Ultraviolet-absorbing composition and method for producing same

Abstract

Provided are: a composition for absorbing ultraviolet light, which has an excellent ultraviolet light absorption function, and particularly absorbs UVA (wavelength of 315-380 nm) and UVB (wavelength of 280-315 nm), while having excellent dispersibility; a method for producing the same; and a method for absorbing ultraviolet light using the same. A composition for absorbing ultraviolet rays, which contains carbon-based quantum dots, an aqueous solvent, a surfactant, and an oily base agent. Alternatively, a composition for absorbing ultraviolet rays contains carbon-based quantum dots, an aqueous solvent, and a hydrophilic base agent. A method for producing a composition for absorbing ultraviolet rays, the method including a step of mixing an aqueous dispersion containing carbon-based quantum dots and an aqueous solvent, a surfactant, and an oily base agent. A method for producing a composition for absorbing ultraviolet rays, the method including a step of mixing an aqueous dispersion containing carbon-based quantum dots and an aqueous solvent with a hydrophilic base agent.

Description

Technical Field

[0001] The present invention relates to an ultraviolet absorbing composition which can be used in products such as cosmetics, a method for producing the same, and an ultraviolet absorbing method using the same. Background Art

[0002] Electromagnetic waves (light) in the range of about 10 to 400 nm, such as ultraviolet rays, not only cause sunburn to our skin, but also cause "photoaging" (a phenomenon in which DNA damage and connective tissue destruction caused by ultraviolet rays do not allow normal skin regeneration to occur in time, thus accelerating aging). Sunlight includes ultraviolet rays called UVA (wavelength 315 to 380 nm), UVB (wavelength 280 to 315 nm), and UVC (wavelength 200 to 280 nm). UVC with a short wavelength hardly reaches the earth's surface, but UVA and UVB do. As a result, the skin appears to be older than the age of the person, including the risk of skin cancer.

[0003] Various sunscreen materials have been developed so far. Representative materials include inorganic ultraviolet reflectors such as titanium oxide and zinc oxide. Titanium oxide particularly reflects ultraviolet rays with a wavelength of 260 to 400 nm, which mainly includes UVB (wavelength 280 to 315 nm). Zinc oxide also reflects the same wavelength, but its reflection of UVA (wavelength 315 to 380 nm) is better than that of titanium oxide. Therefore, the two materials are mixed and used as inorganic ultraviolet reflectors. For example, in Patent Document 1, a highly transparent and excellently dispersible ultraviolet absorber is described, in which ultrafine zinc oxide particles with an average particle size of less than 100 nm are coated on the surface of a flaky matrix.

[0004] On the other hand, the sunscreens that have increased since 2006 are those that contain organic ultraviolet absorbers. Currently, about half of the market is gradually becoming organic ultraviolet absorbers. For example, in Patent Document 2, as an organic ultraviolet absorber, a sunscreen aerosol cosmetic containing ethylhexyl methoxycinnamate and the like can be cited.

[0005] Prior art literature Patent Literature Patent Document 1: Japanese Patent Application Laid-Open No. 11-302625 Patent Document 2: Japanese Patent Application Publication No. 2021-080203 Summary of the invention

[0006] Technical problem to be solved by the invention However, in an inorganic ultraviolet absorber containing ultrafine zinc oxide particles as disclosed in Patent Document 1, for example, the powder is likely to aggregate over a long period of time, and there is room for further improvement from the viewpoint of dispersibility and the like.

[0007] In addition, as a case where an inorganic ultraviolet reflector is not used, there is a sunscreen containing an organic ultraviolet absorber, such as Patent Document 2. However, there are many types of organic ultraviolet absorbers, but the width of the wavelength that can be absorbed by each is different, so a single component cannot cover a wide range. Therefore, at least three types need to be mixed, and the operation becomes complicated, so there is room for further improvement.

[0008] Therefore, an object of the present invention is to provide an ultraviolet absorbing composition having excellent ultraviolet absorbing function, particularly absorbing UVA (wavelength 315 to 380 nm) and UVB (wavelength 280 to 315 nm) and having excellent dispersibility, a method for producing the same, and an ultraviolet absorbing method using the same.

[0009] Technical solutions for solving technical problems The present inventors have conducted intensive studies to achieve the above object and have found that excellent ultraviolet absorption function can be exerted by well dispersing carbon-based quantum dots in an oily base or a hydrophilic base, thereby completing the present invention.

[0010] That is, the present invention includes the following aspects.

[0011] 1. A composition for ultraviolet absorption, comprising carbon quantum dots, an aqueous solvent, a surfactant and an oily base.

[0012] 2. A composition for ultraviolet absorption, comprising carbon-based quantum dots, an aqueous solvent and a hydrophilic base.

[0013] 3. The ultraviolet absorbing composition according to 1. or 2., wherein the content of the carbon-based quantum dots is 0.001 to 10 w / w % relative to the total amount of the composition.

[0014] 4. The ultraviolet absorbing composition according to 1. or 3., wherein the surfactant is one or more selected from the group consisting of nonionic surfactants, anionic surfactants, cationic surfactants and amphoteric surfactants.

[0015] 5. The ultraviolet absorbing composition according to any one of 1. or 3. to 4., wherein the oily base is one or more selected from hydrocarbons, fatty acids, higher alcohols, ester oils, fats and oils, waxes, siloxanes and silicones.

[0016] 6. The ultraviolet absorbing composition according to any one of 2. to 4., wherein the hydrophilic base is one or more selected from the group consisting of sugars, water-soluble polymers, polyols, cellulose derivatives, glycol ethers and lower alcohols.

[0017] 7. A composition for ultraviolet absorption, wherein the composition for ultraviolet absorption according to any one of 1. to 6. is formulated in the form of at least one selected from liquid, suspension, emulsion, cream, ointment, gel, liniment, spray, aerosol, poultice, tablet, powder and lotion.

[0018] 8. A cosmetic comprising the ultraviolet absorbing composition according to any one of 1. to 7.

[0019] 9. A method for producing an ultraviolet absorbing composition, comprising the step of mixing an aqueous dispersion containing carbon quantum dots and an aqueous solvent, a surfactant, and an oily base.

[0020] 10. A method for producing an ultraviolet absorbing composition, comprising the step of mixing an aqueous dispersion containing carbon-based quantum dots and an aqueous solvent, and a hydrophilic base.

[0021] 11. A method for absorbing ultraviolet rays, comprising using an ultraviolet absorbing composition comprising carbon quantum dots, an aqueous solvent, a surfactant and an oily base.

[0022] 12. A method for absorbing ultraviolet rays, comprising using an ultraviolet absorbing composition comprising carbon quantum dots, an aqueous solvent and a hydrophilic base.

[0023] Effects of the Invention According to the ultraviolet absorbing composition of the present invention, it is possible to provide an ultraviolet absorbing composition having excellent ultraviolet absorbing function and excellent dispersibility. In addition, according to the method for producing the ultraviolet absorbing composition of the present invention, it is possible to obtain an ultraviolet absorbing composition having excellent ultraviolet absorbing function and excellent dispersibility. In addition, according to the ultraviolet absorbing method of the present invention, it is possible to provide an ultraviolet absorbing method using the ultraviolet absorbing composition having excellent ultraviolet absorbing function and excellent dispersibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a photograph showing the dispersibility of the ultraviolet absorbing composition of Example 1 obtained using graphene quantum dots immediately after filling.

[0025] Figure 2 This is a photograph showing the dispersibility of the ultraviolet absorbing composition of Example 1 obtained using graphene quantum dots one month after filling.

[0026] Figure 3 This is a photograph showing the dispersibility of the ultraviolet absorbing composition of Comparative Example 1 having no surfactant immediately after filling.

[0027] Figure 4This is a diagram showing the absorption distribution of a water dispersion of graphene quantum dots (before being dispersed in vaseline) depending on the QD concentration.

[0028] Figure 5 This is a graph showing the absorption distribution of a water dispersion of graphene quantum dots (dispersed in vaseline) relative to vaseline (control) based on the QD concentration.

[0029] Figure 6 This is a graph showing the absorption distribution of a water dispersion of graphene quantum dots (dispersed in vaseline) after two months relative to vaseline (control) based on the QD concentration. DETAILED DESCRIPTION

[0030] <Ultraviolet absorbing composition> The ultraviolet absorption composition of the present invention contains carbon quantum dots, an aqueous solvent, a surfactant and an oily base. The ultraviolet absorption composition of the present invention contains carbon quantum dots, an aqueous solvent and a hydrophilic base. In addition, the ultraviolet absorption composition of the present invention can be used in products such as cosmetics. Hereinafter, the mode for implementing the present invention will be described in detail. However, the present invention is not limited to the following embodiments.

[0031] (Carbon Quantum Dots) The ultraviolet absorption composition of the present invention contains carbon quantum dots. Quantum dots refer to nanometer-scale particles having unique optical properties that conform to quantum chemistry and quantum mechanics, and the optical properties can be adjusted by the particle size, so they have characteristic luminescence properties that depend on the particle size. In the present invention, among the quantum dots, carbon quantum dots having luminescence properties that depend on the particle size due to the π bonds between carbon atoms can be used.

[0032] Carbon-based quantum dots include graphene quantum dots having a graphene structure, carbon quantum dots not having a graphene structure, quantum dots chemically modified from these, and the like. From the perspective of practical application, one or more selected from graphene quantum dots and carbon quantum dots are preferred.

[0033] These carbon-based quantum dots are commercially available from Sigma-Aldrich, Fuji Pigment Co., Ltd., GS Alliance Co., Ltd., Funakoshi Co., Ltd., Kishida Chemical Co., Ltd., etc., and all of them can be used. From the viewpoint of practicality, it is preferred to use carbon-based quantum dots in the form of an aqueous dispersion formed by dispersing carbon-based quantum dots in an aqueous solvent described later, and such carbon-based quantum dots in the form of a commercially available product can also be obtained.

[0034] The content of carbon-based quantum dots relative to the total amount of the composition is not particularly limited when used as a raw material, but from the perspective of obtaining a moderate absorbance and practicality, it is preferably 0.001w / w% or more and 10w / w% or less relative to the total amount of the composition, more preferably 0.01w / w% or more and 8w / w% or less, further preferably 0.05w / w% or more and 6w / w% or less, particularly preferably 0.1w / w% or more and 5w / w% or less, particularly preferably 0.1w / w% or more and 3.5w / w% or less. Here, in this specification, the unit "w / w%" of content has the same meaning as the w / w% of "g / 100g". It should be noted that the content of carbon-based quantum dots in the preparation is preferably the concentration described above, but the raw material can be the concentration in the preparation, or a higher concentration.

[0035] (Graphene Quantum Dots) Examples of graphene quantum dots include non-functionalized graphene quantum dots, functionalized graphene quantum dots, pristine graphene quantum dots, and combinations thereof.

[0036] The functionalized graphene quantum dots may be functionalized with one or more functional groups, including oxygen, carboxyl, carbonyl, amorphous carbon, hydroxyl, alkyl, aryl, ester, amine, amide, polymer, poly(propylene oxide), and combinations thereof.

[0037] In addition, the graphene quantum dots include functionalized graphene quantum dots functionalized with more than one alkyl group. The alkyl group includes methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, and combinations thereof. In some embodiments, the alkyl group includes octyl (e.g., octylamine).

[0038] In addition, the graphene quantum dots can be functionalized with one or more polymer precursors. For example, the graphene quantum dots can be functionalized with one or more monomers (eg, vinyl monomers).

[0039] Graphene quantum dots can be functionalized by polymerizing a polymer precursor to form polymer functionalized graphene quantum dots. For example, the end can be functionalized by polymerizing a vinyl monomer to form an adduct of end functionalized polyethylene.

[0040] The graphene quantum dots include functionalized graphene quantum dots functionalized with one or more hydrophilic functional groups. The hydrophilic functional groups include carboxyl, carbonyl, hydroxyl, hydroxyalkyl, poly(ethylene glycol), poly(vinyl alcohol), poly(acrylic acid), and combinations thereof.

[0041] The graphene quantum dots include functionalized graphene quantum dots functionalized with one or more hydrophobic functional groups. The hydrophobic functional groups include alkyl groups, aryl groups, and combinations thereof. The hydrophobic functional groups include one or more alkylamides or arylamides.

[0042] The graphene quantum dots include end-functionalized graphene quantum dots. The end-functionalized graphene quantum dots include one or more of the above-mentioned hydrophobic functional groups. The end-functionalized graphene quantum dots include one or more of the above-mentioned hydrophobic functional groups. The end-functionalized graphene quantum dots also include one or more of the above-mentioned hydrophilic functional groups. The end-functionalized graphene quantum dots include one or more of the oxygen adducts located at their ends. The end-functionalized graphene quantum dots include one or more of the amorphous carbon adducts located at their ends.

[0043] The end of the graphene quantum dot is functionalized with one or more alkyl or aryl groups such as alkylamide or arylamide. The end functionalization of the graphene quantum dot with the alkyl or aryl group is performed by reacting the alkylamide or arylamide at the end of the graphene quantum dot with a carboxylic acid.

[0044] Graphene quantum dots include pristine graphene quantum dots. Pristine graphene quantum dots include graphene quantum dots that have not been treated after synthesis. Pristine graphene quantum dots include graphene quantum dots that have not undergone any additional surface modification after synthesis.

[0045] Graphene quantum dots can be obtained from various sources. For example, graphene quantum dots include graphene quantum dots derived from coal, graphene quantum dots derived from coke, and combinations thereof. Graphene quantum dots include graphene quantum dots derived from coke. Graphene quantum dots include graphene quantum dots derived from coal. Coal includes (but is not limited to) anthracite, bituminous coal, sub-bituminous coal, modified bituminous coal, asphaltene, asphalt, peat, lignite, boiler coal, petrified oil, carbon black, activated carbon, and combinations thereof. The carbon source is bituminous coal. Carbon includes bituminous coal.

[0046] The graphene quantum dots may have various diameters. For example, the graphene quantum dots preferably have a diameter in the range of about 1 nm to about 100 nm, more preferably in the range of about 1 nm to about 50 nm, and further preferably in the range of about 1 nm to about 20 nm.

[0047] The graphene quantum dots may also have various structures. For example, the graphene quantum dots may have a crystalline structure, such as a crystalline hexagonal structure. The graphene quantum dots may have a single layer or multiple layers, such as about two layers to about four layers.

[0048] Graphene quantum dots may also have a variety of quantum yields. Graphene quantum dots preferably have a quantum yield in the range of about 30% to 80%. In addition, the fluorescence characteristics of the aqueous dispersion of graphene quantum dots preferably have an emission wavelength of 380nm to 650nm relative to at least any one wavelength of the excitation light 300nm to 420nm.

[0049] Graphene quantum dots can be in powder form or in particle form. Graphene quantum dots can be in liquid state or in a dispersion, solution or molten state. From the viewpoint of dispersibility, preferably graphene quantum dots are dispersed in the form of an aqueous dispersion formed by the aqueous solvent described later, and graphene quantum dots of such a form can also be obtained in the form of a commercially available product.

[0050] Various methods can be used to form graphene quantum dots. For example, the process of forming graphene quantum dots can include exposing a carbon source to an oxidant, as a result of which graphene quantum dots are formed. The carbon source includes coal, coke, and combinations thereof.

[0051] The oxidant includes an acid, and the acid includes sulfuric acid, nitric acid, phosphoric acid, hypophosphorous acid, oleum, hydrochloric acid, oleum, chlorosulfonic acid, and combinations thereof. In addition, the oxidant includes potassium permanganate, sodium permanganate, hypophosphorous acid, nitric acid, sulfuric acid, hydrogen peroxide, and combinations thereof. The preferred oxidant is a mixture of potassium permanganate, sulfuric acid, and hypophosphorous acid.

[0052] The carbon source is exposed to the oxidant by sonicating the carbon source in the presence of the oxidant. The carbon source is heated in the presence of the oxidant. The heating is performed at a temperature of at least about 100°C.

[0053] Other methods of forming graphene quantum dots can also be envisioned. For example, another method of forming graphene quantum dots is disclosed in International Patent Application No. PCT / US2014 / 036604. Another suitable method of making graphene quantum dots is also disclosed in the following references: ACS Appl. Mater. Interfaces 2015, 7, 7041-7048; and Nature Commun. 2013, 4: 2943, 1-6.

[0054] (Carbon Quantum Dots) Carbon quantum dots are quantum dots that do not have a ring structure like graphene. Carbon quantum dots are more susceptible to pH than graphene quantum dots, and have the property of changing the luminescence intensity and peak position.

[0055] The carbon quantum dots may have various diameters. For example, the carbon quantum dots preferably have a diameter ranging from about 1 nm to about 100 nm, more preferably from about 1 nm to about 50 nm, and further preferably from about 1 nm to about 30 nm.

[0056] Carbon quantum dots may also have various quantum yields. Carbon quantum dots preferably have a quantum yield in the range of about 20 to 50%. In addition, the fluorescence characteristics of the aqueous dispersion of carbon quantum dots preferably have an emission wavelength of 380 nm to 600 nm relative to at least any wavelength of the excitation light 300 nm to 420 nm.

[0057] The manufacturing method of carbon quantum dots is not much different from that of graphene quantum dots. The only difference lies in whether the raw materials and manufacturing conditions used are easy to form a graphene structure.

[0058] Therefore, carbon-based quantum dots containing both can also be produced by the following methods, for example: a method of producing by chemically treating a carbon target after laser ablation (Japanese Patent Publication No. 2012-501863), a method of producing from candle coal (H. Liu, et al., Angew. Chem. Int. Ed. 2007, 46, 6473-6475.), a method of producing by chemically treating graphite oxide (G. Eda, et al., Adv. Mater. 2010, 22, 505-509.), a method of producing by a chemical reaction using graphite oxide as a precursor (Japanese Patent Publication No. 2012-136566), a method of producing by a conversion reaction of fullerene (J. Lu, et al., Nature Nanotech. 2011, 6, 247-252.), and a method of producing by chemically treating a cheaper carbon raw material such as carbon fiber or activated carbon (J. Peng, et al., NanoLett.2012,12,844-849., ZAQiao, ChemCommun.2010,46,8812-8814., Y.Dong, et al., Chem.Mater.2010,22,5895-5899.).

[0059] It should be noted that these methods are generally top-down methods, but carbon quantum dots can also be produced by a bottom-up method of polymerizing organic precursor molecules (GAOzin, et al., J. Mater. Chem., 2012, 22, 1265-1269).

[0060] In addition, it can also be manufactured by a method for manufacturing carbon quantum dots (Japanese Patent Publication No. 2014-133685), which includes: mixing a carbon material with hydrogen peroxide, using hydrogen peroxide to decompose the carbon to prepare a carbon quantum dot generating liquid; and separating the carbon quantum dots and hydrogen peroxide in the carbon quantum dot generating liquid to stop the decomposition reaction and obtain the carbon quantum dots.

[0061] The carbon quantum dots may be in the form of a powder or a particle. The carbon quantum dots may be in a liquid state or in a dispersion, solution, or molten state. From the viewpoint of dispersibility, the carbon quantum dots are preferably in the form of an aqueous dispersion in an aqueous solvent described later, and such carbon quantum dots may also be obtained in the form of a commercially available product.

[0062] (Water-based solvent) The ultraviolet absorption composition of the present invention comprises an aqueous solvent. If the impact on the environment and the human body is considered, the aqueous solvent in the present invention is preferably water or a solvent mainly comprising water. Relative to the total amount of the aqueous solvent, the content of water relative to the total amount of the aqueous solvent is preferably 80w / w% or more and 100w / w% or less, more preferably 85w / w% or more and 99.9w / w% or less, and further preferably 90w / w% or more and 99.5w / w% or less. The water used in the present invention is not particularly limited, and for example, tap water, purified water, distilled water, ion exchange water, pure water, ultrapure water, etc. can be cited.

[0063] In addition, the aqueous solvent in the present invention may contain any known components without particular limitation, for example, any substances such as dispersants, acids, salts, organic solvents, etc. As examples of organic solvents, preferably organic solvents miscible with water can be cited, such as methanol, ethanol, isopropanol, acetone, acetonitrile, propionitrile, tetrahydrofuran, 1,4-dioxane, methyl isobutyl ketone, methyl ethyl ketone, γ-butyrolactone, propylene carbonate, cyclopentane, nitromethane, N,N-dimethylformamide, N-methylacetamide, dimethyl sulfoxide, dimethyl sulfone, N-methylpyrrolidone, benzene, toluene, xylene, dichloromethane, chloroform, dichloroethane, etc.

[0064] The content of the aqueous solvent relative to the total amount of the composition is not particularly limited. Regardless of whether an oily base is used in the composition or a hydrophilic base is used in the composition, the content relative to the total amount of the composition is preferably 0.01 w / w% to 50 w / w%, more preferably 0.05 w / w% to 40 w / w%, and further preferably 0.1 w / w% to 30 w / w%.

[0065] (Aqueous dispersion) In the present invention, from the viewpoint of stability, it is preferred that the form of the aqueous dispersion containing the above-mentioned carbon-based quantum dots and the above-mentioned aqueous solvent is used. As described above, commercially available aqueous dispersions can also be used directly as aqueous dispersions. In addition, in order to improve dispersibility, the aqueous dispersion can also be further diluted with the above-mentioned aqueous solvent and used after adjusting the concentration of the carbon-based quantum dots. From the viewpoint of manufacturing efficiency and operability, the content of the carbon-based quantum dots relative to the total amount of the aqueous dispersion is preferably 1w / w% or more and 30w / w% or less, more preferably 5w / w% or more and 20w / w% or less, relative to the total amount of the aqueous dispersion. The aqueous dispersion may contain any previously known components without particular limitation, for example, any substance such as a dispersant, an acid, a salt, an organic solvent, etc. The aqueous dispersion in the present invention can be manufactured by conventional methods in the technical field, for example, mixing and stirring carbon-based quantum dots, aqueous solvents and other arbitrary components as needed.

[0066] (Surfactant) When an oily base is used in the composition, the ultraviolet absorbing composition of the present invention contains a surfactant. On the other hand, when a hydrophilic base is used in the composition, a surfactant may also be contained. The surfactant in the present invention is not particularly limited, and a known surfactant can be used. From the viewpoint of improving dispersibility, it is preferably selected from one or more of a nonionic surfactant, an anionic surfactant, a cationic surfactant and an amphoteric surfactant.

[0067] The nonionic surfactant is not particularly limited, and known nonionic surfactants can be used, for example, polyoxyalkylene alkyl ethers, polyoxyalkylene alkenyl ethers, alkyl glyceryl ethers, alkenyl glyceryl ethers, sucrose fatty acid esters, glycerol fatty acid esters, polyglycerol fatty acid esters, polyethylene glycol fatty acid esters, propylene glycol fatty acids, ester higher fatty acids, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene fatty acid esters, monoethanolamide or diethanolamide, polyoxyethylene hydrogenated castor oil, alkyl saccharides, alkyl amine oxides, alkyl amide amine oxides, polyoxyalkylene-modified silicones, polyoxyalkylene-modified organopolysiloxanes, polyoxyalkylene-alkyl co-modified organopolysiloxanes, and the like. From the viewpoint of improving dispersibility, ether-type nonionic surfactants such as polyoxyalkylene alkyl ethers, polyoxyalkylene alkenyl ethers, alkyl glyceryl ethers, alkenyl glyceryl ethers, sucrose fatty acid esters, glycerol fatty acid esters, polyglycerol fatty acid esters, polyethylene glycol fatty acid esters, propylene glycol fatty acids, ester higher fatty acids, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitol fatty acid esters, polyoxyethylene fatty acid esters, and ester-type nonionic surfactants such as polyoxyethylene fatty acid esters are preferably used. These may be used alone or in combination of two or more.

[0068] For example, examples of sorbitan fatty acid esters include sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan sesquioleate, sorbitan coconut oil fatty acid ester, sorbitan tristearate, etc. Examples of sorbitan monopalmitate include RHEODOL SP-P10, examples of sorbitan monostearate include RHEODOL SP-S10V, examples of sorbitan monooleate include RHEODOL SP-010V and RHEODOL AO-10V, examples of sorbitan sesquioleate include RHEODOL AO-15V, examples of sorbitan coconut oil fatty acid ester include RHEODOL SP-L10, and examples of sorbitan tristearate include commercial products such as SP-S30V (all manufactured by Kao Corporation).

[0069] As anionic surfactant, there is no particular limitation, and known anionic surfactants can be used, for example, sulfuric acid-based, sulfonic acid-based, carboxylic acid-based, phosphoric acid-based anionic surfactants, etc. can be cited. As sulfuric acid-based, alkyl sulfates, polyoxyalkylene alkyl ether sulfates, polyoxyalkylene alkenyl ether sulfates, sulfosuccinic acid alkylene alkylphenyl ether sulfates, etc. can be cited. As sulfonic acid-based, alkane sulfonates, etc. can be cited. As carboxylic acid-based, alkyl ether carboxylic acids or salts thereof, polyoxyethylene alkyl ether carboxylic acids or salts thereof, etc. can be cited. As phosphoric acid-based, monoalkyl phosphates, etc. can be cited. These can be used alone or in combination of two or more.

[0070] For example, as the polyoxyethylene alkyl ether carboxylic acid or its salt, specifically, it is preferred to include one or more selected from polyoxyethylene lauryl ether carboxylic acid or its salt, polyoxyethylene myristyl ether carboxylic acid or its salt, and polyoxyethylene palmityl ether carboxylic acid or its salt. As their commercially available products, for example, KAO AKYPO RLM-45NV, KAO AKYPO RLM-45, KAO AKYPO RLM-100NV, KAO AKYPO RLM-100 (all manufactured by Kao Corporation) and the like can be cited.

[0071] The cationic surfactant is not particularly limited, and known cationic surfactants can be used, and examples thereof include quaternary ammonium salts and alkylamine salts, etc. These can be used alone or in combination of two or more.

[0072] For example, as quaternary ammonium salts, there can be mentioned lauryltrimethylammonium chloride, hexadecyltrimethylammonium chloride, stearyltrimethylammonium chloride, distearyldimethylammonium chloride, alkyl (carbon number 11 or more and 23 or less) benzyldimethylammonium chloride, alkyltrimethylammonium salts, dialkyldimethylammonium salts, alkylbenzyldimethylammonium salts, etc. As commercially available products thereof, there can be mentioned, for example, QUARTAMIN 24P, QUARTAMIN 60W, QUARTAMIN 86P Conc, QUARTAMIN 86W, QUARTAMIND86P, Sanisol C, Sanisol B-50 (all manufactured by Kao Corporation), etc.

[0073] For example, as the alkylamine salt, there can be mentioned an alkylamine salt having an alkyl group having 11 or more and 23 carbon atoms (for example, the salt is acetate). As the alkylamine salt, specifically, there can be mentioned coconut amine acetate and stearyl amine acetate. As commercial products thereof, there can be mentioned, for example, Acetamin 24 and Acetamin 86 (these are manufactured by Kao Corporation).

[0074] As the amphoteric surfactant, there is no particular limitation, and known amphoteric surfactants can be used, for example, acetic acid betaine type surfactants such as lauryl dimethylaminoacetic acid betaine, amine oxide type surfactants such as lauryl dimethylamine oxide, imidazolinium betaine type surfactants such as 2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazolinium betaine, amidobetaine type surfactants such as lauric acid amidopropyl betaine, sulfobetaine type surfactants such as lauryl hydroxysulfobetaine, etc. can be mentioned. These can be used alone or in combination of two or more.

[0075] The surfactant in the present invention can be used alone as described above or in combination of two or more. When an oily base is used in the composition, from the viewpoint of improving dispersibility, the content of the surfactant relative to the total amount of the composition (the total content when two or more are used in combination) is preferably 0.01 w / w% or more and 5.0 w / w% or less, more preferably 0.1 w / w% or more and 4.5 w / w% or less, and further preferably 0.5 w / w% or more and 4.0 w / w% or less. It should be noted that even when a hydrophilic base is used in the composition, a surfactant can be added. In this case, the content of the surfactant is not particularly limited, but can also be prepared in the amount described above.

[0076] In the ultraviolet-absorbing composition of the present invention, with respect to 1 part by mass of the total content of carbon-based quantum dots, the ratio of the compounding amount of the surfactant to the carbon-based quantum dots is preferably 0.01 part by mass or more and 20.0 parts by mass or less, more preferably 0.1 part by mass or more and 10.0 parts by mass or less.

[0077] (oil-based base) The ultraviolet-absorbing composition of the present invention preferably contains an oil-based base. In the present specification, "oil-based" means that the solubility in water is 1 w / w% or less. The oil-based base in the present invention is not particularly limited, and known oil-based bases can be used. For example, hydrocarbons, fatty acids, higher alcohols, ester oils, fats and oils, waxes, siloxanes, and silicones can be mentioned. In the present invention, the oil-based base is preferably at least one selected from hydrocarbons, fatty acids, higher alcohols, ester oils, fats and oils, waxes, siloxanes, and silicones.

[0078] As the hydrocarbons, for example, alkanes, isoparaffins, liquid alkanes, liquid isoparaffins, squalane, petrolatum, α-olefin oligomers, light liquid alkanes, light liquid isoparaffins, etc. can be mentioned. They can be used alone or in combination of two or more. It should be noted that petrolatum is usually obtained by decolorizing and refining a mixture of hydrocarbons obtained from petroleum, and mostly contains branched-chain alkanes (such as isoparaffins) and alicyclic hydrocarbons (such as cycloparaffins, naphthenes, etc.).

[0079] As the fatty acids, for example, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, isostearic acid, oleic acid, etc. can be mentioned. They can be used alone or in combination of two or more.

[0080] In the present specification, the higher alcohol means an alcohol having 10 or more and 30 or less carbon atoms. As the higher alcohol, for example, cetyl alcohol, stearyl alcohol, cetearyl alcohol, lauryl alcohol, oleyl alcohol, isostearyl alcohol, behenyl alcohol, cholesterol, phytosterol, etc. can be mentioned. They can be used alone or in combination of two or more.

[0081] Examples of the ester oil include isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, isopropyl isostearate, octyl palmitate, diisopropyl adipate, diisopropyl sebacate, isononyl isononanoate, isotridecyl isononanoate, cetyl lactate, isostearyl isostearate, 12-hydroxystearate cholesterol, cholesterol oleate, macadamia fatty acid phytosteryl ester, oleic acid phytosteryl ester, dextrin palmitate, inulin stearate, hydrogenated jojoba oil, dipentaerythritol fatty acid ester, neopentyl glycol dicaprate, di- Diethoxydiglycol cyclohexane 1,4-dicarboxylate, tri-2-ethylhexyl trimellitate, pentane erythritol tetra-2-ethylhexanoate, tri-2-ethylhexanoin glyceryl, tri(caprylic acid / capric acid)glyceryl, tri(caprylic acid / capric acid / myristic acid / stearic acid)glyceryl, di(phytosteryl / octyldodecanol) lauroyl glutamate, di(octyldodecanol / phytosteryl / behenyl) lauroyl glutamate, 2-ethylhexyl succinate, triethyl citrate, dimer-dilinoleic acid (phytosteryl / isostearyl alcohol / cetyl alcohol / stearyl alcohol / behenyl alcohol) ester, etc. These may be used alone or in combination of two or more.

[0082] Examples of the fats and oils include vegetable fats and oils such as avocado oil, macadamia oil, corn oil, olive oil, jojoba oil, grape seed oil, sunflower oil, almond oil, sesame oil, cocoa butter, soybean oil, peanut oil, evening primrose oil, rapeseed oil, cottonseed oil, palm oil, palm kernel oil, coconut oil, sunflower oil, and safflower oil, and animal fats and oils such as butter, lard, fish oil, milk fat, horse fat, egg yolk oil, mink oil, and turtle oil. These may be used alone or in combination of two or more.

[0083] Examples of the wax include candelilla wax, carnauba wax, beeswax, spermaceti wax, and deep sea fish oil (Orange Roughy Oil). These can be used alone or in combination of two or more.

[0084] Examples of the siloxane include methyl polysiloxane, methylphenyl polysiloxane, decamethylcyclopentasiloxane, methylcyclopentasiloxane, high polymer methyl polysiloxane, octamethylcyclotetrasiloxane, methyl hydrogen polysiloxane, and crosslinked methyl polysiloxane, etc. These may be used alone or in combination of two or more.

[0085] Examples of silicone include alkyl-modified silicones such as methyl trimethicone, dimethiconol, dimethiconol crosspolymer, and octyl methicone, crosslinked alkyl-modified silicones, acrylic silicones, silicone resins, and cyclic silicones, etc. These may be used alone or in combination of two or more.

[0086] The oily base in the present invention can be used alone or in combination of two or more of the above-mentioned oily bases. From the viewpoint of improving dispersibility, the content of the oily base relative to the total amount of the composition (the total content when two or more are used in combination) is preferably 50 w / w% or more and 99 w / w% or less, more preferably 60 w / w% or more and 97 w / w% or less, and further preferably 70 w / w% or more and 95 w / w% or less.

[0087] In the ultraviolet absorbing composition of the present invention, the ratio of the amount of the oily base to the carbon-based quantum dots per 1 part by mass of the total content of the carbon-based quantum dots is preferably 5 parts by mass or more and 700 parts by mass or less, more preferably 7 parts by mass or more and 650 parts by mass or less, and further preferably 10 parts by mass or more and 600 parts by mass or less.

[0088] (Hydrophilic base) The ultraviolet absorbing composition of the present invention preferably contains a hydrophilic base. In this specification, "hydrophilicity" refers to a solubility in water greater than 50w / w%. The hydrophilic base in the present invention is not particularly limited, and known hydrophilic bases can be used, for example, sugars, water-soluble polymers, polyols, cellulose derivatives, glycol ethers, lower alcohols, etc. can be cited. In the present invention, the hydrophilic base is preferably selected from one or more of sugars, water-soluble polymers, polyols, cellulose derivatives, glycol ethers and lower alcohols.

[0089] Examples of the sugars include glucose, sucrose, fructose, sorbitol, maltitol, pentaerythritol, xylitol, trehalose, glucosyltrehalose, carrageenan, etc. These can be used alone or in combination of two or more.

[0090] Examples of the water-soluble polymer include polyvinyl pyrrolidone, ethylene glycol triisostearate, polyoxyethylene (20) methyl glucoside triisostearate, bentonite, polyethylene glycol, sodium caseinate, etc. These may be used alone or in combination of two or more.

[0091] Examples of the polyol include glycerol, polyglycerol (e.g., diglycerol, tetraglycerol), etc. In addition, examples of the polyol include glycols such as ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, isoprene glycol, and butylene glycol. These can be used alone or in combination of two or more. These can be used alone or in combination of two or more.

[0092] Examples of the cellulose derivatives include ethyl cellulose, hydroxypropyl cellulose, and hydroxypropyl methyl cellulose, etc. These may be used alone or in combination of two or more.

[0093] Examples of the glycol ethers include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether (ethoxydiglycol), diethylene glycol monopropyl ether, diethylene glycol monobutyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, dipropylene glycol monoethyl ether, and dipropylene glycol monopropyl ether. These may be used alone or in combination of two or more.

[0094] In the present specification, a lower alcohol refers to a monohydric alcohol having 1 to 6 carbon atoms. Examples of the lower alcohol include ethanol, propanol, isopropanol, n-butanol, sec-butanol, tert-butanol, isobutanol, pentanol, and hexanol. These can be used alone or in combination of two or more.

[0095] The hydrophilic base in the present invention can be used alone or in combination of two or more of the above-mentioned hydrophilic bases. From the viewpoint of improving dispersibility, the content of the hydrophilic base relative to the total amount of the composition (the total content when two or more are used in combination) is preferably 70 w / w% or more and 99 w / w% or less, more preferably 80 w / w% or more and 97 w / w% or less, and further preferably 85 w / w% or more and 95 w / w% or less.

[0096] In the ultraviolet absorbing composition of the present invention, the ratio of the amount of the hydrophilic base to the carbon-based quantum dots is preferably 400 parts by mass or more and 700 parts by mass or less, and more preferably 500 parts by mass or more and 600 parts by mass or less, relative to 1 part by mass of the total content of the carbon-based quantum dots.

[0097] (Optional additives) In the ultraviolet absorption composition of the present invention, in addition to the above-mentioned ingredients, additives commonly used in cosmetics, quasi-drugs, etc. can be combined within the scope of not hindering the effect of the present invention. As additives, such as pH adjusting agents, humectants, thickeners, stabilizers, chelating agents, preservatives, spices, antioxidants, whitening agents, anti-inflammatory agents, colorants, use feeling improvers, etc. can be appropriately combined as needed. These additives can be used alone or in combination with more than 2 kinds. It should be noted that the content of the above-mentioned additives is not particularly limited as long as the content of the desired ultraviolet absorption function can be obtained, and relative to the total amount of the composition, preferably 0.01w / w% or more and 20w / w% or less, more preferably 0.05w / w% or more and 15w / w% or less.

[0098] (form) The form of the ultraviolet absorbing composition of the present invention when being made into a preparation is not particularly limited, and can be arbitrarily selected according to the purpose of the composition, for example, liquid, suspension, emulsion, cream, ointment, gel, liniment, spray, aerosol, cataplasm, sheet, powder, lotion, etc. can be cited. In the present invention, the form of the composition is preferably selected from one or more of liquid, suspension, emulsion, cream, ointment, gel, liniment, spray, aerosol, cataplasm, sheet, powder and lotion. Such preparations can be prepared by methods commonly used in the technical field.

[0099] When the ultraviolet absorbing composition of the present invention is formulated, the content of the carbon quantum dots is preferably adjusted so as to obtain the desired ultraviolet absorbing effect. The content of the carbon quantum dots is preferably adjusted so that the absorbance of vaseline (control) at a wavelength of 350 nm is 3.0 or more when it is set to 1.

[0100] The pH of the ultraviolet absorbing composition of the present invention is not particularly limited as long as it is within a physiologically or pharmaceutically acceptable range, and is, for example, preferably 3.5 to 8.5, and more preferably 4.0 to 7.0.

[0101] As the container filled with the ultraviolet absorbing composition of the present invention, a container of known shape can be used without restriction. The raw material of the container is also not particularly limited, for example, it can be provided by filling it in a container made of raw materials such as plastics such as polyethylene terephthalate, polyethylene naphthalate, polyarylate, polycarbonate, polyethylene, and polypropylene, or glass.

[0102] (use) The ultraviolet absorbing composition of the present invention can be used for various purposes requiring these characteristics because of its excellent ultraviolet absorbing function and dispersibility. For example, it can be used for cosmetics, coatings, lubricating oils, pesticides, etc. In the present invention, from the viewpoint of increasing the ultraviolet absorbing function and improving the dispersibility, it is preferred to prepare a cosmetic containing the ultraviolet absorbing composition of the present invention described above. In these purposes, the ultraviolet absorbing composition of the present invention can be prepared, or each component can be prepared separately without preparing the ultraviolet absorbing composition.

[0103] As the cosmetic of the present invention, it can be widely used in sunscreen cosmetics, color cosmetics, skin cleansers, skin care products, hair cosmetics, etc., and from the aspect of having excellent ultraviolet absorption function, sunscreen cosmetics and color cosmetics are preferred. It should be noted that sunscreen cosmetics sometimes also have the function of color cosmetics like base cosmetics. More specifically, base cosmetics, powder foundation, liquid foundation, foundation cream, foundation stick, concealer, loose powder, pressed powder, blush, lipstick, lip gloss, lip liner, lip cream, lip balm, lip gloss, eyebrow pencil, eyebrow pencil, eyebrow powder, eyeliner, eyeliner liquid, mascara, mascara base, eyelash beauty essence, eye shadow, nail polish, nail care cosmetics, nail polish remover, solid soap, cleansing foam, cleansing powder, cleansing gel, cleansing cream, cleansing oil, point makeup remover (point makeup) can be exemplified. The cosmetics of the present invention can be used to protect the skin and hair from ultraviolet rays. The amount and method of application to the skin are not particularly limited. The cosmetics can be applied to the skin in an appropriate amount several times a day. As applications in other industrial fields of the present invention, the cosmetics can be widely applied to oily paints, oily inks, greases, industrial lubricants, OD agents for pesticides, etc. They can be manufactured according to conventional methods.

[0104] (Method for producing ultraviolet absorbing composition) Hereinafter, the method for producing the ultraviolet absorbing composition of the present invention and the cosmetic of the present invention will be described. The method for producing the ultraviolet absorbing composition of the present invention includes a step of mixing an aqueous dispersion containing carbon-based quantum dots and an aqueous solvent, a surfactant, and an oily base. In addition, the method for producing the ultraviolet absorbing composition of the present invention includes a step of mixing an aqueous dispersion containing carbon-based quantum dots and an aqueous solvent, and a hydrophilic base. It should be noted that for the same contents as those described above, the description here is sometimes omitted.

[0105] (Dilution process) In the present invention, as described above, the aqueous dispersion containing carbon-based quantum dots and an aqueous solvent is commercially available and can be used directly. However, from the viewpoint of improving dispersibility, it is preferred to include a dilution step of further diluting the aqueous dispersion using an aqueous solvent such as a method in which the content of the carbon-based quantum dots relative to the total amount of the aqueous dispersion is preferably 0.15 / w% or more and 10w / w% or less, more preferably 0.5w / w% or more and 5w / w% or less.

[0106] (Mixing process) In the present invention, when an oily base is used in the composition, the process includes: mixing an aqueous dispersion containing carbon-based quantum dots and an aqueous solvent, a surfactant, and an oily base. On the other hand, when a hydrophilic base is used in the composition, the process includes: mixing an aqueous dispersion containing carbon-based quantum dots and an aqueous solvent, and a hydrophilic base. Such a mixing process can be carried out by a method conventionally used in the technical field. For example, in an aqueous dispersion containing carbon-based quantum dots, the above-mentioned surfactant is added as needed, stirred thoroughly, and then the above-mentioned oily base (or hydrophilic base) is added, thereby enabling the components to be uniformly mixed. As a mixing condition, it is preferred to heat to preferably 40 to 100°C, more preferably 50 to 80°C, while mixing with a stirrer for about 10 minutes to 3 hours. The concentration of carbon-based quantum dots in the final composition can be adjusted by the amount of oily base (or hydrophilic base) added, and the content of carbon-based quantum dots relative to the total amount of the composition is preferably 0.001 w / w% or more and 10 w / w% or less, more preferably 0.01 w / w% or more and 8 w / w% or less, further preferably 0.05 w / w% or more and 6 w / w% or less, particularly preferably 0.1 w / w% or more and 5 w / w% or less, particularly preferably 0.1 w / w% or more and 3.5 w / w% or less. When mixing, any previously known component may be included without particular limitation, for example, any substance such as a dispersant, an acid, a salt, an organic solvent, etc. may be included.

[0107] (Method for producing cosmetics) The cosmetic of the present invention can be produced by a method commonly used in the art, for example, by mixing and stirring the above-mentioned ultraviolet absorbing composition and other components.

[0108] (UV absorption method) As described above, the ultraviolet absorption method of the present invention uses an ultraviolet absorption composition containing carbon quantum dots, an aqueous solvent, a surfactant and an oily base. In addition, as described above, the ultraviolet absorption method of the present invention uses an ultraviolet absorption composition containing carbon quantum dots, an aqueous solvent and a hydrophilic base. The details are as described above, so the description here is omitted.

[0109] Example Hereinafter, the present invention will be described in detail using examples, but the present invention is not limited to the following examples unless the gist thereof is exceeded. It should be noted that the evaluation items in the examples and the like were measured as follows.

[0110] (1) Determination of dispersibility Each ultraviolet absorbing composition obtained in Examples 1 to 8 and Comparative Examples 1 to 2 was weighed into a glass bottle of 10 mL to 20 mL, and the bottle was covered with a lid to prepare a sample. For each sample, the dispersibility just after filling at room temperature was visually confirmed. Furthermore, each sample was left to stand at room temperature for 1 month, and the dispersibility was visually confirmed. The evaluation results of each sample are shown in Tables 1 to 2 and Figures 1 to 3 In addition, a photograph of Example 1 immediately after filling is shown in Figure 1 , and a photograph of the dispersion after 1 month of filling is shown in Figure 2 The dispersibility photograph of Comparative Example 1 immediately after filling is shown in Figure 3 .

[0111] ○: The dispersibility is good and the whole is in a uniform state and remains in this state.

[0112] △: Good dispersibility, uniform overall, but slightly separated.

[0113] ×: Poor dispersibility, the whole cannot be uniform (2) Determination of absorption spectrum The absorption spectra of each ultraviolet absorbing composition obtained in Examples 1 to 8 and Comparative Examples 1 to 2 were measured using a spectrophotometer (V-770, manufactured by JASCO Corporation). The measurement range was set to 250 nm to 700 nm and 250 nm to 500 nm, and the measurement was performed under the measurement conditions of double beam. The measurement results are shown in Figures 4 to 6 Based on the measurement results, the ultraviolet absorption function was evaluated. The ultraviolet absorption function was evaluated based on the following criteria. The evaluation results are shown in Tables 1 and 2.

[0114] ○: 3.0 or more when the absorbance of vaseline (control) at a wavelength of 350 nm is set to 1.

[0115] △: 2.0 or more and less than 3.0 when the absorbance of vaseline (control) at a wavelength of 350 nm is set to 1.

[0116] ×: Less than 2.0 when the absorbance of vaseline (control) at a wavelength of 350 nm was set to 1.

[0117] Figure 4The aqueous dispersion of QD used in Example 1 (QD concentration: 1.5 w / w%) (before being dispersed in vaseline) was further diluted with purified water so that the final QD concentration became 0.0025 w / w% to 0.10 w / w% as shown in the figure, and each sample was prepared and measured using a 1 cm quartz dish under the above-mentioned measuring device and conditions.

[0118] Figure 5 The QD aqueous dispersion (QD concentration: 1.5 w / w%) used in Example 1 was adjusted with the amount of vaseline so that the final QD concentration became 0.15 w / w% to 3 w / w% as shown in the figure (in the case of 3 w / w%, it was not diluted to QD concentration: 1.5 w / w%, and QD concentration of 15 w / w% was used), and each sample was prepared, and each sample was applied to a polyethylene film so that the thickness was 25 μm, and the measurement was performed using the above-mentioned measuring device and conditions. It should be noted that as a control, the measurement was also performed similarly on only vaseline.

[0119] Figure 6 and Figure 5 The absorption spectrum of the sample after 2 months was the same as that after 2 months. The sample after 2 months is the measurement result of the sample that was stored without being sealed and without being attached to dust or other foreign matter at the time of manufacture. An absorption of 0.5 to 1.0 was confirmed in the range of 300nm to 450nm, and no degradation of the ultraviolet absorption effect was found. Especially above 400nm, the absorption increased compared to when it was manufactured. It is believed that this is because there is no sealing, so water is lost and the QD concentration becomes higher. Although the measured value is not recorded, it is confirmed that the weight of the sample after 2 months is reduced compared to the sample at the time of manufacture.

[0120] <Example 1> A water dispersion of graphene quantum dots (FUJI QD GRAPHENE 818 manufactured by Fuji Pigments Co., Ltd., quantum dot content (hereinafter also referred to as QD concentration) 15w / w%) was diluted 10 times with purified water to prepare a water dispersion in a manner that the QD concentration is 1.5w / w% relative to the total amount of the water dispersion. 1g of a surfactant (RHEODOL AO-10V (nonionic surfactant) manufactured by Kao Corporation) was added to 10g of the above-mentioned water dispersion (QD concentration: 1.5w / w%) and stirred thoroughly. Then, 89g of vaseline (Loshi Baby Vaseline Pure N manufactured by Cosmetex Roland Co., Ltd.) was added in a manner that the QD concentration was 0.15w / w% relative to the total amount of the composition, and the mixture was heated to 60°C and mixed thoroughly with a stirrer to prepare a UV absorbing composition (QD concentration: 0.15w / w% relative to the total amount of the composition).

[0121] <Example 1-1 and Example 1-2> In Example 1, except that each component was prepared so as to have the concentration described in Table 1, an ultraviolet absorbing composition was produced under the same conditions as in Example 1.

[0122] <Example 2> In Example 1, a UV absorbing composition was produced under the same conditions as in Example 1, except that a water dispersion of carbon quantum dots (FUJI QD CARBON 308 manufactured by Fuji Pigments Co., Ltd., QD concentration: 15 w / w%) was used instead of a water dispersion of graphene quantum dots (FUJI QD GRAPHENE 818 manufactured by Fuji Pigments Co., Ltd., QD concentration: 15 w / w%).

[0123] <Example 3> In Example 1, a UV absorbing composition was produced under the same conditions as in Example 1 except that a surfactant (KAO AKYPO RLM-100NV (anionic surfactant) manufactured by Kao Corporation) was used instead of a surfactant (RHEODOL AO-10V (nonionic surfactant) manufactured by Kao Corporation).

[0124] <Example 4> In Example 1, a UV absorbing composition was produced under the same conditions as in Example 1 except that a surfactant (Acetamin 86 (cationic surfactant) manufactured by Kao Corporation) was used instead of a surfactant (RHEODOL AO-10V (nonionic surfactant) manufactured by Kao Corporation).

[0125] <Example 5> In Example 1, a UV absorbing composition was produced under the same conditions as in Example 1, except that a surfactant (RHEODOL AO-10V (nonionic surfactant) manufactured by Kao Corporation) was not used and glycerin (manufactured by Fujifilm Wako Co., Ltd., commercially available under the name of glycerin) was used instead of vaseline (Loshi Baby Vaseline Pure N manufactured by Cosmetex Roland Co., Ltd.).

[0126] <Example 5-1 and Example 5-2> In Example 5, except that each component was prepared so as to have the concentration described in Table 2, an ultraviolet absorbing composition was produced under the same conditions as in Example 5.

[0127] <Example 6> In Example 5, an ultraviolet absorbing composition was produced under the same conditions as in Example 5, except that ethoxydiglycol (manufactured by Fujifilm Wako Co., Ltd., commercially available under the name of 2-(2-ethoxyethoxy)ethanol) was used instead of glycerol (manufactured by Fujifilm Wako Co., Ltd., commercially available under the name of glycerol).

[0128] <Example 7> In Example 5, an ultraviolet absorbing composition was produced under the same conditions as in Example 5, except that ethanol (manufactured by FUJIFILM Wako Co., Ltd., commercially available under the name of ethanol) was used instead of glycerin (manufactured by FUJIFILM Wako Co., Ltd., commercially available under the name of glycerin).

[0129] <Example 8> In Example 1, a UV absorbing composition was produced under the same conditions as in Example 1, except that the graphene quantum dots, water, and surfactant (RHEODOL AO-10V (nonionic surfactant) manufactured by Kao Corporation) were increased in the amounts shown in Table 1 and the amount of vaseline was reduced.

[0130] <Comparative Example 1> In Example 1, a UV absorbing composition was produced under the same conditions as in Example 1, except that a surfactant (RHEODOL AO-10V (nonionic surfactant, manufactured by Kao Corporation) was not used.

[0131] <Comparative Example 2> In Example 1, a UV absorbing composition was produced under the same conditions as in Example 1 except that water containing no carbon-based quantum dots was used.

[0132] [Table 1]

[0133] [Table 2]

[0134] The evaluation results are shown in Tables 1 and 2.

[0135] As shown in Table 1, in Example 1, a composition having excellent dispersibility and ultraviolet absorption function was obtained. Specifically, when the dispersibility of Example 1 was visually confirmed, Figure 1-2 As shown, it can be seen that just after filling ( Figure 1 ) and 1 month after filling ( Figure 2) have good dispersibility, and the whole is in a uniform state and maintains this state. It is believed that this is because vaseline is oily and the QD water dispersion is hydrophilic, and they cannot be directly mixed. The surface activity is produced by adding a surfactant. And it can be seen that if the dispersion state is good, it can exert excellent ultraviolet absorption function, especially the absorption of UVA (wavelength 315~380nm) and UVB (wavelength 280~315nm). On the other hand, in Comparative Example 1, no surfactant was added. As a result, when the dispersibility was visually confirmed, as shown in FIG. Figure 3 As shown in the figure, precipitation has already occurred just after filling, the dispersibility is poor, and the whole is not in a uniform state. It should be noted that one month after filling, precipitation has occurred in the same state as just after filling (no photo). In addition, the absorbance of Comparative Example 1 in Table 1 is - (horizontal line), and it is believed that since it is completely precipitated as described above, it is obvious that it does not have the ultraviolet absorption function even if it is measured. Therefore, by comparing Example 1 and Comparative Example 1, it is shown that in order to have excellent dispersibility and excellent ultraviolet absorption function, a surfactant needs to be added when an oily base is used.

[0136] Next, as shown in Table 1, in Example 2, the type of quantum dots was changed from graphene to carbon, and these also obtained compositions with the same performance as Example 1. In Example 3 and Example 4, the surfactant was changed from a nonionic system to an anionic system and a cationic system, respectively, but it can be seen that even if the type of surfactant is changed, a composition that maintains good dispersibility and also has an ultraviolet absorption function can be obtained. In addition, it is shown that in Example 8, by adding a surfactant of about 1 / 10 of the amount of water added, even if the amount of carbon-based quantum dots is increased, a composition having an ultraviolet absorption function while maintaining dispersibility can be obtained. On the other hand, in Comparative Example 2, carbon-based quantum dots were not added. By comparing Example 1 and Comparative Example 2, it is shown that in order to have an excellent ultraviolet absorption function, carbon-based quantum dots need to be present. As shown above, in order to use an oily base to obtain a composition having both excellent ultraviolet absorption function and dispersibility, a carbon-based quantum dot dispersion (solvent: water system) and a surfactant are required. It should be noted that all the oily bases in the examples and comparative examples described in Table 1 use vaseline, but since the aqueous dispersion of QD can be dispersed in a base with an extremely low polarity such as vaseline, it is believed that any base with a higher polarity than vaseline can be easily dispersed in the base.

[0137] on the other hand, Figure 4This is a graph obtained by further diluting the aqueous dispersion of QD used in Example 1 (QD concentration: 1.5 w / w%) with purified water in a manner such that the QD concentration shown in the figure is 0.0025 w / w% to 0.10 w / w%, and studying the absorption changes at various QD concentrations. When confirming the formulation, it is necessary to determine the degree of QD concentration that will produce the desired ultraviolet absorption effect. As a result, it can be seen from the absorption changes at wavelengths of 300nm to 400nm that the QD concentration of the aqueous dispersion of QD is preferably 0.01w / w% or more. It can also be seen that the organic ultraviolet absorbers used in commercially available sunscreens and the like cannot cover a wide range of wavelengths in a single component, but by using the QD in the present invention, a wide range of wavelengths such as 300nm to 400nm can be covered without the need to combine multiple components.

[0138] Figure 5 The aqueous dispersion of QD used in Example 1 (QD concentration: 1.5 w / w%) was adjusted with the amount of vaseline so that the final QD concentration became 0.15 w / w% to 3 w / w% as shown in the figure (in the case of 3 w / w%, QD concentration of 15 w / w% was used instead of 1.5 w / w%), and each sample was prepared. Each sample was applied to a polyethylene film in a thickness of about 25 μm and dried, and the results were measured using the above-mentioned measuring device and conditions to obtain the graph (corresponding to Examples 1, 1-1, and 1-2). It should be noted that, as a control, the same measurement was performed on only vaseline. As a result, it can be seen that the absorbance of the sample with graphene quantum dots added increased compared to that of only vaseline. It should be noted that in Figure 5 It can be seen that at any QD concentration, when the absorbance of vaseline (control) is set to 1 in the UVA range, i.e., at a wavelength of 350nm, an ultraviolet absorption function of 3.0 or more can be obtained, and when the absorbance of vaseline (control) is set to 1 in the UVB range, i.e., at a wavelength of 300nm, an ultraviolet absorption function of 3.0 or more can also be obtained.

[0139] Figure 6 and Figure 5 The same, but the absorption spectrum was measured for the sample after 2 months (corresponding to Examples 1, 1-1, and 1-2). The sample after 2 months is the measurement result of the sample that was in the state when it was made without dust or other foreign matter attached but was stored without sealing. An absorption of 0.5 to 1.0 can be confirmed in the range of 300nm to 450nm, and no degradation of the ultraviolet absorption effect was found. Especially above 400nm, the absorption increased compared to when it was made. It is believed that this is because there is no sealing, so the water loss and the QD concentration increase. Although the measured value is not recorded, it is confirmed that the weight of the sample after 2 months is reduced compared to the sample when it was made.

[0140] Next, as shown in Table 2, a study was conducted using a hydrophilic base. In Example 5, a composition having excellent dispersibility and ultraviolet absorption function was obtained. In Examples 6 and 7, although the hydrophilic base was changed from glycerol to ethoxydiglycol and ethanol, respectively, a composition having dispersibility and ultraviolet absorption function was obtained. The above shows that even if the oily base is changed to a hydrophilic base, the ultraviolet absorption function of QD will not be destroyed, and even if various types (Examples 5, 6, 7) and various concentrations (Examples 5, 5-1, 5-2) of hydrophilic bases are studied, there is no effect on the dispersibility and ultraviolet absorption function.

Claims

1. A composition for ultraviolet absorption, characterized in that Contains carbon quantum dots, water-based solvents, surfactants and oily bases.

2. A composition for ultraviolet absorption, characterized in that Contains carbon quantum dots, water-based solvents and hydrophilic bases.

3. The ultraviolet absorbing composition according to claim 1 or 2, wherein The content of the carbon-based quantum dots is 0.001 to 10 w / w % relative to the total amount of the composition.

4. The ultraviolet absorbing composition according to claim 1, wherein The surfactant is one or more selected from the group consisting of nonionic surfactants, anionic surfactants, cationic surfactants and amphoteric surfactants.

5. The ultraviolet absorbing composition according to claim 1, wherein The oily base is one or more selected from hydrocarbons, fatty acids, higher alcohols, ester oils, fats, waxes, siloxanes and silicones.

6. The ultraviolet absorbing composition according to claim 2, wherein The hydrophilic base is one or more selected from the group consisting of sugars, water-soluble polymers, polyols, cellulose derivatives, glycol ethers and lower alcohols.

7. A composition for ultraviolet absorption, characterized in that The ultraviolet absorbing composition according to claim 1 or 2 is formulated in the form of one or more selected from liquid, suspension, emulsion, cream, ointment, gel, liniment, spray, aerosol, poultice, tablet, powder and lotion.

8. A cosmetic material, characterized in that: The method comprises the ultraviolet absorbing composition according to claim 1 or 2.

9. A method for producing a composition for ultraviolet absorption, characterized in that: The method comprises the steps of mixing an aqueous dispersion containing carbon-based quantum dots and an aqueous solvent, a surfactant, and an oily base.

10. A method for producing a composition for ultraviolet absorption, characterized in that: The method comprises the step of mixing an aqueous dispersion containing carbon-based quantum dots and an aqueous solvent, and a hydrophilic base.

11. A method for absorbing ultraviolet light, characterized in that: A composition for ultraviolet absorption containing carbon quantum dots, an aqueous solvent, a surfactant and an oily base is used.

12. A method for absorbing ultraviolet light, characterized in that: A composition for ultraviolet absorption containing carbon quantum dots, an aqueous solvent and a hydrophilic base is used.

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