Ammonia-free low-sensitivity essential oil composition for hair dyeing as well as preparation method and application of ammonia-free low-sensitivity essential oil composition

Abstract

The invention belongs to the technical field of hair dyes, and particularly relates to an ammonia-free low-sensitivity essential oil composition for hair dyeing as well as a preparation method and application of the ammonia-free low-sensitivity essential oil composition. The ammonia-free low-sensitivity essential oil composition for hair dyeing is prepared from the following components: coconut oil, camellia seed oil, grape seed oil, macadamia seed oil, simmondsia chinensis seed oil and squalane. The ammonia-free low-sensitivity essential oil composition provided by the invention can simultaneously meet the effects of low irritation, high coloring effect and high dyeing durability.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of hair dyeing agents, and particularly relates to an ammonia-free low-allergy essential oil composition for hair dyeing and a preparation method and application thereof. BACKGROUND

[0002] With the continuous improvement of people's pursuit of beauty, hair dyeing has become a common personal care method. The hair dyes on the market can be roughly divided into plant hair dyes, metal salt hair dyes, direct hair dyes and permanent hair dyes, among which permanent hair dyes still dominate the market.

[0003] The main chemical components in permanent hair dyes include p-phenylenediamine, hydrogen peroxide and ammonia water. The role of ammonia water is to open the scales of hair, helping pigments to penetrate, but it has obvious side effects: strong pungent odor, irritation to the scalp (easy to cause stinging or redness), dry hair after dyeing, and hair dandruff.

[0004] In recent years, there has been widespread concern about using plant essential oils as carriers to more gently, accurately and efficiently deliver dye molecules to the inside of hair strands. For example, Chinese Patent No. CN110051564B discloses a solid color brightening hair dyeing essential oil prepared by the following components: wheat germ oil, rosemary leaf oil, myrtle leaf oil, lavender oil and jasmine flower oil. The technical solution claims that the essential oil prepared by adding it to the hair dye can make the hair color bright and shiny after dyeing, and the hair is soft and does not knot, the dyeing is more durable and firm, and the damage to the hair scales caused by the hair dye is effectively reduced. However, the anti-static effect of this technical solution is not significantly improved, and the dyeing durability effect is not clear after only one wash.

[0005] Chinese Patent No. CN118902919A discloses a composition for reducing hair dyeing damage and caring for the scalp, as well as a preparation method and application. The composition of the technical solution is composed of squalane, sea buckthorn fruit oil and camellia seed oil. The composition provided by the technical solution has the effects of reducing the damage and itching of the scalp caused by hair dyeing, caring for the scalp, reducing hair damage, imparting good combing properties and toughness to the hair, and making the hair healthy. However, the technical solution does not focus on its dyeing effect. SUMMARY

[0006] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application provides an ammonia-free low-allergy essential oil composition for hair dyeing and a preparation method and application thereof. The ammonia-free low-allergy essential oil composition provided by the present application can simultaneously satisfy the effects of low irritation, high coloring effect and high dyeing durability.

[0007] To achieve the above objectives, the first aspect of the present invention provides an ammonia-free, hypoallergenic essential oil composition for hair dyeing, comprising the following components: coconut oil, camellia seed oil, grape seed oil, macadamia seed oil, jojoba seed oil, and squalane.

[0008] In some embodiments of the present invention, the ammonia-free and hypoallergenic essential oil composition for hair dyeing is composed of the following components in parts by weight: 70-100 parts coconut oil, 1-2 parts camellia seed oil, 1-2 parts grape seed oil, 1-2 parts macadamia seed oil, 1-2 parts jojoba seed oil, and 1-2 parts squalane.

[0009] Furthermore, the ammonia-free, hypoallergenic essential oil composition for hair dyeing comprises the following components in parts by weight: 80-100 parts coconut oil, 1-1.5 parts camellia seed oil, 1-1.5 parts grape seed oil, 1-1.5 parts macadamia seed oil, 1-1.5 parts jojoba seed oil, and 1-1.5 parts squalane.

[0010] Furthermore, the ammonia-free, hypoallergenic essential oil composition for hair dyeing comprises the following components in parts by weight: 85-95 parts coconut oil, 1-1.2 parts camellia seed oil, 1-1.2 parts grape seed oil, 1-1.2 parts macadamia seed oil, 1-1.2 parts jojoba seed oil, and 1-1.2 parts squalane.

[0011] Most preferably, the ammonia-free, hypoallergenic essential oil composition for hair dyeing is composed of the following components in parts by weight: 90 parts coconut oil, 1.1 parts camellia seed oil, 1.1 parts grape seed oil, 1.1 parts macadamia seed oil, 1.1 parts jojoba seed oil, and 1.1 parts squalane.

[0012] Coconut (COCOS NUCIFERA) oil: Extracted from coconut meat, it is mainly composed of saturated fatty acids, with a high proportion of medium-chain saturated fatty acids (such as lauric acid and capric acid). It has a high affinity for keratin, can penetrate into hair fibers, and can form a lubricating film on the hair surface.

[0013] Camellia seed oil: Extracted from the seeds of the camellia tree fruit, it contains various unsaturated fatty acids, tea polyphenols, camellia glycosides, tea saponins, vitamin E and other ingredients. It can form a lubricating film on the hair surface, with a light and non-greasy texture, increasing the smoothness and shine of the hair and soothing the scalp.

[0014] Grape (VITIS VINIFERA) seed oil: Extracted from grape seeds, it is rich in phenolic compounds, fatty acids and vitamin E. It can penetrate into the hair cuticle, reduce moisture loss and lock in moisture, repair damaged hair, and enhance the toughness and elasticity of hair strands.

[0015] Macadamia Ternifolia Seed Oil: Extracted from the seeds of macadamia nuts, it is rich in fatty acids such as palmitic acid, arachidonic acid, lauric acid, and stearic acid, as well as protein, vitamins, and minerals. It can deeply penetrate the hair shaft and increase hair elasticity and strength.

[0016] Jojoba (SIMMONDSIA CHINENSIS) seed oil: Extracted from jojoba seeds, it is rich in high-grade fats, 34-50 carbon waxes, free alcohols, natural vitamin E, and minerals. It has good permeability and antibacterial properties, and can help keep hair moisturized and soft.

[0017] Squalane: A hydrocarbon oil with small molecules and strong skin affinity. It can bind to keratin in the hair to form a protective layer, quickly penetrate into the hair shaft, fill the gaps between the hair cuticles, and has anti-inflammatory and antioxidant properties, which help soothe scalp irritation.

[0018] Through multiple screening and optimization experiments, the inventors discovered that a compound of coconut oil, camellia seed oil, grape seed oil, macadamia seed oil, jojoba seed oil, and squalane, used as an ammonia-free, hypoallergenic essential oil composition, works synergistically to reduce direct contact of irritating chemicals with the scalp, significantly minimizing stinging and burning sensations on the scalp and skin. This makes it especially suitable for sensitive scalps and first-time hair dyers. Furthermore, it optimizes the hair cuticle opening process, opening the cuticles more gently and evenly for better color absorption. Additionally, it acts as a carrier, helping dye molecules penetrate the cortex more smoothly, resulting in richer and longer-lasting color. However, it is important to note that the proportions of coconut oil, camellia seed oil, grape seed oil, macadamia seed oil, jojoba seed oil, and squalane must be carefully controlled; otherwise, the hair dye product may become more irritating, and the color absorption and durability may deteriorate.

[0019] The second aspect of the present invention provides a method for preparing an ammonia-free and hypoallergenic essential oil composition for hair dyeing, comprising the following steps: mixing coconut oil, camellia seed oil, grape seed oil, macadamia seed oil, jojoba seed oil and squalane to obtain the composition.

[0020] A third aspect of the present invention provides the application of an ammonia-free, hypoallergenic essential oil composition for hair dyeing in the preparation of hair dyeing products.

[0021] Furthermore, the hair dyeing product includes hair dye cream and color developer.

[0022] The fourth aspect of the present invention provides a method of using an ammonia-free, hypoallergenic essential oil composition for hair dyeing, wherein the ammonia-free, hypoallergenic essential oil composition is mixed with other components of a hair dye to prepare a hair dye.

[0023] Furthermore, the amount of the ammonia-free, hypoallergenic essential oil composition added to the hair dye is 8-10%.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] This invention uses coconut oil, camellia seed oil, grape seed oil, macadamia seed oil, jojoba seed oil, and squalane to create an ammonia-free, hypoallergenic essential oil composition. The mass fractions of these ingredients are controlled. Their combined effect not only reduces direct contact between irritating chemicals and the scalp, significantly decreasing stinging and burning sensations on the scalp and skin, making it especially suitable for sensitive scalps and first-time hair dyers, but also optimizes the hair cuticle opening process, opening the cuticles more gently and evenly for better color absorption. Furthermore, it acts as a carrier, helping dye molecules penetrate the cortex more smoothly, resulting in richer and longer-lasting color. Attached Figure Description

[0026] Figure 1 These are photographs of the hair dye products used in Application Examples 1-4 and Comparative Application Examples 1-7, after 40 washes following dyeing. Detailed Implementation

[0027] To enable those skilled in the art to more clearly understand the technical solutions described in this invention, the following embodiments are provided for illustration. It should be noted that the following embodiments do not constitute a limitation on the scope of protection claimed by this invention.

[0028] Unless otherwise specified, the raw materials, reagents or apparatus used in the following examples and comparative examples are available from conventional commercial sources or can be obtained by existing known methods.

[0029] Coconut oil: Zhongshan Kemei Oil & Chemical Co., Ltd.;

[0030] Camellia seed oil: Hunan Jinchang Biotechnology Co., Ltd.;

[0031] Grape seed oil: Guangzhou GuCui Biotechnology Co., Ltd.;

[0032] Macadamia seed oil: GUSTAV HEESS GMBH;

[0033] Jojoba seed oil: Guangzhou GuCui Biotechnology Co., Ltd.;

[0034] Squalane: APRINNOVA, LLC. Example 1

[0035] Example 1 provides an ammonia-free, hypoallergenic essential oil composition for hair dyeing, comprising the following components in parts by weight: 80 parts coconut oil, 1 part camellia seed oil, 1 part grape seed oil, 1 part macadamia seed oil, 1 part jojoba seed oil, and 1 part squalane.

[0036] The preparation method of the ammonia-free and hypoallergenic essential oil composition for hair dyeing includes the following steps: mixing coconut oil, camellia seed oil, grape seed oil, macadamia seed oil, jojoba seed oil, and squalane. Example 2

[0037] Example 2 provides an ammonia-free, hypoallergenic essential oil composition for hair dyeing, comprising the following components in parts by weight: 100 parts coconut oil, 1.5 parts camellia seed oil, 1.5 parts grape seed oil, 1.5 parts macadamia seed oil, 1.5 parts jojoba seed oil, and 1.5 parts squalane.

[0038] The preparation method of the ammonia-free and hypoallergenic essential oil composition for hair dyeing includes the following steps: mixing coconut oil, camellia seed oil, grape seed oil, macadamia seed oil, jojoba seed oil, and squalane. Example 3

[0039] Example 3 provides an ammonia-free, hypoallergenic essential oil composition for hair dyeing, comprising the following components in parts by weight: 95 parts coconut oil, 1.2 parts camellia seed oil, 1.2 parts grape seed oil, 1.2 parts macadamia seed oil, 1.2 parts jojoba seed oil, and 1.2 parts squalane.

[0040] The preparation method of the ammonia-free and hypoallergenic essential oil composition for hair dyeing includes the following steps: mixing coconut oil, camellia seed oil, grape seed oil, macadamia seed oil, jojoba seed oil, and squalane. Example 4

[0041] Example 4 provides an ammonia-free, hypoallergenic essential oil composition for hair dyeing, comprising the following components in parts by weight: 90 parts coconut oil, 1.1 parts camellia seed oil, 1.1 parts grape seed oil, 1.1 parts macadamia seed oil, 1.1 parts jojoba seed oil, and 1.1 parts squalane.

[0042] The preparation method of the ammonia-free and hypoallergenic essential oil composition for hair dyeing includes the following steps: mixing coconut oil, camellia seed oil, grape seed oil, macadamia seed oil, jojoba seed oil, and squalane.

[0043] Comparative Example 1

[0044] Comparative Example 1 provides an ammonia-free, hypoallergenic essential oil composition for hair dyeing, comprising the following components in parts by weight: 30 parts sea buckthorn fruit oil, 20 parts camellia seed oil, and 50 parts squalane.

[0045] The preparation method of the ammonia-free and hypoallergenic essential oil composition for hair dyeing includes the following steps: mixing sea buckthorn fruit oil, camellia seed oil and squalane evenly.

[0046] Comparative Example 2

[0047] Comparative Example 2 provides an ammonia-free, hypoallergenic essential oil composition for hair dyeing, comprising the following components in parts by weight: 90 parts coconut oil, 1.1 parts camellia seed oil, 1.1 parts Argania shinosa kernel oil, 1.1 parts macadamia seed oil, 1.1 parts jojoba seed oil, and 1.1 parts squalane.

[0048] The preparation method of the ammonia-free and hypoallergenic essential oil composition for hair dyeing includes the following steps: mixing coconut oil, camellia seed oil, argan kernel oil, macadamia seed oil, jojoba seed oil, and squalane.

[0049] Comparative Example 3

[0050] Comparative Example 3 provides an ammonia-free, hypoallergenic essential oil composition for hair dyeing, comprising the following components in parts by weight: 90 parts coconut oil, 1.1 parts camellia seed oil, 1.1 parts grape seed oil, 2.2 parts macadamia seed oil, 0 parts jojoba seed oil, and 1.1 parts squalane.

[0051] The preparation method of the ammonia-free and hypoallergenic essential oil composition for hair dyeing includes the following steps: mixing coconut oil, camellia seed oil, grape seed oil, macadamia seed oil, and squalane.

[0052] Comparative Example 4

[0053] Comparative Example 4 provides an ammonia-free, hypoallergenic essential oil composition for hair dyeing, comprising the following components in parts by weight: 90 parts coconut oil, 1.1 parts camellia seed oil, 2.2 parts grape seed oil, 0 parts macadamia seed oil, 1.1 parts jojoba seed oil, and 1.1 parts squalane.

[0054] The preparation method of the ammonia-free and hypoallergenic essential oil composition for hair dyeing includes the following steps: mixing coconut oil, camellia seed oil, grape seed oil, jojoba seed oil, and squalane.

[0055] Comparative Example 5

[0056] Comparative Example 5 provides an ammonia-free, hypoallergenic essential oil composition for hair dyeing, comprising the following components in parts by weight: 90 parts olive (Olea europaea) fruit oil, 1.1 parts camellia seed oil, 1.1 parts grape seed oil, 1.1 parts macadamia seed oil, 1.1 parts jojoba seed oil, and 1.1 parts squalane.

[0057] The preparation method of the ammonia-free and hypoallergenic essential oil composition for hair dyeing includes the following steps: mixing olive fruit oil, camellia seed oil, grape seed oil, macadamia seed oil, jojoba seed oil, and squalane.

[0058] Comparative Example 6

[0059] Comparative Example 6 provides an ammonia-free, hypoallergenic essential oil composition for hair dyeing, comprising the following components in parts by weight: 90 parts coconut oil, 1.7 parts camellia seed oil, 0.5 parts grape seed oil, 0.5 parts macadamia seed oil, 0.5 parts jojoba seed oil, and 2.3 parts squalane.

[0060] The preparation method of the ammonia-free and hypoallergenic essential oil composition for hair dyeing includes the following steps: mixing coconut oil, camellia seed oil, grape seed oil, macadamia seed oil, jojoba seed oil, and squalane to obtain the final product.

[0061] Comparative Example 7

[0062] Comparative Example 7 provides an ammonia-free, hypoallergenic essential oil composition for hair dyeing, comprising the following components in parts by weight: 40 parts coconut oil, 10.1 parts camellia seed oil, 10.1 parts grape seed oil, 10.1 parts macadamia seed oil, 10.1 parts jojoba seed oil, and 10.1 parts squalane.

[0063] The preparation method of the ammonia-free and hypoallergenic essential oil composition for hair dyeing includes the following steps: mixing coconut oil, camellia seed oil, grape seed oil, macadamia seed oil, jojoba seed oil, and squalane.

[0064] Application Example 1

[0065] Application Example 1 provides a hair dyeing product, including hair dye cream and color developer;

[0066] The hair dye, by weight percentage, comprises the following ingredients: 9.55% of the ammonia-free, hypoallergenic essential oil composition of Example 1, 8.5% cetearyl alcohol, 6% ethanolamine, 2% cetearyl alcohol polyether-25, 0.245% dicetearyl phosphate, 0.455% cetearyl alcohol polyether-10 phosphate, 0.5% fragrance, 0.4% ascorbic acid, 0.5% toluene-2,5-diamine sulfate, 0.2% disodium EDTA, 0.3% p-aminophenol, 0.6% 4-chlororesorcinol, 0.2% 2-methylresorcinol, 0.15% 4-amino-2-hydroxytoluene, 0.55% 1-hydroxyethyl-4,5-diaminopyrazole sulfate, 0.05% 2,4-diaminophenoxyethanol hydrochloride, 0.27% m-aminophenol, and water to make up to 100%.

[0067] The preparation method of the hair dye includes the following steps:

[0068] Cetearyl alcohol, cetearyl alcohol polyether-25, dicetearyl phosphate, and cetearyl alcohol polyether-10 phosphate were added to an oil pan and stirred at 80°C until completely dissolved to obtain the oil phase.

[0069] Add water, toluene-2,5-diamine sulfate, p-aminophenol, 4-chlororesorcinol, 2-methylresorcinol, 4-amino-2-hydroxytoluene, 1-hydroxyethyl-4,5-diaminopyrazole sulfate, 2,4-diaminophenoxyethanol hydrochloride, m-aminophenol, disodium EDTA, and ascorbic acid to an emulsifying pot and stir at 80°C until completely dissolved.

[0070] Under stirring conditions, the oil phase is added to the emulsification pot and stirred for 15 minutes;

[0071] Cool to 45°C, add the ammonia-free, hypoallergenic essential oil composition from Example 1, mix with ethanolamine and fragrance, stir for 20 minutes, and cool to room temperature to obtain the final product.

[0072] The color developing emulsion comprises, by weight percentage: 6% hydrogen peroxide, 3.5% cetearyl alcohol, 1.5% cetearyl alcohol polyether-25, 0.18% hydroxyethyl diphosphate, 0.2% xanthan gum, 0.15% disodium hydrogen phosphate, 0.1% sodium stannate, 1% glyceryl stearate, 3% glycerol, and water to make up to 100%.

[0073] The method for preparing the color-developing emulsion includes the following steps:

[0074] Cetearyl alcohol, cetearyl alcohol polyether-25, and glyceryl stearate were added to an oil pan and stirred at 80°C until completely dissolved to obtain the oil phase.

[0075] Hydrogen peroxide and water are mixed in a mass ratio of 1:1 to obtain an aqueous solution of hydrogen peroxide;

[0076] Hydroxyethylene diphosphate and water were mixed at a mass ratio of 1.5:1 to obtain an aqueous solution of hydroxyethylene diphosphate.

[0077] Add disodium hydrogen phosphate, sodium stannate, xanthan gum, glycerin and remaining water to an emulsifying pot, mix, heat to 80°C, add the oil phase while stirring, and stir for 15 minutes.

[0078] Cool to 55°C, add aqueous solution of hydroxyethyl diphosphate, mix, and stir until homogeneous;

[0079] Cool to 40°C, add hydrogen peroxide aqueous solution, mix, stir evenly, and cool to room temperature to obtain the final product.

[0080] Application Example 2

[0081] Application Example 2 provides a hair dyeing product, including hair dye cream and developer;

[0082] The only difference from Application Example 1 is that the ammonia-free, hypoallergenic essential oil composition of Example 1 is replaced with an equal mass of the ammonia-free, hypoallergenic essential oil composition of Example 2; all else is the same.

[0083] Application Example 3

[0084] Application Example 3 provides a hair dyeing product, including hair dye cream and developer;

[0085] The only difference from Application Example 1 is that the ammonia-free, hypoallergenic essential oil composition of Example 1 is replaced with an equal mass of the ammonia-free, hypoallergenic essential oil composition of Example 3; all else is the same.

[0086] Application Example 4

[0087] Application Example 4 provides a hair dyeing product, including hair dye cream and developer;

[0088] The only difference from Application Example 1 is that the ammonia-free, hypoallergenic essential oil composition of Example 1 is replaced with an equal mass of the ammonia-free, hypoallergenic essential oil composition of Example 4; all else is the same.

[0089] Comparative Application Example 1

[0090] Comparative application example 1 provides a hair dyeing product, including hair dye cream and color developer;

[0091] The only difference from Application Example 1 is that the ammonia-free, hypoallergenic essential oil composition of Example 1 is replaced with an equal mass of the ammonia-free, hypoallergenic essential oil composition of Comparative Example 1; all else is the same.

[0092] Comparative Application Example 2

[0093] Comparative application example 2 provides a hair dyeing product, including hair dye cream and color developer;

[0094] The only difference from Application Example 1 is that the ammonia-free, hypoallergenic essential oil composition of Example 1 is replaced with an equal mass of the ammonia-free, hypoallergenic essential oil composition of Comparative Example 2; all else is the same.

[0095] Comparative Application Example 3

[0096] Comparative application example 3 provides a hair dyeing product, including hair dye cream and color developer;

[0097] The only difference from Application Example 1 is that the ammonia-free, hypoallergenic essential oil composition of Example 1 is replaced with an equal mass of the ammonia-free, hypoallergenic essential oil composition of Comparative Example 3; all other aspects are the same.

[0098] Comparative Application Example 4

[0099] Comparative application example 4 provides a hair dyeing product, including hair dye cream and color developer;

[0100] The only difference from Application Example 1 is that the ammonia-free, hypoallergenic essential oil composition of Example 1 is replaced with an equal mass of the ammonia-free, hypoallergenic essential oil composition of Comparative Example 4; all other aspects are the same.

[0101] Comparative Application Example 5

[0102] Comparative application example 5 provides a hair dyeing product, including hair dye cream and color developer;

[0103] The only difference from Application Example 1 is that the ammonia-free, hypoallergenic essential oil composition of Example 1 is replaced with an equal mass of the ammonia-free, hypoallergenic essential oil composition of Comparative Example 5; all else is the same.

[0104] Comparative Application Example 6

[0105] Comparative application example 6 provides a hair dyeing product, including hair dye cream and developer;

[0106] The only difference from Application Example 1 is that the ammonia-free, hypoallergenic essential oil composition of Example 1 is replaced with an equal mass of the ammonia-free, hypoallergenic essential oil composition of Comparative Example 6; all other aspects are the same.

[0107] Comparative Application Example 7

[0108] Comparative application example 7 provides a hair dyeing product, including hair dye cream and developer;

[0109] The only difference from Application Example 1 is that the ammonia-free hypoallergenic essential oil composition of Example 1 is replaced with an equal mass of the ammonia-free hypoallergenic essential oil composition of Comparative Example 7; all else is the same.

[0110] Performance testing

[0111] 1. Hair dye irritation: Thirty volunteers were selected for testing. They used 2g of the hair dye products from Application Examples 1-4 and Comparative Application Examples 1-7 (the hair dye and developer were mixed evenly at a mass ratio of 1:1) to dye their hair. The dyeing time was 30 minutes. The number of people experiencing stinging was recorded. The irritation level was divided into four levels: *no stinging, **slight itching, ***significant stinging, and ****sting. The results are shown in Table 1 below.

[0112]

[0113] As shown in Table 1, the hair dye products used in Examples 1-4 are much less irritating than those used in Examples 1-7, and are therefore more suitable for sensitive individuals.

[0114] The ammonia-free, hypoallergenic essential oil compositions in Application Examples 1-4 use a blend of specific components, including coconut oil, camellia seed oil, grape seed oil, macadamia seed oil, jojoba seed oil, and squalane, which can effectively reduce the irritation of hair dye.

[0115] In contrast, comparative application examples 1-5 lacked one of the raw materials, namely coconut oil, grape seed oil, macadamia seed oil, and jojoba seed oil, or used other raw materials as substitutes. Comparative application examples 6 and 7 had coconut oil, camellia seed oil, grape seed oil, macadamia seed oil, jojoba seed oil, and squalane in mass fractions that were not within the preferred range, resulting in hair dye products that were more irritating and unsuitable for sensitive individuals.

[0116] 2. Dyeing effect:

[0117] (1) The hair dyeing products of Application Examples 1-4 and Comparative Application Examples 1-7 (the hair dye and developer were mixed evenly at a mass ratio of 1:1) were used to dye the hair of 3-degree human flat wig bundles, with 3 bundles in each group: The hair dyeing product was evenly applied to the human flat wig bundles, with an amount of 1.5 times the mass of the human flat wig bundles. The bundles were left to stand at room temperature (25℃) for 30 minutes, cleaned, and dried. Then they were placed in constant temperature and humidity (25℃, 55%RH) conditions for 24 hours. After that, the L1, a1, and b1 of each group of hair bundles were measured at multiple points using a spectrophotometer. The L0, a0, and b0 of each group of hair bundles before dyeing were also measured using a spectrophotometer. The color difference ΔE1 was calculated. The formula for calculating ΔE1 is as follows:

[0118] △E1=[(L1-L0) 2 +(a1-a0) 2 +(b1-b0) 2 ] 1 / 2 The larger △E1 is, the better the coloring effect;

[0119] (2) Then, the real flat hair wig bundles were soaked in 1000mL of shampoo (5% concentration), shaken and washed for 5 minutes, rinsed with water, and blow-dried. After washing with shampoo 20 times and 40 times respectively, the L2, a2, and b2 of each hair bundle were measured at multiple points using a spectrophotometer, and the color difference ΔE2 was calculated. The calculation formula is as follows:

[0120] △E2=[(L2-L1) 2 +(a2-a1) 2 +(b2-b1) 2 ] 1 / 2 The smaller the △E2, the more durable the staining effect.

[0121] The results are shown in Table 2 below, along with photos of the items after 40 washes. Figure 1 As shown.

[0122] Table 2

[0123]

[0124] As shown in Table 2, the hair dyeing products used in Examples 1-4 have significantly better coloring effect and coloring durability than the hair dyeing products used in Examples 1-7.

[0125] Compared with Application Examples 1-4 and Application Example 7, the coloring effect and dyeing durability are both poor.

[0126] Although the dyeing durability of the comparison application example 5 is good, the coloring effect is poor;

[0127] Although the coloring effect in the comparative application example 6 was not bad, the dyeing durability was poor.

[0128] Based on Tables 1 and 2, we can conclude that the coconut oil, camellia seed oil, grape seed oil, macadamia seed oil, jojoba seed oil, and squalane in the ammonia-free, hypoallergenic essential oil composition for hair dyeing of the present invention are indispensable, cannot be conventionally substituted, and their dosage cannot be arbitrarily changed; hair dyeing products prepared by arbitrarily changing the raw materials or dosage ratios cannot simultaneously satisfy the effects of low irritation, high coloring effect, and high dyeing durability.

[0129] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A non-ammonia-free, hypoallergenic essential oil composition for hair dyeing, characterized in that, It is composed of the following components: coconut oil, camellia seed oil, grape seed oil, macadamia seed oil, jojoba seed oil, and squalane.

2. The ammonia-free, hypoallergenic essential oil composition for hair dyeing according to claim 1, characterized in that, The ammonia-free, hypoallergenic essential oil composition for hair dyeing comprises the following components in parts by weight: 70-100 parts coconut oil, 1-2 parts camellia seed oil, 1-2 parts grape seed oil, 1-2 parts macadamia seed oil, 1-2 parts jojoba seed oil, and 1-2 parts squalane.

3. The ammonia-free, hypoallergenic essential oil composition for hair dyeing according to claim 2, characterized in that, The ammonia-free, hypoallergenic essential oil composition for hair dyeing comprises the following components in parts by weight: 80-100 parts coconut oil, 1-1.5 parts camellia seed oil, 1-1.5 parts grape seed oil, 1-1.5 parts macadamia seed oil, 1-1.5 parts jojoba seed oil, and 1-1.5 parts squalane.

4. The ammonia-free, hypoallergenic essential oil composition for hair dyeing according to claim 3, characterized in that, The ammonia-free, hypoallergenic essential oil composition for hair dyeing consists of the following components in parts by weight: 85-95 parts coconut oil, 1-1.2 parts camellia seed oil, 1-1.2 parts grape seed oil, 1-1.2 parts macadamia seed oil, 1-1.2 parts jojoba seed oil, and 1-1.2 parts squalane.

5. The ammonia-free, hypoallergenic essential oil composition for hair dyeing according to claim 4, characterized in that, The ammonia-free, hypoallergenic essential oil composition for hair dyeing consists of the following components in parts by weight: 90 parts coconut oil, 1.1 parts camellia seed oil, 1.1 parts grape seed oil, 1.1 parts macadamia seed oil, 1.1 parts jojoba seed oil, 1.1 parts squalane, and 2.3 parts squalane.

6. A method for preparing the ammonia-free, hypoallergenic essential oil composition for hair dyeing according to any one of claims 1-5, characterized in that, The process includes the following steps: mixing coconut oil, camellia seed oil, grape seed oil, macadamia seed oil, jojoba seed oil, and squalane.

7. The use of the ammonia-free, hypoallergenic essential oil composition for hair dyeing according to any one of claims 1-5 in the preparation of hair dyeing products.

8. A hair dyeing product, characterized in that, The hair dye product includes the ammonia-free, hypoallergenic essential oil composition for hair dyeing as described in any one of claims 1-5.

9. The hair dyeing product according to claim 8, characterized in that, This includes hair dye and developer.

10. The hair dyeing product according to claim 9, characterized in that, The amount of the ammonia-free, hypoallergenic essential oil composition added to the hair dye is 8-10%.

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