Preparation process for powder product

Abstract

A preparation process for a powder product that has good dispersibility, can reduce skin greasiness without causing dryness, and can achieve outstanding optical fading effects and a luxurious, soft, and elastic texture. In the preparation process, mica powder is modified, which not only greatly shortens manufacturing time but also results in powder cosmetics that have good flatness and great consistency and are not easy to demold.

Description

Preparation process of powder product

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202311414433.7, filed on October 30, 2023, entitled “A Process for Preparing Powder Products,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the technical field of medical, dental or cosmetic preparations, and in particular to a preparation process of a powder product. Background Art

[0004] With the increasing popularity of color cosmetics, powder raw materials are increasingly used in cosmetics. Powders used in the cosmetics industry are primarily categorized into four main types: pigment powders, white powders, body powders, and pearlescent powders. Pigment powders are used to adjust the color tone of cosmetics; white powders provide concealing, whitening, and UV protection; body powders come in a variety of types, primarily used to adjust product spreadability, adsorption, skin adhesion, texture, reduce visual focus, and carry active ingredients; and pearlescent powders enhance product gloss and texture.

[0005] Cosmetic powders ideally meet multiple requirements, including safety, functionality, color, shape, fineness, and feel. Therefore, depending on the application, powders must undergo surface treatment or be combined with multiple powders to meet basic cosmetic compatibility, functionality, and usability requirements. Surface modification can improve the dispersion of particles within the powder, enhance its stability and dispersibility in organic solvents, increase its surface activity, and improve its durability. Surface modification can impart a new feel or specific properties to powders, significantly increasing the added value of cosmetics.

[0006] Chinese patent 202011521751X provides a composite mica powder for cosmetics with oil-control properties and a preparation method thereof. The composite mica powder of the invention is coated on the surface of cosmetic-grade mica powder with zinc oxide and hydroxyapatite, wherein the weight ratio of zinc oxide, hydroxyapatite and cosmetic-grade mica powder is (1-30): (1-30): 100. The invention uses mica, a large-size, high-diameter-to-thickness ratio sheet-like structure material, as a carrier, and coats it with a composite layer of zinc oxide and hydroxyapatite to form a structurally stable multifunctional composite material with high-strength selective adsorption capacity for unsaturated fatty acids (the main component of oil in human sweat) without adsorbing other oil-like substances in cosmetic formulas; quickly solidifies the unsaturated fatty acids in sebum; the color will not become dull after oil absorption, etc., thereby making the makeup more lasting.

[0007] Chinese Patent No. 2021113429161 provides a modified powder comprising a base powder and a surface modifier attached to the base powder. The surface modifier comprises a perfluoropolyether and a fluorosilane, wherein the mass of each of the perfluoropolyether and the fluorosilane is 0.5%-10% of the mass of the base powder. The present invention also relates to a method for preparing the modified powder and a cosmetic product containing the modified powder. This invention utilizes perfluoropolyether and fluorosilane to modify the base powder, resulting in the modified powder having moderate oil absorption while maintaining its hydrophobic and oleophobic properties. Therefore, when the modified powder of this invention is used in cosmetics, the cosmetics exhibit good skin adhesion, excellent skin feel, stable quality, and excellent safety for organisms and the environment. In particular, when the modified powder of this invention is used in color cosmetics, the moderate oil absorption value results in excellent long-lasting makeup. Furthermore, the surface modification process of the base powder of the present invention is simple and highly safe.

[0008] The surface of untreated powder has strong polarity, poor oil compatibility and is difficult to disperse. The existing technology for treating powder mostly adopts a single treatment method. The treated powder still has various defects in use or skin feel. Therefore, it is necessary to further improve the dispersion of powder in the system, reduce agglomeration, enhance the stability of the formula, and at the same time improve the moisturizing, transparency, skin-fitting, and long-lasting feel during use.

[0009] Summary of the Invention

[0010] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a preparation process for powder products.

[0011] Mica powder is the general term for a group of complex hydrated aluminum silicates. It is a light gray scaly crystalline powder, mostly monoclinic, in the form of pseudohexagonal flakes. The mica powder used in cosmetics is mainly muscovite and sericite. Muscovite is soft and shiny, while sericite is soft and smooth to the touch, and the particles do not agglomerate. Because it is a very thin flake crystal (0.2-0.5 μm), it is nearly transparent when applied to the skin and does not turn white. Mica powder has strong adhesion and moderate gloss and softness. After special processing, it can be made into synthetic mica, which increases whiteness while improving the brightness and durability of the makeup. However, mica powder has a poor skin feel and cannot be well integrated with other oily substances in cosmetics, which greatly affects the consumer's use effect and experience.

[0012] In the present invention, mica powder is modified and obtained by multi-step treatment with titanate and modified polyurethane, wherein titanate can bond with surfactant groups (-OH) to form a stable chemical bond connected to the pigment surface. After treatment, dense fatty acid groups can be oriented on the surface of the powder, so it can be well wetted by most organic components, including some high-polarity oils and fats, and has a strong waterproof effect. After the mica powder is treated with titanate, the powder surface changes from negative to positive, and has excellent fit with the skin that is itself negatively charged, thereby achieving a better skin feel. The modified polyurethane has amphiphilic properties due to the grafting of hydrophilic and hydrophobic groups, which can not only reduce the greasy feeling but not dryness, but also the polyurethane can give the powder a soft cushion feeling, and can also achieve an excellent optical lightening effect and a luxurious elastic and soft texture.

[0013] In the preparation process for cosmetics containing this composition, the material is placed in a mesh to vibrate, aiding its flow and reducing the formation of pores. The mesh supports the material, making it more solid and smoothing the bottom. Vacuum degassing reduces pores and surface pigmentation through negative pressure. Microwave and hot air drying, under the influence of rapidly changing high-frequency electromagnetic fields, induce polarity changes in polar molecules, causing frictional movement of the molecules. The electromagnetic field energy of the microwaves is converted into thermal energy of the medium, achieving the purpose of heating and drying. The strong penetrating power of microwaves heats the material uniformly both inside and outside, eliminating the problem of being dry on the outside and wet on the inside. The product is heated evenly, has a stable texture when applied, and maximizes the preservation of the material's activity and original color. The resulting body heat source significantly shortens the heat conduction time required in conventional heating, saving a significant amount of drying time. This process not only significantly reduces drying time, but also produces powdered cosmetics with excellent smoothness, consistency, and ease of demolding.

[0014] To achieve the above object, the present invention provides a process for preparing a powder product, comprising the following steps:

[0015] X1 preheats the mold to 20-350℃, which is close to the material temperature;

[0016] X2 adds the raw material mixture to the filling machine at a quantitative rate. The filling temperature is 20-100°C. According to the product weight requirements, the filling equipment is used to quantitatively fill the material with an accuracy of ≤±0.2g.

[0017] X3 puts the filled material into the grid, and the bottom vibrates to assist the material flow, with a vibration frequency of 100-300Hz;

[0018] X4 vacuums the vibrated material at a pressure of 0.03 to -0.1 MPa for 1 to 30 seconds.

[0019] X5 cools the vacuumed material at a temperature of -70 to 25°C for 3 to 10 minutes;

[0020] After cooling, X6 is dried by microwave and hot air circulation, with a power of 25-30kW, a frequency of 300MHz-300GHz, a cell wavelength of 1m-1mm, a linear speed of 0.5-2m / min, and a chamber temperature of 25-90°C, until the moisture content is ≤5%;

[0021] After drying, X7 is demoulded and formed by a demoulding machine and then packaged.

[0022] Preferably, the preparation process of the raw material mixture comprises the following steps:

[0023] S1: adding 0.1-1 parts by weight of a thickener and 0.3-1 parts by weight of a preservative to 40-60 parts by weight of water and stirring at 20-90° C. to obtain an aqueous phase;

[0024] S2: 0.5-3 parts by weight of an emulsifier, 0.1-5 parts by weight of a binder, and 1-5 parts by weight of a moisturizer are stirred uniformly at 20-90° C. to obtain an oil phase;

[0025] S3: uniformly mixing 0.1 to 5 parts by weight of modified mica powder, 2 to 10 parts by weight of an anti-caking agent, and 10 to 50 parts by weight of a colorant to obtain a powder mixture;

[0026] S4: Evenly mix the water phase and the oil phase and then add the powder mixture to obtain a raw material mixture.

[0027] Furthermore, the thickener is one or a mixture of two or more of carrageenan, potassium chloride, gellan gum, xanthan gum, hydroxyethyl cellulose, carbomer, ethylene / acrylic acid copolymer, sodium alginate, sodium polyacrylate, guar gum, pectin, and dextrin.

[0028] Furthermore, the preservative is one or a mixture of two or more of phenoxyethanol, chlorphenesin, benzoic acid, benzyl alcohol, polyaminopropyl biguanide, paraben, ethylhexylglycerin, caprylyl glycol, glyceryl caprylate, pentylene glycol, and cymene.

[0029] Furthermore, the emulsifier is one or a mixture of two or more of Tween-60, Tween-80, steareth-2, steareth-21, PEG-100 stearate, sucrose stearate, lecithin, hydrogenated lecithin, polyglyceryl-10 laurate, polyglyceryl-10 myristate, polyglyceryl-10 oleate, C12-20 acid PEG-ester, sodium lauryl sulfate, and potassium cetyl phosphate.

[0030] Furthermore, the adhesive is a mixture of one or two or more of cetyl ethylhexanoate, octyldodecanol stearoyl stearate, diisostearyl malate, octyldodecanol, olive oil, meadowfoam seed oil, octyl polymethylsiloxane, and polydimethylsiloxane.

[0031] Furthermore, the moisturizing agent is squalane.

[0032] Furthermore, the anti-caking agent is trimethylol hexyllactone cross-linked polymer.

[0033] Furthermore, the colorant is at least one of sodium calcium borosilicate, tin oxide, titanium dioxide, iron oxide, and pearlescent pigment.

[0034] Preferably, the preparation method of the modified mica powder comprises the following steps:

[0035] Step 1: Preheat 5-10 parts by weight of mica to 70-80° C., add 1 wt% titanate acetone solution in three portions with a stirring interval of 4-5 minutes, stir for 15-30 minutes, and dry after stirring;

[0036] Step 2: Add 15 to 40 parts by weight of 2-isopropyl-2-oxazoline and 1 to 2.5 parts by weight of 1,4-dibromo-2-butene to 60 to 100 parts by weight of acetonitrile, heat to 70 to 95° C. and stir under an argon atmosphere for 16 to 28 hours. After cooling to room temperature, add 0.5 mol / L methanol solution of potassium hydroxide to quench, add glacial ether to dilute, and filter. The residue is dried and used in the next step;

[0037] Step 3: 5 to 10 parts by weight of the product of the previous step and 5 to 10 parts by weight of dipolylactic acid-polyethylene glycol are added to 50 to 100 parts by weight of dimethyl sulfoxide, and then 0.05 to 0.1 parts by weight of di-n-butyltin dilaurate is added. 1.5 to 2.5 parts by weight of hexamethylene diisocyanate is added under an argon atmosphere, and the mixture is stirred at 55 to 65° C. for 20 to 30 hours. 1.2 to 2.4 parts by weight of 1,4-butanediol is added and the mixture is continued to be stirred at 55 to 65° C. for 70 to 80 hours. After cooling to room temperature, ether is added to dilute the mixture, and a precipitate is filtered. The residue is dried and then ground and sieved to obtain a modified polyurethane.

[0038] Step 4: Add the mica powder in step 1 to the powdering pot, powder it once at 2000-5000 rpm for 50-90 seconds, add the modified polyurethane to the powdering pot, pour it into the stirring pot twice, stir it once each time, each time for 50 seconds, rotate at 2000-5000 rpm, divide the material into portions and discharge it, dry it at 80-120°C for 1-5 hours, check that the hydrophobicity is qualified, rotate at 6000-12000 rpm, and crush it twice with needle airflow to obtain the modified powder.

[0039] Beneficial effects of the present invention:

[0040] 1. Compared with the prior art, the powder product of the present invention has good dispersibility, which can reduce the greasiness of the skin without drying it out, and can also achieve an excellent optical lightening effect and a luxurious elastic and soft texture.

[0041] 2. Compared with the prior art, the preparation process of the powder product in the present invention not only greatly reduces the production time, but also the obtained powder product has good flatness and consistency and is not easy to demold. DETAILED DESCRIPTION

[0042] Dipolylactic acid-polyethylene glycol, Mw=2000, Guangzhou Carbon Technology.

[0043] Phenoxyethanol / ethylhexylglycerin, PE9010, Jining Tangyi Chemical.

[0044] Trimethylol hexyllactone cross-linked polymer, Hubei Shuaiyan Ligao Biopharmaceuticals.

[0045] Comparative Example 1

[0046] A process for preparing a pressed powder comprises the following steps:

[0047] X1 preheats the mold to 75°C, which is close to the material temperature;

[0048] X2 adds the raw material mixture to the filling machine at a quantitative rate, with a filling temperature of 80°C. According to the product weight requirements, the filling equipment quantitatively fills the material with an accuracy of ≤±0.2g;

[0049] X3 puts the filled material into the grid, and the bottom vibrates to assist the material flow, with a vibration frequency of 200Hz;

[0050] X4 vacuums the vibrated material to a pressure of -0.1 MPa for 20 seconds.

[0051] X5 cools the vacuumed material to 20°C for 5 minutes;

[0052] After cooling, X6 is dried by microwave and hot air circulation, with a power of 30kW, a frequency of 500MHz, a cell wavelength of 1mm, a line speed of 1m / min, and a chamber temperature of 45°C, until the moisture content is ≤5%;

[0053] After drying, X7 is demoulded and formed by a demoulding machine and then packaged.

[0054] The preparation process of the raw material mixture comprises the following steps:

[0055] S1: Add 1g of carrageenan, 1g of xanthan gum, 1g of potassium chloride, and 3g of phenoxyethanol / ethylhexylglycerin to 500mL of water and stir at 65°C to obtain an aqueous phase:

[0056] S2: 10 g of Tween-60, 10 g of cetyl ethylhexanoate, 15 g of octyldodecanol stearoyl stearate, and 20 g of squalane were stirred at 75° C. to obtain an oil phase;

[0057] S3: 35 g of mica powder, 25 g of trimethylol hexyl lactone cross-linked polymer, 100 g of sodium calcium borosilicate, 150 g of tin oxide, and 150 g of CI77891 were uniformly mixed to obtain a powder mixture;

[0058] S4: Evenly mix the water phase and the oil phase and then add the powder mixture to obtain a raw material mixture.

[0059] Example 1

[0060] A process for preparing a pressed powder comprises the following steps:

[0061] X1 preheats the mold to 75°C, which is close to the material temperature;

[0062] X2 adds the raw material mixture to the filling machine at a quantitative rate, with a filling temperature of 80°C. According to the product weight requirements, the filling equipment quantitatively fills the material with an accuracy of ≤±0.2g;

[0063] X3 puts the filled material into the grid, and the bottom vibrates to assist the material flow, with a vibration frequency of 200Hz;

[0064] X4 vacuums the vibrated material to a pressure of -0.1 MPa for 20 seconds.

[0065] X5 cools the vacuumed material to 20°C for 5 minutes;

[0066] After cooling, X6 is dried by microwave and hot air circulation, with a power of 30kW, a frequency of 500MHz, a cell wavelength of 1mm, a line speed of 1m / min, and a chamber temperature of 45°C, until the moisture content is ≤5%;

[0067] After drying, X7 is demoulded and formed by a demoulding machine and then packaged.

[0068] The preparation process of the raw material mixture comprises the following steps:

[0069] S1: Add 1 g of carrageenan, 1 g of xanthan gum, 1 g of potassium chloride, and 3 g of phenoxyethanol / ethylhexylglycerin to 500 mL of water and stir at 65°C to obtain an aqueous phase;

[0070] S2: 10 g of Tween-60, 10 g of cetyl ethylhexanoate, 15 g of octyldodecanol stearoyl stearate, and 20 g of squalane were stirred at 75° C. to obtain an oil phase;

[0071] S3: 35 g of modified mica powder, 25 g of trimethylol hexyl lactone cross-linked polymer, 100 g of sodium calcium borosilicate, 150 g of tin oxide, and 150 g of CI77891 were mixed to obtain a powder mixture;

[0072] S4: Evenly mix the water phase and the oil phase and then add the powder mixture to obtain a raw material mixture.

[0073] The preparation method of the modified mica powder comprises the following steps:

[0074] Step 1: Preheat 75 g of mica to 75° C., add 750 mL of 1 wt% titanate acetone solution in three portions with a 5-minute interval between each addition, stir for 25 minutes, and dry after stirring for later use;

[0075] Step 2: Add 300 g of 2-isopropyl-2-oxazoline and 20 g of 1,4-dibromo-2-butene to 700 mL of acetonitrile, heat to 75 ° C and stir under an argon atmosphere for 20 h. After cooling to room temperature, add 0.5 mol / L methanol solution of potassium hydroxide to quench, add glacial ether to dilute and filter, and the residue is dried and used in the next step;

[0076] Step 3: Add 75 g of the product from the previous step and 75 g of dipolylactic acid-polyethylene glycol to 1 L of dimethyl sulfoxide, then add 0.6 g of di-n-butyltin dilaurate, add 20 g of hexamethylene diisocyanate under an argon atmosphere, stir at 50 ° C for 24 h, add 19 g of 1,4-butanediol, and continue stirring at 60 ° C for 72 h. After cooling to room temperature, add ether to dilute, filter after the precipitate appears, and grind and sieve the residue after drying to obtain a modified polyurethane;

[0077] Step 4: Add the mica powder in step 1 to the powdering pot, powder it once at 3500rpm for 60s, add 10g of modified polyurethane to the powdering pot, pour it into the stirring pot twice, stir it once each time, each time for 50s, speed 3000rpm, pack and discharge, dry it at 100℃ for 3h, check that the hydrophobicity is qualified, and then grind it twice with needle airflow at a speed of 8000rpm to obtain the modified powder.

[0078] Example 2

[0079] A process for preparing a pressed powder comprises the following steps:

[0080] X1 Preheat the mold to 75°C, which is close to the material temperature:

[0081] X2 adds the raw material mixture to the filling machine at a quantitative rate, with a filling temperature of 80°C. According to the product weight requirements, the filling equipment quantitatively fills the material with an accuracy of ≤±0.2g;

[0082] X3 puts the filled material into the grid, and the bottom vibrates to assist the material flow, with a vibration frequency of 200Hz;

[0083] X4 vacuums the vibrated material to a pressure of -0.1 MPa for 20 seconds.

[0084] X5 cools the vacuumed material to 20°C for 5 minutes;

[0085] After cooling, X6 is dried by microwave and hot air circulation, with a power of 30kW, a frequency of 500MHz, a cell wavelength of 1mm, a line speed of 1m / min, and a chamber temperature of 45°C, until the moisture content is ≤5%;

[0086] After drying, X7 is demoulded and formed by a demoulding machine and then packaged.

[0087] The preparation process of the raw material mixture comprises the following steps:

[0088] S1: Add 1 g of carrageenan, 1 g of xanthan gum, 1 g of potassium chloride, and 3 g of phenoxyethanol / ethylhexylglycerin to 500 mL of water and stir at 65°C to obtain an aqueous phase;

[0089] S2: 10 g of Tween-60, 10 g of cetyl ethylhexanoate, 15 g of octyldodecanol stearoyl stearate, and 20 g of squalane were stirred at 75° C. to obtain an oil phase;

[0090] S3: 35 g of modified mica powder, 25 g of trimethylol hexyl lactone cross-linked polymer, 100 g of sodium calcium borosilicate, 150 g of tin oxide, and 150 g of CI77891 were mixed to obtain a powder mixture;

[0091] S4: Evenly mix the water phase and the oil phase and then add the powder mixture to obtain a raw material mixture.

[0092] The preparation method of the modified mica powder comprises the following steps:

[0093] Preheat 75 g of mica to 75° C., add 750 mL of 1 wt% titanate acetone solution in three portions with a 5-minute interval between each addition, stir for 25 minutes, and dry after stirring.

[0094] Example 3

[0095] A process for preparing a pressed powder comprises the following steps:

[0096] The process is the same as that in Example 1, except that the operation in step X3 is not performed.

[0097] Example 4

[0098] A process for preparing a pressed powder comprises the following steps:

[0099] The process is the same as that in Example 1, except that the operation in step X4 is not performed.

[0100] Example 5

[0101] A process for preparing a pressed powder comprises the following steps:

[0102] The process is the same as that in Example 1, the only difference being that the microwave hot air drying in step X6 is replaced by conventional drying.

[0103] Test Example 1

[0104] The pressed powders in Control Example 1 and Examples 1-2 were given to 30 cosmetic professionals for use. The powder products were applied on the skin, and the "lightness, smoothness, absence of powdery feeling, and dryness upon application (on the skin)" were evaluated on a 5-point scale (0 point: no lightness or smoothness, very high powdery feeling and dryness; 1 point: very low lightness or smoothness, strong powdery feeling and dryness; 2 points: very low lightness or smoothness, strong powdery feeling and dryness; 3 points: relatively low lightness or smoothness, powdery feeling, and dryness; 4 points: relatively high lightness or smoothness, relatively low powdery feeling and dryness; 5 points: extremely high lightness or smoothness, almost no powdery feeling or dryness).

[0105] Table 1 Usability test of pressed powder

[0106] Comparison of the control examples with the examples reveals that unmodified mica powder presents numerous drawbacks. However, titanate treatment improves dispersibility due to the oriented fatty acid groups on the powder's surface, reducing its powdery feel. Furthermore, the positively charged surface provides better adhesion to negatively charged skin. In Example 1, the multi-step treatment of the mica powder with titanate and modified polyurethane not only improves the powdery feel and adherence, but also reduces greasiness without causing dryness. The polyurethane imparts a cushiony feel to the powder, achieving an excellent optical lightening effect and a luxuriously elastic, soft texture.

[0107] Test Example 2

[0108] The pressed powders obtained in Examples 1 and 3-5 were subjected to appearance and block shape observation and drop performance test in accordance with QB / T1976-2004 "Cosmetic Powder Blocks". Five samples were taken from each group, the powder box was opened and the accessories were taken out. The powder box was placed at a height of 50 cm with the bottom of the powder box facing down and dropped horizontally onto a wooden board. The damage was observed and the samples were qualified when ≤1 sample was damaged.

[0109] Table 2 Cosmetic appearance and drop test results

[0110] The cosmetics' appearance and drop tests demonstrate that, in the preparation process for cosmetics containing this composition, vibrating the material through a mesh facilitates flow and reduces the formation of pores. The mesh supports the material, making it more solid and smoothing the bottom. Vacuum degassing reduces pores and surface pigmentation through negative pressure, resulting in a smoother appearance and surface consistency compared to Examples 3-5. Microwave and hot air drying, under the influence of rapidly changing high-frequency electromagnetic fields, induce polarity changes in polar molecules, causing frictional movement. The microwave's electromagnetic field energy is converted into thermal energy for the medium, achieving the purpose of heating and drying. The microwave's strong penetrating power allows for uniform heating of the material's interior and exterior, preventing dry exterior and wet interior. The product is heated evenly, has a stable application texture, and maximizes the preservation of the material's activity and original color. The resulting internal heat source significantly shortens the heat conduction time required for conventional heating, resulting in a compact with excellent flatness, consistency, and ease of demolding. Therefore, the compact of Example 1 is less susceptible to breakage from drops than that of Example 5.

[0111] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A process for preparing a powder product, characterized in that: The steps include: Heat the mold to 20-350℃ for preheating, the temperature is close to the material temperature; Add the raw material mixture to the filling machine at a quantitative rate, with a filling temperature of 20-100°C. According to the product weight requirements, the filling equipment is used to quantitatively fill the material with an accuracy of ≤±0.2g; Put the filled material into the grid, and vibrate at the bottom to assist the material flow, with a vibration frequency of 100-300Hz; The vibrated material is vacuumed at a pressure of 0.03 to -0.1 MPa for 1 to 30 seconds; Cool the vacuumed material at a temperature of -70 to 25°C for 3 to 10 minutes; After cooling, microwave and hot air circulation drying is performed, with a power of 25-30kW, a frequency of 300MHz-300GHz, a cell wavelength of 1m-1mm, a linear speed of 0.5-2m / min, a temperature in the cavity of 25-90°C, and drying to a moisture content of ≤5%; After drying, the product is demoulded by a demoulding machine and packaged.

2. The process for preparing the powder product according to claim 1, characterized in that: The powder product is one of eye shadow, blush and pressed powder.

3. The process for preparing the powder product according to claim 1 or 2, characterized in that: The preparation method of the raw material mixture is as follows: Add 0.1 to 1 parts by weight of a thickener and 0.3 to 1 parts by weight of a preservative to 40 to 60 parts by weight of water and stir evenly at 20 to 90° C. to obtain an aqueous phase; 0.5 to 3 parts by weight of an emulsifier, 0.1 to 5 parts by weight of a binder, and 1 to 5 parts by weight of a moisturizer are stirred uniformly at 20 to 90° C. to obtain an oil phase; 0.1 to 5 parts by weight of modified mica powder, 2 to 10 parts by weight of an anti-caking agent, and 10 to 50 parts by weight of a colorant are uniformly mixed to obtain a powder mixture; The water phase and the oil phase are mixed evenly and then the powder mixture is added to obtain a raw material mixture.

4. The process for preparing the powder product according to claim 3, characterized in that: The thickener is one or a mixture of two or more of carrageenan, gellan gum, potassium chloride, xanthan gum, hydroxyethyl cellulose, carbomer, ethylene / acrylic acid copolymer, sodium alginate, sodium polyacrylate, guar gum, pectin and dextrin.

5. The process for preparing the powder product according to claim 3, characterized in that: The preservative is one or a mixture of two or more of phenoxyethanol, chlorphenesin, benzoic acid, benzyl alcohol, polyaminopropyl biguanide, paraben, ethylhexylglycerin, caprylyl glycol, glyceryl caprylate, pentylene glycol and cymene.

6. The process for preparing the powder product according to claim 3, characterized in that: The emulsifier is one of Tween-60, Tween-80, steareth-2, steareth-21, PEG-100 stearate, sucrose stearate, lecithin, hydrogenated lecithin, polyglyceryl-10 laurate, polyglyceryl-10 myristate, polyglyceryl-10 oleate, C12-20 acid PEG-ester, sodium lauryl sulfate, and potassium cetyl phosphate, or a mixture of two or more thereof.

7. The process for preparing the powder product according to claim 3, characterized in that: The adhesive is one or a mixture of two or more of cetyl ethylhexanoate, octyldodecanol stearyloxy stearate, diisostearyl malate, octyldodecanol, olive oil, meadowfoam seed oil, and octyl polymethicone and polydimethicone.

8. The process for preparing the powder product according to claim 3, characterized in that: The moisturizing agent is squalane; the anti-caking agent is trimethylol hexyllactone cross-linked polymer; the colorant is at least one of sodium calcium borosilicate, tin oxide, titanium dioxide, iron oxide, and pearlescent pigment. The adjustment mechanism is used to move the slurry between the detection areas along the width direction of the target pole piece according to the weight value of the slurry in each detection area.

9. The process for preparing the powder product according to claim 3, characterized in that: The preparation method of the modified mica powder comprises the following steps: Preheat the mica powder to 70-80°C, add 1wt% titanate acetone solution in 3 portions while stirring, Each time, stir for 15 to 30 minutes with an interval of 4 to 5 minutes. After stirring, dry and set aside. Add 2-isopropyl-2-oxazoline and 1,4-dibromo-2-butene to acetonitrile, heat to 70-95°C and stir for 16-28h under argon atmosphere, cool to room temperature, add 0.5 mol / L methanol solution of potassium hydroxide to quench, add icy ether to dilute and filter, dry the residue and use it in the next step; The product of the previous step and dipolylactic acid-polyethylene glycol are added to dimethyl sulfoxide, and then dibutyltin dilaurate is added, and hexamethylene diisocyanate is added under an argon atmosphere, and stirred at 55-65° C. for 20-30 hours, 1,4-butanediol is added, and stirring is continued at 55-65° C. for 70-80 hours, and after cooling to room temperature, ether is added for dilution, and a precipitate is filtered, and the residue is dried and ground and sieved to obtain a modified polyurethane; Add dried mica powder to the powdering pot, powder once at 2000-5000rpm for 50-90s, add modified polyurethane to the powdering pot, pour into the stirring pot twice, stir once after each addition, each time for 50s, speed 2000-5000rpm, pack and discharge, dry at 80-120℃ for 1-5h, check that the hydrophobicity is qualified, and then grind twice with needle airflow at 6000-12000rpm to obtain the modified powder.

10. A powder product, characterized in that: Prepared by the method according to any one of claims 1 to 9.

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