Preparation method for cosmetic powder block having dot-staining effect, and cosmetic powder block

Abstract

The present application provides a preparation method for a cosmetic powder block having a dot-staining effect, and a cosmetic powder block. The preparation method comprises: preparing a powder block base material: preparing a dot-staining base material, and mixing the dot-staining base material with a water-insoluble coloring material to obtain a dot-staining material body; dot-applying the dot-staining material body to a predetermined position at the bottom of the cavity of a mold; filling the mold with a predetermined amount of the powder block base material after the dot application; freezing and demolding the mixed material body in the mold; and freeze-drying the demolded powder material master product to obtain the cosmetic powder block having a dot-staining effect, wherein the powder block base material and the dot-staining material body are flowable at normal temperature and pressure. The cosmetic powder block prepared according to the method of the present application can achieve the dot-staining effect seen in traditional Chinese gongbi paintings, and the edges of dot-staining regions are clear. The powder block does not develop fine cracks during the preparation process and has good drop resistance.

Description

Preparation method of cosmetic powder block with tinting effect and cosmetic powder block

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411763231.8, filed on December 2, 2024, entitled “Preparation method of cosmetic powder block with dotting effect and cosmetic powder block”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application belongs to the field of daily cosmetics technology, specifically relating to a method for preparing a cosmetic powder block with a dotting effect and the cosmetic powder block itself. Background Technology

[0004] Powder cosmetics can enhance facial features and add radiance to the makeup. For example, highlighter can brighten specific areas, improve facial contours, make the base makeup more radiant, eliminate dullness, and create visual contrast between light and shadow to enhance the three-dimensionality of facial features.

[0005] On the one hand, based on the functional requirements of cosmetic powder compacts, there is a need to develop multi-color blending powder compacts. On the other hand, as the cosmetics industry has developed, developers have increasingly emphasized the emotional value that cosmetics provide to users. This emotional value is mainly reflected in stimulating positive emotions in users through the visual appeal, texture, and scent of cosmetic products, thereby influencing their psychological state and the effectiveness of skincare and makeup. Therefore, the appearance and blending effects of multi-color blending cosmetic powder compacts are also highly valued. However, currently available traditional cosmetic powder compacts on the market are relatively monotonous in appearance, and the patterns and styles of the powder compacts need further development. Summary of the Invention

[0006] In view of this, this application provides a method for preparing a cosmetic powder block with a dotting effect and the cosmetic powder block itself, so that the prepared cosmetic powder block not only has the dotting effect of traditional Chinese fine brush painting, but also has good resistance to falling.

[0007] In a first aspect, embodiments of this application provide a method for preparing a cosmetic powder block with a dotting effect, comprising the following steps: preparing a powder block base material: mixing raw materials for preparing cosmetic powder blocks to obtain a powder block base material; preparing a dotting dye body: preparing at least one dotting base material, mixing the dotting base material with at least one water-insoluble coloring material to obtain at least one dotting dye body; the water-insoluble coloring material is selected from water-insoluble pigment powder or lake; dotting: providing a mold, the mold having at least one upward-opening cavity, and dotting at least one dotting dye body at at least one preset position at the bottom of the cavity; filling: filling the dotting base material into the mold after dotting according to a preset amount to obtain a mixed material; freezing and demolding: freezing the mixed material in the mold to obtain a powder master product, and then separating the powder master product from the mold; freeze-drying: freeze-drying the demolded powder master product to obtain a cosmetic powder block with a dotting effect; wherein, the powder block base material and the dotting dye body have fluidity at room temperature and pressure.

[0008] According to an embodiment of the first aspect of this application, the viscosity of the powder base material and the dot dye body at 25°C is below 6000 cP; preferably, the viscosity of the powder base material and the dot dye body at 25°C is 2500 cP to 5000 cP.

[0009] According to an embodiment of the first aspect of this application, the powder base material and the spot dyeing base material are composed of the same or different components; preferably, the powder base material and the spot dyeing base material are composed of the same components.

[0010] According to an embodiment of the first aspect of this application, the step of filling the mold after dotting with powder base material in a preset amount includes: at room temperature, filling the mold after dotting with powder base material in a preset amount via a pneumatic feeding device.

[0011] According to an embodiment of the first aspect of this application, the pressure in the pneumatic feeding device is 0.01 to 0.06 MPa, preferably 0.02 to 0.04 MPa.

[0012] According to an embodiment of the first aspect of this application, the step of freezing the mixture in the mold is carried out in a liquid nitrogen quick-freezing device, the temperature inside the liquid nitrogen quick-freezing device being -120 to -70°C, preferably -95 to -80°C.

[0013] According to an embodiment of the first aspect of this application, freeze drying includes pre-freezing, sublimation drying, and desorption drying.

[0014] According to an embodiment of the first aspect of this application, the mold is made of TPR, TPE, silicone, silicone rubber, rubber or metal; the bottom of the mold cavity may or may not have a three-dimensional pattern.

[0015] According to an embodiment of the first aspect of this application, the raw materials used to prepare cosmetic powder blocks include a powder phase component, an oil phase component, and an aqueous phase component, and the raw materials form an oil-in-water emulsion system.

[0016] Secondly, embodiments of this application provide a cosmetic powder block with a dotting effect, prepared by any of the methods described above; optionally, the cosmetic powder block is selected from pressed powder, blush, eyeshadow or highlighter.

[0017] Compared with the prior art, this application has at least the following beneficial effects:

[0018] The method provided in this application ingeniously utilizes water-insoluble coloring materials combined with freeze-drying technology to achieve the dot-dye effect of traditional Chinese meticulous brushwork painting on the surface of cosmetic powder blocks. Specifically, water-insoluble pigments or lakes provide dot-dye coloring, which is mixed with a dot-dye base material and then dot-applied into a mold. Next, the powder base material is filled in. Because the powder base material and the dot-dye body have good fluidity at room temperature and pressure, they can achieve good mixing at the material contact surface. Simultaneously, the water-insoluble coloring material does not easily diffuse in the mixture, thus forming a localized, irregular dot-dye effect on the surface and inside the cosmetic powder block contacting the bottom of the mold cavity. Then, freeze-drying and demolding steps are performed to further reduce the cracking rate of the powder block and improve its drop resistance, ultimately obtaining the cosmetic powder block with the dot-dye effect of this application. Attached Figure Description

[0019] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings, wherein the same or similar reference numerals denote the same or similar features.

[0020] Figure 1 is a schematic diagram of the product of Embodiment 1 provided in this application. Detailed Implementation

[0021] To make the purpose, technical solution, and beneficial technical effects of this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the embodiments described in this specification are merely for explaining this application and are not intended to limit it.

[0022] For simplicity, this application only explicitly discloses some numerical ranges. However, any lower limit can be combined with any upper limit to form a range not explicitly stated; and any lower limit can be combined with other lower limits to form a range not explicitly stated, just as any upper limit can be combined with any other upper limit to form a range not explicitly stated. Furthermore, although not explicitly stated, every point or individual value between the endpoints of the range is included within that range. Therefore, each point or individual value can be used as its own lower or upper limit and combined with any other point or individual value or with other lower or upper limits to form a range not explicitly stated.

[0023] In the description of this application, it should be noted that, unless otherwise stated, "above" and "below" include the stated number, and "multiple" in "one or more" means two or more.

[0024] The foregoing description of this application is not intended to describe every disclosed implementation or method. Instead, the following description provides more specific examples of exemplary embodiments. Throughout the application, guidance is provided through a series of embodiments that can be used in various combinations. The examples listed are representative only and should not be construed as exhaustive.

[0025] Dotting and dyeing is one of the main expressive techniques in traditional Chinese meticulous brushwork painting, particularly for freehand flowers and plants. It refers to the method of directly applying ink or color with a brush. The main characteristic of this method is that the idea precedes the brushstroke, the brushstroke forms the shape, and the painting is completed in one go, creating irregular, fixed-point coloring effects in certain parts of the artwork.

[0026] The inventors of this application wish to achieve the dotting effect of traditional Chinese painting on the surface of cosmetic powder. However, surface decoration methods such as inkjet printing or dripping and impregnating colorants on the prepared cosmetic powder block or the surface of a pre-formed powder block do not yield satisfactory results. For example, inkjet printing can only form a very thin layer of surface decoration on the powder block, which disappears after slight wiping or use. Similarly, the dripping and impregnating colorant method suffers from poor penetration of the colorant on the powder block surface, leading to the same problem of disappearance after slight wiping or use. Increasing the amount of colorant causes uncontrollable peripheral diffusion, resulting in unclear edges of the colored area and potentially causing unevenness, cracking, or partial peeling of the colored area on the powder block surface.

[0027] In view of the above problems, this application provides a method for preparing a cosmetic powder block with a dotting effect, which can prepare a cosmetic powder block with a dotting effect, the edge of the dotting area of ​​the powder block is clear, and the powder block is not easy to crack and has good drop resistance.

[0028] Preparation method of cosmetic powder block with dabbing effect

[0029] In a first aspect, embodiments of this application provide a method for preparing a cosmetic powder block with a dotting effect, comprising the following steps: preparing a powder block base material: mixing raw materials for preparing cosmetic powder blocks to obtain a powder block base material; preparing a dotting dye body: preparing at least one dotting base material, mixing the dotting base material with at least one water-insoluble coloring material to obtain at least one dotting dye body; the water-insoluble coloring material is selected from water-insoluble pigment powder or lake; dotting: providing a mold, the mold having at least one upward-opening cavity, and dotting at least one dotting dye body at at least one preset position at the bottom of the cavity; filling: filling the dotting base material into the mold after dotting according to a preset amount to obtain a mixed material; freezing and demolding: freezing the mixed material in the mold to obtain a powder master product, and then separating the powder master product from the mold; freeze-drying: freeze-drying the demolded powder master product to obtain a cosmetic powder block with a dotting effect; wherein, the powder block base material and the dotting dye body have fluidity at room temperature and pressure.

[0030] In this embodiment, the dye body uses a water-insoluble coloring material, which does not easily migrate or diffuse in the material, thus forming a localized and irregular fixed-point dyeing effect on the surface and inside the bottom of the mold cavity where the cosmetic powder block contacts the mold cavity; the surface where the cosmetic powder block contacts the bottom of the mold cavity is the user-facing surface.

[0031] This application does not limit the specific type of water-insoluble pigment, and can be selected as needed. In some embodiments, the water-insoluble pigment is selected from one or more of the inorganic pigments with the following CI numbers: CI77492, CI77491, CI77499, CI77891, CI77742, CI77007, CI77288, CI77289, CI77510; or the water-insoluble pigment is selected from one or more of the organic pigments with the following CI numbers: CI77266, CI15850.

[0032] This application does not limit the specific type of lake, and can be selected as needed. In some embodiments, the lake is selected from one or more of the following CI numbers: CI15850, CI45380, CI45410, CI73360, CI17200, CI16035, CI42090, CI19140, CI15985, and CI47005. Lakes not only maintain their particulate form and insolubility in most solvents, ensuring that the colorant does not undergo significant pigment migration and diffusion in the material; they also possess bright colors, high tinting strength, and good lightfastness, resulting in vivid, dynamic, stable, and long-lasting dotted colors.

[0033] In this application, both the powder base material and the dot dye body must possess fluidity under normal temperature and pressure. Normal temperature refers to an environment with a temperature range of 20–30°C, and normal pressure refers to the atmospheric pressure experienced in daily life or the workplace, typically 1013.25 millibars (mb) or 760 millihrom (mmHg). In the implementation of this application, the interfacial compatibility between the dot dye body and the powder base material is a crucial factor affecting the quality of the powder. If the powder base material or the dot dye body has already tended to solidify before being filled into the mold after dot coating or during the filling process, a poorly compatible interface may exist between the two materials after filling, increasing the likelihood of powder cracking. In this application, by controlling the fluidity of the powder base material and the dot dye body under normal temperature and pressure, good intermixing is ensured at the contact interface between the powder base material and the dot dye body during the filling process, improving interfacial compatibility and reducing powder cracking.

[0034] Furthermore, during the drying and dehydration process of powder blocks, if conventional heating methods are used, the different compositions of the dye and the powder block base material can lead to varying shrinkage rates during heating and drying. This can result in cracking between the dyed area and the powder block base, and poor resistance to drop. Simultaneously, during drying, the evaporation of moisture is often accompanied by localized pigment migration, causing unclear edges in the dyed area. Therefore, this application employs freeze-drying to dry the powder blocks. Freeze-drying involves freezing the water-containing material below its freezing point, converting the water into ice, and then removing the ice by converting it into vapor under a high vacuum. Compared to drying methods such as baking, freeze-drying maintains the stability of the material structure and reduces material shrinkage, thereby improving the problems of cracking and poor resistance to drop between the dyed area and the powder block base. In addition, freeze-drying can preserve the color of the raw material to a great extent; the color in the dyed area is less prone to migration and loss during drying, and the boundaries of the dyed area are clearer.

[0035] Specifically, in the mixing step, the raw materials for preparing the cosmetic powder block with a dotting effect can be commercially available or homemade. It is understood that the raw materials for preparing the cosmetic powder block with a dotting effect typically include a powder phase component, an oil phase component, and an aqueous phase component. The raw materials can be mixed using various methods commonly used in existing technologies, such as mechanical stirring, by adding the raw materials step by step and mixing them evenly. Homogenization and defoaming operations can be added during the mixing process. Different mixing methods and steps can be used depending on the raw materials, and this application is not limited to these.

[0036] In preparing water-insoluble coloring materials, the embodiments of this application may use the same water-insoluble coloring material or two or more water-insoluble coloring materials.

[0037] The powder matrix in this embodiment may include other colorants that are different from the coloring material of the dotted area, or it may not include any colorants, depending on the color required for the powder matrix outside the dotted area.

[0038] In this embodiment, the specific location of the preset position is not limited, and can be selected according to the design. For example, the preset position is a position with a three-dimensional pattern at the bottom of the chamber.

[0039] In the filling step of this application embodiment, the preset amount can be set according to the volume of the powder cosmetic, the mold capacity, or the filling requirements. The preset amount for each filling can be the same or different.

[0040] The preparation method provided in this application can achieve mass production and high production efficiency.

[0041] In summary, the method provided in this application ingeniously utilizes water-insoluble coloring materials combined with freeze-drying technology to achieve the dot-dye effect of traditional Chinese meticulous brushwork painting on the surface of cosmetic powder blocks. Specifically, water-insoluble pigments or lakes provide dot-dye coloring, which is mixed with a dot-dye base material and then dot-applied into a mold. Next, the powder block base material is filled in. Because the powder block base material and the dot-dye body have good fluidity at room temperature and pressure, they can achieve good mixing at the material contact surface. Simultaneously, the water-insoluble coloring material does not easily diffuse in the mixture, thus forming a localized, irregular dot-dye effect on the surface and inside the cosmetic powder block contacting the bottom of the mold cavity. Then, freeze-drying and demolding steps are performed to further reduce the cracking rate of the powder block and improve its drop resistance, ultimately obtaining the cosmetic powder block with the dot-dye effect of this application.

[0042] In some embodiments, the viscosity of the powder base material and the dot dye body at 25°C is less than 6000 cP. In other embodiments, the viscosity of the powder base material and the dot dye body at 25°C is 2500 cP to 5000 cP, so that the interfacial compatibility between the dot dye body and the powder base material is good at room temperature and pressure, and both the powder base material and the dot dye body have good flowability during dot coating and filling. During the filling process, the materials at the two interfaces form good intermixing, reducing the cracking of the powder.

[0043] For example, the viscosity of the powder base material at 25°C can be 6000 cP, 5000 cP, 4500 cP, 4000 cP, 3500 cP, 3000 cP, 2500 cP, 2000 cP, 1500 cP, 1000 cP, or any two of the above values.

[0044] For example, the viscosity of the dot dye body at 25°C can be 6000 cP, 5000 cP, 4500 cP, 4000 cP, 3500 cP, 3000 cP, 2500 cP, 2000 cP, 1500 cP, 1000 cP, or any two of the above values.

[0045] In some embodiments, the powder base material and the dyeing base material can be composed of the same components or different components. When the powder base material and the dyeing base material have the same components, the interfacial compatibility between the powder base material and the dyeing base material is better, which helps to reduce the cracking of the powder.

[0046] In some embodiments, the step of filling the mold after dotting with powder base material in a preset amount includes: filling the mold after dotting with powder base material in a preset amount via a pneumatic feeding device at room temperature.

[0047] Conventional material filling is performed under heating conditions, such as maintaining the material temperature between 40 and 80°C, to ensure good fluidity of the material under heating. However, for this application, a high-temperature environment increases localized pigment transfer in the stained area, affecting the clarity of the stained area's edges. Therefore, this application employs filling under ambient temperature conditions, defined as 20°C to 30°C. For example, filling is performed at temperatures of 20°C, 22°C, 24°C, 25°C, 26°C, 28°C, and 30°C.

[0048] In this embodiment of the application, a pneumatic feeding device is used for filling. The powder block base material is quantitatively filled into the mold through the pneumatic feeding device. The pneumatic feeding assists the powder block base material in filling the mold, avoids small air bubbles at the sharp corners of the fine relief of the cosmetic powder block, and makes the cosmetic powder block more resistant to drop.

[0049] A pneumatic feeding device refers to a device that fills material into a mold by means of pneumatic conveying. Exemplarily, a pneumatic feeding device may include an air pump and a pipe connected to the air pump, the air pump being used to provide the air pressure required for conveying, and the pipe being used to fill the material into the mold; however, this application is not limited thereto.

[0050] Specifically, the powdered material can be pressed into the mold by air pressure. For example, the pneumatic feeding device includes a feed pipe, an air pump, and a discharge pipe. The air pump provides the conveying air pressure to draw the powdered material into the pneumatic feeding device through the feed pipe and then press it into the mold through the discharge pipe. The powdered material can also be drawn into the mold by air pressure. For example, the pneumatic feeding device is connected to the mold, and the pneumatic feeding device provides the conveying air pressure to draw the powdered material into the mold.

[0051] In some embodiments, the pressure in the pneumatic feeding device is 0.01 to 0.06 MPa, or 0.02 to 0.04 MPa. Exemplarily, the pressure in the pneumatic feeding device can be 0.01 MPa, 0.02 MPa, 0.03 MPa, 0.04 MPa, 0.065 MPa, 0.06 MPa, or a range consisting of any two of the above values.

[0052] In some embodiments, the step of solidifying the powder masterbatch at low temperature is performed in a liquid nitrogen quick-freezing apparatus. Exemplarily, the liquid nitrogen quick-freezing apparatus may be a liquid nitrogen tunnel, a liquid nitrogen freezer, an ultra-low temperature freezer, etc., and these apparatuses are commercially available and are not limited thereto.

[0053] After the filling step is completed, a pre-cured powder masterbatch is obtained in the mold. Subsequently, the powder masterbatch is subjected to extremely low-temperature curing using a liquid nitrogen quick-freezing device. The raw material components in the powder masterbatch undergo molecular quick-freezing in an extremely low-temperature environment within the liquid nitrogen quick-freezing device. Cosmetic materials contain components such as oils and emulsions. During their freezing and shaping process, they experience a maximum ice crystal formation zone, approximately -10 to 0°C, where about 80% of the liquid (water, emulsion, etc.) turns into ice. Unlike conventional freezing performed before demolding in existing technologies, the molecular quick-freezing process completed in this application within a liquid nitrogen tunnel allows the powder masterbatch to rapidly pass through the maximum ice crystal formation zone. The ice crystals in the powder masterbatch are more fine and uniformly distributed. In the subsequent freeze-drying step, these fine and uniform ice crystals are directly converted into vapor and removed, further improving the drop resistance of the freeze-dried powder.

[0054] In some embodiments, the liquid nitrogen quick-freezing device is a liquid nitrogen tunnel, and the temperature inside the liquid nitrogen tunnel is -120 to -70°C, preferably -95 to -80°C. A liquid nitrogen tunnel, also known as a liquid nitrogen tunnel-type quick-freezing machine, is a device that uses liquid nitrogen as a cold source and employs a continuous production method, conveying materials into the quick-freezing tunnel via a conveyor belt to achieve continuous material entry and exit and rapid freezing. For example, the powder masterbatch passes through the liquid nitrogen tunnel on the conveyor belt at a speed of 0.4 to 1.2 meters per minute, and the transit time of the powder masterbatch within the liquid nitrogen tunnel is 6 to 10 minutes.

[0055] In some embodiments, the freeze-drying is performed in a freeze-drying apparatus.

[0056] In some embodiments, freeze drying includes pre-freezing, sublimation drying, and desorption drying. Freeze drying includes pre-freezing, sublimation drying, and desorption drying. Exemplarily, freeze drying may employ the following steps: pre-freezing is performed at -50 to -40°C for 0.3 to 0.5 hours; sublimation drying includes heating the powder masterbatch to -3°C to 3°C, the heating process including several first heating stages and several first holding stages, with the first heating stages and first holding stages alternating, the first heating stages heating at 0.5 to 1°C / min for 10 to 20 minutes, and the first holding time for 1.5 to 2 hours; desorption drying includes drying the cured powder masterbatch at 20°C to 60°C, the drying process including several second heating stages and several second holding stages, with the second heating stages and second holding stages alternating, the second heating stages heating at 0.5 to 1°C / min for 10 to 20 minutes, and the second holding time for 1.5 to 2 hours. The process parameters for freeze drying can be adjusted in actual production, and this application does not limit this.

[0057] Sublimation drying in this application can be understood as a drying method in which the material to be dried is rapidly frozen, and then the ice is sublimated into water vapor under high vacuum conditions to remove it. Desorption drying in this application can be understood as a drying method in which the material to be dried is placed under negative pressure or vacuum conditions, and the material is dried by controlling its melting point after being appropriately heated to reach the boiling point under negative pressure or by cooling to allow the material to solidify. In some embodiments of this application, pre-freezing may be omitted, and sublimation drying and desorption drying may be performed directly, or only sublimation drying may be performed.

[0058] In some embodiments, the solvent content in the prepared cosmetic powder block is less than 5%, preferably less than 1%.

[0059] In some embodiments, the mold is made of TPR, TPE, silicone, silicone rubber, rubber or metal; the bottom of the mold cavity may or may not have a three-dimensional pattern.

[0060] The preparation method in this application embodiment can use the above-mentioned TPR, TPE, silicone, silicone rubber, rubber or metal molds, all of which can prepare powder cosmetics with dotting effect.

[0061] The bottom of the cavity of the selected mold can be flat and without a three-dimensional pattern; or the bottom of the cavity of the mold can have a three-dimensional pattern. The three-dimensional pattern can be diverse. For example, the three-dimensional pattern can be a flower. The embodiments of this application are not limited to this.

[0062] In some embodiments, the dotting effect is formed on the contact surface between the cosmetic powder block and the bottom of the chamber, and extends into the interior of the cosmetic powder block. The extension distance can be adjusted by controlling the amount of dotting dye.

[0063] In some embodiments, the raw materials used to prepare cosmetic powder blocks include a powder phase component, an oil phase component, and an aqueous phase component, and the raw materials form an oil-in-water emulsion system.

[0064] In some embodiments, the powder component includes one or more of fillers and colorants;

[0065] The oil phase components include one or more of the following: emollients, antioxidants, and sunscreens;

[0066] The aqueous phase components include one or more of the following: solvent, thickener, film-forming agent, emulsifier, preservative, and active ingredient.

[0067] In the embodiments of this application, the raw materials form an oil-in-water emulsion system. The oil-in-water emulsion system uses water as the continuous phase, which allows water-soluble pigments to flow better and the gradient effect to be more natural.

[0068] In some embodiments, the thickener and film-forming agent are selected from natural water-soluble polymers or their derivatives, synthetic water-based polymers or water-based inorganic thickeners;

[0069] The natural water-soluble polymer or its derivatives are selected from at least one of the following: alginic acid, agar, carrageenan, xanthan gum, gellan gum, chondrus crispus, xanthan gum, guar gum, tamarind gum, tara gum, gum arabic, astragalus gum, pectin, arabinogalactan, wheat protein, soybean protein, gelatin, casein, chitosan, condensed polysaccharide, cyclodextrin, hyaluronic acid, konjac gum, tremella polysaccharide, guar gum, microcrystalline cellulose, methylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, starch phosphate, starch, sodium hydroxymethyl starch, sodium polyacrylate grafted starch, and hydroxypropyl guar gum.

[0070] The synthesized waterborne polymer is selected from at least one of the following: acrylic (ester) / C10-30 alkanol acrylate crosspolymer, carbomer, acrylic (ester) / octylacrylamide copolymer, acrylic (ester) / ethylhexyl acrylate copolymer, sodium acrylate / sodium acryloyldimethyl taurate copolymer, acrylic (ester) / octylacrylamide copolymer, styrene / acrylate copolymer, acrylic (ester) copolymer, hydroxyethyl acrylate / sodium acryloyldimethyl taurate copolymer, polyacrylate crosspolymer-6, acrylic (ester) / stearyl ether-20 methacrylate copolymer, ammonium acryloyldimethyl taurate / behenol ether-25 methacrylate crosspolymer, ammonium acrylic (ester) copolymer, sodium polyacrylate, sodium polyacryloyldimethyl taurate, polyacrylamide, polyvinylpyrrolidone, polyvinyl alcohol, VP / VA copolymer, polyurethane-1, and polyurethane-35.

[0071] The water-based inorganic thickener is selected from at least one of magnesium aluminum silicate, lithium sodium magnesium silicate, lithium magnesium silicate, sodium magnesium silicate, montmorillonite, or their derivatives.

[0072] In some embodiments, the emollient is selected from at least one of alcohols, silicone oils, mineral oils, synthetic oils, animal and vegetable oils or their derivatives;

[0073] The vegetable and animal oils or their derivatives are selected from at least one of glycerol, propylene glycol, dipropylene glycol, pentane glycol, butylene glycol, ethylene glycol, hexanediol, sorbitol, xylitol, polyethylene glycol, polydimethylsiloxane, octyl polymethylsiloxane, phenyl polytrimethylsiloxane, cetyl polydimethylsiloxane, C30-45 alkyl dimethylsilyl polypropylene silsesquioxane, bis-PEG-18 methyl ether dimethylsiloxane, white mineral oil, petrolatum, hydrogenated polyisobutylene, lanolin and its derivatives, octyl dodecanol, caprylic / capric triglyceride, ethylhexyl palmitate, bis-diglycerol polyacryl adipate-2, isononyl isononanoate, jojoba seed oil, coconut oil, hydrogenated coconut oil glycerides, meadowfoam seed oil, olive oil, squalane, C9-12 alkyl, coconut oil alcohol-caprylate / capric ester, tocopheryl acetate, and methyl glucetol polyether-10.

[0074] In some embodiments, the filler is selected from at least one of mica, talc, synthetic fluorophlogopite, kaolin, bentonite, boron nitride, bismuth oxychloride, silica, potassium sodium aluminum silicate, lauroyl lysine, magnesium stearate, magnesium myristate, calcium aluminum borosilicate, tin oxide, calcium sodium borosilicate, aluminum hydroxide, zinc stearate starch and its derivatives, and plastic microbeads.

[0075] In some embodiments, the colorant is selected from at least one of iron oxide (Cl 77499, Cl 77491, Cl 77492), titanium dioxide (Cl 77891), iron blue (Cl 77510), ultramarine (Cl 77007), manganese violet (Cl 77742), chromium oxide green (Cl 77288), chromium hydroxide green, carmine (Cl 75470), carbon black (Cl 77266), Cl 15850, Cl 19140, Cl 45410, Cl 16035, Cl 45380, Cl 17200, Cl 73360, Cl 42090, and Cl 47005.

[0076] In some embodiments, the preservative is selected from at least one of phenoxyethanol, parabens, chlorphenesin, potassium sorbate, sodium benzoate, or preservative synergists.

[0077] The preservative synergist is selected from at least one of caprylyl glycol, p-hydroxyacetophenone, ethylhexylglycerin, 1,2-hexanediol, capryloyl hydroxamic acid, 1,2-pentanediol, glyceryl caprylate, and cymene.

[0078] Makeup powder blocks with a stippling effect

[0079] Secondly, embodiments of this application provide a cosmetic powder block with a dotting effect, prepared by any of the methods described above; optionally, the powder cosmetic is selected from pressed powder, blush, eyeshadow or highlighter.

[0080] The cosmetic powder block prepared in this embodiment has a good dotting effect, the edge of the dotting area is clear, the powder block is not easy to crack, and it has good drop resistance.

[0081] In some embodiments, the powder compact with a stippling effect is selected from pressed powder, blush, eyeshadow, or highlighter. Powder cosmetics with a stippling effect may also include products with other functions.

[0082] Example

[0083] The following embodiments describe the disclosure of this application in more detail. These embodiments are for illustrative purposes only, as various modifications and variations will be apparent to those skilled in the art within the scope of the disclosure of this application. Unless otherwise stated, all parts, percentages, and ratios reported in the following embodiments are based on mass, and all reagents used in the embodiments are commercially available or synthesized by conventional methods and can be used directly without further processing, and the instruments used in the embodiments are commercially available.

[0084] Example 1

[0085] (1) Preparation of powder block base material: The following raw materials are used: Phase A: water; Phase B: glycerol, carrageenan; Phase C: potassium chloride; Phase D: polysorbate-60, cetyl ethyl acetate, squalane, octyl dodecyl stearyl oxystearate, tocopheryl acetate; Phase E: silica; synthetic fluorophlogopite; Phase F: pigment; Phase G: chlorophenoxyethanol, octyl glycol. Phase B is first compounded and pre-dissolved; after heating Phase A, Phase B, Phase C, and Phase D are added to Phase A and emulsified and homogenized; Phase E and Phase F are mixed and stirred, and finally Phase G is added and emulsified and homogenized together. The emulsified and homogenized material is degassed under vacuum to obtain powder block base material. The powder block base material has good fluidity under 25℃ and normal pressure conditions.

[0086] (2) Preparation of dot dye body: Prepare dot dye base. The composition of the dot dye base in this embodiment is the same as that of the powder base, and the preparation steps are also the same. Therefore, it can be prepared separately, or a portion can be taken from the powder base prepared in step (1). The two water-insoluble coloring materials used in this embodiment are: color powder 1 - trade name UNIPURE BLUE LC680 (INCI: CI77007) and color powder 2 - trade name PRIMROSE-YELLOW (INCI: CI77492). Mix the dot dye base with the above two water-insoluble color powders respectively to obtain the dot dye base.

[0087] (3) Dotting: Provide a silicone mold with an upward-opening chamber and a floral relief three-dimensional pattern at the bottom of the chamber; according to the pre-designed dotting, dot the two powder base materials at several preset positions at the bottom of the chamber of the silicone mold.

[0088] (4) Filling: Heat the powder base material to 60°C and fill it into the mold after dotting by gravity filling with a filling machine according to the preset amount.

[0089] (5) Freezing and demolding: The mold containing the mixture is placed in a freezer at -15°C to freeze it, and then the powder masterbatch is separated from the mold.

[0090] (6) Freeze-drying: The demolded powder masterbatch is freeze-dried to obtain a cosmetic powder block with a dotting effect. Freeze-drying includes pre-freezing, sublimation drying, and desorption drying. Pre-freezing is carried out at -50 to -40°C for 0.3 to 0.5 hours. Sublimation drying includes heating the powder masterbatch to -3°C to 3°C, the heating process including several first heating stages and several first holding stages, with the first heating stages and first holding stages alternating. Desorption drying includes drying the cured powder masterbatch at 20°C to 60°C, the drying process including several second heating stages and several second holding stages, with the second heating stages and second holding stages alternating.

[0091] Example 2

[0092] The difference between Example 2 and Example 1 is that the water-insoluble coloring material used is different.

[0093] Examples 3-5

[0094] The difference between Examples 3-5 and Example 1 is that the viscosity of the powder base material and the dot dye body are different.

[0095] Examples 6-7

[0096] The difference between Examples 6-7 and Example 1 is that, instead of heating the material before filling, the material is filled into the mold after the water-insoluble coloring material has been applied using a pneumatic feeding device at room temperature. Specifically, the material is pressed into the mold by air pressure. In Examples 6 and 7, the pressure in the pneumatic feeding device is 0.02 MPa and 0.06 MPa, respectively.

[0097] Examples 8-9

[0098] The difference between Examples 8-9 and Example 1 is that the freezing step of the mixture within the mold is performed in a liquid nitrogen tunnel. The powder masterbatch passes through the liquid nitrogen tunnel on a conveyor belt at a speed of 0.6 m / min, and the transit time within the liquid nitrogen tunnel is 10 minutes. In Examples 8 and 9, the temperatures within the liquid nitrogen tunnel are -80°C and -95°C, respectively.

[0099] Example 10

[0100] The difference between Example 10 and Example 1 is that the material is pressed into the mold by air pressure, and the pressure in the air pressure feeding device is 0.04 MPa; and the step of freezing the mixture in the mold is carried out in a liquid nitrogen tunnel, where the temperature is -85°C.

[0101] Comparative Examples 1-4

[0102] The difference between Comparative Example 1 and Example 1 is that the drying step (6) was not freeze-dried, but dried at 55°C.

[0103] The difference between Comparative Example 2 and Example 1 is that the drying step (6) was not freeze-dried, but dried at 40°C.

[0104] The difference between Comparative Example 3 and Example 1 is that the viscosity of the powder base material and the dye body at room temperature and pressure reaches about 8000 cP, resulting in poor fluidity.

[0105] The difference between Comparative Example 4 and Example 1 is that the viscosity of the powder base and the dye body reaches about 8000 cP at room temperature and pressure, resulting in poor flowability. During the preparation process, room temperature pressure filling was used, and liquid nitrogen tunnel cryogenic freezing was performed before demolding.

[0106] The raw materials and preparation process parameters of Examples 1-10 and Comparative Examples 1-4 are shown in Table 1.

[0107] Table 1. Process parameters for Examples 1-10 and Comparative Examples 1-4

[0108] Test section

[0109] Powder compacts were prepared according to the methods of Examples 1-10 and Comparative Examples 1-4. 100 powder compacts were prepared for each example or comparative example, and their appearance and drop tests were performed.

[0110] 1) Visual inspection

[0111] Observe the appearance of the powder compact with the naked eye or with the aid of a microscope, including the appearance of the shading effect. Pay special attention to the shading effect of the powder compact, including whether the edges of the shading area are clear, whether there is any color loss, whether there are air bubbles at the sharp points of the fine embossed surface, and whether the powder block is cracked.

[0112] The appearance of the powder compacts was based on observations of more than 90% of the 100 compacts. The percentage of powder compacts with minor cracks was the percentage of powder compacts with minor cracks out of 100 compacts.

[0113] 2) Drop detection

[0114] Adjust the drop test platform rotation screws to adjust the plate to the 30cm mark; place the powder block face up in the center of the test height.

[0115] The first drop test is performed: Press the test platform button to drop the powder block onto a hard plate. Pick up the powder block after it has fallen onto the platform and check its surface for cracks or breaks. If the powder block is cracked or broken, stop the drop test for that powder block. If the powder block shows no abnormalities, proceed to the second drop test. The procedure for the second drop test is the same as the first drop test. If the powder block is cracked or broken, stop the drop test for that powder block. If the powder block shows no abnormalities, proceed to the third drop test. The procedure for the third drop test is the same as the first drop test.

[0116] The breakage rate for each drop test is the ratio of the number of broken powder compacts to the total number of powder compacts tested in that test. The first, second, and third breakage rates for Examples 1-10 and Comparative Examples 1-4 are recorded respectively. The drop resistance is scored based on the sum of the three breakage rates. The scoring rules for drop resistance are as follows:

[0117] Table 2. Drop Test Scoring Rules

[0118] The test results of Examples 1-10 and Comparative Examples 1-4 are recorded in Table 3.

[0119] Table 3. Detection results of Examples 1-10 and Comparative Examples 1-4

[0120] As shown in Table 3, the test results of Examples 1-10, which use the preparation method of cosmetic powder blocks with dotting effect provided in this application, after preparing the powder block base material and dotting dye body, are dotting, filling, freezing demolding and freeze drying. The prepared cosmetic powder blocks have better dotting effect, improved edge clarity of the dotting area, better filling of fine grinding surface and reduced cracking and breakage of powder blocks compared with the cosmetic powder blocks of Comparative Examples 1-4 that do not use the preparation method of this application.

[0121] In Examples 1-10, Examples 1-5 used a dotting dye body containing water-insoluble coloring material for dotting. By controlling the good flowability of the powder base material and the dotting dye body at room temperature and pressure, the interfacial compatibility between the dotting dye body and the powder base material was improved. Simultaneously, a freeze-drying process was used to dry the powder, further reducing potential shrinkage differences between different materials during drying. This resulted in a lower cracking rate and significantly improved drop resistance of the prepared cosmetic powder. Furthermore, the freeze-drying process ensured that the color of the powder did not easily migrate or be lost during drying, making the dotting color of the prepared cosmetic powder easier to control and resulting in clearer edges in the dotting area. The product effect of Example 1 is shown in Figure 1.

[0122] Examples 6 and 7 further improved the filling method based on Examples 1 to 5, using a pneumatic feeding device for material filling. Compared with the heated filling method of Examples 1 to 5, the edges of the dotted areas are clearer, the fine embossed surface is filled more perfectly, no bubbles are generated in the sharp parts, and due to the auxiliary effect of air pressure on material filling, the rate of micro-cracking and drop breakage during the powder preparation process is further reduced.

[0123] Examples 8-9 further improved the freezing method before demolding based on Examples 1-5. Before demolding, the mixture was pre-frozen at ultra-low temperatures using a liquid nitrogen tunnel. Compared to Examples 1-5 which used ordinary freezing methods, the ultra-low temperature freezing using a liquid nitrogen tunnel allows fine, uniformly distributed ice crystals to form inside the mixture in a very short time. After the fine, uniformly distributed ice crystals are directly sublimated into water vapor and removed through a freeze-drying step, the drop resistance of the prepared powder is further improved.

[0124] Example 10, based on Examples 1-5, uses a pneumatic feeding device for material filling and a liquid nitrogen tunnel for ultra-low temperature pre-freezing of the mixed material before demolding. As a result, the edges of the dotted areas are very clear, there is no color loss during the drying process, the cracking rate of the cosmetic powder blocks is reduced to below 2%, and the drop resistance score reaches 5 points.

[0125] Comparative Examples 1 and 2 did not use freeze drying, but instead used oven drying at 55℃ and 40℃ respectively. The edges of the dotted areas were not clear, there was color loss before and after drying, and fine cracks appeared between the dotted areas and the powder matrix during the drying process, resulting in low drop resistance scores.

[0126] The powder matrix and dye body of Comparative Examples 3 and 4 reached a viscosity of 8000 cP at room temperature and pressure, resulting in poor fluidity at room temperature and pressure. During the filling process, both materials tended to solidify and could not be mixed well, resulting in poor interfacial compatibility. During the drying process, micro-cracks easily appeared between the powder matrix and the dye area, and the drop resistance of the prepared cosmetic powder blocks was also poor. Even if room temperature air pressure filling was used during the preparation process and liquid nitrogen tunnel ultra-low temperature freezing was performed before demolding, it could not significantly improve the drop resistance of the cosmetic powder blocks.

[0127] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for producing a cosmetic powder compact having a dotting effect, wherein, The method comprises the following steps: preparing a base material of the powder block: mixing raw materials for preparing the cosmetic powder block to obtain the base material of the powder block; preparing a dot dye body: preparing at least one dot dye base material, mixing the dot dye base material with at least one water-insoluble coloring material to obtain at least one dot dye body; the water-insoluble coloring material is selected from water-insoluble toner or lake; dotting: providing a mold, the mold having at least one upwardly open cavity, and dotting the at least one dot dye body at at least one preset position on the bottom of the cavity, respectively; filling: filling the base material of the powder block into the mold after dotting in a preset amount to obtain a mixed body; freezing and demolding: freezing the mixed body in the mold to obtain a powder master product, and then separating the powder master product from the mold; freeze-drying: freeze-drying the demolded powder master product to obtain a cosmetic powder block with a dot dye effect; wherein the base material of the powder block and the dot dye body have fluidity at normal temperature and pressure.

2. The method for producing a cosmetic puff having a dotting effect according to claim 1, wherein The viscosity of the base material of the powder block and the dot dye body at 25°C is below 6000 cP; preferably, the viscosity of the base material of the powder block and the dot dye body at 25°C is 2500 cP-5000 cP.

3. The method for producing a cosmetic puff having a dotting effect according to claim 1, wherein The base material of the powder block and the dot dye base material are composed of the same or different components; preferably, the base material of the powder block and the dot dye base material are composed of the same components.

4. The method for producing a cosmetic puff having a dotting effect according to claim 1, wherein The step of filling the base material of the powder block into the mold after dotting in a preset amount comprises: at normal temperature, filling the base material of the powder block into the mold after dotting in a preset amount via a pneumatic feeding device.

5. The method for producing a cosmetic puff having a dotting effect according to claim 4, wherein The pressure in the pneumatic feeding device is 0.01-0.06 MPa, preferably 0.02-0.04 MPa.

6. The method for producing a cosmetic puff having a dotting effect according to claim 1, wherein The step of freezing the mixed body in the mold is performed in a liquid nitrogen quick-freezing device, and the temperature inside the liquid nitrogen quick-freezing device is -120 to -70°C, preferably -95 to -80°C.

7. The method for producing a cosmetic puff having a dotting effect according to claim 1, wherein The freeze-drying comprises pre-freezing, sublimation drying and desorption drying.

8. The method for producing a cosmetic puff having a dotting effect according to claim 1, wherein The mold is made of TPR, TPE, silica gel, silicone rubber, rubber or metal; the bottom of the cavity of the mold has or does not have a three-dimensional pattern.

9. The method for producing a cosmetic puff having a dotting effect according to claim 1, wherein The raw materials for preparing the cosmetic powder block comprise a powder phase component, an oil phase component and a water phase component, and the raw materials form an oil-in-water emulsion system.

10. A cosmetic puff having a dotting effect, wherein, Obtained by the method of any one of claims 1-9.

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