Printing ink and application thereof in tipping paper for heating cigarettes

Abstract

The invention discloses printing ink and application thereof in tipping paper for heating cigarettes, and belongs to the field of tobacco products. The printing ink comprises polyvinyl butyral resin, a filler, an auxiliary agent and a solvent, the ink is good in thermal stability, the tipping paper for heating the cigarettes prepared from the ink is used for heating the cigarettes, no peculiar smell of the ink is generated in the smoking process of the heated cigarettes, the influence on the sensory quality of the heated cigarettes is reduced, and the ink has relatively high industrial availability, high safety and low cost and is applied to the production of the heated cigarettes.

Description

Technical Field

[0001] This invention relates to an ink, particularly to an ink specifically for tipping paper in heated cigarettes, and also to the application of the ink, belonging to the field of tobacco products. Background Technology

[0002] Unlike traditional cigarettes that produce smoke from burning tobacco materials, heated cigarettes generate aerosols by heating the tobacco materials. Because the temperature of the tobacco core material is lowered by heating, the harmful components produced by the high-temperature combustion and decomposition of tobacco are significantly reduced. The amount of flue gas and ambient smoke is also greatly reduced, thus lowering the harm of tobacco products to human health. It is gradually becoming a hot topic in tobacco product research and development both domestically and internationally.

[0003] Similar to traditional cigarettes, heated cigarettes also require tipping paper. However, unlike traditional cigarettes, a portion of the tipping paper in heated cigarettes is inserted into the heating device along with the cigarette. During inhalation, this portion of the tipping paper is heated, causing the ink layer on the paper to evaporate or decompose. The resulting products enter the mouth along with the main smoke, producing an unpleasant odor. Currently, the heating and inhalation time for mainstream heated cigarette products both domestically and internationally is concentrated between 3 and 5 minutes, and the temperature of the tipping paper surrounding the heated cigarette is around 250°C. Therefore, developing an ink that produces no odor during the inhalation of heated cigarettes is of great significance for improving the sensory quality of heated cigarettes. Summary of the Invention

[0004] In view of the technical defects of existing inks for heated cigarette tipping paper, which are prone to volatilization or pyrolysis during the smoking process of heated cigarettes, resulting in off-odors and affecting sensory quality, the first objective of this invention is to provide an ink that meets the requirements for use in heated cigarette tipping paper and can withstand temperatures of 50 to 250°C without producing off-odors within this temperature range, thereby reducing the impact on the sensory quality of heated cigarettes.

[0005] The second objective of this invention is to provide an application of an ink in which the heating cigarette tipping paper prepared using the ink can reduce the off-odors generated during the smoking process of heating cigarettes due to ink volatilization or pyrolysis, thereby reducing the impact on the sensory quality of heating cigarettes.

[0006] To achieve the above-mentioned technical objectives, the present invention provides an ink comprising polyvinyl butyral resin (PVB), fillers, additives, and solvents; wherein the viscosity of the polyvinyl butyral resin is 2 to 10 seconds as tested by the Zahn cup viscometer method in GB / T13217.4-2020 standard.

[0007] The key to this invention lies in using polyvinyl butyral resin with a specific viscosity as the base resin for the ink. Extensive experiments have shown that at the highest possible temperature of 250°C for heated cigarette tipping paper, the higher the viscosity of polyvinyl butyral, the more decomposition products are produced at the same temperature, leading to more likely off-odors and affecting the sensory quality of the heated cigarette. If the viscosity of the PVB used is less than 2 seconds, its molecular weight is too low, making it difficult to meet the requirements for ink use. Conversely, if the viscosity of PVB is greater than 10 seconds, such as reaching 15 seconds, its decomposition products at 250°C increase significantly. Therefore, the preferred PVB viscosity is between 2 and 10 seconds, which satisfies the application requirements of the ink while minimizing the impact on the sensory quality of the heated cigarette.

[0008] As a preferred embodiment, the additives include at least one of abrasion resistant agents, dispersants, wetting agents, leveling agents, and defoamers. These additives are commonly used in inks. For the specific application environment of inks used in heated cigarette tipping paper, low-volatility additives can be selected; for example, the dispersant may include polyacrylate. The abrasion resistant agent may include polyethylene. The wetting agent may include at least one of organosilicon derivatives and acetylenic diol derivatives. The leveling agent may include at least one of acrylate derivatives and organosilicon derivatives. The defoamer may include at least one of organosilicon derivatives and mineral oils.

[0009] As a preferred embodiment, the filler includes at least one of light calcium carbonate, silica, kaolin, talc, barium sulfate, magnesium oxide, and titanium dioxide.

[0010] As a preferred embodiment, the solvent includes at least one of water, ethanol, and n-butanol.

[0011] As a preferred embodiment, the ink comprises the following components in parts by weight: 10-20 parts of polyvinyl butyral resin; 10-40 parts of filler; 1-5 parts of additives; and 20-55 parts of solvent.

[0012] As a preferred embodiment, the ink comprises a cellulose resin. As a more preferred embodiment, the cellulose resin includes cellulose acetate butyrate and / or ethyl cellulose. As a more preferred embodiment, the cellulose resin comprises no more than 10 parts by weight. Cellulose resin is also a low-volatile resin and is relatively inexpensive, making it suitable for use in ink formulations. However, its dispersion and encapsulation properties are inferior to PVB resin fillers and pigments, affecting whiteness, and it has higher requirements for solvents. Therefore, its usage should not be too high, and should not exceed 50% of the mass of polyvinyl butyral resin.

[0013] The present invention also provides an application of the ink for preparing tipping paper for heated cigarettes.

[0014] The ink application process of this invention: The ink is applied using conventional industry-standard preparation processes to produce tipping paper. For example, it is coated onto the surface of heated cigarette tipping paper using a coating method.

[0015] The preparation method of the ink of the present invention is as follows: after mixing the filler, polyvinyl butyral (or polyvinyl butyral and cellulose resin) and solvent, the mixture is stirred at a speed of 100-300 r / s for 10-30 min to obtain the finished ink.

[0016] Compared with the prior art, the technical solution of the present invention brings the following beneficial technical effects:

[0017] The ink provided by this invention meets the requirements for use in heated cigarette tipping paper, can withstand temperatures of 50 to 250°C, and produces no off-odors within this temperature range and during the smoking time of heated cigarettes, thereby reducing the impact on the sensory quality of heated cigarettes. It can effectively solve the technical problems existing in inks for heated cigarette tipping paper. Attached Figure Description

[0018] To make the content of this invention easier to understand, the following detailed description of the invention, based on specific embodiments and in conjunction with the accompanying drawings, is provided, wherein:

[0019] Figures 1-5 Thermogravimetric analysis results of commonly used resins in cigarette inks with PVB-10 seconds (tested according to the Zahn cup viscometer method in GB / T13217.4-2020 standard, abbreviated as PVB-10 seconds): Figure 1 It is an aldehyde-ketone resin. Figure 2 For PVB-10 seconds, Figure 3 It is cellulose acetate butyrate resin. Figure 4 It is an acrylic resin. Figure 5 The sample is rosin resin. Thermogravimetric analysis results show that the contact temperature of the heated cigarette tipping paper is around 250℃, and PVB-10 seconds and cellulose acetate butyrate resin exhibit good thermal stability. The thermogravimetric analysis conditions were as follows: a certain amount of sample (approximately 10 mg) was placed inside an alumina crucible, and a programmed temperature rise was performed: initial temperature 35℃, heating rate 10℃·min. -1 The termination temperature is 400℃, the purging gas is air, and the flow rate is 20 mL / min. -1 . Figures 6-10 The results of the thermal decomposition test of PVB-10, a resin commonly used in cigarette inks, at 250℃ are presented. Figure 6 It is an aldehyde-ketone resin. Figure 7 For PVB-10 seconds, Figure 8 It is cellulose acetate butyrate resin. Figure 9 It is an acrylic resin. Figure 10The resin used was rosin. Table 1 summarizes the corresponding pyrolysis products. The pyrolysis results show that PVB-10 and cellulose acetate butyrate resins exhibited better thermal stability, releasing significantly fewer pyrolysis products. The pyrolysis analysis conditions were: probe initial temperature 50℃, automatic temperature ramping for 12 seconds, and atmospheric pyrolysis atmosphere. GC-MS conditions: HP-INNOWAX capillary column (60m × 0.25mm × 0.25μm), column oven temperature 90℃, injection port temperature 250℃, carrier gas He, total flow rate 57.0 mL·min. -1 Column flow rate 1.0 mL·min -1 The split ratio is 50:1; the temperature gradient is as follows: initial temperature 90℃, held for 5 min, then increased at 10℃·min. -1 The heating rate reached 250℃ and was held for 10 min. The ion source was an EI source with a mass scan range of 33–400 amu; the standard spectral libraries were NIST98 and WILEY275.

[0020] Figures 11-13 The results of thermal decomposition measurements of PVB-2 seconds, PVB-8 seconds, and PVB-15 seconds at 250℃ are shown in sequence. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments. It should be understood that the specific embodiments described herein are merely illustrative and do not limit the scope of the invention.

[0022] Unless otherwise specified, the raw materials used in the following specific embodiments are all conventional commercial raw materials.

[0023] Example 1

[0024] 30 parts by weight of filler light calcium carbonate, 1 part of wetting agent (TEG0550), 1 part of leveling agent (BYK302), 0.5 parts of defoamer (BYK024), 1 part of abrasion resistant agent (polyethylene), 1.5 parts of dispersant (polyacrylate), 15 parts of polyvinyl butyral (2 seconds), 25 parts of ethanol, and 25 parts of ethyl acetate were mixed and stirred at 100 r / s for 10 min to obtain the finished ink. The finished ink prepared above was coated on heated cigarette tipping paper, specifically using anti-permeability tipping paper base paper as the substrate, with a basis weight of 35 g / m². 2 The gravure printing speed was controlled at 100 m / min for coating, the printing pressure was 0.2 MPa, and the coating surface density was 1.0 g / m³. 2 The cigarettes were dried at 70℃ and then further prepared using conventional methods to produce heated cigarettes. Sensory quality evaluation was conducted, and the results are shown in Table 2.

[0025] Example 2

[0026] 30 parts by weight of filler light calcium, 1 part of wetting agent (TEG0550), 2 parts of leveling agent (BYK302), 2 parts of defoamer (BYK024), 10 parts of polyvinyl butyral (10 seconds), 5 parts of cellulose acetate butyrate, and 50 parts of ethanol were mixed and stirred at 200 r / s for 20 min to obtain the finished ink. The finished ink prepared above was coated on heated cigarette tipping paper (see Example 1 for the coating process), and then heated cigarettes were prepared according to conventional methods. Sensory quality evaluation was performed, and the results are shown in Table 2.

[0027] Example 3

[0028] 25 parts of light calcium filler, 1 part of wetting agent (TEG0550), 2 parts of leveling agent (BYK302), 2 parts of defoamer (BYK024), 5 parts of polyvinyl butyral (8 seconds), 10 parts of cellulose acetate butyrate, 35 parts of ethanol, and 20 parts of ethyl acetate were mixed and stirred at 300 r / s for 15 min to obtain the finished ink. The finished ink prepared above was coated on heated cigarette tipping paper (see Example 1 for the coating process), and then heated cigarettes were prepared according to conventional methods. Sensory quality evaluation was performed, and the results are shown in Table 2.

[0029] Comparative Example 1

[0030] 30 parts by weight of filler light calcium, 1 part of wetting agent (TEG0550), 1 part of leveling agent (BYK302), 0.5 parts of defoamer (BYK024), 1 part of abrasion resistant agent (polyethylene), 1.5 parts of dispersant (polyacrylate), 15 parts of polyvinyl butyral (15 seconds), 25 parts of ethanol, and 25 parts of ethyl acetate were mixed and stirred at 100 r / s for 10 min to obtain the finished ink. The finished ink prepared above was coated on heated cigarette tipping paper (see Example 1 for the coating process), and then heated cigarettes were prepared according to conventional methods. Sensory quality evaluation was performed, and the results are shown in Table 2.

[0031] Comparative Example 2

[0032] 30 parts by weight of filler light calcium, 1 part of wetting agent (TEG0550), 1 part of leveling agent (BYK302), 0.5 parts of defoamer (BYK024), 1 part of abrasion resistant agent (polyethylene), 1.5 parts of dispersant (polyacrylate), 15 parts of aldehyde-ketone resin, 25 parts of ethanol, and 25 parts of ethyl acetate were mixed and stirred at 100 r / s for 10 min to obtain the finished ink. The finished ink prepared above was coated on heated cigarette tipping paper (see Example 1 for the coating process), and then heated cigarettes were prepared according to conventional methods. Sensory quality evaluation was performed, and the results are shown in Table 2.

[0033] Comparative Example 3

[0034] 30 parts by weight of filler light calcium, 1 part of wetting agent (TEG0550), 1 part of leveling agent (BYK302), 0.5 parts of defoamer (BYK024), 1 part of abrasion resistant agent (polyethylene), 1.5 parts of dispersant (polyacrylate), 15 parts of acrylic resin, 25 parts of ethanol, and 25 parts of ethyl acetate were mixed and stirred at 100 r / s for 10 min to obtain the finished ink. The finished ink prepared above was coated on heated cigarette tipping paper (see Example 1 for the coating process), and then heated cigarettes were prepared according to conventional methods. Sensory quality evaluation was performed, and the results are shown in Table 2.

[0035] Comparative Example 4

[0036] 30 parts by weight of filler light calcium, 1 part of wetting agent (TEG0550), 1 part of leveling agent (BYK302), 0.5 parts of defoamer (BYK024), 1 part of abrasion resistant agent (polyethylene), 1.5 parts of dispersant (polyacrylate), 15 parts of rosin resin, 25 parts of ethanol, and 25 parts of ethyl acetate were mixed and stirred at 100 r / s for 10 min to obtain the finished ink. The finished ink prepared above was coated on heated cigarette tipping paper (see Example 1 for the coating process), and then heated cigarettes were prepared according to conventional methods. Sensory quality evaluation was performed, and the results are shown in Table 2.

[0037] Table 1. Number of pyrolysis products of different resins at 250℃

[0038]

[0039] Table 2. Sensory quality evaluation results of heated cigarette tipping papers prepared with different inks in the examples and comparative examples for use in heated cigarettes.

[0040]

Claims

1. An ink, characterized in that: It contains polyvinyl butyral resin, fillers, additives, and solvents; The viscosity of the polyvinyl butyral resin, as tested by the Zahn cup viscometer method in GB / T13217.4-2020, is 2 to 10 seconds.

2. The ink according to claim 1, characterized in that: The additives include at least one of abrasion resistant agents, dispersants, wetting agents, leveling agents, and defoamers.

3. The ink according to claim 2, characterized in that: The dispersant includes polyacrylate; The wear-resistant agent includes polyethylene; The wetting agent includes at least one of organosilicon compounds and acetylenic diol derivatives. The leveling agent includes at least one of acrylates and silicones. The defoamer includes at least one of organosilicon and mineral oil.

4. The ink according to claim 1, characterized in that: The filler includes at least one of light calcium carbonate, silica, kaolin, talc, barium sulfate, magnesium oxide, and titanium dioxide.

5. The ink according to claim 1, characterized in that: The solvent includes at least one of water, ethanol, and n-butanol.

6. An ink according to any one of claims 1 to 5, characterized in that: It contains the following components by weight: 10-20 parts of polyvinyl butyral resin; 10-40 parts of filler; 1-5 parts of additives; and 20-55 parts of solvent.

7. The ink according to claim 6, characterized in that: It contains cellulose resin.

8. The ink according to claim 7, characterized in that: The cellulose resin includes cellulose acetate butyrate and / or ethyl cellulose.

9. The ink according to claim 7, characterized in that: The mass fraction of the cellulose resin shall not exceed 10 parts.

10. The application of the ink according to any one of claims 1 to 9, characterized in that: Used to prepare tipping paper for heated cigarettes.

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