Mild acidic hair dyeing composition based on indole and plant extract and preparation method of mild acidic hair dyeing composition

Abstract

The invention discloses a mild acidic hair dyeing composition based on indole and plant extracts and a preparation method thereof, and belongs to the technical field of daily chemicals, and the mild acidic hair dyeing composition based on indole and plant extracts is characterized by comprising a dye penetrant and an oxidation color fixing agent which are used separately, the dye penetrant comprises an effective coloring amount of 5, 6-dihydroxyindole or an oligomer thereof, an eclipta prostrata extract and a black sesame extract; the oxidation color fixing agent comprises 0.5-3.0 wt% of hydrogen peroxide, and the hair dye with low damage and high safety is realized through the steps of separating dye penetration and oxidation color fixing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of daily chemicals, in particular to a mild acidic hair dyeing composition based on indole and plant extracts and a preparation method thereof. BACKGROUND

[0002] Current mainstream oxidative hair dyes rely on small molecule aromatic amine compounds such as p-phenylenediamine (PPD) and resorcinol. P-phenylenediamine is a strong sensitizer, and its oxidation intermediate "Bandrowski's base" can cause severe contact dermatitis. Resorcinol has skin irritation and endocrine disrupting potential. In addition, to achieve rapid color development, traditional formulations often use high concentrations (6-12%) of hydrogen peroxide and alkali (such as ammonia), which not only exacerbates scalp irritation, but also irreversibly oxidizes and damages the disulfide bonds in hair keratin, resulting in damaged, dry and brittle hair.

[0003] With the increasing demand of consumers for healthy and safe hair dyeing, there is an urgent need in the market for an innovative hair dyeing system that can provide dyeing effects and efficiency comparable to traditional products, while having high safety and hair care performance. SUMMARY

[0004] To solve the problems in the prior art, the present application provides a mild acidic hair dyeing composition based on indole and plant extracts and a preparation method thereof, which realizes a low-damage and high-safety hair dyeing agent by separating the coloring penetration and oxidation fixation steps.

[0005] The first aspect of the present application is to provide a mild acidic hair dyeing composition based on indole and plant extracts. Indole is the precursor of natural melanin in hair, and the following technical solution is adopted: A mild acidic hair dyeing composition based on indole and plant extracts, the composition includes a coloring penetrant and an oxidation fixative used separately, the coloring penetrant includes an effective coloring amount of 5,6-dihydroxyindole or its oligomer, ophiopogon japonicus extract and black sesame extract; the oxidation fixative includes 0.5-3.0wt% of hydrogen peroxide.

[0006] In a preferred embodiment, the content of 5,6-dihydroxyindole or its oligomer in the coloring penetrant is 0.5-2wt%, the content of ophiopogon japonicus extract is 0.05-5.0wt%, and the content of black sesame extract is 0.05-5.0wt%.

[0007] In a preferred embodiment, the oligomer is polydihydroxyindole with a degree of polymerization of 2-3.

[0008] By adopting the above technical solution, the color penetrant and oxidative fixing agent are used separately in this application. First, the color penetrant is applied to the hair and kept heated for at least 30 minutes. During this process, the acidic color penetrant gently promotes the swelling of hair keratin, causing the hair cuticles to relax moderately. This greatly promotes the penetration of 5,6-dihydroxyindole or its oligomers, eclipta prostrata extract, and black sesame extract into the hair cortex. Sufficient penetration time ensures that the melanin precursor has enough opportunity to distribute evenly and achieve the ideal coloring depth. During this process, the phenols, quinones, and other substances contained in the eclipta prostrata extract and black sesame extract can adhere to the color and, together with 5,6-dihydroxyindole or its oligomers, eclipta prostrata extract, and black sesame extract, achieve the desired coloring depth. 6-Dihydroxyindole or its oligomers together create richer hues and can assist 5,6-dihydroxyindole in more complete and uniform polymerization, resulting in more even and resistant hair color after dyeing. In addition, the nutrients contained in these substances can remove some of the free radicals generated by oxidative stress during the hair dyeing process, providing some protection for the hair. Moreover, the oils, vitamins, and sesamin in black sesame extract have better moisturizing and antioxidant capabilities, which can form a very thin protective film on the hair surface during the dyeing process, reducing the loss of internal moisture and neutralizing some oxidative damage, making the dyed hair shiny.

[0009] After the color penetrant has penetrated for more than 30 minutes, it is washed off and then an oxidative color-fixing agent is applied and left for more than 8 minutes. By separating the penetration and oxidative color-fixing processes, this application not only allows the melanin precursor to fully penetrate without a violent oxidation reaction, but also allows for gentle oxidative color-fixing using a low concentration (≤3wt%) of hydrogen peroxide. This allows the oxidative polymerization process of 5,6-dihydroxyindole or its oligomers to occur inside the hair, and the resulting dark, insoluble melanin macromolecules are "locked" inside the hair, resulting in better color durability. At the same time, the oxidant only comes into short contact with the hair in the second stage and at a very low concentration, so it hardly involves bleaching the hair's own pigment or oxidative damage to keratin, thereby minimizing hair damage.

[0010] In a preferred embodiment, the pH of the color penetrant system is 3.5-6.0, and the pH of the oxidative fixing agent system is 3.0-4.0.

[0011] In addition, polydihydroxyindole, as an oligomer of 5,6-dihydroxyindole, can complete the self-assembly of nanostructures more efficiently, and the surface roughness of dyed hair is significantly reduced. This is because hair keratin is rich in polar functional groups such as carboxyl, amino and hydroxyl groups. During the oxidative polymerization of polydihydroxyindole, it binds tightly to the hair through covalent / non-covalent interactions such as Michael addition, Schiff base reaction and π-π stacking to form a uniform coating. After 30 washes, the dyed hair still maintains a low surface roughness.

[0012] By adopting the technical scheme, when the pH of the coloring penetrant is in the range of 4-6, the stability of 5,6-dihydroxyindole or its oligomers in the dyeing process can be ensured, and the dyeing agent can be ensured to penetrate into the cortex of the hair completely and deeply. When the pH of the oxidizing fixing agent is in the range of 3-4, the oxidization polymerization process becomes slow and controllable, and the acidic environment helps the hair cuticle to tighten, and the pigment macromolecules are better locked inside the hair fibers, thereby improving the color persistence.

[0013] In a preferred embodiment, the composition is in a paste or emulsion form, and the emulsion form is used for daily contactless hair dyeing, wherein the oxidizing fixing agent in the emulsion form can be in one of a shampoo form and a hair conditioner form.

[0014] In a preferred embodiment, the paste form coloring penetrant comprises, by weight percentage, 5,6-dihydroxyindole or its oligomers 0.5-2%, extract of polygonum multiflorum 0.05-5.0%, extract of black sesame 0.05-5.0%, cetearyl alcohol 10-14%, glyceryl stearate 2-4%, sodium laureth sulfate 6-10%, cocamidopropyl betaine 1-5%, propylene glycol 3-6%, a pH adjuster, and the balance of water. The oxidizing fixing agent comprises, by weight percentage, disodium ethylenediaminetetraacetate 0.1-0.2%, acrylates / C10-30 alkyl acrylate crosspolymer 0.5-1.0%, hydrogen peroxide 0.5-3.0%, glycerin 2-4%, cetearyl alcohol 4-6%, a pH adjuster, and the balance of water.

[0015] In a preferred embodiment, the emulsion form coloring penetrant comprises, by weight percentage, 5,6-dihydroxyindole or its oligomers 0.5-2%, extract of polygonum multiflorum 0.05-5.0%, extract of black sesame 0.05-5.0%, dimethicone 2-3%, polyquaternium 1.5-2%, ethanol 10-15%, a preservative 0.4-0.5%, an acrylic copolymer 1.0-1.5%, a pH adjuster, and the balance of water. The oxidizing fixing agent comprises, by weight percentage, sodium laureth sulfate 10-12%, cocamidopropyl betaine 3.5-5.5%, hydrogen peroxide 0.5-3.0%, disodium ethylenediaminetetraacetate 0.1-0.2%, a viscosity adjuster 1.0-1.5%, a pH adjuster, and the balance of water.

[0016] The second aspect of the present application is to provide a preparation method of a mild acid hair dyeing composition based on indole and plant extracts, and the preparation of the paste form coloring penetrant comprises the following steps: S1, heating and dissolving cetearyl alcohol and glyceryl stearate; S2, stir and heat lauryl polyether sulfate sodium, cocamidopropyl betaine, propylene glycol; S3, add step S2 to step S1 under stirring and mix; S4, after cooling to below 45℃, add 5,6-dihydroxyindole or its oligomer, extract of aconite and black sesame extract and stir evenly; S5, adjust the pH of the system with aqueous citric acid solution; S6, cool and discharge; The preparation of the paste-like oxidative fixing agent comprises the following steps: S1, dissolve disodium ethylenediaminetetraacetate in water, then add acrylic acid / C10-30 alkyl acrylate cross-linked polymer and disperse evenly; S2, add hydrogen peroxide under stirring; S3, heat and dissolve glycerol and cetylstearyl alcohol, then add to step S2; S4, adjust the pH of the paste with a pH adjuster, then cool and discharge.

[0017] The second aspect of the present application is to provide a preparation method of a mild acidic hair dyeing composition based on indole and plant extracts, and the preparation of the emulsion-like coloring penetrant comprises the following steps: S1, mix water, polyquaternary ammonium salt and citric acid under stirring until dissolved; S2, add extract of aconite and black sesame extract to step S1 and stir evenly; S3, dissolve 5,6-dihydroxyindole or its oligomer in ethanol, then add polydimethylsiloxane, acrylic copolymer and preservative and mix evenly; S4, add the mixture obtained in step S3 to step S2 under stirring to form an emulsion; The preparation of the emulsion-like oxidative fixing agent comprises the following steps: S1, dissolve disodium ethylenediaminetetraacetate, lauryl polyether sulfate sodium and cocamidopropyl betaine in water under stirring; S2, adjust the pH of the system with a pH adjuster; S3, add hydrogen peroxide under stirring, then add a viscosity adjuster and stir evenly.

[0018] In summary, the present application has the following beneficial effects: 1. Ultra-low damage, the two-stage dyeing process of the present application and the cooperation of low-concentration hydrogen peroxide make the hair healthy after dyeing, greatly reducing the problem of dry hair caused by traditional hair dyeing.

[0019] 2. Safe process, the coloring penetrant and the oxidative fixing agent of the hair dyeing composition of the present application are used in steps, avoiding the irritation that may be caused by the reaction of the oxidizing agent and the melanin precursor on the scalp.

[0020] 3. The effect is long-lasting, indole or its oligomers are polymerized inside the hair, and the color fastness is far superior to that of physical adhesion type plant hair dyeing.

[0021] 4. The scalp is friendly, the time of the hair contacting the oxidizing agent is short, the concentration is low, and the experience is more comfortable during the whole process. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a three-coloring effect picture of the hair dyeing composition of Example 1 of the present application.

[0023] Figure 2 is a real person test picture of the hair dyeing composition of Example 1 of the present application.

[0024] Figure 3 is a real person test picture of the hair dyeing composition of Example 1 of the present application.

[0025] Figure 4 is a real person test effect picture of one-coloring of the hair dyeing composition of Example 2 of the present application.

[0026] Figure 5 is a real person test effect picture of one-coloring of the hair dyeing composition of Example 2 of the present application.

[0027] Figure 6 is a color loss experiment test effect picture of the hair dyeing composition of Example 2 of the present application. DETAILED DESCRIPTION

[0028] The present application will be further described in detail below with reference to the accompanying drawings. All reagents not specified by the manufacturer are conventional reagent products that can be obtained by purchase on the market.

[0029] The target color of the hair dyeing composition of the present application is natural black.

[0030] The CAS number of polydihydroxyindole in the example of the present application is 8049-97-6, and the degree of polymerization is 2-3.

[0031] Example 1

[0032] A mild acidic paste hair dyeing composition based on indole and plant extracts, comprising a paste color penetrating agent and a paste oxidizing fixing agent, the color penetrating agent comprises, by weight percentage: polydihydroxyindole 0.5%, Chinese pondweed extract 0.05%, black sesame extract 0.05%, cetearyl alcohol 12%, glyceryl stearate 3%, sodium laureth sulfate 8%, cocamidopropyl betaine 3%, propylene glycol 5%, a pH adjuster, and the balance of water, the pH adjuster is an aqueous citric acid solution, which adjusts the pH of the color penetrating agent to 3.5; The oxidative fixing agent comprises, by weight percentage, disodium ethylenediaminetetraacetate 0.1%, acrylic acid / C10-30 alkyl acrylate cross-linked polymer 0.8%, glycerol 3.0%, cetyl stearyl alcohol 5.0%, pH adjuster, and the balance water, the pH adjuster consisting of phosphoric acid and sodium hydroxide, and the system pH is adjusted to 3.0; The preparation of the paste-like coloring penetrant comprises the following steps: S1, heating and dissolving cetyl stearyl alcohol and glyceryl stearate; S2, stirring and heating lauryl polyoxyethylene sulfate sodium, cocamidopropyl betaine, and propylene glycol to the same temperature; S3, adding step S2 to step S1 under stirring and mixing; S4, after cooling to below 45℃, adding 5,6-dihydroxyindole or its oligomer, extract of polygonum multiflorum, and black sesame extract, and stirring uniformly; S5, adjusting the system pH with aqueous citric acid solution; S6, cooling and discharging; The preparation of the paste-like oxidative fixing agent comprises the following steps: S1, dissolving disodium ethylenediaminetetraacetate in water, and then adding acrylic acid / C10-30 alkyl acrylate cross-linked polymer and dispersing uniformly; S2, adding hydrogen peroxide under stirring; S3, heating and dissolving glycerol and cetyl stearyl alcohol, and then adding to step S2; S4, adjusting the paste pH with a pH adjuster, and then cooling and discharging.

[0033] In use, the coloring penetrant is first applied to the hair, and left to stand at a temperature of 45℃ for 40-50 min, and then washed off, and then the coloring fixing agent is applied to the hair, and left to stand for 8-15 min, and then the hair is thoroughly washed.

[0034] Example 2

[0035] A mild acidic paste-like hair dyeing composition based on indole and plant extracts, which differs from example 1 in that the coloring penetrant comprises 5,6-dihydroxyindole 2%, extract of polygonum multiflorum 3.0%, black sesame extract 3.0%, cetyl stearyl alcohol 10%, glyceryl stearate 2%, lauryl polyoxyethylene sulfate sodium 6%, cocamidopropyl betaine 1%, propylene glycol 3%, pH adjuster, and the balance water, and the system pH is 5.0; the oxidative fixing agent comprises disodium ethylenediaminetetraacetate 0.2%, acrylic acid / C10-30 alkyl acrylate cross-linked polymer 0.5%, hydrogen peroxide 3.0%, glycerol 2%, cetyl stearyl alcohol 4%, pH adjuster, and the balance water, and the system pH is 4.0, and the others are the same as in example 1.

[0036] Example 3

[0037] A mild acidic cream hair dyeing composition based on indole and plant extracts, different from example 1 in that the 5,6-dihydroxyindole in the color penetrating agent is 2%, the extract of polygonum multiflorum thunb is 5.0%, the extract of semen sesamum is 5.0%, cetearyl alcohol is 14%, glyceryl stearate is 4%, sodium laureth sulfate is 10%, cocamidopropyl betaine is 5%, propylene glycol is 6%, pH adjuster and the balance of water, the pH of the system is 6.0; the ethylenediaminetetraacetic acid disodium in the oxidative fixing agent is 0.2%, the acrylate / C10-30 alkyl acrylate crosspolymer is 1.0%, hydrogen peroxide is 3.0%, glycerin is 4%, cetearyl alcohol is 6%, pH adjuster and the balance of water, the pH of the system is 3.5, and the others are the same as example 1.

[0038] Example 4-5 is an emulsion hair dyeing composition, which is a daily invisible hair dyeing composition. The color penetrating agent is equivalent to an invisible hair conditioner, which is used on the white hair area in the morning every day, and the oxidative fixing agent is equivalent to an oxidative shampoo, which is used when washing the hair after one day. The color penetrating agent and the oxidative fixing agent are used alternately in the morning and evening for 5 days, and then long-lasting dyeing can be achieved.

[0039] Example 4

[0040] A mild acidic emulsion hair dyeing composition based on indole and plant extracts, the color penetrating agent includes, by weight percentage: 5,6-dihydroxyindole 0.8%, extract of polygonum multiflorum thunb 3.0%, extract of semen sesamum 3.0%, dimethicone 2.0%, polyquaternary ammonium salt 1.5%, ethanol 15%, preservative 0.5%, acrylic copolymer 1.0%, fragrance 0.2%, pH adjuster and the balance of water, the pH adjuster is citric acid to adjust the pH to 5.5; The oxidative fixing agent includes, by weight percentage: sodium laureth sulfate 10%, cocamidopropyl betaine 3.5%, hydrogen peroxide 3.0%, ethylenediaminetetraacetic acid disodium 0.1%, viscosity regulator 1.0%, fragrance 0.3%, pH adjuster and the balance of water, the pH adjuster is citric acid to adjust the pH to 3.5; The preparation of the emulsion color penetrating agent includes the following steps: S1, mix water, polyquaternary ammonium salt and citric acid and stir until dissolved; S2, add the extract of polygonum multiflorum thunb and the extract of semen sesamum to step S1 and stir evenly; S3, dissolve 5,6-dihydroxyindole or its oligomer in ethanol, and then add dimethicone, acrylic copolymer and preservative and mix evenly; S4, under stirring, add the mixture obtained in step S3 to step S2 to form an emulsion; The preparation of the emulsion oxidative fixing agent includes the following steps: S1, Dissolve disodium ethylenediaminetetraacetate, sodium laureth sulfate, cocamidopropyl betaine in water under stirring; S2, Adjust the pH of the system with a pH adjuster; S3, Add hydrogen peroxide under stirring, then add viscosity regulator and stir until uniform.

[0041] In use, it is used for temporary white hair covering in daily commuting. Specifically, on Monday, apply the coloring penetrant to the area where white hair is concentrated, and comb it. After drying, wash the hair with the oxidizing fixative in the form of shampoo at night. Continue to use until Friday, and the white hair will turn into natural dark brown, realizing a smooth transition from temporary covering to permanent coloring.

[0042] Example 5

[0043] A mild acidic emulsion-like hair dyeing composition based on indole and plant extracts, which is different from Example 4 in that 5,6-dihydroxyindole or its oligomer is 2%, ophiopogon japonicus extract is 5.0%, black sesame extract is 5.0%, dimethicone is 3%, polyquaternary ammonium salt is 2%, ethanol is 10%, preservative is 0.4%, acrylic copolymer is 1.0%, pH adjuster, and the rest is water, and the pH of the system is 5.0; the oxidizing fixative includes, by weight percentage, sodium laureth sulfate 12%, cocamidopropyl betaine 5.5%, hydrogen peroxide 0.5%, disodium ethylenediaminetetraacetate 0.2%, viscosity regulator 1.5%, fragrance 0.3%, pH adjuster, and the rest is water, and the pH of the system is 4.0, and the others are the same as in Example 4.

[0044] Comparative Example 1

[0045] A traditional hair dyeing composition, which uses a mixing method of dye and oxidizing agent, and the dye contains PPD, and the amount of added hydrogen peroxide as oxidizing agent is 6%.

[0046] Comparative Example 1

[0047] A hair dyeing composition, which is different from Example 2 in that ophiopogon japonicus extract is absent in the coloring penetrant, and the others are the same as in Example 2.

[0048] Comparative Example 2

[0049] A hair dyeing composition, which is different from Example 2 in that black sesame extract is absent in the coloring penetrant, and the others are the same as in Example 2.

[0050] Comparative Example 3

[0051] A hair dyeing composition, which is different from Example 2 in that both ophiopogon japonicus extract and black sesame extract are absent in the coloring penetrant, and the others are the same as in Example 2.

[0052] Comparative Example 4

[0053] A hair dyeing composition, which is different from Example 2 in that the pH of the color penetration agent is 7.5, and the others are the same as Example 2.

[0054] Performance test

[0055] The dyeing color fastness, hair damage (tensile strength loss rate), and safety of the above examples and comparative examples were tested, and the test results are shown in Table 1.

[0056] Among them, the white hair coverage is judged by the naked eye.

[0057] The color fastness is represented by the comprehensive color difference ΔE*, and the smaller the change degree of ΔE*, the better the color protection effect. The comprehensive color difference of the dyed hair and the hair after 40 times of washing was compared, which is to measure the color L*, a*, and b* values of the above hair strands (dry hair) after washing the dyed hair in warm water for 30 times using 3NH / NH310 color difference instrument + hair strand fixation mode, the parameter setting is light source (D65), mode (SCE excludes specular light), measurement aperture (8mm), the hair strand measurement sampling point is fixed at the top 7cm, and each 1cm is measured, and the measurement is stopped at 12cm, a total of 6 measurement points, each measurement point is repeated 3 times, and the average value is taken.

[0058] Different from the color difference judgment standard of other industries, the difference of hair color is associated with consumer sensory according to the ΔE* range as shown in the following table: Delta E* range Consumer recognition 0-0.5 Micro, not easily recognized 0.5-1.0 Small, recognized by experts and sensitive consumers 1.0-1.5 Less, recognized by a small number of consumers 1.5-2.0 Medium, recognized by some consumers 2.0-3.0 More, recognized by most consumers ＞3.0 Giant, very easily recognized The safety test is: 30 normal subjects were used for skin patch test, the test hair dye composition sample was diluted to 5% concentration with distilled water, about 0.02-0.04mL of test sample was taken, the control group only used distilled water diluent, and was attached to the skin surface, the skin adverse reaction results were observed according to the skin reaction grading standard, the local skin reaction was observed after 24h of application, and the evaluation standard is shown in the following table.

[0059] Skin reaction Classification No subjective feeling, no skin change ﹣ Local itching, slight redness, unclear edge ± Erythema formation, clear edge, itching + Redness without edema, papule formation, pseudopod around ++ Intense size of vesicles on redness +++

[0060] Table 1 dyeing performance test results Item Color fastness Delta E* Tensile strength loss rate / % Scalp irritation Total dyeing time / min Example 1 0.6 5.0 ﹣ 65 Example 2 0.4 4.6 ﹣ 50 Example 3 0.4 4.7 ﹣ 50 Comparative Example 1 0.4 18.2 ± 40 Comparative Example 1 0.8 6.6 ﹣ 60 Comparative Example 2 0.8 6.2 ﹣ 60 Comparative Example 3 1.1 9.8 ﹣ 65 Comparative Example 4 1.6 12.6 ﹣ 40 According to the dyeing performance test results in Table 1: The hair dyeing composition obtained by the examples 1-3 can achieve a white hair coverage (judged by the naked eye) of more than 95% after dyeing white hair, and the specific results are shown in Table 1, and for large area of white hair, after one time of coloring, a significant dyeing effect can also be achieved, and the specific results are shown in Table 1. Figure 1-3 Figure 4-5 ​As shown, and the tensile strength loss rate after dyeing is ≤5.0%, it can be seen that the hair dyeing composition obtained by the present application has very low damage rate to the hair after dyeing, and has very little irritation to the hair. In addition, after 40 times of water washing, the comprehensive color difference is within 1%, which indicates that the color fastness after dyeing is better, and the effect picture after 30 days of dyeing is as shown in Figure 6 .

[0061] The control example 1 has a white hair coverage rate of more than 98% compared with the hair dyeing composition of the present application, and the dyeing time is lower, but the damage rate to the hair is significantly increased.

[0062] Compared with example 2, when one or both of the extract of polygonum multiflorum and the extract of black sesame are absent in the coloring penetrant, the color fastness of the hair dyeing composition obtained by the comparative examples 1-3 is reduced, and the hair loss rate is increased, the reason is that the combination of the extract of polygonum multiflorum, the extract of black sesame and 5,6-dihydroxyindole or its oligomer can reduce the loss of water in the hair and neutralize part of the oxidative damage during the coloring process, so when the two auxiliary coloring agents are absent, the damage to the hair will increase to a certain extent.

[0063] Compared with example 2, when the pH of the coloring penetrant is >7, the hair loss rate of the hair dyeing composition of the comparative example 4 is significantly increased, and the color fastness is significantly reduced, the reason may be that under alkaline conditions, the chemical activity of 5,6-dihydroxyindole or its oligomer will increase sharply, and the oxidation polymerization reaction rate will be accelerated, so that the dyeing time is shortened, but the dye will be oxidized and polymerized on the surface of the hair, and cannot effectively penetrate into the inside of the hair, resulting in easy peeling of the coloring agent, so the color fastness is poor, and in the alkaline environment, the barrier of the hair cuticle is destroyed, causing the water in the hair to be more easily lost, so that the dyed hair becomes dry and rough.

[0064] The examples of the specific embodiment are the preferred embodiments of the present application, but do not limit the protection scope of the present application, so: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A mild acidic hair dyeing composition based on indole and plant extracts, characterized in that: The composition comprises a coloring penetrant and an oxidation fixing agent used separately, the coloring penetrant comprises an effective coloring amount of 5,6-dihydroxyindole or its oligomer, extract of polygonum multiflorum and extract of black sesame; the oxidation fixing agent comprises 0.5-3.0 wt% of hydrogen peroxide.

2. Mild acidic hair dye composition based on indole and plant extracts according to claim 1, characterized in that: The content of 5,6-dihydroxyindole or its oligomer in the coloring penetrant is 0.5-2 wt%, the content of extract of polygonum multiflorum is 0.05-5.0 wt%, and the content of extract of black sesame is 0.05-5.0 wt%.

3. Mild acidic hair dye composition based on indole and plant extracts according to claim 1, characterized in that: The oligomer is polydihydroxyindole, and the degree of polymerization is 2-3.

4. Mild acidic hair dye composition based on indole and plant extracts according to claim 1 or 2, characterized in that: The pH of the coloring penetrant system is 3.5-6.0, and the pH of the oxidation fixing agent system is 3.0-4.

0.

5. Mild acidic hair dye composition based on indole and plant extracts according to claim 4, characterized in that: The composition is in the form of paste or emulsion, and the emulsion is used for daily use of contact dyeing.

6. Mild acidic hair dye composition based on indole and plant extracts according to claim 5, characterized in that: The coloring penetrant in the paste composition comprises, by weight percentage: 5,6-dihydroxyindole or its oligomer 0.5-2%, extract of polygonum multiflorum 0.05-5.0%, extract of black sesame 0.05-5.0%, cetearyl alcohol 10-14%, glyceryl stearate 2-4%, sodium laureth sulfate 6-10%, cocamidopropyl betaine 1-5%, propylene glycol 3-6%, pH adjuster and the balance of water; The oxidation fixing agent comprises, by weight percentage: disodium ethylenediaminetetraacetate 0.1-0.2%, acrylates / C10-30 alkyl acrylate crosspolymer 0.5-1.0%, hydrogen peroxide 0.5-3.0%, glycerin 2-4%, cetearyl alcohol 4-6%, pH adjuster and the balance of water.

7. A mild acid hair dye composition based on indole and plant extracts according to claim 5, characterized in that: The coloring penetrant in the emulsion composition comprises, by weight percentage: 5,6-dihydroxyindole or its oligomer 0.5-2%, extract of polygonum multiflorum 0.05-5.0%, extract of black sesame 0.05-5.0%, dimethicone 2-3%, polyquaternium 1.5-2%, ethanol 10-15%, preservative 0.4-0.5%, acrylates copolymer 1.0-1.5%, pH adjuster and the balance of water; The oxidation fixing agent comprises, by weight percentage: sodium laureth sulfate 10-12%, cocamidopropyl betaine 3.5-5.5%, hydrogen peroxide 0.5-3.0%, disodium ethylenediaminetetraacetate 0.1-0.2%, viscosity regulator 1.0-1.5%, pH adjuster and the balance of water.

8. A process for the preparation of a mild acid hair dye composition based on indole and plant extracts as claimed in claim 6, characterized in that, The preparation of the paste coloring penetrant comprises the following steps: S1, heat and dissolve cetearyl alcohol and glyceryl stearate; S2, stir and heat sodium laureth sulfate, cocamidopropyl betaine and propylene glycol; S3, add step S2 into step S1 under stirring and mix; S4, after cooling to below 45℃, add 5,6-dihydroxyindole or its oligomer, extract of polygonum multiflorum and extract of black sesame and stir uniformly; S5, adjust the pH of the system with aqueous citric acid solution; S6, cool and discharge; The preparation of the paste oxidation fixing agent comprises the following steps: S1, dissolve disodium ethylenediaminetetraacetate in water, and then add acrylates / C10-30 alkyl acrylate crosspolymer and disperse uniformly; S2, hydrogen peroxide was added under stirring; S3, glycerin and cetyl stearyl alcohol were heated and dissolved, then added into step S2; S4, the pH of the paste was adjusted by pH regulator, then cooled and discharged.

9. A process for the preparation of a mild acid hair dye composition based on indole and plant extracts as claimed in claim 7, characterized in that, The preparation of the emulsion-like coloring penetrant includes the following steps: S1, water, polyquaternary ammonium salt and citric acid were mixed and stirred until dissolved; S2, extract of semen astragali and extract of black sesame were added into step S1 and stirred until uniform; S3, 5, 6-dihydroxyindole or its oligomer was dissolved in ethanol, then polydimethylsiloxane, acrylic copolymer and preservative were added and mixed until uniform; S4, the mixture obtained in step S3 was added into step S2 under stirring to form an emulsion; The preparation of the emulsion-like oxidative fixing agent includes the following steps: S1, disodium ethylenediaminetetraacetate, sodium laureth sulfate and cocamidopropyl betaine were dissolved in water under stirring; S2, the pH of the system was adjusted by pH regulator; S3, hydrogen peroxide was added under stirring, then viscosity regulator was added and stirred until uniform.

Images