Preparation method of make-up powder block with spot dyeing effect and make-up powder block

Abstract

The invention provides a preparation method of a cosmetic powder block with a spot dyeing effect and the cosmetic powder block. The preparation method comprises the following steps: preparing a powder block base material: preparing a spot dyeing base material, and mixing the spot dyeing base material with a water-insoluble coloring material to obtain a spot dyeing body; dispensing the dot dye body at a preset position at the bottom of the mold cavity; filling the spot-coated mold with a powder block base material according to a preset amount; freezing and demolding the mixed material body in the mold; freeze-drying the demolded powder master product to obtain a cosmetic powder block with a spot dyeing effect; wherein the powder block base material and the dot dye body have flowability at normal temperature and normal pressure. The cosmetic powder block prepared according to the method can achieve the spot dyeing effect in traditional Chinese style paintings, the edge of a spot dyeing area is clear, the powder block cannot slightly crack in the preparation process, and the drop resistance of the powder block is good.

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 glossiness of makeup. For example, highlighter powder can brighten areas and enhance facial contours, making the base makeup more radiant and eliminating dullness. It can also create a visual contrast between light and shadow, thereby increasing the three-dimensional effect of the facial features.

[0003] On the one hand, starting from the functional requirements of cosmetic powder blocks, it is necessary to provide the development of multi-color mixed color powder blocks; on the other hand, as the cosmetics industry has developed to date, developers are paying more and more attention to the emotional value that cosmetics provide to users. The emotional value of cosmetics is mainly reflected in stimulating users' positive emotions through the visual, tactile, and smell aspects of cosmetic products, thereby affecting users' psychological state and skin care and beauty effects. Therefore, the appearance and color mixing effect of multi-color mixed color cosmetic powder block products are also valued. However, the appearance of traditional cosmetic powder block products on the market is relatively simple, and the patterns and styles of powder blocks need 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 cavity opening upward, 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 mold after dotting 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 the embodiment of the first aspect of the present application, the viscosity of the powder block base material and the dotted dye body at 25°C is below 6000cP; preferably, the viscosity of the powder block base material and the dotted 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 a pneumatic 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 to 0.06 MPa, preferably 0.02 to 0.04 MPa.

[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 analytical 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 freeze-drying technology to achieve the effect of dotting 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, 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 dye body have good fluidity at room temperature and pressure, good mutual mixing can be achieved on the contact surface of the material body, and the water-insoluble coloring material is not easy to diffuse in the mixed material body, so that a local, irregular fixed-point dyeing effect can be formed on the surface and inside of the cosmetic powder block contacting the bottom of the mold cavity, and 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objects and advantages of the present application will become more apparent by reading 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 effect of the present application clearer, the present application is further described in detail in conjunction with the embodiments below. It should be understood that the embodiments described in this specification are only for explaining the present application, not for limiting the present application.

[0020] For simplicity, this application only explicitly discloses some numerical ranges. However, any lower limit can be combined with any upper limit to form an unclearly recorded range; and any lower limit can be combined with other lower limits to form an unclearly recorded range, and any upper limit can be combined with any other upper limit to form an unclearly recorded range. In addition, although not clearly recorded, each point or single value between the range endpoints is included in the range. Thus, each point or single value can be combined with any other point or single value as its own lower limit or upper limit or with other lower limits or upper limits to form an unclearly recorded range.

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

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

[0023] Dotting and dyeing is one of the main techniques for freehand flower painting in traditional Chinese fine brushwork. It refers to the method of directly dotting and dyeing with a brush dipped in ink or color. The main feature of this method is that the idea comes before the brush, and the brush is formed and completed in one go, forming an irregular fixed-point dyeing effect in the part of the painting.

[0024] The inventor of the present application hopes to achieve the dotting effect of fine brushwork on the surface of cosmetic powder. However, if the surface of the prepared cosmetic powder block or the basically formed powder block master product is decorated by inkjet printing or dripping and dipping coloring materials, the obtained effect is not satisfactory. 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 slight wiping or use. The method of dripping and dipping coloring materials is that the coloring materials are not easy to penetrate on the surface of the powder block, and also faces the problem that the surface decoration disappears after slight wiping or use; if the amount of coloring materials is increased, the coloring materials will diffuse uncontrollably, resulting in unclear edges of the colored area, and may also cause the surface of the powder block 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 be used to prepare 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 cavity opening upward, 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 mold after dotting 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 local, 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 embodiments of the present application do not limit the specific types of water-insoluble color powders, and can be selected as needed. In some embodiments, the water-insoluble color powder is selected from one or more of the following inorganic color powders with CI numbers: CI77492, CI77491, CI77499, CI77891, CI77742, CI77007, CI77288, CI77289, CI77510; or the water-insoluble color powder is selected from one or more of the following organic color powders with CI numbers: CI77266, CI15850.

[0030] The specific types of color lakes are not limited in the embodiments of the present application, and can be selected as needed. In some embodiments, the color lakes are selected from one or more of the following CI number color lakes: CI15850, CI45380, CI45410, CI73360, CI17200, CI16035, CI42090, CI19140, CI15985, CI47005. The color lakes not only have the characteristics of being granular and insoluble in most solvents, but also can ensure that the colorant will not undergo obvious pigment migration and diffusion in the material body; at the same time, they also have the characteristics of bright color light, high tinting strength and good light fastness, so that the point coloring formed is bright, flexible, stable and durable.

[0031] In the present application, the powder block base material and the dot dye body must satisfy the requirement of fluidity at room temperature and pressure. Among them, 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 in the workplace, usually 1013.25 millibars (mb) or 760 millimeters of mercury (mmHg). In the implementation 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 that there will be a poorly compatible interface between the two materials after filling, resulting in an increased possibility of cracking of the powder block. In the present application, by controlling the powder block base material and the dot dye body to have fluidity at room temperature and pressure, it is ensured that the contact interface between 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] In addition, during the drying and dehydration process of the powder block, if the powder block is dried by conventional heating or other methods, due to the different material compositions of the dot dye body and the powder block base material, the material body may have different shrinkage rates during the heat drying process, which may also cause the dot dyeing area and the powder block base to be easy to crack and poor drop resistance. At the same time, during the drying process, the evaporation of water is often inevitably accompanied by the local migration of the pigment, resulting in unclear edges of the dot dyeing area. Therefore, the present application uses freeze drying to dry the powder block. Freeze drying is a drying method that freezes the water-containing material below the freezing point, converts the water into ice, and then converts the ice into steam under a high vacuum and removes it. Compared with drying methods such as baking, freeze drying can maintain the stability of the material structure and reduce material shrinkage, thereby improving the problem of easy cracking and poor drop resistance between the dot dyeing area and the powder block base. In addition, freeze drying can retain the color of the raw material to the greatest extent, the color of the dot dyeing area is not easy to migrate and lose during the drying process, and the boundary of the dot dyeing area is clearer.

[0033] Specifically, in the mixing step, the raw materials for preparing the cosmetic powder block with a dotting effect can be purchased commercially or homemade. It is understood that the raw materials for preparing the cosmetic powder block 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 various ways commonly used in the prior art to add the raw materials step by step and mix them evenly, such as mechanical stirring, etc., and homogenization, defoaming, etc. can be added during the mixing process. Different mixing methods and steps can be used according to different 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] The specific location of the preset position is not limited in the embodiment of the present application 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 for 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 in the present application, water-insoluble coloring materials are very cleverly used in combination with freeze-drying technology to achieve the effect of dotting 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, 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, good mutual mixing can be achieved 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, so that a local, irregular fixed-point dyeing effect can be formed on the surface and inside of the cosmetic powder block contacting the bottom of the mold cavity, and 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 material and the dot dye body at 25°C is less than 6000 cP. In other embodiments, the viscosity of the powder block base material and the dot dye body at 25°C is 2500 cP to 5000 cP, so that the dot dye body and the powder block base material have good interfacial compatibility at room temperature and pressure, and the powder block base material and the dot dye body have good fluidity during the dot coating and filling process, and the materials on the two interfaces are well mixed during the filling process, reducing the cracking of the powder block.

[0041] Exemplarily, 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 body 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 foregoing values.

[0043] In some embodiments, the powder block base material and the dyed base material may be composed of the same components or different components. When the powder block base material and the dot dyeing base material have the same components, the interfacial compatibility between the powder block base material and the dot dyeing base material is better, which is conducive to reducing the 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 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.

[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 dotted area, so that the edge clarity of the dotted area is affected. Therefore, this application adopts filling under normal temperature conditions, and normal temperature conditions refer 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] The pneumatic feeding device refers to a device that fills the material into the mold by pneumatic conveying. Exemplarily, the pneumatic feeding device may include an air pump and a pipeline connected to the air pump, 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 feeding pipe, an air pump and a discharging pipe. The air pump provides conveying air pressure to suck the powder block base material from the feeding pipe into the air pressure feeding device and then press it into the mold through the discharging 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 air pressure feeding device is: 0.01-0.06 MPa, or 0.02-0.04 MPa. For example, the pressure in the air pressure 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 powder masterbatch 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 can be commercially available, and the present application is not limited thereto.

[0051] After the filling step is completed, the present application has obtained a powder master product pre-cured and formed in the mold. Subsequently, the present application uses a liquid nitrogen quick-freezing device to perform ultra-low temperature solidification on the powder master product. The raw material components in the powder master product undergo molecular quick freezing in an extremely low temperature environment in the liquid nitrogen quick-freezing device. The cosmetic material body 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, and about 80% of the liquid (water, emulsion, etc.) will turn into ice. Unlike the ordinary freezing implemented before demolding in the prior art, the powder master product quickly passes through the maximum ice crystal formation zone during the molecular quick freezing process completed in the liquid nitrogen tunnel in the present application. The distribution of ice crystals in the powder master product is smaller and more uniform. In the subsequent freeze-drying step, the small and uniform ice crystals are directly converted into steam 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. The liquid nitrogen tunnel is also called a liquid nitrogen tunnel quick-freezer, which is a device that uses liquid nitrogen as a cold source and adopts a continuous production method to deliver materials into the quick-freezing tunnel through a conveyor belt to achieve continuous entry and exit and rapid freezing of materials. Exemplarily, the powdered mother product passes through the liquid nitrogen tunnel at a speed of 0.4 to 1.2 m / min on the conveyor belt in the liquid nitrogen tunnel, and the passing time of the powdered mother product in the liquid nitrogen tunnel is 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 analytical drying. Freeze drying includes pre-freezing, sublimation drying and analytical 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 powder master product to -3 ° C to 3 ° C, the heating treatment includes several first heating stages and several first insulation stages, and the first heating stage is alternately carried out with the first insulation stage, the first heating stage is heated at 0.5 to 1 ° C / min for 10 to 20 minutes, and the first insulation time is 1.5 to 2 hours; analytical drying includes: drying the solidified powder master product at 20 ° C to 60 ° C, the drying treatment includes several second heating stages and several second insulation stages, and the second heating stage is alternately carried out with the second insulation stage, the second heating stage is heated at 0.5 to 1 ° C / min for 10 to 20 minutes, and the second insulation time is 1.5 to 2 hours. The freeze-drying process parameters can be adjusted in actual production, and this application does not limit this.

[0055] Sublimation drying in this application document can be understood as a drying method in which the object to be dried is quickly frozen and then the ice therein is sublimated into water vapor under high vacuum conditions to be removed. Analytical drying in this application document can be understood as a drying method in which the object to be dried is placed under negative pressure or vacuum conditions and appropriately heated to the boiling point under negative pressure or the material is solidified by cooling and then dried by controlling the melting point. In some embodiments of this application, pre-freezing may not be performed, and sublimation drying and analytical drying may be directly implemented, or only sublimation drying may be performed.

[0056] In some embodiments, the solvent content in the prepared cosmetic powder block is less than 5%, preferably within 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 molds made of the above-mentioned TPR, TPE, silicone, silicone rubber, rubber or metal, and can prepare powder cosmetics with dotting effect.

[0059] The bottom of the cavity of the selected mold can be flat without a three-dimensional pattern; or the bottom of the cavity of the mold can have a three-dimensional pattern, wherein 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 inside 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, emollients, 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 a 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 former 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, crispy chondrus crispus, xanthan gum, guar gum, tamarind gum, tara gum, gum arabic, tragacanth gum, tara gum, pectin, arabinogalactan, wheat protein, soy protein, gelatin, casein, chitosan, curdlan, cyclodextrin, hyaluronic acid, konjac gum, tremella polysaccharide, codyl gelatin, 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 acrylic acid (esters) / C10-30 alkyl acrylate crosspolymer, carbomer, acrylic acid (esters) / octylacrylamide copolymer, acrylic acid (esters) / ethylhexyl acrylate copolymer, sodium acrylate / sodium acryloyldimethyl taurate copolymer, acrylic acid (esters) / octylacrylamide copolymer, styrene / acrylic acid (esters) copolymer, acrylic acid (esters) copolymer, hydroxyethyl acrylate / sodium acryloyldimethyl taurate copolymer, polyacrylate crosspolymer-6, acrylic acid (esters) / stearyl alcohol polyether-20 methacrylate copolymer, ammonium acryloyldimethyl taurate / behenyl alcohol polyether-25 methacrylate crosspolymer, acrylic acid (esters) copolymer ammonium, 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 aluminum magnesium silicate, sodium magnesium lithium silicate, lithium magnesium silicate, sodium magnesium silicate, montmorillonite or its 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 their derivatives;

[0071] The animal and 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, polydimethylsiloxane, caprylyl polymethylsiloxane, phenyl trimethicone, cetyl polydimethylsiloxane, 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, white 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, sodium calcium 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 cosmetics are 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 disclosure of the present application in more detail, and these examples are for illustrative purposes only, as various modifications and variations within the scope of the disclosure of the present application are 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 treatment, and 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 for pre-dissolution; after heating phase A, add phase B, phase C, and phase D to phase A for emulsification and homogenization; mix phase E and phase F, and finally add phase G for emulsification and homogenization. After emulsification and homogenization, the 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 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 block base, and the preparation steps are also the same. Therefore, it can be prepared separately, or part of the powder block base prepared in step (1) can be used. 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). The dot dye base is mixed with the above two water-insoluble color powders to obtain the dot dye base.

[0085] (3) Spot coating: A silicone mold is provided, wherein the silicone mold has a cavity opening upward and a floral relief three-dimensional pattern at the bottom of the cavity; according to a pre-speckling design, two powder block base materials are spot coated at several preset positions at the bottom of the cavity of the silicone mold.

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

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

[0088] (6) Freeze drying: freeze drying the powder masterbatch after demoulding to obtain a cosmetic powder block with a dotting effect. Wherein, freeze drying includes pre-freezing, sublimation drying and analytical 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 stage and the first heat preservation stage are performed alternately. Analysis 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 stage and the second heat preservation stage 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] Embodiment 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] Embodiment 6-7

[0094] The difference between Example 6-7 and Example 1 is that the material body is not heated before filling, but the material body is filled into the mold after the water-insoluble coloring material is dotted at room temperature through the air pressure feeding device according to a preset amount. Specifically, the material body is pressed into the mold by the action of air pressure. In Examples 6 and 7, the pressure in the air pressure feeding device is 0.02MPa and 0.06MPa, respectively.

[0095] Embodiment 8-9

[0096] The difference between Example 8-9 and Example 1 is that the step of freezing the mixed material body in the mold is performed in a liquid nitrogen tunnel. The powdered masterbatch passes through the liquid nitrogen tunnel on a conveyor belt in the liquid nitrogen tunnel at a speed of 0.6 m / min, and the powdered masterbatch passes through the liquid nitrogen tunnel for 10 minutes.

[0097] In Examples 8 and 9, the temperature in the liquid nitrogen tunnel is -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) is not freeze-drying, but drying by 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 reaches about 8000 cP, and the fluidity is poor. In the preparation process, normal temperature and pressure filling is adopted, and liquid nitrogen tunnel ultra-low temperature freezing is performed before demoulding.

[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 powders were prepared according to the methods of Examples 1 to 10 and Comparative Examples 1 to 4, and 100 pressed powders 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 powder with the naked eye or with the help of a microscope, including the appearance observation of the dotting effect, with a focus on the dotting effect of the powder, including whether the edges of the dotting area are clear, whether color loss occurs, whether there are bubbles in the sharp parts 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 table and 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 let the powder block fall onto the hard board, pick up the powder block that has fallen onto the table, and check whether the powder block surface is cracked or broken. If the powder block is cracked or broken, stop the drop test for this powder block. If the powder block is normal, then perform the second drop test. The operation steps for the second drop test are the same as the first drop test. If the powder block is cracked or broken, then stop the drop test for this powder block; if the powder block is normal, then perform the third drop test. The operation steps for the third drop test are the same as the first drop test.

[0117] The ratio of the number of powder cakes that broke in each drop test to the total number of powder cakes that were dropped in the drop test is the breakage rate of each drop test. The first breakage rate, the second breakage rate, and the third breakage rate of Examples 1 to 10 and Comparative Examples 1 to 4 are recorded respectively. The sum of the three breakage rates is used to score the drop resistance. 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 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 demolded and freeze-dried. Compared with the cosmetic powder blocks of Comparative Examples 1 to 4 which 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 ground surface, and reduced occurrence of powder block cracking and falling breakage.

[0125] In Examples 1 to 10, Examples 1 to 5 use a dot dye body containing a water-insoluble coloring material for dot dyeing, and control the powder block base material and the dot dye body to have good fluidity at room temperature and pressure, so that the powder block base material 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, thereby 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 the 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 are clearer. Please refer to the product effect of Example 1 Figure 1 .

[0126] Examples 6 to 7 further improve the filling method based on Examples 1 to 5, and use a gas pressure feeding device to implement material filling. Compared with Examples 1 to 5 of heating filling, the edge of the dotted area is clearer, the fine relief grinding surface is filled more perfectly, no bubbles are generated on the sharp parts, and due to the auxiliary effect of gas pressure on material filling, the fine cracking and falling breakage rate in the powder block preparation process is further reduced.

[0127] Based on Examples 1 to 5, Examples 8 to 9 further improve the freezing method before demoulding, and use a liquid nitrogen tunnel to pre-freeze the mixed material body at ultra-low temperature before demoulding. Compared with Examples 1 to 5 using ordinary freezing methods, ultra-low temperature freezing in the liquid nitrogen tunnel can form fine and evenly distributed ice crystals inside the material body in a very short time. After the fine and evenly distributed ice crystals are directly sublimated into water vapor and removed through the freeze-drying step, the drop resistance of the prepared powder block is further improved.

[0128] Example 10 is based on Examples 1 to 5, and a pneumatic feeding device is used to implement material filling. A liquid nitrogen tunnel is used to pre-freeze the mixed material at ultra-low temperature before demolding. Therefore, the edge of the dotted area is 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 drying at 55°C and 40°C. The edges of the dotted areas were unclear, the color was lost 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 8000cP 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, and the interface compatibility was poor. During the drying process, fine cracks were prone to appear between the powder block base and the dot dyeing area, and the prepared cosmetic powder block had poor drop resistance. Even if room temperature and 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 is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope 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 material: mixing raw materials for preparing a cosmetic powder block to prepare a powder block base material; 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 color powder or lake; Spot coating: providing a mold, wherein the mold has at least one cavity opening upward, and spot coating the at least one spot dye body at 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 master product, and then separating the powdered master product from the mold; Freeze drying: freeze drying the powdered masterbatch after demoulding to obtain a cosmetic powder block with a dotting effect; The powder block base material and the dot dye body have fluidity at normal temperature and pressure.

2. The method for preparing the cosmetic powder block with dotting effect according to claim 1, characterized in that: The viscosity of the powder block base material and the dot dye body at 25° C. is below 6000 cP; preferably, the viscosity of the powder block base material and the dot dye body at 25° C. is 2500 cP to 5000 cP.

3. The method for preparing the cosmetic powder block with dotting effect according to claim 1, characterized in that: 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.

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

5. The method for preparing the cosmetic powder block with dotting effect according to claim 4, characterized in that: The pressure in the air pressure feeding device is 0.01-0.06 MPa, preferably 0.02-0.04 MPa.

6. The method for preparing the cosmetic powder block with dotting effect according to claim 1, characterized in that: 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 to -70°C, preferably -95 to -80°C.

7. The method for preparing the cosmetic powder block with dotting effect according to claim 1, characterized in that: The freeze drying includes pre-freezing, sublimation drying and analytical drying.

8. The method for preparing the cosmetic powder block with dotting effect according to claim 1, characterized in that: 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.

9. The method for preparing the cosmetic powder block with 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 emulsified system.

10. A cosmetic powder block with a dotting effect, characterized in that: The method is prepared by any one of claims 1 to 9.

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