Microcapsule containing cosmetic functional substance aqueous solution, preparation method of microcapsule and cosmetic

Abstract

The invention provides a microcapsule containing an aqueous solution of a cosmetic functional substance, a preparation method of the microcapsule and a cosmetic. The microcapsule comprises a polyurea film; an aqueous solution containing a makeup functional substance; the polyurea film wraps the exterior of the water solution containing the makeup functional substances; the thickness of the polyurea film is less than or equal to 700nm; the aqueous solution containing the makeup functional substance comprises at least one of water and a water-soluble active substance. The water solution containing the makeup functional substances is wrapped with the polyurea film, so that the water-soluble active substances are effectively wrapped, the water-soluble active substances are endowed with unique forms, the water-soluble active substances are protected, release of the water-soluble active substances is delayed, and the efficacy of the cosmetics can be greatly improved. Furthermore, according to the technical scheme, the water solution containing the makeup functional substances is wrapped with the polyurea film, the thickness of the polyurea film is smaller than or equal to 700 nm, the thickness of a shell of the water solution containing the makeup functional substances is greatly reduced, and the skin feeling of consumers is improved.

Description

Technical Field

[0001] The present application relates to the field of cosmetics, and more specifically, to microcapsules containing aqueous solutions of cosmetic functional substances, a preparation method thereof, and cosmetics. Background Art

[0002] Cosmetic products often contain a large amount of water and corresponding water-soluble functional substances. These substances are mixed with other water-insoluble substances under the action of surfactant to form a heterogeneous system. These heterogeneous systems can remain stable for a certain period of time. However, when the storage time is prolonged, these heterogeneous systems will gradually become unstable, causing significant changes in the appearance and function of the system.

[0003] After the beauty functional substances are microencapsulated to form microcapsules, they are mixed with other substances in beauty products. On the one hand, microencapsulation can protect the microencapsulated substances and delay their release; on the other hand, microencapsulation can give certain functional substances a unique form, enhance their appearance, and improve the grade and added value of beauty products.

[0004] However, compared with the microencapsulation of oil-soluble substances, the microencapsulation of water-soluble substances is relatively difficult. The microencapsulation of water-soluble substances is generally encapsulated using the reverse emulsion method, but the quality of microcapsules prepared by this method is poor, the particle size dispersion is large, and it is generally used to prepare microcapsules with hard capsule walls. Water-soluble substances can also be microencapsulated using microfluidics technology, but this method is technically complex, difficult to control, and has low production efficiency.

[0005] Therefore, in order to promote the application of microencapsulated water-soluble cosmetic functional substances in cosmetic products, it is urgent to use new microencapsulation technology to prepare microcapsules containing water-soluble cosmetic functional substances. Summary of the invention

[0006] The purpose of the embodiments of the present application is to provide a microcapsule containing an aqueous solution of a beauty functional substance, a preparation method thereof, and cosmetics.

[0007] In a first aspect, the present application provides a microcapsule containing an aqueous solution of a beauty functional substance.

[0008] Microcapsules include:

[0009] Polyurea film;

[0010] An aqueous solution containing cosmetic functional substances; a polyurea film is wrapped around the outside of the aqueous solution containing cosmetic functional substances;

[0011] The thickness of the polyurea film is less than or equal to 700nm;

[0012] The aqueous solution containing cosmetic functional substances contains at least one of water and water-soluble active substances.

[0013] In the above technical solution, the polyurea film is wrapped around the outside of the aqueous solution containing beauty functional substances, which not only effectively wraps the water-soluble active substances, but also gives the water-soluble active substances a unique form, protects the water-soluble active substances, and delays their release. When the microcapsules containing the aqueous solution of beauty functional substances are applied to cosmetics, the microcapsule structure delays the release of the active substances, greatly reducing the loss of activity, thereby greatly improving the efficacy of the cosmetics. Furthermore, in the above technical solution, a polyurea film is used to wrap the outside of the aqueous solution containing beauty functional substances, and the thickness of the polyurea film is less than or equal to 700nm, which greatly reduces the thickness of the "shell" of the aqueous solution containing beauty functional substances, and greatly improves the skin feel of consumers. Compared with the micron-level "hard shell" microcapsules in the current prior art, the skin feel of cosmetics is greatly improved, and this nano-level "film" has no residue after use, which greatly expands the scope of application.

[0014] In other embodiments of the present application, the thickness of the polyurea film is 100 nm to 400 nm.

[0015] In other embodiments of the present application, the water-soluble active substance is a non-acidic substance;

[0016] Optionally, the water-soluble active substance includes at least one of glycerin, vitamin C, collagen, polypeptide, and plant extract;

[0017] Optionally, the water includes: at least one of pure water and spring water;

[0018] Optionally, the polyurea film is a hyperbranched polyurea film.

[0019] In other embodiments of the present application, a first solution is prepared, and the first solution includes: an aqueous solution containing a beauty functional substance and a first film-forming monomer of a polyurea film;

[0020] preparing a second solution, the second solution comprising: a second film-forming monomer for the polyurea film;

[0021] A pumping device is used to pump out the first solution, and an electrostatic field is set at the pump outlet so that the first solution is charged after being pumped out and enters the electrostatic field. Under the action of the electrostatic field, the first solution drips into the second solution in the form of droplets to form a microcapsule solution;

[0022] The microcapsule solution was allowed to continue to react for more than 1 hour.

[0023] In other embodiments of the present application, the second solution includes: a surfactant;

[0024] Optionally, the surfactant includes a nonionic surfactant; optionally, the surfactant includes polyethylene glycol and dipolyhydroxystearate.

[0025] In other embodiments of the present application, the second solution includes: a low-polarity organic solvent.

[0026] In other embodiments of the present application, the second solution includes: 3 g to 12 g of a second film-forming monomer, 0.1 wt % to 2 wt % of a surfactant, and 20 mL to 100 mL of an organic solvent;

[0027] Optionally, the second solution includes: 6 g of a second film-forming monomer, 1.0 wt % of a surfactant, and 50 mL of an organic solvent.

[0028] In other embodiments of the present application, a pumping device is used to pump out the first solution, including:

[0029] Using a pumping device, pumping out the first solution at a rate of less than or equal to 50 mL / h;

[0030] Optionally, the voltage of the electrostatic field is less than or equal to 30 kV.

[0031] In other embodiments of the present application, the microcapsule solution is allowed to continue to react for more than 1 hour, including:

[0032] The microcapsule solution is kept at 30°C-40°C for 1 to 3 hours.

[0033] In a second aspect, the present application provides a cosmetic comprising microcapsules containing an aqueous solution of a cosmetic functional substance provided by any one of the first aspect or the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A schematic diagram of the structure of an electrostatic spray device provided in an embodiment of the present application;

[0036] Figure 2 The scanning electron microscope images of the hard microcapsules prepared in Comparative Example 1, wherein (a) is a complete microcapsule and (b) is a cross-sectional view of the microcapsule. As can be seen from the figure, the capsule wall of the microcapsule is relatively thick, about 10 μm;

[0037] Figure 3 for Figure 2 The morphology of the thick-walled microcapsules after crushing is shown, which leave a lot of residues on the surface of the glass sheet;

[0038] Figure 4 This is an optical microscope picture of the microcapsules prepared in Example 1.

[0039] Figure 5 This is a scanning electron microscope image of the microcapsules prepared in Example 1. The microcapsules have a thin and dense polyurea capsule wall and can maintain a spherical shape even in the high vacuum characterization environment of the SEM;

[0040] Figure 6 The microcapsule wall cross-section of the microcapsule prepared in Example 1 was observed using a scanning electron microscope;

[0041] Figure 7 This is an optical microscope picture of the microcapsules prepared in Example 2;

[0042] Figure 8 This is an optical microscope picture of the microcapsules prepared in Example 3. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0044] Therefore, the following detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0045] The present application provides a microcapsule containing an aqueous solution of a beauty functional substance.

[0046] Microcapsules include:

[0047] Polyurea film;

[0048] An aqueous solution containing cosmetic functional substances; a polyurea film is wrapped around the outside of the aqueous solution containing cosmetic functional substances;

[0049] The thickness of the polyurea film is less than or equal to 700nm;

[0050] The aqueous solution containing cosmetic functional substances contains at least one of water and water-soluble active substances.

[0051] In the above technical solution, the polyurea film is wrapped around the outside of the aqueous solution containing the cosmetic functional substances, which not only effectively wraps the water-soluble active substances, but also gives the water-soluble active substances a unique form, thereby protecting the water-soluble active substances and delaying their release.

[0052] Usually, water-soluble active substances will lose their activity when directly applied to cosmetics. However, when microcapsules containing aqueous solution of cosmetic functional substances are applied to cosmetics, the release of active substances is delayed due to the microcapsule structure, which greatly reduces the loss of activity and thus greatly enhances the efficacy of cosmetics.

[0053] Furthermore, the above technical solution uses a polyurea film to wrap the outside of the aqueous solution containing beauty functional substances, and the thickness of the polyurea film is less than or equal to 700nm, which greatly reduces the thickness of the "shell" of the aqueous solution containing beauty functional substances, and greatly improves the skin feel of consumers. In the prior art, only "hard shell" microcapsules can be made. However, this kind of hard shell microcapsules, when used in cosmetics, have very poor skin feel, and there will be a lot of residues when applied on the skin, which greatly limits the application of this kind of "hard shell" microcapsules. The thickness of the "shell" of this kind of "hard shell" microcapsule is generally in the micron level, usually around 10 microns; or thicker; it can be clearly seen that the "shell" of this kind of "hard shell" microcapsule is hard. However, the "shell" of the microcapsule containing the aqueous solution of beauty functional substances in the present application is nanometer-level, and it does not form a "hard shell"; but a "soft" amorphous film, which is essentially different from the existing "hard shell" and presents a very transparent, soft, amorphous film. The application of the microcapsules containing the aqueous solution of beauty functional substances in the present application in the field of cosmetics can greatly improve the skin feel of the cosmetics while delaying the release of active substances. In addition, this nanoscale "film" leaves no residue after use, greatly expanding the scope of application.

[0054] In some embodiments of the present application, the thickness of the polyurea film is 100 nm to 400 nm.

[0055] In the above technical solution, by setting the thickness of the polyurea film to 100nm to 400nm, the release of active substances can be further delayed while greatly improving the skin feel of the cosmetics. Moreover, this nanoscale "film" leaves no residue after use, greatly expanding the scope of application.

[0056] Illustratively, in some embodiments of the present application, the thickness of the polyurea film is 100nm, 150nm, 200nm, 250nm, 300nm, 310nm, 320nm, 330nm, 340nm, 350nm, 360nm, 370nm, 380nm, 390nm, 400nm, 410nm, 420nm, 430nm, 440nm, 450nm, 460nm, 470nm, 480nm, 490nm, 500nm, 510nm, 520nm, 530nm, 540nm, 550nm, 600nm, 650nm, 700nm or the range between any two of the foregoing values.

[0057] Furthermore, in some embodiments of the present application, the water-soluble active substance is a non-acidic substance.

[0058] In the above technical solution, by setting the water-soluble active substance as a non-acidic substance, the polyurea film can be better wrapped around the outside of the aqueous solution containing the beauty functional substance, which not only effectively wraps the water-soluble active substance, but also gives the water-soluble active substance a unique form, thereby protecting the water-soluble active substance and delaying its release.

[0059] Furthermore, in some embodiments of the present application, the water-soluble active substance includes at least one of glycerin, vitamin C, collagen, polypeptide, and plant extract.

[0060] For example, in some embodiments of the present application, the water-soluble active substance is any one of glycerol or vitamin C; or in some embodiments of the present application, the water-soluble active substance is a mixture of glycerol and vitamin C; the two can be mixed in any proportion.

[0061] For example, in some embodiments of the present application, the water-soluble active substance is a mixture of glycerol, vitamin C, and collagen; or the water-soluble active substance is a mixture of glycerol, vitamin C, and polypeptides; or the water-soluble active substance is a mixture of glycerol, vitamin C, polypeptides, and plant extracts; the various raw materials in the above-mentioned mixtures can be mixed in any proportion.

[0062] Furthermore, in some embodiments of the present application, water includes at least one of pure water and spring water.

[0063] For example, in some embodiments of the present application, water includes: any one of pure water or spring water. Or in some embodiments of the present application, water includes: a mixture of pure water and spring water; the two can be mixed in any proportion.

[0064] Furthermore, in some embodiments of the present application, the polyurea film is a hyperbranched polyurea film.

[0065] In the above technical solution, a hyperbranched polyurea film is used to wrap the outside of the aqueous solution containing cosmetic functional substances, which is further beneficial to obtain a nano-scale ultra-thin, soft, amorphous film, which is beneficial to improving the skin feel of cosmetics and avoiding residue.

[0066] Some embodiments of the present application provide a method for preparing microcapsules containing an aqueous solution of a cosmetic functional substance, comprising:

[0067] Prepare a first solution, the first solution comprising: an aqueous solution containing a beauty functional substance and a first film-forming monomer of a polyurea film;

[0068] preparing a second solution, the second solution comprising: a second film-forming monomer for the polyurea film;

[0069] A pumping device is used to pump out the first solution, and an electrostatic field is set at the pump outlet so that the first solution is charged after being pumped out and enters the electrostatic field. Under the action of the electrostatic field, the first solution drips into the second solution in the form of droplets to form a microcapsule solution;

[0070] The microcapsule solution was allowed to continue to react for more than 1 hour.

[0071] In the above technical solution, the microcapsule solution is allowed to continue to react for more than 1 hour, which can improve the stability of the film shell. The inventors found that in order to obtain a nano-scale polyurea film, it is necessary to react for a certain period of time under elevated temperature conditions so that the less active first monomer and the second monomer form a stable polyurea film.

[0072] Furthermore, in some embodiments of the present application, the second solution includes: a surfactant.

[0073] In the above technical solution, the second solution includes a surfactant, so that the dispersion effect can be improved and a nano-scale polyurea film can be obtained more easily.

[0074] Further, in some embodiments of the present application, the surfactant includes a nonionic surfactant; further, in some embodiments of the present application, the surfactant includes: polyethylene glycol and dipolyhydroxystearate.

[0075] Furthermore, in some embodiments of the present application, the second solution includes: a low-polarity organic solvent.

[0076] Furthermore, in some embodiments of the present application, the second solution includes: 3 g to 12 g of a second film-forming monomer, 0.1 wt% to 2 wt% of a surfactant, and 20 mL to 100 mL of an organic solvent.

[0077] In the above technical solution, the second solution is controlled to include: 3g-12g of the second film-forming monomer, 0.1wt%-2wt% of the surfactant, and 20mL-100mL of the organic solvent. Within this ratio range, a lower concentration is controlled to obtain a nano-scale polyurea film.

[0078] Further, in some embodiments of the present application, the second solution includes: 6 g of a second film-forming monomer, 1.0 wt % of a surfactant, and 50 mL of an organic solvent.

[0079] In other optional embodiments, the second solution includes: 3 g, 4 g, 5 g, 6 g, 7 g, 8 g, 9 g, 10 g, 11 g, 12 g or a range between any two of the foregoing values ​​of the second film-forming monomer;

[0080] 0.1wt%, 0.2wt%, 0.3wt%, 0.4wt%, 0.5wt%, 0.6wt%, 0.7wt%, 0.8wt%, 0.9wt%, 1wt%, 1.2wt%, 1.3wt%, 1.5wt%, 1.8wt%, 2wt% or a range between any two of the foregoing surfactants;

[0081] 20mL, 25mL, 30mL, 40mL, 50mL, 60mL, 70mL, 80mL, 90mL, 95mL, 100mL or an organic solvent in a range between any two of the foregoing values.

[0082] Further, in some embodiments of the present application, a pumping device is used to pump out the first solution, comprising:

[0083] The first solution is pumped out at a rate of less than or equal to 50 mL / h using a pumping device.

[0084] In the above technical solution, the first solution is pumped out at a speed of less than or equal to 50 mL / h by using a pumping device. Within this speed range, it is beneficial to obtain a nano-scale polyurea film.

[0085] For example, in some embodiments of the present application, a pumping device is used to pump out the first solution, comprising:

[0086] Using a pumping device, the first solution is pumped out at a speed of 50 mL / h, 45 mL / h, 40 mL / h, 35 mL / h, 25 mL / h, 20 mL / h, 15 mL / h, 10 mL / h or a range between any two of the foregoing values.

[0087] Furthermore, in some embodiments of the present application, the voltage of the electrostatic field is less than or equal to 30 kV.

[0088] In the above technical solution, by setting the voltage of the electrostatic field to be less than or equal to 30 kV, it is beneficial to obtain a nano-scale polyurea film.

[0089] Exemplarily, in some embodiments of the present application, the voltage of the electrostatic field is 30kV, 29kV, 28kV, 27kV, 26kV, 25kV, 24kV, 23kV, 22kV, 21kV, 20kV, 19kV, 18kV, 17kV, 16kV, 15kV, 10kV or a voltage in a range between any two of the foregoing values.

[0090] Further, in some embodiments of the present application, the microcapsule solution is allowed to continue to react for more than 1 hour, including:

[0091] The microcapsule solution is kept at 30°C-40°C for 1 to 3 hours.

[0092] In the above technical solution, the microcapsule solution is kept reacting at 30° C.-40° C. for 1 to 3 hours, so that the first monomer and the second monomer with lower activity can form a stable nano-scale polyurea film.

[0093] For example, in some embodiments of the present application, the microcapsule solution is allowed to continue to react for more than 1 hour, including:

[0094] The microcapsule solution is stabilized at 30°C, 31°C, 32°C, 33°C, 34°C, 35°C, 36°C, 37°C, 38°C, 39°C, 40°C or a range between any two of the foregoing values, and the reaction is continued for 1 hour, 1.1 hours, 1.2 hours, 1.5 hours, 1.8 hours, 2 hours, 2.2 hours, 2.5 hours, 2.8 hours, 3 hours or a range between any two of the foregoing values.

[0095] Furthermore, in some embodiments of the present application, the method for preparing the above-mentioned microcapsules containing the aqueous solution of beauty functional substances is prepared using an electrostatic spray device.

[0096] Reference Figure 1 , Figure 1 An electrostatic spray device is shown. The electrostatic spray device includes a pumping device, a connecting pipe, a metal nozzle, a receiving container containing a reaction solution, a metal conductor, and a high-voltage power supply connected to the nozzle and a metal plate, wherein an aqueous solution containing various functional components flows out of the nozzle through the pumping device, the high-voltage power supply is turned on to charge the mixed solution and make it fall into the reaction solution in the form of droplets under the action of gravity and the electrostatic field generated by the high-voltage power supply, and the shell-forming monomer in the droplet and another shell-forming monomer in the reaction solution quickly undergo interfacial polymerization reaction on the surface of the droplet to form a polyurea film, and finally form microcapsules containing functional substances.

[0097] Some embodiments of the present application provide a cosmetic, comprising microcapsules containing an aqueous solution of a cosmetic functional substance provided in any of the aforementioned embodiments.

[0098] The above-mentioned cosmetics include microcapsules containing an aqueous solution of cosmetic functional substances provided by any of the aforementioned embodiments. The microcapsule structure delays the release of active substances and greatly reduces the loss of activity, thereby greatly improving the efficacy of the cosmetics.

[0099] Furthermore, the cosmetics are wrapped with polyurea film on the outside of the aqueous solution containing cosmetic functional substances, and the thickness of the polyurea film is less than or equal to 700nm, which greatly reduces the thickness of the "shell" of the aqueous solution containing cosmetic functional substances and greatly improves the skin feel of consumers. Moreover, this nano-scale "film" leaves no residue after use, greatly expanding the scope of application.

[0100] The above technical scheme of the present application microencapsulates the aqueous solution of the cosmetic functional substances, which, on the one hand, gives the aqueous solution of the cosmetic functional substances an independent form to enhance its appearance; on the other hand, it forms a unique protection for the cosmetic functional substances to prevent the cosmetic functional substances from being destroyed by substances in the environment or in the mixed system, and at the same time has the effect of sustained release and prolonged efficacy.

[0101] The features and performance of the present application are further described in detail below in conjunction with the embodiments:

[0102] Example 1

[0103] A microcapsule is provided, which is prepared according to the following steps:

[0104] Preparation and use of aqueous solution microcapsules Figure 1 The device shown. An aqueous solution containing 1.0 wt% polyethyleneimine is added to the pumping device, and a reaction solution containing 50 mL of hexadecane, 6 g of dicyclohexylmethane diisocyanate (HMDI), and 0.5 g of Arlacel P135 is added to the receiving container. After applying a voltage of 8 kV between the nozzle and the metal plate. The aqueous solution is pumped out from the nozzle through the connecting pipe at a rate of 10 mL / h. The aqueous solution at the nozzle is atomized into small droplets under the action of the electrostatic force field. When the small droplets fall into the reaction solution, the polyethyleneimine in the small droplets and the HMDI in the reaction solution undergo a rapid interfacial polymerization reaction, and a polyurea film is formed on the surface of the small droplets to wrap the small droplets, thereby generating water-containing primary microcapsules. The mixture of the primary microcapsules and the reaction solution is placed at 40°C for reaction for 2 hours to obtain the final microcapsules.

[0105] Figure 4 The optical microscope image of the prepared aqueous solution microcapsules is shown. The particle size of the microcapsules is relatively uniform, about 300 μm, and the microcapsules have good dispersibility. Figure 5 The microcapsules are shown in a scanning electron microscope (SEM) image. The microcapsules have a thin and dense polyurea capsule wall and can maintain a spherical shape even in the high vacuum characterization environment of the SEM. Figure 6 Using a scanning electron microscope to observe the cross-sectional view of the microcapsule wall, it can be seen that the thickness of the polyurea capsule wall of the microcapsule is about 400 nm.

[0106] Example 2

[0107] A microcapsule is provided, which is different from Example 1 in that:

[0108] The aqueous solution pumped in is an aqueous solution containing 50.0 wt % glycerol and 1.0 wt % polyethyleneimine.

[0109] Figure 7 The prepared microcapsules containing 50.0 wt% glycerol aqueous solution are shown. Similar to the water-containing microcapsules, the microcapsules have good dispersibility and uniform particle size, about 550 μm. The thickness of the polyurea capsule wall of the microcapsules is about 380 nm.

[0110] Example 3

[0111] A microcapsule is provided, which is different from Example 1 in that:

[0112] The aqueous solution pumped in is an aqueous solution containing 10.0 wt % vitamin C and 1.0 wt % polyethyleneimine.

[0113] Figure 8 The prepared microcapsules containing 10.0 wt% glycerol aqueous solution are shown. Similar to the water-containing microcapsules, the microcapsules have good dispersibility and uniform particle size, with a particle size of about 420 μm. The thickness of the polyurea capsule wall of the microcapsules is about 390 nm.

[0114] Comparative Example 1

[0115] A microcapsule with a hard capsule wall is provided, which is prepared according to the following steps:

[0116] Preparation and use of microcapsules containing pure liquid amine Figure 1The device shown in the figure. Add the pure liquid amine diethylenetriamine (DETA) into the pumping device, and add the reaction solution containing 50mL decalin, 6g dicyclohexylmethane diisocyanate (HMDI), 0.5g Arlacel P135, and 0.5g accelerator triethylenediamine (DABCO) into the receiving container. After applying a voltage of 15kV between the nozzle and the metal plate. Pump DETA out of the nozzle through the connecting pipe at a rate of 10mL / h. The liquid amine at the nozzle is atomized into small droplets under the action of the electrostatic force field. When the small droplets fall into the reaction solution, the DETA in the small droplets and the HMDI in the reaction solution undergo a rapid interfacial polymerization reaction, and a polyurea film is formed on the surface of the small droplets to wrap the small droplets, thereby generating primary microcapsules containing DETA. The mixture of the primary microcapsules and the reaction solution is placed at 40°C for reaction for 2h to obtain the final microcapsules.

[0117] Figure 2 The following is a scanning electron microscope image of microcapsules containing DETA. The particle size of the microcapsules is about 100 microns, which is relatively small. The microcapsules have thicker capsule walls, which are about 10 μm. If the microcapsules with thicker capsule walls are used as carriers for cosmetic products, they will leave a lot of residues on the human body surface, greatly affecting the sensory experience of consumers. Figure 3 for Figure 2 The morphology of the thick-walled microcapsules after crushing is shown, which leave a lot of residue on the surface of the glass sheet.

[0118] In summary, the microcapsules prepared in the embodiments of the present application have a thinner and softer "shell" without any residue and have a better skin feel.

[0119] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A microcapsule containing an aqueous solution of a cosmetic functional substance, characterized in that: The microcapsules include: Polyurea film; An aqueous solution containing a beauty and cosmetic functional substance; the polyurea film is wrapped around the outside of the aqueous solution containing a beauty and cosmetic functional substance; The thickness of the polyurea film is less than or equal to 700 nm; The aqueous solution containing cosmetic functional substances comprises at least one of water and water-soluble active substances.

2. The microcapsule containing the aqueous solution of the beauty functional substance according to claim 1, characterized in that: The thickness of the polyurea film is 100nm-400nm.

3. The microcapsule containing an aqueous solution of a beauty functional substance according to any one of claims 1 or 2, characterized in that: The water-soluble active substance is a non-acidic substance; Optionally, the water-soluble active substance includes at least one of glycerin, vitamin C, collagen, polypeptide, and plant extract; Optionally, the water includes: at least one of pure water and spring water; Optionally, the polyurea film is a hyperbranched polyurea film.

4. The method for preparing microcapsules containing aqueous solution of beauty functional substances according to any one of claims 1 to 3, characterized in that: include: Prepare a first solution, wherein the first solution comprises: an aqueous solution containing a beauty functional substance and a first film-forming monomer of a polyurea film; preparing a second solution, wherein the second solution comprises: a second film-forming monomer for the polyurea film; A pumping device is used to pump out the first solution, and an electrostatic field is set at the pump outlet, so that the first solution is charged after being pumped out and enters the electrostatic field. Under the action of the electrostatic field, the first solution drips into the second solution in the form of droplets to form a microcapsule solution; The microcapsule solution was allowed to continue to react for more than 1 hour.

5. The method for preparing microcapsules containing aqueous solution of beauty functional substances according to claim 4, characterized in that: include: The second solution includes: a surfactant; Optionally, the surfactant includes a nonionic surfactant; optionally, the surfactant includes polyethylene glycol and dipolyhydroxystearate.

6. The method for preparing microcapsules containing aqueous solution of beauty functional substances according to claim 4, characterized in that: include: The second solution includes: a low-polarity organic solvent.

7. The method for preparing microcapsules containing aqueous solution of beauty functional substances according to claim 4, characterized in that: include: The second solution comprises: 3g-12g of a second film-forming monomer, 0.1wt%-2wt% of a surfactant, and 20mL-100mL of an organic solvent; Optionally, the second solution includes: 6 g of a second film-forming monomer, 1.0 wt % of a surfactant, and 50 mL of an organic solvent.

8. The method for preparing microcapsules containing aqueous solution of cosmetic functional substances according to any one of claims 4 to 7, characterized in that: include: The method of using a pumping device to pump out the first solution comprises: Using a pumping device, pumping out the first solution at a rate of less than or equal to 50 mL / h; Optionally, the voltage of the electrostatic field is less than or equal to 30 kV.

9. The method for preparing microcapsules containing aqueous solution of cosmetic functional substances according to any one of claims 4 to 7, characterized in that: include: The microcapsule solution is allowed to continue to react for more than 1 hour, comprising: The microcapsule solution is kept reacting at 30° C.-40° C. for 1 to 3 hours.

10. A cosmetic, characterized in that: A microcapsule comprising an aqueous solution containing a cosmetic functional substance as described in any one of claims 1 to 9.

Images