Powder multistage variable pressure circulating gas flow process, product prepared and applications thereof

Abstract

This invention provides a multi-stage variable pressure circulating airflow process for powder production, along with the products prepared and their applications, relating to the field of cosmetic technology. The core of this multi-stage variable pressure circulating airflow process lies in: initially stirring cosmetic raw materials at high speed to obtain an initial mixture; then subjecting them to multi-stage variable pressure circulating airflow pulverization to obtain processed cosmetic raw materials; specifically, the multi-stage variable pressure circulating airflow pulverization involves: first, high-pressure crushing at 0.8-1 MPa; then, medium-pressure homogenization at 0.6 MPa ≤ pressure < 0.8 MPa; and finally, low-pressure classification at 0.4 MPa ≤ pressure < 0.6 MPa. Powder-based makeup products produced by this process exhibit excellent particle size uniformity, resulting in a smooth, delicate, and long-lasting finish without caking, effectively concealing fine lines and pores, and significantly improving the naturalness and comfort of the makeup. This process has been applied to the preparation of powder-based makeup products such as pressed powder, blush, facial highlighter, and contouring products.

Description

Technical Field

[0001] This invention belongs to the field of cosmetic technology, specifically relating to a multi-stage variable pressure circulating airflow process for powders, the products prepared from it, and their applications. Background Technology

[0002] Powder-based makeup products need to have a fine powder texture to ensure a smooth, delicate, long-lasting, non-caking, and flawless finish, giving a natural, "naturally good skin" look. For example, contour powder, highlighter, setting powder, and pressed setting powder, if the powder texture is poor, will not adhere well to the skin, leading to powder fallout, caking, makeup fading, and an unsightly makeup look.

[0003] Currently, the main ingredients in powder-based makeup products on the market include talc, silica, mica, and boron nitride, which, as fillers, generally have a particle size between 10-100 μm. Due to the uneven particle size and relatively large particle size, makeup doesn't adhere well to the skin. To improve the skin-adhesive effect, some powder-based makeup products also add acrylic copolymers. While improving the product composition can improve the makeup effect to some extent, it doesn't fundamentally improve the makeup effect by addressing the physical properties of the ingredients, such as particle size distribution and mixing uniformity.

[0004] To improve the particle size distribution and size of powders, Chinese invention patent CN120284749A discloses a method for preparing a setting and brightening powder compact. First, synthetic fluorophlogopite, silica, polymethylsilsesquioxane, boron nitride, bismuth oxychloride, zinc stearate, aluminum octenyl succinate, mica, alumina, hydrolyzed sodium hyaluronate, and pigment are mixed evenly in a homogenizer. Then, polydimethylsiloxane, octyldodecyl stearyl oxystearate, isoamyl laurate, diisostearyl malate, phenoxyethanol, and octyl glycol are mixed evenly, heated to 45±5℃, and poured into the spray tank of the homogenizer. While spraying oil, the mixture is stirred and mixed evenly, then pulverized and further air-jet pulverized. The powder is then sieved and pressed into a mold to obtain a powder compact. Although this invention incorporates an air-jet pulverization process, resulting in smaller and more uniformly dispersed powder particles compared to conventional mechanical mixing, single-pass air-jet pulverization is insufficient for controlling the particle size uniformity of complex multi-component systems. Differences in density, hardness, particle size, and structure of powder components can easily lead to grading or agglomeration between powders, resulting in uneven microstructure of the product.

[0005] Chinese invention patent CN118415893A discloses a cosmetic mica that can replace talc and provides a smooth, adherent finish, along with its preparation method. This patent describes a method for preparing a smooth, cosmetic mica, including the steps of: using cosmetic mica as raw material, grinding it under high-pressure airflow in an air compressor and then under variable-frequency airflow to peel off the layered mica and form independent mica particles. The resulting mica particles are ultra-fine, with most particles ranging from 5-8 μm in size, resulting in a delicate and skin-adhering feel. However, in this technical solution, the purpose of multiple variable-frequency airflow grinding is to peel off the layered mica particles to form independent mica particles, ensuring the layered mica particles are completely separated, rather than addressing the issues of uneven particle size and poor makeup application. Furthermore, this technical solution does not describe the effect of grinding pressure on particle size and cosmetic makeup effect.

[0006] During the air jet milling process, the grinding pressure, number of passes, sequence, and temperature all affect the particle size and distribution of the powder. For example, Chinese invention patent CN113940905A describes a BB cream and its preparation method. The four o'clock seed powder in this BB cream is pulverized using an air jet mill. The particle size of the four o'clock seed particles in the initial screening and the grinding temperature all affect the final particle size distribution and specific surface area of ​​the four o'clock seed powder.

[0007] Existing research does not document the effects of airflow pulverization circulation methods, pressure settings, and pulverization methods on the particle size distribution, particle size, and makeup effect of powder-based cosmetic mixtures. Furthermore, while particle size and distribution influence makeup effect, smaller particle size does not necessarily equate to a better makeup finish. Therefore, to further clarify the direct relationship between the preparation process of powder-based cosmetics and the particle size distribution and makeup effect, this invention develops a multi-stage variable pressure circulating airflow process for powder pulverization. Through in-depth research on process parameters, this invention produces powder-based cosmetic products with high uniformity of particle size distribution, suitable particle size, and significantly improved makeup finish. Summary of the Invention

[0008] This invention addresses the problems existing in the prior art by providing a multi-stage variable pressure circulating airflow process for powders, as well as the products and applications prepared using this process. The multi-stage variable pressure circulating airflow process employs specific pressures and circulation methods, setting gradients of different airflow pressures to allow the powder raw materials to undergo multiple circulating airflow treatments within a closed-loop system. This ensures that the powder particles maintain their original structure while keeping the particle size and distribution within a certain range, thereby improving the makeup effect and the feel on the skin.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0010] First, this invention provides a multi-stage variable pressure circulating airflow process for powders, comprising the steps of: mixing cosmetic raw materials, initially stirring at high speed to obtain an initial mixture; and subjecting the initial mixture to multi-stage variable pressure circulating airflow pulverization to obtain processed cosmetic raw materials.

[0011] The multi-stage variable pressure circulating airflow pulverization specifically involves: first, high-pressure crushing at 0.8-1 MPa; then, medium-pressure homogenization at 0.6 MPa ≤ pressure < 0.8 MPa; and finally, low-pressure grading at 0.4 MPa ≤ pressure < 0.6 MPa.

[0012] Preferably, the initial high-speed stirring specifically involves stirring at a speed of 2800-3200 rpm for 1.5-3 minutes.

[0013] More preferably, the initial high-speed stirring specifically involves stirring at a speed of 2980 rpm for 2 minutes.

[0014] Preferably, the multi-stage variable pressure circulating airflow pulverization specifically involves: first, high-pressure crushing at 0.8-1 MPa for 2-3 times; then, medium-pressure homogenization at 0.6 MPa ≤ pressure < 0.8 MPa for 1-2 times; and finally, low-pressure grading at 0.4 MPa ≤ pressure < 0.6 MPa for 1-2 times.

[0015] More preferably, the multi-stage variable pressure circulating airflow pulverization specifically involves: first, two high-pressure crushing processes at 0.8-1 MPa; then, two medium-pressure homogenization processes at 0.6 MPa ≤ pressure < 0.8 MPa; and finally, one low-pressure classification process at 0.4 MPa ≤ pressure < 0.6 MPa.

[0016] In this invention, the range of 0.8 MPa-1 MPa refers to any point value or any two point values ​​within the range of [0.8, 1.0]. Exemplarily, it is not limited to 0.8-1 MPa, 0.8-0.81 MPa, 0.8-0.82 MPa, 0.8-0.83 MPa, 0.8-0.84 MPa, 0.8-0.85 MPa, 0.8-0.86 MPa, 0.8-0.87 MPa, 0.8-0.88 MPa, 0.8-0.89 MPa, 0.8-0.9 MPa, 0.8-0.91 MPa, 0.8-0.92 MPa, 0.8-0.93 MPa, 0.8-0.94 MPa, 0.8-0.95 MPa, 0.8-0.96 MPa, or 0.8-0.97 MPa. MPa, 0.8-0.98MPa, 0.8-0.99MPa, 0.8-1.0MPa, 0.85-0.9MPa, 0.85-0.95MPa, 0. 85-1.0MPa, 0.9-0.95MPa, 0.9-1.0MPa, 0.8MPa, 0.81MPa, 0.82MPa, 0.83MPa, 0. 84MPa, 0.85MPa, 0.86MPa, 0.87MPa, 0.88MPa, 0.89MPa, 0.90MPa, 0.91MPa, 0.92 MPa, 0.93MPa, 0.94MPa, 0.95MPa, 0.96MPa, 0.97MPa, 0.98MPa, 0.99MPa, 1.0MPa.

[0017] In this invention, the pressure of 0.6 MPa ≤ pressure < 0.8 MPa refers to any point value or any two points within the range of [0.6, 0.8) MPa. Exemplarily, it is not limited to 0.6-0.7 MPa, 0.6-0.71 MPa, 0.6-0.72 MPa, 0.6-0.73 MPa, 0.6-0.74 MPa, 0.6-0.75 MPa, 0.6-0.76 MPa, 0.6-0.77 MPa, 0.6-0.78 MPa, 0.6-0.79 MPa, 0.6-0.795 MPa, or 0.6-0.799 MPa. Pa, 0.6MPa, 0.61MPa, 0.62MPa, 0.63MPa, 0.64MPa, 0.65MPa, 0.66MPa, 0.67MPa, 0.68MPa, 0.69MPa, 0.70MPa, 0.71MPa, 0.72M Pa, 0.73MPa, 0.74MPa, 0.75MPa, 0.76MPa, 0.77MPa, 0.78MPa, 0.79MPa, 0.792MPa, 0.794MPa, 0.796MPa, 0.798MPa, 0.799MPa.

[0018] In this invention, the pressure of 0.4 MPa ≤ pressure < 0.6 MPa refers to any point value or any two points within the range of [0.4, 0.6) MPa. Exemplarily, it is not limited to 0.4-0.5 MPa, 0.4-0.51 MPa, 0.4-0.52 MPa, 0.4-0.53 MPa, 0.4-0.54 MPa, 0.4-0.55 MPa, 0.4-0.56 MPa, 0.4-0.57 MPa, 0.4-0.58 MPa, 0.4-0.59 MPa, 0.4-0.595 MPa, or 0.4-0.599 MPa. Pa, 0.4MPa, 0.41MPa, 0.42MPa, 0.43MPa, 0.44MPa, 0.45MPa, 0.46MPa, 0.47MPa, 0.48MPa, 0.49MPa, 0.50MPa, 0.51MPa, 0.52M Pa, 0.53MPa, 0.54MPa, 0.55MPa, 0.56MPa, 0.57MPa, 0.58MPa, 0.59MPa, 0.592MPa, 0.594MPa, 0.596MPa, 0.598MPa, 0.599MPa.

[0019] More preferably, the multi-stage variable pressure circulating airflow pulverization specifically involves: first, two high-pressure crushing processes at 1.0 MPa; then, two medium-pressure homogenization processes at 0.7 MPa; and finally, one low-pressure classification process at 0.5 MPa.

[0020] In this invention, the multi-stage variable pressure circulating airflow pulverization process involves a pulverization time of 1-1.5 kg / min for each cycle. Specifically, for every 1-1.5 kg of cosmetic raw materials, a 1-min high-pressure pulverization is performed first, followed by 1-2 1-min cycles of high-pressure pulverization; then, a 1-min medium-pressure homogenization is performed, followed by 0-1 1-min cycles of medium-pressure homogenization; finally, 1-2 1-min low-pressure classifications are performed.

[0021] In this invention, the cosmetic raw materials are conventional ingredients in powder-based makeup products in the art, and are not limited to talc, mica, silica, boron nitride, and polyethylene; they also include ingredients such as binders and preservatives.

[0022] Preferably, it also includes the ingredient: colorant.

[0023] Preferably, the binder is a common oil component in powder-based cosmetic products, and is not limited to polydimethylsiloxane, trimethylsiloxysilicate, cetyl ethylhexanoate, or octyl dodecyl stearyl stearate.

[0024] Preferably, the preservative is a common preservative ingredient in powder-based cosmetic products, and is not limited to caprylyl glycol (and) ethylhexylglycerin.

[0025] More preferably, the pigment is a conventional pigment component in powder-based cosmetic products, and is not limited to CI 77891 (Titanium Dioxide) (and) triethoxyoctylsilane, CI 77492 (iron oxide yellow), CI 73360 (red 30 lake) attached to aluminum hydroxide, CI 77491 (iron oxide red), and CI 77499 (black iron oxide).

[0026] In some specific embodiments of the present invention, the cosmetic raw materials, by weight, include the following components: 25-30 parts talc, 35-45 parts mica, 5-15 parts silica, 4-10 parts boron nitride, 2-8 parts polyethylene, 5-10 parts binder, and 0.5-0.8 parts preservative.

[0027] In some specific embodiments of the present invention, the cosmetic raw materials, by weight, include the following components: 29 parts talc, 42 parts mica, 10 parts silica, 5.5 parts boron nitride, 5 parts polyethylene, 7 parts binder, and 0.6 parts preservative.

[0028] In some specific embodiments of the present invention, the cosmetic raw materials, by weight, include the following components: 28 parts talc, 42 parts mica, 10 parts silica, 4.4 parts boron nitride, 5 parts polyethylene, 7 parts binder, and 0.6 parts preservative.

[0029] In some specific embodiments of the present invention, the cosmetic raw materials also include color powder components; by weight, the components include: 25-30 parts talc, 35-45 parts mica, 4-15 parts silica, 5-10 parts boron nitride, 2-8 parts polyethylene, 5-10 parts binder, 0.8-7.4 parts color powder and 0.5-0.8 parts preservative.

[0030] In some specific embodiments of the present invention, the cosmetic raw materials, by weight, include the following components: 29 parts talc, 42 parts mica, 10 parts silica, 5.5 parts boron nitride, 5 parts polyethylene, 7 parts binder, 0.9 parts colorant, and 0.6 parts preservative.

[0031] In some specific embodiments of the present invention, the cosmetic raw materials, by weight, include the following components: 28 parts talc, 42 parts mica, 10 parts silica, 4.4 parts boron nitride, 5 parts polyethylene, 7 parts binder, 7.4 parts colorant, and 0.6 parts preservative.

[0032] In some specific embodiments of the present invention, the mica in the cosmetic raw materials includes: mica, synthetic fluorophlogopite treated with triethoxyoctylsilane, and mica treated with triethoxyoctylsilane.

[0033] In one specific embodiment of the present invention, the cosmetic raw materials, by weight, include the following components: 29 parts talc, 24 parts synthetic fluorophlogopite treated with triethoxyoctylsilane, 8 parts mica treated with triethoxyoctylsilane, 10 parts mica, 10 parts silica, 5.5 parts boron nitride, 5 parts polyethylene, 2 parts polydimethylsiloxane, 1 part trimethylsiloxysilicate, 2 parts cetyl ethylhexanoate, 2 parts octyldodecyl stearyl stearate, 0.4 parts CI 77891 (and) triethoxyoctylsilane, 0.46 parts CI 77492, 0.04 parts CI 73360 (aluminum hydroxide (and) CI 73360) attached to aluminum hydroxide, and 0.6 parts preservative; the preservative is a mixture of caprylyl glycol and ethylhexylglycerin (caprylyl glycol (and) ethylhexylglycerin), with a mass ratio of caprylyl glycol to ethylhexylglycerin of 7:3.

[0034] In one specific embodiment of the present invention, the cosmetic raw materials, by weight, include the following components: 28 parts talc, 24 parts synthetic fluorophlogopite treated with triethoxyoctylsilane, 8 parts mica treated with triethoxyoctylsilane, 10 parts mica, 10 parts silica, 4.4 parts boron nitride, 5 parts polyethylene, 2 parts polydimethylsiloxane, 1 part trimethylsiloxysilicate, 2 parts cetyl ethylhexanoate, 2 parts octyldodecyl stearyl stearate, 0.4 parts CI 77891 (and) triethoxyoctylsilane, 2.6 parts CI 77492, 1.8 parts CI 77491, 2.6 parts CI 77499, and 0.6 parts preservative; the preservative is a mixture of caprylyl glycol and ethylhexylglycerin (caprylyl glycol (and) ethylhexylglycerin), with a mass ratio of caprylyl glycol to ethylhexylglycerin of 7:3.

[0035] Then, the present invention provides a powder-based cosmetic product, which is prepared by the above-mentioned multi-stage variable pressure circulating airflow process for powder.

[0036] Preferably, the powder-based cosmetic product is a pressed powder or a contour powder; the cosmetic raw materials obtained by the multi-stage variable pressure circulating airflow process are pressed into blocks to obtain the pressed powder or contour powder.

[0037] Finally, this invention provides the application of the above-mentioned multi-stage variable pressure circulating airflow process for powders in the preparation of powder cosmetics.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] 1. The multi-stage variable pressure circulating airflow process for powder in this invention involves setting gradients of different airflow pressures, allowing the powder raw materials to undergo multiple circulating airflow treatments within a closed-loop system. High-pressure crushing, medium-pressure homogenization, and low-pressure classification are sequentially employed, achieving a precise balance between particle carrying capacity and particle size and weight within a specific pressure range. This multi-stage variable pressure circulating airflow process ensures that powder particles maintain their original structure while keeping their particle size and distribution within a certain range, thereby improving makeup effect and skin feel.

[0040] 2. The multi-stage variable pressure circulating airflow process of the present invention, compared with the traditional single airflow treatment, or compared with airflow processes with different circulation methods, can make all component particles undergo repeated crushing and sorting through forced circulation with specific parameters, which significantly improves the overall particle size uniformity of the component system, while ensuring that the particle size and distribution of the components are concentrated within a specific range, and at the same time ensures an excellent experience in makeup effect and skin feel.

[0041] 3. The multi-stage variable pressure circulating airflow process of the powder in this invention concentrates the particle size range of the powder in the range of 1-10μm, further concentrated in the range of 2-10μm, and even further concentrated in the range of 2-5μm; according to the process and formula of this invention, a softer skin feel and a more delicate makeup effect can be achieved, and the makeup is clear, silky and not patchy; the phenomenon of powder floating and powder caking is reduced, and the fineness, naturalness and lasting power of the makeup are significantly improved. Attached Figure Description

[0042] Figure 1 This is a particle size distribution diagram of cosmetic raw materials after processing in Example 1 of the present invention.

[0043] Figure 2 This is a picture showing the forehead wrinkles of the test subjects after using pressed powder.

[0044] Figure 3 This is a picture showing the crow's feet wrinkles of the test subjects after using the powder compact.

[0045] Figure 4 This is a diagram showing the circumference of the test subjects after they used the powder compact.

[0046] Figure 5 This is a diagram showing the pores on the tip of the nose of the test subjects after using the powder compact.

[0047] Figure 6 This is a graph showing the spreadability of the contour powder after the subject used it.

[0048] Figure 7 This is a test image showing the makeup lasting effect after the subjects used contour powder. Detailed Implementation

[0049] The following non-limiting embodiments are intended to enable those skilled in the art to gain a more comprehensive understanding of the present invention, but do not limit the invention in any way. The following content is merely an exemplary description of the scope of protection claimed by the present invention, and those skilled in the art can make various changes and modifications to the present invention based on the disclosed content, and such changes should also fall within the scope of protection claimed by the present invention.

[0050] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise stated in the invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0051] The present invention will be further described below by way of specific embodiments. Unless otherwise specified, all chemical reagents used in the embodiments of the present invention are obtained through conventional commercial means.

[0052] In a specific embodiment of the present invention, the basic information and weight parts of the cosmetic raw materials used are shown in Table 1. Products from different manufacturers do not have a significant impact on the efficacy.

[0053] Table 1

[0054]

[0055] When the prepared cosmetic is a pressed powder, the pigment composition (C phase) is shown in Table 2:

[0056] Table 2

[0057]

[0058] When the prepared cosmetic is a contour powder, the pigment composition (C phase) is shown in Table 3:

[0059] Table 3

[0060]

[0061] Within the range of cosmetic raw materials and proportions described in Tables 1, 2, and 3, the technical effects described in this invention can be achieved.

[0062] Basic Example 1

[0063] Specifically, in a specific embodiment of the present invention, for example, the ingredients of the powder cosmetic raw material by weight are as follows: 29 parts talc, 24 parts synthetic fluorophlogopite treated with triethoxyoctylsilane, 8 parts mica treated with triethoxyoctylsilane, 10 parts mica, 10 parts silica, 5.5 parts boron nitride, 5 parts polyethylene, 2 parts polydimethylsiloxane, 1 part trimethylsiloxysilicate, 2 parts cetyl ethylhexanoate, 2 parts octyldodecyl stearyl stearate, 0.4 parts CI77891 (and) triethoxyoctylsilane, 0.46 parts CI 77492, 0.04 parts aluminum hydroxide (and) CI73360, and 0.6 parts octyl glycol (and) ethylhexylglycerin.

[0064] Basic Implementation Example 2

[0065] Specifically, in a specific embodiment of the present invention, exemplarily, the cosmetic raw materials for the contour powder, by weight, include the following components: 28 parts talc, 24 parts synthetic fluorophlogopite treated with triethoxyoctylsilane, 8 parts mica treated with triethoxyoctylsilane, 10 parts mica, 10 parts silica, 4.4 parts boron nitride, 5 parts polyethylene, 2 parts polydimethylsiloxane, 1 part trimethylsiloxysilicate, 2 parts cetyl ethylhexanoate, 2 parts octyldodecyl stearyl stearate, 0.4 parts CI 77891 (and) triethoxyoctylsilane, 2.6 parts CI 77492, 1.8 parts CI 77491, 2.6 parts CI 77499, and 0.6 parts preservative; the preservative is a mixture of caprylyl glycol and ethylhexylglycerin (caprylyl glycol (and) ethylhexylglycerin), with a mass ratio of caprylyl glycol to ethylhexylglycerin of 7:3.

[0066] The raw materials of Basic Example 1 and Basic Example 2 were processed using the powder multi-stage variable pressure circulating airflow process described in the following examples and comparative examples.

[0067] Example 1

[0068] A multi-stage variable pressure circulating airflow process for powder, comprising the following steps:

[0069] (1) Mix the cosmetic raw materials (basic example) according to the formula dosage, and stir at high speed for 2 minutes at 2980 rpm to obtain the initial mixture;

[0070] (2) The initial mixture is subjected to multi-stage variable pressure circulating airflow pulverization: first, it is subjected to two high-pressure crushing at 1.0 MPa, then two medium-pressure homogenizations at 0.7 MPa, and finally one low-pressure classification at 0.5 MPa; that is, a total of 5 airflow treatments are performed, and the time for each treatment is 1 kg / min based on the weight of the cosmetic raw material; the treated cosmetic raw material is obtained.

[0071] Example 2

[0072] A multi-stage variable pressure circulating airflow process for powder, comprising the following steps:

[0073] (1) Mix the cosmetic raw materials (basic example) according to the formula dosage, and stir at high speed for 2 minutes at 2980 rpm to obtain the initial mixture;

[0074] (2) The initial mixture is subjected to multi-stage variable pressure circulating airflow pulverization: first, it is subjected to two high-pressure crushing at 0.8MPa, then to two medium-pressure homogenizations at 0.79MPa, and finally to one low-pressure classification at 0.59MPa; that is, a total of 5 airflow treatments are performed, and the time for each treatment is 1kg / min based on the weight of the cosmetic raw material; the treated cosmetic raw material is obtained.

[0075] Example 3

[0076] A multi-stage variable pressure circulating airflow process for powder, comprising the following steps:

[0077] (1) Mix the cosmetic raw materials (basic example) according to the formula dosage, and stir at high speed for 2 minutes at 2980 rpm to obtain the initial mixture;

[0078] (2) The initial mixture is subjected to multi-stage variable pressure circulating airflow pulverization: first, it is subjected to two high-pressure crushings at 0.9 MPa, then two medium-pressure homogenizations at 0.6 MPa, and finally one low-pressure classification at 0.4 MPa; that is, a total of 5 airflow treatments are performed, and the time for each treatment is 1 kg / min based on the weight of the cosmetic raw material; the treated cosmetic raw material is obtained.

[0079] Example 4

[0080] A multi-stage variable pressure circulating airflow process for powder, comprising the following steps:

[0081] (1) Mix the cosmetic raw materials (basic example) according to the formula dosage, and initially stir at high speed at 2800 rpm for 3 minutes to obtain the initial mixture;

[0082] (2) The initial mixture is subjected to multi-stage variable pressure circulating airflow pulverization: first, it is subjected to high pressure pulverization at 1.0 MPa three times, then medium pressure homogenization at 0.7 MPa once, and finally low pressure classification at 0.5 MPa once; that is, a total of 5 airflow treatments are performed, and the time for each treatment is 1 kg / min based on the weight of the cosmetic raw material; the treated cosmetic raw material is obtained.

[0083] Example 5

[0084] A multi-stage variable pressure circulating airflow process for powder, comprising the following steps:

[0085] (1) Mix the cosmetic raw materials (basic example) according to the formula dosage, and initially stir at high speed at 3200 rpm for 1 min to obtain the initial mixture;

[0086] (2) The initial mixture is subjected to multi-stage variable pressure circulating airflow pulverization: first, it is subjected to two high-pressure crushing at 1.0 MPa, then to two medium-pressure homogenizations at 0.7 MPa, and finally to two low-pressure classifications at 0.5 MPa; that is, a total of 6 airflow treatments are performed, and the time for each treatment is 1 kg / min based on the weight of the cosmetic raw material; the treated cosmetic raw material is obtained.

[0087] Comparative Example 1

[0088] Unlike Example 1, the multi-stage variable pressure circulating airflow pulverization step (2) was not performed.

[0089] The cosmetic raw materials (basic example) were mixed according to the formula dosage and initially stirred at high speed at 2980 rpm for 2 minutes to obtain the processed cosmetic raw materials.

[0090] Comparative Example 2

[0091] Unlike Example 1, only one airflow pulverization is performed, specifically:

[0092] (1) Mix the cosmetic raw materials (basic example) according to the formula dosage, and stir at high speed for 2 minutes at 2980 rpm to obtain the initial mixture;

[0093] (2) The initial mixture is subjected to air jet milling once: high pressure crushing at 1.0 MPa; the high pressure crushing time is 1 kg / min based on the weight of the cosmetic raw material; and the processed cosmetic raw material is obtained.

[0094] Comparative Example 3

[0095] Unlike Example 1, the number and method of multi-stage variable pressure circulating airflow pulverization are different. In this example, high-pressure pulverization occurs twice, medium-pressure homogenization occurs three times, and low-pressure grading is not performed. Specifically:

[0096] (1) Mix the cosmetic raw materials (basic example) according to the formula dosage, and stir at high speed for 2 minutes at 2980 rpm to obtain the initial mixture;

[0097] (2) The initial mixture is subjected to multi-stage variable pressure circulating airflow pulverization: first, it is subjected to high pressure pulverization twice at 1.0 MPa, and then it is subjected to medium pressure homogenization three times at 0.7 MPa; that is, a total of 5 airflow treatments are performed, and the time for each treatment is 1 kg / min based on the weight of the cosmetic raw material; the treated cosmetic raw material is obtained.

[0098] Comparative Example 4

[0099] Unlike Example 1, the pressure of the multi-stage variable pressure circulating airflow pulverizer is different, specifically:

[0100] (1) Mix the cosmetic raw materials (basic example) according to the formula dosage, and stir at high speed for 2 minutes at 2980 rpm to obtain the initial mixture;

[0101] (2) The initial mixture is subjected to multi-stage variable pressure circulating airflow pulverization: first, it is subjected to two high-pressure crushing at 1.2MPa, then two medium-pressure homogenizations at 0.7MPa, and finally one low-pressure classification at 0.3MPa; that is, a total of 5 airflow treatments are performed, and the time for each treatment is 1kg / min based on the weight of the cosmetic raw material; the treated cosmetic raw material is obtained.

[0102] Comparative Example 5

[0103] Unlike Example 1, the pressure of the multi-stage variable pressure circulating airflow pulverizer is different, specifically:

[0104] (1) Mix the cosmetic raw materials (basic example) according to the formula dosage, and stir at high speed for 2 minutes at 2980 rpm to obtain the initial mixture;

[0105] (2) The initial mixture is subjected to multi-stage variable pressure circulating airflow pulverization: first, it is subjected to two high-pressure crushing at 1.0 MPa, then to two medium-pressure homogenizations at 0.8 MPa, and finally to one low-pressure classification at 0.7 MPa; that is, a total of 5 airflow treatments are performed, and the time for each treatment is 1 kg / min based on the weight of the cosmetic raw material; the treated cosmetic raw material is obtained.

[0106] Comparative Example 6

[0107] Unlike Example 1, the circulation sequence of the multi-stage variable pressure circulating airflow pulverizer is different, specifically:

[0108] (1) Mix the cosmetic raw materials (basic example) according to the formula dosage, and stir at high speed for 2 minutes at 2980 rpm to obtain the initial mixture;

[0109] (2) The initial mixture is subjected to multi-stage variable pressure circulating air jet pulverization: first, a low-pressure classification of 0.5MPa is performed once, then a medium-pressure homogenization of 0.7MPa is performed twice, and finally a high-pressure crushing of 1.0MPa is performed twice; that is, a total of 5 air jet treatments are performed, and the time for each treatment is 1kg / min based on the weight of the cosmetic raw material; the treated cosmetic raw material is obtained.

[0110] Experiment 1 Particle size test

[0111] Detection method: The powder cosmetic raw material of the basic example 1 was processed using the processes of Examples 1-5 and Comparative Examples 1-6 respectively to obtain the processed cosmetic raw material; particle size was detected using a Bettersize2000 laser particle size analyzer. The results of D50, D90, Span (particle size distribution width), and SSA (specific surface area) are shown in Table 4.

[0112] Table 4

[0113]

[0114] As shown in Table 4, the particle size distribution of all example groups was concentrated. Compared with Comparative Example 1, the D50 of Example 1 group decreased by 67.8%, and the D90 decreased by 68.4%. The particle size distribution of all example groups was uniform. The core range of 1-10 μm accounted for the highest proportion in Example 1 group, significantly reducing the proportion of ultra-large particle size powder that easily causes powder caking. The powder dispersion of all example groups was sufficient. The specific surface area of ​​the cosmetic raw materials after treatment in the example groups was 924.6 m² / kg-1032.7 m² / kg, indicating that particle agglomeration was effectively broken up and surface energy was fully released.

[0115] from Figure 1 As can be seen from the process described in this embodiment, the powder particle size of the cosmetic raw materials processed by the process of this invention is mainly concentrated in 1-10μm, further concentrated in 2-10μm, and even further concentrated in 2-5μm, with the highest proportion in this particle size range.

[0116] Experiment 2: Makeup Effect Test

[0117] The powder cosmetic raw material of the basic example 1 was processed using the processes of Examples 1-5 and Comparative Examples 1-6 respectively. The processed cosmetic raw material was pressed into powder blocks to obtain powder. The powder was applied to the nose, eyes and forehead using a makeup brush in the same manner. The facial condition was scanned using VISIA and the makeup effect was analyzed by the software.

[0118] Subjects: 10 participants (numbered A, B, C, D, E, F, G, H, I, J), aged 20-35, female. Before the test, all participants underwent skin type assessment using a professional skin analyzer and a standardized questionnaire. The final test group consisted of 2 participants with dry skin, 3 with oily skin, 4 with combination skin, and 1 with normal skin. Each participant tested and analyzed the makeup effect of each powder compact, with each powder compact used at least 12 hours apart.

[0119] 1. The proportion of forehead wrinkles and the density of wrinkles

[0120] Area percentage (%) = (Number of pixels in the forehead wrinkle area / Total number of pixels in the forehead analysis area) × 100%.

[0121] Wrinkle density (%) = (total length of wrinkle contour / area of ​​forehead analysis region) × 100%.

[0122] The percentage of forehead wrinkle area and wrinkle density are shown in Table 5. After using the powder foundations prepared in Examples 1-5 and Comparative Examples 1-6, the forehead wrinkles of Subject A (dry skin) are shown in Table 5. Figure 2 .

[0123] Table 5

[0124]

[0125] From Table 5 and Figure 2 As can be seen, the cosmetics obtained by using the multi-stage variable pressure circulating airflow process of the present invention to process cosmetic raw materials can significantly hide wrinkles and have good concealing and makeup effects.

[0126] 2. Crow's feet wrinkle detection

[0127] The percentage of crow's feet area is calculated as follows: (pixel area of ​​crow's feet region / total pixel area of ​​the corner of the eye analysis region) × 100%.

[0128] Crow's feet wrinkle density (%) = (total length of crow's feet contour / area of ​​the analysis area at the corner of the eye) × 100%.

[0129] Crow's feet wrinkle detection method: Standardized multispectral imaging is performed using the VISIA skin detection system. The crow's feet wrinkle features in the corner of the eyes are automatically identified and quantified through gray-level co-occurrence matrix texture analysis and Canny edge detection algorithm.

[0130] The average depth detection method for crow's feet wrinkles: Based on the 3D topological imaging module of the VISIA system, a three-dimensional model of the skin surface is reconstructed through the principle of stereo vision. Using the wrinkle-free area as the reference plane, the depth of wrinkle depressions is accurately calculated and the average value is obtained.

[0131] The results for crow's feet area percentage, wrinkle density, wrinkle length (pixels), average depth (pixels), and maximum depth (pixels) are shown in Table 6. After using the powder compacts prepared in Examples 1-5 and Comparative Examples 1-6, the crow's feet condition of Subject A is shown in Table 6. Figure 3 .

[0132] Table 6

[0133]

[0134] From Table 6 and Figure 3As can be seen, cosmetics prepared by using the multi-stage variable pressure circulating airflow process of the present invention to process cosmetic raw materials can significantly conceal wrinkles. Compared with the comparative example, the cosmetics prepared by the multi-stage variable pressure circulating airflow process of the present invention have better concealing and makeup effects, significantly shortened wrinkle length, and shallower wrinkle depth.

[0135] 3. Perimeter texture detection

[0136] Periorbital wrinkle area percentage (%) = (pixel area of ​​periorbital wrinkle region / total pixel area of ​​the analysis region around the eye socket) × 100%.

[0137] Periorbital wrinkle density (%) = (Total length of periorbital wrinkle outline / Area of ​​the analysis area around the eye socket) × 100%.

[0138] The percentage of periorbital wrinkles and wrinkle density are shown in Table 7. After using the powder compacts prepared in Examples 1-5 and Comparative Examples 1-6, the periorbital wrinkle condition of Subject A is shown in Table 7. Figure 4 .

[0139] Table 7

[0140]

[0141] From Table 7 and Figure 4 As can be seen, cosmetics prepared by using the multi-stage variable pressure circulating airflow process of the present invention to process cosmetic raw materials can significantly conceal wrinkles; compared with the comparative example, the cosmetics prepared by the multi-stage variable pressure circulating airflow process of the present invention have better concealing and makeup application effects.

[0142] 4. Nose tip pore detection

[0143] Pore ​​area percentage (%) = (total area of ​​individual pore openings / total skin area of ​​the analysis area) × 100%;

[0144] Pore ​​density (%) = (number of pores / area of ​​analysis area) × 100%.

[0145] Pore ​​area detection method: Utilizing the professional pore analysis module of the VISIA skin detection system, cross-polarized light imaging technology is used to eliminate surface reflection interference. An improved Canny edge detection algorithm and ellipse fitting method are applied to accurately identify and quantify pore opening characteristics. The analysis area is 1cm on both sides of the nose. 2 The standard cheek area was calibrated using standard microspheres to ensure the accuracy and repeatability of the measurement results.

[0146] The results of pore area ratio and pore density are shown in Table 8. After using the powder compacts prepared in Examples 1-5 and Comparative Examples 1-6, the pore condition on the tip of Subject A's nose is shown in Table 8. Figure 5 .

[0147] Table 8

[0148]

[0149] From Table 8 and Figure 5 As can be seen, cosmetics prepared by using the multi-stage variable pressure circulating airflow process of the present invention to process cosmetic raw materials can significantly conceal pores; compared with the comparative example, the cosmetics prepared by the multi-stage variable pressure circulating airflow process of the present invention have better concealing and makeup effects, and significantly reduced pore density and pore area.

[0150] In summary, the comparison of makeup effects in the four regions shows that the powder prepared by the example group through a multi-stage variable pressure circulating airflow process with specific parameters to process cosmetic raw materials is significantly better than the comparative group in terms of covering fine lines and pores, avoiding caking and powdering, and producing a natural and delicate makeup finish.

[0151] Experiment 3: Cosmetic Spreadability Test

[0152] The cosmetic raw materials for the contour powder of Basic Example 2 were processed using the processes of Examples 1-5 and Comparative Examples 1-6, respectively. The processed cosmetic raw materials were pressed into powder blocks to obtain contour powder. The same amount (0.05g) was applied to the inner forearm of the subject under "Experiment 2" and blended with a makeup brush using the same technique.

[0153] The comparison of the spreadability of the powder on the arm after Subject A used the contour powders of Examples 1-5 and Comparative Examples 1-6 is shown in the figure. Figure 6 ,from Figure 6 As can be seen from the example, the cosmetic raw materials treated in the example have a natural diffusion, uniform color, and are not prone to clumping or accumulating; while the cosmetic raw materials treated in the comparative example have obvious color clumping and accumulation, and uneven diffusion.

[0154] Experiment 4: Makeup-holding effect test

[0155] The cosmetic raw materials for the contour powder of Basic Example 2 were processed using the processes of Examples 1-5 and Comparative Examples 1-6, respectively. The processed cosmetic raw materials were pressed into powder blocks to obtain contour powder. The same amount (0.05g) was applied to the inner forearm of the subject under "Experiment 2" and blended with a makeup brush using the same technique. The makeup lasted for 8 hours after application.

[0156] The comparison images of the makeup retention effect of the powder on the arm after Subject A used the contour powders of Examples 1-5 and Comparative Examples 1-6 are shown below. Figure 7 ,from Figure 7As can be seen from the example, the cosmetic raw materials treated in the example still maintain a good makeup-holding effect after 8 hours of wear, and the makeup effect is natural and even; the cosmetic raw materials treated in the comparative example show more serious makeup removal after 8 hours of wear, and the makeup is patchy and the color is uneven and clumpy.

[0157] Experiment 5 Friction Coefficient Test

[0158] The cosmetic powder raw material of Basic Example 1 was processed using the processes of Examples 1-5 and Comparative Examples 1-6 respectively. The processed cosmetic raw material was pressed into powder blocks to obtain powder samples. 0.05g of each sample was placed on the inner side of the forearm and spread evenly under standard pressure. The coefficient of dynamic friction of each sample on the inner side of the forearm was measured using a Cutometer® MPA580 skin friction coefficient meter under the conditions of 0.5N probe pressure and 1mm / s sliding speed.

[0159] The coefficient of kinetic friction (μk) = frictional force (F) / normal force (N).

[0160] The results of the dynamic friction coefficients of each group of powder blocks are shown in Table 9.

[0161] Table 9

[0162]

[0163] As can be seen from Table 9, the cosmetic raw materials processed using the multi-stage variable pressure circulating airflow process of the present invention have a lower dynamic friction coefficient, are easier to apply, and have a better effect on concealing skin blemishes. Compared with the comparative example, the multi-stage variable pressure circulating airflow process of the present invention further controls the dynamic friction coefficient of the powder while controlling the powder particle size, thereby affecting the final makeup effect and the effect of concealing pores and fine lines.

[0164] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A multi-stage variable pressure circulating airflow process for powder, characterized in that, The process includes: mixing cosmetic raw materials, initially stirring at high speed to obtain an initial mixture; subjecting the initial mixture to multi-stage variable pressure circulating airflow pulverization to obtain processed cosmetic raw materials; The multi-stage variable pressure circulating airflow pulverization specifically involves: first, high-pressure crushing at 0.8-1 MPa; then, medium-pressure homogenization at 0.6 MPa ≤ pressure < 0.8 MPa; and finally, low-pressure grading at 0.4 MPa ≤ pressure < 0.6 MPa.

2. The multi-stage variable pressure circulating airflow process for powder according to claim 1, characterized in that, The initial high-speed stirring specifically involves stirring at a speed of 2800-3200 rpm for 1.5-3 minutes.

3. The powder multi-stage variable pressure circulating airflow process according to claim 2, characterized in that, The initial high-speed stirring specifically involves stirring at 2980 rpm for 2 minutes.

4. The multi-stage variable pressure circulating airflow process for powder according to claim 1, characterized in that, The multi-stage variable pressure circulating airflow pulverization specifically involves: first, high-pressure pulverization at 0.8-1 MPa for 2-3 times; then, medium-pressure homogenization at 0.6 MPa ≤ pressure < 0.8 MPa for 1-2 times; and finally, low-pressure grading at 0.4 MPa ≤ pressure < 0.6 MPa for 1-2 times.

5. The multi-stage variable pressure circulating airflow process for powder according to claim 4, characterized in that, The multi-stage variable pressure circulating airflow pulverization specifically involves: first, two high-pressure crushing processes at 0.8-1 MPa; then, two medium-pressure homogenization processes at 0.6 MPa ≤ pressure < 0.8 MPa; and finally, one low-pressure classification process at 0.4 MPa ≤ pressure < 0.6 MPa.

6. The multi-stage variable pressure circulating airflow process for powder according to claim 5, characterized in that, The multi-stage variable pressure circulating airflow pulverization specifically involves: first, two high-pressure crushing processes at 1.0 MPa; then, two medium-pressure homogenization processes at 0.7 MPa; and finally, one low-pressure classification process at 0.5 MPa.

7. The multi-stage variable pressure circulating airflow process for powder according to claim 1, characterized in that, In the multi-stage variable pressure circulating airflow pulverizer, the pulverization time for each circulating airflow is 1-1.5 kg / min.

8. The multi-stage variable pressure circulating airflow process for powder according to claim 1, characterized in that, The cosmetic raw materials include the following components: talc, mica, silica, boron nitride, polyethylene, binder, colorant, and preservative. Specifically, the cosmetic raw materials include the following components by weight: 25-30 parts talc, 35-45 parts mica, 5-15 parts silica, 4-10 parts boron nitride, 2-8 parts polyethylene, 5-10 parts binder, 0.8-7.4 parts colorant, and 0.5-0.8 parts preservative.

9. A powder-based makeup product, characterized in that, It is prepared by the multi-stage variable pressure circulating airflow process for powder as described in any one of claims 1-8.

10. The application of the multi-stage variable pressure circulating airflow process for powders according to any one of claims 1-8 in the preparation of powder cosmetics.

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