A hypoallergenic composition and hypoallergenic hair dye and preparation method thereof

Abstract

The present invention relates to the technical field of hair dyes, and more specifically, discloses a hypoallergenic composition, a hypoallergenic hair dye and a preparation method thereof. A hypoallergenic composition comprises 20-50 parts of glycyrrhizic acid, 10-30 parts of cedar alcohol, 10-30 parts of hop extract and 10-30 parts of papaya fruit extract. A hypoallergenic hair dye comprises the hypoallergenic composition prepared in the present application. The hypoallergenic composition of the present application can reduce the stimulation of the hair dye to the hair during the hair dyeing process, and at the same time reduce the damage of the hair dye to the hair.

Description

Technical Field

[0001] The present invention relates to the technical field of hair dyes, and in particular to a low-sensitivity composition and a low-sensitivity hair dye and a preparation method thereof. Background Art

[0002] At present, although the existing oxidative hair dye products on the market can meet consumers' demand for hair color changes, they often contain aniline dyes. Aniline dyes in hair dyes mainly act as colorants. This type of dye can bind to the keratin in the hair, thereby changing the color of the hair. In the hair dyeing process, aniline substances form larger molecules through oxidation reactions. These macromolecules can bind more tightly to the hair, making the color more durable. Although aniline dyes can play a role in coloring or color-enhancing in the hair dyeing process, they are also common allergens and have certain toxicity and irritation. Not only are they easy to bind to skin proteins, causing redness, itching and even more serious allergic reactions, but they may also cause diseases such as skin cancer, liver cancer, thyroid cancer and lymphoma, posing a potential threat to consumers' health.

[0003] Therefore, developing a hair dye product with low allergy and little irritation to the skin and scalp has become an urgent problem to be solved in the hair dye industry. Summary of the invention

[0004] In order to develop a hair dye product with low allergy and little irritation to the skin and scalp, the present application provides a low allergy composition and a low allergy hair dye and a preparation method thereof.

[0005] In the first aspect, the present application provides a hypoallergenic composition using the following technical solution: A hypoallergenic composition comprises the following components in parts by weight: 20-50 parts of glycyrrhizic acid, 10-30 parts of cedrol, 10-30 parts of hop extract and 10-30 parts of papaya fruit extract.

[0006] In the above technical scheme, the present application selects glycyrrhizic acid, cedrol, hop extract and papaya fruit extract as components of the hypoallergenic composition, and these four ingredients have good skin compatibility and low allergenicity. Glycyrrhizic acid has good anti-inflammatory and anti-allergic effects, and can effectively alleviate skin irritation and allergic reactions that may be caused during hair dyeing. Cedrol has certain anti-inflammatory and antibacterial effects, and hop extract and papaya fruit extract are rich in antioxidants, which help protect the scalp and hair from oxidative damage. The present application can form a protective barrier on the surface of the skin by reasonably matching glycyrrhizic acid, cedrol, hop extract and papaya fruit extract, help reduce the direct contact between the chemical components in the hair dye and the skin, help regulate the balance of the skin pH value, significantly reduce the irritation of the hair dye to the skin and scalp, soothe the scalp, reduce the irritation and inflammatory reaction of the chemical components in the hair dye to the scalp, relieve the discomfort of the scalp during hair dyeing, relieve the itching and tingling that may occur, and reduce the occurrence of allergic reactions. At the same time, the combination of these four ingredients can provide good moisturizing effect, reduce the damage of hair dye to hair, make hair smoother and more shiny, and enhance the durability of hair dyeing effect.

[0007] Preferably, it comprises 40 parts of glycyrrhizic acid, 20 parts of cedrol, 20 parts of hop extract and 20 parts of papaya fruit extract.

[0008] In the above technical scheme, the present application further optimizes the synergistic effect of the four ingredients by further optimizing the dosage ratio of glycyrrhizic acid, cedrol, hop extract and papaya fruit extract, further enhancing the soothing, moisturizing and anti-inflammatory effects, and achieving the best effect of protecting the scalp and reducing irritation.

[0009] In the second aspect, the present application provides a hypoallergenic hair dye using the following technical solution: A hypoallergenic hair dye comprises the hypoallergenic composition as described in the first aspect.

[0010] In the above technical scheme, the present application significantly reduces the irritation of the hair dye to the scalp and the possibility of allergic reactions by adding a low-sensitivity composition to the low-sensitivity hair dye, while also improving the hair care effect of the hair dye, reducing hair damage, making the hair softer and smoother, further improving the hair dyeing effect, and enhancing the consumer's usage experience.

[0011] Preferably, the low-sensitivity hair dye comprises a colorant and a developer, the mass ratio of the colorant to the developer is 1:1, and the colorant comprises a low-sensitivity composition.

[0012] In the above technical solution, the present application further optimizes the formula of the hair dye and mixes the dye and the developer in a mass ratio of 1:1, thereby ensuring that the hair dye can provide a good dyeing effect. At the same time, the present application adds a hypoallergenic composition to the dye, which can effectively reduce the allergenicity of the hair dye, reduce the irritation and allergenicity of the hair dye when used, and further improve the safety of the hair dye.

[0013] Preferably, the dye comprises the following components in percentage by mass: 4%-10% thickener, 1%-4% emulsifier, 1%-4% oil, 1%-4% surfactant, 2%-4% moisturizer, 0.2%-0.5% first antioxidant, 1%-4% chelating agent, 0.3%-0.5% second antioxidant, 2%-5% dye, 0.1%-2% hair conditioner, 0.2%-0.8% fragrance, 0.1%-4% pH regulator, and the balance is water, wherein the hair conditioner includes a hypoallergenic composition.

[0014] In the above technical scheme, the present application ensures that the hair dye has a good hair care effect while providing a good dyeing effect by optimizing the ingredients of the dye. Among them, the addition of thickeners, emulsifiers, oils, surfactants and moisturizers helps to improve the stability and uniformity of the dye, while providing necessary moisture and protection for the hair; the addition of the first antioxidant and the second antioxidant can effectively resist the free radicals generated during the hair dyeing process and protect the scalp and hair from oxidative damage; the addition of chelating agents helps to stabilize the metal ions in the hair dye and improve the stability of the hair dye. The addition of dyes ensures that the hair dye has a good coloring effect; the addition of hair conditioners, especially the addition of hypoallergenic compositions, further reduces the irritation of the hair dye to the scalp and the possibility of allergic reactions, while improving the hair care effect of the hair dye, making the hair softer and smoother.

[0015] Preferably, the thickener in the dye is one or more of cetearyl alcohol, cetyl alcohol, and stearyl alcohol.

[0016] Preferably, the emulsifier in the dye is one or more of glyceryl stearate, ceteth-2, ceteth-6, laureth-4, oleth-5, ceteareth-25, ceteareth-20, ceteth-21, oleth-30, and oleth-20.

[0017] Preferably, the oil in the dye is one or more of mineral oil, petrolatum, and isopropyl palmitate.

[0018] Preferably, the surfactant in the dye is one or more of stearyl trimethyl ammonium chloride, cetearyl trimethyl ammonium chloride, and behenyl trimethyl ammonium chloride.

[0019] Preferably, the moisturizer in the dye is propylene glycol, glycerin or a combination thereof.

[0020] Preferably, the first antioxidant in the dye is one or more of sodium sulfite and sodium pyrosulfite.

[0021] Preferably, the chelating agent in the dye is one or more of etidronate, tetrasodium etidronate, disodium ethylenediaminetetraacetate, trisodium ethylenediaminetetraacetate, and tetrasodium ethylenediaminetetraacetate.

[0022] Preferably, the second antioxidant in the dye is one or more of isoascorbic acid, ascorbic acid, and sodium isoascorbate.

[0023] Preferably, the dye in the dyeing agent is one or more of toluene-2,5-diammonium sulfate, hydroxyethyl p-phenylenediamine sulfate, 4-chlororesorcinol, p-aminophenol, m-aminophenol, 2,4-diaminophenoxyethanol hydrochloride, 1-hydroxyethyl-4,5-diaminopyrazole sulfate, 1,3-bis-(2,4-diaminophenoxy)propane hydrochloride, 1,5-naphthalenediol, and 4-amino-2-hydroxytoluene.

[0024] Preferably, the pH regulator in the dye is one or more of ammonia water, monoethanolamine, sodium hydroxide and potassium hydroxide.

[0025] Preferably, the hair conditioner in the dye is composed of the following components: polydimethylsiloxane, a hypoallergenic composition, hydrolyzed silk protein and hydrolyzed keratin; the mass ratio of the polydimethylsiloxane, the hypoallergenic composition, hydrolyzed silk protein and hydrolyzed keratin is (2-4):(1-2):(1-2):(1-2).

[0026] In the above technical scheme, the present application ensures that the hair dye has a good hair care effect while providing a good dyeing effect by further optimizing the hair conditioner ingredients in the hair dye. Among them, the addition of polydimethylsiloxane helps to improve the gloss and smoothness of the hair, while reducing the friction between the hair; the addition of the low-sensitivity composition further reduces the irritation of the hair dye to the scalp and the possibility of allergic reactions, while improving the hair care effect of the hair dye, making the hair softer and smoother; the addition of hydrolyzed silk protein and hydrolyzed keratin provides the hair with necessary nutrients, helps to repair damaged hair, and makes the hair healthier and more elastic. Through such a combination of conditioners, the hair dye can not only provide a long-lasting dyeing effect, but also significantly improve the overall health of the hair, prolong the lasting effect after hair dyeing, and enhance the consumer's experience.

[0027] Preferably, the preparation method of the dye comprises the following steps: Step 1: at 80-85°C, mix thickener, emulsifier and oil evenly to obtain prefabricated material 1; at 80-85°C, mix water, surfactant, humectant, first antioxidant and chelating agent evenly to obtain prefabricated material 2; at 20-35°C, mix second antioxidant, dye, hair conditioner and hair conditioner evenly to obtain prefabricated material 3; Step 2: Mix, emulsify and homogenize prefabricated material 1 and prefabricated material 2 at 80-85°C and keep warm for 1-2 hours; Step 3: Cool the material obtained in step 2 to below 40°C, add the prefabricated material 3 and mix evenly, then add the flavor and pH adjuster, stir evenly to obtain the dye.

[0028] In the above technical solution, the present application ensures the stability and uniformity of the hair dye by controlling the temperature and time during the preparation of the dye. The dye preparation method of the present application not only takes into account the stability and uniformity of the hair dye and the protection of the active ingredients in the dye, but also ensures that the hair dye can provide a uniform and consistent dyeing effect when used by controlling the temperature and time during the preparation process, while avoiding potential irritation to the scalp and hair.

[0029] Preferably, the developer comprises the following components in percentage by mass: 2%-6% thickener, 1%-4% first emulsifier, 1%-4% second emulsifier, 1%-4% oil, 2%-4% moisturizer, 1%-4% chelating agent, 0.01%-1% buffer, 3%-9% hydrogen peroxide, 0.01%-1% stabilizer, and the balance is water.

[0030] In the above technical scheme, this application optimizes the formula of the color developer to ensure that the hair dye not only provides a good dyeing effect, but also has a good hair care effect. Through the improved color developer formula of this application, the hair dye can not only provide a long-lasting dyeing effect, but also significantly improve the overall health of the hair, prolong the lasting effect after hair dyeing, and enhance the consumer's experience.

[0031] Preferably, the thickener in the developer is one or more of cetearyl alcohol, cetyl alcohol, and stearyl alcohol.

[0032] Preferably, the first emulsifier in the developer is one or more of glyceryl stearate, ceteth-2, ceteth-6, laureth-4, and oleth-5.

[0033] Preferably, the second emulsifier in the developer is one or more of ceteareth-25, ceteareth-20, ceteth-21, oleth-30, and oleth-20.

[0034] Preferably, the oil in the developer is mineral oil.

[0035] Preferably, the moisturizing agent in the developer is propylene glycol, glycerin or a combination thereof.

[0036] Preferably, the chelating agent in the developer is one or more of etidronate, tetrasodium etidronate, disodium ethylenediaminetetraacetate, trisodium ethylenediaminetetraacetate, and tetrasodium ethylenediaminetetraacetate.

[0037] Preferably, the buffer in the developer is one or more of disodium hydrogen phosphate, disodium dihydrogen phosphate, and sodium dihydrogen phosphate.

[0038] Preferably, the stabilizer in the developer is one or more of tetrasodium pyrophosphate, sodium stannate, and hydroxyquinoline sulfate.

[0039] Preferably, the method for preparing the developer comprises the following steps: Step s1: at 80-85° C., mix the thickener, the first emulsifier and the second emulsifier evenly to obtain phase A; at 80-85° C., mix the oil, the moisturizer, the chelating agent, the buffer and water evenly to obtain phase B; Step s2: at 80-85°C, mix phase A and phase B, emulsify and homogenize, and keep warm for 1-2 hours; Step s3: Cool the material obtained in step s2 to below 40° C., add hydrogen peroxide and a stabilizer, and stir evenly to obtain a color developer.

[0040] In the above technical solution, the present application ensures the stability and uniformity of the developer by controlling the temperature and time during the developer preparation process. The developer preparation method of the present application not only takes into account the stability and uniformity of the developer and the protection of the active ingredients in the developer, but also controls the temperature and time during the preparation process to ensure that the developer can provide a uniform and consistent dyeing effect when used, while avoiding potential irritation to the scalp and hair.

[0041] In summary, the present application includes at least one of the following beneficial technical effects: 1. This application selects glycyrrhizic acid, cedrol, hop extract and papaya fruit extract as components of the hypoallergenic composition. The four ingredients work together to form a protective barrier on the surface of the skin, help regulate the pH balance of the skin, significantly reduce the irritation of hair dyes to the skin and scalp, relieve possible itching and tingling, and reduce the occurrence of allergic reactions. At the same time, the combination of these four ingredients can provide a good moisturizing effect, reduce the damage of hair dyes to hair, make hair more supple and shiny, and improve the durability of hair dyeing effects.

[0042] 2. The present application selects polydimethylsiloxane, a hypoallergenic composition, hydrolyzed silk protein and hydrolyzed keratin as hair conditioners for the dye, and limits the mass ratio of polydimethylsiloxane, the hypoallergenic composition, hydrolyzed silk protein and hydrolyzed keratin to (2-4):(1-2):(1-2):(1-2), so that the dye can not only provide a long-lasting dyeing effect, but also significantly improve the overall health of the hair, prolong the lasting effect after hair dyeing, and enhance the consumer's usage experience. DETAILED DESCRIPTION

[0043] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0044] Example 1 A hypoallergenic hair dye comprises a coloring agent and a developer.

[0045] Among them, the mass ratio of the dye and the developer is 1:1.

[0046] Among them, the coloring agent includes 0.4kg thickener, 0.4kg emulsifier, 0.4kg oil, 0.1kg surfactant, 0.2kg moisturizer, 0.05kg first antioxidant, 0.4kg chelating agent, 0.03kg second antioxidant, 0.2kg dye, 0.2kg hair conditioner, 0.08kg fragrance, appropriate amount of pH adjuster, and water is added to 10kg.

[0047] Among them, the thickener is a mixture of cetearyl alcohol and cetyl alcohol in a mass ratio of 2:1.

[0048] Among them, the emulsifier is a mixture of glyceryl stearate and laureth-4 in a mass ratio of 1:1.

[0049] Among them, the grease is mineral oil.

[0050] Wherein, the surfactant is stearyl trimethyl ammonium chloride.

[0051] The moisturizer is a mixture of propylene glycol and glycerin in a mass ratio of 1:10.

[0052] Among them, the first antioxidant is sodium sulfite.

[0053] Among them, the chelating agent is etidronate.

[0054] Wherein, the second antioxidant is isoascorbic acid.

[0055] The dye is a mixture of toluene-2,5-diammonium sulfate, hydroxyethyl p-phenylenediamine sulfate, 4-chlororesorcinol and m-aminophenol in a mass ratio of 1:1:1:1.

[0056] The pH adjuster is ammonia water.

[0057] The hair conditioning agent is a mixture of polydimethylsiloxane, a hypoallergenic composition, hydrolyzed silk protein and hydrolyzed keratin in a mass ratio of 2:2:1:1.

[0058] Among them, the hypoallergenic composition is a mixture of 3kg of glycyrrhizic acid, 3kg of cedar alcohol, 3kg of hop extract and 1kg of papaya fruit extract.

[0059] Among them, glycyrrhizic acid was purchased from Guangzhou Huayu Biotechnology Co., Ltd.

[0060] Among them, cedarol was purchased from Jiangsu Runfeng Synthetic Technology Co., Ltd.

[0061] Among them, hop extract was purchased from Wuhan Linbaolai Biotechnology Co., Ltd.

[0062] Among them, papaya fruit extract was purchased from Ningxia Vanilla Biotechnology Co., Ltd.

[0063] Wherein, the preparation method of the dye comprises the following steps: Step 1: At 80°C, mix the thickener, emulsifier and oil evenly to obtain prefabricated material 1; at 80°C, mix water, surfactant, humectant, first antioxidant and chelating agent evenly to obtain prefabricated material 2; at 20°C, mix the second antioxidant, dye, hair conditioner and hair conditioner evenly to obtain prefabricated material 3.

[0064] Step 2: At 80°C, mix, emulsify and homogenize prefabricated material 1 and prefabricated material 2, and keep warm for 2 hours.

[0065] Step 3: Cool the material obtained in step 2 to below 40°C, add prefabricated material 3 and mix evenly, then add flavor and stir evenly, finally add appropriate amount of pH adjuster to adjust the pH value to 9, stir evenly, and obtain the dye.

[0066] The developer includes 0.2 kg thickener, 0.1 kg first emulsifier, 0.4 kg second emulsifier, 0.4 kg oil, 0.2 kg moisturizer, 0.4 kg chelating agent, 0.001 kg buffer, 0.3 kg hydrogen peroxide, 0.005 kg stabilizer, and water is added to 10 kg.

[0067] Among them, the thickener is a mixture of cetearyl alcohol and cetyl alcohol in a mass ratio of 1:1.

[0068] The first emulsifier is a mixture of glyceryl stearate and laureth-4 in a mass ratio of 1:1.

[0069] Wherein, the second emulsifier is ceteareth-25.

[0070] Among them, the grease is mineral oil.

[0071] Among them, the moisturizer is a mixture of propylene glycol and glycerin in a mass ratio of 2:8.

[0072] Among them, the chelating agent is etidronate.

[0073] The buffer is disodium hydrogen phosphate.

[0074] Among them, the stabilizer is tetrasodium pyrophosphate.

[0075] The preparation method of the developer comprises the following steps: Step s1: at 80° C., mix the thickener, the first emulsifier and the second emulsifier evenly to obtain phase A; at 80° C., mix the oil, the moisturizer, the chelating agent, the buffer and water evenly to obtain phase B.

[0076] Step s2: At 80°C, mix phase A and phase B, emulsify and homogenize, and keep warm for 2 hours.

[0077] Step s3: Cool the material obtained in step s2 to below 40° C., add hydrogen peroxide and a stabilizer, and stir evenly to obtain a color developer.

[0078] Example 2 A low-sensitivity hair dye, which is different from the embodiment 1 in that it comprises a dye and a developer.

[0079] Among them, the mass ratio of the dye and the developer is 1:1.

[0080] Among them, the coloring agent includes 1kg thickener, 0.1kg emulsifier, 0.1kg oil, 0.4kg surfactant, 0.4kg moisturizer, 0.02kg first antioxidant, 0.1kg chelating agent, 0.05kg second antioxidant, 0.5kg dye, 0.1kg hair conditioner, 0.02kg fragrance, appropriate amount of pH adjuster, and water is added to 10kg.

[0081] The hair conditioning agent is a mixture of polydimethylsiloxane, a hypoallergenic composition, hydrolyzed silk protein and hydrolyzed keratin in a mass ratio of 4:1:2:2.

[0082] Among them, the hypoallergenic composition is a mixture of 5kg of glycyrrhizic acid, 1kg of cedrol, 1kg of hop extract and 3kg of papaya fruit extract.

[0083] Wherein, the preparation method of the dye comprises the following steps: Step 1: At 85°C, mix the thickener, emulsifier and oil evenly to obtain prefabricated material 1; at 85°C, mix water, surfactant, humectant, first antioxidant and chelating agent evenly to obtain prefabricated material 2; at 35°C, mix the second antioxidant, dye, hair conditioner and hair conditioner evenly to obtain prefabricated material 3.

[0084] Step 2: At 85°C, mix, emulsify and homogenize prefabricated material 1 and prefabricated material 2, and keep warm for 1 hour.

[0085] Step 3: Cool the material obtained in step 2 to below 40°C, add prefabricated material 3 and mix evenly, then add flavor and stir evenly, finally add appropriate amount of pH adjuster to adjust the pH value to 9, stir evenly, and obtain the dye.

[0086] The developer includes 0.6 kg thickener, 0.4 kg first emulsifier, 0.1 kg second emulsifier, 0.1 kg oil, 0.4 kg moisturizer, 0.1 kg chelating agent, 0.1 kg buffer, 0.7 kg hydrogen peroxide, 0.1 kg stabilizer, and water is added to 10 kg.

[0087] The preparation method of the developer comprises the following steps: Step s1: at 85° C., mix the thickener, the first emulsifier and the second emulsifier evenly to obtain phase A; at 85° C., mix the oil, the humectant, the chelating agent, the buffer and water evenly to obtain phase B.

[0088] Step s2: At 85°C, mix phase A and phase B, emulsify and homogenize, and keep warm for 1 hour.

[0089] Step s3: Cool the material obtained in step s2 to below 40° C., add hydrogen peroxide and a stabilizer, and stir evenly to obtain a color developer.

[0090] Example 3 A low-sensitivity hair dye, which is different from the embodiment 1 in that it comprises a dye and a developer.

[0091] Among them, the mass ratio of the dye and the developer is 1:1.

[0092] Among them, the coloring agent includes 1kg thickener, 0.1kg emulsifier, 0.1kg oil, 0.4kg surfactant, 0.4kg moisturizer, 0.02kg first antioxidant, 0.1kg chelating agent, 0.05kg second antioxidant, 0.5kg dye, 0.1kg hair conditioner, 0.02kg fragrance, appropriate amount of pH adjuster, and water is added to 10kg.

[0093] The hair conditioning agent is a mixture of polydimethylsiloxane, a hypoallergenic composition, hydrolyzed silk protein and hydrolyzed keratin in a mass ratio of 4:1:2:2.

[0094] Among them, the hypoallergenic composition is a mixture of 5kg of glycyrrhizic acid, 1kg of cedrol, 1kg of hop extract and 3kg of papaya fruit extract.

[0095] Wherein, the preparation method of the dye comprises the following steps: Step 1: At 82°C, mix the thickener, emulsifier and oil evenly to obtain prefabricated material 1; at 82°C, mix water, surfactant, humectant, first antioxidant and chelating agent evenly to obtain prefabricated material 2; at 30°C, mix the second antioxidant, dye, hair conditioner and hair conditioner evenly to obtain prefabricated material 3.

[0096] Step 2: At 82°C, mix, emulsify and homogenize prefabricated material 1 and prefabricated material 2, and keep warm for 1.5 hours.

[0097] Step 3: Cool the material obtained in step 2 to below 40°C, add prefabricated material 3 and mix evenly, then add flavor and stir evenly, finally add appropriate amount of pH adjuster to adjust the pH value to 9, stir evenly, and obtain the dye.

[0098] The developer includes 0.6 kg thickener, 0.4 kg first emulsifier, 0.1 kg second emulsifier, 0.1 kg oil, 0.4 kg moisturizer, 0.1 kg chelating agent, 0.1 kg buffer, 0.7 kg hydrogen peroxide, 0.1 kg stabilizer, and water is added to 10 kg.

[0099] The preparation method of the developer comprises the following steps: Step s1: at 82° C., mix the thickener, the first emulsifier and the second emulsifier evenly to obtain phase A; at 82° C., mix the oil, the humectant, the chelating agent, the buffer and water evenly to obtain phase B.

[0100] Step s2: At 82°C, mix phase A and phase B, emulsify and homogenize, and keep warm for 1.5 hours.

[0101] Step s3: Cool the material obtained in step s2 to below 40° C., add hydrogen peroxide and a stabilizer, and stir evenly to obtain a color developer.

[0102] Example 4 A hypoallergenic hair dye, which is different from Example 1 in that the hair conditioner is a hypoallergenic composition.

[0103] Comparative Example 1 A hair dye, which is different from Example 1 in that an equal amount of glycyrrhizic acid in the hypoallergenic composition is replaced by dipotassium glycyrrhizinate.

[0104] Comparative Example 2 A hair dye, which is different from Example 1 in that the cedar alcohol in the low-sensitivity composition is replaced by cedar oil in an equal amount.

[0105] Comparative Example 3 A hair dye, which is different from Example 1 in that the hop extract in the hypoallergenic composition is replaced by purslane extract in equal amounts.

[0106] Comparative Example 4 A hair dye, which is different from Example 1 in that the papaya fruit extract in the hypoallergenic composition is replaced by an equal amount of milk thistle fruit extract.

[0107] Comparative Example 5 A hair dye, which is different from Example 1 in that it does not contain a hypoallergenic composition.

[0108] Performance Testing 1. Use stimulation evaluation Test sample: The hair dyes of Examples 1-4 and Comparative Examples 1-5 are used by mixing the dye and the developer at a mass ratio of 1:1 to obtain a test sample.

[0109] 90 volunteers were selected, with good hair quality and at least 10cm from the root to the end of the hair without being damaged by perm or dyeing. The volunteers were divided into 7 groups, with 10 people in each group. Before the test, hair bundles of the same length and thickness were taken from the headrest of each volunteer along the hair root as the control group, and then the test samples were used to dye the volunteers' hair. After the hair dyeing operation, hair bundles of the same length and thickness were taken from the headrest of each volunteer as the experimental group. The hair dyeing process was performed by hairdressers with more than 1 year of experience, and the hair dyeing lasted for 30 minutes. During the hair dyeing process, the volunteers' comfort evaluation was recorded, and the volunteers were evaluated for skin irritation 24 hours, 48 ​​hours and 72 hours after hair dyeing. The hair bundles of the control group and the experimental group were tensile tested using a tensile tester, and the elongation at break (%) in the dry hair state was recorded, and the difference in elongation at break = elongation at break of the control group - elongation at break of the experimental group was calculated. The above test results are shown in Table 1.

[0110] The comfort evaluation criteria are as follows: 1 point. Very comfortable: The volunteer did not feel any discomfort during the entire hair dyeing process.

[0111] 2 points. Comfort: The volunteers felt slight discomfort during the hair dyeing process, but it was tolerable.

[0112] 3 points. Average: The volunteers felt obvious discomfort during the hair dyeing process, but did not have a strong reaction.

[0113] 4 points. Discomfort: Volunteers felt strong discomfort during the hair dyeing process and even had a mild allergic reaction.

[0114] 5 points. Very uncomfortable: The volunteers felt extremely uncomfortable during the hair dyeing process and had obvious allergic reactions.

[0115] The evaluation criteria for skin irritation are as follows: 1 point. No irritation: At 0, 24 hours, 48 ​​hours and 72 hours after hair dyeing, the volunteers' skin had no redness, swelling, itching or other irritation reactions.

[0116] 2 points. Mild irritation: 24 hours, 48 ​​hours and 72 hours after hair dyeing, the volunteers' skin showed slight redness or itching, but it disappeared quickly.

[0117] 3 points. Moderate irritation: 24 hours, 48 ​​hours and 72 hours after hair dyeing, the volunteers' skin showed obvious redness, swelling or itching, which lasted for a long time.

[0118] 4 points. Obvious irritation: 24 hours, 48 ​​hours and 72 hours after hair dyeing, the volunteers' skin developed severe redness, itching or other irritation reactions, requiring medical intervention.

[0119] Table 1: Specifically combining the analysis of Examples 1-4 and Comparative Examples 1-5, it can be seen that Examples 1-4 have a lower irritation evaluation and a better comfort evaluation, and the hair dyes of Examples 1-4 have a good elongation at break. It can be seen that the hair dyes of Examples 1-4 have good comfort during use, can significantly reduce the skin irritation caused by the hair dyes, and cause less damage to the hair.

[0120] Specifically analyzing Example 1 and Comparative Examples 1-4, the difference between Comparative Examples 1-4 and Example 1 is that Comparative Examples 1-4 replace glycyrrhizic acid, cedrol, hop extract and papaya fruit extract respectively. From the experimental results, Example 1 effectively reduces the irritation of hair dye, improves the comfort of hair dyeing process and reduces the damage of hair dye to hair. It can be seen that glycyrrhizic acid, cedrol, hop extract and papaya fruit extract have better synergistic effects with each other, and can form a protective layer covering the scalp and hair surface, better protecting the scalp, reducing the irritation of hair dye components to the scalp, and significantly reducing the irritation of hair dye. At the same time, the hypoallergenic composition provided by the present application can also well protect the hair from damage by hair dye during use, and maintain the gloss and elasticity of the hair.

[0121] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A hypoallergenic composition, characterized in that: The invention comprises the following components in parts by weight: 20-50 parts of glycyrrhizic acid, 10-30 parts of cedrol, 10-30 parts of hop extract and 10-30 parts of papaya fruit extract.

2. A hypoallergenic composition according to claim 1, characterized in that: Includes 40 parts of glycyrrhizic acid, 20 parts of cedarol, 20 parts of hops extract and 20 parts of papaya fruit extract.

3. A hypoallergenic hair dye, characterized in that: The method comprises the hypoallergenic composition as claimed in claim 1 or 2.

4. A hypoallergenic hair dye according to claim 3, characterized in that: The low-sensitivity hair dye comprises a dye and a developer, the mass ratio of the dye to the developer is 1:1, and the dye comprises a low-sensitivity composition.

5. A hypoallergenic hair dye according to claim 4, characterized in that: The dye comprises the following components in percentage by mass: 4%-10% thickener, 1%-4% emulsifier, 1%-4% oil, 1%-4% surfactant, 2%-4% humectant, 0.2%-0.5% first antioxidant, 1%-4% chelating agent, 0.3%-0.5% second antioxidant, 2%-5% dye, 0.1%-2% hair conditioner, 0.2%-0.8% fragrance, 0.1%-4% pH adjuster, and the balance is water, wherein the hair conditioner includes a hypoallergenic composition.

6. A hypoallergenic hair dye according to claim 5, characterized in that: The hair conditioner in the dye is composed of the following components: polydimethylsiloxane, a hypoallergenic composition, hydrolyzed silk protein and hydrolyzed keratin; the mass ratio of the polydimethylsiloxane, the hypoallergenic composition, hydrolyzed silk protein and hydrolyzed keratin is (2-4): (1-2): (1-2): (1-2).

7. A hypoallergenic hair dye according to claim 5 or 6, characterized in that: The preparation method of the dye comprises the following steps: Step 1: at 80-85°C, mix thickener, emulsifier and oil evenly to obtain prefabricated material 1; at 80-85°C, mix water, surfactant, humectant, first antioxidant and chelating agent evenly to obtain prefabricated material 2; at 20-35°C, mix second antioxidant, dye, hair conditioner and hair conditioner evenly to obtain prefabricated material 3; Step 2: Mix, emulsify and homogenize prefabricated material 1 and prefabricated material 2 at 80-85°C and keep warm for 1-2 hours; Step 3: Cool the material obtained in step 2 to below 40°C, add the prefabricated material 3 and mix evenly, then add the flavor and pH adjuster, stir evenly to obtain the dye.

8. A hypoallergenic hair dye according to claim 4, characterized in that: The developer comprises the following components in percentage by mass: 2%-6% thickener, 1%-4% first emulsifier, 1%-4% second emulsifier, 1%-4% oil, 2%-4% moisturizer, 1%-4% chelating agent, 0.01%-1% buffer, 3%-9% hydrogen peroxide, 0.01%-1% stabilizer, and the balance is water.

9. A hypoallergenic hair dye according to claim 8, characterized in that: The preparation method of the developer comprises the following steps: Step s1: at 80-85° C., mix the thickener, the first emulsifier and the second emulsifier evenly to obtain phase A; at 80-85° C., mix the oil, the moisturizer, the chelating agent, the buffer and water evenly to obtain phase B; Step s2: at 80-85°C, mix phase A and phase B, emulsify and homogenize, and keep warm for 1-2 hours; Step s3: Cool the material obtained in step s2 to below 40° C., add hydrogen peroxide and a stabilizer, and stir evenly to obtain a color developer.

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