A film-coated plate with metal wire drawing effect and preparation method thereof

Abstract

The present application relates to the field of VCM laminated boards, and more specifically, it relates to a laminated board with a metal brushed effect and a preparation method thereof. A laminated board with a metal brushed effect comprises a composite film and a substrate, wherein the composite film is bonded to the surface of the substrate; the composite film comprises a base film, one side of the base film is provided with a UV light curing layer, and the other side of the base film is provided with a UV transparent varnish brushed layer, a silver powder layer, and a back adhesive adhesion layer in sequence; the silver powder layer is printed by aqueous silver ink, and according to the mass percentage of aqueous silver ink, it comprises the following components: 15-25% silver powder, 20-30% film-forming resin, 0.5-2% dispersant, 0.1-1% defoamer, 0.1-1% coconut shell fiber, 0.1-1% jute fiber, water; the dispersant comprises sodium succinate sulfonate and polyethylene glycol fatty acid ester. The present application can improve the performance of VCM laminated boards, so that they have good metallic texture and a long service life.

Description

Technical Field

[0001] The present application relates to the field of VCM laminated boards, and more specifically, to a laminated board with a metal brushed effect and a preparation method thereof. Background Art

[0002] VCM laminated sheet, also known as color laminated steel sheet, is a product made by surface treating galvanized steel sheet through a series of processes, and then rolling or bonding a layer of organic film (usually PVC or PET film) on its surface, and then baking it. This kind of laminated sheet can show rich colors and texture effects because the film material on its surface has special printable processing properties.

[0003] The production process of VCM laminated boards is generally as follows: PVC or PET film is tightly attached to galvanized steel plate through a hot pressing process, followed by special processing such as rolling, cooling and curing to ensure a strong bond between the film and the substrate.

[0004] VCM laminates have been widely used in the field of home appliances, especially in high-end home appliances such as refrigerators and washing machines. Their luxurious and fashionable appearance is deeply loved by consumers and has become an important factor in improving the overall quality and market competitiveness of home appliances.

[0005] However, the VCM laminates used in high-end home appliances on the market, although mostly made of PET film that imitates stainless steel and looks high-end, are actually often achieved through aluminum plating. Although the aluminum plating process can simulate the texture of metal, it has the disadvantages of being easy to corrode and having poor salt spray resistance, resulting in a high risk of product quality and failing to meet customers' expectations for product life. Summary of the invention

[0006] In order to improve the performance of a VCM laminated board so that it has a good metallic texture and a longer service life, the present application provides a laminated board with a metal brushed effect and a preparation method thereof.

[0007] In the first aspect, the present application provides a laminated board with a metal brushed effect, which adopts the following technical solution:

[0008] A coated plate with a metal wire drawing effect, comprising a composite film and a substrate, wherein the composite film is bonded to the surface of the substrate;

[0009] The composite film comprises a base film, one side of the base film is provided with a UV light curing layer, and the other side of the base film is provided with a UV transparent varnish drawing layer, a silver powder layer, and a back adhesive layer in sequence;

[0010] The silver powder layer is printed by water-based silver ink, and includes the following components according to the mass percentage of the water-based silver ink: 15-25% silver powder, 20-30% film-forming resin, 0.5-2% dispersant, 0.1-1% defoamer, 0.1-1% coconut shell fiber, 0.1-1% jute fiber, and water;

[0011] Dispersants include sodium sulfosuccinate, polyethylene glycol fatty acid esters.

[0012] UV light-curing layer, adjust the appearance color, gloss and other effects through light-curing materials.

[0013] The UV transparent varnish brushed layer and the entire silver powder layer work together to give the product a delicate metallic effect.

[0014] The adhesive layer can partially protect the printed layer and increase the adhesion of the product.

[0015] By adopting the above technical solution, the present application uses a silver powder layer to replace the conventional aluminum plating layer, which can not only solve the shortcomings of the aluminum plating process, but also improve the overall performance and appearance texture of the product, better meet customer needs and expectations, and greatly improve the performance of the VCM laminated board.

[0016] Specifically, the silver powder layer has good corrosion resistance and oxidation resistance, and can effectively resist corrosion factors in the external environment, thereby extending the service life of the product. The silver powder layer also has excellent electrical and thermal conductivity, which has unique advantages in certain specific applications. The texture of the silver powder can also give the product a noble and elegant appearance, improving the overall texture of the product.

[0017] The silver powder layer is printed with a special water-based silver ink. In the water-based silver ink, coconut shell fiber, jute fiber and dispersant are used together to indirectly affect the dispersion and suspension stability of silver by improving the consistency of the ink. Coconut shell fiber and jute fiber help to adjust the viscosity and fluidity of the ink. By adjusting the consistency of the ink, the suspension state and uniformity of the silver powder particles in the ink can be affected. The appropriate consistency can ensure that the silver particles remain in a stable suspension state in the ink and prevent the particles from settling and agglomerating. At the same time, good fluidity also helps the ink to spread and penetrate evenly during the printing process, thereby further improving the quality and stability of the printed product.

[0018] Preferably, the dispersant is sodium succinate sulfonate and polyethylene glycol fatty acid ester, and the mass ratio of sodium succinate sulfonate to polyethylene glycol fatty acid ester is 1:(0.8-1.2).

[0019] By adopting the above technical solution, the dosage relationship of the dispersant is further limited.

[0020] As surfactants, polyethylene glycol laurate and sodium sulfosuccinate play a key role in improving the dispersion of silver powder in water-based inks. The non-ionic nature of polyethylene glycol laurate enables it to form a stable protective film on the surface of silver particles, preventing agglomeration between particles through steric hindrance. At the same time, its good emulsification helps to evenly disperse silver particles in water-based inks. The anionic nature of sodium sulfosuccinate provides a charge repulsion effect for silver particles, further enhancing the dispersion stability between particles. The two surfactants can significantly reduce the surface tension of silver particles through synergistic action, making it easier to disperse in the ink system, thereby improving the dispersion uniformity and stability of the ink.

[0021] Polyethylene glycol laurate and sodium sulfosuccinate improve the dispersion of silver powder in water-based inks through the action of surfactants, while jute fiber and coconut shell fiber indirectly affect the dispersion and suspension stability of silver by adjusting the ink consistency. These two mechanisms complement each other and work together to keep the silver particles in the water-based ink in a stable dispersed and suspended state, thereby improving the quality of the ink printing performance.

[0022] Preferably, according to the mass percentage of the aqueous silver ink, the coconut shell fiber is 0.7-1%, and the jute fiber is 0.1-0.3%.

[0023] By adopting the above technical scheme, the dosage relationship of jute fiber and coconut shell fiber in the system is further limited, so that jute fiber, coconut shell fiber and polyethylene glycol laurate and sodium succinate sulfonate have a more sufficient coordination relationship, thereby better maintaining the uniform dispersion and good suspension of silver powder, and showing a long-lasting and stable metal effect.

[0024] Preferably, the silver powder comprises a mixture of one or more of 0.01-0.05 μm silver powder and 0.1-0.3 μm silver powder.

[0025] Preferably, the silver powder is a mixture of 0.01-0.05 μm silver powder and 0.1-0.3 μm silver powder, and the mass ratio of 0.01-0.05 μm silver powder to 0.1-0.3 μm silver powder is 1:(0.1-0.3).

[0026] Silver powder particles of 0.01-0.05μm are small, which can form a delicate and evenly distributed metallic luster, making the ink show a smooth and textured metal surface after printing. Silver powder particles of 0.1-0.3μm are relatively large, which can form a certain light scattering effect in the ink, increase the layering of the metallic luster, and make the printed product show a variety of metallic textures at different angles.

[0027] By adopting the above technical solution, the dosage of silver powder particles of different particle sizes is further limited, and the silver powder forms a patchwork distribution in the ink, which increases the contact area between the ink and the substrate, thereby improving the adhesion of the ink. In addition, the silver powder particles of different particle sizes have the effect of filling each other in the ink, forming a more compact stacking structure, which helps to improve the fluidity of the ink, so that the ink can be evenly and smoothly spread on the substrate during the printing process.

[0028] In addition, silver powder particles of different particle sizes form a multi-layer anti-corrosion structure in the ink, increasing the thickness and density of the anti-corrosion layer, effectively extending the service life of the laminate. Silver powder particles with larger particle sizes (0.1-0.3μm) can also play a supporting role in the ink, reducing the wear of the ink layer during long-term use and extending the life of the printed product.

[0029] Preferably, the UV light-curable layer is cured by a light-curable material, and the light-curable material includes a mixture of one or more of polyester acrylate, epoxy acrylate, and polyurethane acrylate.

[0030] Preferably, the thickness of the silver powder layer is 300-500nm.

[0031] In a second aspect, the present application provides a method for preparing a film-coated plate having a metal brushed effect, using the following technical solution:

[0032] A method for preparing a film-coated plate with a metal brushed effect comprises the following steps:

[0033] Step 1: Print a brushed pattern on the surface of the base film with transparent varnish, and then cure it with UV light to form a UV transparent varnish brushed layer;

[0034] Step 2: Fully print the water-based silver ink on the side of the UV transparent varnish drawing layer away from the base film, and the water-based silver ink becomes a silver powder layer after printing;

[0035] Step 3: Apply the adhesive roller to the side of the silver powder layer away from the UV transparent varnish drawing layer. After the adhesive is cured, it becomes an adhesive adhesion layer;

[0036] Step 4: Roll-coat the light-curing material on the side of the base film away from the UV transparent varnish drawing layer, and form a UV light-curing layer through UV light curing;

[0037] A composite membrane is prepared by the above steps;

[0038] Step 5: Paste the composite film on the surface of the substrate to obtain a coated board with a metal brushed effect;

[0039] The preparation method of aqueous silver ink comprises the following steps:

[0040] Step a: mixing water, silver powder, dispersant, coconut shell fiber and jute fiber, treating them at an ultrasonic frequency of 25-35 kHz for 10-20 minutes, and then stirring and mixing them at a speed of 2000-2500 r / min for 25-35 minutes to obtain a first mixture;

[0041] Step b: stirring and mixing the silver powder, the film-forming resin and the first mixture at a speed of 1500-2000 r / min and a temperature of 95-105° C. to obtain a second mixture;

[0042] Step c: mixing the remaining raw materials with the second mixture to obtain aqueous silver ink.

[0043] By adopting the above technical solution, the main core of this application lies in the silver powder layer. The special water-based silver ink can be coated through conventional processes to achieve a good and durable metal effect without complicated processes, which is conducive to industrial promotion and use.

[0044] In the preparation method of water-based silver ink, special ultrasound and high-speed stirring methods are used to treat silver powder, dispersant, coconut shell fiber and jute fiber. The cavitation effect of ultrasound can produce strong microjets and shock waves. These physical forces help to break the agglomeration and entanglement between silver powder, coconut shell fiber and jute fiber, making them more evenly dispersed in water. Part of the silver powder can also be embedded in the structure of coconut shell fiber and jute fiber, and it is not easy to fall off. At the same time, the dispersant can also be more effectively adsorbed on the surface of silver powder and fiber under the action of ultrasound, further promoting dispersion.

[0045] Subsequent high-speed stirring may enhance the physical bonding between the silver powder, coconut shell fiber, jute fiber and dispersant, which helps to improve the adhesion and durability of the ink and also makes the dispersion system more stable.

[0046] Preferably, the coconut shell fiber and jute fiber are chopped into 50-100 μm before being mixed with water, silver powder and dispersant in step a.

[0047] By adopting the above technical solution, the coconut shell fiber and jute fiber are chopped up and can be more fully matched with the silver powder and the dispersant, thereby effectively improving the effect of the silver powder layer.

[0048] In summary, this application has the following beneficial effects:

[0049] 1. This application uses a silver powder layer to replace the commonly used aluminum plating layer, effectively overcoming the shortcomings of the aluminum plating process, such as easy corrosion and poor salt spray resistance, while significantly improving the overall performance and appearance texture of the product. The silver powder layer greatly extends the service life of the product due to its excellent corrosion resistance and oxidation resistance. In addition, its excellent electrical and thermal conductivity shows unique advantages in specific occasions. The unique texture of the silver powder adds a noble and elegant temperament to the product and improves the comprehensive performance of the VCM laminate.

[0050] 2. The silver powder layer is printed with a special water-based silver ink, and its dispersion and suspension stability is affected by coconut shell fiber, jute fiber and dispersant. Coconut shell fiber and jute fiber adjust the viscosity and fluidity of the ink to ensure that the silver particles are evenly suspended and prevent sedimentation and agglomeration. Polyethylene glycol laurate and sodium succinate sulfonate are used as surfactants. They form a protective film on the surface of silver particles and provide a charge repulsion effect through their non-ionic and anionic properties, respectively, to enhance dispersion stability. These two mechanisms work synergistically to significantly reduce the surface tension of silver particles, improve the dispersion uniformity and stability of the ink, and thus improve quality.

[0051] 3. Special water-based silver ink is coated through conventional processes to achieve durable and beautiful metal effects, which is conducive to industrial applications. In the preparation of water-based silver ink, ultrasound and high-speed stirring are combined under specific conditions to evenly disperse the dispersant, silver powder, coconut shell fiber and jute fiber, and promote the embedding of silver powder into the fiber structure, enhance the binding force, improve the dispersion effect, enhance physical bonding, effectively improve the ink adhesion and durability, ensure the stability of the dispersion system, and help to prepare high-quality laminated boards. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a schematic diagram of the structure of the composite membrane of Example 1 of the present application.

[0053] Description of reference numerals:

[0054] 1. Base film; 2. UV light curing layer; 3. UV transparent varnish drawing layer; 4. Silver powder layer; 5. Adhesive adhesive layer. DETAILED DESCRIPTION

[0055] The present application is further described in detail below with reference to the accompanying drawings and embodiments.

[0056] The raw materials used in the following examples and comparative examples are all commercially available products.

[0057] Example 1

[0058] A film-covered plate with a metal wire drawing effect comprises a composite film and a substrate, wherein the composite film is bonded and arranged on the surface of the substrate.

[0059] The base plate is galvanized steel.

[0060] Reference Figure 1 The composite film includes a base film 1, a UV light curing layer 2 is arranged on one side of the base film 1, and a UV transparent varnish drawing layer 3, a silver powder layer 4, and a back glue adhesion layer 5 are arranged in sequence on the other side of the base film 1.

[0061] The base film 1 is a conventional transparent PET film in the art.

[0062] According to tests, when the thickness of the base film 1 is 30±5μm, the haze is 0.2-1.0, and the transmittance is 80%-97%, the effect is better. The corresponding base film 1 can be selected according to actual needs.

[0063] The UV light-curing layer 2 is formed by UV light-curing a light-curing material. The light-curing material can be one or more of polyester acrylate, epoxy acrylate, and polyurethane acrylate. In this embodiment, the light-curing material is commercially available epoxy acrylate.

[0064] According to tests, the effect is better when the thickness of the UV light curing layer 2 is 5-7 μm.

[0065] The UV transparent varnish drawing layer 3 is made of commercially available transparent varnish, with a drawing pattern printed thereon, and then the transparent UV transparent varnish drawing layer 3 is formed by UV light curing.

[0066] According to the test, the effect is better when the thickness of UV transparent varnish drawing layer 3 is 5-7μm.

[0067] The silver powder layer 4 is printed by water-based silver ink.

[0068] The water-based silver ink comprises the following components according to the mass percentage: silver powder, film-forming resin, dispersant, defoaming agent, coconut shell fiber, jute fiber and water.

[0069] The specific content of each component is shown in Table 1.

[0070] The dispersant is sodium succinate sulfonate and polyethylene glycol fatty acid ester, and the mass ratio of sodium succinate sulfonate and polyethylene glycol fatty acid ester is 1:1.

[0071] The film-forming resin is a water-based acrylic resin emulsion, specifically Soluryl-90 from Hanwha in this embodiment.

[0072] The defoaming agent is commercially available, and in this embodiment, it is Tego Foamex 810.

[0073] Coconut shell fiber is commercially available, and in this embodiment it was purchased from Shandong Lvhe Composite Materials Co., Ltd.

[0074] Jute fiber is commercially available, and in this embodiment, it was purchased from Xingtai Hanpeng Machinery Parts Co., Ltd.

[0075] Polyethylene glycol fatty acid esters are commercially available, and in this embodiment they are purchased from Hai'an Guoli Chemical Co., Ltd., specifically polyethylene glycol 200 monolaurate.

[0076] The silver powder is a mixture of 0.01-0.05 μm silver powder and 0.1-0.3 μm silver powder, and the mass ratio of the 0.01-0.05 μm silver powder and the 0.1-0.3 μm silver powder is 1:0.2.

[0077] The preparation method of water-based silver ink comprises the following steps:

[0078] Step a: Put coconut shell fiber and jute fiber into a pulverizer and chop them into 80 μm.

[0079] Water, silver powder, dispersant, coconut shell fiber and jute fiber were mixed and treated at an ultrasonic frequency of 30 KHz for 15 minutes.

[0080] Then, the mixture was stirred and mixed at a rotation speed of 2300 r / min for 30 min to obtain a first mixture.

[0081] Step b: Stir and mix the silver powder, the film-forming resin and the first mixture at a speed of 1800 r / min and a temperature of 100° C. for 35 minutes to obtain a second mixture.

[0082] Step c: adding the remaining raw materials to the second mixture and mixing for 35 minutes to obtain aqueous silver ink.

[0083] According to tests, the effect is better when the thickness of the silver powder layer 4 is 300-500nm.

[0084] The adhesive layer 5 is formed by curing conventional commercially available adhesive in the art.

[0085] According to the test, the effect is better when the thickness of the adhesive layer is 5-8μm.

[0086] The present application prints a metal brushed pattern by combining a silver powder layer 4 and a UV transparent varnish brushed layer 3, replacing the original aluminum-plated brushed technology, so that the salt spray resistance of the metal brushed PET product can reach the national standard 240-hour salt spray test.

[0087] This embodiment also provides a method for preparing a film-coated plate with a metal brushed effect, comprising the following steps:

[0088] Step 1: Print a brushed pattern on the surface of the base film 1 with transparent varnish, and then cure it with UV light to form a UV transparent varnish brushed layer 3.

[0089] Step 2: Full-print the water-based silver ink on the side of the UV transparent varnish drawing layer 3 facing away from the base film 1, and the water-based silver ink becomes a silver powder layer 4 after printing.

[0090] The UV transparent varnish brushed layer 3 and the full silver powder layer 4 are used as a foil to enhance the overall delicate metal effect.

[0091] Step 3: Apply the adhesive roller to the side of the silver powder layer 4 away from the UV transparent varnish drawing layer 3, and the adhesive becomes the adhesive layer 5 after curing.

[0092] Step 4: Roll-coat the light-curing material on the side of the base film 1 away from the UV transparent varnish drawing layer 3, and form a UV light-curing layer 2 through UV light curing.

[0093] The composite membrane is prepared through the above steps.

[0094] Step 5: Paste the composite film on the surface of the substrate to obtain a laminated board with a metal brushed effect.

[0095] Example 2

[0096] A coated plate with a metal brushed effect, which is different from Example 1 in that the specific content of each component in the aqueous silver ink is different, see Table 1 for details.

[0097] The dispersant is sodium succinate sulfonate and polyethylene glycol fatty acid ester, and the mass ratio of sodium succinate sulfonate and polyethylene glycol fatty acid ester is 1:0.8.

[0098] The silver powder is a mixture of 0.01-0.05 μm silver powder and 0.1-0.3 μm silver powder, and the mass ratio of the 0.01-0.05 μm silver powder and the 0.1-0.3 μm silver powder is 1:0.1.

[0099] The preparation method of water-based silver ink comprises the following steps:

[0100] Step a: Put coconut shell fiber and jute fiber into a pulverizer and chop them into 50 μm.

[0101] Water, silver powder, dispersant, coconut shell fiber and jute fiber were mixed and treated at an ultrasonic frequency of 25 KHz for 20 minutes.

[0102] Then, the mixture was stirred and mixed at a rotation speed of 2000 r / min for 35 min to obtain a first mixture.

[0103] Step b: Stir and mix the silver powder, the film-forming resin and the first mixture at a speed of 1500 r / min and a temperature of 95° C. for 40 minutes to obtain a second mixture.

[0104] Step c: adding the remaining raw materials to the second mixture and mixing for 40 minutes to obtain aqueous silver ink.

[0105] Example 3

[0106] A coated plate with a metal brushed effect, which is different from Example 1 in that the specific content of each component in the aqueous silver ink is different, see Table 1 for details.

[0107] The dispersant is sodium succinate sulfonate and polyethylene glycol fatty acid ester, and the mass ratio of sodium succinate sulfonate and polyethylene glycol fatty acid ester is 1:1.2.

[0108] The silver powder is a mixture of 0.01-0.05 μm silver powder and 0.1-0.3 μm silver powder, and the mass ratio of the 0.01-0.05 μm silver powder and the 0.1-0.3 μm silver powder is 1:0.3.

[0109] The preparation method of water-based silver ink comprises the following steps:

[0110] Step a: Put coconut shell fiber and jute fiber into a pulverizer and chop them into 100 μm.

[0111] Water, silver powder, dispersant, coconut shell fiber and jute fiber were mixed and treated at an ultrasonic frequency of 35 KHz for 10 minutes.

[0112] Then, the mixture was stirred and mixed at a rotation speed of 2500 r / min for 25 min to obtain a first mixture.

[0113] Step b: Stir and mix the silver powder, the film-forming resin and the first mixture at a speed of 2000 r / min and a temperature of 105° C. for 30 minutes to obtain a second mixture.

[0114] Step c: adding the remaining raw materials to the second mixture and mixing for 30 minutes to obtain aqueous silver ink.

[0115] Example 4

[0116] A coated plate with a metal brushed effect, which is different from Example 1 in that the dispersant in the aqueous silver ink is sodium succinate sulfonate.

[0117] Example 5

[0118] A coated plate with a metal brushed effect, which is different from Example 1 in that the mass ratio of sodium succinate sulfonate to polyethylene glycol fatty acid ester in the aqueous silver ink is 1:2.

[0119] Example 6

[0120] A coated plate with a metal brushed effect, which is different from Example 1 in that the silver powder in the water-based silver ink is 0.01-0.05 μm silver powder.

[0121] Table 1

[0122]

[0123] Comparative Example 1

[0124] A film-coated board with a metal brushed effect, which is different from Example 1 in that coconut shell fiber is replaced by hydroxyethyl cellulose.

[0125] Comparative Example 2

[0126] A film-faced board with a metal brushed effect, which is different from Example 1 in that jute fiber is replaced by coconut shell fiber.

[0127] Comparative Example 3

[0128] A coated plate with a metal brushed effect, which is different from Example 1 in that the dispersant is sodium dodecyl sulfate.

[0129] Comparative Example 4

[0130] A film-coated plate with a metal brushed effect, which is different from Example 1 in that sodium succinate sulfonate is replaced by sodium dodecyl sulfate.

[0131] Comparative Example 5

[0132] A film-coated board with a metal brushed effect, which is different from Example 1 in that coconut shell fiber, jute fiber and dispersant are replaced by water.

[0133] Performance testing

[0134] 1. Stability of water-based silver ink:

[0135] The aqueous silver inks prepared in Examples 1-6 and Comparative Examples 1-5 were placed in a transparent container and stored at 50±2°C for 30 days for stability testing with reference to GB / T6753.3-1986 "Test method for storage stability of coatings". The evaluation results of the sedimentation degree and the viscosity change value are recorded in Table 2.

[0136] (1) Assessment of settlement degree:

[0137] 10: Completely suspended. No change compared to the original state of the paint.

[0138] 8: There is a noticeable sense of sedimentation and a small amount of deposited pigment appears on the palette knife. There is no noticeable resistance when pushing with the palette knife.

[0139] 6: There are obvious settled pigment lumps. The weight of the spatula can penetrate the pigment lumps and fall to the bottom of the container. There is a certain resistance when pushing with the spatula. The lumps of the condensed part can be transferred to the spatula.

[0140] 4: The weight of the spatula cannot fall to the bottom of the container. It is difficult to push the spatula through the paint block, and there is a slight resistance when pushing the spatula along the edge of the can. However, the paint can be easily remixed into a uniform state.

[0141] 2: When the spatula is forced to penetrate the pigment sedimentation layer, it is difficult to push with the spatula surface, and there is obvious resistance when pushing the spatula blade along the edge of the can. However, the paint can be remixed into a uniform state.

[0142] 0: Formed into very hard lumps. These lumps cannot be remixed with the liquid into a uniform paint by manual stirring within 3-5 minutes.

[0143] (2) Evaluation of viscosity change value:

[0144] 10: Viscosity change value, no more than 5%;

[0145] 8: Viscosity change value, no more than 15%;

[0146] 6: Viscosity change value, no more than 25%;

[0147] 4: Viscosity change value, no more than 35%;

[0148] 2: Viscosity change value, no more than 45%;

[0149] 0: Viscosity change value, greater than 45%.

[0150] The final evaluation of this standard is conclusive with "pass" or "fail". When all the evaluations are "0" or only 2.3.4 is evaluated as "0", the sample is considered "failed". In other cases, it is "passed" or evaluated according to product requirements. However, the storage stability of each sample can be relatively compared based on the rating scores of each item.

[0151] Table 2

[0152]

[0153] Comparative Examples 1-2 are based on Example 1, only one fiber is used or other fibers are used as substitutes; Comparative Examples 3-4 are based on Example 1, the choice of dispersant is changed; Comparative Example 5 is based on Example 1, coconut shell fiber, jute fiber, and dispersant are omitted. According to the test data in Table 2, the aqueous silver ink of Examples 1-6 has a good suspension effect, a small viscosity change, and a high stability. The sedimentation degree of the aqueous silver ink of Comparative Examples 1-5 is more obvious than that of Examples 1-6, and the viscosity change is also greater than that of Examples 1-6. It shows that the aqueous silver ink composed of special coconut shell fiber, jute fiber, dispersant and other raw materials can indeed make the silver powder have a good suspension effect under coordinated cooperation, and the performance of the aqueous silver ink is stable. If this special combination is destroyed at will, it is impossible to achieve an aqueous silver ink with significant performance.

[0154] Examples 4 and 5 changed the selection and dosage of the dispersant within a certain range, and Example 6 changed the various particle size combinations of the silver powder. According to the test data in Table 2, the performance of Examples 4-6 is somewhat lower than that of Example 1, but is still at a good level. This shows that if the specific selection and specific dosage combination of the dispersant and the various particle size combinations of the silver powder can be further limited, the suspension and stability of the water-based silver ink can be further improved.

[0155] 2. Appearance of film-faced board:

[0156] Observe with naked eyes whether the coated boards with metal brushed effect of Examples 1-6 and Comparative Examples 1-5 have silver powder aggregation and whether the metallic feel is significant, which is the initial effect.

[0157] Then place the coated board with metal brushed effect in an aging test chamber for 30 days. The storage conditions are: temperature 50±2℃, humidity 95±2%, UV lamp power 2500W, and spectrum wavelength range 500nm. After taking it out, observe the coated board with metal brushed effect with naked eyes again to see if there is silver powder aggregation and whether the metallic feeling is obvious. This is the effect after treatment.

[0158] The results are recorded in Table 3.

[0159] Table 3

[0160]

[0161] According to the test data in Table 3, the film-covered boards of Examples 1-6 all showed excellent visual effects at the beginning and maintained good stability after treatment. The film-covered boards of Comparative Examples 1-4 also had good initial effects, but their stability after treatment was not as good as that of Examples 1-6.

[0162] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A laminated board with a metal brushed effect, characterized in that: It includes a composite film and a substrate, wherein the composite film is bonded to the surface of the substrate; The composite film comprises a base film (1), one side of the base film (1) is provided with a UV light curing layer (2), and the other side of the base film (1) is provided with a UV transparent varnish drawing layer (3), a silver powder layer (4), and a back glue adhesion layer (5) in sequence; UV transparent varnish brushed layer (3) uses commercially available transparent varnish to print brushed patterns; The silver powder layer (4) is printed by water-based silver ink, and comprises the following components according to the mass percentage of the water-based silver ink: 15-25% silver powder, 20-30% film-forming resin, 0.5-2% dispersant, 0.1-1% defoamer, 0.1-1% coconut shell fiber, 0.1-1% jute fiber, and water; the film-forming resin is a water-based acrylic resin emulsion; the silver powder is a mixture of 0.01-0.05 μm silver powder and 0.1-0.3 μm silver powder, and the mass ratio of 0.01-0.05 μm silver powder to 0.1-0.3 μm silver powder is 1:(0.1-0.3); The dispersant is sodium succinate sulfonate and polyethylene glycol fatty acid ester, and the mass ratio of sodium succinate sulfonate and polyethylene glycol fatty acid ester is 1: (0.8-1.2); the polyethylene glycol fatty acid ester is polyethylene glycol 200 monolaurate.

2. The film-coated laminate with metal brushed effect according to claim 1, characterized in that: According to the mass percentage of the aqueous silver ink, the coconut shell fiber is 0.7-1%, and the jute fiber is 0.1-0.3%.

3. The film-coated laminate with metal brushed effect according to claim 1, characterized in that: The UV light-curing layer is formed by curing a light-curing material, and the light-curing material includes a mixture of one or more of polyester acrylate, epoxy acrylate, and polyurethane acrylate.

4. The film-coated laminate with metal brushed effect according to claim 1, characterized in that: The thickness of the silver powder layer is 300-500nm.

5. A method for preparing a film-coated laminate with a metal wire drawing effect according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: Printing a brushed pattern on the surface of a base film (1) with a transparent varnish, and then curing with UV light to form a UV transparent varnish brushed layer (3); Step 2: Full-printing water-based silver ink on the side of the UV transparent varnish drawing layer (3) facing away from the base film (1), and the water-based silver ink becomes a silver powder layer (4) after printing; Step 3: Apply the adhesive roller to the side of the silver powder layer (4) away from the UV transparent varnish drawing layer (3), and the adhesive becomes an adhesive layer (5) after curing; Step 4: Roll-coating a light-curing material on the side of the base film (1) away from the UV transparent varnish drawing layer (3), and forming a UV light-curing layer (2) through UV light curing; A composite membrane is prepared by the above steps; Step 5: Paste the composite film on the surface of the substrate to obtain a coated board with a metal brushed effect; The preparation method of aqueous silver ink comprises the following steps: Step a: mixing water, silver powder, dispersant, coconut shell fiber and jute fiber, treating them at an ultrasonic frequency of 25-35 kHz for 10-20 minutes, and then stirring and mixing them at a speed of 2000-2500 r / min for 25-35 minutes to obtain a first mixture; Step b: stirring and mixing the silver powder, the film-forming resin and the first mixture at a speed of 1500-2000 r / min and a temperature of 95-105° C. to obtain a second mixture; Step c: mixing the remaining raw materials with the second mixture to obtain aqueous silver ink.

6. The method for preparing a film-coated laminate with a metal wire drawing effect according to claim 5, characterized in that: The coconut shell fiber and jute fiber are chopped into 50-100 μm before being mixed with water, silver powder and dispersant in step a.

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