Water-based ink for cigarette packaging paper and preparation method thereof

Abstract

The present invention relates to the field of inks, and more particularly to a water-based ink for cigarette wrapping paper and a preparation method thereof. The water-based ink comprises, by weight, 22-46 parts of an aqueous acrylic emulsion, 15-27 parts of an aqueous polyurethane acrylate emulsion, 8-16 parts of a modified filler, 1-10 parts of a pigment, 0.2-2 parts of a dispersant, 0.1-1 parts of a defoamer, 0.5-1.5 parts of a leveling agent, 2-6 parts of a film-forming aid, and 15-30 parts of deionized water. By introducing the modified filler into the water-based ink, the present invention not only has better gloss and tinting power than traditional fillers, but also has better light fastness, making the ink color more beautiful and the texture more vivid, thereby significantly enhancing the aesthetics of the print.

Description

Technical Field

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

[0002] Currently, the cigarette packaging and printing industry primarily uses alcohol-based gravure inks. These inks utilize significant amounts of alcohol and ester solvents. While these inks meet the requirements for cigarette label printing, they contain significant amounts of organic solvents. During actual operation, inhalation of these volatilized organic solvents can cause discomfort and harm to operators, while also polluting the surrounding environment. With the continuous improvement of people's living standards, environmental protection and green practices have become a major trend in the printing and packaging industry. Compared to organic solvent-based inks, water-based inks are increasingly popular due to their extremely low VOC content, thus minimizing the risk to users.

[0003] Water-based ink, also known as liquid ink, is primarily made from a composite grinding process of water-soluble resins, organic pigments, water, and related additives. It is particularly suitable for packaging and printing products with strict hygiene requirements, such as cigarettes, alcohol, food, and toys. However, compared to organic solvent-based inks, existing water-based inks exhibit inferior gloss, tinting strength, and lightfastness. This results in dull and faded designs on cigarette wrappers, failing to meet the quality requirements of high-end cigarette wrappers. Therefore, there is a need to develop a water-based ink with high gloss, excellent color, and lightfastness suitable for high-end cigarette wrappers. Summary of the Invention

[0004] In view of the problems existing in the prior art, the present invention aims to provide a water-based 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 water-based ink for cigarette packaging paper, which comprises, calculated in parts by weight:

[0007] 22-46 parts of water-based acrylic emulsion, 15-27 parts of water-based polyurethane acrylate emulsion, 8-16 parts of modified filler, 1-10 parts of pigment, 0.2-2 parts of dispersant, 0.1-1 parts of defoaming agent, 0.5-1.5 parts of leveling agent, 2-6 parts of film-forming aid and 15-30 parts of deionized water.

[0008] Preferably, the water-based acrylic emulsion is of the brand Hypomer AC-2518 or Hypomer AC-7450; more preferably Hypomer AC-2518, with a viscosity of 1000-1500 cps, a solid content of 46%-48%, and a pH of 8.5-9.0.

[0009] Preferably, the waterborne polyurethane acrylate emulsion has a brand name of PUA-2922, a viscosity of 1500-2000 cps, a solid content of 36%-38%, and a pH of 7.5-8.5.

[0010] Preferably, the modified filler is prepared by combining glycidyl-modified allophane particles with modified silicone oil, wherein the modified silicone oil is prepared by reacting 3-aminothiophenol and vinyl-terminated dimethylpolysiloxane.

[0011] Preferably, the pigment is an organic pigment, including at least one of phthalocyanine red, phthalocyanine blue, phthalocyanine green, permanent yellow, and permanent violet.

[0012] Preferably, the dispersant is at least one of TEGO-752W, TEGO-760W, and TEGO-745W.

[0013] Preferably, the defoaming agent is at least one of BYK-021, BYK-022, and BYK-024.

[0014] Preferably, the leveling agent is at least one of BYK-333, BYK-345, and BYK-300.

[0015] Preferably, the film-forming aid is at least one of lauryl alcohol ester, propylene glycol ethyl ether, ethylene glycol butyl ether, and propylene glycol butyl ether.

[0016] Preferably, the preparation method of the modified filler comprises:

[0017] S1. Adding allophane particles and (3-glycidyloxypropyl)trimethoxysilane to an ethanol solution, mixing them evenly, and then stirring under reflux, followed by filtering, washing, centrifuging, and drying to obtain glycidyl-modified allophane particles;

[0018] S2, adding 3-aminothiophenol and vinyl-terminated dimethylpolysiloxane to toluene, stirring thoroughly until uniform, adding a photosensitizer, stirring and reacting under ultraviolet light irradiation, and after the reaction is completed, removing the solvent under reduced pressure and drying to obtain a modified silicone oil;

[0019] S3. Add modified silicone oil and modified allophane particles to toluene, stir thoroughly, place in a water bath and heat to 65-85°C, keep warm and stir for 5-15 hours. After the reaction is completed, rotary evaporate, wash, centrifuge and dry to obtain modified allophane particles.

[0020] Preferably, in S1, the particle size of the allophane particles 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.

[0021] Preferably, in S1, the mass volume ratio of the allophane particles, 3-glycidyloxypropyl)trimethoxysilane and the ethanol solution is 1 g: (0.35-0.55) g: (20-40) mL.

[0022] Preferably, in said S1, the mass fraction of the ethanol solution is 20%-80%.

[0023] Preferably, in S1, the reflux temperature is 55-75° C., and the reflux time is 10-15 h.

[0024] Preferably, in S2, the molecular weight of the vinyl-terminated dimethylpolysiloxane is 1500-2500, and the vinyl molar content is 2%-6%.

[0025] Preferably, in S2, the mass volume ratio of 3-aminothiophenol, vinyl-terminated dimethylpolysiloxane and toluene is (0.13-0.26) g: (1.2-1.8) g: (35-55) mL.

[0026] Preferably, in S2, the UV light intensity is 1.3-2.5 mW / cm 2 , the stirring reaction time is 0.6-2.4h.

[0027] Preferably, in S2, the photosensitizer is benzoin dimethyl ether or benzoin diethyl ether, and the usage amount is 3%-8% of the mass of the modified silicone oil.

[0028] Preferably, in S3, the mass volume ratio of the modified silicone oil, the modified allophane particles and toluene is (0.6-1.2) g: (1.2-1.8) g: (35-55) mL.

[0029] In a second aspect, the present invention provides a method for preparing water-based ink for cigarette packaging paper, comprising the following steps:

[0030] (1) placing the modified filler and pigment in a ball mill at a ball milling speed of 250-550 r / min for 2-4 h to obtain a first mixed material;

[0031] (2) mixing an aqueous acrylic emulsion, an aqueous polyurethane acrylate emulsion, and deionized water, stirring them thoroughly, then adding the first mixed material, and stirring them again to obtain a second mixed solution;

[0032] (3) Add the dispersant, defoaming agent, leveling agent and film-forming aid into the second mixed liquid in sequence, and stir thoroughly to obtain water-based ink for cigarette wrapping paper.

[0033] The beneficial effects of the present invention are:

[0034] 1. The present invention prepares a water-based ink suitable for cigarette wrapping paper. The main ingredient of the water-based ink adopts a mixed emulsion of water-based acrylic acid and water-based polyurethane acrylate (WPUA), which can firmly adhere to the cigarette wrapping paper substrate and also has good flexibility and adhesion. The present invention also introduces modified fillers into the water-based ink, which not only has better gloss and tinting power than traditional fillers, but also has better light resistance, making the color of the ink more beautiful and the texture stronger, thereby greatly enhancing the aesthetics of the printing.

[0035] 2. The modified filler prepared by the present invention is based on allophane particles. Although allophane has a small particle size, its surface is covered with numerous pores, resulting in a large specific surface area. The present invention first treats the allophane with glycidyl silane to obtain glycidyl-modified allophane particles, which are then combined with a modified silicone oil containing an amino group. The resulting modified allophane particles, or modified filler, are then used in aqueous inks. The modified filler prepared by this method, when applied to aqueous inks, exhibits excellent bonding with pigments, significantly enhancing pigment brightening and tinting strength, and significantly improving the weather resistance of aqueous inks.

[0036] 3. The modified silicone oil used in the modified filler is prepared from 3-aminothiophenol and vinyl silicone oil (vinyl-terminated dimethylpolysiloxane) through a mercapto-vinyl click chemistry reaction. The modified silicone oil contains not only amino groups but also a large number of thioether groups. The modified filler is then combined with glycidyl-modified allophane particles to produce the modified filler. DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] The particle size of the allophane particles used in the present invention 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 / cm 3 , purchased from Shandong Qiying Nanotechnology Co., Ltd.

[0040] The present invention will be further described below with reference to the following examples.

[0041] Example 1

[0042] A water-based ink for cigarette packaging paper, calculated in parts by weight, comprising:

[0043] 33 parts of water-based acrylic emulsion, 18 parts of water-based polyurethane acrylate emulsion, 12 parts of modified filler, 5 parts of pigment, 1.1 parts of dispersant, 0.5 parts of defoaming agent, 1 part of leveling agent, 4 parts of film-forming aid and 25 parts of deionized water.

[0044] Among them, the brand of water-based acrylic emulsion is Hypomer AC-2518, with a viscosity of 1000-1500 cps, a solid content of 46%-48%, and a pH of 8.5-9.0; the brand of water-based polyurethane acrylate emulsion is PUA-2922, with a viscosity of 1500-2000 cps, a solid content of 36%-38%, and a pH of 7.5-8.5; the pigment is the organic pigment phthalocyanine red; the dispersant is TEGO-752W; the defoamer is BYK-021; the leveling agent is BYK-333; and the film-forming aid is dodecyl alcohol ester.

[0045] The preparation method of the modified filler includes:

[0046] S1. Adding allophane particles and (3-glycidyloxypropyl)trimethoxysilane to a 60 wt% ethanol solution, with a mass volume ratio of allophane particles, (3-glycidyloxypropyl)trimethoxysilane and ethanol solution of 1 g:0.45 g:30 mL, and mixing them uniformly at room temperature. Then, stirring them under reflux in a 65° C. water bath for 12 h, after the treatment is completed, filtering out the liquid, and then washing the particles three times with anhydrous ethanol by centrifugation. After washing, the precipitate is centrifuged and dried to obtain glycidyl-modified allophane particles.

[0047] S2. Add 3-aminothiophenol and vinyl-terminated dimethylpolysiloxane (molecular weight 2000, vinyl content 4 mol%) to toluene in a mass volume ratio of 0.21 g:1.5 g:45 mL of 3-aminothiophenol:vinyl-terminated dimethylpolysiloxane:toluene. After stirring until uniform, add benzoin dimethyl ether in an amount of 5% of the mass of the modified silicone oil. Stir and react under ultraviolet light irradiation at an intensity of 1.8 mW / cm 2 The stirring reaction time was 1.6 h. After the reaction was completed, the solvent was removed under reduced pressure and dried in a vacuum oven to obtain modified silicone oil;

[0048] S3. Add the modified silicone oil to toluene, stir thoroughly until uniform, and then add the modified allophane particles. The mass volume ratio of the modified silicone oil, modified allophane particles and toluene is 0.8 g:1.5 g:45 mL. After stirring thoroughly at room temperature, place the mixture in a water bath and heat it to 75°C. Keep stirring for 10 hours. After the reaction is completed, remove the solvent by rotary evaporation, and then wash the particles three times with anhydrous ethanol by centrifugation. After washing, collect the precipitate by centrifugation and vacuum dry it to obtain modified allophane particles.

[0049] The method for preparing the water-based ink for cigarette packaging paper comprises the following steps:

[0050] (1) placing the modified filler and pigment in a ball mill at a ball milling speed of 400 r / min for 3 h to obtain a first mixed material;

[0051] (2) mixing an aqueous acrylic emulsion, an aqueous polyurethane acrylate emulsion, and deionized water, stirring them thoroughly, then adding the first mixed material, and stirring them again to obtain a second mixed solution;

[0052] (3) Add the dispersant, defoaming agent, leveling agent and film-forming aid into the second mixed liquid in sequence, and stir thoroughly to obtain water-based ink for cigarette wrapping paper.

[0053] Example 2

[0054] A water-based ink for cigarette packaging paper, calculated in parts by weight, comprising:

[0055] 22 parts of water-based acrylic emulsion, 27 parts of water-based polyurethane acrylate emulsion, 8 parts of modified filler, 3 parts of pigment, 0.8 parts of dispersant, 0.4 parts of defoaming agent, 0.6 parts of leveling agent, 2 parts of film-forming aid and 15 parts of deionized water.

[0056] Among them, the brand of water-based acrylic emulsion is Hypomer AC-2518; the brand of water-based polyurethane acrylate emulsion is PUA-2922; the pigment is organic pigment phthalocyanine green; the dispersant is TEGO-745W; the defoamer is BYK-024; the leveling agent is BYK-300; and the film-forming agent is ethylene glycol butyl ether.

[0057] The preparation method of the modified filler includes:

[0058] S1. Adding allophane particles and (3-glycidyloxypropyl)trimethoxysilane to a 20 wt% ethanol solution, with a mass volume ratio of allophane particles, (3-glycidyloxypropyl)trimethoxysilane and ethanol solution of 1 g:0.35 g:20 mL, and mixing them uniformly at room temperature, and then refluxing and stirring in a 55° C. water bath for 10 h. After the treatment is completed, filtering out the liquid, and then washing the particles three times with anhydrous ethanol by centrifugation. After washing, the precipitate is centrifuged and dried to obtain glycidyl-modified allophane particles;

[0059] S2. Add 3-aminothiophenol and vinyl-terminated dimethylpolysiloxane (molecular weight 1500, vinyl content 2 mol%) to toluene in a mass volume ratio of 0.13 g:1.2 g:35 mL of 3-aminothiophenol:vinyl-terminated dimethylpolysiloxane:toluene. After stirring until uniform, add benzoin dimethyl ether in an amount of 3% of the mass of the modified silicone oil. Stir and react under ultraviolet light irradiation at an intensity of 1.3 mW / cm 2 The stirring reaction time is 0.6h. After the reaction is completed, the solvent is removed under reduced pressure and dried in a vacuum box to obtain modified silicone oil;

[0060] S3. Add the modified silicone oil to toluene, stir thoroughly until uniform, and then add the modified allophane particles. The mass volume ratio of the modified silicone oil, modified allophane particles and toluene is 0.6 g:1.2 g:35 mL. After stirring thoroughly at room temperature, place the mixture in a water bath and heat it to 65°C. Keep stirring for 5 hours. After the reaction is completed, remove the solvent by rotary evaporation. Then, wash the particles three times with anhydrous ethanol by centrifugation. After washing, collect the precipitate by centrifugation and vacuum dry it to obtain modified allophane particles.

[0061] The method for preparing the water-based ink for cigarette packaging paper comprises the following steps:

[0062] (1) placing the modified filler and pigment in a ball mill at a ball milling speed of 250 r / min for 4 h to obtain a first mixed material;

[0063] (2) mixing an aqueous acrylic emulsion, an aqueous polyurethane acrylate emulsion, and deionized water, stirring them thoroughly, then adding the first mixed material, and stirring them again to obtain a second mixed solution;

[0064] (3) Add the dispersant, defoaming agent, leveling agent and film-forming aid into the second mixed liquid in sequence, and stir thoroughly to obtain water-based ink for cigarette wrapping paper.

[0065] Example 3

[0066] A water-based ink for cigarette packaging paper, calculated in parts by weight, comprising:

[0067] 46 parts of water-based acrylic emulsion, 15 parts of water-based polyurethane acrylate emulsion, 16 parts of modified filler, 8 parts of pigment, 1.3 parts of dispersant, 0.8 parts of defoamer, 1.3 parts of leveling agent, 6 parts of film-forming aid and 30 parts of deionized water.

[0068] Among them, the brand of water-based acrylic emulsion is Hypomer AC-7450; the brand of water-based polyurethane acrylate emulsion is PUA-2922; the pigment is organic pigment phthalocyanine blue; the dispersant is TEGO-760W; the defoamer is BYK-022; the leveling agent is BYK-345; and the film-forming aid is propylene glycol ethyl ether.

[0069] The preparation method of the modified filler includes:

[0070] S1. Adding allophane particles and (3-glycidyloxypropyl)trimethoxysilane to an ethanol solution, the mass volume ratio of allophane particles, (3-glycidyloxypropyl)trimethoxysilane and 80wt% ethanol solution is 1g:0.55g:40mL, mixing them evenly at room temperature, and then refluxing and stirring in a 75°C water bath for 15h. After the treatment is completed, the liquid is filtered off, and the particles are then washed three times with anhydrous ethanol by centrifugation. After washing, the precipitate is centrifuged and dried to obtain glycidyl-modified allophane particles;

[0071] S2. Add 3-aminothiophenol and vinyl-terminated dimethylpolysiloxane (molecular weight 2500, vinyl content 6 mol%) to toluene in a mass volume ratio of 0.26 g:1.8 g:55 mL of 3-aminothiophenol:vinyl-terminated dimethylpolysiloxane to toluene. After stirring until uniform, add benzoin diethyl ether in an amount of 8% of the mass of the modified silicone oil. Stir and react under ultraviolet light irradiation at an intensity of 2.5 mW / cm 2 The stirring reaction time is 2.4h. After the reaction is completed, the solvent is removed under reduced pressure and dried in a vacuum box to obtain modified silicone oil;

[0072] S3. Add the modified silicone oil to toluene, stir thoroughly until uniform, and then add the modified allophane particles. The mass volume ratio of the modified silicone oil, modified allophane particles and toluene is 1.2g:1.8g:55mL. After stirring thoroughly at room temperature, place the mixture in a water bath and heat it to 85°C. Keep stirring for 15 hours. After the reaction is completed, remove the solvent by rotary evaporation. Then, wash the particles three times with anhydrous ethanol by centrifugation. After washing, collect the precipitate by centrifugation and vacuum dry it to obtain modified allophane particles.

[0073] The method for preparing the water-based ink for cigarette packaging paper comprises the following steps:

[0074] (1) placing the modified filler and pigment in a ball mill at a ball milling speed of 550 r / min for 2 h to obtain a first mixed material;

[0075] (2) mixing an aqueous acrylic emulsion, an aqueous polyurethane acrylate emulsion, and deionized water, stirring them thoroughly, then adding the first mixed material, and stirring them again to obtain a second mixed solution;

[0076] (3) Add the dispersant, defoaming agent, leveling agent and film-forming aid into the second mixed liquid in sequence, and stir thoroughly to obtain water-based ink for cigarette wrapping paper.

[0077] Comparative Example 1

[0078] A water-based ink, which differs from Example 1 in that the modified filler is replaced by allophane particles, and other components and preparation process remain unchanged.

[0079] Comparative Example 2

[0080] A water-based ink is provided, which differs from Example 1 in that the modified filler is replaced by glycidyl-modified allophane particles, and other components and preparation process remain unchanged.

[0081] Comparative Example 3

[0082] A water-based ink, which differs from Example 1 in that the modified filler is replaced by a mixture of glycidyl-modified allophane particles and vinyl-terminated dimethylpolysiloxane, the mass ratio of the glycidyl-modified allophane particles to the vinyl-terminated dimethylpolysiloxane is 1.5:0.8, and the other components and preparation process remain unchanged.

[0083] Experimental testing

[0084] The water-based ink prepared in Example 1 and Comparative Examples 1-3 was added to a printing device and coated on the surface of a substrate with a coating thickness of 30 μm. The substrate was then placed in a hot air drying process at 65° C. for 10 minutes. The properties of the dried water-based ink were tested accordingly.

[0085] The reference standard for adhesion fastness (coated paper) is GB / T 13217.7-2009 "Test method for adhesion fastness of liquid inks"; the reference standard for glossiness (coated paper) is GB / T 13217.2-2009 "Test method for gloss of liquid inks"; the reference standard for tinting strength (coated paper) is GB / T13217.6-2008 "Test method for tinting strength of liquid inks"; the reference standard for light fastness grade is ISO12040-1997, which is divided into grades 1-8, with grade 1 being the worst and grade 8 being the best.

[0086] The test results are shown in Table 1 below:

[0087] Table 1 Performance of different water-based inks

[0088]

[0089]

[0090] As shown in Table 1, compared to the other comparative examples, the water-based ink prepared in Example 1 of the present invention not only exhibits superior gloss and tinting strength, but also achieves an adhesion strength of 99.1%. In particular, its lightfastness rating is significantly higher than that of the other comparative examples. In summary, the water-based ink prepared in Example 1 of the present invention exhibits the most superior overall performance, with stronger color and texture, and is resistant to fading, making it suitable for use on high-end cigarette wrapping paper.

[0091] 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.

[0092] 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 water-based ink for cigarette packaging paper, characterized in that: Calculated in parts by weight, including: 22-46 parts of aqueous acrylic emulsion, 15-27 parts of aqueous polyurethane acrylate emulsion, 8-16 parts of modified filler, 1-10 parts of pigment, 0.2-2 parts of dispersant, 0.1-1 parts of defoamer, 0.5-1.5 parts of leveling agent, 2-6 parts of film-forming aid and 15-30 parts of deionized water; The modified filler is prepared by combining glycidyl-modified allophane particles with modified silicone oil, wherein the modified silicone oil is prepared by reacting 3-aminothiophenol and vinyl-terminated dimethylpolysiloxane; The preparation method of the modified filler comprises: S1. Adding allophane particles and (3-glycidyloxypropyl)trimethoxysilane to an ethanol solution, mixing them evenly, and then stirring under reflux, followed by filtering, washing, centrifuging, and drying to obtain glycidyl-modified allophane particles; S2, adding 3-aminothiophenol and vinyl-terminated dimethylpolysiloxane to toluene, stirring thoroughly until uniform, adding a photosensitizer, stirring and reacting under ultraviolet light irradiation, and after the reaction is completed, removing the solvent under reduced pressure and drying to obtain a modified silicone oil; S3, adding modified silicone oil and modified allophane particles to toluene, stirring thoroughly, heating in a water bath to 65-85° C., keeping warm and stirring for 5-15 hours, and after the reaction is completed, rotary evaporation, washing, centrifugation and drying to obtain modified allophane particles; In S1, the mass volume ratio of allophane particles, 3-glycidyloxypropyl)trimethoxysilane and ethanol solution is 1g: (0.35-0.55)g: (20-40)mL; the mass fraction of the ethanol solution is 20%-80%; In the S2, the molecular weight of the vinyl-terminated dimethyl polysiloxane is 1500-2500, and the vinyl molar content is 2%-6%; In S2, the mass volume ratio of 3-aminothiophenol, vinyl-terminated dimethylpolysiloxane and toluene is (0.13-0.26) g: (1.2-1.8) g: (35-55) mL; In the S3, the mass volume ratio of the modified silicone oil, the modified allophane particles and toluene is (0.6-1.2) g: (1.2-1.8) g: (35-55) mL.

2. The water-based ink for cigarette packaging paper according to claim 1, characterized in that: The brand of the water-based acrylic emulsion is Hypomer AC-2518 or Hypomer AC-7450; the brand of the water-based polyurethane acrylate emulsion is PUA-2922.

3. The water-based 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 water-based ink for cigarette packaging paper according to claim 1, characterized in that: The dispersant is at least one of TEGO-752W, TEGO-760W, and TEGO-745W; the defoamer is at least one of BYK-021, BYK-022, and BYK-024; the leveling agent is at least one of BYK-333, BYK-345, and BYK-300; and the film-forming aid is at least one of dodecyl alcohol ester, propylene glycol ethyl ether, ethylene glycol butyl ether, and propylene glycol butyl ether.

5. A method for preparing water-based ink for cigarette packaging paper according to claim 1, characterized in that: The following steps are involved: (1) Place the modified filler and pigment in a ball mill at a ball milling speed of 250-550 r / min for 2-4 h. After the ball milling is completed, a first mixed material is obtained; (2) Mixing the aqueous acrylic emulsion, aqueous polyurethane acrylate emulsion and deionized water, stirring them thoroughly, then adding the first mixed material, stirring them again, to obtain a second mixed solution; (3) Add the dispersant, defoaming agent, leveling agent and film-forming aid into the second mixed liquid in sequence and stir thoroughly to obtain water-based ink for cigarette wrapping paper.

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