Preparation method of cosmetic freeze-dried baking powder

Abstract

The invention discloses a preparation method of cosmetic freeze-drying baking powder. The preparation method comprises the following steps: S1, raw material mixing: uniformly mixing mica, a vinyl polydimethylsiloxane / polymethylsilane silsesquioxane cross-linked polymer, toner, pearlescent and other components in mixing equipment; s2, compression molding: putting a silica gel sleeve into a metal jig, pouring the pasty material body into a silica gel film, and performing compression dewatering molding through pressure equipment; s3, freezing treatment: putting the formed material body into freezing equipment at the temperature of 40 DEG C below zero to 50 DEG C below zero to be frozen for 30 minutes; s4, demolding and placing: demolding after freezing is completed, and placing for 60 minutes after demolding; and S5, baking and drying: baking in an oven at 60 DEG C for 12 hours to evaporate 95% of water. Compared with the prior art, the method has the advantages that the baked powder prepared by the method is fine and smooth in surface and excellent in texture, and meanwhile, the product has relatively good drop resistance, and is not damaged after vertically dropping from 30cm to a marble slab for two times according to a test.

Description

Technical Field

[0001] The invention relates to the technical field of cosmetic preparation, in particular to a method for preparing freeze-dried baked powder of cosmetics. Background Art

[0002] Currently, the existing freeze-dried powder production process for cosmetics suffers from numerous drawbacks. For one thing, the surface of the powder produced by traditional pressing methods is not smooth, affecting the product's texture and user experience. Furthermore, the current freeze-drying process involves pouring the product into a silicone mold, placing it in a freeze-drying machine, and then freezing it for 20 hours before removing it. This process relies on bulky freeze-drying equipment, and the silicone molds can only be used 30-50 times, resulting in high costs and insufficient production capacity for micro-sized enterprises. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the above technical defects and provide a method for preparing freeze-dried baked powder for cosmetics.

[0004] In order to solve the above problems, the technical solution of the present invention is: a method for preparing freeze-dried baked powder for cosmetics, characterized in that it comprises the following steps: S1 raw material mixing: mica, vinyl polydimethylsiloxane / polymethylsilane silsesquioxane crosslinked polymer, color powder, pearlescent material and other ingredients are placed in a mixing device and mixed evenly;

[0005] S2 Compression Molding: Place the silicone sleeve into a metal fixture, pour the paste into the silicone membrane, and press and dehydrate it through a pressure device to form the mold.

[0006] S3 Freezing Treatment: Place the formed material into a freezing device at -40 to -50°C and freeze for 30 minutes

[0007] S4 demoulding and placing: demoulding after freezing is completed, and placing for 60 minutes after demoulding

[0008] S5 baking and drying: bake in an oven at 60'℃ for 12 hours to evaporate 95% of the moisture.

[0009] Furthermore, the mixing equipment uses a double planetary mixer to mix the raw materials, and the stirring blade speed is controlled at 150-200 rpm to ensure that the solid powder components such as mica, vinyl polydimethylsiloxane / polymethylsiloxane silsesquioxane cross-linked polymer, color powder, pearlescent material are uniformly dispersed within 30 minutes.

[0010] Furthermore, the metal tool is made of 304 stainless steel, the inner wall is plated with PTFE anti-stick coating, the silicone sleeve is embedded in the fixture groove, and a sealing ring is set on the edge of the fixture to ensure that the material does not overflow during the pressing process.

[0011] Furthermore, the pressing equipment uses a four-column hydraulic tablet press, and the pressing pressure is controlled in stages. In the pre-pressing stage, a pressure of 0.5-1 MPa is maintained for 5 minutes to expel air from the gaps between large particles inside the material body. In the main pressing stage: the pressure is gradually increased to 3-5 MPa and maintained for 10 minutes to reduce the moisture content of the material body to 20%-25%, and at the same time, it is monitored in real time by an infrared moisture meter.

[0012] Furthermore, the freezing equipment uses a medical-grade low-temperature freezer with a temperature control accuracy of ±1°C. During the freezing process, the freezer wind speed is maintained at 1.5m / s to ensure that the internal temperature of the material body is evenly reduced to -45°C±2°C.

[0013] Furthermore, after the freezing is completed, the demoulding device needs to place the fixture at room temperature of 25℃±2℃ for 5 minutes, and then slowly eject the material body with a thrust of 0.3MPa through the pneumatic demoulding device to avoid powder breakage due to temperature difference stress.

[0014] Furthermore, the oven adopts a hot air circulation oven, and a multi-layer grid is arranged inside the oven, and the material bodies are placed at a spacing of not less than 2 cm to ensure the circulation of hot air.

[0015] The advantages of the present invention compared with the existing technology are:

[0016] (1) The baking powder prepared by this method has a fine and smooth surface and excellent texture. At the same time, the product has good drop resistance. After testing, it was dropped vertically from 30CM to a marble slab twice without any damage.

[0017] (2) The equipment used in this preparation method is small and suitable for micro-sized enterprises. Moreover, the service life of the silicone sleeve is significantly improved, 2.66 times longer than that of the traditional freeze-drying process, and the silicone turnover rate is fast, effectively reducing production costs. In addition, this process is simpler and has lower energy consumption than the freeze-dried powder baking process on the market, which is conducive to increasing production. DETAILED DESCRIPTION

[0018] The specific embodiments of the present invention are further described below with reference to the embodiments, wherein the same components are represented by the same embodiment numbers.

[0019] It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to directions in the embodiment, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0020] In order to make the contents of the present invention more clearly understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments in the embodiments of the present invention.

[0021] Example

[0022] A method for preparing freeze-dried baked powder for cosmetics, characterized by comprising the following steps: S1: mixing raw materials: placing mica, vinyl polydimethylsiloxane / polymethylsilane silsesquioxane cross-linked polymer, color powder, pearlescent material and other ingredients into a mixing device and mixing them uniformly;

[0023] The mixing equipment uses a double planetary mixer to mix the raw materials. The stirring blade speed is controlled at 150-200rpm to ensure that the solid powder components such as mica, vinyl polydimethylsiloxane / polymethylsiloxane silsesquioxane cross-linked polymer, color powder, pearlescent material, etc. are uniformly dispersed within 30 minutes.

[0024] S2 pressing and molding: Pour oil into the mixed raw materials, continue stirring until completely mixed, then add a certain proportion of water, stir into a uniform paste, put the silicone sleeve into the metal fixture, pour the paste into the silicone membrane, and press and dehydrate it through the pressure equipment to form it;

[0025] The metal tool is made of 304 stainless steel, with a PTFE anti-stick coating on the inner wall. The silicone sleeve is embedded in the groove of the fixture, and a sealing ring is set on the edge of the fixture to ensure that the material does not overflow during the pressing process. The pressing equipment uses a four-column hydraulic tablet press. The pressing pressure is controlled in stages. In the pre-pressing stage, a pressure of 0.5-1MPa is maintained for 5 minutes to expel the air between large particles inside the material. In the main pressing stage: the pressure is gradually increased to 3-5MPa and maintained for 10 minutes to reduce the moisture content of the material to 20%-25%. At the same time, an infrared moisture meter is used for real-time monitoring.

[0026] S3 Freezing Treatment: Place the formed material into a freezing device at -40 to -50°C and freeze for 30 minutes;

[0027] The freezing equipment uses a medical-grade low-temperature freezer with a temperature control accuracy of ±1°C. During the freezing process, the freezer wind speed is maintained at 1.5m / s to ensure that the internal temperature of the material is evenly reduced to -45°C±2°C.

[0028] S4 demoulding and placing: demoulding after freezing is completed, and placing for 60 minutes after demoulding;

[0029] After the demoulding device is frozen, the fixture needs to be placed at room temperature of 25℃±2℃ for 5 minutes, and then the pneumatic demoulding device is used to slowly eject the material with a thrust of 0.3MPa to avoid powder breakage due to temperature difference stress;

[0030] S5 baking and drying: bake in a 60'℃ oven for 12 hours to evaporate 95% of the water;

[0031] The oven adopts a hot air circulation oven. A multi-layer grid is set inside the oven. The spacing between the materials is not less than 2cm to ensure the circulation of hot air.

[0032] The present invention and its embodiments are described above. Such description is not restrictive. The embodiment shown in the embodiment is only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the invention, without creatively designing a structure and embodiment similar to the technical solution, they shall fall within the scope of protection of the present invention.

Claims

1. A method for preparing freeze-dried baked powder for cosmetics, characterized by: The method comprises the following steps S1: mixing raw materials: placing mica, vinyl polydimethylsiloxane / polymethylsilane silsesquioxane cross-linked polymer, color powder, pearlescent material and other ingredients into a mixing device and mixing them evenly; S2 Compression Molding: Place the silicone sleeve into a metal fixture, pour the paste into the silicone membrane, and press and dehydrate it using a pressure device to form the mold; S3 Freezing Treatment: Place the formed material into a freezing device at -40 to -50°C and freeze for 30 minutes; S4 demoulding and placing: demoulding after freezing is completed, and placing for 60 minutes after demoulding; S5 baking and drying: bake in an oven at 60'℃ for 12 hours to evaporate 95% of the moisture.

2. The method for preparing freeze-dried baked powder for cosmetics according to claim 1, wherein: The mixing equipment uses a double planetary mixer to mix the raw materials, and the stirring blade speed is controlled at 150-200 rpm to ensure that the solid powder components such as mica, vinyl polydimethylsiloxane / polymethylsiloxane silsesquioxane cross-linked polymer, color powder, pearlescent material, etc. are uniformly dispersed within 30 minutes.

3. The method for preparing freeze-dried baked powder for cosmetics according to claim 1, characterized in that: The metal tool is made of 304 stainless steel, the inner wall is plated with PTFE anti-stick coating, the silicone sleeve is embedded in the groove of the fixture, and a sealing ring is set on the edge of the fixture to ensure that the material does not overflow during the pressing process.

4. The method for preparing freeze-dried baked powder for cosmetics according to claim 1, wherein: The pressing equipment uses a four-column hydraulic tablet press, and the pressing pressure is controlled in stages. In the pre-pressing stage, a pressure of 0.5-1 MPa is maintained for 5 minutes to expel air between large particles inside the material body. In the main pressing stage, the pressure is gradually increased to 3-5 MPa and maintained for 10 minutes to reduce the moisture content of the material body to 20%-25%. At the same time, it is monitored in real time by an infrared moisture meter.

5. The method for preparing freeze-dried baked powder for cosmetics according to claim 1, characterized in that: The freezing equipment uses a medical-grade low-temperature freezer with a temperature control accuracy of ±1°C. During the freezing process, the freezer wind speed is maintained at 1.5m / s to ensure that the internal temperature of the material is evenly reduced to -45°C±2°C.

6. The method for preparing freeze-dried baked powder for cosmetics according to claim 1, characterized in that: After the freezing is completed, the demoulding device needs to place the fixture at room temperature of 25℃±2℃ for 5 minutes, and then slowly eject the material body with a thrust of 0.3MPa through the pneumatic demoulding device to avoid powder breakage due to temperature difference stress.

7. The method for preparing freeze-dried baked powder for cosmetics according to claim 1, characterized in that: The oven adopts a hot air circulation oven, and a multi-layer grid is set inside the oven. The material is placed at a distance of not less than 2cm to ensure the circulation of hot air.