Cosmetic highlight pearlescent magnetic powder and preparation method and application thereof

Abstract

The invention provides cosmetic highlight pearlescent magnetic powder as well as a preparation method and application thereof. The magnetic powder is prepared from magnetic metal oxide, mica powder, titanium dioxide, a siloxane surface treating agent, pearlescent pigment, an adhesive, an antioxidant and an active agent. The magnetic metal oxide comprises ferroferric oxide, ferric oxide, zinc oxide and the like, and the particle size of the mica powder is 10-50 microns. The siloxane surface treating agent comprises polydimethylsiloxane and the like, and the adhesive is polyvinyl alcohol and the like. The antioxidant comprises butylated hydroxyanisole and the like, and the active agent is a mixture of cocamidopropyl betaine and lecithin. The preparation method comprises the steps of surface modification of the magnetic metal oxide, preparation of pearlescent pigment suspension, doping treatment, mixing and ball milling. The high-gloss pearlescent magnetic powder with uniform particle size is prepared through ultrasonic stirring and magnetic field treatment, has good dispersity and adsorbability, and can effectively adsorb skin grease and improve the oil control effect of cosmetics.

Description

Technical Field

[0001] The invention relates to the technical field of cosmetics, and in particular to a cosmetic high-gloss pearlescent magnetic powder and a preparation method and application thereof. Background Art

[0002] In the cosmetics industry, highlighter products are important tools for enhancing skin gloss and creating a three-dimensional makeup look. The continuous innovation of their formulas and technologies has always been the focus of market attention. Traditional highlighter products mainly rely on physical particles such as mica and titanium dioxide to achieve the gloss effect of the skin, but these materials have certain limitations in terms of gloss, durability and personalized customization. In recent years, with the development of nanotechnology and magnetic materials, magnetic elements have been introduced into the field of cosmetics, opening up new ways to improve the performance and expand the functions of highlighter products. Modern consumers have increasingly diversified requirements for highlighter products. They not only pursue natural and soft gloss effects, but also hope that the products have good skin feel, lasting makeup effects and personalized color performance.

[0003] However, during the daily storage and use of cosmetics, changes in the magnetic field or other electromagnetic interference in the external environment may affect the magnetic stability of the magnetic powder. For example, after passing through some areas with strong magnetic fields during transportation, or after long-term contact with other magnetic objects, the magnetism of the magnetic powder may change, resulting in deviations from the expected magnetic effect when used, affecting the accuracy and effect of makeup. Over time, the magnetism of the magnetic powder may gradually decay. This is because the physical properties of the magnetic material itself determine that its magnetism will gradually weaken under certain conditions, and cosmetics will experience different environmental conditions during production, storage, and sales. In particular, temperature changes and humidity changes may accelerate the decay of magnetism, making the product less magnetic after a period of use than at the beginning. Secondly, poor oil control is another common problem. Although many magnetic powder cosmetics claim to have oil control effects, they may not actually be able to effectively slow down sebum secretion, or cannot maintain the oil control effect for a long time, resulting in reduced consumer satisfaction with the product and poor performance.

[0004] Therefore, there is a lot of room for improvement in the magnetic stability and oil control effects of existing cosmetic high-gloss pearlescent products. A new technical solution is urgently needed to solve these problems in order to meet consumers' demand for high-quality cosmetics, which has become an important research direction in the cosmetics industry. Summary of the invention

[0005] In view of this, the present invention proposes a cosmetic high-gloss pearlescent magnetic powder and a preparation method and application thereof to solve the above problems.

[0006] The technical solution of the present invention is achieved as follows: a cosmetic high-gloss pearlescent magnetic powder: comprising the following raw materials in parts by weight: 10-30 parts of magnetic metal oxide, 30-50 parts of mica powder, 10-20 parts of titanium dioxide, 1-5 parts of silicone surface treatment agent, 5-15 parts of pearlescent pigment, 3-10 parts of adhesive, 0.1-1 part of antioxidant, 0.5-1 part of active agent; the magnetic metal oxide includes but is not limited to ferrosoferric oxide, ferric oxide, and zinc oxide; the particle size of the mica powder is 10-50 μm; the silicone surface treatment agent includes but is not limited to polydimethylsiloxane, polymethylhydrogensiloxane or epoxy-modified siloxane; the adhesive is any one of polyvinyl alcohol, polyurethane, cellulose or vinyl acetate.

[0007] Furthermore, a cosmetic high-gloss pearlescent magnetic powder comprises the following raw materials in parts by weight: 20 parts of magnetic metal oxide, 40 parts of mica powder, 15 parts of titanium dioxide, 3 parts of silicone surface treatment agent, 10 parts of pearlescent pigment, 7 parts of adhesive, 0.5 parts of antioxidant, and 0.8 parts of active agent.

[0008] Furthermore, the silicone surface treatment agent includes but is not limited to polydimethylsiloxane, polymethylhydrogensiloxane or epoxy-modified silicone.

[0009] Furthermore, the pearlescent pigment is a natural fish scale pearlescent pigment, which is prepared by taking scales of hairtail, sardine or herring, cleaning them, adding the scales to an ethanol solution with a mass concentration of 50-90%, oscillating and dissolving them at 40-60°C and an oscillation frequency of 400-800rpm for 3-5h, wherein the mass volume ratio of the scales to the solvent is 35-55:100 g / mL, taking them out, filtering, washing the precipitate, and then drying them at 50-100°C for 6-10h, taking them out and grinding them to a particle size of 10-30μm.

[0010] Furthermore, the antioxidant is butylated hydroxyanisole or diphenylamine.

[0011] Furthermore, the active agent is cocamidopropyl betaine and lecithin in a volume ratio of 5-8:1-3.

[0012] Furthermore, a method for preparing a cosmetic high-gloss pearlescent magnetic powder comprises the following steps:

[0013] S1. Modification of magnetic metal oxides: The magnetic metal oxides are cleaned and dried for pretreatment, ground to a particle size of 1-10 nm, placed in a vacuum chamber, and evacuated to 1×10 4Pa or above, introduce a siloxane surface treatment agent to heat it to 200-300°C, apply a pulsed magnetic field to oscillate and cure for 10-30 minutes, the pulsed magnetic field frequency is 10-15Hz, the pulsed magnetic field voltage is 100-250V, and the magnetic induction intensity is 0.1-2.0T to obtain magnetic nanoparticles; use a silane coupling agent to modify the surface of the magnetic material to improve its compatibility with other cosmetic ingredients and enhance its ability to resist external interference.

[0014] S2. Preparing a pearlescent pigment suspension: dispersing the pearlescent pigment in water, with a mass volume ratio of the pearlescent pigment to water of 5-10:50 g / mL, to prepare a suspension;

[0015] S3, doping treatment: adding the magnetic nanoparticles prepared in S1 to the pearlescent pigment suspension, subjecting to ultrasonic stirring treatment for 20-40 minutes, filtering, washing and drying to obtain pearlescent magnetic powder;

[0016] S4, mixing: the pearlescent magnetic powder, mica powder, titanium dioxide and the active agent are mixed evenly, and stirred at a speed of 500-800 rpm for 25-35 minutes to obtain a mixed powder;

[0017] S5. Ball milling: Add the binder and antioxidant to the mixed powder and mill until uniform high-gloss pearlescent magnetic powder with a particle size of 10-30 μm is formed. The ball milling speed is 300-500 rpm and the stirring time is 40-80 min.

[0018] Furthermore, the S3 ultrasonic frequency is 20-100 kHz, the ultrasonic power is 50-200 W, the ultrasonic temperature is 40-60° C., and the stirring rate is 500-800 rpm.

[0019] Furthermore, the cosmetic high-gloss pearlescent magnetic powder is used in cosmetics.

[0020] Furthermore, the cosmetics are foundation, blush, eye shadow or lipstick.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) Improved magnetic stability: By subjecting magnetic metal oxides to specific modification treatments, they can maintain good magnetic stability under different environmental conditions (such as temperature and humidity changes). This ensures that the product can always exert its magnetic properties during use, bringing consumers a unique user experience. For example, in a high humidity environment, the product's magnetism will not be weakened by moisture, and there will be no significant fluctuations in magnetism at different temperatures.

[0023] (2) Significant oil control effect: Natural fish scale pearlescent pigment has a certain physical adsorption effect, which can absorb oil on the skin surface and reduce oiliness. Its porous structure and large specific surface area provide more adsorption sites for oil, effectively controlling the oil secretion of the skin, making the makeup more lasting and refreshing. Magnetic metal oxides can also assist in oil control by absorbing oil and regulating the skin microenvironment to reduce oil secretion. Synergistically with other ingredients, it further enhances the oil control performance of the product.

[0024] (3) Unique gloss effect: The doping process allows the magnetic nanoparticles to interact with the pearlescent pigments, producing a synergistic effect. Pearlescent pigments have a certain ability to reflect and scatter light, making the skin look brighter and smoother. The adsorption properties of magnetic nanoparticles can reduce the reflection of light by oil, further enhancing the effect of pearlescent pigments.

[0025] (4) Diversified application potential: The high-gloss pearlescent magnetic powder of the present invention can be widely used in the field of cosmetics, such as foundation, eye shadow, lipstick, nail polish, etc., providing consumers with a variety of beauty choices. DETAILED DESCRIPTION

[0026] In order to better understand the technical content of the present invention, specific embodiments are provided below to further illustrate the present invention.

[0027] Unless otherwise specified, the experimental methods used in the embodiments of the present invention are all conventional methods.

[0028] Unless otherwise specified, the materials, reagents, etc. used in the embodiments of the present invention can be obtained from commercial sources.

[0029] Example 1

[0030] A cosmetic high-gloss pearlescent magnetic powder comprises the following raw materials in parts by weight: 10 parts of magnetic metal oxide, 30 parts of mica powder, 10 parts of titanium dioxide, 1 part of silicone surface treatment agent, 5 parts of pearlescent pigment, 3 parts of adhesive, 0.1 part of antioxidant, and 0.5 part of active agent; the magnetic metal oxide is ferrosoferric oxide; the particle size of the mica powder is 10 μm; the silicone surface treatment agent is polydimethylsiloxane; and the adhesive is polyvinyl alcohol.

[0031] The silicone surface treatment agent is polydimethylsiloxane;

[0032] The pearlescent pigment is a natural fish scale pearlescent pigment, which is prepared by washing the scales of hairtail fish, adding the scales to a 50% ethanol solution, oscillating and dissolving the scales at 40° C. and an oscillation frequency of 400 rpm for 3 hours, wherein the mass volume ratio of the scales to the solvent is 35:100 g / mL, taking the scales out, filtering, washing the precipitate, drying the scales at 50° C. for 6 hours, and grinding the scales out to a particle size of 10 μm;

[0033] The antioxidant is butylated hydroxyanisole;

[0034] The active agent is cocamidopropyl betaine and lecithin in a volume ratio of 5:1.

[0035] Example 2

[0036] A cosmetic high-gloss pearlescent magnetic powder comprises the following raw materials in parts by weight: 30 parts of magnetic metal oxide, 50 parts of mica powder, 20 parts of titanium dioxide, 5 parts of silicone surface treatment agent, 15 parts of pearlescent pigment, 10 parts of adhesive, 1 part of antioxidant, and 1 part of active agent; the magnetic metal oxide is ferric oxide; the particle size of the mica powder is 50 μm; the silicone surface treatment agent is polymethyl hydrogen siloxane; and the adhesive is polyurethane.

[0037] The silicone surface treatment agent is polymethyl hydrogen siloxane;

[0038] The pearlescent pigment is a natural fish scale pearlescent pigment, which is prepared by washing sardine scales, adding the scales to a 90% ethanol solution, oscillating and dissolving the scales at 60° C. and an oscillation frequency of 800 rpm for 5 hours, wherein the mass volume ratio of the scales to the solvent is 55:100 g / mL, taking the scales out, filtering, washing the precipitate, and drying the precipitate at 100° C. for 10 hours, and then taking the precipitate out and grinding it to a particle size of 30 μm;

[0039] The antioxidant is diphenylamine;

[0040] The active agent is cocamidopropyl betaine and lecithin in a volume ratio of 8:3.

[0041] Example 3

[0042] A cosmetic high-gloss pearlescent magnetic powder comprises the following raw materials in parts by weight: 20 parts of magnetic metal oxide, 40 parts of mica powder, 15 parts of titanium dioxide, 3 parts of siloxane surface treatment agent, 10 parts of pearlescent pigment, 7 parts of adhesive, 0.5 parts of antioxidant, and 0.8 parts of active agent; the magnetic metal oxide is zinc oxide; the particle size of the mica powder is 30 μm; the siloxane surface treatment agent is epoxy-modified siloxane; and the adhesive is vinyl acetate.

[0043] The silicone surface treatment agent is epoxy-modified silicone;

[0044] The pearlescent pigment is a natural fish scale pearlescent pigment, which is prepared by washing the scales of herring, adding the scales to a 70% ethanol solution, oscillating and dissolving the scales at 50° C. and an oscillation frequency of 600 rpm for 4 hours, wherein the mass volume ratio of the scales to the solvent is 45:100 g / mL, taking the scales out, filtering, washing the precipitate, and drying the precipitate at 80° C. for 8 hours, and then taking the precipitate out and grinding it to a particle size of 20 μm;

[0045] The antioxidant is butylated hydroxyanisole;

[0046] The active agent is cocamidopropyl betaine and lecithin in a volume ratio of 7:2;

[0047] The above examples 1-3 adopt the following preparation method:

[0048] S1. Modification of magnetic metal oxides: The magnetic metal oxides were cleaned and dried for pretreatment, ground to a particle size of 5 nm, placed in a vacuum chamber, and evacuated to 1×10 4 Pa, a siloxane surface treatment agent was introduced to heat it to 250°C, and a pulsed magnetic field was applied to oscillate and cure for 20 minutes. The pulsed magnetic field frequency was 13 Hz, the pulsed magnetic field voltage was 200 V, and the magnetic induction intensity was 1.2 T to obtain magnetic nanoparticles;

[0049] S2. preparing a pearlescent pigment suspension: the pearlescent pigment is dispersed in water, and the mass volume ratio of the pearlescent pigment to water is 8:50 g / mL to prepare a suspension;

[0050] S3, doping treatment: adding the magnetic nanoparticles prepared in S1 to the pearlescent pigment suspension for ultrasonic stirring for 30 min, with an ultrasonic frequency of 60 kHz, an ultrasonic power of 120 W, an ultrasonic temperature of 50°C, and a stirring rate of 700 rpm, filtering, washing, and drying to obtain pearlescent magnetic powder;

[0051] S4, mixing: the pearlescent magnetic powder, mica powder, titanium dioxide and the active agent are mixed evenly, and stirred at a speed of 700 rpm for 30 minutes to obtain a mixed powder;

[0052] S5. Ball milling: Add the binder and antioxidant to the mixed powder and mill until a uniform high-gloss pearlescent magnetic powder with a particle size of 20 μm is formed. The ball milling speed is 400 rpm and the stirring time is 60 min.

[0053] Example 4

[0054] A cosmetic high-gloss pearlescent magnetic powder comprises the following raw materials in parts by weight: 20 parts of magnetic metal oxide, 40 parts of mica powder, 15 parts of titanium dioxide, 3 parts of siloxane surface treatment agent, 10 parts of pearlescent pigment, 7 parts of adhesive, 0.5 parts of antioxidant, and 0.8 parts of active agent; the magnetic metal oxide is zinc oxide; the particle size of the mica powder is 30 μm; the siloxane surface treatment agent is epoxy-modified siloxane; and the adhesive is vinyl acetate.

[0055] The silicone surface treatment agent is epoxy-modified silicone;

[0056] The pearlescent pigment is a natural fish scale pearlescent pigment, which is prepared by washing the scales of herring, adding the scales to a 70% ethanol solution, oscillating and dissolving the scales at 50° C. and an oscillation frequency of 600 rpm for 4 hours, wherein the mass volume ratio of the scales to the solvent is 45:100 g / mL, taking the scales out, filtering, washing the precipitate, and drying the precipitate at 80° C. for 8 hours, and then taking the precipitate out and grinding it to a particle size of 20 μm;

[0057] The antioxidant is butylated hydroxyanisole;

[0058] The active agent is cocamidopropyl betaine and lecithin in a volume ratio of 7:2;

[0059] The above-mentioned Example 4 adopts the following preparation method:

[0060] S1. Modification of magnetic metal oxides: The magnetic metal oxides were cleaned and dried for pretreatment, ground to a particle size of 1 nm, placed in a vacuum chamber, and evacuated to 1×10 4 Pa, a siloxane surface treatment agent was introduced to heat it to 200°C, and a pulsed magnetic field was applied to oscillate and cure for 10 min, the pulsed magnetic field frequency was 10 Hz, the pulsed magnetic field voltage was 100 V, and the magnetic induction intensity was 0.1 T, to obtain magnetic nanoparticles;

[0061] S2. preparing a pearlescent pigment suspension: the pearlescent pigment is dispersed in water, and the mass volume ratio of the pearlescent pigment to water is 5:50 g / mL to prepare a suspension;

[0062] S3, doping treatment: adding the magnetic nanoparticles prepared in S1 to the pearlescent pigment suspension for ultrasonic stirring treatment for 20 minutes, with an ultrasonic frequency of 20kHz, an ultrasonic power of 50W, an ultrasonic temperature of 40°C, and a stirring rate of 500rpm, filtering, washing, and drying to obtain pearlescent magnetic powder;

[0063] S4, mixing: the pearlescent magnetic powder, mica powder, titanium dioxide and the active agent are mixed evenly, and stirred at a speed of 500 rpm for 25 minutes to obtain a mixed powder;

[0064] S5. Ball milling: Add the binder and antioxidant to the mixed powder and mill until a uniform high-gloss pearlescent magnetic powder with a particle size of 10 μm is formed. The ball milling speed is 300 rpm and the stirring time is 40 min.

[0065] Example 5

[0066] A cosmetic high-gloss pearlescent magnetic powder comprises the following raw materials in parts by weight: 20 parts of magnetic metal oxide, 40 parts of mica powder, 15 parts of titanium dioxide, 3 parts of siloxane surface treatment agent, 10 parts of pearlescent pigment, 7 parts of adhesive, 0.5 parts of antioxidant, and 0.8 parts of active agent; the magnetic metal oxide is zinc oxide; the particle size of the mica powder is 30 μm; the siloxane surface treatment agent is epoxy-modified siloxane; and the adhesive is vinyl acetate.

[0067] The silicone surface treatment agent is epoxy-modified silicone;

[0068] The pearlescent pigment is a natural fish scale pearlescent pigment, which is prepared by washing the scales of herring, adding the scales to a 70% ethanol solution, oscillating and dissolving the scales at 50° C. and an oscillation frequency of 600 rpm for 4 hours, wherein the mass volume ratio of the scales to the solvent is 45:100 g / mL, taking the scales out, filtering, washing the precipitate, and drying the precipitate at 80° C. for 8 hours, and then taking the precipitate out and grinding it to a particle size of 20 μm;

[0069] The antioxidant is butylated hydroxyanisole;

[0070] The active agent is cocamidopropyl betaine and lecithin in a volume ratio of 7:2;

[0071] The above-mentioned Example 5 adopts the following preparation method:

[0072] S1. Modification of magnetic metal oxides: The magnetic metal oxides were cleaned and dried for pretreatment, ground to a particle size of 10 nm, placed in a vacuum chamber, and evacuated to 1×10 4 Pa, a siloxane surface treatment agent was introduced to heat it to 300°C, and a pulsed magnetic field was applied to oscillate and cure for 30 minutes, the pulsed magnetic field frequency was 15 Hz, the pulsed magnetic field voltage was 250 V, and the magnetic induction intensity was 2.0 T, to obtain magnetic nanoparticles;

[0073] S2. Preparing a pearlescent pigment suspension: dispersing the pearlescent pigment in water, with a mass volume ratio of the pearlescent pigment to water (g / mL) of 10:50, to prepare a suspension;

[0074] S3, doping treatment: adding the magnetic nanoparticles prepared in S1 to the pearlescent pigment suspension for ultrasonic stirring treatment for 40 minutes, with an ultrasonic frequency of 100 kHz, an ultrasonic power of 200 W, an ultrasonic temperature of 60°C, and a stirring rate of 800 rpm, filtering, washing, and drying to obtain pearlescent magnetic powder;

[0075] S4, mixing: the pearlescent magnetic powder, mica powder, titanium dioxide and the active agent are mixed evenly, and stirred at a speed of 800 rpm for 35 minutes to obtain a mixed powder;

[0076] S5. Ball milling: Add the binder and antioxidant to the mixed powder and perform ball milling until uniform high-gloss pearlescent magnetic powder with a particle size of 30 μm is formed. The ball milling speed is 500 rpm and the stirring time is 80 min.

[0077] Comparative Example 1

[0078] A cosmetic high-gloss pearlescent magnetic powder comprises the following raw materials in parts by weight: 40 parts of magnetic metal oxide, 20 parts of mica powder, 8 parts of titanium dioxide, 9 parts of silicone surface treatment agent, 3 parts of pearlescent pigment, 12 parts of adhesive, 3 parts of antioxidant and 0.3 parts of active agent.

[0079] Comparative Example 2

[0080] The difference between this comparative example and Example 3 is that the pearlescent pigment is replaced by an equal amount of ceramic flakes, which are ground to a particle size of 20 μm.

[0081] Comparative Example 3

[0082] The difference between this comparative example and Example 3 is that the magnetic metal oxide is not modified in the preparation method of the high-gloss pearlescent magnetic powder.

[0083] Comparative Example 4

[0084] The difference between this comparative example and Example 3 is that the high-gloss pearlescent magnetic powder is not doped in the preparation method.

[0085] Test Example 1-Safety Experiment

[0086] The high-gloss pearlescent magnetic powders of Examples 1-5 and Comparative Examples 1-4 were tested for skin irritation and allergy, respectively, and the results showed that they were safe and non-irritating.

[0087] Test Example 2-Magnetic Stability Test

[0088] 1. Temperature stability test

[0089] 1. High temperature test:

[0090] The high gloss pearlescent magnetic powder samples of Examples 1-5 and Comparative Examples 1-4 were placed in a high temperature oven, set at 80°C and maintained for 48 hours. After treatment, the samples were taken out and cooled to room temperature, and the magnetic strength of the magnetic powder was measured using a magnetic measuring instrument. The magnetic strength data was recorded and compared with the initial magnetic strength to calculate the change rate of the magnetic strength.

[0091] 2. Low temperature test:

[0092] The other part of the samples was placed in a low-temperature refrigerator, set at -20°C for 48 hours, and the samples were taken out after treatment. After the samples were taken out, they were allowed to return to room temperature, and the magnetic strength of the magnetic powder was measured and compared with the initial magnetic strength to calculate the rate of change of the magnetic strength.

[0093] Change rate of magnetic strength = (initial magnetic strength - magnetic strength after specific conditions) / initial magnetic strength × 100%

[0094] 3. Test results

[0095] Table 1:

[0096]

[0097] 2. Humidity stability test

[0098] 1. High humidity test:

[0099] The high gloss pearlescent magnetic powder samples of Examples 1-5 and Comparative Examples 1-4 were placed in a constant temperature and humidity chamber, and the relative humidity was set to 90% and the temperature was set to 25°C for 1 month. After the test, the samples were taken out, and the magnetic strength of the magnetic powder was measured using a magnetic measuring instrument. The magnetic strength was compared with the initial magnetic strength, and the rate of change of the magnetic strength was calculated.

[0100] 2. Low humidity test:

[0101] Put another part of the above samples into a constant temperature and humidity chamber, set the relative humidity to 20%, and the temperature to room temperature, and test them for the same time as the high humidity test, measure and record the magnetic intensity data, and calculate the change rate.

[0102] Change rate of magnetic strength = (initial magnetic strength - magnetic strength after specific conditions) / initial magnetic strength × 100%

[0103] 3. Test results

[0104] Table 2:

[0105]

[0106] From the results of Table 1 and Table 2, it can be seen that the embodiment group and the comparative example group are compared, and it can be seen that the embodiment group of the present invention still has relatively stable magnetism at high temperature 80°C and low temperature -20°C, high humidity 90% and low humidity 20%, indicating that the magnetic metal oxide of the present invention treats the magnetic powder by surfactants, etc., thereby enhancing its binding force with the matrix and resistance to temperature changes. The modified magnetic nanoparticles have high stability and temperature resistance, and are not easy to lose magnetism when the temperature changes. At the same time, the pearlescent pigment is doped with the magnetic nanoparticles, and then the process parameters such as ball milling and ultrasound are reasonably set, so that the structure of the magnetic powder is more uniform and stable, thereby improving the temperature stability.

[0107] Test Example 3 - In vitro oil control evaluation

[0108] 1. Cell culture: Immortalized human sebocytes SZ95 were cultured in vitro in 96-well plates to establish a sebum secretion model. The cells were divided into 10 groups, with 3 parallel experiments in each group.

[0109] 2. Stimulant treatment: 5-α-DHT was used as a stimulant to simulate the sebum secretion of sebaceous cells and establish an in vitro sebum secretion model.

[0110] 3. Adding high-gloss pearlescent magnetic powder: Apply the high-gloss pearlescent magnetic powder of Examples 1-5 and Comparative Examples 1-4 to the cultured sebaceous cells at a dosage of 30 μg / well, and then test its effect on sebum secretion. For the control group, no high-gloss pearlescent magnetic powder was added.

[0111] 4. Fluorescent staining: Use fluorescent dyes such as Nile red to stain lipid droplets, and observe and quantitatively analyze the proliferation and differentiation of sebaceous cells, as well as the amount of sebum secretion, using a microscope, fluorescence instrument or flow cytometer.

[0112] 5. Calculation of oil inhibition rate: By comparing the fluorescence intensity of the sample treatment group and the control group, the oil inhibition rate is calculated to evaluate the oil control effect of the sample.

[0113] 6. Test results:

[0114] Table 3:

[0115]

[0116]

[0117] By comparing the examples and the comparative examples, it can be seen that the formula and preparation process of the high-gloss pearlescent magnetic powder of the present invention have an important influence, and the oil inhibition rates of Examples 1 to 5 are all above 50%, among which Example 3 reaches the highest 60.1%. This shows that the high-gloss pearlescent magnetic powder in these examples shows a significant effect of inhibiting oil secretion in the in vitro oil control test.

[0118] Compared with Example 1, the formula ratio of high-gloss pearlescent magnetic powder in Example 3 can achieve better oil control effect. The nanoparticles modified by magnetic metal oxides and other ingredients such as natural fish scale pearlescent pigments, mica powder, titanium dioxide, etc. work together to play an oil control role. Compared with Example 2, natural fish scales have a certain porous structure and a large specific surface area after a specific treatment process, which can absorb oil on the skin surface; fish scale pearlescent pigments can affect the microenvironment on the skin surface, absorb moisture or adjust the pH value of the skin surface, etc., to change the water-oil balance of the skin, thereby reducing oil secretion.

[0119] Compared with Comparative Example 3, surface modification of the magnetic metal oxide by a silicone surface treatment agent can enhance its compatibility with other ingredients in the cosmetic formula, improve dispersibility and stability, and can also enhance the adsorption performance of the magnetic powder, which helps to adsorb oil on the skin surface, thereby achieving the effect of oil control; the particle size of the magnetic metal oxide is precisely controlled (1-10nm), which can enable it to better penetrate into the skin pores, effectively adsorb and control sebum secretion, and reduce oily shine; during the preparation process, a pulsed magnetic field oscillation curing is applied. This magnetic field treatment can enhance the crystallinity and magnetic properties of the magnetic particles, help to form a uniformly distributed magnetic network in the cosmetics, and enhance its adsorption and oil control capabilities.

[0120] Compared with Comparative Example 4, magnetic nanoparticles are added to the pearlescent pigment suspension, and the magnetic particles and the pearlescent pigment are fully mixed by ultrasonic stirring to form pearlescent magnetic powder. This doping treatment makes the pearlescent magnetic powder finally obtained have stronger adsorption capacity. The magnetic nanoparticles themselves have a certain performance of adsorbing grease, and after combining with the pearlescent pigment, their surface area increases and the adsorption sites increase, so that the grease on the skin surface can be more effectively adsorbed.

[0121] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cosmetic high-gloss pearlescent magnetic powder, characterized in that: The invention comprises the following raw materials in parts by weight: 10-30 parts of magnetic metal oxide, 30-50 parts of mica powder, 10-20 parts of titanium dioxide, 1-5 parts of silicone surface treatment agent, 5-15 parts of pearlescent pigment, 3-10 parts of adhesive, 0.1-1 parts of antioxidant and 0.5-1 parts of active agent; the magnetic metal oxide comprises but is not limited to ferroferric oxide, ferric oxide and zinc oxide; the particle size of the mica powder is 10-50 μm; the silicone surface treatment agent comprises but is not limited to polydimethylsiloxane, polymethylhydrogensiloxane or epoxy-modified silicone; the adhesive is any one of polyvinyl alcohol, polyurethane, cellulose or vinyl acetate.

2. A cosmetic high-gloss pearlescent magnetic powder as claimed in claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: 20 parts of magnetic metal oxide, 40 parts of mica powder, 15 parts of titanium dioxide, 3 parts of silicone surface treatment agent, 10 parts of pearlescent pigment, 7 parts of adhesive, 0.5 parts of antioxidant and 0.8 parts of active agent.

3. A cosmetic high-gloss pearlescent magnetic powder as claimed in claim 1, characterized in that: The silicone surface treatment agent includes but is not limited to polydimethylsiloxane, polymethylhydrogensiloxane or epoxy-modified silicone.

4. A cosmetic high-gloss pearlescent magnetic powder as claimed in claim 1, characterized in that: The pearlescent pigment is a natural fish scale pearlescent pigment, which is prepared by washing scales of hairtail, sardine or herring, adding the scales into an ethanol solution with a mass concentration of 50-90%, oscillating and dissolving the scales at 40-60°C and an oscillation frequency of 400-800rpm for 3-5h, wherein the mass volume ratio of the scales to the solvent is 35-55:100 g / mL, taking the scales out, filtering, washing the precipitate, drying the scales at 50-100°C for 6-10h, and grinding the scales out to a particle size of 10-30μm.

5. The cosmetic high-gloss pearlescent magnetic powder according to claim 1, characterized in that: The antioxidants are butylated hydroxyanisole and diphenylamine.

6. A cosmetic high-gloss pearlescent magnetic powder as claimed in claim 1, characterized in that: The active agent is cocamidopropyl betaine and lecithin in a volume ratio of 5-8:1-3.

7. The method for preparing a cosmetic high-gloss pearlescent magnetic powder according to claim 1, characterized in that: The following steps are involved: S1. Modification of magnetic metal oxides: The magnetic metal oxides are cleaned and dried for pretreatment, ground to a particle size of 1-10 nm, placed in a vacuum chamber, and evacuated to 1×10 4 Pa or more, introduce a siloxane surface treatment agent to heat it to 200-300°C, apply a pulsed magnetic field to oscillate and cure for 10-30 minutes, the pulsed magnetic field frequency is 10-15 Hz, the pulsed magnetic field voltage is 100-250 V, and the magnetic induction intensity is 0.1-2.0 T to obtain magnetic nanoparticles; S2. Preparing a pearlescent pigment suspension: dispersing the pearlescent pigment in water, with a mass volume ratio of the pearlescent pigment to water of 5-10:50 g / mL, to prepare a suspension; S3, doping treatment: adding the magnetic nanoparticles prepared in S1 to the pearlescent pigment suspension, subjecting to ultrasonic stirring treatment for 20-40 minutes, filtering, washing and drying to obtain pearlescent magnetic powder; S4, mixing: the pearlescent magnetic powder, mica powder, titanium dioxide and the active agent are uniformly mixed, and stirred at a speed of 500-800 rpm for 25-35 min to obtain a mixed powder; S5. Ball milling: Add the binder and antioxidant to the mixed powder and mill until uniform high-gloss pearlescent magnetic powder with a particle size of 10-30 μm is formed. The ball milling speed is 300-500 rpm and the stirring time is 40-80 min.

8. The method for preparing a cosmetic high-gloss pearlescent magnetic powder according to claim 7, characterized in that: The S3 ultrasonic frequency is 20-100kHz, the ultrasonic power is 50-200W, the ultrasonic temperature is 40-60°C, and the stirring rate is 500-800rpm.

9. Use of the cosmetic high-gloss pearlescent magnetic powder according to any one of claims 1 to 4 in cosmetics.

10. The use according to claim 9, characterized in that: The cosmetics are foundation, blush, eye shadow or lipstick.

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