Skin brightening liquid and preparation method thereof

Abstract

The invention discloses a skin brightening liquid and a preparation method thereof, and belongs to the technical field of cosmetic preparation. The skin brightening liquid comprises the following raw materials in percentage by mass: 2-20% of a brightening agent, 1-10% of a humectant, 1-8% of a first solubilizer, 1-10% of a second solubilizer, 0.5-2% of a preservative, 0.05-0.2% of an odorant and the balance of water, wherein the brightening agent is prepared from polyglycerol polyricinoleate, a dendrobium officinale stem extract and coconut oil alcohol acid ester according to the mass ratio of (1 to 10) to (1 to 5) to (1 to 5). According to the skin brightening liquid disclosed by the invention, the polyglycerol polyricinoleate, the dendrobium officinale stem extract and the coconut oil alcohol acid in a specific ratio are selected as brighteners, and the three components have a synergistic effect, so that a bright layer can be quickly formed on the surface of skin, and the glossiness of the skin is improved. After the product is used, the glossiness (GL value) of the skin can be improved by 25-30% in a short time, and the effect is remarkable and lasting.

Description

Technical Field

[0001] The invention relates to the technical field of cosmetic preparation, and in particular to a skin brightening liquid and a preparation method thereof. Background Art

[0002] As people's demand for beauty and skin care grows, improving skin brightness has become the pursuit of many consumers. There are many products on the market that can improve skin brightness, but most of them are not effective enough or take a long time to take effect. Therefore, developing a product that can instantly improve skin brightness and has obvious effects has become an urgent need in the current beauty field. Summary of the invention

[0003] The object of the present invention is to provide a skin brightening liquid and a preparation method thereof, which can effectively improve skin brightness and have the advantage of long makeup lasting time.

[0004] In order to achieve the above-mentioned object, in a first aspect, the present invention provides a skin brightening liquid, which comprises the following raw materials, by mass percentage: 2-20% of a brightening agent, 1-10% of a moisturizing agent, 1-8% of a first solubilizing agent, 1-10% of a second solubilizing agent, 0.5-2% of a preservative, 0.05-0.2% of a fragrance agent, and the balance is water;

[0005] The brightener comprises polyglycerol polyricinoleate, Dendrobium officinale stem extract and coconut oil alcoholate in a mass ratio of (1-10):(1-5):(1-5).

[0006] Compared with the prior art, the skin brightening liquid of the present invention comprises a brightening agent, wherein the brightening agent is selected from polyglycerol polyricinoleate, Dendrobium officinale stem extract and coconut oil alcohol acid ester in a specific ratio, and the three act synergistically to quickly form a brightening layer on the skin surface and improve the glossiness of the skin. In addition, according to the different solubility properties of polyglycerol polyricinoleate, Dendrobium officinale stem extract and coconut oil alcohol acid ester, by setting a first solubilizing agent and a second solubilizing agent, the first solubilizing agent and the second solubilizing agent can improve the solubility and stability of polyglycerol polyricinoleate, Dendrobium officinale stem extract and coconut oil alcohol acid ester, thereby solving the problem in the prior art that polyglycerol polyricinoleate is not stable in water and Dendrobium officinale stem extract is not easy to dissolve, and solving the problem in the prior art that polyglycerol polyricinoleate is more unstable in water after directly adding glycerol or alcohol. The present invention mixes the brightener, moisturizer, solubilizer, preservative and fragrance agent in a specific ratio. The moisturizer has a moisturizing and nourishing effect on the skin, and can cooperate with the brightener to further improve the glossiness of the skin; and the two solubilizers can make each component dispersed evenly in the skin brightening liquid, thereby improving the stability of the skin brightening liquid and making the effectiveness of the skin brightening liquid last longer. After using this product, the glossiness (GL value) of the skin can be increased by 25-30% in a short time, and the effect is significant and lasting.

[0007] Furthermore, the polyglycerol polyricinoleate is polyglycerol-6 polyricinoleate or polyglycerol-4 polyricinoleate; the Dendrobium officinale stem extract is an ultra-low molecular weight Dendrobium officinale stem extract with a molecular weight of 2000Da to 5000Da; and the coconut oil ester is coconut oil caprylate or coconut oil caprate.

[0008] Furthermore, the esterification degree of polyglycerol-6 polyricinoleate is 32-50, and the esterification degree of polyglycerol-4 polyricinoleate is 35-50.

[0009] Compared with the prior art, the esterification degree of polyglycerol polyricinoleate in the prior art is generally selected to be not less than 10 and not more than 30. The inventors have found through research that the present invention selects polyglycerol-6 polyricinoleate and polyglycerol-4 polyricinoleate with an esterification degree greater than 30, especially selects polyglycerol-6 polyricinoleate with an esterification degree of 32-50 and polyglycerol-4 polyricinoleate with an esterification degree of 35-50. Under the above-mentioned specific esterification degree, in combination with specific moisturizers and solubilizers, the brightening effect of the brightening liquid can be greatly improved, and the glossiness of the skin can be significantly improved.

[0010] Furthermore, the moisturizer includes any one or more of lactobacillus fermentation lysate, tremella extract, 1,3-propylene glycol, tocopherol (vitamin E), propylene carbonate, and glycerin.

[0011] Furthermore, the first solubilizer includes any one or more of polyglyceryl-10 myristate, polyglyceryl-10 isostearate, and polyglyceryl-10 laurate, and the second solubilizer includes any one or more of ethanol, glycerol, and propylene glycol.

[0012] Compared with the prior art, the present invention selects a specific first solubilizing agent and a second solubilizing agent composition, and polyglyceryl-10 myristate, polyglyceryl-10 isostearate, and polyglyceryl-10 laurate can have a good solubilizing effect on polyglyceryl polyricinoleate and coconut oil alcohol acid ester, greatly improving the solubility and stability of polyglyceryl polyricinoleate and coconut oil alcohol acid ester, and selecting ethanol, glycerol, and propylene glycol as the second solubilizing agent can further improve the solubility and stability of polyglyceryl polyricinoleate and coconut oil alcohol acid ester, and finally improve the solubility of the Dendrobium officinale stem extract. The present invention can greatly improve the solubility and stability of the brightener by selecting different solubilizing agents, so that the prepared brightening liquid has an excellent and lasting effect of improving the glossiness of the skin.

[0013] Furthermore, the preservative includes any one or more of phenoxyethanol, 1,2-hexanediol, 1,2-pentanediol, caprylhydroxamic acid, and o-cymene-5-ol.

[0014] Furthermore, the perfume comprises lavender oil.

[0015] In a second aspect, the present invention further provides a method for preparing a skin lightening liquid, which is applied to the above-mentioned skin lightening liquid and comprises the following steps:

[0016] According to the above ratio, polyglycerol polyricinoleate, the first solubilizer, and coconut oil alcoholate are mixed, the temperature is raised to 45-55° C., and stirred and dispersed until uniform to obtain a first mixture;

[0017] After cooling the first mixture to below 45° C., adding a flavoring agent, a preservative and the first portion of water thereto, and continuing to stir and disperse until the system becomes transparent;

[0018] Add the second solubilizing agent and the second portion of water under stirring, and stir until the system is uniform to obtain a second mixture;

[0019] Mixing the Dendrobium officinale stem extract, the moisturizer, and the remaining water to obtain a third mixture;

[0020] The third mixture is added to the second mixture, and stirred continuously to obtain a finished product.

[0021] In the above preparation steps, the stirring rate is preferably 30-50 rpm.

[0022] Compared with the prior art, in the preparation method of the skin brightening liquid of the present invention, polyglycerol polyricinoleate, the first solubilizer, and coconut oil alcohol ester are first mixed according to a ratio, and the temperature is raised to 45-55° C. and stirred evenly to obtain a first mixture. By first mixing the first solubilizer with polyglycerol polyricinoleate and coconut oil alcohol ester, the solubility of polyglycerol polyricinoleate and coconut oil alcohol ester can be improved, and a first mixture with good dissolution effect and uniform mixing can be obtained. Then the first mixture is cooled to below 45°C, a flavoring agent, a preservative and the first part of water are added, and stirring and dispersing is continued until the system becomes transparent. Through this step, the first mixture is first mixed with the first part of water, the flavoring agent and the preservative, and a mixture solution of a transparent system is obtained by stirring. This step enables the above components to be dispersed more evenly and can greatly improve the stability of the system, which is crucial for the subsequent improvement of the brightening effect; then the second solubilizer and the second part of water are added to the above transparent system, and stirring is continued to obtain a second mixture with a uniform and stable system, which can effectively solve the problem of the prior art that directly adding glycerin or alcohol leads to worse stability of polyglycerol polyricinoleate; finally, the third mixture obtained by stirring the Dendrobium officinale stem extract, the humectant and the remaining part of water is added to the second mixture and stirred evenly to obtain a finished product. By mixing the components in the above-mentioned specific order and in coordination with the change of specific temperature, the components such as polyglycerol polyricinoleate, coconut oil glycolate, fragrance agent, preservative, etc. can be fully and evenly mixed, especially for polyglycerol polyricinoleate, it can be evenly and stably dispersed in the skin brightening liquid, thereby synergizing with the Dendrobium officinale stem extract and coconut oil glycolate to further enhance the glossiness of the skin and prolong the action time of the brightening agent.

[0023] Further, adding a flavoring agent, a preservative and a portion of water thereto, and continuing to stir and disperse until the system becomes transparent comprises: adding a flavoring agent and a preservative to the first mixture cooled to below 45° C., continuing to stir and disperse until uniform, and then slowly adding the first portion of water, and continuing to stir until the system becomes transparent. Optionally, the slow dripping rate of the first portion of water is 10-20 g / min.

[0024] Compared with the prior art, this step first cools the first mixture to below 45°C, then adds the flavoring agent and preservative and continues to stir, so that the above components can be evenly mixed and dispersed, and then the first part of water is slowly added to the above system by controlling the addition speed, and a transparent system can be obtained by continuous stirring. This system can ensure that the components are more evenly dispersed and can greatly improve the stability of the system, which is crucial for the subsequent acquisition of a brightening liquid with a brightening effect.

[0025] Furthermore, the first portion of water accounts for 5-20 wt % of the total water, the second portion of water accounts for 10-30 wt % of the total water, and the remainder is the remaining water.

[0026] Compared with the prior art, by limiting the amount of water added in each part, it is possible to ensure that each component is dispersed evenly and obtain a brightening liquid product with excellent effects. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] In a first aspect, an embodiment of the present invention provides a skin brightening liquid, which comprises the following raw materials, measured in mass percentage: 2-20% of a brightening agent, 1-10% of a moisturizing agent, 1-8% of a first solubilizing agent, 1-10% of a second solubilizing agent, 0.5-2% of a preservative, 0.05-0.2% of a fragrance agent, and the remainder being water.

[0029] For example, in the above-mentioned skin brightening liquid, the content of the brightening agent, by mass percentage, can be 2%, 5%, 10%, 15% or 20%; the content of the moisturizing agent can be 1%, 2%, 4%, 6%, 8% or 10%; the content of the first solubilizing agent can be 1%, 2%, 4%, 6% or 8%; the content of the second solubilizing agent can be 1%, 2%, 4%, 6%, 8% or 10%; the content of the preservative can be 0.5%, 1%, 1.5% or 2%; the content of the flavoring agent can be 0.05%, 0.1%, 0.15% or 0.2%; and the balance is water.

[0030] Wherein, the brightener comprises polyglycerol polyricinoleate, Dendrobium officinale stem extract and coconut oil glycolate in a mass ratio of (1-10):(1-5):(1-5). For example, the mass ratio of polyglycerol polyricinoleate, Dendrobium officinale stem extract and coconut oil glycolate can be 1:1:1, 1:5:5, 5:2:3 or 10:5:5.

[0031] The above technical solution combines polyglycerol polyricinoleate, Dendrobium officinale stem extract and coconut oil glycolate as the brightener in the skin brightening liquid. Within the above specific mass ratio range, polyglycerol polyricinoleate, Dendrobium officinale stem extract and coconut oil glycolate work synergistically to quickly form a brightening layer on the skin surface, thereby improving the glossiness of the skin. In addition, polyglycerol polyricinoleate, Dendrobium officinale stem extract and coconut oil glycolate can be stably and evenly dispersed in the skin brightening liquid under the action of the first solubilizer and the second solubilizer, solving the problem of poor stability of polyglycerol polyricinoleate in water and poor solubility of Dendrobium officinale stem extract in the prior art, thereby ensuring the stability of the skin brightening liquid and prolonging the action time of the skin brightening liquid, so that the skin brightening liquid of the present invention has the advantages of long-lasting effect and long makeup holding time.

[0032] Further, based on the above embodiments, the embodiments of the present invention define polyglycerol polyricinoleate as polyglycerol-6 polyricinoleate or polyglycerol-4 polyricinoleate; Dendrobium officinale stem extract is an ultra-low molecular Dendrobium officinale stem extract with a molecular weight of 2000Da to 5000Da; and coconut oil alcohol ester is coconut oil alcohol-caprylate or coconut oil alcohol-caprate. For example, the molecular weight of the Dendrobium officinale stem extract can be 2000Da, 3000Da, 4000Da or 5000Da.

[0033] The above technical scheme further defines the specific components of polyglycerol polyricinoleate, the molecular weight of Dendrobium officinale stem extract, and the specific components of coconut oil ester. The synergistic effect of polyglycerol polyricinoleate, Dendrobium officinale stem extract and coconut oil ester with the above specific components or molecular weights is better, which can further improve the glossiness of the skin.

[0034] Further, based on the above embodiment, the embodiment of the present invention limits the esterification degree of polyglycerol-6 polyricinoleate to 32-50, and the esterification degree of polyglycerol-4 polyricinoleate to 35-50. For example, the esterification degree of polyglycerol-6 polyricinoleate can be 32, 35, 40, 45 or 50, preferably 32-45; the esterification degree of polyglycerol-4 polyricinoleate can be 35, 40, 45 or 50, preferably 35-40.

[0035] The inventors found that when the polyglycerol polyricinoleate in the brightener has a high degree of esterification, the polyglycerol polyricinoleate with a high degree of esterification works synergistically with the Dendrobium officinale stem extract and coconut oil glycolate to significantly improve the glossiness of the skin and has a significant and lasting effect.

[0036] Further, based on the above embodiments, the embodiments of the present invention define the moisturizer to include any one or more of lactobacillus fermentation lysate, tremella extract, 1,3-propylene glycol, tocopherol (vitamin E), propylene carbonate, and glycerin.

[0037] The above technical solution defines the specific ingredients of the moisturizer. The above specific ingredients can moisturize and nourish the skin and maintain the moisture of the skin. On the one hand, they can enhance the effect of the brightener in enhancing the glossiness of the skin. On the other hand, they can also improve the skin condition and make it smoother and more delicate.

[0038] Further, based on the above embodiments, the embodiments of the present invention define the first solubilizer to include any one or more of polyglyceryl-10 myristic acid ester, polyglyceryl-10 isostearate, and polyglyceryl-10 laurate, and the second solubilizer to include any one or more of ethanol, glycerol, and propylene glycol.

[0039] Under the combined action of the first solubilizer and the second solubilizer of the above-mentioned specific ingredients, polyglycerol polyricinoleate and coconut oil glycolate can be more evenly and stably dissolved and dispersed in the skin brightening liquid, so that polyglycerol polyricinoleate, Dendrobium officinale stem extract and coconut oil glycolate can better play a synergistic role in the skin brightening liquid, further improve the glossiness of the skin, and prolong the action time of the brightening agent.

[0040] Further, based on the above embodiments, the embodiments of the present invention define the preservative to include any one or more of phenoxyethanol, 1,2-hexanediol, 1,2-pentanediol, caprylhydroxamic acid, and o-cymene-5-ol.

[0041] The specific preservative in the above technical solution can prevent the growth and reproduction of harmful microorganisms, increase the shelf life of the skin lightening liquid, and protect the health of users.

[0042] Further, based on the above embodiment, the embodiment of the present invention limits the flavoring agent to include lavender oil.

[0043] The lavender oil in the above technical solution can produce a unique fresh and soothing aroma, enhance the attractiveness of the product, and make the user feel happy and relaxed during use.

[0044] In a second aspect, an embodiment of the present invention further provides a method for preparing a skin lightening liquid, which is applied to the above-mentioned skin lightening liquid and comprises the following steps:

[0045] S1. According to the above ratio, polyglycerol polyricinoleate, the first solubilizer and coconut oil glycolate are mixed, the temperature is raised to 45-55° C., and stirred and dispersed until uniform to obtain a first mixture.

[0046] For example, in the above steps, the temperature may be raised to 45° C., 50° C. or 55° C. The stirring rate after the temperature is raised may be 30-50 rpm.

[0047] In the above step, the first solubilizer is mixed with polyglycerol polyricinoleate and coconut oil alcoholate, and the mixture is heated to 45-55° C. and then stirred, so as to improve the solubility of polyglycerol polyricinoleate and coconut oil alcoholate, thereby obtaining a first mixture with good dissolution effect and uniform mixing.

[0048] S2. After cooling the first mixture to below 45° C., add a flavoring agent, a preservative and the first portion of water thereto, and continue stirring and dispersing until the system becomes transparent.

[0049] Furthermore, in the above steps, flavoring agents and preservatives may be added thereto first, and stirring may be continued until they are uniformly dispersed. Then, the first portion of water may be slowly added thereto, and stirring may be continued until the system becomes transparent. The stirring rate may refer to step S1.

[0050] The first portion of water accounts for 5-20 wt% of the total water, and for example, may account for 5 wt%, 10 wt%, 15 wt% or 20 wt% of the total water. The first portion of water may be added at a rate of 10-20 g / min.

[0051] The above steps can obtain a mixture solution with a transparent system by cooling to below 45°C and controlling the addition rate of the first part of water. This system enables the above components to be dispersed more evenly and can greatly improve the stability of the system, which is crucial for the subsequent improvement of the brightening effect.

[0052] S3, adding the second solubilizing agent and the second portion of water under stirring, stirring until the system is uniform, to obtain a second mixture. The stirring rate can refer to step S1.

[0053] The second part of water in the above step accounts for 10-30wt% of the total water. For example, it can account for 10wt%, 15wt%, 20wt%, 25wt% or 30wt% of the total water.

[0054] The above steps can obtain a second mixture with a uniform and stable system, and polyglycerol polyricinoleate can be uniformly and stably present in the second mixture, effectively solving the problem in the prior art that directly adding glycerol or alcohol leads to worse stability of polyglycerol polyricinoleate.

[0055] S4, stirring the Dendrobium officinale stem extract, the moisturizer and the remaining water to obtain a third mixture. The stirring rate can refer to step S1.

[0056] S5, adding the third mixture to the second mixture, and continuing to stir evenly to obtain a finished product. The stirring rate can refer to step S1.

[0057] The above-mentioned ingredients are mixed according to the above-mentioned specific order of addition and specific temperature changes, so that the solubilizing effects of the first solubilizer and the second solubilizer can be fully exerted, so that the various components in the skin brightening liquid, especially polyglycerol polyricinoleate, can be evenly and stably dissolved in the skin brightening liquid, and with the synergistic cooperation of other ingredients, the glossiness of the skin is improved.

[0058] In order to better illustrate the technical solution of the present invention, the present invention also provides the following specific embodiments.

[0059] Embodiment 1

[0060] The embodiment of the present invention provides a skin brightening liquid, which comprises the following raw materials, by mass percentage: 2% of a brightening agent, 2% of a moisturizing agent, 1% of a first solubilizing agent, 1% of a second solubilizing agent, 0.5% of a preservative, 0.1% of a fragrance agent, and the balance is water.

[0061] Among them, the brightener is polyglycerol-6 polyricinoleate, ultra-low molecular weight Dendrobium officinale stem extract with a molecular weight of 3000Da and coconut oil monocaprylate in a mass ratio of 1:1:1, and the esterification degree of polyglycerol-6 polyricinoleate is 50; the moisturizer is lactobacillus fermentation lysate and Tremella fuciformis extract in a mass ratio of 1:1; the first solubilizer is polyglycerol-10 myristate; the second solubilizer is ethanol; the preservative is phenoxyethanol; and the fragrance agent is lavender oil.

[0062] The preparation method of the skin lightening liquid in this embodiment is as follows:

[0063] S1. According to the above ratio, polyglycerol polyricinoleate, the first solubilizer and coconut oil glycolate are mixed, the temperature is raised to 45° C., and stirred and dispersed until uniform to obtain a first mixture, and the stirring rate is 40 rpm.

[0064] S2. After cooling the first mixture to below 45°C, add a flavoring agent and a preservative thereto, continue stirring and dispersing until uniform, and then slowly add the first portion of water at a rate of 15 g / min, the first portion of water accounting for 5wt% of the total water volume, and continue stirring until the system becomes transparent, with a stirring rate of 40 rpm.

[0065] S3. Add the second solubilizing agent and the second portion of water under stirring, wherein the second portion of water accounts for 10 wt % of the total water, and stir until the system is uniform to obtain a second mixture. The stirring rate is 40 rpm.

[0066] S4. Evenly stir the Dendrobium officinale stem extract, the humectant and the remaining water to obtain a third mixture at a stirring rate of 40 rpm.

[0067] S5. Add the third mixture into the second mixture and continue stirring until uniform to obtain a finished product. The stirring rate is 40 rpm.

[0068] Embodiment 2

[0069] The embodiment of the present invention provides a skin brightening liquid, which comprises the following raw materials, by mass percentage: 10% of a brightening agent, 4% of a moisturizing agent, 4% of a first solubilizing agent, 6% of a second solubilizing agent, 1% of a preservative, 0.05% of a fragrance agent, and the balance being water.

[0070] Among them, the brightener is polyglycerol-4 polyricinoleate, ultra-low molecular weight Dendrobium officinale stem extract with a molecular weight of 2000Da and coconut oil monocaprate in a mass ratio of 1:5:5, and the esterification degree of polyglycerol-4 polyricinoleate is 50; the moisturizer is 1,3-propylene glycol and glycerol in a mass ratio of 2:1; the first solubilizer is polyglyceryl-10 isostearate; the second solubilizer is propylene glycol; the preservative is 1,2-hexanediol; and the fragrance agent is lavender oil.

[0071] A skin lightening liquid was prepared according to the method of Example 1, except that in step S1, the temperature was raised to 50°C; in step S2, the first portion of water accounted for 10 wt% of the total water; and in step S3, the second portion of water accounted for 20 wt% of the total water.

[0072] Embodiment 3

[0073] The embodiment of the present invention provides a skin brightening liquid, which comprises the following raw materials, by mass percentage: 15% of a brightening agent, 8% of a moisturizing agent, 6% of a first solubilizing agent, 8% of a second solubilizing agent, 2% of a preservative, 0.2% of a fragrance agent, and the balance is water.

[0074] Among them, the brightener is polyglycerol-6 polyricinoleate, ultra-low molecular weight Dendrobium officinale stem extract with a molecular weight of 5000Da and coconut oil-caprylate in a mass ratio of 5:2:3, and the esterification degree of polyglycerol-6 polyricinoleate is 32; the moisturizer is tocopherol and propylene carbonate in a mass ratio of 1:2; the first solubilizer is polyglycerol-10 laurate; the second solubilizer is glycerol; the preservative is caprylhydroxamic acid; and the fragrance agent is lavender oil.

[0075] A skin lightening liquid was prepared according to the method of Example 1, except that the temperature was raised to 55° C. in step S1; the first portion of water accounted for 20 wt % of the total water in step S2; and the second portion of water accounted for 30 wt % of the total water in step S3.

[0076] Embodiment 4

[0077] The embodiment of the present invention provides a skin brightening liquid, which comprises the following raw materials, by mass percentage: 20% of a brightening agent, 10% of a moisturizing agent, 8% of a first solubilizing agent, 10% of a second solubilizing agent, 1.5% of a preservative, 0.15% of a fragrance agent, and the balance is water.

[0078] Among them, the brightener is polyglycerol-4 polyricinoleate, ultra-low molecular weight Dendrobium officinale stem extract with a molecular weight of 4000Da and coconut oil monocaprate in a mass ratio of 10:5:5, and the esterification degree of polyglycerol-4 polyricinoleate is 35; the moisturizer is lactobacillus fermentation lysate; the first solubilizer is polyglycerol-10 isostearate; the second solubilizer is glycerol; the preservative is o-cymene-5-ol; and the flavoring agent is lavender oil.

[0079] A skin lightening liquid was prepared according to the method of Example 1, except that the temperature was raised to 50° C. in step S1; the first portion of water in step S2 accounted for 15 wt % of the total water; and the second portion of water in step S3 accounted for 25 wt % of the total water.

[0080] Embodiment 5

[0081] The embodiment of the present invention provides a skin brightening liquid, which comprises the following raw materials, by mass percentage: 5% of a brightening agent, 1% of a moisturizing agent, 2% of a first solubilizing agent, 2% of a second solubilizing agent, 1% of a preservative, 0.1% of a fragrance agent, and the balance is water.

[0082] Among them, the brightener is polyglycerol-6 polyricinoleate in a mass ratio of 5:2:3, ultra-low molecular weight Dendrobium officinale stem extract with a molecular weight of 2000Da and coconut oil monocaprylate, and the esterification degree of polyglycerol-6 polyricinoleate is 45; the moisturizer is Tremella fuciformis extract; the first solubilizer is polyglycerol-10 laurate; the second solubilizer is propylene glycol; the preservative is phenoxyethanol; and the fragrance agent is lavender oil.

[0083] A skin lightening liquid was prepared according to the method of Example 1, except that in step S2, the first portion of water accounted for 15 wt % of the total water; and in step S3, the second portion of water accounted for 20 wt % of the total water.

[0084] Embodiment 6

[0085] The embodiment of the present invention provides a skin brightening liquid, which comprises the following raw materials, by mass percentage: 15% of a brightening agent, 10% of a moisturizing agent, 4% of a first solubilizing agent, 4% of a second solubilizing agent, 1% of a preservative, 0.05% of a fragrance agent, and the balance is water.

[0086] Among them, the brightener is polyglycerol-4 polyricinoleate, ultra-low molecular weight Dendrobium officinale stem extract with a molecular weight of 3000Da and coconut oil monocaprate in a mass ratio of 10:5:5, and the esterification degree of polyglycerol-4 polyricinoleate is 40; the moisturizer is 1,3-propylene glycol; the first solubilizer is polyglycerol-10 myristate; the second solubilizer is glycerol; the preservative is 1,2-pentanediol; and the fragrance agent is lavender oil.

[0087] A skin lightening liquid was prepared according to the method of Example 1, except that the temperature was raised to 50° C. in step S1, the first portion of water accounted for 10 wt % of the total water in step S2, and the second portion of water accounted for 15 wt % of the total water in step S3.

[0088] Comparative Example 1

[0089] Compared with the skin brightening liquid provided in Example 4, the only difference is that an equal amount of polyglycerol-4 polyricinoleate is replaced by coconut oil alcohol monocaprate, and the other compositions and preparation methods remain unchanged.

[0090] Comparative Example 2

[0091] Compared with the skin brightening liquid provided in Example 4, the only difference is that an equal amount of coconut oil alcohol-caprate is replaced by polyglycerol-4 polyricinoleate, and the other compositions and preparation methods remain unchanged.

[0092] Comparative Example 3

[0093] Compared with the skin brightening liquid provided in Example 4, the only difference is that the ultra-low molecular weight Dendrobium officinale stem extract with a molecular weight of 4000Da is replaced by polyglycerol-4 polyricinoleate in an equal amount, and the other compositions and preparation methods remain unchanged.

[0094] Comparative Example 4

[0095] Compared with the skin brightening liquid provided in Example 4, the only difference is that the first solubilizing agent polyglyceryl-10 isostearate is replaced by glycerol in an equal amount.

[0096] Comparative Example 5

[0097] A skin lightening liquid was prepared according to the method of Example 4, except that the degree of esterification of polyglycerol-4 polyricinoleate was 20.

[0098] Comparative Example 6

[0099] A skin brightening liquid was prepared according to the method of Example 4, except that steps S1 and S2 were replaced by: polyglycerol polyricinoleate, the first solubilizer, coconut oil alcohol ester mixture, a fragrance, a preservative, and the first portion of water were directly mixed according to the ratio, the temperature was raised to 50° C., and the mixture was stirred until the system was uniform at a stirring rate of 40 rpm, and then the temperature was lowered to below 45° C., and step S3 was performed.

[0100] Comparative Example 7

[0101] The skin lightening liquid was prepared according to the method of Example 4, except that in step S2, when the first portion of water was added, it was not added slowly at a rate of 15 g / min, but was directly poured in completely.

[0102] Comparative Example 8

[0103] The ultra-low molecular weight Dendrobium officinale stem extract with a molecular weight of 4000Da in Example 4 was replaced by an equal amount of Dendrobium officinale stem extract with a molecular weight of 7000Da, and the other compositions and preparation methods remained unchanged.

[0104] Test Case

[0105] 140 female volunteers aged 20-30 were selected as subjects, and the skin of the subjects' test parts had no pigmentation, inflammation, scars, pigmented nevus, hirsutism, etc. The 140 subjects were divided into 14 groups, with 10 people in each group. The subjects in groups 1 to 6 were sprayed evenly on the facial skin surface with the skin brightening liquids in Examples 1 to 6, and the subjects in groups 7 to 14 were sprayed evenly on the facial skin surface with the skin brightening liquids in Comparative Examples 1 to 8.

[0106] A skin gloss tester (Germany CK, GL200) was used to test the skin gloss (GL value) of the above groups of subjects before using the product (0 min), immediately after using the product (3 min), 3 h, and 6 h, and the average value of each group of data was recorded. The results are shown in Table 1.

[0107] Skin glossiness change rate (%) = (T n -T0) / T0*100%, T0 is the skin glossiness of the subject before using the product, T n This is the skin glossiness of the subjects immediately after using the product.

[0108] Table 1

[0109] 0min 3min(immediately) 3h 6h Skin glossiness change rate (%) Embodiment 1 7.30 9.24 9.01 8.56 26.58％ Embodiment 2 7.45 9.48 9.27 8.67 27.25％ Embodiment 3 7.28 9.39 9.15 8.77 28.98％ Embodiment 4 7.42 9.54 9.33 8.91 28.57％ Embodiment 5 7.22 9.27 9.05 8.73 28.39％ Embodiment 6 7.34 9.43 9.24 8.85 28.47％ Comparative Example 1 7.46 8.45 8.02 7.86 13.27％ Comparative Example 2 7.31 8.32 8.01 7.75 13.82％ Comparative Example 3 7.24 8.34 7.96 7.66 15.19％ Comparative Example 4 7.35 8.76 8.41 8.04 19.18％ Comparative Example 5 7.47 8.90 8.63 8.13 19.14％ Comparative Example 6 7.23 8.30 8.12 7.78 14.80％ Comparative Example 7 7.41 8.44 8.06 7.82 13.90％ Comparative Example 8 7.33 8.38 8.07 7.85 14.32％

[0110] From the data in Table 1, it can be seen that in Comparative Example 1, an equal amount of polyglycerol-4 polyricinoleate is replaced with coconut oil alcohol-caprate, in Comparative Example 2, an equal amount of coconut oil alcohol-caprate is replaced with polyglycerol-4 polyricinoleate, and in Comparative Example 3, an equal amount of Dendrobium officinale stem extract is replaced with polyglycerol-4 polyricinoleate. After the subjects use the product, the skin glossiness at each time point decreases, indicating that the polyglycerol polyricinoleate, Dendrobium officinale stem extract and coconut oil alcohol ester in the present invention have a synergistic effect and can significantly improve the skin glossiness. In Comparative Example 4, after an equal amount of the first solubilizer polyglycerol-10 isostearic acid is replaced with glycerol, the skin glossiness at each time point after the subjects use the product decreases, indicating that the first solubilizer of the specific component of the present invention can greatly improve the solubility and stability of polyglycerol polyricinoleate and coconut oil alcohol ester, and after adding the second solubilizer, it can significantly improve the skin glossiness by acting together with the Dendrobium officinale stem extract. After the esterification degree of polyglycerol-4 polyricinoleate was changed in comparative example 5, the skin glossiness of the subjects at each time point after using the product decreased, indicating that the polyglycerol polyricinoleate with a specific esterification degree of the present invention can further improve the skin glossiness with the cooperation of other components. After the preparation method of the skin brightening liquid was changed in comparative example 6 and comparative example 7, the skin glossiness of the subjects at each time point after using the product decreased, indicating that the skin brightening liquid prepared by the specific preparation method of the present invention can make each component uniformly and stably dispersed in the brightening liquid, thereby achieving the effect of improving the skin glossiness. After the ultra-low molecular weight Dendrobium officinale stem extract with a molecular weight of 4000Da in Example 4 was replaced with an equal amount of Dendrobium officinale stem extract with a molecular weight of 7000Da, the skin glossiness of the subjects at each time point after using the product decreased, indicating that the ultra-low molecular weight Dendrobium officinale stem extract with a specific molecular weight of the present invention improves the skin glossiness with the cooperation of other components such as polyglycerol polyricinoleate and coconut oil alcohol ester.

[0111] In addition, most of the cosmetics for improving glossiness in the prior art contain freckle-removing ingredients, which remove freckles or fade melanin on the skin through long-term use, thereby improving the glossiness of the skin. However, the skin brightening liquid of the present application does not contain freckle-removing ingredients, and mainly improves the brightness of the skin through the compounding of the above-mentioned components. In addition, the skin brightening liquid can be sprayed on the skin surface by spraying, or applied to the skin surface by rubbing, which can instantly achieve the effect of improving the glossiness of the skin, and can maintain the glossiness of the skin for up to 3 to 6 hours.

[0112] The embodiments of the present disclosure are described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present disclosure. The scope of the present disclosure is defined by the appended claims and their equivalents. Without departing from the scope of the present disclosure, a person skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A skin lightening liquid, characterized in that: The composition comprises the following raw materials in percentage by mass: 2-20% of a brightener, 1-10% of a moisturizer, 1-8% of a first solubilizer, 1-10% of a second solubilizer, 0.5-2% of a preservative, 0.05-0.2% of a flavoring agent, and the balance is water; The brightener comprises polyglycerol polyricinoleate, Dendrobium officinale stem extract and coconut oil alcohol ester in a mass ratio of (1-10): (1-5): (1-5).

2. The skin lightening liquid according to claim 1, characterized in that: The polyglycerol polyricinoleate is polyglycerol-6 polyricinoleate or polyglycerol-4 polyricinoleate; the Dendrobium officinale stem extract is an ultra-low molecular Dendrobium officinale stem extract with a molecular weight of 2000Da to 5000Da; and the coconut oil ester is coconut oil alcohol-caprylate or coconut oil alcohol-caprate.

3. The skin lightening liquid according to claim 2, characterized in that: The esterification degree of the polyglycerol-6 polyricinoleate is 32-50, and the esterification degree of the polyglycerol-4 polyricinoleate is 35-50.

4. The skin lightening liquid according to any one of claims 1 to 3, characterized in that: The moisturizing agent includes any one or more of lactobacillus fermentation lysate, tremella extract, 1,3-propylene glycol, tocopherol, propylene carbonate, and glycerol.

5. The skin lightening liquid according to any one of claims 1 to 4, characterized in that: The first solubilizer includes any one or more of polyglyceryl-10 myristate, polyglyceryl-10 isostearate, and polyglyceryl-10 laurate, and the second solubilizer includes any one or more of ethanol, glycerol, and propylene glycol.

6. The skin lightening liquid according to any one of claims 1 to 5, characterized in that: The preservative includes any one or more of phenoxyethanol, 1,2-hexanediol, 1,2-pentanediol, caprylhydroxamic acid, and o-cymene-5-ol.

7. The skin lightening liquid according to any one of claims 1 to 6, characterized in that: The fragrance agent includes lavender oil.

8. A method for preparing a skin lightening liquid, applied to the skin lightening liquid according to any one of claims 1 to 7, characterized in that: The steps include: According to the above ratio, polyglycerol polyricinoleate, the first solubilizer, and coconut oil alcoholate are mixed, the temperature is raised to 45-55° C., and stirred and dispersed until uniform to obtain a first mixture; After cooling the first mixture to below 45° C., adding a flavoring agent, a preservative and the first portion of water thereto, and continuing to stir and disperse until the system becomes transparent; Add the second solubilizing agent and the second portion of water under stirring, and stir until the system is uniform to obtain a second mixture; Mixing the Dendrobium officinale stem extract, the moisturizer, and the remaining water to obtain a third mixture; The third mixture is added to the second mixture, and stirred continuously to obtain a finished product.

9. The preparation method according to claim 8, characterized in that: Add flavoring agent, preservative and part of water, continue to stir and disperse until the system becomes transparent: Add flavoring agent and preservative, continue stirring until dispersed evenly, then slowly add the first part of water, continue stirring until the system becomes transparent.

10. The preparation method according to claim 8 or 9, characterized in that: The first part of water accounts for 5-20 wt% of the total water, the second part of water accounts for 10-30 wt% of the total water, and the remainder is the remaining water.