Skin care product with excellent rheological property and skin feeling and preparation method thereof

Abstract

The invention discloses a skin care product with excellent rheological property and skin feeling and a preparation method thereof, and the skin care product comprises the following components in percentage by weight: 6.5-25% of grease, 7.45-30% of a humectant, 1.2-15% of a softening and moistening agent, 1.2-15% of an emulsifier, 0.2-8% of a thickening agent and the balance of water. The weight percentage of the functional components is 0.1-25%, and the balance is water. According to the skin care product with excellent rheological property and skin feeling and the preparation method of the skin care product, the problems of single rheological property, poor skin feeling and the like generally existing in skin care products in the current market can be solved. According to the skin care product disclosed by the invention, the viscosity and the fluidity can be accurately regulated and controlled within a wide temperature range, and the rheological property and the skin feeling experience of the product are remarkably improved.

Description

Technical Field

[0001] The invention belongs to the technical field of skin care product components and relates to a skin care product, in particular to a skin care product with excellent rheological properties and skin feel and a preparation method thereof. Background Art

[0002] As consumers' requirements for skin care quality continue to increase, the experience of using skin care products has become one of the key factors in consumer acceptance. The rheological properties of skin care products and their performance at different temperatures have become important indicators for measuring product performance.

[0003] Rheology is the science of studying the deformation and flow of materials under the action of external forces. For skin care products, rheological properties cover multiple aspects such as the viscosity, elasticity, and thixotropy of the product, which are directly related to the actual application effect of the product. Among them, viscosity, as an important indicator to measure the resistance to the flow of materials, has a direct impact on the smoothness of the application of skin care products. Viscosity that is too high or too low will affect consumers' pursuit of ease of use and skin feel. Therefore, how to achieve precise control of viscosity while maintaining the stability of skin care products has become an important direction for the research and development of skin care products. In addition, dynamic viscoelasticity is a key factor in determining the ductility and absorption efficiency of skin care products. By optimizing the relationship between the storage modulus and the loss modulus of skin care products at different temperatures, the stability of skin care products during storage and the skin feel during application can be improved.

[0004] However, most existing skin care products have poor rheological properties, and it is difficult to maintain good stability in a wide temperature range and provide an excellent user experience. For example, patent CN113786357A uses a reasonable combination of sunscreen, oil, rheology regulator and skin feel regulator to make the skin feel refreshing and non-greasy, but it is difficult to meet the requirements for product rheological properties under different temperature conditions. Although the rheology regulators mentioned in the patent (such as polydimethylsiloxane / bis-isobutyl PPG-20 crosslinked polymer, etc.) can improve the rheological properties of the product to a certain extent, there is a lack of in-depth discussion on the temperature-dependent characteristics of rheological properties, and it does not have the ability to intelligently adjust viscosity and fluidity with temperature changes.

[0005] In view of this, there is an urgent need to develop a new skin care product to solve at least some of the above-mentioned defects in existing products. Summary of the invention

[0006] The present invention provides a skin care product with excellent rheological properties and skin feel and a preparation method thereof, which can solve the problems of single rheological properties and poor skin feel commonly existing in skin care products on the current market.

[0007] To solve the above technical problem, according to one aspect of the present invention, the following technical solution is adopted:

[0008] A skin care product with excellent rheological properties and skin feel, comprising: 6.5-25% by weight of oil, 7.45-30% by weight of moisturizer, 1.2-15% by weight of emollient, 1.2-15% by weight of emulsifier, 0.2-8% by weight of thickener, 0.1-25% by weight of functional ingredients, and the remainder being water.

[0009] As an embodiment of the present invention, the skin care product includes a plurality of oils with different melting point gradients.

[0010] As an embodiment of the present invention, the oil contained in the skin care product includes:

[0011] Oils and fats with a melting point below 0°C, including at least one of undecane, isododecane, tridecane, isohexadecane, squalane, almond oil, caprylate, and caprylic / capric triglyceride;

[0012] The oil having a melting point of 0-25°C is selected from at least one of isononyl isononanoate, isodecyl isononanoate, isopropyl isostearate, olive oil, oat kernel oil, jojoba oil, ethyl palmitate, isopropyl palmitate and ethylhexyl palmitate;

[0013] The oil with a melting point of 25-50° C. is selected from at least one of avocado tree butter, mango seed butter, cocoa seed butter, wild mango kernel butter, palm oil and palm kernel oil.

[0014] As an embodiment of the present invention, under room temperature conditions, through the synergistic effect of a set ratio of emulsifier, thickener and oil, the skin care product exhibits solid and high viscosity characteristics, ensuring its stability during storage;

[0015] The viscosity of the skin care product decreases sharply as the temperature increases at a temperature between 30 and 40°C;

[0016] The rheological properties of the skin care product meet the following conditions: at room temperature, the storage modulus is significantly higher than the loss modulus; and at a temperature close to body temperature, the storage modulus is equivalent to the loss modulus.

[0017] As an embodiment of the present invention, the skin care product includes: 6.5-20% by weight of oil, 7.45-20% by weight of moisturizer, 1.2-10% by weight of emollient, 4-10% by weight of emulsifier, 0.5-5% by weight of thickener, 5-20% by weight of effective ingredients, and the balance is water.

[0018] As an embodiment of the present invention, the moisturizer is selected from at least one of glycerol, propylene glycol, 1,3-propanediol, butylene glycol, 1,3-butylene glycol, 1,2-pentanediol, erythritol, sorbitol, xylitol, sodium pyrrolidonecarboxylate (sodium PCA), trehalose, sodium hyaluronate, and panthenol.

[0019] As an embodiment of the present invention, the emollient is selected from at least one of polymethylsiloxane, caprylyl polymethylsiloxane, vinyl polydimethylsiloxane, cyclohexasiloxane, cyclomethicone, methyl glucose sesquistearate, glyceryl stearate citrate, polydimethylsiloxane, polydimethylsiloxane alcohol, polymethylsilsesquioxane, and stearyl polydimethylsiloxane.

[0020] As an embodiment of the present invention, the emulsifier is selected from at least one of phytosterol / behenyl alcohol / octyldecyl lauroyl glutamate, glyceryl stearate, stearyl alcohol, cetyl alcohol, polysorbate-20, polysorbate-60, polysorbate-80, behenyl alcohol, stearic acid, cetearyl alcohol, cetearyl glucoside, PEG-100 stearate, sorbitan oleate, sorbitan stearate, sorbitan olive oil ester, and sorbitan sesquioleate.

[0021] As an embodiment of the present invention, the thickener is selected from at least one of sodium acrylate / sodium acryloyldimethyl taurate copolymer, acrylic acid (ester) / C10-30 alkyl acrylate cross-linked polymer, ammonium acryloyldimethyl taurate / VP copolymer, hydroxyethyl acrylate / sodium acryloyldimethyl taurate copolymer, hydroxypropyl methylcellulose, and methyl hydroxyethyl cellulose.

[0022] As an embodiment of the present invention, the effective ingredients are selected from at least one of Dunaliella salina, hexapeptide-11, palmitoyl tripeptide-5, filtrate of leuconostoc / radish root fermentation product, filtrate of rice fermentation product, lysate of bifid yeast fermentation product, fermentation product of Thermus thermophilus, fermentation lysate of lactic acid bacteria, Fleischer's epilobium extract, niacinamide, panthenol, acetylated sodium hyaluronate, apple fruit cell culture extract, filtrate of callus culture of Eryngium littoralis, acetyl tetrapeptide-5, rose extract, bird's nest acid, cono peptide, Gynostemma pentaphyllum extract, sodium trehalose sulfate, pine mushroom extract, black truffle extract, white truffle extract, and papaya extract.

[0023] As an embodiment of the present invention, the skin care products include lotion, skin cream and essence.

[0024] According to another aspect of the present invention, the following technical solution is adopted: a method for preparing the above-mentioned skin care product, the preparation method comprising:

[0025] Step a, obtaining a water phase: placing water in a container with a stirring device, fully wetting and mixing the humectant and thickener, adding them into the water, stirring until completely dissolved, and heating to 75-80°C;

[0026] Step b, obtaining the oil phase: mixing the oil, emollient and emulsifier, heating to 75-80°C, and stirring until completely dissolved;

[0027] Step c, emulsification: add the mixture of step b to the aqueous phase of step a, stir at 250-350 rpm for 5-10 minutes and homogenize at 2500-3500 rpm for 3-10 minutes;

[0028] Step f: when the temperature is 35-40° C., add the functional ingredients and stir at 250-350 rpm for 5-10 minutes to obtain the desired skin care product.

[0029] In one use scenario of the present invention, the preparation method further comprises between step c and step f:

[0030] Step d, adjusting pH value: adding pH adjusting agent, stirring at 250-350 rpm for 5-10 minutes and homogenizing at 2500-3500 rpm for 3-10 minutes, stirring and cooling to 40-45° C.;

[0031] Step e: adding fragrance and preservative, stirring at 250-350 rpm for 3-5 minutes and homogenizing at 2500-3500 rpm for 3-10 minutes.

[0032] The beneficial effect of the present invention is that the skin care products with excellent rheological properties and skin feel and the preparation method thereof proposed in the present invention can solve the problems of single rheological properties and poor skin feel commonly existing in the skin care products on the current market.

[0033] The skin care products of the present invention can achieve precise control of viscosity and fluidity in a wide temperature range, significantly improving the rheological properties and skin feel experience of the products. Under room temperature conditions, through the synergistic effect of emulsifiers, thickeners and oils in a specific proportion, the skin care products present solid and high viscosity characteristics, ensuring their stability during storage. Under conditions close to body temperature, as the temperature rises, the performance of the emulsifier changes, reducing the cohesion and viscosity of the system, and synergizing with the emollient, the viscosity of the skin care products is significantly reduced, the fluidity is significantly enhanced, and it is easy to apply and absorb, achieving a silky touch and avoiding greasy residue. In addition, the specific oils in the skin care products gradually melt during the temperature increase process, and the fluidity is enhanced, which cooperates with the transformation of the emulsifier to further enhance the skin feel experience of the skin care products when applied. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The present invention is a flowchart of a method for preparing a skin care product in one embodiment of the present invention.

[0035] Figure 2 This is a temperature-viscosity change curve of Example 1 in the rheological properties experiment.

[0036] Figure 3 This is a temperature-viscosity change curve of Example 2 in the rheological properties experiment.

[0037] Figure 4 This is a temperature-viscosity change curve of Example 3 in the rheological properties experiment.

[0038] Figure 5 This is a temperature-viscosity change curve of Example 4 in the rheological properties experiment.

[0039] Figure 6 This is a temperature-viscosity change curve of Example 5 in the rheological properties experiment.

[0040] Figure 7 It is the temperature-viscosity change curve of comparative example 1 in the rheological properties experiment.

[0041] Figure 8 It is the temperature-viscosity change curve of comparative example 2 in the rheological properties experiment.

[0042] Fig. 9 It is the temperature-viscosity change curve of comparative example 3 in the rheological properties experiment.

[0043] Fig.10 It is the temperature-viscosity change curve of comparative example 4 in the rheological properties experiment.

[0044] Fig.11 This is the angular frequency-modulus curve of Example 1 at 25°C in the rheological properties experiment.

[0045] Fig.12 This is the angular frequency-modulus curve of Example 1 at 37°C in the rheological properties experiment.

[0046] Fig.13 It is a radar chart of the skin feel test scores of the subjects of Examples 1-5 and Comparative Examples 1-4. DETAILED DESCRIPTION

[0047] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0048] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0049] The description in this section is only for several typical embodiments, and the present invention is not limited to the scope of the embodiments. The same or similar prior art means and some technical features in the embodiments are mutually replaced within the scope of the present invention.

[0050] Unless otherwise indicated, implied from the context, or customary in the prior art, all parts and percentages in this application are based on weight, and the test and characterization methods used are all current as of the filing date of this application. Where applicable, the contents of any patent, patent application or publication referred to in this application are fully incorporated herein by reference, and their equivalent patent families are also incorporated by reference, especially the definitions of synthesis techniques, product and processing designs, polymers, comonomers, initiators or catalysts disclosed in these documents in the art. If the definition of a specific term disclosed in the prior art is inconsistent with any definition provided in this application, the definition of the term provided in this application shall prevail.

[0051] Numerical ranges in this application are approximate values, so unless otherwise specified, they may include numerical values ​​outside the range. Numerical ranges include all numerical values ​​from the lower limit to the upper limit increased by 1 unit, provided that there is an interval of at least 2 units between any lower value and any higher value. For example, if the recorded component, physical or other properties (such as molecular weight, melt index, etc.) are 100 to 1000, it means that all single values ​​are clearly listed, such as 100, 101, 102, etc., and all sub-ranges, such as 100 to 166, 155 to 170, 198 to 200, etc. For a range containing a numerical value less than 1 or containing a fraction greater than 1 (such as 1.1, 1.5, etc.), 1 unit is appropriately regarded as 0.0001, 0.001, 0.01 or 0.1. For a range containing a single digit less than 10 (such as 1 to 5), 1 unit is usually regarded as 0.1. These are only specific examples of what is intended to be expressed, and all possible combinations of values ​​between the lowest and highest values ​​listed are considered to be clearly recorded in this application. It should also be noted that the terms "first", "second", etc. in this article do not limit the order of precedence, but are only used to distinguish substances with different structures.

[0052] When used with respect to chemical compounds, unless expressly specified otherwise, the singular includes all isomeric forms and vice versa (e.g., "hexane" includes all isomers of hexane, individually or collectively). In addition, nouns using "a," "an," or "the" also include their plural forms unless expressly specified otherwise.

[0053] The terms "comprising", "including", "having" and their derivatives do not exclude the presence of any other components, steps or processes, and are irrelevant to whether these other components, steps or processes are disclosed in this application. To eliminate any doubt, unless explicitly stated, all compositions using the terms "comprising", "including", or "having" in this application may include any additional additives, adjuvants or compounds. On the contrary, except for those necessary for operating performance, the term "essentially consisting of..." excludes any other components, steps or processes from the scope of any description of the term below. The term "consisting of..." does not include any components, steps or processes that are not specifically described or listed. Unless explicitly stated, the term "or" refers to the listed individual members or any combination thereof.

[0054] The description of the steps in each embodiment in the specification is only for the convenience of explanation, and the implementation method of the present application is not limited by the order of implementation of the steps.

[0055] The invention discloses a skin care product with excellent rheological properties and skin feel, comprising: 6.5-25% by weight of oil, 7.45-30% by weight of moisturizer, 1.2-15% by weight of emollient, 1.2-15% by weight of emulsifier, 0.2-8% by weight of thickener, 0.1-25% by weight of functional ingredients, and the remainder being water.

[0056] In one embodiment of the present invention, the skin care product includes: 6.5-20% by weight of oil, 7.45-20% by weight of moisturizer, 1.2-10% by weight of emollient, 4-10% by weight of emulsifier, 0.5-5% by weight of thickener, 5-20% by weight of effective ingredients, and the remainder is water. The effective ingredients can be selected from at least one of Dunaliella salina, hexapeptide-11, palmitoyl tripeptide-5, leuconostoc / radish root fermentation product filtrate, rice fermentation product filtrate, bifid yeast fermentation product lysate, Thermus thermophilus fermentation product, lactic acid bacteria fermentation lysate, Fleischer's epilobium extract, niacinamide, panthenol, acetylated sodium hyaluronate, apple fruit cell culture extract, Eryngium maritima callus culture filtrate, acetyl tetrapeptide-5, rose extract, swiftlet acid, cono peptide, Gynostemma pentaphyllum extract, sodium trehalose sulfate, pine mushroom extract, black truffle extract, white truffle extract, and papaya extract.

[0057] In one embodiment of the present invention, the skin care product comprises a plurality of oils with different melting point gradients. In one embodiment, the oils are specifically distributed as follows:

[0058] Oils and fats with a melting point below 0°C, including at least one of undecane, isododecane, tridecane, isohexadecane, squalane, almond oil, caprylate, and caprylic / capric triglyceride;

[0059] The oil having a melting point of 0-25°C is selected from at least one of isononyl isononanoate, isodecyl isononanoate, isopropyl isostearate, olive oil, oat kernel oil, jojoba oil, ethyl palmitate, isopropyl palmitate and ethylhexyl palmitate;

[0060] The oil with a melting point of 25-50° C. is selected from at least one of avocado tree butter, mango seed butter, cocoa seed butter, wild mango kernel butter, palm oil and palm kernel oil.

[0061] At room temperature, through the synergistic effect of the set proportion of emulsifiers, thickeners and oils, the skin care products present solid and high viscosity characteristics, ensuring their stability during storage. The viscosity of the skin care products decreases sharply with the increase of temperature at a temperature between 30 and 40°C. The rheological properties of the skin care products meet the following conditions: at room temperature, the storage modulus is significantly higher than the loss modulus; and at close to body temperature, the storage modulus is equivalent to the loss modulus.

[0062] The moisturizer can be selected from at least one of glycerin, propylene glycol, 1,3-propanediol, butylene glycol, 1,3-butylene glycol, 1,2-pentanediol, erythritol, sorbitol, xylitol, sodium pyrrolidonecarboxylate (sodium PCA), trehalose, sodium hyaluronate, and panthenol.

[0063] The emollient may be selected from at least one of methylsiloxane, octyl methylsiloxane, vinyl dimethicone, cyclohexasiloxane, cyclomethicone, methyl glucose sesquistearate, glyceryl stearate citrate, dimethicone, dimethiconol, polymethylsilsesquioxane, and stearyl dimethicone.

[0064] The emulsifier can be selected from at least one of phytosterol / behenyl alcohol / octyldecyl lauroyl glutamate, glyceryl stearate, stearyl alcohol, cetyl alcohol, polysorbate-20, polysorbate-60, polysorbate-80, behenyl alcohol, stearic acid, cetearyl alcohol, cetearyl glucoside, PEG-100 stearate, sorbitan oleate, sorbitan stearate, sorbitan olive oil ester, and sorbitan sesquioleate.

[0065] The thickener can be selected from at least one of sodium acrylate / sodium acryloyldimethyl taurate copolymer, acrylic acid (ester) / C10-30 alkyl acrylate cross-linked polymer, ammonium acryloyldimethyl taurate / VP copolymer, hydroxyethyl acrylate / sodium acryloyldimethyl taurate copolymer, hydroxypropyl methylcellulose, and methyl hydroxyethyl cellulose.

[0066] The skin care products may include lotions, skin care creams, essences, etc.; wherein the skin care creams may be face creams, eye creams, hand creams, etc.

[0067] The present invention further discloses a method for preparing the above skin care product. Figure 1 is a flow chart of a method for preparing a skin care product according to an embodiment of the present invention; Figure 1 , the preparation method comprises:

[0068] Step a, obtaining a water phase: placing water in a container with a stirring device, fully wetting and mixing the humectant and thickener, adding them into the water, stirring until completely dissolved, and heating to 75-80°C;

[0069] Step b, obtaining the oil phase: mixing the oil, emollient and emulsifier, heating to 75-80°C, and stirring until completely dissolved;

[0070] Step c, emulsification: add the mixture of step b to the aqueous phase of step a, stir at 250-350 rpm for 5-10 minutes and homogenize at 2500-3500 rpm for 3-10 minutes;

[0071] Step f: when the temperature is 35-40° C., add the functional ingredients and stir at 250-350 rpm for 5-10 minutes to obtain the desired skin care product.

[0072] In one embodiment of the present invention, the preparation method further comprises between step c and step f:

[0073] Step d, adjusting pH value: adding pH adjusting agent, stirring at 250-350 rpm for 5-10 minutes and homogenizing at 2500-3500 rpm for 3-10 minutes, stirring and cooling to 40-45° C.;

[0074] Step e: adding fragrance and preservative, stirring at 250-350 rpm for 3-5 minutes and homogenizing at 2500-3500 rpm for 3-10 minutes.

[0075] Examples 1-5

[0076] This embodiment provides a facial cream with excellent rheological properties and skin feel, wherein the facial cream includes a key ingredient that can adjust the rheological properties.

[0077] The raw material components (mass percentage) of the facial cream provided in this embodiment are shown in Table 1.

[0078] Table 1 Components and dosage of Examples 1-5

[0079]

[0080]

[0081] The specific preparation method of the facial cream comprises the following steps:

[0082] a. Obtaining the aqueous phase: placing water in a container with a stirring device, fully moistening and mixing the humectants No. 2-7 and the thickener No. 8, add them to the water, stir until completely dissolved, and heat to 75-80°C;

[0083] b. Obtain the oil phase; mix the oils No. 9-12, the emollients No. 13-16, and the emulsifiers No. 17-25, heat to 75-80°C, and stir until completely dissolved;

[0084] c. Emulsification: Add the mixture of step b to the aqueous phase of step a, stir at 350 rpm for 5 minutes and homogenize at 3500 rpm for 5 minutes;

[0085] d. Adjust pH value: add pH adjuster No. 26, stir at 250 rpm for 5 minutes and homogenize at 2500 rpm for 3 minutes, and cool to 40-45°C with stirring;

[0086] e. Add the (daily use) flavor No. 27 and the preservative No. 28-29, stir at 250 rpm for 5 minutes and homogenize at 2500 rpm for 3 minutes;

[0087] f. When the temperature is 35-40°C, add the active ingredients and stir at 250 rpm for 10 minutes to obtain the desired cream.

[0088] The above embodiments are merely examples, and the amount of each component of the facial cream of the present invention can be adjusted according to actual needs to achieve the best performance and skin feel effect.

[0089] Comparative Examples 1-4

[0090] The oil and fat content by mass percentage of Comparative Example 1 are 1.5% squalane, 3% avocado oil, 0.5% isopropyl isostearate, and 0.5% avocado tree (BUTYROSPERMUM PARKII) fruit fat; other ingredients remain unchanged.

[0091] The oil and fat content by mass percentage of Comparative Example 2 are 8% squalane, 8% avocado oil, 6% isopropyl isostearate, and 6% avocado tree (BUTYROSPERMUM PARKII) fruit fat; other ingredients remain unchanged.

[0092] The types and mass percentage contents of the emulsifiers in Comparative Example 3 are respectively 4% of cetearyl alcohol, 4% of cetearyl glucoside, 4% of glyceryl stearate, 2% of stearic acid, 2% of sorbitan olivate, and 1% of behenyl alcohol; the other ingredients remain unchanged.

[0093] The types and mass percentages of the emulsifiers in Comparative Example 4 are respectively 0.2% of cetearyl alcohol, 0.2% of cetearyl glucoside, 0.2% of glyceryl stearate, 0.1% of stearic acid, 0.2% of sorbitan olivate, and 0.1% of behenyl alcohol; the other ingredients remain unchanged.

[0094] Effect verification

[0095] Rheological properties experiment

[0096] 1. Temperature-viscosity change curve test

[0097] The MCR 301 (Anton Paar) rotational rheometer was used to measure the viscosity change of the cream at different temperatures and test its rheological properties.

[0098] Test sample: the cream of Examples 1-5 described in Table 1

[0099] Experimental equipment: MCR 301 (Anton Paar) rotational rheometer

[0100] Experimental method: Place the sample in the equipment container and set the experimental parameters: oscillation frequency is 1 rad / s, amplitude is set to 0.1%, rotation speed is 5 seconds / revolution; the test starting temperature is 25°C, and the temperature is raised uniformly at a rate of 1°C / min until the temperature reaches 45°C. Measure the viscosity of the sample in sequence according to the operating procedures of the rotational viscometer. Draw the temperature-viscosity curve according to the viscosity values ​​at different temperature points.

[0101] The experimental results are as follows Figure 2-Figure 10 As shown, as the temperature gradually increases from 25°C to 45°C, the temperature-viscosity curves of the creams of Examples 1-5 show similar changing trends, that is, the viscosity decreases significantly when the temperature rises (especially at 32-37°C), indicating that the fluidity of the sample increases with increasing temperature. This temperature sensitivity may bring a better skin feel experience, that is, it has a good touch and consistency at low temperatures, and is easy to apply and absorb at body temperature. In contrast, the viscosity of the creams in Comparative Examples 1-4 changes less with temperature and does not show a significant downward trend. Under conditions close to body temperature, the viscosity is still high, and it may feel too thick or greasy when applied, and it is difficult to push away, resulting in a poor skin feel experience.

[0102] 2. Angular frequency-modulus curve test

[0103] The storage modulus (G') and loss modulus (G") of the cream at different temperatures and angular frequencies were measured using an MCR 301 (Anton Paar) rotational rheometer to analyze the elasticity and viscosity of the cream.

[0104] Test sample: the cream of Example 1 described in Table 1

[0105] Experimental equipment: MCR 301 (Anton Paar) rotational rheometer

[0106] Experimental process:

[0107] (1) Angular frequency-modulus test (25°C):

[0108] Set the rheometer temperature to 25°C, spread the sample evenly on the measuring plate and stabilize it for a while to ensure uniform sample temperature. Set the angular frequency range to 0.01-100 rad / s and the strain to 1%. Start the test and plot the storage modulus (G') and loss modulus (G") at 25°C as a function of angular frequency.

[0109] (2) Angular frequency-modulus test (37°C):

[0110] Set the rheometer temperature to 37°C, spread the sample evenly on the measuring plate and stabilize it for a while to ensure uniform sample temperature. Set the angular frequency range to 0.01-100 rad / s and the strain to 1%. Start the test and plot the storage modulus (G') and loss modulus (G") at 37°C as a function of angular frequency.

[0111] The experimental results are as follows Fig.11 , Fig.12 As shown, at room temperature, the cream in Example 1 exhibits typical soft solid rheological behavior, has strong elastic properties, and the storage modulus (G') is significantly higher than the loss modulus (G"). However, at 37°C, this elastic behavior is significantly weakened, and G' and G" are very close, indicating that the sample exhibits more liquid properties. This rheological property makes the cream in Example 1 not only easy to spread and absorb when used, but also provides a light and refreshing skin feel experience.

[0112] Stability test

[0113] (1) Test sample: the creams of Examples 1-5 and Comparative Examples 1-4 described in Table 1

[0114] (2) Test method: The samples were subjected to stability tests at room temperature (25°C), high temperature (45°C) and low temperature (-15°C) for three months. The samples were taken out regularly and restored to room temperature and their shapes were observed.

[0115] Table 2 Stability test results

[0116]

[0117] Test results: The results in Table 2 show that Examples 1-5 exhibit excellent stability under room temperature, high temperature and low temperature storage conditions, and no precipitation, stratification, color change or texture change occurred within three months. Comparative Example 1 also remained stable under the same conditions, but Comparative Examples 2, 3, and 4 showed different degrees of oil precipitation during storage, especially after two months of storage. This shows that when the type and content of emulsifiers and oils exceed the range specified in the present invention, the stability of the skin care product is significantly reduced.

[0118] Sensory evaluation test

[0119] The skin feel of the cream is evaluated through consumers' subjective feelings, including smoothness of application, soft texture, moisturizing effect, absorption speed, and overall liking.

[0120] (1) Test samples: Examples 1-5 and Comparative Examples 1-4 described in Table 1.

[0121] (2) Number of participants: 40 participants, half male and half female, aged between 18 and 45 years old, all meeting the criteria for subjects.

[0122] (3) Test method:

[0123] 1) Before the formal test, each subject needs to cleanse the face thoroughly and wait at room temperature for at least 15 minutes to ensure that the skin is in a natural state and there is no residue that can affect the test results.

[0124] 2) Using a randomized double-blind method, each subject will try four creams in turn, with at least 30 minutes between each trial to avoid the influence of the previous test on product evaluation.

[0125] 3) Evaluation indicators and scoring: The subjects independently scored each cream based on the following five descriptive words and their definitions. The full score for each indicator is 5 points, and the higher the score, the more positive the evaluation.

[0126] Smoothness of application: Evaluate whether the cream slides smoothly on the skin and is easy to spread evenly.

[0127] Soft texture: Feel how soft and delicate the cream is when you touch it, and whether it is comfortable and not rough.

[0128] Moisturizing effect: Evaluate the long-lasting moisturizing and nourishing feeling that the cream brings to the skin.

[0129] Absorption rate: Record how quickly the cream is absorbed by the skin and whether it leaves a greasy feeling after absorption.

[0130] Overall liking: taking all the above factors into consideration, the overall satisfaction and preference for the product.

[0131] 4) Data collection and analysis: The scoring data of all subjects were collected using statistical software.

[0132] The experimental results are as follows Fig.13 As shown, it is shown that Examples 1-5 are significantly better than Comparative Examples 1-4 in terms of smoothness of application, soft texture, moisturizing effect, absorption speed and overall liking. Specifically, the creams of Examples 1-5 generally scored higher in terms of smoothness of application. The subjects generally reflected that these creams slid smoothly on the skin without obstruction and were easy to push evenly, which was significantly better than Comparative Examples 1-4, among which Comparative Examples 1 and Comparative Example 3 scored lower due to the dragging feeling during the application process. In terms of soft texture, the creams of the embodiments also performed well, feeling soft and delicate when touched, without a rough feeling, while the comparative products appeared to be relatively rough, especially Comparative Examples 2 and Comparative Examples 4 scored lower in this item. In terms of moisturizing effect, the creams of the embodiments brought obvious lasting moisturizing and moisturizing feelings to the skin. The subjects reported that the skin remained moisturized after use, while the comparative creams were relatively weak in moisturizing effect and the moisturizing time was not long. In terms of absorption speed, the creams of the embodiments were quickly absorbed by the skin, and there was no greasy feeling after absorption, and the overall skin felt refreshing, while the comparative products absorbed slowly, and some products even left a greasy feeling. Finally, in terms of overall liking, after comprehensively considering various factors, the subjects had a higher overall satisfaction and preference for the example cream, while the comparison cream had a low overall liking score due to its poor performance in many aspects.

[0133] In summary, the skin care products with excellent rheological properties and skin feel and the preparation method thereof proposed in the present invention can solve the problems of single rheological properties and poor skin feel commonly existing in the skin care products on the current market.

[0134] The skin care products of the present invention can achieve precise control of viscosity and fluidity within a wide temperature range, significantly improving the rheological properties and skin feel experience of the products. Under room temperature conditions, through the synergistic effect of emulsifiers, thickeners and oils in a specific proportion, the skin care products present solid and high viscosity characteristics, ensuring their stability during storage. Under conditions close to body temperature, as the temperature rises, the performance of the emulsifier changes, reducing the cohesion and viscosity of the system, and synergizing with the emollient, the fluidity of the skin care products is significantly enhanced, easy to apply and absorb, achieving a silky touch and avoiding greasy residue. In addition, the specific oils in the skin care products gradually melt during the temperature increase process, and the fluidity is enhanced, which cooperates with the transformation of the emulsifier to further enhance the skin feel experience of the skin care products when applied.

[0135] At room temperature, skin care products maintain an appropriate viscosity to ensure their stability and lasting moisturizing effect; when exposed to a temperature close to human skin, the viscosity is significantly reduced, the fluidity of skin care products is enhanced, and they have good ductility and absorption efficiency. At the same time, skin care products have good thixotropy, and their internal structure changes during application, and their fluidity is significantly improved, achieving a uniform and smooth application experience.

[0136] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0137] The description and application of the present invention here are illustrative, and it is not intended to limit the scope of the present invention to the above-mentioned embodiments. The effects or advantages involved in the embodiments may not be embodied in the embodiments due to interference from various factors, and the description of the effects or advantages is not used to limit the embodiments. The deformation and change of the embodiments disclosed here are possible, and the replacement of the embodiments and the various equivalent parts are well known to those of ordinary skill in the art. It should be clear to those skilled in the art that the present invention can be implemented in other forms, structures, arrangements, proportions, and with other components, materials and parts without departing from the spirit or essential features of the present invention. Other deformations and changes can be made to the embodiments disclosed here without departing from the scope and spirit of the present invention.

Claims

1. A skin care product with excellent rheological properties and skin feel, characterized in that: The skin care product comprises: 6.5-25% by weight of oil, 7.45-30% by weight of moisturizer, 1.2-15% by weight of emollient, 1.2-15% by weight of emulsifier, 0.2-8% by weight of thickener, 0.1-25% by weight of functional ingredients, and the balance is water.

2. The skin care product with excellent rheological properties and skin feel according to claim 1, characterized in that: The skin care product comprises a plurality of oils with different melting point gradients.

3. The skin care product with excellent rheological properties and skin feel according to claim 2, characterized in that: The oils and fats contained in the skin care products include: Oils and fats with a melting point below 0°C, including at least one of undecane, isododecane, tridecane, isohexadecane, squalane, almond oil, caprylate, and caprylic / capric triglyceride; The oil having a melting point of 0-25°C is selected from at least one of isononyl isononanoate, isodecyl isononanoate, isopropyl isostearate, olive oil, oat kernel oil, jojoba oil, ethyl palmitate, isopropyl palmitate and ethylhexyl palmitate; The oil with a melting point of 25-50° C. is selected from at least one of avocado tree butter, mango seed butter, cocoa seed butter, wild mango kernel butter, palm oil and palm kernel oil.

4. The skin care product with excellent rheological properties and skin feel according to claim 1, characterized in that: At room temperature, through the synergistic effect of emulsifiers, thickeners and oils in a set ratio, skin care products present solid and high viscosity characteristics, ensuring their stability during storage; The viscosity of the skin care product decreases sharply as the temperature increases at a temperature between 30 and 40°C; The rheological properties of the skin care product meet the following conditions: at room temperature, the storage modulus is significantly higher than the loss modulus; and at a temperature close to body temperature, the storage modulus is equivalent to the loss modulus.

5. The skin care product with excellent rheological properties and skin feel according to claim 1, characterized in that: The skin care product comprises: 6.5-20% by weight of oil, 7.45-20% by weight of moisturizer, 1.2-10% by weight of emollient, 4-10% by weight of emulsifier, 0.5-5% by weight of thickener, 5-20% by weight of functional ingredients, and the balance is water.

6. The skin care product with excellent rheological properties and skin feel according to claim 1, characterized in that: The moisturizing agent is selected from at least one of glycerin, propylene glycol, 1,3-propylene glycol, butylene glycol, 1,3-butylene glycol, 1,2-pentanediol, erythritol, sorbitol, xylitol, sodium pyrrolidone carboxylate (sodium PCA), trehalose, sodium hyaluronate, and panthenol; The emollient is selected from at least one of methylsiloxane, octyl methylsiloxane, vinyl dimethicone, cyclohexasiloxane, cyclomethicone, methyl glucose sesquistearate, glyceryl stearate citrate, dimethicone, dimethiconol, polymethylsilsesquioxane, and stearyl dimethicone; The emulsifier is selected from at least one of phytosterol / behenyl alcohol / octyldecyl lauroyl glutamate, glyceryl stearate, stearyl alcohol, cetyl alcohol, polysorbate-20, polysorbate-60, polysorbate-80, behenyl alcohol, stearic acid, cetearyl alcohol, cetearyl glucoside, PEG-100 stearate, sorbitan oleate, sorbitan stearate, sorbitan olive oil ester, and sorbitan sesquioleate; The thickener is selected from at least one of sodium acrylate / sodium acryloyldimethyl taurate copolymer, acrylic acid (ester) / C10-30 alkyl acrylate cross-linked polymer, ammonium acryloyldimethyl taurate / VP copolymer, hydroxyethyl acrylate / sodium acryloyldimethyl taurate copolymer, hydroxypropyl methylcellulose, and methyl hydroxyethyl cellulose.

7. The skin care product with excellent rheological properties and skin feel according to claim 1, characterized in that: The effective ingredients are selected from at least one of Dunaliella salina, hexapeptide-11, palmitoyl tripeptide-5, leuconostoc / radish root fermentation product filtrate, rice fermentation product filtrate, bifid yeast fermentation product lysate, Thermus thermophilus fermentation product, lactic acid bacteria fermentation lysate, Fleischer's epilobium extract, niacinamide, panthenol, acetylated sodium hyaluronate, apple fruit cell culture extract, Eryngium maritima callus culture filtrate, acetyl tetrapeptide-5, rose extract, swiftlet acid, cono peptide, Gynostemma pentaphyllum extract, sodium trehalose sulfate, pine mushroom extract, black truffle extract, white truffle extract, and papaya extract.

8. The skin care product with excellent rheological properties and skin feel according to any one of claims 1 to 7, characterized in that ； The skin care products include lotions, skin creams and essences.

9. A method for preparing the skin care product according to any one of claims 1 to 8, characterized in that: The preparation method comprises: Step a, obtaining a water phase: placing water in a container with a stirring device, fully wetting and mixing the humectant and thickener, adding them into the water, stirring until completely dissolved, and heating to 75-80°C; Step b, obtaining the oil phase: mixing the oil, emollient and emulsifier, heating to 75-80°C, and stirring until completely dissolved; Step c, emulsification: add the mixture of step b to the aqueous phase of step a, stir at 250-350 rpm for 5-10 minutes and homogenize at 2500-3500 rpm for 3-10 minutes; Step f, when the temperature is 35-40° C., add the functional ingredients, and stir at 250-350 rpm for 5-10 minutes to obtain the desired skin care product.

10. The preparation method according to claim 9, characterized in that: The preparation method further comprises between step c and step f: Step d, adjusting pH value: adding pH adjusting agent, stirring at 250-350 rpm for 5-10 minutes and homogenizing at 2500-3500 rpm for 3-10 minutes, stirring and cooling to 40-45° C.; Step e: adding fragrance and preservative, stirring at 250-350 rpm for 3-5 minutes and homogenizing at 2500-3500 rpm for 3-10 minutes.

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