High-oil repairing ammonia-free low-sensitivity essential oil hair dye and preparation method thereof

Abstract

The present application belongs to the technical field of hair dye, and particularly relates to a high-oil-fat repairing ammonia-free low-sensitivity essential oil hair dye and a preparation method thereof. According to mass percentage, the ammonia-free low-sensitivity essential oil hair dye comprises the following raw materials: ammonia-free low-sensitivity essential oil 32-40%, emulsifier 5-12%, thickening agent 5-10%, hair dye 3-6%, pH regulator 3-5%, humectant 1-3%, antioxidant 0.4-0.8%, essence 0.1-0.5%, chelating agent 0.1-0.3%, keratin 0.05-0.15%, and water to make up the rest to 100%. The ammonia-free low-sensitivity essential oil is a mixture of coconut oil, camellia seed oil, grape seed oil, macadamia seed oil, jojoba seed oil and squalane. The high-oil-fat repairing ammonia-free low-sensitivity essential oil hair dye provided by the present application can simultaneously meet the effects of long-lasting color fixing, repairing performance and storage stability.

Description

Technical Field

[0001] This invention belongs to the field of hair dye technology, specifically relating to a high-oil-repairing, ammonia-free, low-sensitivity essential oil hair dye and its preparation method. Background Technology

[0002] As an important part of the hair care industry, hair dye cosmetics provide consumers with a variety of hair color options.

[0003] Currently, traditional permanent hair dye products (oxidation-reduction type) still dominate the market. These products do not contain regular dyes but instead contain dye intermediates and coupling agents or modifiers, primarily p-phenylenediamine, hydrogen peroxide, and ammonia. Through oxidation, coupling, and condensation reactions, stable dye molecules are formed, which are then trapped within the hair fibers, making them difficult to rinse away and providing a long-lasting color. However, this dyeing process not only damages the keratin structure of the hair, causing dryness, brittleness, breakage, and loss of shine, but also disrupts the scalp barrier system, leading to scalp irritation, itching, and allergic reactions. Therefore, how to avoid scalp irritation and hair damage caused by hair dyes is a pressing issue that needs to be addressed.

[0004] In recent years, oil-based hair dyeing technology has received widespread attention due to its unique repairing properties and dyeing effects. For example, Chinese patent CN119700566A discloses a fast-dyeing, mild hair dye and its preparation method. The hair dye includes agent A and agent B. Agent A includes glycerin, cetearyl alcohol, myristyl alcohol, linseed gum, stevia extract, tea tree oil, fructooligosaccharides, surfactants, oxidative dyes, chelating agents, antioxidants, emulsifiers, oils, hair conditioning agents, fragrances, pH adjusters, and water. Agent B includes cetearyl alcohol, emulsifiers, oils, glycerin, chelating agents, buffers, hydrogen peroxide, stabilizers, and water. This technical solution can shorten the dyeing time, thereby reducing the time the hair dye stays on the scalp and hair, thus reducing irritation and damage to the scalp and head. However, the oil content in this technical solution is not high, and the dyeing time is long when the color fastness is high.

[0005] Chinese patent CN119745749A discloses a natural plant-based hair dye oil, comprising soybean extract, Ganoderma lucidum extract, Astragalus membranaceus extract, Polygonum multiflorum extract, plant oil, erythritol, L-proline, ferulic acid, and γ-aminobutyric acid. It is completely free of phenylenediamines, resorcinol, ammonium hydroxide, and Vaccaria segetalis leaf extract, requiring no additional thickeners, conditioning agents, or alkalizing agents. It offers good hair dyeing results and is safe, reliable, and non-irritating. However, this technology contains a high oil content, and products with high oil content are prone to instability after long-term storage; this technology does not address this issue. Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a high-oil-repairing, ammonia-free, low-allergenic essential oil hair dye and its preparation method. The high-oil-repairing, ammonia-free, low-allergenic essential oil hair dye provided by the present invention can simultaneously satisfy the effects of long-lasting color fixation, repair performance, and storage stability.

[0007] To achieve the above objectives, the first aspect of this invention provides a high-oil-repairing, ammonia-free, hypoallergenic essential oil hair dye, comprising, by weight percentage: 32-40% ammonia-free, hypoallergenic essential oil, 5-12% emulsifier, 5-10% thickener, 3-6% hair dye, 3-5% pH adjuster, 1-3% moisturizer, 0.4-0.8% antioxidant, 0.1-0.5% fragrance, 0.1-0.3% chelating agent, 0.05-0.15% keratin, and water to make up the balance to 100%.

[0008] The ammonia-free, hypoallergenic essential oil is a mixture of coconut oil, camellia seed oil, grape seed oil, macadamia seed oil, jojoba seed oil, and squalane.

[0009] The emulsifier is a mixture of PEG-40 hydrogenated castor oil, dicetyl phosphate, cetyl ether-10 phosphate, and cetearyl glucoside.

[0010] Previous research results of this invention show that the ammonia-free, hypoallergenic essential oil of this invention can not only reduce the direct contact of irritating chemical components with the scalp, but also open the hair cuticle more gently and evenly. As a carrier, it helps dye molecules to enter the cortex more smoothly, resulting in fuller and longer-lasting coloring. However, when its usage in hair dye is 8-10%, its repair effect is relatively poor, and the color fastness also needs to be improved. Based on this, the inventors tried to increase the usage of ammonia-free, hypoallergenic essential oil in hair dye and add keratin. The combination of high-content oil components and keratin, especially the high-content oil components, forms a protective film on the scalp surface, reducing the erosion and damage of hair keratin by alkaline components during the hair dyeing process. Some smaller ammonia-free, hypoallergenic essential oil components penetrate into the hair shaft, filling the gaps between damaged hair cuticles. At the same time, the high-content ammonia-free, hypoallergenic essential oil can also effectively close the hair cuticles during the hair dyeing process, reducing internal structural damage and achieving excellent effects of internal nourishment and external repair.

[0011] However, when the amount of ammonia-free, hypoallergenic essential oil used in hair dye is increased, conventional emulsifiers struggle to emulsify the high content of ammonia-free, hypoallergenic essential oil, leading to instability. In addition, the emulsifier in this invention system also plays a role in ensuring uniform mixing of dyes and oils, thereby improving colorfastness. Through experimental research, the inventors discovered that when the emulsifier is a mixture of PEG-40 hydrogenated castor oil, dicetyl phosphate, cetyl ether-10 phosphate, and cetearyl glucoside, the hair dye not only passed the accelerated stability test (placed at 50℃±2℃ for 12 weeks) but also showed no significant fading after 100 washes.

[0012] Furthermore, the mass ratio of the coconut oil, camellia seed oil, grape seed oil, macadamia seed oil, jojoba seed oil and squalane is 30-38:0.2-0.5:0.1-0.2:0.1-0.2:0.1-0.2:0.1-0.2.

[0013] Furthermore, the mass ratio of the coconut oil, camellia seed oil, grape seed oil, macadamia seed oil, jojoba seed oil, and squalane is 38:0.4:0.15:0.15:0.15:0.15.

[0014] Furthermore, the mass ratio of the PEG-40 hydrogenated castor oil, dicetyl phosphate, cetyl ether-10 phosphate, and cetearyl glucoside is 4-6:1-3:1-2:1-2.

[0015] Furthermore, the mass ratio of the PEG-40 hydrogenated castor oil, dicetyl phosphate, cetyl ether-10 phosphate, and cetearyl glucoside is 5:2:1:2.

[0016] Furthermore, the thickener is cetearyl alcohol.

[0017] Furthermore, the hair dye is selected from at least one of 1-hydroxyethyl-4,5-diaminopyrazole sulfate, 5-amino-6-chloro-o-cresol, 2,4-diaminophenoxyethanol sulfate, 2-amino-3-hydroxypyridine, and m-aminophenol.

[0018] Furthermore, the pH adjuster is ethanolamine.

[0019] Furthermore, the humectant is a mixture of propylene glycol, D-panthenol, and betaine.

[0020] Furthermore, the mass ratio of propylene glycol, D-panthenol, and betaine is 1.5-1.7:1.6-1.8:1.

[0021] Furthermore, the mass ratio of propylene glycol, D-panthenol, and betaine is 1.6:1.7:1.

[0022] Furthermore, the antioxidant is selected from at least one of tocopheryl acetate, ascorbic acid, and sodium sulfite.

[0023] Furthermore, the chelating agent is disodium EDTA.

[0024] A second aspect of this invention provides a method for preparing a high-oil-repairing, ammonia-free, hypoallergenic essential oil hair dye, comprising the following steps:

[0025] (1) Add the emulsifier and thickener to the oil pan, heat and stir until completely dissolved to obtain the oil phase;

[0026] (2) Heat and stir the humectant, cool it, and then put it into the emulsification pot;

[0027] (3) Add water, hair dye, chelating agent and antioxidant into the emulsification pot, heat and stir until completely dissolved;

[0028] (4) Under stirring conditions, the oil phase is added to the emulsification pot and stirring is continued;

[0029] (5) Cool, add ammonia-free hypoallergenic essential oil, pH adjuster, fragrance and keratin, mix, continue stirring, and cool to room temperature to obtain the final product.

[0030] During the experiment, the inventors discovered that when the humectant is a mixture of propylene glycol, D-panthenol, and betaine, and the propylene glycol, D-panthenol, and betaine are heated before being mixed evenly with water, hair dye, chelating agent, and antioxidant during the preparation of hair dye, the color fastness, repair effect, and stability of the hair dye can be effectively improved. This may be because propylene glycol, D-panthenol, and betaine form a eutectic solvent during the heating process, which can improve the uniformity and penetration of the dye, improve emulsification stability, buffer the irritation of the hair dye, and reduce hair fiber damage.

[0031] Furthermore, the heating and stirring temperature in step (1) is 70-80℃.

[0032] Furthermore, the heating and stirring temperature in step (2) is 70-80℃, and the heating and stirring time is 1-3h.

[0033] Furthermore, the heating and stirring temperature in step (3) is 70-80℃.

[0034] Furthermore, the stirring time in step (4) is 10-15 min.

[0035] Furthermore, the temperature after cooling in step (5) is 45°C.

[0036] Furthermore, the stirring time in step (5) is 15-30 minutes.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. This invention utilizes a high-content oil-based formula combined with keratin to successfully resolve the contradiction between damage and effectiveness in traditional hair dyeing products. Through an oil-based system, it achieves controllable opening and closing of hair cuticles, reducing structural damage; it regulates the redox reaction process, improving dyeing efficiency and effectiveness; and it promotes effective cuticle closure, enhancing color longevity and hair shine. Compared to traditional products, it exhibits significant advantages in terms of gentleness, dyeing effect, and hair care benefits, meeting the needs of modern consumers who pursue both health and beauty.

[0039] 2. When the present invention uses a mixture of PEG-40 hydrogenated castor oil, dicetyl phosphate, cetyl ether-10 phosphate and cetearyl glucoside as emulsifier, the hair dye not only passes the accelerated stability test (placed at 50℃±2℃ for 12 weeks), but also shows no obvious fading after 100 washes.

[0040] 3. In this invention, when the moisturizer is a mixture of propylene glycol, D-panthenol and betaine, and during the preparation of the hair dye cream, propylene glycol, D-panthenol and betaine are first heated and then mixed evenly with water, hair dye, chelating agent and antioxidant, the color fastness, repair effect and stability of the hair dye cream can be effectively improved. Attached Figure Description

[0041] Figure 1 These are photographs of the hair dyes used in Examples 1-3 and Comparative Examples 1-7, taken before and after 100 washes following dyeing. Detailed Implementation

[0042] To enable those skilled in the art to more clearly understand the technical solutions described in this invention, the following embodiments are provided for illustration. It should be noted that the following embodiments do not constitute a limitation on the scope of protection claimed by this invention.

[0043] Unless otherwise specified, the raw materials, reagents or apparatus used in the following examples and comparative examples are available from conventional commercial sources or can be obtained by existing known methods.

[0044] Coconut oil: Zhongshan Kemei Oil & Chemical Co., Ltd.;

[0045] Camellia seed oil: Hunan Jinchang Biotechnology Co., Ltd.;

[0046] Grape seed oil: Guangzhou GuCui Biotechnology Co., Ltd.;

[0047] Macadamia seed oil: GUSTAV HEESS GMBH;

[0048] Jojoba seed oil: Guangzhou GuCui Biotechnology Co., Ltd.;

[0049] Squalane: APRINNOVA, LLC;

[0050] Keratin: Nantong Huiqian New Materials Technology Co., Ltd. Example 1

[0051] Example 1 provides a high-oil-repairing, ammonia-free, hypoallergenic essential oil hair dye, comprising the following ingredients by weight percentage: 35% ammonia-free, hypoallergenic essential oil, 6% emulsifier, 6% thickener, 4% hair dye, 3% pH adjuster, 1.5% moisturizer, 0.4% antioxidant, 0.2% fragrance, 0.1% chelating agent, 0.1% keratin, and water to make up to 100%.

[0052] The ammonia-free, hypoallergenic essential oil is a mixture of coconut oil, camellia seed oil, grape seed oil, macadamia seed oil, jojoba seed oil, and squalane in a mass ratio of 34:0.4:0.15:0.15:0.15:0.15.

[0053] The emulsifier is a mixture of PEG-40 hydrogenated castor oil, dicetyl phosphate, cetyl ether-10 phosphate, and cetearyl glucoside in a mass ratio of 5:2:1:2.

[0054] The thickener is cetearyl alcohol.

[0055] The hair dye is a mixture of 1-hydroxyethyl-4,5-diaminopyrazole sulfate, 5-amino-6-chloro-o-cresol, 2,4-diaminophenoxyethanol sulfate, 2-amino-3-hydroxypyridine, and m-aminophenol in a mass ratio of 5.5:1:1:1:1.5.

[0056] The pH adjuster is ethanolamine.

[0057] The humectant is a mixture of propylene glycol, D-panthenol, and betaine in a mass ratio of 1.6:1.7:1.

[0058] The antioxidant is a mixture of tocopheryl acetate, ascorbic acid, and sodium sulfite in a mass ratio of 2:2:1.

[0059] The chelating agent is disodium EDTA.

[0060] The preparation method of the above-mentioned high-oil-repairing, ammonia-free, hypoallergenic essential oil hair dye includes the following steps:

[0061] (1) Add the emulsifier and thickener to the oil pan, heat and stir at 80°C until completely dissolved to obtain the oil phase;

[0062] (2) Heat and stir the humectant at 75°C for 2 hours, cool it, and put it into the emulsification pot;

[0063] (3) Add water, hair dye, chelating agent and antioxidant into an emulsifying pot and heat and stir at 80°C until completely dissolved;

[0064] (4) Under stirring conditions, the oil phase is added to the emulsification pot and stirring is continued for 15 minutes;

[0065] (5) Cool to 45°C, add ammonia-free hypoallergenic essential oil, pH adjuster, fragrance and keratin, mix and continue stirring for 20 minutes, then cool to room temperature to obtain the product. Example 2

[0066] Example 2 provides a high-oil-repairing, ammonia-free, hypoallergenic essential oil hair dye, comprising the following ingredients by weight percentage: 36% ammonia-free, hypoallergenic essential oil, 8% emulsifier, 8% thickener, 5% hair dye, 4% pH adjuster, 2% moisturizer, 0.6% antioxidant, 0.3% fragrance, 0.2% chelating agent, 0.12% keratin, and water to make up to 100%.

[0067] The ammonia-free, hypoallergenic essential oil is a mixture of coconut oil, camellia seed oil, grape seed oil, macadamia seed oil, jojoba seed oil, and squalane in a mass ratio of 35:0.4:0.15:0.15:0.15:0.15.

[0068] The emulsifier is a mixture of PEG-40 hydrogenated castor oil, dicetyl phosphate, cetyl ether-10 phosphate, and cetearyl glucoside in a mass ratio of 5:2:1:2.

[0069] The wheat germ emulsifier is a mixture of cetearyl alcohol / cetearyl glucoside.

[0070] The thickener is cetearyl alcohol.

[0071] The hair dye is a mixture of 1-hydroxyethyl-4,5-diaminopyrazole sulfate, 5-amino-6-chloro-o-cresol, 2,4-diaminophenoxyethanol sulfate, 2-amino-3-hydroxypyridine, and m-aminophenol in a mass ratio of 5.5:1:1:1:1.5.

[0072] The pH adjuster is ethanolamine.

[0073] The humectant is a mixture of propylene glycol, D-panthenol, and betaine in a mass ratio of 1.6:1.7:1.

[0074] The antioxidant is a mixture of tocopheryl acetate, ascorbic acid, and sodium sulfite in a mass ratio of 2:2:1.

[0075] The chelating agent is disodium EDTA.

[0076] The preparation method of the above-mentioned high-oil-repairing, ammonia-free, hypoallergenic essential oil hair dye includes the following steps:

[0077] (1) Add the emulsifier and thickener to the oil pan, heat and stir at 80°C until completely dissolved to obtain the oil phase;

[0078] (2) Heat and stir the humectant at 75°C for 2 hours, cool it, and put it into the emulsification pot;

[0079] (3) Add water, hair dye, chelating agent and antioxidant into an emulsifying pot and heat and stir at 80°C until completely dissolved;

[0080] (4) Under stirring conditions, the oil phase is added to the emulsification pot and stirring is continued for 15 minutes;

[0081] (5) Cool to 45°C, add ammonia-free hypoallergenic essential oil, pH adjuster, fragrance and keratin, mix and continue stirring for 20 minutes, then cool to room temperature to obtain the product. Example 3

[0082] Example 3 provides a high-oil-repairing, ammonia-free, hypoallergenic essential oil hair dye, comprising the following ingredients by weight percentage: 38% ammonia-free, hypoallergenic essential oil, 10% emulsifier, 8% thickener, 6% hair dye, 5% pH adjuster, 2% moisturizer, 0.6% antioxidant, 0.4% fragrance, 0.3% chelating agent, 0.15% keratin, and water to make up to 100%.

[0083] The ammonia-free, hypoallergenic essential oil is a mixture of coconut oil, camellia seed oil, grape seed oil, macadamia seed oil, jojoba seed oil, and squalane in a mass ratio of 37:0.4:0.15:0.15:0.15:0.15.

[0084] The emulsifier is a mixture of PEG-40 hydrogenated castor oil, dicetyl phosphate, cetyl ether-10 phosphate, and cetearyl glucoside in a mass ratio of 5:2:1:2.

[0085] The thickener is cetearyl alcohol.

[0086] The hair dye is a mixture of 1-hydroxyethyl-4,5-diaminopyrazole sulfate, 5-amino-6-chloro-o-cresol, 2,4-diaminophenoxyethanol sulfate, 2-amino-3-hydroxypyridine, and m-aminophenol in a mass ratio of 5.5:1:1:1:1.5.

[0087] The pH adjuster is ethanolamine.

[0088] The humectant is a mixture of propylene glycol, D-panthenol, and betaine in a mass ratio of 1.6:1.7:1.

[0089] The antioxidant is a mixture of tocopheryl acetate, ascorbic acid, and sodium sulfite in a mass ratio of 2:2:1.

[0090] The chelating agent is disodium EDTA.

[0091] The preparation method of the above-mentioned high-oil-repairing, ammonia-free, hypoallergenic essential oil hair dye includes the following steps:

[0092] (1) Add the emulsifier and thickener to the oil pan, heat and stir at 80°C until completely dissolved to obtain the oil phase;

[0093] (2) Heat and stir the humectant at 75°C for 2 hours, cool it, and put it into the emulsification pot;

[0094] (3) Add water, hair dye, chelating agent and antioxidant into an emulsifying pot and heat and stir at 80°C until completely dissolved;

[0095] (4) Under stirring conditions, the oil phase is added to the emulsification pot and stirring is continued for 15 minutes;

[0096] (5) Cool to 45°C, add ammonia-free hypoallergenic essential oil, pH adjuster, fragrance and keratin, mix and continue stirring for 20 minutes, then cool to room temperature to obtain the product.

[0097] Comparative Example 1

[0098] Comparative Example 1 provides a high-oil-repairing, ammonia-free, hypoallergenic essential oil hair dye, which differs from Example 3 only in that the emulsifier is a mixture of PEG-40 hydrogenated castor oil, dicetyl phosphate, and cetyl polyether-10 phosphate in a mass ratio of 5:2:3; all other aspects are the same.

[0099] Comparative Example 2

[0100] Comparative Example 2 provides a high-oil-repairing, ammonia-free, hypoallergenic essential oil hair dye, which differs from Example 3 only in that the emulsifier is a mixture of PEG-40 hydrogenated castor oil and cetearyl glucoside in a mass ratio of 5:5; all other aspects are the same.

[0101] Comparative Example 3

[0102] Comparative Example 3 provides a high-oil-repairing, ammonia-free, hypoallergenic essential oil hair dye, which differs from Example 3 only in that dicetyl phosphate, cetyl polyether-10 phosphate, and cetearyl glucoside are replaced with an equal mass of cetearyl polyether-25; all other aspects are the same.

[0103] Comparative Example 4

[0104] Comparative Example 4 provides a high-oil-repairing, ammonia-free, hypoallergenic essential oil hair dye, which differs from Example 3 only in that PEG-40 hydrogenated castor oil is replaced with an equal mass of PEG-100 stearate; all other aspects are the same.

[0105] Comparative Example 5

[0106] Comparative Example 5 provides a high-oil-repairing ammonia-free, hypoallergenic essential oil hair dye, which differs from Example 3 only in that, by weight percentage, the high-oil-repairing ammonia-free, hypoallergenic essential oil hair dye comprises the following ingredients: 9.55% ammonia-free, hypoallergenic essential oil, 2.5% emulsifier, 8% thickener, 2.5% hair dye, 5% pH adjuster, 2.5% moisturizer, 0.8% antioxidant, 0.5% fragrance, 0.2% chelating agent, 0.12% keratin, and water to make up the balance to 100%; the ammonia-free, hypoallergenic essential oil is a mixture of jojoba seed oil, camellia seed oil, grape seed oil, macadamia seed oil, coconut oil, and squalane in a weight ratio of 90:1.1:1.1:1.1:1.1:1.1; all other components are the same.

[0107] Comparative Example 6

[0108] Comparative Example 6 provides a high-oil-repairing, ammonia-free, hypoallergenic essential oil hair dye, which differs from Example 3 only in that the moisturizer is a mixture of propylene glycol and betaine in a mass ratio of 3.3:1; all other aspects are the same.

[0109] Comparative Example 7

[0110] Comparative Example 7 provides a high-oil-repairing, ammonia-free, hypoallergenic essential oil hair dye, which differs from Example 3 only in that the preparation method of the high-oil-repairing, ammonia-free, hypoallergenic essential oil hair dye includes the following steps:

[0111] (1) Add the emulsifier and thickener to the oil pan, heat and stir at 80°C until completely dissolved to obtain the oil phase;

[0112] (2) Add water, moisturizer, hair dye, chelating agent and antioxidant into an emulsifying pot and heat and stir at 80°C until completely dissolved;

[0113] (3) Under stirring conditions, the oil phase is added to the emulsification pot and stirring is continued for 15 minutes;

[0114] (4) Cool to 45°C, add ammonia-free hypoallergenic essential oil, pH adjuster, fragrance and keratin, mix, continue stirring for 20 minutes, and cool to room temperature to obtain the product; the rest are the same.

[0115] Performance testing:

[0116] The hair dye and developer from Examples 1-3 and Comparative Examples 1-7 were mixed evenly at a mass ratio of 1:1 and then applied to three bundles of level 3 human flat wigs.

[0117] The color developing emulsion comprises, by weight percentage: 6% hydrogen peroxide, 3% cetearyl alcohol, 1.3% cetearyl alcohol polyether-25, 1.2% glyceryl stearate, 0.15% hydroxyethyl diphosphate, 0.15% xanthan gum, 0.15% disodium hydrogen phosphate, 0.1% sodium stannate, and water to make up to 100%.

[0118] The method for preparing the color-developing emulsion includes the following steps:

[0119] Cetearyl alcohol, cetearyl alcohol polyether-25, and glyceryl stearate were added to an oil pan and stirred at 80°C until completely dissolved to obtain the oil phase.

[0120] Hydrogen peroxide and water are mixed in a mass ratio of 1:2 to obtain an aqueous solution of hydrogen peroxide;

[0121] Hydroxyethylene diphosphate and water were mixed at a mass ratio of 1.5:1 to obtain an aqueous solution of hydroxyethylene diphosphate.

[0122] Add disodium hydrogen phosphate, sodium stannate, xanthan gum and remaining water to an emulsifying pot, mix, heat to 80°C, add the oil phase while stirring, and stir for 15 minutes.

[0123] Cool to 55°C, add aqueous solution of hydroxyethyl diphosphate, mix, and stir until homogeneous;

[0124] Cool to 40°C, add hydrogen peroxide aqueous solution, mix, stir evenly, and cool to room temperature to obtain the final product.

[0125] 1. Colorfastness:

[0126] A mixture of hair dye and developer, equal to 1.5 times the weight of the human flat hair wig, was evenly applied to the wig. It was left to stand at room temperature (25℃) for 30 minutes, then rinsed clean, blow-dried, and then placed under constant temperature and humidity (25℃, 55%RH) conditions for 24 hours. Next, the wig was immersed in 1000mL of shampoo (5% concentration), shaken and washed for 5 minutes, rinsed clean with water, and blow-dried. This process was repeated 100 times, and the results are shown in Table 1 below. Photos of the wig before and after 100 washes are also shown. Figure 1 As shown.

[0127] 2. Repair effect

[0128] The tensile strength of the hair strands before and after dyeing was tested according to T / GDCDC 012-2020. The change rate of tensile strength was calculated. The formula is: change rate of tensile strength = {(tensile strength before dyeing - tensile strength after dyeing) / tensile strength before dyeing} * 100%. The smaller the change rate of tensile strength, the better the repair effect. The results are shown in Table 1 below.

[0129] 3. Accelerate stability

[0130] The hair dye was placed at 50℃±2℃ for 12 weeks and observed for any signs of deterioration such as turbidity or layering. If any deterioration was observed, it was considered unqualified. The results are shown in Table 1 below.

[0131] Table 1

[0132]

[0133] As shown in Table 1, the hair dyes of Examples 1-3 have excellent dyeing durability, repair properties and stability.

[0134] The composition of the emulsifier changed in Comparative Examples 1-4, and the repair performance of the resulting hair dyes did not change much, but the dyeing durability and stability were poor.

[0135] In Comparative Example 5, the amount of ammonia-free and hypoallergenic essential oil used was relatively small, and the resulting hair dye was stable, but its dyeing durability and repair performance were poor.

[0136] The composition of the moisturizer in Comparative Example 6 was changed, and the resulting hair dye had good dyeing durability, but poor dyeing repair performance and stability.

[0137] The preparation method of Comparative Example 7 was changed, and the resulting hair dye had poor dyeing durability, dyeing repair performance and stability.

[0138] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A high-oil-repairing, ammonia-free, hypoallergenic essential oil hair dye, characterized in that, By weight percentage, it includes the following raw materials: Ammonia-free, hypoallergenic essential oils 32-40%, emulsifiers 5-12%, thickeners 5-10%, hair dyes 3-6%, pH adjusters 3-5%, moisturizers 1-3%, antioxidants 0.4-0.8%, fragrances 0.1-0.5%, chelating agents 0.1-0.3%, keratin 0.05-0.15%, water to 100%; The ammonia-free, hypoallergenic essential oil is a mixture of coconut oil, camellia seed oil, grape seed oil, macadamia seed oil, jojoba seed oil, and squalane in a mass ratio of 30-38:0.2-0.5:0.1-0.2:0.1-0.2:0.1-0.2:0.1-0.

2. The emulsifier is a mixture of PEG-40 hydrogenated castor oil, dicetyl phosphate, cetyl ether-10 phosphate, and cetearyl glucoside in a mass ratio of 4-6:1-3:1-2:1-2. The humectant is a mixture of propylene glycol, D-panthenol, and betaine; In the preparation of hair dye, propylene glycol, D-panthenol and betaine are first heated and then mixed evenly with water, hair dye, chelating agent and antioxidant. The heating temperature is 70-80℃ and the heating time is 1-3h.

2. The high-oil-repairing, ammonia-free, low-allergy essential oil hair dye according to claim 1, characterized in that, The mass ratio of the PEG-40 hydrogenated castor oil, dicetyl phosphate, cetyl ether-10 phosphate, and cetearyl glucoside is 5:2:1:

2.

3. The high-oil-repairing, ammonia-free, low-allergy essential oil hair dye cream according to claim 1, characterized in that, The thickener is cetearyl alcohol.

4. The high-oil-repairing, ammonia-free, low-allergy essential oil hair dye according to claim 1, characterized in that, The hair dye is selected from at least one of 1-hydroxyethyl-4,5-diaminopyrazole sulfate, 5-amino-6-chloro-o-cresol, 2,4-diaminophenoxyethanol sulfate, 2-amino-3-hydroxypyridine, and m-aminophenol.

5. The high-oil-repairing, ammonia-free, low-allergenic essential oil hair dye according to claim 1, characterized in that, The mass ratio of propylene glycol, D-panthenol, and betaine is 1.5-1.7:1.6-1.8:

1.

6. The method for preparing the high-oil-repairing, ammonia-free, low-sensitivity essential oil hair dye according to any one of claims 1-5, characterized in that, Includes the following steps: (1) Add the emulsifier and thickener to the oil pan, heat and stir until completely dissolved to obtain the oil phase; (2) Heat and stir the humectant, cool it, and then put it into the emulsification pot; (3) Add water, hair dye, chelating agent and antioxidant into the emulsification pot, heat and stir until completely dissolved; (4) Under stirring conditions, the oil phase is added to the emulsification pot and stirring is continued; (5) Cool, add ammonia-free hypoallergenic essential oil, pH adjuster, fragrance and keratin, mix, continue stirring, and cool to room temperature to obtain the final product.

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