Flexographic ink for cigarette packaging paper and preparation method thereof

Abstract

The present invention relates to a flexographic ink for cigarette packaging paper and a preparation method thereof. The flexographic ink comprises the following ingredients, calculated by weight: 45-65 parts of polyurethane acrylate, 15-30 parts of 1,6-hexanediol diacrylate, 10-20 parts of 2-phenoxyethyl acrylate, 8-16 parts of lauric acid methacrylate, 5-20 parts of a filler modifier, 0.1-10 parts of a pigment, 0.1-1 parts of a dispersant, 0.1-1 parts of a defoamer, and 3.1-6.2 parts of a photoinitiator. The present invention prepares a UV flexible ink that not only exhibits excellent gloss but also has higher surface hardness, wear resistance, and adhesion than traditional UV inks, making it ideal for printing on high-end cigarette packaging paper.

Description

Technical Field

[0001] The present invention relates to the field of inks, and in particular to a flexographic ink for cigarette packaging paper and a preparation method thereof. Background Art

[0002] Cigarette wrapping paper is a special type of paper used to wrap cigarettes and provide a visually appealing appearance. The printed effect on cigarette wrapping paper creates a direct visual impact on consumers, making the product more appealing. Flexographic printing is typically used for cigarette paper outer packaging. Flexographic printing is virtually pollution-free during its production process, and its printing, platemaking, and process management are more environmentally friendly than other printing methods. Therefore, flexographic printing is widely accepted as a green printing method worldwide. Flexible inks primarily include water-based flexible inks, solvent-based flexible inks, UV flexible inks, and flexible varnishes applied through flexographic printing.

[0003] UV ink, an environmentally friendly ink that has rapidly developed in recent years, has rapidly captured the cigarette packaging paper market with its instant curing, lack of volatile solvents, and ease of application. UV inks include specialty packaging inks such as UV matte, UV ice flower, UV foaming, UV wrinkle, UV embossing, UV refractive, UV gem, UV light-fixing ink, and UV varnish. While UV inks offer high gloss, the films they form after curing suffer from deficiencies in abrasion and corrosion resistance. These performance limitations limit their application in cigarette packaging paper. Summary of the Invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide a flexographic ink for cigarette packaging paper and a preparation method thereof.

[0005] The purpose of the present invention is achieved by adopting the following technical solutions:

[0006] In a first aspect, the present invention provides a flexographic ink for cigarette packaging paper, comprising the following components, calculated in parts by weight:

[0007] 45-65 parts of polyurethane acrylate, 15-30 parts of 1,6-hexanediol diacrylate, 10-20 parts of 2-phenoxyethyl acrylate, 8-16 parts of lauric acid methacrylate, 5-20 parts of filler modifier, 0.1-10 parts of pigment, 0.1-1 part of dispersant, 0.1-1 part of defoamer and 3.1-6.2 parts of photoinitiator.

[0008] Preferably, the brand of the polyurethane acrylate (PUA) is one of UV-1205, UV-1230, and UV-1990.

[0009] Preferably, the filling modifier is a product obtained by first combining aminated allophane nanotubes with allyl glycidyl ether to obtain modified allophane nanotubes, and then reacting and combining with 2-mercaptobenzothiazole.

[0010] Preferably, the pigment is an organic pigment, including at least one of phthalocyanine red, phthalocyanine blue, phthalocyanine green, permanent yellow, and permanent violet.

[0011] Preferably, the dispersant is at least one of TEGO-655, TEGO-688, TEGO-685, and TEGO-755W.

[0012] Preferably, the defoaming agent is at least one of BYK-012, BYK-085, BYK-1794, and BYK-024.

[0013] Preferably, the photoinitiator is at least one of hydroxycyclohexane phenone (photoinitiator 184), 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester (photoinitiator TPO-L), and 2-hydroxy-2-methyl-1-phenyl-1-propanone (photoinitiator 1173).

[0014] Preferably, the preparation method of the filling modifier comprises the following steps:

[0015] S1. Mixing hydrous allophane nanotubes with anhydrous ethanol, adding 3-aminopropyltriethoxysilane, and then refluxing at 50-70° C. for 3-10 hours. After the treatment, centrifuging in a centrifuge to collect the precipitate, then rinsing the precipitate three times with anhydrous ethanol and drying it in a vacuum oven to obtain ammoniated hydrous allophane nanotubes;

[0016] S2. Add allyl glycidyl ether to toluene, stir and dissolve evenly, then add amination-modified allophane nanotubes, disperse evenly at room temperature, and then place in a 60-70°C water bath and stir at a speed of 150-250 r / min for 5-10 hours. After the reaction is completed, remove the solvent under reduced pressure, rinse with anhydrous ethanol three times, and then place in a vacuum oven for drying to obtain modified allophane nanotubes;

[0017] S3. Add 2-mercaptobenzothiazole to chloroform, stir until uniformly dissolved, then add modified hydroalophane nanotubes, stir evenly at room temperature, and then use nitrogen as a protective gas, under the conditions of ultraviolet light and photoinitiator, stir and react for 1-2 hours. After the reaction is completed, remove the solvent under reduced pressure, wash three times with anhydrous ethanol, and place in a vacuum oven for drying to obtain a filling modifier.

[0018] Preferably, the particle size of the allophane nanotubes is 100±10 nm, the SiO2 content is greater than 28%, the Al2O3 content is greater than 56%, and the density is 1.86-1.88 g / cm 3 , purchased from Shandong Qiying Nanotechnology Co., Ltd.

[0019] In the S1, the mass-to-volume ratio of the allophane nanotubes, 3-aminopropyltriethoxysilane, and anhydrous ethanol is 1 g: (0.3-0.6) g: (15-35) mL.

[0020] Preferably, in S2, the mass volume ratio of amination-modified allophane nanotubes, allyl glycidyl ether and toluene is (1.1-1.5) g: (0.22-0.44) g: (20-40) mL.

[0021] Preferably, in S3, the mass volume ratio of the modified allophane nanotubes, 2-mercaptobenzothiazole and chloroform is (1.2-1.8) g: (0.34-0.68) g: (30-50) mL.

[0022] Preferably, in S3, the irradiation intensity of the ultraviolet light is 1.2-2.4 mW / cm 2 The photoinitiator is benzoin dimethyl ether or benzoin diethyl ether, and the added mass is 3%-8% of the mass of the modified allophane nanotubes.

[0023] In a second aspect, the present invention provides a method for preparing flexographic ink for cigarette packaging paper, comprising the following steps:

[0024] (1) First, weighed polyurethane acrylate, 1,6-hexanediol diacrylate, 2-phenoxyethyl acrylate, and lauric acid methacrylate are mixed and stirred uniformly to obtain a first mixed solution;

[0025] (2) adding the weighed filler modifier, pigment, dispersant, and defoamer to the first mixed solution in sequence, and grinding and sieving the mixture to obtain a second mixed solution;

[0026] (3) Finally, the weighed photoinitiator is added to the second mixed solution, and the mixture is stirred evenly again to obtain flexographic ink for cigarette packaging paper.

[0027] The beneficial effects of the present invention are:

[0028] 1. The present invention prepares a UV flexible ink, which not only has excellent gloss, but also has higher surface hardness, tinting power and adhesion than traditional UV inks, and is very suitable for printing on high-end cigarette packaging paper.

[0029] 2. The UV flexible ink prepared by the present invention uses acrylate as the main raw material, including the specially selected polyurethane acrylate, 1,6-hexanediol diacrylate, 2-phenoxyethyl acrylate, and lauric acid methacrylate. The ink obtained by compounding these four different types of acrylates can achieve the advantages of fast drying, good gloss, no pollution, and high printing quality.

[0030] 3. The filler modifier used in the present invention functions as both a filler and a modifier. It is prepared by first combining amino-modified allophane nanotubes with allyl glycidyl ether to form modified allophane nanotubes, which are then reacted and combined with 2-mercaptobenzothiazole. This filler modifier, when used in UV flexible inks, significantly improves the ink's surface hardness, colorability, and corrosion resistance.

[0031] 4. The 2-mercaptobenzothiazole used in the preparation of the filling modifier is a type of rubber accelerator. The benzothiazole group is generally composed of a benzene ring and a thiazole ring, has high stability, and is not prone to redox reactions. The present invention introduces it into the filling modifier via a mercapto-double bond, thereby giving the filling modifier better stability and corrosion resistance. In addition, testing has also found that it has a certain improvement in the surface hardness and tinting strength of the ink. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is described below through specific examples. It should be understood that the one or more method steps mentioned in the present invention do not exclude the presence of other method steps before and after the combination step or the insertion of other method steps between these explicitly mentioned steps; it should also be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. Moreover, unless otherwise specified, the numbering of each method step is only a convenient tool for identifying each method step, and is not intended to limit the order of arrangement of each method step or to define the scope of the present invention. Changes or adjustments in their relative relationships, without substantially changing the technical content, should also be regarded as the scope of the present invention.

[0033] In order to better understand the above technical solutions, exemplary embodiments of the present invention are described in more detail below. Although exemplary embodiments of the present invention are shown, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0034] The parameters of the allophane used in the present invention are: the particle size of the allophane nanotubes is 100±10nm, the SiO2 content is greater than 28%, the Al2O3 content is greater than 56%, and the density is 1.86-1.88g / cm3 , purchased from Shandong Qiying Nanotechnology Co., Ltd.

[0035] The present invention will be further described below with reference to the following examples.

[0036] Example 1

[0037] A flexographic printing ink for cigarette packaging paper, comprising the following components, calculated in parts by weight:

[0038] 55 parts of polyurethane acrylate, 21 parts of 1,6-hexanediol diacrylate, 15 parts of 2-phenoxyethyl acrylate, 12 parts of lauric acid methacrylate, 12 parts of filler modifier, 2.7 parts of pigment, 0.6 parts of dispersant, 0.6 parts of defoamer and 4.6 parts of photoinitiator.

[0039] Among them, the brand of polyurethane acrylate (PUA) is UV-1205; the pigment is phthalocyanine red; the dispersant is TEGO-655; the defoaming agent is BYK-012; and the photoinitiator is hydroxycyclohexane phenone (photoinitiator 184).

[0040] The preparation method of the filling modifier comprises the following steps:

[0041] S1. 1 g of allophane nanotubes was mixed with 25 mL of anhydrous ethanol, and 0.4 g of 3-aminopropyltriethoxysilane was added. The mixture was then refluxed at 60° C. for 7 h. After the treatment, the precipitate was collected by centrifugation in a centrifuge. The precipitate was then rinsed three times with anhydrous ethanol and dried in a vacuum oven to obtain ammoniated allophane nanotubes.

[0042] S2. Add 0.33 g of allyl glycidyl ether to 30 mL of toluene, stir and dissolve evenly, then add 1.3 g of amino-modified allophane nanotubes, disperse evenly at room temperature, and then place in a 65°C water bath and stir at a speed of 200 r / min for 7 h. After the reaction is completed, remove the solvent under reduced pressure, rinse with anhydrous ethanol three times, and then place in a vacuum oven for drying to obtain modified allophane nanotubes;

[0043] S3. Add 0.51 g of 2-mercaptobenzothiazole to 40 mL of chloroform and stir until uniformly dissolved. Then add 1.5 g of modified allophane nanotubes and stir evenly at room temperature. Then, use nitrogen as a protective gas and add 5% of the weight of the modified allophane nanotubes, benzoin dimethyl ether, as an initiator. Stir and react under ultraviolet light at an irradiation intensity of 1.8 mW / cm 2 The stirring reaction time is 1.5 hours. After the reaction is completed, the solvent is removed under reduced pressure, washed three times with anhydrous ethanol, and placed in a vacuum box for drying to obtain a filling modifier.

[0044] The method for preparing the flexographic ink for cigarette packaging paper comprises the following steps:

[0045] (1) First, weighed polyurethane acrylate, 1,6-hexanediol diacrylate, 2-phenoxyethyl acrylate, and lauric acid methacrylate are mixed and stirred uniformly to obtain a first mixed solution;

[0046] (2) adding the weighed filler modifier, pigment, dispersant, and defoamer to the first mixed solution in sequence, and grinding and sieving the mixture to obtain a second mixed solution;

[0047] (3) Finally, the weighed photoinitiator is added to the second mixed solution, and the mixture is stirred evenly again to obtain flexographic ink for cigarette packaging paper.

[0048] Example 2

[0049] A flexographic printing ink for cigarette packaging paper, comprising the following components, calculated in parts by weight:

[0050] 45 parts of polyurethane acrylate, 15 parts of 1,6-hexanediol diacrylate, 10 parts of 2-phenoxyethyl acrylate, 8 parts of lauric acid methacrylate, 5 parts of filler modifier, 1.8 parts of pigment, 0.2 parts of dispersant, 0.3 parts of defoamer and 3.1 parts of photoinitiator.

[0051] Among them, the brand of polyurethane acrylate (PUA) is UV-1230; the pigment is phthalocyanine blue; the dispersant is TEGO-688; the defoamer is BYK-085; and the photoinitiator is ethyl 2,4,6-trimethylbenzoylphenylphosphonate (photoinitiator TPO-L).

[0052] The preparation method of the filling modifier comprises the following steps:

[0053] S1. 1 g of allophane nanotubes was mixed with 15 mL of anhydrous ethanol, and 0.3 g of 3-aminopropyltriethoxysilane was added. The mixture was then refluxed at 50° C. for 3 h. After the treatment, the precipitate was collected by centrifugation in a centrifuge. The precipitate was then rinsed three times with anhydrous ethanol and dried in a vacuum oven to obtain ammoniated allophane nanotubes.

[0054] S2. Add 0.22 g of allyl glycidyl ether to 20 mL of toluene, stir and dissolve evenly, then add 1.1 g of amino-modified allophane nanotubes, disperse evenly at room temperature, and then place in a 60°C water bath with stirring at a speed of 150 r / min for 5 h. After the reaction is completed, remove the solvent under reduced pressure, rinse with anhydrous ethanol three times, and then place in a vacuum oven for drying to obtain modified allophane nanotubes;

[0055] S3. Add 0.34 g of 2-mercaptobenzothiazole to 30 mL of chloroform and stir until uniformly dissolved. Then add 1.2 g of modified allophane nanotubes and stir evenly at room temperature. Then, using nitrogen as a protective gas, add 3% of the weight of the modified allophane nanotubes as an initiator, benzoin dimethyl ether, and stir the reaction under ultraviolet light for 1 hour. The ultraviolet light irradiation intensity is 1.2 mW / cm 2 After the reaction is completed, the solvent is removed under reduced pressure, the product is washed three times with anhydrous ethanol, and dried in a vacuum box to obtain a filling modifier.

[0056] The method for preparing the flexographic ink for cigarette packaging paper comprises the following steps:

[0057] (1) First, weighed polyurethane acrylate, 1,6-hexanediol diacrylate, 2-phenoxyethyl acrylate, and lauric acid methacrylate are mixed and stirred uniformly to obtain a first mixed solution;

[0058] (2) adding the weighed filler modifier, pigment, dispersant, and defoamer to the first mixed solution in sequence, and grinding and sieving the mixture to obtain a second mixed solution;

[0059] (3) Finally, the weighed photoinitiator is added to the second mixed solution, and the mixture is stirred evenly again to obtain flexographic ink for cigarette packaging paper.

[0060] Example 3

[0061] A flexographic printing ink for cigarette packaging paper, comprising the following components, calculated in parts by weight:

[0062] 65 parts of polyurethane acrylate, 30 parts of 1,6-hexanediol diacrylate, 20 parts of 2-phenoxyethyl acrylate, 16 parts of lauric acid methacrylate, 20 parts of filler modifier, 5.8 parts of pigment, 0.8 parts of dispersant, 0.9 parts of defoamer and 6.2 parts of photoinitiator.

[0063] Among them, the brand of polyurethane acrylate (PUA) is UV-1990; the pigment is phthalocyanine green; the dispersant is TEGO-755W; the defoamer is BYK-024; and the photoinitiator is 2-hydroxy-2-methyl-1-phenyl-1-propanone (photoinitiator 1173).

[0064] The preparation method of the filling modifier comprises the following steps:

[0065] S1. 1 g of allophane nanotubes was mixed with 35 mL of anhydrous ethanol, and 0.6 g of 3-aminopropyltriethoxysilane was added. The mixture was then refluxed at 70° C. for 10 h. After the treatment, the precipitate was collected by centrifugation in a centrifuge. The precipitate was then rinsed three times with anhydrous ethanol and dried in a vacuum oven to obtain ammoniated allophane nanotubes.

[0066] S2. Add 0.44 g of allyl glycidyl ether to 40 mL of toluene, stir and dissolve evenly, then add 1.5 g of amino-modified allophane nanotubes, disperse evenly at room temperature, and then place in a 70°C water bath with stirring at a speed of 250 r / min for 10 h. After the reaction is completed, remove the solvent under reduced pressure, rinse with anhydrous ethanol three times, and then place in a vacuum oven for drying to obtain modified allophane nanotubes;

[0067] S3. Add 0.68 g of 2-mercaptobenzothiazole to 50 mL of chloroform and stir until uniformly dissolved. Then add 1.8 g of modified allophane nanotubes and stir evenly at room temperature. Then, using nitrogen as a protective gas, add 8% of the weight of the modified allophane nanotubes as an initiator, benzoin diethyl ether, and stir the reaction under ultraviolet light for 2 h. The irradiation intensity of the ultraviolet light is 2.4 mW / cm 2 After the reaction is completed, the solvent is removed under reduced pressure, the product is washed three times with anhydrous ethanol, and dried in a vacuum box to obtain a filling modifier.

[0068] The method for preparing the flexographic ink for cigarette packaging paper comprises the following steps:

[0069] (1) First, weighed polyurethane acrylate, 1,6-hexanediol diacrylate, 2-phenoxyethyl acrylate, and lauric acid methacrylate are mixed and stirred uniformly to obtain a first mixed solution;

[0070] (2) adding the weighed filler modifier, pigment, dispersant, and defoamer to the first mixed solution in sequence, and grinding and sieving the mixture to obtain a second mixed solution;

[0071] (3) Finally, the weighed photoinitiator is added to the second mixed solution, and the mixture is stirred evenly again to obtain flexographic ink for cigarette packaging paper.

[0072] Comparative Example 1

[0073] A flexographic ink for cigarette packaging paper differs from Example 1 in that the filler modifier is replaced by allophane nanotubes, and other components and preparation methods are the same as those in Example 1.

[0074] Comparative Example 2

[0075] A flexographic ink for cigarette packaging paper differs from Example 1 in that the filler modifier is replaced by aminated allophane nanotubes, and other ingredients and preparation methods are the same as those in Example 1.

[0076] Comparative Example 3

[0077] A flexographic ink for cigarette wrapping paper differs from Example 1 in that the filler modifier is replaced by a mixture of allophane nanotubes and 2-mercaptobenzothiazole, the mass ratio of allophane nanotubes to 2-mercaptobenzothiazole being 1.5:0.51 g. Other ingredients and preparation methods are the same as those in Example 1.

[0078] Experimental testing

[0079] The UV ink prepared in Example 1 and Comparative Examples 1-3 was applied to the surface of the substrate by flexographic printing, and then placed under 800 mW / cm 2 The ink was dried under ultraviolet light at a temperature of 45°C for 5 seconds, and the performance of the dried and cured UV ink was tested accordingly.

[0080] Test items include: tinting strength, adhesion, surface hardness, and corrosion resistance. The reference standard for tinting strength testing is GB / T14624.2-2008; the reference standard for adhesion testing is GB / T 9286-1998; and the reference standard for surface hardness testing is GB / T6739-2006. Acid resistance testing is performed by immersing the ink in a 5% hydrochloric acid solution for 24 hours, removing it and drying it, and observing whether the ink has any discoloration, shedding, or cracking (severity: large > small > slight > no abnormality). Alkali resistance testing is performed by immersing the ink in a 1% sodium hydroxide solution for 24 hours, removing it and drying it, and observing whether the ink has any discoloration, shedding, or cracking (severity: large > small > slight > no abnormality). The test results are shown in Table 1:

[0081] Table 1 Ink testing results

[0082]

[0083] As shown in Table 1 above, the flexographic ink prepared in Example 1 of the present invention not only exhibits strong tinting strength, but also excellent adhesion and acid and alkali resistance, indicating strong color fixation. Furthermore, it exhibits high surface hardness, indicating excellent abrasion resistance. In summary, the flexographic ink prepared in Example 1 outperforms traditional UV inks in overall performance and is highly suitable for printing on high-end cigarette packaging paper.

[0084] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0085] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A flexographic ink for cigarette packaging paper, characterized in that: Calculated by weight, it includes the following ingredients: 45-65 parts of polyurethane acrylate, 15-30 parts of 1,6-hexanediol diacrylate, 10-20 parts of 2-phenoxyethyl acrylate, 8-16 parts of lauric acid methacrylate, 5-20 parts of filler modifier, 0.1-10 parts of pigment, 0.1-1 part of dispersant, 0.1-1 part of defoamer and 3.1-6.2 parts of photoinitiator; The filler modifier is a product obtained by first combining ammoniated allophane nanotubes with allyl glycidyl ether to obtain modified allophane nanotubes, and then reacting and combining with 2-mercaptobenzothiazole; The preparation method of the filling modifier comprises the following steps: S1. Dissolving allophane nanotubes in anhydrous ethanol, adding 3-aminopropyltriethoxysilane, and refluxing at 50-70° C. for 3-10 hours. After the treatment, centrifuging, washing, and drying to obtain amination-modified allophane nanotubes. S2. Add allyl glycidyl ether to toluene, stir and dissolve evenly, then add amination-modified allophane nanotubes, disperse evenly at room temperature, and then place in a 60-70°C water bath and stir at a speed of 150-250 r / min for 5-10 hours. After the reaction is completed, remove the solvent under reduced pressure, wash and dry to obtain modified allophane nanotubes; S3, adding 2-mercaptobenzothiazole to chloroform, stirring until uniformly dissolved, then adding modified allophane nanotubes, stirring evenly at room temperature, and then using nitrogen as a protective gas, stirring under ultraviolet light and a photoinitiator, reacting for 1-2 hours. After the reaction is completed, removing the solvent under reduced pressure, washing and drying to obtain a filling modifier; In S1, the mass volume ratio of allophane nanotubes, 3-aminopropyltriethoxysilane and anhydrous ethanol is 1 g: (0.3-0.6) g: (15-35) mL; In S2, the mass volume ratio of amination-modified allophane nanotubes, allyl glycidyl ether, and toluene is (1.1-1.5) g: (0.22-0.44) g: (20-40) mL; In the S3, the mass volume ratio of the modified allophane nanotubes, 2-mercaptobenzothiazole and chloroform is (1.2-1.8) g: (0.34-0.68) g: (30-50) mL.

2. The flexographic ink for cigarette packaging paper according to claim 1, characterized in that: The polyurethane acrylate has a brand name of UV-1205, UV-1230, and UV-1990.

3. The flexographic ink for cigarette packaging paper according to claim 1, characterized in that: The pigment is an organic pigment, including at least one of phthalocyanine red, phthalocyanine blue, phthalocyanine green, permanent yellow and permanent violet.

4. The flexographic ink for cigarette packaging paper according to claim 1, characterized in that: The dispersant is at least one of TEGO-655, TEGO-688, TEGO-685, and TEGO-755W.

5. The flexographic ink for cigarette packaging paper according to claim 1, characterized in that: The defoaming agent is at least one of BYK-012, BYK-085, BYK-1794, and BYK-024.

6. The flexographic ink for cigarette packaging paper according to claim 1, characterized in that: The photoinitiator is at least one of hydroxycyclohexane phenone, 2,4,6-trimethylbenzoylphenyl phosphonic acid ethyl ester, and 2-hydroxy-2-methyl-1-phenyl-1-propanone.

7. A method for preparing the flexographic ink for cigarette packaging paper according to claim 1, characterized in that: The following steps are involved: (1) First, weighed polyurethane acrylate, 1,6-hexanediol diacrylate, 2-phenoxyethyl acrylate, and lauric acid methacrylate are mixed and stirred uniformly to obtain a first mixed solution; (2) Add the weighed filler modifier, pigment, dispersant, and defoamer to the first mixed solution in sequence, and grind and sieve the mixture to obtain a second mixed solution; (3) Finally, the weighed photoinitiator is added to the second mixed solution, and the mixture is stirred evenly again to obtain flexographic ink for cigarette packaging paper.

Images