A hair dyeing composition, its preparation and use

Abstract

The present application provides a hair dyeing composition and its preparation method and application, wherein the hair dyeing composition comprises the following components by mass percentage: emulsifier i: 0.1-13%, polydihydroxyindole: 0.01-10%, ethanol or polyhydric alcohol: 0.01-50%, antioxidant: 0-1%, penetration enhancer: 0.1-2%, pH regulator i: 0.001-10%, deionized water: the balance. The present application uses polydihydroxyindole as a hair dyeing active ingredient, and the hair dyeing product prepared from the hair dyeing composition prepared by combining emulsifier i has good mildness, no irritation to the scalp, good stability of polydihydroxyindole in the formula, high dyeing color fastness, excellent effect, and can improve the softness of the hair, and has the effect of hair care while dyeing the hair.

Description

Technical Field

[0001] This invention relates to the field of daily cosmetics, specifically to a hair dyeing composition, its preparation method, and its application. Background Technology

[0002] The demand for hair dye products is increasing. Traditional hair dyes contain various chemical components such as ammonia and aromatic amines, which may cause skin allergies and scalp irritation. Long-term use may also damage the skin and hair. In recent years, more hair dye products with natural ingredients, such as plant-based hair dyes and melanin-based hair dyes, have appeared on the market, aiming to reduce negative impacts on health and the environment.

[0003] 5,6-Dihydroxyindole is a novel hair dye ingredient. As a precursor to melanin, it oxidizes in air to form melanin. The melanin converted from dihydroxyindole has a structure similar to that of human hair melanin, exhibiting good affinity and a natural color. Currently, some hair dye products abroad use 5,6-dihydroxyindole. However, its small molecular weight allows it to easily penetrate the scalp, posing a potential risk. Several national laboratories (SCCP / 0952 / 05) have conducted toxicological experiments on 5,6-dihydroxyindole according to GLP procedures and OECD methodological guidelines, and based on these findings, have issued safety assessments and recommended concentrations. It is recommended that the amount of 5,6-dihydroxyindole added as a hair dye should be below 0.50%, which limits its use in dyeing products to some extent. Summary of the Invention

[0004] To address the aforementioned problems, the present invention provides a hair dyeing composition that provides excellent hair dyeing results, is harmless to the scalp and hair, and can be used as a scalp conditioner, making it suitable for home hair dyeing.

[0005] To achieve this objective, one aspect of the present invention provides a hair dye composition, wherein, by weight percentage, the hair dye composition comprises the following components: Emulsifier i: 0.1~13%, Polydihydroxyindole: 0.01%~10%, Ethanol or polyols: 0.01%~50%, Antioxidants: 0%~1%, Penetration enhancer: 0.1~2%, pH adjuster i: 0.001%~10%, Deionized water: balance, wherein the emulsifier i comprises anionic emulsifier.

[0006] Furthermore, the pH value of the hair dye composition is 5-7 (25°C), preferably 5-6.

[0007] Furthermore, the anionic emulsifier is selected from one or more of alkyl taurate and alkyl glutamate emulsifiers, preferably sodium methyl stearoyl taurate and / or sodium stearoyl glutamate.

[0008] Furthermore, the content of the anionic emulsifier ranges from 0.1% to 10%, preferably from 1% to 4.5%.

[0009] Furthermore, the emulsifier i also includes a nonionic emulsifier, which can further help improve the stability of the product. The nonionic emulsifier is selected from glyceryl esters, preferably one or more of glyceryl stearate / PEG-100 glyceryl stearate and glyceryl stearate SE. Furthermore, the content of the nonionic emulsifier ranges from 0 to 3%, preferably 0.2 to 2%.

[0010] If no anionic emulsifier is added and only a nonionic emulsifier is used, the hair dye will turn brown after dyeing.

[0011] Further, the molecular weight of the polydihydroxyindole is 300-800, for example 447, and the content of the polydihydroxyindole is 0.1%-3%, preferably 1.5-3.5%.

[0012] Furthermore, the mass ratio of polydihydroxyindole to emulsifier i is 0.5~0.8. However, when the emulsifier content is low, the polydihydroxyindole cannot be fully deposited on the hair, resulting in poor hair dyeing effect. When the emulsifier content is too high, the polydihydroxyindole cannot be evenly dispersed, affecting the user experience during dyeing. The ethanol or polyol is used to dissolve the polydihydroxyindole, and its mass ratio to polydihydroxyindole is 1:50 to 50:1, preferably 1:1 to 1:20.

[0013] The polyol is selected from one or more of propylene glycol, dipropylene glycol, 1,3-butanediol, glycerin, dimeric glycerin, and polyethylene glycol, and the content of the ethanol or polyol is 0.1% to 10%.

[0014] The antioxidant is selected from one or more of ascorbic acid or its salt and sulfite. Further, when the ascorbic acid or its salt is selected from ascorbic acid or sodium ascorbate, the content is 0% to 1%, more preferably 0.05% to 0.5%.

[0015] The sulfite is selected from sodium metabisulfite, and its content is 0% to 1%, more preferably 0.05% to 0.5%.

[0016] Furthermore, the penetration enhancer is used to increase the coloring effect of polydihydroxyindole in the dyeing composition, and the penetration enhancer is potassium iodide with a content of 0.2-2%, more preferably 0.4-0.8%.

[0017] The mass ratio of polydihydroxyindole to potassium iodide is 3-5.5. If the potassium iodide content is too low, the polydihydroxyindole has poor permeability and is difficult to penetrate and stain; however, if the potassium iodide content is too high, it will interfere with the reaction of polydihydroxyindole, resulting in poor staining effect.

[0018] The pH adjuster i is used to adjust the formulation system to a suitable pH range, and is selected from one or more of arginine, monoethanolamide, diethanolamine, triethanolamine, isopropanolamine, 2-amino-2-methylpropanol, 2-aminobutanol, sodium hydroxide, potassium hydroxide, and tetrahydroxypropylethylenediamine, with a preferred content of 0.005% to 3%.

[0019] Furthermore, the hair dye composition further comprises a fatty alcohol, which is selected from one or more of cetyl alcohol, stearyl alcohol, cetearyl alcohol, behenyl alcohol, and myristyl alcohol, and the content of the fatty alcohol is 1% to 15%, preferably 3% to 10%.

[0020] The present invention also provides a method for preparing the above-mentioned hair dye composition, wherein the method is selected from the following steps: 1) Add deionized water, emulsifier i, and fatty alcohol to the reaction vessel, heat to 80-85℃, and mix thoroughly; 2) Cool down to below 45°C, add the pre-dispersed sulfite and ascorbic acid or its salt to the reaction vessel, and mix well; 3) Add the iodide pre-dispersed in deionized water to the reaction vessel and stir until homogeneous; 4) Add pH adjuster i to the reaction vessel and stir until homogeneous; 5) Purge the air in the reaction vessel with nitrogen, add polyol and / or ethanol and polydihydroxyindole, mix well and fill into the container.

[0021] Another aspect of the present invention provides a hair dyeing product comprising agent 1, agent 2, and agent 3, wherein... The first agent comprises the above-described hair dye composition; Agent 2: By mass percentage, Agent 2 comprises the following components: Emulsifier II: 0.5%~10%, Fatty alcohol: 1%~15%, Peroxide: 1%~10%, pH adjuster II: 0.01~1%, Solvent balance; 3. The 3. Agents comprise, by weight percentage, the following components: emulsifier II: 0.5-10%, fatty alcohol: 1%-15%, pH adjuster I: 0.1%-10%, and solvent balance; The mass ratio of agent 1: agent 2: agent 3 is 1.5~3:1:1.

[0022] Furthermore, the pH value of the two agents is 3 to 4.

[0023] Further, the emulsifier ii is a mixture of fatty alcohol polyethers and glyceryl stearate SE, wherein the fatty alcohol polyether is preferably cetearyl alcohol polyether-25, and further, the content of cetearyl alcohol polyether-25 is preferably 2-4%, and the content of glyceryl stearate SE is preferably 0.5-1.5%. In the agent 2, the fatty alcohol is cetearyl alcohol, with a content of 3% to 10%; preferably 3% to 5%.

[0024] Further, the peroxide is selected from one or more of hydrogen peroxide, sodium carbonate peroxide, sodium peroxide, and potassium peroxide. Preferably, the peroxide is hydrogen peroxide, and the content of hydrogen peroxide is preferably 1 to 4%.

[0025] The pH adjuster ii is selected from one or more of lactic acid, citric acid, succinic acid, and malic acid.

[0026] Furthermore, the two agents may further include a chelating agent, which is selected from one or more of EDTA-2Na and hydroxyethyl diphosphate, and has a content of 0.01-1%.

[0027] Furthermore, the solvent in the two agents is deionized water or ethanol.

[0028] Furthermore, the pH range for the 3-dose formulation is 11-12.

[0029] Of the three agents, the emulsifier ii is a mixture of fatty alcohol polyethers and glyceryl stearate SE, wherein the fatty alcohol polyether is preferably cetearyl alcohol polyether-25, and the content of cetearyl alcohol polyether-25 is 2~4%; the content of glyceryl stearate SE is 0.5~1.5%.

[0030] Of the three agents, fatty alcohol is preferred, specifically cetearyl alcohol, with a content of 3% to 10%, more preferably 3% to 5%.

[0031] Furthermore, the content of pH adjuster i in the three agents is preferably 0.5% to 3%.

[0032] The present invention further provides a method of using a hair dye product, wherein the method includes the following steps: at room temperature, apply hair dye agent 1 to clean gray hair and leave it for 30 to 50 minutes; then mix hair dye agent 2 and agent 3, apply them to the gray hair covered by hair dye agent 1, leave it for 10 to 15 minutes, and then wash it off.

[0033] The mass ratio of hair dye agent 1: hair dye agent 2: hair dye agent 3 is 1.5~3:1:1.

[0034] In the hair dyeing product of this invention, agents 2 and 3 can be effectively applied to the area covered by agent 1, while allowing the hair dye molecules of agent 1 to better penetrate into the scalp and enhance the dyeing effect.

[0035] Simultaneously, after using the hair dye product of this invention, the hair has low oiliness and stickiness, good smoothness, and high texture and comfort. Furthermore, polydihydroxyindole has good fixation in the hair, resulting in long-lasting coloring effects.

[0036] The positive and progressive effects of invention are: 1) In the technical solution disclosed in this invention, the hair dyeing composition prepared by using polydihydroxyindole as a hair dyeing agent in combination with emulsifier i is safe and non-toxic. During the preparation, nitrogen gas is used to protect polydihydroxyindole, which is not prone to oxidation reaction. The resulting hair dyeing composition has good storage stability.

[0037] 2) The hair dyeing product disclosed in this invention has a moderate viscosity, achieving excellent dyeing results during the hair conditioning process. It further reduces damage to the hair during dyeing, can be used at room temperature, and is easy to operate. A good black dyeing effect can be achieved with just one application. After dyeing, the hair has low oiliness and stickiness, good smoothness, and high texture and comfort.

[0038] 3) In the hair dyeing product disclosed in this invention, agent 1 plays a role in increasing the penetration of polydihydroxyindole, resulting in a long-lasting dyeing effect. Agents 2 and 3 cause the dyeing substance to oxidize and reveal a natural black color. When agents 3 are mixed, they work synergistically to achieve a natural color fixation and hair care effect, resulting in high color fastness, natural and even dyeing, and excellent dyeing effect. Attached Figure Description

[0039] Figure 1 The first dose prepared under nitrogen purging conditions in Example 1 Figure 2 Example 1: The preparation of one dose under nitrogen-free conditions as described in the control example. Figure 3 Photos of hair before dyeing and after dyeing in Examples 1-4, from left to right: before dyeing, after dyeing in Examples 1-4. Figure 4 Comparative examples 1-7: photos after hair dyeing, from left to right. Figure 5 Combing performance test results of Example 1 and Comparative Example 8 Detailed Implementation

[0040] The present invention is further illustrated below by way of embodiments, but the invention is not limited to the scope of the embodiments described herein. Experimental methods in the following embodiments that do not specify specific conditions were performed according to conventional methods and conditions, or as selected according to the product instructions.

[0041] Example 1: Preparation of hair dye composition (agent 1) Add deionized water, 3 parts of sodium methylstearoyl taurate emulsifier, 1 part of glyceryl stearate / PEG-100 stearate, and 7 parts of cetearyl alcohol to a reaction vessel, heat to 80°C, and mix thoroughly. Cool to below 45°C, add 0.15 parts of sodium sulfite pre-dispersed in deionized water and 0.3 parts of ascorbic acid to the reaction vessel, and mix well; Add 0.6 parts of potassium iodide pre-dispersed in deionized water to the reaction vessel and stir until homogeneous; Add arginine and preservative to the reaction vessel and stir until well mixed; Purge the air in the reaction vessel with nitrogen to ensure that there is no air in the reaction vessel. Add 4 parts of pre-dispersed ethanol and 2 parts of polydihydroxyindole and mix well. Photographs of the prepared hair dye composition, obtained by filling the material into aluminum foil bags or aerosol cans, are attached. Figure 1 .

[0042] Comparison Example The raw materials and amounts added in steps 1-5 are the same as in Example 1, except that nitrogen is not introduced in step 5. A photograph of the prepared hair dye composition is attached. Figure 2 .

[0043] From the appendix Figure 1 , attached Figure 2 It is known that since polydihydroxyindole is a substance that is easily oxidized, if exposed to air, the material will easily oxidize and turn black, affecting the dyeing effect. Therefore, when preparing or packaging hair dyeing composition 1, an inert gas must be introduced to avoid contact with oxygen and discoloration.

[0044] Preparation of Agent 2: Mix deionized water, 4 parts cetearyl alcohol, 3 parts cetearyl alcohol polyether-25, and 1 part glyceryl stearate SE at 80°C until homogeneous. Add 2.5 parts hydrogen peroxide and an appropriate amount of lactic acid, mix at 45°C until homogeneous, and adjust the pH to 3.5.

[0045] Preparation of Agent 3: Mix deionized water, 4 parts cetearyl alcohol, 3 parts cetearyl alcohol polyether-25, and 1 part glyceryl stearate SE at 80°C until homogeneous. Add an appropriate amount of ethanolamine and mix at 45°C until homogeneous. Adjust the pH value to 11.5.

[0046] Example 2 In Example 2, the other raw materials for Agent 1 are prepared in the same way as in Example 1, except that the emulsifier used is 3 parts sodium methylstearoyl taurate and 1 part glyceryl stearate / PEG-100 stearate. Agents 2 and 3 are the same as in Example 1.

[0047] Example 3 In Example 3, the other raw materials for Agent 1 were prepared in the same way as in Example 1, except that the emulsifier used was 4 parts sodium methylstearoyl taurate. The amount of polydihydroxyindole added was 3 parts, and the amount of ethanol was adjusted to 5 parts accordingly. Agents 2 and 3 were the same as in Example 1.

[0048] Example 4 In Example 4, the other raw materials for Agent 1 were prepared in the same way as in Example 1, except that the emulsifier used was 4 parts of sodium methylstearoyl taurate. The amount of polydihydroxyindole added was 2.5 parts, and the amount of ethanol was adjusted to 5 parts accordingly. Agents 2 and 3 were the same as in Example 1.

[0049] The raw materials and dosages for Examples 1-4 are shown in Table 1:

[0050] Comparative Example 1 In Comparative Example 1, the other raw materials of Agent 1 were prepared in the same way as in Example 1, except that the emulsifier used was 4 parts of nonionic emulsifier glyceryl stearate / PEG-100 stearate, and no anionic emulsifier was used.

[0051] Comparative Example 2 In Comparative Example 2, the other raw materials of Agent 1 were prepared in the same way as in Example 1, except that the emulsifier was replaced by 3 parts of cationic surfactant behenyltrimethylammonium chloride and 1 part of nonionic emulsifier glyceryl stearate / PEG-100 stearate.

[0052] Comparative Example 3 In Comparative Example 3, the other raw materials of Agent 1 were prepared in the same way as in Example 1, except that the emulsifier was replaced by 3 parts of cationic surfactant stearyltrimethylammonium chloride and 1 part of nonionic emulsifier glyceryl stearate / PEG-100 stearate.

[0053] Comparative Example 4 In Comparative Example 4, the other raw materials for Agent 1 were prepared in the same way as in Example 1, except that potassium iodide was not added.

[0054] Comparative Example 5 In Comparative Example 5, the other raw materials for Agent 1 were prepared in the same way as in Example 1, except that the amount of potassium iodide added was 3 parts.

[0055] Comparative Example 6 In Comparative Example 6, the other raw materials for Agent 1 were prepared in the same way as in Example 1, except that the amount of potassium iodide added was 0.1 parts.

[0056] Comparative Example 7 In Comparative Example 7, the other raw materials for Agent 1 were prepared in the same way as in Example 1, but without the use of emulsifiers and cetearyl alcohol.

[0057] Comparative Example 8 In Comparative Example 8, the other raw materials of Agent 1 were prepared in the same way as in Example 1, except that 1 part of carbomer was used to replace the emulsifier and cetearyl alcohol was not added.

[0058] The amount of raw materials added and the preparation method of Agent 2 and Agent 3 in Comparative Examples 1-7 are the same as those in Example 1.

[0059] The raw materials and contents of hair dye compositions 1 in Comparative Examples 1-8 are shown in Table 2. Table 2. Raw materials and content of hair dyeing composition 1 in Comparative Examples 1-8

[0060] II. Hair dye agent 1 texture and hair dyeing effect test

[0061] The texture and appearance of the hair dye agent 1 prepared in Examples 1-4 and Comparative Examples 1-8 were evaluated. The evaluation results are shown in Table 1.

[0062] The hair dye products prepared from hair dyeing agents 1, 2, and 3 of Examples 1-4 and Comparative Examples 1-8 were tested for hair dyeing. 1g of natural white hair was cleaned and dried until it was no longer dripping wet. 1g of hair dyeing agent 1 was applied to the white hair and combed repeatedly to coat the white hair, leaving it for 30-50 minutes. Then, 0.5g of hair dyeing agent 2 and 0.5g of hair dyeing agent 3 were mixed in a container and applied to the white hair covered with agent 1, leaving it for 10-15 minutes, then rinsed clean. The hair dyeing effect was observed. The ratio of hair dyeing agent 1: hair dyeing agent 2: hair dyeing agent 3 was 2:1:1.

[0063] The dyeing effects of the hair dye products in Examples 1-4 are shown in the appendix. Figure 3 The coloring effects of hair dye products in comparison ratios 1-8 are shown in the appendix. Figure 4 .

[0064] The color and colorfastness of the hair dye products used in Examples 1-4 and Comparative Examples 1-8 were evaluated. 1) Wash the hair repeatedly with shampoo. Wash the dyed hair strands 10 times with shampoo and observe the changes in color fastness after dyeing.

[0065] 2) Sunlight simulator irradiation: The dyed hair strands were irradiated with a sunlight simulator for 36 hours, and the color fastness of the hair strands was observed. The results are recorded as shown in Table 3. The color fastness was scored from 1 to 10 points, with higher scores indicating higher color fastness.

[0066] Table 3. Color and color fastness after dyeing in the examples and comparative examples.

[0067] Depend on Figure 3 and Figure 4 As shown in Table 3: The hair dyeing products of Examples 1-4, obtained using anionic systems or a mixture of anionic and nonionic systems, have good dyeing effects. The hair color is natural black after dyeing, and the color fastness is good, remaining black even after color fastness testing.

[0068] Comparative Examples 1, 2, and 31 consisted of a nonionic emulsifier, a cationic emulsifier, and a nonionic emulsifier, respectively. After dyeing, they exhibited poor blackening effects, with the colors leaning towards brown and yellow.

[0069] Comparative Examples 4, 5, and 6 show that if too little potassium iodide or too much iodide is added to the first agent, the staining effect will be poor.

[0070] The formulation system of Agent 1 without emulsifier is in liquid form, such as Comparative Example 7, and is prone to dripping during the hair dyeing process.

[0071] The hair dye composition containing carbomer will exhibit precipitation, as seen in Comparative Example 8 where black precipitate forms, making it difficult to apply evenly and effectively coat the hair strands.

[0072] A hair strand test is conducted, where professionals score and evaluate the smoothness of dyed hair on a scale of 1 to 10, with higher scores indicating better hair smoothness. Skin irritation test: The hair dye was applied to the skin and left for 40 minutes. The skin was observed for redness to assess product safety. The assessment results are shown in Table 4.

[0073] Table 4. Hair dyeing and hair care effect tests of Examples 1-4 and Comparative Examples 1-8

[0074] As shown in Table 4, the hair was smoother after using the dyeing products of Examples 1-4, indicating that Examples 1-4 have a good hair care effect while having a dyeing effect, and the hair was smoother after use.

[0075] Compared to ratios 7-8, the product exhibits poorer smoothness and is less gentle during use.

[0076] The dry and wet combing properties of the dyed hair from Examples 1 and 8 were tested. The test results are shown in [Figure Number]. Figure 5 .

[0077] Depend on Figure 5 It can be seen that the dyeing product prepared in Example 1 has a better user experience, while the product in Comparative Example 8 has a poorer user experience and reduces the combability of the hair.

[0078] The materials of agent 1 in Examples 1-4 were stored at -20°C for one month to observe their stability at extremely low temperatures. The results showed that Examples 1 and 2 contained both anionic and nonionic emulsifiers, and had good low-temperature stability. However, Examples 3 and 4 only added one type of anionic emulsifier, and had relatively poor long-term stability at extremely low temperatures. In the case of polydihydroxyindole system, coarse water was produced at low temperatures.

[0079] The above description of the embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A hair dyeing composition, characterized in that, The hair dye composition comprises the following components by weight percentage: Emulsifier i: 0.1~13%, Polydihydroxyindole: 0.01%~10%, Ethanol or polyols: 0.01%~50%, Antioxidants: 0%~1%, Penetration enhancer: 0.1~2%, pH adjuster i: 0.001%~10%, Deionized water: Balance The emulsifier i comprises anionic emulsifier.

2. The hair dyeing composition according to claim 1, characterized in that, The anionic emulsifier is selected from one or more of alkyl taurate and alkyl glutamate emulsifiers, preferably one or more of sodium methylstearoyl taurate and / or sodium stearoyl glutamate, and the content of the anionic emulsifier ranges from 0.1% to 10%, preferably from 1% to 4.5%.

3. The hair dyeing composition according to claim 1, characterized in that, The emulsifier i further includes a nonionic emulsifier, which includes glycerides, preferably one or more of glyceryl stearate / PEG-100 glyceryl stearate and glyceryl stearate SE, and the content of the nonionic emulsifier ranges from 0 to 3%, preferably from 0.2 to 2%.

4. The hair dyeing composition according to claim 1, characterized in that, The polydihydroxyindole has a molecular weight of 300-800 and a content of 0.1%-3%, preferably 1.5-3.5%.

5. The hair dyeing composition according to claim 1, characterized in that, The mass ratio of the polydihydroxyindole to emulsifier i is 0.5~0.

8.

6. The hair dyeing composition according to claim 1, characterized in that, The polyol is selected from one or more of propylene glycol, dipropylene glycol, 1,3-butanediol, glycerol, diglycerol, and polyethylene glycol, and the content of the ethanol or polyol is 0.1% to 10%. The antioxidant is selected from one or more of ascorbic acid or its salt and sulfite. Preferably, the ascorbic acid or its salt is selected from ascorbic acid or sodium ascorbate, and the content is 0% to 1%, preferably 0.05% to 0.5%. The sulfite is selected from sodium sulfite, and its content is 0%~1%, preferably 0.05%~0.5%; The penetration enhancer is potassium iodide, with a content of 0.2-2%, and the mass ratio of polydihydroxyindole / potassium iodide is 3-5.

5. The pH adjuster i is selected from one or more of arginine, monoethanolamine, diethanolamine, triethanolamine, isopropanolamine, 2-amino-2-methylpropanol, 2-aminobutanol, sodium hydroxide, potassium hydroxide, and tetrahydroxypropylethylenediamine, with a content of 0.005%~3%; The hair dye composition further comprises fatty alcohol, which is selected from one or more of cetyl alcohol, stearyl alcohol, cetearyl alcohol, behenyl alcohol, and myristyl alcohol, and the content of the fatty alcohol is 1% to 15%, preferably 3% to 10%.

7. A method for preparing the hair dye composition as described in claims 1-6, characterized in that, The method includes the following steps: Add deionized water, emulsifier I, and fatty alcohol to the reaction vessel, heat to 80-85℃, and mix thoroughly. Cool down to below 45°C and add the antioxidant pre-dispersed in deionized water to the reaction vessel; Add the iodide dispersed in deionized water to the reaction vessel; Add pH adjuster i to the reaction vessel; The air in the reaction vessel is purged with nitrogen, and polyols and / or ethanol and polydihydroxyindole are added; the mixture is then filled to obtain the finished product.

8. A hair dyeing product, characterized in that, The hair dye product comprises agent 1, agent 2, and agent 3, characterized in that, The agent 1 comprises the hair dyeing composition as described in claims 1-6; The two agents, by mass percentage, contain the following components: emulsifier ii: 0.5%~10%, fatty alcohol: 1%~15%, peroxide: 1%~10%, pH adjuster ii: 0.01~1%, and solvent balance; The three agents, by mass percentage, contain the following components: emulsifier ii: 0.5~10%, fatty alcohol: 1%~15%, pH adjuster i: 0.1%~10%, and solvent balance; The mass ratio of agent 1: agent 2: agent 3 is 1.5~3:1:

1.

9. The hair dyeing product as described in claim 8, characterized in that, The pH value of the two agents is 3-4; The emulsifier ii is a mixture of fatty alcohol polyethers and glyceryl stearate SE, wherein the fatty alcohol polyether is preferably cetearyl alcohol polyether-25, and further, the content of cetearyl alcohol polyether-25 is preferably 2-4%, and the content of glyceryl stearate SE is preferably 0.5-1.5%. The fatty alcohol in agent 2 is cetearyl alcohol, with a content of 3% to 10%, preferably 3% to 5%; The peroxide is selected from one or more of hydrogen peroxide, sodium carbonate peroxide, sodium peroxide, and potassium peroxide. Preferably, the peroxide is hydrogen peroxide, and the content of hydrogen peroxide is preferably 1-4%. The pH adjuster ii is selected from one or more of lactic acid, citric acid, succinic acid, and malic acid; The second agent may further include a chelating agent selected from one or more of EDTA-2Na and hydroxyethyl diphosphate, with a content of 0.01-1%. The solvent for the two agents is deionized water or ethanol; The pH range of the three agents is 11-12; In the third agent, emulsifier ii is a mixture of fatty alcohol polyethers and glyceryl stearate SE, wherein the fatty alcohol polyether is preferably cetearyl alcohol polyether-25, and the content of cetearyl alcohol polyether-25 is 2~4%; the content of glyceryl stearate SE is 0.5~1.5%; The fatty alcohol in the three agents is cetearyl alcohol, with a content of 3% to 10%, preferably 3% to 5%; The content of the pH adjuster i is preferably 0.5% to 3%.

10. A method of using the hair dyeing product as described in claims 8-9, characterized in that, The method of use includes the following steps: At room temperature, apply hair dye agent 1 to clean gray hair and leave it for 30-50 minutes; then mix hair dye agent 2 and 3 and apply them to the gray hair covered by agent 1, leave it for 10-15 minutes; then wash it off. The mass ratio of hair dye agent 1: hair dye agent 2: hair dye agent 3 is 1.5-3:1:1.

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