Composite single-dosage type melanin precursor substance hair dye for nourishing and protecting hair

Abstract

The invention relates to the field of special cosmetics, and discloses a hair nourishing and protecting composite single-dosage type melanin precursor substance hair dye, a melanin precursor complexing agent in an agent A can promote melanin precursor substances to permeate into a hair layer in a high-activity manner and then be oxidized into melanin through the compounding effect of a polymer and ferulic acid polymeric particles, so that the hair can be nourished and protected, and the hair can be nourished and protected. The melanin absorption enhancer has the effects of dispersing melanin, promoting absorption of hair cuticles and enhancing melanin reaction polymerization, and the modified wool fat, the solution aid and the enzymolysis hydrolyzed keratin in the hair dyeing enhancer in the agent B have a synergistic effect; the hair dye prepared by the method can be used for promoting the formation of plant melanin precursor substances and the precipitation of small molecular plant pigments and active substances, can well permeate into hair to play a dyeing role, and further strengthens the dyeing effect under the combined action of the agent A, and the prepared hair dye is safe and non-irritant, has the effects of nourishing hair and caring hair, can realize rapid, uniform and effective blackening, and is high in color fastness to washing.

Description

Technical Field

[0001] The invention relates to the field of special cosmetics, and in particular to a composite single-dose melanin precursor hair dye for nourishing and protecting hair. Background Art

[0002] Hair dye can cover gray hair and give people a younger experience, but gray hair will not disappear completely after it grows out. Hair dye can only act on hair that has already grown and can be touched, so as the hair continues to grow, it needs to be continuously re-dyed; but according to the dyeing principle of hair dye, many hair dyes are not suitable for regular use. Frequent use in hair dyeing will damage the hair and scalp. For example, aniline chemical hair dyes, among which paraphenylenediamine is a carcinogen. Its working principle is to move into the hair keratin, and the active groups at both ends act with the hair protein through the amine group or the other end is connected with the coupling agent through an oxidant, so that the dyeing ingredients are attached to the hair for dyeing; for example, inorganic hair dyes react with silver nitrate solution and sodium sulfide to form silver sulfide, which is attached to the hair to achieve the dyeing effect; and plant-based hair dyes are naturally less irritating, but still contain phenol Hair dyes do not contain harmful ingredients such as hydroxyl radicals or hydrogen peroxide, or have disadvantages such as slow dyeing, poor dyeing effect and high cost. Currently, safer and more effective hair dyes are launched to darken hair by supplementing melanin precursors and then synthesizing melanin through the action of melanocytes in the body. Melanin precursors are low-toxic imitation melanin raw materials that can be absorbed into the cortex of the hair for oxidative polymerization into pigments, but hair dyeing is often required multiple times because the polymerization reaction is a slower process and melanin precursors are not stable and are easily oxidized and ineffective. The hair's absorption of precursors also needs to be further enhanced. Hair is located at the highest point of the human body and is more easily exposed to ultraviolet rays. Ultraviolet rays can cause damage to the hair, which is also the reason for the subsequent deterioration of the dyeing effect. Therefore, a hair dye that can improve the above problems has good market prospects. Summary of the invention

[0003] In view of the above problems, the object of the present invention is to provide a composite single-dose melanin precursor hair dye for hair care.

[0004] The technical contents of the present invention are as follows:

[0005] The invention provides a composite single-dose melanin precursor hair dye for nourishing and protecting hair, comprising the following components: a melanin precursor composite, a melanin synthesis accelerator, a hair dye enhancer, an auxiliary agent and water.

[0006] The hair dye comprises the following components in parts by weight: 18-22 parts of a melanin precursor complex, 4-6 parts of a melanin synthesis promoter, 9-11 parts of a hair dye enhancer, 11-15 parts of an auxiliary agent and 20-28 parts of water.

[0007] The preparation method of the melanin precursor composite comprises the following steps:

[0008] Step 1: histidine, sodium rosinate and alkyl glycoside in a mass ratio of 5-7:2-8:1-3 are subjected to pressure reaction for 40-60 minutes, a melanin precursor is added and stirred evenly, and a melanin precursor inclusion polymer is obtained after standing;

[0009] Step 2: Ferulic acid is treated with microwaves and then cooled, and the enzyme complex is added to PBS buffer at a mass fraction of 20-25% and 0.9-1.5%, and stirred and mixed to perform low-pressure polymerization. After the reaction, melanin precursor inclusion polymer is added at a mass ratio of 0.8-1.4:6-10, and stirred to obtain a melanin precursor complex;

[0010] The enzyme complex is obtained by adding 0.5-1 mg / L laccase and 0.5-1 mg / L oxidodismutase to a PBS solution;

[0011] The enzyme complex can promote the polymerization reaction of ferulic acid under low pressure conditions;

[0012] The melanin precursor is one or more of 5,6-dihydroxyindole and 5,6-dihydroxyindole-2-carboxylic acid;

[0013] The melanin precursor polymer in the melanin precursor composite is a positively charged polymer with a wrapping and protective effect, has affinity with hair keratin, can adhere to the hair to stretch the polymer, and release the melanin precursor substance. After the ferulic acid is dispersed, the polymer particles formed by the polymerization reaction under low pressure and enzyme action have strong antioxidant ability, so that the melanin precursor substance is not oxidized before entering the hair scales for reaction, and the stability is enhanced. Moreover, the melanin precursor substance has the ability to swell when in contact with air, which promotes the precursor substance to enter the hair to react and form melanin, and the dyeing effect is good.

[0014] The melanin synthesis promoter is an acid salt, oleyl alcohol, and a monohydric alcohol, and the weight ratio of the acid salt, oleyl alcohol, and the monohydric alcohol is 1-3:5-9:3;

[0015] The acid salt is one or more of zinc carbonate and copper gluconate;

[0016] The melanin precursor promoter is weakly alkaline and can promote the emulsification and polymerization of the melanin precursor complex. The monohydric alcohol therein has a dispersing effect, so that the melanin precursor complex acts evenly on the hair, and the short-chain aliphatic and oleyl alcohols synergistically promote the absorption of melanin precursor substances in the melanin precursor complex; copper gluconate is an oxygen-containing acid metal salt and has an oxidizing effect. It works together with zinc carbonate to increase the activity of tyrosinase and promote the oxidative polymerization reaction of melanin.

[0017] The preparation of the hair dye enhancer comprises the following steps:

[0018] Step 1: wash and crush the Chinese gallnut, Chinese arborvitae leaves and Ligustrum lucidum fruit, mix them in a mass ratio of 1:1:1-3, add water at a solid-liquid ratio of 1:10 g / mL, heat and extract for 1-3 hours, and obtain the plant extract after cooling;

[0019] Step 2: modifying the water-soluble lanolin to obtain modified lanolin;

[0020] Step 3: Mix the modified lanolin, hydrolyzed keratin, polyvinyl pyrrolidone and plant extract in a mass ratio of 3-5:1-1.5:1:14-19, perform high-pressure homogenization and emulsification, add 0.5-1 mg / L of protease for enzymatic hydrolysis, and obtain the hair dye enhancer after filtering with a macromolecular resin;

[0021] The modified lanolin is prepared by dissolving water-soluble lanolin in a low eutectic solution at a solid-liquid ratio of 1:2-3 g / mL, heating and dispersing by microwave for 20-30 minutes, adding NN dimethyl p-phenylenediamine dihydrochloride at a mass ratio of 1-3:0.3-0.6 to the water-soluble lanolin to react, and adjusting the pH to neutral; the low eutectic solution is obtained by mixing lactic acid with a mass fraction of 30-50% with water;

[0022] The modified lanolin is prepared by subjecting the unsaturated fatty acid carboxyl groups of the lanolin to an amination treatment through amides, introducing polar groups, and forming a certain cross-linking structure, so as to be a cationic semi-polymer;

[0023] The hair dye enhancer is prepared by water extraction of Chinese gallnut, Chinese cyperus rotundus leaves and Ligustrum lucidum to obtain natural plant pigments and other active effects, and the addition of semi-polymerized liposomes with amide bonds can have a specific adsorption effect on phenolic substances, can improve their biocompatibility and antioxidant properties, and can act on hair through electrostatic adsorption, so that the affinity for hair is high, and the color fastness of the hair dye can be enhanced and the damage to the hair caused by hair dyeing can be improved. The hydrolyzed keratin and the cosolvent are mixed and enzymatically hydrolyzed, and the disulfide bonds are broken under the process conditions of high-pressure homogenization to decompose cystine. The amino acids and solvents can promote the precipitation of plant polyphenols, and natural melanin intermediates are formed under the action of enzymes, which are not easily oxidized and can quickly penetrate into the hair layer for polymerization;

[0024] The auxiliary agent is one or more of sodium alginate, sodium ascorbate, allantoin, panthenol and polyethylene glycol.

[0025] The present invention also discloses a method for preparing a composite single-dose melanin precursor hair dye for hair care, comprising the following steps:

[0026] Step 1: premixing a melanin precursor complex and a melanin synthesis promoter and heating them to obtain agent A;

[0027] Step 2: After heating the water, mechanically stir it with the hair dye enhancer and auxiliary agent at a temperature of 60-70°C to obtain agent B.

[0028] Beneficial effects: The composite hair dye prepared by the present invention has no irritation reaction, little damage to hair, and can present a good hair dyeing effect. After dyeing, the hair is uniformly colored and has a healthy luster, and is suitable for damaged hair. Agent A contains a melanin precursor composite with a strong dyeing effect and a melanin synthesis promoter. The melanin precursor composite can promote the melanin precursor substance to penetrate into the hair layer with high activity and be oxidized into melanin through the composite action of polymer and ferulic acid polymer particles, and the melanin absorption promoter has the function of dispersing melanin, promoting hair scale absorption and enhancing melanin reaction polymerization through the composite action of monohydric alcohol, oleyl alcohol and acid salt. The utilization rate and reaction rate of melanin precursor substance are improved, the dyeing effect is fast, and at the same time, the hair scale is not damaged, the hair protein structure is kept tight, and the hair is stronger after dyeing.

[0029] Agent B contains hair dye enhancers and auxiliaries. The modified lanolin, solution auxiliaries and enzymatically hydrolyzed keratin in the hair dye enhancer work synergistically to promote the formation of plant melanin precursors and the precipitation of small molecule plant pigments and active substances. It can penetrate into the hair well to play a dyeing role and work together with Agent A to further enhance the dyeing effect. The liposomes and plant extracts in the hydrolyzed keratin and melanin precursor complex repair the hair scales during the dyeing process. The resulting hair dye has the effect of nourishing and protecting the hair. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a polyphenol content detection diagram of Example 1;

[0031] Figure 2 This is a diagram showing the hair tensile strength test of Examples 1-3. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below through specific implementation cases. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of protection of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art are all within the scope of the claims attached to this application.

[0033] Unless otherwise specified, all raw materials and reagents of the present invention are raw materials and reagents from the conventional market.

[0034] Example 1

[0035] A composite single-dose melanin precursor hair dye for hair care

[0036] Step 1: premix 20 parts of a melanin precursor composite and 5 parts of zinc carbonate, oleyl alcohol and methanol in a weight ratio of 2:7:3 and heat to obtain Agent A;

[0037] The preparation method of the melanin precursor complex is as follows: histidine, sodium rosinate and alkyl glycoside with a mass ratio of 6:5:2 are subjected to pressure reaction for 50 minutes, 5,6-dihydroxyindole is added and stirred evenly, and a melanin precursor inclusion polymer is obtained after standing; ferulic acid is subjected to microwave treatment for 10 minutes and then cooled, the microwave frequency is 300 MHz, and enzyme complexes are added to PBS buffer with a mass fraction of 22% and 1.2%, stirred and mixed evenly, and low-pressure polymerization is performed, the pressure is 3MPa, and the polymerization time is 40 minutes; after the reaction, the melanin precursor inclusion polymer is added with a mass ratio of 1.1:8 and stirred evenly to obtain the melanin precursor complex; the enzyme complex is obtained by adding 0.8 mg / L laccase and 0.8 mg / L oxidodismutase to PBS solution;

[0038] Step 2: 24 parts of water are heated to 40° C. and then mechanically stirred with 13 parts of sodium alginate, sodium ascorbate, allantoin, panthenol and polyethylene glycol in a mass ratio of 0.2:0.5:0.5:1:1 and 10 parts of hair dye enhancer at a temperature of 65° C. to obtain Agent B;

[0039] The preparation method of the hair dye enhancer is:

[0040] Step 1: wash and crush the Chinese gallnut, Chinese arborvitae leaves and Ligustrum lucidum fruit, mix them in a mass ratio of 1:1:1-3, add water at a solid-liquid ratio of 1:10 g / mL, heat and extract for 2 h, and obtain the plant extract after cooling;

[0041] Step 2: modifying water-soluble lanolin to obtain modified lanolin: dissolving water-soluble lanolin in a low eutectic solution at a solid-liquid ratio of 1:2 g / mL, heating and dispersing by microwave for 25 minutes, adding NN-dimethyl-p-phenylenediamine dihydrochloride at a mass ratio of 2:0.5 to water-soluble lanolin to react, and adjusting the pH to neutral to obtain the modified lanolin; the low eutectic solution is obtained by mixing 40% by mass lactic acid with water;

[0042] Step 3: The modified lanolin, hydrolyzed keratin, polyvinyl pyrrolidone and plant extract are mixed in a mass ratio of 4:1:1:16 and then emulsified by high-pressure homogenization. 0.8 mg / L of protease is added for enzymatic hydrolysis. The hair dye enhancer is obtained after filtering with a macromolecular resin.

[0043] Example 2

[0044] A composite single-dose melanin precursor hair dye for hair care

[0045] Step 1: premix 18 parts of a melanin precursor composite agent and 4 parts of zinc carbonate, oleyl alcohol and methanol in a weight ratio of 1:5:3 and heat to obtain agent A;

[0046] The preparation method of the melanin precursor complex is as follows: histidine, sodium rosinate and alkyl glycoside with a mass ratio of 5:2:1 are subjected to pressure reaction for 40 minutes, 5,6-dihydroxyindole-2-carboxylic acid is added and stirred evenly, and a melanin precursor inclusion polymer is obtained after standing; ferulic acid is subjected to microwave treatment for 10 minutes and then cooled, the microwave frequency is 300 MHz, and the enzyme complex is added to a PBS buffer solution with a mass fraction of 20% and 0.9%, stirred and mixed evenly, and low-pressure polymerization is performed, the pressure is 3MPa, and the polymerization time is 40 minutes; after the reaction, the melanin precursor inclusion polymer is added with a mass ratio of 0.8:6 and stirred evenly to obtain the melanin precursor complex; the enzyme complex is obtained by adding 0.5 mg / L laccase and 0.5 mg / L oxidodismutase to a PBS solution;

[0047] Step 2: 20 parts of water are heated to 40° C. and then mechanically stirred with 11 parts of sodium alginate, sodium ascorbate, allantoin, panthenol and polyethylene glycol in a mass ratio of 0.2:0.5:0.5:1:1 and 9 parts of hair dye enhancer at a temperature of 60° C. to obtain Agent B;

[0048] The preparation of the hair dye enhancer comprises the following steps:

[0049] Step 1: wash and crush the Chinese gallnut, Chinese arborvitae leaves and Ligustrum lucidum fruit, mix them in a mass ratio of 1:1:1-3, add water at a solid-liquid ratio of 1:10 g / mL, heat and extract for 1 h, and obtain the plant extract after cooling;

[0050] Step 2: modifying water-soluble lanolin to obtain modified lanolin: dissolving water-soluble lanolin in a low eutectic solution at a solid-liquid ratio of 1:2 g / mL, heating and dispersing by microwave for 20 minutes, adding NN-dimethyl-p-phenylenediamine dihydrochloride at a mass ratio of 1:0.3 to water-soluble lanolin to react, and adjusting the pH to neutral to obtain the modified lanolin; the low eutectic solution is obtained by mixing 30% by mass of lactic acid with water;

[0051] Step 3: The modified lanolin, hydrolyzed keratin, polyvinyl pyrrolidone and plant extract are mixed in a mass ratio of 5:1:1:19 and then high-pressure homogenized and emulsified, 0.5 mg / L of protease is added for enzymatic hydrolysis, and the hair dye enhancer is obtained after filtering with a macromolecular resin.

[0052] Example 3

[0053] A composite single-dose melanin precursor hair dye for hair care

[0054] Step 1: premix 22 parts of a melanin precursor complex and 6 parts of copper gluconate, oleyl alcohol and methanol in a weight ratio of 3:9:3 and heat to obtain Agent A;

[0055] The preparation method of the melanin precursor complex is as follows: histidine, sodium rosinate and alkyl glycoside with a mass ratio of 7:8:3 are subjected to pressure reaction for 60 minutes, 5,6-dihydroxyindole-2-carboxylic acid is added and stirred evenly, and a melanin precursor inclusion polymer is obtained after standing; ferulic acid is subjected to microwave treatment for 10 minutes and then cooled, the microwave frequency is 300 MHz, and the enzyme complex is added to a PBS buffer solution with a mass fraction of 25% and 1.5%, stirred and mixed evenly, and low-pressure polymerization is performed, the pressure is 3MPa, and the polymerization time is 40 minutes; after the reaction, the melanin precursor inclusion polymer is added with a mass ratio of 1.4:10 and stirred evenly to obtain the melanin precursor complex; the enzyme complex is obtained by adding 1 mg / L laccase and 1 mg / L oxidodismutase to a PBS solution;

[0056] Step 2: 28 parts of water are heated to 40° C. and then mechanically stirred with 15 parts of sodium alginate, sodium ascorbate, allantoin, panthenol and polyethylene glycol in a mass ratio of 0.2:0.5:0.5:1:1 and 11 parts of hair dye enhancer at a temperature of 70° C. to obtain Agent B;

[0057] The preparation of the hair dye enhancer comprises the following steps:

[0058] Step 1: wash and crush the Chinese gallnut, Chinese arborvitae leaves and Ligustrum lucidum fruit, mix them in a mass ratio of 1:1:1-3, add water at a solid-liquid ratio of 1:10 g / mL, heat and extract for 3 hours, and obtain the plant extract after cooling;

[0059] Step 2: modifying water-soluble lanolin to obtain modified lanolin: dissolving water-soluble lanolin in a low eutectic solution at a solid-liquid ratio of 1:3 g / mL, heating and dispersing by microwave for 30 minutes, adding NN-dimethyl-p-phenylenediamine dihydrochloride at a mass ratio of 3:0.6 to water-soluble lanolin to react, and adjusting the pH to neutral to obtain the modified lanolin; the low eutectic solution is obtained by mixing 50% by mass lactic acid with water;

[0060] Step 3: The modified lanolin, hydrolyzed keratin, polyvinyl pyrrolidone and plant extract are mixed in a mass ratio of 5:1.5:1:19 and then emulsified by high-pressure homogenization, 1 mg / L of protease is added for enzymatic hydrolysis, and the hair dye enhancer is obtained after filtering with a macromolecular resin.

[0061] Comparative Example 1

[0062] The difference between Comparative Example 1 and Example 1 is that, in the preparation process of the melanin precursor composite added in Comparative Example 1, step 2 is not performed, and only the melanin precursor inclusion polymer is prepared according to step 1, and other conditions remain unchanged.

[0063] Comparative Example 2

[0064] The difference between Comparative Example 2 and Example 1 is that the preparation method of the melanin precursor complex added in Comparative Example 2 is to microwave-treat ferulic acid and then cool it, add it and the enzyme complex at a mass fraction of 22% and 1.2% to PBS buffer, stir and mix, and perform low-pressure polymerization, and after the reaction, add 5,6-dihydroxyindole at a mass ratio of 1.1:8 and stir homogenously to obtain a melanin precursor complex; the enzyme complex is obtained by adding 0.8 mg / L laccase and 0.8 mg / L oxidodismutase to PBS solution; other conditions remain unchanged.

[0065] Comparative Example 3

[0066] The difference between Comparative Example 3 and Example 1 is that the preparation method of the hair dye enhancer of Comparative Example 3 is different. The mixture extracted in step 1 is mixed with equal amounts of water-soluble lanolin, hydrolyzed keratin and polyvinyl pyrrolidone and then filtered with a macromolecular resin, and other conditions remain unchanged.

[0067] 1. The melanin precursor composites prepared in Example 1 and Comparative Examples 1-2 were placed in air for 72 hours, and the absorbance at 300 nm and 475 nm before and after the placement was measured using an ultraviolet spectrophotometer. The test results are shown in Table 1.

[0068] Table 1 Absorbance of melanin precursor substances

[0069]

[0070] It can be seen from Table 1 that the melanin precursor material in the melanin precursor composite prepared by the present invention can maintain good stability and is not easily oxidized into melanin in advance.

[0071] Second, the method of Example 1 was used to prepare 200 g of the water extract mixture and the hair dye enhancer, and the polyphenol concentration under equal volume conditions was detected by the Folin-Ciocalteu method. The detection time was 0 h, 100 h, and 200 h after preparation. The detection results were as follows: Figure 1 As shown by Figure 1 It can be seen that the present invention extracts gallnut, arborvitae leaves and Ligustrum lucidum with water, and then promotes the dissolution of polyphenols by adsorption through modified lanolin, hydrolyzed keratin and polyvinyl pyrrolidone, which can significantly improve the content and stability of polyphenols compared with simple water extraction.

[0072] 3. The same white hair was dyed according to the normal hair dyeing steps of the embodiment and the comparative example. Specifically, when the hair was dry, the A and B agents in the hair dye were mixed and evenly applied to the hair, and the hair was washed with water and dried. The chromaticity of the dyed hair was tested. The test results are shown in Table 1. Taking the hair before dyeing as the standard, the calculation formula is: △E*=[(△L*)2+(△a*)2. +(△b*)2]1 / 2;

[0073] ΔL = L* sample - L* standard (lightness difference); Δa = a* sample - a* standard (red / green difference); Δb = b* sample - b standard (yellow / blue difference).

[0074] Table 2 Hair chromaticity table

[0075]

[0076] As can be seen from Table 2, the hair dye prepared by the present invention can well penetrate the melanin precursor into the hair to synthesize melanin. The chromaticity difference before and after dyeing is large, and the color is darker than that of the comparative example.

[0077] 4. The hair dyes prepared in the embodiments and comparative examples were tested for wash fastness. The dyed hair was soaked in commercially available shampoo and water for 30 days and irradiated with ultraviolet light. The hair was then washed and dried 30 times with shampoo. The hair after soaking and washing was evaluated. The evaluation standard was the hair before soaking, and the scores were 1-10. The evaluation results are shown in Table 3.

[0078] Table 3 Washability Evaluation Table

[0079]

[0080]

[0081] As shown in Table 3, the hair dye prepared by the present invention has a long-lasting dyeing effect, has strong color fastness in the simulated shampooing test, and is not easy to fade.

[0082] 5. Hair damage test

[0083] The tensile strength test was performed on the hair of Example 1-3 of Test 3 and before hair dyeing. The test results are as follows: Figure 2 As shown, it can be known that the hair dye prepared by the present invention does not damage the hair scales, can strengthen the hair, and the tensile strength of the hair after dyeing is increased.

[0084] In summary, the composite single-dose hair dye prepared by the present invention works together with agent A and agent B during hair dyeing. Agent A forms a positively charged polymer with affinity for hair by reacting with melanin precursors, and then mixes with ferulic acid polymer particles that have antioxidant and ultraviolet absorption properties, thereby maintaining the stability of the melanin precursors. The compound is mixed with a melanin synthesis promoter, thereby fully exerting the dyeing efficacy of the melanin precursors, resisting damage from shampoo and ultraviolet rays, and achieving a long-lasting hair dyeing effect. Meanwhile, the dyeing enhancer in agent B further enhances the dyeing effect and hair care, resulting in a good hair dyeing effect and high washing color fastness. The addition of liposomes and hydrolyzed keratin and other substances has the effect of repairing hair damage and protecting hair, and the hair becomes strong and tough after washing.

[0085] The composite single-agent hair dye of the present invention can be applied to hair of different shades. For darker hair such as brown, agent A alone can be used to dye the hair black. For lighter hair or those who seek a faster dyeing effect, agent A and agent B can be mixed and used for a better effect.

Claims

1. A composite single-dose melanin precursor hair dye for hair care, characterized in that: Contains the following ingredients: melanin precursor complex, melanin synthesis accelerator, hair dye enhancer, auxiliary agent and water.

2. The composite single-dose melanin precursor hair dye for hair care according to claim 1, characterized in that: The hair dye comprises the following components in parts by weight: 18-22 parts of a melanin precursor complex, 4-6 parts of a melanin synthesis promoter, 9-11 parts of a hair dye enhancer, 11-15 parts of an auxiliary agent and 20-28 parts of water.

3. The composite single-dose melanin precursor hair dye for hair care according to claim 1, characterized in that: The preparation method of the melanin precursor composite comprises the following steps: Step 1: histidine, sodium rosinate and alkyl glycoside in a mass ratio of 5-7:2-8:1-3 are subjected to pressure reaction for 40-60 minutes, a melanin precursor is added and stirred evenly, and a melanin precursor inclusion polymer is obtained after standing; Step 2: Ferulic acid is treated with microwaves and then cooled, and the enzyme complex is added to PBS buffer at a mass fraction of 20-25% and 0.9-1.5%, stirred and mixed to perform low-pressure polymerization, and after the reaction, melanin precursor inclusion polymer is added at a mass ratio of 0.8-1.4:6-10 and stirred to obtain a melanin precursor complex.

4. The composite single-dose melanin precursor hair dye for hair care according to claim 3, characterized in that: The enzyme complex is obtained by adding 0.5-1 mg / L laccase and 0.5-1 mg / L oxidodismutase into PBS solution and mixing.

5. The composite single-dose melanin precursor hair dye for hair care according to claim 3, characterized in that: The melanin precursor is one or more of 5,6-dihydroxyindole and 5,6-dihydroxyindole-2-carboxylic acid.

6. The composite single-dose melanin precursor hair dye for hair care according to claim 1, characterized in that: The melanin synthesis promoter is composed of an acid salt, oleyl alcohol, and a monohydric alcohol, wherein the weight ratio of the acid salt, oleyl alcohol, and the monohydric alcohol is 1-3:5-9:3; The acid salt is one or more of zinc carbonate and copper gluconate.

7. The composite single-dose melanin precursor hair dye for hair care according to claim 1, characterized in that: The preparation of the hair dye enhancer comprises the following steps: Step 1: wash and crush the Chinese gallnut, Chinese arborvitae leaves and Ligustrum lucidum fruit, mix them in a mass ratio of 1:1:1-3, add water at a solid-liquid ratio of 1:10 g / mL, heat and extract for 1-3 hours, and obtain the plant extract after cooling; Step 2: modifying the water-soluble lanolin to obtain modified lanolin; Step 3: Mix the modified lanolin, hydrolyzed keratin, polyvinyl pyrrolidone and plant extract in a mass ratio of 3-5:1-1.5:1:14-19 and perform high-pressure homogenization and emulsification, add 0.5-1 mg / L of protease for enzymatic hydrolysis, and obtain the hair dye enhancer after filtering with a macromolecular resin.

8. The composite single-dose melanin precursor hair dye for hair care according to claim 7, characterized in that: The modified lanolin is prepared by dissolving water-soluble lanolin in a low eutectic solution at a solid-liquid ratio of 1:2-3 g / mL, heating and dispersing by microwave for 20-30 minutes, adding NN-dimethyl-p-phenylenediamine dihydrochloride at a mass ratio of 1-3:0.3-0.6 to the water-soluble lanolin, and adjusting the pH to neutral to obtain the modified lanolin. The eutectic solution is obtained by mixing 30-50% by mass of lactic acid with water.

9. The composite single-dose melanin precursor hair dye for hair care according to claim 1, characterized in that: The auxiliary agent is one or more of sodium alginate, sodium ascorbate, allantoin, panthenol and polyethylene glycol.

10. A method for preparing a composite single-dose melanin precursor hair dye for hair care according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: premixing a melanin precursor complex and a melanin synthesis promoter and heating them to obtain agent A; Step 2: After heating the water, mechanically stir it with the hair dye enhancer and auxiliary agent at a temperature of 60-70°C to obtain agent B.

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