Plant conditioning type hair dye and preparation method thereof

Abstract

The invention relates to a plant conditioning type hair dye and a preparation method thereof, and the plant conditioning type hair dye comprises the following components in percentage by weight: 1.5-2.5% of a conditioner, 2.5-2.9% of a coloring agent, 4.5-6% of a humectant, 3.8-4.3% of an alkaline agent, 1.4-1.7% of a solubilizer, 1-1.4% of a thickening agent, 0.1-0.5% of a preservative and the balance of deionized water. Protein hydrolysate, flaxseed extract, polygonum multiflorum root extract, gallnut extract, aloe barbadensis leaf extract, angelica root extract, ginseng root extract and fenugreek fruit extract are used as conditioners, and the conditioners and other components are mixed to prepare the plant conditioning type hair dye, so that the binding strength of the dyeing agent and hair can be improved; the dyeing effect of the hair dye is better, and the damage of the hair dye to hair and hair is reduced.

Description

Technical Field

[0001] This invention relates to the field of cosmetic technology, specifically to a plant-based conditioning hair dye and its preparation method. Background Technology

[0002] Traditional hair dyes work by using alkali and oxidizing agents to fade the melanin in the hair, making the hair color lighter. The alkali in the dye opens the hair cuticle, allowing the dye components to penetrate the cuticle layer. Under the combined action of the alkali and oxidizing agents, the dye components react to form colored macromolecules, giving the hair its color. Different colors can be achieved by adjusting the types and amounts of dye components. However, the chemical components in hair dyes may irritate the hair, causing damage and leading to adverse effects such as hair loss, dryness, and split ends. Summary of the Invention

[0003] In view of this, a plant-based conditioning hair dye and its preparation method are provided to solve the above problems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] In a first aspect, the present invention provides a plant-based conditioning hair dye, which, by weight percentage, comprises 1.5-2.5% conditioning agent, 2.5-2.9% dyeing agent, 4.5-6% moisturizing agent, 3.8-4.3% alkaline agent, 1.4-1.7% solubilizer, 1-1.4% thickener, 0.1-0.5% preservative, and the balance being deionized water;

[0006] By weight, the conditioning agent comprises 0.4-0.7 parts hydrolyzed protein, 1.8-2.2 parts flaxseed extract, 0.08-0.12 parts Polygonum multiflorum root extract, 0.3-0.7 parts Gallnut extract, 0.08-0.12 parts Aloe vera leaf extract, 0.08-0.12 parts Angelica sinensis root extract, 0.08-0.12 parts ginseng root extract, and 1-1.4 parts fenugreek fruit extract.

[0007] Further, by weight, the dyeing agent comprises p-phenylenediamine, 2,4-diaminophenoxyethanol hydrochloride, resorcinol and phenylmethylpyrazolone in a mass ratio of 1.5-1.8:0.5-0.6:0.4-0.5:0.03-0.05.

[0008] Furthermore, the thickener is carbomer.

[0009] Furthermore, the humectant comprises propylene glycol and maltodextrin in a mass ratio of 2:0.1-0.2.

[0010] Furthermore, the alkaline agent is ethanolamine.

[0011] Furthermore, the solubilizer comprises octylphenol polyether-10, magnesium aluminum silicate, and PEG-40 hydrogenated castor oil in a mass ratio of 2:0.7-0.8:0.1-0.2.

[0012] Further, by weight, the preservative comprises phenoxyethanol, ethylhexylglycerin, potassium sorbate and citric acid in a mass ratio of 3-5:1.5-2.5:1-1.2:0.5-0.8.

[0013] Furthermore, the preparation method of the fenugreek fruit extract includes the following steps:

[0014] (1) Prepare an extraction solvent by mixing deionized water and a eutectic solvent in a mass ratio of 1:1.5-1.7;

[0015] (2) Dry, crush, and sieve the fenugreek fruit to obtain powder;

[0016] (3) Mix the powder and extraction solvent, extract by ultrasonication, filter, and dry to obtain fenugreek fruit extract.

[0017] Furthermore, in step (1), the eutectic solvent is choline chloride, sodium subtilisin and urea in a mass ratio of 1:0.1-0.2:0.8-0.9.

[0018] Furthermore, in step (3), the ultrasonic extraction is performed at 35-45℃ and 250-270W for 35-45 minutes.

[0019] Furthermore, in step (3), the ratio of the powder to the extraction solvent is 1g:10-20mL.

[0020] Secondly, the present invention provides a method for preparing the plant-based conditioning hair dye described in the first aspect, comprising the following steps:

[0021] S1: Mix 50-60 wt% of deionized water with a humectant and an alkaline agent to obtain phase A;

[0022] S2: Mix the remaining deionized water and thickener and add them to phase A. Adjust the temperature to 40-45℃, add the dye and mix to obtain phase B.

[0023] S3: Add the remaining raw materials to phase B and mix to obtain the finished product.

[0024] Further, in step S1, the mixing is carried out by stirring and mixing at 80-85°C and 200-250 r / min for 15-25 min.

[0025] Further, in step S2, the mixing of the remaining deionized water and thickener is as follows: after mixing the remaining deionized water and thickener, let it stand for 10-14 hours, and then homogenize it at 20000-30000 rpm for 5-10 minutes.

[0026] Further, in step S2, the mixing is carried out by stirring at 100-130 r / min for 8-10 min.

[0027] Further, in step S3, the mixing is carried out by stirring at 100-130 r / min for 20-25 min.

[0028] In this invention:

[0029] Hydrolyzed protein: It can penetrate the hair core, fill the gaps in damaged keratin, enhance the toughness and elasticity of hair, and reduce breakage; it forms a water-locking protective film to resist heat and chemical damage, repair hair cuticles, improve shine and smoothness, and provide long-lasting hydration to prevent dry hair.

[0030] Flaxseed extract: Flaxseed is rich in active ingredients such as alpha-linolenic acid, lignans SDG, dietary fiber, flaxseed protein and polyphenols, which have antioxidant, anti-inflammatory, moisturizing and barrier-repairing effects.

[0031] Polygonum multiflorum root extract: Polygonum multiflorum root contains stilbene glycosides, lecithin, polysaccharides and trace elements as its core components, which have the effects of anti-oxidation, promoting melanin synthesis, repairing hair follicles and enhancing keratin cross-linking.

[0032] Gallnut extract: Gallnut is rich in tannic acid, gallic acid, ellagic acid and polyphenols, and has strong astringent, antioxidant, antibacterial and anti-inflammatory effects.

[0033] Aloe vera leaf extract: Aloe vera leaves are rich in active ingredients such as polysaccharides, aloin, amino acids, organic acids, and phytosterols, and have moisturizing, antibacterial, and antioxidant effects.

[0034] Angelica root extract: Angelica root is rich in active ingredients such as ferulic acid, ligustilide, volatile oil, polysaccharides and vitamin B12, which have anti-inflammatory, antioxidant, circulation-promoting and barrier-repairing effects.

[0035] Ginseng root extract: Ginseng root is rich in active ingredients such as ginsenosides, polysaccharides, and volatile oils, which have antioxidant, microcirculation-promoting, and hair follicle barrier-repairing effects.

[0036] Fenugreek fruit extract: Fenugreek fruit is rich in steroidal saponins, flavonoids, alkaloids, 4-hydroxyisoleucine, polysaccharides and volatile oils, which have antioxidant, moisturizing and antibacterial effects.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] In this invention, hydrolyzed protein, flaxseed extract, Polygonum multiflorum root extract, Gallnut extract, Aloe vera leaf extract, Angelica sinensis root extract, ginseng root extract, and fenugreek fruit extract are used as conditioning agents in the hair dye. Since each conditioning agent is rich in multiple active ingredients, and these active ingredients have synergistic effects, the hair dye of this invention can inhibit the generation of inflammatory mediators and free radicals, reducing scalp stinging and itching. Simultaneously, it promotes epidermal cholesterol secretion and repairs the lipid barrier after chemical damage, keeping the scalp in a low-irritation, low-redness state throughout the hair dyeing process. More importantly, it can shorten the dyeing time, preventing damage to the hair caused by the chemical components in the hair dye due to excessively long dyeing time.

[0039] In this invention, fenugreek fruit extract is obtained using a eutectic solvent extraction method. Choline chloride and sodium subtilis lipopeptide are selected as hydrogen bond acceptors in the eutectic solvent, and urea is used as a hydrogen bond donor. This method can improve the extraction yield of effective components such as flavonoids and saponins from fenugreek fruit. Since saponins, flavonoids, and other active components contain multiple active hydroxyl groups, they can bind to keratin in hair, increasing the binding strength of the dye to the hair and the dyeing rate of penetration into the hair medulla, resulting in better hair dyeing effects.

[0040] This invention uses p-phenylenediamine, 2,4-diaminophenoxyethanol hydrochloride, resorcinol, and phenylmethylpyrazolone as dyeing agents, wherein resorcinol and phenylmethylpyrazolone serve as coupling agents, and p-phenylenediamine and 2,4-diaminophenoxyethanol hydrochloride serve as dye intermediates. The components in the dyeing agent are rationally combined and can be oxidized in air to produce a color-developing reaction. The rationally proportioned components in the hair dye of this invention give the hair dye advantages such as moisturizing, good dyeing effect, and reduced damage to the hair cuticle. Detailed Implementation

[0041] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0042] To further illustrate the present invention, detailed descriptions are provided below through the following embodiments. The raw materials used in the following embodiments and comparative examples of the present invention are all commercially available products; the raw material companies listed below represent one of the ways to purchase the raw materials.

[0043] Hydrolyzed protein was purchased from TRI-K.

[0044] Flaxseed extract was purchased from Xianyang Saishuo Biotechnology Co., Ltd.

[0045] The root extract of Polygonum multiflorum, gallnut extract, aloe vera leaf extract, angelica root extract, and ginseng root extract were all purchased from Haozhou Xier Traditional Chinese Medicine Co., Ltd.

[0046] Preparation of Fenugreek Fruit Extract 1

[0047] Includes the following steps:

[0048] (1) Deionized water and eutectic solvent in a mass ratio of 1:1.5 are mixed to prepare an extraction solvent; wherein the eutectic solvent is choline chloride, sodium subtilisin and urea in a mass ratio of 1:0.1:0.8.

[0049] (2) Dry the fenugreek fruit, crush it, and pass it through a 100-mesh sieve to obtain powder;

[0050] (3) Mix the powder and extraction solvent at a ratio of 1g:10mL, and extract by ultrasonication at 35℃ and 250W for 45min. Filter and dry to obtain fenugreek fruit extract.

[0051] Preparation of Fenugreek Fruit Extract 2

[0052] Includes the following steps:

[0053] (1) Deionized water and eutectic solvent in a mass ratio of 1:1.7 are mixed to prepare an extraction solvent; wherein the eutectic solvent is choline chloride, sodium subtilisin and urea in a mass ratio of 1:0.2:0.9.

[0054] (2) Dry the fenugreek fruit, crush it, and pass it through a 100-mesh sieve to obtain powder;

[0055] (3) Mix the powder and extraction solvent at a ratio of 1g:20mL, and extract by ultrasonication at 45℃ and 270W for 35min. Filter and dry to obtain fenugreek fruit extract.

[0056] Preparation of Fenugreek Fruit Extract 3

[0057] Includes the following steps:

[0058] (1) Deionized water and eutectic solvent in a mass ratio of 1:1.6 are mixed to prepare an extraction solvent; wherein the eutectic solvent is choline chloride, sodium subtilisin and urea in a mass ratio of 1:0.12:0.85.

[0059] (2) Dry the fenugreek fruit, crush it, and pass it through a 100-mesh sieve to obtain powder;

[0060] (3) Mix the powder and extraction solvent at a ratio of 1g:15mL, and extract by ultrasonication at 40℃ and 260W for 40min. Filter and dry to obtain fenugreek fruit extract.

[0061] Preparation of Fenugreek Fruit Extract 4

[0062] The preparation of fenugreek fruit extract 4 differs from that of fenugreek fruit extract 3 in that the eutectic solvent used in fenugreek fruit extract 4 is choline chloride and urea in a mass ratio of 1.12:0.85; the remaining preparation steps and process parameters are the same as those for fenugreek fruit extract 3.

[0063] Preparation of Fenugreek Fruit Extract 5

[0064] The preparation of fenugreek fruit extract 3 differs from that of fenugreek fruit extract 5 in that the eutectic solvent used in fenugreek fruit extract 5 is sodium subtilis lipopeptide and urea in a mass ratio of 1.12:0.85; the remaining preparation steps and process parameters are the same as those for fenugreek fruit extract 3.

[0065] Preparation of Fenugreek Fruit Extract 6

[0066] The preparation of fenugreek fruit extract 3 differs from that of fenugreek fruit extract 6 in that the eutectic solvent used in fenugreek fruit extract 6 is choline chloride, sodium subtilis lipopeptide and urea in a mass ratio of 0.12:1:0.85; the remaining preparation steps and process parameters are the same as those for fenugreek fruit extract 3.

[0067] Preparation of Fenugreek Fruit Extract 7

[0068] The preparation of fenugreek fruit extract 3 differs from that of fenugreek fruit extract 3 in that the eutectic solvent is choline chloride, sodium subtilis lipopeptide and ethylene glycol in a mass ratio of 1:0.12:0.85; the remaining preparation steps and process parameters are the same as those of fenugreek fruit extract 3.

[0069] Composition of conditioning agent

[0070] Conditioner 1: By weight, the conditioner comprises 0.5 parts hydrolyzed protein, 2 parts flaxseed extract, 0.1 parts Polygonum multiflorum root extract, 0.5 parts Gallnut extract, 0.1 parts Aloe vera leaf extract, 0.1 parts Angelica sinensis root extract, 0.1 parts ginseng root extract and 1.2 parts fenugreek fruit extract 3.

[0071] Conditioner 2: By weight, the conditioner comprises 0.4 parts hydrolyzed protein, 1.8 parts flaxseed extract, 0.08 parts Polygonum multiflorum root extract, 0.3 parts Gallnut extract, 0.08 parts Aloe vera leaf extract, 0.12 parts Angelica sinensis root extract, 0.12 parts ginseng root extract and 1 part fenugreek fruit extract.

[0072] Conditioner 3: By weight, the conditioner comprises 0.7 parts hydrolyzed protein, 2.2 parts flaxseed extract, 0.12 parts Polygonum multiflorum root extract, 0.7 parts Gallnut extract, 0.12 parts Aloe vera leaf extract, 0.08 parts Angelica sinensis root extract, 0.08 parts ginseng root extract and 1.4 parts fenugreek fruit extract 2.

[0073] Conditioner 4: Unlike Conditioner 1, Fenugreek fruit extract 4 is used instead of Fenugreek fruit extract 3.

[0074] Conditioner 5: Unlike Conditioner 1, Fenugreek fruit extract 5 is used instead of Fenugreek fruit extract 3.

[0075] Conditioner 6: Unlike Conditioner 1, Fenugreek fruit extract 6 is used instead of Fenugreek fruit extract 3.

[0076] Conditioner 7: Unlike Conditioner 1, Fenugreek fruit extract 7 is used instead of Fenugreek fruit extract 3.

[0077] Compared to Conditioner 1: Conditioner 1 is missing flaxseed extract, gallnut extract and fenugreek fruit extract 3. The missing amounts are made up by hydrolyzed protein, Polygonum multiflorum root extract, Aloe vera leaf extract, Angelica sinensis root extract and ginseng root extract in a mass ratio of 0.5:0.1:0.1:0.1:0.1.

[0078] Comparison Conditioner 2: Based on Conditioner 1, it lacks hydrolyzed protein, Polygonum multiflorum root extract, Aloe vera leaf extract, Angelica sinensis root extract, and ginseng root extract. The missing amounts are made up by flaxseed extract, gallnut extract, and fenugreek fruit extract in a mass ratio of 2:0.5:1.2.

[0079] Comparison Conditioner 3: Based on Conditioner 1, it lacks flaxseed extract, and the missing amount is made up by gallnut extract and fenugreek fruit extract in a mass ratio of 0.5:1.2.

[0080] Comparative Conditioner 4: Based on Conditioner 1, it lacks gallnut extract, and the missing amount is made up by flaxseed extract and fenugreek fruit extract in a mass ratio of 2:1.2.

[0081] Comparison Conditioner 5: Based on Conditioner 1, it lacks Fenugreek fruit extract 3, and the missing amount is made up by flaxseed extract and gallnut extract in a mass ratio of 2:0.5.

[0082] Preparation method of plant-based conditioning hair dye

[0083] By weight percentage, the plant-based conditioning hair dye comprises 2% conditioning agent, 2.7% dyeing agent, 5.5% moisturizing agent, 4% alkaline agent, 1.5% solubilizer, 1.2% thickener, 0.3% preservative and the balance being deionized water;

[0084] The hair dye is p-phenylenediamine, 2,4-diaminophenoxyethanol hydrochloride, resorcinol and phenylmethylpyrazolone in a mass ratio of 1.6:0.55:0.45:0.04.

[0085] The thickener is carbomer;

[0086] The humectant is propylene glycol and maltodextrin in a mass ratio of 2:0.15;

[0087] The alkaline agent is ethanolamine;

[0088] The solubilizer comprises octylphenol polyether-10, magnesium aluminum silicate, and PEG-40 hydrogenated castor oil in a mass ratio of 2:0.75:0.15.

[0089] The preservative comprises phenoxyethanol, ethylhexylglycerin, potassium sorbate, and citric acid in a mass ratio of 4:2:1.1:0.6.

[0090] The preparation method of the plant-based conditioning hair dye includes the following steps:

[0091] S1: Deionized water accounting for 55wt% of the total deionized water is mixed with humectant and alkaline agent at 83℃ and 230r / min for 20min to obtain phase A;

[0092] S2: Mix the remaining deionized water and thickener and let stand for 12 hours. Then homogenize at 25,000 rpm for 10 minutes. Add the mixture to phase A, adjust the temperature to 45°C, add the dyeing agent, and stir at 120 rpm for 10 minutes to obtain phase B.

[0093] S3: Add the remaining raw materials to phase B and stir and mix at 120 r / min for 25 min to obtain the plant-based conditioning hair dye.

[0094] Experimental Example 1

[0095] Plant-based conditioning hair dyes were prepared by the above-described method for preparing plant-based conditioning hair dyes, using conditioning agents 1, 4-7, and comparative conditioning agents 1-5 respectively. These were designated as Application Example 1, Application Example 4-7, and Comparative Application Example 1-5, respectively. The hair dyeing effect and color-fixing performance of Application Example 1, Application Example 4-7, and Comparative Application Example 1-5 were then tested.

[0096] Healthy white hair, 30cm in length and 50g in weight, with a brightness value (L) of approximately 65, was collected and used to prepare sample hair bundles. Three sample hair bundles were prepared for each application example. 60g of plant-based conditioning hair dye was evenly applied to the surface of the sample hair bundle, and the mixture was heated to 45℃ for 15 minutes. After heat treatment, the sample hair bundles were rinsed with water to obtain the dyed sample hair bundles. The hair dyeing effect was evaluated as satisfactory. The PRO ultra-high precision professional spectrophotometer measures the change in hair brightness value L under a D65 light source. Hair brightness value L represents the depth of color; a higher L value indicates lighter hair, and a lower L value indicates darker hair. Generally, L ≤ 16 is considered black, L ≥ 60 is considered white, and L between 16 and 60 is considered grayish-white.

[0097] Coloring effect (ΔL value) = L 染发前 -L 染发后

[0098] Determination of color fixation properties of dyed hair strands:

[0099] The number of washes required to detect the first fading of the dyed hair sample after multiple washes with shampoo was recorded. The dyed hair sample was immersed in an aqueous solution containing 10% shampoo, and each wash was performed at 30 rpm for 5 minutes.

[0100] Table 1. Test results of hair dyeing effect and color-fixing performance of plant-based conditioning hair dye.

[0101] Group Coloring effect (ΔL value) Number of times it fades after washing Application Example 1 61.2 145 Application Example 4 59.8 140 Application Example 5 56.9 128 Application Example 6 57.7 132 Application Example 7 56.1 135 Comparative Application Example 1 18.6 54 Comparative Application Example 2 35.4 79 Comparative Application Example 3 53.6 113 Comparative Application Example 4 46.3 94 Comparative Application Example 5 42.7 102

[0102] Experimental results show that the use of choline chloride, sodium subtilis lipopeptide, and urea as eutectic solvents in the preparation of fenugreek fruit extract demonstrates that these three components can be well bonded together via hydrogen bonds, strongly associating with the polyhydroxyl structures of flavonoids and saponins. This results in a stronger cell-wall breaking effect of the eutectic solvent on fenugreek fruit and also improves the dispersion of fenugreek fruit powder, thereby increasing the extraction yield of effective components such as flavonoids and saponins. Since active components such as saponins and flavonoids possess multiple active hydroxyl groups, these hydroxyl groups bind to keratin in hair, enhancing the binding strength of the dye to the hair and the dyeing rate of penetration into the hair medulla, leading to better hair dyeing results.

[0103] In this invention, hydrolyzed protein, flaxseed extract, Polygonum multiflorum root extract, Gallnut extract, Aloe vera leaf extract, Angelica sinensis root extract, Ginseng root extract, and Fenugreek fruit extract are used as conditioning agents in the hair dye. Since each conditioning agent is rich in a variety of active ingredients, and these active ingredients have a synergistic effect, the dyeing time of the hair dye can be shortened, preventing damage to the hair caused by the chemical components in the hair dye due to excessive dyeing time.

[0104] Compared with Application Example 1, Application Example 4 uses choline chloride and urea as eutectic solvents, and Application Example 5 uses sodium subtilis lipopeptide and urea as eutectic solvents, which leads to a decrease in the content of active ingredients such as saponins and flavonoids in fenugreek fruit extract, and consequently a decrease in the color-fixing effect of the hair dye.

[0105] Compared with Application Example 1, Application Example 6 adjusted the ratio of choline chloride and sodium subtilisin, which resulted in poorer dispersibility of fenugreek fruit powder in the eutectic solvent and a decrease in the extraction efficiency of fenugreek fruit by the eutectic solvent. This further led to a decrease in the content of active ingredients such as saponins and flavonoids in the fenugreek fruit extract, thereby reducing the color-fixing effect of the hair dye.

[0106] Compared to Application Example 1, in Application Example 7, urea was replaced with ethylene glycol, which reduced the cell wall breaking effect of the extraction solvent on the fenugreek fruit powder. This resulted in a decrease in the extraction yield of effective components such as flavonoids and saponins in the fenugreek fruit extract, and consequently a decrease in the color-fixing effect of the hair dye.

[0107] Comparing application examples 1-5 with the ingredients in the conditioning agent omitted, the experimental results show that hydrolyzed protein, flaxseed extract, Polygonum multiflorum root extract, Gallnut extract, Aloe vera leaf extract, Angelica sinensis root extract, ginseng root extract, and fenugreek fruit extract are all indispensable in this invention. The components in the conditioning agent work synergistically to improve the adhesion between the dye and hair, increase the rate at which the dye penetrates the hair medulla, and thus achieve a rapid coloring effect.

[0108] Experimental Example 2

[0109] Plant-based conditioning hair dyes were prepared by the above-described method for preparing plant-based conditioning hair dyes, and were respectively designated as Application Example 1 and Comparative Application Examples 1-5. The tensile strength and moisturizing effect of hair in Application Example 1 and Comparative Application Examples 1-5 were tested.

[0110] The test method for hair strength is as follows: Healthy white hair with a brightness value (L) of approximately 65, measuring 15cm in length and weighing 5g, was collected and prepared into sample hair bundles. Three sample hair bundles were prepared for each application example. 610g of plant-based conditioning hair dye was evenly applied to the surface of the sample hair bundle, and heated to 45℃ using a heater for 15 minutes. After heat treatment, the sample hair bundles were treated with water to obtain dyed sample hair bundles. The tensile strength of the sample hair bundles was tested according to T / GDCDC 012-2020 "Evaluation Method for the Strength Efficacy of Hair Products".

[0111] The hair moisturizing effect test method is as follows: the dyed sample hair strand (the same sample hair strand in the hair strength test) is placed in an environment with 45% humidity and 25℃ for 24 hours, and the moisturizing effect is detected by MS310-S moisture analyzer. The test results are expressed as moisture content.

[0112] Table 2. Test results of tensile strength and moisturizing effect of plant-based conditioning hair dye.

[0113] Group Tensile strength / MPa Moisture content (%) Application Example 1 1.215 19.4 Comparative Application Example 1 0.872 8.3 Comparative Application Example 2 0.904 10.2 Comparative Application Example 3 1.167 16.8 Comparative Application Example 4 0.993 13.5 Comparative Application Example 5 1.131 12.1

[0114] Experimental results show that the conditioning agent of this invention is rich in various active ingredients, and these active ingredients have a synergistic effect. When the conditioning agent is mixed with the remaining components of the plant-based conditioning hair dye, the hair dye achieves better coloring results by improving the binding strength of the dye to the hair and the dyeing rate of the dye penetrating into the hair medulla. Furthermore, it reduces the damage to the hair and scalp by reducing free radicals generated during the dyeing process. The rationally formulated conditioning agent in the hair dye allows the effective ingredients in the conditioning agent to penetrate into the hair, retaining hair moisture; it also maintains the integrity of the hair cuticle structure, which helps improve the dryness and damage of hair after dyeing.

[0115] Compared with the reduction of the addition of Polygonum multiflorum root extract, Aloe vera leaf extract, Angelica sinensis root extract, Gallnut extract, Ginseng root extract, Flaxseed extract and Fenugreek fruit extract in Application Examples 1-5, the dyes caused damage to the hair during the dyeing process, which in turn led to a decrease in the tensile strength of the hair and caused problems such as dryness and damage.

[0116] Experimental Example 3: Stimulation Test

[0117] Conditioning agents 1-3 were prepared using the above-described method for preparing plant-based conditioning hair dyes to obtain plant-based conditioning hair dyes, and were respectively referred to as application examples 1-3.

[0118] Twelve healthy rabbits weighing at least 4 kg were selected and divided into three groups, with two males and two females in each group. The fur along both sides of the rabbits' spine was removed to create test and observation sites, each approximately 10 × 15 cm in size. A crisscross pattern was made on the test sites using a scalpel. 0.2 mL of the product (Examples 1-3) was applied to each test site, covering an area of ​​1 cm × 1 cm, and then secured with gauze. The observation sites were left untreated. After 24 hours, the gauze was removed, and the skin condition of the test sites was observed. Evaluation was conducted according to the "Cosmetic Safety Technical Specifications" (2015 edition).

[0119] Table 3 Results of the Stimulation Test

[0120] Group Stimulating results Application Example 1 Non-irritating Application Example 2 Non-irritating Application Example 3 Non-irritating

[0121] Experimental results show that the plant-based conditioning hair dye prepared by this invention is non-irritating.

[0122] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A plant-based conditioning hair dye, characterized in that, By weight percentage, the plant-based conditioning hair dye comprises 1.5-2.5% conditioning agent, 2.5-2.9% dyeing agent, 4.5-6% moisturizing agent, 3.8-4.3% alkaline agent, 1.4-1.7% solubilizer, 1-1.4% thickener, 0.1-0.5% preservative, and the balance being deionized water; By weight, the conditioning agent comprises 0.4-0.7 parts hydrolyzed protein, 1.8-2.2 parts flaxseed extract, 0.08-0.12 parts Polygonum multiflorum root extract, 0.3-0.7 parts Gallnut extract, 0.08-0.12 parts Aloe vera leaf extract, 0.08-0.12 parts Angelica sinensis root extract, 0.08-0.12 parts ginseng root extract, and 1-1.4 parts fenugreek fruit extract.

2. The plant-based conditioning hair dye as described in claim 1, characterized in that, The dyeing agent comprises p-phenylenediamine, 2,4-diaminophenoxyethanol hydrochloride, resorcinol, and phenylmethylpyrazolone in a mass ratio of 1.5-1.8:0.5-0.6:0.4-0.5:0.03-0.05; the thickener is carbomer; the humectant comprises propylene glycol and maltodextrin in a mass ratio of 2:0.1-0.2; the alkalinizing agent is ethanolamine; the solubilizer comprises octylphenol polyether-10, magnesium aluminum silicate, and PEG-40 hydrogenated castor oil in a mass ratio of 2:0.7-0.8:0.1-0.2; and the preservative comprises phenoxyethanol, ethylhexylglycerin, potassium sorbate, and citric acid in a mass ratio of 3-5:1.5-2.5:1-1.2:0.5-0.

8.

3. The plant-based conditioning hair dye as described in claim 1, characterized in that, The preparation method of the fenugreek fruit extract includes the following steps: (1) Prepare an extraction solvent by mixing deionized water and a eutectic solvent in a mass ratio of 1:1.5-1.7; (2) Dry, crush, and sieve the fenugreek fruit to obtain powder; (3) Mix the powder and extraction solvent, extract by ultrasonication, filter, and dry to obtain fenugreek fruit extract.

4. The plant-based conditioning hair dye as described in claim 3, characterized in that, In step (1), the eutectic solvent is choline chloride, sodium subtilisin and urea in a mass ratio of 1:0.1-0.2:0.8-0.

9.

5. The plant-based conditioning hair dye as described in claim 3, characterized in that, In step (3), the ultrasonic extraction is performed at 35-45℃ and 250-270W for 35-45 minutes.

6. The plant-based conditioning hair dye as described in claim 3, characterized in that, In step (3), the ratio of the powder to the extraction solvent is 1g:10-20mL.

7. The method for preparing the plant-based conditioning hair dye according to any one of claims 1-6, characterized in that, Includes the following steps: S1: Mix 50-60 wt% of deionized water with a humectant and an alkaline agent to obtain phase A; S2: Mix the remaining deionized water and thickener and add them to phase A. Adjust the temperature to 40-45℃, add the dye and mix to obtain phase B. S3: Add the remaining raw materials to phase B and mix to obtain the finished product.

8. The method for preparing the plant-based conditioning hair dye as described in claim 7, characterized in that, In step S1, the mixing is carried out by stirring and mixing at 80-85℃ and 200-250r / min for 15-25min.

9. The method for preparing the plant-based conditioning hair dye as described in claim 7, characterized in that, In step S2, the mixing is carried out by stirring at 100-130 r / min for 8-10 min.

10. The method for preparing the plant-based conditioning hair dye as described in claim 7, characterized in that, In step S3, the mixing is carried out by stirring at 100-130 r / min for 20-25 min.