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CN-122005359-A - Hair dye integrating dyeing and protecting functions and preparation method thereof

CN122005359ACN 122005359 ACN122005359 ACN 122005359ACN-122005359-A

Abstract

The invention discloses a dye and care hair dye and a preparation method thereof, wherein the hair dye comprises an agent A, an agent B, an agent C and an agent D, wherein the agent A comprises a reducing agent, the agent B comprises sulfhydryl modified hyaluronic acid, the agent C comprises a melanin precursor, the agent D comprises an oxidizing agent, and the sulfhydryl modified hyaluronic acid is prepared by introducing sulfhydryl functional groups on a hyaluronic acid molecular chain. The hair dye provided by the invention has good coloring efficiency and color fastness, and the strength of dyed hair is obviously improved, so that the technical effect of synchronously dyeing and caring hair is realized.

Inventors

  • LIANG SHUJUAN
  • Xia Hanji
  • LIANG YUJIAN

Assignees

  • 广州市圣莎拉化妆品有限公司
  • 广州凯禾科技有限公司

Dates

Publication Date
20260512
Application Date
20260415

Claims (10)

  1. 1. The hair dye is characterized by comprising an agent A, an agent B, an agent C and an agent D, wherein the agent A comprises a reducing agent, the agent B comprises thiol-modified hyaluronic acid, the agent C comprises a melanin precursor, the agent D comprises an oxidizing agent, and the thiol-modified hyaluronic acid is prepared by introducing a thiol functional group into a hyaluronic acid molecular chain.
  2. 2. The dye-care one hair dye according to claim 1, wherein the grafting rate of mercapto groups in the mercapto-modified hyaluronic acid is 0.35-0.7 mmol/g; and/or the molecular weight of the sulfhydryl modified hyaluronic acid is 5-2000 kDa; And/or the pH of the agent A is 8.5-9.5, the pH of the agent B is 6-7, the pH of the agent C is 6-7, the pH of the agent D is 5-9, the pH of the agent A or the agent B or the pH of the agent C or the agent D is regulated by adopting a pH regulator or a pH buffer, the pH regulator is at least one of ammonia water, triethanolamine, diethanolamine, monoethanolamine, sodium hydroxide, sodium carbonate, citric acid, acetic acid, hydrochloric acid and sodium citrate, and the pH buffer is a citric acid/sodium citrate buffer or a phosphate buffer.
  3. 3. The hair dye of claim 1, wherein the agent B or/and agent C further comprises a melanin precursor-modified keratin polypeptide, wherein the melanin precursor-modified keratin polypeptide is chemically modified on a chain segment of the keratin polypeptide.
  4. 4. A hair dye according to claim 1, wherein the reducing agent is thioglycolate or cysteine hydrochloride; And/or the melanin precursor is selected from one or a combination of more than two of tyrosine, levodopa, acetyl tyrosine, oleoyl tyrosine, dopaquinone, dopachrome, 5, 6-dihydroxyindole-2-carboxylic acid, dopamine hydrochloride and cysteindopa; and/or the oxidizing agent is selected from sodium bromate, periodate, persulfate or hydrogen peroxide.
  5. 5. The hair dye of claim 1, wherein the agent C further comprises a plant-derived melanin precursor selected from one or more of walnut green husk extract, black sesame extract, mulberry extract, black bean seed husk extract, black wolfberry anthocyanin and purple potato anthocyanin.
  6. 6. The dye-care one hair dye according to claim 1, wherein the agent A comprises 6-10wt% of a reducing agent, 3-6wt% of a thickening agent, 0.5-1wt% of an antioxidant, 0.1-0.5wt% of a chelating agent and 3-5wt% of a humectant; and/or the agent B comprises 1-3 wt% of sulfhydryl modified hyaluronic acid, 0-3 wt% of melanin precursor modified keratin polypeptide, 1-5 wt% of penetration enhancer, 5-10 wt% of humectant, 0.5-1.5 wt% of thickener and 0.5-1.5 wt% of antioxidant; And/or the agent C comprises 1-3wt% of melanin precursor, 0-3wt% of plant-derived melanin precursor, 0-3wt% of melanin precursor modified keratin polypeptide, 0.5-1wt% of antioxidant, 0.3-1.5wt% of surfactant, 3-8wt% of humectant, 0.5-1.5wt% of thickener and 0.1-0.2wt% of chelating agent; And/or the agent D comprises 0.15-15 wt% of an oxidant, 0-0.5 wt% of a surfactant, 4-8 wt% of a thickener, 0-1.5 wt% of a stabilizer and 0-3 wt% of a conditioner.
  7. 7. The hair dye of claim 6, wherein the thickener is at least one selected from cetyl alcohol, stearyl alcohol, emulsifying wax, hydroxyethyl cellulose, xanthan gum, and carbomer; and/or the stabilizer is selected from sodium stannate or sodium pyrophosphate; and/or the chelating agent is selected from at least one of disodium EDTA, tetrasodium EDTA, sodium citrate and sodium gluconate; and/or the humectant is selected from at least one of glycerol, propylene glycol, butylene glycol, panthenol, sorbitol and trehalose; And/or the surfactant is selected from at least one of cetostearyl alcohol polyether-25, PEG-40 hydrogenated castor oil and alkyl glycoside; and/or the antioxidant is selected from at least one of ascorbic acid or a derivative thereof and sodium sulfite; And/or the penetration enhancer is selected from at least one of azone or its derivative and propylene glycol; And/or the conditioning agent is at least one selected from cationic guar gum, polyquaternium-10, polyquaternium-7, silicone oil, hydrolyzed protein and phytosterol ester.
  8. 8. The method for preparing the hair dye with one dyeing and protecting function, which is characterized by comprising the following steps of preparing an agent A, namely dissolving a reducing agent in water, adding a pH regulator to adjust the pH to 8.5-9.5 to obtain the agent A, preparing an agent B, namely dissolving sulfhydryl modified hyaluronic acid in a pH buffer solution with pH of 6-7, stirring and dissolving to obtain the agent B, preparing an agent C, namely dissolving a melanin precursor in the pH buffer solution with pH of 6-7, stirring and dissolving to obtain the agent C, and preparing an agent D, namely uniformly mixing an oxidizing agent with water, and then adding the pH regulator to adjust the pH to 5-9 to obtain the agent D.
  9. 9. The method for preparing the hair dye for dyeing and protecting one, according to claim 6 or 8, is characterized by comprising the following steps of preparing an agent A, namely premixing a thickening agent and water, heating to 60-70 ℃ to enable the thickening agent and the water to be fully swelled, cooling to below 40 ℃, adding a reducing agent, an antioxidant, a chelating agent and a humectant, stirring and dissolving, adding a pH regulator to be 8.5-9.5, and carrying out ultrasonic defoaming to obtain the agent A; Premixing a thickening agent and a pH buffer solution, heating to 60-70 ℃ to enable the thickening agent and the pH buffer solution to fully swell, cooling to below 40 ℃, adding sulfhydryl modified hyaluronic acid, a penetration enhancer, a humectant and an antioxidant, stirring and dissolving, adding a melanin precursor modified keratin polypeptide, stirring uniformly, and performing ultrasonic defoaming to obtain a B agent; Premixing a thickening agent and a pH buffer solution, heating to 60-70 ℃ to enable the thickening agent and the pH buffer solution to fully swell, cooling to below 40 ℃, adding a melanin precursor, a plant-derived melanin precursor and a surfactant, homogenizing, adding a humectant, a chelating agent and an antioxidant, stirring and dissolving, adding the melanin precursor-modified keratin polypeptide, stirring uniformly, and performing ultrasonic defoaming to obtain a C agent; And (3) preparing a agent D, namely premixing a thickening agent and water, heating to 60-70 ℃ to enable the thickening agent to fully swell, cooling to below 40 ℃, adding a stabilizer, a surfactant and a conditioning agent, homogenizing, adding an oxidant and a pH regulator to adjust the pH to 5-9, and performing ultrasonic defoaming to obtain the agent D.
  10. 10. The application of the hair dye for dyeing and caring one of claims 1-9 is characterized in that the application method of the hair dye comprises the following steps of (1) after hair is washed, applying an agent A to hair at 25-40 ℃, standing for 10-30 min, (2) applying an agent B to hair at 25-40 ℃, standing for 5-15 min, rinsing the hair with clear water, (3) mixing an agent C and an agent D according to a mass ratio of 1:1, applying the mixture to the hair and keeping the mixture at 25-50 ℃ for 30-90 min, rinsing the hair with clear water, and drying to finish dyeing.

Description

Hair dye integrating dyeing and protecting functions and preparation method thereof Technical Field The invention relates to the technical field of cosmetics, in particular to a hair dye integrating dyeing and protecting and a preparation method thereof. Background Traditional oxidative hair dyes mainly rely on phenylenediamine substances such as p-phenylenediamine (PPD) and the like as dye intermediates, and are matched with an oxidant to react and color in the hair. However, such components have a high risk of sensitization, and safety for long-term use is of great concern. Meanwhile, the conventional hair dyeing process causes irreversible damage to hair quality, resulting in dry hair, fragile hair and loss of luster. In the prior art, although a small amount of products which are declared to be one-piece in dyeing and protecting are appeared, most of the products are simply added with some hair care components (such as silicone oil, plant extracts and the like) as post-remediation, so that the problem of synergy of the dyeing process and the hair care process cannot be fundamentally solved. The dyeing component and the hair care component are respectively administrative, and real repair and protection are difficult to realize in the key window period of opening the hair scales. In view of this, the present invention has been made. Disclosure of Invention The invention provides a hair dye with one dyeing and protecting function and a preparation method thereof, and aims to provide a novel hair dye capable of synchronously repairing hair scales and strengthening hair structures in the dyeing process. The invention is realized in the following way: In a first aspect, the invention provides a dye-care hair dye, which comprises an agent A, an agent B, an agent C and an agent D, wherein the agent A comprises a reducing agent, the agent B comprises thiol-modified hyaluronic acid, the agent C comprises a melanin precursor, the agent D comprises an oxidizing agent, and the thiol-modified hyaluronic acid is prepared by introducing a thiol functional group on a hyaluronic acid molecular chain. The hair dye provided by the invention has good coloring efficiency and color fastness, and the strength of dyed hair is obviously improved by 12% -22%. The agent A opens disulfide bonds of keratin on the surface of hair, so that the hair scale structure is reversibly opened, a time window is provided for targeted permeation of thiol-modified hyaluronic acid in the agent B and dynamic recombination of disulfide bonds of the keratin on the hair, a good affinity of a hyaluronic acid chain segment and the hair is utilized, the agent B is enabled to be efficiently adsorbed and anchored on the keratin surface of the hair in the opened state of the hair scale, a dynamic exchange reaction is carried out between thiol and free thiol/disulfide bonds of the keratin, so that the thiol-modified hyaluronic acid is chemically bonded on the keratin surface, then in-situ polymerization reaction is carried out on the hair surface by a melanin precursor of the agent C under the alkaline oxidation environment provided by the agent D, so as to generate melanin-like pigment, free thiol (-SH) on the thiol-modified hyaluronic acid is involved in the polymerization reaction of the melanin precursor through the addition reaction of the thiol and quinone groups of the melanin precursor, so that the binding fastness of the melanin-like pigment and the hair is enhanced, namely the thiol-modified hyaluronic acid is used as a medium to link the keratin and the melanin-like pigment, and the color fastness of the melanin-like pigment is improved, and the coloring efficiency is improved. Furthermore, the hyaluronic acid has excellent moisture retention, film formation and biocompatibility, and can form a flexible protective film on the surface of the hair to physically isolate external injury factors. In addition, the molecular chain structure of the multi-mercapto group of the mercapto group modified hyaluronic acid reversibly participates in disulfide bond recombination, and the disulfide bonds of the hairline damaged by the oxidant are repaired through multi-point dynamic crosslinking, so that the mechanical strength of the hair is rebuilt from the inside, and the tensile strength of the hairline is obviously improved. Through the process, the hair dye provided by the invention can realize one dyeing and protecting process, and improves the dyeing efficiency and the color fastness. In some embodiments, the grafting rate of the mercapto groups in the mercapto-modified hyaluronic acid is 0.35-0.7 mmol/g, the high efficiency and controllability of the mercapto dynamic exchange reaction can be realized under the grafting rate, the excessive mercapto density can cause excessive crosslinking among hyaluronic acid chain segments to reduce the permeability and the flexible film forming capability, and the grafting rate below 0.35mmol/g is insufficient to support