Fragrance-releasing color-changing gel ball as well as preparation method and application thereof

Abstract

The invention discloses a color-changing gel ball capable of releasing fragrance, the particle size of the gel ball is 3.2-3.6 mm, the color of the gel ball changes along with temperature change, and the gel ball can release fragrance molecules. The invention further discloses a preparation method and application of the fragrance-releasing color-changing gel ball.

Description

Technical Field

[0001] The patent of the present invention belongs to the field of tobacco additive materials, and specifically relates to gel balls that can release fragrance and change color, their preparation method and application in cigarette filter rods. Background Art

[0002] Photonic crystals, as a structure composed of dielectric materials with different dielectric constants arranged regularly and periodically in space, exhibit a unique physical property - photonic band gap. This band gap characteristic can induce rich optical color effects depending on the difference in the wavelength of the incident light. Specifically, the periodic arrangement of two dielectric materials with different dielectric constants constructs a specific "photon potential field". Once this arrangement pattern is adjusted, the photonic crystal immediately exhibits the ability to change color.

[0003] The potential chemical pollution and toxicity of traditional color-changing materials limit their application in sensitive fields such as cigarette products. In addition, in the current optoelectronics industry, the color-changing technology used in liquid crystal displays and LED screens often requires high energy consumption to achieve color conversion. Although patent CN2005100112192 reports a full-color colloidal photonic crystal film and its preparation method and application, this solution lacks gel substrate support and relies on light waves to trigger the color change mechanism, rather than the color change caused by temperature changes.

[0004] The present invention is proposed for this purpose. Summary of the invention

[0005] In view of this, the present invention discloses a fragrance-releasing color-changing gel ball and a preparation method thereof. The fragrance-releasing color-changing gel ball of the present invention changes color with temperature and can release fragrance molecules. The preparation method of the fragrance-releasing color-changing gel ball of the present invention first sprays a photocurable resin film layer on the surface of the fragrance-carrying composite ball as the basic support structure of the photonic crystal film layer, and at the same time plays a role in secondary solidification of the fragrance-carrying composite ball, and is also the color-developing matrix of the photonic crystal film; then, sprays the photonic crystal film, and the photonic crystal particles are arranged and aggregated to adhere to the photocurable film through the "self-assembly" effect to form a photonic crystal film layer; finally, a layer of photocurable resin film layer is wrapped on this surface to provide a solid film shell and an additional protective barrier layer for the fragrance-releasing color-changing gel ball. Located between these two layers of photocurable resin film layers is a photonic crystal film layer, and the core-shell structure particles in the photonic crystal film layer can produce color changes in response to temperature changes; at the same time, the fragrance-releasing color-changing gel ball itself also has the function of adjusting the release of fragrance with temperature. The entire flavor-releasing color-changing gel ball is then implanted into a visual ternary filter rod designed with transparent tipping paper through a filter rod forming method; during the cigarette smoking process, the user can not only observe the color changes of the flavor-releasing color-changing gel ball with temperature changes, but also experience the released aroma substances, thereby effectively supplementing and enhancing the sensory enjoyment of the smoke.

[0006] The technical solution of the present invention is as follows:

[0007] The first aspect of the present invention discloses a fragrance-releasing color-changing gel ball, the particle size of which is 3.2-3.6 mm, the color of which changes with temperature and can release fragrance molecules.

[0008] Preferably, the fragrance-releasing color-changing gel ball comprises a core, a middle layer and an outer layer; wherein the core comprises a fragrance-carrying composite ball and a composite ball protective layer, the middle layer is a photonic crystal film layer, and the outer layer is a gel ball protective layer; the composite ball protective layer and the gel ball protective layer are both photocurable resin film layers, and the thickness of the photocurable resin film layer is 20-35 μm.

[0009] Preferably, the thickness of the photonic crystal film layer is 20-35 μm, which is a film layer formed by the arrangement and aggregation of multiple core-shell structured particles, the particle size of the particles is 170-300 nm, wherein the thickness of the particle shell is 20-50 nm; the particles are monodisperse latex particles, and their polydispersity index is not greater than 0.005, and the glass transition temperature of the core polymer of the particles is greater than the glass transition temperature of the shell polymer; the arrangement and aggregation mode of the particles in the photonic crystal film layer and the gaps between the particles change with temperature.

[0010] The second aspect of the present invention discloses a method for preparing the fragrance-releasing color-changing gel ball, comprising the following steps:

[0011] (1) preparing a fragrance-carrying composite ball;

[0012] (2) preparing a formulation colloid of a photocurable resin film layer;

[0013] (3) wrapping the formulated colloid of the light-curable resin film layer of step (2) on the surface of the fragrance-carrying composite ball of step (1), and then irradiating it with near-ultraviolet light in a shaking table to cure and shape it to obtain the core;

[0014] (4) preparing an emulsion having core-shell structured particles;

[0015] (5) spraying the emulsion of the core-shell structured particles obtained in step (4) onto the surface of the core obtained in step (3), and then standing at a certain temperature for a period of time to obtain the photonic crystal film layer;

[0016] (6) Spraying the formulated colloid of the photocurable resin film layer of step (2) onto the surface of the photonic crystal film layer obtained in step (5), and then irradiating it with an ultraviolet point light source in a shaking incubator for a period of time to obtain the fragrance-releasing color-changing gel spheres.

[0017] Preferably, the preparation method of the fragrance-carrying composite ball in step (1) is: mixing the plant extract, essence, solvent and fragrance-carrying material, and then dripping them into a spherical mold with a diameter of 3.2-3.6 mm at a certain rate with a dropper, and refrigerating for a period of time to obtain the fragrance-carrying composite ball; wherein the solvent is preferably a 95% ethanol solution.

[0018] Preferably, the formulation of the photocurable resin film layer in step (2) comprises: epoxy resin monomer, IBOA, HDDA, butyl acetate and photoinitiator; wherein the mass ratio of epoxy resin monomer, IBOA, HDDA and butyl acetate is 52.5:12.2:10.1:25.2; the photoinitiator is (4-8)% of the mass of the polymer monomer;

[0019] The method of wrapping the surface of the fragrance-carrying composite ball with the formulated colloid of the photocurable resin film layer in step (3) is as follows: completely immersing the fragrance-carrying composite ball in the formulated colloid of the photocurable resin film layer, with the shaking speed of 100-200 rpm, the near-ultraviolet light of 360-370 nm, and the irradiation time of 1-2 min.

[0020] Preferably, the step (4) of preparing an emulsion of core-shell structured particles is as follows: monomer 1 and monomer 2 are mixed and dispersed in an aqueous solution containing a pH buffer and an emulsifier, and the mixture is stirred at a speed of 300-800 rpm and at a temperature of 70-80° C., 1 / 2 of the total amount of initiator is added to start the reaction, and 1 / 4 of the total amount of initiator is added after 2-5 hours, and the remaining initiator is added after 2-5 hours to obtain an emulsion of core-shell structured particles; wherein the glass transition temperature of monomer 1 is greater than the glass transition temperature of monomer 2.

[0021] Preferably, the spraying in step (5) or step (6) is carried out by air spraying; the spraying parameters are: the air pump pressure is 0.49-0.55 MPa, the distance between the spray gun nozzle and the surface of the core is 25-30 cm; the time used for spraying each core is 4-5 seconds.

[0022] Preferably, the energy of the ultraviolet point light source in step (6) is 32 mW / cm 2 , irradiation time was 300s, and the shaking speed was 100-200rpm.

[0023] The third aspect of the present invention discloses the use of the flavor-releasing color-changing gel ball in a cigarette filter rod.

[0024] Beneficial effects of the present invention:

[0025] The color-changing gel ball that can release fragrance of the present invention has a particle size of 3.2-3.6mm; the gel ball changes color with temperature and can release fragrance molecules. The color-changing gel ball that can release fragrance of the present invention comprises a core, an intermediate layer and an outer layer; wherein the core comprises a fragrance-carrying composite ball and a composite ball protective layer, the intermediate layer is a photonic crystal film layer, and the outer layer is a gel ball protective layer; the composite ball protective layer and the gel ball protective layer are both photocurable resin film layers, and the thickness of the photocurable resin film layer is 20-35μm. The thickness of the photonic crystal film layer is 20-35μm, which is a film layer formed by the arrangement and aggregation of multiple particles with core-shell structures, the particle size of the particles is 170-300nm, and the thickness of the particle shell is 20-50nm; the particles are monodisperse latex particles, and the polydispersity index is not greater than 0.005, and the glass transition temperature of the core polymer of the particles is greater than the glass transition temperature of the shell polymer; the arrangement and aggregation mode of the particles in the photonic crystal film layer and the gaps between the particles change with temperature.

[0026] During the smoking process of cigarettes, after the third to fourth puffs, the filter rod temperature can be increased from 40-50°C to 65-70°C, and after the fifth puff, it can be increased to above 80°C. The fragrance-releasing color-changing gel ball of the present invention is used in cigarette filter rods, wherein the fragrance-carrying composite ball is a solid gel system composed of a variety of natural biopolymer polysaccharides and polymers, which will transform into a gel particle system with an open cavity as the temperature rises; at this time, a single or composite fragrance component is added, and different fragrance factors will enter the cavity of the corresponding structure; after all the fragrance factors enter the cavity, the temperature is immediately reduced to below 40-50°C, the system will gradually solidify, the cavity is closed, and a dense layer is formed on the surface to bind and store the fragrance factors; during the smoking process of cigarettes, when the temperature slowly rises to above 40-50°C, the cavity will gradually open, and the fragrance factors inside will slowly loosen and release.

[0027] The fragrance-releasing color-changing gel ball of the present invention is firstly shaped by using a light-curing epoxy resin, and then a colloidal photonic crystal film layer is prepared. The photonic crystal film layer is a microsphere particle with a monodisperse core-shell structure, which has a polymer with a relatively high glass transition temperature (Tg) (such as polystyrene) as a core and a polymer with a relatively low glass transition temperature (Tg) (polyacrylate) as a shell layer; the dispersion coefficient is less than 0.005, and the particle size range is 170-300nm (such as Figure 1 and Figure 5As shown); the prepared colloid is sprayed onto the surface of the fragrance-carrying composite ball, and the photonic crystal particles spontaneously aggregate into a stable film layer with a certain regular geometric appearance structure through the particle "self-assembly effect", that is, the interaction of non-covalent bonds. Photonic crystal particles absorb a specific spectrum through a certain regular arrangement and present a specific color; when heated, the arrangement and gaps between particles will change due to the intensified thermal motion of the particles that make up the photonic crystal, causing the material to expand anisotropically, resulting in a change in the refractive index; thus, the appearance of the material changes color (such as Figure 6 As shown in the figure, during the smoking process of the cigarette, the photonic crystal film layer will produce a color change effect as the temperature rises. In order to protect the photonic crystal film layer, the outermost layer of the fragrance-releasing color-changing gel ball of the present invention also has a photocurable resin film layer for solidification and protection, so as to protect the fragrance-carrying composite ball material and the photonic crystal film layer from damage during production and transportation.

[0028] However, the photocurable resin film layer (based material is AESO) is not a completely closed film. The epoxy resin is cross-linked through monofunctional groups and bifunctional groups. The active diluents are isobornyl acrylate (IBOA) and 1,6-hexanediol diacrylate (HDDA). The monofunctional IBOA can linearly connect the epoxy resin, while the bifunctional active diluent HDDA can form a network cross-linked structure of the epoxy resin (see Figure 3 ), using two functional group active diluents for linear and network mixed superposition cross-linking can form a dense barrier layer with certain nano-scale gaps between the outer layer of the gel and the outer layer of the photonic crystal color-changing film ( Figure 4 ). Therefore, during the smoking process of cigarettes, when the temperature rises slowly, the aroma-carrying composite ball melts, and the aroma molecules can flow through the micropores of the cross-linked structure, thereby entering the smoke to supplement the aroma. Therefore, during the smoking process of cigarettes, as the temperature of the filter rod rises, the aroma-releasing color-changing gel ball of the present invention can produce a color-changing effect and release aroma at the same time, providing smokers with richer smoking sensory quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the fragrance-releasing color-changing gel ball of the present invention.

[0030] Figure 2 Prepare a mold for the fragrance-carrying composite ball.

[0031] Figure 3 It is the formula curing reaction formula of the resin photocuring layer.

[0032] Figure 4 It is a light-cured membrane fiber structure.

[0033] Figure 5 Schematic diagram of photonic crystal film polymerization.

[0034] Figure 6 The following are the physical picture and SEM picture of the photonic crystal film.

[0035] Figure 7 The utility model relates to a ternary visualized cavity filter rod structure having the fragrance-releasing color-changing gel balls of the present invention. DETAILED DESCRIPTION

[0036] The technical solution of the present invention is further described below in conjunction with specific implementation methods. It should be noted that the following examples are only used to illustrate and explain the present invention in detail, and the application scope of the present invention is not limited by the conditions in the examples.

[0037] like Figure 1 As shown, the fragrance-releasing color-changing gel ball has a particle size of 3.2-3.6 mm, changes color with temperature and can release fragrance molecules. The fragrance-releasing color-changing gel ball includes a core, an intermediate layer and an outer layer; wherein the core includes a fragrance-carrying composite ball and a composite ball protective layer, the intermediate layer is a photonic crystal film layer, and the outer layer is a gel ball protective layer; the composite ball protective layer and the gel ball protective layer are both photocurable resin film layers, and the thickness of the photocurable resin film layer is 20-35 μm. The thickness of the photonic crystal film layer is 20-35 μm, which is a film layer formed by the arrangement and aggregation of multiple core-shell structure particles, the particle size of the particles is 170-300 nm, and the thickness of the particle shell is 20-50 nm; the particles are monodisperse latex particles, and their polydispersity index is not greater than 0.005, and the glass transition temperature of the core polymer of the particles is greater than the glass transition temperature of the shell polymer; the arrangement and aggregation mode of the particles in the photonic crystal film layer and the gaps between the particles change with temperature.

[0038] The preparation method of the fragrance-releasing color-changing gel ball of the present invention comprises the following steps:

[0039] Step 1, preparing the flavor-carrying composite ball: weighing 20-50 g of guava, lemon and kiwi fruit dry slice samples with the middle seed removed and baked in a weight ratio of 2:0.5:1.2, adding 70 wt% ethanol in a material-liquid mass ratio of 1:5, and performing hot reflux extraction twice at a temperature of 65° C., each extraction time of 2 hours; cooling the extract to room temperature, filtering with a 200-mesh filter cloth and standing for 24 hours; filtering by suction, concentrating in a vacuum, and preparing a fruit mixture extract;

[0040] The polyethylene glycol, chitosan, sodium carboxymethyl cellulose, starch, pectin, sodium alginate and β-cyclopaste are mixed in a mass ratio of 16:0.5:1:0.2:0.1:0.4:0.5 to obtain a flavoring substance; the fruit extract extract and the flavoring substance are prepared in a mass ratio of 1:5, and then water is added in a mass ratio of 4:1, and a magnetic stirring is performed at a stirring speed of 250rpm to fully emulsify the extract; the emulsified product is mixed with PEG1500 and PEG4000 (PEG1500 and PEG4000 mass ratio) in a mass ratio of 1:3. The mixture is stirred at a temperature of 55-65° C. for 0.5-0.75 h to make it fully mixed and uniform, and a temperature-induced phase change composite colloid with a melting point of 45-55° C. is obtained; then, a flavor and a solvent are added at a magnetic stirring speed of 500 rpm and a temperature of 55-60° C., wherein the solvent is preferably a mixture of propylene glycol fatty acid ester and glyceryl caprylate, and the added amounts are: the flavor, propylene glycol fatty acid ester and glyceryl caprylate account for 15%, 1% and 1.5% of the weight of the composite colloid, respectively, to obtain a finished flavor-carrying composite gel;

[0041] The finished fragrance-carrying composite gel is dripped with a dropper; the dropper is a funnel-shaped or dropper mold with a diameter of 3mm to 4mm. The dripping speed of the finished composite gel is controlled by manually adjusting the opening and closing of the nozzle or the tube mouth, and dripping into the spherical mold with a diameter of 3.2-3.6mm (see Figure 2 ), and then put the spherical mold wrapped with the finished product of the fragrance-carrying composite gel into a refrigerator at 0-4°C for 1.5-2 hours to ensure that the finished product solidifies into a sphere without being destroyed; that is, the fragrance-carrying composite ball is obtained;

[0042] Step 2: Preparation of the formulation colloid of the photocurable resin film layer: using a laboratory flat-bottom disposable centrifuge tube as a container, adding 52.5wt% of epoxy resin acrylated epoxidized soybean oil (AESO), 12.2wt% of IBOA, 10.1wt% of HDDA, and 25.2wt% of butyl acetate according to the mass that the centrifuge tube can hold; mixing evenly on a stirring table; adding a photoinitiator, preferably Irgacure184, in an amount of 6wt% of the mass of the polymer monomer, and stirring on the stirring table, after the initiator is completely dissolved, a photocurable epoxy resin colloid formulation is obtained;

[0043] Step 3: solidify and shape to obtain the core; take out the fragrance-carrying composite ball prepared in step 1 from the mold, dry the excess liquid on the surface of the fragrance-carrying composite ball with a paper towel, and then place the fragrance-carrying composite ball in a glass surface dish; pour the photocurable epoxy resin colloid formula obtained in step 2 into the above-mentioned surface dish, ensure that the fragrance-carrying composite ball is completely immersed in the formula colloid, and ensure that the fragrance-carrying composite ball is completely wrapped by the formula colloid; then take out the fragrance-carrying composite balls from the glass surface dish one by one and place them on a polytetrafluoroethylene plate, wipe off the excess resin deposited on the polytetrafluoroethylene plate, and place them in a shaking table; turn on the shaking table, roll the fragrance-carrying composite ball in the polytetrafluoroethylene plate at the maximum speed for nearly half a minute, then turn on the LED lamp with a wavelength of 365nm, and irradiate continuously for 90s; after the film layer is cured, a solidified spherical core is obtained; wherein the thickness of the photocurable resin film layer is about 50nm, which provides a smooth spherical surface for subsequent photonic crystal film attachment.

[0044] Step 4: preparing an emulsion of particles with a core-shell structure; dispersing 10 g of styrene, 7 g of methyl styrene, 0.5 g of acrylic acid, 0.5 g of ethyl acrylate, 0.5 g of ammonium bicarbonate as a pH buffer, and 4.2-9.0 mg of sodium dodecyl phenyl cyclopentane as an emulsifier in 100 ml of a deionized water solution; stirring with a magnetic force of 300-800 rpm and heating to 70-80° C.; dissolving 1 g of potassium persulfate in 40 ml of water, pouring it into the above solution for reaction, and pouring 5 ml every 5 hours for three polymerization reactions. After the polymerization reaction is completed, particles with a core of a polymer polystyrene having a higher glass transition temperature (Tg) and a shell of a polymer polyacrylic acid having a lower glass transition temperature (Tg) are obtained; the particle size range is 170-300 nm (see Figure 1 and Figure 5 ), the polydispersity coefficient is not greater than 0.005; the preparation of the emulsion with core-shell structure particles in this step can refer to the prior art;

[0045] Step 5: at room temperature, the latex obtained in step 4 is mixed with a colloidal solution having a concentration of 5 wt % and put into a pneumatic spray gun, the solvent being a 95 % ethanol solution; air spraying is adopted, and the spraying parameters are as follows: the air pump pressure is 0.49-0.55 MPa, the distance between the spray gun mouth and the solidified core ball is 25-30 cm, and the time taken to spray each core ball is 4-5 seconds; after the spraying, the core ball is left to stand at 25-30° C. for 2-4 hours, waiting for the photonic crystal particles to "self-assemble", that is, spontaneously aggregate into a stable, regular geometric appearance structure to form a film based on the interaction of non-covalent bonds; during this period, it is necessary to ensure that there is no air flow around the sphere; a sphere with a photonic crystal film layer is obtained, such as Figure 6 As shown;

[0046] Step 6: Spray the sphere with the photonic crystal film layer in step (5) with the formula colloid of the photocurable resin film layer in step (2), and the spraying process is the same as step 5; after drying at room temperature, roll the plate over, and spray the other side, and the spraying process is the same; repeat the spraying four times to wrap the entire sphere without gaps; after spraying, irradiate with EFOSlite 50W ultraviolet point light source in a shaking table, and the energy of the point light source is 32mW / cm 2 , the irradiation time is 300s, the shaking speed is 100-200rpm; the fragrance-releasing color-changing gel ball is obtained; Figure 1 shown.

[0047] The obtained scent-releasing color-changing gel balls are compounded with the ternary cavity filter rod. Prepare the required auxiliary materials in advance, including bursting beads, transparent forming paper, acetate base rods, and joint glue. The steps are: load the materials onto the machine, and carry out equipment debugging and trial production according to the requirements of the filter rod design specification. When all product indicators meet the requirements, start collecting the produced filter rods; filter rod length (L) = L1 (first part of the filter rod) + L2 (visible transparent section) + L3 (second part of the filter rod) (such as Figure 7 As shown in the figure). In order to deal with the sticking of filter rods during the forming process, the process can be adjusted during the forming process of the filter rods. By strictly controlling the position of the glue line, that is, the glue line position is 1mm away from the edge of the transparent forming paper, the hot melt adhesive will not penetrate out after cooling and place, causing sticking at the glue line. Control the packing quantity, such as packing one less row of filter rods to reduce the squeezing between the filter rods; and the sticking of the paper segment can be reduced by controlling the coating amount of the wetting agent.

[0048] When the cigarette with the filter rod is smoked, a light color transition from blue-green to yellow-green and a smoke with a refreshing natural fruity aroma can be presented.

[0049] The fragrance-releasing color-changing gel ball of this embodiment shows a color shift (Δλ) in the temperature range of 45-70°C. max =28±1nm), and at the same time exhibited a significant colorimetric response (ΔE*>1.5) in this temperature range, and its thermochromic response time was less than 5 seconds.

[0050] The above description is only used to introduce the specific implementation methods of the present invention in detail, but the technical solution proposed by the present invention is not limited to the above method. Without departing from the basic principles of the present technology, equivalent modifications and changes made by those skilled in the art to the technology proposed by the present invention should be included in the scope of the claims of the present invention.

Claims

1. A gel ball capable of releasing fragrance and changing color, characterized in that: Its particle size is 3.2-3.6mm, its color changes with temperature and it can release aroma molecules.

2. The fragrance-releasing color-changing gel ball according to claim 1, characterized in that: The fragrance-releasing color-changing gel ball comprises a core, an intermediate layer and an outer layer; wherein the core comprises a fragrance-carrying composite ball and a composite ball protective layer, the intermediate layer is a photonic crystal film layer, and the outer layer is a gel ball protective layer; the composite ball protective layer and the gel ball protective layer are both photocurable resin film layers, and the thickness of the photocurable resin film layer is 20-35 μm.

3. The fragrance-releasing color-changing gel ball according to claim 2, characterized in that: The thickness of the photonic crystal film layer is 20-35 μm, and it is a film layer formed by the arrangement and aggregation of multiple core-shell structured particles. The particle size of the particles is 170-300 nm, wherein the thickness of the particle shell is 20-50 nm; the particles are monodisperse latex particles, and their polydispersity index is not greater than 0.005, and the glass transition temperature of the core polymer of the particles is greater than the glass transition temperature of the shell polymer; the arrangement and aggregation mode of the particles in the photonic crystal film layer and the gaps between the particles change with temperature.

4. The method for preparing the fragrance-releasing color-changing gel ball according to any one of claims 1 to 3, characterized in that: The steps include: (1) preparing a fragrance-carrying composite ball; (2) preparing a formulation colloid of a photocurable resin film layer; (3) wrapping the formulated colloid of the light-curable resin film layer of step (2) on the surface of the fragrance-carrying composite ball of step (1), and then irradiating it with near-ultraviolet light in a shaking table to cure and shape it to obtain the core; (4) preparing an emulsion having core-shell structured particles; (5) spraying the emulsion of the core-shell structured particles obtained in step (4) onto the surface of the core obtained in step (3), and then standing at a certain temperature for a period of time to obtain the photonic crystal film layer; (6) Spraying the formulated colloid of the photocurable resin film layer of step (2) onto the surface of the photonic crystal film layer obtained in step (5), and then irradiating it with an ultraviolet point light source in a shaking incubator for a period of time to obtain the fragrance-releasing color-changing gel spheres.

5. The preparation method according to claim 4, characterized in that: The preparation method of the fragrance-carrying composite ball in step (1) is as follows: the plant extract, essence, solvent and fragrance-carrying material are mixed, and then dripped into a spherical mold with a diameter of 3.2-3.6 mm at a certain rate with a dropper, and refrigerated for a period of time to obtain the fragrance-carrying composite ball.

6. The preparation method according to claim 4, characterized in that: The formulation of the photocurable resin film layer in step (2) comprises: epoxy resin monomer, IBOA, HDDA, butyl acetate and photoinitiator; wherein the mass ratio of epoxy resin monomer, IBOA, HDDA and butyl acetate is 52.5:12.2:10.1:25.2; and the photoinitiator is (4-8)% of the mass of the polymer monomer; The method of wrapping the surface of the fragrance-carrying composite ball with the formulated colloid of the photocurable resin film layer in step (3) is as follows: completely immersing the fragrance-carrying composite ball in the formulated colloid of the photocurable resin film layer, with the shaking speed of 100-200 rpm, the near-ultraviolet light of 360-370 nm, and the irradiation time of 1-2 min.

7. The preparation method according to claim 4, characterized in that: Step (4) The preparation step of the emulsion of the core-shell structure particles is as follows: monomer 1 and monomer 2 are mixed and dispersed in an aqueous solution containing a pH buffer and an emulsifier, and 1 / 2 of the total amount of initiator is added at 70-80° C. while stirring at a speed of 300-800 rpm to start the reaction, and 1 / 4 of the total amount of initiator is added after 2-5 hours, and the remaining initiator is added after 2-5 hours to obtain the emulsion of the core-shell structure particles; The glass transition temperature of monomer 1 is greater than the glass transition temperature of monomer 2.

8. The preparation method according to claim 4, characterized in that: The spraying in step (5) or step (6) is carried out by air spraying; The spraying parameters are: the air pump pressure is 0.49-0.55MPa, the distance between the spray gun mouth and the surface of the core is 25-30cm; the time used for spraying each core is 4-5 seconds.

9. The preparation method according to claim 4, characterized in that: The energy of the UV point light source in step (6) is 32 mW / cm 2 , irradiation time was 300s, and the shaking speed was 100-200rpm.

10. Use of the flavor-releasing color-changing gel ball according to any one of claims 1 to 3 in cigarette filter rods.

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