Multilayer coated particles for cosmetics with color correction function and preparation method and application thereof

Abstract

The application discloses a multi-layer coated particle with color correction function for cosmetics and a preparation method and application thereof, wherein the particle has a core-shell structure and comprises, from inside to outside, a core layer, a skin color base layer, a first transition layer, a concealing and lightening layer, a second transition layer and an appearance color-changing layer; the raw materials of the first transition layer and the second transition layer comprise hydroxypropyl starch, beta-cyclodextrin and hydrogenated lecithin. Through specific 'brown-white-blue' layer sequence design and interlayer transition bonding technology, the application realizes the color-changing effect of the product, i.e., the product has a blue appearance and is changed into a natural skin color after being applied, and has excellent concealing function and structural stability. The application also provides a preparation method of the multi-layer coated particle with color correction function for cosmetics and application thereof in cosmetics such as foundation, BB cream and concealing cream.

Description

Technical Field

[0001] This invention belongs to the field of cosmetic technology, specifically relating to a multi-layer coated particle for cosmetics with color-changing function, its preparation method, and its application. Background Technology

[0002] As consumers increasingly demand better user experience and visual appeal from cosmetics, color-changing cosmetic particles are gaining more and more market attention. These particles are one color in the product and change to another color after application, adding not only fun to the product but also providing instant skin tone correction and concealing effects.

[0003] Existing technologies have reported multi-layered coated particles and color-changing particles. For example, CN112120943A discloses spherical color-changing particles for foundation, in which a film-forming slurry is coated onto the surface of the spherical core using a fluidized bed coating machine, achieving a skin tone correction effect when used in foundation. Furthermore, PCT / KR2017 / 014178 discloses a multi-layered capsule, which forms a multi-layered structure by repeatedly coating the core material. Its purpose is to block the internal pigments and functional ingredients from the effects of light and oxygen, and to allow the capsule to rupture and reveal color during use through friction.

[0004] However, existing color-changing particles still have the following shortcomings: First, the color-changing mechanism is relatively simple, resulting in an unnatural color transition. Existing technologies typically rely on the mixing of colors inside and outside the particles after they break down to achieve color change, or use a single-layer mixture of multiple pigments. This fails to create a gradient effect that "first presents a pure blue color, then gradually transforms into skin tone." In a single-layer mixed structure, blue, white, and brown pigments interfere with each other, causing the product to appear grayish-blue rather than a vibrant blue, and after the color change, it exhibits a grayish tone rather than a natural skin tone, resulting in poor concealing effect.

[0005] Second, the lack of interlayer optical synergy design results in poor concealing effect. Existing multi-layer encapsulation structures often only consider pigment protection and do not fully utilize the optical synergy between layers to optimize concealing effect. Specifically, there is no separate concealing and brightening layer (white layer) and skin tone base layer (brown layer), nor are there transition structures between layers to prevent pigment migration, resulting in uneven skin tone and poor brightening effect after color change.

[0006] Third, multi-layer coatings are prone to peeling and have poor structural stability. In existing technologies, adjacent color layers are directly stacked without effective interlayer bonding design, which leads to problems such as interlayer peeling and pigment migration during transportation and use, seriously affecting the stability of the product's appearance and color-changing function.

[0007] Fourth, the fragrance experience lacks innovation, and the fragrance is volatile. Most existing products use direct spraying of fragrance, which is easily lost through volatilization during storage and may react adversely with cosmetic bases or pigments, affecting product stability and user experience.

[0008] Therefore, there is an urgent need to develop a new type of color-changing particle that is structurally stable, has controllable color change, excellent concealing properties, and a good skin feel. Summary of the Invention

[0009] To address the aforementioned technical problems, this invention provides a multi-layered coated particle for cosmetics with color-changing function, its preparation method, and its application. The particle exhibits a unique blue appearance in the product and can quickly transform into skin color after application, providing excellent concealing and skin tone correction effects.

[0010] To achieve the above objectives, the present invention adopts the following technical solution: The first objective of this invention is to provide a multi-layered coated particle for cosmetics with a color-changing function, the particle having a core-shell structure and comprising, from the inside out: Core layer, skin tone base layer, first transition layer, concealer and brightening layer, second transition layer, and color-changing layer; The raw material for the core layer is a monosaccharide-polyol; The skin tone base layer is coated on the surface of the core layer, and the raw materials of the skin tone base layer include CI 77492, CI 77491 and CI 77499; The first transition layer is disposed between the skin tone base layer and the concealer / brightening layer; The second transition layer is disposed between the concealer and brightening layer and the appearance color-changing layer; The color-changing layer is coated on the surface of the second transition layer; The raw materials for the first transition layer and the second transition layer each independently include hydroxypropyl starch, β-cyclodextrin, and hydrogenated lecithin.

[0011] The applicant's research found that through the synergistic effect of the following technical features, the color-changing particles of the present invention achieve a visual effect of naturally changing from blue to skin color after application, while also possessing excellent concealing function, smooth skin feel, and long-lasting fragrance experience, specifically manifested as: (1) a core-shell structure design with specific layers: from the inside out, the layers are core-skin tone layer (brown)-concealing and brightening layer (white)-appearance color-changing layer (blue), achieving a color-changing effect of "appearing blue in the product and changing to natural skin color after application and rubbing"; (2) interlayer transition layer design: transition layers are respectively set between the skin tone layer and the concealing and brightening layer, and between the concealing and brightening layer and the appearance color-changing layer, the interlayer transition layer The raw materials for the coating layer include a complex system of hydroxypropyl starch, β-cyclodextrin, and hydrogenated lecithin, which effectively prevents pigment migration, ensures uniform color change, and optimizes interlayer bonding strength, achieving a balance between "structural integrity during transportation and controllable breakage during application." The principle may be as follows: hydroxypropyl starch provides film-forming properties and mechanical strength, and the hydroxypropyl groups on its molecular chain can form hydrogen bonds with the iron oxide pigments in the brown layer, enhancing interfacial bonding; the cavity structure of β-cyclodextrin can partially encapsulate free pigment molecules on the surface of the brown layer, preventing color migration to the white layer; hydrogenated lecithin, as an emulsifying and dispersing agent, improves the wetting and spreading properties of the slurry on the hydrophobic brown layer surface, ensuring a uniform and dense transition layer.

[0012] Furthermore, the monosaccharide-polyol is selected from mannitol, erythritol, xylitol, sorbitol and mixtures thereof, preferably mannitol; Furthermore, the core layer has a particle size of 60-150 mesh; Specifically, the core layer has a particle size of 60 mesh, 70 mesh, 80 mesh, 90 mesh, 100 mesh, 110 mesh, 120 mesh, 130 mesh, 140 mesh, or 150 mesh. Furthermore, the particle size of the multi-layer coated particles for cosmetics with color-changing function is 80-200 mesh; Specifically, the particle size of the multi-layer coated particles for cosmetics with color-changing function is 80 mesh, 90 mesh, 100 mesh, 110 mesh, 120 mesh, 130 mesh, 140 mesh, 150 mesh, 160 mesh, 170 mesh, 180 mesh, 190 mesh, and 200 mesh. Furthermore, the surface of the core layer is also covered with a bottom bonding reinforcement layer, the raw material of which includes hydroxypropyl methylcellulose; Furthermore, the weight gain of the bottom bonding reinforcement layer is 0.8-1.2% of the weight of the core layer; Specifically, the weight gain of the bottom bonding reinforcement layer is 0.8%, 0.9%, 1.0%, 1.1%, and 1.2% of the weight of the core layer; Furthermore, the raw materials of the skin tone base layer include CI 77492, CI 77491, CI 77499, hydrogenated lecithin, and corn starch; Further, the mass ratio of CI 77492, CI 77491, CI 77499, hydrogenated lecithin, and corn starch is (20-30):(3-8):(0.3-1):(1-3):(2-4); Preferably, the mass ratio of CI 77492, CI 77491, CI 77499, hydrogenated lecithin, and corn starch is (23-27):(4-6):(0.4-0.6):(1.5-2.5):(2-4); More preferably, the mass ratio of CI 77492, CI 77491, CI 77499, hydrogenated lecithin, and corn starch is 25:5:0.5:2:3; Furthermore, the weight increase of the skin tone base layer is 8-12% of the weight of the core layer; Specifically, the weight increase of the skin tone base layer is 8%, 9%, 10%, 11%, and 12% of the weight of the core layer; Furthermore, the raw materials of the concealer and brightening layer include CI 77891, hydrogenated lecithin, and corn starch; Furthermore, the mass ratio of CI 77891, hydrogenated lecithin, and corn starch is (20-30):(2-3):(1.5-2.5); Preferably, the mass ratio of CI 77891, hydrogenated lecithin, and corn starch is (23-27):(2.3-2.7):(1.8-2.2). More preferably, the mass ratio of CI 77891, hydrogenated lecithin, and corn starch is 25:2.5:2; Furthermore, the weight increase of the concealer and brightening layer is 10-15% of the weight of the core layer; Specifically, the weight increase of the concealer and brightening layer is 10%, 11%, 12%, 13%, 14%, or 15% of the weight of the core layer; Furthermore, in the first transition layer, the mass ratio of hydroxypropyl starch, β-cyclodextrin, and hydrogenated lecithin is (2-4):(1-3):(0.5-1.5); Preferably, the mass ratio of hydroxypropyl starch, β-cyclodextrin, and hydrogenated lecithin is (2.5-3.5):(1.5-2.5):(0.5-1.5). More preferably, the mass ratio of hydroxypropyl starch, β-cyclodextrin, and hydrogenated lecithin is 3:2:1; Further, the degree of substitution of the hydroxypropyl starch is 0.4-0.8; preferably, the degree of substitution of the hydroxypropyl starch is 0.5-0.7; more preferably, the degree of substitution of the hydroxypropyl starch is 0.6. Furthermore, the weight increase of the first transition layer is 2-4% of the weight of the core layer; Specifically, the weight increase of the first transition layer is 2%, 2.5%, 3%, 3.5%, and 4% of the weight of the core layer; Furthermore, the raw material for the second transition layer also includes nano-silica; Compared with the first transition layer, the second transition layer has added nano-silica as a mechanical reinforcing filler in its raw materials. Its nano-sized particles can fill the micropores after the hydroxypropyl starch film is formed, improving the interlayer density and wear resistance. The abundant silanol groups on the surface of nano-silica can form Si-O-Ti bonds with the surface of titanium dioxide, enhancing the chemical bonding between the white layer and the transition layer. Preferably, the nano-silica is nano-silica prepared by a gas-phase method, with a specific surface area of ​​200±25m². 2 / g; Furthermore, in the second transition layer, the mass ratio of hydroxypropyl starch, β-cyclodextrin, hydrogenated lecithin, and nano-silica is (1-3):(1-2):(0.5-1):(0.2-0.5); Preferably, in the second transition layer, the mass ratio of hydroxypropyl starch, β-cyclodextrin, hydrogenated lecithin, and nano-silica is (1.5-2.5):(1-2):(0.6-1):(0.2-0.4). More preferably, in the second transition layer, the mass ratio of hydroxypropyl starch, β-cyclodextrin, hydrogenated lecithin, and nano-silica is 2:1.5:0.8:0.3; Furthermore, the weight increase of the second transition layer is 2-3% of the weight of the core layer; Specifically, the weight increase of the second transition layer is 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, or 3% of the weight of the core layer. Furthermore, the color-changing layer comprises CI 74160, hydrogenated lecithin, and hydroxypropyl starch; Furthermore, the mass ratio of CI 74160, hydrogenated lecithin, and hydroxypropyl starch is (2-4):(1-2):(0.5-1.5); Preferably, the mass ratio of CI 74160, hydrogenated lecithin, and hydroxypropyl starch is (2.5-3.5):(1.3-1.7):(0.8-1.2). More preferably, the mass ratio of CI 74160, hydrogenated lecithin, and hydroxypropyl starch is 3:1.5:1; Furthermore, the weight increase of the color-changing outer layer is 2.5-6% of the weight of the core layer; Specifically, the weight increase of the color-changing outer layer is 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, and 6% of the weight of the core layer; Furthermore, the multi-layered coated particles for cosmetics with color-correcting function also include a fragrance-releasing layer; Furthermore, the aroma-slow-release layer is coated on the surface of the appearance-changing layer; Furthermore, the raw materials for the aroma sustained-release layer include plant essential oil-β-cyclodextrin inclusion complex or slightly acidic oil core; Furthermore, the aroma-releasing layer also includes hydroxypropyl starch as a raw material. Furthermore, the mass ratio of the plant essential oil-β-cyclodextrin inclusion complex to hydroxypropyl starch is (2-4):(0.3-0.8); Preferably, the mass ratio of the plant essential oil-β-cyclodextrin inclusion complex to hydroxypropyl starch is (2.5-3.5):(0.4-0.6); More preferably, the mass ratio of the plant essential oil-β-cyclodextrin inclusion complex to hydroxypropyl starch is 3:0.5; The plant essential oils include one or more of the following: citrus essential oils, floral essential oils, herbal essential oils, woody essential oils, and tea-scented fragrances; Specifically, the plant essential oils include one or more of the following: sweet orange essential oil, rose essential oil, jasmine essential oil, lavender essential oil, sandalwood essential oil, and green tea fragrance; Furthermore, the micro-acid oil-purifying core is selected from plant essential oil microcapsules or fragrance microcapsules, which are used to provide a continuous aroma release effect for the particles, while also having certain antioxidant and soothing effects; Furthermore, the weight gain of the aroma-releasing layer is 1.5-2.5% of the weight of the core layer; Specifically, the weight gain of the aroma-releasing layer is 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, 2.4%, and 2.5% of the weight of the core layer.

[0013] A second objective of this invention is to provide a method for preparing the above-mentioned multi-layer coated particles for cosmetics with color-changing function, the method comprising the following steps: (1) Preparation of the core layer; (2) In a fluidized bed, a skin tone base layer slurry is sprayed onto the surface of the core layer to form a skin tone base layer; (3) In a fluidized bed, the first transition layer slurry is sprayed onto the surface of the skin tone base layer to form the first transition layer; (4) In a fluidized bed, the concealer and brightening layer slurry is sprayed onto the surface of the first transition layer to form a concealer and brightening layer; (5) In a fluidized bed, the second transition layer slurry is sprayed onto the surface of the concealer and brightening layer to form the second transition layer; (6) In a fluidized bed, the appearance color-changing layer slurry is sprayed onto the surface of the second transition layer to form an appearance color-changing layer; (7) In a fluidized bed, the aroma slow-release layer slurry is sprayed onto the surface of the appearance color-changing layer to form an aroma slow-release layer. After drying and sieving, the finished product is obtained. The raw materials for the first transition layer and the second transition layer each independently include hydroxypropyl starch, β-cyclodextrin, and hydrogenated lecithin.

[0014] Further, in step (1), the preparation method of the core layer is as follows: mannitol is prepared into an aqueous solution of 30-40wt%, and spherical mannitol core layer is prepared by spray drying, and the portion with a particle size range of 60-150 mesh is collected by sieving. Further, step (1) also includes: placing the obtained core layer in a fluidized bed and pre-coating it with a 0.5-1.0 wt% aqueous solution of hydroxypropyl methylcellulose to increase its weight by 0.8-1.2% and form a bottom bonding reinforcement layer; Further, in step (2), CI 77492, CI 77491, CI 77499, hydrogenated lecithin and corn starch are taken and purified water is used as the dispersion medium to prepare a skin tone base layer slurry. The solid content of the skin tone base layer slurry is 25-35%, the air inlet temperature is 50-70℃ and the material temperature is 40-50℃ during spraying. Further, the mass ratio of CI 77492, CI 77491, CI 77499, hydrogenated lecithin, and corn starch is (20-30):(3-8):(0.3-1):(1.5-2.5):(2-4); the weight gain of the skin tone base layer is 8-12% of the weight of the core layer; Further, in step (3), hydroxypropyl starch, β-cyclodextrin and hydrogenated lecithin are taken and purified water is used as the dispersion medium to prepare the first transition layer slurry. The solid content of the first transition layer slurry is 15-20%, the air inlet temperature is 45-60℃ and the material temperature is 35-45℃ during spraying. Furthermore, in the first transition layer, the mass ratio of hydroxypropyl starch, β-cyclodextrin, and hydrogenated lecithin is (2-4):(1-3):(0.5-1.5), and the weight gain of the first transition layer is 2-4% of the weight of the core layer; Further, in step (4), CI 77891, hydrogenated lecithin and corn starch are taken and purified water is used as the dispersion medium to prepare a concealing and brightening layer slurry. The solid content of the concealing and brightening layer slurry is 25-35%, the air inlet temperature is 50-70℃ and the material temperature is 40-50℃ during spraying. Furthermore, the raw materials of the concealer and brightening layer include CI 77891, hydrogenated lecithin, and corn starch, and the mass ratio of CI 77891, hydrogenated lecithin, and corn starch is (20-30):(2-3):(1.5-2.5); the weight gain of the concealer and brightening layer is 10-15% of the weight of the core layer. Further, in step (5), hydroxypropyl starch, β-cyclodextrin, hydrogenated lecithin and nano silica are taken and purified water is used as the dispersion medium to prepare a second transition layer slurry. The solid content of the second transition layer slurry is 15-20%, the air inlet temperature is 45-60℃ and the material temperature is 35-45℃ during spraying. Further, the mass ratio of hydroxypropyl starch, β-cyclodextrin, hydrogenated lecithin, and nano-silica is (1.5-2.5):(1-2):(0.5-1):(0.2-0.5), and the weight gain of the second transition layer is 2-3% of the weight of the core layer; Further, in step (6), CI 74160, hydrogenated lecithin and hydroxypropyl starch are taken and purified water is used as the dispersion medium to prepare an appearance color-changing layer slurry. The solid content of the appearance color-changing layer slurry is 18-25%, the air inlet temperature is 45-55℃ and the material temperature is 35-45℃ during spraying. Furthermore, the mass ratio of CI 74160, hydrogenated lecithin, and hydroxypropyl starch is (2-4):(1-2):(0.5-1.5), and the weight gain of the color-changing layer is 2.5-6% of the weight of the core layer; Further, in step (7), plant essential oil-β-cyclodextrin inclusion complex and hydroxypropyl starch are taken and used as ethanol-water as dispersion medium to prepare aroma sustained-release layer slurry; Furthermore, in a fluidized bed, the aroma-slow-release layer slurry is sprayed onto the surface of the appearance color-changing layer to form an aroma-slow-release layer. During spraying, the inlet air temperature is 30-40℃ and the material temperature is 20-30℃. Furthermore, the mass ratio of the plant essential oil-β-cyclodextrin inclusion complex to hydroxypropyl starch is (2-4):(0.3-0.8); Furthermore, the weight gain of the aroma-releasing layer is 1.5-2.5% of the weight of the core layer; Further, the preparation method of the plant essential oil-β-cyclodextrin inclusion complex includes: taking 10 parts of β-cyclodextrin, adding 100 parts of purified water, heating to 50°C and stirring to dissolve, then slowly adding 2 parts of plant essential oil, stirring at a constant temperature of 50°C for 4 hours, cooling to room temperature, standing for 12 hours to allow the inclusion complex to crystallize, filtering, and vacuum drying to obtain the plant essential oil-β-cyclodextrin inclusion complex; Furthermore, after the aroma-releasing layer slurry is sprayed, it is further fluidized at room temperature (20-25°C) for 5-10 minutes for low-temperature setting. Furthermore, the drying temperature is 35-40℃, and the drying is carried out until the moisture content is ≤3%.

[0015] A third objective of this invention is to provide the application of the aforementioned multi-layered coated particles with color-correcting function in the preparation of cosmetics.

[0016] The cosmetics mentioned include foundation, BB cream, CC cream, makeup base, or concealer, etc.

[0017] The beneficial effects of this invention are: Compared with the prior art, the present invention has the following beneficial effects: (1) This invention achieves a time-sequential color-changing effect by designing a specific core-shell layer sequence of "blue layer-white layer-brown layer," which transforms the product from a blue appearance to a skin tone after application and rubbing. The color-changing time is controllable, the color change is uniform, the concealing effect is excellent, and the skin feel is good. In addition, the specific layer sequence of "blue layer on the outermost layer and brown layer on the innermost layer" is a necessary technical feature to achieve the purpose of the invention: the reverse layer sequence cannot present a blue appearance at all, and the color-changing function fails.

[0018] (2) The setting of the first and second transition layers is the key to achieving "controllable color change" in this invention: without the transition layer, the interlayer bonding strength is low, the transportation damage rate is high, and the color change is uneven; using a single auxiliary material cannot achieve the comprehensive effect of this invention. The transition layer of this invention adopts a three-component compound system of hydroxypropyl starch, β-cyclodextrin and hydrogenated lecithin. Hydroxypropyl starch provides film-forming properties and mechanical strength, β-cyclodextrin encapsulates free pigments to prevent migration, and hydrogenated lecithin improves the wetting and spreading properties of the slurry. The three components work synergistically.

[0019] (3) The aroma sustained-release design of plant essential oil-β-cyclodextrin inclusion complex is the key to achieving long-lasting aroma in this invention: direct spraying of rose essential oil results in rapid aroma evaporation; while the aroma retention rate is significantly improved after using β-cyclodextrin inclusion complex.

[0020] (4) The color-changing particles of the present invention have a smooth and delicate feel, high adhesion to the skin, and do not float or become greasy.

[0021] (5) The color-changing particles of the present invention have excellent storage stability and maintain good color-changing function and concealing effect after 6 months of accelerated testing. Attached Figure Description

[0022] Figure 1 This is a photograph of the product from Example 1. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Experimental methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or as recommended by the manufacturer. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those familiar with the art. Furthermore, any methods and materials similar to or equivalent to those described herein can be applied to the methods of the present invention. The preferred embodiments and materials described herein are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. In the description of this application, it should be understood that "and / or" describes the relationship between related objects, indicating that three relationships may exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural.

[0025] Unless otherwise specified, the experimental and detection methods described in each embodiment are conventional methods; unless otherwise specified, the reagents and raw materials are commercially available.

[0026] Example 1 This embodiment provides a multi-layered coated particle for cosmetics with color-correcting function, the preparation method of which includes the following steps: (1) Preparation of mannitol core layer Mannitol was prepared into a 35% aqueous solution, and spherical mannitol cores were prepared by spray drying. The fraction with a particle size range of 60-150 mesh was collected by sieving. The obtained mannitol cores were placed in a fluidized bed and pre-coated with a 1.0% aqueous solution of hydroxypropyl methylcellulose (HPMC, viscosity 5 cps) to increase the weight by 1.0%, forming the bottom bonding and reinforcing layer.

[0027] (2) Coating of the skin tone base layer (brown layer) Take 25 parts of CI 77492, 5 parts of CI 77491, and 0.5 parts of CI 77499, and mix them thoroughly. Then add 2 parts of hydrogenated lecithin and 3 parts of corn starch, and use an appropriate amount of purified water as the dispersion medium. Disperse the mixture evenly by high-speed shearing to prepare a skin-toned base layer slurry with a solid content of 30%.

[0028] The mannitol cores pretreated in step (1) were added to a fluidized bed coating machine. The inlet air temperature was set to 60°C and the material temperature was controlled at 45°C. The skin-toned base layer slurry was evenly sprayed onto the core surface using a bottom spray mode. After coating, the cores were dried in the fluidized bed for 15 minutes, and the weight gain of the skin-toned base layer was controlled to be 10% of the core weight.

[0029] (3) Coating of the first transition layer Take 3 parts of hydroxypropyl starch (degree of substitution 0.6), 2 parts of β-cyclodextrin, and 1 part of hydrogenated lecithin, and prepare a first transition layer slurry with a solid content of 18% with an appropriate amount of purified water.

[0030] The particles obtained in step (2) are placed in a fluidized bed, the air inlet temperature is set to 50°C and the material temperature is set to 40°C. The first transition layer slurry is sprayed in the bottom spray mode to form the first transition layer, which increases the weight by 3% of the core weight.

[0031] (4) Coating of concealer and highlighter layer (white layer) Take 25 parts of CI 77891 (titanium dioxide), add 2.5 parts of hydrogenated lecithin and 2 parts of corn starch, and prepare a concealer and brightening layer paste with a solid content of 30% with an appropriate amount of purified water.

[0032] The particles obtained in step (3) are placed in a fluidized bed, the air inlet temperature is set to 60°C and the material temperature is set to 45°C. The concealer and brightening layer slurry is sprayed in the bottom spray mode to form a concealer and brightening layer, which increases the weight to 12% of the core weight.

[0033] (5) Coating of the second transition layer Take 2 parts of hydroxypropyl starch (degree of substitution 0.6), 1.5 parts of β-cyclodextrin, 0.8 parts of hydrogenated lecithin, and nano-silica (gas phase method, specific surface area 200±25m²). 2 0.3 parts of ( / g) were used to prepare a second transition layer slurry with a solid content of 18% by adding an appropriate amount of purified water.

[0034] The particles obtained in step (4) are placed in a fluidized bed, the air inlet temperature is set to 50°C and the material temperature is set to 40°C. The second transition layer slurry is sprayed in the bottom spray mode to form the second transition layer, which increases the weight by 2.5% of the core weight.

[0035] (6) Coating with an appearance color-changing layer (blue layer) Take 3 parts of CI 74160 (blue pigment), add 1.5 parts of hydrogenated lecithin and 1 part of hydroxypropyl starch, and prepare an appearance color-changing slurry with a solid content of 20% with appropriate amount of purified water and dispersant.

[0036] The particles obtained in step (5) are placed in a fluidized bed, the air inlet temperature is set to 50°C and the material temperature is set to 40°C. The appearance color-changing layer slurry is sprayed in the bottom spray mode to form the appearance color-changing layer, which increases the weight to 4% of the core weight.

[0037] (7) Coating of aroma slow-release layer The preparation method of rose essential oil-β-cyclodextrin inclusion complex includes: taking 10 parts of β-cyclodextrin, adding 100 parts of purified water, heating to 50℃ and stirring to dissolve, then slowly adding 2 parts of rose essential oil, stirring at 50℃ for 4 hours; cooling to room temperature, standing for 12 hours to allow the inclusion complex to crystallize; filtering, vacuum drying at 40℃, pulverizing and passing through a 100-mesh sieve to obtain the final product.

[0038] Take 3 parts of rose essential oil-β-cyclodextrin inclusion complex and 0.5 parts of hydroxypropyl starch, and use ethanol-water (volume ratio 1:1) as the dispersion medium to prepare an aroma slow-release layer slurry with a solid content of 28%. Stir continuously at low speed to prevent sedimentation.

[0039] The granules obtained in step (6) were placed in a fluidized bed with an inlet air temperature of 35°C and a material temperature of 25°C. A slow-release aroma layer slurry was sprayed using a bottom-spray method to form the slow-release aroma layer, which increased in weight to 1.8% of the core weight. Then, fluidization was continued at room temperature (25°C) for 6 minutes to allow the outer layer to dry and set. The final granules were then dried at 35°C until the moisture content was ≤3%, passed through 80-mesh and 200-mesh sieves, and the finished granules between these two values ​​were collected.

[0040] Example 2 The only difference between this embodiment and embodiment 1 is that in step (6), the weight increase of the appearance color-changing layer is 2.5% of the core weight, and the amount of CI 74160 is 1.5 parts; in step (4), the weight increase of the concealer and brightening layer is 14% of the core weight.

[0041] Example 3 The only difference between this embodiment and embodiment 1 is that in step (6), the weight increase of the color-changing layer is 6% of the core weight, and the amount of CI 74160 used is 4.5 parts.

[0042] Comparative Example 1 The only difference between this comparative example and Example 1 is that steps (3) and (5) are omitted, that is, the first transition layer and the second transition layer are not set.

[0043] Comparative Example 2 The only difference between this comparative example and Example 1 is that step (7) is replaced by: Take 3 parts of rose essential oil and 0.5 parts of hydroxypropyl starch, and use ethanol-water (volume ratio 1:1) as the dispersion medium to prepare an aroma slow-release slurry with a solid content of 28%. Stir continuously at low speed to prevent sedimentation.

[0044] The granules obtained in step (4) were placed in a fluidized bed with an inlet air temperature of 35°C and a material temperature of 25°C. A slow-release aroma layer slurry was sprayed using a bottom-spray method to form the slow-release aroma layer, increasing its weight to 1.8% of the core weight. Then, fluidization was continued for 6 minutes at room temperature (25°C) to allow the outer layer to dry and set. The final granules were then dried at 35°C until the moisture content was ≤3%, passed through 80-mesh and 200-mesh sieves, and the finished granules between these two values ​​were collected.

[0045] Comparative Example 3 The only difference between this comparative example and Example 1 is that step (3) is replaced by: coating of the first transition layer: take 6 parts of hydroxypropyl starch, prepare a slurry with a solid content of 18% with purified water, and spray it to increase the weight by 3%; Step (3) is replaced with: Coating of the second transition layer: Take 4.3 parts of hydroxypropyl starch and nano-silica (gas phase method, specific surface area 200±25m²). 2 0.3 parts of ( / g) were used to prepare a slurry with a solid content of 18% using purified water, resulting in a 2.5% weight gain after spraying.

[0046] Comparative Example 4 The only difference between this comparative example and Example 1 is that steps (2) and (6) are swapped, that is, from the inside out, they are core layer - blue layer - first transition layer - white layer - second transition layer - brown layer - aroma slow release layer.

[0047] Performance testing The color-changing particles prepared in Examples 1-3 and Comparative Examples 1-4 were subjected to the following performance tests.

[0048] Test methods (1) Color change speed test Take 0.1g of the granules prepared in Example 1, add them to 0.2g of water, soak for 1 minute, and then evenly apply to standard artificial skin (Vitro-Skin®, 2cm × 2cm). Apply standard fingertip pressure (approximately 0.5N / cm). 2 The samples were rubbed repeatedly, and the color changes were recorded using a high-speed camera until the blue color completely disappeared and a uniform skin tone was revealed. The time it took to change color was recorded. Each group was tested 10 times, and the average value was taken.

[0049] (2) Evaluation of concealing effect Simulated blemishes (brown spots, 3mm in diameter, with a contrast ratio of ΔE=15 to skin tone) were pre-created on standard artificial skin. 0.1g of granules (0.1g of the prepared granules were added to 0.2g of water and soaked for 1 minute before use) were applied and rubbed with a standard fingertip until color change was complete. The ΔE value between the concealed area and the surrounding normal skin tone was measured using a colorimeter. Simultaneously, 10 trained evaluators provided visual scoring (1-10 points).

[0050] (3) Overall evaluation of skin feel Ten trained evaluators (5 men and 5 women, with different skin types) each took 0.1g of the granules (0.1g of the prepared granules were added to 0.2g of water, soaked for 1 minute, and then used) and applied it to the inside of the forearm (2cm×2cm). They scored it according to five dimensions: smoothness, refreshingness, adherence, fineness, and overall skin feel (1-10 points, with 10 points being the best).

[0051] (4) Damage rate after transportation simulation Take 50g of the prepared particles and place them in a rotating drum (30rpm). Add 10g of standard glass beads (3mm in diameter). After rolling for 30min, count the proportion of broken particles in the blue layer.

[0052] (5) Color migration rate test Take the prepared granules, seal them in a package, and place them in a constant temperature and humidity chamber (40℃, RH 75%) for accelerated storage for 30 days. Cut them open to observe whether the white layer is contaminated and measure the ΔE value of the white layer.

[0053] (6) Aroma sustained release curve 10g of the prepared particles were placed in a headspace vial, and samples were taken at 0, 1, 7, 14, 30 and 90 days. The relative contents of the characteristic aroma components of rose essential oil were determined by headspace-GC / MS, and the aroma retention rate was calculated.

[0054] (7) Comprehensive acceleration of storage stability Take the prepared granules, seal them in a package, and place them in an accelerated testing chamber (40℃, RH 75%). Take samples at 0, 1, 2, 3, and 6 months respectively. Evaluate five dimensions: appearance integrity, normal color change function, concealing effect retention, skin feel retention, and fragrance retention. Each item has a full score of 100 points, and calculate the comprehensive score.

[0055] Test Results Table 1. Color Change Speed ​​and Concealing Effect Example 1 6.2±0.8 1.2±0.3 9.2±0.5 8.98 Example 2 4.5±0.5 1.5±0.3 8.8±0.6 8.72 Example 3 8.5±1.2 1.0±0.2 9.5±0.4 8.44 Comparative Example 1 12.5±2.0 3.9±0.8 5.5±1.0 6.12 Comparative Example 2 5.5±0.8 1.3±0.3 9.0±0.5 8.85 Comparative Example 3 10.5±1.5 3.2±0.6 6.5±0.8 7.20 Comparative Example 4 Color change failed 5.5±0.9 2.1±1.0 4.70 As shown in Table 1, the color-changing time of Examples 1-3 is within the suitable range of 4-10 seconds, the concealing ΔE is <2.0, the visual score is >8.5, and the overall skin feel score is >8.4, indicating that the color-changing particles of the present invention have excellent color-changing speed, concealing effect and skin feel. Comparative Example 1, lacking a transition layer, exhibited a color-changing time as long as 12.5 seconds and poor concealing effect (ΔE=3.9), with a skin feel score of only 6.12. This demonstrates the crucial role of the transition layer in color-changing uniformity and skin feel. This may be because, without a transition layer, a weak interface forms between the skin tone base layer, concealing and brightening layer, and the apparent color-changing layer. During friction, the layers slide relative to each other like "playing cards" rather than breaking simultaneously. The blue layer fragments are "padded" by the white layer, preventing them from quickly mixing with the underlying layers, thus prolonging the blue residue time. It may also be due to pigment migration causing interlayer pre-contamination, disrupting the three-color optical synergy, requiring longer friction time to "blend evenly," or a combination of both. Furthermore, contamination of the white layer and distortion of the brown layer also significantly reduce the concealing effect. Comparative Example 2, with direct spraying of rose essential oil (without β-cyclodextrin inclusion), showed a color-changing time and concealing effect similar to Example 1, demonstrating good structural integrity. Comparative Example 3 used a single hydroxypropyl starch as the transition layer material, with a color-changing time of 10.5 seconds, a concealing effect ΔE of 3.2, and a visual score of only 6.5, proving that a single auxiliary material cannot achieve the comprehensive effect of this invention. Comparative Example 4 had the layer sequence reversed, completely failing to achieve the color-changing function and exhibiting a brownish-yellow appearance, proving that the specific layer sequence of "blue layer on the outermost layer and brown layer on the innermost layer" is a necessary technical feature for achieving the purpose of the invention.

[0056] Table 2 Structural stability and storage stability Example 1 3±1 1.2±0.3 70 95 Example 2 4±1 1.0±0.2 68 93 Example 3 2±1 1.3±0.3 66 96 Comparative Example 1 35±5 8.5±1.2 42 45 Comparative Example 2 5±2 1.5±0.3 8 85 Comparative Example 3 18±3 4.5±0.6 53 65 Comparative Example 4 12±4 2.0±1.0 55 42 Table 2 shows that the transport breakage rate of Examples 1-3 was <5%, the 30-day white layer ΔE was <2.0, the 90-day aroma retention rate was >66%, and the 6-month comprehensive score was >90, indicating that the color-changing particles of the present invention have excellent structural and storage stability. Comparative Example 1, without a transition layer, had a transport breakage rate as high as 35%, and the white layer ΔE was 8.5 (severe pigment migration, with brown and / or blue pigments severely contaminating the white layer), demonstrating the crucial role of the transition layer in structural stability and anti-migration. Comparative Example 2, with direct spraying of rose essential oil, although having a transport breakage rate close to that of Example 1 (5%), had a 90-day aroma retention rate of only 8%, significantly lower than the 70% of Example 1, demonstrating the significant effect of the rose essential oil-β-cyclodextrin inclusion complex on long-lasting aroma release. Comparative Example 3 used hydroxypropyl starch as the transition layer material, with a transport breakage rate of 18%, a white layer ΔE of 4.5, and a comprehensive score of only 65. This demonstrates that the three-component compound system of hydroxypropyl starch + β-cyclodextrin + hydrogenated lecithin produced a synergistic effect, which cannot be replaced by a single excipient. Comparative Example 4 had a reversed layer sequence, with a transport breakage rate of 12% (significantly higher than Example 1), and a comprehensive score of only 42. This demonstrates that the reversed layer sequence leads to uneven stress distribution in the structure, which has a significant impact on structural stability.

[0057] Based on the test results of the above embodiments and comparative examples, the following conclusions can be drawn: (1) The present invention achieves a time-series color-changing effect of “appearing blue in the product and turning into skin color after application” through a core-shell structure of “core layer - skin tone base layer - first transition layer - concealing and brightening layer - second transition layer - appearance color-changing layer - fragrance slow-release layer”. The color-changing time is controllable, the color-changing is uniform, the concealing effect is excellent, and the skin feel is good.

[0058] (2) The setting of the first transition layer and the second transition layer is the key to the realization of "controllable color change" in this invention: the effect is significantly worse when there is no transition layer, which proves the important role of the transition layer in structural stability and color change uniformity.

[0059] (3) The transition layer excipient compound system is the core of achieving excellent performance: using a single hydroxypropyl starch as the transition layer raw material (Comparative Example 3), the overall effect is also significantly worse than that of Example 1, proving that the three-component compound of hydroxypropyl starch + β-cyclodextrin + hydrogenated lecithin produced a synergistic effect, and the inclusion and anti-migration function of β-cyclodextrin and the wetting and dispersing function of hydrogenated lecithin are irreplaceable.

[0060] (4) Rose essential oil-β-cyclodextrin inclusion complex is the key to achieving long-lasting aroma release: Direct spraying of rose essential oil (Comparative Example 2) Although the color change performance and structural stability are similar to those of Example 1, the aroma retention rate after 90 days is significantly lower than that of Example 1, proving the significant effect of β-cyclodextrin inclusion complex technology on long-lasting aroma release.

[0061] (5) The specific layer sequence of “blue layer on the outermost layer and brown layer on the innermost layer” is a necessary technical feature to achieve the purpose of the invention: the reverse layer sequence (comparative example 4) cannot present a blue appearance at all, and the color-changing function fails, proving that the layer sequence has a decisive influence on the color-changing function.

[0062] Application Examples Application Example 1: Color-Changing BB Cream Take 5 parts of the color-changing particles prepared in Example 1, 15 parts of cyclopentamethoxysiloxane, 10 parts of glycerol, 5 parts of butanediol, 3 parts of cetyl PEG / PPG-10 / 1 polydimethoxysiloxane, 1 part of sodium chloride, 0.5 parts of preservative, 0.2 parts of fragrance, and deionized water to make up to 100 parts.

[0063] Preparation method: Disperse the color-changing particles in cyclopentamethoxysiloxane, add the remaining ingredients, homogenize and emulsify to obtain color-changing BB cream.

[0064] This BB cream is a uniform blue color that changes to a natural skin tone 5-8 seconds after application. It has excellent coverage and a smooth, refreshing feel.

[0065] Application Example 2: Color-Changing Concealer Take 8 parts of the color-changing particles prepared in Example 1, 20 parts of petrolatum, 10 parts of microcrystalline wax, 5 parts of beeswax, 10 parts of squalane, 5 parts of titanium dioxide, and 0.5 parts of preservative, heat and melt them together, pour them into a rod-shaped mold, cool and solidify them to obtain a color-changing concealer.

[0066] This concealer comes in a blue stick that changes color quickly after application. It provides strong coverage and long-lasting wear.

[0067] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application, and the scope of protection of this invention should be determined by the scope defined in the claims. For those skilled in the art, several improvements and modifications can be made without departing from the spirit and scope of this invention, and these improvements and modifications should also be considered within the scope of protection of this invention. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A multi-layered coated particle for cosmetics with color-correcting function, characterized in that, The particles have a core-shell structure and, from the inside out, include: a core layer, a skin tone base layer, a first transition layer, a concealing and brightening layer, a second transition layer, and an appearance color-changing layer. The first transition layer is disposed between the skin tone base layer and the concealer / brightening layer; The second transition layer is disposed between the concealer and brightening layer and the appearance color-changing layer; The color-changing layer is coated on the surface of the second transition layer; The raw materials for the first transition layer and the second transition layer each independently include hydroxypropyl starch, β-cyclodextrin, and hydrogenated lecithin.

2. The multi-layer coated particles for cosmetics with color-correcting function according to claim 1, characterized in that, The raw material for the core layer is a monosaccharide-polyol. Preferably, the monosaccharide-polyol is selected from mannitol, erythritol, xylitol, sorbitol and mixtures thereof, and more preferably mannitol. And / or, the core layer has a particle size of 60-150 mesh; And / or, the surface of the core layer is further covered with a bottom bonding reinforcement layer, the raw material of which includes hydroxypropyl methylcellulose, and the weight gain of the bottom bonding reinforcement layer is 0.8-1.2% of the weight of the core layer.

3. The multi-layer coated particles for cosmetics with color-correcting function according to claim 1, characterized in that, The skin tone base layer is coated on the surface of the core layer. The raw materials of the skin tone base layer include CI 77492, CI 77491 and CI77499, hydrogenated lecithin and corn starch. Optionally, the mass ratio of CI 77492, CI 77491, CI 77499, hydrogenated lecithin and corn starch is (20-30):(3-8):(0.3-1):(1-3):(2-4). And / or, the weight increase of the skin tone base layer is 8-12% of the weight of the core layer; And / or, the raw materials of the concealer and brightening layer include CI 77891, hydrogenated lecithin, and corn starch. Optionally, the mass ratio of CI77891, hydrogenated lecithin, and corn starch is (20-30):(2-3):(1.5-2.5). And / or, the weight increase of the concealer and brightening layer is 10-15% of the weight of the core layer.

4. The multi-layer coated particles for cosmetics with color-correcting function according to claim 1, characterized in that, In the first transition layer, the mass ratio of hydroxypropyl starch, β-cyclodextrin, and hydrogenated lecithin is (2-4):(1-3):(0.5-1.5). And / or, the weight increase of the first transition layer is 2-4% of the weight of the core layer; And / or, the raw material of the second transition layer further includes nano-silica, and the mass ratio of hydroxypropyl starch, β-cyclodextrin, hydrogenated lecithin and nano-silica in the second transition layer is (1-3):(1-2):(0.5-1):(0.2-0.5); And / or, the weight increase of the second transition layer is 2-3% of the weight of the core layer.

5. The multi-layer coated particles for cosmetics with color-correcting function according to claim 1, characterized in that, The color-changing layer comprises CI 74160, hydrogenated lecithin, and hydroxypropyl starch. Optionally, the mass ratio of CI 74160, hydrogenated lecithin, and hydroxypropyl starch is (2-4):(1-2):(0.5-1.5). And / or, the weight gain of the color-changing layer is 2.5-6% of the weight of the core layer; And / or, the multi-layer coated particles for cosmetics with color-correcting function further include a fragrance slow-release layer, which is coated on the surface of the appearance color-changing layer. Optionally, the raw material of the fragrance slow-release layer includes plant essential oil-β-cyclodextrin inclusion complex or slightly acidic oil core. Preferably, the raw material of the aroma sustained-release layer further includes hydroxypropyl starch, and the mass ratio of the plant essential oil-β-cyclodextrin inclusion complex to hydroxypropyl starch is (2-4):(0.3-0.8), and the weight gain of the aroma sustained-release layer is 1.5-2.5% of the weight of the core layer.

6. A method for preparing multi-layered coated particles for cosmetics with color-correcting function, characterized in that, Includes the following steps: (1) Preparation of the core layer; (2) In a fluidized bed, a skin tone base layer slurry is sprayed onto the surface of the core layer to form a skin tone base layer; (3) In a fluidized bed, the first transition layer slurry is sprayed onto the surface of the skin tone base layer to form the first transition layer; (4) In a fluidized bed, the concealer and brightening layer slurry is sprayed onto the surface of the first transition layer to form a concealer and brightening layer; (5) In a fluidized bed, the second transition layer slurry is sprayed onto the surface of the concealer and brightening layer to form the second transition layer; (6) In a fluidized bed, the appearance color-changing layer slurry is sprayed onto the surface of the second transition layer to form an appearance color-changing layer; (7) In a fluidized bed, the aroma slow-release layer slurry is sprayed onto the surface of the appearance color-changing layer to form an aroma slow-release layer. After drying and sieving, the finished product is obtained. The raw materials for the first transition layer and the second transition layer each independently include hydroxypropyl starch, β-cyclodextrin, and hydrogenated lecithin.

7. The preparation method according to claim 6, characterized in that, In step (1), the preparation method of the core layer is as follows: mannitol is prepared into an aqueous solution of 30-40wt%, and spherical mannitol core layer is prepared by spray drying. The portion with a particle size range of 60-150 mesh is collected by sieving. And / or, step (1) further includes: placing the obtained core layer in a fluidized bed and pre-coating it with a 0.5-1.0 wt% aqueous solution of hydroxypropyl methylcellulose to increase its weight by 0.8-1.2% to form a bottom bonding reinforcement layer.

8. The preparation method according to claim 6, characterized in that, In step (2), CI 77492, CI 77491, CI 77499, hydrogenated lecithin, and corn starch are taken and purified water is used as the dispersion medium to prepare a skin-tone base layer slurry. The solid content of the skin-tone base layer slurry is 25-35%, the air inlet temperature during spraying is 50-70℃, and the material temperature is 40-50℃. The mass ratio of CI 77492, CI 77491, CI 77499, hydrogenated lecithin, and corn starch is (20-30):(3-8):(0.3-1):(1-3):(2-4). The weight gain of the skin-tone base layer is 8-12% of the weight of the core layer. In step (3), hydroxypropyl starch, β-cyclodextrin, and hydrogenated lecithin are taken and purified water is used as the dispersion medium to prepare a first transition layer slurry. The solid content of the first transition layer slurry is 15-20%, the air inlet temperature during spraying is 45-60℃, and the material temperature is 35-45℃. In the first transition layer, the mass ratio of hydroxypropyl starch, β-cyclodextrin, and hydrogenated lecithin is (2-4):(1-3):(0.5-1.5), and the weight gain of the first transition layer is 2-4% of the weight of the core layer. In step (4), CI 77891, hydrogenated lecithin, and corn starch are taken and purified water is used as the dispersion medium to prepare a concealing and brightening layer slurry. The solid content of the concealing and brightening layer slurry is 25-35%, the air inlet temperature during spraying is 50-70℃, and the material temperature is 40-50℃. The raw materials of the concealing and brightening layer include CI 77891, hydrogenated lecithin, and corn starch, and the mass ratio of CI 77891, hydrogenated lecithin, and corn starch is (20-30):(2-3):(1.5-2.5). The weight gain of the concealing and brightening layer is 10-15% of the weight of the core layer. In step (5), hydroxypropyl starch, β-cyclodextrin, hydrogenated lecithin, and nano-silica are taken and purified water is used as the dispersion medium to prepare a second transition layer slurry. The solid content of the second transition layer slurry is 15-20%, the air inlet temperature during spraying is 45-60℃, and the material temperature is 35-45℃. The mass ratio of the hydroxypropyl starch, β-cyclodextrin, hydrogenated lecithin, and nano-silica is (1-3):(1-2):(0.5-1):(0.2-0.5), and the weight gain of the second transition layer is 2-3% of the weight of the core layer. In step (6), CI 74160, hydrogenated lecithin, and hydroxypropyl starch are taken and purified water is used as the dispersion medium to prepare an appearance color-changing layer slurry. The solid content of the appearance color-changing layer slurry is 18-25%, the air inlet temperature during spraying is 45-55℃, and the material temperature is 35-45℃. The mass ratio of CI 74160, hydrogenated lecithin, and hydroxypropyl starch is (2-4):(1-2):(0.5-1.5), and the weight gain of the appearance color-changing layer is 2.5-6% of the weight of the core layer.

9. The preparation method according to claim 6, characterized in that, In step (7), plant essential oil-β-cyclodextrin inclusion complex and hydroxypropyl starch are taken and prepared into aroma sustained-release layer slurry using ethanol-water as dispersion medium; in a fluidized bed, the aroma sustained-release layer slurry is sprayed onto the surface of the appearance color-changing layer to form an aroma sustained-release layer. The inlet air temperature during spraying is 30-40℃ and the material temperature is 20-30℃; wherein, the mass ratio of plant essential oil-β-cyclodextrin inclusion complex to hydroxypropyl starch is (2-4):(0.3-0.8), and the weight gain of the aroma sustained-release layer is 1.5-2.5% of the weight of the core layer; The preparation method of the plant essential oil-β-cyclodextrin inclusion complex includes: taking 10 parts of β-cyclodextrin, adding 100 parts of water, heating to 50°C and stirring to dissolve, then adding 2 parts of plant essential oil dropwise, stirring at 50°C for 4 hours, cooling to room temperature, standing for 12 hours to allow the inclusion complex to crystallize, filtering, and vacuum drying to obtain the plant essential oil-β-cyclodextrin inclusion complex; After the aroma-releasing layer slurry is sprayed, it is further fluidized at room temperature (20-25℃) for 5-10 minutes for low-temperature setting; the drying temperature is 35-40℃, and it is dried until the moisture content is ≤3%.

10. The use of the multi-layer coated particles for cosmetics with color-correcting function as described in any one of claims 1-5 in the preparation of cosmetics.

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