Preparation method of anti-permeation moisture-retaining cigarette paper and product of anti-permeation moisture-retaining cigarette paper

Abstract

The invention relates to a preparation method of impermeable moisture-retaining cigarette paper and a product thereof, and the preparation method comprises the following steps: firstly, carrying out plasma treatment on the inner surface of basic cigarette paper, and activating the inner surface of the cigarette paper; and depositing an inorganic film barrier layer on the inner surface of the basic cigarette paper in an atomic layer deposition manner to obtain the anti-permeation moisture-retaining cigarette paper, wherein the inner surface of the basic cigarette paper is in contact with tobacco shreds. A compact oxide inorganic film barrier layer is creatively formed on the inner surface of the cigarette paper in an atomic layer deposition mode, no adhesive needs to be added, good uniformity and shape retention are achieved, and good water retention and permeation prevention effects can be achieved only by depositing a thin barrier layer; and when the cigarette is ignited, the deposited barrier coating does not participate in fiber combustion in the cigarette paper and can be left on the surface of cigarette ash, so that the harm to a human body is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of cigarette paper preparation, and in particular to a preparation method of anti-penetration and moisture-retaining cigarette paper, and a product and application thereof. Background Art

[0002] With the improvement of people's living standards and the upgrading of consumption in the cigarette market, consumers' requirements for cigarette quality are also increasing. However, traditional Chinese cigarettes generally face the challenges of fast moisture loss and poor water holding capacity of tobacco. The reduction of moisture content will seriously affect its sensory characteristics, resulting in increased dryness and irritation of smoke, less clean aftertaste, and decreased sweetness. In addition, due to the influence of various factors such as regional differences, seasonal changes, storage time and shelf life, the moisture content of cigarettes will fluctuate greatly, thereby reducing the stability of cigarette quality. Therefore, cigarette moisture preservation has always been one of the important areas of tobacco research.

[0003] At present, the moisturizing of cigarettes mainly depends on the addition of humectants, such as propylene glycol, glycerin and sorbitol. However, studies have shown that during the smoking process of cigarettes, some humectants may migrate into the smoke to form tar, which will affect the sensory experience of cigarettes to a certain extent. At the same time, with the development of low-tar and low-harm cigarettes, the lack of aroma of cigarettes and the decline in smoking comfort make the application of flavors and fragrances in low-tar cigarettes particularly critical. But as time goes by, the ingredients of flavors and fragrances easily penetrate into the cigarette paper, forming colored oil spots, which affects the appearance experience of the cigarette.

[0004] Based on the above problems, it is particularly important to develop a cigarette paper with anti-permeability and moisturizing functions, which is also a key direction for the research and development of functional cigarette paper. In addition to adding moisturizing agents, organic coating agents are also commonly used in the current anti-permeability and moisturizing methods, but the above methods are easy to affect the sensory experience of cigarettes and may increase the release of harmful smoke, which is not conducive to human health. CN114960269A discloses an anti-permeability aluminum foil cigarette paper, including a paper layer and an aluminum foil layer arranged on either side of the paper layer. The method for setting the aluminum foil layer is to plate the molten aluminum wire on the surface of the paper layer through a transfer film surface aluminum plating process. The thickness of the obtained anti-permeability aluminum foil cigarette paper is 0.03-0.9mm, and the thickness ratio of the paper layer to the aluminum foil layer is (2-25): 1. It has good anti-permeability and moisture resistance, and can prevent the flavors and spices in the cigarette from penetrating into the outside of the anti-permeability aluminum foil cigarette. CN117867892A discloses a heat-not-burn cigarette paper with aluminum ion coating, the ion coating is sprayed by magnetron sputtering, radio frequency sputtering, reactive sputtering, multi-arc ion or reactive reaction evaporation, and the thickness of the ion coating is 1-10 μm. However, the cigarette paper disclosed in the above two patents can only be used for heating cigarettes and cannot be used in traditional burning cigarettes because the thickness of the metal film is too thick.

[0005] The present invention aims to overcome the deficiencies of the prior art and provide a new anti-permeation and moisture-retaining cigarette paper to meet the market demand for high-quality cigarette paper. Summary of the invention

[0006] In view of the deficiencies of the prior art, the object of the present invention is to provide a method for preparing anti-permeation and moisture-retaining cigarette paper and a product thereof.

[0007] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a method for preparing an anti-permeation and moisture-retaining cigarette paper, the method comprising the following steps:

[0009] (1) performing plasma treatment on the inner surface of the base cigarette paper to activate the inner surface of the cigarette paper;

[0010] (2) depositing an inorganic thin film barrier layer on the inner surface of the base cigarette paper by atomic layer deposition to obtain the anti-permeation and moisture-retaining cigarette paper;

[0011] Wherein, the inner surface of the base cigarette paper is the side in contact with the tobacco shreds.

[0012] The present invention creatively adopts the method of atomic layer deposition to form a dense oxide inorganic thin film barrier layer on the inner surface of cigarette paper, without adding any adhesive, which can reduce the influence of adhesive on the smoking sensation of cigarette; it has good uniformity and shape retention, and only needs to deposit a very thin barrier layer to achieve good water retention and anti-penetration effects; it will not affect the combustion of cigarette paper. When the cigarette is ignited, the deposited barrier coating will not participate in the combustion of fibers in the cigarette paper, but will remain on the surface of the ash and will not cause harm to the human body.

[0013] Preferably, the plasma generating gas in the plasma treatment in step (1) includes oxygen or argon.

[0014] Preferably, the flow rate of the oxygen plasma generating gas is 8-12 sccm, for example, 8 sccm, 9 sccm, 10 sccm, 11 sccm, 12 sccm, etc. Any other specific point value within this numerical range can be selected and will not be described in detail here.

[0015] Preferably, the oxygen plasma treatment time is 8-12 min, for example, 8 min, 9 min, 10 min, 11 min, 12 min, etc. Any other specific point value within this numerical range can be selected, which will not be described here one by one.

[0016] Preferably, the voltage of the plasma treatment is 20-30V, for example 20V, 21V, 22V, 23V, 24V, 25V, 26V, 27V, 28V, 29V, 30V, etc. Any other specific point value within this numerical range can be selected, which will not be described here one by one.

[0017] Preferably, the first precursor of the atomic layer deposition in step (2) is trimethylaluminum, and the second precursor is oxygen plasma.

[0018] Preferably, the introduction time of the first precursor is greater than 0.6 s, for example 0.6 s, 0.7 s, 0.8 s, 0.9 s, 1.0 s, etc. Any other specific point value within this numerical range can be selected, which will not be described here one by one.

[0019] Preferably, the purging time of the first precursor is more than 15 s, for example 15 s, 16 s, 17 s, 18 s, 19 s, 20 s, etc. Any other specific point value within the numerical range can be selected, which will not be described here one by one.

[0020] Preferably, the introduction time of the second precursor is more than 8s, for example 8s, 9s, 10s, 11s, 12s, etc. Any other specific point value within this numerical range can be selected, which will not be described here one by one.

[0021] Preferably, the body purge time of the second precursor is more than 30s, for example 30s, 31s, 32s, 33s, 34s, 35s, etc. Any other specific point value within this numerical range can be selected, which will not be described here one by one.

[0022] Preferably, the second precursor is generated from argon and oxygen through dielectric barrier discharge.

[0023] Preferably, the discharge gap is 0.5-1.5mm (for example, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, etc.), the voltage of the voltage regulator is 20-30v (for example, 20v, 21v, 22v, 23v, 24v, 25v, 26v, 27v, 28v, 29v, 30v, etc.), and any other specific point value within the above numerical range can be selected, which will not be repeated here.

[0024] Preferably, the flow rate of the argon gas is 580-620sccm (for example, 580sccm, 590sccm, 600sccm, 610sccm, 620sccm, etc.), and the flow rate of the oxygen gas is 5-15sccm (for example, 5sccm, 6sccm, 7sccm, 8sccm, 9sccm, 10sccm, 11sccm, 12sccm, 13sccm, 14sccm, 15sccm, etc.), and any other specific point value within the above numerical range can be selected, which will not be elaborated here one by one.

[0025] Preferably, the deposition period of the atomic layer deposition is 85-260, for example, 85, 90, 95, 100, 105, 110, 115, 120, 130, 140, 150, 160, 170, 180, 190, 200, 220, 240, 260, etc. Any other specific point value within this numerical range can be selected, and they will not be described one by one here.

[0026] Preferably, the inorganic thin film barrier layer in step (2) is an Al2O3 thin film.

[0027] Preferably, the thickness of the organic thin film barrier layer is 20-60nm, for example, 20nm, 22nm, 25nm, 30nm, 32nm, 35nm, 37nm, 40nm, 42nm, 45nm, 48nm, 50nm, 52nm, 55nm, 58nm, 60nm, etc. Any other specific point value within this numerical range can be selected, and they will not be described here one by one.

[0028] In a second aspect, the present invention provides an anti-permeation and moisture-retaining cigarette paper prepared by the preparation method according to any one of the first aspects.

[0029] Preferably, the basis weight of the cigarette paper is 20-40 g / m 2 (e.g. 20g / m 2 , 22g / m 2 , 24g / m 2 , 26g / m 2 , 28g / m 2 , 30g / m 2 , 32g / m 2 , 34g / m 2 , 36g / m 2 , 38g / m 2 , 40g / m 2The thickness is 30-100μm (30μm, 35μm, 40μm, 45μm, 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 90μm, 100μm, etc.), the air permeability is 40-100CU (for example, 40CU, 45CU, 50CU, 55CU, 60CU, 65CU, 70CU, 75CU, 80CU, 85CU, 90CU, 95CU, 100CU, etc.), and any other specific point value within the above numerical range can be selected, which will not be described here one by one.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention creatively adopts the method of atomic layer deposition to form a dense oxide inorganic thin film barrier layer on the inner surface of cigarette paper, without adding any adhesive, which can reduce the influence of adhesive on the smoking sensation of cigarette; it has good uniformity and shape retention, and only needs to deposit a very thin barrier layer to achieve good water retention and anti-penetration effects; it will not affect the combustion of cigarette paper. When the cigarette is ignited, the deposited barrier coating will not participate in the combustion of fibers in the cigarette paper, but will remain on the surface of the ash and will not cause harm to the human body. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 1 is a schematic diagram of the structure of the cigarette paper prepared in Example 1, 1 is the base cigarette paper, and 2 is the inorganic film barrier layer. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0034] In the following examples, unless otherwise specified, the reagents and consumables used were purchased from conventional reagent manufacturers in the field; unless otherwise specified, the experimental methods and technical means used were conventional methods and means in the field.

[0035] Preparation Example

[0036] This preparation example provides a basic cigarette paper, and the preparation method is as follows:

[0037] According to the cigarette paper making method, the basis weight is 27g / m 2 , basic cigarette paper with an air permeability of 100CU.

[0038] Cigarette paper preparation method: using hemp pulp and wood pulp as pulp raw materials (65%), calcium carbonate as filler (32%), guar gum as retention aid (2%), potassium citrate and sodium citrate as combustion regulator (1%), and preparing a quantitative 27g / m2 , basic cigarette paper with an air permeability of 100CU.

[0039] Example 1

[0040] This embodiment provides an anti-permeation and moisture-retaining cigarette paper, and the preparation method is as follows:

[0041] (1) Plasma treatment of the basic cigarette paper prepared in the preparation example:

[0042] The basic cigarette paper prepared in Preparation Example 1 was placed in a chamber, oxygen was used as a plasma source, the oxygen flow rate was set to 10 sccm, the voltage of the voltage regulator was 25 V, and the treatment was performed for 10 minutes to obtain cigarette paper with an activated inner surface.

[0043] (2) using a mixture of argon and oxygen as a plasma source, generating a second precursor oxygen plasma by dielectric barrier discharge, with a discharge gap of 1 mm, an argon flow rate of 600 sccm, an oxygen flow rate of 10 sccm, and a voltage regulator of 25 V;

[0044] Place the activated cigarette paper in the chamber, evacuate the chamber, and preheat the chamber to 65°C. Then adjust the chamber pressure to Open mode, and the chamber background pressure is 10Pa. Introduce trimethylaluminum into the chamber for 0.6s and 15s, then introduce oxygen plasma into the chamber for 8s and 30s, as a cycle to deposit Al2O3 film. Deposit 160 cycles to obtain an impermeable and moisturizing cigarette paper with an Al2O3 film thickness of 37.5±2nm.

[0045] Example 2

[0046] This embodiment provides an anti-permeation and moisture-retaining cigarette paper, and the preparation method is as follows:

[0047] (1) Plasma treatment of the basic cigarette paper prepared in the preparation example:

[0048] The basic cigarette paper prepared in Preparation Example 1 was placed in a chamber, oxygen was used as a plasma source, the oxygen flow rate was set to 8 sccm, the voltage of the voltage regulator was 27 V, and the treatment was performed for 12 minutes to obtain cigarette paper with an activated inner surface.

[0049] (2) Using a mixed gas of argon and oxygen as a plasma source, a second precursor oxygen plasma is generated by dielectric barrier discharge, the discharge gap is 1.2 mm, the argon flow rate is 580 sccm, the oxygen flow rate is 15 sccm, and the voltage regulator voltage is 28 V;

[0050] Place the activated cigarette paper in the chamber, evacuate the chamber, and preheat the chamber to 65°C. Then adjust the chamber pressure to Open mode, and the chamber background pressure is 10Pa. Introduce trimethylaluminum into the chamber for 0.8s and 17s; introduce oxygen plasma into the chamber for 9s and 33s, as a cycle to deposit Al2O3 film. Deposit 240 cycles to obtain an impermeable and moisturizing cigarette paper with an Al2O3 film thickness of 60±1nm.

[0051] Example 3

[0052] This embodiment provides an anti-permeation and moisture-retaining cigarette paper, and the preparation method is as follows:

[0053] (1) Plasma treatment of the basic cigarette paper prepared in the preparation example:

[0054] The basic cigarette paper prepared in Preparation Example 1 was placed in a chamber, argon was used as a plasma source, the argon flow rate was set to 12 sccm, the voltage of the voltage regulator was 23 V, and the treatment was performed for 8 minutes to obtain cigarette paper with an activated inner surface.

[0055] (2) Using a mixed gas of argon and oxygen as a plasma source, a second precursor oxygen plasma is generated by dielectric barrier discharge, the discharge gap is 0.8 mm, the argon flow rate is 620 sccm, the oxygen flow rate is 5 sccm, and the voltage regulator voltage is 23 V;

[0056] Place the activated cigarette paper in the chamber, evacuate the chamber, and preheat the chamber to 65°C. Then adjust the chamber pressure to the Open mode, and the chamber background pressure is 10Pa. Introduce trimethylaluminum into the chamber for 1.0s and 20s; introduce oxygen plasma into the chamber for 10s and 35s, and deposit Al2O3 film as a cycle. Deposit 90 cycles to obtain an anti-permeation and moisturizing cigarette paper with an Al2O3 film thickness of 20±1nm.

[0057] Example 4

[0058] This embodiment provides an anti-permeation and moisture-retaining cigarette paper, which differs from Embodiment 1 only in that the deposition cycle in step (2) is 40, the thickness of the Al2O3 film is 10±1 nm, and other conditions remain unchanged.

[0059] Example 5

[0060] This embodiment provides an anti-permeation and moisture-retaining cigarette paper, which differs from Embodiment 1 only in that the deposition cycle in step (2) is 400, the thickness of the Al2O3 film is 93±0.5 nm, and other conditions remain unchanged.

[0061] Example 6

[0062] This embodiment provides an anti-permeation and moisture-retaining cigarette paper, which is different from the embodiment 1 only in that the introduction time of trimethylaluminum in step (2) is 0.3 s, and other conditions remain unchanged.

[0063] Example 7

[0064] This embodiment provides an anti-permeation and moisture-retaining cigarette paper, which is different from Embodiment 1 only in that the purge time of trimethylaluminum in step (2) is 10 seconds, and other conditions remain unchanged.

[0065] Example 8

[0066] This embodiment provides an anti-permeation and moisture-retaining cigarette paper, which is different from the embodiment 1 only in that the oxygen plasma is introduced for 5 seconds in step (2), and other conditions remain unchanged.

[0067] Example 9

[0068] This embodiment provides an anti-permeation and moisture-retaining cigarette paper, which is different from Embodiment 1 only in that the oxygen plasma purge time in step (2) is 25 seconds, and other conditions remain unchanged.

[0069] Comparative Example 1

[0070] This comparative example provides a cigarette paper, which differs from Example 1 only in that in step (2), metal aluminum is selected as the inner surface coating of the cigarette paper, and an active reaction evaporation ion plating process is used to perform ion plating on the inner surface of the cigarette paper, and the thickness of the ion plating is 10 μm.

[0071] Comparative Example 2

[0072] This comparative example provides a cigarette paper, which differs from Example 1 only in that in step (2), metal aluminum is selected as the inner surface coating of the cigarette paper, and ion coating is performed on the inner surface of the cigarette paper by using a radio frequency sputtering ion coating process, and the thickness of the ion coating is 5 μm.

[0073] Test Example 1

[0074] In this test example, the air permeability, oil resistance level and vapor transmission rate of the cigarette papers prepared in Examples 1-9 and Comparative Examples 1-2 were tested, and the basic cigarette paper obtained in the preparation example was used as a blank group. The results are shown in Table 1:

[0075] (1) The air permeability of cigarette paper is tested according to GB / T 23227-2018;

[0076] (2) The oil resistance level is tested according to GB / T 22805.2-2008 standard;

[0077] (3) Moisture permeability: The water vapor permeability of cigarette paper was tested using a moisture permeability tester (TSY-T1H) at 38°C ± 1°C and 90 ± 2% RH.

[0078] Table 1

[0079]

[0080]

[0081] It can be seen from the data in Table 1 that the oil resistance level of the cigarette paper prepared by the preparation method of the present invention is improved by more than 8 and the water vapor transmission rate is reduced by more than 1180g / m 2 24h, greatly improving the anti-grease penetration and water vapor barrier effects of cigarette paper, while maintaining a high air permeability without affecting the burning of cigarette paper.

[0082] Comparing Example 1 with Examples 4-5, it can be seen that when the thickness of the inorganic thin film barrier layer is within a specific range, better anti-grease penetration effect and water vapor barrier effect can be obtained, and too thick or too thin will affect the water vapor permeability.

[0083] By comparing Example 1 with Examples 6-9, it can be seen that the introduction time and the purge time of the first precursor and the second precursor during the atomic layer deposition process will also affect the anti-grease penetration effect and water vapor barrier effect of the prepared cigarette paper.

[0084] Comparative Example 1 and Comparative Example 2 respectively adopt active reaction evaporation ion plating process and radio frequency sputtering ion plating process. The plated ion films are very thick, resulting in an air permeability of 0 CU, and therefore cannot be used in burning cigarettes.

[0085] Test Example 2

[0086] This test case tests the moisture retention performance of cigarette paper:

[0087] The cigarette papers prepared in Examples 1-9 were prepared into cigarettes and placed under low humidity conditions (temperature 22±1°C and humidity 40±2%) and high humidity conditions (temperature 22±1°C and humidity 70±2%), respectively. The moisture content of the cigarettes was measured after 240 hours. A blank group was also set up. Cigarettes were prepared using basic cigarette paper. The results are shown in Table 2.

[0088] Table 2

[0089] Group High humidity environment moisture content (%) Moisture content in low humidity environment (%) Example 1 14.9 12.8 Example 2 14.4 12.4 Example 3 13.8 11.7 Example 4 12.5 10.8 Example 5 12.9 10.5 Example 6 12.8 9.7 Example 7 13.6 11.1 Example 8 12.5 10.3 Example 9 12.9 10.9 Blank Group 11.5 10.2

[0090] It can be seen from the data in Table 2 that the cigarette paper prepared by the preparation method of the present invention has a good moisturizing effect in both low-humidity and high-humidity environments.

[0091] Comparing Example 1 with Examples 4-5, it can be seen that when the thickness of the inorganic thin film barrier layer is within a specific range, a better moisture retention effect can be obtained.

[0092] By comparing Example 1 with Examples 6-9, it can be seen that the introduction time of the first precursor and the purge time of the second precursor during the atomic layer deposition process will also affect the moisturizing effect of the prepared cigarette paper.

[0093] Test Example 3

[0094] In this test example, a sensory evaluation was conducted on cigarettes prepared from the cigarette papers prepared in Examples 1-9, and a blank group was set up. Cigarettes were prepared using basic cigarette papers. Seven smoking evaluation experts conducted a sensory evaluation of the cigarettes according to the standard of "GB 5606.4-2005 Cigarettes Part 4: Sensory Technical Requirements". The results were averaged. The sensory evaluation results are shown in Table 3.

[0095] Table 3

[0096] Group luster aroma coordination Miscellaneous gas Irritant Aftertaste Total score Example 1 5 28.6 5.0 10.3 18.3 21.7 88.9 Example 2 5 28.1 4.8 9.8 17.5 21.0 86.2 Example 3 5 27.8 4.9 10.1 17.6 21.3 86.7 Example 4 5 27.4 4.5 9.8 17.4 21.1 85.2 Example 5 5 26.8 4.3 9.0 17.0 19.8 81.9 Example 6 5 27.5 4.6 9.5 17.3 21.2 85.1 Example 7 5 27.6 4.7 10.1 17.6 21.3 86.3 Example 8 5 27.4 4.6 9.7 17.3 21.3 85.3 Example 9 5 27.4 4.7 10.0 17.7 20.8 85.6 Blank Group 5 27.0 4.5 9.4 16.9 20.3 83.1

[0097] It can be seen from the data in Table 3 that the cigarette paper prepared by the preparation method of the present invention has a good water vapor barrier effect and excellent water retention. Therefore, the prepared cigarette has the least irritation and the highest comprehensive sensory score.

[0098] Comparing Example 1 with Examples 4-5, it can be seen that when the thickness of the inorganic thin film barrier layer is within a specific range, a better comprehensive sensory score of the cigarette can be obtained.

[0099] By comparing Example 1 with Examples 6-9, it can be seen that the introduction time of the first precursor and the purge time of the second precursor during the atomic layer deposition process also affect the comprehensive sensory score of the prepared cigarette.

[0100] The applicant declares that the present invention illustrates the technical solution of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned embodiments, that is, it does not mean that the present invention must rely on the above-mentioned embodiments to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

[0101] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0102] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

Claims

1. A method for preparing anti-permeation and moisture-retaining cigarette paper, characterized in that: The preparation method comprises the following steps: (1) performing plasma treatment on the inner surface of the base cigarette paper to activate the inner surface of the cigarette paper; (2) depositing an inorganic thin film barrier layer on the inner surface of the base cigarette paper by atomic layer deposition to obtain the anti-permeation and moisture-retaining cigarette paper; Wherein, the inner surface of the base cigarette paper is the side in contact with the tobacco shreds.

2. The method for preparing the anti-permeation and moisture-retaining cigarette paper according to claim 1, characterized in that: The plasma generating gas in the plasma treatment of step (1) includes oxygen or argon; Preferably, the flow rate of the oxygen plasma generating gas is 8-12 sccm; Preferably, the oxygen plasma treatment time is 8-12 min; Preferably, the voltage of the plasma treatment is 20-30V.

3. The method for preparing the anti-permeation and moisture-retaining cigarette paper according to claim 1 or 2, characterized in that: The first precursor of the atomic layer deposition in step (2) is trimethylaluminum, and the second precursor is oxygen plasma.

4. The method for preparing the anti-permeation and moisture-retaining cigarette paper according to claim 3, characterized in that: The first precursor is introduced for a time of more than 0.6 s; Preferably, the purge time of the first precursor is more than 15 s.

5. The method for preparing the anti-permeation and moisture-retaining cigarette paper according to claim 3 or 4, characterized in that: Preferably, the introduction time of the second precursor is more than 8s; Preferably, the body purge time of the second precursor is more than 30 seconds.

6. The method for preparing the anti-permeation and moisture-retaining cigarette paper according to any one of claims 3 to 5, characterized in that: The second precursor is generated by argon and oxygen through dielectric barrier discharge; Preferably, the discharge gap is 0.5-1.5 mm, and the voltage of the voltage regulator is 20-30 V; Preferably, the flow rate of the argon gas is 580-620 sccm, and the flow rate of the oxygen gas is 5-15 sccm.

7. The method for preparing the anti-permeation and moisture-retaining cigarette paper according to any one of claims 1 to 6, characterized in that: The deposition cycle of the atomic layer deposition is 85-260.

8. The method for preparing the anti-permeation and moisture-retaining cigarette paper according to any one of claims 1 to 7, characterized in that: The inorganic thin film barrier layer in step (2) is an Al2O3 thin film; Preferably, the thickness of the organic thin film barrier layer is 20-60 nm.

9. The anti-permeation and moisture-retaining cigarette paper prepared according to the preparation method according to any one of claims 1 to 8.

10. The anti-permeation and moisture-retaining cigarette paper according to claim 9, characterized in that: The basis weight of the anti-permeation and moisture-retaining cigarette paper is 20-40 g / m 2 , thickness is 30-100μm, and air permeability is 40-80CU.

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