CN114948811A

CN114948811A - Natural hair dye with ginkgo polyphenol as raw material and preparation method thereof

Info

Publication number: CN114948811A
Application number: CN202210517146.8A
Authority: CN
Inventors: 童莉; 查建生; 吴鑫; 孔凡涛; 王会玉; 吴琼珠; 李新岗
Original assignee: Nanjing Sbaike Biotechnology Co ltd
Current assignee: Nanjing Sbaike Biotechnology Co ltd
Priority date: 2022-05-12
Filing date: 2022-05-12
Publication date: 2022-08-30

Abstract

The invention discloses a natural hair dye taking ginkgo polyphenol as a raw material and a preparation method thereof. The preparation method comprises mixing chlorophyll iron sodium salt water solution, NaOH water solution, sodium hyaluronate water solution and sodium benzoate water solution with semen Ginkgo polyphenol and ellagic acid solution, adding the rest raw materials, and mixing well to obtain the hair dye. The natural hair dye can be used for daily hair care, is harmless to human body, has excellent hair blackening effect, and has a color close to that of natural black hair and is not obtrusive; meanwhile, the hair conditioner can permeate into the hair to repair the hair cortex, and can play a role in moisturizing the hair, so that the hair conditioner is smooth, not frizzy and elastic. Compared with long-lasting chemical hair dyeing, the hair dyeing agent is safer, more convenient and more economical.

Description

Natural hair dye with ginkgo polyphenol as raw material and preparation method thereof

Technical Field

The invention belongs to the field of hair dyes, and particularly relates to a natural hair dye taking ginkgo polyphenol as a raw material and a preparation method thereof.

Background

The basic hair dyes currently on the market for retail or professional hair salons are chemical hair dyes and are semi-permanent, the main components of which are toxic chemicals such as aniline, phenols and the like, e.g., p-phenylenediamine, p-aminophenol, m-aminophenol, toluene 2, 5-diamine, resorcinol, p-methylaminophenol, 2, 4-diaminophenoxyethanol hydrochloride, N-bis (2-hydroxyethyl) -p-phenylenediamine sulfate, 4-amino-2-hydroxytoluene, 2-methylresorcinol, hydroxyethyl-p-phenylenediamine sulfate, 1, 5-naphthalenediol, 4-chlororesorcinol and the like. After long-term use of the chemical hair dye, as long as 1 percent of the chemical hair dye is absorbed by skin and enters human bodies, poisoning is accumulated, wherein chemical substances are combined with certain cells, deoxyribonucleic acid in the cell nucleus is damaged, cell mutation is caused, skin cancer, bladder cancer, leukemia and the like are induced, not only is great potential safety hazard existed, but also great influence is existed on the performance of hair, the hair after hair dyeing treatment feels 'hard', 'rough', 'no elasticity', 'difficult combing, easy hair breakage' and the like, and the hair is volatile and lustrous.

Disclosure of Invention

The purpose of the invention is as follows: the first purpose of the invention is to provide a natural hair dye which is harmless to human body and can effectively care dyed hair based on the natural hair dye;

the second object of the present invention is to provide a method for preparing the above natural hair dye.

The technical scheme is as follows: the invention relates to a natural hair dye taking ginkgo polyphenol as a raw material, which comprises the following raw materials in parts by weight: 10-30 parts of ginkgo polyphenol, 3-5 parts of fructus cnidii extract, 3-5 parts of radix sophorae flavescentis extract, 5-10 parts of coconut oil, 5-10 parts of quaternized hydrolyzed wheat protein, 3-8 parts of avocado oil, 2-5 parts of azone, 0.2-0.5 part of mint essential oil, 5-20 parts of ellagic acid, 2.5-20 parts of sodium iron chlorophyllin, 1-5 parts of sodium hyaluronate, 2.5-10 parts of NaOH, 0.5-1 part of sodium benzoate and 95-130 parts of water.

The hair dye disclosed by the invention adopts natural plants, is not harmful to the body, and can be used for maintaining and repairing hair. The ginkgo polyphenol containing rich nutrients such as quercetin, kaempferol, isorhamnetin, ginkgo bi-brass, wax, pectin, gum, chlorophyll, lutein, carotene, anthocyanin and various amino acids is adopted, the rich wax is beneficial to wrapping and adsorbing the melanin components on hair, the ginkgo polyphenol containing various nutrients can nourish hair, has the effects of bacteriostasis and inflammation diminishing, has no toxic or side effect, can well protect and nourish hair, has a good hair blackening effect, and the dyed hair has natural and bright color and luster. Compounding the extracts of radix Sophorae Flavescentis and fructus Cnidii improves dandruff removing effect. The interaction promotion effect of plant-derived ellagic acid and sodium iron chlorophyllin can make hair black and bright. In addition, the coconut oil and the quaternized hydrolyzed wheat protein are compounded, the saturated fatty acid with small molecules, which is rich in the coconut oil, can penetrate into the deep parts of hair scales of the hair, so that the damaged hair cortex is repaired, meanwhile, the quaternized hydrolyzed wheat protein is combined, the damage to the hair cortex of the damaged hair is avoided, the protein is exposed, the induced hydrophilicity is increased, the protein is easily combined with the water-soluble protein, a layer of protein membrane is formed, and the hair cortex can be repaired. The compound avocado oil is combined with azone and hyaluronic acid, so that the avocado oil can be attached to the interior of hair, a new hydrophobic protective film is formed on the surface of the avocado oil, the water loss is prevented, the hair is protected from further damage, and the hair dye is endowed with the gel water function.

Furthermore, the ginkgo polyphenol adopted by the hair dye can be prepared by the following steps:

(1) extracting folium Ginkgo with ethanol under reflux at 60-70 deg.C in water bath for 3-4 hr, and filtering to obtain filtrate and residue;

(2) extracting the residue with ethanol under reflux for 2-3 hr, filtering, mixing filtrates, concentrating under reduced pressure until no ethanol exists, and dissolving in water to obtain insoluble substance and centrifugate;

(3) loading the centrifugate on adsorption resin column, washing with water to remove impurities, eluting with ethanol to obtain eluate, dissolving and mixing the eluate with insoluble substance to obtain extract, and drying to obtain semen Ginkgo polyphenol.

Furthermore, in the step (1) of preparing the ginkgo polyphenol of the hair dye, the adding amount of the ethanol is 6 to 8 times of the mass of the ginkgo leaves.

Furthermore, in the step (2) of preparing the ginkgo polyphenol of the hair dye, the adding amount of the ethanol is 4-7 times of the mass of the filter residue.

Further, the cnidium monnieri fruit extract adopted by the hair dye can be prepared by the following steps: reflux-extracting fructus Cnidii with ethanol at 90-95 deg.C for 3-5 hr, and filtering to obtain filtrate and residue; extracting the residue with ethanol under reflux for 2-3 hr, filtering, mixing with the first filtrate, and concentrating under reduced pressure to obtain extract.

Further, the sophora flavescens extract adopted by the hair dye can be prepared by the following steps: extracting radix Sophorae Flavescentis with ethanol under reflux at 90-95 deg.C in water bath for 3-5 hr, and filtering to obtain filtrate and residue; extracting the residue with ethanol under reflux for 2-3 hr, filtering, mixing with the first filtrate, and concentrating under reduced pressure to obtain extract.

The method for preparing the natural hair dye by taking the ginkgo polyphenol as the raw material comprises the following steps: respectively preparing a sodium chlorophyllin iron sodium salt aqueous solution, a NaOH aqueous solution, a sodium hyaluronate aqueous solution and a sodium benzoate aqueous solution, a ginkgo polyphenol aqueous solution and an ellagic acid aqueous solution, mixing the above solutions, adding a common cnidium fruit extract, a sophora flavescens extract, coconut oil, quaternized hydrolyzed wheat protein, avocado oil, mint essential oil and azone, and uniformly mixing to obtain the hair dye.

Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: the natural hair dye can be used for daily hair care, is harmless to human body, has excellent hair blackening effect, and has a color close to that of natural black hair and is not obtrusive; meanwhile, the hair conditioner can permeate into the hair to repair the hair cortex, and can play a role in moisturizing the hair, so that the hair conditioner is smooth, not frizzy and elastic. Compared with long-lasting chemical hair dyeing, the hair dyeing liquid is safer, more convenient and more economical.

Detailed Description

The technical solution of the present invention will be further described in detail with reference to the following examples. It should be noted that the coconut oil, the quaternized hydrolyzed wheat protein, the avocado oil, the azone, the mint essential oil, the ellagic acid, the sodium iron chlorophyllin, the sodium hyaluronate, the NaOH and the sodium benzoate used as the raw materials in the invention can be purchased from the market.

Example 1

The hair dye of this example contains the raw materials as shown in table 1 below.

Table 1 hair dye raw material components of example 1

Serial number	Raw materials	Content (wt.)
			1	Ginkgo bilobaPolyphenol	20
2	Fructus Cnidii extract	4
			3	Sophora flavescens extract	4
4	Coconut oil	7
			5	Quaternary ammonium hydrolyzed wheat protein	7
6	Avocado oil	5
			7	Azone compounds	3
8	Mint essential oil	0.5
			9	Ellagic acid	10
10	Chlorophyll iron sodium salt	5
			11	Hyaluronic acid sodium salt	1
12	NaOH	4
			13	Sodium benzoate	0.5
14	Water (W)	100

The method for preparing the hair dye of this embodiment includes the steps of:

(1) preparing the gingko polyphenol: oven drying fresh autumn old folium Ginkgo, pulverizing to 10-30 mesh, and weighing; adding 90% ethanol (s/v) 6 times the amount of the extract, reflux-extracting at 60 deg.C for 3 hr, and filtering; extracting the residue with 5 times of 90% ethanol under reflux for 2.5 hr, filtering, mixing filtrates, and concentrating under reduced pressure to obtain extract; dissolving the extract with purified water twice the weight of the raw materials, cooling, and centrifuging to obtain insoluble substances and centrifugate; passing the centrifugate through macroporous adsorbent resin column with a ratio of bed volume to raw material of 1/1(v/s), washing with water twice the bed volume to remove impurities, eluting with 80% ethanol 3 times the bed volume to obtain eluate; and finally mixing and dissolving the centrifugal insoluble substances and the eluent, concentrating to be extractum, and drying in vacuum to obtain the ginkgo polyphenol.

(2) Preparing a fructus cnidii extract: weighing fructus Cnidii, adding 6 times of 75% ethanol (s/v), reflux-extracting at 90 deg.C for 3 hr, and filtering; extracting the residue with 5 times of 75% ethanol under reflux for 2.5 hr, filtering, and mixing filtrates; and finally, concentrating under reduced pressure to obtain an extract.

(3) Preparing a sophora flavescens extract: weighing fructus Cnidii, adding 6 times of 75% ethanol (s/v), reflux-extracting at 90 deg.C for 3 hr, and filtering; extracting the residue with 5 times of 75% ethanol under reflux for 2.5 hr, filtering, and mixing filtrates; and finally, concentrating under reduced pressure to obtain an extract.

(4) Preparing a hair dye: weighing 5 parts of sodium iron chlorophyllin, adding 5 parts of water for dissolving, and preparing a sodium iron chlorophyllin salt aqueous solution; weighing 4 parts of NaOH, adding 4 parts of water for dissolving, and preparing NaOH aqueous solution; weighing 1 part of sodium hyaluronate and 0.5 part of sodium benzoate, adding 50 parts of water, heating for dissolving, and uniformly stirring to prepare an aqueous solution of sodium hyaluronate and sodium benzoate; weighing 20 parts of ginkgo polyphenol and 10 parts of ellagic acid, adding 41 parts of water, heating and dissolving to prepare an aqueous solution of the ginkgo polyphenol and the ellagic acid; mixing the above aqueous solutions, adding fructus Cnidii extract, radix Sophorae Flavescentis extract, oleum Cocois, quaternized hydrolyzed wheat protein, avocado oil, herba Menthae essential oil and azone, and mixing.

Example 2

The hair dye of this example contains the raw materials as shown in the following table 2.

Table 2 hair dye raw material composition of example 2

The method for preparing the hair dye of this embodiment includes the steps of:

(1) preparing the gingko polyphenol: oven drying fresh autumn old folium Ginkgo, pulverizing to 10-30 mesh, and weighing; adding 90% ethanol (s/v) 6 times the amount of the extract, reflux-extracting at 60 deg.C in water bath for 3 hr, and filtering; extracting the residue with 5 times of 90% ethanol under reflux for 2.5 hr, filtering, mixing filtrates, and concentrating under reduced pressure to obtain extract; dissolving the extract with purified water twice the weight of the raw materials, cooling, and centrifuging to obtain insoluble substances and centrifugate; passing the centrifugate through macroporous adsorbent resin column with a ratio of bed volume to raw material of 1/1(v/s), washing with water twice the bed volume to remove impurities, eluting with 80% ethanol 3 times the bed volume to obtain eluate; and finally mixing and dissolving the centrifugal insoluble substances and the eluent, concentrating to be extractum, and drying in vacuum to obtain the ginkgo polyphenol.

(2) Preparing a common cnidium fruit extract: weighing fructus Cnidii, adding 6 times of 75% ethanol (s/v), reflux-extracting at 90 deg.C for 3 hr, and filtering; reflux-extracting the residue with 5 times of 75% ethanol for 2.5 hr, filtering, and mixing filtrates; and finally, concentrating under reduced pressure to obtain an extract.

(4) Preparing a hair dye: weighing 20 parts of sodium iron chlorophyllin, adding 20 parts of water for dissolving, and preparing a sodium iron chlorophyllin salt aqueous solution; weighing 10 parts of NaOH, adding 10 parts of water for dissolving, and preparing NaOH aqueous solution; weighing 2 parts of sodium hyaluronate and 0.5 part of sodium benzoate, adding 50 parts of water, heating for dissolving, and uniformly stirring to prepare an aqueous solution of sodium hyaluronate and sodium benzoate; weighing 30 parts of ginkgo polyphenol and 20 parts of ellagic acid, adding 50 parts of water, heating and dissolving to prepare an aqueous solution of the ginkgo polyphenol and the ellagic acid; mixing the above aqueous solutions, adding fructus Cnidii extract, radix Sophorae Flavescentis extract, oleum Cocois, quaternized hydrolyzed wheat protein, avocado oil, herba Menthae essential oil and azone, and mixing.

Example 3

The hair dye of this example comprises the raw materials as shown in table 3 below.

Table 3 hair dye raw material components of example 3

Serial number	Raw materials	Content (c) of
			1	Ginkgo polyphenols	15
2	Fructus Cnidii extract	3
			3	Sophora flavescens extract	3
4	Coconut oil	8
			5	Quaternary ammonium hydrolyzed wheat protein	8
6	Avocado oil	6
			7	Azone compounds	4
8	Mint essential oil	0.3
			9	Ellagic acid	15
10	Chlorophyll iron sodium salt	2.5
			11	Hyaluronic acid sodium salt	5
12	NaOH	2.5
			13	Sodium benzoate	0.5
14	Water (W)	95

The method for preparing the hair dye of this embodiment includes the steps of:

(1) preparing the gingko polyphenol: oven drying fresh autumn old folium Ginkgo, pulverizing to 10-30 mesh, and weighing; adding 8 times of 90% ethanol (s/v), extracting under reflux at 70 deg.C for 4 hr, and filtering; extracting the residue with 4 times of 90% ethanol under reflux for 2 hr, filtering, mixing filtrates, and concentrating under reduced pressure to obtain extract; dissolving the extract with purified water twice the weight of the raw materials, cooling, and centrifuging to obtain insoluble substances and centrifugate; passing the centrifugate through macroporous adsorbent resin column with a ratio of bed volume to raw material of 1/1(v/s), washing with water twice the bed volume to remove impurities, eluting with 80% ethanol 3 times the bed volume to obtain eluate; and finally mixing and dissolving the centrifugal insoluble substances and the eluent, concentrating to be extractum, and drying in vacuum to obtain the ginkgo polyphenol.

(2) Preparing a common cnidium fruit extract: weighing fructus Cnidii, adding 6 times of 75% ethanol (s/v), reflux-extracting at 100 deg.C for 5 hr, and filtering; reflux-extracting the residue with 5 times of 75% ethanol for 2 hr, filtering, and mixing filtrates; and finally, concentrating under reduced pressure to obtain an extract.

(3) Preparing a sophora flavescens extract: weighing fructus Cnidii, adding 6 times of 75% ethanol (s/v), reflux-extracting at 95 deg.C in water bath for 5 hr, and filtering; extracting the residue with 5 times of 75% ethanol under reflux for 2 hr, filtering, and mixing filtrates; and finally, concentrating under reduced pressure to obtain an extract.

(4) Preparing a hair dye: weighing 2.5 parts of sodium iron chlorophyllin, adding 2.5 parts of water for dissolving, and preparing a sodium iron chlorophyllin salt aqueous solution; weighing 2.5 parts of NaOH, adding 2.5 parts of water for dissolving, and preparing NaOH aqueous solution; weighing 5 parts of sodium hyaluronate and 0.5 part of sodium benzoate, adding 50 parts of water, heating for dissolving, and uniformly stirring to prepare an aqueous solution of sodium hyaluronate and sodium benzoate; weighing 15 parts of ginkgo polyphenol and 15 parts of ellagic acid, adding 40 parts of water, heating and dissolving to prepare an aqueous solution of the ginkgo polyphenol and the ellagic acid; mixing the above aqueous solutions, adding fructus Cnidii extract, radix Sophorae Flavescentis extract, oleum Cocois, quaternized hydrolyzed wheat protein, avocado oil, herba Menthae essential oil and azone, and mixing.

Example 4

The hair dye of this example contains the raw materials as shown in the following table 4.

Table 4 hair dye raw material components of example 4

Serial number	Raw materials	Content (c) of
			1	Ginkgo polyphenols	10
2	Fructus Cnidii extract	4
			3	Sophora flavescens ait extract	3
4	Coconut oil	10
			5	Quaternary ammonium hydrolyzed wheat protein	10
6	Avocado oil	8
			7	Azone compounds	9
8	Mint essential oil	0.2
			9	Ellagic acid	5
10	Chlorophyll iron sodium salt	10
			11	Hyaluronic acid sodium salt	3
12	NaOH	6
			13	Sodium benzoate	1
14	Water (W)	106

The method for preparing the hair dye of this embodiment includes the steps of:

(1) preparing the gingko polyphenol: oven drying fresh autumn old folium Ginkgo, pulverizing to 10-30 mesh, and weighing; adding 8 times of 90% ethanol (s/v), extracting under reflux at 70 deg.C for 4 hr, and filtering; extracting the residue with 7 times of 90% ethanol under reflux for 3 hr, filtering, mixing filtrates, and concentrating under reduced pressure to obtain extract; dissolving the extract with purified water twice the weight of the raw materials, cooling, and centrifuging to obtain insoluble substances and centrifugate; loading the centrifugate onto macroporous adsorbent resin column with a ratio of bed volume to raw material of 1/1(v/s), washing with water twice the bed volume to remove impurities, and eluting with 80% ethanol 3 times the bed volume to obtain eluate; and finally mixing and dissolving the centrifugal insoluble substances and the eluent, concentrating to be extractum, and drying in vacuum to obtain the ginkgo polyphenol.

(2) Preparing a fructus cnidii extract: weighing fructus Cnidii, adding 6 times of 75% ethanol (s/v), reflux-extracting at 90 deg.C for 3 hr, and filtering; reflux-extracting the residue with 5 times of 75% ethanol for 3 hr, filtering, and mixing filtrates; and finally, concentrating under reduced pressure to obtain an extract.

(3) Preparing a sophora flavescens extract: weighing fructus Cnidii, adding 6 times of 75% ethanol (s/v), reflux-extracting at 90 deg.C for 3 hr, and filtering; reflux-extracting the residue with 5 times of 75% ethanol for 3 hr, filtering, and mixing filtrates; and finally, concentrating under reduced pressure to obtain an extract.

(4) Preparing a hair dye: weighing 10 parts of sodium iron chlorophyllin, adding 10 parts of water for dissolving, and preparing a sodium iron chlorophyllin salt aqueous solution; weighing 6 parts of NaOH, adding 6 parts of water for dissolving, and preparing NaOH aqueous solution; weighing 3 parts of sodium hyaluronate and 1 part of sodium benzoate, adding 50 parts of water, heating for dissolving, and uniformly stirring to prepare an aqueous solution of sodium hyaluronate and sodium benzoate; weighing 10 parts of ginkgo polyphenol and 5 parts of ellagic acid, adding 40 parts of water, heating and dissolving to prepare an aqueous solution of the ginkgo polyphenol and the ellagic acid; mixing the above aqueous solutions, adding fructus Cnidii extract, radix Sophorae Flavescentis extract, oleum Cocois, quaternized hydrolyzed wheat protein, avocado oil, herba Menthae essential oil and azone, and mixing.

The using method comprises the following steps: the hair dye prepared by the invention can be used as a care agent, namely, the hair is wetted by hands every morning, a little paste hair dye is dipped and uniformly smeared on white hair, and the white hair is rubbed back and forth for a moment, so that the hair is dyed into black, does not need to be washed immediately, and can be washed before sleeping at night.

Comparative example 1

The basic procedure was the same as in example 1, except that no coconut oil was added to the starting material. The specific raw material components and contents are shown in table 5 below.

TABLE 5 Hair dye raw Material component of comparative example 1

Serial number	Raw materials	Content (wt.)
			1	Ginkgo polyphenols	20
2	Fructus Cnidii extract	4
			3	Sophora flavescens ait extract	4
4	Quaternary ammonium hydrolyzed wheat protein	14
			5	Avocado oil	5
6	Azone compounds	3
			7	Mint essential oil	0.5
8	Ellagic acid	10
			9	Chlorophyll iron sodium salt	5
10	Hyaluronic acid sodium salt	1
			11	NaOH	4
12	Sodium benzoate	0.5
			13	Water (W)	100

The preparation method of the hair dye of the comparative example comprises the following steps:

(1) preparing the gingko polyphenol: the preparation procedure was the same as in example 1.

(2) Preparing a common cnidium fruit extract: the preparation procedure was the same as in example 1.

(3) Preparing a sophora flavescens extract: the preparation procedure was the same as in example 1.

(4) Preparing a hair dye: weighing 5 parts of sodium iron chlorophyllin, adding 5 parts of water for dissolving, and preparing a sodium iron chlorophyllin salt water solution; weighing 4 parts of NaOH, adding 4 parts of water for dissolving, and preparing NaOH aqueous solution; weighing 1 part of sodium hyaluronate and 0.5 part of sodium benzoate, adding 50 parts of water, heating for dissolving, and uniformly stirring to prepare an aqueous solution of sodium hyaluronate and sodium benzoate; weighing 20 parts of ginkgo polyphenol and 10 parts of ellagic acid, adding 41 parts of water, heating and dissolving to prepare an aqueous solution of the ginkgo polyphenol and the ellagic acid; mixing the above aqueous solutions, adding fructus Cnidii extract, radix Sophorae Flavescentis extract, quaternized hydrolyzed wheat protein, avocado oil, herba Menthae essential oil and azone, and mixing.

Comparative example 2

The basic procedure was the same as in example 1, except that azone was not added to the starting material. The specific raw material components and contents are shown in table 5 below.

The hairdye of this comparative example contained the raw materials as shown in the following table 6.

TABLE 6 Hair dye raw Material component of comparative example 2

Serial number	Raw materials	Content (wt.)
			1	Ginkgo polyphenols	20
2	Fructus Cnidii extract	4
			3	Sophora flavescens extract	4
4	Coconut oil	7
			5	Quaternary ammonium hydrolyzed wheat protein	7
6	Avocado oil	5
			7	Mint essential oil	0.5
8	Ellagic acid	10
			9	Chlorophyll iron sodium salt	5
10	Hyaluronic acid sodium salt	1
			11	NaOH	4
12	Sodium benzoate	0.5
			13	Water (W)	100

And (3) performance detection:

(1) tensile Property test

The hair dye can effectively dye hair, and can repair the dyed hair, so that the performance loss caused by hair dyeing, such as hair hardness, no elasticity, split, easy hair breakage and the like, is avoided. Wherein, a hair stretcher is used for evaluating the toughness, namely the elasticity, of the hair by stretching a single hair. Therefore, the diameter of each hair is measured and recorded by using a digital display outside micrometer for hair 1 month after the hair dye is continuously used, 20 hair is selected from the hair, the diameter difference is not more than 5 mu m, the 20 hair is prepared into a tensile sample, and the tensile test of each hair is carried out. The results obtained are shown in table 7 below, in which table 7 the tensile strength is tensile force/cross-sectional area.

Table 7 tensile properties test data

As can be seen from Table 7, after the hair dye of the present invention is continuously used for one month, the hair toughness is significantly improved, and the hair dye can be used as a daily care product, which not only can achieve the effect of hairdressing, but also can maintain the hair. While comparative example 1, without the addition of coconut oil, had a tensile strength that was substantially not as different from that of undyed hair; in contrast, in comparative example 1, no azone was added, which increased the tensile strength compared to the undyed hair, but still decreased it compared to examples 1 to 4. The coconut oil is added and compounded with the quaternized hydrolyzed wheat protein, so that the micromolecular saturated fatty acid rich in the coconut oil can penetrate into the deep part of hair scales to repair damaged hair cortex, and meanwhile, the quaternized hydrolyzed wheat protein is combined to damage the hair cortex of damaged hair, so that the protein is exposed, the induced hydrophilicity is increased, the protein is easily combined with water-soluble protein to form a layer of protein membrane, and the hair cortex can be repaired.

(2) Sensory testing:

the use effect of the natural hair dye was scored by a scoring group consisting of 10 persons, and the full score was 105 points, and the average value was taken.

a. And (3) hair dyeing color difference comparison:

the results obtained by applying the natural hair dye according to the present invention to white hair are shown in the following table 8:

TABLE 8 comparison of dyeing effects

b. Skin allergy test:

the natural hair dye of the present invention was applied to the forearm of the skin, and the condition of the skin was observed after one day, and the results obtained were as shown in the following table 9:

table 9 skin safety test

Examples	Skin condition	Scoring
			Example 1	Without change	5
Example 2	Without change	5
			Example 3	Without change	5
Example 4	Without change	5
			Comparative example 1	Without change	5
Comparative example 2	Without change	5

c. Smoothness and combing property test:

after one month of continuous use of the hair dye of the present invention, the smoothness and combing property of the hair were tested, and the obtained scores were as follows:

TABLE 10 Hair smoothness test

According to the sensory test, the natural hair dye prepared by the invention can play a moisturizing role on the hair, so that the hair is smooth, unhappy and elastic, and the effects of dyeing and nursing are achieved. Meanwhile, the avocado oil is added into the hair dye and combined with the azone and the hyaluronic acid, so that the avocado oil can be attached to the interior of hair, a new hydrophobic protective film is formed on the surface of the avocado oil, water loss is prevented, the hair is protected from further damage, and the hair dye is endowed with the hair moistening and caring functions.

Claims

1. A natural hair dye taking ginkgo polyphenol as a raw material is characterized by comprising the following raw materials in parts by weight: 10-30 parts of ginkgo polyphenol, 3-5 parts of fructus cnidii extract, 3-5 parts of radix sophorae flavescentis extract, 5-10 parts of coconut oil, 5-10 parts of quaternized hydrolyzed wheat protein, 3-8 parts of avocado oil, 2-5 parts of azone, 0.2-0.5 part of mint essential oil, 5-20 parts of ellagic acid, 2.5-20 parts of sodium iron chlorophyllin, 1-5 parts of sodium hyaluronate, 2.5-10 parts of NaOH, 0.5-1 part of sodium benzoate and 95-130 parts of water.

2. The natural hair dye using ginkgo polyphenol as a raw material as set forth in claim 1, wherein: the ginkgo polyphenol is prepared by the following steps:

3. The natural hair dye using ginkgo polyphenol as a raw material as set forth in claim 2, wherein: in the step (1), the adding amount of the ethanol is 6-8 times of the mass of the ginkgo leaves.

4. The natural hair dye using ginkgo polyphenol as a raw material as set forth in claim 2, wherein: in the step (2), the adding amount of the ethanol is 4-7 times of the mass of the filter residue.

5. The natural hair dye using ginkgo polyphenol as a raw material as set forth in claim 1, wherein: the fructus cnidii extract is prepared by the following steps: reflux-extracting fructus Cnidii with ethanol at 90-95 deg.C for 3-5 hr, and filtering to obtain filtrate and residue; then extracting the filter residue with ethanol under reflux for 2-3h, filtering and mixing with the first filtrate, and concentrating under reduced pressure to obtain extract.

6. The natural hair dye using ginkgo polyphenol as a raw material as set forth in claim 1, wherein: the sophora flavescens extract is prepared by the following steps: extracting radix Sophorae Flavescentis with ethanol under reflux at 90-95 deg.C in water bath for 3-5 hr, and filtering to obtain filtrate and residue; extracting the residue with ethanol under reflux for 2-3 hr, filtering, mixing with the first filtrate, and concentrating under reduced pressure to obtain extract.

7. A method for preparing the natural hair dye using ginkgo polyphenol as a raw material according to claim 1, which is characterized by comprising the following steps: respectively preparing a chlorophyll iron sodium salt aqueous solution, a NaOH aqueous solution, a sodium hyaluronate aqueous solution and a sodium benzoate aqueous solution, and a ginkgo polyphenol and ellagic acid solution, mixing the above solutions, adding a common cnidium fruit extract, a sophora flavescens extract, coconut oil, quaternized hydrolyzed wheat protein, avocado oil, mint essential oil and azone, and uniformly mixing to obtain the hair dye.