Grid spongy foundation make-up air cushion and preparation process thereof

Abstract

The invention belongs to the field of beauty makeup tools, and discloses a grid spongy foundation make-up air cushion and a preparation process thereof.The grid spongy foundation make-up air cushion comprises a sponge body, and the sponge body is made of an elastic high polymer material containing graphene aerogel and polyurethane composite and is of a three-dimensional through grid-shaped pore structure; the latticed pore structure is surrounded by ribs which are arranged in a staggered manner, and the surfaces of the ribs are coated with hydrophilic coatings prepared by taking chitosan and nano cellulose as raw materials; the surface of the sponge body is provided with raised particles for attaching foundation make-up, the raised particles are made of polylactic acid-glycolic acid copolymer (PLGA), the interior of each raised particle is provided with a hollow powder storage cavity, and the powder storage cavities are communicated with the outside through micropores in the surfaces of the raised particles; according to the gridding spongy foundation make-up air cushion and the preparation process thereof, the problems that an existing foundation make-up air cushion is poor in hydrophilicity, uneven in foundation make-up adhesion and poor in make-up effect are solved by adopting special materials and structural design.

Description

Technical Field

[0001] This invention relates to the field of beauty tool technology, specifically to a mesh sponge-like foundation cushion and its preparation process. Background Technology

[0002] Foundation cushion is a makeup tool widely used in the cosmetics industry. Existing foundation cushion sponges are usually made of materials such as ordinary polyurethane sponge or latex sponge.

[0003] 1. These traditional sponges have many shortcomings, such as poor hydrophilicity, which leads to uneven foundation adhesion and easily causes powder to cake or float. 2. An unreasonable sponge structure and uneven pore distribution affect the storage and release of foundation; 3. In addition, the surface of a sponge lacks a special structural design, making it difficult to achieve efficient makeup application and a good makeup effect.

[0004] To address these issues, a mesh-like sponge-like foundation cushion and its preparation process were proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a mesh-like sponge-like foundation cushion and its manufacturing process. By adopting special materials and structural design, it solves the problems of poor hydrophilicity, uneven foundation adhesion, and poor makeup effect of existing foundation cushions, thereby improving the performance and user experience of foundation cushions.

[0006] To achieve the above objectives, the present invention provides the following technical solution: The technical solution provided by this invention is: a mesh-like sponge-like foundation cushion, comprising a sponge body, the sponge body being made of an elastic polymer material containing graphene aerogel and polyurethane composite, having a three-dimensional interconnected mesh-like pore structure; the mesh-like pore structure is formed by staggered ribs, the surface of which is coated with a hydrophilic coating prepared from chitosan and nanocellulose; the surface of the sponge body is provided with raised particles for adhering foundation, the raised particles being made of polylactic acid-glycolic acid copolymer (PLGA), and having a hollow powder storage cavity inside, the powder storage cavity being connected to the outside through micropores on the surface of the raised particles.

[0007] Furthermore, the graphene aerogel accounts for 3%-5% of the mass of the elastic polymer material, the polyurethane accounts for 95%-97% of the mass, the thickness of the ribs is 0.1-0.3mm, and the pore size of the mesh-like pores is 0.8-1.5mm. The preparation method of the hydrophilic coating is as follows: Chitosan is dissolved in an aqueous solution of acetic acid with a mass fraction of 2% to prepare a chitosan solution with a mass concentration of 1.5%; nanocellulose is dispersed in deionized water to prepare a nanocellulose suspension with a mass concentration of 1%; the chitosan solution and nanocellulose suspension are mixed at a volume ratio of 1:1 and stirred evenly to obtain a mixed solution; the reinforcing strip is immersed in the mixed solution by dip coating for 8 minutes, and then dried at 65℃ for 2.5 hours to form a hydrophilic coating with a thickness of 80-120nm. The raised particles are hemispherical, and their distribution density on the surface of the sponge is 80-120 particles / cm². 2 The diameter of the micropores is 0.1-0.3 mm. The present invention also provides a process for preparing a mesh-like sponge-like foundation cushion as described in any of the above claims, comprising the following steps: S1: Preparation of an elastic polymer material composed of graphene aerogel and polyurethane: The graphene aerogel was pulverized to a particle size of less than 50 μm and placed in a high-speed mixer. The mixture was stirred at 800 r / min while the polyurethane prepolymer was slowly added. The addition process lasted for 15 minutes. The mixture was stirred and mixed for 2 hours at 80°C and 300 r / min to obtain a mixture. Ethylenediamine, a chain extender, was added to the mixture at 10% by mass of the polyurethane prepolymer. The mixture was reacted at 60°C for 3 hours to obtain the elastic polymer material. The polyurethane prepolymer was prepared by reacting polytetramethylene ether glycol and diisocyanate at a molar ratio of 1:2 at 70°C for 4 hours. S2: Molded sponge body: A stainless steel mold is used, and the inner wall of the three-dimensional mesh mold cavity is provided with an anti-stick coating (the anti-stick coating is a polytetrafluoroethylene coating with a thickness of 0.05-0.1mm); the prepared elastic polymer material is injected into the mold cavity and cured for 30 minutes at 100℃ and 5MPa to obtain a sponge body blank with a mesh-like pore structure; S3: Preparation of hydrophilic coating: The ribs of the sponge blank are treated with a hydrophilic coating according to the above method for preparing hydrophilic coating; S4: Forming raised particles: Using micro-injection molding process, a coupling agent (silane coupling agent KH-550) is coated on the surface of the sponge body by spraying at a pressure of 0.2-0.3 MPa. After spraying, it is dried at 80°C for 15 minutes. Polylactic acid-glycolic acid copolymer (PLGA) is heated to 190°C to melt and injected into the mold cavity of the raised particles set on the surface of the sponge body at an injection pressure of 100 MPa. After holding the pressure for 10 seconds, it is demolded. During the process of forming raised particles, a powder storage cavity and micropores are reserved.

[0008] The beneficial effects of this technical solution are: (1) The sponge body is prepared using an elastic polymer material composed of graphene aerogel and polyurethane. Graphene aerogel has an extremely high specific surface area and good adsorption properties, which can effectively adsorb and store foundation powder, making the foundation powder more evenly distributed in the sponge body and reducing foundation powder waste. At the same time, the addition of graphene aerogel enhances the elasticity and toughness of the sponge body, making it less prone to deformation and breakage during use, thus extending the service life of the foundation cushion. Polyurethane itself has good flexibility and wear resistance. The combination of the two gives the sponge body both excellent mechanical properties and powder storage performance. (2) The three-dimensional interconnected mesh-like pore structure facilitates the flow and diffusion of foundation within the sponge body, allowing the foundation to adhere more evenly to the surface of the sponge body. The presence of ribs not only enhances the structural strength of the sponge body but also provides a foundation for the adhesion of the hydrophilic coating. The hydrophilic coating is prepared using chitosan and nanocellulose as raw materials. Chitosan has excellent antibacterial properties, which can inhibit the growth of bacteria on the sponge surface and protect the user's skin health; nanocellulose has excellent hydrophilicity and dispersibility. The hydrophilic coating formed by the combination of the two can significantly improve the hydrophilicity of the sponge body, making it easier for the foundation to be absorbed and released, further improving the evenness and smoothness of makeup application. In addition, the raised particles made of PLGA on the surface of the sponge body, with their hollow powder storage chambers and microporous design, can precisely control the amount of foundation released, avoiding the situation of using too much or too little foundation, while also helping to improve the adhesion between the foundation and the skin and enhance the makeup holding effect. (3) The preparation process of the present invention ensures the stability and consistency of product quality by precisely controlling the parameters and operating methods of each step. When preparing the elastic polymer material of graphene aerogel and polyurethane composite, a specific stirring speed and time are used to ensure the uniform dispersion of graphene aerogel in polyurethane prepolymer; during the molding of the sponge body, the stainless steel mold is equipped with a polytetrafluoroethylene anti-stick coating, which facilitates demolding and does not damage the sponge body; the preparation method of the hydrophilic coating has been optimized so that the coating can be uniformly coated on the surface of the ribs; the micro-injection molding process combined with the use of coupling agent realizes the firm bonding between the protruding particles and the sponge body, and ensures the shape and structural accuracy of the protruding particles. Attached Figure Description

[0009] Figure 1 This is a comparative data table showing the differences between various embodiments of the mesh-like sponge-like foundation cushion and its preparation process proposed in this invention; Figure 2 This is a data comparison table of various embodiments of the mesh-like sponge-like foundation cushion and its preparation process proposed in this invention. Detailed Implementation

[0010] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0011] The specific implementation process is as follows: Example 1: Please see Figure 1-2 The present invention provides a technical solution: a process for preparing a mesh-like sponge-like foundation cushion, comprising the following steps: S1: Preparation of elastic polymer materials composed of graphene aerogel and polyurethane: First, prepare the polyurethane prepolymer: add polytetramethylene ether glycol and diisocyanate to a reaction vessel at a molar ratio of 1:2 and react at 70°C for 4 hours to obtain the polyurethane prepolymer; Take graphene aerogel and crush it to a particle size of less than 50μm using a pulverizer. Weigh 3g of the crushed graphene aerogel and place it in a high-speed mixer. Turn on the mixer and stir at a speed of 800r / min. At the same time, slowly add 97g of polyurethane prepolymer for 15 minutes. After the ingredients are added, raise the temperature to 80°C, maintain the rotation speed at 300 r / min, and continue stirring and mixing for 2 hours to obtain the mixture. Add 10% (9.7g) of chain extender ethylenediamine to the mixture and react at 60°C for 3 hours to obtain an elastic polymer material. S2: Molding the sponge body: Prepare a stainless steel mold with a 0.05mm thick polytetrafluoroethylene anti-stick coating on the inner wall of the three-dimensional mesh mold cavity. Inject the prepared elastic polymer material into the mold cavity and place it in a hot press molding machine. Curing is carried out at 100℃ and 5MPa for 30 minutes to obtain a sponge body blank with a mesh pore structure. The thickness of the ribs is 0.1mm and the pore size of the mesh is 0.8mm. S3: Preparation of hydrophilic coating: Chitosan was dissolved in a 2% (w / w) aqueous solution of acetic acid to prepare a 1.5% (w / w) chitosan solution. Nanocellulose was dispersed in deionized water to prepare a nanocellulose suspension with a mass concentration of 1%. Measure chitosan solution and nanocellulose suspension at a volume ratio of 1:1, pour them into the same container, and stir evenly to obtain a mixture. The sponge blank was dip-coated by immersing the ribs of the blank into the mixture for 8 minutes. After being removed, it was placed in a drying oven and dried at 65°C for 2.5 hours to form a hydrophilic coating with a thickness of 80 nm. S4: Formation of raised particles: The surface of the sponge was coated with silane coupling agent KH-550 by spraying at a pressure of 0.2 MPa. After spraying, the sponge was placed in a drying oven and dried at 80°C for 15 minutes. Polylactic acid-glycolic acid copolymer (PLGA) is placed in a heating device and heated to 190°C to melt it; A micro-injection molding process was used, injecting molten PLGA into the mold cavity of raised particles on the surface of the sponge body at an injection pressure of 100 MPa. After holding the pressure for 10 seconds, the particles were demolded. Powder storage cavities and micropores were reserved during the forming process of the raised particles. Measurements showed that the raised particles were hemispherical, with a distribution density of 80 particles / cm² on the surface of the sponge body. 2 The diameter of the micropores is 0.1 mm.

[0012] In this embodiment, the mass ratio of graphene aerogel and polyurethane is 3% and 97%, respectively, which is the lowest among the six embodiments. This ratio results in a large proportion of polyurethane in the material, which to a certain extent determines that the basic properties of the sponge body are dominated by the characteristics of polyurethane. Furthermore, the rib thickness is 0.1mm, the thinnest among all embodiments; the mesh-like pore size is 0.8mm, also a relatively small value; and the distribution density of the raised particles is 80 particles / cm². 2 The micropore diameter is 0.1 mm, which are the lower limits of each embodiment. These structural parameters make the sponge body relatively dense, with relatively small pores and protruding particles. All parameters in the preparation process were set according to the basic settings. For example, the process parameters for stirring and dispersing, curing and molding, coating preparation and injection molding were all benchmark values ​​and no special adjustments were made. Therefore, due to its thinner ribs and smaller pores, the sponge itself has a relatively fine texture. When applying makeup to specific areas, it allows for more precise control over the amount and application area of ​​foundation, such as for touch-ups around the nose and eyes. The presence of a hydrophilic coating ensures that the foundation adheres evenly to the densely structured sponge, preventing localized caking. Although its foundation capacity is relatively small, this sponge structure is convenient to carry and use for everyday light touch-ups, allowing users to complete touch-ups more easily without wasting foundation due to the sponge absorbing too much.

[0013] Example 2: Please see Figure 1-2The present invention provides a technical solution: a process for preparing a mesh-like sponge-like foundation cushion, comprising the following steps: S1: Preparation of elastic polymer materials composed of graphene aerogel and polyurethane: Similarly, polytetramethylene ether glycol and diisocyanate were reacted at 70°C for 4 hours in a molar ratio of 1:2 to prepare polyurethane prepolymer. Take 4g of graphene aerogel that has been pulverized to a particle size of less than 50μm and place it in a high-speed mixer. Stir at 800r / min and slowly add 96g of polyurethane prepolymer over 15 minutes. After heating to 80℃ and stirring at 300r / min for 2 hours, 9.6g of ethylenediamine was added, and the mixture was reacted at 60℃ for 3 hours to obtain an elastic polymer material. S2: Molded sponge body: The mold and molding conditions are the same as in Example 1. After injecting elastic polymer material, it is cured and molded at 100°C and 5MPa pressure for 30 minutes. The thickness of the sponge body blank is 0.2mm and the pore size of the mesh is 1.1mm. S3: Preparation of hydrophilic coating: Same as in Example 1, a hydrophilic coating with a thickness of 100 nm is finally formed; S4: Formation of raised particles: The preparation process is the same as in Example 1, and the density of the raised particles on the surface of the sponge is 100 particles / cm². 2 The diameter of the micropores is 0.2 mm.

[0014] In this embodiment, the graphene aerogel accounts for 4% of the mass and the polyurethane accounts for 96%. Compared with Example 1, the proportion of graphene aerogel has increased, making the ratio of the two components in the material more balanced and bringing about certain changes to the performance of the sponge body. Furthermore, the rib thickness increased to 0.2 mm, the pore size of the mesh-like pores became 1.1 mm, and the distribution density of the raised particles was 100 particles / cm². 2 The micropore diameter is 0.2 mm. Compared with Example 1, all structural parameters have increased, and the pore size and protruding particle size of the sponge are more appropriate. Compared with Example 1, the preparation process and parameters are basically the same, with differences only in material ratio and final product structure parameters; Therefore, the moderate thickness of the ribs and the pore size give the sponge good elasticity and breathability. During use, the sponge can better conform to the facial skin, and the user feels comfortable when pressing the sponge. It can also effectively avoid the skin stuffiness caused by insufficient breathability. The distribution density of the raised particles and the micropore diameter are reasonably set, so that the storage and release of foundation on the sponge can achieve a good balance. Whether it is the first time applying makeup or subsequent touch-ups, it can achieve an even and smooth foundation application, with a natural and long-lasting makeup effect. It is suitable for most daily makeup scenarios and meets the daily use needs of ordinary consumers.

[0015] Example 3: Please see Figure 1-2 The present invention provides a technical solution: a process for preparing a mesh-like sponge-like foundation cushion, comprising the following steps: S1: Preparation of elastic polymer materials composed of graphene aerogel and polyurethane: The preparation of the polyurethane prepolymer is the same as in Example 1; Weigh 5g of pulverized graphene aerogel and put it into a high-speed mixer. Add 95g of polyurethane prepolymer while stirring at 800r / min over 15 minutes. Then stir at 80℃ and 300r / min for 2 hours. Add 9.5g of ethylenediamine and react at 60℃ for 3 hours to obtain an elastic polymer material. S2: Molded sponge body: The mold and molding conditions are the same as in Example 1. After injecting the material, it is hot-pressed to form a sponge body blank with a rib thickness of 0.3mm and a mesh pore diameter of 1.5mm. S3: Preparation of hydrophilic coating: Same as in Example 1, forming a hydrophilic coating with a thickness of 120 nm; S4: Formation of raised particles: The preparation process is the same as in Example 1, and the density of raised particles on the surface of the sponge is 120 particles / cm². 2 The micropore diameter is 0.3 mm.

[0016] In this embodiment, the graphene aerogel accounts for 5% of the mass and the polyurethane accounts for 95%, which is the highest proportion of graphene aerogel among the six embodiments. This may cause the sponge body to have significant differences in mechanical properties and functionality compared with other embodiments. Furthermore, the rib thickness is 0.3mm, the mesh-like pore size is 1.5mm, and the density of raised particles is 120 / cm². 2 The micropore diameter is 0.3 mm, which is the maximum value in all embodiments. The larger rib thickness and pore size, as well as the dense protruding particles and larger micropores, make the sponge structure more porous and have more protruding particles. The preparation process steps are the same as those in other embodiments, but due to differences in material ratios and structural parameters, the requirements for equipment and the precision of process control may differ in actual operation. Therefore, the high proportion of graphene aerogel endows the sponge with excellent mechanical properties, making it more elastic and tough, able to withstand greater pressure and rubbing, less prone to deformation and damage, and with a longer service life. The loose sponge structure and large pore size greatly increase the storage space of foundation, allowing it to absorb more foundation at once. It is especially suitable for large-area makeup applications, such as stage makeup and bridal makeup, where a full face makeup needs to be completed quickly. The dense raised particles and large micropores help improve the release efficiency of foundation. Users only need to press lightly to obtain enough foundation, and the application is smoother, effectively improving the speed and effect of makeup application.

[0017] Example 4: Please see Figure 1-2 The present invention provides a technical solution: a process for preparing a mesh-like sponge-like foundation cushion, comprising the following steps: S1: Preparation of elastic polymer materials composed of graphene aerogel and polyurethane: The preparation of the polyurethane prepolymer is the same as in Example 1; Take 3.5g of graphene aerogel, crush it, and add 96.5g of polyurethane prepolymer and other materials according to the steps to obtain an elastic polymer material. S2: Molding the sponge body: The mold and molding conditions are the same as in Example 1. The thickness of the sponge body blank is 0.15mm and the pore size of the mesh is 0.9mm. S3: Preparation of hydrophilic coating: Same as in Example 1, forming a hydrophilic coating with a thickness of approximately 90 nm; S4: Formation of raised particles: The preparation process is the same as in Example 1, and the distribution density of raised particles on the surface of the sponge body is 90 particles / cm. 2 The diameter of the micropores is 0.15 mm.

[0018] In this embodiment, the graphene aerogel accounts for 3.5% by mass and the polyurethane accounts for 96.5%, which is in the middle range of proportions, and the material properties are between those of Example 1 and Example 2. Furthermore, the rib thickness is 0.15mm, the mesh-like pore size is 0.9mm, and the density of raised particles is 90 particles / cm³. 2 The micropore diameter is 0.15mm, and all structural parameters are at an intermediate level, making the sponge structure relatively balanced. The same preparation process as other embodiments, but with intermediate values ​​set for specific parameters, results in a product with balanced performance. Therefore, the foundation cushion of this embodiment achieves a good balance between various performance aspects. The appropriate material ratio ensures that the sponge has good elasticity and absorption properties, and can stably store and release foundation. The balanced structural parameters make the sponge both delicate enough for precise local makeup application and have enough pores and raised particles to meet the needs of daily full-face makeup. In actual use, it can perform well in both handling facial details and applying makeup to the whole face. It is suitable for consumers who have certain requirements for the overall performance of foundation cushions but do not have special usage scenarios. It is a relatively universal foundation cushion product.

[0019] Example 5: Please see Figure 1-2 The present invention provides a technical solution: a process for preparing a mesh-like sponge-like foundation cushion, comprising the following steps: S1: Preparation of elastic polymer materials composed of graphene aerogel and polyurethane: The polyurethane prepolymer is the same as in Example 1; Weigh 4.5g of graphene aerogel, add 95.5g of polyurethane prepolymer, etc., to prepare an elastic polymer material; S2: Molded sponge body: The mold and molding conditions are the same as in Example 1. The thickness of the ribs of the sponge body blank obtained by molding is 0.25mm, and the pore diameter of the mesh is 1.3mm. S3: Preparation of hydrophilic coating: Same as in Example 1, forming a hydrophilic coating with a thickness of approximately 110 nm; S4: Formation of raised particles: Same as in Example 1, the density of raised particles on the surface of the sponge body is 110 particles / cm². 2 The diameter of the micropores is 0.25 mm.

[0020] In this embodiment, the graphene aerogel accounts for 4.5% by mass and the polyurethane accounts for 95.5%, which is close to the high proportion in Example 3, and the material properties are developing in the direction of enhancement. Furthermore, the rib thickness is 0.25mm, the mesh-like pore size is 1.3mm, and the density of raised particles is 110 particles / cm³. 2 The micropore diameter is 0.25mm, the structural parameters are at a high level, the sponge structure is more loose and the protruding particles are more dense; The preparation process is the same as in other embodiments. Under the influence of material ratio and structural parameters, the product performance shows strong practicality. Therefore, the near-high proportion of graphene aerogel significantly improves the sponge's mechanical properties and functionality, allowing it to maintain good elasticity and shape even after multiple uses and washes. The loose yet dense structural design further optimizes the storage and release performance of foundation, not only holding more foundation but also ensuring more even distribution of foundation on the skin's surface during application, reducing the problem of heavy makeup caused by repeated application. This performance characteristic makes the foundation cushion perform excellently in long-term makeup scenarios, such as extended outdoor activities and business meetings, allowing users to maintain a good makeup look without frequent touch-ups.

[0021] Example 6: Please see Figure 1-2 The present invention provides a technical solution: a process for preparing a mesh-like sponge-like foundation cushion, comprising the following steps: S1: Preparation of elastic polymer materials composed of graphene aerogel and polyurethane: The preparation process of the polyurethane prepolymer is the same as in Example 1; Take 3g of graphene aerogel and 97g of polyurethane prepolymer, and prepare elastic polymer material according to the process. However, during the stirring and mixing process, the stirring speed at 80℃ is increased to 350r / min. S2: Molding the sponge body: The mold and molding conditions are the same as in Example 1. The thickness of the ribs of the obtained sponge body blank is 0.1 mm, and the pore diameter of the mesh is 0.8 mm. S3: Preparation of hydrophilic coating: Same as in Example 1, forming a hydrophilic coating with a thickness of 80 nm; S4: Formation of raised particles: Same as in Example 1, the density of raised particles on the surface of the sponge body is 80 particles / cm². 2 The micropore diameter is 0.1 mm.

[0022] In this embodiment, the mass ratio of graphene aerogel to polyurethane is the same as in Example 1, which is 3% and 97%, respectively. However, the stirring speed was changed during the preparation process. Furthermore, the rib thickness is 0.1 mm, the mesh-like pore size is 0.8 mm, and the density of raised particles is 80 particles / cm². 2 The micropore diameter is 0.1 mm, which is completely consistent with the structural parameters of Example 1; In the preparation of the elastic polymer material composed of graphene aerogel and polyurethane, the stirring speed at 80°C was increased to 350 r / min. This process adjustment made the graphene aerogel more uniformly dispersed in the polyurethane prepolymer, thus affecting the mechanical properties of the final product. Therefore, although the material ratio and structural parameters are the same as in Example 1, the increase in stirring speed significantly improves the dispersibility of graphene aerogel in polyurethane prepolymer, thereby enhancing the mechanical properties of the sponge body. In actual use, the foundation cushion exhibits better toughness and tear resistance. Even after frequent use and washing, the sponge is not prone to damage or deformation. At the same time, uniform material dispersion also helps to improve the sponge's adsorption and storage stability of foundation, ensuring that the amount of foundation released is uniform each time it is used, resulting in a more stable and reliable makeup effect and providing users with a more durable makeup experience.

[0023] Please see Figure 1-2 : Compared to existing technologies, this technology has several advantages. Existing technologies often use single or simple composite materials for foundation cushion sponges. This technology uses an elastic polymer material composed of graphene aerogel and polyurethane. Taking Examples 1-6 as examples, different proportions of graphene aerogel and polyurethane composites give the sponge unique properties. For example, the 5% graphene aerogel content in Example 3 gives the sponge better mechanical and adsorption properties. Compared to traditional sponges, it has stronger elasticity and toughness, and its ability to adsorb foundation is significantly improved, enabling it to store and release foundation more evenly.

[0024] Existing technologies have deficiencies in hydrophilic coating materials and preparation processes. This technology uses chitosan and nanocellulose to prepare a hydrophilic coating. In all six embodiments, the coating is prepared using the same scientific method. The reinforcing strip is immersed in a mixture of a specific ratio and concentration for 8 minutes and dried at 65°C for 2.5 hours to form a coating with a thickness of 80-120 nm. This greatly improves the hydrophilicity of the sponge, allowing the foundation to adhere better to the sponge surface and avoiding powder caking and floating. Existing technologies cannot achieve such a stable and good hydrophilic effect.

[0025] The raised particles are made of polylactic acid-glycolic acid copolymer (PLGA), a design lacking in the prior art. In various embodiments, the raised particles made of PLGA have a hollow powder storage cavity and surface micropores. For example, in Example 2, the distribution density of the raised particles is 100 particles / cm³. 2 With a micropore diameter of 0.2mm, this structure increases the foundation storage space, enabling precise control of the foundation release and improving the makeup effect, which is something that existing technologies cannot achieve.

[0026] The sponge body of this technology has a three-dimensional through-grid pore structure. Although the thickness of the ribs and the pore size of the grid are different in the six embodiments, they are all superior to the existing technology. For example, in embodiment 5, the thickness of the ribs is 0.25mm and the pore size of the grid is 1.3mm. This structure makes the storage and release of foundation in the sponge more uniform, while the traditional sponge pore structure is unreasonable, resulting in uneven storage and release of foundation.

[0027] The unique raised particle design is a major highlight of this technology. In each embodiment, the distribution density and micropore diameter of the raised particles are different; for example, in embodiment 4, the distribution density is 90 particles / cm. 2 With a micropore diameter of 0.15mm, it can effectively improve the adhesion and application of foundation, achieving a more even and convenient makeup application. Existing sponge surfaces lack this structural design and cannot achieve the same makeup effect.

[0028] Through material and structural innovations and optimized manufacturing processes, this technology's foundation cushion surpasses existing technologies in overall performance and user experience. In each embodiment, regardless of the parameter combination, it effectively solves problems such as uneven foundation storage and release, poor hydrophilicity, and unsatisfactory makeup effects found in existing foundation cushions. For example, although the parameters in Embodiment 1 are relatively low, it still ensures even foundation adhesion; Embodiment 3 performs excellently in large-area makeup application and quick touch-ups. At the same time, this technology's foundation cushion also has potential improvements in antibacterial properties, such as the antibacterial effect that graphene aerogel may bring, better protecting the user's skin health and enhancing the overall user experience.

[0029] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific technical solutions or characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A mesh-sponge-like foundation air cushion, characterized in that, The sponge body is made of elastic polymer material containing graphene aerogel and polyurethane composite, and has a three-dimensional grid-shaped pore structure; the grid-shaped pore structure is surrounded by staggered ribs, and the rib surface is coated with a hydrophilic coating prepared from chitosan and nanocellulose as raw materials; the sponge body surface is provided with raised particles for attaching foundation, the raised particles are made of polylactic acid-glycolic acid copolymer (PLGA), and have a hollow powder storage cavity inside, which is communicated with the outside through micropores on the surface of the raised particles.

2. The mesh-sponge-like foundation air cushion according to claim 1, characterized in that, The mass ratio of the graphene aerogel in the elastic polymer material is 3%-5%, the mass ratio of the polyurethane is 95%-97%, the thickness of the rib is 0.1-0.3mm, and the pore size of the grid-shaped pore is 0.8-1.5mm.

3. The mesh-sponge-like foundation air cushion of claim 1, wherein, The preparation method of the hydrophilic coating is as follows: chitosan is dissolved in an acetic acid aqueous solution with a mass fraction of 2% to prepare a chitosan solution with a mass concentration of 1.5%; Nanocellulose is dispersed in deionized water to prepare a nanocellulose suspension with a mass concentration of 1%; The chitosan solution and the nanocellulose suspension are mixed in a volume ratio of 1:1, and a mixed solution is obtained after uniform stirring; The rib is immersed in the mixed solution by dip coating, the dip coating time is 8 minutes, and the rib is taken out and dried at 65°C for 2.5 hours to form a hydrophilic coating with a thickness of 80-120nm.

4. The mesh-sponge-like foundation air cushion of claim 1, wherein, The convex particles are semispherical, and the distribution density on the surface of the sponge body is 80-120 per cm 2 The diameter of the micropores is 0.1-0.3 mm.

5. A process for the preparation of a mesh sponge-like foundation air cushion according to any one of claims 1 to 4, characterized in that, The method comprises the following steps: S1: preparing an elastic polymer material containing graphene aerogel and polyurethane composite: the graphene aerogel is crushed to a particle size of less than 50μm, and is placed in a high-speed stirring disperser, stirred at a speed of 800r / min, and polyurethane prepolymer is slowly added during the process, which lasts for 15 minutes; continue to stir and mix at 80°C and a speed of 300r / min for 2 hours to obtain a mixture; add a chain extender ethylenediamine with a mass of 10% of the polyurethane prepolymer to the mixture, and react at 60°C for 3 hours to prepare the elastic polymer material; S2: forming a sponge body: a mold made of stainless steel is used, and a three-dimensional grid-shaped mold cavity is provided with an anti-sticking coating on the inner wall; the prepared elastic polymer material is injected into the mold cavity, and is cured and formed at 100°C and a pressure of 5MPa for 30 minutes to obtain a sponge body blank with a grid-shaped pore structure; S3: preparing a hydrophilic coating: the rib of the sponge body blank is treated with a hydrophilic coating according to the method of claim 3; S4: forming a raised particle: a micro-injection molding process is used, a coupling agent is coated on the surface of the sponge body, the coupling agent is silane coupling agent KH-550; polylactic acid-glycolic acid copolymer (PLGA) is heated to 190°C to melt, and is injected into a raised particle mold cavity provided on the surface of the sponge body at an injection pressure of 100MPa, and is demolded after pressure maintaining for 10 seconds, and the powder storage cavity and micropores are reserved during the forming of the raised particle.

6. Process for the preparation of a mesh sponge-like cushion of foundation according to claim 5, characterized in that, The polyurethane prepolymer in S1 is prepared by reacting polytetramethylene ether glycol and diisocyanate at a molar ratio of 1:2 at 70°C for 4 hours.

7. The process for the preparation of a mesh-spongey foundation air cushion according to claim 5, characterized in that, The anti-sticking coating in S2 is a polytetrafluoroethylene coating, and the coating thickness is 0.05-0.1 mm.

8. The process for the preparation of a mesh-spongey foundation air cushion according to claim 5, characterized in that, The coating method of the silane coupling agent KH-550 in S4 is spraying, the spraying pressure is 0.2-0.3 MPa, and after spraying, drying is performed at 80 DEG C for 15 minutes.

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