UV metal ink for specialty paper, preparation method of UV metal ink and printed product

Abstract

The invention provides UV metal ink for specialty paper, a preparation method of the UV metal ink and a printed product. The UV metal ink is prepared from the following raw materials in percentage by mass: 35 to 45 weight percent of acrylic UV resin, 20 to 25 weight percent of 1, 6-hexanediol diacrylate, 5 to 15 weight percent of epoxy acrylic resin, 5 to 15 weight percent of trimethylolpropane triacrylate, 5 to 15 weight percent of nanoscale UV mirror-like silver paste, 0.5 to 1.5 weight percent of polyethylene wax, 5.5 to 6.5 weight percent of photosensitizer, 0.5 to 1.5 weight percent of heat stabilizer, 0.3 to 0.6 weight percent of defoaming agent and 0.5 to 1.5 weight percent of flatting agent. Wherein the molecular weight of the acrylic acid UV resin is 30000 to 80000. The acrylic UV resin with high flexibility and adhesive force is used, and the nanoscale UV mirror-like silver paste, the photosensitizer, the flatting agent and the defoaming agent are added, so that the obtained UV metal ink has high adhesive force, good printing adaptability and strong metal feeling, and is suitable for embossing and denting processes.

Description

Technical Field

[0001] The present application relates to the field of ink technology, and in particular to a UV metallic ink for special paper, a preparation method thereof, and printed products. Background Art

[0002] As a green, high-quality and innovative printing material, UV metallic ink is gradually emerging in the market. Compared with the traditional hot stamping process, metallic ink has significant advantages. In particular, the screen printing method, its flexible printing method can be applied to most substrates, with low cost, environmental protection and no plasticization, which plays a very important role in reducing costs and increasing efficiency. UV metallic ink has been used in large quantities in most packaging products, such as wine packaging, cigarette packaging, medicine packaging, daily chemicals, electronic products and other fields.

[0003] However, existing UV metallic inks still have some disadvantages, especially it is very difficult to print metallic inks on special paper. Printing UV metallic inks on special paper has a series of problems such as poor adhesion of UV metallic inks, easy ink loss during debossing or embossing, insufficient metallic feel, and easy blurring or jagged shapes.

[0004] The contents of the background technology section are merely the technologies known to the inventors and do not necessarily represent the prior art in the field. Summary of the invention

[0005] In view of at least one problem of the above-mentioned prior art, the first aspect of the present application provides a UV metallic ink for special paper, comprising the following raw materials in percentage by mass:

[0006] 35-45wt% acrylic UV resin, 20-25wt% 1,6-hexanediol diacrylate, 5-15wt% epoxy acrylic resin, 5-15wt% trimethylolpropane triacrylate, 5-15wt% nano-scale UV mirror silver paste, 0.5-1.5wt% polyethylene wax, 5.5-6.5wt% photosensitizer, 0.5-1.5wt% heat stabilizer, 0.3-0.6wt% defoamer and 0.5-1.5wt% leveling agent;

[0007] Wherein, the molecular weight of the acrylic UV resin is 30,000-80,000.

[0008] In some embodiments of the present application, the acrylic UV resin comprises one or more of a pure acrylic UV resin, an inert pure acrylic UV resin mixture, and an inert methacrylic UV resin mixture;

[0009] The epoxy acrylic resin includes one or more of bisphenol A epoxy acrylate with an average functionality greater than 2, rosin-modified epoxy acrylic resin, long-chain fatty acid-modified epoxy acrylic resin, anhydride-modified epoxy acrylate oligomer, and amine-modified epoxy acrylate oligomer.

[0010] In some embodiments of the present application, the photosensitizer includes one or more of benzophenone, 2-methyl-1-[4-methylthiophenyl]-2-morpholinyl-1-propanone, N-(ethoxycarbonylphenyl)-N'-methyl-N'-phenylformamidine, bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate, 2,4,6(trimethylbenzoyl)diphenylphosphine oxide, isopropylthioxanthine (mixture of 2, 4 isomers), 2,4-diethylthioxanthine and 1-hydroxy-cyclohexyl-phenyl ketone;

[0011] The leveling agent includes one or more of polyether siloxane copolymer, silicone acrylate, polyether modified polydimethylsiloxane, and fluorine modified polyether siloxane copolymer;

[0012] The defoaming agent includes one or more of polyether silicone copolymers, silicones, acrylate modified copolymers, etc.;

[0013] The heat stabilizer includes one or more of tri(N-nitroso-N-phenylhydroxylamine)aluminum salt, 2-phenol ethoxy acrylate, ethoxy mono-oil triacrylate, p-hydroxyanisole and hydroquinone.

[0014] In some embodiments of the present application, the particle size of the nano-scale UV mirror silver paste is 0.1-3 μm, and the fineness of the UV metal ink is less than 15 μm.

[0015] In some embodiments of the present application, when the substrate is black cardboard, the glossiness of the UV metallic ink after printing is above 90° in a 60° angle test.

[0016] A second aspect of the present application provides a method for preparing any of the above-mentioned UV metallic inks, comprising the following steps:

[0017] S1: Mix acrylic UV resin, 1,6-hexanediol diacrylate, epoxy acrylic resin, trimethylolpropane triacrylate, nano-grade UV mirror silver paste, polyethylene wax, photosensitizer, heat stabilizer, defoamer and leveling agent evenly and place for a predetermined time to completely eliminate the foam of the mixed pigment;

[0018] S2: Grinding the mixed pigment after being placed for the predetermined time, so that the mixed pigment reaches a predetermined fineness.

[0019] In some embodiments of the present application, the predetermined time is greater than 2 hours, and the predetermined fineness is less than 15 μm.

[0020] A third aspect of the present application provides a printed product, the surface of which has patterns and / or texts printed by any of the above-mentioned UV metallic inks.

[0021] In some embodiments of the present application, the printed product is printed by silk screen printing.

[0022] In some embodiments of the present application, the substrate of the printed product is black cardboard and / or kraft paper.

[0023] The present invention uses acrylic UV resin with high flexibility and adhesion, and simultaneously adds nano-level UV mirror silver paste, photosensitizer, leveling agent and defoamer, so that the obtained UV metallic ink has high adhesion, good printing adaptability, strong metallic feel, and is suitable for embossing and debossing processes. Moreover, the UV metallic ink provided by the present invention can be suitable for all special papers, including kraft paper and black cardboard, and has wide reproducibility.

[0024] Moreover, the shelf life of existing UV metallic inks is very short, generally only 1 to 3 months, and some even need to be refrigerated, but the UV metallic ink provided by the present application has a longer shelf life and can be stored for 1 to 2 years at room temperature. Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of the present disclosure are used to provide a further understanding of the present disclosure. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure. In the drawings:

[0026] Figure 1 The figure is a schematic diagram of a process flow for preparing UV metallic ink according to an embodiment of the present invention.

[0027] Figure 2 This is the pattern printed in Example 1 of the present invention.

[0028] Figures 3 to 5 These are the patterns printed in Comparative Examples 1 to 3 of the present invention. DETAILED DESCRIPTION

[0029] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0030] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0031] As used herein, "about" or "approximately" includes the stated value and means within an acceptable range of deviation from the particular value as determined by one skilled in the art, taking into account the measurement in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations, or within ±30%, ±20%, ±10%, or ±5% of the stated value.

[0032] The following is a more detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings and examples, so that the scheme of the present invention and its advantages in various aspects can be better understood. However, the specific embodiments and examples described below are only for the purpose of illustration, rather than for limiting the present invention.

[0033] The UV metallic ink for special paper provided in the present application includes the following raw materials: acrylic UV resin, 1,6-hexanediol diacrylate, epoxy acrylic resin, trimethylolpropane triacrylate, nano-scale UV mirror silver paste, polyethylene wax, photosensitizer, heat stabilizer, defoamer and leveling agent.

[0034] Among them, in UV metal ink, the mass percentage of acrylic UV resin is 35-45wt%. The acrylic UV resin used in this application is a polymer material, which can optionally contain one or more of pure acrylic UV resin, inert pure acrylic UV resin mixture, and inert methacrylic UV resin mixture. Its molecular weight is 30000-80000. Due to its large molecular weight and modified properties, it provides a good cohesive effect, which can make the ink coating obtain a better anti-diffusion effect, and the flexibility and adhesion of acrylic UV resin are very strong. In some specific embodiments, the mass percentage of acrylic UV resin can be 35wt%, 36wt%, 37wt%, 38wt%, 39wt%, 40wt%, 41wt%, 42wt%, 43wt%, 44wt% or 45wt%.

[0035] The mass percentage of 1,6-hexanediol diacrylate is 20-25wt%. 1,6-hexanediol diacrylate mainly plays the role of diluent in this application. In some specific embodiments, the mass percentage of 1,6-hexanediol diacrylate can be 20wt%, 21wt%, 22wt%, 23wt%, 24wt% or 25wt%.

[0036] The mass percentage of epoxy acrylic resin is 5-15wt%. Epoxy acrylic resin mainly plays the role of light curing in the present invention. Optionally, epoxy acrylic resin includes one or more of bisphenol A epoxy acrylate with an average functionality greater than 2, rosin-modified epoxy acrylic resin, long-chain fatty acid-modified epoxy acrylic resin, anhydride-modified epoxy acrylate oligomer, and amine-modified epoxy acrylate oligomer. In some specific embodiments, the mass percentage of epoxy acrylic resin can be 5wt%, 7wt%, 9wt%, 11wt%, 13wt% or 15wt%.

[0037] The mass percentage of trimethylolpropane triacrylate is 5-15wt%. Trimethylolpropane triacrylate mainly acts as a diluent in the present invention. In some specific embodiments, the mass percentage of trimethylolpropane triacrylate can be 5wt%, 7wt%, 9wt%, 11wt%, 13wt% or 15wt%.

[0038] The mass percentage of nano-scale UV mirror silver paste is 5 to 15wt%. In the present application, the nano-scale UV mirror silver paste is a high-brightness mirror silver paste produced by a unique vacuum coating process (VMPs) using high-purity aluminum as raw material. The surface is treated by a special surface treatment process, and the flake thickness reaches the nanometer level, which is more than 10 times thinner than the traditional ball milling method. The ideal mirror metal effect can be achieved with a small amount. Since the silver paste used is treated, its glossiness is very good, so the glossiness of the prepared UV metallic ink is also very good. Optionally, the particle size of the nano-scale UV mirror silver paste is 0.1 to 3μm, and the smaller the particle size, the better the performance of the ink. In some specific embodiments, the mass percentage of the nano-scale UV mirror silver paste may be 5wt%, 7wt%, 9wt%, 11wt%, 13wt% or 15wt%.

[0039] The mass percentage of the polyethylene wax is 0.5-1.5wt%. The polyethylene wax in the present invention mainly plays a rheological role of lubrication and wear resistance as well as a certain anti-sagging. In some specific embodiments, the mass percentage of the polyethylene wax can be 0.5wt%, 0.7wt%, 0.9wt%, 1.1wt%, 1.3wt% or 1.5wt%.

[0040] The mass percentage of the photosensitizer is 5-7wt%. In some specific embodiments, the mass percentage of the photosensitizer may be 5wt%, 5.5wt%, 6wt%, 6.5wt% or 7wt%. Optionally, the photosensitizer is TPO-L and 1-hydroxy-cyclohexyl-phenyl ketone (184). Optionally, the photosensitizer includes benzophenone, 2-methyl-1-[4-methylthiophenyl]-2-morpholinyl-1-propanone, N-(ethoxycarbonylphenyl)-N'-methyl-N'-phenylformamidine, bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, 2,4,6(trimethylbenzoyl)diphenylphosphine oxide, isopropylthioxanthine (mixture of 2, 4 isomers), 2,4-diethylthioxanthine and 1-hydroxy-cyclohexyl-phenyl ketone. One or more.

[0041] The mass percentage of the heat stabilizer is 0.5-1.5wt%. The heat stabilizer mainly plays a role in improving the storage stability of the ink in the present invention. Optionally, the heat stabilizer includes one or more of tris(N-nitroso-N-phenylhydroxylamine)aluminum salt, 2-phenol ethoxy acrylate, ethoxy mono-oil triacrylate, p-hydroxyanisole and hydroquinone. In some specific embodiments, the mass percentage of the heat stabilizer can be 0.5wt%, 0.7wt%, 0.9wt%, 1.1wt%, 1.3wt% or 1.5wt%. Optionally, the model of the heat stabilizer is tris(N-nitroso-N-phenylhydroxylamine)aluminum salt.

[0042] The mass percentage of the defoamer is 0.3-0.6wt%. The main function of the defoamer is to eliminate bubbles generated during the screen printing process. Optionally, the defoamer includes one or more of polyether silicone copolymers, silicones, acrylate modified copolymers, etc. In some specific embodiments, the mass percentage of the defoamer may be 0.3wt%, 0.4wt%, 0.5wt% or 0.6wt%. Optionally, the defoamer is selected from Shin-Etsu's silicone defoamer KS-66.

[0043] The mass percentage of the leveling agent is 0.5-1.5wt%. The leveling agent in the present invention mainly plays the role of leveling, preventing and eliminating ink shrinkage holes and producing orange peel and other adverse effects. Optionally, the leveling agent includes one or more of polyether siloxane copolymers, silicone acrylates, polyether modified polydimethylsiloxanes, and fluorine-modified polyether siloxane copolymers. In some specific embodiments, the mass percentage of the leveling agent may be 0.5wt%, 0.7wt%, 0.9wt%, 1.1wt%, 1.3wt% or 1.5wt%.

[0044] Optionally, when the substrate is black cardboard, the glossiness of the UV metallic ink after printing is 90° (60° angle test).

[0045] Optionally, the fineness of the UV metallic ink is less than 15 μm. The finer the fineness, the stronger the metallic feeling.

[0046] Optionally, the solid content of the UV metallic ink provided in the present application is above 92%.

[0047] The present invention uses acrylic UV resin with high flexibility and adhesion, and simultaneously adds nano-level UV mirror silver paste, photosensitizer, leveling agent and defoamer, so that the obtained UV metallic ink has high adhesion, good printing adaptability, strong metallic feel, and is suitable for embossing and debossing processes. Moreover, the UV metallic ink provided by the present invention can be suitable for all special papers, including kraft paper and black cardboard, and has wide reproducibility.

[0048] Moreover, the shelf life of existing UV metallic inks is very short, generally only 1 to 3 months, and some even need to be refrigerated, but the UV metallic ink provided in this application has a longer shelf life and can be stored at room temperature for 1 to 2 years.

[0049] Figure 1 A method for preparing the above-mentioned UV metallic ink provided in an embodiment of the present application is shown, comprising the following steps S1 and S2.

[0050] S1: Mix acrylic UV resin, 1,6-hexanediol diacrylate, epoxy acrylic resin, trimethylolpropane triacrylate, nano-grade UV mirror silver paste, polyethylene wax, photosensitizer, heat stabilizer, defoamer and leveling agent evenly and place for a predetermined time to completely eliminate the foam of the mixed pigment.

[0051] Optionally, a planetary mixer is used for stirring. Optionally, a planetary mixer is used to stir the above raw materials for 20 to 30 minutes, and the dispersion speed is adjusted to 600 to 1000 r / min until the raw materials are uniformly mixed.

[0052] Optionally, the predetermined time is greater than 2 hours. The mixture is allowed to stand for more than 2 hours until the foam is completely eliminated before grinding.

[0053] S2: Grinding the mixed pigment after being placed for a predetermined time to make the mixed pigment reach a predetermined fineness.

[0054] Optionally, a three-roll mill is used to grind at least 2 times so that the mixed pigment reaches a predetermined fineness. The pressure of the three-roll mill can be set according to the fineness requirement, and the fineness can be detected using a fineness meter. Optionally, the predetermined fineness is <15 μm.

[0055] The present application further provides a printed product, wherein the surface of the printed product has patterns and / or texts printed by any of the above-mentioned UV metallic inks.

[0056] Optionally, the printed product is printed on black cardboard and / or kraft paper, or other special paper. Optionally, the printing is performed by silk screen printing.

[0057] The printed product provided by the present invention does not drop ink. After debossing, the surface of the printed product is compacted with 3M610 tape, and the product is quickly pulled up vertically at 90 degrees without ink falling off. It can be seen that the UV metallic ink provided by the present invention has strong adhesion on the fiber. Moreover, the gloss of the printed product is very good, without pinholes or shrinkage holes, and the edge is not jagged and has no scattered ink. Since the ink used has high adhesion, good printing adaptability, strong metallic feel, and is suitable for embossing and debossing processes, the printed product obtained is very good in terms of color and adhesion.

[0058] The present invention is described below with reference to specific embodiments. The process condition values ​​taken in the following embodiments are all exemplary, and the possible numerical ranges are as shown in the above invention content. For process parameters not specifically noted, conventional techniques can be used. Unless otherwise specified, the detection methods used in the following embodiments are conventional detection methods in the industry. Unless otherwise specified, the reagents and instruments used in the technical solutions provided by the present invention can be purchased from conventional channels or the market.

[0059] Example

[0060] This embodiment prepares a printed product, whose substrate is black cardboard, and the specific steps are as follows:

[0061] First, acrylic UV resin, 1,6-hexanediol diacrylate, epoxy acrylic resin, trimethylolpropane triacrylate, nano-scale UV mirror silver paste, polyethylene wax, photosensitizer, heat stabilizer, defoamer and leveling agent were mixed and stirred evenly according to the mass percentage in Table 1 using a planetary mixer to obtain a mixed pigment. The mixed pigment was then placed for 3 hours to allow the mixed pigment to be fully wetted. The mixed pigment was then ground in a three-roll mill to obtain a fineness of less than 15 μm to obtain the desired UV metallic ink.

[0062] Use the ink knife to take a proper amount of UV metallic ink onto the 300 mesh screen printing screen, and evenly scrape the metallic ink onto the special black card paper at a 60° angle, and then pass it through a UV lamp with a curing energy of 300mj / cm 2 . The surface leveling of the UV metallic ink was observed, wherein the condition of no pinholes or shrinkage cavities was qualified, and the condition of no jagged edges and no scattered ink was qualified, and the results are shown in Table 2. At the same time, the gloss meter, fineness plate, viscosity meter and fluidity meter were used to measure the gloss, fineness, viscosity and fluidity of the UV metallic ink. Finally, the drying test was performed to determine its drying property. The measurement results are shown in Table 2.

[0063] After debossing, use 3M610 tape to compact the UV metallic ink printed surface, pull it up vertically 90 degrees quickly, and observe whether there is any ink falling off. The result shows that there is no ink falling off.

[0064] Finally, the predetermined pattern is printed on the surface of the black card paper using UV metallic ink by silk screen printing, such as Figure 2 shown.

[0065] Table 1 Raw materials used in the examples

[0066]

[0067]

[0068] Table 2 Performance parameters of UV metallic ink in Example

[0069]

[0070]

[0071] As can be seen from Table 2, the UV metallic ink provided by the present invention has excellent printing performance.

[0072] Comparative Example 1

[0073] The acrylic UV resin used in Comparative Example 1 is different from that in Example 1, and the rest is the same as that in Example 1. The specific parameters of the acrylic UV resin are shown in Table 3, and the properties of the prepared UV metallic ink are shown in Table 4. After debossing, the 3M610 tape was used for testing, and the ink fell off. Printing a predetermined pattern, such as Figure 3 shown.

[0074] Table 3 Acrylic UV resin used in Comparative Example 1

[0075] factory model Performance Indicators Sartomer USA SR9003 Molecular weight: 5000

[0076] Table 4 UV metallic ink performance parameters of comparative example 1

[0077]

[0078] Comparative Example 2

[0079] Comparative Example 2 uses ordinary silver paste to replace the nano-grade UV mirror silver paste in the embodiment, and the rest is the same as the embodiment. The specific parameters of the ordinary silver paste are shown in Table 5, and the properties of the prepared UV metallic ink are shown in Table 6. After the indentation, the 3M610 tape was used for testing, and the ink fell off. Printing a predetermined pattern, such as Figure 4 shown.

[0080] Table 5 Common silver paste used in Comparative Example 2

[0081] factory model Performance Indicators Xiucai Chemical XF007 Particle size: 14 μm

[0082] Table 6 UV metallic ink performance parameters of comparative example 2

[0083]

[0084] Comparative Example 3

[0085] Comparative Example 3 uses polyacrylate resin to replace the acrylic UV resin in the embodiment, and the rest is the same as the embodiment. The specific parameters of the polyacrylate resin are shown in Table 7, and the properties of the prepared UV metallic ink are shown in Table 8. After debossing, the 3M610 tape was used for testing, and the ink fell off. Printing a predetermined pattern, such as Figure 5 shown.

[0086] Table 7 Polyacrylate resin used in Comparative Example 3

[0087]

[0088]

[0089] Table 8 UV metallic ink performance parameters of comparative example 3

[0090]

[0091] It can be seen from the above that the UV metallic ink provided by the present invention has very good adhesion and printability. Figures 2 to 5 It can be seen that the pattern printed with UV metallic ink provided by the present invention has a stronger metallic feel. In addition, some common problems of special paper printing on the market are solved, such as surface ink dispersion, jagged edges, and various leveling problems such as shrinkage.

[0092] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A UV metallic ink for special paper, characterized in that: The following raw materials are included in mass percentage: 35-45wt% acrylic UV resin, 20-25wt% 1,6-hexanediol diacrylate, 5-15wt% epoxy acrylic resin, 5-15wt% trimethylolpropane triacrylate, 5-15wt% nano-scale UV mirror silver paste, 0.5-1.5wt% polyethylene wax, 5.5-6.5wt% photosensitizer, 0.5-1.5wt% heat stabilizer, 0.3-0.6wt% defoamer and 0.5-1.5wt% leveling agent; Wherein, the molecular weight of the acrylic UV resin is 30,000-80,000.

2. The UV metallic ink according to claim 1, characterized in that: The acrylic UV resin comprises one or more of pure acrylic UV resin, an inert pure acrylic UV resin mixture, and an inert methacrylic UV resin mixture; The epoxy acrylic resin includes one or more of bisphenol A epoxy acrylate with an average functionality greater than 2, rosin-modified epoxy acrylic resin, long-chain fatty acid-modified epoxy acrylic resin, anhydride-modified epoxy acrylate oligomer, and amine-modified epoxy acrylate oligomer.

3. The UV metallic ink according to claim 1, characterized in that: The photosensitizer includes one or more of benzophenone, 2-methyl-1-[4-methylthiophenyl]-2-morpholinyl-1-propanone, N-(ethoxycarbonylphenyl)-N'-methyl-N'-phenylformamidine, bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate, 2,4,6(trimethylbenzoyl)diphenylphosphine oxide, isopropylthioxanthenone (mixture of 2 and 4 isomers), 2,4-diethylthioxanthenone and 1-hydroxy-cyclohexyl-phenyl ketone. ; The leveling agent includes one or more of polyether siloxane copolymers, silicone acrylates, polyether modified polydimethylsiloxane, and fluorine-modified polyether siloxane copolymers; the defoaming agent includes one or more of polyether silicone copolymers, silicon, acrylate modified copolymers, etc.; the thermal stabilizer includes one or more of tri(N-nitroso-N-phenylhydroxylamine) aluminum salt, 2-phenol ethoxy acrylate, ethoxy mono-oil triacrylate, p-hydroxyanisole, and hydroquinone.

4. The UV metallic ink according to claim 1, characterized in that: The particle size of the nano-scale UV mirror silver paste is 0.1-3 μm, and the fineness of the UV metal ink is less than 15 μm.

5. The UV metallic ink according to claim 1, characterized in that: When the substrate is black cardboard, the glossiness of the UV metallic ink after printing is above 90° in a 60° angle test.

6. A method for preparing UV metallic ink as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: S1: Mix acrylic UV resin, 1,6-hexanediol diacrylate, epoxy acrylic resin, trimethylolpropane triacrylate, nano-grade UV mirror silver paste, polyethylene wax, photosensitizer, heat stabilizer, defoamer and leveling agent evenly and place for a predetermined time to completely eliminate the foam of the mixed pigment; S2: Grinding the mixed pigment after being placed for the predetermined time, so that the mixed pigment reaches a predetermined fineness.

7. The preparation method according to claim 6, characterized in that: The predetermined time is greater than 2 hours, and the predetermined fineness is less than 15 μm.

8. A printed product, characterized in that: The surface of the printed product has patterns and / or texts printed by the UV metallic ink described in any one of claims 1 to 5.

9. The printed product according to claim 8, characterized in that Printing is done by silk screen printing.

10. The printed product according to claim 8, characterized in that The printing substrate of the printed product is black card paper and / or kraft paper.

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