally, convey into a vacuum evaporation device to perform vacuum evaporation of aluminum on the surface of the polyurethane coating layer, during the vacuum evaporation process, the plating speed of aluminum is 3.9m / s, the temperature of the heated aluminum wire is 1400℃, and the wire feeding speed of the aluminum wire is 700mm / min, to form an aluminum-plated layer with a thickness of 450 angstroms, then dry and cure in a 60℃ oven for 72h, to obtain the drawn aluminum-plated film.

[0097] Example 2

[0098] The difference between this embodiment and embodiment 1 is that the preparation method of the drawn aluminized film is different.

[0099] The water-based polyurethane dispersion liquid 10 kg, diluent 10 kg, water 10 kg were weighed.

[0100] The water-based polyurethane dispersion liquid was prepared by preparation example 2, and the diluent was isopropyl alcohol.

[0101] The water-based polyurethane dispersion liquid, diluent and water were mixed and stirred to obtain a polyurethane coating.

[0102] The polyurethane coating was coated on one side of the PET drawn film, and the coating amount was 0.94 g / m 2 Then the PET drawn film was conveyed into the oven for drying and curing, the oven was divided into seven sections, and the temperature of each section was 90℃, 110℃, 120℃, 120℃, 130℃, 120℃ and 105℃ respectively, the length of the oven was 10 m, and the conveying speed was 60 m / min, forming a polyurethane coating with a thickness of 0.08 μm.

[0103] The surface of the polyurethane coating was subjected to plasma treatment by glow discharge method, the working gas in the method of plasma treatment was air, the flow rate of the working gas was 1500 sccm, and the power of the plasma treatment was 3 kW.

[0104] Finally, it was sent into a vacuum evaporation device to perform vacuum evaporation of aluminum on the surface of the polyurethane coating, during the vacuum evaporation process, the evaporation speed of aluminum was 3.9 m / s, the temperature of the heated aluminum wire was 1400℃, the wire feeding speed of the aluminum wire was 700 mm / min, a 450 angstrom thick aluminum coating was formed, and then it was dried and cured in a 60℃ oven for 72 h to obtain a drawn aluminized film.

[0105] Example 3

[0106] The difference between this embodiment and embodiment 1 is that the composition of the polyurethane coating is different.

[0107] The composition of the polyurethane coating was: water-based polyurethane dispersion liquid 10 kg, diluent 8 kg, water 8 kg.

[0108] The water-based polyurethane dispersion liquid was prepared by preparation example 3, and the diluent was isopropyl alcohol.

[0109] The coating amount of the polyurethane coating was 0.89 g / m 2 .

[0110] Example 4

[0111] The difference between this embodiment and embodiment 3 is that the composition of the water-based polyurethane dispersion liquid is different.

[0112] The water-based polyurethane dispersion liquid was prepared by preparation example 4.

[0113] Example 5

[0114] The difference between this example and Example 3 is the composition of the diluent.

[0115] The diluent is a mixture of isopropyl alcohol and ethylene glycol ethyl ether in a weight ratio of 1:0.4.

[0116] Example 6

[0117] The difference between this example and Example 3 is the composition of the diluent.

[0118] The diluent is a mixture of isopropyl alcohol and ethylene glycol ethyl ether in a weight ratio of 1:0.6.

[0119] Example 7

[0120] The difference between this example and Example 3 is that the non-drawing side of the drawn aluminum-plated film is further provided with a printed coating.

[0121] After the step of preparing the drawn aluminum-plated film, a UV printing paint is applied to the non-drawing side of the drawn aluminum-plated film, and UV curing is performed, finally forming a pattern and color on the drawn aluminum-plated film.

[0122] Comparative Example 1

[0123] The difference between this comparative example and Example 3 is the composition of the aqueous polyurethane dispersion.

[0124] The aqueous polyurethane dispersion is prepared according to Comparative Preparation Example 1.

[0125] Comparative Example 2

[0126] The difference between this comparative example and Example 3 is the composition of the aqueous polyurethane dispersion.

[0127] The aqueous polyurethane dispersion is prepared according to Comparative Preparation Example 2.

[0128] Comparative Example 3

[0129] The difference between this comparative example and Example 3 is the composition of the aqueous polyurethane dispersion.

[0130] The aqueous polyurethane dispersion is prepared according to Comparative Preparation Example 3.

[0131] Comparative Example 4

[0132] The method for preparing a drawn aluminum-plated film comprises the following steps:

[0133] The drawing surface of the PET drawing film is subjected to plasma treatment in a glow discharge mode, the working gas in the plasma treatment method is air, the working gas flow is 1000 sccm, and the plasma treatment power is 2 kW.

[0134] Finally, the drawing surface is subjected to vacuum evaporation of aluminum in a vacuum evaporation device, in the vacuum evaporation process, the aluminum plating speed is 3.9 m / s, the temperature of the heated aluminum wire is 1400 °C, the wire feeding speed of the aluminum wire is 700 mm / min, an aluminum plating layer with a thickness of 450 angstroms is formed, and then the drawing plating aluminum film is prepared by drying and curing in a 60 °C oven for 72 h.

[0135] Performance test

[0136] The drawing plating aluminum films prepared in Examples 1-6 and Comparative Examples 1-4 are subjected to the following tests.

[0137] Aluminum plating layer adhesion: referring to QB / T 2358-1998 "Plastic film packaging bag heat sealing strength test method", the heat sealing layer of the EAA film is heat sealed with the aluminum plating layer of the drawing plating aluminum film, the heat sealing temperature is 125 °C, the pressure is 0.25 MPa, the heat sealing time is 1.8 s, then the aluminum plating layer is peeled off from the drawing plating aluminum film by using a tensile testing machine to obtain the adhesion data, and the results are shown in Table 1.

[0138] Adhesion durability: the drawing plating aluminum film is also placed in a test box at 120 °C and 85% humidity for aging for 240 h, and then the adhesion of the aluminum plating layer is tested, and the results are shown in Table 1.

[0139] Table 1

[0140] adhesion (N / 15 mm) adhesion after aging (N / 15 mm) Example 1 3.5 2.8 Example 2 3.2 2.6 Example 3 3.7 3.0 Example 4 3.3 2.3 Example 5 3.6 3.2 Example 6 3.8 3.4 Comparative Example 1 2.9 1.5 Comparative Example 2 2.8 1.5 Comparative Example 3 2.5 1.1 Comparative Example 4 1.3 0.5

[0141] As can be seen from Table 1, the drawing plating aluminum films prepared in Examples 1-3 all have high adhesion of the aluminum plating layer, and the adhesion of the aluminum plating layer can still be maintained at a high level after aging at high temperature and high humidity, so the durability is good.

[0142] Compared with Comparative Examples 3-4, the mechanical properties of Example 3 are all better than those of Comparative Examples 3-4, and further combined with Table 1, it can be seen that the advantages of Example 3 in adhesion are more obvious. It is proved that compared with directly evaporating the aluminum plating layer on the drawing surface, forming a polyurethane coating layer on the drawing surface can help to improve the bonding force between the drawing substrate and the aluminum plating layer, and the cross-linked structure of polyurethane and polyacrylate can help to improve the durability of the drawing plating aluminum film.

[0143] Compared with Comparative Example 1-2, it can be seen that the advantage of Example 3 in the durability of the adhesion of the aluminum plating layer is obvious, which proves that the waterborne polyurethane dispersion liquid modified by the multi-step organic silicon can fully spread to the surface of the drawn substrate, reduce the interference of external air or water vapor between the coating and the substrate, thereby improving the continuous adhesion of the aluminum plating layer.

[0144] Compared with Example 4, the advantage of Example 3 in the durability of the adhesion of the aluminum plating layer is also obvious, which proves that the synergistic cooperation of the two kinds of double-end hydroxypropyl polysiloxane and single-end vinyl polysiloxane helps to improve the continuous combination between the coating and the substrate.

[0145] The aluminum plating layer adhesion durability of Examples 5-6 is higher than that of Example 3, which proves that by adjusting the composition of the diluent, the curing speed of the coating can be adjusted, the diffusivity of the waterborne polyurethane dispersion liquid can be fully utilized, and the durability of the drawn aluminum plating film can be improved.

[0146] The specific embodiment is only an explanation of the present application, which is not a limitation of the present application. Those skilled in the art can make modifications to the specific embodiment without creative contribution after reading the present specification, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A drawn and iridized film, characterized in that: The drawing film comprises a drawing base material, a polyurethane coating layer and an aluminum plating layer which are sequentially arranged, the polyurethane coating layer is formed by curing polyurethane coating, the polyurethane coating layer is subjected to plasma surface treatment, and the polyurethane coating comprises an aqueous polyurethane dispersion, a diluent and water in a weight ratio of 1:(0.6-1):(0.6-1). The aqueous polyurethane dispersion is prepared from raw materials comprising the following weight parts: a double-end hydroxypropyl polysiloxane 2-8 parts; a polyether polyol 15-20 parts; a diisocyanate 15-20 parts; a chain extender 3-6 parts; a hydroxy acrylate monomer 5-9 parts; an acrylate monomer 2-5 parts; a single-end vinyl polysiloxane 0.5-1 part; water 80-90 parts; the double-end hydroxypropyl polysiloxane has a molecular weight of 700-1000, and the single-end vinyl polysiloxane has a molecular weight of 12000-15000; a preparation method of the aqueous polyurethane dispersion, comprising the following steps: the double-end hydroxypropyl polysiloxane is mixed with the polyether polyol, inert gas is introduced for protection, heating is performed to 80-90℃, the diisocyanate is added and reacted for 1-1.5h, then the temperature is lowered to 70-80℃, the chain extender is added and reacted for 1.5-2.5h, then the hydroxy acrylate monomer is added and reacted for 1-1.5h, the acrylate monomer and the single-end vinyl polysiloxane are added to initiate polymerization for 0.5-1h, the temperature is lowered to 40-50℃, and the water is added, stirred and emulsified to obtain the aqueous polyurethane dispersion.

2. The drawn aluminized film according to claim 1, wherein: The polyether polyol comprises one or both of polyethylene glycol and polypropylene glycol.

3. The drawn aluminized film according to claim 1, wherein: The diluent comprises isopropyl alcohol and ethylene glycol ethyl ether in a weight ratio of 1:(0.4-0.6).

4. The drawn aluminized film according to claim 1, wherein: The diisocyanate is selected from isophorone diisocyanate.

5. The drawn aluminized film according to claim 1, wherein: The hydroxy acrylate monomer comprises one or more of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate and hydroxypropyl methacrylate; and the acrylate monomer comprises one or more of methyl acrylate, ethyl acrylate, propyl acrylate, methyl methacrylate, ethyl methacrylate and propyl methacrylate.

6. The drawn aluminized film according to any one of claims 1 to 5, wherein: The drawing film substrate comprises a drawing surface and a non-drawing surface, the polyurethane coating layer is arranged on the drawing surface, and the non-drawing surface is provided with a printing coating layer.

7. A method for preparing a wire-drawn aluminum-coated film according to any one of claims 1-6, characterized in that: The method comprises the following steps: mixing and stirring the aqueous polyurethane dispersion, the diluent and the water to obtain polyurethane coating; applying the polyurethane coating on the drawing surface of the substrate, and drying and curing to form a polyurethane coating layer; subjecting the surface of the polyurethane coating layer to plasma surface treatment, then vacuum evaporating aluminum on the surface of the polyurethane coating layer to form an aluminum plating layer, and drying and curing to obtain a drawing aluminum plating film.

8. The method for preparing a wire-drawn aluminum-plated film according to claim 7, characterized in that: In the method of plasma treatment, the working gas is air, the working gas flow is 1000-1500sccm, and the power of plasma treatment is 2-3kW.

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