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

Abstract

The present application provides a microcapsule containing an aqueous solution of a cosmetic functional substance, a preparation method thereof, and cosmetics. The microcapsule includes: a polyurea film; an aqueous solution containing a cosmetic functional substance; the polyurea film is wrapped around the outside of the aqueous solution containing the cosmetic functional substance; the thickness of the polyurea film is less than or equal to 700 nm; the aqueous solution containing the cosmetic functional substance contains at least one of water and water-soluble active substances. The polyurea film is wrapped around the outside of the aqueous solution containing the cosmetic functional substance, which not only effectively wraps the water-soluble active substance, but also gives the water-soluble active substance a unique form, protects the water-soluble active substance, and delays its release, which can greatly enhance the efficacy of the cosmetic. Furthermore, the above technical solution uses a polyurea film to wrap around the outside of the aqueous solution containing the cosmetic functional substance, and makes the thickness of the polyurea film less than or equal to 700 nm, which greatly reduces the thickness of the "shell" of the aqueous solution containing the cosmetic functional substance and enhances the skin feel of consumers when using it.

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] Cosmetics often contain large amounts of water and corresponding water-soluble functional substances. These substances, under the action of surfactants, mix with other water-insoluble substances to form heterogeneous systems. These heterogeneous systems can remain stable for a certain period of time. However, with extended storage, these heterogeneous systems gradually become unstable, resulting in significant changes in the system's appearance and functionality.

[0003] After the functional beauty 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 to microencapsulation of oil-soluble substances, microencapsulation of water-soluble substances is relatively more difficult. Microencapsulation of water-soluble substances is generally performed using the inverse emulsion method, but the microcapsules produced by this method are of poor quality and have a large particle size dispersion. They are generally used to prepare microcapsules with hard walls. Microencapsulation of water-soluble substances can also be performed using microfluidics, 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 cosmetic functional substance.

[0008] Microcapsules include:

[0009] Polyurea film;

[0010] An aqueous solution containing a cosmetic functional substance; a polyurea film wrapped around the exterior of the aqueous solution containing the cosmetic functional substance;

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

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

[0013] In the above technical solution, the polyurea film is 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, protects the water-soluble active substance, and delays its release. When the microcapsules containing the aqueous solution of the beauty functional substance are applied to cosmetics, the microcapsule structure delays the release of the active substance, greatly reducing the loss of activity, thereby greatly improving the efficacy of the cosmetics. Furthermore, the above technical solution uses a polyurea film to wrap around the outside of the aqueous solution containing the beauty functional substance, and makes the thickness of the polyurea film less than or equal to 700nm, which greatly reduces the thickness of the "shell" of the aqueous solution containing the beauty functional substance, and greatly improves the skin feel of consumers. Compared with the micron-level "hard shell" microcapsules in the current existing technology, the skin feel of the 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, the first solution comprising: an aqueous solution containing a cosmetic 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 reacting for more than 1 hour, comprising:

[0032] The microcapsule solution is kept at 30° C.-40° C. and the reaction is continued 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 as provided in any one of the first or second aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. 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 relevant drawings can be obtained based on these drawings without creative work.

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

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

[0037] 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;

[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 thin and dense polyurea capsule walls and can maintain a spherical shape even under the high vacuum characterization environment of the SEM;

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

[0041] Figure 7 This is an optical microscope image 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 making creative efforts are within the scope of protection of this application.

[0045] The embodiment of 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 a cosmetic functional substance; a polyurea film wrapped around the exterior of the aqueous solution containing the cosmetic functional substance;

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

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

[0051] In the above technical solution, the polyurea film is wrapped around the outside of the aqueous solution containing cosmetic functional substances, which not only effectively encapsulates 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 applied directly to cosmetics. However, when microcapsules containing aqueous solutions 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 improves the efficacy of the cosmetics.

[0053] Furthermore, the above-mentioned technical solution uses a polyurea film wrapped around the exterior of the aqueous solution containing cosmetic functional substances, with a thickness of 700 nm or less. This significantly reduces the thickness of the "shell" of the aqueous solution containing cosmetic functional substances, significantly improving the skin feel when used by consumers. Prior art currently only allows for "hard-shell" microcapsules. However, these hard-shell microcapsules, when used in cosmetics, have a very poor skin feel and leave a lot of residue on the skin after application, significantly limiting their application. The "shell" of these "hard-shell" microcapsules is generally micrometer-level thick, usually around 10 microns or thicker. These "hard-shell" microcapsules clearly demonstrate a hard shell. However, the "shell" of the microcapsules containing the aqueous solution containing cosmetic functional substances in this application is nanometer-level, forming not a "hard shell" but a "soft," amorphous film. This is fundamentally different from existing "hard shells," presenting a very transparent, soft, amorphous film. The application of the microcapsules containing the aqueous solution of cosmetic functional substances in the present application in the cosmetics field can greatly improve the skin feel of the cosmetics while delaying the release of active substances. In addition, this nano-scale "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. In addition, this nano-scale "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 100 nm, 150 nm, 200 nm, 250 nm, 300 nm, 310 nm, 320 nm, 330 nm, 340 nm, 350 nm, 360 nm, 370 nm, 380 nm, 390 nm, 400 nm, 410 nm, 420 nm, 430 nm, 440 nm, 450 nm, 460 nm, 470 nm, 480 nm, 490 nm, 500 nm, 510 nm, 520 nm, 530 nm, 540 nm, 550 nm, 600 nm, 650 nm, 700 nm, or a 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 to a non-acidic substance, the polyurea film can be better wrapped around the outside of the aqueous solution containing the cosmetic functional substance. This 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 either 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 polypeptide; or the water-soluble active substance is a mixture of glycerol, vitamin C, polypeptide, and plant extract; the raw materials in the above mixtures can be mixed in any proportion.

[0062] Furthermore, in some embodiments of the present application, the 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 and spring water. Alternatively, 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 conducive to obtaining a nano-level 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 cosmetic 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] The above technical solution allows the microcapsule solution to continue reacting for more than one hour, which can improve the stability of the film shell. The inventors have discovered that to obtain a nanoscale polyurea film, it is necessary to react for a certain period of time under elevated temperature conditions to allow the less active first monomer and second monomer to 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, which can improve the dispersion effect and make it easier to obtain a nano-scale polyurea film.

[0074] Furthermore, 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] Furthermore, 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] 0.1 wt%, 0.2 wt%, 0.3 wt%, 0.4 wt%, 0.5 wt%, 0.6 wt%, 0.7 wt%, 0.8 wt%, 0.9 wt%, 1 wt%, 1.2 wt%, 1.3 wt%, 1.5 wt%, 1.8 wt%, 2 wt% or a range between any two of the foregoing surfactants;

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

[0082] Furthermore, 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] The first solution is pumped out using a pumping device 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] Illustratively, 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] Furthermore, in some embodiments of the present application, the microcapsule solution is allowed to continue reacting for more than 1 hour, comprising:

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

[0092] In the above technical solution, the microcapsule solution is kept at 30° C.-40° C. and the reaction is continued 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 reacting for more than 1 hour, comprising:

[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 device includes a pumping device, connecting pipes, 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. An aqueous solution containing various functional ingredients flows out of the nozzle through the pumping device. The high-voltage power supply is turned on to charge the mixed solution, causing it to fall into the reaction solution in the form of droplets under the influence of gravity and the electrostatic field generated by the high-voltage power supply. Shell-forming monomers in the droplets and another shell-forming monomer in the reaction solution rapidly undergo interfacial polymerization on the surface of the droplets to form a polyurea film, ultimately forming microcapsules containing the functional substances.

[0097] Some embodiments of the present application provide a cosmetic comprising microcapsules containing an aqueous solution of a cosmetic functional substance provided by 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, cosmetics are coated with a polyurea film around the aqueous solution containing cosmetic functional substances, with a thickness of 700 nm or less. This significantly reduces the thickness of the "shell" of the aqueous solution containing cosmetic functional substances, significantly improving the skin feel of consumers. Furthermore, this nanoscale "film" leaves no residue after use, greatly expanding its application range.

[0100] The above technical solution of the present application microencapsulates the aqueous solution of the cosmetic functional substance. On the one hand, it gives the aqueous solution of the cosmetic functional substance an independent form, enhancing its appearance; on the other hand, it forms a unique protection for the cosmetic functional substance, preventing the cosmetic functional substance 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 invention are further described in detail below with reference to the embodiments:

[0102] Example 1

[0103] A microcapsule 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, forming a polyurea film on the surface of the small droplets to wrap the small droplets, thereby forming water-containing primary microcapsules. The mixture of the primary microcapsules and the reaction solution is placed at 40°C for 2 hours to obtain the final microcapsules.

[0105] Figure 4 Shown is an optical microscope image of the prepared microcapsules containing an aqueous solution. The microcapsules are relatively uniform in size, approximately 300 μm, and have good dispersion. Figure 5 The microcapsules are shown in a scanning electron microscope (SEM) image. The microcapsules have a thin and dense polyurea wall and can maintain their spherical shape even under the high vacuum environment of the SEM. Figure 6 The cross-sectional view of the microcapsule wall was observed using a scanning electron microscope. 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 microcapsules prepared contain a 50.0 wt% aqueous glycerol solution. Similar to the aqueous microcapsules, the microcapsules are well dispersed and have a uniform particle size of approximately 550 μm. The polyurea wall thickness of the microcapsules is approximately 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 microcapsules prepared contain a 10.0 wt% aqueous glycerol solution. Similar to the aqueous microcapsules, the microcapsules are well dispersed and have a uniform particle size of approximately 420 μm. The polyurea wall thickness of the microcapsules is approximately 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 apparatus shown in the figure. Pure liquid amine diethylenetriamine (DETA) is added to the pumping device, and a reaction solution containing 50 mL of decalin, 6 g of dicyclohexylmethane diisocyanate (HMDI), 0.5 g of Arlacel P135, and 0.5 g of the accelerator triethylenediamine (DABCO) is added to the receiving container. After applying a voltage of 15 kV between the nozzle and the metal plate, DETA is pumped out of the nozzle through the connecting pipe at a rate of 10 mL / h. The liquid amine at the nozzle is atomized into small droplets under the action of the electrostatic field. When the droplets fall into the reaction solution, the DETA in the droplets undergoes a rapid interfacial polymerization reaction with the HMDI in the reaction solution, forming a polyurea film on the surface of the droplets, which encapsulates the droplets and produces primary microcapsules containing DETA. The mixture of the primary microcapsules and the reaction solution is reacted at 40°C for 2 hours to obtain the final microcapsules.

[0117] Figure 2 Shown is a scanning electron microscope image of DETA-containing microcapsules. These microcapsules are relatively small, approximately 100 microns in size. They also have thick walls, approximately 10 μm. If these thick-walled microcapsules were used as carriers for cosmetics, they would leave a significant amount of residue on the human body, significantly impacting the consumer's sensory experience. 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 slide.

[0118] In summary, the microcapsules prepared in the examples of the present application have a thinner and softer "shell", leave no residue, and have a better skin feel.

[0119] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection 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; the monomers forming the polyurea film include polyethyleneimine; An aqueous solution containing a cosmetic functional substance; the polyurea film is wrapped around the outside of the aqueous solution containing a 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 an aqueous solution of a cosmetic functional substance according to claim 1, characterized in that: The thickness of the polyurea film is 100 nm to 400 nm.

3. The microcapsule containing an aqueous solution of a cosmetic functional substance according to claim 1 or 2, characterized in that: The water-soluble active substance is a non-acidic substance.

4. The microcapsule containing an aqueous solution of a cosmetic functional substance according to claim 1 or 2, characterized in that: The water-soluble active substance includes at least one of glycerin, vitamin C, collagen, polypeptide, and plant extract.

5. The microcapsule containing an aqueous solution of a cosmetic functional substance according to claim 1 or 2, characterized in that: The water includes at least one of pure water and spring water.

6. The microcapsule containing an aqueous solution of a cosmetic functional substance according to claim 1 or 2, characterized in that: The polyurea film is a hyperbranched polyurea film.

7. The method for preparing microcapsules containing an aqueous solution of a cosmetic functional substance according to any one of claims 1 to 6, characterized in that: include: Prepare a first solution, the first solution comprising: an aqueous solution containing a cosmetic functional substance and a first film-forming monomer for a polyurea film; the first film-forming monomer is polyethyleneimine; preparing a second solution, the second solution comprising: 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 is allowed to continue reacting for more than 1 hour.

8. The method for preparing microcapsules containing an aqueous solution of a cosmetic functional substance according to claim 7, characterized in that: include: The second solution includes a surfactant.

9. The method for preparing microcapsules containing an aqueous solution of a cosmetic functional substance according to claim 8, characterized in that: include: The surfactant includes a nonionic surfactant.

10. The method for preparing microcapsules containing an aqueous solution of a cosmetic functional substance according to claim 8, characterized in that: include: The surfactant includes polyethylene glycol and dipolyhydroxystearate.

11. The method for preparing microcapsules containing an aqueous solution of a cosmetic functional substance according to claim 7, characterized in that: include: The second solution includes: a low-polarity organic solvent.

12. The method for preparing microcapsules containing an aqueous solution of a cosmetic functional substance according to any one of claims 7 to 11, characterized in that: include: The method of pumping out the first solution by using a pumping device comprises: The first solution is pumped out at a rate of less than or equal to 50 mL / h using a pumping device.

13. The method for preparing microcapsules containing an aqueous solution of a cosmetic functional substance according to any one of claims 7 to 11, characterized in that: include: The voltage of the electrostatic field is less than or equal to 30 kV.

14. The method for preparing microcapsules containing an aqueous solution of a cosmetic functional substance according to any one of claims 7 to 11, characterized in that: include: The microcapsule solution is allowed to continue reacting for more than 1 hour, comprising: The microcapsule solution is kept at 30° C.-40° C. for 1 to 3 hours.

15. A cosmetic, characterized in that: The microcapsules include the aqueous solution containing cosmetic functional substances according to any one of claims 1 to 6; or the cosmetics include microcapsules prepared by the method for preparing microcapsules containing the aqueous solution containing cosmetic functional substances according to any one of claims 7 to 14.

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