Preparation method of electron beam radiation curing intaglio printing ink

Abstract

The brand new EB printing ink and the preparation method thereof have the advantages of being green and environmentally friendly, the chemical bond conversion efficiency of active components in the printing ink is improved under the condition that the irradiation dosage is not increased, and the production energy consumption is reduced while the curing effect and the printing quality are improved through multiple times of irradiation curing at the temperature of 30-60 DEG C; no organic solvent or photoinitiator is contained, and the risks of VOCs emission and small molecule migration are avoided; the low-surface-energy plastic gravure ink is free of any filler, good in fluidity and good in leveling and adhesion effect on a low-surface-energy plastic surface, and the technical indexes such as ink viscosity, surface tension, particle size and color density meet the technological requirements of gravure printing on a plastic base material.

Description

Technical Field

[0001] The present application relates to the field of printing, and in particular to the field of electron beam radiation curing ink. Background Art

[0002] Gravure printing is the main method of plastic packaging printing at present, and is widely used in food and drug packaging printing. Its main feature is that the blank part of the printing plate is higher than the image part, and all the blank parts are on the same plane. When using the gravure printing plate for printing, after the printing plate is fully coated with ink, the ink scraping device is used to scrape off the ink on the blank part of the printing plate, and then it is pressed by the impression roller (such as the attached Figure 1 shown).

[0003] Due to the fast speed and thick ink film of gravure printing, in order to achieve the purpose of fast drying, most of the current gravure printing uses high-volatility quick-drying inks, which rely on the volatilization of organic solvents to dry and form films. The volatile component content in the ink can be as high as 60%. During the production and use process, a large amount of volatile organic compounds (VOCs) will be emitted, which is not conducive to environmental protection and the health of practitioners. In recent years, some UV-curable gravure inks have been developed, which rely on photosensitive substances such as photoinitiators to trigger liquid active components to undergo photocuring reactions and dry films. This type of ink solves the problem of VOCs emissions, but because the cleavage of photoinitiators will release small molecules, and there may be incomplete photolysis, the residual photoinitiator and its cleavage products will migrate, which will cause harm to the environment and human health, especially to food and drug packaging. Therefore, the development of green and environmentally friendly gravure inks without VOCs emissions, photoinitiators, and food and drug contact materials printing is of great significance.

[0004] Electron beam (EB) curing is a form of radiation curing. EB curing ink refers to an ink that can undergo cross-linking polymerization and thus cure quickly under the action of electrons with a certain amount of energy (motion). The main components are pigments, monomers, oligomers and additives. Under the radiation of electron beams, the liquid oligomers and monomers in EB curing inks undergo cross-linking polymerization to quickly form a solid ink layer. At present, EB curing inks based on free radical mechanisms are the most widely used. Under the action of EB radiation, the monomers and oligomers in the ink produce free radicals, which initiate or attack the unsaturated system to undergo polymerization and cross-linking, or the free radicals themselves undergo cross-linking, thereby drying the liquid ink into a film. Compared with inks that rely on solvent evaporation to dry and form a film, EB curing inks are safe and environmentally friendly, have no harmful volatiles, do not pollute the environment and packaging contents, and are more suitable for use in the field of food and pharmaceutical packaging printing. The composition of EB-curing ink is very similar to that of UV-curing ink, but UV-curing ink must add photoinitiator, while EB-curing ink based on free radical mechanism does not require photoinitiator, avoiding the impact of small molecule migration of photoinitiator on the ecological environment and human health, and does not produce harmful photodecomposition products. The odor of printed products is smaller than that of UV-curing ink, and the material cost is lower; the heat generated during curing is smaller than that of UV-curing ink.

[0005] The electron beam is generated by an electron accelerator. The two important process parameters of electron beam radiation curing are the energy of the electron beam (unit eV) and the irradiation dose (unit J / kg, also known as Gy). The energy of the electron beam and the density of the material determine the penetration depth of the electron beam in the material. The irradiation dose required for EB-cured ink to complete curing is related to the ink formula. Compared with lithographic inks, flexographic inks and inkjet inks, the ink layer of gravure inks is larger. Therefore, the curing process of EB-cured gravure inks is a technical indicator that needs to be focused on, and the energy and irradiation dose of the electron beam need to be reasonably selected. If the energy of the electron beam is too low, it cannot penetrate the ink layer. If the energy is too high, it will damage the ink layer and the printing material, and it will also increase the power and energy consumption of the electron accelerator; the irradiation dose required for curing can reflect the difficulty of curing. The higher the irradiation dose, the greater the power and energy consumption demand of the electron accelerator. Therefore, reducing the energy and irradiation dose of the electron beam is conducive to energy conservation and emission reduction, and reducing production costs.

[0006] The prior art discloses some techniques for preparing inks using electron beam curing methods:

[0007] "Electron beam cured metal surface printing ink and preparation method thereof" (CN201710429421) discloses an electron beam cured metal surface printing ink, which includes the following components by weight: 10-20 parts of polypropylene, 1-10 parts of polyurethane acrylate, 10-20 parts of polyether amine, 20-60 parts of n-butyl methacrylate, 10-20 parts of titanium dioxide, 0.1-2 parts of dispersant, and 1-30 parts of anti-corrosion pigment. Under the synergistic effect of the components such as polypropylene, polyurethane acrylate, polyether amine, and n-butyl methacrylate, the ink can form a strong and interactive high molecular three-dimensional polymerization network in a very short curing time, so that the ink film has high hardness, adhesion, chemical resistance, friction resistance, heat resistance, and boiling resistance.

[0008] However, the patent does not provide any test data for gravure printing or printing on plastic surfaces. Plastics and metals have different surface properties, and the surface energy of plastics is lower than that of metals, so the requirements for ink leveling, adhesion and surface tension are different.

[0009] "An EB-cured tinplate ink" (CN202210475452) discloses an EB-cured tinplate ink, which relates to the field of coating technology and includes the following components by weight: 20-40 parts of modified acrylate; 40-60 parts of alicyclic side chain acrylic resin; 0.1 part of inhibitor; 10-20 parts of active monomer; 20-30 parts of pigment; 20-30 parts of filler; 0.3 part of leveling agent; 0.3 part of dispersant; 0.3 part of defoamer. The EB-cured tinplate ink provided by it can be cured without adding a photoinitiator, thus avoiding the presence of a large number of small molecule fragments in the prepared tinplate ink, so that the tinplate ink can meet the requirements of food packaging; in addition, by introducing alicyclic side chain acrylic resin, the steric hindrance can be increased, making the relative displacement between molecular chains easier, thereby effectively improving the impact resistance of the tinplate ink and improving its mechanical properties.

[0010] Inhibitors are used, preferably at least one of quinone inhibitors and phenolic inhibitors, which have an inhibitory effect on the polymerization and cross-linking of monomers and oligomers. Therefore, the ink formula of the patent requires the use of a higher energy electron beam (150-200keV). The 1500 mesh talc powder, 3000 mesh talc powder, and 5000 mesh talc powder contained therein will affect the fluidity of the ink, including viscosity and particle size, and are not suitable for gravure printing process.

[0011] "Green and environmentally friendly high-speed printing EB curing ink" (CN201710122546.8) discloses a green and environmentally friendly high-speed printing EB curing ink, which is prepared from the following components by mass: 45-50 parts of epoxy acrylate, 15-20 parts of diluent, 5-10 parts of lubricant, 5-15 parts of curing agent, 2-5 parts of surfactant, 2-10 parts of pigment, 1-3 parts of antistatic agent, 0.5-2 parts of defoamer, 1-2 parts of wetting dispersant, 0.5-2 parts of antioxidant and 1-3 parts of leveling agent. Its curing agent is a mixture of N-vinyl pyrrolidone and dimethylaminoethanol in a mass ratio of 4:1. Dimethylaminoethanol is a volatile substance with an ammonia smell. During use, volatile gases and small molecule migration will still be generated, causing environmental pollution.

[0012] "An EB ink with optical color-changing properties and its preparation method" (CN201911418465) discloses an EB ink, characterized in that it is composed of the following mass fractions of components: the prepolymer is one or more of modified acrylic epoxy ester, trimethylolpropane trimethacrylate and tripropylene glycol diacrylate, the pigment is an optically variable pigment; the auxiliary agent includes at least one of a wetting agent and a surface modifier. The steps in the preparation process include "adding the prepolymer and a corresponding proportion of an alcohol-water mixed solvent into a reaction vessel and mixing and stirring", which uses volatile alcohol substances, releases VOCs, is not environmentally friendly, and is not suitable for gravure printing.

[0013] In addition, the EB curing process in the above-mentioned prior art is conventional one-time curing, that is, only one irradiation is performed.

[0014] The present application provides a new EB ink and a preparation method thereof, which have the advantages of being green and environmentally friendly: the chemical bond conversion efficiency of the active components in the ink is improved without increasing the radiation dose, and the curing effect and printing quality are improved while reducing production energy consumption through multiple radiation curing; it does not contain any organic solvents and photoinitiators, and there is no risk of VOCs emissions and small molecule migration; it does not use any fillers, has good fluidity, and has good leveling and adhesion effects on low surface energy plastic surfaces; the technical indicators of the ink such as viscosity, surface tension, particle size and color density meet the process requirements of gravure printing on plastic substrates. Summary of the invention

[0015] The present invention provides an EB gravure ink and its printing and curing process, materials, and equipment, and its specific technical scheme is as follows:

[0016] An electron beam radiation curing gravure printing ink is prepared from the following components:

[0017] (1) prepolymer, wherein the prepolymer is one or more of EB811, EB870, EB150, CN9013NS, EM6215-100, and EM6325-100;

[0018] (2) Monomers, one or more of acryloyl morpholine (ACMO), ethoxyethyl acrylate (EOEOEA), 1,6-hexanediol diacrylate (HDDA), dipropylene glycol diacrylate (DPGDA), neopentyl glycol acrylate (NPGDA), tripropylene glycol diacrylate (TPGDA), and trimethylolpropane triacrylate (TMPTA);

[0019] (3) Pigment paste, wherein the pigment comprises one of phthalocyanine blue 8560, yellow #12, purple red LH-7758, and non-grinding black LH-SF03B.

[0020] (4) Leveling agent: TEGO 432, BYK 394, ETERAD 4613.

[0021] Pigment dispersant: 670;

[0022] Preferably, the prepolymer is one or two of EM6215-100 and EB150;

[0023] Preferably, the monomer is one or both of acryloyl morpholine (ACMO) and ethoxyethyl acrylate (EOEOEA), and the ratio of ACMO to EOEOEA is preferably 4:6-6:4.

[0024] Preferably, the prepolymer is 4-30 parts, the monomer is 8-70 parts, and the leveling agent is 0.1-0.5 parts.

[0025] Preferably, the ratio of oligomer to monomer is 1:2-1:7.

[0026] The preparation process of the ink comprises the following steps:

[0027] (i) Preparation of color paste: pigment, monomer and dispersant are mixed in proportion, stirred and dispersed for 30-60 minutes, and finally zirconium oxide beads are added and ground for 30-75 minutes to prepare color paste. The prepared color paste is mixed with oligomer, monomer and auxiliary agent in proportion, stirred for 15-60 minutes and then allowed to stand at room temperature for 6-12 hours to obtain EB gravure ink.

[0028] (II) Printing samples and curing

[0029] The prepared ink was printed on a PET film substrate using a gravure proofing machine, and the printed pattern was a rectangular color block with different dot densities, and the dot density was 60-100%. The substrate and the ink layer were heated as a whole for about 1 minute. The curing was completed using an electron accelerator.

[0030] EB irradiation can be applied once or multiple times. Preferably, the irradiation is evenly divided into 2-6 times according to the dose, and curing is stopped when the accumulated absorbed dose reaches a certain value.

[0031] Preferably, the ratio of oligomer to monomer is about 1:2-1:7.

[0032] Preferably, the electron beam energy is 100-160 keV, and the irradiation dose is 10-150 kGy.

[0033] Preferably, the printed sample is heated to a temperature of 30-60° C. before curing.

[0034] (III) Performance test

[0035] (1) Determination of radiation dose required for gravure ink curing

[0036] After printing, the sample sheets are irradiated with EB, and the surface of the ink film is checked by touching it with fingers to see if it is dry. The minimum irradiation dose (in kGy) required to make the ink film surface dry is measured.

[0037] (2) Double bond conversion rate of EB gravure ink

[0038] The uncured and cured inks were used as samples, mixed with potassium bromide, ground, and pressed into tablets, and the FT-IR spectra were measured on an infrared spectrometer (Thermofisher Nicolet iS50). The 810 cm -1 Nearby carbon-carbon double bond (C=C) and 1720cm -1 The peak area of ​​the carbonyl group (C=O) near the carbonyl group is calculated using the following formula

[0039] The conversion rate of double bonds reflects the curing degree of ink:

[0040]

[0041] Where S and S' are 810cm -1 The peak area of ​​the nearby carbon-carbon double bond (C=C) before and after curing, S ref and S'

[0042] ref 1720cm respectively -1 The peak area of ​​nearby carbonyl (C=O) before and after curing, the absorption peak of carbonyl is used as the internal standard.

[0043] (3) Evaluation of the dispersibility of EB gravure inks and color pastes

[0044] The D90 particle size of the ink and color paste was measured using a laser particle size analyzer (Microtrac S3500) to evaluate the dispersibility.

[0045] (4) Evaluation of surface tension of EB gravure ink

[0046] The surface tension of the ink was tested using a fully automatic surface tension meter (Krüss K100) with the platinum plate pull-off method.

[0047] (5) Evaluation of EB gravure ink viscosity

[0048] The shear rate was 1s at 25°C using a rheometer (TA AR2000ex) and a 60 mm aluminum parallel plate. -1 The viscosity value at .

[0049] (6) Evaluation of EB gravure ink adhesion

[0050] The adhesion of the ink on the PET substrate was tested according to the method of GB / T 9286-1998. The cured sample was scratched into a 10×10 grid array with a paint film scratcher, and the grid array was lightly brushed with a soft brush. Then, an adhesion test tape (3M610#) was applied to the grid array and then torn off. The peeling of the ink was observed and the adhesion grade of the ink was evaluated. As shown in Table 3, the smaller the adhesion grade, the better the sample adhesion.

[0051] Table 2 Description of adhesion evaluation levels

[0052]

[0053] (7) Ink leveling

[0054] Ten printed samples were prepared by printing on a PET substrate using a proofing machine and irradiated with an electron beam. The flatness of the ink film on the printed samples was observed and the leveling performance was evaluated. As shown in Table 4, the smaller the grade, the better the leveling performance of the sample. The 10 printed samples were scored separately and the average value was calculated and rounded to evaluate the leveling performance of the ink.

[0055] Table 3 Leveling grade description

[0056]

[0057] (8) Color density

[0058] Use SpectroEye spectrophotometer to measure the color density of the color block with 100% dot density on the sample, and measure three times to get the average value. Figure 2 shown.

[0059] Table 4 Color density standard values ​​refer to CY / T 6-1991 Gravure printing quality requirements and test methods

[0060] Color Effective density of fine print Effective density of general printed matter Yellow (Y) 0.90-1.10 0.85-1.05 Magenta (M) 1.20-1.50 1.15-1.45 Blue (C) 1.40-1.70 1.30-1.60 Black (BK) 1.60-1.90 1.50-1.80 BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 The ink for the image part of the printing plate transferred to the substrate

[0062] Figure 2 For printing proofs Example

[0063] (I) Various embodiments of curing process research and testing

[0064] (1) Preparation of color paste

[0065] The pigment, monomer and dispersant were mixed in a certain proportion, stirred with a glass rod for 2 to 3 minutes for preliminary dispersion, and then pre-dispersed for 30 minutes using a stirrer connected with a polytetrafluoroethylene stirring rod, and finally 1 / 3 of the volume of the color paste was added with zirconium oxide beads and ground for 2.5 hours to prepare the color paste. Among them, cyan and black pigments were ground with 0.1mm particle size zirconium oxide beads, and magenta and yellow pigments were ground with 0.4mm particle size zirconium oxide beads.

[0066]

[0067] (2) Preparation of ink

[0068]

[0069] (3) EB curing

[0070] Double bond conversion rate under different irradiation doses:

[0071]

[0072] (1) Preparation of color paste

[0073] Same recipe as above

[0074] (2) Preparation of ink

[0075] Same recipe as above

[0076] (3) Double bond conversion rate after multiple irradiations

[0077]

[0078]

[0079] In Examples 1-3, 30 kGy of irradiation was applied at one time, and the double bond conversion rate was 85.2%. Continuing to increase the irradiation dose (Example 1-4) could only increase the conversion rate to 97.1%. However, when the 30 kGy irradiation was implemented in 6 times, the double bond conversion rate could be as high as 98.9%, indicating that this method can significantly improve the ink film curing effect, while reducing the power and energy consumption of the electron beam curing equipment, which is beneficial to energy conservation and emission reduction.

[0080] (1) Preparation of color paste

[0081] Same recipe as above

[0082] (2) Preparation of ink

[0083] Same recipe as above

[0084] (3) Test results

[0085]

[0086] It was found that compared with room temperature of 20°C, heating the sample to be tested at 30-60°C for one minute before curing can reduce the EB irradiation dose required for curing. The required irradiation dose was lowest when heated to 40°C and 50°C, saving the life of the electron beam equipment and energy consumption. Moreover, 30 to 60 degrees is a temperature that both plastic substrates and inks can withstand, and will not damage the printed sheets.

[0087] (II) Examples of research and testing of different oligomer types

[0088] (1) Preparation of color paste

[0089] Same recipe as above

[0090] (2) Preparation of ink

[0091] See the following table for the recipe

[0092] (3) Test results

[0093]

[0094]

[0095] Based on the above data, it can be seen that EB150 and EM6215-100 have better effects, and the other four oligomers require larger irradiation doses.

[0096] (III) The influence of different monomers on the required curing dosage

[0097]

[0098] From the perspective of irradiation dose, ACMO is superior to other monomers, reaching or even exceeding the double bond conversion rate produced by other monomers at a lower irradiation dose of 25kGy.

[0099] (IV) Effect of the ratio of prepolymer to monomer on curing effect

[0100] (1) Preparation of color paste

[0101] Same recipe as above

[0102] (2) Preparation of ink

[0103] See the following table for the recipe

[0104] (3) Test results

[0105]

[0106] Under the same irradiation dose of 20 kGy, the double bond conversion rate was measured, and it was found that under the same irradiation dose, the double bond conversion rate was highest when the ratio of oligomer to monomer was about 1:2.

[0107] (V) Selection of oligomers in cyan ink:

[0108] (1) Preparation of color paste

[0109] Same recipe as above

[0110] (2) Preparation of ink

[0111] See the following table for the recipe

[0112] (3) Test results

[0113]

[0114]

[0115] It can be seen that when EM6215-100 or EB150 is used alone, the radiation dose required for curing is the lowest, and the adhesion rating reaches or even exceeds the effect brought by other oligomers, and the overall effect is good.

[0116] (VI) Monomer selection in cyan ink:

[0117] (1) Preparation of color paste

[0118] Same recipe as above

[0119] (2) Preparation of ink

[0120] The formula is shown in the table below (3) Test results

[0121]

[0122]

[0123]

[0124] Among them, the fixed color paste accounts for 25 parts, the fixed oligomer EB150 accounts for 6.4 parts, and the four monomers ACMO, EOEOEA, DPGDA, and TMPTA, used alone or in combination, total 68 parts.

[0125] It was found that using EOEOEA alone can significantly improve adhesion, and using ACMO alone can significantly improve leveling.

[0126]

[0127] EOEOEA and ACMO were mixed, with a total of 68 parts, and the ratio of the two was changed to approximately 58:42, 50:50, 40:60, and 60:40. It was found that when the ratio of EOEOEA to ACMO was approximately 58:42, 50:50, and 40:60, the radiation dose required for curing was lower, and the leveling property reached the first level; when the ratio of EOEOEA to ACMO was approximately 58:42, the comprehensive performance was the best.

[0128] (VII) Selection of leveling agent in cyan ink:

[0129] (1) Preparation of color paste

[0130] Same recipe as above

[0131] (2) Preparation of ink

[0132] See the table below for the recipe

[0133] (3) Test results

[0134]

[0135]

[0136] By comparison, it is found that the use of any leveling agent can reduce the surface tension of the ink, improve the wettability of the ink to the substrate, and prevent the occurrence of poor leveling.

[0137] When the proportion of leveling agent is 0.2, compared with BYK394, TEGO 432 and ETERAD 4613 can significantly reduce the surface tension of ink and improve the leveling property, but ETERAD 4613 has no improvement on adhesion, so TEGO432 is the optimal leveling agent.

[0138] Changing the TEGO 432 content, when the content is 0.2, both adhesion and leveling properties are the best results.

[0139] (VIII) Optimal formulation of cyan oil

[0140] (1) Preparation of color paste

[0141] Same recipe as above

[0142] (2) Preparation of ink

[0143] See the table below for the recipe

[0144] (3) Test results

[0145]

[0146]

[0147] In the above embodiment, the total number of all components is 100 parts, and the number of cyan color paste is changed. The number of leveling agents is fixed at 0.2 parts, the ratio of oligomers and mixed monomers is approximately 1:2, and the ratio of EOEOEA and ACMO in the mixed monomers is approximately 58:42. When the number of cyan color paste is 60 parts, the color density of the printed sample meets the color density reference value of general printed products in CY / T 6-1991.

[0148] All properties measured in Example 8-1 are as follows, which meet the requirements of gravure printing process on plastic substrate surface, and heating treatment before irradiation can reduce the irradiation dose

[0149]

[0150] (IX) Yellow / black ink formula optimization:

[0151] (1) Preparation of color paste

[0152] The recipe is as follows

[0153]

[0154] (2) Preparation of ink

[0155] See the table below for the recipe

[0156] (3) Test results

[0157]

[0158] In the above embodiment, the total number of all components is 100 parts, and the number of color pastes is changed. The number of leveling agents is fixed at 0.2 parts, the ratio of oligomers and mixed monomers is approximately 1:2, and the ratio of EOEOEA and ACMO in the mixed monomers is approximately 58:42. For yellow ink, when the number of yellow color pastes is 40 parts, the color density of the printed sample meets the color density reference value of fine prints and general prints in CY / T 6-1991; for black ink, when the number of black color pastes is 40 parts, the color density of the printed sample meets the color density reference value of fine prints in CY / T 6-1991.

[0159] All properties of Example 9-1 and Example 9-4 are as follows, which meet the requirements of the gravure printing process on the surface of the plastic substrate.

[0160]

[0161] (X) Optimization of magenta ink formula: (1) Preparation of color paste

[0162] The recipe is as follows

[0163]

[0164] (2) Preparation of ink

[0165] See the table below for the recipe

[0166] (3) Test results

[0167]

[0168]

[0169] It can be seen that both oligomer EM6215-100 and EB150 can achieve good comprehensive effects. Considering the effect of the viscosity of the oligomer on the ink, EB150 with lower viscosity is selected to prepare magenta ink.

[0170] The total number of all components in the magenta ink is 100 parts, and the number of color pastes is changed. In order to further reduce the viscosity of the system, the ratio of oligomer EB150 to mixed monomer is 1:7, the ratio of EOEOEA and ACMO in the mixed monomer is approximately 58:42, and the number of leveling agents is fixed at 0.2 parts.

[0171] When the magenta color paste is 60 parts and 50 parts, the color density of the printed sample can meet the color density reference values ​​of fine prints and general prints in CY / T 6-1991.

[0172]

[0173] All properties measured in Example 10-1 are as follows, which meet the requirements of the gravure printing process on the surface of the plastic substrate.

[0174] (XI) Four-color ink matching and test performance data

[0175]

[0176]

[0177] The present invention has been described in detail, including its preferred embodiments. However, after considering this disclosure, those skilled in the art may make modifications and / or improvements to the present invention that fall within the scope and spirit of the present invention.

Claims

1. An electron beam radiation curable gravure printing ink, characterized in that: Prepared from the following components: (1) prepolymer, wherein the prepolymer is EB811, EB870, EB150, CN9013NS, EM6215-100, One or more of EM6325-100; (2) Monomers: acryloyl morpholine (ACMO), ethoxyethyl acrylate (EOEOEA), 1,6-hexanediol diacrylate (HDDA), dipropylene glycol diacrylate (DPGDA), neopentyl glycol acrylate (NPGDA), One or more of tripropylene glycol diacrylate (TPGDA), trimethylolpropane triacrylate (TMPTA); (3) a pigment paste, wherein the pigment comprises one of phthalocyanine blue 8560, yellow #12, purple red LH-7758, and non-grinding black LH-SF03B; (4) Leveling agent.

2. An electron beam radiation curable gravure printing ink according to claim 1, wherein the prepolymer is one of EM6215-100 and EB150.

3. An electron beam radiation curable gravure printing ink according to claim 1, wherein the flattening agent is one or more of TEGO 432, BYK 394, and ETERAD 4613.

4. An electron beam radiation curable gravure printing ink as claimed in claim 1, wherein the monomer is a mixture of ACMO and EOEOEA, and the ratio of the two is 4:6-6:

4.

5. An electron beam radiation curable gravure printing ink as claimed in claim 1, wherein the prepolymer is 4-30 parts, the monomer is 8-70 parts, and the leveling agent is 0.1-0.5 parts.

6. A method for preparing the electron beam radiation curable gravure printing ink according to claim 1, characterized in that: The following steps are involved: (1) Preparing a color paste: mixing the pigment, monomer, and dispersant in proportion, stirring and dispersing for 30-60 minutes, and finally adding zirconium oxide beads and grinding for 30-75 minutes to prepare a color paste; (2) The prepared color paste is mixed with oligomers, monomers and additives in proportion, stirred for 15-60 minutes and then allowed to stand at room temperature for 6-12 hours to obtain EB gravure ink.

7. A method for preparing the electron beam radiation curable gravure printing ink according to claim 6, wherein the ratio of the oligomer to the monomer is 1:2-1:

7.

8. A curing method for electron beam radiation curing gravure printing ink according to claim 1, characterized in that: The specified radiation dose is divided into 2-6 times for irradiation.

9. A curing method for electron beam radiation curing gravure printing ink according to claim 8, wherein the specified amount of electron beam energy is 100-160 keV and the irradiation dose is 10-150 kGy.

10. A curing method for electron beam radiation curing gravure printing ink according to claim 8, wherein before curing, the printed sample is kept at 30-60°C for about 1 minute.

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