Double-agent type hair dye and use method thereof

Abstract

The invention relates to a double-agent hair dye and a use method thereof. The hair dye takes a melanin precursor as a dye intermediate, the double-agent type hair dye comprises an agent I and an agent II, and the agent I comprises the melanin precursor and an aqueous medium; the agent II comprises an alkaline agent and an aqueous medium, and the pH value of the agent II is 8-14; the double-agent hair dye further comprises a surfactant and a thickening agent, and the surfactant and the thickening agent at least exist in the agent I. According to the double-agent type hair dye, the alkaline agent and the dye intermediate mainly playing a hair dyeing role are divided into two agents, the agent I containing the dye intermediate is firstly used in the hair dyeing process, then the agent II containing the alkaline agent is used, and compared with a single-agent type hair dye, the double-agent type hair dye has the advantages that the coloring effect is better, the dyeing uniformity is better, and the product is easy to store.

Description

Technical Field

[0001] The present invention relates to the technical field of hair dyes, and in particular to a double-dose hair dye and a use method thereof. Background Art

[0002] As people's requirements for quality of life and personal image improve, the demand for dyeing gray hair into black hair or natural hair color continues to increase, and more and more people with gray hair want to use healthy hair dyes. According to the length of adhesion time, hair dyes are divided into temporary hair dyes, semi-permanent hair dyes and permanent hair dyes. Permanent hair dyes are highly sought after because of their long-lasting coloring characteristics.

[0003] The effective black dyeing ingredients in existing permanent hair dyes are mainly p-phenylenediamine and its derivatives. P-phenylenediamine hair dyes are also called oxidative hair dyes. The specific dyeing mechanism of this hair dye is to make the low relative molecular mass oxidative dye intermediates and other ingredients penetrate into the inner layer of the hair, undergo oxidative polymerization in the hair to generate macromolecular dyes and be locked in the hair. Oxidative hair dyes are almost all composed of three main reactive compounds: dye intermediates, coupling agents and oxidants. P-phenylenediamine hair dyes are mostly double-dose hair dyes, which store the dye intermediates and oxidants in two doses, mix and prepare the two doses before dyeing, and then apply them to the hair uniformly. The use of p-phenylenediamine hair dyes often causes allergic reactions, and causes the hair quality to become dry and deteriorate, and the dyed black hair looks abrupt and unnatural. Modern scientific research also shows that phenylenediamine and some of its derivatives are cumulative, rust-degenerative, and mutagenic, and can cause adverse effects such as keratitis, nephritis and leukemia.

[0004] 5,6-dihydroxyindole and its derivatives are important intermediates in the process of synthesizing melanin from tyrosine. Under alkaline conditions, they quickly oxidize and polymerize in the air to generate melanin. They have a good effect on the dyeing of keratin fibers and are basically non-irritating to human skin. They are very suitable as active ingredients in hair dyes. Since the dyeing effect of hair comes from the melanin generated by the oxidation and polymerization of dihydroxyindole, it is very close to natural black hair, and the dyed hair looks very natural. Currently, only the single-component hair dye of Kao Corporation is on the market. Since 5,6-dihydroxyindole and its derivatives need to be in alkaline conditions to be quickly oxidized by air to become melanin, the single-component hair dye needs to contain both dihydroxyindole and alkali, which leads to the following problems: 1. Since the single-component hair dye contains both dihydroxyindole and alkali, the single-component hair dye is very easy to deteriorate, and special packaging is required to solve the stability problem to a certain extent, thereby increasing the cost of using the single-component hair dye. 2. Due to the large molecular weight of melanin, it cannot be firmly combined with hair and its coloring activity on human hair is minimal, resulting in unsatisfactory dyeing effects of single-dose hair dyes. Continuous and repeated dyeing is required to achieve better dyeing effects.

[0005] Therefore, continuously improving the hair dyeing effect of 5,6-dihydroxyindole hair dyes is the goal pursued in the industry. Summary of the invention

[0006] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to provide a two-component hair dye and a method of using the same, so as to solve the problems of poor coloring effect, uniformity deviation and stability of single-component hair dye.

[0007] In order to achieve the technical effect, the technical solution adopted by the present invention is as follows:

[0008] The present invention provides a two-component hair dye, which uses a melanin precursor as a dye intermediate, and the two-component hair dye comprises: a component I and a component II, wherein the component I comprises a melanin precursor and an aqueous medium; the component II comprises an alkali agent and an aqueous medium, and the pH of the component II is 8-14;

[0009] The two-component hair dye further comprises a surfactant and a thickener, and the surfactant and the thickener are present in at least the first component;

[0010] The melanin precursor includes at least one of the compounds shown in the following formula I:

[0011]

[0012] In the formula, R 1 represents a hydroxyl group or an acetoxy group, R 2 Represents a hydrogen atom, -COOR or -COO - X + , wherein R is a hydrogen atom, a methyl group or an ethyl group, and X + is a cation, R 3 represents a hydrogen atom, an acetyl group, a methyl group or an ethyl group.

[0013] In the above two-component hair dye, as an optional method, the melanin precursor is 5,6-dihydroxyindole and / or 5,6-dihydroxyindole-2-carboxylic acid;

[0014] In the above two-component hair dye, as an optional method, the weight percentage of the dye intermediate in component I is 0.1-5%;

[0015] In the above two-component hair dye, as an optional mode, the alkali agent is an organic base, an inorganic base or a mixture of an organic base and an inorganic base;

[0016] In the above two-part hair dye, as an optional method, the pH of the II part is 9-14;

[0017] In the above two-component hair dye, as an optional mode, the aqueous medium as a solvent is water, or a mixture of water and alcohol;

[0018] In the above two-component hair dye, as an optional manner, the surfactant is at least one of a nonionic surfactant, an anionic surfactant, and an amphoteric surfactant.

[0019] In the above two-part hair dye, as an optional method, the surfactant is present in both Part I and Part II. In Part I, the mass percentage content of the surfactant is preferably 5-33%, and in Part II, the mass percentage content of the surfactant is preferably 2-35%.

[0020] In the above two-component hair dye, as an optional mode, the non-ionic surfactant is selected from any one or more of steareth-20, ceteareth-25, ceteareth-30, ceteareth-40, glyceryl monostearate, PEG-100 stearate, oleth-30, and oleth-40;

[0021] The anionic surfactant is selected from any one or more of sodium laureth sulfate, potassium cocoyl glycinate, sodium cocoyl glycinate, TEA cocoyl glutamate, sodium C14-16 olefin sulfonate, disodium lauroyl glutamate, alkyl glucosides, sodium lauroyl sarcosinate, sodium methyl cocoyl taurate, sodium lauroyl glutamate, sodium methyl lauroyl taurate, sodium cocoyl isethionate, potassium cocoyl glycinate, and sodium diethylhexyl sulfosuccinate;

[0022] The zwitterionic surfactant is selected from any one or more of cocamidopropyl betaine, disodium cocoamphodiacetate, lauroyl amidopropyl betaine, cocamidopropyl hydroxysulfonate, and sodium lauroyl amidoacetate.

[0023] In the above-mentioned two-part hair dye, as an optional method, in Part I, the mass percentage of the nonionic surfactant is 2-5%, the mass percentage of the anionic surfactant is 3-19%, and the mass percentage of the zwitterionic surfactant is 3-9%; in Part II, the mass percentage of the nonionic surfactant is 1-6%, the mass percentage of the anionic surfactant is 0.5-19%, and the mass percentage of the zwitterionic surfactant is 1-9%.

[0024] In the above two-component hair dye, as an optional manner, the thickener is a polymer thickener and / or an alcohol thickener.

[0025] In the above-mentioned two-part hair dye, as an optional manner, the thickener is present in both Part I and Part II; preferably, the thickener is present in both Part I and Part II, in Part I, the mass percentage of the thickener is greater than 0 and less than or equal to 25%; in Part II, the mass percentage of the thickener is greater than 0 and less than or equal to 25%.

[0026] In the above two-component hair dye, as an optional method, the two-component hair dye further includes an antioxidant;

[0027] In the above two-component hair dye, as an optional manner, the two-component hair dye further comprises a conditioner;

[0028] In the above two-component hair dye, as an optional manner, the two-component hair dye also includes fragrance.

[0029] In the above two-part hair dye, as an optional manner, the antioxidant is present in Part I; and the conditioner is present in Part I and Part II at the same time.

[0030] In the above two-component hair dye, as an optional method, the antioxidant is ascorbic acid and / or sodium sulfite; or / and, in component I, the mass percentage of the antioxidant is 0.5-15%;

[0031] In the above two-component hair dye, as an optional method, the conditioning agent is at least one of silicone substances, polyquaternium-7, and anti-hair loss care agents.

[0032] The present invention also provides a method for using the above-mentioned two-component hair dye, comprising: first evenly applying component I on the hair, then evenly applying component II on the hair dyed with component I, leaving it for 5-60 minutes and then rinsing the hair to complete the dyeing.

[0033] In the method for using the above two-component hair dye, as an optional method, the stay time is 5 to 30 minutes, preferably 15 minutes;

[0034] In the method for using the above two-component hair dye, as an optional method, the dosage ratio of the I component and the II component is 1:0.5-1.5 according to the mass ratio;

[0035] In the method of using the above two-part hair dye, as an optional method, after evenly applying Part I, wait for 0-1 minute and then apply Part II.

[0036] Compared with the prior art, the present invention has at least the following beneficial effects:

[0037] 1. The double-component hair dye of the present invention divides the alkali agent and the dye intermediate which mainly plays the role of hair dyeing into two components. In the hair dyeing process, component I containing the dye intermediate is used first, and then component II containing the alkali agent is used. Compared with the single-component hair dye of the same component, the double-component hair dye has a stronger coloring effect and better dyeing uniformity.

[0038] 2. The double-dose hair dye of the present invention has a short dyeing time. After applying the first and second agents, the hair can be left on for at least 5 minutes to achieve a good coloring effect and uniform dyeing.

[0039] 3. Furthermore, the dual-component hair dye of the present invention contains an antioxidant, wherein the antioxidant and the dye intermediate are present in at least the first component, which can increase the shelf life stability of the hair dye and prevent the dye intermediate from oxidative failure, and can enhance the dyeing ability of the hair dye.

[0040] 4. Furthermore, the two-component hair dye of the present invention contains a conditioner. After dyeing, the hair is smooth and soft without the need for shampoo and conditioner. That is, the hair dye of the present invention can omit the steps of shampooing and conditioning after dyeing. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 The hair dyes obtained in Example 1 of the present invention and Comparative Example 1 are respectively dyed using the method of the present invention and the method of Comparative Example 1;

[0042] Figure 2 The hair dye obtained in Example 1 of the present invention is dyed using the method of the present invention and the method of Comparative Example 2;

[0043] Figure 3 The hair dye obtained in Example 1 of the present invention and the hair dye obtained in Example 5 are both dyed using the method of the present invention. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme in the embodiment of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention.

[0045] The embodiments of the present invention are implemented on the premise of the technical solution of the present invention, and detailed implementation methods and processes are given, but the protection scope of the present invention is not limited to the following embodiments. The process parameters of the following embodiments that do not specify specific conditions are usually based on conventional conditions.

[0046] The endpoints and any values ​​of the ranges disclosed in the present invention are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be regarded as specifically disclosed in the present invention.

[0047] In the present invention, unless otherwise specified and / or illustrated, all % mentioned throughout are "mass percentages".

[0048] The specific techniques or conditions not specified in the examples were carried out according to the techniques or conditions described in the literature in the field or according to the product instructions. The reagents or instruments used without indicating the manufacturer were all conventional products that can be purchased through regular channels.

[0049] During the research and development of melanin precursors such as dihydroxyindole hair dyes, the inventor unexpectedly discovered that because dihydroxyindole and alkali are mixed together in a single-dose hair dye, and because dihydroxyindole is rapidly oxidized and polymerized by oxygen in the air to generate melanin in the presence of alkali, when the mixture of dihydroxyindole and alkali is applied to the hair, most of the dihydroxyindole has not yet had time to combine with the hair, but is rapidly oxidized and polymerized to generate melanin, so that the melanin stays on the surface of the hair for a short time, and its combination with the hair is not strong enough, resulting in a poor dyeing effect. Therefore, the inventor thought of first allowing dihydroxyindole to fully combine with the hair, and then being oxidized by air under alkaline conditions to polymerize to generate melanin, so that the melanin can be firmly combined with the hair, thereby improving the dyeing effect. To this end, the present invention proposes a two-component hair dye, that is, the alkali agent and the dye intermediate used to open the hair scales and provide oxidation conditions are divided into two doses, and the dose I containing the dye intermediate is used first and then the dose II containing the alkali agent is used. Compared with the single-component hair dye in which the dye intermediate and the alkali agent are mixed together, the two-component hair dye of the present invention has better coloring effect, uniform dyeing and better stability.

[0050] A specific embodiment of the present invention provides a two-component hair dye, which uses a melanin precursor as a dye intermediate, and the two-component hair dye comprises: an agent I and an agent II, wherein the agent I comprises a melanin precursor and an aqueous medium, and the agent II comprises an alkali agent and an aqueous medium, and the pH of the agent II is 8-14 (for example, the pH is 8.5, 9, 9.5, 10, 10.5, 11, 12, 12.5, 13, or 13.5); the two-component hair dye further comprises a surfactant and a thickener, and the surfactant and the thickener are present in at least the agent I;

[0051] The melanin precursor includes at least one of the compounds shown in the following formula I:

[0052]

[0053] In the formula, R 1 represents a hydroxyl group or an acetoxy group, R 2 Represents a hydrogen atom, -COOR or -COO - X + , wherein R is a hydrogen atom, a methyl group or an ethyl group, and X + is a cation, R 3 represents a hydrogen atom, an acetyl group, a methyl group or an ethyl group.

[0054] The compound shown in Formula I is a melanin precursor that can be converted into melanin by air oxidation. As an example, the melanin precursor can be 5,6-dihydroxyindole, 5,6-dihydroxyindole-2-carboxylic acid, 5,6-dihydroxyindoleline, 5,6-dihydroxyindoleline-2-carboxylic acid, etc. For dyeing hair into natural black, the melanin precursor is preferably 5,6-dihydroxyindole and / or 5,6-dihydroxyindole-2-carboxylic acid.

[0055] The content of the dye intermediate in agent I can be the conventional amount used in indole hair dyes. In a specific embodiment of the present invention, the weight percentage of the dye intermediate in agent I is 0.1-5% (e.g., 0.2%, 0.5%, 1%, 2%, 2.5%, 3%, 3.5%, 4%, or 4.5%).

[0056] The alkali agent can make the hair swell and open the hair scales, so that the dye intermediate can penetrate into the inside of the hair, and provide conditions for the dye intermediate to oxidatively polymerize in the hair. The alkali agent of the present invention is not particularly limited as long as it is an alkali agent used in common hair dyes. The alkali agent can be an organic base, an inorganic base, or a mixture of an organic base and an inorganic base. For example, it can be ammonia; alkanolamines such as monomethanolamine, dimethanolamine or trimethanolamine, monoethanolamine, diethanolamine or triethanolamine; alkylamines such as methylamine, dimethylamine, ethylamine, diethylamine, N-methylethylamine, propylamine, butylamine; arylalkylamines such as benzylamine; inorganic alkali compounds such as sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, etc. The alkali agent can be one or more of these bases. From the perspective of water solubility, the carbon number of the alkanolamine, alkylamine or arylalkylamine is preferably 10 or less, and more preferably 8 or less. In certain embodiments of the present invention, the alkaline agent is an alkanolamine, an inorganic base or a mixture of an alkanolamine and an inorganic base; the alkaline agent is preferably a combination of ethanolamine and potassium hydroxide.

[0057] The alkaline agent preferably maintains the pH of the agent II at 9-14 (eg, pH 9.5, 10, 10.5, or 11).

[0058] The aqueous medium is water, or a mixture of water and alcohol. The aqueous medium is used as a solvent. The alcohol can be a lower alcohol such as ethanol and isopropanol, or a diol or triol with a carbon number of less than 6 such as 1,3-butanediol, glycerol, ethylene glycol, and propylene glycol. The amount of the aqueous medium in Agent I is the balance, and the sum of its mass percentage with other components in Agent I is 100%. The amount of the aqueous medium in Agent II is the balance, and the sum of its mass percentage with other components in Agent II is 100%.

[0059] The surfactant used in the present invention may be a conventional surfactant used in common hair dyes, such as at least one of a nonionic surfactant, an anionic surfactant, a cationic surfactant, and an amphoteric surfactant. The surfactant of the present invention mainly functions to emulsify and disperse the dye intermediates, and to assist the dye intermediates to penetrate into the hair. In addition, some surfactants having a cleaning effect may be added to the hair dye of the present invention, so that there is no need to use shampoo to clean the hair and scalp after dyeing.

[0060] The nonionic surfactant is typically, but not limited to, selected from any one or more of steareth-20, ceteareth-25, ceteareth-30, ceteareth-40, glyceryl monostearate, PEG-100 stearate, oleth-30, and oleth-40. These nonionic surfactants are mild, low in irritation, and can play an emulsifying role.

[0061] The anionic surfactant is typically and non-limitingly selected from any one or more of sodium laureth sulfate, potassium cocoyl glycinate, sodium cocoyl glycinate, TEA cocoyl glutamate, sodium C14-16 olefin sulfonate, disodium lauroyl glutamate, alkyl glucosides, sodium lauroyl sarcosinate, sodium methyl cocoyl taurate, sodium lauroyl glutamate, sodium methyl lauroyl taurate, sodium cocoyl isethionate, potassium cocoyl glycinate, and sodium diethylhexyl sulfosuccinate. These anionic surfactants can act as emulsifiers, dye intermediate dispersions, dye intermediate penetrations, and detergents.

[0062] The zwitterionic surfactant is typically selected from any one or more of cocamidopropyl betaine, disodium cocoamphodiacetate, lauroyl amidopropyl betaine, cocamidopropyl hydroxysulfobetaine, and sodium lauroamphoacetate. These zwitterionic surfactants can reduce the irritation of the system and play the role of emulsifier, dye intermediate dispersion, dye intermediate penetration, and cleaning agent.

[0063] The cationic surfactant is typically, but not limited to, at least one selected from quaternary ammonium salts, pyridinium salts, etc. It can enhance the penetration of the dye intermediate into the hair.

[0064] In terms of usage effect, the surfactant is preferably present in both Agent I and Agent II, the mass percentage of the surfactant in Agent I is 5-33% (e.g., 6%, 10%, 15%, 20%, 22%, 24% or 26%), and the mass percentage of the surfactant in Agent II is 2-35% (e.g., 3%, 6%, 10%, 15%, 20%, 22%, 24% or 26%).

[0065] In a preferred embodiment of the present invention, the surfactant includes a nonionic surfactant, an anionic surfactant and a zwitterionic surfactant. Preferably, in agent I, the mass percentage of the nonionic surfactant is 2-5% (for example, 3%, 3.5%, 4% or 4.5%), the mass percentage of the anionic surfactant is 3-19% (for example, 5%, 8%, 10%, 12%, 14%, 16% or 18%), and the mass percentage of the zwitterionic surfactant is 3-9% (for example, 4%, 5%, 6%, 7%, 8% or 8.5%); in agent II, the mass percentage of the nonionic surfactant is 1-6% (for example, 2%, 4% or 5%), the mass percentage of the anionic surfactant is 0.5-19% (for example, 1%, 3%, 5%, 8%, 10%, 12%, 14%, 16% or 18%), and the mass percentage of the zwitterionic surfactant is 1-9% (for example, 2%, 4%, 5%, 6%, 7%, 8% or 8.5%).

[0066] The stability of hair dyes will vary slightly depending on the content of nonionic surfactants. When the content is too low, the emulsification effect is insufficient, and when it is too high, the cost is high and it is irritating, which is unnecessary. Anionic surfactants can be used as emulsifiers and detergents to disperse and penetrate dyes well. However, if the content is too low, it will affect the emulsification effect, dye dispersion and permeability, and the cleaning effect will also be affected. If the content is too high, the viscosity of the system will be affected and the irritation will be too great. Amphoteric surfactants can be used as emulsifiers and detergents to disperse and penetrate dyes well and reduce the irritation of the hair dye system. However, if the content is too low, it will affect the emulsification effect, dye dispersion and permeability, and the cleaning effect will also be affected. If the content is too high, the viscosity of the system will be affected and the irritation will be too great.

[0067] As an example of the present invention, the nonionic surfactant is steareth-20, the anionic surfactant is sodium laureth sulfate, and the amphoteric surfactant is cocamidopropyl betaine.

[0068] The thickener added to the double-component hair dye of the present invention can facilitate the actual operation of the hair dye, so that it can be evenly coated and attached to the hair. The thickener of the present invention can be a thickener commonly used in ordinary paste hair dyes, such as a nonionic or ionic polymer thickener or an alcohol thickener. The nonionic thickener can be hydroxyethyl cellulose, sodium carboxymethyl cellulose, hydroxyethyl cellulose hydroxypropyl octadecyl ether hydroxypropyl sodium sulfonate, hydroxypropyl methylcellulose, guar gum, pullulan, hydroxypropyl chitosan, etc. The ionic polymer thickener can be carrageenan, xanthan gum, polyacrylic acid, cationized cellulose derivatives, etc. The alcohol thickener can be cetearyl alcohol, C12-14 alcohol, etc.

[0069] The thickener is present in the agent I alone or in both the agent I and the agent II. The amount of the thickener used can ensure that the material adheres to the hair and can be combed and dyed smoothly. For some surfactants that also play a thickening role, if such surfactants are added, the amount of other thickeners added can be reduced as appropriate. Exemplarily, the thickener is present in both the agent I and the agent II. In the agent I, the mass percentage of the thickener is greater than 0 and less than or equal to 25%; in the agent II, the mass percentage of the thickener is greater than 0 and less than or equal to 25%.

[0070] As an example of the present invention, the thickener is hydroxyethylcellulose, cetearyl alcohol and C12-14 alcohol.

[0071] From the perspective of improving the shelf life and coloring effect, the two-component hair dye also includes an antioxidant. The antioxidant is present in the I component alone or in the II component alone or in both the I component and the II component. More preferably, the antioxidant is present only in the I component, and in the I component, the mass percentage of the antioxidant is 0.5-15% (such as 1%, 1.5%, 2%, 3%, 5%, 7%, 10%, 12% or 14%).

[0072] The main function of the antioxidant is to prevent premature oxidation of the dye intermediate in the hair dye and increase the shelf life. The antioxidant can be an antioxidant commonly used in ordinary hair dyes, such as ascorbic acid, sodium pyrosulfite, and sulfite.

[0073] As an example of the present invention, the antioxidants are ascorbic acid and sodium sulfite.

[0074] In a preferred embodiment of the present invention, the two-component hair dye further comprises a conditioning agent, which may be a silicone substance that improves smoothness during drying, such as dimethyl polysiloxane, amino-modified silicone (amino-terminated polydimethylsiloxane); the conditioning agent may also be an antistatic softener that makes the hair shiny, smooth and easy to comb, such as polyquaternium-7; the conditioning agent may also be an anti-hair loss care agent, such as Miyuan plant extract; the conditioning agent may also be a hair care substance Totalcera TM T5. Miyuan Plant Extract is a natural plant raw material developed for hair loss problems. It is mainly composed of Platycladus orientalis leaf extract, Zingiber officinale root extract, Trifolium pratense leaf extract and Artemisia argyi leaf extract.

[0075] The conditioning agent is present in the agent I alone or in the agent II alone or in both the agent I and the agent II. As a preferred embodiment, the conditioning agent is present in both the agent I and the agent II; the amount of the conditioning agent used can refer to the amount used in shampoo or conditioner.

[0076] The two-component hair dye of the present invention may also include other auxiliary agents used in ordinary hair dyes as needed, such as pH adjusters, anti-dandruff agents, bactericides, anti-inflammatory agents, preservatives, chelating agents, moisturizers, pearlescent agents, fragrances, ultraviolet absorbers, etc.

[0077] In order to improve the convenience of use and dyeing ability, the agent I and agent II of the double-agent hair dye of the present invention are preferably in the form of an emulsion, which can be evenly applied and attached to the hair, and can be combed and dyed smoothly without dripping.

[0078] In a specific embodiment of the present invention, the components and weight % of the first dose include the following:

[0079] Cetearyl Alcohol 3～7％； C12-14 alcohol 1～9％； Steareth-20 2～5％； Hydroxyethyl Cellulose 0.1～7％； Sodium Laureth Sulfate 3～16％； Sodium Methyl Cocoyl Taurate 1-3％； Cocamidopropyl Betaine 3～7％； Lauramidopropyl Betaine 1-2％； Sodium sulfite 0.3～10％； ascorbic acid 0.2～5％； 5,6-Dihydroxyindole 0.1～5％； Amodimethicone 0.1～10％； Polyquaternium-7 0.1～20％； <![CDATA[Totalcera TM T5]]> 0.001～5％； Hairdian AP 0.001～4％； essence 0.001～10％； Deionized water 30～72％；

[0080] The components and weight % of the II agent include the following:

[0081] Cetearyl Alcohol 2～7％； C12-14 alcohol 0.5～9％； Steareth-20 1～6％； Hydroxyethyl Cellulose 0.1～8％； Sodium Laureth Sulfate 3～16％； Sodium Methyl Cocoyl Taurate 1-3％； Cocamidopropyl Betaine 2～7％； Lauramidopropyl Betaine 1-2％； Amodimethicone 0.1～10％； Polyquaternium-7 0.1～20％； <![CDATA[Totalcera TM T5]]> 0～10％； Hairdian AP 0～10％； essence 0.001～10％； Ethanolamine 0.1～10％； Potassium hydroxide 0.1～10％； Deionized water 30～74％；

[0082] Agent I and Agent II in the two-part hair dye of the present invention can be prepared by conventional methods. For example, the preparation of Agent I includes: preparing an oil phase, preparing an aqueous phase, introducing the oil phase into the aqueous phase for homogenization and emulsification to obtain Agent I.

[0083] The preparation of Agent II includes: preparing an oil phase, preparing an aqueous phase, introducing the oil phase into the aqueous phase for homogenization and emulsification to obtain Agent II.

[0084] The following examples are all prepared using this method, and the examples section will not be repeated here.

[0085] The present invention also provides a method for using the above-mentioned two-component hair dye, firstly evenly applying component I on the hair, then evenly applying component II on the hair dyed with component I, leaving it for 5-60 minutes and then rinsing the hair to complete the dyeing.

[0086] The hair refers to animal fur or human hair containing keratin fibers.

[0087] In the above-mentioned method of use, as a preferred embodiment, the uniform coating method is to apply the dye evenly in small amounts multiple times and / or to apply the dye multiple times in different directions.

[0088] In the above-mentioned method of use, as a preferred embodiment, the residence time is 5 to 30 minutes, preferably 15 minutes.

[0089] When used, the dosage ratio of the I agent and the II agent is preferably 1:0.5 to 1.5 (for example: 1:0.7, 1:1, 1:1.2, or 1:1.4) according to the mass ratio;

[0090] Normally, after evenly applying Agent I, wait for 0-1 minute before applying Agent II. That is, there is no need to wait or apply Agent II immediately after applying Agent I.

[0091] After dyeing with the two-component hair dye of the present invention and the above-mentioned use method, the hair becomes smooth and soft without the need for shampoo and conditioner. That is, the hair dye of the present invention can omit the steps of shampooing and conditioning after dyeing.

[0092] The present invention will be further described in detail below with reference to specific embodiments.

[0093] Example 1

[0094] This embodiment provides a two-component hair dye, wherein:

[0095] The components and weight percentages of the first dose include the following:

[0096] essence 0.2％； Sodium sulfite 1.2％； ascorbic acid 1.6％； 5,6-Dihydroxyindole 2％； Amodimethicone 2％； Polyquaternium-7 2％； Steareth-20 4％； Cetearyl Alcohol 5％； Hydroxyethyl Cellulose 5.2％； Cocamidopropyl Betaine 6.6％； Lauramidopropyl Betaine 2％； C12-14 alcohol 7％； Sodium Laureth Sulfate 14.2％； Sodium Methyl Cocoyl Taurate 3％； Deionized water 44％；

[0097] The components and weight percentages of Agent II include the following:

[0098] essence 0.2％； Potassium hydroxide 2.4％； Polyquaternium-7 2％； Amodimethicone 2％； Ethanolamine 4.4％； Steareth-20 4％； Cetearyl Alcohol 5％； Hydroxyethyl Cellulose 5.2％； Cocamidopropyl Betaine 6.6％； Lauramidopropyl Betaine 2％； C12-14 alcohol 7％； Sodium Laureth Sulfate 14.2％； Sodium Methyl Cocoyl Taurate 3％； Deionized water 42％；

[0099] The pH of dose II was 12.79.

[0100] Example 2

[0101] This embodiment provides a two-component hair dye, wherein:

[0102] The components and weight percentages of the first dose include the following:

[0103] essence 0.2％； ascorbic acid 0.8％； Sodium sulfite 2％； 5,6-Dihydroxyindole 2％； Amodimethicone 2％； Polyquaternium-7 2％； Steareth-20 4％； Cetearyl Alcohol 5％； Hydroxyethyl Cellulose 5.2％； Cocamidopropyl Betaine 6.6％； Lauramidopropyl Betaine 2％； C12-14 alcohol 7％； Sodium Laureth Sulfate 14.2％； Sodium Methyl Cocoyl Taurate 3％； Deionized water 44％；

[0104] The components and weight % of the II agent of this embodiment are the same as the formulation of the II agent in Example 1.

[0105] Example 3

[0106] The components and weight % of the first dose of this embodiment are the same as the first dose formula in Example 1.

[0107] The components and weight % of the II agent of this embodiment include the following:

[0108] essence 0.2％； Potassium hydroxide 2.0％ Ethanolamine 2.0％； Amodimethicone 2％； Polyquaternium-7 2％； Steareth-20 4％； Cetearyl Alcohol 5％； Hydroxyethyl Cellulose 5.2％； Cocamidopropyl Betaine 6.6％； Lauramidopropyl Betaine 2％； C12-14 alcohol 7％； Sodium Laureth Sulfate 14.2％； Sodium Methyl Cocoyl Taurate 3％； Deionized water 44.8％；

[0109] The pH of dose II was 12.0.

[0110] Example 4

[0111] This embodiment provides a two-component hair dye, wherein:

[0112] The components and weight percentages of the first dose include the following:

[0113]

[0114]

[0115] The components and weight percentages of Agent II include the following:

[0116] Potassium hydroxide 2.4％； Ethanolamine 4.4％； Steareth-20 4％； Cetearyl Alcohol 5％； Hydroxyethyl Cellulose 5.2％； Cocamidopropyl Betaine 6.6％； Lauramidopropyl Betaine 2％； C12-14 alcohol 7％； Sodium Laureth Sulfate 14.2％； Sodium Methyl Cocoyl Taurate 3％； Deionized water 46.2％

[0117] The pH of dose II was 12.75.

[0118] Example 5

[0119] The double-component hair dye provided in this embodiment has the same ingredients and contents as those of the I component in Example 1, except that the weight percentage of 5,6-dihydroxyindole in component I is 0.2% and the weight percentage of deionized water is 45.8%. The formulation of component II in this embodiment is the same as that of component II in Example 1.

[0120] Example 6

[0121] This embodiment provides a two-component hair dye, wherein:

[0122] The components and weight percentages of the first dose include the following:

[0123]

[0124]

[0125] The components and weight percentages of Agent II include the following:

[0126] essence 0.2％； Potassium hydroxide 2.4％； Polyquaternium-7 3％； Amodimethicone 3％； Ethanolamine 4.4％； Steareth-20 5％； Cetearyl Alcohol 6％； Hydroxyethyl Cellulose 6.2％； Cocamidopropyl Betaine 6.6％； Disodium Cocoamphodiacetate 2％ C12-14 alcohol 7％； Sodium Laureth Sulfate 14.2％； Deionized water 40％；

[0127] The pH of dose II was 12.35.

[0128] Example 7

[0129] The components and weight percentages of the first dose include the following:

[0130] essence 0.2％； Sodium sulfite 2％； ascorbic acid 0.8％； 5,6-Dihydroxyindole 2％； Amodimethicone 2％； Polyquaternium-7 2％； Steareth-20 4％； Cetearyl Alcohol 5％； Cocamidopropyl Betaine 6.6％； Lauramidopropyl Betaine 2％； C12-14 alcohol 7％； Hydroxyethyl Cellulose 10.4％； Sodium Laureth Sulfate 14.2％； Sodium Methyl Cocoyl Taurate 3％； Deionized water 38.8％；

[0131] The components and weight percentages of Agent II include the following:

[0132]

[0133]

[0134] Comparative Example 1

[0135] This comparative example provides a single-component hair dye, and the components of the single-component hair dye are as follows in terms of mass percentage:

[0136] essence 0.2％； Sodium sulfite 0.6％； Potassium hydroxide 1.2％； ascorbic acid 0.8％； 5,6-Dihydroxyindole 1％； Ethanolamine 2.2％； Amodimethicone 2％； Polyquaternium-7 2％； Steareth-20 4％； Cetearyl Alcohol 5％； Hydroxyethyl Cellulose 5.2％； Cocamidopropyl Betaine 6.6％； Lauramidopropyl Betaine 2％； C12-14 alcohol 7％； Sodium Laureth Sulfate 14.2％； Sodium Methyl Cocoyl Taurate 3％； Deionized water 43％；

[0137] Hair dye effect test

[0138] Example of use of the present invention

[0139] The hair dyes obtained in Examples 1-7 are used for hair dyeing, and the specific method of use is as follows:

[0140] Among them, the use of double-dose hair dye is as follows:

[0141] (1) Squeeze 1g of Agent I onto a flat comb and comb and dye evenly on 5g of completely dry white hair in small amounts and multiple times. After Agent I is combed and dyed evenly, immediately proceed with Agent II in the same manner;

[0142] (2) For both Agent I and Agent II, leave the dye on for 20 minutes and then rinse with water to complete the dyeing process.

[0143] Comparative use example 1

[0144] The method of using the single-dose hair dye of Comparative Example 1 is as follows:

[0145] (1) Squeeze 2 g of the single dose of hair dye of Comparative Example 1 onto a flat comb, and evenly comb and dye it onto 5 g of completely dry white hair in small amounts and multiple times;

[0146] (2) After dyeing is evenly applied, leave the dye on for 20 minutes and then rinse with water to complete the dyeing process.

[0147] Comparative Use Example 2

[0148] The hair dyes obtained in Examples 1-7 are used for hair dyeing, and the specific method of use is as follows:

[0149] Among them, the use of double-dose hair dye is as follows:

[0150] (1) Squeeze 1g of Agent II onto a flat comb, and comb and dye evenly on 5g of completely dry white hair in small amounts and multiple times. After Agent II is combed and dyed evenly, immediately comb and dye Agent I in the same way;

[0151] (2) For both Agent I and Agent II, leave the dye on for 20 minutes and then rinse with water to complete the dyeing process.

[0152] The hair dyeing effects of the hair dyes obtained in Examples 1-7 and Comparative Example 1 were evaluated, and a white hair bundle not using any hair dye was taken as a blank control. Figure 1 As shown in Table 1, the evaluation standard is set to 0-10, "0" means that the degree of dyeing of the dyed hair bundle is no different from that of the blank control, and the larger the number, the darker the degree of dyeing of the dyed hair bundle compared with the blank control. The hair dyeing effect of each hair dye is evaluated by a five-person expert panel by visually comparing each dyed hair bundle with the blank control, and the average value is taken as the final evaluation result of the hair dye, as shown in Table 1, and the numerical evaluation in Table 1 is the average value of the five people's evaluation.

[0153] Table 1 Evaluation table of hair dyeing effects of the hair dyes obtained in Examples 1-7 and Comparative Example 1

[0154]

[0155] In addition, the dyeing results of Example 1 (i.e., double agent) and Comparative Example 1 (i.e., single agent) are as follows: Figure 1 As shown in the figure, it can be seen that the color of hair dyed with the double-agent hair dye of Example 1 is much darker, darker, and closer to the natural color than the color of hair dyed with the single-agent hair dye of Comparative Example 1. Therefore, it can be seen that the double-agent hair dye of the present invention has a better hair dyeing effect than the single-agent hair dye.

[0156] Figure 2 The hair dye obtained in Example 1 is used to color white hair bundles using the methods of Example 1 of the present invention and Comparative Example 2, respectively. Figure 2 It can be seen that the coloring effect of the method of Example 1 of the present invention is better, which is consistent with the results in Table 1.

[0157] Figure 3 The hair dyes obtained in Example 1 and Example 5 are both colored using the method of Example 1 of the present invention to color white hair bundles. Figure 3It can be seen that when the dosage of the dye intermediate is adjusted to only 0.2% in agent I, the coloring effect can reach the effect of 1% in the single-dose hair dye, which once again shows that under the same dosage of active ingredients, the two-dose hair dye of the present invention has a better coloring effect.

[0158] Although the present invention has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements may be made thereto based on the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection claimed by the present invention.

Claims

1. A two-component hair dye, characterized in that: The melanin precursor is used as a dye intermediate. The double-component hair dye comprises: component I and component II, wherein component I comprises a melanin precursor and an aqueous medium; component II comprises an alkali agent and an aqueous medium, and the pH of component II is 8-14; The two-component hair dye further comprises a surfactant and a thickener, and the surfactant and the thickener are present in at least the first component; The melanin precursor includes at least one of the compounds shown in the following formula I: In the formula, R 1 represents a hydroxyl group or an acetoxy group, R 2 Represents a hydrogen atom, -COOR or -COO - X + , wherein R is a hydrogen atom, a methyl group or an ethyl group, and X + is a cation, R 3 represents a hydrogen atom, an acetyl group, a methyl group or an ethyl group.

2. The two-component hair dye according to claim 1, characterized in that: The melanin precursor is 5,6-dihydroxyindole and / or 5,6-dihydroxyindole-2-carboxylic acid; And / or, the weight percentage of the dye intermediate in agent I is 0.1-5%; And / or, the alkali agent is an organic base, an inorganic base or a mixture of an organic base and an inorganic base; and / or, the pH of the agent II is 9-14; and / or, the aqueous medium as solvent is water, or a mixture of water and alcohol; And / or, the surfactant is at least one of a nonionic surfactant, an anionic surfactant, and an amphoteric surfactant.

3. The two-component hair dye according to claim 2, characterized in that: The surfactant is present in both the agent I and the agent II. In the agent I, the mass percentage content of the surfactant is preferably 5-33%, and in the agent II, the mass percentage content of the surfactant is preferably 2-35%.

4. The two-component hair dye according to claim 3, characterized in that: The nonionic surfactant is selected from any one or more of steareth-20, ceteareth-25, ceteareth-30, ceteareth-40, glyceryl monostearate, PEG-100 stearate, oleth-30, and oleth-40; The anionic surfactant is selected from any one or more of sodium laureth sulfate, potassium cocoyl glycinate, sodium cocoyl glycinate, TEA cocoyl glutamate, sodium C14-16 olefin sulfonate, disodium lauroyl glutamate, alkyl glucosides, sodium lauroyl sarcosinate, sodium methyl cocoyl taurate, sodium lauroyl glutamate, sodium methyl lauroyl taurate, sodium cocoyl isethionate, potassium cocoyl glycinate, and sodium diethylhexyl sulfosuccinate; The zwitterionic surfactant is selected from any one or more of cocamidopropyl betaine, disodium cocoamphodiacetate, lauroyl amidopropyl betaine, cocamidopropyl hydroxysulfonate, and sodium lauroyl amidoacetate; And / or, in agent I, the mass percentage of nonionic surfactant is 2-5%, the mass percentage of anionic surfactant is 3-19%, and the mass percentage of zwitterionic surfactant is 3-9%; in agent II, the mass percentage of nonionic surfactant is 1-6%, the mass percentage of anionic surfactant is 0.5-19%, and the mass percentage of zwitterionic surfactant is 1-9%.

5. The two-component hair dye according to any one of claims 1 to 4, characterized in that: The thickener is a polymer thickener and / or an alcohol thickener; Or / and, the thickener is present in both Agent I and Agent II; preferably, the thickener is present in both Agent I and Agent II, in Agent I, the mass percentage of the thickener is greater than 0 and less than or equal to 25%; in Agent II, the mass percentage of the thickener is greater than 0 and less than or equal to 25%.

6. The two-component hair dye according to any one of claims 1 to 4, characterized in that: The two-component hair dye further comprises an antioxidant; Or / and, the two-component hair dye further comprises a conditioner; Or / and, the two-component hair dye further comprises fragrance.

7. The two-component hair dye according to claim 6, characterized in that: The antioxidant is present in the I agent; The conditioning agent is present in both the agent I and the agent II.

8. The two-component hair dye according to claim 7, characterized in that: The antioxidant is ascorbic acid and / or sodium sulfite; Or / and, in agent I, the mass percentage of the antioxidant is 0.5-15%; The conditioning agent is at least one of silicone substances, polyquaternium-7, and anti-hair loss care agents.

9. The method for using the two-component hair dye according to any one of claims 1 to 8, characterized in that: include: First, apply Agent I evenly on the hair, and then apply Agent II evenly on the hair dyed with Agent I. Leave it on for 5-60 minutes and then rinse the hair to complete the dyeing.

10. The method for using the two-component hair dye according to claim 9, characterized in that: The residence time is 5 to 30 minutes, preferably 15 minutes; And / or, in terms of mass ratio, the dosage ratio of the agent I to the agent II is 1:0.5-1.5; And / or, after evenly applying Agent I, wait for 0-1 min and then apply Agent II.

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