Cosmetic powder modification device and method

Abstract

The invention belongs to the technical field of daily chemical equipment, and provides a cosmetic powder modification device and method. The cosmetic powder modification device comprises a powder raw material feed port, a solid flow controller, a transmission device, a metal rotating shaft, a grounding lead, a powder dispersion reaction area, a discharge hopper and a finished powder collection area. The powder dispersion reaction area comprises an adjustable high-frequency alternating-current power supply, a gas storage bottle, a volume flow controller and a plasma reaction core. The plasma reaction core comprises a high-voltage electrode, a smooth quartz plate and a rough quartz plate with different surface roughness degrees, a metal disc capable of being mounted on a metal rotating shaft, and a device shell. According to the device, the plasma surface modification technology and the disc centrifugal dispersion technology are creatively integrated, and an online powder processing system is formed. And while modification of the organic matter on the surface of the inorganic matter is completed, dispersion of the powder agglomeration part is realized. The synergistic interaction of'surface functionalization-dynamic deagglomeration 'is achieved.

Description

Technical Field

[0001] This invention relates to the field of cosmetic equipment and technology, and in particular to a cosmetic powder modification device and method. Background Technology

[0002] In modern cosmetics manufacturing, the synergistic application of inorganic functional raw materials (such as titanium dioxide and zinc oxide nanoparticles) and organic matrices (such as emulsions and liposomes) is becoming increasingly widespread, aiming to achieve multiple effects such as sun protection, whitening, and anti-oxidation. However, the aggregation of raw materials has become a core challenge restricting product stability and safety. When inorganic particles aggregate due to mismatched surface properties (such as differences in hydrophilicity and hydrophobicity) or disturbances in the organic carrier environment (such as pH fluctuations and temperature changes), the system may rapidly become unstable, manifesting as a rough texture, decreased fluidity, or even stratification and clumping.

[0003] This issue directly impacts the sensory experience and functional effectiveness of end products. For example, the micron-sized particles formed by the aggregation of nano-sized silica can significantly hinder the uniform dispersion of active ingredients, leading to pilling when applying sunscreen; excessive aggregation of zinc oxide particles may disrupt the emulsion structure, causing serums to separate during storage. More concerning is that the formation of aggregates may exacerbate the risk of raw materials penetrating the skin—when nanoparticles breach the skin barrier through aggregate structures, their migration rate can be several times higher than in a monodisperse state, posing potential safety hazards.

[0004] In recent years, industry data shows that product quality issues caused by raw material agglomeration account for more than 12% annually, with over $300 million worth of sunscreen products being recalled globally in 2022 alone due to insufficient stability. Although existing technologies have partially mitigated this problem by adding surfactants or adjusting process parameters, significant challenges remain in balancing cost control and performance in large-scale production. Therefore, a deep understanding of agglomeration mechanisms and the establishment of universally applicable control strategies are crucial for improving the technological level and market competitiveness of the cosmetics industry.

[0005] Currently, in cosmetic production, the main methods for addressing the agglomeration of inorganic and organic raw materials include optimizing physical dispersion processes, surface modification, and adding stabilizers. In physical dispersion processes, high-shear dispersers generate strong shear forces through high-speed rotating stators and rotors to achieve dispersion; while ultrasonic dispersion utilizes cavitation to break down agglomerates, thereby reducing particle size and ultimately obtaining a more homogeneous system. However, dispersing high-viscosity systems through mechanical action is inefficient and requires a long dispersion time, failing to meet the demands of high-efficiency production. Furthermore, while surface modification technologies (such as silane coupling agent treatment of silica) can improve raw material compatibility, they suffer from increased costs (30%–50% higher raw material costs), high processing barriers, and limitations such as residual modifying agents and easy detachment of the modified layer. In summary, existing methods still face challenges in terms of process stability (e.g., pH sensitivity), large-scale application (e.g., high equipment investment barriers), and safety (e.g., chemical residue risks), necessitating the development of more economical and universally applicable solutions.

[0006] Plasma is the fourth state of matter, containing a large number of reactive particles such as electrons, ions, atoms, and free radicals, and has very high energy density and reactivity. It contains reactive oxygen species (such as...). ) and reactive nitrogen (such as This process involves bombarding the material surface with substances such as charged particles, ultraviolet radiation, and electric fields. High-energy particles introduce active functional groups such as hydroxyl and carboxyl groups onto the surface, achieving a grafting reaction to form a stable organic polymer layer. Simultaneously, this increases the roughness of the powder particles, endowing them with antibacterial properties and enhancing the affinity between cosmetic powders and skin. This modified layer not only reduces the surface energy of inorganic materials but also weakens the van der Waals forces between particles through steric hindrance, increasing the depolymerization rate of cosmetic powder aggregates by over 30%, improving powder flowability and dispersion within the cosmetic matrix, and ultimately enhancing production efficiency.

[0007] Using plasma to treat cosmetic powders can remove contaminants from the powders through chemical reactions and thermal effects, reduce additional reactions during production, and improve the stability of cosmetic powders. Summary of the Invention

[0008] This invention provides a cosmetic powder modification device. The disc reactor in the device exhibits significant comprehensive advantages in the centrifugal dispersion of agglomerates: it efficiently breaks down agglomerates through multi-directional shear force and dynamic turbulent flow field, while the self-cleaning function of the disc removes adhering materials from the cylinder wall in real time, avoiding the formation of dead zones; the unique axial push design effectively improves the conveying efficiency of high-viscosity fluids, and combined with variable-pitch gradient shear, it achieves low-energy dispersion (energy consumption is reduced by more than 30% compared with traditional equipment); ultimately, it achieves a balance between dispersion uniformity, process stability and economy, becoming the preferred solution for the large-scale production of high-viscosity systems.

[0009] The technical solution adopted in this invention is as follows:

[0010] The cosmetic powder modification device includes a powder raw material inlet 1-1, a solid flow controller 1-2, a transmission device, a metal rotating shaft, a grounding lead 4, a powder dispersion reaction zone 5, a discharge hopper 6, and a finished powder collection zone 7.

[0011] The powder dispersion reaction zone 5 includes an adjustable high-frequency AC power supply, a gas storage cylinder, a volume flow controller, and a plasma reaction core 11.

[0012] The plasma reaction core 11 includes a high-voltage electrode 11-1, a smooth quartz plate 11-2 and a rough quartz plate 11-3 with different surface roughness, a metal disk 11-4 that can be installed on a metal rotating shaft, and a device housing 11-5.

[0013] The top of the plasma reaction core 11 is a cover structure consisting of a high-voltage electrode 11-1 and a smooth quartz plate 11-2, with the smooth quartz plate 11-2 tightly attached to the lower surface of the high-voltage electrode 11-1. This cover structure covers the top of the device housing 11-5. Parallel to the smooth quartz plate 11-2 are a rough quartz plate 11-3 and a metal disk 11-4, with a gap between them. The rough quartz plate 11-3 is fixedly attached to the upper surface of the metal disk 11-4, and both are suspended inside the device housing 11-5, not contacting the inner wall of the housing. The rough quartz plate 11-3 and the metal disk 11-4 are fixed together on a metal rotating shaft and can rotate with it. The bottom of the device housing 11-5 communicates with the discharge hopper 6. The discharge hopper 6 is connected to the finished powder collection area 7.

[0014] The outer end of the metal rotating shaft is connected to a transmission device, which provides the power for the metal rotating shaft to rotate. The outer end of the metal rotating shaft is also connected to a grounding lead 4.

[0015] The high-voltage electrode 11-1 is connected to a high-frequency AC power supply. The gas storage cylinder is connected to the inside of the plasma reaction core 11, and the volumetric flow controller is located between the two. The gas guide pipe led out from the gas storage cylinder is connected to the outer shell 11-5 of the plasma reaction core 11 and located below the metal disk 11-4. The gas flow rate is controlled by the volumetric flow controller.

[0016] The cover structure has an opening that connects to the powder raw material inlet 1-1, and the flow rate of the powder raw material is controlled by the solid flow controller 1-2 between the two.

[0017] Furthermore, there is one or more plasma reaction cores 11, and each plasma reaction core 11 is connected in series from top to bottom.

[0018] Furthermore, there are two transmission devices and two metal rotating shafts, namely transmission device A2-1, transmission device B2-2, metal rotating shaft A3-1, and metal rotating shaft B3-2. Transmission device A2-1 is connected to metal rotating shaft A3-1, and transmission device B2-2 is connected to metal rotating shaft B3-2. Metal rotating shaft A3-1 is fixed to the rough quartz plate 11-3 and metal disk 11-4 in the upper part of the plasma reaction core 11, and metal rotating shaft B3-2 is fixed to the rough quartz plate 11-3 and metal disk 11-4 in the lower part of the plasma reaction core 11.

[0019] Furthermore, the working medium inside the plasma reaction core 11 is air, and the plasma working gas is discharged downward along with the powder dispersed by the reaction.

[0020] Furthermore, the outer casing 11-5 of the device is made of insulating materials, such as ceramics or quartz.

[0021] The steps for modifying cosmetic powders are as follows:

[0022] (1) Turn on the volumetric flow controller and introduce gas into the device. After the plasma working gas fills the reaction device, adjust the gas flow rate to the required flow rate for the reaction process and continue to introduce gas into the device steadily.

[0023] (2) Turn on and adjust the high-frequency AC power supply to the working voltage so that the air region between the metal disk 11-4 and the high-voltage electrode 11-1 is filled with stable plasma.

[0024] (3) Open the transmission device so that the metal rotating shaft drives the metal disc to reach the working speed.

[0025] (4) Pour the raw material into the powder raw material inlet 1-1, set the solid flow controller 1-2, so that the powder enters the powder dispersion reaction zone 5 stably, and finally completes the reaction and dispersion.

[0026] (5) The finished product that has been reacted and dispersed is collected in the finished product powder collection area 7 through the discharge hopper 6.

[0027] (6) After the preparation is completed, turn off the transmission device and the high-frequency AC power supply in sequence, control the volume flow controller to make the gas flow rate 0 and close the valve of the gas storage bottle. Disassemble, inspect and clean the plasma reaction core 11 for future use.

[0028] The beneficial effects of this invention are as follows:

[0029] This device innovatively integrates plasma surface modification and disc centrifugal dispersion technologies to form an online powder processing system, achieving a synergistic effect of "surface functionalization - dynamic deagglomeration". The plasma discharge module (power density 3-5 W / cm²) uses dielectric barrier discharge (DBD) on inorganic powders (such as... The process involves in-situ generation of hydroxyl radicals and other reaction sites on the surface, along with etching out nanoscale pores. This allows organic matter to graft onto the reaction sites on the inorganic particle surface, ultimately forming an organic polymer layer of controllable thickness, thus reducing the surface energy of the powder. Simultaneously, a disc centrifugal dispersion device uses multi-stage gradient shearing to forcibly disperse agglomerated regions in the modified powder, simultaneously breaking down and uniformly dispersing agglomerates during vertical axial transport. This synergistic process saves 35% of energy and reduces raw material agglomeration rate by 78% compared to traditional stepwise processing methods, while avoiding secondary pollution caused by powder transfer. It is suitable for the continuous production of high-value-added products such as cosmetic foundations and sunscreens, providing functional raw materials with both dispersion stability and interfacial compatibility for daily chemical products.

[0030] The only raw materials for this device, besides the organic and inorganic powder materials requiring modification, are air. It boasts advantages such as low reaction cost, short processing time, convenient operation, and low scrap rate, making this invention an excellent solution to related problems. Attached Figure Description

[0031] Figure 1 This constitutes the overall composition of the present invention.

[0032] Figure 2 This is the internal structure of the powder dispersion reaction zone of the present invention.

[0033] Figure 3 This is the internal structure of the plasma reaction core of the present invention.

[0034] Figure 4 This is a comparison chart of thermogravimetric analysis of the powder before and after modification.

[0035] Figure 5 This is a comparison diagram showing the state of the powder dispersed in organic solvents before and after modification.

[0036] Figure 6 The images show the SEM and TEM images of the powder before modification.

[0037] Figure 7 These are SEM and TEM images of the modified powder.

[0038] Figure 8 The contact angle between the unmodified powder and water is denoted as .

[0039] Figure 9 The contact angle between the modified powder and water is denoted as .

[0040] Figure 10The contact angle between the unmodified powder and the oil is shown.

[0041] Figure 11 The contact angle between the modified powder and the oil is denoted as .

[0042] Figure 12 Dissolution of the powder before modification and microscopic observation of the dispersion.

[0043] Figure 13 Dissolution of the modified powder and microscopic observation of the dispersion.

[0044] The components are as follows: 1-1 Powder raw material inlet; 1-2 Solid flow controller; 2-1 Transmission device A, 2-2 Transmission device B; 3-1 Metal rotating shaft A, 3-2 Metal rotating shaft B; 4 Grounding lead; 5 Powder dispersion reaction zone; 6 Discharge hopper; 7 Finished powder collection zone; 8-1 High-frequency AC power supply A, 8-2 High-frequency AC power supply B; 9-1 Gas storage cylinder A, 9-2 Gas storage cylinder B; 10-1 Volumetric flow controller A, 10-2 Volumetric flow controller B; 11- Plasma reaction core; 11-1 High-voltage electrode; 11-2 Smooth quartz plate; 11-3 Rough quartz plate; 11-4 Metal disk; 11-5 Device shell. Detailed Implementation

[0045] To demonstrate that the sterilization water preparation system provided by this invention has a significant sterilization effect, the following embodiments are provided for demonstration.

[0046] The following examples further illustrate the method and effects of the present invention, but do not limit the scope of protection of the present invention.

[0047] The cosmetic powder modification device includes a powder raw material inlet 1-1, a solid flow controller 1-2, a transmission device, a metal rotating shaft, a grounding lead 4, a powder dispersion reaction zone 5, a discharge hopper 6, and a finished powder collection zone 7.

[0048] The powder dispersion reaction zone 5 includes an adjustable high-frequency AC power supply, a gas storage cylinder, a volume flow controller, and a plasma reaction core 11.

[0049] The plasma reaction core 11 includes a high-voltage electrode 11-1, a smooth quartz plate 11-2 and a rough quartz plate 11-3 with different surface roughness, a metal disk 11-4 that can be installed on the rotating shaft, and a device housing 11-5.

[0050] The top of the plasma reaction core 11 is a cover structure consisting of a high-voltage electrode 11-1 and a smooth quartz plate 11-2, with the smooth quartz plate 11-2 tightly attached to the lower surface of the high-voltage electrode 11-1. This cover structure covers the top of the device housing 11-5. Parallel to the smooth quartz plate 11-2 are a rough quartz plate 11-3 and a metal disk 11-4, with a gap between them. The rough quartz plate 11-3 is fixedly attached to the upper surface of the metal disk 11-4, suspended inside the device housing 11-5, and does not contact the inner wall of the device housing 11-5. The rough quartz plate 11-3 and the metal disk 11-4 are fixed together on a metal rotating shaft and can rotate with it. The bottom of the device housing 11-5 communicates with the discharge hopper 6. The discharge hopper 6 is connected to the finished powder collection area 7.

[0051] The outer end of the metal rotating shaft is connected to a transmission device, which provides the power for the metal rotating shaft to rotate. The outer end of the metal rotating shaft is also connected to a grounding lead 4.

[0052] The high-voltage electrode 11-1 is connected to a high-frequency AC power supply, thereby regulating the voltage of the high-voltage electrode 11-1. The gas storage cylinder is connected to the inside of the plasma reaction core 11, and a volumetric flow controller is located between the two; gas is introduced into the area below the metal disk 11-4.

[0053] The cover structure has an opening that connects to the powder raw material inlet 1-1, and the flow rate of the powder raw material is controlled by the solid flow controller 1-2 between the two.

[0054] Furthermore, there is one or more plasma reaction cores 11, and each plasma reaction core 11 is connected in series from top to bottom.

[0055] Furthermore, there are two transmission devices and two metal rotating shafts, namely transmission device A2-1, transmission device B2-2, metal rotating shaft A3-1, and metal rotating shaft B3-2. Transmission device A2-1 is connected to metal rotating shaft A3-1, and transmission device B2-2 is connected to metal rotating shaft B3-2. Metal rotating shaft A3-1 is fixed to the rough quartz plate 11-3 and metal disk 11-4 in the upper part of the plasma reaction core 11, and metal rotating shaft B3-2 is fixed to the rough quartz plate 11-3 and metal disk 11-4 in the lower part of the plasma reaction core 11.

[0056] Furthermore, the working medium inside the plasma reaction core 11 is air, and the plasma working gas is discharged downward along with the powder dispersed by the reaction.

[0057] Furthermore, the outer casing 11-5 of the device is made of ceramic.

[0058] In this embodiment, the powder dispersion reaction zone 5 includes five plasma reaction cores 11, two transmission devices and two metal rotating shafts (transmission device A2-1, transmission device B2-2, metal rotating shaft A3-1, and metal rotating shaft B3-2), two high-frequency AC power supplies, two gas storage cylinders, and two volumetric flow controllers (high-frequency AC power supply A8-1, high-frequency AC power supply B8-2, gas storage cylinder A9-1, gas storage cylinder B9-2, volumetric flow controller A10-1, and volumetric flow controller B10-2). Transmission device A2-1 is connected to metal rotating shaft A3-1, and transmission device B2-2 is connected to metal rotating shaft B3-2. Metal rotating shaft A3-1 is fixed to the rough quartz plate 11-3 and metal disk 11-4 in the two upper plasma reaction cores 11, and metal rotating shaft B3-2 is fixed to the rough quartz plate 11-3 and metal disk 11-4 in the three lower plasma reaction cores 11. The rotational speed of the metal rotating shaft is adjusted via a transmission device. High-frequency AC power supplies A8-1 and B8-2, and gas cylinder A9-1 are connected to the two plasma reaction cores 11 in the upper part, respectively. Gas cylinder B9-2, volumetric flow controller A10-1, and volumetric flow controller B10-2 are connected to the three plasma reaction cores 11 in the lower part. Wires from the high-frequency AC power supplies are connected to the high-voltage electrode 11-1 of the plasma reaction core 11; gas guide pipes from the gas cylinders are connected to the lower part of the device casing 11-5 and the metal disk 11-4 of the plasma reaction core 11, and the gas flow rate is controlled by the volumetric flow controllers. The circular notch at the center of the smooth quartz plate 11-2 is the feed inlet of the plasma reaction core 11 and is connected to the solid flow controller or the discharge port of the previous plasma reaction core 11. The wide opening of the device shell 11-5 is connected to the smooth quartz plate 11-2, making the reaction a semi-closed device with open top and bottom. Its narrow opening is the discharge port of the plasma reaction core 11 and is connected to the next plasma reaction core 11 or the discharge hopper.

[0059] The specific structure and working principle of this invention are as follows:

[0060] Metal rotating shafts A3-1 and B3-2 are driven by transmission devices A2-1 and B2-2, which in turn drive metal disc 11-4 and rough quartz plate 11-3 to rotate.

[0061] Untreated powder raw materials are stably introduced into the plasma reaction core under the control of solid flow controller 1-2. When the powder comes into contact with the surface of the rough quartz plate 11-3, it is subjected to multi-directional shear force and moves from the center of the disk to the edge of the disk under centrifugal force, finally falling into the discharge port below. During this process, the powder undergoes surface modification simultaneously with the inorganic and organic components while passing through the plasma-covered area. Different degrees of dispersion effects can be achieved by adjusting the disk rotation speed by adjusting transmission devices A2-1 and B2-2; the degree of grafting of the powder can be further affected by adjusting the voltage between the high-voltage electrode 11-1 and the metal disk 11-4 by adjusting the high-frequency AC power supply A8-1 and B8-2, thus achieving different modification effects.

[0062] Under the influence of gravity and airflow, the powder gradually enters the next-stage plasma reaction core 11. Finally, it flows out of the discharge hopper 6 and enters the finished powder collection area.

[0063] The specific steps for modifying cosmetic powders using the above-mentioned apparatus are as follows:

[0064] S1: Turn on volumetric flow controller A10-1 and volumetric flow controller B10-2, adjust to the required gas flow rate, and wait for 1 minute to allow the gas to fill the reaction device.

[0065] S2: Turn on and adjust the high-frequency AC power supply A8-1 and high-frequency AC power supply B8-2 to the working voltage, so that the area between the metal disk 11-4 and the high-voltage electrode 11-1 is filled with stable plasma.

[0066] S3: Open transmission device A2-1 and transmission device B2-2 to make the disc reach the working speed.

[0067] S4: Pour the raw material into the powder feed inlet 1-1, set the solid flow controller 1-2, so that the powder enters the powder dispersion reaction zone 5 stably and finally completes the reaction and dispersion.

[0068] S5: Collect the finished product that has been reacted and dispersed in the finished product powder collection area 7.

[0069] S6: After the preparation is completed, turn off the transmission device A2-1, transmission device B2-2, high-frequency AC power supply A8-1, high-frequency AC power supply B8-2 in sequence, and control the volumetric flow controller A10-1 and volumetric flow controller B10-2 to make the gas flow rate 0 and close the gas storage bottle valve.

[0070] S7: Disassemble, inspect, and clean the plasma reaction core 11 for future use.

[0071] Solid flow controller 1-2 controls the powder flow rate to 28g / s.

[0072] In this embodiment, the high-frequency AC power supply A8-1 controls the voltage at 10kV, and the high-frequency AC power supply B8-2 controls the voltage at 20kV.

[0073] Volumetric flow controller A10-1 controls the gas flow rate at 1.8 L / min, and volumetric flow controller B10-1 controls the gas flow rate at 2.4 L / min.

[0074] The powder dispersion reaction zone is divided into two stages. Different dispersion effects can be achieved by adjusting the rotation speed of transmission device A2-1 and transmission device B2-2. The high-voltage electrode is connected to a high-frequency AC power supply, thereby adjusting the voltage of the electrode to achieve different degrees of grafting.

[0075] Transmission device A2-1 controls the metal rotating shaft at 1000 rad / min, and transmission device B2-2 controls the metal rotating shaft at 3000 rad / min. Using high-voltage electrode A11-1, smooth quartz plate 11-2, rough quartz plate 11-3, and grounded metal disk 11-4, dielectric barrier discharge is achieved, generating plasma between the quartz plates and creating reaction conditions for the grafting of organic matter onto the inorganic surface. The device can simultaneously disperse and modify cosmetic powder materials. Solid flow controller A1-2 controls the powder feed rate at 28 g / s.

[0076] by Silane is an inorganic raw material, while silane is an organic raw material. Silane is grafted onto... Surface modification of materials is achieved to create sunscreens with superior properties.

[0077] Powders have poor oleophilicity and tend to agglomerate in organic systems, making them difficult to disperse evenly. Silane modification can improve the dispersibility of sunscreen powders in organic systems. Furthermore, silane modification is very stable, has stronger compatibility in organic systems, and results in a finer emulsion that reduces whitening.

[0078] The material was modified through the above steps. Thermogravimetric analysis was then used to characterize the sunscreen agent before and after modification. Figure 4 As shown.

[0079] Thermogravimetric analysis showed that the mass of the modified material began to decrease rapidly at around 300℃. This indicates that the organic raw material silane was successfully grafted onto the material surface and constituted a significant percentage of the material's mass. Figure 5 As shown.

[0080] The powders before and after modification were dispersed using organic solvents. The results showed that the powder before modification exhibited stratification after a period of time, while the modified powder remained stable and was uniformly dispersed in the solvent.

[0081] The morphology of the materials before and after modification was observed using SEM and TEM.

[0082] Before modification, the powder exhibited significant agglomeration, with overlapping titanium dioxide particles that were difficult to disperse. Figure 6 As shown.

[0083] Modified titanium dioxide is more uniformly dispersed, with reduced agglomeration and easier dispersion, such as... Figure 7 As shown.

[0084] Poor formula compatibility or solvent evaporation from the foundation surface can disrupt the emulsion system, causing pigment aggregation and color changes. Therefore, materials need to have certain hydrophobic, sweat-resistant, and sebum-resistant properties to improve the dullness of foundation makeup.

[0085] The water contact angles of the two powders were analyzed. The water contact angle of the unmodified titanium dioxide was 37°, while that of the modified titanium dioxide was 144.6°, indicating a significant enhancement in hydrophobicity. Figure 8 , Figure 9 As shown.

[0086] Analysis of the water contact angles of the two powders revealed that the unmodified oil could completely wet the powder, while the modified oil had a contact angle of 132°. This demonstrates that the modified powder exhibits better resistance to oily substances such as sebum. Figure 10 , Figure 11 As shown.

[0087] The Marangoni effect refers to the mass transfer phenomenon at the fluid interface caused by the surface tension gradient. For example... Figure 12 , Figure 13 As shown, uneven distribution of sunscreen agents during product use reduces sun protection effectiveness. To suppress the Marangoni effect, tests revealed that the modified powder significantly inhibited the Marangoni effect. Furthermore, observation of the dispersion using a super depth-of-field microscope showed that the unmodified powder particles aggregated at the droplet edges, macroscopically exhibiting the Marangoni effect; while the modified powder was uniformly dispersed in the solution, with no significant difference in particle concentration between the edges and the center under the super depth-of-field microscope, macroscopically demonstrating uniform dispersion. From both macroscopic and microscopic perspectives, characterization demonstrates that the powder modified by this invention possesses better dispersibility.

[0088] In summary, the invented disc reactor exhibits excellent performance in terms of powder dispersion, reaction completion, and modification of powder cosmetics. It directly imparts hydrophobic, oleophobic, and easily dispersible properties to powders through the reaction. Furthermore, the device boasts low reaction cost, high reaction efficiency, and convenient maintenance, making it suitable for large-scale continuous production scenarios.

Claims

1. A cosmetic powder modification device, characterized in that, It includes a powder raw material inlet (1-1), a solid flow controller (1-2), a transmission device, a metal rotating shaft, a grounding lead (4), a powder dispersion reaction zone (5), a discharge hopper (6), and a finished powder collection zone (7). The powder dispersion reaction zone (5) includes an adjustable high-frequency AC power supply, a gas storage bottle, a volume flow controller, and a plasma reaction core (11). The plasma reaction core (11) includes a high-voltage electrode (11-1), a smooth quartz plate (11-2) and a rough quartz plate (11-3) with different surface roughness, a metal disk (11-4) that can be installed on a metal rotating shaft, and a device housing (11-5). The top of the plasma reaction core (11) is a cover structure consisting of a high-voltage electrode (11-1) and a smooth quartz plate (11-2), with the smooth quartz plate (11-2) closely attached to the lower surface of the high-voltage electrode (11-1). The cover structure covers the top of the device shell (11-5). A rough quartz plate (11-3) and a metal disk (11-4) are arranged parallel to the smooth quartz plate (11-2), with a gap between the smooth quartz plate (11-2) and the rough quartz plate (11-3). With gaps, the rough quartz plate (11-3) is fixedly attached to the upper surface of the metal disc (11-4), and the two are suspended inside the device shell (11-5) without contacting the inner wall of the device shell (11-5). The rough quartz plate (11-3) and the metal disc (11-4) are fixed together on the metal rotating shaft and can rotate with the metal rotating shaft. The bottom end of the device shell (11-5) is connected to the discharge hopper (6). The discharge hopper (6) is connected to the finished powder collection area (7). The outer end of the metal rotating shaft is connected to a transmission device, which provides rotational power to the metal rotating shaft; the outer end of the metal rotating shaft is also connected to a grounding lead (4). The high-voltage electrode (11-1) is connected to a high-frequency AC power supply; the gas storage cylinder is connected to the inside of the plasma reaction core (11), and the volume flow controller is set between the two; the gas pipe led out from the gas storage cylinder is connected to the outer shell (11-5) of the plasma reaction core 11 and located at the lower part of the metal disk (11-4), and the gas flow rate is controlled by the volume flow controller respectively. The cover structure has an opening that connects to the powder raw material inlet (1-1), and the flow rate of the powder raw material is controlled by a solid flow controller (1-2) between the two.

2. The cosmetic powder modification device according to claim 1, characterized in that, There is one or more plasma reaction cores (11), and each plasma reaction core (11) is connected in series from top to bottom.

3. The cosmetic powder modification apparatus according to claim 1, characterized in that, The transmission device and the metal rotating shaft are two each, namely transmission device A (2-1), transmission device B (2-2), metal rotating shaft A (3-1), and metal rotating shaft B (3-2); transmission device A (2-1) is connected to metal rotating shaft A (3-1), and transmission device B (2-2) is connected to metal rotating shaft B (3-2); metal rotating shaft A (3-1) is fixed to the rough quartz plate (11-3) and metal disk (11-4) in the upper plasma reaction core (11), and metal rotating shaft B (3-2) is fixed to the rough quartz plate (11-3) and metal disk (11-4) in the lower plasma reaction core (11).

4. The cosmetic powder modification device according to claim 1, characterized in that, The working medium inside the plasma reaction core (11) is air, and the plasma working gas is discharged downward along with the powder dispersed by the reaction.

5. The cosmetic powder modification apparatus according to claim 1, characterized in that, The outer casing (11-5) of the device is made of rigid insulating material.

6. A method for modifying cosmetic powders using the cosmetic powder modification apparatus according to any one of claims 1-5, characterized in that, The steps are as follows: (1) Turn on the volume flow controller and introduce gas into the device; wait until the plasma working gas fills the reaction device, then adjust to the gas flow rate required for the reaction process and continue to introduce gas into the device steadily. (2) Turn on and adjust the high-frequency AC power supply to the working voltage so that the air region between the metal disk (11-4) and the high-voltage electrode (11-1) is filled with stable plasma; (3) Turn on the transmission device so that the metal rotating shaft drives the metal disc to reach the working speed; (4) Pour the raw material into the powder raw material inlet (1-1), set the solid flow controller (1-2) to make the powder enter the powder dispersion reaction zone (5) stably, and finally complete the reaction and dispersion; (5) The finished product that has been reacted and dispersed is collected in the finished product powder collection area (7) through the discharge hopper (6); (6) After the preparation is completed, turn off the transmission device and the high-frequency AC power supply in sequence, control the volume flow controller to make the gas flow rate 0 and close the valve of the gas storage bottle; disassemble, inspect and clean the plasma reaction core (11) for easy use next time.

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