Functional adsorption pellet core for cigarette filter and preparation method thereof and cigarette

Abstract

The present invention belongs to the field of cigarette filter adsorption materials, and specifically relates to a functional adsorption pellet core for cigarette filter, a preparation method thereof, and a cigarette. The present invention uses a variety of celluloses, pore formers, hardeners, antistatic agents, water, etc. as raw materials to prepare modified cellulose pellet cores, then washes off the pore formers with water, and impregnates metal ions, and finally obtains a porous modified cellulose pellet core functional adsorption material containing metal ions. The functional adsorption pellet core for cigarette filter provided by the present invention uses three kinds of cellulose as main raw materials, among which the amino group in carbamate cellulose has a certain chemical adsorption effect with hydrogen cyanide and crotonaldehyde, the acetyl group in acetate cellulose easily forms hydrogen bonds with phenol, the carboxyl group in carboxymethyl cellulose has a certain neutralization effect with ammonia, and the good viscosity of the carboxylmethyl itself also promotes the shaping of the pellet core. In addition, after impregnation with metal ions, the metal ions can be complexed with hydrogen cyanide and ammonia, further improving the harm reduction effect.

Description

Technical Field

[0001] The invention belongs to the field of cigarette filter adsorption materials, and in particular relates to a functional adsorption pellet core for a cigarette filter, a preparation method thereof, and a cigarette. Background Art

[0002] As an important part of cigarette products, filter tip can effectively intercept tar and some harmful components in smoke, so it has received widespread attention and wide application. Filter tip is a very important carrier on cigarettes. By adding additives to it, filter tip plays an increasingly important role in improving the sensory quality of cigarette products and intercepting harmful components in cigarette smoke.

[0003] The Chinese invention patent application with application publication number CN110384251A discloses a flavoring particle for cigarette filter, which is made of porous starch, flavor, humectant, filler and binder to form a flavoring ball core, and then spray-coated with a coating liquid made of coating agent, humectant, plasticizer and pigment to form the flavoring particle. It claims that the flavoring particle can improve the comfort of smoking cigarettes and reduce the harm of nicotine and carbon monoxide to smokers, but does not explain its actual effect on reducing harmful components in smoke such as hydrogen cyanide, phenol and crotonaldehyde. Summary of the invention

[0004] The purpose of the present invention is to provide a functional adsorption pellet core for cigarette filters, which can significantly reduce the release of harmful components such as hydrogen cyanide, phenol, crotonaldehyde, etc. in the mainstream smoke of cigarettes, and can be made into a multifunctional additive with good harm reduction effect, color change, flavor enhancement and other functions.

[0005] The second object of the present invention is to provide a method for preparing the functional adsorption pellet core for cigarette filter.

[0006] The third object of the present invention is to provide a cigarette containing the above-mentioned functional adsorption pellet core for cigarette filter.

[0007] In order to achieve the purpose, the technical solution adopted by the present invention is:

[0008] A functional adsorption pellet core for a cigarette filter, the functional adsorption pellet core mainly consisting of a porous cellulose matrix and metal ions complexed on the porous cellulose matrix, the porous cellulose matrix mainly consisting of the following components in parts by weight: 100 parts of cellulose and 1 to 5 parts of a hardener; the cellulose consists of a first cellulose, a second cellulose and a third cellulose in a mass ratio of 1: (0.5 to 2): (0.01 to 0.1), the first cellulose is carbamate cellulose, the second cellulose is acetate cellulose, and the third cellulose is carboxymethyl cellulose; the metal ions are selected from one or a combination of two or more of divalent copper ions, divalent zinc ions, trivalent aluminum ions and trivalent iron ions.

[0009] The functional adsorption ball core for cigarette filter provided by the present invention is based on three kinds of cellulose as main raw materials, wherein the amino group in carbamate cellulose has certain chemical adsorption with hydrogen cyanide and crotonaldehyde, the acetyl group in cellulose acetate easily forms hydrogen bonds with phenol, the carboxyl group in carboxymethyl cellulose has certain neutralization with ammonia, and the good viscosity of carboxymethyl itself also promotes the shaping of the ball core, and after impregnation with metal ions, the metal ions can be complexed with hydrogen cyanide and ammonia, further improving the harm reduction effect. These modified celluloses provide certain physical and chemical basis for the removal of harmful components such as hydrogen cyanide, crotonaldehyde, phenol, and ammonia in cigarette smoke. Its porous structure increases the active sites in contact with smoke, and can be based on the functional components such as loaded pigments, flavors and fragrances, and substantially does not reduce the effect of reducing harmful components in smoke.

[0010] Preferably, the degree of substitution of the first cellulose is 0.05-2.5, the degree of substitution of the second cellulose is 0.2-2.9, and the degree of substitution of the third cellulose is 0.05-1.3. More preferably, the degree of substitution of the first cellulose is 0.1-0.8, the degree of substitution of the second cellulose is 1.0-2.5, and the degree of substitution of the third cellulose is 0.1-0.6.

[0011] The hardener is a material with relatively high hardness. Preferably, the hardener is selected from one, two or three of silicon dioxide, chitin and calcium phosphate.

[0012] In order to improve the antistatic performance of the pellets, reduce the electrostatic adsorption between the pellets and between the pellets and the filter rod tipping paper, and improve the filling capacity and uniformity of the pellets in the filter rod, preferably, the porous cellulose matrix contains an antistatic agent, and the amount of the antistatic agent used is 0.5 to 2 parts per 100 parts of cellulose. The antistatic agent is a commercially available product, preferably a high molecular weight permanent type. For example, it can be one or a combination of two or more of the antistatic agent Irgastat P18, antistatic agent Irgastat P22, antistatic agent Pebax MV1074, antistatic agent Pelestat NC6321, and antistatic agent Irgastat P22.

[0013] Preferably, the functional adsorption pellet core is also equipped with functional ingredients, and the functional ingredients are selected from one or more of pigments, flavors and fragrances, and humectants. By carrying the above functional ingredients, it can show richer material color changes and achieve the effects of cigarette flavoring and moisturizing, thereby improving the characteristics and quality of cigarette products.

[0014] A method for preparing the above-mentioned functional adsorption pellet core for cigarette filter comprises the following steps:

[0015] (1) Extruding, spheronizing and drying a cellulose liquid to obtain a pellet core; the cellulose liquid is composed of the following raw materials in parts by weight: 100 parts of cellulose, 5-20 parts of a pore former, 1-5 parts of a hardener, 0.5-2 parts of an antistatic agent, and 60-90 parts of water; the pore former is selected from a water-soluble salt;

[0016] (2) washing the pellet core with water to form pores, thereby obtaining a preliminarily porous pellet core;

[0017] (3) The preliminary pore-forming pellet core is immersed in a metal ion aqueous solution, filtered, washed with water, and dried.

[0018] The functional adsorption pellets for cigarette filters prepared by the above method have the characteristics of high roundness, high strength, narrow particle size distribution range, and the particle size can be precisely controlled according to actual needs, which can meet the multi-level product requirements of cigarette filter additives. At the same time, the pellet particles have multiple functions. They can not only effectively adsorb harmful components such as hydrogen cyanide, phenol, and crotonaldehyde in cigarette smoke, but some pellet particles can also change color after the smoke passes through. After further carrying functional ingredients, they can also show richer color change effects and functions such as flavor enhancement and moisturizing, thereby improving the characteristics and sensory quality of cigarettes.

[0019] Preferably, in step (1), the water-soluble salt is selected from sodium chloride and / or calcium chloride.

[0020] In step (2), the pellet core obtained in step (1) can be added into deionized water 3-5 times the mass of the pellet core, immersed and stirred at 20-80° C. for 20-60 minutes to complete the pore-forming process.

[0021] Preferably, in step (3), the concentration of the metal ion aqueous solution is 0.5-3 mol / L; the preliminary pore-forming pellets and the metal ion aqueous solution form a mixed solution, and the mass fraction of the preliminary pore-forming pellets in the mixed solution is 15-30%. The metal ion aqueous solution can be aluminum sulfate solution, zinc chloride solution, iron nitrate solution, copper nitrate solution, etc.

[0022] Preferably, in step (3), the immersion is carried out by stirring at 35 to 75° C. for 2 to 4 hours.

[0023] Furthermore, pigments, flavors, fragrances, and moisturizers can be added by spraying, dipping, or the like.

[0024] A cigarette containing the functional adsorption pellet core for cigarette filter, wherein the functional adsorption pellet core is added to the cigarette filter in an amount of 10 to 60 mg per cigarette.

[0025] Based on the above functions of the above pellet core particles, cigarettes equipped with the above pellet cores can achieve multiple functions such as cigarette harm reduction, color change, flavor enhancement and moisturizing, thereby improving the characteristics and sensory quality of cigarettes.

[0026] More preferably, the loading amount of the pellet core particles is 15-45 mg / cigarette. DETAILED DESCRIPTION

[0027] The functional adsorption pellets for cigarette filters provided by the present invention can not only reduce the release of harmful components such as hydrogen cyanide, phenol, crotonaldehyde, etc. in the mainstream smoke of cigarettes, but also the material will change color after the smoke passes through. After further carrying functional ingredients, it can also achieve richer material color changes and enhance the flavor and moisturizing of cigarettes.

[0028] The modified cellulose pellets are prepared with various cellulose, pore formers, hardeners, antistatic agents, water, etc. as raw materials, and then the pore formers are washed away with water and impregnated with metal ions to finally obtain a porous modified cellulose pellet functional adsorption material containing metal ions. Some of the metal ions have their own colors, and when the smoke passes through, the color will change, which increases the visual experience.

[0029] In addition to the removal effect of cellulose and metal ions on harmful components in cigarette smoke, in order to further improve the adsorption effect of the pellet core on harmful components in cigarette smoke, the present invention performs a secondary pore-forming treatment on it. The first pore-forming is generated after the small salt molecules in the pellet core are washed away, and the second pore-forming is generated after the metal ions are complexed with the carboxyl groups in the carboxymethyl cellulose. This may be because the carboxymethyl cellulose is in a swollen state in water. After it is complexed with metal ions, the complex is insoluble in the solvent, thereby forming many holes.

[0030] The above cellulose can be commercially available food-grade products, or can be prepared by yourself with reference to relevant literature. The prior art of preparing carbamate cellulose (i.e. cellulose carbamate) can be referenced to: Yu Guomin, Teng Yunfu, Yi Fan, et al. "Preparation of cellulose carbamate and application of regenerated membrane. Polymer Materials Science and Engineering [J]. 2017, 33(09), etc. The prior art of preparing cellulose acetate can be referenced to: Gao Libin, Zhang Suying, Shi Sheng, et al. "Preparation of cellulose acetate and its structure and properties". Applied Chemical Industry [J]. 2020, 49(01), etc. The prior art of preparing carboxymethyl cellulose can be referenced to: Huang Zhengwei, Ding Changyin. "Synthesis and characterization of sodium carboxymethyl cellulose with high degree of substitution and high uniformity" [J]. 2002, 10(2): 18-23, etc.

[0031] The cellulose can be subjected to ultrafine treatment by using a jet mill. The ultrafine treatment is to improve the processing performance of the pellet core, improve the surface smoothness of the pellet core, and enhance the material performance. The diameter of the cellulose after ultrafine treatment is 5-20 μm.

[0032] The implementation process of the present invention is described in detail below in conjunction with specific embodiments.

[0033] 1. Specific embodiments of functional adsorption pellets for cigarette filters and preparation methods thereof

[0034] Example 1

[0035] The preparation method of the functional adsorption pellet core for cigarette filter of this embodiment adopts the following steps:

[0036] (1) 64 parts of carbamate cellulose (degree of substitution 0.8), 32 parts of cellulose acetate (degree of substitution 1.0), 4 parts of carboxymethyl cellulose (degree of substitution 0.49), 8 parts of sodium chloride, 2 parts of silicon dioxide, 0.9 parts of antistatic agent Irgastat P18 and 82 parts of water are fully mixed, and then modified cellulose pellets are prepared by a technical method such as extrusion-spheronization method known in the art, and then dried and screened.

[0037] (2) Add 100 parts of the modified cellulose pellets prepared above into 350 parts of deionized water, immerse and stir at 30° C. for 20 min, filter, and wash twice.

[0038] (3) 100 parts of the porous pellets from which the porogen has been washed off are added to 350 parts of a 2.8 mol / L aqueous solution of aluminum sulfate, immersed and stirred at 35° C. for 2 h, filtered, washed with water, and dried to obtain a porous modified cellulose pellet with secondary pores.

[0039] The functional adsorption pellets for cigarette filters of this embodiment are composed of a porous cellulose matrix and trivalent aluminum ions complexed on the porous cellulose matrix. The composition thereof can be determined according to the above method description, and the specific description is as follows:

[0040] The porous cellulose matrix is ​​composed of the following components in parts by weight: 100 parts of cellulose, 2 parts of silicon dioxide, and 0.9 parts of antistatic agent Irgastat P18. Carbamate cellulose (substitution degree 0.8), cellulose acetate (substitution degree 1.0), and carboxymethyl cellulose (substitution degree 0.49) are composed in a mass ratio of 64:32:4.

[0041] Example 2

[0042] The preparation method of the functional adsorption pellet core for cigarette filter of this embodiment adopts the following steps:

[0043] (1) 40 parts of carbamate cellulose (degree of substitution 0.1), 59 parts of cellulose acetate (degree of substitution 2.1), 1 part of carboxymethyl cellulose (degree of substitution 0.1), 15 parts of calcium chloride, 3.5 parts of chitin, 2 parts of antistatic agent Irgastat P22 and 71 parts of water are fully mixed, and then a modified cellulose pellet core is prepared by a technical method such as an extrusion-spheronization method known in the art, and then dried and screened.

[0044] (2) Add 100 parts of the modified cellulose pellets prepared above into 450 parts of deionized water, soak and stir at 55° C. for 45 min, filter, and wash twice.

[0045] (3) 100 parts of the porous pellets from which the porogen has been washed off are added to 600 parts of a 1.0 mol / L zinc chloride aqueous solution, immersed and stirred at 60° C. for 3.5 h, filtered, washed with water, and dried to obtain a porous modified cellulose pellet with secondary pores.

[0046] The functional adsorption pellets for cigarette filters of this embodiment are composed of a porous cellulose matrix and divalent zinc ions complexed on the porous cellulose matrix. The composition of the pellets can be determined according to the above method description and will not be described in detail here.

[0047] Example 3

[0048] The preparation method of the functional adsorption pellet core for cigarette filter of this embodiment adopts the following steps:

[0049] (1) 53 parts of carbamate cellulose (degree of substitution 0.62), 42 parts of cellulose acetate (degree of substitution 1.3), 5 parts of carboxymethyl cellulose (degree of substitution 0.6), 6 parts of sodium chloride, 1.2 parts of silicon dioxide, 0.5 parts of antistatic agent Pebax MV1074 and 88 parts of water are fully mixed, and then a modified cellulose pellet core is prepared by a technical method such as an extrusion-spheronization method known in the art, and then dried and screened.

[0050] (2) Add 100 parts of the modified cellulose pellets prepared above into 300 parts of deionized water, immerse and stir at 35° C. for 30 min, filter, and wash twice.

[0051] (3) 100 parts of the porous pellets from which the porogen has been washed off are added to 430 parts of a 2.3 mol / L aqueous solution of ferric nitrate, immersed and stirred at 30° C. for 2.5 h, filtered, washed with water, and dried to obtain a porous modified cellulose pellet with secondary pores.

[0052] The functional adsorption pellets for cigarette filters of this embodiment are composed of a porous cellulose matrix and trivalent iron ions complexed on the porous cellulose matrix. The composition thereof can be determined according to the above method description and will not be described in detail here.

[0053] Example 4

[0054] The preparation method of the functional adsorption pellet core for cigarette filter of this embodiment adopts the following steps:

[0055] (1) 35 parts of carbamate cellulose (degree of substitution 0.32), 63 parts of cellulose acetate (degree of substitution 2.5), 2 parts of carboxymethyl cellulose (degree of substitution 0.38), 20 parts of calcium chloride, 4.6 parts of calcium phosphate, 1.5 parts of antistatic agent Pelestat NC6321 and 75 parts of water are fully mixed, and then a modified cellulose pellet core is prepared by a technical method such as an extrusion-spheronization method known in the art, and then dried and screened.

[0056] (2) Add 100 parts of the modified cellulose pellets prepared above into 500 parts of deionized water, immerse and stir at 70° C. for 60 min, filter, and wash twice.

[0057] (3) 100 parts of the porous pellets from which the porogen has been washed off are added to 620 parts of a 0.7 mol / L aqueous solution of aluminum sulfate, immersed and stirred at 75° C. for 4 h, filtered, washed with water, and dried to obtain a porous modified cellulose pellet with secondary pores.

[0058] The functional adsorption pellets for cigarette filters of this embodiment are composed of a porous cellulose matrix and trivalent aluminum ions complexed on the porous cellulose matrix. The composition thereof can be determined according to the above method description and will not be described in detail here.

[0059] Example 5

[0060] The preparation method of the functional adsorption pellet core for cigarette filter of this embodiment adopts the following steps:

[0061] (1) 45 parts of carbamate cellulose (degree of substitution 0.43), 54 parts of cellulose acetate (degree of substitution 1.6), 1 part of carboxymethyl cellulose (degree of substitution 0.26), 10 parts of sodium chloride, 2.9 parts of chitin, 1.3 parts of antistatic agent Irgastat P22 and 66 parts of water are fully mixed, and then modified cellulose pellets are prepared by a technical method such as extrusion-spheronization method known in the art, and then dried and screened.

[0062] (2) Add 100 parts of the modified cellulose pellets prepared above into 400 parts of deionized water, soak and stir at 45° C. for 40 minutes, filter, and wash twice.

[0063] (3) 100 parts of the porous pellets from which the porogen has been washed off are added to 530 parts of a 1.6 mol / L copper nitrate aqueous solution, immersed and stirred at 50° C. for 3 h, filtered, washed with water, and dried to obtain a porous modified cellulose pellet with secondary pores.

[0064] The functional adsorption pellets for cigarette filters of this embodiment are composed of a porous cellulose matrix and divalent copper ions complexed on the porous cellulose matrix. The composition thereof can be determined according to the above method description and will not be described in detail here.

[0065] Example 6

[0066] The preparation method of the functional adsorption pellets for cigarette filters of this embodiment is to add 10g of the porous modified cellulose pellets in Example 1 into 50g of 0.02% amaranth aqueous solution, immerse and stir for 3h, filter, wash and dry to obtain color-changing porous modified cellulose pellets.

[0067] The functional adsorption pellets for cigarette filters of this embodiment are obtained by further loading the pigment amaranth on the porous modified cellulose pellets of Example 1.

[0068] Example 7

[0069] The preparation method of the functional adsorption pellets for cigarette filters of this embodiment is to add 0.05g of tobacco flavor (special for golden leaf) to 10g of the porous modified cellulose pellet particles in Example 1 by spraying, and obtain porous modified cellulose pellet particles with flavoring function after drying.

[0070] Example 8

[0071] The preparation method of the functional adsorption pellets for cigarette filters of this embodiment is to add 0.1g of tobacco humectant (propylene glycol) to 10g of the porous modified cellulose pellet particles in Example 1 by mist spraying, and obtain porous modified cellulose pellet particles with a humectant function after drying.

[0072] Example 9

[0073] The preparation method of the functional adsorption pellets for cigarette filters in this embodiment is to add 0.05g of tobacco flavor (same as in Example 7) to 10g of the porous modified cellulose pellets in Example 6 by spraying, and obtain porous modified cellulose pellets with color-changing and flavor-enhancing functions after drying.

[0074] 2. Specific Examples of Cigarettes

[0075] Example 10

[0076] The cigarette containing the above-mentioned functional adsorption pellets for cigarette filters of this embodiment is prepared by adding the functional adsorption pellets for cigarette filters of Example 1 in an amount of 40 mg per cigarette into a ternary hollow transparent composite filter rod to form a cigarette.

[0077] 3. Test Examples

[0078] Test Example 1

[0079] The 9 materials prepared in Examples 1-9 were applied to the ternary hollow transparent composite filter rod, with an addition amount of 40 mg per cigarette, and were marked as test cigarettes 1 to 9, respectively. The cigarettes without any adsorbent material added to the ternary hollow transparent composite filter rod were used as control cigarettes. The cigarettes used were balanced for 48 hours under the conditions of temperature (22±1)°C and relative humidity (60±2)% before the test, and then sorted by weight (average weight ±0.02g) and draw resistance (average draw resistance ±49Pa), and the test cigarettes that met the standards were picked out. The cigarette smoking test was carried out on the smoking machine according to the standard smoking conditions, and the release of hydrogen cyanide, crotonaldehyde and ammonia were tested according to the standards YCT253-2008, YCT254-2008 and YCT377-2017, respectively. The results are shown in Table 1.

[0080] Table 1 Results of the release of hydrogen cyanide, crotonaldehyde and ammonia in mainstream cigarette smoke

[0081]

[0082] As shown in Table 1, the 9 materials in the embodiment can effectively reduce the release of hydrogen cyanide, crotonaldehyde, ammonia and phenol in the mainstream smoke of cigarettes, among which the reduction rate of hydrogen cyanide is 30-60%, the reduction rate of crotonaldehyde is 25-40%, the reduction rate of ammonia is 20-30%, and the reduction rate of phenol is 20-45%.

[0083] In addition, compared with the material in Example 1, the harm reduction effect of the materials in Examples 6 to 9 is reduced to varying degrees, but the reduction is limited. This shows that the porous modified cellulose pellets still have good harm reduction performance after being treated with color change, flavor enhancement, and moisture retention. Among them, Example 9 simultaneously loads pigments and flavors, and its effect on reducing the release of hydrogen cyanide, crotonaldehyde, ammonia and phenol in mainstream cigarette smoke is still basically maintained.

[0084] Test Example 2

[0085] The materials prepared in Example 5, Example 6 and Example 9 were respectively applied to the ternary hollow transparent composite filter rod, and the addition amount was 40 mg per cigarette. The cigarettes used were balanced for 48 hours under the conditions of temperature (22±1)°C and relative humidity (60±2)% before testing, and then sorted by weight (average weight±0.02g) and draw resistance (average draw resistance±49Pa), and the test cigarettes that met the standards were picked out. The cigarette smoking test was carried out on a smoking machine according to standard smoking conditions. After smoking, the material prepared in Example 5 changed from blue to light green, the material prepared in Example 6 changed from red to light pink, and the material prepared in Example 9 changed from red to light pink.

[0086] Test Example 3

[0087] The materials prepared in Example 1 and Examples 7 to 9 were respectively applied to the ternary hollow transparent composite filter rod, with the addition amount being 40 mg per cigarette, and the cigarette sensory evaluation was performed. The material in Example 1 was used as a control, and the results showed that the materials in Example 7 and Example 9 both had the effect of increasing the flavor and improving the quality of cigarettes, and the material in Example 8 had the effect of reducing irritation and impurities and improving the comfort of the mouth feel.

[0088] Test Example 4

[0089] For the functional adsorption pellets for cigarette filters of Example 1, the BET specific surface area of ​​the pellets prepared in step (2) is 3.56 m 2 / g, the BET specific surface area of ​​the pellet core prepared in step (3) is 37.72m 2 / g, which proves that metal ion impregnation has a secondary pore-forming effect on the cellulose matrix, increasing the pore-forming area and further improving the adsorption effect of the pellet core on the harmful components of cigarette smoke.

Claims

1. A functional adsorption pellet for a cigarette filter, characterized in that: The functional adsorption ball core is mainly composed of a porous cellulose matrix and metal ions complexed on the porous cellulose matrix, wherein the porous cellulose matrix is ​​mainly composed of the following components in parts by weight: 100 parts of cellulose and 1-5 parts of a hardener; the cellulose is composed of a first cellulose, a second cellulose and a third cellulose in a mass ratio of 1: (0.5-2): (0.01-0.1), wherein the first cellulose is carbamate cellulose, the second cellulose is cellulose acetate, and the third cellulose is carboxymethyl cellulose; the metal ions are selected from one or a combination of two or more of divalent copper ions, divalent zinc ions, trivalent aluminum ions and trivalent iron ions; The preparation method of the functional adsorption pellet core comprises the following steps: (1) Extruding, spheronizing and drying a cellulose liquid to obtain a pellet core; the cellulose liquid is composed of the following raw materials in parts by weight: 100 parts of cellulose, 5-20 parts of a pore former, 1-5 parts of a hardener, 0.5-2 parts of an antistatic agent, and 60-90 parts of water; the pore former is selected from a water-soluble salt; (2) washing the pellet core with water to form pores, thereby obtaining a preliminarily porous pellet core; (3) Immerse the initially porous pellet core in a metal ion aqueous solution, filter, wash with water, and dry.

2. The functional adsorption pellet core for cigarette filter according to claim 1, characterized in that: The degree of substitution of the first cellulose is 0.05-2.5, the degree of substitution of the second cellulose is 0.2-2.9, and the degree of substitution of the third cellulose is 0.05-1.

3.

3. The functional adsorption pellet core for cigarette filter according to claim 2, characterized in that: The degree of substitution of the first cellulose is 0.1-0.8, the degree of substitution of the second cellulose is 1.0-2.5, and the degree of substitution of the third cellulose is 0.1-0.

6.

4. The functional adsorption pellet core for cigarette filter according to claim 1, characterized in that: The hardener is selected from one, two or three of silicon dioxide, chitin and calcium phosphate.

5. The functional adsorption pellet core for cigarette filter according to any one of claims 1 to 4, characterized in that: The functional adsorption pellet core is also loaded with functional ingredients, and the functional ingredients are selected from one or a combination of two or more of pigments, flavors and fragrances, and moisturizers.

6. A method for preparing a functional adsorption pellet core for a cigarette filter according to any one of claims 1 to 5, characterized in that: The following steps are involved: (1) Extruding, spheronizing and drying a cellulose liquid to obtain a pellet core; the cellulose liquid is composed of the following raw materials in parts by weight: 100 parts of cellulose, 5-20 parts of a pore former, 1-5 parts of a hardener, 0.5-2 parts of an antistatic agent, and 60-90 parts of water; the pore former is selected from a water-soluble salt; (2) washing the pellet core with water to form pores, thereby obtaining a preliminarily porous pellet core; (3) Immerse the initially porous pellet core in a metal ion aqueous solution, filter, wash with water, and dry.

7. The method for preparing the functional adsorption pellet core for cigarette filter according to claim 6, characterized in that: In step (1), the water-soluble salt is selected from sodium chloride and / or calcium chloride.

8. The method for preparing the functional adsorption pellet core for cigarette filter according to claim 6, characterized in that: In step (3), the concentration of the metal ion aqueous solution is 0.5-3 mol / L; the preliminary pore-forming pellets and the metal ion aqueous solution form a mixed solution, and the mass fraction of the preliminary pore-forming pellets in the mixed solution is 15-30%.

9. The method for preparing a functional adsorption pellet core for a cigarette filter according to any one of claims 6 to 8, characterized in that: In step (3), the immersion is carried out by stirring at 35-75° C. for 2-4 hours.

10. A cigarette containing the functional adsorption pellet core for cigarette filter according to any one of claims 1 to 5, characterized in that: The functional adsorption pellet core is added to the cigarette filter in an amount of 10-60 mg / cigarette.

Images