Water-based ink for cigarette packet paper and preparation method of water-based ink

Abstract

The invention relates to the field of ink, in particular to water-based ink for cigarette packet paper and a preparation method of the water-based ink. Comprising 22-46 parts of a water-based acrylic emulsion, 15-27 parts of a water-based 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 part of a defoaming agent, 0.5-1.5 parts of a leveling agent, 2-6 parts of a coalescing agent and 15-30 parts of deionized water. The modified filler is introduced into the water-based ink, so that the water-based ink not only has better glossiness and tinting strength than traditional filler, but also has better light fastness, the color of the ink is more beautiful, the texture performance is stronger, and the printing attractiveness is greatly enhanced.

Description

Technical Field

[0001] The 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] At present, the cigarette packaging printing industry mostly uses alcohol-soluble gravure printing inks. This type of ink uses a large amount of alcohol and ester solvents. Although it can meet the requirements of cigarette label printing, it contains a large amount of organic solvents. In the actual operation process, the volatilization of organic solvents is inhaled by operators, which will cause physical discomfort and harm. At the same time, the emission of volatile solvents will pollute the surrounding environment. With the continuous improvement of people's living standards, environmental protection and greenness have become the general trend of today's printing and packaging industry. Compared with organic solvent-based inks, water-based inks with water as the solvent have the advantage of having extremely low VOC content, which can reduce the harm to ink users, and thus are becoming more and more widely used.

[0003] Water-based ink, also known as liquid ink, is mainly made of water-soluble resin, organic pigment, water and related additives through composite grinding. It is particularly suitable for packaging and printing products with strict hygiene requirements such as cigarettes, alcohol, food, toys, etc. However, in the prior art, compared with organic solvent-based inks, water-based inks have poor gloss, tinting strength and light fastness, resulting in the pattern printed on the cigarette paper not only being dull, but also fading seriously, and failing to meet the quality requirements of high-end cigarette paper. Therefore, it is necessary to develop a water-based ink with high gloss, high coloring and good light fastness suitable for high-end cigarette paper. Summary of the invention

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

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

[0006] In a first aspect, the present invention provides a water-based ink for cigarette packaging paper, which comprises, calculated 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 defoamer, 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 grade 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 dodecyl 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 refluxing and stirring them, 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 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 modified silicone oil;

[0019] S3. Add modified silicone oil and modified allophane particles into toluene, stir thoroughly, place in a water bath and heat to 65-85°C, keep warm and stir for 5-15h. After the reaction is completed, perform rotary evaporation, washing, centrifugation and drying 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 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 molar content of vinyl 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 intensity of the ultraviolet light 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 the 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 after the ball milling is completed;

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

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

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

[0034] 1. The present invention prepares a water-based ink suitable for cigarette packaging paper. The main material of the water-based ink adopts a mixed emulsion of water-based acrylic acid and water-based polyurethane acrylate (WPUA), which can be firmly bonded to the cigarette packaging paper substrate and 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, so that the color of the ink is more beautiful and the texture is stronger, thereby greatly enhancing the aesthetics of printing.

[0035] 2. The modified filler prepared by the present invention is based on allophane particles. Although the particle size of allophane is small, a large number of fine pores are distributed on the surface, and the surface has a large specific surface area. The present invention first treats allophane with glycidyl silane to obtain glycidyl-modified allophane particles, and then combines them with modified silicone oil containing amino groups. The obtained modified allophane particles are the modified filler. After the modified filler prepared by this method is applied to water-based ink, it can be well combined with the pigment, and the brightening and tinting power of the pigment are greatly enhanced, and the weather resistance of the water-based ink is also significantly improved.

[0036] 3. The modified silicone oil used in the modified filler is prepared by 3-aminothiophenol and vinyl silicone oil (vinyl-terminated dimethyl polysiloxane) through a mercapto-vinyl click chemistry reaction. The modified silicone oil contains not only amino groups but also a large number of thioether groups, which are subsequently combined with glycidyl-modified allophane particles to obtain 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 existence 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 limit the scope of the present invention. The change or adjustment of the relative relationship thereof shall also be regarded as the scope of the present invention without substantially changing the technical content.

[0038] In order to better understand the above technical scheme, the 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 in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated 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 in conjunction with the following examples.

[0041] Example 1

[0042] A water-based ink for cigarette packaging paper, calculated 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 defoamer, 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 1000-1500cps, 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 1500-2000cps, a solid content of 36%-38%, and a pH of 7.5-8.5; the pigment is an 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 dodecanol ester.

[0045] Wherein, the preparation method of the modified filler comprises:

[0046] S1. Add allophane particles and (3-glycidyloxypropyl)trimethoxysilane to a 60wt% ethanol solution, wherein the mass volume ratio of allophane particles, (3-glycidyloxypropyl)trimethoxysilane and ethanol solution is 1g:0.45g:30mL, mix well at room temperature, and then reflux and stir in a water bath at 65°C for 12h. After the treatment, filter out the liquid, and then wash the particles three times with anhydrous ethanol by centrifugation. After washing, centrifuge to obtain the precipitate, and dry it to obtain glycidyl-modified allophane particles.

[0047] S2. Add 3-aminothiophenol and vinyl-terminated dimethylpolysiloxane (molecular weight 2000, vinyl content 4 mol%) into toluene, the mass volume ratio of 3-aminothiophenol, vinyl-terminated dimethylpolysiloxane and toluene is 0.21 g:1.5 g:45 mL. After fully 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, and the ultraviolet light intensity is 1.8 mW / cm 2 The stirring reaction time is 1.6h. After the reaction is completed, the solvent is 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, the modified allophane particles and toluene is 0.8g:1.5g:45mL. At room temperature, stir thoroughly, place in a water bath and heat 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 by centrifugation with anhydrous ethanol. After washing, collect the precipitate by centrifugation and vacuum dry 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 the 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, adding the first mixed material, and stirring them again to obtain a second mixed solution;

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

[0053] Example 2

[0054] A water-based ink for cigarette packaging paper, calculated 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 defoamer, 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 aid is ethylene glycol butyl ether.

[0057] Wherein, the preparation method of the modified filler comprises:

[0058] S1. Add allophane particles and (3-glycidyloxypropyl)trimethoxysilane to a 20wt% ethanol solution, wherein the mass volume ratio of allophane particles, (3-glycidyloxypropyl)trimethoxysilane and ethanol solution is 1g:0.35g:20mL, mix well at room temperature, and then reflux and stir in a water bath at 55°C for 10h. After the treatment, filter out the liquid, and then wash the particles three times with anhydrous ethanol by centrifugation. After washing, centrifuge to obtain the precipitate, and dry it to obtain glycidyl-modified allophane particles.

[0059] S2. Add 3-aminothiophenol and vinyl-terminated dimethylpolysiloxane (molecular weight 1500, vinyl content 2 mol%) into toluene, the mass volume ratio of 3-aminothiophenol, vinyl-terminated dimethylpolysiloxane and toluene is 0.13 g:1.2 g:35 mL. After fully 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, the ultraviolet light intensity is 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 oven 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, the modified allophane particles and toluene is 0.6g:1.2g:35mL. After stirring thoroughly at room temperature, place in a water bath and heat to 65°C. Keep stirring for 5 hours. After the reaction is completed, remove the solvent by rotary evaporation, and then wash the particles three times by centrifugation with anhydrous ethanol. After washing, collect the precipitate by centrifugation and vacuum dry 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 the 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, adding the first mixed material, and stirring them again to obtain a second mixed solution;

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

[0065] Example 3

[0066] A water-based ink for cigarette packaging paper, calculated 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] Wherein, the preparation method of the modified filler comprises:

[0070] S1. Add allophane particles and (3-glycidyloxypropyl)trimethoxysilane to an ethanol solution, wherein the mass volume ratio of allophane particles, (3-glycidyloxypropyl)trimethoxysilane and 80wt% ethanol solution is 1g:0.55g:40mL, mix well at room temperature, and then reflux and stir in a water bath at 75°C for 15h. After the treatment, filter out the liquid, and then wash the particles three times with anhydrous ethanol by centrifugation. After washing, centrifuge to obtain the precipitate, and dry it to obtain glycidyl-modified allophane particles.

[0071] S2. Add 3-aminothiophenol and vinyl-terminated dimethylpolysiloxane (molecular weight 2500, vinyl content 6 mol%) into toluene, the mass volume ratio of 3-aminothiophenol, vinyl-terminated dimethylpolysiloxane and toluene is 0.26 g:1.8 g:55 mL. After fully 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, the ultraviolet light intensity is 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 oven to obtain modified silicone oil;

[0072] S3. Add modified silicone oil to toluene, stir thoroughly until uniform, then add modified allophane particles, the mass volume ratio of modified silicone oil, modified allophane particles and toluene is 1.2g:1.8g:55mL, stir thoroughly at room temperature, place in a water bath and heat to 85°C, keep stirring for 15 hours, after the reaction is completed, remove the solvent by rotary evaporation, and then use anhydrous ethanol to wash the particles three times by centrifugation, collect the precipitate by centrifugation after washing, and vacuum dry 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 the 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, adding the first mixed material, and stirring them again to obtain a second mixed solution;

[0076] (3) Add the dispersant, defoamer, leveling agent and film-forming aid into the second mixed liquid in sequence and stir thoroughly to obtain water-based ink for cigarette packaging 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, 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 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 into the printing equipment, coated on the surface of the substrate with a coating thickness of 30 μm, and then placed in a hot air drying treatment at a temperature of 65° C. for 10 minutes; the performance of the dried water-based ink was tested accordingly.

[0085] The reference standard for adhesion fastness (coated paper) is GB / T 13217.7-2009 "Test method for adhesion fastness of liquid ink"; the reference standard for gloss (coated paper) is GB / T 13217.2-2009 "Test method for gloss of liquid ink"; the reference standard for tinting strength (coated paper) is GB / T13217.6-2008 "Test method for tinting strength of liquid ink"; 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] It can be seen from Table 1 that, compared with other comparative examples, the water-based ink prepared in Example 1 of the present invention not only has better gloss and tinting power, but also has an adhesion fastness of 99.1%, and in particular, the light fastness level is much higher than other comparative examples. In summary, it can be shown that the comprehensive performance of the water-based ink prepared in Example 1 of the present invention is the most excellent, the color and texture are stronger, and it will not fade easily, and is suitable for use on high-end cigarette packaging paper.

[0091] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means 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 representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may 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 is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A water-based ink for cigarette packaging paper, characterized in that: Calculated by weight, including: 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 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.

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; 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. The water-based ink for cigarette packaging paper according to claim 1, characterized in that: 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 refluxing and stirring them, followed by filtering, washing, centrifuging and drying to obtain glycidyl-modified allophane particles; S2, adding 3-aminothiophenol and vinyl-terminated dimethylpolysiloxane to toluene, stirring 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 modified silicone oil; S3. Add modified silicone oil and modified allophane particles into toluene, stir thoroughly, place in a water bath and heat to 65-85°C, keep warm and stir for 5-15h. After the reaction is completed, perform rotary evaporation, washing, centrifugation and drying to obtain modified allophane particles.

6. The water-based ink for cigarette packaging paper according to claim 5, characterized in that: In the 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; and the mass fraction of the ethanol solution is 20%-80%.

7. The water-based ink for cigarette packaging paper according to claim 5, characterized in that: In the S2, the molecular weight of the vinyl-terminated dimethyl polysiloxane is 1500-2500, and the molar content of vinyl groups is 2%-6%.

8. The water-based ink for cigarette packaging paper according to claim 5, characterized in that: 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.

9. The water-based ink for cigarette packaging paper according to claim 5, characterized in that: 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.

10. A method for preparing water-based ink for cigarette packaging paper according to claim 1, characterized in that: The following steps are involved: (1) placing the modified filler and the 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 after the ball milling is completed; (2) mixing an aqueous acrylic emulsion, an aqueous polyurethane acrylate emulsion and deionized water, stirring them thoroughly, adding the first mixed material, and stirring them again to obtain a second mixed solution; (3) Add the dispersant, defoamer, leveling agent and film-forming aid into the second mixed liquid in sequence and stir thoroughly to obtain water-based ink for cigarette packaging paper.

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