Multifunctional metal texture embossed printing ink and preparation method thereof

Abstract

The invention relates to the technical field of functional ink, and discloses multifunctional metal texture embossed ink and a preparation method thereof, the multifunctional metal texture embossed ink comprises metal powder, a resin base material, a solvent, a thickening agent, a nano functional material and an auxiliary agent, and the nano functional material comprises at least two of nano TiO, ZnO, fluorescent quantum dots, nano silver and copper oxide. The multifunctional metal embossed printing ink can realize multiple functions of metallic luster, touch embossment, antibiosis, fluorescent falsification prevention, ultraviolet resistance and the like through single-layer printing ink, reduces the complexity of a traditional multi-layer stacking process through gradient thickening and UV / thermal dual curing, is suitable for the fields of game cards, high-end packages, anti-counterfeiting marks, intelligent cards, decorative materials and the like, and has wide application prospects. The anti-counterfeiting ink is especially suitable for scenes requiring both tactile feedback and visual impact, the projection height is controllable, the touch feeling is remarkable, nano materials have a synergistic effect, the fluorescence response can be customized, the anti-counterfeiting ink is suitable for dynamic anti-counterfeiting scenes, the use amount of a solvent is reduced by 20%, and the RoHS standard is met.

Description

Technical Field

[0001] The present invention relates to the technical field of functional inks, in particular to a multifunctional metallic-texture embossed ink and a preparation method thereof. Background Art

[0002] Traditional metallic inks often achieve a glossy effect by adding metal powders (such as aluminum and copper powders). However, these inks are limited in functionality and lack the ability to create tactilely noticeable raised structures. Existing embossing inks often rely on physical embossing or multiple printing steps, which present complex processes, high costs, poor adhesion, and easy wear.

[0003] In addition, in existing technologies, single-function inks are difficult to meet the market demand for multifunctional integration, such as: 1. Anti-counterfeiting: Multiple verification methods such as vision (metallic luster), touch (convexity), and optics (fluorescence) are required; 2. Medical device packaging: must have both antibacterial properties and durability; 3. Outdoor signs: need to be resistant to UV aging. Summary of the Invention

[0004] The purpose of the present invention is to provide a multifunctional metallic texture embossed ink and a preparation method thereof, which solves the above-mentioned problems through the synergistic effect of nanomaterial composite modification, gradient thickening technology and multifunctional additives, and realizes efficient production through a one-step printing and molding process.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a multifunctional metallic texture embossed ink, comprising metal powder, a resin base, a solvent, a thickener, a nano-functional material and an additive, wherein the nano-functional material comprises at least two of nano-TiO, ZnO, fluorescent quantum dots, nano-silver and copper oxide.

[0006] Preferably, the particle size of the metal powder is distributed in a gradient of 1-10 μm, and the mass proportion is 15-35%.

[0007] Preferably, the thickener is a compound system of fumed silica and hydroxyethyl cellulose, accounting for 2-5% by mass, and the mass ratio of fumed silica to hydroxyethyl cellulose is (1:0.2)-(1:1).

[0008] Preferably, the fluorescent quantum dots are of CdSe / ZnS core-shell structure, with an excitation wavelength of 365 nm and an adjustable emission wavelength range of 450-650 nm.

[0009] Preferably, the resin base material is a mixture of polyurethane-acrylic composite resin and epoxy-modified silicone resin, with a mass ratio of (3:1) to (1:1).

[0010] A method for preparing a multifunctional metallic embossed ink comprises the following steps: Step 1: Pre-dispersion mixing a. Mix metal powder, nano-TiO2 / ZnO, nano-silver / copper oxide with 1 / 3 solvent, add dispersant BYK-111, and use a high-speed shear emulsifier at a speed of 6000 rpm for 30 minutes to pre-disperse to form a uniform slurry; Step 2: Activation of resin base a. Mix the resin base with the remaining solvent, stir in a 50°C water bath until completely dissolved, add fluorescent quantum dots, and perform ultrasonic treatment in the dark to prevent quantum dot agglomeration; Step 3: Gradient thickening and compounding a. Mix the slurry from step 1 with the resin solution from step 2, and add the thickener three times with an interval of 5 minutes between each addition to control the viscosity between 5000-8000 cps.

[0011] b. Add leveling agent and defoaming agent, stir at low speed 300 rpm, and degas for 15 minutes to obtain the final ink; Step 4: Filtration and packaging a. Filter through a 5μm filter and store in a sealed container away from light.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. This multifunctional metallic embossed ink can achieve multiple functions such as metallic luster, tactile convexity, antibacterial, fluorescent anti-counterfeiting, and UV resistance in a single layer. Through gradient thickening and UV / thermal dual curing, it can be printed and formed in one step, reducing the complexity of traditional multi-layer stacking processes. It is suitable for game cards, high-end packaging, anti-counterfeiting labels, smart cards, decorative materials and other fields, especially for scenes requiring both tactile feedback and visual impact.

[0013] 2. This multifunctional metallic embossed ink has a controllable embossed height between 50μm and 150μm, a noticeable tactile feel, and the synergistic effect of nanomaterials increases wear resistance by more than 3 times. The fluorescent response can be customized, making it suitable for dynamic anti-counterfeiting scenarios. It reduces solvent usage by 20% and complies with RoHS standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of ink composition. DETAILED DESCRIPTION

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0016] See also Figure 1 The present invention provides a technical solution: a multifunctional metallic texture embossed ink, comprising metal powder, a resin base material, a solvent, a thickener, a nano-functional material and an additive, wherein the nano-functional material comprises at least two of nano-TiO, ZnO, fluorescent quantum dots, nano-silver and copper oxide.

[0017] like Figure 1 As shown, the particle size of the metal powder is gradiently distributed in the range of 1-10 μm, and accounts for 15-35% by mass. The metal powder is aluminum powder, copper powder or pearl powder, which provides metallic luster, and the particle size gradient distribution enhances the light reflection effect.

[0018] like Figure 1 As shown, the thickener is a compound system of fumed silica and hydroxyethyl cellulose, with a mass ratio of 2-5%, and the mass ratio of fumed silica to hydroxyethyl cellulose is (1:0.2)-(1:1). The fumed silica has strong thixotropy.

[0019] like Figure 1 As shown, the fluorescent quantum dots are of CdSe / ZnS core-shell structure, with an excitation wavelength of 365 nm and an emission wavelength adjustable in the range of 450-650 nm.

[0020] like Figure 1 As shown, the resin base material is a mixture of polyurethane-acrylic composite resin and epoxy-modified silicone resin, with a mass ratio of (3:1)-(1:1). The resin base material is polyurethane-acrylic composite resin with strong weather resistance, and the epoxy-modified silicone has strong flexibility.

[0021] According to another aspect of the present invention, a method for preparing a multifunctional metallic embossed ink is provided, comprising the following steps: Step 1: Pre-dispersion mixing a. Mix metal powder, nano-TiO2 / ZnO, nano-silver / copper oxide with 1 / 3 solvent, add dispersant (BYK-111), and pre-disperse using a high-speed shear emulsifier (speed 6000 rpm, 30 min) to form a uniform slurry; Step 2: Activation of resin base a. Mix the resin base with the remaining solvent and stir in a 50°C water bath until completely dissolved. Add fluorescent quantum dots and ultrasonicate (40 kHz, 10 min) in the dark to prevent quantum dot agglomeration. Step 3: Gradient thickening and compounding a. Mix the slurry from step 1 with the resin solution from step 2, and add the thickener (fumed silica + hydroxyethyl cellulose) three times, with an interval of 5 minutes between each addition, to control the viscosity at 5000-8000 cps (25°C).

[0022] b. Add leveling agent and defoaming agent, stir at low speed (300 rpm, 15 min) to degas, and obtain the final ink; Step 4: Filtration and packaging a. Filter through a 5μm filter and store in a sealed container away from light.

[0023] Application process (screen printing example) 1. Substrate pretreatment: plasma cleaning (power 100W, time 30s) to improve adhesion.

[0024] 2. Printing parameters: mesh number 200-300 mesh, scraper angle 60°, pressure 0.3MPa, printing speed 10m / min.

[0025] Curing process: 1. The first stage: UV pre-curing (wavelength 365nm, intensity 80mW / cm², time 3s) for initial shaping; 2. The second stage: thermal curing (80℃ / 10min) to completely cross-link the resin, and the protrusion height can reach 50-150μm.

[0026] Example 1 (Ink for Anti-Counterfeiting Labels) 1. Recipe: Aluminum powder (particle size 5μm): 25%; Polyurethane-acrylic composite resin: 35%; PMA: 30%; Nano-TiO2 (20nm): 3%; CdSe / ZnS quantum dots (emission wavelength 520nm): 2%; Nanosilver (10nm): 1%; Thickener (fumed SiO2 2% + hydroxyethyl cellulose 1%): 3%; Additives (BYK-1111%+TEGOGlide4100.5%+BYK-0280.5%): 2%.

[0027] 2. Performance test: Bump height: 120 μm (measured by laser profilometer); Wear resistance: No peeling after 500 frictions under 1kg load (ASTM D4060); Antibacterial rate: 99.95% antibacterial rate against Escherichia coli (ISO22196); Fluorescence intensity: Brightness after excitation ≥300cd / m² (spectrophotometer detection).

[0028] Example 2 (Ink for outdoor marking) 1. Recipe: Copper powder (particle size 8μm): 30%; Epoxy modified silicone resin: 40%; Ethanol: 25%; Nano ZnO (50nm): 4%; Thickener (fumed SiO2 3% + hydroxyethyl cellulose 2%): 5%; Additives (BYK-1111.5% + TEGOGlide4101%): 2.5%.

[0029] 2. Performance test: UV resistance: QUV aging 500h, ΔE≤1.5 (colorimeter); Flexibility: No cracks after 180° bending (ASTM D522); Outdoor durability: After 100 hours of rain, the raised structure is intact.

[0030] Through the above design, the present invention is significantly superior to the existing technology in terms of functionality, process efficiency and cost control, and can meet the diversified needs of the high-end market.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

[0032] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the protection content of the present invention.

[0033] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multifunctional metallic texture embossed ink, characterized in that: The invention comprises metal powder, resin base material, solvent, thickener, nano-functional material and additives, wherein the nano-functional material comprises at least two of nano-TiO, ZnO, fluorescent quantum dots, nano-silver and copper oxide.

2. The multifunctional metallic embossed ink according to claim 1, characterized in that: The particle size of the metal powder is distributed in a gradient of 1-10 μm, and the mass proportion is 15-35%.

3. The multifunctional metallic embossed ink according to claim 1, characterized in that: The thickener is a compound system of fumed silica and hydroxyethyl cellulose, accounting for 2-5% by mass, and the mass ratio of fumed silica to hydroxyethyl cellulose is (1:0.2)-(1:1).

4. The multifunctional metallic embossed ink according to claim 1, characterized in that: The fluorescent quantum dots are of CdSe / ZnS core-shell structure, with an excitation wavelength of 365 nm and an adjustable emission wavelength range of 450-650 nm.

5. The multifunctional metallic embossed ink according to claim 1, characterized in that: The resin base material is a mixture of polyurethane-acrylic composite resin and epoxy-modified silicone resin, with a mass ratio of (3:1) to (1:1).

6. A method for preparing a multifunctional metallic embossed ink, applied to the multifunctional metallic embossed ink according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: Pre-dispersion mixing a. Mix metal powder, nano-TiO2 / ZnO, nano-silver / copper oxide with 1 / 3 solvent, add dispersant BYK-111, and use a high-speed shear emulsifier at a speed of 6000 rpm for 30 minutes to pre-disperse to form a uniform slurry; Step 2: Activation of resin base a. Mix the resin base with the remaining solvent, stir in a 50°C water bath until completely dissolved, add fluorescent quantum dots, and perform ultrasonic treatment in the dark to prevent quantum dot agglomeration; Step 3: Gradient thickening and compounding a. Mix the slurry from step 1 with the resin solution from step 2, then add the thickener three times, 5 minutes apart each time, to control the viscosity between 5000-8000 cps. b. Add the leveling agent and defoamer, stir at a low speed of 300 rpm, and degas for 15 minutes to obtain the final ink. Step 4: Filtration and packaging a. Filter through a 5μm filter and store in a sealed container away from light.

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