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

Abstract

The present application provides a method for preparing a cosmetic powder block with a dotting effect and a cosmetic powder block. The preparation method includes: preparing a powder block base material; preparing a dotting base material, mixing the dotting base material with a water-insoluble coloring material to obtain a dotting body; dotting the dotting body at a preset position at the bottom of a mold cavity; filling the powder block base material into the mold after dotting according to a preset amount; freezing and demolding the mixed material body in the mold; freeze-drying the demolded powder masterbatch to obtain a cosmetic powder block with a dotting effect; wherein the powder block base material and the dotting body have fluidity at room temperature and pressure. The cosmetic powder block prepared according to the method of the present application can achieve the dotting effect in traditional Chinese fine brushwork, and the edges of the dotting area are clear. The powder block will not undergo fine cracking during the preparation process, and the powder block has good drop resistance.

Description

Technical Field

[0001] The present application belongs to the technical field of daily cosmetics, and specifically relates to a preparation method of a cosmetic powder block with a dotting effect and a cosmetic powder block. Background Art

[0002] Powder cosmetics can modify facial features and increase the luster of makeup. For example, highlighter powder can brighten local areas, enhance facial contours, make the base makeup more radiant, say goodbye to dullness, and create a visual contrast between light and shadow, thereby increasing the three-dimensional sense of facial features.

[0003] On the one hand, the functional requirements of cosmetic powder compacts necessitate the development of multi-color, blendable powder compacts. On the other hand, as the cosmetics industry has evolved, developers are increasingly prioritizing the emotional value that cosmetics provide to users. This emotional value primarily manifests in stimulating positive emotions through the product's visual, tactile, and olfactory qualities, thereby influencing the user's psychological state and overall skincare and cosmetic results. Therefore, the appearance and blending properties of multi-color, blendable powder compacts are also highly valued. However, traditional cosmetic powder compacts currently on the market are relatively monotonous in appearance, and the patterns and styles of the compacts remain to be developed. Summary of the Invention

[0004] In view of this, the present application provides a method for preparing a cosmetic powder block with a dotting effect and a cosmetic powder block, so that the prepared cosmetic powder block not only has the dotting effect in traditional Chinese fine brushwork, but also has good anti-drop properties.

[0005] In a first aspect, an embodiment of the present application provides a method for preparing a cosmetic powder block with a dotting effect, comprising the following steps: preparing a powder block base: mixing raw materials for preparing a cosmetic powder block to obtain a powder block base; preparing a dotting dye body: preparing at least one dotting dye base, mixing the dotting dye base 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 color powder or color lake; dotting: providing a mold, the mold having at least one upwardly open cavity, and dotting at least one dotting dye body at at least one preset position at the bottom of the cavity; filling: filling the powder block base into the dot-coated mold according to a preset amount to obtain a mixed body; freeze 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 dotting effect; wherein, the powder block base and the dotting dye body have fluidity at room temperature and pressure.

[0006] According to an embodiment of the first aspect of the present application, the viscosity of the powder block base material and the dot dye body at 25°C is below 6000cP; preferably, the viscosity of the powder block base material and the dot dye body at 25°C is 2500cP to 5000cP.

[0007] According to an embodiment of the first aspect of the present application, the powder block base material and the dot dyeing base material are composed of the same or different components; preferably, the powder block base material and the dot dyeing base material are composed of the same components.

[0008] According to an embodiment of the first aspect of the present application, the step of filling a preset amount of powder block base material into the mold after dot coating includes: at room temperature, filling a preset amount of powder block base material into the mold after dot coating via an air pressure feeding device.

[0009] According to an embodiment of the first aspect of the present application, the pressure in the pneumatic feeding device is: 0.01~0.06MPa, preferably 0.02~0.04MPa.

[0010] According to an embodiment of the first aspect of the present application, the step of freezing the mixed material body in the mold is carried out 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.

[0011] According to an embodiment of the first aspect of the present application, freeze drying includes pre-freezing, sublimation drying and desorption drying.

[0012] According to an embodiment of the first aspect of the present application, the mold is made of TPR, TPE, silicone, silicone rubber, rubber or metal; the bottom of the cavity of the mold has or does not have a three-dimensional pattern.

[0013] According to an embodiment of the first aspect of the present application, the raw materials used to prepare the cosmetic powder block include a powder phase component, an oil phase component and a water phase component, and the raw materials form an oil-in-water emulsion system.

[0014] In a second aspect, an embodiment of the present application provides a cosmetic powder block with a dotting effect, characterized in that it is prepared by any of the above methods; optionally, the cosmetic powder block is selected from pressed powder, blush, eye shadow or highlighter.

[0015] Compared with the prior art, this application has at least the following beneficial effects:

[0016] In the method provided in the present application, water-insoluble coloring materials are very cleverly used in combination with a freeze-drying process to achieve the dotting effect in traditional Chinese fine brushwork on the surface of the cosmetic powder block. Specifically, the dotting color is provided by water-insoluble color powder or color lake, which is mixed with the dotting base material and then dotted into the mold. Then, the powder block base material is filled. Because the powder block base material and the dotting dye body have good fluidity at room temperature and pressure, they can achieve good mutual mixing on the contact surface of the material body. At the same time, the water-insoluble coloring material is not easy to diffuse in the mixed material body, thereby forming a localized, irregular fixed-point dyeing effect on the surface and inside of the cosmetic powder block contacting the bottom of the mold cavity. Then, the freeze demolding and freeze drying steps are performed to further reduce the cracking rate of the powder block and improve the drop resistance of the powder block, ultimately obtaining the cosmetic powder block with dotting effect of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which the same or similar reference numerals represent the same or similar features.

[0018] Figure 1 This is a product schematic diagram of Example 1 provided in this application. DETAILED DESCRIPTION

[0019] In order to make the application purpose, technical solution and beneficial technical effects of this application clearer, the application is further described in detail below with reference to the embodiments. It should be understood that the embodiments described in this specification are only for explaining this application and are not intended to limit this application.

[0020] For simplicity, this application only explicitly discloses certain numerical ranges. However, any lower limit may be combined with any upper limit to form an unspecified range; and any lower limit may be combined with other lower limits to form an unspecified range, and similarly, any upper limit may be combined with any other upper limit to form an unspecified range. In addition, although not explicitly stated, each point or individual value between the endpoints of a range is included in the range. Thus, each point or individual value may serve as its own lower limit or upper limit and be combined with any other point or individual value, or with other lower limits or upper limits, to form an unspecified range.

[0021] In the description of this application, it should be noted that, unless otherwise specified, “above” and “below” are inclusive of the number, and “a variety” in “one or more” means two or more.

[0022] The above disclosure of the present application is not intended to describe every disclosed embodiment or every implementation in the present application. The following description more specifically illustrates exemplary embodiments. In many places throughout the application, guidance is provided through a series of examples, which can be used in various combinations. In each example, the enumeration is intended only as a representative group and should not be construed as exhaustive.

[0023] Dotting and dyeing is a key technique in traditional Chinese fine brushwork, particularly in freehand flower painting. It involves applying ink or color directly to a brush. This technique is characterized by the idea being in the mind before the brush is applied, and the painting is completed in one go, creating irregular, fixed dyeing effects in specific areas of the painting.

[0024] The inventors of this application hope to achieve the dotting effect of fine brushwork on the surface of cosmetic powder. However, if the surface of a prepared cosmetic powder block or a substantially formed powder block mother product is decorated by inkjet printing or dripping and dipping colorants, the results obtained are unsatisfactory. For example, inkjet printing can only form a very thin layer of surface decoration on the surface of the powder block, and the surface decoration disappears after a slight wipe or use. The method of dripping and dipping colorants does not allow the colorant to easily penetrate the surface of the powder block, and also faces the problem of the surface decoration disappearing after a slight wipe or use. If the amount of colorant is increased, the colorant will undergo uncontrollable peripheral diffusion, resulting in unclear edges of the colored area, and may also cause the powder block surface to be uneven, the colored area to crack, or partially fall off.

[0025] In view of the above problems, the present application provides a method for preparing a cosmetic powder block with a dotting effect, which can produce a cosmetic powder block with a dotting effect. The dotting area of the powder block has clear edges, is not prone to cracking, and has good drop resistance.

[0026] Preparation method of cosmetic powder block with dotting effect

[0027] In a first aspect, an embodiment of the present application provides a method for preparing a cosmetic powder block with a dotting effect, comprising the following steps: preparing a powder block base: mixing raw materials for preparing a cosmetic powder block to obtain a powder block base; preparing a dotting dye body: preparing at least one dotting dye base, mixing the dotting dye base 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 color powder or color lake; dotting: providing a mold, the mold having at least one upwardly open cavity, and dotting at least one dotting dye body at at least one preset position at the bottom of the cavity; filling: filling the powder block base into the dot-coated mold according to a preset amount to obtain a mixed body; freeze 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 dotting effect; wherein, the powder block base and the dotting dye body have fluidity at room temperature and pressure.

[0028] Since water-insoluble coloring materials are used in the dot dye body in the embodiment of the present application, migration and diffusion of the pigment are not easy to occur in the material body, thereby forming a localized, irregular fixed-point dyeing effect on the surface and interior of the cosmetic powder block that contacts the bottom of the mold cavity; the surface of the cosmetic powder block that contacts the bottom of the mold cavity is the user-facing surface.

[0029] The present invention does not limit the specific type of water-insoluble toner; it can be selected as needed. In some embodiments, the water-insoluble toner is selected from one or more of the following inorganic toners with CI numbers: CI77492, CI77491, CI77499, CI77891, CI77742, CI77007, CI77288, CI77289, and CI77510; or the water-insoluble toner is selected from one or more of the following organic toners with CI numbers: CI77266 and CI15850.

[0030] The present application does not limit the specific type of color lake; it can be selected as needed. In some embodiments, the color lake is selected from one or more of the following CI numbers: CI15850, CI45380, CI45410, CI73360, CI17200, CI16035, CI42090, CI19140, CI15985, and CI47005. Color lakes not only maintain a granular form and insolubility in most solvents, ensuring that the colorant does not undergo significant pigment migration and diffusion within the material, but also possess vibrant color, high tinting strength, and good light fastness, resulting in vibrant, stable, and long-lasting point-dyed colors.

[0031] In the present application, the powder block base material and the dot dye body must satisfy the requirement of having fluidity at room temperature and pressure. Wherein, the normal temperature condition refers to a temperature environment of 20 to 30°C, and the normal pressure refers to the air pressure felt in daily life or the workplace, which is usually 1013.25 millibars (mb) or 760 millimeters of mercury (mmHg). In the implementation process of the present application, the interfacial compatibility between the dot dye body and the powder block base material is an important factor affecting the quality of the powder block. If the powder block base material is filled into the mold after dot coating or during the filling process, the powder block base material or the dot dye body has tended to solidify, then there is a high probability of poor compatibility between the two materials after filling, resulting in an increased possibility of cracking of the powder block. In the present application, by controlling the fluidity of the powder block base material and the dot dye body at room temperature and pressure, it is ensured that the contact interface of the powder block base material and the dot dye body forms a good mutual mixing during the filling process, thereby improving the interfacial compatibility and reducing the cracking of the powder block.

[0032] Furthermore, during the drying and dehydration process of the powder block, if conventional heating or other methods are used to dry the powder block, the different material compositions of the dotted dye body and the powder block base material may result in different shrinkage rates during the heat drying process, which can also lead to cracking between the dotted dye area and the powder block base material and poor drop resistance. Furthermore, during the drying process, the evaporation of water is often inevitably accompanied by local migration of the pigment, resulting in unclear edges of the dotted dye area. Therefore, the present application uses freeze-drying to dry the powder block. Freeze-drying is a drying method that freezes a water-containing material below freezing point, converting the water into ice, and then converting the ice into vapor under a high vacuum for removal. Compared to drying methods such as baking, freeze-drying can maintain the stability of the material structure and reduce material shrinkage, thereby improving the problems of cracking between the dotted dye area and the powder block base material and poor drop resistance. Furthermore, freeze-drying can maximize the preservation of the color of the raw material. The color of the dotted dye area is less likely to migrate or lose during the drying process, and the boundaries of the dotted dye area are relatively clear.

[0033] Specifically, in the mixing step, the raw materials for preparing the cosmetic powder compact with a dotting effect can be purchased commercially or homemade. It is understood that the raw materials for preparing the cosmetic powder compact with a dotting effect generally include a powder phase component, an oil phase component, and an aqueous phase component. The raw materials can be mixed in steps using various methods commonly used in the prior art, such as mechanical stirring, and 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 the present application is not limited thereto.

[0034] In the embodiment of the present application, when preparing the water-insoluble coloring material, the same water-insoluble coloring material may be selected, or two or more water-insoluble coloring materials may be selected.

[0035] The powder block base material in the embodiment of the present application may include other colorants of a color different from the coloring material of the dotted area, or may not include colorants, depending on the desired color of the powder block base material outside the dotted area.

[0036] In the embodiment of the present application, the specific location of the preset position is not limited and can be selected according to the design. For example, the preset position is at a position with a three-dimensional pattern at the bottom of the chamber.

[0037] In the filling step of the embodiment of the present application, the preset amount can be set according to the volume of the powder cosmetics, the mold capacity or the filling needs, and the preset amount of each filling can be the same or different.

[0038] The preparation method provided in the embodiments of the present application can achieve mass production and high production efficiency.

[0039] In summary, in the method provided by the present application, water-insoluble coloring materials are extremely cleverly used in combination with a freeze-drying process to achieve the dotting effect in traditional Chinese fine brushwork on the surface of the cosmetic powder block. Specifically, the dotting color is provided by water-insoluble color powder or color lake, which is mixed with the dotting base material and then dotted in the mold, and then the powder block base material is filled. Since the powder block base material and the dotting body have good fluidity at room temperature and pressure, they can be well mixed on the contact surface of the material body. At the same time, the water-insoluble coloring material is not easy to diffuse in the mixed material body, thereby forming a localized, irregular fixed-point dyeing effect on the surface and inside of the cosmetic powder block contacting the bottom of the mold cavity. Then, the freeze demoulding and freeze drying steps are performed to further reduce the cracking rate of the powder block and improve the drop resistance of the powder block, and finally obtain the cosmetic powder block with dotting effect of the present application.

[0040] In some embodiments, the viscosity of the powder block base and the dotted dye body at 25°C is less than 6000 cP. In other embodiments, the viscosity of the powder block base and the dotted dye body at 25°C is between 2500 cP and 5000 cP, so that the dotted dye body and the powder block base have good interfacial compatibility at room temperature and pressure, and both the powder block base and the dotted dye body have good fluidity during the dot coating and filling process. During the filling process, the materials at the two interfaces are well mixed, thereby reducing cracking of the powder block.

[0041] Illustratively, the viscosity of the powder block base at 25° C. may be 6000 cP, 5000 cP, 4500 cP, 4000 cP, 3500 cP, 3000 cP, 2500 cP, 2000 cP, 1500 cP, 1000 cP, or a range consisting of any two of the above values.

[0042] For example, the viscosity of the dotted dye at 25° C. may be 6000 cP, 5000 cP, 4500 cP, 4000 cP, 3500 cP, 3000 cP, 2500 cP, 2000 cP, 1500 cP, 1000 cP, or a range consisting of any two of the above values.

[0043] In some embodiments, the powder block base material and the dye base material may be composed of the same components or different components. When the powder block base material and the dye base material have the same components, the interfacial compatibility between the powder block base material and the dye base material is better, which helps to reduce cracking of the powder block.

[0044] In some embodiments, the step of filling a preset amount of powder block base material into the mold after dotting includes: at room temperature, filling a preset amount of powder block base material into the mold after dotting via an air pressure feeding device.

[0045] Conventional material filling is carried out under heating conditions, for example, the temperature of the material is kept between 40 and 80°C, so that the material in the heated state has better fluidity. However, for this application, a high temperature environment will increase the local transfer of pigments in the dyeing area, affecting the edge clarity of the dyeing area. Therefore, this application adopts filling under normal temperature conditions, which refers to 20°C to 30°C. For example, the filling is completed under temperature conditions of 20°C, 22°C, 24°C, 25°C, 26°C, 28°C, and 30°C.

[0046] In the embodiment of the present application, an air pressure feeding device is used for filling, and the powder block base material is quantitatively filled into the mold through the air pressure feeding device. The air pressure feeding assists the powder block base material in filling the mold, thereby avoiding the appearance of small bubbles at the sharp corners of the fine relief of the cosmetic powder block and making the cosmetic powder block more resistant to falling.

[0047] A pneumatic feeding device refers to a device that fills a material into a mold by pneumatic conveying. For example, the pneumatic feeding device may include an air pump and a pipeline connected to the air pump, wherein the air pump is used to provide the air pressure required for conveying, and the pipeline is used to fill the material into the mold, but the present application is not limited thereto.

[0048] Specifically, the powder block base material can be pressed into the mold by the action of air pressure. For example, the air pressure feeding device includes a feed pipe, an air pump and a discharge pipe. The air pump provides conveying air pressure to suck the powder block base material from the feed pipe into the air pressure feeding device and then press it into the mold through the discharge pipe. The powder block base material can also be sucked into the mold by the action of air pressure. For example, the air pressure feeding device is connected to the mold, and the air pressure feeding device provides conveying air pressure to suck the powder block base material into the mold.

[0049] In some embodiments, the pressure in the pneumatic feeding device is 0.01-0.06 MPa, or 0.02-0.04 MPa. For example, 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.

[0050] In some embodiments, the step of solidifying the powdered product at low temperature is performed in a liquid nitrogen quick-freezing device. For example, the liquid nitrogen quick-freezing device can be a liquid nitrogen tunnel, a liquid nitrogen freezer, an ultra-low temperature refrigerator, etc. These devices are commercially available, and the present application is not limited thereto.

[0051] After the filling step is completed, the present application obtains a powder masterbatch that has been pre-cured and formed in a mold. Subsequently, the present application uses a liquid nitrogen quick-freezing device to perform ultra-low temperature solidification on the powder masterbatch. The raw material components in the powder masterbatch undergo molecular quick freezing in an ultra-low temperature environment in the liquid nitrogen quick-freezing device. The cosmetic material contains components such as oils and emulsions. During its freezing and shaping process, it will experience a maximum ice crystal formation zone, which is approximately in the temperature range of -10 to 0°C. About 80% of the liquid (water, emulsion, etc.) will turn into ice. Unlike the ordinary freezing performed before demolding in the prior art, the powder masterbatch in the molecular quick-freezing process completed in the liquid nitrogen tunnel in the present application quickly passes through the maximum ice crystal formation zone. The distribution of ice crystals in the powder masterbatch is smaller and more uniform. In the subsequent freeze-drying step, the small and uniform ice crystals are directly converted into vapor and removed, so that the anti-drop ability of the freeze-dried powder block is further improved.

[0052] 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 quick-freezer, is a device that uses liquid nitrogen as a cold source and adopts a continuous production method. The material is fed into the quick-freezing tunnel via a conveyor belt, achieving continuous entry and exit and rapid freezing of the material. For example, the powdered mother product passes through the liquid nitrogen tunnel on a conveyor belt in the liquid nitrogen tunnel at a speed of 0.4 to 1.2 meters per minute, and the powdered mother product passes through the liquid nitrogen tunnel for 6 to 10 minutes.

[0053] In some embodiments, freeze drying is performed in a freeze drying apparatus.

[0054] 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 can be carried out in the following steps: pre-freezing is carried out at -50 to -40°C, and the pre-freezing time is 0.3 to 0.5 hours; sublimation drying includes: heating the powdered masterbatch to -3°C to 3°C, and the heating treatment includes several first heating stages and several first heat preservation stages, and the first heating stage and the first heat preservation stage are alternately performed, and the first heating stage is heated at 0.5 to 1°C / min for 10 to 20 minutes, and the first heat preservation time is 1.5 to 2 hours; desorption drying includes: drying the solidified powdered masterbatch at 20°C to 60°C, and the drying treatment includes several second heating stages and several second heat preservation stages, and the second heating stage is alternately performed with the second heat preservation stage, and the second heating stage is heated at 0.5 to 1°C / min for 10 to 20 minutes, and the second heat preservation time is 1.5 to 2 hours. The freeze-drying process parameters can be adjusted in actual production and are not limited in this application.

[0055] Sublimation drying, as used herein, can be understood as a drying method in which the material to be dried is rapidly frozen and then the ice is removed by sublimating into water vapor under high vacuum conditions. Desorption drying, as used herein, can be understood as a drying method in which the material to be dried is placed under negative pressure or vacuum conditions and appropriately heated to its boiling point under negative pressure, or cooled to solidify the material and then dried by controlling its melting point. 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.

[0056] In some embodiments, the solvent content in the prepared cosmetic powder compact is less than 5%, preferably less than 1%.

[0057] In some embodiments, the mold is made of TPR, TPE, silicone, silicone rubber, rubber or metal; the bottom of the cavity of the mold has or does not have a three-dimensional pattern.

[0058] The preparation method in the embodiment of the present application can use the mold made of the above-mentioned TPR, TPE, silicone, silicone rubber, rubber or metal, and can prepare powder cosmetics with a dotting effect.

[0059] The bottom of the cavity of the selected mold can be flat and not have a three-dimensional pattern; or the bottom of the cavity of the mold can have a three-dimensional pattern, where the three-dimensional pattern can be diverse. For example, the three-dimensional pattern can be a flower, but the embodiments of the present application are not limited to this.

[0060] 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 toward the interior of the cosmetic powder block. The extension distance can be adjusted by controlling the amount of dotting dye used.

[0061] In some embodiments, the raw materials for preparing the cosmetic powder block include a powder phase component, an oil phase component, and a water phase component, and the raw materials form an oil-in-water emulsion system.

[0062] In some embodiments, the powder phase components include: one or more of a filler and a colorant;

[0063] The oil phase components include: one or more of: emollients, antioxidants, and sunscreens;

[0064] The aqueous phase components include: one or more of solvents, thickeners, film formers, moisturizers, emulsifiers, preservatives, and active ingredients.

[0065] In the embodiment of the present application, the raw materials form an oil-in-water emulsion system, and the oil-in-water emulsion system uses water as the continuous phase, which can make the water-soluble pigment flow better and the gradient effect more natural.

[0066] 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;

[0067] The natural water-soluble polymer or its derivative is selected from at least one of alginic acid, agar, carrageenan, xanthan gum, gellan gum, crisp chondrus crispus, xanthan gum, guar gum, tamarind gum, tara gum, gum arabic, tragacanth gum, tara gum, pectin, arabogalactan, wheat protein, soy protein, gelatin, casein, chitosan, curdlan, cyclodextrin, hyaluronic acid, konjac gum, tremella polysaccharide, codyl gum, microcrystalline cellulose, methylcellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, starch phosphate, starch, sodium hydroxymethyl starch, sodium polyacrylate grafted starch, and hydroxypropyl guar gum;

[0068] The synthetic water-based polymer is selected from at least one of acrylates / C10-30 alkyl acrylate crosspolymer, carbomer, acrylates / octylacrylamide copolymer, acrylates / ethylhexyl acrylate copolymer, sodium acrylate / sodium acryloyldimethyl taurate copolymer, acrylates / octylacrylamide copolymer, styrene / acrylates copolymer, acrylates copolymer, hydroxyethyl acrylate / sodium acryloyldimethyl taurate copolymer, polyacrylate crosspolymer-6, acrylates / stearyl ether-20 methacrylate copolymer, ammonium acryloyldimethyl taurate / beheneth-25 methacrylate crosspolymer, ammonium acrylates copolymer, sodium polyacrylate, sodium polyacryloyldimethyl taurate, polyacrylamide, polyvinyl pyrrolidone, polyvinyl alcohol, VP / VA copolymer, polyurethane-1, and polyurethane-35;

[0069] The aqueous inorganic thickener is selected from at least one of magnesium aluminum silicate, sodium magnesium lithium silicate, lithium magnesium silicate, sodium magnesium silicate, montmorillonite or their derivatives;

[0070] In some embodiments, the emollient is selected from at least one of alcohols, silicone oils, mineral oils, synthetic oils, animal and plant oils, or derivatives thereof;

[0071] The animal or plant oil or its derivative is selected from at least one of glycerin, propylene glycol, dipropylene glycol, pentylene glycol, butylene glycol, ethylene glycol, hexylene glycol, sorbitol, xylitol, polyethylene glycol, dimethicone, caprylyl methicone, phenyl trimethicone, cetyl dimethicone, C30-45 alkyldimethylsilyl polypropyl silsesquioxane, bis-PEG-18 methyl ether dimethyl silane, white mineral oil, petrolatum, hydrogenated polyisobutene, lanolin and its derivatives, octyldodecanol, caprylic / capric triglyceride, ethylhexyl palmitate, bis-diglyceryl polyacyl adipate-2, isononyl isononanoate, jojoba seed oil, coconut oil, hydrogenated coconut glycerides, meadowfoam seed oil, olive oil, squalane, C9-12 alkane, coconut alcohol-caprylate / caprate, tocopheryl acetate, and methyl gluceth-10;

[0072] In some embodiments, the filler is selected from at least one of mica, talc, synthetic fluorphlogopite, kaolin, bentonite, boron nitride, bismuth oxychloride, silica, sodium potassium 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.

[0073] In some embodiments, the colorant is selected from at least one of iron oxide (Cl 77499, Cl 77491, CI 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 (Cl75470), carbon black (Cl 77266), Cl 15850, Cl 19140, Cl 45410, Cl 16035, Cl 45380, Cl 17200, Cl 73360, Cl 42090, and Cl 47005.

[0074] In some embodiments, the preservative is selected from at least one of phenoxyethanol, parabens, chlorphenesin, potassium sorbate, sodium benzoate, or preservative enhancers.

[0075] The preservative synergist is selected from at least one of caprylyl glycol, p-hydroxyacetophenone, ethylhexylglycerin, 1,2-hexanediol, caprylhydroxamic acid, 1,2-pentanediol, glyceryl caprylate, and cymene.

[0076] Makeup powder block with dotting effect

[0077] In a second aspect, an embodiment of the present application provides a cosmetic powder block with a dotting effect, which is prepared by any of the above methods; optionally, the powder cosmetic is selected from pressed powder, blush, eye shadow or highlighter powder.

[0078] The cosmetic powder block prepared in the embodiment of the present application has a good dotting effect, the edge of the dotting area is clear, the powder block is not easy to crack, and has good drop resistance.

[0079] In some embodiments, the cosmetic powder block with a dotting effect is selected from pressed powder, blush, eye shadow, or highlighter powder. The powder cosmetics with a dotting effect may also include products with other functions.

[0080] Example

[0081] The following examples describe the present disclosure in more detail. These examples are intended for illustrative purposes only, as various modifications and variations within the scope of the present disclosure will be apparent to those skilled in the art. Unless otherwise stated, all parts, percentages, and ratios reported in the following examples are by mass, and all reagents used in the examples are commercially available or synthesized according to conventional methods and can be used directly without further processing. The instruments used in the examples are commercially available.

[0082] Example 1

[0083] (1) Preparation of powder block base: The following raw materials: Phase A: water; Phase B: glycerin, Chondrus crispus; Phase C: potassium chloride; Phase D: polysorbate 60, cetyl ethyl acetate, squalane, octyldodecyl stearoyl stearate, tocopheryl acetate; Phase E: silica; synthetic fluorphlogopite; Phase F: color powder; Phase G: chlorphenesin, caprylyl glycol. First, prepare phase B and pre-dissolve it; After heating phase A, add phase B, phase C, and phase D to phase A and emulsify and homogenize; Phase E and phase F are mixed and stirred, and finally phase G is added and emulsified and homogenized. The emulsified and homogenized material is vacuum degassed to obtain a powder block base. The powder block base has good fluidity at 25°C and normal pressure.

[0084] (2) Preparation of a dot-dye body: A dot-dye base is prepared. The dot-dye base of this embodiment has the same composition and preparation steps as the powder block base. Therefore, it can be prepared separately or a portion of the powder block base prepared in step (1) can be used. The two water-insoluble coloring materials used in this embodiment are: Toner 1, trade name UNIPURE BLUE LC680 (INCI: CI77007), and Toner 2, trade name PRIMROSE-YELLOW (INCI: CI77492). The dot-dye base is mixed with the two water-insoluble colorants to obtain a dot-dye base.

[0085] (3) Dot coating: A silicone mold is provided, wherein the silicone mold has an upwardly open cavity and a floral relief three-dimensional pattern at the bottom of the cavity; according to the pre-designed dot coating, two powder block base materials are dot coated at several preset positions at the bottom of the cavity of the silicone mold.

[0086] (4) Filling: Heat the powder base material to 60°C and fill it into the mold after dot coating according to the preset amount using a filling machine.

[0087] (5) Freezing demoulding: placing the mold filled with the mixed material in a freezer at -15°C to freeze the mixture to obtain a powdered product, and then separating the powdered product from the mold;

[0088] (6) Freeze drying: freeze-dry the powder masterbatch after demoulding 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, and the pre-freezing time is 0.3 to 0.5 hours; sublimation drying includes heating the powder masterbatch to -3°C to 3°C, and the heating treatment includes several first heating stages and several first heat preservation stages, and the first heating stages and the first heat preservation stages are performed alternately. Desorption drying includes drying the solidified powder masterbatch at 20°C to 60°C, and the drying treatment includes several second heating stages and several second heat preservation stages, and the second heating stages and the second heat preservation stages are performed alternately.

[0089] Example 2

[0090] The difference between Example 2 and Example 1 is that different water-insoluble coloring materials are used.

[0091] Examples 3-5

[0092] The difference between Examples 3-5 and Example 1 is that the viscosities of the powder block base material and the dot dye body are different.

[0093] Examples 6-7

[0094] Examples 6-7 differ from Example 1 in that, rather than heating the material before filling, the material is filled at room temperature into the mold, which has been dotted with a water-insoluble coloring material, using a pneumatic feeding device to a predetermined amount. Specifically, the material is pressed into the mold using air pressure. In Examples 6 and 7, the pressures in the pneumatic feeding device were 0.02 MPa and 0.06 MPa, respectively.

[0095] Examples 8-9

[0096] The difference between Examples 8-9 and Example 1 is that the step of freezing the mixture in the mold is performed in a liquid nitrogen tunnel. The powdered precursor product is conveyed through the liquid nitrogen tunnel on a conveyor belt at a speed of 0.6 m / min, and the powdered precursor product is transported through the liquid nitrogen tunnel for 10 minutes.

[0097] In Examples 8 and 9, the temperature in the liquid nitrogen tunnel was -80°C and -95°C.

[0098] Example 10

[0099] The difference between Example 10 and Example 1 is that the material body 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 mixed material body in the mold is carried out in a liquid nitrogen tunnel, and the temperature in the liquid nitrogen tunnel is -85°C.

[0100] Comparative Examples 1 to 4

[0101] The difference between Comparative Example 1 and Example 1 is that the drying step in step (6) does not adopt freeze drying, but adopts oven drying at 55°C.

[0102] The difference between Comparative Example 2 and Example 1 is that the drying step in step (6) does not adopt freeze drying, but adopts oven drying at 40°C.

[0103] The difference between Comparative Example 3 and Example 1 is that the viscosity of the powder block base material and the dotted dye body at room temperature and pressure reaches about 8000 cP, and the fluidity is poor.

[0104] The difference between Comparative Example 4 and Example 1 is that the viscosity of the powder block base material and the dotted dye body at room temperature and pressure is about 8000 cP, which is poor in fluidity. During the preparation process, air pressure filling is adopted at room temperature, and ultra-low temperature freezing is carried out in a liquid nitrogen tunnel before demolding.

[0105] The raw materials and preparation process parameters of Examples 1-10 and Comparative Examples 1-4 are shown in Table 1.

[0106] Table 1 Process parameters of Examples 1 to 10 and Comparative Examples 1 to 4

[0107]

[0108]

[0109] Test section

[0110] Pressed compacts were prepared according to the methods of Examples 1 to 10 and Comparative Examples 1 to 4, and 100 pressed compacts were prepared for each Example or Comparative Example, and the appearance was observed and the drop test was performed.

[0111] 1) Appearance observation

[0112] Observe the appearance of the pressed powder with the naked eye or under a microscope, including the appearance observation of the stippling effect, focusing on the stippling effect of the pressed powder, including whether the edges of the stippled area are clear, whether color loss occurs, whether there are bubbles at the sharp points of the fine embossed surface, and whether the powder block is cracked.

[0113] The recorded appearance is based on the observation results of more than 90% of the pressed powders in 100 pressed powders, and the percentage of powder cakes with fine cracks is the percentage of powder cakes with fine cracks in 100 pressed powders.

[0114] 2) Drop detection

[0115] Adjust the rotating screws on the drop test platform to adjust the flat plate to the 30cm scale; place the powder block with the front side facing up in the center of the test height.

[0116] Perform the first drop test: Press the test bench button to drop the powder block onto a hard surface. Pick up the fallen powder block and inspect its surface for cracks or breaks. If any are found, discontinue the drop test. If no abnormalities are detected, proceed to the second drop test. The procedure for this second drop test is the same as for the first. If any are found, discontinue the drop test. If no abnormalities are detected, proceed to the third drop test. The procedure for this third drop test is the same as for the first.

[0117] The ratio of the number of powder compacts that broke during each drop test to the total number of powder compacts tested in that drop test is the breakage rate for each drop test. The first, second, and third breakage rates for Examples 1-10 and Comparative Examples 1-4 are recorded separately. The drop resistance is scored based on the sum of the three breakage rates. The scoring rules for drop resistance are as follows:

[0118] Table 2 Drop test scoring rules

[0119] The sum of three rupture rates Less than 5% 5％～10％ 10％～15％ 15％～20％ 20％～25％ 25％～30％ Drop resistance rating 5 points 4 points 3 points 2 points 1 point 0 points

[0120] The above test results of Examples 1 to 10 and Comparative Examples 1 to 4 are recorded in Table 3.

[0121] Table 3 Test results of Examples 1 to 10 and Comparative Examples 1 to 4

[0122]

[0123]

[0124] It can be seen from the test results shown in Table 3 that Examples 1 to 10 adopt the preparation method of the cosmetic powder block with a dotting effect provided by the present application. After preparing the powder block base material and the dotting body, the prepared cosmetic powder blocks are dotted, filled, frozen and demolded, and freeze-dried. Compared with the cosmetic powder blocks of Comparative Examples 1 to 4 that do not adopt the preparation method of the present application, the prepared cosmetic powder blocks have better dotting effect, improved edge clarity of the dotting area, better filling of the finely carved and ground surface, and reduced cracking and falling breakage of the powder blocks.

[0125] In Examples 1 to 10, Examples 1 to 5 use a dot dye body containing a water-insoluble coloring material for dot dyeing. By controlling the powder block base material and the dot dye body to have good fluidity at room temperature and pressure, the dot dye body has fluidity at room temperature and pressure, thereby improving the interfacial compatibility between the dot dye body and the powder block base material. At the same time, a freeze-drying process is used to dry the powder block, further reducing the possible shrinkage rate differences between different materials during the drying process, thereby reducing the cracking rate of the prepared cosmetic powder block and significantly improving its drop resistance. In addition, the freeze-drying process also ensures that the color of the powder block is not easily migrated or lost during the drying process, making the dot dyeing color of the prepared cosmetic powder block easier to control and the edges of the dot dyeing area clearer. Please refer to the product effect of Example 1. Figure 1 .

[0126] Examples 6-7 further improved the filling method based on Examples 1-5, using a pneumatic feeding device to perform material filling. Compared to Examples 1-5, which used heated filling, the edges of the dotted areas were sharper, the fine relief milled surfaces were filled more perfectly, and no bubbles were generated in sharp areas. Furthermore, the air pressure-assisted filling further reduced the rate of fine cracking and drop breakage during powder block preparation.

[0127] Examples 8-9 further improve upon Examples 1-5 by using a liquid nitrogen tunnel to ultra-low-temperature pre-freeze the mixed material before demolding. Compared to Examples 1-5, which employed conventional freezing methods, ultra-low-temperature freezing in a liquid nitrogen tunnel allows for the formation of fine, evenly distributed ice crystals within the material within a very short period of time. These ice crystals are then directly sublimated into water vapor and removed during the freeze-drying step, further enhancing the drop resistance of the resulting powder block.

[0128] In Example 10, based on Examples 1 to 5, a pneumatic feeding device is used to implement material filling, and a liquid nitrogen tunnel is used to pre-freeze the mixed material at ultra-low temperature before demolding. Therefore, the edges of the dyeing area are very clear, there is no color loss during the drying process, the cracking rate of the cosmetic powder block is reduced to less than 2%, and the drop resistance score reaches 5 points.

[0129] The drying steps of Comparative Examples 1 and 2 did not use freeze drying, but instead used oven drying at 55°C and 40°C. The edges of the dotted areas were unclear, there was color loss before and after drying, and fine cracks appeared between the dotted areas and the powder block matrix during the drying process, resulting in a low drop resistance score.

[0130] The viscosity of the powder block base and dot dye body of Comparative Examples 3 and 4 reached 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 well mixed with each other, resulting in poor interfacial compatibility. During the drying process, fine cracks were easily generated between the powder block base and the dot dye area, and the drop resistance of the prepared cosmetic powder block was also poor. Even if room temperature air pressure filling was adopted during the preparation process and ultra-low temperature freezing in a liquid nitrogen tunnel was performed before demolding, the drop resistance of the cosmetic powder block could not be significantly improved.

[0131] The above description is merely a specific embodiment of the present application, but the scope of protection of the present 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 the present application, and such modifications or substitutions should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A method for preparing a cosmetic powder block with a dotting effect, characterized in that: The steps include: Preparing a powder block base: mixing raw materials for preparing a cosmetic powder block to prepare a powder block base; Preparing a dot-dye body: preparing at least one dot-dye base material, and 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 color powder or lake; Spot coating: providing a mold having at least one upwardly open cavity, and spot coating the at least one dot dye body on at least one preset position at the bottom of the cavity; Filling: Filling the powder block base material into the mold after dot coating according to a preset amount to obtain a mixed material body; Freezing demoulding: freezing the mixed material in the mold to obtain a powdered product, and then separating the powdered product from the mold; Freeze drying: freeze drying the powdered product after demoulding to obtain a cosmetic powder block with a dotting effect; Wherein, the powder block base material and the dotted dye body have fluidity at normal temperature and pressure; The viscosity of the powder block base material and the dot dye body at 25° C. is 2500 cP to 4500 cP.

2. The method for preparing a cosmetic powder block with a dotting effect according to claim 1, wherein: The powder block base material and the dot dyeing base material are composed of the same or different components.

3. The method for preparing a cosmetic powder block with a dotting effect according to claim 1, wherein: The powder block base material and the dot dyeing base material are composed of the same components.

4. The method for preparing a cosmetic powder block with a dotting effect according to claim 1, wherein: The step of filling the powder block base material into the dot-coated mold according to a preset amount includes: at room temperature, filling the powder block base material into the dot-coated mold according to a preset amount via an air pressure feeding device.

5. The method for preparing a cosmetic powder block with a dotting effect according to claim 4, wherein: The pressure in the pneumatic feeding device is 0.01~0.06MPa.

6. The method for preparing a cosmetic powder block with a dotting effect according to claim 5, characterized in that: The pressure in the pneumatic feeding device is 0.02-0.04 MPa.

7. The method for preparing a cosmetic powder block with a dotting effect according to claim 1, wherein: The step of freezing the mixed material in the mold is performed in a liquid nitrogen quick-freezing device, and the temperature inside the liquid nitrogen quick-freezing device is -120~-70°C.

8. The method for preparing a cosmetic powder block with a dotting effect according to claim 7, wherein: The temperature inside the liquid nitrogen quick-freezing device is -95~-80°C.

9. The method for preparing a cosmetic powder block with a dotting effect according to claim 1, wherein: The freeze drying includes pre-freezing, sublimation drying and desorption drying.

10. The method for preparing a cosmetic powder block with a dotting effect according to claim 1, characterized in that: The mold is made of TPR or TPE; the bottom of the cavity of the mold has or does not have a three-dimensional pattern.

11. The method for preparing a cosmetic powder block with a dotting effect according to claim 1, wherein: The mold is made of silicone; the bottom of the cavity of the mold has or does not have a three-dimensional pattern.

12. The method for preparing a cosmetic powder block with a dotting effect according to claim 1, wherein: The mold is made of silicone rubber; the bottom of the cavity of the mold has or does not have a three-dimensional pattern.

13. The method for preparing a cosmetic powder block with a dotting effect according to claim 1, characterized in that: The mold is made of rubber or metal; the bottom of the cavity of the mold has or does not have a three-dimensional pattern.

14. The method for preparing a cosmetic powder block with a dotting effect according to claim 1, characterized in that: The raw materials for preparing the cosmetic powder block include a powder phase component, an oil phase component and a water phase component, and the raw materials form an oil-in-water emulsion system.

15. A cosmetic powder block with a dotting effect, characterized in that: The method is prepared by any one of claims 1 to 14.

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