Emulsifier-free Pickering liquid foundation and preparation method thereof

Abstract

The invention belongs to the technical field of cosmetics, and provides an emulsifier-free Pickering liquid foundation and a preparation method thereof. The liquid foundation provided by the invention comprises an oil phase, an oil phase thickener, a water phase, a film-forming agent, organic silicon microspheres and a coloring agent, wherein the oil phase comprises C9-C30 alkane and / or polysiloxane; the water phase comprises water and a water-soluble component; the oil phase thickening agent is a montmorillonite thickening agent; the film-forming agent is selected from an MQ resin film-forming agent and / or an acrylate film-forming agent; the organic silicon microspheres are polymethylsilsesquioxane microspheres. Compared with the traditional liquid foundation, the emulsifier-free Pickering liquid foundation provided by the invention is smaller in irritation, fresh and cool in skin feeling and good in makeup holding property.

Description

Technical Field

[0001] The present invention relates to the technical field of cosmetics, and in particular to an emulsifier-free Pickering liquid foundation and a preparation method thereof. Background Art

[0002] Liquid foundation is a cosmetic product used on the face. Its primary function is to modify skin tone, conceal blemishes, even out skin tone, and improve skin texture, resulting in a natural, even, and smooth appearance. Liquid foundation is typically in liquid form and has good fluidity, allowing for easy and even application. It is also required to be lightweight, long-lasting, and comfortable. Liquid foundation is suitable for all skin types (e.g., dry, oily, combination, sensitive), and users can choose the right foundation based on their needs and skin type.

[0003] Liquid foundations typically consist of an aqueous phase, an oil phase, an emulsifier, preservatives, and other additives (such as antioxidants, colorants, and flavors). Emulsifiers stabilize the oil-water phases to form a stable emulsion, preventing separation and extending the product's shelf life. Furthermore, the addition of emulsifiers ensures a uniform texture, making the foundation easier to apply and providing even coverage, suitable for all skin types. However, the emulsifiers used in existing liquid foundations are often surfactants, which can cause a certain degree of stickiness and irritation. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide an emulsifier-free Pickering liquid foundation and a preparation method thereof. The liquid foundation is prepared by forming a stable spatial structure at the water-oil interface through powder with a specific particle size without adding a surfactant. The liquid foundation prepared by the present invention also has a better long-lasting makeup effect and a more refreshing skin feel.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The first aspect of the present invention provides an emulsifier-free Pickering liquid foundation, comprising an oil phase, an oil phase thickener, an aqueous phase, a film-forming agent, silicone microspheres and a colorant, wherein the oil phase comprises C9-C30 alkanes and / or polysiloxanes; the aqueous phase comprises water and water-soluble components; the oil phase thickener is a montmorillonite thickener; the film-forming agent is selected from MQ resin film-forming agents and / or acrylate film-forming agents; the silicone microspheres are polymethylsilsesquioxane microspheres; based on the total mass of the liquid foundation, the total content of the C9-C30 alkanes and / or polysiloxanes is 15 to 50 wt%; the content of the oil phase thickener is 0.1 to 2 wt%; the content of the film-forming agent is 1 to 10 wt%; the content of the silicone microspheres is 2 to 8 wt%, and the particle size is 2 to 5 microns.

[0007] Compared to the prior art, the present invention provides an emulsifier-free Pickering liquid foundation. Montmorillonite is used as an oil-phase thickener to thicken an oil phase containing C9-C30 alkanes and / or polysiloxanes, MQ resins and / or acrylate film-forming agents are used, and polymethylsilsesquioxane microspheres are used instead of traditional emulsifiers. The oil phase and aqueous phase are then compounded to produce a stable, emulsifier-free Pickering liquid foundation. Because the present invention avoids the use of surfactants as emulsifiers, the resulting liquid foundation has a smooth, non-irritating feel.

[0008] The structural formula of the polymethylsilsesquioxane used in the present invention is [CH3SiO 1.5 ] n Each silicon atom is connected to adjacent silicon atoms via an oxygen atom, and each silicon atom is attached to three methyl (-CH3) groups. This structure imparts excellent hydrophobicity and lipophilicity to the powder, allowing for good adsorption on the surface of the oil phase, forming a relatively stable system. Furthermore, due to different polymerization methods, the particle size of the polymethylsilsesquioxane microspheres varies, generally ranging from 1.5 to 20 microns. The polymethylsilsesquioxane used in this invention has a particle size range of 2 to 5 microns, thereby achieving both emulsification and stabilization of the liquid foundation. In addition, the C9-C30 alkanes and / or polysiloxanes and montmorillonite thickeners in the oil phase also provide support and promotion for the emulsification and stabilization of the polymethylsilsesquioxane microspheres: the montmorillonite thickeners can disperse in the oil phase and form a card structure to support the viscosity and suspension ability of the system. The C9-C30 alkanes and / or polydimethylsiloxanes in the oil phase have suitable polarity and good compatibility with the polymethylsilsesquioxane microspheres, further improving the stability of the polymethylsilsesquioxane microspheres adsorbed on the oil / water interface.

[0009] Preferably, the C9-C30 alkane is one or more selected from squalane, liquid paraffin, hydrogenated polyisobutylene, C12-15 alcohol benzoate, and isomeric paraffin.

[0010] Preferably, the polysiloxane is selected from one or more of polydimethylsiloxane, phenyl trimethicone, diphenylsiloxy trimethicone, octyl trimethicone, and methyl trimethicone.

[0011] Preferably, the montmorillonite thickener is selected from hectorite and / or disteardimethylammonium hectorite.

[0012] Preferably, the film former is selected from trimethylsiloxysilicate and / or acrylates / polytrimethylsiloxane methacrylate copolymer.

[0013] Preferably, the colorant comprises a color powder treated with a surface treatment agent; wherein the surface treatment agent is selected from one or more of triethoxycaprylylsilane, polydimethylsiloxane, triethoxysilylethyl polydimethylsiloxyethylhexyl polydimethylsiloxane, isopropyl titanium triisostearate, sodium stearoyl glutamate, and lauroyl lysine; and the color powder is selected from micron-sized iron oxide and / or titanium dioxide colorants.

[0014] Preferably, the colorant is a toner treated with triethoxysilylethyl polydimethylsiloxyethylhexyl polydimethylsiloxane; the toner is micron-sized iron oxide and titanium dioxide.

[0015] More preferably, the colorant is a toner treated with triethoxysilylethyl polydimethylsiloxyethylhexyl polydimethylsiloxane.

[0016] Preferably, the water-soluble components in the aqueous phase include inorganic salts and / or polyols.

[0017] Preferably, the inorganic salt is selected from magnesium sulfate and / or sodium chloride; the polyol is selected from one or more of glycerol, propylene glycol, methylpropylene glycol, butylene glycol, pentanediol, isopentyl glycol, hexylene glycol, and dipropylene glycol.

[0018] In a second aspect, the present application provides a method for preparing an emulsifier-free Pickering liquid foundation, comprising the following steps: (1) adding an aqueous phase component to an aqueous phase pot and stirring under heating conditions until the mixture is uniformly mixed; (2) pre-dispersing an oil phase thickener and a film-forming agent respectively until they are uniformly mixed, and then adding them together with the oil phase component to an emulsifying pot, mixing and dispersing them uniformly; (3) adding a colorant and silicone microspheres to an emulsifying pot, stirring and dispersing them uniformly; (4) slowly adding the pre-prepared aqueous phase to the emulsifying pot for full emulsification, stirring at high speed, and homogenizing and emulsifying until there are no obvious particles, thereby preparing an emulsifier-free Pickering liquid foundation.

[0019] Compared with the prior art, the emulsifier-free Pickering liquid foundation prepared by the present invention has at least the following advantages:

[0020] (1) The oil-in-water Pickering emulsification technology is used to form a stable particle layer stabilization system through powder adsorption at the oil-water interface. It not only has better biocompatibility, but also reduces the use of surfactants and the probability of irritation problems caused by surfactants. Its special system dispersion structure brings better stability to the system.

[0021] (2) Adding more powder to the formula gives the product the ability to effectively absorb the oil secreted by the skin after use, thereby enhancing the overall long-lasting ability of the product, and making the makeup not dull or fading after application, and having a more refreshing skin feel when applied. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions, and advantages of the present invention more clearly apparent, various embodiments of the present invention will be described in detail below. However, those skilled in the art will appreciate that many technical details are provided in various embodiments of the present invention to help readers better understand the present application. However, even without these technical details and the various variations and modifications based on the following embodiments, the technical solutions claimed in the claims of this application can still be implemented.

[0023] According to the first aspect of the present application, an embodiment of the present application provides an emulsifier-free Pickering liquid foundation, comprising an oil phase, an oil phase thickener, an aqueous phase, a film-forming agent, silicone microspheres and a colorant, wherein the oil phase comprises C9-C30 alkanes and / or polysiloxanes; the aqueous phase comprises water and water-soluble components; the oil phase thickener is a montmorillonite thickener; the film-forming agent is selected from MQ resin film-forming agents and / or acrylate film-forming agents; the silicone microspheres are polymethylsilsesquioxane microspheres; based on the total mass of the foundation, the total content of the C9-C30 alkanes and / or polysiloxanes is 15 to 50 wt%; the content of the oil phase thickener is 0.1 to 2 wt%; the content of the film-forming agent is 1 to 10 wt%; the content of the silicone microspheres is 2 to 8 wt%, and the particle size is 2 to 5 microns.

[0024] In the prior art, traditional water-in-oil foundations use surfactants as emulsifiers, which can cause a certain degree of stickiness and irritation. Furthermore, some small-molecule surfactants used as emulsifiers have certain biological toxicities. The emulsifier-free Pickering foundation provided in this application abandons the use of surfactants as emulsifiers and instead utilizes ultrafine solid particles in place of emulsifiers to produce an emulsifier-free Pickering foundation.

[0025] Specifically, in an embodiment of the present application, montmorillonite is used as an oil-phase thickener to thicken an oil phase containing C9-C30 alkanes and / or polydimethylsiloxane, MQ resin-based film-forming agents and / or acrylate-based film-forming agents are used, and polymethylsilsesquioxane microspheres are used instead of traditional emulsifiers. The oil phase and aqueous phase are then compounded to produce a stable, emulsifier-free Pickering liquid foundation. Because the liquid foundation of the present invention avoids the use of surfactants as emulsifiers, the resulting liquid foundation has a smooth, non-irritating feel.

[0026] The structural formula of the polymethylsilsesquioxane used in the present invention is [CH3SiO 1.5 ] nEach silicon atom is linked to adjacent silicon atoms via an oxygen atom, and each silicon atom is attached to three methyl (-CH3) groups. This structure imparts excellent hydrophobicity and lipophilicity to the powder, allowing for good adsorption on the surface of the oil phase, forming a relatively stable system. Furthermore, due to different polymerization methods, the particle size of the polymethylsilsesquioxane microspheres varies. The polymethylsilsesquioxane used in this invention has a particle size range of 2 to 5 microns, thereby achieving both emulsification and stabilization of the liquid foundation. In addition, the C9-C30 alkanes and / or polydimethylsiloxane and montmorillonite thickeners in the oil phase also provide support and promotion for the emulsification and stabilization of the polymethylsilsesquioxane microspheres: the montmorillonite thickener can disperse in the oil phase and form a card structure to support the viscosity and suspension ability of the system. The C9-C30 alkanes and / or polydimethylsiloxane in the oil phase have suitable polarity and good compatibility with the polymethylsilsesquioxane microspheres, further improving the stability of the polymethylsilsesquioxane microspheres adsorbed on the oil / water interface.

[0027] In some embodiments of the present application, the C9-C30 alkane is selected from one or more of squalane, liquid paraffin, hydrogenated polyisobutylene, C12-15 alcohol benzoate, and isomeric paraffin.

[0028] In some embodiments of the present application, the polysiloxane is selected from one or more of polydimethylsiloxane, phenyl trimethicone, diphenylsiloxy trimethicone, octyl trimethicone, and methyl trimethicone.

[0029] In some embodiments of the present application, the montmorillonite thickener is selected from hectorite and / or disteardimethylammonium hectorite.

[0030] In some embodiments of the present application, the film-forming agent is selected from trimethylsiloxysilicate and / or acrylic acid (ester) / polytrimethylsiloxane methacrylate copolymer.

[0031] In some embodiments of the present application, the colorant comprises a color powder treated with a surface treatment agent; wherein the surface treatment agent is selected from one or more of triethoxycaprylylsilane, polydimethylsiloxane, triethoxysilylethyl polydimethylsiloxyethylhexyl polydimethylsiloxane, isopropyl titanium triisostearate, sodium stearoyl glutamate, and lauroyl lysine; and the color powder is selected from micron-sized iron oxide and / or titanium dioxide colorants.

[0032] In some embodiments of the present application, the colorant is preferably a toner treated with triethoxysilylethyl polydimethylsiloxyethylhexyl polydimethylsiloxane; the toner is micron-sized iron oxide and titanium dioxide. The iron oxide is a mixture of iron oxide red CI 77491, iron oxide yellow CI 77492, and iron oxide black CI 77499, with the iron oxide red added in an amount of 0.01%-2%, preferably 0.1%-0.5%; the iron oxide yellow CI 77491 added in an amount of 0.01%-2%, preferably 0.5%-1.5%; the iron oxide black added in an amount of 0.01%-2%, preferably 0.01-0.2%; and the titanium dioxide CI 77891 added in an amount of 1%-20%, preferably 4%-15%.

[0033] In some embodiments of the present application, the colorant is a color powder treated with triethoxysilylethyl polydimethylsiloxyethylhexyl polydimethylsiloxane.

[0034] In some embodiments of the present application, the water-soluble components in the aqueous phase include inorganic salts and / or polyols.

[0035] In some embodiments of the present application, the inorganic salt is selected from magnesium sulfate and / or sodium chloride; and the polyol is selected from one or more of glycerol, propylene glycol, methylpropylene glycol, butylene glycol, pentanediol, isopentyl glycol, hexylene glycol, and dipropylene glycol. The polyol is added to the formulation in an amount of 0.1% to 20%, preferably 5% to 15%.

[0036] In some embodiments of the present application, the polyol is preferably a mixture of glycerol and butanediol, and the mass ratio of glycerol to butanediol is 1:10 to 8:2, preferably 3:8.

[0037] In a second aspect, the present application provides a method for preparing an emulsifier-free Pickering liquid foundation, comprising the following steps: (1) adding an aqueous phase component to an aqueous phase pot and stirring under heating conditions until the mixture is uniformly mixed; (2) pre-dispersing an oil phase thickener and a film-forming agent respectively until they are uniformly mixed, and then adding them together with the oil phase component to an emulsifying pot, mixing and dispersing them uniformly; (3) adding a colorant and silicone microspheres to an emulsifying pot, stirring and dispersing them uniformly; (4) slowly adding the pre-prepared aqueous phase to the emulsifying pot for full emulsification, stirring at high speed, and homogenizing and emulsifying until there are no obvious particles, thereby preparing an emulsifier-free Pickering liquid foundation.

[0038] The advantages of the present application are further illustrated below with reference to specific examples. It should be understood that these examples are only used to illustrate the present application and are not used to limit the scope of the present application.

[0039] Examples 1 to 10

[0040] Prepare Pickering Liquid Foundation as follows:

[0041] (1) Add the aqueous phase components to the aqueous phase pot and stir under heating conditions until the mixture is uniform;

[0042] (2) After the oil phase thickener and film-forming agent are pre-dispersed and treated uniformly, they are added to the emulsifying pot together with the oil phase components and mixed and dispersed uniformly;

[0043] (3) Add the colorant and silicone microspheres into an emulsifying pot and stir them thoroughly to disperse them evenly; the colorant used is a toner treated with triethoxysilylethyl polydimethylsiloxyethylhexyl polydimethylsiloxane;

[0044] (4) Slowly add the prepared aqueous phase into the emulsifying pot for full emulsification, stir at high speed, and homogenize and emulsify until there are no obvious particles, thereby preparing the emulsifier-free Pickering liquid foundation.

[0045] Comparative Examples 1 to 11

[0046] The formulation compositions of Comparative Examples 1 and 2 are substantially the same as those of Examples 1 and 2, respectively, with the only difference being that the polymethylsilsesquioxane microspheres are omitted in Comparative Examples 1 and 2.

[0047] The only difference between Comparative Examples 3 and 4 and Example 1 is that starch microspheres and another type of organosilicon microspheres, vinyl polydimethylsiloxane cross-linked polymer microspheres, were used instead of polymethylsilsesquioxane microspheres, respectively.

[0048] The only difference between Comparative Examples 5 and 6 and Example 1 is that the content of polymethylsilsesquioxane microspheres is too small or too large, namely 0.5% and 12% respectively.

[0049] The only difference between Comparative Examples 7 and 8 and Example 1 is that the particle size of the polymethylsilsesquioxane microspheres is too small or too large, namely 1 μm and 8 μm, respectively.

[0050] The difference between Comparative Example 9 and Example 1 is that, instead of using C9-C30 alkane and / or polysiloxane as the oil phase component, caprylic / capric triglyceride is used as the oil phase component.

[0051] The difference between Comparative Example 10 and Example 1 is that no montmorillonite thickener is added or the montmorillonite thickener is replaced by dextrin myristate thickener.

[0052] The difference between Comparative Example 11 and Example 1 is that PEG-10 polydimethylsiloxane is added as an emulsifier to prepare a conventional water-in-oil foundation, not a water-in-oil Pickering emulsion.

[0053] Detection:

[0054] 1. Observe whether a stable Pickering system is formed.

[0055] 2. Skin feel test:

[0056] The makeup staying power and refreshing feeling were evaluated using a volunteer-rated scale. Scores range from 1 to 5. Values in the table are mean ± standard deviation. 1 is very poor, 2 is poor, 3 is fair, 4 is excellent, and 5 is very excellent. A total of 21 female volunteers aged 25-40 were enrolled.

[0057] 3. Irritation test:

[0058] Patch test was conducted on 30 female subjects aged 25-40 years. The proportion of irritation cases in the total test population was recorded for each embodiment and comparative example.

[0059] The specific components and test results of the liquid foundations prepared in Examples 1 to 10 and Comparative Examples 1 to 11 are shown in Tables 1 and 2, respectively.

[0060] Table 1 Components and contents of Examples 1 to 10, test results

[0061]

[0062]

[0063] Table 2 Components and contents of comparative examples 1 to 11, test results

[0064]

[0065]

[0066] From the comparison of the embodiments and comparative examples in Table 1 and Table 2, it can be seen that: Examples 1 to 10, according to the technical solution provided in the present application, use montmorillonite as an oil phase thickener to thicken the oil phase containing C9-C30 alkanes and / or polysiloxanes, use MQ resin film-forming agents and / or acrylate film-forming agents, and use polymethylsilsesquioxane microspheres instead of traditional emulsifiers. The addition amount of each component is controlled within a specific range, and a stable emulsifier-free Pickering liquid foundation is successfully obtained. The liquid foundations prepared in Examples 1 to 10 have good makeup staying power, a refreshing skin feel, and are non-irritating.

[0067] Comparative Examples 1 to 11 show that in the technical solution provided by the present application, the polymethylsilsesquioxane microspheres used, their content and microsphere particle size are all key factors affecting the formation of a stable Pickering liquid foundation. When other silicone microspheres are used to replace the polymethylsilsesquioxane microspheres, or when polymethylsilsesquioxane microspheres are used but their particle size is too large or too small, or their content range is not within the range provided by the present application, a stable Pickering liquid foundation cannot be prepared or the skin feel of the prepared liquid foundation is seriously affected. In addition, the oil phase components and oil phase thickeners used in the technical solution provided by the present application also have a significant effect on the stability of the Pickering liquid foundation. Only by using the oil phase components and oil phase thickeners provided by the present application in combination with polymethylsilsesquioxane microspheres can a stable Pickering liquid foundation with good makeup holding power, a refreshing skin feel, and no irritation be obtained.

[0068] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and that in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. An emulsifier-free Pickering liquid foundation, characterized in that Contains oil phase, oil phase thickener, water phase, film former, silicone microspheres and colorant. The oil phase comprises C9-C30 alkanes and / or polysiloxanes; the aqueous phase comprises water and water-soluble components; the oil phase thickener is a montmorillonite thickener; the film-forming agent is selected from MQ resin film-forming agents and / or acrylate film-forming agents; and the silicone microspheres are polymethylsilsesquioxane microspheres; Based on the total mass of the liquid foundation, the total content of the C9-C30 alkanes and / or polysiloxanes is 15 to 50 wt%; the content of the oil phase thickener is 0.1 to 2 wt%; the content of the film-forming agent is 1 to 10 wt%; the content of the silicone microspheres is 2 to 8 wt%, and the particle size is 2 to 5 microns.

2. The emulsifier-free Pickering liquid foundation according to claim 1, characterized in that The C9-C30 alkane is one or more selected from squalane, liquid paraffin, hydrogenated polyisobutylene, C12-15 alcohol benzoate, and isomeric paraffin; The polysiloxane is selected from one or more of polydimethylsiloxane, phenyl trimethicone, diphenylsiloxy trimethicone, octyl trimethicone, and methyl trimethicone.

3. The emulsifier-free Pickering liquid foundation according to claim 1, characterized in that The montmorillonite thickener is selected from hectorite and / or disteardimethylammonium hectorite.

4. The emulsifier-free Pickering liquid foundation according to claim 1, characterized in that The film former is selected from trimethylsiloxysilicate and / or acrylate / polytrimethylsiloxane methacrylate copolymer.

5. The emulsifier-free Pickering liquid foundation according to claim 1, characterized in that The colorant comprises a toner treated with a surface treatment agent; The surface treatment agent is selected from one or more of triethoxycaprylylsilane, polydimethylsiloxane, triethoxysilylethyl polydimethylsiloxyethylhexyl polydimethylsiloxane, isopropyl titanium triisostearate, sodium stearoyl glutamate, and lauroyl lysine; The color powder is selected from micron-sized iron oxide and / or titanium dioxide colorants.

6. The emulsifier-free Pickering liquid foundation according to claim 5, characterized in that The colorant is a toner treated with triethoxysilylethyl polydimethylsiloxyethylhexyl polydimethylsiloxane.

7. The emulsifier-free Pickering liquid foundation according to claim 1, characterized in that The water-soluble components in the aqueous phase include inorganic salts and / or polyols.

8. The emulsifier-free Pickering liquid foundation according to claim 7, characterized in that The inorganic salt is selected from magnesium sulfate and / or sodium chloride; The polyol is selected from one or more of glycerol, propylene glycol, methylpropylene glycol, butylene glycol, pentanediol, isoprene glycol, hexylene glycol, and dipropylene glycol.

9. The method for preparing the emulsifier-free Pickering liquid foundation according to any one of claims 1 to 8, characterized in that: The following steps are involved: (1) Add the aqueous phase components to the aqueous phase pot and stir under heating conditions until the mixture is uniform; (2) After the oil phase thickener and film-forming agent are pre-dispersed and treated uniformly, they are added to the emulsifying pot together with the oil phase components and mixed and dispersed uniformly; (3) Add the colorant and silicone microspheres into the emulsifying pot and stir thoroughly to disperse them evenly; (4) Slowly add the prepared aqueous phase into the emulsifying pot for full emulsification, stir at high speed, and homogenize and emulsify until there are no obvious particles, thereby preparing the emulsifier-free Pickering liquid foundation.

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