A UV ink and its preparation method

Abstract

The present invention belongs to the technical field of printing consumables, and discloses a UV ink and a preparation method thereof. The UV ink includes: polyester acrylate, reactive monomer, reactive diluent, photoinitiator; wherein the reactive monomer includes a first reactive monomer and a second reactive monomer, and the mass ratio of the two is 1:(1-3); the first reactive monomer includes acryloylmorpholine-based reactive monomers and alkyl acetal acrylate-based reactive monomers, and the second reactive monomer includes furan ring-based reactive monomers and aliphatic epoxy-based reactive monomers; the reactive diluent is butyl glycidyl ether and dipropylene glycol diacrylate, and the mass ratio of butyl glycidyl ether to dipropylene glycol diacrylate is 1:(2-5). The UV ink provided by the present invention can, while satisfying stability and printing fluidity, also have excellent color saturation and adhesion on the PE film, and can be widely applied to printers equipped with industrial-grade print heads.

Description

Technical Field

[0001] The present invention belongs to the technical field of printing consumables, and particularly relates to a UV ink and a preparation method thereof. Background Art

[0002] UV ink is a high-performance environmental protection product developed on the basis of photocurable coatings. Its second generation uses an acrylate curing system, which has the characteristics of fast curing speed and high crosslinking efficiency.

[0003] PE film is currently a widely used packaging material due to its good chemical stability. In the printing industry, it is often difficult to print on the film material of PE. Even after surface plasma treatment, traditional inks or general acrylate digital inks cannot achieve good adhesion effects. The main reason is that the formula components of traditional UV inks are relatively numerous, and there are various differences in the curing of various monomers. Monofunctional monomers are crucial for the adhesion to the substrate, but the curing speed is slow and the surface drying after curing is poor. Therefore, in the design of the formula, difunctional or higher polyfunctional monomers are usually considered to make up for the defects of slow curing, low crosslinking reaction, and poor surface drying of monofunctional monomers. However, this also causes a strong shrinkage problem during inkjet curing, resulting in excellent surface drying and rapid curing of the inkjet, but poor bottom drying, and the film layer curing does not fully contact the substrate well. Therefore, traditional free radical inks are difficult to have good surface adhesion effects on PE plastics, and due to the inherent characteristics of the free radical initiation mechanism of general acrylates, once the energy light source is lost during the crosslinking initiation process, the crosslinking reaction will slow down or even stop, and the monomers will not react sufficiently and residues will occur. As a result, unreacted monomers and small molecule compounds generated by the cleavage of initiators in the cured film layer emit a strong odor, and monofunctional monomers have a low molecular weight and high volatility, and the monomers are highly irritating to the human body, which is not conducive to the health of operators.

[0004] In addition, the patterns printed on PE films often have the problem of low color saturation. Color saturation, also known as color density, is the depth of a certain color in a printed matter and is one of the key indicators for evaluating the quality and consistency of printed matter.

[0005] Therefore, there is an urgent need to provide a UV ink that can have good adhesion to PE films and high color saturation of the printed patterns. Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems existing in the above-mentioned prior art. For this reason, the present invention provides a UV ink and a preparation method thereof. The UV ink provided by the present invention can show good adhesion effects on the surface-treated PE film after printing and curing, and the printed patterns have high color saturation.

[0007] The present invention provides a UV ink, which comprises the following components by weight:

[0008] 10-40 parts of polyester acrylate

[0009] 30-70 parts of reactive monomer

[0010] 3-20 parts of reactive diluent

[0011] 3-15 parts of photoinitiator

[0012] The reactive monomer includes a first reactive monomer and a second reactive monomer, and the mass ratio of the first reactive monomer to the second reactive monomer is 1:(1-3);

[0013] The first reactive monomer includes acryloylmorpholine-based reactive monomers and alkyl acetal acrylate-based reactive monomers. The acryloylmorpholine-based reactive monomers are selected from N-acryloylmorpholine or / and N-methylacryloylmorpholine, and the alkyl acetal acrylate-based reactive monomers are selected from at least one of ethyl acetal acrylate, ethyl acetal methacrylate, and trimethylolpropane methyl acetal acrylate;

[0014] The second reactive monomer includes furan ring-based reactive monomers and aliphatic epoxy-based reactive monomers;

[0015] The reactive diluent is butyl glycidyl ether and dipropylene glycol diacrylate; the mass ratio of butyl glycidyl ether to dipropylene glycol diacrylate is 1:(2-5).

[0016] Preferably, the mass ratio of the first reactive monomer to the second reactive monomer is 1:(1.5-2.5).

[0017] Preferably, the mass ratio of the acryloylmorpholine-based reactive monomers to the alkyl acetal acrylate-based reactive monomers is 1:(0.2-5); more preferably, the mass ratio of the acryloylmorpholine-based reactive monomers to the alkyl acetal acrylate-based reactive monomers is (0.3-3).

[0018] Preferably, the furan ring-based reactive monomer is 2-furanacrylic acid; the aliphatic epoxy-based reactive monomers are selected from at least one of bisphenol A diglycidyl ether, hydrogenated bisphenol A diglycidyl ether, and 1,4-butanediol diglycidyl ether.

[0019] Preferably, the mass ratio of the furan ring-based reactive monomers to the aliphatic epoxy-based reactive monomers is 1:(1-3); more preferably, the mass ratio of the furan ring-based reactive monomers to the aliphatic epoxy-based reactive monomers is 1:(1-2).

[0020] Preferably, the polyester acrylate is selected from at least one of aliphatic polyurethane acrylate, aromatic polyurethane acrylate, and silicone-modified polyurethane acrylate.

[0021] Preferably, the photoinitiator is selected from at least one of diazonium salt photoinitiators, arylsulfonium photoinitiators, iodonium salt photoinitiators, sulfonyloxy ketone photoinitiators, triarylsiloxane ether photoinitiators, and coumarin oxime ester photoinitiators.

[0022] Preferably, by weight, the UV ink comprises the following components:

[0023] Polyester acrylate 15 - 35 parts

[0024] Reactive monomer 35 - 65 parts

[0025] Reactive diluent 5 - 15 parts

[0026] Photoinitiator 5 - 10 parts.

[0027] More preferably, by weight, the UV ink comprises the following components:

[0028] Polyester acrylate 20 - 30 parts

[0029] Reactive monomer 40 - 60 parts

[0030] Reactive diluent 8 - 15 parts

[0031] Photoinitiator 6 - 10 parts.

[0032] Preferably, by weight, the UV ink further comprises 2 - 15 parts of nano-scale pigment and 0.5 - 15 parts of additives.

[0033] Preferably, the nano-scale pigment includes at least one of pigment blue, pigment red, pigment yellow, carbon black, and titanium dioxide.

[0034] Preferably, the additives include at least one of dispersants, leveling agents, and wetting agents; the dispersants include at least one of Dispers710 and Dispers681; the leveling agents include at least one of Rad 2200 and Rad2250; the wetting agents include at least one of Rad 2600 and Rad2700.

[0035] The present invention also provides a method for preparing a UV ink, comprising the following steps:

[0036] Mix the nano-scale pigment, the first reactive monomer, and the additives, disperse and grind them, then add the polyester acrylate, the second reactive monomer, the reactive diluent, and the photoinitiator. After mixing evenly, filter to obtain the UV ink.

[0037] Preferably, in the filtering step, first filter with a 1.0 μm fiberglass filter membrane, and then filter with a 0.45 μm PP filter membrane.

[0038] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0039] (1) The UV ink provided by the present invention mainly consists of polyester acrylate, reactive monomer, reactive diluent, and photoinitiator. Among them, the reactive monomer includes a first reactive monomer composed of morpholine acrylate and alkyl acetal acrylate with relatively low volatile odor, and a second reactive monomer composed of furan ring and aliphatic epoxy with better adhesion. By controlling the ratio of the first reactive monomer and the second reactive monomer, the crosslinking and curing effect of the ink on the PE film can be optimized, forming a printing layer with a dense texture, strong adhesion, and high color saturation. In addition, the present invention uses butyl glycidyl ether and dipropylene glycol diacrylate as reactive diluents, and by controlling the ratio of the two, not only can the viscosity of the system be effectively reduced, the fluidity of the system and the compatibility of each component be improved, thereby improving the stability and printing smoothness of the ink; but also it is beneficial to the penetration and adhesion of the ink, improving the curing speed and adhesion performance of the ink.

[0040] (2) The UV ink provided by the present invention can satisfy the stability and printing smoothness, and also has excellent color saturation and adhesion on the PE film, and can be widely applied to printers equipped with industrial-grade print heads. Detailed Embodiments

[0041] In order to make those skilled in the art more clearly understand the technical solutions of the present invention, the following examples are listed for illustration. It should be noted that the following examples do not limit the protection scope required by the present invention.

[0042] Unless otherwise specified, the raw materials, reagents or devices used in the following examples and comparative examples can be obtained from conventional commercial channels, or can be obtained by existing known methods.

[0043] Example 1

[0044] A UV ink, by weight, includes the following components:

[0045] Aliphatic polyurethane acrylate (Zhanxin UCECOAT 7177) 25 parts

[0046] First reactive monomer 18 parts

[0047] Second reactive monomer 36 parts

[0048] Reactive diluent 12 parts

[0049] Diphenyliodonium hexafluorophosphate 8 parts

[0050] 8 parts of nano - grade pigment blue

[0051] 2 parts of dispersant Dispers710

[0052] 1 part of leveling agent Rad 2200

[0053] 1 part of wetting agent Rad 2600;

[0054] The first active monomer is 8 parts of N - acryloylmorpholine and 10 parts of acetal acrylate; the second active monomer is 12 parts of 2 - furanacrylic acid and 24 parts of bisphenol A diglycidyl ether; the active diluent is 3 parts of butyl glycidyl ether and 9 parts of dipropylene glycol diacrylate.

[0055] A preparation method of UV ink, comprising the following steps:

[0056] Mix nano - grade pigment blue, the first active monomer and dispersant Dispers710, and disperse and grind; then add the second active monomer, active diluent, aliphatic polyurethane acrylate, photo - initiator diphenyliodonium hexafluorophosphate, leveling agent Rad 2200, wetting agent Rad 2600, and mix well; then filter with a 1.0μm glass fiber filter membrane and finally filter with a 0.45μm PP filter membrane, and the obtained filtrate is the UV ink.

[0057] Example 2

[0058] A UV ink, by weight, comprises the following components:

[0059] 28 parts of aliphatic polyurethane acrylate

[0060] 18 parts of the first active monomer

[0061] 42 parts of the second active monomer

[0062] 16 parts of active diluent

[0063] 9 parts of diphenyliodonium hexafluorophosphate

[0064] 9 parts of nano - grade pigment blue

[0065] 2 parts of dispersant Dispers710

[0066] 1 part of leveling agent Rad 2200

[0067] 1 part of wetting agent Rad 2600;

[0068] The first active monomer is 8 parts of N-methacryloylmorpholine and 10 parts of acetal methacrylate; the second active monomer is 14 parts of 2-furan acrylic acid and 28 parts of 1,4-butanediol diglycidyl ether; and the active diluent is 4 parts of butyl glycidyl ether and 12 parts of dipropylene glycol diacrylate.

[0069] A method for preparing UV ink comprises the following steps:

[0070] The nano-scale pigment blue, the first active monomer, and the dispersant Dispers710 are mixed and dispersed and ground; then the second active monomer, the active diluent, the aliphatic polyurethane acrylate, the photoinitiator diphenyliodonium hexafluorophosphate, the leveling agent Rad 2200, and the wetting agent Rad 2600 are added and mixed thoroughly; then filtered through a 1.0 μm glass fiber filter membrane, and finally filtered through a 0.45 μm PP filter membrane, and the obtained filtrate is the UV ink.

[0071] Example 3

[0072] A UV ink, comprising the following components by weight:

[0073] Aliphatic polyurethane acrylate 35 parts

[0074] 12 parts of the first active monomer

[0075] 24 parts of the second active monomer

[0076] Active diluent 7 parts

[0077] 8 parts of diphenyliodonium hexafluorophosphate

[0078] 8 parts of nano pigment blue

[0079] Dispersant Dispers710 2 parts

[0080] Leveling agent Rad 2200 1 part

[0081] Wetting agent Rad 2600 1 part;

[0082] The first active monomer is 5 parts of N-acryloylmorpholine and 7 parts of acetal acrylate; the second active monomer is 8 parts of 2-furan acrylic acid and 16 parts of bisphenol A diglycidyl ether; and the active diluent is 2 parts of butyl glycidyl ether and 5 parts of dipropylene glycol diacrylate.

[0083] A method for preparing UV ink comprises the following steps:

[0084] The nano-scale pigment blue, the first active monomer, and the dispersant Dispers710 are mixed and dispersed and ground; then the second active monomer, the active diluent, the aliphatic polyurethane acrylate, the photoinitiator diphenyliodonium hexafluorophosphate, the leveling agent Rad 2200, and the wetting agent Rad 2600 are added and mixed thoroughly; then filtered through a 1.0 μm glass fiber filter membrane, and finally filtered through a 0.45 μm PP filter membrane, and the obtained filtrate is the UV ink.

[0085] Example 4

[0086] A UV ink, comprising the following components by weight:

[0087] Aliphatic polyurethane acrylate 25 parts

[0088] 27 parts of the first active monomer

[0089] 27 parts of the second active monomer

[0090] Active diluent 12 parts

[0091] 8 parts of diphenyliodonium hexafluorophosphate

[0092] 8 parts of nano pigment blue

[0093] Dispersant Dispers710 2 parts

[0094] Leveling agent Rad 2200 1 part

[0095] Wetting agent Rad 2600 1 part;

[0096] The first active monomer is 12 parts of N-acryloylmorpholine and 15 parts of acetal acrylate; the second active monomer is 14 parts of 2-furan acrylic acid and 13 parts of bisphenol A diglycidyl ether; the active diluent is 4 parts of butyl glycidyl ether and 8 parts of dipropylene glycol diacrylate.

[0097] A method for preparing UV ink comprises the following steps:

[0098] The nano-scale pigment blue, the first active monomer, and the dispersant Dispers710 are mixed and dispersed and ground; then the second active monomer, the active diluent, the aliphatic polyurethane acrylate, the photoinitiator diphenyliodonium hexafluorophosphate, the leveling agent Rad 2200, and the wetting agent Rad 2600 are added and mixed thoroughly; then filtered through a 1.0 μm glass fiber filter membrane, and finally filtered through a 0.45 μm PP filter membrane, and the obtained filtrate is the UV ink.

[0099] Comparative Example 1

[0100] A UV ink, comprising the following components by weight:

[0101] Aliphatic polyurethane acrylate 25 parts

[0102] 18 parts of the first active monomer

[0103] 36 parts of the second active monomer

[0104] Active diluent 12 parts

[0105] 8 parts of diphenyliodonium hexafluorophosphate

[0106] 8 parts of nano pigment blue

[0107] Dispersant Dispers710 2 parts

[0108] Leveling agent Rad 2200 1 part

[0109] Wetting agent Rad 2600 1 part;

[0110] The first active monomer is acetal acrylate; the second active monomer is bisphenol A diglycidyl ether; and the active diluent is 3 parts of butyl glycidyl ether and 9 parts of dipropylene glycol diacrylate.

[0111] A method for preparing UV ink comprises the following steps:

[0112] The nano-scale pigment blue, the first active monomer, and the dispersant Dispers710 are mixed and dispersed and ground; then the second active monomer, the active diluent, the aliphatic polyurethane acrylate, the photoinitiator diphenyliodonium hexafluorophosphate, the leveling agent Rad 2200, and the wetting agent Rad 2600 are added and mixed thoroughly; then filtered through a 1.0 μm glass fiber filter membrane, and finally filtered through a 0.45 μm PP filter membrane, and the obtained filtrate is the UV ink.

[0113] Comparative Example 2

[0114] A UV ink, comprising the following components by weight:

[0115] Aliphatic polyurethane acrylate 25 parts

[0116] 36 parts of the first active monomer

[0117] 18 parts of the second active monomer

[0118] Active diluent 12 parts

[0119] 8 parts of diphenyliodonium hexafluorophosphate

[0120] 8 parts of nano pigment blue

[0121] Dispersant Dispers710 2 parts

[0122] 1 part of leveling agent Rad 2200

[0123] 1 part of wetting agent Rad 2600;

[0124] The first active monomer is 16 parts of N - acryloylmorpholine and 20 parts of acetal acrylate; the second active monomer is 6 parts of 2 - furan acrylic acid and 12 parts of bisphenol A diglycidyl ether; the active diluent is 3 parts of butyl glycidyl ether and 9 parts of dipropylene glycol diacrylate.

[0125] A preparation method of UV ink, comprising the following steps:

[0126] Mix nano - level pigment blue, the first active monomer, and dispersant Dispers710, and disperse and grind; then add the second active monomer, active diluent, aliphatic polyurethane acrylate, photoinitiator diphenyliodonium hexafluorophosphate, leveling agent Rad 2200, and wetting agent Rad 2600, and mix well; then filter with a 1.0μm glass fiber filter membrane and finally filter with a 0.45μm PP filter membrane, and the obtained filtrate is the UV ink.

[0127] Comparative Example 3

[0128] A UV ink, by weight, comprises the following components:

[0129] 25 parts of aliphatic polyurethane acrylate

[0130] 18 parts of the first active monomer

[0131] 36 parts of the second active monomer

[0132] 12 parts of active diluent

[0133] 8 parts of diphenyliodonium hexafluorophosphate

[0134] 8 parts of nano - level pigment blue

[0135] 2 parts of dispersant Dispers710

[0136] 1 part of leveling agent Rad 2200

[0137] 1 part of wetting agent Rad 2600;

[0138] The first active monomer is 8 parts of N - acryloylmorpholine and 10 parts of acetal acrylate; the second active monomer is 12 parts of 2 - furan acrylic acid and 24 parts of bisphenol A diglycidyl ether; the active diluent is 12 parts of dipropylene glycol diacrylate.

[0139] A preparation method of UV ink, comprising the following steps:

[0140] The nano-scale pigment blue, the first active monomer, and the dispersant Dispers710 are mixed and dispersed and ground; then the second active monomer, the active diluent, the aliphatic polyurethane acrylate, the photoinitiator diphenyliodonium hexafluorophosphate, the leveling agent Rad 2200, and the wetting agent Rad 2600 are added and mixed thoroughly; then filtered through a 1.0 μm glass fiber filter membrane, and finally filtered through a 0.45 μm PP filter membrane, and the obtained filtrate is the UV ink.

[0141] Comparative Example 4

[0142] A UV ink, comprising the following components by weight:

[0143] Aliphatic polyurethane acrylate 25 parts

[0144] 18 parts of the first active monomer

[0145] 36 parts of the second active monomer

[0146] Active diluent 12 parts

[0147] 8 parts of diphenyliodonium hexafluorophosphate

[0148] 8 parts of nano pigment blue

[0149] Dispersant Dispers710 2 parts

[0150] Leveling agent Rad 2200 1 part

[0151] Wetting agent Rad 2600 1 part;

[0152] The first active monomer is 8 parts of N-acryloylmorpholine and 10 parts of acetal acrylate; the second active monomer is 18 parts of 1,4-butanediol diglycidyl ether and 18 parts of bisphenol A diglycidyl ether; and the active diluent is 3 parts of butyl glycidyl ether and 9 parts of dipropylene glycol diacrylate.

[0153] A method for preparing UV ink comprises the following steps:

[0154] The nano-scale pigment blue, the first active monomer, and the dispersant Dispers710 are mixed and dispersed and ground; then the second active monomer, the active diluent, the aliphatic polyurethane acrylate, the photoinitiator diphenyliodonium hexafluorophosphate, the leveling agent Rad 2200, and the wetting agent Rad 2600 are added and mixed thoroughly; then filtered through a 1.0 μm glass fiber filter membrane, and finally filtered through a 0.45 μm PP filter membrane, and the obtained filtrate is the UV ink.

[0155] Product effect testing

[0156] 1. Stability test

[0157] The UV inks prepared in Examples 1-4 and Comparative Examples 1-4 were subjected to a stability test. The specific test process was as follows: The UV ink was first placed at -10°C and left standing for 1 day, then placed at 60°C and left standing for 1 day, and then placed at -10°C and left standing for 1 day. This cycle was repeated 7 times, and it was observed whether the UV ink was stratified. Then, the UV ink was printed using a high-speed printer with a Kyocera printhead (printing speed: 150 m / min), and it was observed whether the printhead was clogged and whether there was ink breakage during printing to judge its printing smoothness. The test results are shown in Table 1.

[0158] 2. Adhesion test

[0159] The UV inks prepared in Examples 1-4 and Comparative Examples 1-4 were respectively printed on a PE film. After complete curing, a white textile cloth soaked in ultrapure water was used to wipe the coating 200 times under a pressure of 1 kg on a friction resistance tester. One round trip counted as 2 times, and it was observed whether there was blurring, peeling, or exposure of the substrate on the surface of the printed layer after wiping. The test results are shown in Table 1.

[0160] 3. Color density (color saturation) test

[0161] 1.8 L of the UV inks prepared in Examples 1-4 and Comparative Examples 1-4 were each taken and printed using a high-speed printer with a ceramic printhead (printing speed: 150 m / min). On a PE film, single-color blocks with 80% ink volume were printed. After complete curing, a color difference meter from X-RITE in the United States was used for testing, and the color density values were recorded. The ambient temperature was controlled at 25°C and the ambient humidity was controlled at about 45% during both the printing and standby stages. The test results are shown in Table 2.

[0162] Table 1

[0163]

[0164] As can be seen from Table 1, the UV inks prepared in the examples of the present invention have good stability. After high and low temperature cycling treatment, the ink does not stratify, and the printing smoothness is excellent, which is significantly better than that of the comparative examples. Moreover, in the adhesion test, the printed layer of the examples of the present invention is closely combined with the PE film, has strong adhesion, and is resistant to wiping, which is also significantly better than that of the comparative examples.

[0165] Table 2

[0166]

[0167] The examples and comparative examples of the present invention are of the same color. Among them, the content of nano pigment blue in each ink in Example 1, Example 4, and the comparative examples is the same, and the rest are slightly different. After printing each group of inks on a PE film, the examples of the present invention show a higher color density and high color saturation, which are better than those of the comparative examples.

[0168] The above-described embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent for the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention shall be subject to the appended claims.

Claims

1. A UV ink, characterized in that, By weight, it includes the following components: Polyester acrylate 15 - 35 parts Reactive monomer 35 - 65 parts Reactive diluent 5 - 15 parts Photoinitiator 5 - 10 parts The reactive monomer includes a first reactive monomer and a second reactive monomer, and the mass ratio of the first reactive monomer to the second reactive monomer is 1:(1.5 - 2.5); The first reactive monomer includes acryloylmorpholine - type reactive monomers and alkyl acetal acrylate - type reactive monomers. The acryloylmorpholine - type reactive monomers are selected from N - acryloylmorpholine or / and N - methylacryloylmorpholine, and the alkyl acetal acrylate - type reactive monomers are selected from at least one of ethyl acetal acrylate, ethyl acetal methacrylate, and trimethylolpropane methyl acetal acrylate; The mass ratio of the acryloylmorpholine - type reactive monomer to the alkyl acetal acrylate - type reactive monomer is 1:(0.2 - 5); The second reactive monomer includes furan - ring - type reactive monomers and aliphatic epoxy - type reactive monomers; The mass ratio of the furan - ring - type reactive monomer to the aliphatic epoxy - type reactive monomer is 1:(1 - 3); The furan - ring - type reactive monomer is 2 - furanacrylic acid; the aliphatic epoxy - type reactive monomers are selected from at least one of bisphenol A diglycidyl ether, hydrogenated bisphenol A diglycidyl ether, and 1,4 - butanediol diglycidyl ether; The reactive diluent is butyl glycidyl ether and dipropylene glycol diacrylate; the mass ratio of butyl glycidyl ether to dipropylene glycol diacrylate is 1:(2 - 5).

2. The UV ink according to claim 1, wherein The polyester acrylate is selected from at least one of aliphatic polyurethane acrylate, aromatic polyurethane acrylate, and silicone - modified polyurethane acrylate.

3. The UV ink according to claim 1, characterized in that, The photoinitiator is selected from at least one of diazonium salt photoinitiators, arylsulfonium photoinitiators, iodonium salt photoinitiators, sulfonyloxy ketone photoinitiators, triarylsiloxane photoinitiators, and coumarin oxime ester photoinitiators.

4. The UV ink according to claim 1, wherein By weight, the UV ink further includes 2 - 15 parts of nano - scale pigments and 0.5 - 15 parts of additives.

5. The UV ink according to claim 4, characterized in that, The nano - scale pigments include at least one of pigment blue, pigment red, pigment yellow, carbon black, and titanium dioxide.

6. The preparation method of the UV ink according to claim 4 or 5, characterized in that, It includes the following steps: Mix the nano - scale pigments, the first reactive monomer, and the additives, disperse and grind them, then add the polyester acrylate, the second reactive monomer, the reactive diluent, and the photoinitiator. After mixing evenly, filter to obtain the UV ink.

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