Hair dyeing composition for reducing scalp irritation and process for preparing the same

Abstract

The application discloses a hair dyeing paste capable of reducing scalp stimulation and a preparation process thereof, and has the following beneficial effects: the hair dyeing paste comprises 8-12% of an oxidizing agent, the oxidizing agent comprises a compound of 50% of hydrogen peroxide and 50% of water, that is, the content of the hydrogen peroxide in the hair dyeing paste is not more than 6%, compared with the prior art, the hair dyeing paste can reduce strong stinging and burning of the hair dyeing paste on the scalp and reduce scalp stimulation; in addition, the hair dyeing paste further comprises a hair conditioner, a protective film is formed on the scalp surface by the hair conditioner, penetration of dye intermediates is reduced, stinging and burning are reduced, and scalp stimulation is reduced.

Description

Technical Field

[0001] This invention relates to the field of cosmetic technology, specifically to a hair dye that reduces scalp irritation and its preparation process. Background Technology

[0002] With the rapid development of the hair dyeing and beauty industry and people's continuous pursuit of beauty, hair dyeing has become increasingly accepted. Currently, the main hair dyes used on the market are permanent hair dyes. Existing methods involve mixing hair dye agent A and agent B in a certain ratio (usually 1:1) to complete the dyeing process. Agent A acts as the dye matrix, allowing small-molecule dye intermediates to penetrate into the hair cortex and store undeveloped oxidized dye intermediates. Agent B acts as an oxidant, with hydrogen peroxide as its main component. When agents A and B are mixed, the hydrogen peroxide releases active oxygen, oxidizing the dye intermediates and causing a coupling polymerization reaction to generate large-molecule colored dyes inside the hair shaft, achieving permanent dyeing.

[0003] Existing hair dye B-type products have the following technical problems: their hydrogen peroxide content is relatively high (usually exceeding 6%), which makes the hair dye more likely to cause strong stinging and burning sensations on the scalp, that is, the hair dye is more irritating to the scalp. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a hair dye that reduces scalp irritation and its preparation process, thereby solving the aforementioned technical problems.

[0006] (II) Technical Solution

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a hair dye cream that reduces scalp irritation, comprising the following raw materials by weight percentage: water 78-81%, oxidant 8-12%, thickener 2.8-3.2%, emulsifier 2.5-3.5%, hair conditioning agent 1-1.5%, fragrance 0.1-0.3%, pH adjuster 0.4-0.7%, wherein the oxidant comprises a compound of 50% hydrogen peroxide and 50% water.

[0008] Preferably, the hair conditioner includes mineral oil.

[0009] Preferably, the hair dye that reduces scalp irritation also includes 0.1-0.2% stabilizer.

[0010] Preferably, the stabilizer includes sodium stannate.

[0011] Preferably, the hair dye that reduces scalp irritation also includes 0.5-0.8% chelating agent.

[0012] Preferably, the chelating agent comprises a compound of 60% hydroxyethyl diphosphate and 40% water.

[0013] Preferably, the emulsifier includes a first emulsifier and / or a second emulsifier.

[0014] Preferably, the first emulsifier comprises cetearyl alcohol polyether-25; the second emulsifier comprises a compound of 5% glycerol, 40% glyceryl stearate, and 55% lauric acid / myristic acid / palmitic acid / glyceryl stearate.

[0015] Preferably, the thickener includes cetearyl alcohol; the pH adjuster includes disodium hydrogen phosphate; and the fragrance includes flavoring.

[0016] To solve the above-mentioned technical problems, the present invention provides another technical solution as follows: a preparation process for a hair dye that reduces scalp irritation as described above, comprising the following steps:

[0017] S1. Add phase A raw material to the emulsification pot, heat to 80-85℃, stir evenly, and start cooling;

[0018] S2. When the temperature drops to 45℃, add the B phase raw material to the emulsifying pot and stir evenly.

[0019] S3. Add the C-phase raw material to the emulsifying pot and stir evenly;

[0020] S4. Submit for inspection. After passing the inspection, filter, fill, and package the material.

[0021] The raw materials in phase A include water, thickener, emulsifier, and hair conditioning agent; the raw materials in phase B include pH adjuster; and the raw materials in phase C include oxidant and fragrance.

[0022] (III) Beneficial Effects

[0023] Compared with the prior art, the present invention provides a hair dye cream that reduces scalp irritation and its preparation process, which has the following beneficial effects: The hair dye cream of the present invention includes 8-12% oxidant, which is a compound of 50% hydrogen peroxide and 50% water. That is, the content of hydrogen peroxide in the hair dye cream of the present invention does not exceed 6%, which can reduce the strong stinging and burning of the hair dye cream on the scalp and reduce scalp irritation compared with the prior art. In addition, the hair dye cream of the present invention also includes a hair conditioning agent, which forms a protective film on the scalp surface, reduces the penetration of dye intermediates, reduces stinging and burning, and reduces scalp irritation. Attached Figure Description

[0024] Figure 1 This is a flowchart illustrating the preparation process of a hair dye that reduces scalp irritation according to the present invention. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] This invention provides a hair dye cream that reduces scalp irritation, comprising the following raw materials by weight percentage: water (solvent) 78-81%, oxidant 8-12%, thickener 2.8-3.2%, emulsifier 2.5-3.5%, hair conditioning agent 1-1.5%, fragrance 0.1-0.3%, and pH adjuster 0.4-0.7%, wherein the oxidant comprises a compound of 50% hydrogen peroxide and 50% water.

[0027] It is understood that the hair dye of the present invention can be used as hair dye agent B, which can be mixed with hair dye agent A of the prior art in a ratio (usually 1:1) to complete hair dyeing. Agent A acts as the dye matrix, allowing small molecule dye intermediates to penetrate into the hair cortex and store undeveloped oxidized dye intermediates. Agent B acts as an oxidant. After Agent A and Agent B are mixed, hydrogen peroxide releases active oxygen, oxidizes the dye intermediates, and a coupling polymerization reaction occurs, generating large molecule colored dye inside the hair strand to achieve permanent dyeing.

[0028] Compared with the prior art, the present invention provides a hair dye cream that reduces scalp irritation and its preparation process, which has the following beneficial effects: The hair dye cream of the present invention includes 8-12% oxidant, which is a compound of 50% hydrogen peroxide and 50% water. That is, the content of hydrogen peroxide in the hair dye cream of the present invention does not exceed 6%, which can reduce the strong stinging and burning of the hair dye cream on the scalp and reduce scalp irritation compared with the prior art. In addition, the hair dye cream of the present invention also includes a hair conditioning agent, which forms a protective film on the scalp surface, reduces the penetration of dye intermediates, reduces stinging and burning, and reduces scalp irritation.

[0029] Preferably, the hair conditioning agent includes mineral oil, which is a non-polar inert mineral oil that does not participate in the chemical reaction of hair dyeing oxidation. It is dispersed in the hair dye cream. By using mineral oil as a hair conditioning agent, the following beneficial effects are achieved: (1) Physical barrier film effect: After the hair dye cream is mixed and applied, the mineral oil will preferentially spread on the surface of the scalp stratum corneum to form a thin hydrophobic oil film as a protective film. This protective film blocks some hydrogen peroxide and dye intermediates from directly contacting the scalp stratum corneum cells, reducing the penetration of active substances into the scalp gaps, reducing the chemical stimulation receptors, and alleviating stinging and burning. (2) Repairing and buffering scalp lipid loss: Hydrogen peroxide will strip the scalp's own sebum, causing the scalp to be dry and tight. Mineral oil can replenish the lipids on the scalp surface, alleviate the lipid stripping damage caused by oxidation, and reduce post-dyeing dryness and itching. (3) Improving the lubricity of the cream and reducing mechanical friction stimulation: Mineral oil improves the smoothness of the cream, making the hair dye cream slide better when applied, reducing the friction stimulation of the scalp's minor damage during the rubbing process.

[0030] Preferably, the hair dye of the present invention further includes a stabilizer of 0.1-0.2%, which preferably includes sodium stannate. Adding sodium stannate to the hair dye can prevent the abnormal decomposition of hydrogen peroxide and the release of reactive oxygen species. If hydrogen peroxide is unstable, it will rapidly release a large number of oxygen free radicals locally, which will aggravate oxidative stress on the scalp, causing redness and itching. The stabilizer can inhibit the rapid decomposition of hydrogen peroxide, allowing the oxidation reaction to proceed slowly and reducing instantaneous stimulation.

[0031] Preferably, in response to the problem that metal ions can catalyze the ineffective decomposition of hydrogen peroxide, generate excess free radicals, and aggravate scalp irritation, the hair dye of the present invention further includes a chelating agent of 0.5-0.8%. This chelating agent comprises a compound of 60% hydroxyethyl diphosphate and 40% water. By adding the compound chelating agent of hydroxyethyl diphosphate and water to the hair dye, metal impurities can be complexed, the abnormal explosive decomposition of hydrogen peroxide can be inhibited, and the oxidative impact of a large number of instantaneous free radicals on the scalp can be reduced, thereby synergistically reducing scalp irritation.

[0032] An embodiment of the hair dye cream for reducing scalp irritation of the present invention: 80.1% water, 12% oxidant: a compound of 50% hydrogen peroxide and 50% water, 3% thickener: cetearyl alcohol, 2.6% emulsifier: a compound of 1.8% cetearyl alcohol polyether-25 (first emulsifier), 5% glycerin, 40% glyceryl stearate, and 55% lauric acid (second emulsifier) ​​0.8%, 1% hair conditioning agent: mineral oil, 0.5% chelating agent: a compound of 60% hydroxyethyl diphosphate and 40% water, 0.2% fragrance: (daily use) perfume, 0.5% pH adjuster: disodium hydrogen phosphate, and 0.1% stabilizer: sodium stannate.

[0033] The preparation process of the hair dye that reduces scalp irritation in the above embodiments includes the following steps S1-S4:

[0034] S1. Add phase A raw material to the emulsification pot, heat to 82℃, stir evenly, and start cooling.

[0035] S2. When the temperature drops to 45℃, add the B phase raw material to the emulsifying pot and stir evenly.

[0036] S3. Add the C phase raw material to the emulsification pot and stir evenly to obtain a milky white paste.

[0037] S4. Submit for inspection. After passing the inspection, filter, fill, and package the material.

[0038] The raw materials in phase A include water, thickener, emulsifier, and hair conditioning agent; the raw materials in phase B include pH adjuster, chelating agent, and stabilizer; and the raw materials in phase C include oxidant and fragrance.

[0039] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hair dye that reduces scalp irritation, characterized in that, The raw materials include the following weight percentages: water 78-81%, oxidant 8-12%, thickener 2.8-3.2%, emulsifier 2.5-3.5%, hair conditioner 1-1.5%, fragrance 0.1-0.3%, and pH adjuster 0.4-0.7%, wherein the oxidant comprises a compound of 50% hydrogen peroxide and 50% water.

2. The hair dye cream for reducing scalp irritation according to claim 1, characterized in that: The hair conditioning agent includes mineral oil.

3. The hair dye cream for reducing scalp irritation according to claim 1, characterized in that: It also includes 0.1-0.2% stabilizer.

4. The hair dye cream for reducing scalp irritation according to claim 3, characterized in that: The stabilizer includes sodium stannate.

5. The hair dye cream for reducing scalp irritation according to claim 1, characterized in that: It also includes chelating agents of 0.5-0.8%.

6. The hair dye cream for reducing scalp irritation according to claim 5, characterized in that: The chelating agent comprises a compound of 60% hydroxyethyl diphosphate and 40% water.

7. The hair dye cream for reducing scalp irritation according to claim 1, characterized in that: The emulsifier includes a first emulsifier and / or a second emulsifier.

8. The hair dye cream for reducing scalp irritation according to claim 7, characterized in that: The first emulsifier comprises cetearyl alcohol polyether-25; the second emulsifier comprises a compound of 5% glycerol, 40% glyceryl stearate, and 55% lauric acid / myristic acid / palmitic acid / glyceryl stearate.

9. The hair dye cream for reducing scalp irritation according to claim 1, characterized in that: The thickener includes cetearyl alcohol; the pH adjuster includes disodium hydrogen phosphate; and the fragrance includes flavoring.

10. A preparation process for a hair dye cream that reduces scalp irritation as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Add phase A raw material to the emulsification pot, heat to 80-85℃, stir evenly, and start cooling; S2. When the temperature drops to 45°C, add the B phase raw material to the emulsifying pot and stir evenly; S3. Add the C-phase raw material to the emulsifying pot and stir until homogeneous; S4. Submit for inspection. After passing the inspection, filter, fill, and package the material. The A-phase raw materials include water, thickener, emulsifier, and hair conditioning agent; the B-phase raw materials include pH adjuster; and the C-phase raw materials include oxidant and fragrance.

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