CN111714390A - Whitening essence milk and preparation method thereof - Google Patents

Abstract

The invention provides whitening essence milk which is prepared from the following components in percentage by weight: 2-5% of glycerin, 2-5% of butanediol, 262-5% of glyceryl polyether, 0-0.2% of xanthan gum, 0-0.3% of gum arabic, 0.1-0.3% of sodium hyaluronate, 1-3% of an emulsifier, 0-1.5% of a viscosity regulator, 0-5% of squalane, 0-5% of isononyl isononanoate, 0-5% of diethylhexyl carbonate, 0.1-1.5% of tocopherol, 0.1-0.3% of an antioxidant, 0.5-2% of a plant compound, 0.1-0.5% of phenylethyl resorcinol, 1-5% of a palm leaf extract, 0-0.3% of bisabolol, 0-3% of a portulaca oleracea extract, 1-5% of beta-glucan, 0-1.0% of panthenol, 0.3-2.0% of a preservative, 1-5% of a polymer humectant and 0-1% of an acid-base regulator. Compared with the prior art, the whitening essence emulsion disclosed by the invention uses a simple emulsifying system, and has the remarkable characteristics of good experience effect, good moisturizing and whitening effects and high safety.

Description

Whitening essence milk and preparation method thereof

Technical Field

The invention relates to the technical field of cosmetics, and particularly relates to whitening essence milk with a moisturizing effect and a preparation method thereof.

Background

The skin is the largest and most easily seen organ of the body and is also the natural barrier of the human body. It can not only reflect the health level of human body, but also reflect the concrete embodiment of "external beauty" of human body. "it is everyone who likes beauty", people have a continuous pursuit for beautifying their own cosmetics since ancient times. Conventional cosmetics are mainly used for skin care, skin cleansing and improvement of skin softness by virtue of their nutritional ingredients and moisture retention ingredients. With the change of living environment and the improvement of living standard of people, the skin care product with special effects such as whitening, anti-wrinkle and dark eye circle removal becomes a hot spot of personal care product industry. And the whitening products are more popular with consumers.

The basal layer cells of the human epidermis contain 4-5% of pigment cells, wherein melanin is a key factor determining the skin color and is also a main reason causing the skin color change. Two different types of melanin also have an effect on the color of the skin. Eumelanin is black or brown in color and is synthesized by tyrosinase. Pheomelanin is orange and is synthesized from tyrosine and cysteine. The synthetic pathway of melanin is shown in figure 1.

The main means of whitening is to inhibit the generation of melanin and interfere the formation and transfer process of melanin. Within melanocytes, including the selective destruction of melanocytes and inhibition of tyrosinase activity; outside of the melanocyte includes interference with transfer of melanosomes, increased degradation of melanin in the keratin cell, and the like. Some substituted phenolic compounds such as hydroxyanisole, hydroquinone, resorcinol, arbutin and the like show specific toxicity to melanocytes; the mercury salt and some protein denaturants have an inhibitory effect on tyrosinase; ascorbic acid has reducing effect, and can prevent dopa generated by tyrosine under tyrosinase catalysis from being oxidized into dopaquinone.

There are many whitening products on the market at present. But the safety and effectiveness of each product are not uniform. Some whitening products have quick response, such as 'a whitening mask', and actually various prohibited components such as dexamethasone, beclomethasone, mercury, hydroquinone and the like are added in most of the products, so that health of consumers is endangered after the products are used. Some approved whitening agents, such as niacinamide, salicylic acid, vitamin C, kojic acid, etc., also cause irritation to the skin. Therefore, the formula design of the whitening skin care product must ensure the safety while ensuring the effectiveness.

The existing products generally focus on whitening efficacy, and few systematic studies on the safety of the products are available. Chinese patent CN107496319A discloses a water replenishing, whitening and relieving essence lotion which is mainly prepared from the following raw materials: chamomile extract, astragalus extract, volcanic mud essence water, hyaluronic acid, ginseng extract, pomegranate fruit extract, arbutin, nicotinamide, pearl powder, lycium ruthenicum extract and camellia seed oil. Chinese patent CN106727163A discloses a whitening and freckle-removing cosmetic and a preparation method thereof, wherein the raw material formula of the cosmetic comprises, by weight, 2-4 parts of gastrodia elata, 1-2 parts of asarum, 3-5 parts of polygonatum odoratum, 3-5 parts of red dates, 2-3 parts of centella asiatica, 3-4 parts of pseudo-ginseng, 1-2 parts of schizonepeta, 1-2 parts of chrysanthemum, 2-3 parts of mulberry leaves, 2-4 parts of rhodiola rosea, 2-3 parts of bighead atractylodes rhizome, 2-3 parts of long pepper and 1-2 parts of pepper. The wide variety of whitening agents used in these products results in a high safety risk for the product.

On the other hand, moisturizing function is the first appeal of people to cosmetics. Functionally, the more hydrated the skin, the faster the transdermal absorption rate, and the enhanced penetration of lipophilic and non-polar substances. For whitening skin care products, moisturizing is particularly important because melanin is synthesized in melanocytes located in the basal layer of the skin and then transported to keratinocytes, and a whitening agent needs to be delivered into the epidermal layer to exert its effect, so high moisturizing content in the whitening skin care products can improve bioavailability of whitening active substances. The most traditional and widely used delivery system is an oil-water emulsion, and compared with a transparent aqueous gel system of a common whitening essence product, the delivery system has a better moisturizing effect and is more beneficial to the product to play a role. However, the whitening agent contains more alcohols or salts, so that great challenge is provided for the stability of an emulsion type formula system, if the dosage of the emulsifier and the thickener is increased to stabilize the formula system, the product experience feeling is poor, and a large amount of emulsifier forms new challenge for the safety of the product. Therefore, the general product cannot be obtained in both the aspects of better experience feeling and formula stability. For example, patent CN104922024A discloses an emulsion-based essence with skin-care and whitening effects, which is prepared from the following raw materials in parts by weight: 13-25 parts of aloe extract, 5-11 parts of hydroxymethyl cellulose, 6-9 parts of vitamin A, 12-18 parts of water-soluble lanolin, 4-8 parts of schisandra extract, 4-7 parts of olive oil, 3-5 parts of glycerol monostearate, 1-3.5 parts of butyl stearate, 2-6 parts of daffodil bulb extract, 0.15-0.25 part of preservative, 0.6-1.2 parts of anti-allergic agent, 0.2-0.4 part of lecithin, 0.6-1.2 parts of pearl powder, 40 parts of mineral water, 6-9 parts of dodecyl glucoside, 4-8 parts of paraffin oil, 7-14 parts of wheat germ protein and 5-8 parts of glycerol monostearate. Although the product has certain whitening and moisturizing effects, the product has poor experience feeling and low safety because more than 13% of emulsifier is added.

Disclosure of Invention

The invention aims to solve the problems and provides a formula of whitening essence milk with good moisture retention and high safety and a preparation method thereof. Compared with the prior art, the whitening essence emulsion disclosed by the invention uses a simple emulsifying system, and has the remarkable characteristics of good experience effect, good moisturizing and whitening effects and high safety.

In order to achieve the purpose of the invention, the invention provides whitening essence milk which is prepared from the following components in percentage by weight: 2-5% of glycerin, 2-5% of butanediol, 262-5% of glyceryl polyether, 0-0.2% of xanthan gum, 0-0.3% of gum arabic, 0.1-0.3% of sodium hyaluronate, 1-3% of an emulsifier, 0-1.5% of a viscosity regulator, 0-5% of squalane, 0-5% of isononyl isononanoate, 0-5% of diethylhexyl carbonate, 0.1-1.5% of tocopherol, 0.1-0.3% of an antioxidant, 0.5-2% of a plant compound, 0.1-0.5% of phenylethyl resorcinol, 1-5% of a palm leaf extract, 0-0.3% of bisabolol, 0-3% of a portulaca oleracea extract, 1-5% of beta-glucan, 0-1.0% of panthenol, 0.3-2.0% of a preservative, 1-5% of a polymer humectant and 0-1% of an acid-base regulator.

Furthermore, the molecular weight range of the sodium hyaluronate is 0.8-30 ten thousand.

Furthermore, the emulsifier is one or a mixture of more of glyceryl monostearate, polyglycerol-3 methyl glucose distearate, alkyl glucoside and fatty acid ester thereof, and polyether surfactant.

Further, the viscosity regulator is composed of acrylic ester polymers or acrylic polymers; the acrylic ester polymer is selected from an acryloyl dimethyl ammonium taurate/behenyl polyether-25 methacrylate cross-linked polymer; the acrylic polymer is selected from the group consisting of ammonium acryloyldimethyltaurate/VP copolymers.

Further, the antioxidant is a compound of one or more of 2, 6-di-tert-butyl-4-methylphenol, butyl hydroxy anisole, tert-butyl hydroquinone and bis-ethylhexyloxyphenol methoxyphenyl triazine.

Furthermore, the plant whitening compound comprises a glycyrrhiza glabra extract, marshmallow, rice chaff and rapeseed oil.

Further, the preservative comprises one or more of phenoxyethanol, 1, 2-octanediol, 1, 2-decanediol, p-hydroxyacetophenone, ethylhexylglycerin, methyl p-hydroxybenzoate, ethyl p-hydroxybenzoate, propyl p-hydroxybenzoate, caprylhydroxamic acid, benzoic acid and benzyl alcohol.

Further, the polymer humectant comprises one or any combination of PEG/PPG/polytetramethylene glycol-8/5/3 glycerin, PEG/PPG/-17/6 copolymer, acrylic acid/MA copolymer sodium, methyl gluceth-10 and polyglutamic acid sodium.

Further, the acid-base regulator comprises one or any combination of sodium hydroxide, potassium hydroxide, triethanolamine, citric acid and salts thereof.

On the other hand, the invention provides a preparation method of the whitening essence milk, which comprises the following steps:

1) adding hyaluronic acid, xanthan gum and Arabic gum into glycerol and glyceryl polyether-26, and premixing to obtain mixed dispersion;

2) adding the mixed dispersion into a water phase kettle filled with water under the condition of stirring, stirring and heating to 75-85 ℃, and preserving heat for half an hour to obtain a water phase mixture;

3) uniformly stirring and mixing an emulsifier, a viscosity regulator, squalane, isononyl isononanoate, diethylhexyl carbonate, tocopherol and an antioxidant in an oil phase kettle, heating to 80 ℃, and completely dissolving to obtain an oil phase mixture;

4) adding the oil phase mixture obtained in the step 3) into the water phase mixture obtained in the step 2), keeping the temperature at 75-80 ℃, preparing the oil phase and the water phase into uniform emulsion by using a vacuum emulsifying machine, and slowly stirring and cooling;

5) uniformly mixing phenethyl resorcinol and butanediol, and stirring and dissolving at 40-45 ℃ to obtain a dispersion liquid;

6) and (3) cooling the emulsion in the step 4) to 40-45 ℃, then sequentially adding the dispersion, the plant whitening compound, the palm tree extract, bisabolol, the purslane extract, beta-glucan, panthenol, the polymer humectant, the acid-base regulator and the preservative in the step 5), and continuously stirring and cooling to 30-35 ℃ to obtain the whitening essence emulsion.

Compared with the prior art, the invention has the beneficial effects that: according to the formula and the preparation method of the high-safety whitening essence emulsion with the moisturizing effect, provided by the invention, the emulsion system is utilized, the moisturizing effect is provided, meanwhile, the transdermal absorption of the whitening agent can be promoted, the bioavailability of the whitening agent is improved, and the whitening effect of the product is improved. The whitening cream disclosed by the invention not only uses the phenethyl resorcinol as a chemical whitening agent, but also uses a plant whitening agent, combines the rapid whitening of the chemical whitening agent with the safety of the plant whitening agent, reduces the dosage of the chemical whitening agent, uses a small amount of emulsifier with a simple structure, and gives consideration to the three aspects of safety, effectiveness and experience. The product prepared by the formula and the method provided by the invention is proved to have excellent whitening effect, high moisturizing performance, extremely high safety and good experience.

Drawings

FIG. 1 is a prior art route to melanin biosynthesis.

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the intended purpose, the following detailed description is given for the specific implementation manner, effectiveness and safety of the present invention in combination with the embodiments.

Example 1

The embodiment provides a whitening essence milk, which has the following formula:

3% of glycerin, 4% of butanediol, 3% of glyceryl polyether-263, 0.1% of xanthan gum, 0.1% of gum arabic, 0.1% of sodium hyaluronate, 2% of an emulsifier, 1.0% of a viscosity regulator, 4% of squalane, 2% of isononyl isononanoate, 0.5% of tocopherol, 0.1% of an antioxidant, 0.5% of a plant whitening compound, 0.3% of phenylethyl resorcinol, 2% of palmetto leaf extract, 0.1% of bisabolol, 2% of beta-glucan, 0.5% of panthenol, 0.3% of a preservative, 2% of a polymer humectant, a proper amount of an acid-base regulator and the balance of deionized water.

In the formula of the embodiment, the emulsifier is polyglycerol-4 stearate, the viscosity regulator is acryloyl dimethyl ammonium taurate/behenyl alcohol polyether-25 methacrylate cross-linked polymer, the antioxidant is butyl hydroxy anisole, the polymer humectant is PEG/PPG/polytetramethylene glycol-8/5/3 glycerin, the preservative is phenoxyethanol, and the pH regulator is citric acid.

The embodiment also provides a preparation method of the high-safety whitening essence milk with the dual effects of moisturizing and whitening, which comprises the following steps:

1) adding hyaluronic acid, xanthan gum and Arabic gum into glycerol and glyceryl polyether-26, and premixing to obtain mixed dispersion;

2) adding the mixed dispersion into a water phase kettle filled with water under the condition of stirring, stirring and heating to 80 ℃, and preserving heat for half an hour to obtain a water phase mixture;

3) uniformly stirring and mixing an emulsifier, a viscosity regulator, squalane, isononyl isononanoate, tocopherol and an antioxidant in an oil phase kettle, heating to 80 ℃, and completely dissolving to obtain an oil phase mixture;

4) adding the oil-phase mixture obtained in the step 3) into the water-phase mixture obtained in the step 2) while the oil-phase mixture is hot, keeping the temperature at 80 ℃, preparing the oil phase and the water phase into uniform emulsion by using a vacuum emulsifying machine, and slowly stirring and cooling;

5) uniformly mixing phenethyl resorcinol and butanediol, and stirring and dissolving at 42 ℃ to obtain a dispersion liquid;

6) and (3) cooling the emulsion in the step 4) to 45 ℃, then sequentially adding the dispersion liquid in the step 5), the plant whitening compound, the palmleaf tree extract, the bisabolol, the beta-glucan, the panthenol, the polymer humectant, the proper amount of the acid-base regulator and the preservative, and continuously stirring and cooling to 35 ℃ to obtain the high-safety whitening essence emulsion with the dual effects of moisturizing and whitening.

Example 2

The embodiment provides a whitening essence milk, which has the following formula:

5% of glycerin, 3% of butanediol, 262% of glyceryl polyether, 0.3% of gum arabic, 0.3% of sodium hyaluronate, 2.5% of an emulsifier, 0.5% of a viscosity regulator, 2% of squalane, 2% of isononyl isononanoate, 2% of diethylhexyl carbonate, 1.5% of tocopherol, 0.2% of an antioxidant, 1% of a plant whitening compound, 0.5% of phenylethylresorcinol, 5% of a palm leaf extract, 2% of a portulaca oleracea extract, 3% of beta-glucan, 0.8% of panthenol, 0.6% of a preservative, 1% of a polymer humectant, a proper amount of an acid-base regulator and the balance of deionized water.

In the formula of the embodiment, the emulsifier is polyglycerol-4 oleate, the viscosity regulator is acryloyl dimethyl ammonium taurate/behenyl alcohol polyether-25 methacrylate cross-linked polymer, the antioxidant is tert-butyl hydroquinone, the preservative is phenoxyethanol, the polymer humectant is a mixture of PEG/PPG/-17/6 copolymer and sodium polyglutamate in equal mass, and the acid-base regulator is citric acid.

The embodiment also provides a preparation method of the whitening essence milk, which comprises the following steps:

1) adding hyaluronic acid and gum arabic into glycerol and glyceryl polyether-26, and premixing to obtain mixed dispersion;

2) adding the mixed dispersion into a water phase kettle filled with water under the condition of stirring, stirring and heating to 85 ℃, and preserving heat for half an hour to obtain a water phase mixture;

3) uniformly stirring and mixing an emulsifier, a viscosity regulator, squalane, isononyl isononanoate, diethylhexyl carbonate, tocopherol and an antioxidant in an oil phase kettle, heating to 80 ℃, and completely dissolving to obtain an oil phase mixture;

4) adding the oil-phase mixture obtained in the step 3) into the water-phase mixture obtained in the step 2) while the oil-phase mixture is hot, keeping the temperature at 75 ℃, preparing the oil phase and the water phase into uniform emulsion by using a vacuum emulsifying machine, and slowly stirring and cooling.

5) And uniformly mixing phenethyl resorcinol and butanediol, and stirring and dissolving at 45 ℃ to obtain a dispersion liquid.

6) And (3) cooling the emulsion in the step 4) to 42 ℃, then sequentially adding the dispersion liquid in the step 5), the plant whitening compound, the palmleaf tree extract, the bisabolol, the beta-glucan, the panthenol, the polymer humectant, the proper amount of the acid-base regulator and the preservative, and continuously stirring and cooling to 33 ℃, thus obtaining the whitening essence emulsion with the dual effects of moisturizing and whitening and high safety.

Example 3

The embodiment provides a whitening essence milk and a preparation method thereof, wherein the formula of the whitening essence milk comprises the following components:

3% of glycerol; 4% of butanediol; 263% of glycerol polyether; 0.2% of xanthan gum; 0.1% of Arabic gum; 0.2 percent of sodium hyaluronate; 2% of an emulsifier; 0.6 percent of viscosity regulator; 3% of squalane; isononyl isononanoate 2%; (ii) a 2% of diethyl hexyl carbonate; 0.5 percent of tocopherol; 0.3 percent of antioxidant; the plant whitening compound is 0.5 percent; 0.5% of phenethyl resorcinol; palm leaf tree extract 3%, bisabolol 0.2%, beta-glucan 3%; 0.5 percent of panthenol; 0.5 percent of preservative; 1% of a polymer humectant; a proper amount of acid-base regulator; the balance of deionized water.

In the formula of the embodiment, the emulsifier is a mixture of polyglycerol-3-methylglucadiate and glyceryl monostearate in a weight ratio of 3:1, the viscosity regulator is an ammonium acryloyl dimethyl taurate/VP copolymer, the antioxidant is bis-ethylhexyloxyphenol methoxyphenyl triazine, the preservative is octyl glycol, and the acid-base regulator is sodium hydroxide.

The embodiment also provides a preparation method of the whitening essence milk with moisturizing effect and high safety, which comprises the following steps:

1) adding hyaluronic acid, xanthan gum and Arabic gum into glycerol and glyceryl polyether-26, and premixing to obtain mixed dispersion.

2) Adding the mixed dispersion into a water phase kettle filled with water under the condition of stirring, stirring and heating to 83 ℃, and preserving heat for half an hour to obtain a water phase mixture;

3) uniformly stirring and mixing an emulsifier, a viscosity regulator, squalane, isononyl isononanoate, tocopherol and an antioxidant in an oil phase kettle, heating to 80 ℃, and completely dissolving to obtain an oil phase mixture;

4) adding the oil-phase mixture obtained in the step 3) into the water-phase mixture obtained in the step 2) while the oil-phase mixture is hot, keeping the temperature at 78 ℃, preparing the oil phase and the water phase into uniform emulsion by using a vacuum emulsifying machine, and slowly stirring and cooling.

5) And uniformly mixing phenethyl resorcinol and butanediol, and stirring and dissolving at 43 ℃ to obtain a dispersion liquid.

6) And (3) cooling the emulsion in the step 4) to 43 ℃, then sequentially adding the dispersion liquid in the step 5), the plant whitening compound, the palmleaf tree extract, the bisabolol, the beta-glucan, the panthenol, the polymer humectant, a proper amount of the acid-base regulator and the preservative, and continuously stirring and cooling to 34 ℃ to obtain the whitening essence emulsion with dual effects of moisturizing and whitening and high safety.

Effect verification:

1. moisture retention test

The test principle is as follows: the water content of the horny layer of the human skin is tested by a capacitance method by using a human skin tester. The moisturizing ability of the product was evaluated by measuring the change in the water content of the stratum corneum of the skin before and after the use of the product in example 3 in volunteers.

The test method comprises the following steps: 20 volunteers aged 25-35 years were selected and used the same amount of the product obtained in example 3 in the area fixed on the inner side of both arms, the amount being the same as 2 mg/cm²The moisture content of the volunteers before and after use is tested by using a human skin tester, and the moisture retention performance of the product is evaluated by taking an average value. The test results are shown in table 1 below.

Table 1 example 3 product moisture retention test

As can be seen from table 1 above, the product provided in example 3 can significantly increase skin moisture, thereby increasing skin transdermal absorption, promoting penetration of whitening active substances, and increasing bioavailability of the active substances.

Test of whitening Effect

The test principle is as follows: the whitening effect of the product was evaluated by testing the amount of melanin change in the skin before and after the use of the product by volunteers using a human skin tester MAP580 based on the principle of spectral absorption.

The experimental method comprises the following steps: 15 volunteers aged 25-35 years were selected and the same amount of the product prepared in example 3 was used in the same amount of 2 mg/cm in the area fixed on the inner side of both arms²The skin whitening lotion is used once in the morning and at night every day for 28 days continuously, the skin melanin content of the volunteers on the 0 th day, the 10 th day, the 20 th day and the 28 th day and the blank skin melanin content are tested by using a human skin tester, and the skin whitening effect of the product is evaluated by taking the average value. The test results are shown in table 2 below.

Table 2 whitening effect test of the product of example 3

As can be seen from Table 2, the skin melanin reduction rate reaches 20.4% after the product of example 3 is continuously used for 28 days, which shows that the product of example 3 has a better whitening effect.

Safety test

The skin irritation of the products of examples 1 to 3 was investigated according to the skin irritation test of the cosmetic safety specifications 2015 edition, and the results were as follows:

as can be seen from the above table, there is no significant difference in all examples. The difference between the average scores of the test sample and the solvent control is not more than 1.0, which meets the national standard. EXAMPLES 1-3 the product was non-irritating to rabbit skin.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims (10)

1. The whitening essence milk is characterized by being prepared from the following components in percentage by weight: 2-5% of glycerin, 2-5% of butanediol, 262-5% of glyceryl polyether, 0-0.2% of xanthan gum, 0-0.3% of gum arabic, 0.1-0.3% of sodium hyaluronate, 1-3% of an emulsifier, 0-1.5% of a viscosity regulator, 0-5% of squalane, 0-5% of isononyl isononanoate, 0-5% of diethylhexyl carbonate, 0.1-1.5% of tocopherol, 0.1-0.3% of an antioxidant, 0.5-2% of a plant compound, 0.1-0.5% of phenylethyl resorcinol, 1-5% of a palm leaf extract, 0-0.3% of bisabolol, 0-3% of a portulaca oleracea extract, 1-5% of beta-glucan, 0-1.0% of panthenol, 0.3-2.0% of a preservative, 1-5% of a polymer humectant and 0-1% of an acid-base regulator.

2. The whitening essence milk according to claim 1, characterized in that: the molecular weight range of the sodium hyaluronate is 0.8-30 ten thousand.

3. The whitening essence milk according to claim 1, characterized in that: the emulsifier is one or more of glyceryl monostearate, polyglycerol-3-methyl glucose distearate, alkyl glucoside and fatty acid ester thereof, and polyether surfactant.

4. The whitening essence milk according to claim 1, characterized in that: the viscosity regulator consists of an acrylate polymer or an acrylic polymer; the acrylic ester polymer is selected from an acryloyl dimethyl ammonium taurate/behenyl polyether-25 methacrylate cross-linked polymer; the acrylic polymer is selected from the group consisting of ammonium acryloyldimethyltaurate/VP copolymers.

5. The whitening essence milk according to claim 1, characterized in that: the antioxidant is one or a plurality of 2, 6-di-tert-butyl-4-methylphenol, butyl hydroxy anisole, tert-butyl hydroquinone and bis-ethylhexyloxyphenol methoxyphenyl triazine.

6. The whitening essence milk according to claim 1, characterized in that: the plant whitening compound comprises a glycyrrhiza glabra extract, marshmallow, rice chaff and rapeseed oil.

7. The whitening essence milk according to claim 1, wherein the preservative comprises one or more of phenoxyethanol, 1, 2-octanediol, 1, 2-decanediol, p-hydroxyacetophenone, ethylhexylglycerin, methylparaben, ethylparaben, propylparaben, caprylhydroxamic acid, benzoic acid, and benzyl alcohol.

8. The whitening essence milk according to claim 1, wherein the polymer humectant comprises one or any combination of PEG/PPG/polytetramethylene glycol-8/5/3 glycerin, PEG/PPG/-17/6 copolymer, acrylic acid/MA copolymer sodium, methyl glucitol polyether-10 and polyglutamate sodium.

9. The whitening essence milk according to claim 1, wherein the pH regulator comprises one or any combination of sodium hydroxide, potassium hydroxide, triethanolamine, citric acid and salts thereof.

10. The method for preparing the whitening essence milk according to claim 1, comprising the steps of:

1) adding hyaluronic acid, xanthan gum and Arabic gum into glycerol and glyceryl polyether-26, and premixing to obtain mixed dispersion;

2) adding the mixed dispersion into a water phase kettle filled with water under the condition of stirring, stirring and heating to 75-85 ℃, and preserving heat for half an hour to obtain a water phase mixture;

3) uniformly stirring and mixing an emulsifier, a viscosity regulator, squalane, isononyl isononanoate, diethylhexyl carbonate, tocopherol and an antioxidant in an oil phase kettle, heating to 80 ℃, and completely dissolving to obtain an oil phase mixture;

4) adding the oil phase mixture obtained in the step 3) into the water phase mixture obtained in the step 2), keeping the temperature at 75-80 ℃, preparing the oil phase and the water phase into uniform emulsion by using a vacuum emulsifying machine, and slowly stirring and cooling;

5) uniformly mixing phenethyl resorcinol and butanediol, and stirring and dissolving at 40-45 ℃ to obtain a dispersion liquid;

6) and (3) cooling the emulsion in the step 4) to 40-45 ℃, then sequentially adding the dispersion, the plant whitening compound, the palm tree extract, bisabolol, the purslane extract, beta-glucan, panthenol, the polymer humectant, the acid-base regulator and the preservative in the step 5), and continuously stirring and cooling to 30-35 ℃ to obtain the whitening essence emulsion.

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