KR20140117954A - Active cosmetic patch based on cellulose - Google Patents

Abstract

The present invention relates to a cosmetic patch which includes cellulose film, at least one zinc oxide part, and at least one counter electrode. The zinc oxide part and the counter electrode are formed on the surface of the cellulose film. The zinc oxide part and the counter electrode come in contact with the surface of the skin, and a potential difference is generated by n-type semiconductor properties of a zinc oxide nanorod and insulating properties of the cellulose film. A self-generated micro current flows along the skin where the zinc oxide part and the counter electrode touch to obtain effects of skin care and skin regeneration treatment. The present invention also relates to a method for manufacturing the disclosed cosmetic patch.

Description

[0001] ACTIVE COSMETIC PATCH BASED ON CELLULOSE [0002]

The present invention relates to one or more field-generating environmentally friendly nanocomposites that can be used for topical or cosmetic systems and skin treatments, and to devices containing such compositions and their application in therapeutic and cosmetic applications.

The skin of mammals has normal transcutaneous electrical potential (see, for example, Robert Edelberg, The Biophysical Properties of the Skin, Harry Elden ed., Ch. 15, Wiley Interscience, 1971). Since these dislocations are greatly influenced by the presence of sweat glands and hair, the intensity of the dislocations may vary with space and time on the skin. However, even in the unconventional part of the skin, there is a strong and measurable current that is produced across the epidermis, which essentially forms a unique skin battery. Although most of the measurements were performed in mammals other than humans, considerable evidence exists in human skin in the same form (Barker et al., Am. J. Physiol. 242: R358-R366, 1982). Such batteries are known to be present in amphibians, and they apparently perform sodium absorption and appendage regeneration functions, but are not readily apparent in non-aquatic vertebrates. Based on the observation of a fairly strong voltage gradient at the wound edge, Barker et al. Suggested that skin currents in mammals may be important in the wound healing process.

The fact that current is important in maintaining healthy skin can be seen in the results of successful electrotherapy when treating skin damage. Electrophoretic treatment of low-intensity dc flow to ulcer sites has reduced the pain and discomfort of ulcers and improved the cure rate (Carley, Wainapel, Arch. Phys. Med. Rehabil., 66: 443-446, 1985). DC electric fields are effective in the process of ligament fibroblast migration and wound healing (Grace Chao et al., Connective Tisue Research, 48: 188, 2007). Treatment of epidermal skin wounds is stimulated by external currents (Alvarez O. M. et al., J. Invest. Dermatol., 81 (2), 144-148, 1983).

Thus, the maintenance of current in the skin is related to the sustained maintenance of the intact skin, and the application of current to the damaged skin can be very beneficial for the treatment of damaged skin. This technique can be applied not only for the treatment of ulcers, but also for many skin conditions accompanied by inflammation. However, the means of delivering current to the skin typically uses external power and monitoring devices, which are painful, irritating, expensive and complex disadvantages for the user.

Although skin patches characterized by very thin power supplies and electrodes printed or laminated onto flexible plastic substrates have been commercially available in recent years, such skin patches are often used to help transdermal delivery of active cosmetic or pharmaceutical ingredients to the skin It was designed. Conventional skin patches are used for transdermal delivery of active cosmetic or pharmaceutical ingredients to the skin and include a very thin microbattery printed in conjunction with an anode and a cathode in direct contact with the skin surface. The electrical potential difference between the cathode and the anode, supplied from the micro-battery, generates an electric current flowing from the anode through the skin to the cathode, which again generates a repulsive electromotive force against the charged active cosmetic or pharmaceutical ingredient on the surface of the skin, The anode will push the positively charged active cosmetic or pharmaceutical ingredient into the skin and the negatively charged cathode will push the negatively charged active cosmetic or pharmaceutical ingredient into the skin.

However, the current intensity achieved by such existing skin patches is typically in the milli-amperes (mA) range, which can cause skin irritation or inflammation. In addition, because the current generated by such existing skin patches flows through the skin, the current intensity can vary widely from person to person, such as pH, moisture content, and skin resistance, even at the same person at different times of the day It is heavily influenced by various factors. In addition, existing skin patches significantly increase the complexity and cost of manufacture and still require the presence of a power source in which there are additional types of failures.

Korean Patent Publication No. 2012-0028978 discloses a local or cosmetic system including metal and semiconductor elements. A beauty device in which a metal element portion and a semiconductor material are in direct contact with the skin is disclosed. Actual beauty patches are being actively pursued to improve skin by utilizing electrical performance. Penton Media has developed and launched a mask pack for skin beauty improvement that includes batteries based on paper materials. ELC Management LLC Has registered intellectual property rights of the beauty system that generates microcurrent in Korea. In addition, VOMARIS has developed a product that utilizes a micro cell battery to create an electric field on the skin and utilize the skin improvement effect.

As described above, the flexible plastic-based cosmetic patches studied so far have a merit of being flexible, but they are disadvantageous in that industrial wastes are produced because they are expensive to manufacture and do not have biodegradability.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a high-performance eco-friendly beauty patch that facilitates skin regeneration and treatment by generating a potential difference by itself,

The cosmetic patch according to the present invention is characterized in that it comprises a cellulose film, at least one zinc oxide part and at least one counter electrode, and the zinc oxide part and the counter electrode are formed on one surface of the cellulose film.

Preferably, the zinc oxide part is composed of a plurality of zinc oxide nanorods formed by growing zinc oxide nanoparticles.

Preferably, the plurality of zinc oxide nanorods are arranged in a predetermined direction.

Preferably, the counter electrode is one selected from the group consisting of platinum, gold, silver, nickel, chromium, and aluminum, more preferably the counter electrode is platinum.

Preferably, the thickness of the cellulose film is 10 to 100 mu m. More preferably 20 to 40 占 퐉.

Preferably, the zinc oxide nanoparticles have a size of 50 to 100 nm and the zinc oxide part has a thickness of 300 to 700 nm. More preferably, the thickness of the zinc oxide part is 500 nm.

Preferably, chitosan is applied to the surface of the cellulose film on which zinc oxide is not formed.

In addition, the method for manufacturing a cosmetic patch according to the present invention comprises the steps of: preparing a cellulose film;

Forming a zinc oxide seed on one surface of the cellulose film; Forming a zinc oxide part composed of zinc oxide nanorods grown with zinc oxide nanoparticles using the zinc oxide seed; And forming a counter electrode on the surface of the cellulose film on which the zinc oxide part is formed.

Preferably, the forming of the counter electrode is performed by applying various metal thin films or spraying a metal nanowire, a carbon nanotube, and a graphene.

The present invention provides a cosmetic patch that regenerates and combines cellulose such as cotton fiber, which is an environmentally friendly high-functional natural polymer material, generates a self-generated current, and has biodegradability and biocompatibility.

In addition, the present invention provides a highly functional cosmetic patch that does not contain a battery or cause skin damage due to an overcurrent.

1 is a view showing a beauty patch according to an embodiment of the present invention.
2 is a view showing an arrangement of a counter electrode and a zinc oxide part as a cosmetic patch according to an embodiment of the present invention.
3 is a diagram showing the potential difference generated in the zinc oxide-cellulose nanocomposite.

Unless defined otherwise, all technical terms used in the present invention have the following definitions and are consistent with the meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Also, preferred methods or samples are described in this specification, but similar or equivalent ones are also included in the scope of the present invention.

Throughout this specification, the words " comprising " and " comprising ", unless the context clearly requires otherwise, include the steps or components, or groups of steps or elements, And that they are not excluded.

The present invention relates to a cosmetic patch comprising a cellulose film, at least one zinc oxide part and at least one counter electrode, wherein the zinc oxide part and the counter electrode are formed on one surface of the cellulose film, and a method for manufacturing the same.

Wherein the zinc oxide part is composed of a plurality of zinc oxide nanorods formed by growing zinc oxide nanoparticles, the zinc oxide nanorods are arranged at a ratio of 100 to 400 / μm ² per the area of the cellulose film, and the zinc oxide nanorods The greater the potential difference is.

Preferably, the thickness of the cellulose film may be 10 to 100 mu m. More preferably 20 to 40 mu m.

Preferably, the zinc oxide nanoparticles may have a size of 50 to 100 nm and the zinc oxide part may have a thickness of 300 to 700 nm. More preferably, the thickness of the zinc oxide part may be 500 nm.

Preferably, the plurality of zinc oxide nanorods may be arranged in a predetermined direction.

FIG. 1 is a view showing a beauty patch according to an embodiment of the present invention, and FIG. 2 is a view showing an arrangement of a counter electrode and a zinc oxide part with a cosmetic patch according to an embodiment.

1 and 2, a zinc oxide part 12 and a counter electrode 13 constituted of a plurality of zinc oxide nanorods are disposed on the surface of the cellulose film 11 and contact with the skin surface 14.

3 is a diagram showing the potential difference generated in the zinc oxide-cellulose nanocomposite. Referring to FIG. 3, the free electrons are concentrated on the zinc oxide part 12 due to the N-type semiconductor characteristics of the zinc oxide nanorods and the insulating property of the cellulose film 11, thereby generating a large potential difference. Due to the potential difference, a self-fine current flows along the skin 14 in which the zinc oxide part 12 and the counter electrode 13 are in direct contact with each other. Therefore, it is possible to obtain the effect of treating skin beauty and skin regeneration.

2 is a view showing an arrangement of a counter electrode and a zinc oxide part as a cosmetic patch according to an embodiment of the present invention.

The counter electrode 13 may be one selected from the group consisting of platinum, gold, silver, nickel, chromium, and aluminum. Preferably, the counter electrode 13 may be platinum. The potential difference may vary depending on the type of the counter electrode 13. [

Referring to FIG. 2, the zinc oxide part 12 and the counter electrode 13 can be arranged in various forms. The potential difference and the magnitude of the microcurrent may vary depending on the size of the zinc oxide part 12, the size and the interval of the counter electrode 13, and the like.

On the other hand, when there is an exudate in a skin wound, more current may flow through the exudate, so that the micro factors can be adjusted so that a micro current flows.

Preferably, when the chitosan is coated on the surface of the cellulose film 11 on which the zinc oxide is not formed, the biocompatibility can be further improved and an antimicrobial effect can be obtained.

Preferably, the surface of the cellulose film 11 on which the zinc oxide 12 is formed may comprise a topical or cosmetic composition formulated with a pharmaceutical or cosmetically acceptable carrier. The term " pharmaceutical or cosmetically acceptable carrier "refers to a carrier for pharmaceutical or cosmetic purposes that will deliver the active ingredient to the intended target and will not cause harm to humans or other recipient organisms. As used herein, "pharmaceutical" or "cosmetic" will be understood to encompass pharmaceutical or cosmetic formulations for both humans and animals. The carrier may be provided in any form convenient for topical application to the skin. Such forms include, but are not limited to, gels, creams, dispersions, emulsions (water-in-oil or water-in-oil), suspensions, lotions, foams, mousses, and the like. By delivering a topical or aesthetic agent to the user's skin in a cellulosic film, current therapy and topical or cosmetic composition treatment (e.g., moisturizing, hydrating, etc.) can be provided

In addition,

Preparing a cellulose film (11); Generating zinc oxide on one surface of the cellulose film (11); Forming a zinc oxide part (12) composed of zinc oxide nanorods grown with zinc oxide nanoparticles using the zinc oxide seed; And forming a counter electrode (13) on the surface of the cellulose film (11) on which the zinc oxide part (12) is formed.

The step of preparing the cellulose film (11) can be carried out by a conventionally known method. For example, by dissolving cellulose pulp to prepare a cellulose solution, then spin-coating the cellulose solution, or casting the cellulose solution through a doctor blade. Concretely, a solution of sodium hydroxide, DMAc (N, N-dimethylacetamide) or NMMO (N-methylmorpholine-N-oxide) is added to bulk cellulose to prepare a cellulose solution. The cellulose solution may be subjected to spin coating, extrusion or casting to obtain a cellulose film.

The step of forming zinc oxide on one surface of the cellulose film 11 may be carried out by a method selected from the group consisting of a precoating method, a blending method and a direct coating method.

The first method is the precoating method. First, an aqueous solution containing a zinc source and an amine group is prepared. Next, the cellulose film is added to the solution and stirred at a temperature of 40 ° C to 90 ° C for 1 to 12 hours to form zinc oxide on the surface, inside, or on the surface and inside of the cellulose film. And more preferably at a temperature of 50 캜 to 80 캜 for 3 to 10 hours to produce zinc oxide.

The zinc source used in the formation of the seeds may be zinc nitrate hexahydrate, zinc nitrate monohydrate, zinc citrate, zinc acetate, zinc acetate dihydrate, zinc bromide, zinc bromide anhydride, zinc chloride, zinc fluoride, zinc iodide, ≪ / RTI > However, the present invention is not limited thereto, and any material capable of supplying zinc can be preferably used in the present invention.

Preferably, the zinc source is contained in an amount of 0.01% to 5% by weight, preferably 0.1% to 3% by weight, based on the total weight of the aqueous solution.

The amine group used in the present invention is preferably selected from the group consisting of triethanolamine, triethylamine, hexamethylenetetramine, ammonia, ammonium hydroxide, sodium hydroxide, potassium hydroxide, ethanolamine, and mixtures thereof. However, it is not limited thereto, and any salt containing an amine group can be preferably used in the present invention.

Preferably, the salt is contained in an amount of 0.01 wt% to 5 wt%, preferably 0.1 wt% to 3 wt%, based on the total weight of the aqueous solution.

The second method is a method of generating zinc oxide by blending. After the organic solvent and the surfactant are mixed, ultrasonic agitation is performed for 1 to 3 hours. The organic solvent and the surfactant may be mixed in a weight ratio of 1: 3 to 1:10, and more preferably 1: 5 to 1: 7. The organic solvent may be selected from the group consisting of dimethylacetamide (DMAc), acetone, cyclohexanone, 1-methyl-2 pyrrolidinone (NMP) Examples of the surfactant include sodium dodecyl sulfate (SDS), linear sodium alkyl benzene sulfonate (LAS), alcohol ethoxylate (AE), and the like. Next, 100 mg of zinc oxide nanoparticles are added to the mixed solution, and the mixture is stirred for 1 to 3 hours with ultrasonic waves. 15 ml of the cellulose solution is added to the thus obtained zinc oxide / DMAc solution and stirred at a temperature of 50 to 90 ° C for 1 to 5 hours to mix the cellulose solution and the zinc oxide / DMAc solution. More preferably at a temperature of 60 ° C to 80 ° C for 2 to 4 hours. The mixed solution is subjected to a casting process and a washing process with water to produce zinc oxide on the surface and inside of the cellulose film.

The third method is a zinc oxide seeding method by direct application. A mixed solution is prepared by mixing a zinc source and a solvent, which is then applied onto a dried cellulose film to form a seed. Examples of the application method include a drop method for dropping the mixed solution using a dropper, a blade method for uniformly dispersing the dropped mixed solution using a uniform glass or doctor blade, There is a spin coating method in which a mixed solution to be applied is applied by using a spin coater. All coating methods are repeatedly applied one to ten times and zinc oxide is formed on the surface of the cellulose film under a temperature of 70 to 150 캜. It is more preferable that the temperature is 80 ° C to 130 ° C. After the seed is formed, the remaining solution is volatilized and maintained at the same temperature for 10 minutes to 2 hours.

The zinc source used in the seed formation in this method can be used in the same manner as the zinc source used in the method by the precoating. And is preferably selected from the group consisting of zinc nitrate hexahydrate, zinc nitrate monohydrate, zinc citrate, zinc acetate, zinc acetate dihydrate, zinc bromide, zinc bromide anhydride, zinc oxide, zinc fluoride, zinc iodide and mixtures thereof Can be used. However, the present invention is not limited thereto, and any material capable of supplying zinc can be preferably used in the present invention.

Preferably, the zinc source is contained in an amount of 0.05 wt% to 10 wt%, preferably 0.5 wt% to 7 wt%, based on the total weight of the solvent.

The solvent is preferably selected from a solution having ethanol, methanol and an alkyl group (C _n H _{2n +1} ). However, the solvent is not limited thereto, and any solvent capable of reacting with a zinc source to form a hydroxyl group (OH) is not particularly limited and can be preferably used.

The steps of forming the zinc oxide part composed of the zinc oxide nanorods are as follows.

The cellulose film from which zinc oxide is formed is placed in an aqueous solution containing an amine group in a zinc source. The aqueous solution is stirred at 60 ° C to 90 ° C for 2 hours to 10 hours to effectively grow the zinc oxide nanorods densely on the basis of zinc oxide on the cellulose surface to form a zinc oxide part.

It is preferable that each of the salts containing the zinc source and the amine group is contained in the aqueous solution in an amount of 0.01 wt% to 5 wt% based on the total weight of the aqueous solution.

In the method of manufacturing a beauty patch of the present invention, formation and growth of zinc oxide nanorods are performed as follows.

The zinc amine complex salt is formed by the reaction of a salt containing an amine group with a zinc source. Next, when the temperature is raised, zinc hydroxide is formed. The zinc hydroxide forms very small zinc oxide particles on or in the cellulose surface, and these zinc oxide particles serve as seeds. These small particles gather to form nano-sized zinc oxide. In the case of bases such as sodium hydroxide or potassium hydroxide, zinc hydroxide is directly formed and then the temperature is raised to form nanoparticles through hydrolysis. The particle size of the zinc oxide is determined by the reaction temperature, time, zinc concentration, acidity and the like. In the case of a base, nanoparticles are formed by directly forming zinc hydroxide and then raising the temperature.

The formation of zinc oxide nanorods by hydrothermal synthesis based on zinc oxide seeds is influenced by additional chemicals such as organic ligands, metal ion impurities, pH acidity, etc. (Nature Materials, 10 (9), p596- 601, August 2011]). Growth of zinc oxide nanorods is dominantly influenced by face-selective electrostatic interactions (Crystal Growth and Design, 9, p2570-2575, 2009). Growth of zinc oxide nanorods can be grown in the form of rods by controlling the local reaction environment in the growth process by adding amine groups to the zinc oxide source. The amine group produces a charge-free but reactive complex that forms an oppositely charged portion on the surface of the zinc oxide crystal, thereby controlling the adhesion of the highly reactive zinc material to the crystal surface, thereby helping to grow into nanorods.

The zinc oxide nanoparticles have a size of 50 nm to 100 nm, and the thickness of the zinc oxide part made of zinc oxide nanorods grown in a rod shape is 300 nm to 700 nm.

Preferably, the thickness of the zinc oxide part is 500 nm.

The forming of the counter electrode may be performed by applying various metal thin films or by spraying metal nanowires, carbon nanotubes, and graphenes.

The cosmetic patch according to the present invention may have various shapes.

The shape of the beauty patch may be a shape adapted to the shape of the front face such as forehead, nose, ball and jaw, and may be a shape that covers the entire face.

The present invention has been described with reference to the preferred embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

11: Cellulose film
12: zinc oxide part
13: counter electrode
14: Skin surface
100: beauty patch

Claims (9)

A cellulose film, at least one zinc oxide part and at least one counter electrode, wherein the zinc oxide part and the counter electrode are formed on one surface of the cellulose film. The cosmetic patch according to claim 1, wherein the zinc oxide part comprises a plurality of zinc oxide nanorods formed by growing zinc oxide nanoparticles. The cosmetic patch of claim 2, wherein the plurality of nanorods are arranged in a predetermined direction. The cosmetic patch according to any one of claims 1 to 3, wherein the cellulose film has a thickness of 10 to 100 占 퐉. The cosmetic patch according to claim 2 or 3, wherein the zinc oxide nanoparticles have a size of 50 to 100 nm and the zinc oxide part has a thickness of 300 to 700 nm. The beauty patch according to any one of claims 1 to 3, wherein the counter electrode is one selected from the group consisting of platinum, gold, silver, nickel, chromium, and aluminum. The cosmetic patch according to any one of claims 1 to 3, wherein chitosan is applied to the surface of the cellulose film on which the zinc oxide is not formed. Preparing a cellulose film; Generating at least one zinc oxide seed on either surface of the cellulose film; Forming a zinc oxide part composed of zinc oxide nanorods grown with zinc oxide nanoparticles using the zinc oxide seed; And forming at least one counter electrode on the surface of the cellulose film on which the zinc oxide part is formed. [9] The method of claim 8, wherein the forming of the counter electrode is performed by applying various metal thin films or spraying a metal nanowire, carbon nanotube, and graphene.

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