Gold and silver wire and method for manufacturing the same

Abstract

The present application provides a gold silver wire and a preparation method thereof. The preparation method of the gold silver wire comprises the following steps: preparing an aluminum layer on one side surface of a polyester base material layer; etching the surface of the aluminum layer so that the surface of the aluminum layer away from the polyester base material layer is a rough surface; coating a first coating containing microspheres and an adhesive on the rough surface of the aluminum layer to form a microsphere structure layer on the rough surface of the aluminum layer; and coating a second coating containing a base slurry, a silica aerosol and polyvinylidene fluoride on the microsphere structure layer to form a first protective coating layer on the side of the microsphere structure layer away from the aluminum layer. The present application improves the roughness of the aluminum layer before coating and the cohesion of the epoxy resin coating, improves the thermal stability of the coating, and enables the wire to withstand high-temperature boiling.

Description

Technical Field

[0001] This invention belongs to the field of textile technology, specifically relating to a gold and silver wire and its preparation method. Background Technology

[0002] Metallic threads, also known as metallic coated fibers, are produced by coating a polyester film with aluminum, then applying a protective coating containing color powder, followed by coarse and fine shearing to form threads. As a common decorative textile material, metallic threads possess unique visual effects such as shimmering and reflection. When woven into fabrics, they give the fabric a metallic luster, and are therefore widely used in products such as dresses, stockings, sweaters, hats, shoelaces, and art paintings.

[0003] Fabrics made of interwoven gold and silver threads generally require dyeing and finishing processes before use, thus needing to possess properties such as resistance to acids and alkalis, resistance to boiling, resistance to sunlight, resistance to organic solvents, abrasion resistance, and softness. The stability of the protective coating is a major factor affecting these performance indicators. If the adhesion between the protective coating and the aluminized polyester film is weak, it will inevitably cause a decrease in gloss or even discoloration of the gold and silver threads during high-temperature printing and dyeing processes. Therefore, the preparation of a protective coating for gold and silver threads that can withstand high-temperature boiling is of significant practical importance.

[0004] In view of the above, this application is hereby submitted. Summary of the Invention

[0005] This application focuses on improving the adhesion between the gold and silver wire protective coating and the aluminized polyester film under high-temperature boiling conditions. The aim is to provide a gold and silver wire material and its preparation method, so as to obtain a gold and silver wire protective coating with high adhesion to the aluminized polyester film under high-temperature boiling conditions, thereby providing support for ensuring the stability of gold and silver wire in high-temperature printing and dyeing processes.

[0006] In a first aspect, this application provides a method for preparing gold and silver wire, the method comprising the following steps:

[0007] An aluminum layer is formed on one side surface of the polyester substrate layer;

[0008] The surface of the aluminum layer is etched to make the surface of the aluminum layer away from the polyester substrate layer rough.

[0009] A first coating comprising microspheres and a binder is applied to the rough surface of the aluminum layer to form a microsphere structure layer on the rough surface of the aluminum layer;

[0010] A second coating comprising a base slurry, silica aerosol, and polyvinylidene fluoride is applied onto the microsphere structure layer to form a first protective coating on the side of the microsphere structure layer away from the aluminum layer.

[0011] In some embodiments of this application, the step of etching the surface of the aluminum layer to make the surface of the aluminum layer away from the polyester substrate layer rough includes:

[0012] The polyester substrate layer on which the aluminum layer is formed is immersed in an etching solution, or the aluminum layer is sprayed with an etching solution, then rinsed with water and blown dry.

[0013] In some embodiments of this application, the etching solution is a dilute acid solution containing at least one of dilute sulfuric acid, phosphoric acid, and citric acid; or, the etching solution is prepared by ferric chloride, copper sulfate, and deionized water in a volume ratio of (4-6):(3-5):1, and the Baumé degree of the solution prepared by the three components in the ratio is 15-20°Be.

[0014] In some embodiments of this application, the step of applying a first coating comprising microspheres and an adhesive to the rough surface of the aluminum layer to form a microsphere structure layer on the rough surface of the aluminum layer includes:

[0015] The first coating is atomized into microdroplets in a sealed container, and the microdropletized first coating is sprayed onto the rough surface. Then, the first coating is baked to form the microsphere structure layer. The mass concentration of the microspheres in the first coating is 0.05% to 1%, and the mass concentration of the adhesive is 10% to 30%.

[0016] In some embodiments of this application, the microspheres are silica microspheres with a particle size of less than or equal to 10 nm; and / or, the adhesive is polyvinyl butyral with a viscosity of 1.0 mPa·s to 7.0 mPa·s.

[0017] In some embodiments of this application, the step of applying a second coating comprising a base slurry, silica aerosol, and polyvinylidene fluoride onto the microsphere structure layer to form a first protective coating on the side of the microsphere structure layer away from the aluminum layer includes:

[0018] The second coating is coated onto the microsphere structure layer, and then the second coating is baked to form the first protective coating; wherein, in the second coating, the content of silica aerosol is 0.05% to 1% of the mass of the base slurry, and the content of polyvinylidene fluoride is 3% to 8% of the mass of the base slurry.

[0019] In some embodiments of this application, the preparation method further includes the following steps:

[0020] A second coating comprising a base slurry, silica aerosol, and polyvinylidene fluoride is applied to the surface of the polyester substrate layer facing away from the aluminum layer to form a second protective coating on the side of the polyester substrate layer facing away from the aluminum layer.

[0021] In a second aspect, this application provides a gold and silver wire, the wire comprising: a polyester substrate layer; an aluminum layer disposed on one side surface of the polyester substrate layer, the surface of the aluminum layer away from the polyester substrate layer being a rough surface; a microsphere structure layer disposed on the rough surface of the aluminum layer, the microsphere structure layer being made of a first coating comprising microspheres and an adhesive; and a first protective coating disposed on the side of the microsphere structure layer away from the aluminum layer, the first protective coating being made of a second coating comprising a base slurry, silica aerosol, and polyvinylidene fluoride.

[0022] In some embodiments of this application, the mass concentration of the microspheres in the first coating is 0.05% to 1%, and the mass concentration of the adhesive is 10% to 30%; and / or,

[0023] The microspheres are silica microspheres with a particle size of less than or equal to 10 nm; and / or,

[0024] The adhesive is polyvinyl butyral with a viscosity of 1.0 mPa·s to 7.0 mPa·s; and / or,

[0025] In the second coating, the content of the silica aerosol is 0.05% to 1% of the mass of the base slurry, and the content of the polyvinylidene fluoride is 3% to 8% of the mass of the base slurry; and / or,

[0026] The base slurry comprises 55% resin, 40% solvent, and 5% colorant by mass; wherein, by mass percentage, the solvent comprises 80% ethyl acetate, 10% xylene, and 10% cyclohexanone; wherein, by mass percentage, the resin comprises 45-60% epoxy resin, 25-35% amino resin, and 15-20% alkyd resin; and / or,

[0027] The polyvinylidene fluoride has a molecular weight ≥ 1.2 million; and / or,

[0028] The total thickness of the polyester substrate layer and the aluminum layer is 10μm-12μm; and / or,

[0029] The thickness of the first protective coating is 2μm-4μm.

[0030] In some embodiments of this application, the wire further includes a second protective coating disposed on the side of the polyester substrate layer opposite to the aluminum layer, the second protective coating being made of a second coating comprising a base slurry, silica aerosol and polyvinylidene fluoride.

[0031] The beneficial effects of this application are:

[0032] (1) This application etches the aluminized polyester substrate before the formation of the first protective coating to roughen the surface of the aluminum layer, providing sites for the adhesion of microspheres in the subsequent first coating to the aluminum layer surface, which is beneficial for the adsorption and retention of microspheres.

[0033] (2) In this application, a microsphere structure layer is formed on the surface of the aluminum layer by using a first coating containing microspheres, which further improves the surface roughness and further enhances the adhesion between the first protective coating and the aluminum layer.

[0034] (3) This application introduces polyvinylidene fluoride and silica aerosol into the existing base slurry, which improves the density and hydrophobicity of the first protective coating and provides support for the high temperature boiling resistance of the first protective coating.

[0035] (4) The preparation method of this application has low equipment requirements, simple operation procedures, and universality. The first protective coating formed has a high degree of bonding with the aluminum layer and can withstand high temperature boiling, which lays the foundation for the subsequent processing of gold and silver wires in a high temperature printing and dyeing environment. Attached Figure Description

[0036] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0037] Figure 1 This is a schematic diagram of the wire structure of the present invention.

[0038] Figure 2 This is a scanning electron microscope image of the wire prepared in Example 1 of this application. Detailed Implementation

[0039] The present invention will be described in more detail below with reference to the embodiments. It should be understood that the implementation of the present invention is not limited to the embodiments below, and any modifications and / or alterations made to the present invention will fall within the protection scope of the present invention.

[0040] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0041] In the following examples, unless otherwise specified, the reagents, materials, and equipment used are commercially available, prepared by conventional methods, or commonly used in the industry. Unless otherwise specified, all percentages are in units of mass.

[0042] In the textile industry, the use of metallic threads is enormous, and their quality directly affects the quality of textiles. Currently, the conventional method for preparing metallic threads involves depositing aluminum onto a polyester film to form an aluminized polyester film, and then coating the aluminum layer of the aluminized polyester film with a coating containing color powder and epoxy resin to form a protective coating. When metallic threads are subjected to high-temperature boiling, the adhesion between the protective coating and the aluminum layer decreases, causing the protective coating to peel off and affecting the quality of the metallic threads.

[0043] Based on this, this application provides a wire and a method for preparing the wire, aiming to solve the problem that the protective coating formed by traditional epoxy resin slurry on aluminized polyester film experiences reduced adhesion to the aluminum layer or even detachment under high-temperature boiling conditions. This invention addresses the issue by improving both the roughness of the aluminized polyester film before coating and the cohesiveness of the epoxy resin coating, thus preparing a high-temperature resistant protective coating on the aluminized polyester film to obtain gold and silver wires with stable quality under high-temperature boiling conditions.

[0044] The following will provide a more detailed explanation of the wires used in the example and their manufacturing methods.

[0045] In a first aspect, this application provides a method for preparing gold and silver wire, the method comprising the following steps:

[0046] S1. An aluminum layer is formed on one side surface of the polyester substrate layer.

[0047] Specifically, an aluminum layer is formed on one surface of the polyester substrate layer by plating, and the thickness of the aluminum layer is determined according to the actual situation.

[0048] S2. Etch the surface of the aluminum layer to make the surface of the aluminum layer away from the polyester substrate layer rough.

[0049] Specifically, after the aluminum layer is formed, its surface is etched to create a rough surface structure. This increases the adhesion of subsequent film layers to the aluminum layer and improves the bonding strength. More specifically, it provides adhesion sites for the microspheres in the subsequent first coating to adhere to the aluminum layer surface.

[0050] S3. A first coating comprising microspheres and a binder is applied to the rough surface of the aluminum layer to form a microsphere structure layer on the rough surface of the aluminum layer.

[0051] Specifically, the first coating can be applied to the rough surface of the aluminum layer by means of coating or spraying, and then cured to form a microsphere structure layer attached to the aluminum layer. The adhesive plays the role of bonding the microspheres to the surface of the aluminum layer so as to form a microsphere structure layer on the surface of the aluminum layer. The microspheres can further improve the surface roughness and ensure the adhesion and bonding strength of the subsequent protective coating.

[0052] S4. A second coating comprising a base slurry, silica aerosol, and polyvinylidene fluoride is applied onto the microsphere structure layer to form a first protective coating on the side of the microsphere structure layer away from the aluminum layer.

[0053] Specifically, the second coating can be applied to the microsphere structure layer by coating, spraying, or other methods, and then cured to form a first protective coating attached to the microsphere structure layer. The microsphere structure layer, acting as a transition layer, provides a rough surface on the aluminum layer, which facilitates the adhesion of the first protective coating. This improves the adhesion of the first protective coating to the polyester substrate and enhances the bonding strength between the first protective coating and the aluminized polyester film, thereby improving the high-temperature water resistance of the gold and silver wires.

[0054] Furthermore, the second coating of this application includes not only the base slurry but also polyvinylidene fluoride (PVDF) and silica aerosol. The base slurry refers to a slurry commonly used in the preparation of gold and silver wires to form a protective coating on an aluminum layer. It generally includes colorant, epoxy resin, amino resin, and PVDF resin, which protects the aluminum layer while imparting color to the gold and silver wires.

[0055] In some embodiments of this application, the base slurry is composed of 55% resin, 40% solvent, and 5% colorant by mass percentage; wherein, by mass percentage, the solvent is composed of 80% ethyl acetate, 10% xylene, and 10% cyclohexanone; wherein, by mass percentage, the resin is composed of 45-60% epoxy resin, 25-35% amino resin, and 15-20% alkyd resin.

[0056] In this embodiment, by introducing polyvinylidene fluoride (PVDF) and silica aerosol into the existing epoxy resin slurry system, the density and hydrophobicity of the coating are improved, providing support for the coating's resistance to high-temperature boiling. PVDF resin has good water resistance and film-forming properties; the film formed from it has excellent density and flexibility, and also possesses a certain degree of hydrophobicity. This makes it difficult for water molecules to penetrate the first protective coating during high-temperature boiling, thus preventing the coating from detaching from the film surface. Silica aerosol has a well-developed porous structure, which facilitates the penetration of epoxy resin, amino resin, PVDF resin, and pigments. As a carrier, it helps improve the adhesion between the first protective coating and the microsphere structure layer and the aluminum plating layer. Furthermore, silica aerosol can also act as a filler, which helps improve the density of the first protective coating and prevents water vapor penetration.

[0057] In some embodiments of this application, the step of etching the surface of the aluminum layer to make the surface of the aluminum layer away from the polyester substrate layer roughened specifically includes:

[0058] The polyester substrate layer on which the aluminum layer is formed is immersed in an etching solution, or the aluminum layer is sprayed with an etching solution, then rinsed with water and blown dry.

[0059] The etching solution used can be any solution that can corrode aluminum but will not affect the structure of the polyester substrate layer. For example, a dilute acid solution containing at least one of dilute sulfuric acid, phosphoric acid and citric acid can be used. These dilute acids have the characteristics of being suitable and safe and will not produce dense smoke or irritating odor.

[0060] In some embodiments of this application, the etching solution is a dilute acid solution containing at least one of dilute sulfuric acid, phosphoric acid, and citric acid; or, the etching solution is prepared by ferric chloride, copper sulfate, and deionized water in a volume ratio of (4-6):(3-5):1, and the Baumé degree of the solution prepared by the three components in the ratio is 15-20°Be.

[0061] In some embodiments of this application, the step of applying a first coating comprising microspheres and an adhesive to the rough surface of the aluminum layer to form a microsphere structure layer on the rough surface of the aluminum layer includes:

[0062] The first coating is atomized into microdroplets in a sealed container, and the microdropletized first coating is sprayed onto the rough surface. Then, the first coating is baked to form the microsphere structure layer. The mass concentration of the microspheres in the first coating is 0.05% to 1%, and the mass concentration of the adhesive is 10% to wt%.

[0063] Specifically, a first coating consisting of microspheres at a concentration of 0.05%–1% is used to atomize and spray the aluminized polyester film with microdroplets, further improving the surface roughness of the film and laying the foundation for a tight bond between the subsequent first protective coating and the film. The pretreatment solution also contains an adhesive at a mass concentration of 10wt%–30wt% to bond the microspheres and prevent them from detaching from the aluminized polyester film surface. Microdroplet atomization spraying is used to control the amount of microspheres applied, preventing them from agglomerating and clustering on the film surface, thus avoiding affecting the film's softness and feel.

[0064] Furthermore, in some embodiments of this application, the mass concentration of microspheres in the second coating is preferably 0.1%, and the mass concentration of the adhesive is preferably 20%.

[0065] In some embodiments of this application, the microspheres are silica microspheres with a particle size of less than or equal to 10 nm; and / or, the adhesive is polyvinyl butyral with a viscosity of 1.0 mPa·s to 7.0 mPa·s, more preferably, the adhesive is polyvinyl butyral with a viscosity of 5 mPa·s.

[0066] Since silica microspheres can achieve particle sizes below 10 nm, which is difficult to achieve with other microspheres, they are the preferred choice. Furthermore, silica microspheres possess excellent thermal stability, which helps improve the high-temperature water resistance of gold and silver wires. The smaller the particle size of the silica microspheres, the stronger their adsorption capacity, and the greater the roughness of the resulting structure.

[0067] Furthermore, when applying the second coating using micro-droplet atomization spraying, the viscosity of the liquid cannot be too high. Therefore, polyvinyl butyral with a lower viscosity is selected as the binder to ensure the molding effect of the microsphere structure layer.

[0068] In some embodiments of this application, the step of applying a second coating comprising a base slurry, silica aerosol, and polyvinylidene fluoride onto the microsphere structure layer to form a first protective coating on the side of the microsphere structure layer away from the aluminum layer includes:

[0069] The second coating is coated onto the microsphere structure layer, and then the second coating is baked to form the first protective coating; wherein, in the second coating, the content of silica aerosol is 0.05% to 1% of the mass of the base slurry, and the content of polyvinylidene fluoride is 3% to 8% of the mass of the base slurry.

[0070] By adjusting the amounts of silica aerosol and polyvinylidene fluoride (PVDF), a first protective coating with good density, flexibility, and hydrophobicity can be obtained, thereby improving the high-temperature water resistance of the gold and silver wire. In some embodiments of this application, in the second coating, the content of silica aerosol is 0.1% of the mass of the base slurry, and the content of PVDF is 5% of the mass of the base slurry, wherein the PVDF is a PVDF solution with a concentration of 10% to 20%.

[0071] In some embodiments of this application, the preparation method further includes the following steps:

[0072] A second coating comprising a base slurry, silica aerosol, and polyvinylidene fluoride is applied to the surface of the polyester substrate layer facing away from the aluminum layer to form a second protective coating on the side of the polyester substrate layer facing away from the aluminum layer.

[0073] Specifically, after forming the first protective coating, a second coating is applied to the side of the polyester substrate layer facing away from the aluminum layer. The second coating is then baked and cured to obtain a wire with protective coatings on both sides. The second protective coating exhibits good adhesion to the polyester material layer and will not peel off significantly even under high-temperature boiling conditions.

[0074] In a second aspect, this application provides a gold and silver wire, the wire comprising: a polyester substrate layer; an aluminum layer disposed on one side surface of the polyester substrate layer, the surface of the aluminum layer away from the polyester substrate layer being a rough surface; a microsphere structure layer disposed on the rough surface of the aluminum layer, the microsphere structure layer being made of a first coating comprising microspheres and an adhesive; and a first protective coating disposed on the side of the microsphere structure layer away from the aluminum layer, the first protective coating being made of a second coating comprising a base slurry, silica aerosol, and polyvinylidene fluoride.

[0075] Reference Figure 1 This illustration shows the composition structure of a gold and silver wire according to a specific embodiment of this application, comprising a four-layer structure: a polyester substrate layer 1, an aluminum layer 2, a microsphere structure layer 3, and a first protective coating 4. This application improves surface roughness and enhances the adhesion between the first protective coating and the aluminum layer by using a first coating containing microspheres to form a microsphere structure layer on the surface of the aluminum layer. The introduction of polyvinylidene fluoride and silica aerosol into the existing base slurry improves the density and hydrophobicity of the first protective coating, providing support for the high-temperature boiling resistance of the first protective coating.

[0076] In some embodiments of this application, the mass concentration of the microspheres in the first coating is 0.05% to 1%, and the mass concentration of the adhesive is 10 wt% to 30 wt%. More preferably, the mass concentration of the microspheres is 0.1%, and the mass concentration of the adhesive is 20%. By adjusting the parameters of both, the prepared microsphere structure layer can improve the roughness without affecting the adhesion of the subsequent first protective layer on the aluminized polyester film.

[0077] In some embodiments of this application, the microspheres are silica microspheres with a particle size of less than or equal to 10 nm.

[0078] In some embodiments of this application, the adhesive is polyvinyl butyral with a viscosity of 1.0 mPa·s to 7.0 mPa·s.

[0079] In some embodiments of this application, in the second coating, the content of silica aerosol is 0.05% to 1% of the mass of the base slurry, the content of polyvinylidene fluoride is 3% to 8% of the mass of the base slurry, more preferably the content of silica aerosol is 0.1% of the mass of the base slurry, and the content of polyvinylidene fluoride is 5% of the mass of the base slurry, so as to obtain good density, hydrophobicity and flexibility.

[0080] In some embodiments of this application, the base slurry is composed of 55% resin, 40% solvent, and 5% colorant by mass percentage; wherein, by mass percentage, the solvent is composed of 80% ethyl acetate, 10% xylene, and 10% cyclohexanone; wherein, by mass percentage, the resin is composed of 45-60% epoxy resin, 25-35% amino resin, and 15-20% alkyd resin.

[0081] In some embodiments of this application, the molecular weight of the polyvinylidene fluoride is ≥1.2 million. The higher the molecular weight of the polyvinylidene fluoride resin, the higher the density of the film after film formation.

[0082] In some embodiments of this application, the total thickness of the polyester substrate layer and the aluminum layer is 10μm-12μm, which results in good performance of the prepared gold and silver wires.

[0083] In some embodiments of this application, the thickness of the first protective coating is 2μm-4μm, which makes the gold and silver wires of better quality and stable performance. An excessively thick coating can easily cause the gold and silver wires to lose their special luster.

[0084] In some embodiments of this application, the wire further includes a second protective coating disposed on the side of the polyester substrate layer opposite to the aluminum layer, the second protective coating being made of a second coating comprising a base slurry, silica aerosol and polyvinylidene fluoride.

[0085] It is understandable that gold and silver wires can be prepared by cutting the prepared wire.

[0086] This application addresses the issue of improving the roughness of the pre-coated aluminized polyester film and the cohesiveness of the epoxy resin coating to prepare a high-temperature water-resistant protective coating for gold and silver wires. The coating preparation process has low equipment requirements, simple operation procedures, and is universally applicable.

[0087] Example 1

[0088] A method for preparing gold and silver wire includes the following steps:

[0089] (1) Aluminum is deposited on one side of the polyester substrate layer to obtain an aluminized polyester film. The obtained aluminized film is immersed in a 1% dilute sulfuric acid solution. After immersion for 10 minutes, it is taken out and rinsed with clean water. The air compressor is turned on and the film is blown with a high-pressure blow gun to make the surface of the aluminum layer rough.

[0090] (2) The first coating is obtained by dispersing silica microspheres with an average particle size of 10 nm in a polyvinyl butyral solution with a viscosity of 5 mPa·s. The coating is placed in the nozzle of a microdroplet atomizing sprayer, the air compressor is turned on, and the microdroplet atomizing sprayer is used to spray the coating on the rough surface of the aluminum layer. Then, the coating is dried at 120°C to obtain a microsphere structure layer.

[0091] (3) A 5% polyvinylidene fluoride solution and 0.1% silica aerogel are added to a base slurry (composed of 55% resin, 40% solvent, and 5% color powder by mass. The solvent is composed of 80% ethyl acetate, 10% xylene, and 10% cyclohexanone by mass, wherein the resin is composed of 45% epoxy resin, 35% amino resin, and 20% alkyd resin). After stirring and ultrasonic dispersion, a second coating is obtained. The second coating is poured into a coating slurry tank and coated on the microsphere structure layer. After drying at 170°C, a first protective coating is obtained, which yields the gold and silver wire.

[0092] Figure 2Scanning electron microscopy images of the prepared wire clearly showed a multi-layered structure. Further thickness measurements using a thickness gauge revealed that the thickness of the first protective coating was approximately 1.5 μm. The coated gold and silver wire was then boiled in water at 95°C for 1 hour, and the color and degree of peeling were observed. It was found that the color of the gold and silver wire did not diminish after high-temperature boiling, and the first protective coating did not peel off.

[0093] Example 2

[0094] A method for preparing gold and silver wire includes the following steps:

[0095] (1) Aluminum is deposited on one side of the polyester substrate layer to obtain an aluminized polyester film. The obtained aluminized film is immersed in a 1.5% citric acid solution for 15 minutes. After immersion, it is taken out and rinsed with clean water. The air compressor is turned on and the film is blown with a high-pressure blow gun to make the surface of the aluminum layer rough.

[0096] (2) The first coating is obtained by dispersing silica microspheres with an average particle size of 8 nm in a polyvinyl butyral solution with a viscosity of 10 mPa·s. The coating is placed in the nozzle of a microdroplet atomizing sprayer, the air compressor is turned on, and the microdroplet atomizing sprayer is used to spray the coating on the rough surface of the aluminum layer. Then, the coating is dried at 120°C to obtain a microsphere structure layer.

[0097] (3) A 5% polyvinylidene fluoride solution and 0.1% silica aerogel are added to a base slurry (composed of 55% resin, 40% solvent, and 5% color powder by mass. The solvent is composed of 80% ethyl acetate, 10% xylene, and 10% cyclohexanone by mass. The resin is composed of 60% epoxy resin, 25% amino resin, and 15% alkyd resin). After stirring and ultrasonic dispersion, a second coating is obtained. The second coating is poured into a coating slurry tank and coated on the microsphere structure layer. After drying at 170°C, a first protective coating is obtained, which yields the gold and silver wire.

[0098] The thickness of the first protective coating was measured to be 2.5 μm using a thickness gauge. The coated gold and silver wire was then boiled in water at 90°C for 1 hour, and the color and degree of peeling were observed. It was found that the color of the gold and silver wire did not diminish after high-temperature boiling, and the coating did not peel off.

[0099] Example 3

[0100] A method for preparing gold and silver wire includes the following steps:

[0101] (1) Aluminum is deposited on one side of the polyester substrate layer to obtain an aluminized polyester film. The obtained aluminized film is immersed in a 1.5% phosphoric acid solution for 15 minutes. After immersion, it is taken out and rinsed with clean water. The air compressor is turned on and the film is blown with a high-pressure blow gun to make the surface of the aluminum layer rough.

[0102] (2) The first coating is obtained by dispersing silica microspheres with an average particle size of 10 nm in a polyvinyl butyral solution with a viscosity of 10 mPa·s, placing it in the nozzle of a micro-droplet atomizing sprayer, starting the air compressor, and spraying it on the rough surface of the aluminum layer using the micro-droplet atomizing sprayer, and then drying it at 120°C.

[0103] (3) A 7% polyvinylidene fluoride solution and 0.15% silica aerogel are added to a base slurry (composed of 55% resin, 40% solvent, and 5% color powder by mass. The solvent is composed of 80% ethyl acetate, 10% xylene, and 10% cyclohexanone by mass. The resin is composed of 50% epoxy resin, 35% amino resin, and 15% alkyd resin). After stirring and ultrasonic dispersion, a second coating is obtained. The second coating is poured into a coating slurry tank and coated on the microsphere structure layer. After drying at 170°C, a first protective coating is obtained, which yields the gold and silver wire.

[0104] The thickness of the first protective coating was measured to be 3 μm using a thickness gauge. The coated gold and silver wire was then boiled in water at 95°C for 1 hour, and the color and degree of peeling were observed. It was found that the color of the gold and silver wire did not diminish after high-temperature boiling, and the first protective coating did not peel off.

[0105] Example 4

[0106] A method for preparing gold and silver wire includes the following steps:

[0107] (1) Aluminum is deposited on one side of the polyester substrate layer to obtain an aluminum-coated polyester film. The obtained aluminum-coated film is immersed in an etching solution prepared by ferric chloride, copper sulfate and deionized water in a volume ratio of 5:4:1. After immersion for 15 minutes, it is taken out and rinsed with clean water. The air compressor is turned on and the film is blown with a high-pressure blow gun to make the surface of the aluminum layer rough.

[0108] (2) The first coating is obtained by dispersing silica microspheres with an average particle size of 8 nm in a polyvinyl butyral solution with a viscosity of 5 mPa·s. The coating is placed in the nozzle of a microdroplet atomizing sprayer, the air compressor is turned on, and the microdroplet atomizing sprayer is used to spray the coating on the rough surface of the aluminum layer. Then, the coating is dried at 120°C to obtain a microsphere structure layer.

[0109] (3) A 3% polyvinylidene fluoride solution and 0.15% silica aerogel are added to a base slurry (composed of 55% resin, 40% solvent, and 5% color powder by mass. The solvent is composed of 80% ethyl acetate, 10% xylene, and 10% cyclohexanone by mass. The resin is composed of 45% epoxy resin, 35% amino resin, and 20% alkyd resin). After stirring and ultrasonic dispersion, a second coating is obtained. The second coating is poured into a coating slurry tank and coated on the microsphere structure layer. After drying at 170°C, a first protective coating is obtained, which yields the gold and silver wire.

[0110] The thickness of the first protective coating was measured to be 2 μm using a thickness gauge. The coated gold and silver wire was then boiled in water at 90°C for 1 hour, and the color and degree of peeling were observed. It was found that the color of the gold and silver wire did not diminish after high-temperature boiling, and the first protective coating did not peel off.

[0111] Comparative Example 1

[0112] The difference between this comparative example and Example 1 is that in step (1) of preparing the protective coating, the aluminum film is not treated with a dilute acid solution, i.e., the aluminum layer is not etched. Otherwise, it is the same as Example 1, including the following steps:

[0113] (1) A first coating was obtained by dispersing silica microspheres with an average particle size of 10 nm in a polyvinyl butyral solution with a viscosity of 5 mPa·s. The coating was placed in the nozzle of a microdroplet atomizing sprayer, the air compressor was turned on, and the microdroplet atomizing sprayer was used to spray the coating on the rough surface of the aluminum layer. Then, the coating was dried at 120°C to obtain a microsphere structure layer.

[0114] (2) A 5% polyvinylidene fluoride solution and 0.1% silica aerogel are added to a base slurry (composed of 55% resin, 40% solvent, and 5% color powder by mass. The solvent is composed of 80% ethyl acetate, 10% xylene, and 10% cyclohexanone by mass, wherein the resin is composed of 45% epoxy resin, 35% amino resin, and 20% alkyd resin). After stirring and ultrasonic dispersion, a second coating is obtained. The second coating is poured into a coating slurry tank and coated on the microsphere structure layer. After drying at 170°C, a first protective coating is obtained, which yields the gold and silver wire.

[0115] The thickness of the first protective coating was measured to be 2.4 μm using a thickness gauge. The coated gold and silver wire film was then boiled in water at 95°C for 1 hour, and the color and degree of peeling were observed. It was found that although the coating did not peel significantly after high-temperature boiling, the film color slightly decreased, and the luster became duller.

[0116] Comparative Example 2

[0117] The difference between this comparative example and Example 1 is that in step (2) of preparing the protective coating, the aluminized film is not treated with a first coating composed of silica microspheres and polyvinyl butyral to form a microsphere structure layer. Otherwise, it is the same as Example 1, including the following steps:

[0118] (1) Aluminum is deposited on one side of the polyester substrate layer to obtain an aluminized polyester film. The obtained aluminized film is immersed in a 1% dilute sulfuric acid solution. After immersion for 10 minutes, it is taken out and rinsed with clean water. The air compressor is turned on and the film is blown with a high-pressure blow gun to make the surface of the aluminum layer rough.

[0119] (2) A 5% polyvinylidene fluoride solution and 0.1% silica aerogel are added to a base slurry (composed of 55% resin, 40% solvent, and 5% color powder by mass. The solvent is composed of 80% ethyl acetate, 10% xylene, and 10% cyclohexanone by mass, wherein the resin is composed of 45% epoxy resin, 35% amino resin, and 20% alkyd resin). After stirring and ultrasonic dispersion, a second coating is obtained. The second coating is poured into a coating slurry tank and coated on the microsphere structure layer. After drying at 170°C, a first protective coating is obtained, which yields the gold and silver wire.

[0120] The thickness of the first protective coating was measured to be 2.2 μm using a thickness gauge. The coated gold and silver wire film was then boiled in water at 95°C for 1 hour, and the color and degree of peeling were observed. It was found that although no significant peeling occurred after high-temperature boiling, the color of the gold and silver wire film decreased, and its luster became duller.

[0121] Comparative Example 3

[0122] The difference between this comparative example and Example 1 is that polyvinylidene fluoride is not added in step (3) of preparing the protective coating. Otherwise, it is the same as Example 1, including the following steps:

[0123] (1) Aluminum is deposited on one side of the polyester substrate layer to obtain an aluminized polyester film. The obtained aluminized film is immersed in a 1% dilute sulfuric acid solution. After immersion for 10 minutes, it is taken out and rinsed with clean water. The air compressor is turned on and the film is blown with a high-pressure blow gun to make the surface of the aluminum layer rough.

[0124] (2) The first coating is obtained by dispersing silica microspheres with an average particle size of 10 nm in a polyvinyl butyral solution with a viscosity of 5 mPa·s. The coating is placed in the nozzle of a microdroplet atomizing sprayer, the air compressor is turned on, and the microdroplet atomizing sprayer is used to spray the coating on the rough surface of the aluminum layer. Then, the coating is dried at 120°C to obtain a microsphere structure layer.

[0125] (3) 0.1% silica aerogel is added to the base slurry (composed of 55% resin, 40% solvent, and 5% color powder by mass. The solvent is composed of 80% ethyl acetate, 10% xylene, and 10% cyclohexanone by mass, wherein the resin is composed of 45% epoxy resin, 35% amino resin, and 20% alkyd resin). After stirring and ultrasonic dispersion, a second coating is obtained. The second coating is poured into a coating slurry tank and coated on the microsphere structure layer. After drying at 170°C, a first protective coating is obtained, which yields the gold and silver wire.

[0126] Using a thickness gauge, the thickness of the first protective coating was measured to be approximately 2.3 μm. The coated gold and silver wire film was then boiled in water at 95°C for 1 hour, and the color and degree of peeling were observed. It was found that the color of the gold and silver wire significantly decreased after high-temperature boiling, the luster became dull, and the coating peeled off in some areas.

[0127] Comparative Example 4

[0128] The difference between this comparative example and Example 1 is that silica aerogel is not added in step (3) of preparing the protective coating. Otherwise, it is the same as Example 1, including the following steps:

[0129] (1) Aluminum is deposited on one side of the polyester substrate layer to obtain an aluminized polyester film. The obtained aluminized film is immersed in a 1% dilute sulfuric acid solution. After immersion for 10 minutes, it is taken out and rinsed with clean water. The air compressor is turned on and the film is blown with a high-pressure blow gun to make the surface of the aluminum layer rough.

[0130] (2) The first coating is obtained by dispersing silica microspheres with an average particle size of 10 nm in a polyvinyl butyral solution with a viscosity of 5 mPa·s. The coating is placed in the nozzle of a microdroplet atomizing sprayer, the air compressor is turned on, and the microdroplet atomizing sprayer is used to spray the coating on the rough surface of the aluminum layer. Then, the coating is dried at 120°C to obtain a microsphere structure layer.

[0131] (3) A 5% polyvinylidene fluoride solution with a concentration of 20% is added to the base slurry (composed of 55% resin, 40% solvent, and 5% color powder by mass. The solvent is composed of 80% ethyl acetate, 10% xylene, and 10% cyclohexanone by mass, wherein the resin is composed of 45% epoxy resin, 35% amino resin, and 20% alkyd resin). After stirring and ultrasonic dispersion, a second coating is obtained. The second coating is poured into a coating slurry tank and coated on the microsphere structure layer. After drying at 170°C, a first protective coating is obtained, which yields the gold and silver wire.

[0132] Using a thickness gauge, the thickness of the single-sided coating was measured to be approximately 2.5 μm. The coated gold and silver wire film was then boiled in water at 95°C for 1 hour, and the color and degree of peeling were observed. It was found that the coating did not peel off significantly after high-temperature boiling, but the color of the gold and silver wire decreased, and its luster became duller.

[0133] Comparative Example 5

[0134] The difference between this comparative example and Example 1 is that polyvinylidene fluoride and silica aerosol are not added in step (3) of preparing the protective coating. Otherwise, it is the same as Example 1, including the following steps:

[0135] (1) Aluminum is deposited on one side of the polyester substrate layer to obtain an aluminized polyester film. The obtained aluminized film is immersed in a 1% dilute sulfuric acid solution. After immersion for 10 minutes, it is taken out and rinsed with clean water. The air compressor is turned on and the film is blown with a high-pressure blow gun to make the surface of the aluminum layer rough.

[0136] (2) The first coating is obtained by dispersing silica microspheres with an average particle size of 10 nm in a polyvinyl butyral solution with a viscosity of 5 mPa·s. The coating is placed in the nozzle of a microdroplet atomizing sprayer, the air compressor is turned on, and the microdroplet atomizing sprayer is used to spray the coating on the rough surface of the aluminum layer. Then, the coating is dried at 120°C to obtain a microsphere structure layer.

[0137] (3) The base slurry (composed of 55% resin, 40% solvent and 5% color powder by mass percentage. The solvent is composed of 80% ethyl acetate, 10% xylene and 10% cyclohexanone by mass percentage, wherein the resin is composed of 45% epoxy resin, 35% amino resin and 20% alkyd resin) is stirred and ultrasonically dispersed to obtain the second coating. The second coating is poured into the coating slurry tank and coated on the microsphere structure layer. After drying at 170°C, the first protective coating is obtained, which is the gold and silver wire.

[0138] Using a thickness gauge, the thickness of the first protective coating was measured to be approximately 2.3 μm. The coated gold and silver wire film was then boiled in water at 95°C for 1 hour, and the color and degree of peeling were observed. It was found that the color of the gold and silver wire significantly decreased after high-temperature boiling, the luster became dull, and the coating noticeably peeled off.

[0139] Comparative Example 6

[0140] The difference between this comparative example and Example 1 is that in step (1) of preparing the protective coating, the aluminum film is not treated with a dilute acid solution, i.e., the aluminum layer is not etched; in step (2), the aluminum film is not treated with a first coating composed of silica microspheres and polyvinyl butyral to form a microsphere structure layer; and in step (3), polyvinylidene fluoride and silica aerosol are not added. The rest is the same as in Example 1, including the following steps:

[0141] (1) Aluminum is deposited on one side of the polyester substrate layer to obtain an aluminized polyester film;

[0142] (2) The base slurry (composed of 55% resin, 40% solvent and 5% color powder by mass. The solvent is composed of 80% ethyl acetate, 10% xylene and 10% cyclohexanone by mass, wherein the resin is composed of 45% epoxy resin, 35% amino resin and 20% alkyd resin) is stirred and ultrasonically dispersed to obtain the second coating. The second coating is poured into the coating slurry tank and coated on the microsphere structure layer. After drying at 170°C, the first protective coating is obtained, which is the gold and silver wire.

[0143] Using a thickness gauge, the thickness of the first protective coating was measured to be approximately 2.2 μm. The coated gold and silver wire film was then boiled in water at 95°C for 1 hour, and the color and degree of peeling were observed. It was found that the color of the gold and silver wire significantly decreased after high-temperature boiling, the luster became dull, and the coating peeled off over a large area.

[0144] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of the present invention.

Claims

1. A method of producing a gold and silver wire, characterized by, The steps include the following: An aluminum layer is formed on one side surface of the polyester substrate layer; The surface of the aluminum layer is etched to make the surface of the aluminum layer away from the polyester substrate layer rough. A first coating comprising microspheres and a binder is applied to the rough surface of the aluminum layer to form a microsphere structure layer on the rough surface of the aluminum layer; A second coating comprising a base slurry, silica aerosol, and polyvinylidene fluoride is applied onto the microsphere structure layer to form a first protective coating on the side of the microsphere structure layer away from the aluminum layer. The step of etching the surface of the aluminum layer to make the surface of the aluminum layer away from the polyester substrate layer rough includes: The polyester substrate layer on which the aluminum layer is formed is immersed in an etching solution, or the aluminum layer is sprayed with an etching solution, then rinsed with water and blown dry. The step of applying a first coating comprising microspheres and an adhesive to the rough surface of the aluminum layer to form a microsphere structure layer on the rough surface of the aluminum layer includes: The first coating is atomized into microdroplets in a sealed container, and the microdropletized first coating is sprayed onto the rough surface. Then, the first coating is baked to form the microsphere structure layer. The microspheres are silica microspheres with a particle size of less than or equal to 10 nm, and the binder is polyvinyl butyral with a viscosity of 1.0 mPa·s to 7.0 mPa·s.

2. The production method according to claim 1, characterized by, The etching solution is a dilute acid solution containing at least one of dilute sulfuric acid, phosphoric acid, and citric acid; or, the etching solution is prepared by ferric chloride, copper sulfate, and deionized water in a volume ratio of (4~6):(3~5):1, and the Baumé degree of the solution prepared by the three components in the ratio is 15~20°Be.

3. The preparation method according to claim 1, characterized in that, The mass concentration of the microspheres in the first coating is 0.05% to 1%, and the mass concentration of the adhesive is 10% to 30%.

4. The preparation method according to claim 1, characterized in that, The step of applying a second coating comprising a base slurry, silica aerosol, and polyvinylidene fluoride onto the microsphere structure layer to form a first protective coating on the side of the microsphere structure layer away from the aluminum layer includes: The second coating is coated onto the microsphere structure layer, and then the second coating is baked to form the first protective coating; wherein, in the second coating, the content of silica aerosol is 0.05% to 1% of the mass of the base slurry, and the content of polyvinylidene fluoride is 3% to 8% of the mass of the base slurry.

5. The preparation method according to any one of claims 1 to 4, characterized in that, It also includes the following steps: A second coating comprising a base slurry, silica aerosol, and polyvinylidene fluoride is applied to the surface of the polyester substrate layer facing away from the aluminum layer to form a second protective coating on the side of the polyester substrate layer facing away from the aluminum layer.

6. A gold and silver wire, characterized in that, The gold and silver wires include: Polyester substrate layer; An aluminum layer is disposed on one side surface of the polyester substrate layer, and the surface of the aluminum layer away from the polyester substrate layer is a rough surface. A microsphere structure layer is disposed on the roughened surface of the aluminum layer, the microsphere structure layer being made of a first coating comprising microspheres and an adhesive; and The first protective coating is disposed on the side of the microsphere structure layer away from the aluminum layer, and the first protective coating is made of a second coating comprising a base slurry, silica aerosol and polyvinylidene fluoride; The microspheres are silica microspheres with a particle size of less than or equal to 10 nm, and the binder is polyvinyl butyral with a viscosity of 1.0 mPa·s to 7.0 mPa·s.

7. The gold and silver wire according to claim 6, characterized in that, The mass concentration of the microspheres in the first coating is 0.05%~1%, and the mass concentration of the adhesive is 10%~30%; and / or, In the second coating, the content of the silica aerosol is 0.05% to 1% of the mass of the base slurry, and the content of the polyvinylidene fluoride is 3% to 8% of the mass of the base slurry; and / or, The base slurry comprises 55% resin, 40% solvent, and 5% colorant by mass; wherein, by mass percentage, the solvent comprises 80% ethyl acetate, 10% xylene, and 10% cyclohexanone; wherein, by mass percentage, the resin comprises 45-60% epoxy resin, 25-35% amino resin, and 15-20% alkyd resin; and / or, The polyvinylidene fluoride has a molecular weight ≥ 1.2 million; and / or, The total thickness of the polyester substrate layer and the aluminum layer is 10 µm-12 µm; and / or, The thickness of the first protective coating is 2 µm-4 µm.

8. The gold and silver wire according to claim 6 or 7, characterized in that, It also includes a second protective coating, which is disposed on the side of the polyester substrate layer opposite to the aluminum layer. The second protective coating is made of a second coating comprising a base slurry, silica aerosol and polyvinylidene fluoride.

Images