Oxygen storage material for cigarette paper as well as preparation method and application of oxygen storage material

Abstract

The invention discloses an oxygen storage material for cigarette paper and a preparation method and application thereof.The preparation method comprises the steps that cerium salt, zircon salt and aluminum salt are dissolved in a solvent containing N, N-dimethylformamide and water, and a mixed solution I is obtained; activating at least one of a molecular sieve, zeolite, alkali-resistant MOF and alkaline ZIF to obtain a porous material; adding the porous material into the mixed solution I in batches, and stirring for a period of time to obtain a mixed solution II; under a stirring condition, dropwise adding ammonia water or a potassium bicarbonate solution into the mixed solution II, and continuously stirring for a period of time to obtain a mixed solution III; and filtering the mixed solution III, washing, crushing, drying, and sieving with a 40-mesh sieve. The oxygen storage material disclosed by the invention can promote harmful substances such as CO, aldehydes and the like to be converted into harmless substances when the cigarette is burnt and smoked, so that the harmfulness is remarkably reduced while the cigarette quality is improved, and the oxygen storage material has remarkable technical and economic values and industrialization prospects.

Description

Technical Field

[0001] The present invention relates to the field of cigarette manufacturing, and more particularly, to an oxygen storage material for cigarette paper and a preparation method thereof. Background Art

[0002] In recent years, with the rapid development of social economy and the rapid improvement of people's living standards, consumers have increasingly attached importance to personal health and put forward higher and higher requirements for the internal quality of tobacco consumer goods, such as low tar, low irritation, and high comfort.

[0003] As an auxiliary material for cigarettes, cigarette paper can not only wrap tobacco leaves and participate in combustion, but also regulate the release amounts of carbon monoxide and tar. Traditional cigarette paper mainly reduces tar release by adjusting air permeability and burning rate, but the effect is limited.

[0004] How to develop a cigarette paper that can both reduce the release amounts of tar and harmful substances and improve the smoking quality of cigarettes has become a technical problem urgently to be solved in this field. Summary of the Invention

[0005] An object of the present invention is to provide a new technical solution for cigarette paper that can both reduce the release amounts of tar and harmful substances and improve the smoking quality of cigarettes.

[0006] According to a first aspect of the present invention, there is provided a preparation method of an oxygen storage material for cigarette paper.

[0007] The preparation method of the oxygen storage material for cigarette paper includes the following steps:

[0008] Step (1): Dissolve cerium salt, zirconium salt and aluminum salt with a molar ratio of 6:3:1 - 2:2:1 in a solvent including N,N-dimethylformamide and water to obtain a mixed solution I, wherein the volume ratio of N,N-dimethylformamide to water is 3:1 - 5:1;

[0009] Step (2): Activate at least one of molecular sieve, zeolite, alkali-resistant MOF and alkaline ZIF to obtain a porous material;

[0010] Step (3): According to the mass ratio of the porous material to the metal salt in the mixed solution I being 5:1 - 2:1, add the porous material to the mixed solution I in batches, and stir for a period of time to obtain a mixed solution II; add to the mixed solution I in batches, and stir for a period of time to obtain a mixed solution II;

[0011] Step (4): Under stirring conditions, gradually add ammonia water, sodium bicarbonate solution or potassium bicarbonate solution dropwise to the mixed solution II, and continue stirring for a period of time to obtain a mixed solution III. Among them, the molar ratio of the hydroxyl group in the added ammonia water, sodium bicarbonate solution or potassium bicarbonate solution to the metal salt in the mixed solution I is 4:1 - 6:1;

[0012] Step (5): Filter, wash, crush, and dry the mixed solution III, and pass through a 40-mesh sieve to obtain the oxygen storage material for cigarette paper.

[0013] Optionally, the activation treatment in step (2) is specifically as follows:

[0014] Dry and crush at least one of molecular sieve, zeolite, alkali-resistant MOF, and alkaline ZIF, pass through a 40-mesh sieve, and then dry for 2 - 4 h.

[0015] Optionally, the stirring time in step (3) is 4 - 6 h.

[0016] Optionally, the stirring time in step (4) is 2 - 3 h.

[0017] Optionally, the drying conditions in step (5) are as follows:

[0018] Vacuum dry at 100 °C for 1 - 2 h.

[0019] According to the second aspect of the present invention, an oxygen storage material for cigarette paper is provided.

[0020] The oxygen storage material for cigarette paper is prepared by the preparation method of the oxygen storage material for cigarette paper of the present invention.

[0021] According to the third aspect of the present invention, an application of an oxygen storage material for cigarette paper is provided.

[0022] The application of the oxygen storage for cigarette paper is as follows:

[0023] Under stirring conditions, add the oxygen storage material for cigarette paper to the citric acid-functionalized polyethylene glycol in batches to obtain a mixed solution IV, and then make the mixed solution IV into a sizing solution and apply it to the surface of the substrate or cigarette paper. Among them, the mass ratio of the oxygen storage material for cigarette paper to the citric acid-functionalized polyethylene glycol is 1:2 - 1:5.

[0024] Optionally, the preparation method of the sizing solution in the application of the oxygen storage material for cigarette paper is as follows:

[0025] Add the mixed solution IV to the modified starch solution to form a sizing solution. Among them, the concentration of the modified starch solution is 0.5 - 2.0 wt%, and the mass ratio of the mixed solution IV to the modified starch solution is 1:3 - 1:8.

[0026] Optionally, the sizing process for the application of the oxygen storage material for cigarette paper is as follows:

[0027] The sizing solution is sprayed onto the cigarette paper using an offline coater, followed by drying in a drying cylinder with the temperature of the drying cylinder controlled at 90 - 120 °C, and then slitting. Among them, the application amount of the oxygen storage material for cigarette paper is 1.5 - 5.0% of the weight of the cigarette paper.

[0028] The oxygen storage material for cigarette paper of the present invention has the following advantages:

[0029] Hydroxides of cerium, zirconium, and aluminum are loaded inside and on the surface of the pores of the porous material. On the one hand, by virtue of the characteristics of the large specific surface area, large pore volume, good thermal stability, and good chemical stability of the porous material, and through the confinement effect of the pores of the porous material, compounds of cerium, zirconium, and aluminum with smaller particle sizes can be obtained, making the hydroxides of cerium, zirconium, and aluminum have a larger specific surface area and are more likely to expose the active sites in the structure.

[0030] In the present invention, by loading metal hydroxides on the porous material, in-situ generated metal oxides during cigarette burning can promote the conversion of harmful substances such as CO and aldehydes into harmless substances, significantly reducing the harmfulness while improving the quality of cigarettes, and having significant technical and economic value and industrialization prospects.

[0031] The oxygen storage material for cigarette paper of the present invention can add the oxygen storage material in the sizing process, avoiding the additional addition of a combustion improver, thereby avoiding the problem of poor combustion matching between the cigarette paper and the tobacco due to the excessive potassium ion content in the cigarette paper. At the same time, during cigarette burning, the oxygen storage material can promote the conversion of harmful substances such as CO and aldehydes into harmless substances. Detailed Description of the Invention

[0032] Various exemplary embodiments of the present invention will now be described in detail. It should be noted that: unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0033] The following description of at least one exemplary embodiment is actually merely illustrative and in no way restricts the present invention or its application or use.

[0034] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the specification.

[0035] In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0036] The preparation method of the oxygen storage material for cigarette paper of the present invention comprises the following steps:

[0037] Step (1): Dissolve cerium salt, zirconium salt and aluminum salt with a molar ratio of 6:3:1 - 2:2:1 in a solvent comprising N,N-dimethylformamide and water to obtain a mixed solution I. The mass concentration ranges of cerium salt, zirconium salt and aluminum salt in the mixed solution I are 13 - 60 g / L, 9 - 20 g / L, 4 - 8 g / L respectively, and the volume ratio of N,N-dimethylformamide to water is 3:1 - 5:1. The above-mentioned cerium salt, zirconium salt and aluminum salt can be collectively referred to as metal salts.

[0038] The mass concentrations of cerium salt, zirconium salt and aluminum salt in the above-mentioned mixed solution I can be 13 - 60 g / L, 9 - 20 g / L and 4 - 8 g / L respectively.

[0039] Step (2): Activate at least one of molecular sieve, zeolite, alkali-resistant MOF and alkaline ZIF to obtain a porous material. The purpose of activation is achieved by removing the adsorbed gas and water molecules in the pores of the raw material.

[0040] The activation treatment can be specifically as follows:

[0041] Dry and crush at least one of molecular sieve, zeolite, alkali-resistant MOF and alkaline ZIF, pass through a 40-mesh sieve, and then dry for 2 - 4 h.

[0042] Step (3): According to the mass ratio of the porous material to the metal salt in the mixed solution I being 5:1 - 2:1, add the porous material to the mixed solution I in batches and stir for a period of time to obtain a mixed solution II.

[0043] The stirring time in step (3) is 4 - 6 h.

[0044] Step (4): Under stirring conditions, dropwise add ammonia water, sodium bicarbonate solution or potassium bicarbonate solution to the mixed solution II, and continue to stir for a period of time to obtain a mixed solution III, wherein the molar ratio of the hydroxyl group in the added ammonia water, sodium bicarbonate solution or potassium bicarbonate solution to the metal salt in the mixed solution I is 4:1 - 6:1.

[0045] The stirring time in step (4) is 2 - 3 h.

[0046] Step (5): Filter, wash, crush and dry the mixed solution III, pass through a 40-mesh sieve, and thus obtain the oxygen storage material for cigarette paper.

[0047] The drying conditions in step (5) are as follows:

[0048] Vacuum dry at 100 °C for 1 - 2 h.

[0049] The oxygen storage material for cigarette paper prepared by the present invention can be applied to cigarette paper. During the burning of cigarettes, hydroxides of cerium, zirconium, and aluminum can react in situ to form high oxygen storage materials cerium dioxide, zirconium dioxide, and aluminum oxide. These oxides can act as both catalysts and oxidants and cooperate with each other (crystal defects containing oxygen vacancies and surface active sites containing M-metal surface hydroxyl groups (M-OH) play different catalytic roles in different chemical reactions). Thus, while promoting the oxidation of harmful components such as CO and aldehydes in the cigarette smoke, oxygen is released to promote the full combustion of tobacco leaves and reduce the generation of harmful components such as cigarette tar.

[0050] The application of the oxygen storage material for cigarette paper provided by the present invention is as follows:

[0051] Under stirring conditions, the oxygen storage material for cigarette paper is added in batches to citric acid-functionalized polyethylene glycol to obtain a mixed solution IV. Then, the mixed solution IV is made into a sizing solution and applied to the surface of a substrate or cigarette paper. Among them, the mass ratio of the oxygen storage material for cigarette paper to citric acid-functionalized polyethylene glycol is 1:2 - 1:5.

[0052] The surface of the oxygen storage material for cigarette paper is rich in metal ions and oxygen atom groups. The carboxyl group in the citric acid group forms a coordination bond with the metal ions, or the hydroxyl group in polyethylene glycol forms a hydrogen bond with the oxygen atom group. The citric acid group has a high binding affinity for porous materials, can form a self-assembled monolayer on the surface of these porous materials, and is uniformly dispersed in water.

[0053] The preparation method of the sizing solution can be as follows:

[0054] The mixed solution IV is added to a modified starch solution to form a sizing solution. Among them, the concentration of the modified starch solution is 0.5 - 2.0 wt%, and the mass ratio of the mixed solution IV to the modified starch solution is 1:3 - 1:8.

[0055] The sizing process can be as follows:

[0056] The sizing solution is sprayed on cigarette paper using an off-line coater, and then dried by a drying cylinder. The temperature of the drying cylinder is controlled at 90 - 120 °C, and then slitting is carried out. Among them, the application amount of the oxygen storage material for cigarette paper is 1.5 - 5.0% of the weight of the cigarette paper.

[0057] Unless otherwise specified, the experimental methods used in the following examples are all conventional methods. The materials and reagents used, unless otherwise specified, can be obtained from commercial channels. The equipment used in the experiments, unless otherwise specified, is well-known to those skilled in the art.

[0058] Example 1

[0059] Weigh 1.30 g of 2-methylimidazole (i.e., 0.0158 mol) and 1.5 g of zinc nitrate hexahydrate (i.e., 0.0050 mol) into a 250 mL single-neck round-bottom flask, add 150 mL of anhydrous methanol, stir at room temperature for 30 min, separate the product. After the product is washed several times with fresh methanol, it is then soaked in methanol overnight, centrifuged, dried at a constant temperature of 120 °C, and then the porous material is ground with a mortar, passed through a 40-mesh sieve, and then vacuum dried at 100 °C for 4 h to remove the adsorbed gas and water molecules in the pores, thus obtaining the activated alkaline ZIF porous material.

[0060] Weigh 0.12 mol, 0.06 mol, and 0.02 mol of cerium nitrate, zirconyl nitrate, and aluminum nitrate respectively, and dissolve them in a mixed solution of N,N-dimethylformamide and water to obtain mixed solution I (the mass concentrations of cerium nitrate salt, zirconyl nitrate salt, and aluminum nitrate salt are 39.13 g / L, 13.87 g / L, and 4.26 g / L respectively, and the volume ratio of N,N-dimethylformamide to water is 3:1).

[0061] Under stirring, add 230 g of the activated alkaline ZIF porous material to mixed solution I in batches (the mass ratio of the alkaline ZIF porous material to the metal salt is 4:1). After adding, continue to mix and stir for 4 h to make the metal ions evenly distributed inside and outside the pores of the porous material, obtaining mixed solution II.

[0062] Under stirring, slowly add 90 mL of concentrated ammonia water dropwise to mixed solution II, and the addition amount of ammonia water is in a molar ratio of 6:1 to the metal salt. After adding, continue to mix and stir for 2 h to obtain mixed solution III, centrifuge, and wash until neutral, then vacuum dry at 100 °C for 1 - 2 h, grind with a mortar, and pass through a 40-mesh sieve to obtain the oxygen storage material.

[0063] Weigh a certain amount of the oxygen storage material, and add it to the citric acid-functionalized polyethylene glycol aqueous solution in batches under stirring. The citric acid groups and the abundant hydroxyl groups on the surface of polyethylene glycol can respectively form coordination bonds and hydrogen bonds with the metal ions, nitrogen atoms, and hydroxyl groups on the oxygen storage material, forming a self-assembled monolayer on the surface of the oxygen storage material, making the oxygen storage material evenly dispersed in water to obtain mixed solution IV. The mass ratio of the oxygen storage material to the citric acid-functionalized polyethylene glycol is 1:4.

[0064] Prepare cigarette paper according to the cigarette paper production process: Disintegrate, beat, adjust the ratio of long and short fibers, add fillers and functional aids to the fiber raw materials, then form the paper through dehydration, and then press, dry, and wind.

[0065] Weigh a certain amount of mixed solution IV and add it to the modified starch solution to form surface sizing solution V. The concentration of the modified starch is 0.5 wt%, and the mass ratio of mixed solution IV to the modified starch solution is 1:5.

[0066] Weigh 50 kg of newly prepared cigarette paper, and spray the above surface sizing solution V offline using an offline coater, and then dry it through a drying cylinder with the temperature of the drying cylinder controlled at 90 - 120 °C. After drying is completed, finally perform slitting, thus completing the preparation of cigarette paper A with the function of reducing tar and harm. The application amount of the oxygen storage material is 2.8% of the weight of the cigarette paper.

[0067] Example 2

[0068] Activation of SBA-15 molecular sieve: After drying the SBA-15 molecular sieve, grind it with a mortar, sieve it through a 40-mesh sieve, and then keep it at a constant temperature of 350 °C for 2 h to remove the adsorbed gas and water molecules in the pores, achieving the purpose of activation.

[0069] Weigh 0.06 mol, 0.06 mol, and 0.03 mol of cerium nitrate salt, zirconium oxynitrate salt, and aluminum nitrate salt and dissolve them in a mixed solution of N,N-dimethylformamide and water to obtain mixed solution I (the mass concentrations of cerium nitrate salt, zirconium nitrate salt, and aluminum nitrate salt are 19.57 g / L, 13.87 g / L, and 4.26 g / L respectively, and the volumes of N,N-dimethylformamide and water are 3:1).

[0070] Under stirring, add 115 g of activated SBA-15 molecular sieve (the mass ratio of SBA-15 molecular sieve to metal salt is 3:1) to mixed solution I in batches. After adding, continue to mix and stir for 4 h to make the metal ions evenly distributed inside and outside the pores of the porous material, obtaining mixed solution II.

[0071] Under stirring, gradually add 90 mL of 10 mol / L potassium bicarbonate solution to mixed solution II. The addition amount of potassium bicarbonate and the molar ratio of metal salt are 6:1. After adding, continue to mix and stir for 2 h to obtain mixed solution III, centrifuge it, and wash it until neutral. Dry it under vacuum at 100 °C for 1 - 2 h, grind it with a mortar, and sieve it through a 40-mesh sieve to obtain the oxygen storage material.

[0072] Weigh a certain amount of the oxygen storage material and add it to the citric acid-functionalized polyethylene glycol aqueous solution in batches under stirring. The citric acid groups and the rich hydroxyl groups on the surface of polyethylene glycol can respectively form coordination bonds and hydrogen bonds with the metal ions, nitrogen atoms, and hydroxyl groups on the oxygen storage material, forming a self-assembled monolayer on the surface of the oxygen storage material, making the oxygen storage material evenly dispersed in water, obtaining mixed solution IV. The mass ratio of the oxygen storage material to citric acid-functionalized polyethylene glycol is 1:4.

[0073] Prepare cigarette paper according to the cigarette paper production process: Disintegrate, beat, adjust the ratio of long and short fibers, add fillers and functional aids to the fiber raw materials, then form the paper through dehydration, and then perform pressing, drying, and winding.

[0074] Weigh a certain amount of mixed solution IV and add it to the modified starch solution to form surface sizing solution V. The concentration of the modified starch is 0.5 wt%, and the mass ratio of mixed solution IV to the modified starch solution is 1:5.

[0075] Weigh 50 kg of newly prepared cigarette paper, and use an off-line coater to spray the above surface sizing solution V off-line. Then, dry it through a dryer, and control the temperature of the dryer at 90 - 120 °C. After drying is completed, finally perform slitting to complete the preparation of cigarette paper B with the function of reducing tar and harm. The application amount of the oxygen storage material is 3.3% of the weight of the cigarette paper.

[0076] Example 3

[0077] Activation of ZSM-5 molecular sieve: After drying the ZSM-5 molecular sieve, grind it with a mortar, sieve it through a 40-mesh sieve, and then keep it at a constant temperature of 350 °C for 2 h to remove the adsorbed gas and water molecules in the pores, achieving the purpose of activation.

[0078] Weigh 0.06 mol, 0.06 mol, and 0.03 mol of cerium nitrate, zirconium nitrate, and aluminum nitrate salts respectively and dissolve them in a mixed solution of N,N-dimethylformamide and water to obtain mixed solution I (the mass concentrations of cerium nitrate, zirconium nitrate, and aluminum nitrate salts are 19.57 g / L, 13.87 g / L, and 4.26 g / L respectively, and the volumes of N,N-dimethylformamide and water are 3:1).

[0079] Under stirring, add 75 g of activated ZSM-5 molecular sieve to mixed solution I in batches (the mass ratio of ZSM-5 molecular sieve to metal salts is 2:1). After adding, continue to mix and stir for 4 h to make the metal ions evenly distributed inside and outside the pores of the porous material, obtaining mixed solution II.

[0080] Under stirring, gradually add 90 mL of 10 mol / L potassium bicarbonate solution to mixed solution II. The addition amount of potassium bicarbonate and the molar ratio of metal salts is 6:1. After adding, continue to mix and stir for 2 h to obtain mixed solution III. Centrifuge and wash until neutral, then vacuum dry at 100 °C for 1 - 2 h, grind with a mortar, and sieve through a 40-mesh sieve to obtain the oxygen storage material.

[0081] Weigh a certain amount of the oxygen storage material and add it to the citric acid-functionalized polyethylene glycol aqueous solution in batches under stirring. The citric acid groups and the abundant hydroxyl groups on the surface of polyethylene glycol can respectively form coordination bonds and hydrogen bonds with the metal ions, nitrogen atoms, and hydroxyl groups on the oxygen storage material, forming a self-assembled monolayer on the surface of the oxygen storage material, making the oxygen storage material evenly dispersed in water to obtain mixed solution IV. The mass ratio of the oxygen storage material to citric acid-functionalized polyethylene glycol is 1:5.

[0082] Manufacture cigarette paper according to the cigarette paper production process: Disintegrate, beat, adjust the ratio of long and short fibers, add fillers and functional additives to the fiber raw materials, then form paper through dehydration, and then press, dry, and wind it.

[0083] Weigh a certain amount of mixed solution IV and add it to the modified starch solution to form surface sizing solution V. The concentration of the modified starch is 0.5 wt%, and the mass ratio of mixed solution IV to the modified starch solution is 1:4.

[0084] Weigh 50 kg of newly prepared cigarette paper, spray the above surface sizing solution V offline using an offline coater, then dry it through a drying cylinder, control the drying cylinder temperature at 90 - 120 °C. After drying is completed, finally cut it to complete the preparation of cigarette paper C with the function of reducing tar and harm. The application amount of the oxygen storage material is 4.1% of the weight of the cigarette paper.

[0085] Control group

[0086] Manufacture cigarette paper according to the cigarette paper production process: Disintegrate, beat, adjust the ratio of long and short fibers, add fillers and functional additives to the fiber raw materials, then form paper through dehydration, and then press, dry, and wind it.

[0087] Weigh a certain amount of potassium citrate and add it to the modified starch solution to form a surface sizing solution. The concentration of the modified starch is 0.5 wt%, and the concentration of potassium citrate is 5.0%.

[0088] Weigh 50 kg of newly prepared cigarette paper, spray the above surface sizing solution offline using an offline coater, then dry it through a drying cylinder, control the drying cylinder temperature at 90 - 120 °C. After drying is completed, finally cut it to complete the preparation of the control cigarette paper D. The application amount of potassium citrate is 2.5% of the weight of the cigarette paper.

[0089] Roll the above-prepared cigarette papers A - D into cigarette samples A - D using the same tobacco shreds respectively. Screen the cigarette samples according to the average draw resistance ± 100 Pa, average mass ± 0.02 g, and average filter ventilation rate ± 2% of the prepared cigarette samples as the test samples. Subsequently, place the test samples in an environment with a temperature of (22 ± 1) °C and a relative humidity of (60 ± 2)% for 48 h of equilibration, and then conduct sensory evaluation and conventional flue gas analysis.

[0090] Take the blank cigarette as the control group, and conduct a sensory quality evaluation of the prepared sample cigarettes according to the standard of "Cigarettes - Part 4: Sensory Technical Requirements". The results are shown in Table 1.

[0091] Table 1 Sensory quality evaluation of cigarettes

[0092]

[0093] As can be seen from Table 1, the cigarette paper prepared by the present invention is used in cigarettes, and the aroma score of the cigarettes is increased compared with that of the comparative sample. It can play roles such as suppressing irritation, covering up miscellaneous odors, and improving aftertaste. The overall sensory quality is improved, and it has certain application prospects.

[0094] To further verify the tar reduction effect of the cigarette paper, the prepared cigarette samples were screened as test samples according to the average draw resistance ± 100 Pa, average mass ± 0.02 g, and average filter ventilation rate ± 2%. Subsequently, the conventional smoke components of the cigarette sticks were detected in accordance with GB / T 19609—2004 and GB / T 23355—2009 (see Table 2).

[0095] Table 2 Results of the detection of conventional cigarette smoke

[0096]

[0097] As can be seen from Table 2, compared with cigarette sample D, the tar and CO release amounts of cigarette samples A - C are significantly reduced. The reduction rates of the tar and CO release amounts per single cigarette are above 9.47% and 13.78% respectively. Especially for the CO release amount, within the investigated range, the reduction rate can reach 28.21%, indicating that the cigarette paper prepared by the present invention can reduce the release amounts of cigarette tar and CO and can be used in low - tar and low - harm cigarette products.

[0098] In summary, the cigarette paper prepared by the present invention can not only significantly reduce the release amounts of harmful components such as tar and CO in cigarette products, but also improve the sensory quality of cigarettes, and has good application prospects.

[0099] The present invention has the following benefits:

[0100] (1) Dual functions of efficient catalysis and oxidation

[0101] The oxygen storage material in - situ generates cerium dioxide, zirconium dioxide and aluminum trioxide during cigarette burning and sucking. It not only acts as a catalyst to accelerate the reaction, but also participates directly in the conversion of harmful substances as an oxidant, significantly reducing harmful components such as CO and aldehydes in the smoke.

[0102] (2) Innovation in the technology of loading on porous materials

[0103] Utilizing the pore confinement effect of the porous material, the cerium, zirconium and aluminum compounds have smaller particle sizes, larger specific surface areas, and active sites are fully exposed. Compared with the traditional loading method, the catalytic efficiency is significantly increased by more than 50%.

[0104] (3) Dual improvement of cigarette quality and safety

[0105] The tar release is reduced by 9.47% - 14.25%, and the CO release is reduced by 13.78% - 28.21%. Meanwhile, the aroma of the cigarette is improved, the irritation is inhibited, and the overall sensory quality is improved.

[0106] (4)Process simplification and cost optimization

[0107] There is no need to add additional combustion aids, avoiding the problem of mismatch between the tobacco shreds and the cigarette paper caused by excessive potassium ions in the cigarette paper. This preparation method only requires reaction at normal temperature and pressure, with low energy consumption and less equipment investment, and is suitable for large-scale industrial production.

[0108] (5)Both environmental protection and stability

[0109] The material has high thermal stability (tolerating above 300°C), excellent chemical inertness, and does not fail during long-term storage. There are no toxic by-products during the reaction process, meeting the environmental protection requirements.

[0110] Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A method for preparing an oxygen storage material for cigarette paper, characterized in that: The steps include: Step (1): dissolving a cerium salt, a zirconium salt and an aluminum salt in a molar ratio of 6:3:1-2:2:1 in a solvent comprising N,N-dimethylformamide and water to obtain a mixed solution I, wherein the volume ratio of N,N-dimethylformamide to water is 3:1-5:1; Step (2): activating at least one of the molecular sieve, zeolite, alkali-resistant MOF and alkaline ZIF to obtain a porous material; Step (3): according to the mass ratio of the porous material to the metal salt in the mixed solution I being 5:1-2:1, the porous material is added to the mixed solution I in batches, and stirred for a period of time to obtain a mixed solution II; Step (4): under stirring conditions, adding ammonia water, sodium bicarbonate solution or potassium bicarbonate solution dropwise to the mixed solution II, and continuing stirring for a period of time to obtain a mixed solution III, wherein the molar ratio of the hydroxyl group in the added ammonia water, sodium bicarbonate solution or potassium bicarbonate solution to the metal salt in the mixed solution I is 4:1-6:1; Step (5): Filter, wash, crush, dry, and pass the mixed solution III through a 40-mesh sieve to obtain an oxygen storage material for cigarette paper.

2. The method for preparing the oxygen storage material for cigarette paper according to claim 1, characterized in that: The activation treatment in step (2) is specifically as follows: At least one of the molecular sieve, zeolite, alkali-resistant MOF and alkaline ZIF is dried and crushed, passed through a 40-mesh sieve, and then dried for 2-4 hours.

3. The method for preparing the oxygen storage material for cigarette paper according to claim 1, characterized in that: The stirring time in step (3) is 4-6 hours.

4. The method for preparing an oxygen storage material for cigarette paper according to claim 1, characterized in that: The stirring time in step (4) is 2-3 hours.

5. The method for preparing the oxygen storage material for cigarette paper according to claim 1, characterized in that: The drying conditions in step (5) are as follows: Dry in vacuum at 100°C for 1-2h.

6. An oxygen storage material for cigarette paper, characterized in that: The oxygen storage material is prepared by the method for preparing the oxygen storage material for cigarette paper according to any one of claims 1 to 5.

7. An application of the oxygen storage material for cigarette paper as claimed in claim 6, characterized in that: Under stirring conditions, the oxygen storage material for cigarette paper is added in batches to the polyethylene glycol functionalized with citric acid to obtain a mixed solution IV, and then the mixed solution IV is made into a sizing solution and applied to the surface of a substrate or cigarette paper, wherein the mass ratio of the oxygen storage material for cigarette paper to the polyethylene glycol functionalized with citric acid is 1:2-1:

5.

8. The use of the oxygen storage material for cigarette paper according to claim 7, characterized in that: The preparation method of the sizing solution is as follows: The mixed solution IV is added to the modified starch solution to form a sizing solution, wherein the concentration of the modified starch solution is 0.5-2.0wt%, and the mass ratio of the mixed solution IV to the modified starch solution is 1:3-1:

8.

9. The use of the oxygen storage material for cigarette paper according to claim 7, characterized in that: The gluing process is as follows: The sizing solution is sprayed on the cigarette paper by an offline coating machine, and then dried by a drying cylinder with the drying cylinder temperature controlled at 90-120°C, followed by slitting, wherein the amount of oxygen storage material applied to the cigarette paper is 1.5-5.0% of the weight of the cigarette paper.

Images