A hair dye, its preparation method and application

Abstract

This application discloses a hair dye, its preparation method, and its application, characterized by comprising agent A and agent B; agent A contains indigo, thickener, surfactant, organic solvent, and water; agent B contains madder extract and other natural plant extracts, thickener, surfactant, and water; the natural plant extracts are obtained through the following steps: the natural plants are pulverized and mixed, 1 to 1.5 times the total weight of the natural plants is added to water, and the mixture is sonicated at 45 to 55°C for 1.5 to 3 hours, then centrifuged, and the supernatant is the natural plant extract; the natural plants are selected from at least one of Polygonum multiflorum, chestnut peel, walnut husk, Eclipta prostrata, Perilla frutescens extract, ginger, and Sophora japonica buds.

Description

Technical Field

[0001] This application relates to a hair dye, its preparation method, and its application, and belongs to the field of cosmetics. Background Technology

[0002] With the booming development of the fashion industry, hair dyeing has become a popular hair styling method. Not only do older people need to dye their hair to cover gray hair, but young people are also keen to express their individuality and fashion attitude through hair dyeing. This trend has greatly promoted the development of the hair dye market, making the demand for hair dye increasingly diversified.

[0003] With increasing awareness of health and environmental protection, consumers are paying more and more attention to the safety of hair dyes. Traditional hair dyes often contain chemicals with toxic side effects, such as phenylenediamine and resorcinol, which may trigger allergic reactions and even pose a carcinogenic risk. Therefore, consumers prefer to choose safe, non-toxic, and natural hair dye products. Many natural plants in traditional Chinese medicine, such as gallnut, fleeceflower root, sappanwood extract, black sesame, black beans, henna, and chrysanthemum, are derived from nature and are very safe to use in the preparation of dyes, and they also have nourishing effects on hair and the body; however, hair dyes developed solely from these plants often have drawbacks such as poor effect, low color retention, and short color duration. The development of this hair dye aims to overcome the shortcomings of existing hair dyes and improve both the coloring effect and safety. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art by providing a method for preparing a compound hair dye and a hair dyeing method.

[0005] According to one aspect of this application, a mild hair dye is provided, comprising agent A and agent B;

[0006] Agent A contains indigo, thickener, surfactant, organic solvent and water;

[0007] Agent B contains madder extract, natural plant extract, thickener, surfactant, and water;

[0008] The madder extract and other natural plant extracts are obtained through the following steps:

[0009] After crushing and mixing the natural plants, add 1 to 1.5 times the total weight of the natural plants in water, sonicate at 45 to 55°C for 1.5 to 3 hours, then centrifuge. The supernatant is the natural plant extract.

[0010] The natural plant is selected from at least one of the following: Polygonum multiflorum, walnut green husk, Eclipta prostrata, Rubia cordifolia, Lithospermum erythrorhizon, ginger, and Sophora japonica buds.

[0011] The surfactant is selected from at least one of lauryl polyoxyethylene ether, sophorolipid, glyceryl monostearate, sophorolipid, sodium cocoyl malic acid, cetyltrimethylammonium chloride, cetyl alcohol, and disodium sulfosuccinate.

[0012] The thickener is selected from at least one of the following: soy protein, sodium carboxymethyl cellulose, carboxymethyl cellulose, carboxyethyl cellulose, chitosan, starch, gelatin, sodium alginate, polyethylene glycol, and xanthan gum.

[0013] The organic solvent is selected from at least one of ethanol, propylene glycol, benzyl alcohol, isopropanol, glycerol, and N-methylpyrrolidone.

[0014] In agent A, the total mass is 100 wt%, and the mass content of each component is as follows:

[0015] Indigo 0.01–0.2 wt%;

[0016] Thickener 0.5–2.0 wt%;

[0017] Surfactant 2-6 wt%;

[0018] Organic solvent 1-10 wt%;

[0019] The rest is water;

[0020] The pH of agent A is 4-6, which is adjusted by adding at least one of acetic acid, citric acid, lactic acid, phosphoric acid, and tartaric acid.

[0021] In the agent B, the total mass is 100 wt%, and the mass content of each component is as follows:

[0022] Madder extract 5-10 wt%;

[0023] 8-15 wt% natural plant extract;

[0024] Thickener 0.5–2.0 wt%;

[0025] Surfactant 2-6 wt%;

[0026] The rest is water;

[0027] The pH of agent B is 4-6, which is adjusted by adding at least one of acetic acid, citric acid, lactic acid, phosphoric acid, and tartaric acid.

[0028] According to another aspect of this application, a method for preparing the above-mentioned mild hair dye is provided, comprising the following steps:

[0029] The preparation method of agent A includes the following steps:

[0030] Water, organic solvent, thickener, and surfactant are mixed and homogenized at 60–75°C. When the temperature is reduced to 45–55°C, the pH is adjusted to 4–7, indigo is added, and the mixture is stirred to obtain agent A.

[0031] The preparation method of agent B includes the following steps:

[0032] Water, thickener, and surfactant are mixed and homogenized at 60–75°C. When the temperature drops to 45–55°C, the pH is adjusted to 4–6, and madder extract and other natural plant extracts are added and stirred to obtain agent B.

[0033] According to another aspect of this application, a hair dyeing method is provided, characterized by comprising the following steps:

[0034] Immerse the hair in agent A at a dyeing-finishing bath ratio of 1:101:50, maintaining a temperature of 36-40℃ for 20-60 minutes. Then, immerse the hair in agent B at a dyeing-finishing bath ratio of 1:101:50, maintaining a temperature of 36-50℃ for 20-60 minutes. After immersion, remove the hair, wash it, and let it air dry naturally.

[0035] The beneficial effects that this application can produce include:

[0036] 1) The present invention improves the formula of hair dye, and the dyes used are all natural pigments and natural plant extracts, which are less irritating to the scalp and are less likely to cause adverse reactions such as redness, swelling and itching after use.

[0037] 2) Although the mild hair dye provided by this invention may not be as long-lasting as hair dyes containing chemicals such as phenylenediamine and resorcinol, its dyeing effect is relatively mild and the fading process is more natural, without putting too much burden on the hair.

[0038] 3) The mild hair dye provided by this invention causes less damage to the hair compared to traditional hair dyes, making it more suitable for those who are worried about damaging their hair quality when dyeing their hair. Detailed Implementation

[0039] The present application is described in detail below with reference to the embodiments, but the present application is not limited to these embodiments.

[0040] The natural plant extracts used in the embodiments of this application were prepared by the following method:

[0041] After crushing and mixing the natural plants, add 1-1.5 times the total weight of the plants in deionized water and sonicate at 45-55℃ for 1.5-3 hours; then centrifuge, and the resulting supernatant is the natural plant extract.

[0042] Example 1

[0043] (1) Preparation of Agent A:

[0044] Heat 86wt% solvent water to 68℃, and while stirring, add 2.0wt% sodium alginate, 4.5wt% cetyl alcohol, and 7% glycerol in sequence. Then homogenize with a disperser for 8 minutes. When the temperature drops to about 48℃, adjust the pH to 4 with citric acid. Add 0.16wt% indigo while stirring, and stir evenly to obtain the final product.

[0045] (2) Preparation of Agent B:

[0046] Heat 81wt% solvent water to 68℃, and while stirring, add 0.5wt% xanthan gum, 0.5wt% chitosan, and 3wt% sophorolipid in sequence. Then homogenize with a disperser for 8 minutes. When the temperature drops to about 48℃, adjust the pH to 4 with citric acid. While stirring, add 5wt% madder root extract and 10wt% Polygonum multiflorum extract, and stir evenly to obtain the final product.

[0047] (3) Hair dyeing steps

[0048] Immerse the hair in agent A at a dyeing-to-finishing bath ratio of 1:30, maintain the temperature at 37℃, and dye for 40 minutes. Remove the hair and then immerse it in agent B at a dyeing-to-finishing bath ratio of 1:30, maintain the temperature at 37℃, and dye for 40 minutes. Remove the hair, wash it, and let it air dry.

[0049] The effect of this hair dye is to color keratin fibers, especially human hair, black.

[0050] Example 2

[0051] (1) Preparation of Agent A:

[0052] Heat 91wt% solvent water to 60℃, and while stirring, add 1.0wt% gelatin, 4wt% sophorolipid and 3% N-methylpyrrolidone in sequence. Then homogenize with a disperser for 5 minutes. When the temperature drops to about 46℃, adjust the pH to 5 with lactic acid. Add 0.06wt% indigo while stirring and stir evenly to obtain the final product.

[0053] (2) Preparation of Agent B:

[0054] Heat 75% solvent water to 60℃, and while stirring, add 1.0% chitosan and 4.5% disodium sulfosuccinate monoester in sequence. Then homogenize with a disperser for 5 minutes. When the temperature drops to about 46℃, adjust the pH to 5 with lactic acid. While stirring, add 6wt% madder root extract and 13wt% sophora japonica flower extract, and stir evenly to obtain the final product.

[0055] (3) Hair dyeing steps

[0056] Immerse the hair in agent A at a dyeing-to-finishing bath ratio of 1:20, maintain the temperature at 39℃, and dye for 20 minutes. Then remove the hair and immerse it in agent B at a dyeing-to-finishing bath ratio of 1:20, maintain the temperature at 39℃, and dye for 20 minutes. Remove the hair, wash it, and let it air dry.

[0057] The effect of this hair dye is to color the keratin fibers, especially human hair, brown.

[0058] Example 3

[0059] (1) Preparation of Agent A:

[0060] Heat 91wt% solvent water to 72℃, and while stirring, add 1.5wt% sodium carboxymethyl cellulose, 3wt% sodium cocoyl malic acid, and 4wt% benzyl alcohol in sequence. Then, homogenize with a disperser for 5 minutes. When the temperature drops to about 50℃, adjust the pH to 5 with citric acid. Add 0.08wt% indigo while stirring, and stir evenly to obtain the final product.

[0061] (2) Preparation of Agent B:

[0062] Heat 74 wt% solvent water to 72°C, and while stirring, add 1.5 wt% carboxymethyl cellulose, 3 wt% sodium cocoyl malic acid, and 4 wt% benzyl alcohol in sequence. Then, homogenize using a disperser for 5 minutes. When the temperature drops to 50°C, adjust the pH to 5 with citric acid. While stirring, add 8 wt% madder root extract and 9 wt% walnut green husk extract, and stir until homogeneous to obtain the final product.

[0063] (3) Hair dyeing steps

[0064] Immerse the hair in agent A at a dyeing-to-finishing bath ratio of 1:35, maintain the temperature at 37℃, and dye for 30 minutes. Then remove the hair and immerse it in agent B at a dyeing-to-finishing bath ratio of 1:35, maintain the temperature at 37℃, and dye for 30 minutes. Remove the hair, wash it, and let it air dry.

[0065] The effect of this hair dye is to color the keratin fibers, especially human hair, to a brownish-black color.

[0066] Example 4

[0067] (1) Preparation of Agent A:

[0068] Heat 91wt% solvent water to 70℃, and while stirring, add 0.6wt% carboxymethyl cellulose, 0.6wt% chitosan, 2wt% hexadecyltrimethylammonium chloride, and 5wt% isopropanol in sequence. Then, homogenize with a disperser for 5 minutes. When the temperature drops to about 50℃, adjust the pH to 5 with tartaric acid. Add 0.1wt% indigo while stirring, and stir until homogeneous to obtain the final product.

[0069] (2) Preparation of Agent B:

[0070] Heat 78wt% solvent water to 70℃, and while stirring, add 1.8wt% polyethylene glycol, 2wt% sophorolipid, and 2.5wt% cetyl alcohol in sequence. Then homogenize with a disperser for 5 minutes. When the temperature drops to about 50℃, adjust the pH to 5 with tartaric acid. While stirring, add 5wt% madder root extract and 10wt% eclipta extract, and stir evenly to obtain the final product.

[0071] (3) Hair dyeing steps

[0072] Immerse the hair in agent A at a dyeing-to-finishing bath ratio of 1:50, maintain the temperature at 37.5℃, and dye for 30 minutes. Remove the hair and then immerse it in agent B at a dyeing-to-finishing bath ratio of 1:50, maintain the temperature at 37.5℃, and dye for 30 minutes. Remove the hair, wash it, and let it air dry.

[0073] The effect of this hair dye is to color the keratin fibers, especially human hair, to a brownish-black color.

[0074] Example 5

[0075] (1) Preparation of Agent A:

[0076] Heat 90% solvent water to 75°C, and while stirring, add 2.0 wt% carboxyethyl cellulose, 5 wt% glyceryl monostearate, and 2 wt% ethanol in sequence. Then homogenize using a disperser for 8 minutes. When the temperature drops to about 48°C, adjust the pH to 6 with acetic acid. Add 0.04 wt% indigo while stirring, and stir until homogeneous to obtain the final product.

[0077] (2) Preparation of Agent B:

[0078] Heat 78wt% solvent water to 75℃, and while stirring, add 1.7wt% soy protein and 2wt% lauryl alcohol polyoxyethylene ether in sequence. Then homogenize with a disperser for 8 minutes. When the temperature drops to about 48℃, adjust the pH to 6 with acetic acid. While stirring, add 10wt% madder extract and 8wt% turmeric extract, and stir evenly to obtain the final product.

[0079] (3) Hair dyeing steps

[0080] Immerse the hair in agent A at a dyeing bath ratio of 1:10, maintain the temperature at 38℃, and dye for 25 minutes. Then remove the hair and immerse it in agent B at a dyeing bath ratio of 1:10, maintain the temperature at 38℃, and dye for 25 minutes. Remove the hair, wash it, and let it air dry.

[0081] The effect of this hair dye is to color the keratin fibers, especially human hair, to a reddish-brown color.

[0082] No significant color change was observed when the hair samples dyed in the above embodiments were placed at different temperatures ranging from -10 to 40°C for 1 month and 3 months. The dyed hair was washed repeatedly with water 10 and 30 times, and the color did not change significantly, indicating that these hair dyes have good dyeing effect and long-lasting color.

[0083] The above description is merely a few embodiments of this application and is not intended to limit this application in any way. Although this application discloses preferred embodiments as described above, it is not intended to limit this application. Any changes or modifications made by those skilled in the art without departing from the scope of the technical solution of this application using the disclosed technical content are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A hair dye, characterized in that, Including agent A and agent B; Agent A contains indigo, thickener, surfactant, organic solvent and water; Agent B contains madder extract, natural plant extract, thickener, surfactant, and water; The madder extract and natural plant extracts are obtained through the following steps: After crushing and mixing the natural plants, add 1 to 1.5 times the total weight of the natural plants in water, sonicate at 45 to 55°C for 1.5 to 3 hours, then centrifuge. The supernatant is the natural plant extract. The natural plant is selected from at least one of the following: Polygonum multiflorum, walnut green husk, Eclipta prostrata, Rubia cordifolia, Lithospermum erythrorhizon, ginger, and Sophora japonica buds.

2. The hair dye according to claim 1, characterized in that, The surfactant is selected from at least one of lauryl polyoxyethylene ether, sophorolipid, glyceryl monostearate, sophorolipid, sodium cocoyl malic acid, cetyltrimethylammonium chloride, cetyl alcohol, and disodium sulfosuccinate. The thickener is selected from at least one of the following: soy protein, sodium carboxymethyl cellulose, carboxymethyl cellulose, carboxyethyl cellulose, chitosan, starch, gelatin, sodium alginate, polyethylene glycol, and xanthan gum. The organic solvent is selected from at least one of ethanol, benzyl alcohol, isopropanol, glycerol, and N-methylpyrrolidone.

3. The hair dye according to claim 1, characterized in that, In agent A, the total mass is 100 wt%, and the mass content of each component is as follows: Indigo 0.01–0.2 wt%; Thickener 0.5–2.0 wt%; Surfactant 2-6 wt%; Organic solvent 1-10 wt%; The rest is water; The pH of agent A is 4-6, which is adjusted by adding at least one of acetic acid, citric acid, lactic acid, phosphoric acid, and tartaric acid.

4. The hair dye according to claim 1, characterized in that, In the agent B, the total mass is 100 wt%, and the mass content of each component is as follows: Madder extract 5-10 wt%; 8-15 wt% natural plant extract; Thickener 0.5–2.0 wt%; Surfactant 2-6 wt%; The rest is water; The pH of agent B is 4-6, which is adjusted by adding at least one of acetic acid, citric acid, lactic acid, phosphoric acid, and tartaric acid.

5. A method for preparing a hair dye according to any one of claims 1 to 4, characterized in that, Includes the following steps: The preparation method of agent A includes the following steps: Water, organic solvent, thickener, and surfactant are mixed and homogenized at 60–75°C. When the temperature is reduced to 45–55°C, the pH is adjusted to 4–7, indigo is added, and the mixture is stirred to obtain agent A. The preparation method of agent B includes the following steps: Water, thickener, and surfactant are mixed and homogenized at 60–75°C. When the temperature drops to 45–55°C, the pH is adjusted to 4–6, and madder extract and natural plant extract are added and stirred to obtain agent B.

6. A hair dyeing method, characterized in that, Includes the following steps: Immerse the hair in agent A at a dyeing-finishing bath ratio of 1:101:50, maintaining a temperature of 36-40℃ for 20-60 minutes. Then, immerse the hair in agent B at a dyeing-finishing bath ratio of 1:101:50, maintaining a temperature of 36-50℃ for 20-60 minutes. After immersion, remove the hair, wash it, and let it air dry naturally.