UV printing ink for cigarette packaging paper and printing process of UV printing ink

Abstract

The invention relates to the field of ink, in particular to UV ink for cigarette packaging paper and a printing process thereof, the UV ink comprises the following components in parts by weight: 50-70 parts of urethane acrylate, 12-24 parts of bisphenol A epoxy acrylate, 15-30 parts of bifunctional acrylate, 4-18 parts of a filling modifier, 0.1-10 parts of pigment, 0.1-1 part of a dispersing agent, 0.1-1 part of a defoaming agent and 2.7-5.4 parts of a photoinitiator; the UV resin adopted by the invention is a mixture of polyurethane acrylate, bisphenol A epoxy acrylate and bifunctional acrylate, the filler is the filling modifier prepared from allophane nanotubes, and meanwhile, part of the pigment and the auxiliary agent are added, so that the prepared UV ink is high in glossiness, good in water resistance, good in water resistance, good in water resistance, good in water resistance and good in water resistance, and the service life of the UV ink is prolonged. And in addition, excellent wear resistance and corrosion resistance are achieved.

Description

Technical Field

[0001] The invention relates to the field of inks, and in particular to UV ink for cigarette packaging paper and a printing process thereof. Background Art

[0002] Wrapping paper is the most widely used packaging material at present, and is generally made of paper. With the continuous development of the cigarette industry in recent years, the amount of wrapping paper used has increased. In order to clearly indicate product information, fonts, patterns, etc. are usually printed on the wrapping paper to intuitively display the information of the product contained in the wrapping paper. As a substance used to form graphic information, ink plays a very important role in the printing industry, and can directly determine whether the color and clarity of the image on the wrapping paper have a good effect. The components of ink are generally colorants, binders, fillers, etc., among which colorants give printed products a variety of tones, binders can make the colorants adhere to the surface of the substrate, and fillers can give the ink appropriate properties so that the ink meets the printability of various printing processes.

[0003] UV ink is an environmentally friendly ink that has developed rapidly in recent years. It has quickly occupied the market with its instant curing, no volatile solvents, and simple and convenient application. UV ink includes special packaging inks such as UV frosting, UV ice flower, UV foaming, UV wrinkle, UV embossing, UV refraction, UV gem, UV light-fixing ink, and UV varnish. On the surface of the substrate with a metallic mirror luster, the UV ink is printed on it by screen printing. After being treated with ultraviolet drying equipment, a unique visual effect is produced, which looks elegant, solemn and luxurious. The product is mainly used for high-end, exquisite and unique packaging printing of cigarettes, wine, cosmetics, health products, food, and medicines. Although UV ink performs well in glossiness, its water resistance is relatively poor. In a humid environment, the printed product may change color or fade; and the film layer formed after the UV ink is cured has deficiencies in certain physical properties, such as scratch resistance and chemical resistance. These deficiencies in performance limit the application of UV ink in the field of cigarette packaging 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 a UV ink for cigarette packaging paper and a printing process 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 UV ink for cigarette packaging paper, which comprises, calculated by weight:

[0007] 50-70 parts of polyurethane acrylate, 12-24 parts of bisphenol A epoxy acrylate, 15-30 parts of difunctional acrylate, 4-18 parts of filler modifier, 0.1-10 parts of pigment, 0.1-1 parts of dispersant, 0.1-1 parts of defoamer and 2.7-5.4 parts of photoinitiator.

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

[0009] Preferably, the brand of the bisphenol A epoxy acrylate (EA) is one of Covestro Agisyn 1010-A80, Covestro Agisyn 1030, and Covestro Agisyn 1050.

[0010] Preferably, the bifunctional acrylate is a mixture of diethylene glycol diacrylate, triethylene glycol diacrylate and 1,6-hexanediol diacrylate, and the mass ratio of diethylene glycol diacrylate, triethylene glycol diacrylate and 1,6-hexanediol diacrylate is 1-5:2-6:1-5.

[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-655, TEGO-688, TEGO-685, and TEGO-755W.

[0013] Preferably, the defoaming agent is at least one of BYK-085, BYK-1794, BYK-012 and BYK-024.

[0014] Preferably, the photoinitiator is at least one of photoinitiator TPO-L (ethyl 2,4,6-trimethylbenzoylphenylphosphonate), photoinitiator 1173 (2-hydroxy-2-methyl-1-phenyl-1-propanone), and photoinitiator 184 (hydroxycyclohexane phenone).

[0015] Preferably, the preparation method of the filling modifier comprises:

[0016] S1, mixing hydrous allophane nanotubes with anhydrous ethanol, adding 3-aminopropyltriethoxysilane, and then reflux at 50-70°C for 3-10 hours. After the treatment is completed, centrifuge to collect the precipitate, and then rinse the precipitate with anhydrous ethanol three times, and place it in a vacuum box to dry, so as to obtain amination hydrous allophane nanotubes;

[0017] S2, adding 3-mercaptobenzoic acid to N,N-dimethylformamide, stirring thoroughly until dissolved, then adding condensing agent EDCl (1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride), stirring at room temperature for 0.5-1.5h, then adding activator DMAP (4-dimethylaminopyridine), stirring again for 0.5-1.5h, then adding amination of allophane nanotubes, first stirring and dispersing evenly, then stirring at room temperature for 20-30h, after the reaction is completed, removing the solvent under reduced pressure, collecting the solid and rinsing it with anhydrous ethanol three times, and then drying it in a vacuum oven to obtain modified allophane nanotubes;

[0018] S3. Dissolve allyl phenyl ether in N,N-dimethylformamide, then add modified allophane nanotubes, and after uniform dispersion, introduce nitrogen as protective gas, add photoinitiator, and stir the reaction under ultraviolet light for 1-2 hours. After the reaction is completed, reduce the pressure to remove the solvent, collect the solid, rinse it three times with anhydrous ethanol, and vacuum dry it to obtain a filling modifier.

[0019] Preferably, in S1, 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.

[0020] Preferably, 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.

[0021] Preferably, in S2, the mass volume ratio of the amination-hydrated allophane nanotubes, 3-mercaptobenzoic acid, condensation agent EDCl, activator DMAP and N,N-dimethylformamide is 1 g:(0.31-0.62) g:(0.4-0.8) g:(0.24-0.48) g:(10-20) mL.

[0022] Preferably, in S3, the mass volume ratio of the modified allophane nanotubes, allyl phenyl ether and N,N-dimethylformamide is 1 g: (0.26-0.52) g: (30-50) mL.

[0023] Preferably, in S3, the irradiation intensity of the ultraviolet light is 1.2-2.4 mw / cm 2 , the wavelength is 280-400nm.

[0024] Preferably, in S3, the photoinitiator is benzoin dimethyl ether or benzoin diethyl ether, and the usage amount is 2%-10% of the mass of the modified allophane nanotubes.

[0025] In a second aspect, the present invention provides a method for preparing UV ink for cigarette packaging paper, comprising the following steps:

[0026] Step 1, firstly mix polyurethane acrylate, bisphenol A epoxy acrylate and difunctional acrylate, and stir them thoroughly to obtain a mixed resin;

[0027] Step 2, adding a filler modifier, a pigment, a dispersant and a defoamer into the mixed resin, and then placing it on a three-roll mill for grinding, passing through a 100-300 mesh sieve, to obtain a mixed liquid;

[0028] Step 3, adding a photoinitiator into the mixed liquid, stirring it thoroughly to obtain UV ink for cigarette packaging paper.

[0029] The beneficial effects of the present invention are:

[0030] 1. The present invention prepares a UV ink suitable for cigarette packaging paper. The UV resin used is a mixture of polyurethane acrylate, bisphenol A epoxy acrylate, and difunctional acrylate. The filler is a filling modifier prepared using allophane nanotubes. At the same time, some pigments and additives are added. The prepared UV ink not only has high gloss and good water resistance, but also has excellent wear resistance and corrosion resistance.

[0031] 2. The modification point of the present invention to the existing UV ink is that a variety of acrylates are used as UV resins, combining the advantages of a variety of raw materials to enhance the strength, toughness and adhesion performance of the UV ink.

[0032] 3. The modification point of the present invention for the existing UV ink is that the filler used is a modified material of allophane nanotubes. Allophane nanotubes have a large specific surface area, good adsorption and surface activity. The present invention uses this property to firstly perform aminosilanization treatment on the surface of allophane nanotubes, then use 3-mercaptobenzoic acid containing carboxyl to carry out amino-carboxyl catalytic condensation reaction with it, and finally use allyl phenyl ether containing double bonds to carry out mercapto-double bond click chemistry reaction with it, and the final modified material obtained is the filling modifier.

[0033] 3. In the modification of allophane nanotubes in the present invention, groups such as phenyl ether, amide and thioether are generated or introduced, so that when it is used as a filler for ink, it has a great influence on various properties of the ink. Subsequent tests have found that the improvement in the wear resistance and corrosion resistance of the ink is the most obvious, and the water resistance is also improved to a certain extent. DETAILED DESCRIPTION

[0034] 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.

[0035] The particle size of the allophane nanotubes 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.

[0036] The present invention will be further described below in conjunction with the following examples.

[0037] Example 1

[0038] A UV ink for cigarette packaging paper, calculated by weight, comprising:

[0039] 60 parts of polyurethane acrylate, 18 parts of bisphenol A epoxy acrylate, 24 parts of difunctional acrylate, 11 parts of filler modifier, 2.3 parts of pigment, 0.6 parts of dispersant, 0.5 parts of defoamer and 3.9 parts of photoinitiator.

[0040] Among them, the brand of polyurethane acrylate (PUA) is UV-1230; the brand of bisphenol A epoxy acrylate (EA) is Covestro Agisyn1010-A80; and the difunctional acrylate is a mixture of diethylene glycol diacrylate, triethylene glycol diacrylate, and 1,6-hexanediol diacrylate in a mass ratio of 3:4:2.

[0041] Among them, the pigment is organic pigment phthalocyanine red; the dispersant is TEGO-655; the defoamer is BYK-085; and the photoinitiator is photoinitiator TPO-L (ethyl 2,4,6-trimethylbenzoylphenylphosphonate).

[0042] The preparation method of the filling modifier comprises:

[0043] S1. Take 1 g of allophane nanotubes and mix them with 25 mL of anhydrous ethanol, add 0.4 g of 3-aminopropyltriethoxysilane, and then reflux at 60° C. for 7 h. After the treatment, collect the precipitate by centrifugation in a centrifuge, then rinse the precipitate with anhydrous ethanol three times, and place it in a vacuum box to dry, thereby obtaining the amination allophane nanotubes;

[0044] S2, add 0.47g 3-mercaptobenzoic acid to 15mL N, N-dimethylformamide, stir thoroughly until dissolved, then add 0.6g condensing agent EDCl (1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride), stir at room temperature for 1h, then add 0.36g activator DMAP (4-dimethylaminopyridine), stir again for 1h, then add 1g amination of allophane nanotubes, first stir and disperse evenly, then stir at room temperature for 24h, after the reaction is completed, remove the solvent under reduced pressure, collect the solid and rinse it three times with anhydrous ethanol, then place it in a vacuum oven to dry, to obtain modified allophane nanotubes;

[0045] S3, 0.38g of allyl phenyl ether was dissolved in 40mL of N,N-dimethylformamide, and then 1g of modified allophane nanotubes was added. After uniform dispersion, nitrogen was introduced as a protective gas, and 6% of benzoin dimethyl ether by weight of the modified allophane nanotubes was added. The mixture was stirred and reacted under ultraviolet light. The ultraviolet light intensity was 1.8mw / cm 2 , the wavelength is 365nm, the reaction time is 1.5h, and after the reaction is completed, the solvent is removed under reduced pressure, the solid is collected and rinsed three times with anhydrous ethanol, and vacuum dried to obtain a filling modifier.

[0046] The method for preparing the UV ink for cigarette packaging paper comprises the following steps:

[0047] Step 1, firstly mix polyurethane acrylate, bisphenol A epoxy acrylate and difunctional acrylate, and stir them thoroughly to obtain a mixed resin;

[0048] Step 2, adding a filler modifier, a pigment, a dispersant and a defoamer into the mixed resin, and then placing it on a three-roll mill for grinding, passing through a 200-mesh sieve, to obtain a mixed liquid;

[0049] Step 3, adding a photoinitiator into the mixed liquid, stirring it thoroughly to obtain UV ink for cigarette packaging paper.

[0050] Example 2

[0051] A UV ink for cigarette packaging paper, calculated by weight, comprising:

[0052] 50 parts of polyurethane acrylate, 12 parts of bisphenol A epoxy acrylate, 15 parts of difunctional acrylate, 4 parts of filler modifier, 0.9 parts of pigment, 0.4 parts of dispersant, 0.3 parts of defoamer and 2.7 parts of photoinitiator.

[0053] Among them, the brand of polyurethane acrylate (PUA) is UV-1990; the brand of bisphenol A epoxy acrylate (EA) is Covestro Agisyn 1030; and the difunctional acrylate is a mixture of diethylene glycol diacrylate, triethylene glycol diacrylate, and 1,6-hexanediol diacrylate in a mass ratio of 1:2:1.

[0054] The pigment is an organic pigment, including phthalocyanine blue; the dispersant is TEGO-688; the defoamer is BYK-1794; and the photoinitiator is photoinitiator 1173 (2-hydroxy-2-methyl-1-phenyl-1-propanone).

[0055] The preparation method of the filling modifier comprises:

[0056] S1. Take 1 g of allophane nanotubes and 15 mL of anhydrous ethanol, mix them, add 0.3 g of 3-aminopropyltriethoxysilane, and then reflux at 50° C. for 3 h. After the treatment, collect the precipitate by centrifugation in a centrifuge, and then rinse the precipitate three times with anhydrous ethanol and place it in a vacuum box to dry, so as to obtain amination of allophane nanotubes; wherein the mass volume ratio of allophane nanotubes, 3-aminopropyltriethoxysilane and anhydrous ethanol is 1 g:0.3 g:15 mL;

[0057] S2, 0.31g 3-mercaptobenzoic acid was added to 10mL N, N-dimethylformamide, and the mixture was stirred until dissolved. Then, 0.4g condensing agent EDCl (1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride) was added, and the mixture was stirred at room temperature for 0.5h. Then, 0.24g activating agent DMAP (4-dimethylaminopyridine) was added, and the mixture was stirred again for 0.5h. Then, 1g amination-modified allophane nanotubes was added, and the mixture was stirred and dispersed uniformly, and then stirred at room temperature for 20h. After the reaction was completed, the solvent was removed under reduced pressure, and the solid was collected and rinsed three times with anhydrous ethanol, and then dried in a vacuum oven to obtain modified allophane nanotubes.

[0058] S3, 0.26g of allyl phenyl ether was dissolved in 30mL of N,N-dimethylformamide, and then 1g of modified allophane nanotubes was added. After uniform dispersion, nitrogen was introduced as a protective gas, and 2% of benzoin diethyl ether by weight of the modified allophane nanotubes was added. The mixture was stirred and reacted under ultraviolet light, and the ultraviolet light irradiation intensity was 1.2mw / cm 2 , the wavelength is 365nm, the reaction time is 1-2h, and after the reaction is completed, the solvent is removed under reduced pressure, the solid is collected and rinsed three times with anhydrous ethanol, and vacuum dried to obtain a filling modifier.

[0059] The method for preparing the UV ink for cigarette packaging paper comprises the following steps:

[0060] Step 1, firstly mix polyurethane acrylate, bisphenol A epoxy acrylate and difunctional acrylate, and stir them thoroughly to obtain a mixed resin;

[0061] Step 2, adding a filler modifier, a pigment, a dispersant and a defoamer into the mixed resin, and then placing it on a three-roll mill for grinding, passing through a 100-mesh sieve, to obtain a mixed liquid;

[0062] Step 3, adding a photoinitiator into the mixed liquid, stirring it thoroughly to obtain UV ink for cigarette packaging paper.

[0063] Example 3

[0064] A UV ink for cigarette packaging paper, calculated by weight, comprising:

[0065] 70 parts of polyurethane acrylate, 24 parts of bisphenol A epoxy acrylate, 30 parts of difunctional acrylate, 18 parts of filler modifier, 5.4 parts of pigment, 0.8 parts of dispersant, 0.7 parts of defoamer and 5.4 parts of photoinitiator.

[0066] Among them, the brand of polyurethane acrylate (PUA) is UV-1205; the brand of bisphenol A epoxy acrylate (EA) is Covestro Agisyn 1050; and the difunctional acrylate is a mixture of diethylene glycol diacrylate, triethylene glycol diacrylate, and 1,6-hexanediol diacrylate in a mass ratio of 5:6:5.

[0067] Among them, the pigment is an organic pigment, including permanent yellow; the dispersant is TEGO-755W; the defoamer is BYK-024; and the photoinitiator is photoinitiator 184 (hydroxycyclohexane phenone).

[0068] The preparation method of the filling modifier comprises:

[0069] S1. Mix allophane nanotubes and anhydrous ethanol, add 3-aminopropyltriethoxysilane, the mass volume ratio of allophane nanotubes, 3-aminopropyltriethoxysilane and anhydrous ethanol is 1g:0.6g:35mL, and then reflux at 70°C for 10h. After the treatment is completed, centrifuge in a centrifuge to collect the precipitate, and then rinse the precipitate with anhydrous ethanol three times, and place it in a vacuum box to dry, so as to obtain aminated allophane nanotubes;

[0070] S2, add 0.62g 3-mercaptobenzoic acid to 20mL N,N-dimethylformamide, stir thoroughly until dissolved, then add 0.8g condensing agent EDCl (1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride), stir at room temperature for 1.5h, then add 0.48g activator DMAP (4-dimethylaminopyridine), stir again for 1.5h, then add 1g amination of allophane nanotubes, first stir and disperse evenly, then stir at room temperature for 30h, after the reaction is completed, remove the solvent under reduced pressure, collect the solid and rinse it three times with anhydrous ethanol, then place it in a vacuum oven to dry, to obtain modified allophane nanotubes;

[0071] S3, 0.52g of allyl phenyl ether was dissolved in 50mL of N,N-dimethylformamide, and then 1g of modified allophane nanotubes was added. After uniform dispersion, nitrogen was introduced as a protective gas, and 10% of the mass of modified allophane nanotubes of benzoin dimethyl ether or benzoin diethyl ether was added. The mixture was stirred and reacted under ultraviolet light. The ultraviolet light intensity was 2.4mw / cm 2 , the wavelength is 365nm, the reaction time is 2h, and after the reaction is completed, the solvent is removed under reduced pressure, the solid is collected and rinsed three times with anhydrous ethanol, and vacuum dried to obtain a filling modifier.

[0072] The method for preparing the UV ink for cigarette packaging paper comprises the following steps:

[0073] Step 1, firstly mix polyurethane acrylate, bisphenol A epoxy acrylate and difunctional acrylate, and stir them thoroughly to obtain a mixed resin;

[0074] Step 2, adding a filler modifier, a pigment, a dispersant and a defoamer into the mixed resin, and then placing it on a three-roll mill for grinding, and passing it through a 300-mesh sieve to obtain a mixed liquid;

[0075] Step 3, adding a photoinitiator into the mixed liquid, stirring it thoroughly to obtain UV ink for cigarette packaging paper.

[0076] Comparative Example 1

[0077] A UV ink for cigarette packaging paper, which differs from Example 1 in that the filler modifier in Example 1 is replaced by ordinary allophane nanotubes, and other components and preparation methods remain unchanged.

[0078] Comparative Example 2

[0079] A UV ink for cigarette packaging paper, which differs from Example 1 in that the filler modifier in Example 1 is replaced by amination of allophane nanotubes (the same as Example 1), and other components and preparation methods remain unchanged.

[0080] Comparative Example 3

[0081] A UV ink for cigarette packaging paper, which differs from Example 1 in that the filler modifier in Example 1 is replaced by modified allophane nanotubes (the same as Example 1), and other components and preparation methods remain unchanged.

[0082] Experimental testing

[0083] The UV ink prepared in Example 1 and Comparative Examples 1-3 was coated on the surface of the substrate by flexographic printing, and then placed under 1000 mW / cm 2 The ink was treated under ultraviolet light at a temperature of 45°C and a treatment time of 6s. The performance of the cured UV ink was tested accordingly. The test items include: adhesion, surface hardness, water resistance and corrosion resistance. The reference standard for adhesion testing is GB / T 9286-1998; the reference standard for surface hardness testing is GB / T 6739-2006; the reference standard for water resistance testing is GB / T 1733-1993; the acid resistance is to soak in a 5wt% hydrochloric acid solution for 24 hours, take out and dry to observe whether the ink is damaged (including fading, shedding or cracking), the severity level: a large amount > a small amount > a slight amount > no abnormality; the alkali resistance is to soak in a 1wt% sodium hydroxide solution for 24 hours, take out and dry to observe whether the ink is damaged (including fading, shedding or cracking), the severity level: a large amount > a small amount > a slight amount > no abnormality; the test results are shown in Table 1:

[0084] Table 1 Ink testing results

[0085]

[0086] It can be seen from Table 1 above that the UV ink of Example 1 has better overall performance, especially in terms of surface hardness, water resistance, acid and alkali resistance, etc., and also has excellent adhesion performance. In summary, it can be shown that the UV ink of Example 1 of the present invention is more suitable for application in the field of cigarette packaging paper.

[0087] 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.

[0088] 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 UV ink for cigarette packaging paper, characterized in that: Calculated by weight, including: 50-70 parts of polyurethane acrylate, 12-24 parts of bisphenol A epoxy acrylate, 15-30 parts of difunctional acrylate, 4-18 parts of filler modifier, 0.1-10 parts of pigment, 0.1-1 parts of dispersant, 0.1-1 parts of defoamer and 2.7-5.4 parts of photoinitiator; The bifunctional acrylate is a mixture of diethylene glycol diacrylate, triethylene glycol diacrylate and 1,6-hexanediol diacrylate, and the mass ratio of diethylene glycol diacrylate, triethylene glycol diacrylate and 1,6-hexanediol diacrylate is 1-5:2-6:1-5.

2. The UV ink for cigarette packaging paper according to claim 1, characterized in that: The polyurethane acrylate is one of UV-1230, UV-1990, and UV-1205; the bisphenol A epoxy acrylate is one of Covestro Agisyn1010-A80, Covestro Agisyn 1030, and Covestro Agisyn 1050.

3. The UV 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 UV 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; the defoamer is at least one of BYK-085, BYK-1794, BYK-012, and BYK-024; and the photoinitiator is at least one of photoinitiator TPO-L, photoinitiator 1173, and photoinitiator 184.

5. The UV ink for cigarette packaging paper according to claim 1, characterized in that: The preparation method of the filling modifier comprises: S1, mixing the hydrous allophane nanotubes with anhydrous ethanol, adding 3-aminopropyltriethoxysilane, and then refluxing at 50-70° C. for 3-10 hours. After the treatment, centrifuging, washing and drying are performed to obtain the aminated hydrous allophane nanotubes; S2, adding 3-mercaptobenzoic acid to N,N-dimethylformamide, stirring thoroughly until dissolved, then adding condensing agent EDCl, stirring at room temperature for 0.5-1.5h, then adding activating agent DMAP, stirring again for 0.5-1.5h, then adding amination of allophane nanotubes, first stirring and dispersing evenly, then stirring at room temperature for 20-30h, after the reaction is completed, removing the solvent under reduced pressure, washing and drying, to obtain modified allophane nanotubes; S3. Dissolve allyl phenyl ether in N,N-dimethylformamide, then add modified allophane nanotubes, and after uniform dispersion, introduce nitrogen as protective gas, add photoinitiator, and stir the reaction under ultraviolet light for 1-2 hours. After the reaction is completed, remove the solvent under reduced pressure, wash and dry to obtain a filling modifier.

6. The UV ink for cigarette packaging paper according to claim 5, characterized in that: In the S1, the mass volume ratio of the allophane nanotubes, 3-aminopropyltriethoxysilane and anhydrous ethanol is 1 g: (0.3-0.6) g: (15-35) mL.

7. The UV ink for cigarette packaging paper according to claim 5, characterized in that: In S2, the mass volume ratio of the amino-hydrated allophane nanotubes, 3-mercaptobenzoic acid, condensation agent EDCl, activator DMAP and N,N-dimethylformamide is 1 g: (0.31-0.62) g: (0.4-0.8) g: (0.24-0.48) g: (10-20) mL.

8. The UV ink for cigarette packaging paper according to claim 5, characterized in that: In the S3, the mass volume ratio of the modified allophane nanotubes, allyl phenyl ether, and N,N-dimethylformamide is 1 g: (0.26-0.52) g: (30-50) mL.

9. The UV ink for cigarette packaging paper according to claim 5, characterized in that: In S3, the irradiation intensity of the ultraviolet light is 1.2-2.4 mw / cm 2 , the wavelength is 280-400nm; the photoinitiator is benzoin dimethyl ether or benzoin diethyl ether, and the usage amount is 2%-10% of the mass of the modified allophane nanotubes.

10. A method for preparing UV ink for cigarette packaging paper according to claim 1, characterized in that: The following steps are involved: Step 1, firstly mix polyurethane acrylate, bisphenol A epoxy acrylate and difunctional acrylate, and stir them thoroughly to obtain a mixed resin; Step 2, adding a filler modifier, a pigment, a dispersant and a defoamer into the mixed resin, and then placing it on a three-roll mill for grinding, passing through a 100-300 mesh sieve, to obtain a mixed liquid; Step 3, adding a photoinitiator into the mixed liquid, stirring it thoroughly to obtain UV ink for cigarette packaging paper.

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