Low-irritation essential oil hair dye and preparation method thereof

Abstract

The invention relates to the field of hair dyeing products, in particular to a low-irritation essential oil hair dye and a preparation method thereof. The invention relates to a low-irritation essential oil hair dye, which comprises a No.1 agent and a No.2 agent, the No.1 agent comprises a humectant, a hair coloring agent, an antioxidant, a chelating agent and a solvent A; a thickening agent A, an emulsifier A and a hair conditioner; a pH regulator A, and polydimethylsiloxane; the disinfectant is prepared from an aromatic A, polyquaternium-7, polyquaternium-10, argania spinosa kernel oil, a camellia extract, a ginger root extract and a preservative; the agent 2 comprises a solvent B, cetearyl trimethyl ammonium chloride, sodium stannate and a pH regulator B; a thickener B, an emulsifier B and mineral oil; a chelating agent C; and an oxidant. The hair dye provided by the invention can reduce irritation under the condition of ensuring the hair dyeing effect and relieve the frizz degree of dyed hair, and has a plurality of advantages.

Description

Technical Field

[0001] The present invention relates to the field of hair dye products, and more specifically, to a low-irritation essential oil hair dye and a preparation method thereof. Background Art

[0002] In the modern society that pursues fashion and individuality, hair dyeing has become a part of the daily life of many consumers. It not only highlights personality, but also enhances personal charm.

[0003] However, although common chemical ingredients in traditional hair dyes, such as phenylenediamines and hydrogen peroxide, perform well in hair dyeing, their potential irritation cannot be ignored. These chemical ingredients may damage the natural protective layer of the hair during use, causing scalp allergies, redness, hair damage, and even more serious health problems. Especially after dyeing hair, the chemical ingredients destroy the lipid layer of the hair, causing the hair to lose moisture and nutrition, resulting in a loose hair structure and easy breakage. This also makes the hair prone to becoming frizzy, dry, and lackluster.

[0004] In the face of this situation, the research and development of low-irritation hair dyes is particularly important. However, the research and development of low-irritation hair dyes faces many challenges, the most important of which is how to reduce the irritation of hair dyes while ensuring the hair dyeing effect. The irritating ingredients in traditional hair dyes usually have high hair dyeing performance, while low-irritation ingredients may be difficult to meet market demand due to their weak effects. In addition, the phenomenon of frizzy hair after dyeing is another problem that needs to be solved in the research and development of low-irritation hair dyes. Summary of the invention

[0005] In order to reduce irritation while ensuring the hair dyeing effect and alleviate the frizziness of the hair after dyeing, the present application provides a low-irritation essential oil hair dye and a preparation method thereof.

[0006] In the first aspect, the present application provides a low-irritation essential oil hair dye, which adopts the following technical solution: A low-irritation essential oil hair dye, comprising agent No. 1 and agent No. 2, wherein the mass ratio of agent No. 1 to agent No. 2 is 1:(0.8-1.2); Agent No. 1, in terms of mass percentage, comprises the following components: Phase 1A: 5-15% moisturizer, 0.2-5% hair colorant, 0.5-1.5% antioxidant, 0.1-0.5% chelating agent A, solvent A; Phase 1B: 8-12% thickener A, 4-13% emulsifier A, 5-20% hair conditioner; Phase 1C: 1-8% pH adjuster A, 0.5-3% polydimethylsiloxane; Phase 1D: 0-1% fragrance A, 0.1-1.5% alcohol solvent A, 0.01-2% chelating agent B, 0.1-3% polyquaternium-7, 0.1-0.5% polyquaternium-10, 0.01-2% argania spinosa kernel oil, 0.01-2% camellia extract, 0.01-2% ginger root extract, 0.01-1% sorbitol, 0.01-1% glucose, 0.01-1% PCA sodium, 0.01-1% glycine, 0.01-1% hexylene glycol, 0.01-1% ethylhexylglycerin, 0.01-1% preservative; Agent No. 2, in terms of mass percentage, comprises the following components: Phase 2A: solvent B, 0.1-1% alcohol solvent B, 0.2-1.5% cetearyl trimethyl ammonium chloride, 0.01-0.2% sodium stannate, 0.1-1% pH adjuster B; Phase 2B: 1.5-5% thickener B, 0.2-1.5% emulsifier B, 0.2-1.5% mineral oil; Phase 2C: 0.2-1.2% chelating agent C; Phase 2D: 1.5-12% oxidant, 0-0.5% aromatic B.

[0007] This application adds three plant extracts, namely, Argania spinosa kernel oil, camellia extract, and ginger root extract, which have a soothing effect and can reduce the sensitivity and discomfort of the scalp when dyeing hair. Antioxidant ingredients such as gingerol in ginger root extract can also reduce the damage of external free radicals to the scalp, thereby reducing the inflammatory response of the scalp. Therefore, the hair dye provided by this application is less irritating to the scalp and is more suitable for people with sensitive scalp and those who pursue healthy hair dyeing.

[0008] In addition, the active ingredients contained in argan oil, camellia extract, and ginger root extract can help the hair absorb the hair colorant more fully, improve the surface tension of the hair, and make it easier for the hair colorant to penetrate into the hair, making the hair coloring last longer and not easy to fall off. Then, it can also promote the argan oil to form a protective film on the surface of the hair, providing good conditions for the hair colorant to penetrate the hair, thereby improving the dyeing effect.

[0009] The combination of Argania spinosa kernel oil, camellia extract, and ginger root extract can also nourish the hair and provide the necessary nutrients for the hair, thereby indirectly enhancing the dyeing effect and making the color more full and lasting. The active ingredients contained in it can also protect the hair from oxidative damage and help maintain the color brightness after dyeing. It also promotes blood circulation in the scalp, improves the scalp environment, and provides better growth conditions for the hair, thereby indirectly promoting the absorption and penetration of the colorant in the hair dye.

[0010] The use of argan oil, camellia extract, and ginger root extract can not only promote the absorption of hair colorants by hair, making the dyeing effect better and more lasting, but also moisturize and strengthen the hair, alleviate the damage to the hair caused by the use of oxidants, and make the hair smoother and less frizzy after dyeing. In addition, due to the improved dyeing effect, the use of hair dye can be reduced in actual use, further reducing irritation to the scalp.

[0011] Preferably, according to the mass percentage of the No. 1 agent, the content of argania spinosa kernel oil is 1.5-2%, the content of camellia extract is 0.1-0.5%, and the content of ginger root extract is 0.5-1.5%.

[0012] By adopting the above technical solution, the dosage of Argania spinosa kernel oil, camellia extract, and ginger root extract in Agent No. 1 is further limited, so that the synergistic effect of the three can be more fully exerted. It helps to reduce scalp sensitivity, reduce scalp inflammatory reactions, promote the absorption of hair colorants, improve the surface tension of hair, make the color easier to penetrate into the hair core, form a protective film, and improve the dyeing effect. At the same time, it nourishes the hair, enhances the color saturation and durability, protects the hair from oxidative damage, further reduces scalp irritation, and makes the hair smooth and not frizzy after dyeing.

[0013] Preferably, the No. 1 agent also includes ginseng leaf / stem extract and Polygonum multiflorum extract.

[0014] Preferably, according to the mass percentage of the No. 1 agent, the ginseng leaf / stem extract is 0.01-2%, and the Polygonum multiflorum extract is 0.01-2%.

[0015] By adopting the above technical solution, ginseng leaf / stem extract and Polygonum multiflorum extract are further added to the hair dye, which have a soothing effect and can reduce the sensitivity and discomfort of the scalp during the hair dyeing process. And to a certain extent, it can moisturize the hair, reduce the dryness and split ends of the hair, and make the hair smoother after dyeing.

[0016] Preferably, the pH adjuster A comprises ethanolamine and ammonium hydroxide.

[0017] Preferably, the pH regulator A is ethanolamine and ammonium hydroxide. According to the mass percentage of agent No. 1, ethanolamine is 0.5-2%, and ammonium hydroxide is 1-3%.

[0018] Ethanolamine is alkaline and can effectively adjust the pH value of hair dye. In the hair dyeing process, the appropriate pH value is crucial for the dye molecules to penetrate into the cortex of the hair. It can promote the better absorption of hair colorant dyes by the hair, making the color more durable and uniform.

[0019] Compared with traditional ammonia as a pH adjuster, ethanolamine is much less irritating. Ammonia has a strong pungent odor and may cause certain damage to the hair and scalp. As a substitute for ammonia, ethanolamine can significantly reduce the pungent odor of hair dyes, reduce irritation to hair and scalp, and improve user experience.

[0020] Ammonium hydroxide is somewhat volatile and will gradually evaporate from the hair during the dyeing process. This property helps reduce the amount of chemicals remaining in the hair after dyeing and reduces irritation to the scalp.

[0021] Ethanolamine and ammonium hydroxide can also protect the health of hair to a certain extent during the hair dyeing process. They help open the hair scales, making it easier for dye molecules to enter the hair, but compared with ammonia, it is less damaging to the hair and scalp. Therefore, using hair dyes containing ethanolamine can reduce the damage to hair caused by dyeing to a certain extent.

[0022] By adopting the above technical solution, ethanolamine and ammonium hydroxide are selected as pH regulators, and the amounts of the two in the system are limited, the pH value can be well adjusted and the absorption of hair colorants can be promoted, while irritation and damage to hair can be reduced.

[0023] Preferably, the hair colorant includes toluene-2,5-diamine sulfate, resorcinol, p-aminophenol, and 2-amino-4-hydroxyethylaminoanisole sulfate.

[0024] By adopting the above technical scheme, the hair colorant is toluene-2,5-diamine sulfate, resorcinol, p-aminophenol, and 2-amino-4-hydroxyethylaminoanisole sulfate. According to the mass percentage of agent No. 1, toluene-2,5-diamine sulfate is 0.2-1%, resorcinol is 0.1-0.5%, p-aminophenol is 0.3-1%, and 2-amino-4-hydroxyethylaminoanisole sulfate is 0.03-0.1%.

[0025] In a second aspect, the present application provides a method for preparing a low-irritation essential oil hair dye, using the following technical solution: A method for preparing a low-irritation essential oil hair dye comprises the following steps: Step a: Preparation of dose 1, comprising the following steps: Step a1: Mix the raw materials of phase 1A at 80-90° C. to obtain phase 1A; mix the raw materials of phase 1B at 80-90° C. until they are completely dissolved to obtain phase 1B; Step a2: Mix phase 1A and phase 1B, and stir homogenously for 5-10 minutes to obtain phase 1AB; Step a3: Mix the raw materials of phase 1AB and phase 1C at 50-60° C. and stir evenly to obtain phase 1ABC; Step a4: Stir the raw materials of phases 1ABC and 1D at 40-50°C to obtain agent No. 1; Step b: preparing dose 2, comprising the following steps: Step b1: Mix the raw materials of phase 2A at 80-90° C. to obtain phase 2A; mix the raw materials of phase 2B at 80-90° C. until they are completely dissolved to obtain phase 2B; Step b2: Mix phase 2A and phase 2B, and stir homogenously for 5-10 minutes to obtain phase 2AB; Step b3: Mix the raw materials of the 2AB phase and the 2C phase at 50-60° C. and stir evenly to obtain the 2ABC phase; Step b4: Stir the raw materials of 2ABC phase and 2D phase evenly at 40-50°C to obtain agent No. 2; Step c: Mix agent No. 1 and agent No. 2 until they are uniformly mixed to obtain a low-irritation essential oil hair dye.

[0026] In summary, this application has the following beneficial effects: 1. The hair dye of the present application is added with argan oil, camellia extract and ginger root extract. These natural ingredients show good soothing effect during the hair dyeing process, effectively reducing scalp sensitivity and discomfort; they can resist the invasion of external free radicals and reduce scalp inflammatory reactions, making the hair dye mild and non-irritating. It is tailored for people with sensitive scalp and those who pursue a healthy hair dyeing experience, achieving dual care of color and health.

[0027] 2. In this application, the synergistic effect of argania spinosa kernel oil, camellia extract and ginger root extract is preferred. The active ingredients they contain not only promote the deep absorption of the hair colorant by the hair, but also improve the surface tension of the hair, so that the hair colorant can easily penetrate into the hair core. The protective film formed by argania spinosa kernel oil and the like on the hair provides an ideal penetration environment for the hair colorant, significantly improving the dyeing effect. This combination makes the hair dyeing process more efficient, the color is more uniform and full, while reducing the amount of hair dye used and reducing irritation to the scalp.

[0028] 3. Argania spinosa kernel oil, camellia extract and ginger root extract work together to provide nutrition for hair, enhance the toughness of hair, and alleviate the damage to hair caused by oxidants during the hair dyeing process. The dyed hair is still soft and smooth, not frizzy, and the color is bright and long-lasting. In addition, they can promote scalp blood circulation, improve the scalp environment, and provide better growth conditions for hair. The hair dye of this application not only improves the hair dyeing effect, but also keeps the hair healthy and energetic after dyeing. DETAILED DESCRIPTION

[0029] The present application is further described in detail below with reference to the embodiments.

[0030] The raw materials used in the following examples and comparative examples are all commercially available products. Example

[0031] Example 1 A low-irritation essential oil hair dye comprises a No. 1 agent and a No. 2 agent, wherein the mass ratio of the No. 1 agent to the No. 2 agent is 1:1.

[0032] Agent No. 1 includes the following components: Phase 1A: moisturizer, hair colorant, antioxidant, chelating agent A, solvent A.

[0033] The humectants are glycerin and propylene glycol.

[0034] Hair coloring agent is The antioxidants are sodium isoascorbate and sodium sulfite.

[0035] Chelating agent A is disodium EDTA.

[0036] Solvent A is water.

[0037] Phase 1B: thickener A, emulsifier A, hair conditioning agent.

[0038] Thickener A is cetearyl alcohol.

[0039] Emulsifier A is ceteareth-25, glyceryl stearate, and stearic acid.

[0040] The hair conditioning agents are petrolatum, isopropyl myristate, paraffin, and cetearyl trimethyl ammonium chloride.

[0041] Phase 1C: pH adjuster A, polydimethylsiloxane.

[0042] pH adjuster A is ethanolamine or ammonium hydroxide.

[0043] Phase 1D: Fragrance A, Alcohol Solvent A, Chelating Agent B, Polyquaternium-7, Polyquaternium-10, Argania Spinosa Kernel Oil, Camellia Sinensis Extract, Panax Ginseng Leaf / Stem Extract, Polygonum Multiflorum Extract, Ginger Root Extract, Sorbitol, Glucose, Sodium PCA, Glycine, Hexylene Glycol, Ethylhexylglycerin, Preservatives.

[0044] Aromatherapy agent A is fragrance.

[0045] The alcohol solvent A is ethanol.

[0046] Chelating agent B is disodium EDTA and sodium sulfate.

[0047] See Table 1 for details.

[0048] Agent No. 2 includes the following components: Phase 2A: solvent B, alcohol solvent B, cetearyl trimethyl ammonium chloride, sodium stannate, and pH adjuster B.

[0049] Solvent B is water.

[0050] The alcohol solvent B is ethanol.

[0051] The pH adjuster B is disodium hydrogen phosphate.

[0052] Phase 2B: thickener B, emulsifier B, mineral oil.

[0053] Thickener B is cetearyl alcohol.

[0054] Emulsifier B is ceteareth-25.

[0055] Phase 2C: Chelating agent C.

[0056] Chelating agent C is etidronate.

[0057] Phase 2D: oxidant, aromatic agent B.

[0058] The oxidizing agent is hydrogen peroxide.

[0059] Aromatherapy agent B is fragrance.

[0060] See Table 2 for details.

[0061] The present application also provides a method for preparing a low-irritation essential oil hair dye, comprising the following steps: Step a: Preparation of dose 1, comprising the following steps: Step a1: Put the raw materials of phase 1A into an emulsifying pot and mix them at 85° C. to obtain phase 1A.

[0062] The raw materials of phase 1B were placed in an oil pan and mixed at 85°C until completely dissolved to obtain phase 1B.

[0063] Step a2: Add phase 1B into an emulsifying pot and mix with phase 1A. Stir homogenously for 8 minutes to obtain phase 1AB.

[0064] Step a3: Cool to 55°C, add the raw materials of phase 1C into the emulsifying pot to mix with phase 1AB, stir evenly to obtain phase 1ABC.

[0065] Step a4: Cool to 45°C, add the raw materials of phase 1D into the emulsifying pot to mix with 1ABC, stir evenly to obtain agent No. 1.

[0066] Step b: preparing dose 2, comprising the following steps: Step b1: put the raw materials of phase 2A into an emulsifying pot and mix them at 85° C. to obtain phase 2A.

[0067] The raw materials of phase 2B were added into an oil pan and mixed at 85°C until they were completely dissolved to obtain phase 2B.

[0068] Step b2: Add phase 2B into an emulsifying pot and mix with phase 2A. Stir homogenously for 8 minutes to obtain phase 2AB.

[0069] Step b3: Cool to 55°C, add the raw materials of phase 2C into the emulsifying pot to mix with phase 2AB, stir evenly to obtain phase 2ABC.

[0070] Step b4: Cool to 45°C, add the raw materials of phase 2D into the emulsifying pot to mix with 2ABC, stir evenly to obtain agent No. 2.

[0071] Step c: Mix agent No. 1 and agent No. 2 until they are uniformly mixed to obtain a low-irritation essential oil hair dye.

[0072] Example 2 A low-irritation essential oil hair dye, which is different from Example 1 in that the contents of the raw materials in Agent 1 are different, as shown in Table 1 for details.

[0073] Example 3 A low-irritation essential oil hair dye, which is different from Example 1 in that Agent 1 does not contain ginseng leaf / stem extract and Polygonum multiflorum extract. See Table 1 for details.

[0074] Table 1 Example 4 A low-irritation essential oil hair dye, which is different from Example 3 in that the contents of the raw materials of Agent 1 are different and the hair colorant is different, as shown in Table 3 for details.

[0075] The contents of the various raw materials in Agent 2 are different, see Table 2 for details.

[0076] The mass ratio of agent No. 1 to agent No. 2 is 1:1.2.

[0077] A method for preparing a low-irritation essential oil hair dye, which is different from Example 3 in that some parameters are different, specifically comprising the following steps: Step a: Preparation of dose 1, comprising the following steps: Step a1: Put the raw materials of phase 1A into an emulsifying pot and mix them at 80° C. to obtain phase 1A.

[0078] The raw materials of phase 1B were placed in an oil pan and mixed at 80°C until they were completely dissolved to obtain phase 1B.

[0079] Step a2: Add phase 1B into an emulsifying pot and mix with phase 1A. Stir homogenously for 10 minutes to obtain phase 1AB.

[0080] Step a3: Cool to 50°C, add the raw materials of phase 1C into the emulsifying pot to mix with phase 1AB, stir evenly to obtain phase 1ABC.

[0081] Step a4: Cool to 40°C, add the raw materials of phase 1D into the emulsifying pot to mix with 1ABC, stir evenly to obtain agent No. 1.

[0082] Step b: preparing dose 2, comprising the following steps: Step b1: Put the raw materials of phase 2A into an emulsifying pot and mix them at 80° C. to obtain phase 2A.

[0083] The raw materials of phase 2B were placed in an oil pan and mixed at 80°C until they were completely dissolved to obtain phase 2B.

[0084] Step b2: Add phase 2B into an emulsifying pot and mix with phase 2A. Stir homogenously for 10 minutes to obtain phase 2AB.

[0085] Step b3: Cool to 50°C, add the raw materials of phase 2C into the emulsifying pot to mix with phase 2AB, stir evenly to obtain phase 2ABC.

[0086] Step b4: Cool to 40°C, add the raw materials of phase 2D into the emulsifying pot to mix with 2ABC, stir evenly to obtain agent No. 2.

[0087] Step c: Mix agent No. 1 and agent No. 2 until they are uniformly mixed to obtain a low-irritation essential oil hair dye.

[0088] Example 5 A low-irritation essential oil hair dye, which is different from Example 3 in that the contents of the raw materials of Agent 1 are different and the hair colorant is different, as shown in Table 3 for details.

[0089] The contents of the various raw materials in Agent 2 are different, see Table 2 for details.

[0090] The mass ratio of agent No. 1 to agent No. 2 is 1:0.8.

[0091] A method for preparing a low-irritation essential oil hair dye, which is different from Example 3 in that some parameters are different, specifically comprising the following steps: Step a: Preparation of dose 1, comprising the following steps: Step a1: Put the raw materials of phase 1A into an emulsifying pot and mix them at 90° C. to obtain phase 1A.

[0092] The raw materials of phase 1B were placed in an oil pan and mixed at 90°C until completely dissolved to obtain phase 1B.

[0093] Step a2: Add phase 1B into an emulsifying pot and mix with phase 1A. Stir homogenously for 5 minutes to obtain phase 1AB.

[0094] Step a3: Cool to 60°C, add the raw materials of phase 1C into the emulsifying pot to mix with phase 1AB, stir evenly to obtain phase 1ABC.

[0095] Step a4: Cool to 50°C, add the raw materials of phase 1D into the emulsifying pot to mix with 1ABC, stir evenly to obtain agent No. 1.

[0096] Step b: preparing dose 2, comprising the following steps: Step b1: Put the raw materials of phase 2A into an emulsifying pot and mix them at 90° C. to obtain phase 2A.

[0097] The raw materials of phase 2B were placed in an oil pan and mixed at 90°C until they were completely dissolved to obtain phase 2B.

[0098] Step b2: Add phase 2B into an emulsifying pot and mix with phase 2A. Stir homogenously for 5 minutes to obtain phase 2AB.

[0099] Step b3: Cool to 60°C, add the raw materials of phase 2C into the emulsifying pot to mix with phase 2AB, stir evenly to obtain phase 2ABC.

[0100] Step b4: Cool to 50°C, add the raw materials of phase 2D into the emulsifying pot to mix with 2ABC, stir evenly to obtain agent No. 2.

[0101] Step c: Mix agent No. 1 and agent No. 2 until they are uniformly mixed to obtain a low-irritation essential oil hair dye.

[0102] Table 2 Table 3 Comparative Example Comparative Example 1 A low-irritation essential oil hair dye, which is different from Example 3 in that the argania spinosa kernel oil is replaced with meadowfoam seed oil.

[0103] Comparative Example 2 A low-irritation essential oil hair dye, which is different from Example 3 in that the camellia extract is replaced by camellia seed oil.

[0104] Comparative Example 3 A low-irritation essential oil hair dye, which is different from Example 3 in that the ginger root extract is replaced by the aloe vera extract.

[0105] Comparative Example 4 A low-irritation essential oil hair dye, which is different from Example 3 in that the argania spinosa kernel oil, camellia extract, and ginger root extract are replaced by water.

[0106] Performance testing 1. Human body detection: 1) Test samples: hair dyes of Examples 1-5 and Comparative Examples 1-4.

[0107] 2) Testing method: 27 volunteers were selected and divided into 9 groups, with 3 people in each group, and each group corresponded to one test sample.

[0108] Clean the volunteer's hair with water, dry it, and evenly apply the test sample to the test area, leave it on for 30 minutes, and then wash off the test sample with clean water.

[0109] The volunteers scored on a scale of 0-10, with the higher the score, the higher the stimulation level, and the lower the score, the lower the stimulation level. The average score of the volunteers in the same group was taken as the test result of the group and recorded in Table 4.

[0110] At the same time, observe whether the volunteers' hair is even after dyeing and record it in Table 4.

[0111] 2. Dyeing effect detection: 1) Test samples: hair dyes of Examples 1-3 and Comparative Examples 1-4.

[0112] 2) Testing method: 35 identical human flat wig bundles (15cm*1.5cm*2.5g, bleached hair bundles) were randomly selected and divided into 7 groups, each group corresponding to 5 hair bundles.

[0113] Each group of hair bundles was dyed with an equal amount of the test sample. After dyeing, the hair bundles were placed in a constant temperature and humidity environment (21°C, 55% RH) for 24 hours. After being taken out, each group of hair bundles was tested using a colorimeter CL 400, and L0, a0, and b0 were recorded.

[0114] Each group of hair bundles was then immersed in 50 mL of 5% (w / v) shampoo solution and placed in a water bath constant temperature oscillator for washing for 2 minutes. The hair bundles were then taken out and rinsed with tap water and then blow-dried.

[0115] The hair tresses were washed repeatedly 30 times, and then each set of hair tresses was tested using a colorimeter CL 400, and L1, a1, and b1 were recorded.

[0116] Use the following formula to calculate the color difference ΔE of each hair strand. The smaller the color difference ΔE, the more durable and better the dyeing effect.

[0117] The average ΔE of the hair tresses in the same group was expressed as the result of the group and recorded in Table 4.

[0118] 3. Detection of hair smoothness after dyeing: 1) Test samples: hair dyes of Examples 1-5 and Comparative Examples 1-4.

[0119] 2) Detection method: 45 identical human flat wig bundles (15cm*1.5cm*2.5g, bleached hair bundles) were randomly selected and divided into 9 groups, each group corresponding to 5 hair bundles.

[0120] Each group of hair bundles was dyed with an equal amount of the test sample. After dyeing, the hair bundles were placed in a constant temperature and humidity environment (21° C., 55% RH) for 24 hours.

[0121] Use XJ810 combing machine to test the friction of dry hair before and after dyeing. Each hair bundle is rubbed 5 times in a cycle and the friction value is recorded.

[0122] Calculate the friction force change rate according to the following formula. The greater the friction force change rate, the better the improvement effect of hair after dyeing and the higher the smoothness.

[0123] The average of the friction force change rates of the hair bundles in the same group is expressed as the result of the group and recorded in Table 4.

[0124] Table 4 Comparative Example 4 is based on Example 3, omitting Argania spinosa kernel oil, Camellia extract, and Ginger root extract, which is equivalent to simulating a commercially available hair dye. According to the test data in Table 4, the hair dyes of Examples 1-5 show lower irritation than Comparative Example 4, and do not affect the dyeing effect at all. On the contrary, the combination of Argania spinosa kernel oil, Camellia extract, and Ginger root extract can also promote the absorption of hair colorants by hair, making the color uniform, not easy to fall off, and more durable. Moreover, the combination of Argania spinosa kernel oil, Camellia extract, and Ginger root extract can also nourish hair, alleviate damage to hair caused by oxidants, etc., and improve the smoothness of dyed hair.

[0125] Comparative Examples 1-3 are hair dyes prepared by omitting any of the Argania spinosa kernel oil, Camellia japonica extract, and Ginger root extract based on Example 3. According to the test data in Table 4, although the hair dyes of Comparative Examples 1-3 are improved in irritation, dyeing effect, and hair quality improvement after dyeing compared with the hair dye of Comparative Example 4, they are still far less effective than Example 3. This is because Argania spinosa kernel oil, Camellia japonica extract, and Ginger root extract are not monomers that work by themselves, but the three have a special coordination effect in the system, so none of the three can be missing.

[0126] Example 1-2 is based on Example 3, and ginseng leaf / stem extract and Polygonum multiflorum extract are further added. According to the test data in Table 4, Example 1-2 has a smaller color difference ΔE and a larger friction force change rate than Example 3. It shows that the use of ginseng leaf / stem extract and Polygonum multiflorum extract can further promote the dyeing effect and improve the hair quality after dyeing.

[0127] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A low-irritation essential oil hair dye, characterized in that: Including agent No. 1 and agent No. 2, the mass ratio of agent No. 1 to agent No. 2 is 1: (0.8-1.2); Agent No. 1, in terms of mass percentage, comprises the following components: Phase 1A: 5-15% moisturizer, 0.2-5% hair colorant, 0.5-1.5% antioxidant, 0.1-0.5% chelating agent A, solvent A; Phase 1B: 8-12% thickener A, 4-13% emulsifier A, 5-20% hair conditioner; Phase 1C: 1-8% pH adjuster A, 0.5-3% polydimethylsiloxane; Phase 1D: 0-1% fragrance A, 0.1-1.5% alcohol solvent A, 0.01-2% chelating agent B, 0.1-3% polyquaternium-7, 0.1-0.5% polyquaternium-10, 0.01-2% argania spinosa kernel oil, 0.01-2% camellia extract, 0.01-2% ginger root extract, 0.01-1% sorbitol, 0.01-1% glucose, 0.01-1% PCA sodium, 0.01-1% glycine, 0.01-1% hexylene glycol, 0.01-1% ethylhexylglycerin, 0.01-1% preservative; Agent No. 2, in terms of mass percentage, comprises the following components: Phase 2A: solvent B, 0.1-1% alcohol solvent B, 0.2-1.5% cetearyl trimethyl ammonium chloride, 0.01-0.2% sodium stannate, 0.1-1% pH adjuster B; Phase 2B: 1.5-5% thickener B, 0.2-1.5% emulsifier B, 0.2-1.5% mineral oil; Phase 2C: 0.2-1.2% chelating agent C; Phase 2D: 1.5-12% oxidant, 0-0.5% aromatic B.

2. The low-irritation essential oil hair dye according to claim 1, characterized in that: According to the mass percentage of the No. 1 agent, the argania spinosa kernel oil is 1.5-2%, the camellia extract is 0.1-0.5%, and the ginger root extract is 0.5-1.5%.

3. The low-irritation essential oil hair dye according to claim 1, characterized in that: The No. 1 agent also includes ginseng leaf / stem extract and Polygonum multiflorum extract.

4. The low-irritation essential oil hair dye according to claim 3, characterized in that: According to the mass percentage of the No. 1 agent, the ginseng leaf / stem extract is 0.01-2%, and the Polygonum multiflorum extract is 0.01-2%.

5. The low-irritation essential oil hair dye according to claim 1, characterized in that: The pH adjuster A includes ethanolamine and ammonium hydroxide.

6. The low-irritation essential oil hair dye according to claim 5, characterized in that: The pH adjuster A is ethanolamine and ammonium hydroxide. According to the mass percentage of agent No. 1, ethanolamine is 0.5-2%, and ammonium hydroxide is 1-3%.

7. The low-irritation essential oil hair dye according to claim 1, characterized in that: The hair coloring agent includes toluene-2,5-diamine sulfate, resorcinol, p-aminophenol, and 2-amino-4-hydroxyethylaminoanisole sulfate.

8. The low-irritation essential oil hair dye according to claim 7, characterized in that: The hair colorant is toluene-2,5-diamine sulfate, resorcinol, p-aminophenol, and 2-amino-4-hydroxyethylaminoanisole sulfate. According to the mass percentage of agent No. 1, toluene-2,5-diamine sulfate is 0.2-1%, resorcinol is 0.1-0.5%, p-aminophenol is 0.3-1%, and 2-amino-4-hydroxyethylaminoanisole sulfate is 0.03-0.1%.

9. A method for preparing a low-irritation essential oil hair dye according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step a: Preparation of dose 1, comprising the following steps: Step a1: Mix the raw materials of phase 1A at 80-90° C. to obtain phase 1A; mix the raw materials of phase 1B at 80-90° C. until they are completely dissolved to obtain phase 1B; Step a2: Mix phase 1A and phase 1B, and stir homogenously for 5-10 minutes to obtain phase 1AB; Step a3: Mix the raw materials of phase 1AB and phase 1C at 50-60° C. and stir evenly to obtain phase 1ABC; Step a4: Stir the raw materials of phases 1ABC and 1D at 40-50°C to obtain agent No. 1; Step b: preparing dose 2, comprising the following steps: Step b1: Mix the raw materials of phase 2A at 80-90° C. to obtain phase 2A; mix the raw materials of phase 2B at 80-90° C. until they are completely dissolved to obtain phase 2B; Step b2: Mix phase 2A and phase 2B, and stir homogenously for 5-10 minutes to obtain phase 2AB; Step b3: Mix the raw materials of the 2AB phase and the 2C phase at 50-60° C. and stir evenly to obtain the 2ABC phase; Step b4: Stir the raw materials of 2ABC phase and 2D phase evenly at 40-50°C to obtain agent No. 2; Step c: Mix agent No. 1 and agent No. 2 until they are uniformly mixed to obtain a low-irritation essential oil hair dye.

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