Moisturizing face cream containing lamellar liquid crystal structure and preparation method of moisturizing face cream

Abstract

The invention discloses a moisturizing face cream containing a lamellar liquid crystal structure and a preparation method thereof, the moisturizing face cream comprises the following raw materials by mass: 0.02-0.20% of a polysaccharide moisturizer, 5-20% of a polyol moisturizer I, 0.01-4% of a polyol moisturizer II, 1-5% of a liquid crystal emulsifier, 1-4% of a co-emulsifier, 10-35% of an emollient, 0.2-0.6% of a water phase antioxidant, 0.1-1.0% of an oil phase antioxidant, 0.1-1.2% of a thickener, 0.02-0.1% of a chelating agent, and the balance of water. And the balance of purified water. A one-step phase transition temperature emulsification method is adopted, a specific liquid crystal emulsifier is reasonably compounded with other components, PIT parameters are regulated and controlled, the moisturizing face cream which is high in stability, long in service life and good in skin feeling and contains the lamellar liquid crystal structure can be prepared, the production cost is low, and actual production operation is convenient.

Description

Technical Field

[0001] The present invention belongs to the technical field of cosmetics, and particularly relates to a moisturizing cream containing a lamellar liquid crystal structure and a preparation method thereof. Background Art

[0002] With the continuous progress of technology and the increasing improvement of people's living standards, consumers have higher and higher requirements for skin care and maintenance, have a deeper understanding of the stratum corneum of the human epidermis, and thus put forward higher standards for the stability, comfort, efficacy, etc. of cosmetics.

[0003] The emulsification system in cosmetics is the carrier of the best functional components. It can not only quickly and effectively deliver functional components to skin, hair and other parts, but also make water-soluble, oil-soluble and other raw materials form an organic whole to jointly play the roles of moisturizing and beauty care. As a new type of emulsification system, the liquid crystal emulsification system generally refers to an emulsification system in which surfactant (emulsifier) molecules are arranged in an orderly manner at the oil-water interface to form a liquid crystal structure with long-range order and short-range disorder (generally a lamellar liquid crystal). Different from the traditional oil-in-water (O / W) system, the liquid crystal emulsification system has an oil / liquid crystal / water (O / LC / W) structure, and the existence of lamellar liquid crystals can be clearly seen under a polarized light microscope. It should be noted that the lamellar liquid crystal structure at the oil-water interface is similar to the stratum corneum structure of the human body and has functions similar to those of a healthy stratum corneum. After attaching to the skin, it is equivalent to the "second skin" of the human body. Therefore, compared with ordinary creams, creams with a liquid crystal structure layer have many significant advantages, such as being able to encapsulate water-soluble and oil-soluble efficacy components, improving the stability of the system, having good moisturizing effects, promoting absorption, having good biocompatibility, improving permeability, controlling the slow release of active ingredients, and providing a refreshing skin feel.

[0004] At present, there have been some relevant reports and patents on liquid crystal cosmetics and their preparation methods. For example, Chinese invention patent CN109528606B discloses a lamellar liquid crystal cosmetic containing a compound plant composition containing trichosanthes root and a preparation method thereof. The lamellar liquid crystal structure cosmetic of this composition greatly increases the stability and moisturizing property of the product, and at the same time can extend the release and action time of efficacy components such as the compound plant extract composition and bring excellent skin feel. However, in this method, the oil phase is added to the water phase at one time for emulsification, so the prepared product is actually still a traditional oil-in-water (O / W) system, with defects such as less liquid crystal structure and unsatisfactory lamellar liquid crystal structure, and it is difficult to fully exert the advantages of the lamellar liquid crystal structure in the cream.

[0005] In addition, in the prior art, traditional ordinary emulsification methods and multi-step and relatively complex process methods are mostly used to prepare liquid crystal cosmetics. However, it is not easy to form a lamellar liquid crystal structure by the traditional ordinary emulsification method, or even if it is formed, the liquid crystal structure is less, and the skin feel is relatively heavy. And the multi-step and relatively complex process method is not conducive to large-scale production operations, and the production conversion is difficult. Summary of the Invention

[0006] To solve the deficiencies in the prior art, the present invention provides a moisturizing cream containing a lamellar liquid crystal structure and a preparation method thereof. By using a one-step phase transition temperature emulsification method, through reasonable compounding of a liquid crystal emulsifier and other components, and regulating the PIT parameter, a moisturizing cream containing a lamellar liquid crystal structure with high stability, long service life, good skin feel can be prepared, and the production cost is low, and the actual production operation is convenient.

[0007] The main technical solution adopted in the present invention is as follows:

[0008] A moisturizing cream containing a lamellar liquid crystal structure, the raw materials include by mass ratio: 0.02-0.20% of a polysaccharide humectant, 5-20% of a polyol humectant I, 0.01-4% of a polyol humectant II, 1-5% of a liquid crystal emulsifier, 1-4% of a co-emulsifier, 10-35% of an emollient, 0.2-0.6% of an aqueous phase antioxidant, 0.1-1.0% of an oil phase antioxidant, 0.1-1.2% of a thickener, 0.02-0.1% of a chelating agent, and the balance is purified water.

[0009] Preferably, the polysaccharide humectant is one or a mixture of two of sodium hyaluronate and hydrolyzed sodium hyaluronate. Sodium hyaluronate is a high-molecular acidic mucopolysaccharide composed of repeating disaccharide units of N-acetylglucosamine and D-glucuronic acid, which is widely present in the extracellular matrix of connective tissue cells of animals and humans. Its most important physiological function is to have a water retention effect. Hydrolyzed sodium hyaluronate, namely small molecule sodium hyaluronate, can penetrate into the dermis layer, promote blood microcirculation, is beneficial to the absorption of nutrients by the skin, and plays a health care role in beauty and anti-wrinkle.

[0010] Preferably, the polyol humectant I is one or a mixture of glycerol and butanediol.

[0011] Preferably, the polyol humectant II is a 1,2-alkane diol. The polyol has multiple hydroxyl groups, and the hydroxyl groups generate hydrogen bond forces with water molecules in the skin to "lock" the water, so that it has a moisturizing effect.

[0012] Preferably, the liquid crystal emulsifier is one or a mixture of alkyl glycoside liquid crystal emulsifiers and lecithin liquid crystal emulsifiers.

[0013] Preferably, the co-emulsifier is a higher fatty alcohol co-emulsifier.

[0014] Preferably, the emollient is a medium-high polarity emollient, and its polarity index satisfies ≤ 25.5 mN / m.

[0015] Preferably, the thickener is an acrylic polymer and its derivatives.

[0016] Preferably, the chelating agent is a metal ion chelating agent.

[0017] A method for preparing a moisturizing cream containing a lamellar liquid crystal structure, which is used to prepare a moisturizing cream, and the specific steps are as follows:

[0018] S1: Mix purified water, polysaccharide moisturizer, polyol moisturizer I, chelating agent, aqueous antioxidant, and thickener in proportion, stir evenly, and heat to 75°C to 85°C, then continue to keep warm and stir for 10 to 20 minutes for use as the aqueous phase.

[0019] S2: Mix the liquid crystal emulsifier, co-emulsifier, emollient, and oil-phase antioxidant in proportion, heat to 75 - 85°C until melted and evenly mixed, and use it as the oil phase.

[0020] S3: Slowly add the aqueous phase prepared in step S1 to the oil phase prepared in step S2, keep the temperature at 75 - 85°C, slowly stir and mix evenly, and then homogenize for 5 - 8 minutes.

[0021] S4: Continue to stir and cool the homogenized mixture to 55 - 70°C until a phase transition occurs.

[0022] S5: Continue to cool the mixture with a phase transition to 40 - 45°C, add the remaining raw materials and mix evenly, and continue to stir and cool.

[0023] S6: When the mixture cools below 37°C, stop stirring to obtain a moisturizing cream containing a lamellar liquid crystal structure.

[0024] Beneficial effects: The present invention provides a moisturizing cream containing a lamellar liquid crystal structure and a preparation method thereof, which has the following advantages:

[0025] (1) The present invention adopts a one-step phase transition temperature emulsification method to replace the traditional emulsification process for preparing a moisturizing cream. By realizing the reasonable compounding of the liquid crystal emulsifier and other components and effectively controlling the phase transition temperature value, the content of the liquid crystal structure in the moisturizing cream can be greatly increased, a stable lamellar liquid crystal structure can be formed in the emulsification system, thereby improving the high appearance stability and skin feel experience of the moisturizing cream, and extending the service life of the cream.

[0026] (2) In the present invention, a one-step phase transition temperature emulsification method is used to prepare a moisturizing cream containing a lamellar liquid crystal structure, which greatly simplifies the preparation process of lamellar liquid crystal products in the moisturizing cream. The actual production operation is convenient, and the production cost is greatly reduced, which is conducive to realizing batch production. Description of the Drawings

[0027] Figure 1 Polarizing microscope photograph (100 times) of the liquid crystal structure of the product of Example 1;

[0028] Figure 2 Polarizing microscope photograph (400 times) of the liquid crystal structure of the product of Example 1;

[0029] Figure 3 Polarizing microscope photograph (100 times) of the liquid crystal structure of the product of Example 2;

[0030] Figure 4 Polarizing microscope photograph (400 times) of the liquid crystal structure of the product of Example 2;

[0031] Figure 5 Polarizing microscope photograph (100 times) of the liquid crystal structure of the product of Example 3;

[0032] Figure 6 Polarizing microscope photograph (400 times) of the liquid crystal structure of the product of Example 3;

[0033] Figure 7 Polarizing microscope photograph (100 times) of the liquid crystal structure of the product of Example 4;

[0034] Figure 8 Polarizing microscope photograph (400 times) of the liquid crystal structure of the product of Example 4;

[0035] Figure 9 Polarizing microscope photograph (100 times) of the liquid crystal structure of the product of Example 5;

[0036] Figure 10 Polarizing microscope photograph (400 times) of the liquid crystal structure of the product of Example 5.

[0037] Figure 11 Polarizing microscope photograph (100 times) of the liquid crystal structure of the product of Comparative Example 1;

[0038] Figure 12 Polarizing microscope photograph (400 times) of the liquid crystal structure of the product of Comparative Example 1;

[0039] Figure 13 Polarizing microscope photograph (100 times) of the liquid crystal structure of the product of Comparative Example 2;

[0040] Figure 14 Polarizing microscope photograph (400x) of the liquid crystal structure of the product of Comparative Example 2;

[0041] Figure 15 Polarizing microscope photograph (100x) of the liquid crystal structure of the product of Comparative Example 3;

[0042] Figure 16 Polarizing microscope photograph (400x) of the liquid crystal structure of the product of Comparative Example 3;

[0043] Figure 17 Polarizing microscope photograph (100x) of the liquid crystal structure of the product of Comparative Example 4;

[0044] Figure 18 Polarizing microscope photograph (400x) of the liquid crystal structure of the product of Comparative Example 4;

[0045] Figure 19 Polarizing microscope photograph (100x) of the liquid crystal structure of the product of Comparative Example 5;

[0046] Figure 20 Polarizing microscope photograph (400x) of the liquid crystal structure of the product of Comparative Example 5. Detailed implementation manners

[0047] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0048] Example 1

[0049] In this Example 1, a moisturizing cream containing a lamellar liquid crystal structure was prepared by a one-step phase transition temperature emulsification method. The specific method is as follows:

[0050] S1: Mix purified water, polysaccharide humectant, polyol humectant I, chelating agent, aqueous antioxidant, and thickener, stir until uniform, and heat to 75°C - 85°C, then continue to stir and keep warm for 10 - 20 min for use as the aqueous phase for heat preservation;

[0051] S2: Mix liquid crystal emulsifier, co-emulsifier, emollient, and oil-phase antioxidant in proportion, heat to 75 - 85°C until melted and uniform, as the oil phase.

[0052] S3: Slowly add the aqueous phase prepared in step S1 to the oil phase prepared in step S2, maintain the temperature at 75 - 85°C, slowly stir and mix evenly, then homogenize for 5 - 8 min at a homogenization speed of 3000 - 4000 rpm;

[0053] S4: Continue to stir and cool the homogenized mixture at a speed of 200 - 400 rpm until a phase transition occurs, and record the phase transition temperature simultaneously;

[0054] S5: Continue to cool the mixture with a phase transition to 40 - 45°C, add the remaining raw materials and mix evenly, then stir at a speed of 200 - 400 rpm for 3 - 8 min and continue to cool;

[0055] S6: When the mixture cools below 37°C, stop stirring to obtain a moisturizing cream containing a liquid crystal structure.

[0056] Example 2

[0057] In this Example 2, a moisturizing cream containing a lamellar liquid crystal structure is prepared by the one-step phase transition temperature emulsification method. The specific implementation steps are different from those of Example 1 in that the homogenization speed in step S3 is 6000 - 8000 rpm, and the other steps and preparation parameters are the same as those of Example 1.

[0058] The preparation methods of Examples 3 - 5 and Comparative Examples 2 - 5 are all the one-step phase transition temperature emulsification method, and the specific implementation steps are the same as those of Example 2.

[0059] Comparative Example 1

[0060] In Comparative Example 1, a moisturizing cream is prepared by the ordinary emulsification method, and its specific implementation steps are as follows:

[0061] S1: Mix purified water, polysaccharide moisturizer, polyol moisturizer I, chelating agent, aqueous phase antioxidant, and thickening agent, stir until uniform, and heat to 75°C - 85°C, then continue to keep warm and stir for 10 - 20 min for use as the aqueous phase.

[0062] S2: Heat the liquid crystal emulsifier, co-emulsifier, emollient, and oil phase antioxidant to 75 - 85°C until melted and uniform for use as the oil phase.

[0063] S3: Add the oil phase prepared in step S2 to the aqueous phase prepared in step S1, maintain the temperature at 75 - 85°C, slowly stir and mix evenly, and then homogenize at a homogenization speed of 3000 - 4000 rpm for 5 - 8 min;

[0064] S4: After homogenization, stir and cool to 40 - 45°C at a speed of 200 - 400 rpm;

[0065] S5: When the temperature is lowered to 40 - 45 °C, add the remaining raw materials and stir at 200 - 400 rpm for 3 - 8 min to mix evenly; after mixing evenly, stir to lower the temperature.

[0066] S6: When the temperature is lowered to below 37 °C, stop stirring, and the moisturizing cream can be obtained.

[0067] The specific components and ratios of the raw materials in Examples 1 - 5 are shown in Table 1. Among them, the oil - phase antioxidant is an oil - soluble substance used to prevent the product from oxidizing and deteriorating during storage and use, and the water - phase antioxidant is a water - soluble substance used to prevent the product from oxidizing and deteriorating during storage and use. In Examples 1 - 5 and Comparative Examples 1 - 5, the oil - phase antioxidant is preferably tocopheryl acetate, and the water - phase antioxidant is preferably p - hydroxyacetophenone.

[0068] In Examples 1 - 5, the higher - fatty - alcohol co - emulsifier is preferably cetearyl alcohol. The presence of cetearyl alcohol can not only make the critical packing parameter of the co - micelle closer to 1, which is beneficial to the formation of liquid crystals, but also improve the emulsion stability by combining with the liquid - crystal emulsifier to form a gel network.

[0069] In Examples 1 - 5, the polyol humectant Ⅰ is a mixture of glycerol and butanediol. The polyol humectant Ⅱ is preferably 1,2 - hexanediol.

[0070] In Examples 1 - 5, the emollient used is a medium - to - high - polarity emollient, and its polarity index satisfies ≤ 25.5 mN / m. Increasing the content of medium - to - high - polarity oils is more conducive to the formation of liquid - crystal structures. For example, jojoba seed oil, coix seed oil, and caprylic / capric triglyceride are all medium - to - high - polarity oils. One or a mixture of existing emollients such as shea butter, jojoba seed oil, coix seed oil, caprylic / capric triglyceride, isocetane, silicone oil, sunflower seed wax, acacia flower wax, polyglycerol - 3, and tocopherol that meet medium - to - high polarity (polarity index satisfies ≤ 25.5 mN / m) can be applicable to the present invention. The ACTICIRE MB used in Example 1 is a commercially available compound raw material and can be used as an emollient.

[0071] In Examples 1 - 5, the thickener used is acryloyldimethyltaurate / VP copolymer. In the present invention, the acrylic - polymer and its derivative thickeners can include but are not limited to acryloyldimethyltaurate / VP copolymer.

[0072] In Examples 1 - 5, the metal - ion chelating agent used is disodium EDTA, and any existing metal - ion chelating agent applicable to the system of the present invention can be used.

[0073] The specific components and ratios of the raw materials in Comparative Examples 1-5 are shown in Table 2. The specific components and ratios of the raw materials in Example 1 and Comparative Example 1 are the same. In Examples 2-4 and Comparative Examples 2-5, only the components of the liquid crystal emulsifier are different, and the other raw materials and ratios are the same. Among them, the bionic liquid crystal DZ191 (Shanghai Zhina) is a lecithin-based liquid crystal emulsifier. Lecithin can form a film on the skin surface to protect the skin from irritation and damage. At the same time, it can also have a high affinity with the stratum corneum of the skin to repair the damaged sebum barrier of the skin. Lecithin also has extremely strong hydration ability. These properties make lecithin show good application performance in the cosmetics field. MONTANOV 202 and MONTANOV 68MB (SEPPIC Company) are alkyl glycoside-based liquid crystal emulsifiers; OLIVEM 1000 (HALLSTAR Company) is an olive ester-based liquid crystal emulsifier; NB-286 (Guangdong Gexi Biology) is an anionic emulsifier sodium stearoyl lactylate; LIPOMULSE LUXE MB (VANTAGE Company) is a higher fatty alcohol-based emulsifier.

[0074] Table 1: Raw material composition and percentage content (%) of Examples 1-5

[0075]

[0076]

[0077] Table 2: Raw material composition and percentage content (%) of Comparative Examples 1-5

[0078]

[0079] Based on the raw material composition and ratio recorded in Table 1 and Table 2, during the preparation of the moisturizing cream by the one-step phase transition temperature emulsification method in Examples 1-5 and Comparative Examples 2-5, the phase transition temperature (PIT) of each emulsification system is shown in Table 3.

[0080] Table 3: Phase transition temperature (PIT) values of each emulsification system

[0081]

[0082] As can be seen from the phase transition temperature (PIT) values shown in Table 3, in Examples 1-5, the phase transition temperature range of the emulsified system after homogenization in step S4 was 55-70°C. In Comparative Examples 2-5, when the aqueous phase was slowly added to the oil phase in step S3, as the volume of the aqueous phase increased, a phase transition phenomenon occurred during this process (75-85°C). It can be concluded that the type of liquid crystal emulsifier, the type of oil, and the addition amount of co-emulsifier have a greater impact on the PIT value. The present invention can control the particle size of the emulsified system by adjusting the type and addition amount of liquid crystal emulsifier, oil, co-emulsifier, and by adjusting process parameters. It should be noted that since Comparative Example 1 was the ordinary emulsification method, there was no phase transition temperature (PIT) value.

[0083] Test 1: Product performance test

[0084] Test method: Examples 1-5 and Comparative Examples 1-5 were tested according to the test methods listed in the industry standard QB / T1857 "Skin Cream". The test results are shown in Table 4.

[0085] Table 4 Performance test results of product samples

[0086]

[0087] As can be seen from the product performance test results shown in Table 4, the product performance sensory and pH values of Examples 1-5 and Comparative Examples 1-5 all meet the standard requirements, and the viscosity values are all within the acceptable range of facial cream. Among them, the products of Examples 1-4 were slightly off-white transparent, with different degrees of off-white transparency. Among them, the product of Example 1 had the highest transparency. The other examples and comparative examples were all off-ivory.

[0088] Test 2: Product skin feel test

[0089] Test method: Take an appropriate amount of the sample and gently apply it on the skin, and conduct a sensory evaluation of the skin feel based on the skin feel test evaluation criteria shown in Table 5. The specific evaluation results are shown in Table 6.

[0090] Table 5 Skin feel test evaluation criteria for product samples

[0091]

[0092] Table 6 Skin feel test evaluation results for product samples

[0093]

[0094] From the product skin feel evaluation scoring results shown in Table 6, it can be seen that the creams of Examples 1-4 are easy to apply, have a strong sense of moisture, few white streaks, and a fast absorption rate. After application and absorption, they are not sticky and have good air permeability, and the skin feel preference is relatively high, indicating good usability. In addition, the raw material formulations of Comparative Example 1 and Example 1 are the same, but due to the different preparation methods used for the two, there are obvious differences in the skin feel of the two moisturizing creams, especially the sense of moisture, spreadability, and white streak rubbing situation during the initial application. From this, it can be concluded that the present invention can control the product skin feel by adjusting the types and addition amounts of oils, emulsifiers, auxiliary emulsifiers, and by adjusting process parameters, thereby improving the user experience.

[0095] Test Three: Test Results of Product Stability Appearance

[0096] Test method: The test sample products were placed in sample bottles and stored in a constant temperature oven or refrigerator at 23°C, 45°C, 50°C, 4°C, and -18°C for 4 weeks. After 4 weeks, the test sample products were taken out and restored to room temperature, and then directly observed. At the same time, the samples were applied to the skin to observe the stability of the products. The test results are shown in Table 7.

[0097] Table 7 Test Results of Product Sample Stability Appearance (4 weeks)

[0098] Specimen 23℃ 45℃ 50℃ 4℃ -18℃ Example 1 Normal Normal Normal Normal Normal Example 2 Normal Normal Normal Normal Normal Example 3 Normal Normal Normal Normal Normal Example 4 Normal Normal Normal Normal Normal Example 5 Normal Normal Normal Normal Normal Comparative Example 1 Normal Viscosity becomes lower Viscosity becomes lower Normal Slightly coarsens Comparative Example 2 Normal Normal Normal Normal Normal Comparative Example 3 Normal Slightly hardens Slightly hardens Normal Very slightly hardens Comparative Example 4 Normal Normal Normal Normal Slightly hardens Comparative Example 5 Normal Slightly hardens Hardens Normal Normal

[0099] From the stability appearance test results shown in Table 7, it can be seen that the products of Examples 1-5 and Comparative Example 2 maintained normal appearance stability after 4 weeks at different temperatures, while other comparative examples had problems at high temperatures (45°C or 50°C) or at low temperatures (-18°C). This indicates that the product may not meet the performance indicators as the shelf life increases, and the appearance stability is poor when it is in a high-temperature or low-temperature state for a long time.

[0100] Test Four: Polarizing Microscope Photographs of Product Lamellar Liquid Crystal Structure

[0101] Test method: An appropriate amount of the sample was placed on a glass slide and observed using a polarizing microscope, and polarizing microscope photographs (100 times, 400 times) of the liquid crystal structure of the moisturizing cream were obtained. The observation results are shown in Table 8.

[0102] Table 8 Observation Results of Product Sample Liquid Crystal Structure

[0103]

[0104]

[0105] The following results can be obtained from the observation results shown in Table 8:

[0106] (1) The formulation of Comparative Example 1 is the same as that of Example 1. However, due to the differences in their preparation methods, the moisturizing creams obtained from the two show significant differences in terms of liquid crystal structure. Specifically, the common emulsification method was used in the comparative example to prepare the moisturizing cream, and the moisturizing cream obtained by this method contains only a very small amount of liquid crystal structure. In contrast, Example 1 used the one-step phase transition temperature emulsification method to prepare the moisturizing cream, and the obtained moisturizing cream contains obvious liquid crystal structures, and these liquid crystal structures are relatively large. In addition, based on the test results of comprehensive product performance, skin feel, and stability appearance, the product with obvious and relatively large liquid crystal structures has a characteristic of being slightly white and transparent in appearance, has a relatively high skin feel evaluation during use, and also shows significant advantages in terms of appearance stability.

[0107] (2) Although Examples 1-5 and Comparative Examples 2-5 all used the one-step phase transition temperature emulsification method to prepare the moisturizing cream, different adjustments were made to the raw material components and contents such as the type of emulsifier, the type of oil, and the co-emulsifier, as well as the preparation parameters in the formulation, resulting in differences in the liquid crystal structures of the obtained moisturizing creams. Among them, the moisturizing creams obtained in Examples 1-5 contain obvious lamellar liquid crystals with a Maltese structure, and the content of the liquid crystal structure is large and the structure is complete. In Comparative Examples 2-5, the obtained moisturizing creams either have a low liquid crystal content or no liquid crystal structure can be observed. Based on the test results of comprehensive product performance, skin feel, and stability appearance, the product with a large content of lamellar liquid crystals has a slightly white and transparent appearance, has a better user experience, and also shows significant advantages in terms of appearance stability. It can be seen from this that the present invention can adjust the distribution, quantity, and size of the liquid crystal structures in the product by adjusting the raw material components and contents such as the type of emulsifier, the type of oil, and the addition amount of the co-emulsifier, as well as the preparation parameters in the formulation.

[0108] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should all fall within the scope of protection of the present invention.

Claims

1. A moisturizing facial cream containing a lamellar liquid crystal structure, characterized in that: The raw materials include, by mass ratio: polysaccharide moisturizer 0.02-0.20%, polyol moisturizer I 5-20%, polyol moisturizer II 0.01-4%, liquid crystal emulsifier 1-5%, co-emulsifier 1-4%, emollient 10-35%, water phase antioxidant 0.2-0.6%, oil phase antioxidant 0.1-1.0%, thickener 0.1-1.2%, chelating agent 0.02-0.1%, and the balance is purified water.

2. The moisturizing facial cream containing a lamellar liquid crystal structure according to claim 1, characterized in that: The polysaccharide moisturizer is one of sodium hyaluronate and hydrolyzed sodium hyaluronate, or a mixture of the two.

3. The moisturizing facial cream containing a lamellar liquid crystal structure according to claim 1, characterized in that: The polyol moisturizer I is a mixture of one or more of glycerol and butylene glycol.

4. The moisturizing facial cream containing a lamellar liquid crystal structure according to claim 1, characterized in that: The polyol moisturizing agent II is a 1,2-alkane diol.

5. The moisturizing facial cream containing a lamellar liquid crystal structure according to claim 1, characterized in that: The liquid crystal emulsifier is a mixture of one or more of an alkyl glycoside liquid crystal emulsifier and a lecithin liquid crystal emulsifier.

6. The moisturizing facial cream containing a lamellar liquid crystal structure according to claim 1, characterized in that: The auxiliary emulsifier is a higher fatty alcohol auxiliary emulsifier.

7. The moisturizing facial cream containing a lamellar liquid crystal structure according to claim 1, characterized in that: The emollient is a medium-to-high polarity emollient, and its polarity index satisfies ≤25.5 mN / m.

8. The moisturizing facial cream containing a lamellar liquid crystal structure according to claim 1, characterized in that: The thickener is acrylic acid polymer and its derivatives.

9. The moisturizing facial cream containing a lamellar liquid crystal structure according to claim 1, characterized in that: The chelating agent is a metal ion chelating agent.

10. A method for preparing a moisturizing facial cream containing a lamellar liquid crystal structure, characterized in that: For preparing the moisturizing facial cream according to any one of claims 1 to 9, the specific steps are as follows: S1: Mix purified water, polysaccharide moisturizer, polyol moisturizer I, chelating agent, water phase antioxidant, and thickener in proportion and stir evenly, heat to 75°C to 85°C, and continue to keep warm and stir for 10 to 20 minutes, as the water phase for standby use; S2: Mix the liquid crystal emulsifier, the co-emulsifier, the emollient, and the oil phase antioxidant in proportion and heat to 75-85° C. until they are uniformly melted to form the oil phase; S3: slowly add the water phase obtained in step S1 to the oil phase obtained in step S2, maintain the temperature at 75-85°C, slowly stir and mix evenly, and homogenize for 5-8 minutes; S4: Continue stirring the homogenized emulsified system and cool it down to 55-70° C. until a phase transition occurs; S5: Continue cooling the emulsified system with phase transition to 40-45° C., add the remaining raw materials and mix evenly, and continue stirring and cooling; S6: When the temperature of the emulsified system drops below 37°C, the stirring is stopped to obtain a moisturizing facial cream containing a lamellar liquid crystal structure.

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