A pet mirror film and a method for manufacturing the same

Abstract

The application discloses a PET mirror film and a preparation method thereof, and belongs to the technical field of PET films.The preparation method of the PET mirror film comprises the following steps: (1) providing a first PET film and a second PET film; (2) performing plasma surface treatment on the first PET film, and performing electroplating on the first PET film to form an electroplating layer; (3) coating a coloring liquid on the surface of the electroplating layer to form a coloring layer; (4) performing plasma surface treatment on the coloring layer, placing the second PET film on the surface of the coloring layer, and then performing plasma surface treatment on the second PET film; and (5) coating a scratch-resistant coating on the surface of the second PET film to form a scratch-resistant layer.The PET mirror film has excellent wear resistance, scratch resistance and aging resistance, and has a wide application prospect.

Description

Technical Field

[0001] This invention relates to the field of PET film technology, and specifically to a PET mirror film and its preparation method. Background Technology

[0002] Early mirror finishes had limited substrate options and generally poor performance. With the continuous advancement of materials science, plastic films such as PET (polyethylene terephthalate) and PC (polycarbonate) have been widely used as substrates. Traditional mirrors are usually made of glass, which is fragile, heavy, inconvenient to transport and install, and glass mirrors are expensive and can easily cause injury if broken, posing a safety hazard.

[0003] In architectural decoration, people have increasingly higher demands for the aesthetics and uniqueness of interior decoration. Mirror decorative films can simulate a mirror effect, adding brightness and spaciousness to architectural spaces. In home decoration, mirror decorative films can be used to decorate the surfaces of furniture, cabinets, and appliances, adding a sense of fashion and modernity to the environment. However, existing PET films lack sufficient wear resistance and scratch resistance. Over long-term use, due to frequent touching and wiping, the surface will gradually wear down, leading to a decrease in reflectivity, a deterioration of the mirror effect, and a relatively short service life.

[0004] Therefore, this application is submitted. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a PET mirror film and its preparation method. The PET mirror film of this invention has excellent wear resistance, scratch resistance and aging resistance, and has broad application prospects.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A method for preparing a PET mirror film includes the following steps:

[0008] (1) Provide a first PET film and a second PET film;

[0009] (2) The first PET film is subjected to plasma surface treatment, and the first PET film is electroplated to form an electroplated layer;

[0010] (3) Apply the coloring liquid to the surface of the electroplated layer to form a coloring layer;

[0011] (4) Perform plasma surface treatment on the coloring layer, place the second PET film on the surface of the coloring layer, and then perform plasma surface treatment on the second PET film.

[0012] (5) Apply an anti-scratch coating to the surface of the second PET film to form an anti-scratch layer.

[0013] The PET mirror film of this application is a multi-layered film with high gloss and reflectivity, providing a mirror-like high reflectivity effect, giving the product surface a unique visual appeal, enhancing the product's aesthetics, and meeting the demand for a high-end, fashionable appearance. It has excellent flatness and uniformity, ensuring a smooth and even product surface without obvious unevenness or defects, making the reflective effect more uniform. Simultaneously, the PET mirror film of this invention has excellent wear resistance, scratch resistance, and aging resistance, effectively preventing scratches and wear on the product surface, extending the product's service life, and providing a certain degree of resistance to common chemical substances. It can also prevent the intrusion of moisture and humidity, protecting the product's internal structure from damage.

[0014] Due to the characteristics of PET material, the PET mirror film described in this invention will not break into sharp fragments even when subjected to external impact, thus avoiding the risk of injury.

[0015] In a preferred embodiment of the present invention, the power of the plasma surface treatment is 100-300W and the time is 1-4min.

[0016] In a preferred embodiment of the present invention, the electroplating layer is aluminum, silver, copper, chromium or zinc; the thickness of the electroplating layer is 10-20 nm.

[0017] In a preferred embodiment of the present invention, the thickness of the coloring layer is 0.5 to 1.2 μm.

[0018] As a preferred embodiment of the present invention, the coloring liquid comprises the following components in parts by weight: 50-70 parts acrylic resin, 10-30 parts first solvent, 0.1-0.5 parts leveling agent, 0.1-0.3 parts antioxidant, 1-2 parts isophorone diisocyanate, and 3-5 parts color paste.

[0019] In a preferred embodiment of the present invention, the antioxidant includes at least one of antioxidant 1010, antioxidant 1086, and antioxidant 1076.

[0020] As a preferred embodiment of the present invention, the leveling agent includes at least one of acrylated polysiloxane, polyether-modified polysiloxane, polysiloxane-polyether copolymer, and polysiloxane.

[0021] As a preferred embodiment of the present invention, the first solvent includes at least one of water, ethylene glycol butyl ether, ethyl acetate, butyl acetate, diethylene glycol ethyl ether, butanone, diisobutyl ketone, and N,N-dimethylformamide.

[0022] It should be noted that the present invention does not limit the preparation method of the coloring liquid. Those skilled in the art can prepare the coloring liquid according to the formula of the present invention using conventional technical means in the field, such as mixing the raw materials evenly according to the ratio to obtain the coloring liquid.

[0023] As a preferred embodiment of the present invention, the anti-scratch coating comprises the following components in parts by weight: 45-55 parts hydroxyl acrylic resin, 6-12 parts cashew nut shell oil bio-based polyol, 9-12 parts modified needle-shaped wollastonite powder, 2-5 parts polyvinyl alcohol, 2-4 parts isophorone diisocyanate, 0.2-0.6 parts defoamer, 0.1-0.2 parts catalyst, 0.5-1.2 parts titanium dioxide, and 15-25 parts second solvent.

[0024] This invention creatively uses hydroxyl acrylic resin as a matrix, exhibiting excellent gloss and weather resistance. Cashew nutshell oil bio-based polyol, hydroxyl acrylic resin, and isophorone diisocyanate form a three-dimensional cross-linked network structure. The introduction of cashew nutshell oil bio-based polyol not only improves the coating's scratch resistance but also prevents cracking under impact or scratches by providing flexibility. Simultaneously, the natural phenolic components in cashew nutshell oil enhance the coating's UV resistance, thereby improving its aging resistance. Furthermore, the modified needle-like wollastonite powder, rich in functional groups, can uniformly disperse within the three-dimensional cross-linked network structure, interpenetrating and participating in its formation to create a unique filled network structure. This special cross-linked network structure and unique filled network structure effectively improve the abrasion resistance, scratch resistance, and aging resistance of the PET mirror film.

[0025] In a preferred embodiment of the present invention, the second solvent includes at least one of water, ethylene glycol butyl ether, ethyl acetate, butyl acetate, diethylene glycol ethyl ether, butanone, diisobutyl ketone, and N,N-dimethylformamide.

[0026] In a preferred embodiment of the present invention, the defoamer includes at least one of tributyl phosphate, trimethylsiloxane, polyether, polyacrylate, and silicone resin.

[0027] In a preferred embodiment of the present invention, the catalyst includes at least one of dibutyltin dilaurate, dibutyltin diacetate, and stannous octoate.

[0028] As a preferred embodiment of the present invention, the cashew nut shell oil bio-based polyol has a hydroxyl value of 224-256 mgKOH / g and a viscosity of 1200-1710 mPa·s at 25°C.

[0029] As a preferred embodiment of the present invention, the hydroxyl acrylic resin has a solid content of 44-46 wt%, a viscosity of 1000-4000 mPa·s at 25°C, a hydroxyl content of 2-2.5 wt%, and a glass transition temperature of 40-50°C.

[0030] As a preferred embodiment of the present invention, the method for preparing the modified needle-shaped wollastonite powder is as follows:

[0031] (1) Add 10 parts by weight of needle-shaped wollastonite powder, 0.8-1.2 parts by weight of stearic acid, 0.4-0.8 parts by weight of oleic acid, and 6-12 parts by weight of anhydrous ethanol to 25-40 parts by weight of water, stir evenly at 70-85°C, then add 0.2-0.6 parts by weight of sorbitan monostearate, stir evenly to obtain the precursor solution;

[0032] (2) Add 10 parts by weight of amino silicone oil, 6-8 parts by weight of sodium N-oleoyl-N-methyltaurate, and 4-6 parts by weight of dopamine hydrochloride to 30-50 parts by weight of water, stir evenly, then add 0.8-1.5 parts by weight of tris(hydroxymethyl)aminomethane hydrochloride buffer solution, stir evenly, and obtain the modified solution.

[0033] (3) Add 2 to 5 parts by weight of the modified liquid to 10 parts by weight of the precursor liquid, stir evenly at 70 to 85°C, filter, and dry to obtain modified needle-shaped wollastonite powder.

[0034] This invention first treats acicular wollastonite powder with stearic acid and oleic acid in anhydrous ethanol aqueous solution. Stearic acid and oleic acid have long-chain hydrocarbon groups, which can form a hydrophobic film on the surface of acicular wollastonite powder, increasing its hydrophobicity. Through the reaction with the groups of acicular wollastonite powder, the surface properties of wollastonite can be changed, giving it better wettability and oleophilicity, thereby effectively improving its dispersion performance in anti-scratch coatings and avoiding agglomeration. Sorbitan monostearate can further improve the dispersibility of wollastonite powder and form a good interface in the coating, thereby making the filler and resin more compatible. Then, a mixture of amino silicone oil, sodium N-oleoyl-N-methyltaurate, dopamine hydrochloride, and tris(hydroxymethyl)aminomethane hydrochloride buffer solution was used as a modifying liquid. By enhancing the surface chemical activity and interfacial affinity of needle-shaped wollastonite powder, the dispersibility of the modified wollastonite in the coating was greatly improved. Moreover, the modified wollastonite surface has better chemical affinity, which can better form a cross-linking network with the resin matrix and participate in the formation of the cross-linking network structure, thereby forming a unique filled network structure. By utilizing the special cross-linking network structure and the unique filled network structure, the wear resistance, scratch resistance, and aging resistance of PET mirror film are effectively improved.

[0035] In a preferred embodiment of the present invention, the particle size of the needle-shaped wollastonite powder is 200-1000 mesh.

[0036] It should be noted that the present invention does not limit the preparation method of the anti-scratch coating. Those skilled in the art can prepare the anti-scratch coating according to the formula of the present invention using conventional technical means in the field. For example, the anti-scratch coating can be obtained by mixing the raw materials evenly according to the ratio.

[0037] In a preferred embodiment of the present invention, the thickness of the scratch-resistant layer is 2 to 6 μm.

[0038] In a preferred embodiment of the present invention, the thickness of the first PET film is 8 to 50 μm.

[0039] In a preferred embodiment of the present invention, the thickness of the second PET film is 8 to 50 μm.

[0040] The beneficial effects of this invention are as follows: The PET mirror film of this application is a multilayer film with high gloss and reflectivity, which can provide a high reflective effect like a mirror, giving the product surface a unique visual appeal, enhancing the product's aesthetics, and meeting the demand for a high-end and fashionable appearance. It has excellent flatness and uniformity, ensuring that the product surface is flat and smooth, without obvious unevenness or defects, making the reflection effect more uniform and consistent. At the same time, the PET mirror film of this invention has excellent wear resistance, scratch resistance and aging resistance, which can effectively prevent the product surface from being scratched and worn, extend the product's service life, and has a certain resistance to common chemical substances. It can prevent the intrusion of moisture and humidity, protecting the product's interior from damage. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] In this application, the technical features described in an open-ended manner include both closed technical solutions consisting of the listed features and open technical solutions that include the listed features.

[0043] In this application, numerical ranges are referred to as continuous unless otherwise specified, and include the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.

[0044] In this application, there are no particular restrictions on the specific dispersion and mixing methods.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0046] Unless otherwise specified, all components, raw materials, or instruments used in the embodiments and comparative examples of this invention are commercially available, and the same type of components and raw materials are used in each parallel experiment.

[0047] The raw materials used in the examples and comparative examples are as follows:

[0048] Solvent: Diethylene glycol monobutyl ether.

[0049] Antioxidant: Antioxidant 1010.

[0050] Leveling agent: BYK 347.

[0051] Defoamer: BYK028.

[0052] Catalyst: Dibutyltin dilaurate.

[0053] Acrylic resin: Dow AC-261P.

[0054] Hydroxy acrylic resin: It has a solid content of 45 wt%, a viscosity of 1000–4000 mPa·s at 25°C, a hydroxyl content of 2.2 wt%, and a glass transition temperature of 45°C.

[0055] Cashew nut shell oil bio-based polyol-1: FX-9011, with a hydroxyl value of 224 mg KOH / g and a viscosity of 1710 mPa·s at 25℃.

[0056] Cashew nut shell oil bio-based polyol-2: FX-9014, with a hydroxyl value of 256 mg KOH / g and a viscosity of 1200 mPa·s at 25°C.

[0057] Cashew nut shell oil bio-based polyol-3: FX-9001LV, with a hydroxyl value of 175 mg KOH / g and a viscosity of 1000 mPa·s at 25°C.

[0058] Cashew nut shell oil bio-based polyol-4: FX-9008, with a hydroxyl value of 320 mg KOH / g and a viscosity of 3000 mPa·s at 25°C.

[0059] Tris(hydroxymethyl)aminomethane hydrochloride buffer: pH 7.2.

[0060] Amino silicone oil: TP-585C, with a viscosity of 500-1000 mPa·s at 25℃.

[0061] Needle-shaped wollastonite powder: 600 mesh, Siyuan Mining.

[0062] Example 1

[0063] A method for preparing a PET mirror film includes the following steps:

[0064] (1) Provide two PET films with a thickness of 20μm (divided into a first PET film and a second PET film);

[0065] (2) The first PET film was placed in the reaction chamber of the low-temperature plasma treatment instrument, and nitrogen gas was introduced at a flow rate of 50 sccm and treated with a power of 200W for 3 minutes.

[0066] The first PET film is electroplated with aluminum to form an electroplated aluminum layer with a thickness of 20 nm;

[0067] (3) Apply the coloring liquid to the surface of the electroplated layer to form a coloring layer with a thickness of 1μm;

[0068] The color liquid comprises the following components in parts by weight: 60 parts acrylic resin, 20 parts solvent, 0.4 parts leveling agent, 0.2 parts antioxidant, 1.5 parts isophorone diisocyanate, and 4 parts color paste.

[0069] (4) Place it in the reaction chamber of the low-temperature plasma treatment instrument, introduce nitrogen gas at a flow rate of 50 sccm, and treat it with a power of 200W for 3 minutes.

[0070] The second PET film was placed on the surface of the colored layer and then placed in the reaction chamber of the low-temperature plasma treatment instrument. Nitrogen gas was introduced at a flow rate of 50 sccm and treated with a power of 200W for 3 minutes.

[0071] (5) Apply an anti-scratch coating to the surface of the second PET film to form an anti-scratch layer with a thickness of 5 μm.

[0072] The anti-scratch coating comprises the following components in parts by weight: 50 parts hydroxyl acrylic resin, 10 parts cashew nut shell oil bio-based polyol-1, 10 parts modified needle-shaped wollastonite powder, 4 parts polyvinyl alcohol (PVA-1000), 3 parts isophorone diisocyanate, 0.5 parts defoamer, 0.2 parts catalyst, 1 part titanium dioxide, and 20 parts solvent.

[0073] The method for preparing the modified needle-shaped wollastonite powder is as follows:

[0074] (1) Add 10 parts by weight of needle-shaped wollastonite powder with a particle size of 600 mesh, 1 part by weight of stearic acid, 0.5 parts by weight of oleic acid and 10 parts by weight of anhydrous ethanol to 28.5 parts by weight of water, stir evenly at 100 rpm at 80°C, then add 0.5 parts by weight of sorbitan monostearate, stir evenly at 100 rpm to obtain the precursor solution;

[0075] (2) Add 10 parts by weight of amino silicone oil, 6 parts by weight of sodium N-oleoyl-N-methyltaurate and 6 parts by weight of dopamine hydrochloride to 38 parts by weight of water, stir evenly at 100 rpm, then add 1 part by weight of tris(hydroxymethyl)aminomethane hydrochloride buffer, stir evenly to obtain the modified solution.

[0076] (3) Add 4 parts by weight of the modified liquid to 10 parts by weight of the precursor liquid, stir evenly at 100 rpm at 80°C, filter, and dry at 90°C to obtain modified needle-shaped wollastonite powder.

[0077] Example 2

[0078] A method for preparing a PET mirror film includes the following steps:

[0079] (1) Provide two PET films with a thickness of 20μm (divided into a first PET film and a second PET film);

[0080] (2) The first PET film was placed in the reaction chamber of the low-temperature plasma treatment instrument, and nitrogen gas was introduced at a flow rate of 50 sccm and treated with a power of 200W for 3 minutes.

[0081] The first PET film is electroplated with aluminum to form an electroplated aluminum layer with a thickness of 20 nm;

[0082] (3) Apply the coloring liquid to the surface of the electroplated layer to form a coloring layer with a thickness of 1μm;

[0083] The color liquid comprises the following components in parts by weight: 60 parts acrylic resin, 20 parts solvent, 0.4 parts leveling agent, 0.2 parts antioxidant, 1.5 parts isophorone diisocyanate, and 4 parts color paste.

[0084] (4) Place it in the reaction chamber of the low-temperature plasma treatment instrument, introduce nitrogen gas at a flow rate of 50 sccm, and treat it with a power of 200W for 3 minutes.

[0085] The second PET film was placed on the surface of the colored layer and then placed in the reaction chamber of the low-temperature plasma treatment instrument. Nitrogen gas was introduced at a flow rate of 50 sccm and treated with a power of 200W for 3 minutes.

[0086] (5) Apply an anti-scratch coating to the surface of the second PET film to form an anti-scratch layer with a thickness of 5 μm.

[0087] The scratch-resistant coating comprises the following components in parts by weight: 45 parts hydroxyl acrylic resin, 12 parts cashew nut shell oil bio-based polyol-1, 9 parts modified needle-shaped wollastonite powder, 5 parts polyvinyl alcohol (PVA-1000), 2 parts isophorone diisocyanate, 0.6 parts defoamer, 0.1 parts catalyst, 1.2 parts titanium dioxide, and 15 parts solvent.

[0088] The method for preparing the modified needle-shaped wollastonite powder is as follows:

[0089] (1) Add 10 parts by weight of needle-shaped wollastonite powder with a particle size of 600 mesh, 1 part by weight of stearic acid, 0.5 parts by weight of oleic acid and 10 parts by weight of anhydrous ethanol to 28.5 parts by weight of water, stir evenly at 100 rpm at 80°C, then add 0.5 parts by weight of sorbitan monostearate, stir evenly at 100 rpm to obtain the precursor solution;

[0090] (2) Add 10 parts by weight of amino silicone oil, 6 parts by weight of sodium N-oleoyl-N-methyltaurate and 6 parts by weight of dopamine hydrochloride to 38 parts by weight of water, stir evenly at 100 rpm, then add 1 part by weight of tris(hydroxymethyl)aminomethane hydrochloride buffer, stir evenly to obtain the modified solution.

[0091] (3) Add 4 parts by weight of the modified liquid to 10 parts by weight of the precursor liquid, stir evenly at 100 rpm at 80°C, filter, and dry at 90°C to obtain modified needle-shaped wollastonite powder.

[0092] Example 3

[0093] A method for preparing a PET mirror film includes the following steps:

[0094] (1) Provide two PET films with a thickness of 20μm (divided into a first PET film and a second PET film);

[0095] (2) The first PET film was placed in the reaction chamber of the low-temperature plasma treatment instrument, and nitrogen gas was introduced at a flow rate of 50 sccm and treated with a power of 200W for 3 minutes.

[0096] The first PET film is electroplated with aluminum to form an electroplated aluminum layer with a thickness of 20 nm;

[0097] (3) Apply the coloring liquid to the surface of the electroplated layer to form a coloring layer with a thickness of 1μm;

[0098] The color liquid comprises the following components in parts by weight: 60 parts acrylic resin, 20 parts solvent, 0.4 parts leveling agent, 0.2 parts antioxidant, 1.5 parts isophorone diisocyanate, and 4 parts color paste.

[0099] (4) Place it in the reaction chamber of the low-temperature plasma treatment instrument, introduce nitrogen gas at a flow rate of 50 sccm, and treat it with a power of 200W for 3 minutes.

[0100] The second PET film was placed on the surface of the colored layer and then placed in the reaction chamber of the low-temperature plasma treatment instrument. Nitrogen gas was introduced at a flow rate of 50 sccm and treated with a power of 200W for 3 minutes.

[0101] (5) Apply an anti-scratch coating to the surface of the second PET film to form an anti-scratch layer with a thickness of 5 μm.

[0102] The scratch-resistant coating comprises the following components in parts by weight: 55 parts hydroxyl acrylic resin, 6 parts cashew nut shell oil bio-based polyol-1, 12 parts modified needle-shaped wollastonite powder, 2 parts polyvinyl alcohol (PVA-1000), 4 parts isophorone diisocyanate, 0.2 parts defoamer, 0.2 parts catalyst, 0.5 parts titanium dioxide, and 25 parts solvent.

[0103] The method for preparing the modified needle-shaped wollastonite powder is as follows:

[0104] (1) Add 10 parts by weight of needle-shaped wollastonite powder with a particle size of 600 mesh, 1 part by weight of stearic acid, 0.5 parts by weight of oleic acid and 10 parts by weight of anhydrous ethanol to 28.5 parts by weight of water, stir evenly at 100 rpm at 80°C, then add 0.5 parts by weight of sorbitan monostearate, stir evenly at 100 rpm to obtain the precursor solution;

[0105] (2) Add 10 parts by weight of amino silicone oil, 6 parts by weight of sodium N-oleoyl-N-methyltaurate and 6 parts by weight of dopamine hydrochloride to 38 parts by weight of water, stir evenly at 100 rpm, then add 1 part by weight of tris(hydroxymethyl)aminomethane hydrochloride buffer, stir evenly to obtain the modified solution.

[0106] (3) Add 4 parts by weight of the modified liquid to 10 parts by weight of the precursor liquid, stir evenly at 100 rpm at 80°C, filter, and dry at 90°C to obtain modified needle-shaped wollastonite powder.

[0107] Example 4

[0108] Compared with Example 1, this embodiment uses an equal amount of cashew nut shell oil bio-based polyol-2 to replace cashew nut shell oil bio-based polyol-1.

[0109] A method for preparing a PET mirror film includes the following steps:

[0110] (1) Provide two PET films with a thickness of 20μm (divided into a first PET film and a second PET film);

[0111] (2) The first PET film was placed in the reaction chamber of the low-temperature plasma treatment instrument, and nitrogen gas was introduced at a flow rate of 50 sccm and treated with a power of 200W for 3 minutes.

[0112] The first PET film is electroplated with aluminum to form an electroplated aluminum layer with a thickness of 20 nm;

[0113] (3) Apply the coloring liquid to the surface of the electroplated layer to form a coloring layer with a thickness of 1μm;

[0114] The color liquid comprises the following components in parts by weight: 60 parts acrylic resin, 20 parts solvent, 0.4 parts leveling agent, 0.2 parts antioxidant, 1.5 parts isophorone diisocyanate, and 4 parts color paste.

[0115] (4) Place it in the reaction chamber of the low-temperature plasma treatment instrument, introduce nitrogen gas at a flow rate of 50 sccm, and treat it with a power of 200W for 3 minutes.

[0116] The second PET film was placed on the surface of the colored layer and then placed in the reaction chamber of the low-temperature plasma treatment instrument. Nitrogen gas was introduced at a flow rate of 50 sccm and treated with a power of 200W for 3 minutes.

[0117] (5) Apply an anti-scratch coating to the surface of the second PET film to form an anti-scratch layer with a thickness of 5 μm.

[0118] The anti-scratch coating comprises the following components in parts by weight: 50 parts hydroxyl acrylic resin, 10 parts cashew nut shell oil bio-based polyol-2, 10 parts modified needle-shaped wollastonite powder, 4 parts polyvinyl alcohol (PVA-1000), 3 parts isophorone diisocyanate, 0.5 parts defoamer, 0.2 parts catalyst, 1 part titanium dioxide, and 20 parts solvent.

[0119] The method for preparing the modified needle-shaped wollastonite powder is as follows:

[0120] (1) Add 10 parts by weight of needle-shaped wollastonite powder with a particle size of 600 mesh, 1 part by weight of stearic acid, 0.5 parts by weight of oleic acid and 10 parts by weight of anhydrous ethanol to 28.5 parts by weight of water, stir evenly at 100 rpm at 80°C, then add 0.5 parts by weight of sorbitan monostearate, stir evenly at 100 rpm to obtain the precursor solution;

[0121] (2) Add 10 parts by weight of amino silicone oil, 6 parts by weight of sodium N-oleoyl-N-methyltaurate and 6 parts by weight of dopamine hydrochloride to 38 parts by weight of water, stir evenly at 100 rpm, then add 1 part by weight of tris(hydroxymethyl)aminomethane hydrochloride buffer, stir evenly to obtain the modified solution.

[0122] (3) Add 4 parts by weight of the modified liquid to 10 parts by weight of the precursor liquid, stir evenly at 100 rpm at 80°C, filter, and dry at 90°C to obtain modified needle-shaped wollastonite powder.

[0123] Example 5

[0124] Compared with Example 1, this embodiment uses an equal amount of cashew nutshell oil bio-based polyol-3 to replace cashew nutshell oil bio-based polyol-1.

[0125] A method for preparing a PET mirror film includes the following steps:

[0126] (1) Provide two PET films with a thickness of 20μm (divided into a first PET film and a second PET film);

[0127] (2) The first PET film was placed in the reaction chamber of the low-temperature plasma treatment instrument, and nitrogen gas was introduced at a flow rate of 50 sccm and treated with a power of 200W for 3 minutes.

[0128] The first PET film is electroplated with aluminum to form an electroplated aluminum layer with a thickness of 20 nm;

[0129] (3) Apply the coloring liquid to the surface of the electroplated layer to form a coloring layer with a thickness of 1μm;

[0130] The color liquid comprises the following components in parts by weight: 60 parts acrylic resin, 20 parts solvent, 0.4 parts leveling agent, 0.2 parts antioxidant, 1.5 parts isophorone diisocyanate, and 4 parts color paste.

[0131] (4) Place it in the reaction chamber of the low-temperature plasma treatment instrument, introduce nitrogen gas at a flow rate of 50 sccm, and treat it with a power of 200W for 3 minutes.

[0132] The second PET film was placed on the surface of the colored layer and then placed in the reaction chamber of the low-temperature plasma treatment instrument. Nitrogen gas was introduced at a flow rate of 50 sccm and treated with a power of 200W for 3 minutes.

[0133] (5) Apply an anti-scratch coating to the surface of the second PET film to form an anti-scratch layer with a thickness of 5 μm.

[0134] The anti-scratch coating comprises the following components in parts by weight: 50 parts hydroxyl acrylic resin, 10 parts cashew nut shell oil bio-based polyol-3, 10 parts modified needle-shaped wollastonite powder, 4 parts polyvinyl alcohol (PVA-1000), 3 parts isophorone diisocyanate, 0.5 parts defoamer, 0.2 parts catalyst, 1 part titanium dioxide, and 20 parts solvent.

[0135] The method for preparing the modified needle-shaped wollastonite powder is as follows:

[0136] (1) Add 10 parts by weight of needle-shaped wollastonite powder with a particle size of 600 mesh, 1 part by weight of stearic acid, 0.5 parts by weight of oleic acid and 10 parts by weight of anhydrous ethanol to 28.5 parts by weight of water, stir evenly at 100 rpm at 80°C, then add 0.5 parts by weight of sorbitan monostearate, stir evenly at 100 rpm to obtain the precursor solution;

[0137] (2) Add 10 parts by weight of amino silicone oil, 6 parts by weight of sodium N-oleoyl-N-methyltaurate and 6 parts by weight of dopamine hydrochloride to 38 parts by weight of water, stir evenly at 100 rpm, then add 1 part by weight of tris(hydroxymethyl)aminomethane hydrochloride buffer, stir evenly to obtain the modified solution.

[0138] (3) Add 4 parts by weight of the modified liquid to 10 parts by weight of the precursor liquid, stir evenly at 100 rpm at 80°C, filter, and dry at 90°C to obtain modified needle-shaped wollastonite powder.

[0139] Example 6

[0140] Compared with Example 1, this embodiment uses an equal amount of cashew nut shell oil bio-based polyol-4 to replace cashew nut shell oil bio-based polyol-1.

[0141] A method for preparing a PET mirror film includes the following steps:

[0142] (1) Provide two PET films with a thickness of 20μm (divided into a first PET film and a second PET film);

[0143] (2) The first PET film was placed in the reaction chamber of the low-temperature plasma treatment instrument, and nitrogen gas was introduced at a flow rate of 50 sccm and treated with a power of 200W for 3 minutes.

[0144] The first PET film is electroplated with aluminum to form an electroplated aluminum layer with a thickness of 20 nm;

[0145] (3) Apply the coloring liquid to the surface of the electroplated layer to form a coloring layer with a thickness of 1μm;

[0146] The color liquid comprises the following components in parts by weight: 60 parts acrylic resin, 20 parts solvent, 0.4 parts leveling agent, 0.2 parts antioxidant, 1.5 parts isophorone diisocyanate, and 4 parts color paste.

[0147] (4) Place it in the reaction chamber of the low-temperature plasma treatment instrument, introduce nitrogen gas at a flow rate of 50 sccm, and treat it with a power of 200W for 3 minutes.

[0148] The second PET film was placed on the surface of the colored layer and then placed in the reaction chamber of the low-temperature plasma treatment instrument. Nitrogen gas was introduced at a flow rate of 50 sccm and treated with a power of 200W for 3 minutes.

[0149] (5) Apply an anti-scratch coating to the surface of the second PET film to form an anti-scratch layer with a thickness of 5 μm.

[0150] The anti-scratch coating comprises the following components in parts by weight: 50 parts hydroxyl acrylic resin, 10 parts cashew nut shell oil bio-based polyol-4, 10 parts modified needle-shaped wollastonite powder, 4 parts polyvinyl alcohol (PVA-1000), 3 parts isophorone diisocyanate, 0.5 parts defoamer, 0.2 parts catalyst, 1 part titanium dioxide, and 20 parts solvent.

[0151] The method for preparing the modified needle-shaped wollastonite powder is as follows:

[0152] (1) Add 10 parts by weight of needle-shaped wollastonite powder with a particle size of 600 mesh, 1 part by weight of stearic acid, 0.5 parts by weight of oleic acid and 10 parts by weight of anhydrous ethanol to 28.5 parts by weight of water, stir evenly at 100 rpm at 80°C, then add 0.5 parts by weight of sorbitan monostearate, stir evenly at 100 rpm to obtain the precursor solution;

[0153] (2) Add 10 parts by weight of amino silicone oil, 6 parts by weight of sodium N-oleoyl-N-methyltaurate and 6 parts by weight of dopamine hydrochloride to 38 parts by weight of water, stir evenly at 100 rpm, then add 1 part by weight of tris(hydroxymethyl)aminomethane hydrochloride buffer, stir evenly to obtain the modified solution.

[0154] (3) Add 4 parts by weight of the modified liquid to 10 parts by weight of the precursor liquid, stir evenly at 100 rpm at 80°C, filter, and dry at 90°C to obtain modified needle-shaped wollastonite powder.

[0155] Comparative Example 1

[0156] The difference between Comparative Example 1 and Example 1 is that an equal amount of acicular wollastonite powder was used to replace the modified acicular wollastonite powder, while all other aspects were the same.

[0157] The anti-scratch coating comprises the following components in parts by weight: 50 parts hydroxyl acrylic resin, 10 parts cashew nut shell oil bio-based polyol-1, 10 parts 600-mesh needle-shaped wollastonite powder, 4 parts polyvinyl alcohol (PVA-1000), 3 parts isophorone diisocyanate, 0.5 parts defoamer, 0.2 parts catalyst, 1 part titanium dioxide, and 20 parts solvent.

[0158] Comparative Example 2

[0159] The difference between Comparative Example 2 and Example 1 is that the preparation method of the modified needle-shaped wollastonite powder in Comparative Example 2 is different from that in Example 1, but all other aspects are the same.

[0160] The method for preparing the modified needle-shaped wollastonite powder is as follows:

[0161] (1) 10 parts by weight of needle-shaped wollastonite powder with a particle size of 600 mesh, 1 part by weight of stearic acid, 0.5 parts by weight of oleic acid, and 10 parts by weight of anhydrous ethanol were added to 28.5 parts by weight of water and stirred evenly at 100 rpm at 80°C. Then, 0.5 parts by weight of sorbitan monostearate were added and stirred evenly at 100 rpm. The mixture was filtered and dried at 90°C to obtain modified needle-shaped wollastonite powder.

[0162] Comparative Example 3

[0163] The difference between Comparative Example 3 and Example 1 is that the preparation method of the modified needle-shaped wollastonite powder in Comparative Example 3 is different from that in Example 1, but all other aspects are the same.

[0164] The method for preparing the modified needle-shaped wollastonite powder is as follows:

[0165] (1) Add 10 parts by weight of needle-shaped wollastonite powder with a particle size of 600 mesh, 1 part by weight of stearic acid, 0.5 parts by weight of oleic acid and 10 parts by weight of anhydrous ethanol to 28.5 parts by weight of water, stir evenly at 100 rpm at 80°C, then add 0.5 parts by weight of sorbitan monostearate, stir evenly at 100 rpm to obtain the precursor solution;

[0166] (2) Add 10 parts by weight of γ-aminopropyltriethoxysilane to 90 parts by weight of water and stir until homogeneous to obtain the modified solution;

[0167] (3) Add 4 parts by weight of the modified liquid to 10 parts by weight of the precursor liquid, stir evenly at 100 rpm at 80°C, filter, and dry at 90°C to obtain modified needle-shaped wollastonite powder.

[0168] Comparative Example 4

[0169] The difference between Comparative Example 4 and Example 1 is that Comparative Example 4 uses an equal amount of modified silica to replace the modified needle-shaped wollastonite powder (the preparation method of modified silica is the same as that of Example 1), and everything else is the same.

[0170] The method for preparing the modified needle-shaped wollastonite powder is as follows:

[0171] (1) Add 10 parts by weight of silica with a particle size of 600 mesh, 1 part by weight of stearic acid, 0.5 parts by weight of oleic acid and 10 parts by weight of anhydrous ethanol to 28.5 parts by weight of water, stir evenly at 100 rpm at 80°C, then add 0.5 parts by weight of sorbitan monostearate, stir evenly at 100 rpm to obtain the precursor solution;

[0172] (2) Add 10 parts by weight of amino silicone oil, 6 parts by weight of sodium N-oleoyl-N-methyltaurate and 6 parts by weight of dopamine hydrochloride to 38 parts by weight of water, stir evenly at 100 rpm, then add 1 part by weight of tris(hydroxymethyl)aminomethane hydrochloride buffer, stir evenly to obtain the modified solution.

[0173] (3) Add 4 parts by weight of the modified liquid to 10 parts by weight of the precursor liquid, stir evenly at 100 rpm at 80°C, filter, and dry at 90°C to obtain modified silica.

[0174] Test case

[0175] 1. Aging Performance: Tested according to standard GB / T 16422.2-2022. A xenon arc lamp and a daylight filter were used to simulate the irradiance spectrum of sunlight. The aging cycle conditions included 102 minutes of illumination (0.51 W / (m·nm), 340 nm), followed by 18 minutes of illumination (0.51 W / (m·nm), 340 nm) plus spraying. The black panel temperature was 50±3℃, the test chamber temperature was 38±3℃, and the relative humidity was 50±10%. The aging test duration was 120 hours.

[0176] Table 1

[0177]

[0178]

[0179] 2. Wear resistance: The measurement method is in accordance with GB1768-79(89). The wear is measured at 50 revolutions. The wear amount is tested (the higher the wear amount, the worse the wear resistance).

[0180] 3. Scratch resistance: A steel needle with a diameter of 1.0 mm and a spherical tip radius of 0.5 mm is used to puncture the PET mirror film at a speed of 50 mm / min. The scratch resistance is measured by the minimum load value that the needle can puncture the release film (the higher the minimum load value, the better the scratch resistance).

[0181] Table 2

[0182] Loss (mg) Minimum load value (N) Example 1 3.5 19.8 Example 2 4.2 19.0 Example 3 3.8 19.3 Example 4 3.6 19.6 Example 5 8.5 16.6 Example 6 7.4 17.2 Comparative Example 1 13.9 11.9 Comparative Example 2 11.8 12.6 Comparative Example 3 11.3 12.8 Comparative Example 4 10.4 13.1

[0183] As can be seen from Tables 1 and 2, the PET mirror film of the present invention has excellent wear resistance, scratch resistance and aging resistance, and has broad application prospects.

[0184] Comparative examples 1 and 4-6 show that by controlling the hydroxyl value of the cashew nut shell oil bio-based polyol to 224-256 mgKOH / g and the viscosity at 25°C to 1200-1710 mPa·s, the wear resistance, scratch resistance and aging resistance can be further improved.

[0185] Comparing Example 1 with Comparative Examples 1-4, it can be seen that the modified acicular wollastonite powder prepared by the present invention can significantly improve wear resistance, scratch resistance and aging resistance. Moreover, the modified acicular wollastonite powder prepared by different methods has different effects on improving wear resistance, scratch resistance and aging resistance. Compared with other methods, the method of the present invention can more significantly improve wear resistance, scratch resistance and aging resistance.

[0186] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A method for preparing a PET mirror film, characterized in that, Includes the following steps: (1) Provide a first PET film and a second PET film; (2) The first PET film is subjected to plasma surface treatment, and the first PET film is electroplated to form an electroplated layer; (3) Apply the coloring solution to the surface of the electroplated layer to form a coloring layer; (4) Perform plasma surface treatment on the coloring layer, place the second PET film on the surface of the coloring layer, and then perform plasma surface treatment on the second PET film; (5) Apply an anti-scratch coating to the surface of the second PET film to form an anti-scratch layer; The anti-scratch coating comprises the following components in parts by weight: 45-55 parts hydroxyl acrylic resin, 6-12 parts cashew nut shell oil bio-based polyol, 9-12 parts modified needle-shaped wollastonite powder, 2-5 parts polyvinyl alcohol, 2-4 parts isophorone diisocyanate, 0.2-0.6 parts defoamer, 0.1-0.2 parts catalyst, 0.5-1.2 parts titanium dioxide, and 15-25 parts second solvent; The method for preparing the modified needle-shaped wollastonite powder is as follows: (1) Add 10 parts by weight of needle-shaped wollastonite powder, 0.8-1.2 parts by weight of stearic acid, 0.4-0.8 parts by weight of oleic acid and 6-12 parts by weight of anhydrous ethanol to 25-40 parts by weight of water, stir evenly at 70-85°C, then add 0.2-0.6 parts by weight of sorbitan monostearate, stir evenly to obtain the precursor solution; (2) Add 10 parts by weight of amino silicone oil, 6-8 parts by weight of sodium N-oleoyl-N-methyltaurate, and 4-6 parts by weight of dopamine hydrochloride to 30-50 parts by weight of water, stir evenly, then add 0.8-1.5 parts by weight of tris(hydroxymethyl)aminomethane hydrochloride buffer solution, stir evenly, and obtain the modified solution. (3) Add 2-5 parts by weight of the modified liquid to 10 parts by weight of the precursor liquid, stir evenly at 70-85℃, filter, and dry to obtain modified needle-shaped wollastonite powder.

2. The method for preparing the PET mirror film according to claim 1, characterized in that, The plasma surface treatment has a power of 100~300W and a time of 1~4min.

3. The method for preparing the PET mirror film according to claim 1, characterized in that, The electroplated layer is made of aluminum, silver, copper, chromium, or zinc; the thickness of the electroplated layer is 10~20nm.

4. The method for preparing the PET mirror film according to claim 1, characterized in that, The thickness of the coloring layer is 0.5~1.2μm.

5. The method for preparing the PET mirror film according to claim 1, characterized in that, The coloring liquid comprises the following components in parts by weight: 50-70 parts acrylic resin, 10-30 parts first solvent, 0.1-0.5 parts leveling agent, 0.1-0.3 parts antioxidant, 1-2 parts isophorone diisocyanate, and 3-5 parts color paste.

6. The method for preparing the PET mirror film according to claim 1, characterized in that, The cashew nut shell oil bio-based polyol has a hydroxyl value of 224~256 mg KOH / g and a viscosity of 1200~1710 mPa·s at 25℃.

7. The method for preparing the PET mirror film according to claim 1, characterized in that, The hydroxyl acrylic resin has a solid content of 44-46 wt%, a viscosity of 1000-4000 mPa·s at 25°C, a hydroxyl content of 2-2.5 wt%, and a glass transition temperature of 40-50°C.

8. The method for preparing the PET mirror film according to claim 1, characterized in that, The particle size of the needle-shaped wollastonite powder is 200~1000 mesh.

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