Multiple color-changing pellet cores, and methods of making and using the same

Abstract

The application provides a multi-color-changing pill core, a preparation method and application thereof. The multi-color-changing pill core is composed of a pill core core layer, a plurality of pigment layers and an intermediate layer arranged between each pair of adjacent pigment layers. The color-changing temperature of the plurality of pigment layers gradually increases from outside to inside, and the color of the plurality of pigment layers gradually disappears from outside to inside, so that a plurality of colors are visually presented in sequence. Moreover, the intermediate layer can reduce color distortion caused by color superposition between adjacent pigment layers. The pill core core layer is prepared from low-thermal-conductivity material, polyvinylpyrrolidone and microcrystalline cellulose, so that the occurrence of color returning is delayed, and the strength, toughness and processing performance of the pill core core layer are improved. Therefore, the multi-color-changing pill core has the characteristics of multi-color-changing, low friability, high roundness and the like, and can meet different application and processing requirements of the cigarette filter rod, and can also meet different consumption habits, so as to improve the consumption experience of the cigarette.

Description

Technical Field

[0001] This invention relates to the field of functional materials for cigarette filter rods, specifically to a multi-color changing pellet core, its preparation method, and its application. Background Technology

[0002] With the development of the social economy and the continuous changes in people's lifestyles, cigarette consumption has gradually shown characteristics of diversification and specialization. In order to meet the diverse needs of consumers and enhance their consumption experience, cigarette filter rods with color-changing functions have emerged. For example, CN 115109320A discloses a color-changing granule for cigarettes, its preparation method and its uses. The main steps include mixing, extrusion molding, drying and sieving. By loading the color-changing granule for cigarettes into a transparent cavity filter rod, consumers can clearly feel the effect of the granule color changing with temperature, light or pH when smoking cigarettes, forming a unique type of special cigarette filter rod. Patent CN 107474960A discloses a production method for cigarette smoke-sensitive color-changing aroma-releasing particles. By using a uniform mixture of color-changing powder, binder, and main material, the color-changing aroma-releasing particles are guaranteed to have high mechanical strength. The color-changing aroma-releasing particles are effectively loaded with fragrance through atomization. During the smoking process, consumers can feel the color change of the color-changing particles as the smoke passes through, and at the same time, they can feel the released fragrance, giving consumers pleasure in both visual and gustatory aspects. At the same time, it can also effectively prevent the cigarette from being counterfeited.

[0003] Although existing technologies can produce cigarette filter rods with color-changing effects, the color-changing effect is usually limited to a single color change, that is, "colored" to "colorless" or "colorless" to "colored". However, there are few reports on technologies that can accurately achieve multiple color changes, such as "colored" to "colored", that is, from color 1 to color 2 or from color 1 to color 2 and then to color 3. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-color changing cigarette core and its preparation method, wherein the color of the cigarette core can undergo multiple color changes when the cigarette is smoked.

[0005] To achieve the above objectives, the present invention provides a multi-color changing pellet core, which has a core-shell structure and consists of a pellet core layer, multiple pigment layers and an intermediate layer disposed between each pair of adjacent pigment layers, wherein the surface of the pellet core layer is covered with the pigment layers.

[0006] The core layer of the pellet is composed of the following components in parts by weight: 94-96 parts of low thermal conductivity material, 1-5 parts of microcrystalline cellulose and 1-3 parts of polyvinylpyrrolidone, wherein the thermal conductivity of the low thermal conductivity material is less than 0.05 W / m*K.

[0007] The pigment layer includes a heat-decolorizing thermochromic pigment, and the color-changing temperature of the heat-decolorizing thermochromic pigment in the multiple pigment layers gradually decreases along the direction from the core layer outward.

[0008] The intermediate layer includes two pigment anti-corrosion sublayers and a fatty acid sublayer sandwiched between the two pigment anti-corrosion sublayers, and the melting point of the fatty acid sublayer is between the temperature change temperatures of the adjacent pigment layers.

[0009] If the amount of pigment layer and intermediate layer used in the pellet core is too large, the pigment layer and intermediate layer near the pellet core layer may not be able to sense the flue gas temperature in time, affecting the color-changing effect. If the amount of pigment layer and intermediate layer used in the pellet core is too small, the temperature of the pigment layer and intermediate layer will change rapidly with the flue gas temperature, and the color-changing speed of each layer will also be faster, affecting the color-changing effect. Therefore, in order to ensure that the color of each pigment layer and pellet core layer can be effectively and stably presented, the mass ratio of the pellet core layer, each pigment layer, and each intermediate layer is preferably 100:(1-5):(1-5).

[0010] In the core layer of the cigarette, the low thermal conductivity material can delay the occurrence of color reversion. During periods of pause in cigarette smoking or after smoking has ended, as the temperature of the multi-color-changing core decreases, the decolorized pigment layer may revert to its original color. The core layer, made of a low thermal conductivity material, has a heat-insulating effect, preventing the core temperature from decreasing and thus delaying the color reversion. Simultaneously, due to the good viscosity and flowability of polyvinylpyrrolidone and microcrystalline cellulose, the core layer possesses better strength, toughness, and processing performance. Therefore, while ensuring that the multi-color-changing core can achieve multiple color changes at different temperatures, it also exhibits low brittleness and a high roundness qualification rate. The mass ratio of the low thermal conductivity material, microcrystalline cellulose, and polyvinylpyrrolidone is limited to (94-96):(1-5):(1-3). The low thermal conductivity material can be fumed silica, fumed titanium dioxide, or any combination of both, more preferably with a specific surface area of ​​20-400 m². 2 / g of hydrophobic fumed silica or fumed titanium dioxide, such as those with a specific surface area of ​​150-400m² 2 / g of hydrophobic fumed silica. The polyvinylpyrrolidone is preferably polyvinylpyrrolidone K12 type (PVP K12).

[0011] The main function of the pigment layer is thermochromic color development, and it is mainly composed of the heat-decolorizing thermochromic pigment and an adhesive. To effectively realize the function of the pigment layer and ensure color accuracy, the preferred mass ratio of the heat-decolorizing thermochromic pigment to the adhesive is (1-4.9):(0.05-0.1). Preferably, the color-changing temperature of the heat-decolorizing thermochromic pigment is 30-60℃. To improve the roundness and reduce brittleness of the pigment layer, the adhesive is preferably carrageenan, guar gum, or any combination of both. Besides improving the roundness and reducing brittleness, it is used in small quantities, thus minimizing its impact on the pigment color. Furthermore, as a plant-based adhesive, it is highly safe.

[0012] The primary function of the intermediate layer is to reduce color distortion caused by color superposition between adjacent pigment layers. Each pigment anti-corrosion sublayer is relatively thin, and its purpose is to separate the fatty acid sublayer within it from the adjacent pigment layer, preventing it from corroding the pigment layer. The pigment anti-corrosion sublayer is mainly composed of polyvinyl alcohol, such as polyvinyl alcohol 0588 (PVA0588) or polyvinyl alcohol 1788 (PVA1788). The fatty acid sublayer is mainly composed of fatty acids, and when the fatty acid is below its melting point, it is an opaque material, effectively masking the color of the inner pigment layer adjacent to the intermediate layer; when it is above its melting point and in a molten state, it is a transparent material, allowing the color of the inner pigment layer adjacent to it to appear; thus, it helps to reduce color distortion caused by color superposition between adjacent pigment layers. The fatty acid can be dodecanoic acid, tridecanoic acid, tetradecanoic acid, pentadecanoic acid, etc., or any combination of several fatty acids. To further reduce color distortion, the mass ratio of each pigment anti-corrosion sublayer to the fatty acid sublayer in the intermediate layer is (0.1-0.5):(1-4).

[0013] In this invention, the "thermally decolorizing thermochromic pigment" is a low-temperature color-developing pigment that changes from colored to colorless when the temperature rises to the color-changing temperature. The "fatty acid" in this invention mainly refers to saturated fatty acids, preferably straight-chain saturated fatty acids.

[0014] Furthermore, the multi-color-changing pellet core is composed of, from the inside out, a pellet core layer, a first pigment layer, a first intermediate layer, a second pigment layer, a second intermediate layer, and a third pigment layer, wherein the mass ratio of the pellet core layer, the first pigment layer, the first intermediate layer, the second pigment layer, the second intermediate layer, and the third pigment layer is 100:(1-5):(1-5):(1-5):(1-5):(1-5). The first pigment layer includes a type A heat-decolorizing thermochromic pigment, and its color-changing temperature is 50-60℃, preferably 55-60℃; the second pigment layer includes a type B heat-decolorizing pigment, and its color-changing temperature is 40-50℃, preferably 45-50℃; the third pigment layer includes a type C heat-decolorizing pigment, and its color-changing temperature is 30-40℃, preferably 35-40℃.

[0015] The first intermediate layer includes a first pigment anti-corrosion sublayer, a first fatty acid sublayer and a second pigment anti-corrosion sublayer arranged sequentially, wherein the material of the first fatty acid sublayer is tetradecanoic acid, pentadecanoic acid or any combination thereof;

[0016] The second intermediate layer includes a third pigment anti-corrosion sublayer, a second fatty acid sublayer, and a fourth pigment anti-corrosion sublayer, wherein the material of the second fatty acid sublayer is dodecanoic acid, tridecanoic acid, or any combination thereof.

[0017] To facilitate the coating and molding of the Type A heat-decolorizing thermochromic pigment, the first pigment layer may consist of the following components in parts by weight: 1-4.9 parts of the Type A heat-decolorizing thermochromic pigment and 0.05-0.1 parts of the first binder. The first binder may be carrageenan or guar gum, etc.

[0018] To facilitate the coating and molding of the type B heat-decolorizing thermochromic pigment, the second pigment layer is composed of the following components in parts by weight: 1-4.9 parts of the type B heat-decolorizing thermochromic pigment and 0.05-0.1 parts of the second binder. The second binder can be carrageenan or guar gum, etc.

[0019] To facilitate the coating and molding of the type C heat-decolorizing thermochromic pigment, the third pigment layer is composed of the following components in parts by weight: 1-4.9 parts of type C heat-decolorizing thermochromic pigment and 0.05-0.1 parts of third binder. The third binder can be carrageenan or guar gum, etc.

[0020] The first intermediate layer, from the inside out, is composed of the following components in parts by weight: 0.1-0.5 parts of the first pigment anti-corrosion sublayer, 1-4 parts of the first fatty acid sublayer, and 0.1-0.5 parts of the second pigment anti-corrosion sublayer; the second intermediate layer, from the inside out, is composed of the following components in parts by weight: 0.1-0.5 parts of the third pigment anti-corrosion sublayer, 1-4 parts of the second fatty acid sublayer, and 0.1-0.5 parts of the fourth pigment anti-corrosion sublayer. Preferably, the melting point of the fatty acid in the first intermediate layer is 50-55°C, and the melting point of the fatty acid in the second intermediate layer is 40-45°C.

[0021] It is understood that the various color-changing pellet cores can be further coated with a third intermediate layer, a fourth pigment layer, etc., as needed.

[0022] To facilitate the placement of the multi-color changing pellet core in the transparent cavity of the cigarette filter rod, the particle size of the multi-color changing pellet core is preferably 10-100 mesh. In particular, when the particle size of the multi-color changing pellet core is 12-25 mesh, the visual observation effect in the transparent cavity of the cigarette filter rod is better.

[0023] The multi-color-changing core can also carry functional ingredients, such as flavorings and humectants, giving it aroma-enhancing and moisture-retaining effects, thereby improving the characteristics and quality of cigarette products.

[0024] The main reason why the multi-color changing pellet core provided by the present invention can achieve controllable multi-color changing speed is that: (1) The pellet core layer is wrapped with multiple pigment layers with different color changing temperatures. The color changing temperature of the multiple pigment layers increases sequentially from the outside to the inside. As the smoke temperature gradually increases, the colors of the multiple pigment layers gradually disappear from the outside to the inside. Visually, multiple colors will be presented in sequence, namely the colors of each pigment layer and the color of the pellet core layer. For example, when the multi-color changing pellet core includes three pigment layers, it will present four colors in sequence, namely the color of the third pigment layer, the color of the second pigment layer, the color of the first pigment layer and the color of the pellet core layer. (2) An intermediate layer is set between adjacent pigment layers. When the smoke temperature is lower than the melting point of its fatty acid sublayer, the fatty acid sublayer in the intermediate layer is opaque, which can effectively cover the color of the inner pigment layer adjacent to the intermediate layer. When the smoke temperature is higher than the melting point of the fatty acid sublayer, the fatty acid sublayer will melt and become transparent, which will make the color of the inner pigment layer adjacent to it visible. This can reduce the color distortion caused by the color superposition between adjacent pigment layers. (3) The core layer of the pellet uses low thermal conductivity material as the main raw material, which can delay the occurrence of discoloration; at the same time, since polyvinylpyrrolidone and microcrystalline cellulose have good viscosity and fluidity, the core layer of the pellet is endowed with better strength, toughness and processing performance.

[0025] Therefore, the aforementioned multi-color changing core, through the synergistic effect between the components in the core core formula, and the synergistic effect between the core core, pigment layers, and intermediate layers, enables the multi-color changing core to undergo multiple color changes when smoking cigarettes. Furthermore, the formula design of each pigment layer and intermediate layer is beneficial to improving the roundness qualification rate of the multi-color changing core and reducing its brittleness.

[0026] A method for preparing the aforementioned multicolor-changing pellet core employs existing core-shell structure preparation methods. This preparation method may include the following steps:

[0027] (1) Preparation of pellet core layer

[0028] First, the components of the above-mentioned pellet core layer are uniformly mixed with water, and then the pellet core layer is formed into a predetermined shape; for example, the pellet core layer is formed into a circle using an existing extrusion spheroidization method. Specifically, 94-96 parts of low thermal conductivity material, 1-5 parts of microcrystalline cellulose, 1-3 parts of polyvinylpyrrolidone, and 180-200 parts of water are mixed evenly, and the pellet core layer is obtained using extrusion spheroidization and other techniques known in the art.

[0029] (2) Preparation of pigment layer

[0030] First, the components of the above-mentioned pigment layer are uniformly mixed with water to obtain a pigment coating solution; then, a coating machine is used to form a pigment layer from the pigment coating solution. Specifically, 1-4.9 parts of a type A heat-decolorizing thermochromic pigment, 0.05-0.1 parts of an adhesive, and 15-40 parts of water are mixed to obtain a coating solution. Using a coating method known in the art, the pigment coating solution is coated onto the surface of the core layer or intermediate layer of the pellet prepared in step (1) using a coating machine to form the corresponding pigment layer.

[0031] (3) Preparation of intermediate layer

[0032] A coating machine is used to sequentially form a first pigment anti-corrosion sublayer, a fatty acid sublayer, and a second pigment anti-corrosion sublayer on adjacent pigment layers, and an intermediate layer is formed on adjacent pigment layers. Specifically, a first pigment anti-corrosion sublayer coating solution is first prepared, and then the coating machine is used to coat the pigment layer obtained in step (2) with the first pigment anti-corrosion sublayer coating solution to form the first pigment anti-corrosion sublayer; then a fatty acid sublayer coating solution is prepared, and then the coating machine is used to coat the fatty acid sublayer coating solution with the first pigment anti-corrosion sublayer to form the fatty acid sublayer; then a second pigment anti-corrosion sublayer coating solution is prepared, and then the coating machine is used to coat the second pigment anti-corrosion sublayer coating solution with the fatty acid sublayer to form the second pigment anti-corrosion sublayer, thereby forming the intermediate layer.

[0033] For example, 0.1-0.5 parts of pigment anti-corrosion material and 2-10 parts of water are mixed to prepare a first pigment anti-corrosion coating liquid. The first pigment coating liquid is then coated onto the surface of the pigment layer prepared in step (2) using a coating machine to obtain a first pigment anti-corrosion sublayer.

[0034] Then, 1-4 parts of fatty acid sublayer and 20-80 parts of anhydrous ethanol are mixed to prepare fatty acid coating solution. The fatty acid coating solution is then coated on the surface of the first pigment anti-corrosion sublayer using a coating machine to obtain fatty acid sublayer.

[0035] Then, 0.1-0.5 parts of PVA05880 and 2-10 parts of water are mixed to prepare a second pigment anti-corrosion coating solution. The second pigment anti-corrosion coating solution is then coated onto the surface of the fatty acid sublayer using a coating machine to obtain the second pigment anti-corrosion sublayer, thereby obtaining the intermediate layer.

[0036] When the multicolor-changing pellet core comprises three pigment layers, its preparation method includes the following steps:

[0037] (11) Preparation of the core layer of the pellet is the same as in step (1).

[0038] (12) Preparation of the first pigment layer

[0039] The first pigment coating solution is prepared by mixing 1-4.9 parts of type A heat-decolorizing thermochromic pigment, 0.05-0.1 parts of binder, and 15-40 parts of water. The first pigment coating solution is then coated onto the surface of the core layer of the pellet prepared in step (11) using a coating machine to form the first pigment layer.

[0040] (13) Preparation of the first intermediate layer

[0041] First, mix 0.1-0.5 parts of PVA and 2-10 parts of water to prepare the first pigment anti-corrosion sublayer coating solution. Then, use a coating machine to coat the first pigment layer prepared in step (12) with the first pigment anti-corrosion sublayer coating solution to obtain the first pigment anti-corrosion sublayer.

[0042] Then, 1-4 parts of the first fatty acid sublayer and 20-80 parts of anhydrous ethanol are mixed to prepare the first fatty acid coating solution. The first fatty acid coating solution is coated on the surface of the first pigment anti-corrosion sublayer by a coating machine using a coating method to obtain the first fatty acid sublayer.

[0043] Then, 0.1-0.5 parts of PVA and 2-10 parts of water are mixed to prepare the second pigment anti-corrosion sublayer coating solution. The second pigment anti-corrosion sublayer coating solution is coated onto the surface of the first fatty acid sublayer using a coating machine to obtain the second pigment anti-corrosion sublayer, thereby obtaining the first intermediate layer.

[0044] (14) Preparation of the second pigment layer

[0045] A second pigment coating solution is prepared by mixing 1-4.9 parts of type B heat-decolorizing thermochromic pigment, 0.05-0.1 parts of binder, and 15-40 parts of water. The second pigment coating solution is then coated onto the surface of the first intermediate layer prepared in step (13) using a coating machine to form a second pigment layer.

[0046] (15) Preparation of the second intermediate layer

[0047] First, mix 0.1-0.5 parts of PVA and 2-10 parts of water to prepare the third pigment anti-corrosion sublayer coating solution. Then, use a coating machine to coat the third pigment anti-corrosion sublayer coating solution onto the surface of the second pigment layer prepared in step (14) to obtain the third pigment anti-corrosion sublayer.

[0048] Then, 1-4 parts of the second fatty acid sublayer and 20-80 parts of anhydrous ethanol are mixed to prepare the second fatty acid coating solution. The second fatty acid coating solution is coated onto the surface of the third pigment anti-corrosion sublayer using a coating machine to obtain the second fatty acid sublayer.

[0049] Then, 0.1-0.5 parts of PVA and 2-10 parts of water are mixed to prepare the fourth pigment anti-corrosion sublayer coating solution. The fourth pigment anti-corrosion sublayer coating solution is coated onto the surface of the second fatty acid sublayer using a coating machine to obtain the fourth pigment anti-corrosion sublayer, thereby obtaining the second intermediate layer.

[0050] (16) Preparation of the third pigment layer

[0051] A third pigment coating solution is prepared by mixing 1-4.9 parts of a type C heat-decolorizing thermochromic pigment, 0.05-0.1 parts of an adhesive, and 15-40 parts of water. The third pigment coating solution is then coated onto the surface of the second intermediate layer prepared in step (15) using a coating machine, thereby obtaining a multi-color-changing pellet core.

[0052] Furthermore, functional ingredients such as fragrances and moisturizers can be sprayed onto the core shell using methods such as spraying to obtain a multi-color changing core loaded with functional ingredients.

[0053] The method for preparing the multi-color changing filter core provided by this invention is simple, easy to operate, and can be industrialized. Furthermore, the multi-color changing filter core obtained by the above method has the characteristics of multiple color changes, low brittleness, and high roundness qualification rate, which can meet the different application processing needs of cigarette filter rods.

[0054] Another object of the present invention is to provide an application of the above-mentioned multi-color changing pellet core in cigarettes to enhance the cigarette consumption experience. The cigarette includes a filter rod with a transparent cavity, and the multi-color changing pellet core is filled in the transparent cavity.

[0055] To ensure visual effect, the amount of the multi-color changing pellet added to the transparent cavity is 10-60mg / cigarette, more preferably 20-50mg / cigarette.

[0056] Therefore, the multi-color-changing filter core features multiple color changes, low brittleness, and high sphericity, meeting the diverse processing requirements of cigarette filter rods. Furthermore, the filter core, after being loaded with functional components, also provides aroma enhancement and moisture retention, thereby improving the sensory quality of cigarettes. Thus, the aforementioned multi-color-changing filter core can cater to different consumption habits, enhancing the cigarette consumption experience. Attached Figure Description

[0057] Figure 1 This is a schematic diagram of the structure of the multicolor-changing pill provided in an embodiment of the present invention.

[0058] Figure 2 These are photographs of the multicolor-changing pills provided in Embodiment 1 of the present invention at different oven temperatures.

[0059] in, Figure 1 The symbols in the text are: 1. Core layer, 2. First pigment layer, 3. First intermediate layer, 4. Second pigment layer, 5. Second intermediate layer, 6. Third pigment layer. Detailed Implementation

[0060] The technical solution of the present invention will be further described in detail below through specific embodiments.

[0061] Unless otherwise specified, all terms used in this invention are commonly used in the relevant field. Raw materials, equipment, preparation processes, testing methods, etc., used in the embodiments, unless otherwise specified, are all prior art in the relevant field. The thermochromic pigments used in the following embodiments were all purchased from Dongguan Biansefeng New Materials Co., Ltd.; the fumed silica used in the following embodiments has a specific surface area of ​​200-250 m². 2 / g of hydrophobic fumed silica, and fumed titanium dioxide with a specific surface area of ​​40-50m². 2 / g of hydrophobic fumed titanium dioxide; all fatty acids are straight-chain alkyl acids.

[0062] Examples 1-10: Multicolor Changing Pills and Their Preparation Methods

[0063] Embodiments 1-8 of the present invention each provide a multi-color changing pellet core with a particle size of 12-25 mesh, which has a core-shell structure and is composed of a pellet core layer 1, a first pigment layer 2, a first intermediate layer 3, a second pigment layer 4, a second intermediate layer 5, and a third pigment layer 6 from the inside out. The mass ratio of the pellet core layer 1, the first pigment layer 2, the first intermediate layer 3, the second pigment layer 4, the second intermediate layer 5, and the third pigment layer 6 formed in the multi-color changing pellet core provided in each embodiment is specified.

[0064] Example 1

[0065] The mass ratio of the core layer, first pigment layer, first intermediate layer, second pigment layer, second intermediate layer and third pigment layer in the multicolor changing pellet core provided in this embodiment is 100:1.05:1.2:1.05:1.2:1.05.

[0066] Formula for preparing the core layer of the pellet: 94 parts fumed silica, 5 parts microcrystalline cellulose, 1 part polyvinylpyrrolidone, and 180 parts water;

[0067] The formula for preparing the first pigment layer is as follows: 1 part of type A heat-decolorizing red thermochromic pigment, 0.05 parts of carrageenan, and 15 parts of water;

[0068] The formulation for the preparation of the first intermediate layer is as follows: 0.2 parts of PVA0588, 4 parts of water, 1 part of tetradecanoic acid, and 20 parts of anhydrous ethanol. PVA0588 and water are each divided into two equal parts and mixed to form the first PVA0588 sublayer and the second PVA0588 sublayer, respectively.

[0069] The formula for preparing the second pigment layer is as follows: 1 part of type B heat-decolorizing yellow thermochromic pigment, 0.05 parts of guar gum, and 15 parts of water;

[0070] The preparation formula for the second intermediate layer is: 0.2 parts of PVA0588, 4 parts of water, 1 part of tridecanoic acid, and 20 parts of anhydrous ethanol. Among them, PVA0588 and water are each divided into two equal parts and mixed to form the third PVA0588 sublayer and the fourth PVA0588 sublayer, respectively.

[0071] The formula for preparing the third pigment layer is as follows: 1 part of Class C heat-decolorizing blue thermochromic pigment, 0.05 parts of carrageenan, and 15 parts of water.

[0072] Example 2

[0073] The mass ratio of the core layer, first pigment layer, first intermediate layer, second pigment layer, second intermediate layer and third pigment layer in the multicolor changing pellet core provided in this embodiment is 100:1.35:1.56:1.55:1.56:2.07.

[0074] Formula for preparing the core layer of the pellet: 96 parts fumed silica, 1 part microcrystalline cellulose, 3 parts polyvinylpyrrolidone, and 200 parts water;

[0075] The formula for preparing the first pigment layer is as follows: 1.3 parts of Class A heat-decolorizing red thermochromic pigment, 0.05 parts of guar gum, and 17 parts of water;

[0076] The formulation for preparing the first intermediate layer is as follows: 0.26 parts of PVA0588, 5.2 parts of water, 1.3 parts of tetradecanoic acid, and 26 parts of anhydrous ethanol. PVA0588 and water are each divided into two equal parts and mixed to form the first PVA0588 sublayer and the second PVA0588 sublayer, respectively.

[0077] The formula for preparing the second pigment layer is as follows: 1.5 parts of type B heat-decolorizing yellow thermochromic pigment, 0.05 parts of carrageenan, and 18 parts of water;

[0078] The formulation for the preparation of the second intermediate layer is as follows: 0.26 parts of PVA0588, 5.2 parts of water, 1.3 parts of dodecanoic acid, and 26 parts of anhydrous ethanol. Among them, PVA0588 and water are each divided into two equal parts and mixed to form the third and fourth PVA0588 sublayers, respectively.

[0079] The formula for preparing the third pigment layer is as follows: 2 parts of Class C heat-decolorizing green thermochromic pigment, 0.07 parts of carrageenan, and 25 parts of water.

[0080] Example 3

[0081] The mass ratio of the core layer, first pigment layer, first intermediate layer, second pigment layer, second intermediate layer and third pigment layer in the multicolor changing pellet core provided in this embodiment is 100:2.27:2.28:2.17:2.16:2.36.

[0082] Formula for preparing the core layer of the pellet: 96 parts of fumed titanium dioxide, 1 part of microcrystalline cellulose, 3 parts of polyvinylpyrrolidone, and 200 parts of water;

[0083] The formula for preparing the first pigment layer is as follows: 2.2 parts of type A heat-decolorizing red thermochromic pigment, 0.07 parts of carrageenan, and 25 parts of water;

[0084] The formulation for the preparation of the first intermediate layer is as follows: 0.38 parts of PVA0588, 7.6 parts of water, 1.9 parts of pentadecanoic acid, and 38 parts of anhydrous ethanol. PVA0588 and water are each divided into two equal parts and mixed to form the first PVA0588 sublayer and the second PVA0588 sublayer, respectively.

[0085] The formula for preparing the second pigment layer is as follows: 2.1 parts of type B heat-degrading coffee color thermochromic pigment, 0.07 parts of guar gum, and 26 parts of water;

[0086] The preparation formula for the second intermediate layer is: 0.36 parts of PVA0588, 7.2 parts of water, 1.8 parts of dodecanoic acid, and 36 parts of anhydrous ethanol. Among them, PVA0588 and water are each divided into two equal parts and mixed to form the third PVA0588 sublayer and the fourth PVA0588 sublayer, respectively.

[0087] The formula for preparing the third pigment layer is as follows: 2.3 parts of Class C heat-decolorizing blue thermochromic pigment, 0.06 parts of guar gum, and 23 parts of water.

[0088] Example 4

[0089] The mass ratio of the core layer, first pigment layer, first intermediate layer, second pigment layer, second intermediate layer and third pigment layer in the multicolor changing pellet core provided in this embodiment is 100:2.96:3:3.58:3:3.07.

[0090] Formula for preparing the core layer of the pellet: 90 parts fumed silica, 4 parts fumed titanium dioxide, 4 parts microcrystalline cellulose, 2 parts polyvinylpyrrolidone, and 185 parts water.

[0091] The formula for preparing the first pigment layer is: 2.9 parts of type A heat-decolorizing green thermochromic pigment, 0.06 parts of guar gum, and 29 parts of water;

[0092] The formulation for preparing the first intermediate layer is as follows: 0.50 parts of PVA0588, 10 parts of water, 2.5 parts of pentadecanoic acid, and 50 parts of anhydrous ethanol. PVA0588 and water are each divided into two equal parts and mixed to form the first PVA0588 sublayer and the second PVA0588 sublayer, respectively.

[0093] The formula for preparing the second pigment layer is as follows: 3.5 parts of type B heat-decolorizing blue thermochromic pigment, 0.08 parts of guar gum, and 30 parts of water;

[0094] The formulation for the preparation of the second intermediate layer is as follows: 0.50 parts of PVA0588, 10 parts of water, 2.5 parts of tridecanoic acid, and 50 parts of anhydrous ethanol. PVA0588 and water are each divided into two equal parts and mixed to form the third and fourth PVA0588 sublayers, respectively.

[0095] The formula for preparing the third pigment layer is as follows: 3 parts of Class C heat-decolorizing yellow thermochromic pigment, 0.07 parts of guar gum, and 31 parts of water.

[0096] Example 5

[0097] The mass ratio of the core layer, first pigment layer, first intermediate layer, second pigment layer, second intermediate layer and third pigment layer in the multicolor changing pellet core provided in this embodiment is 100:3.38:3.36:3.98:3.48:3.58.

[0098] Formula for preparing the core layer of the pellet: 50 parts fumed silica, 45 parts fumed titanium dioxide, 3 parts microcrystalline cellulose, 2 parts polyvinylpyrrolidone, and 195 parts water.

[0099] The formula for preparing the first pigment layer is as follows: 3.3 parts of type A heat-decolorizing purple thermochromic pigment, 0.08 parts of carrageenan, and 32 parts of water;

[0100] The formulation for the preparation of the first intermediate layer is as follows: 0.56 parts of PVA0588, 11.2 parts of water, 2.8 parts of tetradecanoic acid, and 56 parts of anhydrous ethanol. PVA0588 and water are each divided into two equal parts and mixed to form the first PVA0588 sublayer and the second PVA0588 sublayer, respectively.

[0101] The formula for preparing the second pigment layer is as follows: 3.9 parts of type B heat-degrading coffee color thermochromic pigment, 0.08 parts of carrageenan, and 34 parts of water;

[0102] The formulation for the preparation of the second intermediate layer is as follows: 0.58 parts of PVA0588, 11.6 parts of water, 2.9 parts of dodecanoic acid, and 58 parts of anhydrous ethanol. PVA0588 and water are each divided into two equal parts and mixed to form the third and fourth PVA0588 sublayers, respectively.

[0103] The formula for preparing the third pigment layer is as follows: 3.5 parts of Class C heat-decolorizing red thermochromic pigment, 0.03 parts of carrageenan, 0.05 parts of guar gum, and 35 parts of water.

[0104] Example 6

[0105] The mass ratio of the core layer, first pigment layer, first intermediate layer, second pigment layer, second intermediate layer and third pigment layer in the multicolor changing pellet core provided in this embodiment is 100:4.19:3.96:4.59:4.2:4.39.

[0106] Formula for preparing the core layer of the pellet: 30 parts fumed silica, 65 parts fumed titanium dioxide, 2 parts microcrystalline cellulose, 3 parts polyvinylpyrrolidone, and 200 parts water;

[0107] The formula for preparing the first pigment layer is as follows: 4.1 parts of Class A heat-decolorizing deep blue thermochromic pigment, 0.09 parts of carrageenan, and 38 parts of water;

[0108] The formulation for preparing the first intermediate layer is as follows: 0.66 parts of PVA0588, 13.2 parts of water, 1 part of tetradecanoic acid, 2.3 parts of pentadecanoic acid, and 66 parts of anhydrous ethanol. PVA0588 and water are each divided into two equal parts and mixed to form the first PVA0588 sublayer and the second PVA0588 sublayer, respectively.

[0109] Formula for preparing the second pigment layer: 4.5 parts of type B heat-decolorizing red thermochromic pigment, 0.09 parts of guar gum, and 39 parts of water;

[0110] The formulation for the preparation of the second intermediate layer is as follows: 0.70 parts of PVA0588, 14 parts of water, 3.5 parts of tridecanoic acid, and 70 parts of anhydrous ethanol. PVA0588 and water are each divided into two equal parts and mixed to form the third and fourth PVA0588 sublayers, respectively.

[0111] The formula for preparing the third pigment layer is as follows: 4.3 parts of Class C heat-decolorizing yellow thermochromic pigment, 0.09 parts of carrageenan, and 40 parts of water.

[0112] Example 7

[0113] The mass ratio of the core layer, first pigment layer, first intermediate layer, second pigment layer, second intermediate layer and third pigment layer in the multicolor changing pellet core provided in this embodiment is 100:4.6:4.8:4.7:4.8:5.

[0114] Formula for preparing the core layer of the pellet: 2 parts fumed silica, 94 parts fumed titanium dioxide, 1 part microcrystalline cellulose, 3 parts polyvinylpyrrolidone, and 200 parts water;

[0115] The formula for preparing the first pigment layer is as follows: 4.5 parts of Class A heat-degrading orange thermochromic pigment, 0.04 parts of carrageenan, 0.06 parts of guar gum, and 39 parts of water;

[0116] The formulation for the preparation of the first intermediate layer is as follows: 0.8 parts of PVA0588, 16 parts of water, 4 parts of tetradecanoic acid, and 80 parts of anhydrous ethanol. PVA0588 and water are each divided into two equal parts and mixed to form the first PVA0588 sublayer and the second PVA0588 sublayer, respectively.

[0117] The formula for preparing the second pigment layer is as follows: 4.6 parts of type B heat-decolorizing green thermochromic pigment, 0.1 parts of guar gum, and 40 parts of water;

[0118] The preparation formula for the second intermediate layer is: 0.80 parts of PVA0588, 16 parts of water, 3 parts of tridecanoic acid, 1 part of dodecanoic acid, and 80 parts of anhydrous ethanol. Among them, PVA0588 and water are each divided into two equal parts and mixed to form the third PVA0588 sublayer and the fourth PVA0588 sublayer, respectively.

[0119] The formula for preparing the third pigment layer is as follows: 4.9 parts of Class C heat-decolorizing coffee-colored thermochromic pigment, 0.1 parts of carrageenan, and 40 parts of water.

[0120] Example 8

[0121] In this embodiment, the mass ratio of the core layer, the first pigment layer, the first intermediate layer, the second pigment layer, the second intermediate layer, and the third pigment layer in the multi-color changing pellet core is 100:5:5:5:5:5.

[0122] Formula for preparing the core layer of the pellet: 96 parts fumed silica, 1 part microcrystalline cellulose, 3 parts polyvinylpyrrolidone, and 200 parts water;

[0123] The formula for preparing the first pigment layer is: 4.9 parts of type A heat-decolorizing blue thermochromic pigment, 0.1 parts of guar gum, and 40 parts of water;

[0124] The formulation of the first intermediate layer is: 1.0 part of PVA0588, 20 parts of water, 4 parts of tetradecanoic acid, and 80 parts of anhydrous ethanol. PVA0588 and water are each divided into two equal parts and mixed to form the first PVA0588 sublayer and the second PVA0588 sublayer, respectively.

[0125] The formula for preparing the second pigment layer is as follows: 4.9 parts of type B heat-degrading coffee color thermochromic pigment, 0.05 parts of carrageenan, 0.05 parts of guar gum, and 40 parts of water;

[0126] The preparation formula for the second intermediate layer is: 1.0 part of PVA0588, 20 parts of water, 4 parts of dodecanoic acid, and 80 parts of anhydrous ethanol. PVA0588 and water are each divided into two equal parts and mixed to form the third and fourth PVA0588 sublayers, respectively.

[0127] The formula for preparing the third pigment layer is as follows: 4.9 parts of Class C heat-decolorizing orange thermochromic pigment, 0.1 parts of guar gum, and 40 parts of water.

[0128] The embodiments of the present invention also provide a method for preparing the above-mentioned multicolor-changing pellet core, comprising:

[0129] (11) Preparation of pellet core layer

[0130] Following the formulations shown in each embodiment, the low thermal conductivity material, microcrystalline cellulose, PVP, and water were mixed evenly, and the pellet core layer 1 was prepared by extrusion spheronization.

[0131] (12) Preparation of the first pigment layer

[0132] According to the formulations shown in the various embodiments, a first pigment coating solution is prepared by mixing a type A heat-decolorizing thermochromic pigment, a first adhesive, and water. The first pigment coating solution is then coated onto the surface of the core layer 1 of the pellet using a coating machine, thereby forming the first pigment layer 2.

[0133] (13) Preparation of the first intermediate layer

[0134] According to the proportions shown in each embodiment, PVA0588 and water are mixed to prepare PVA0588 coating solution. The coating solution is then coated onto the surface of the first pigment layer prepared in step (2) using a coating machine to obtain the first PVA0588 sublayer.

[0135] The coating solution was prepared by mixing the first fatty acid and anhydrous ethanol according to the proportions shown in the embodiments. The coating solution was then coated onto the surface of the first PVA0588 sublayer using a coating machine to obtain the first fatty acid sublayer.

[0136] According to the proportions shown in each embodiment, PVA0588 and water are mixed to prepare a coating solution. The coating solution is then coated onto the surface of the first fatty acid sublayer using a coating machine to obtain a second PVA0588 sublayer, thereby forming a first intermediate layer 3 on the surface of the first pigment layer 2.

[0137] (14) Preparation of the second pigment layer

[0138] According to the formulations shown in each embodiment, a second pigment coating solution is prepared by mixing a type B heat-decolorizing thermochromic pigment, a second adhesive, and water. The second pigment coating solution is then coated onto the surface of the first intermediate layer 3 using a coating machine to form a second pigment layer 4.

[0139] (15) Preparation of the second intermediate layer

[0140] Referring to the same method as step (13) "Preparation of the first intermediate layer" above, and in conjunction with the formulations shown in each embodiment, the third PVA0588 sublayer, the second fatty acid sublayer and the fourth PVA0588 sublayer are sequentially coated on the surface of the second pigment layer 4, thereby forming the second intermediate layer 5 on the surface of the second pigment layer 4.

[0141] (16) Preparation of the third pigment layer

[0142] According to the formulations shown in each embodiment, a third pigment coating solution is prepared by mixing a type C heat-decolorizing thermochromic pigment, a second adhesive, and water. The third pigment coating solution is then coated onto the surface of the second intermediate layer 5 using a coating machine to form a third pigment layer 6, thereby obtaining a multi-color-changing pellet core.

[0143] Among them, photographs of the multicolor-changing pellet cores prepared in Example 1 at room temperature (normal room temperature) and after being placed in ovens at 45°C, 55°C, and 65°C for 30 seconds are shown below. Figure 1 As shown.

[0144] Example 9

[0145] This embodiment provides a multi-color changing core with aroma-enhancing function. The main difference between this embodiment and Embodiment 1 is that 0.5g of tobacco flavoring is sprayed onto 100g of the multi-color changing core provided in Embodiment 1 using a spray method. After drying, a multi-color changing core with aroma-enhancing function is obtained.

[0146] Example 10

[0147] This embodiment provides a multi-color changing pellet core with a moisturizing function. The main difference between this embodiment and Embodiment 2 is that 1g of propylene glycol is sprayed onto 100g of the multi-color changing pellet core provided in Embodiment 2 using a spray method, and after drying, a multi-color changing pellet core with a moisturizing function is obtained.

[0148] Comparative Example 1

[0149] Based on Example 2, the amount of polyvinylpyrrolidone in the core layer of the pellet was increased to 4.0 parts, while other conditions remained unchanged.

[0150] Comparative Example 2

[0151] Based on Example 1, the amount of carrageenan in the third pigment layer was reduced to 0.02 parts, while other conditions remained unchanged.

[0152] Comparative Example 3

[0153] Based on Example 8, the amount of dodecanoic acid in the second intermediate layer was reduced to 0.9 parts, while other conditions remained unchanged.

[0154] Comparative Example 4

[0155] Based on Example 4, the amount of pentadecanoic acid in the first intermediate layer was increased to 4.3 parts, while other conditions remained unchanged.

[0156] Application Examples

[0157] This application provides examples 1-10 and comparative examples 1-4, each containing a corresponding multi-color-changing core. The cigarette is a medium-length cigarette, and its filter rod is a ternary composite filter rod with a transparent cavity. The transparent cavity is filled with the multi-color-changing cores provided in examples 1-10 and comparative examples 1-5, respectively. In this application, the filter rod has dimensions of 15mm + 5mm + 10mm (tobacco end), the length of the transparent cavity is 5mm, and the amount of each multi-color-changing core added is 40mg per cigarette.

[0158] Performance verification

[0159] The brittleness, roundness qualification rate, and color change of the multi-color changing pellet cores provided in Examples 1-10 and Comparative Examples 1-4 of the present invention were tested, and the results are shown in Table 1.

[0160] 1) Friability: Friability of the multi-color changing filter core reflects its resistance to wear and vibration, and is one of its important characteristics. It not only affects the coating quality but also has a significant impact on the transportation and subsequent application of the multi-color changing filter core. Low friability indicates good coating quality and less powder formation, thus facilitating transportation and subsequent application and reducing transportation and application difficulties. Combining the general industrial requirements for the friability of existing filter core products and the application of the multi-color changing filter core provided by this invention in cigarette filter rods, a friability of <0.8% is considered qualified for multi-color changing filter core products.

[0161] The friability of multicolor-changing pellet cores was tested using a friability tester. The test method was as follows: the fine powder adhering to the surface of the multicolor-changing pellet cores was brushed off, weighed, and placed into the drum of the friability tester. After the drum rotated at a speed of 25 r / min for 4 minutes, the multicolor-changing pellet cores were removed, weighed, and the friability was calculated. Friability = (mass of multicolor-changing pellet cores before test - mass of multicolor-changing pellet cores after test) / mass of multicolor-changing pellet cores before test × 100%.

[0162] 2) Roundness Qualification Rate: The roundness of the pellet core is one of its important characteristics, reflecting the quality of the multi-color changing pellet core formation. The roundness of the pellet core directly affects the deposition and formation of the surface material on the pellet core surface, thus affecting the coating quality and consequently the color-changing, aroma-enhancing, and moisture-retaining functional properties of the multi-color changing pellet core. High roundness and uniform size and shape of the pellet core are ideal conditions for preparing multi-color changing pellet cores.

[0163] The method for determining the roundness of multicolor changing pellet cores is as follows: Under a microscope, measure the minimum diameter and the maximum diameter of the multicolor changing pellet cores. The closer the ratio of the minimum diameter to the maximum diameter is to 1, the better the roundness. Usually, a ratio greater than 0.8 is considered qualified. The roundness qualification rate = (number of particles with a minimum diameter to maximum diameter ratio greater than 0.8) / (total number of particles sampled) × 100%.

[0164] 3) Color Change Test: The cigarettes provided in the "Application Examples" were used as the test samples. Before the test, the cigarette samples were equilibrated for 48 hours at a temperature of (22±1)℃ and a relative humidity of (60±2)%. Then, they were sorted by weight (average weight ±0.02g) and draw resistance (average draw resistance ±49Pa) to select the test cigarettes that met the standards. The cigarette smoking test was carried out on a smoking machine according to the standard smoking conditions, and the color change of the cigarette core was observed. The results are shown in Table 1.

[0165] Table 1 Performance Verification of Multicolor Changing Pellet Cores

[0166]

[0167]

[0168] As can be seen from Table 3, the roundness qualification rate of the multi-color changing pellet core provided in Comparative Example 1 is 57%, which is much lower than the 72% roundness qualification rate of the pellet core in Example 2. This is mainly because as the amount of adhesive used in the pellet core layer increases, the viscosity of the pellet core layer changes greatly and the plasticity deteriorates during the molding process, resulting in a lower roundness qualification rate.

[0169] The multi-color changing pellet core provided in Comparative Example 2 had a friability of 0.95%, which is a substandard product; this is higher than the 0.72% of Example 1, which is a qualified product. This is mainly because as the amount of adhesive used in the pellet core shell decreases, the bonding effect of the pellet core shell weakens, making it easier to shed powder and increasing friability.

[0170] The color-changing effect of the multi-color-changing cigarette core sample provided in Comparative Example 3 was dark brown → coffee → blue → white, while the color-changing effect of the cigarette core in Example 8 was orange → coffee → blue → white. This is mainly due to the reduced amount of dodecanoic acid in the second intermediate layer, which caused the colors of the second and third pigment layers to overlap during inhalation, resulting in a change in the color of the third pigment layer from orange to dark brown.

[0171] The color-changing effect of the cigarette core sample provided in Comparative Example 4 was yellow → blue → light green → white, while the color-changing effect of the core in Example 4 was yellow → blue → green → white. This is mainly due to the increased amount of pentadecanoic acid in the first intermediate layer, which causes the color of the first pigment layer to be masked during inhalation, changing from the original green to light green.

[0172] Therefore, the multi-color-changing pellet core provided in this embodiment of the invention, through the synergistic effect of controlling the mass ratio of the pellet core layer and the pellet core shell layer, the raw materials and dosage of the pellet core layer, and the raw materials and formulation of the pellet core shell layer, enables the multi-color-changing pellet core to change color and revert to its original color under different conditions depending on the different thermochromic materials contained therein. Furthermore, the synergistic effect among the raw materials in the multi-color-changing pellet core provided in this embodiment of the invention results in a friability of less than 0.8% and a roundness qualification rate exceeding 70%.

[0173] Therefore, the multi-color changing core provided by the present invention has the characteristics of multiple color changes, low brittleness, and high roundness, which can not only improve the consumption experience of cigarettes, but also meet the different application processing needs of cigarette filter rods.

[0174] Sensory evaluation: Using current standards, the cigarettes with multi-color changing cores provided in Examples 1, 2 and 9-10 respectively, provided in the "Application Examples" were used as the evaluation objects for sensory evaluation of the cigarettes.

[0175] Compared with the cigarettes using the multi-color changing core provided in Example 1, the cigarettes using the multi-color changing core with aroma-enhancing function provided in Example 9 have the effect of enhancing aroma and improving cigarette quality. Compared with the cigarettes using the multi-color changing core provided in Example 2, the cigarettes using the multi-color changing core with moisture-retaining function provided in Example 10 have the effect of reducing impurities and irritation, and improving comfort.

[0176] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A multi-color-changing pellet core, characterized in that: It has a core-shell structure, consisting of a core layer, multiple pigment layers, and an intermediate layer disposed between each pair of adjacent pigment layers, and the pigment layers are wrapped on the surface of the core layer. The core layer of the pellet is composed of the following components in parts by weight: 94-96 parts of low thermal conductivity material, 1-5 parts of microcrystalline cellulose and 1-3 parts of polyvinylpyrrolidone, wherein the thermal conductivity of the low thermal conductivity material is less than 0.05 W / m*K. The pigment layer includes a heat-decolorizing thermochromic pigment, and the color-changing temperature of the heat-decolorizing thermochromic pigment in the multiple pigment layers gradually decreases along the direction from the core layer outward. The intermediate layer includes two pigment anti-corrosion sublayers and a fatty acid sublayer sandwiched between the two pigment anti-corrosion sublayers, and the melting point of the fatty acid sublayer is between the temperature change temperatures of the adjacent pigment layers, and the fatty acid sublayer is mainly composed of fatty acids. The mass ratio of the core layer, each pigment layer, and each intermediate layer is 100 : (1-5) : (1-5).

2. The multi-color-changing pellet core according to claim 1, characterized in that: The particle size of the multi-color changing pellet core is 10-100 mesh.

3. The multi-color-changing pellet core according to claim 2, characterized in that: The particle size of the multi-color changing pellet core is 12-25 mesh.

4. The multi-color-changing pellet core according to claim 1, characterized in that: The pigment layer is mainly composed of the heat-decolorizing thermochromic pigment and an adhesive.

5. The multi-color-changing pellet core according to claim 4, characterized in that: The mass ratio of the heat-decolorizing thermochromic pigment to the adhesive is (1-4.9): (0.05-0.1).

6. The multi-color-changing pellet core according to claim 4 or 5, characterized in that: The adhesive is carrageenan, guar gum, or any combination of both.

7. The multi-color-changing pellet core according to claim 4 or 5, characterized in that: The color-changing temperature of the heat-decolorizing thermochromic pigment is 30-60℃.

8. The multi-color-changing pellet core according to any one of claims 1-5, characterized in that: The mass ratio of each pigment anti-corrosion sublayer to the fatty acid sublayer in the intermediate layer is (0.1-0.5):(1-4).

9. The multi-color-changing pellet core according to claim 8, characterized in that: The fatty acid is dodecanoic acid, tridecanoic acid, tetradecanoic acid, pentadecanoic acid, or any combination thereof.

10. The multi-color-changing pellet core according to any one of claims 1-5, characterized in that: The pigment anti-corrosion sublayer is mainly composed of polyvinyl alcohol.

11. The multi-color-changing pellet core according to claim 10, characterized in that: The polyvinyl alcohol is polyvinyl alcohol 0588 or polyvinyl alcohol 1788.

12. The multicolor-changing pellet core according to any one of claims 1-5, characterized in that: The low thermal conductivity material is fumed silica, fumed titanium dioxide, or any combination of the two.

13. The multi-color-changing pellet core according to claim 12, characterized in that: The low thermal conductivity material has a specific surface area of ​​20-400 m². 2 / g of hydrophobic fumed silica or fumed titanium dioxide.

14. The multi-color-changing pellet core according to any one of claims 1-5, characterized in that: It also contains functional ingredients, including fragrances, humectants, or any combination thereof.

15. The multi-color-changing pellet core according to any one of claims 1-5, characterized in that: The multi-color-changing pellet core is composed of, from the inside out, a pellet core layer, a first pigment layer, a first intermediate layer, a second pigment layer, a second intermediate layer, and a third pigment layer. The mass ratio of the pellet core layer, the first pigment layer, the first intermediate layer, the second pigment layer, the second intermediate layer, and the third pigment layer is 100 : (1-5) : (1-5) : (1-5) : (1-5). The first pigment layer includes a type A heat-decolorizing thermochromic pigment with a color-changing temperature of 50-60℃; the second pigment layer includes a type B heat-decolorizing thermochromic pigment with a color-changing temperature of 40-50℃; and the third pigment layer includes a type C heat-decolorizing thermochromic pigment with a color-changing temperature of 30-40℃. The first intermediate layer includes a first pigment anti-corrosion sublayer, a first fatty acid sublayer and a second pigment anti-corrosion sublayer arranged sequentially, wherein the material of the first fatty acid sublayer is tetradecanoic acid, pentadecanoic acid or any combination thereof; The second intermediate layer includes a third pigment anti-corrosion sublayer, a second fatty acid sublayer, and a fourth pigment anti-corrosion sublayer, wherein the material of the second fatty acid sublayer is dodecanoic acid, tridecanoic acid, or any combination thereof.

16. The multi-color-changing pellet core according to claim 15, characterized in that: The color-changing temperature of the type A heat-decolorizing thermochromic pigment is 55-60℃, the color-changing temperature of the type B heat-decolorizing thermochromic pigment is 45-50℃, and the color-changing temperature of the type C heat-decolorizing thermochromic pigment is 35-40℃.

17. A method for preparing the multi-color-changing pellet core according to claim 1, comprising the following steps: Preparation of the core layer: First, the components of the core layer are uniformly mixed with water, and then the core layer of the predetermined shape is formed. Pigment layer preparation: First, the components of the pigment layer are uniformly mixed with water to obtain a pigment coating solution; then, the pigment coating solution is coated onto the core layer of the pellet or the adjacent intermediate layer using a coating machine to form the corresponding pigment layer. Intermediate layer preparation: Using a coating machine, a first pigment anti-corrosion sublayer, a fatty acid sublayer, and a second pigment anti-corrosion sublayer are sequentially formed on adjacent pigment layers to obtain the corresponding intermediate layer.

18. The application of a multi-color changing pellet core as described in any one of claims 1-16 in cigarettes.

19. The application according to claim 18, characterized in that: The cigarette includes a filter rod with a transparent cavity, and the multi-color changing pellet core is filled in the transparent cavity.

20. The application according to claim 19, characterized in that: The amount of the multi-color-changing pellet added to the transparent cavity is 10-60 mg per cigarette.

21. The application according to claim 20, characterized in that: The amount of the multi-color-changing pellet added to the transparent cavity is 20-50 mg per cigarette.

Images