An essence and a preparation method thereof

Abstract

The present application relates to the field of skin care products, in particular to a kind of essence and preparation method thereof.The method comprises the following steps: (1) mixing water, thickening agent and humectant, stirring at a temperature of 60-100 DEG C, to obtain phase A;The water gel formed by the thickening agent has a network structure;(2) oil is added to phase A, and is homogenized at 4500-8000r / min for 5-18min, to obtain phase B;(3) pH regulator is added to phase B, and the final product is obtained after stirring.The above preparation method is simple and convenient, and by using the thickening agent capable of forming a network structure water gel, and using suitable material mixing method in each step, the prepared essence has long time uniform and stable effect.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of skin care products, and more particularly relates to an essence and a preparation method thereof. BACKGROUND

[0002] Essences are mainly water-based, containing moisturizing ingredients and nutrients, so as to achieve the purposes of skin care, beauty, and improving the water retention and softness of the skin. In order to improve the moisturizing property and softness of the skin, oil is generally added to the essence, and the oil is in oil phase and is mixed with other water phase ingredients to form a microemulsion or a pure emulsion dosage form. Among them, the essence in pure emulsion dosage form is basically formed by rearranging the water-oil interface of water-soluble raw materials and oil-soluble raw materials through emulsifiers to form an oil-in-water form to ensure the stability of the product. Microemulsion mainly disperses and emulsifies a part of oil through the hydrophobicity of a large amount of thickening agent to disperse and emulsify the oil into small oil droplets in suspension, so as to have a certain stability in the aqueous system.

[0003] However, emulsifiers are added to the essence in pure emulsion dosage form, and the addition of emulsifiers increases the burden on sensitive skin and has certain safety risks. The essence in microemulsion dosage form has limited oil content, and delamination may occur under high temperature or long-term storage.

[0004] In summary, designing an essence product that does not introduce a large amount of emulsifiers and can stably suspend a large amount of oil helps to meet the safety and stability requirements of the product, enriches the skin feel of the essence, and facilitates the needs of consumers. SUMMARY

[0005] In view of the above defects and problems of the prior art, the present application develops an essence and a preparation method thereof.

[0006] The first aspect of the present application provides a preparation method of an essence, which comprises:

[0007] (1) mixing water, a thickening agent, and a humectant, and stirring at a temperature of 60-100℃ to obtain phase A; the hydrogel formed by the thickening agent has a network structure;

[0008] (2) adding oil to phase A and homogenizing at 4500-8000r / min for 5-18min to obtain phase B;

[0009] (3) adding a pH adjuster to phase B and stirring to obtain the final product.

[0010] Optionally, in step (2), homogenization is performed at 5800-7200r / min for 7-13min.

[0011] The applicant unexpectedly found that after the thickening agent capable of forming a network structure of hydrogel was uniformly dispersed in the A phase (aqueous phase), the oil was added to the A phase, and the oil was dispersed in the water phase containing the thickening agent by high-speed homogenization process at 4500-8000 r / min, the oil particles in the oil dispersed by the network structure of hydrogel formed by the thickening agent were suspended, even without the addition of emulsifier, the purpose of forming a uniform appearance of the essence liquid containing a large amount of oil was achieved, at this time, since the prepared essence liquid can not be separated and precipitated for a long time, it has safety and stability, which helps the essence liquid to play a role for a long time. The addition of pH adjuster can adjust the viscosity of the whole essence liquid, so that the viscosity of the essence liquid is moderate, thereby helping to enhance the force between the thickening agent and the oil particles, making the oil particles not easy to separate and aggregate, and also helping the whole essence liquid to have good fluidity to meet the use requirements.

[0012] In addition, the present application achieves the purpose of making the essence liquid containing oil components uniform and not stratified for a long time through the physical action between substances. Compared with the way of increasing a large amount of emulsifier or other chemical reagents, the essence liquid prepared by the present application is not easy to produce burden on sensitive skin, thereby improving the applicability of the essence liquid.

[0013] It should be noted that since the whole essence liquid is not easy to stratify by the way of suspending the oil particles by the network structure of hydrogel of the thickening agent, the substances in the whole essence liquid need to be uniformly dispersed, so that the thickening agent and the oil are fully dispersed in the whole essence liquid, thereby realizing the function of fully suspending the oil particles by the thickening agent; in addition, the whole essence liquid needs to have good care performance due to the uniform dispersion of various care ingredients, therefore, it is necessary to mix the substances as uniformly as possible during the preparation of the essence liquid. However, among various mixing methods of materials, the applicant also found that during the preparation of the essence liquid, the corresponding material mixing method needs to be adopted in each step to achieve better results. It should be noted that when the stirring method is adopted in step (1) and step (3), and the high-speed homogenization method is adopted in step (2), the prepared essence liquid has better uniformity and stability, which may be due to the fact that the above-mentioned material mixing method can maximize the structure of the thickening agent, effectively disperse the oil into many oil particles, and then fully suspend them in the network structure of hydrogel of the thickening agent, so that the thickening agent can fully play its role; it can also uniformly disperse the substances, improve the uniformity and stability of the essence liquid, and make the skin care substances evenly distributed.

[0014] Optionally, the thickening agent comprises one or more of acryloyl dimethyl ammonium taurate / vinyl pyrrolidone copolymer, polyacrylate crosspolymer-6, gelatin, acrylate crosspolymer, polyacryloyldimethyl sodium taurate.

[0015] Optionally, the thickening agent comprises an acrylate cross-linked polymer and a polyacryloyldimethyl taurate, wherein the mass ratio of the acrylate cross-linked polymer and the polyacryloyldimethyl taurate is 1:1.3-3.2; preferably, the mass ratio of the acrylate cross-linked polymer and the polyacryloyldimethyl taurate is 1:1.5-1.9.

[0016] It should be noted that the present application focuses on the fact that when the acrylate cross-linked polymer and the polyacryloyldimethyl taurate are used, the network structure formed by cross-linking the acrylate cross-linked polymer hydrogel and the polyacryloyldimethyl taurate has a relatively large strength. When these network structures are uniformly dispersed in the essence, the contact area between the network structures and the oil particles in the essence is increased, thereby achieving the purpose of fully suspending the oil particles. As a result, the oil particles in the essence can be uniformly distributed in the network structure formed by cross-linking the acrylate cross-linked polymer hydrogel and the polyacryloyldimethyl taurate, thereby achieving the purpose of making the entire essence uniform and stable. It is also inferred from the test data that, since the network structure formed by cross-linking the acrylate cross-linked polymer hydrogel and the polyacryloyldimethyl taurate has a relatively large strength and is not easily damaged, the essence prepared thereby can exist stably for a long time under various temperature conditions and centrifugal conditions, thereby further improving the stability of the essence.

[0017] Secondly, it is found through the tests of the present application that when the thickening agent comprises a mixture of an acrylate cross-linked polymer and a polyacryloyldimethyl taurate, and the addition amount of the acrylate cross-linked polymer is less than that of the polyacryloyldimethyl taurate, the essence prepared thereby can maintain good oil suspension under different temperatures and high-speed centrifugal conditions. Therefore, it can be concluded that when the addition amounts of the acrylate cross-linked polymer and the polyacryloyldimethyl taurate are appropriate, the effect of suspending the oil particles is good, and the stability of the prepared essence is also good.

[0018] Optionally, in step (1), the step of mixing water, a thickening agent and a humectant further comprises: uniformly spreading the thickening agent on the water surface, standing, and then adding the humectant while stirring after the thickening agent is completely immersed.

[0019] Stirring after the thickening agent is completely immersed helps to reduce the possibility of damaging the network structure of the thickening agent hydrogel and improve the performance of the thickening agent in suspending oil particles.

[0020] Optionally, the pH regulator is tromethamine or arginine; and the mass ratio of the pH regulator to the thickening agent is 1:0.4-0.8.

[0021] Optionally, by weight, the thickening agent is 0.1-0.8 parts; the humectant is 1-15 parts; the oil is 4-30 parts; the pH regulator is 0.05-0.7 parts; and the water is 60-85 parts.

[0022] When the thickening agent comprises a mixture of acrylate cross-linked polymer and polyacryloyl dimethyl sodium taurate, the acrylate cross-linked polymer is 0.05-0.4 parts by weight; the polyacryloyl dimethyl sodium taurate is 0.065-0.75 parts by weight.

[0023] Optionally, the oil and fat comprises at least one of caprylic / capric triglyceride, squalane and triolein; preferably, the oil and fat comprises 1-8 parts by weight of caprylic / capric triglyceride, 2.2-13.8 parts by weight of squalane and 1.5-12.5 parts by weight of triolein.

[0024] The humectant comprises at least one of glycerol, butylene glycol, betaine and sodium hyaluronate; preferably, the humectant comprises 2-5 parts by weight of glycerol, 2-5 parts by weight of butylene glycol, 0.5-2 parts by weight of betaine and 0.01-0.1 parts by weight of sodium hyaluronate.

[0025] Optionally, in step (3), the preservative is added to the cooled B phase; the preservative is phenoxyethanol, and the weight fraction of phenoxyethanol is 0.15-0.68 parts.

[0026] The present application also provides an essence prepared by the preparation method.

[0027] The present application also provides the use of the essence in the preparation of cosmetics and skin care products.

[0028] In summary, the present application has at least one of the following beneficial effects:

[0029] The present application obtains phase A by mixing and stirring water, a humectant and a thickening agent hydrogel having a network structure, obtains the final product by homogenizing phase A with oil and fat under high-speed conditions of 4500-8000 r / min for 5-18 min, and then adding a pH regulator and stirring, realizes the purpose of long-term uniformity and stability of the appearance of the essence containing a large amount of oil and fat by uniformly dispersing oil particles in the network structure of the thickening agent hydrogel without adding a large amount of emulsifier, and meets the safety and stability requirements of the essence. The essence prepared by the method of the present application achieves the purpose of promoting the dispersion of oil by the above-mentioned physical method, is not easy to produce burden on sensitive skin, and improves the applicability of the essence. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows.

[0031] Figure 1Appearance of Example 3 stored at different temperatures for 30 days, wherein (a) is the appearance of storage at room temperature for 30 days; (b) is the appearance of storage at -20℃ for 30 days; (c) is the appearance of storage at 4℃ for 30 days; (d) is the appearance of storage at 40℃ for 30 days; (e) is the appearance of storage at 45℃ for 30 days; (f) is the appearance of storage at 50℃ for 30 days. DETAILED DESCRIPTION

[0032] The application will be further described in conjunction with the examples. It should be understood that the examples are only used for further illustrating and explaining the application, and are not intended to limit the application.

[0033] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present application, illustrative materials and methods are described below. However, if there is a conflict between the definitions in the specification including that of the appended claims and that of a document incorporated herein by reference, the definition in the specification shall control. In addition, the materials, methods, and examples are illustrative only and not intended to be limiting.

[0034] The experimental methods, detection methods and conventional experimental reagent preparation methods used in the embodiments of the application are all in accordance with the conventional operations in the art, unless otherwise specified.

[0035] In order to facilitate the description of the technical scheme of the present application, the following materials and steps are described before the experiment of the present application is started:

[0036] (1) The thickening agent used in the present application can use any thickening agent that can form a three-dimensional network structure hydrogel in water. For example, it has been proved by experiments of the present application that the thickening agent can use at least one of acryloyl dimethyl ammonium taurate / vinyl pyrrolidone copolymer (CAS#58374-69-9), polyacrylate cross-linked polymer-6, gelatin, acrylate cross-linked polymer or polyacryloyl dimethyl sodium taurate, wherein the acrylate cross-linked polymer is preferably acrylate / C10-30 alkyl acrylate cross-linked polymer (purchased from Wuhan Andomac New Energy Co., Ltd. Cosmetic Grade).

[0037] (2) The pH regulator in the present application can use tromethamine or arginine, and the purpose of using the pH regulator is to adjust the pH of the final product to 6.0-6.7, so that the final product has a suitable viscosity. As an example, tromethamine is used in the subsequent experiments of the present application.

[0038] (3) The type of moisturizing agent and oil is not specifically limited in the present application, because the technical solution of the present application is applicable to various types of moisturizing agents and oils that can be applied to human skin. Therefore, as an example, the oil can be octanoic acid / decanoic acid triglyceride, squalane and triolein; the moisturizing agent can be glycerol, butylene glycol, betaine and sodium hyaluronate.

[0039] Examples 1-6

[0040] In the preparation process of the serum in Examples 1-6, the raw materials are weighed as follows: thickening agent 0.1-0.8 parts; moisturizing agent 1-15 parts; oil 4-30 parts; preservative 0.15-0.68 parts; tromethamine 0.05-0.7 parts, and purified water 60-85 parts. The preparation method of the serum in each example is as follows:

[0041] Example 1:

[0042] (1) 3 g of glycerol, 3 g of butylene glycol, 1 g of betaine, 0.1 g of sodium hyaluronate and 0.5 g of thickening agent are directly mixed and then added to 73 g of water, heated to 80°C, and stirred at a stirring speed of 200 r / min for 3 min to obtain phase A; wherein the thickening agent is selected from gelatin.

[0043] (2) 3 g of octanoic acid / decanoic acid triglyceride, 5 g of squalane and 5 g of triolein are added to phase A, and homogenized at 6000 r / min for 12 min to obtain phase B.

[0044] (3) 0.2 g of tromethamine and 0.4 g of phenoxyethanol are added to phase B cooled to 40°C, and stirred at a stirring speed of 200 r / min for 2 min to obtain the final product.

[0045] Examples 2-4:

[0046] The difference from Example 1 is that:

[0047] In step (1), an equal amount of thickening agent is spread on the water surface, and after the thickening agent is completely immersed, an equal amount of glycerol, an equal amount of butylene glycol, an equal amount of betaine and an equal amount of sodium hyaluronate are added while stirring at a stirring speed of 200 r / min, heated to 80°C, and continuously stirred at a stirring speed of 200 r / min for 3 min to obtain phase A; wherein the composition and amount of thickening agent in each example are shown in Table 1.

[0048] Examples 5-6:

[0049] The difference from Example 3 is that in step (3), the amount of tromethamine added is shown in Table 1.

[0050] Table 1. Composition of thickening agent and amount of tromethamine added during preparation of serum in Examples 2-6.

[0051]

[0052] Comparative Example 1

[0053] The difference between Example 3 and Example 4 is that in the preparation of the serum, only 0.5 g of the acrylates / C10-30 alkyl acrylate crosspolymer is added in step (1).

[0054] Comparative Example 2

[0055] The difference between Example 3 and Example 5 is that in the preparation of the serum, only 0.5 g of the polyacryloyldimethyl taurate is added in step (1).

[0056] Comparative Examples 3-9

[0057] The difference between the serum of Comparative Examples 3-9 and Example 3 is that in the preparation of the serum, the mixing process in steps (1)-(3) is different, as shown in Table 2.

[0058] Table 2. Mixing process in steps (1)-(3) during the preparation of the serum in Comparative Examples 3-9

[0059]

[0060]

[0061] Performance Test Test

[0062] The final products of the serums obtained in Examples 1-6 and Comparative Examples 1-9 were respectively subjected to appearance observation and stability test. Among them, the test method of stability is as follows:

[0063] The final products of the serums obtained in Examples 1-6 and Comparative Examples 1-9 were respectively stored at room temperature, -20℃ and 50℃, and at the same time, the stratification phenomenon of each product was observed with naked eye after 7 days and 30 days; then each product was centrifuged at 2000 r / min, 3000 r / min and 5000 r / min for 30 min, and the stratification was observed, and the results are shown in Table 3. It should be noted that when the final product shows obvious stratification phenomenon under various temperature conditions, it means that the stability of the final product is poor, and it is not necessary to test under the centrifugal condition.

[0064] Table 3. Performance test results of the serums prepared in Examples 1-6 and Comparative Examples 1-9.

[0065]

[0066]

[0067] Firstly, according to the data in Table 3, the following conclusions can be drawn:

[0068] ①The serum prepared by using the thickening agent in Examples 1-6 has no stratification phenomenon during long-term storage under different temperature conditions, and has good stability, which indicates that the preparation method provided by the present application can prepare serum with uniform appearance and high stability. It should be noted that although the viscosity of some of the serum prepared in Examples 1-6 increases, the entire serum is still in a uniform and stable state at various temperatures, which does not affect normal use. The appearance of the serum prepared in Example 3 after storage at room temperature, -20℃, 4℃, 40℃ and 45℃ for 30 days is shown in FIG. 1. Figure 1 Figure 1 In FIG. 1, (a) is the appearance after storage at room temperature for 30 days; (b) is the appearance after storage at -20℃ for 30 days; (c) is the appearance after storage at 4℃ for 30 days; (d) is the appearance after storage at 40℃ for 30 days; (e) is the appearance after storage at 45℃ for 30 days; and (f) is the appearance after storage at 50℃ for 30 days.

[0069] ②The mass ratio of the acrylic acid ester / C10-30 alkyl acrylate cross-linked polymer to the polyacryloyldimethyl sodium taurate has a great influence on the appearance of the serum. As can be seen from the data in Examples 2-4, when the thickening agent is a mixture of the acrylic acid ester / C10-30 alkyl acrylate cross-linked polymer and the polyacryloyldimethyl sodium taurate, the serum prepared has a white semi-transparent thin emulsion appearance, and has extremely high stability without stratification phenomenon under any temperature and rotation speed conditions, when the mass ratio of the acrylic acid ester / C10-30 alkyl acrylate cross-linked polymer to the polyacryloyldimethyl sodium taurate is within a suitable range. When the polyacryloyldimethyl sodium taurate is less (Example 4), the prepared serum has a higher viscosity, which may be due to the high viscosity of the acrylic acid ester / C10-30 alkyl acrylate cross-linked polymer aqueous solution. When the polyacryloyldimethyl sodium taurate is more (Example 2), the prepared serum has a white transparent thin emulsion appearance, which shows that the mass ratio of the acrylic acid ester / C10-30 alkyl acrylate cross-linked polymer to the polyacryloyldimethyl sodium taurate has a certain influence on the appearance of the serum.

[0070] ​In addition, as can be seen from the comparison between Example 3 and Comparative Example 1-2, the suspension stability effect of the oil and fat is not as good as that of the combination of the two, specifically, in Comparative Example 1, since only the acrylate / C10-30 alkyl acrylate crosspolymer is added, the prepared serum is layered after being placed at room temperature for 30 days; in Comparative Example 2, since only the sodium polyacryloyldimethyl taurate is added, the prepared serum is layered after being placed at -20°C for 30 days. Thus, it can also be concluded that the presence or absence of the sodium polyacryloyldimethyl taurate has a greater impact on the stability of the final product, which may be due to the fact that the network structure of the sodium polyacryloyldimethyl taurate is relatively large, which helps to fully contact the oil and fat particles and achieve effective suspension, so the sodium polyacryloyldimethyl taurate has a greater impact on the stability of the serum, and when the sodium polyacryloyldimethyl taurate is added, the stability of the prepared serum is relatively slightly higher.

[0071] ③The addition amount of the pH adjuster also has an impact on the appearance of the serum. According to the data of Example 3 and Examples 5-6, the pH adjuster can affect the viscosity of the serum, and the inventors have found that when the addition ratio of the pH adjuster to the thickening agent is within a suitable range, the prepared serum is a white semi-transparent thin emulsion. When the pH adjuster is added in a small amount, the whole serum is relatively thin, and the appearance of the serum is a white transparent thin emulsion; when the pH adjuster is added in a large amount, the whole serum is slightly thick. Accordingly, the amount of the pH adjuster can be selected as needed to meet the needs of different users.

[0072] Secondly, the following conclusions can also be drawn from the data in Table 3:

[0073] ①The homogenization speed in step (2) should be within a suitable range. According to Example 3 and Comparative Examples 3-5, when the oil and fat is added to the A phase, a suitable homogenization speed is crucial. If the homogenization speed is small, it may be not conducive to the dispersion of the oil and fat, and also not conducive to the effective adsorption between the oil and fat particles and the thickening agent, so that the finally prepared serum is unstable and layered after being placed for a short time, and has poor stability; if the homogenization speed is large, even if the homogenization time is shortened, the structure of the thickening agent may be destroyed, or the structure adsorbed with the oil and fat particles is broken into many fragments, thereby failing to effectively suspend the oil and fat particles, resulting in that the prepared serum is layered after being placed for a short time, and has poor stability;

[0074] In step (2), the homogenization process is superior to the stirring process. As can be seen from Comparative Example 3 and Comparative Example 6, in Comparative Example 6, although the stirring speed reaches 6000 r / min, the effect achieved in Example 3 still cannot be achieved, which is probably because the stirring and homogenization have different effects. The stirring only mixes the materials simply, while the homogenization makes the raw materials in the dispersion system subjected to a suitable degree of shear force and pressure effect through the effect of turbulence or cavitation. Therefore, when the stirring method is used in Comparative Example 3, the oil cannot be dispersed completely, so the effect of making the serum uniform and stable cannot be achieved. It is worth mentioning that, based on the effect of homogenization, it can also be further proved that the homogenization speed in step (2) is crucial. If the homogenization speed is too high, the shear force and pressure effect generated will also be greater, thereby destroying the structure of the thickening agent, and the effect of making the serum uniform and stable cannot be achieved.

[0075] It should also be noted that the application also found through experiments that the dispersion degree of the oil is not related to the temperature of the A phase, so the temperature in step (2) can be between 40°C and 80°C. Therefore, when step (2) is performed, it is not necessary to lower the temperature in time, or to heat or keep warm, which greatly facilitates the operation.

[0076] In the process of preparing the serum, the mixing method of the materials in each step needs to be different. As can be seen from Example 3 and Comparative Examples 7-9, and proved by experiments, when the stirring method is used in step (1), the homogenization method is used in step (2), and the stirring method is used in step (3), the serum prepared has good uniformity and stability. In Comparative Example 9, the emulsification method is used in steps (1)-(3), and the serum prepared has very poor stability, which is probably because the emulsification process has a greater destructive effect on the thickening agent, thereby causing a small amount of oil to remain in the serum. It should be noted that when the emulsification method is used in steps (1)-(3), the serum prepared still has poor stability. In addition, the application mixes the pH regulator, preservative and oil into the A phase, and homogenizes at 6000 r / min for 12 min to obtain a serum, and the test results of the serum are the same as those of Comparative Example 8. The above results are probably related to the structure of the thickening agent acrylic acid (ester) / C10-30 alkyl alcohol acrylate cross-linked polymer. As can be seen from the above, the stability of the serum is related to the mixing method in each step.

[0077] Summary: A phase A is obtained by mixing and stirring water, humectant and thickening agent hydrogel with network structure, and then homogenizing the phase A with oil at a high speed of 4500-8000 r / min for 5-18 min, and then adding a pH regulator to obtain the final product by stirring, so that the oil particles are uniformly dispersed in the hydrogel network formed by the thickening agent, and the appearance of the essence containing a large amount of oil is uniform and stable for a long time, and the safety and stability requirements of the essence are met.

[0078] It is proved by experiments that when the thickening agent is a mixture of acrylate / C10-30 alkyl acrylate crosspolymer and polyacryloyldimethyl taurate, and the mass ratio of acrylate / C10-30 alkyl acrylate crosspolymer and polyacryloyldimethyl taurate is 1:1.3-3.2, the appearance of the prepared essence is white viscous emulsion, and it is relatively stable under any temperature condition and centrifugal condition. In addition, the pH regulator also has a great influence on the appearance of the prepared essence.

[0079] It should be understood that the disclosed application is not limited to the specific methods, schemes and materials described, as these can vary. It should also be understood that the terminology used here is only for the purpose of describing specific implementation schemes, and is not intended to limit the scope of the application, which is only limited by the appended claims.

[0080] Those skilled in the art will also recognize or be able to ascertain many equivalents to the specific embodiments of the application described herein. Such equivalents are intended to be included in the following claims.

Claims

1. A method for preparing an essence, characterized in that, The method includes: (1) Mix water, thickener and humectant, and stir at a temperature of 60-100℃ to obtain phase A; the hydrogel formed by the thickener has a network structure; (2) Add the oil to phase A and homogenize it for 5-18 min at 4500-8000 r / min to obtain phase B; (3) Add the pH adjuster to phase B and stir to obtain the final product; By weight, the thickener comprises 0.1-0.8 parts; the humectant 1-15 parts; the oil 4-30 parts; the pH adjuster 0.05-0.7 parts; and the water 60-85 parts. The thickener comprises an acrylate / C10-30 alkanol acrylate crosspolymer and sodium polyacrylamide dimethyl taurate, wherein the mass ratio of the acrylate / C10-30 alkanol acrylate crosspolymer to the sodium polyacrylamide dimethyl taurate is 1:1.3-3.2; and the mass ratio of the pH adjuster to the thickener is 1:0.4-0.

8.

2. The method for preparing the essence according to claim 1, characterized in that, In step (2), homogenize for 7-13 minutes at 5800-7200 r / min.

3. The method for preparing the essence according to claim 1, characterized in that, The mass ratio of the acrylate / C10-30 alkanol acrylate crosspolymer to the sodium polyacrylamide dimethyl taurate is 1:1.5-1.

9.

4. The method for preparing the essence according to claim 1, characterized in that, In step (1), the steps of mixing water, thickener and humectant also include: spreading the thickener evenly on the water surface, letting it stand, and adding the humectant while stirring after the thickener is completely submerged.

5. The method for preparing the essence according to claim 1, characterized in that, The pH adjuster is either tromethamine or arginine.

6. The method for preparing the essence according to claim 1, characterized in that, By weight, the acrylate / C10-30 alkanol acrylate crosspolymer comprises 0.05-0.4 parts; the sodium polyacrylamide dimethyl taurate comprises 0.065-0.75 parts.

7. The method for preparing the serum according to any one of claims 1-6, characterized in that, The oil includes at least one of caprylic / capric triglyceride, squalane, and triolein; The moisturizer includes at least one of glycerin, butylene glycol, betaine, and sodium hyaluronate.

8. The method for preparing the essence according to claim 7, characterized in that, By weight, the oil comprises 1-8 parts caprylic / capric triglyceride, 2.2-13.8 parts squalane and 1.5-12.5 parts triglyceride; the moisturizer comprises 2-5 parts glycerin, 2-5 parts butylene glycol, 0.5-2 parts betaine and 0.01-0.1 parts sodium hyaluronate.

9. The method for preparing the essence according to claim 7, characterized in that, In step (3), the preservative is added to the cooled B phase; the preservative is phenoxyethanol, and the weight of phenoxyethanol is 0.15-0.68 parts.

10. An essence, characterized in that, It is prepared by any one of the preparation methods described in claims 1-9.

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