Essence capable of uniformly distributing oil drops and preparation process thereof

Abstract

The invention discloses essence with uniformly distributed oil drops and a preparation process thereof, and relates to the field of cosmetics, the essence comprises a water phase component and an oil phase component, the water phase component comprises 50-99 parts by weight of purified water, 2-30 parts by weight of a moisturizing factor, 0.001-0.2 part by weight of a chelating agent, 0.001-5 parts by weight of a thickening agent, and 0.5-2 parts by weight of a preservative; the oil phase component comprises 1-15 parts by weight of a grease component; the essence is in a transparent state, oil drops are uniformly distributed, and no emulsifier is added, so that the problems of skin allergy, irritation and the like possibly caused by the emulsifier are avoided, the product is more suitable for being used by sensitive skin, the original characteristics of water and oil are reserved, and purer use experience is brought to consumers; the whole product is in a transparent state, oil drops are in a suspended state, and the product can be sprayed and smeared and has unique sense of science and technology and visual attraction.

Description

Technical Field

[0001] This invention relates to the field of cosmetics, and in particular to an essence in which oil droplets can be evenly distributed and its preparation process. Background Technology

[0002] In daily life, many consumers have a need for skincare products that offer both a hydrating and refreshing feel, as well as moisturizing and hydrating effects. Traditional serums often only provide a hydrating sensation, lacking sufficient moisturizing power; while some products containing oils, although achieving a moisturizing effect, suffer from problems such as oil droplet aggregation, a cloudy and opaque appearance, a greasy feel, and uneven application, significantly impacting the consumer experience and the product's market competitiveness.

[0003] Currently, moisturizing serums sold on the market are mainly divided into two categories: water-based moisturizing products and emulsified moisturizing products. Water-based products have a refreshing texture, but lack long-lasting moisturizing ability; emulsified products require the addition of a large amount of emulsifiers to achieve oil-water phase fusion. Although they have a better moisturizing effect, the addition of emulsifiers may cause adverse reactions such as skin allergies, and will also change the original texture of the product, resulting in a thicker texture and affecting the user experience.

[0004] For example, Chinese patent application CN114903822A discloses a moisturizing essence and its preparation method, which achieves emulsification of oil and water phases by adding surfactants. Although it has a certain moisturizing effect, the emulsified product has a milky white or milky appearance and cannot achieve a transparent effect. Moreover, it feels greasy when used, which does not meet the needs of modern consumers for a light texture and transparent appearance essence.

[0005] On the other hand, a whitening essence as described in Chinese patent application CN110403865A, although achieving a transparent appearance, contains no oil phase components at all and cannot provide the moisturizing and water-locking effects of oils, thus having limited effectiveness in dry environments.

[0006] Currently, there is no moisturizing and soothing serum on the market that can achieve a transparent appearance, even oil droplet distribution, and the combined refreshing feel of water and the moisturizing effect of oil without the addition of emulsifiers. Therefore, developing a moisturizing and soothing serum that maintains a transparent appearance, ensures even oil droplet distribution, and eliminates the need for emulsifiers, along with its preparation process, has significant practical value and market implications. Summary of the Invention

[0007] In view of the problems existing in the prior art, the purpose of the present invention is to provide a moisturizing and soothing essence that does not add emulsifiers but has the texture of water and the moisturizing effect of oil, is transparent in appearance, has oil droplets that are evenly distributed and do not aggregate, is easy to use, and can replenish and lock in moisture at any time, as well as the preparation process thereof.

[0008] To achieve the above objectives, the present invention provides an essence in which oil droplets can be evenly distributed, comprising an aqueous phase component and an oil phase component, wherein:

[0009] The aqueous phase composition includes 50-99 parts by weight of purified water, 2-30 parts by weight of moisturizing factor, 0.001-0.2 parts by weight of chelating agent, 0.001-5 parts by weight of thickener, and 0.5-2 parts by weight of preservative.

[0010] The oil phase component includes 1-15 parts by weight of oily components;

[0011] The essence is transparent, with oil droplets evenly distributed and no emulsifiers added.

[0012] Preferably, the moisturizing factor is selected from polyols, polysaccharides, and their combinations, wherein the polyols include at least one of glycerin, propylene glycol, and butylene glycol, and the polysaccharides include at least one of sodium hyaluronate, trehalose, and tremella polysaccharide.

[0013] Preferably, the chelating agent is selected from at least one of EDTA-disodium and EDTA-tetrasodium; the thickener is selected from at least one of polyacrylic acid, gellan gum, acrylate / C10-30 alkanol acrylate crosspolymer, chondrus crispus extract, and sodium polyacrylate; and the preservative is selected from at least one of phenoxyethanol, ethylhexylglycerin, and parabens, or a combination thereof.

[0014] Preferably, the oil phase component is selected from at least one of natural oils, silicone oils, and synthetic oils. The natural oils include at least one of squalane, jojoba oil, soybean oil, and corn oil. The silicone oils include at least one of diphenylpolydimethylsiloxane and trimethylpentaphenyltrisiloxane. The synthetic oils include tocopherol derivatives, dipropylene glycol dibenzoate, and caprylic / capric / succinic acid triglycerides.

[0015] Preferably, the essence further comprises 0.1-5 parts by weight of an active ingredient, wherein the active ingredient is selected from at least one or a combination of dipotassium glycyrrhizate, panthenol, vitamin C, saccharide isomers, and betaine.

[0016] The present invention also provides a method for preparing the above-mentioned transparent moisturizing and soothing essence with uniformly distributed oil droplets, comprising the following steps:

[0017] A. Raw material preparation: Weigh the aqueous and oil phase raw materials according to the proportions;

[0018] B. Pretreatment: Heat the purified water to 60-80℃, add the chelating agent, moisturizing factor and preservative in sequence, stir evenly to obtain an aqueous premix; heat the oil phase raw materials to 55-75℃, stir and mix evenly to obtain an oil phase mixture.

[0019] C. Mixing and dispersing: At a speed of 200-1000 rpm, slowly add the oil phase mixture to the aqueous phase premix and stir continuously for 10-30 minutes to form a coarse dispersion system;

[0020] D. Cooling and setting: Cool the system to room temperature at a rate of 3-7°C per minute, while maintaining a stirring speed of 80-120 rpm.

[0021] E. Packaging and filling: The finished product is filled into containers using aseptic filling equipment.

[0022] Preferably, in step B, the thickener is added to the aqueous premix or after the aqueous premix and the oil mixture are mixed.

[0023] Preferably, in step B, the temperature of the aqueous premix is ​​3-10°C higher than the temperature of the oil mixture.

[0024] Preferably, in step C, the oil phase mixture is slowly added to the aqueous phase premix at a rate of 1-5 mL / min.

[0025] Preferably, the method further includes step F: quality inspection, the inspection items include oil droplet distribution uniformity, transparency, pH value, viscosity and microbial indicators, the oil droplet distribution uniformity is judged by microscopic observation, the transparency is determined by light transmittance measurement, and the qualified standard is light transmittance ≥90%.

[0026] The beneficial effects of this invention are as follows:

[0027] 1. No emulsifier added: This invention does not add emulsifiers, avoiding skin allergies and irritation that may be caused by emulsifiers, making the product more suitable for sensitive skin, while also preserving the original properties of water and oil, bringing consumers a purer user experience.

[0028] 2. Transparent appearance and visible oil droplets: The product of this invention is transparent as a whole, with oil droplets suspended and sprayable, which has a unique sense of technology and visual appeal. Compared with the cloudy appearance of traditional oil-containing products, it is more aesthetically pleasing and meets consumers' expectations for high-end and beautiful skin care products, which helps to enhance the product's competitiveness in the market.

[0029] 3. Uniform oil droplet distribution: Through a special preparation process, this invention achieves uniform dispersion of oil droplets in the product without aggregation, ensuring that the oil and water components can act evenly on the skin with each use, allowing the skin to simultaneously receive the refreshing hydration of water and the deep nourishment of oil, achieving better moisturizing and water-locking effects and enhancing the skin's moisturizing ability.

[0030] 4. Convenient and flexible to use: As a transparent essence product containing an oil phase, this invention is convenient to use. It does not require shaking before use. Consumers can apply it directly to the skin at any time to quickly replenish the skin with moisture and nutrients, meet the needs of daily skin care, and is especially suitable for use in dry environments or when the skin is dehydrated.

[0031] 5. Dual moisturizing and soothing effects: The essence of this invention not only has excellent moisturizing effects, but also has significant soothing functions. Hyaluronidase inhibition experiments have proven that the product of this invention has a good inhibitory effect on hyaluronidase, which can effectively soothe skin discomfort caused by dehydration, environmental irritation, etc. Attached Figure Description

[0032] Figure 1 This is an appearance diagram of the transparent moisturizing and soothing essence with uniformly distributed oil droplets prepared in Example 1 of the present invention. Detailed Implementation

[0033] The present invention will now be described in detail with reference to specific embodiments and accompanying drawings, but the scope of protection of the present invention is not limited to the following embodiments.

[0034] In this invention, a moisturizing and soothing essence that maintains a transparent appearance and uniform oil droplet distribution without the addition of emulsifiers is achieved through specific formulation design and preparation process. This essence, through the synergistic effect of multiple moisturizing factors, combined with special oil phase component selection and precise control of the preparation process, allows oil droplets to be stably and uniformly dispersed in the aqueous phase without the use of traditional emulsifiers, forming a moisturizing and soothing essence with a unique visual effect and user experience.

[0035] The moisturizing and soothing essence of this invention comprises an aqueous phase and an oil phase. The aqueous phase includes purified water, moisturizing factors, chelating agents, thickeners, and preservatives; the oil phase includes various oils and fats. Optionally, the essence of this invention may also contain active ingredients to enhance the product's soothing effect.

[0036] In this invention, the selection of moisturizing factors is crucial to the product's moisturizing effect. Moisturizing factors can be selected from polyols and polysaccharides, as well as their combinations. Small-molecule polyols such as glycerin, propylene glycol, and butylene glycol can quickly penetrate the skin's surface, providing immediate moisturizing effects; large-molecule moisturizing factors such as sodium hyaluronate, trehalose, and tremella polysaccharide can form a water-retaining network on the skin surface, achieving long-lasting moisturization. Through the rational combination of various moisturizing factors, a three-layered moisturizing mechanism—immediate, medium-term, and long-term—can be constructed, significantly improving the product's moisturizing performance.

[0037] In this invention, chelating agents are mainly used to stabilize the product and prevent heavy metal ions from affecting its stability. Commonly used chelating agents include disodium EDTA and tetrasodium EDTA. Thickeners in this invention not only regulate viscosity but, more importantly, physically hinder the movement and aggregation of oil droplets by forming a specific polymer network structure, making them a key component for achieving uniform oil droplet distribution. Suitable thickeners include polyacrylic acid, gellan gum, acrylate / C10-30 alkanol acrylate crosspolymers, *Chlorella vulgaris* extract, and sodium polyacrylate. Preservatives are used to ensure the product's microbial safety and can be used alone or in combination with phenoxyethanol, ethylhexylglycerin, parabens, etc.

[0038] In this invention, the selection of oil phase components is also very important, as different oils have different sensory properties and effects. Natural oils such as squalane, jojoba oil, soybean oil, and corn oil have good moisturizing effects; silicone oils such as diphenylpolydimethylsiloxane and trimethylpentaphenyltrisiloxane not only provide a moisturizing feel but also improve the application feel of the product; synthetic oils such as tocopherol derivatives (such as vitamin E) have both moisturizing and antioxidant effects.

[0039] To enhance the soothing effects of the product, this invention can also add various active ingredients, such as dipotassium glycyrrhizate, panthenol, vitamin C, saccharide isomers, and betaine. These active ingredients not only soothe the skin but also provide multiple benefits such as anti-oxidation and repair, further enhancing the product's skincare value.

[0040] The preparation process of this invention is crucial for achieving a transparent essence with uniformly distributed oil droplets. The specific preparation steps include five main stages: raw material preparation, pretreatment, mixing and dispersion, cooling and setting, and packaging and filling. In the pretreatment stage, temperature control of the aqueous and oil phases is critical; the aqueous phase temperature needs to be slightly higher than the oil phase temperature to facilitate the formation and refinement of oil droplets during subsequent mixing. In the mixing and dispersion stage, the initial dispersion of oil droplets is achieved by controlling the stirring speed and the rate of oil phase addition. In the cooling and setting stage, precisely controlled cooling and stirring speeds maintain the oil droplets in a dispersed state and ultimately set them, forming a stable, transparent essence product.

[0041] The technical solution of the present invention will be described in detail below through specific embodiments:

[0042] Example 1

[0043] An essence in which oil droplets can be evenly distributed, the preparation method of which includes the following steps:

[0044] (1) Raw material preparation: Weigh out 80.05 parts of purified water, 7 parts of glycerin, 0.2 parts of sodium hyaluronate, 0.1 parts of disodium EDTA, 0.05 parts of ethylhexylglycerin, 0.5 parts of phenoxyethanol, 8 parts of diphenylpolydimethylsiloxane, 3 parts of squalane, 0.3 parts of vitamin E, 0.2 parts of polyacrylic acid, 0.2 parts of sugar isomers, 0.2 parts of dipotassium glycyrrhizate and 0.2 parts of arginine.

[0045] (2) Pretreatment: Heat 80.05 parts of pure water to 70°C, and add glycerin, sodium hyaluronate, disodium EDTA, ethylhexylglycerin, phenoxyethanol and polyacrylic acid in sequence. Stir until homogeneous to obtain an aqueous premix. Heat diphenyl polydimethylsiloxane, squalane and vitamin E to 65°C and stir until homogeneous to form an oil phase mixture.

[0046] (3) Mixing and dispersing: At a speed of 500 rpm, the oil phase mixture is slowly added to the aqueous phase premix at a speed of 3 mL / min, and the mixture is stirred for 10 minutes to form a coarse dispersion system.

[0047] (4) Cooling and setting: Cool the system to room temperature at a rate of 5°C per minute, while maintaining a stirring speed of 100 rpm, so that it sets into a transparent essence product with evenly distributed oil droplets.

[0048] (5) Packaging and filling: The finished product is filled into essence bottles using aseptic filling equipment, 100ml per bottle.

[0049] (6) Quality inspection: The uniformity of oil droplet distribution was observed under a microscope. The transmittance was 95.6%, the pH value was 6.8, and the viscosity was 3500 mPa·s. The microbial indicators met the cosmetic safety standards.

[0050] Example 2

[0051] An essence in which oil droplets can be evenly distributed, the preparation method of which includes the following steps:

[0052] (1) Raw material preparation: Weigh out 76.72 parts of purified water, 8 parts of propylene glycol, 0.3 parts of trehalose, 0.15 parts of EDTA-tetrasodium, 0.15 parts of calcium chloride, 0.6 parts of phenoxyethanol-ethylhexylglycerin compound, 7 parts of trimethylpentaphenyltrisiloxane, 5 parts of soybean oil, 0.4 parts of vitamin C, 0.08 parts of gellan gum, 0.1 parts of caramel color, 1 part of panthenol and 0.5 parts of xylitol.

[0053] (2) Pretreatment: 76.72 parts of purified water were heated to 75°C, and propylene glycol, trehalose, EDTA-tetrasodium, calcium chloride, phenoxyethanol-ethylhexylglycerin complex and gellan gum were added in sequence. The mixture was stirred until homogeneous to obtain an aqueous premix. Trimethylpentaphenyltrisiloxane and soybean oil were heated to 68°C and stirred until homogeneous to form an oil phase mixture.

[0054] (3) Mixing and dispersing: At a speed of 400 rpm, the oil phase mixture is slowly added to the aqueous phase premix at a speed of 2 mL / min, and the mixture is stirred for 15 minutes to form a coarse dispersion system.

[0055] (4) Cooling and setting: Cool the homogenized system to room temperature at a rate of 4°C per minute, while maintaining a stirring speed of 90 rpm. Then add vitamin C, caramel color, panthenol and xylitol, and continue stirring for 5 minutes to set it into a transparent essence product with evenly distributed oil droplets.

[0056] (5) Packaging and filling: The finished product is filled into essence bottles using aseptic filling equipment, with each bottle containing 50ml.

[0057] (6) Quality inspection: The uniformity of oil droplet distribution was observed under a microscope. The transmittance was 93.2%, the pH value was 6.5, and the viscosity was 3200 mPa·s. The microbial indicators met the cosmetic safety standards.

[0058] Example 3

[0059] An essence in which oil droplets can be evenly distributed, the preparation method of which includes the following steps:

[0060] (1) Raw material preparation: Weigh out 78.15 parts of purified water, 11 parts of butanediol, 0.4 parts of Tremella polysaccharide, 0.05 parts of EDTA-tetrasodium, 0.8 parts of betaine, 0.6 parts of methylparaben, 2 parts of corn oil, 5 parts of diphenyl polydimethylsiloxane, 0.4 parts of tocopherol acetate, 0.2 parts of acrylic (ester) / C10-30 alkanol acrylate crosspolymer, 0.2 parts of arginine, 0.2 parts of sugar isomers and 1 part of panthenol.

[0061] (2) Pretreatment: 78.15 parts of purified water were heated to 68°C, and butylene glycol, tremella polysaccharide, EDTA-tetrasodium, betaine, methylparaben, and acrylate / C10-30 alkanol acrylate cross-linked polymer were added in sequence. The mixture was stirred until homogeneous to obtain an aqueous premix. Corn oil, diphenyl polydimethylsiloxane, and tocopheryl acetate were heated to 60°C and stirred until homogeneous to form an oil phase mixture.

[0062] (3) Mixing and dispersing: At a speed of 800 rpm, the oil phase mixture is slowly added to the aqueous phase premix at a speed of 4 mL / min, and the mixture is stirred for 20 minutes to form a coarse dispersion system;

[0063] (4) Cooling and setting: Cool the homogenized system to room temperature at a rate of 6°C per minute, while maintaining a stirring speed of 110 rpm. Then add arginine, sugar isomers and panthenol, and continue stirring for 5 minutes to set it into a transparent essence product with evenly distributed oil droplets.

[0064] (5) Packaging and filling: The finished product is filled into essence bottles using aseptic filling equipment, with each bottle containing 30ml.

[0065] (6) Quality inspection: The uniformity of oil droplet distribution was observed under a microscope. The transmittance was 94.8%, the pH value was 6.3, and the viscosity was 3800 mPa·s. The microbial indicators met the cosmetic safety standards.

[0066] Example 4

[0067] An essence in which oil droplets can be evenly distributed, the preparation method of which includes the following steps:

[0068] (1) Raw material preparation: Weigh out 90.85 parts of purified water, 5 parts of glycerin, 0.1 parts of sodium hyaluronate, 0.15 parts of trehalose, 0.05 parts of disodium EDTA, 0.3 parts of phenoxyethanol, 0.05 parts of ethylhexylglycerin, 1.5 parts of jojoba oil, 1.5 parts of diphenylpolydimethylsiloxane, 0.3 parts of polyacrylic acid, 0.3 parts of arginine and 0.3 parts of dipotassium glycyrrhizate.

[0069] (2) Pretreatment: 90.85 parts of purified water were heated to 65°C, and glycerol, sodium hyaluronate, trehalose, EDTA-disodium, phenoxyethanol, ethylhexylglycerin and polyacrylic acid were added in sequence. The mixture was stirred until homogeneous to obtain an aqueous premix. Jojoba oil and diphenyl polydimethylsiloxane were heated to 58°C and stirred until homogeneous to form an oil phase mixture.

[0070] (3) Mixing and dispersing: At a speed of 300 rpm, the oil phase mixture is slowly added to the aqueous phase premix at a speed of 1.5 mL / min, and the mixture is stirred for 12 minutes to form a coarse dispersion system.

[0071] (4) Cooling and setting: Cool the homogenized system to room temperature at a rate of 3.5°C per minute, while maintaining a stirring speed of 85 rpm. Then add arginine and dipotassium glycyrrhizate and continue stirring for 5 minutes to set it into a transparent essence product with evenly distributed oil droplets.

[0072] (5) Packaging and filling: The finished product is filled into essence bottles using aseptic filling equipment, 100ml per bottle.

[0073] (6) Quality inspection: The uniformity of oil droplet distribution was observed under a microscope. The transmittance was 96.7%, the pH value was 6.6, and the viscosity was 2800 mPa·s. The microbial indicators met the cosmetic safety standards.

[0074] Example 5

[0075] An essence in which oil droplets can be evenly distributed, the preparation method of which includes the following steps:

[0076] (1) Raw material preparation: Weigh out 53.2 parts of purified water, 15 parts of propylene glycol, 10 parts of butylene glycol, 0.5 parts of Tremella polysaccharide, 0.15 parts of EDTA-tetrasodium, 0.45 parts of Chondrus crispus extract, 1.5 parts of sodium chloride, 0.7 parts of phenoxyethanol-ethylhexylglycerin complex, 8 parts of trimethylpentaphenyltrisiloxane, 5 parts of squalane, 1.5 parts of vitamin E, 0.5 parts of betaine, 0.5 parts of sugar isomers and 3 parts of panthenol.

[0077] (2) Pretreatment: 53.2 parts of purified water were heated to 78°C, and propylene glycol, butylene glycol, tremella polysaccharide, EDTA-tetrasodium, chondrus crispus extract, and phenoxyethanol-ethylhexylglycerin complex were added in sequence. The mixture was stirred and homogenized to obtain an aqueous premix. Trimethylpentaphenyltrisiloxane, squalane, and vitamin E were heated to 70°C and stirred and mixed to form an oil phase mixture.

[0078] (3) Mixing and dispersing: At a speed of 950 rpm, slowly add the oil phase mixture to the aqueous phase premix at a speed of 5 mL / min, and continue stirring for 25 minutes to form a coarse dispersion system. Add 1.5 parts of sodium chloride and stir evenly.

[0079] (4) Cooling and setting: Cool the homogenized system to room temperature at a rate of 7°C per minute, while maintaining a stirring speed of 120 rpm. Then add betaine, sugar isomers and panthenol, and continue stirring for 8 minutes to set it into a transparent essence product with evenly distributed oil droplets.

[0080] (5) Packaging and filling: The finished product is filled into essence bottles using aseptic filling equipment, with each bottle containing 50ml.

[0081] (6) Quality inspection: The uniformity of oil droplet distribution was observed under a microscope. The transmittance was 92.5%, the pH value was 6.9, and the viscosity was 4200 mPa·s. The microbial indicators met the cosmetic safety standards.

[0082] Example 6

[0083] An essence in which oil droplets can be evenly distributed, the preparation method of which includes the following steps:

[0084] (1) Raw material preparation: Weigh 98.7 parts of purified water, 2 parts of glycerin, 0.001 parts of EDTA-disodium, 0.3 parts of polyacrylic acid, 0.5 parts of phenoxyethanol, and 1 part of squalane.

[0085] (2) Pretreatment: 98.7 parts of pure water were heated to 62°C, and glycerol, disodium EDTA, phenoxyethanol and polyacrylic acid were added in sequence. The mixture was stirred until homogeneous to obtain an aqueous premix. Squalane was heated to 55°C and stirred until homogeneous to form an oil phase mixture.

[0086] (3) Mixing and dispersing: At a speed of 200 rpm, the oil phase mixture is slowly added to the aqueous phase premix at a speed of 1 mL / min and stirred for 10 minutes to form a coarse dispersion system; then 0.2 parts of arginine are added and stirred for 5 minutes.

[0087] (4) Cooling and setting: Cool the homogenized system to room temperature at a rate of 3°C per minute, while maintaining a stirring speed of 80 rpm, so that it sets into a transparent essence product with evenly distributed oil droplets.

[0088] (5) Packaging and filling: The finished product is filled into essence bottles using aseptic filling equipment, 100ml per bottle.

[0089] (6) Quality inspection: The uniformity of oil droplet distribution was observed under a microscope. The transmittance was 98.2%, the pH value was 6.5, the viscosity was 1500 mPa·s, and the microbial indicators met the cosmetic safety standards.

[0090] Example 7

[0091] An essence in which oil droplets can be evenly distributed, the preparation method of which includes the following steps:

[0092] (1) Raw material preparation: Weigh out 60.0 parts of purified water, 10 parts of glycerin, 10 parts of propylene glycol, 10 parts of butylene glycol, 0.2 parts of sodium hyaluronate, 0.1 parts of disodium EDTA, 0.7 parts of phenoxyethanol, 6 parts of trimethylpentaphenyltrisiloxane, 2 parts of jojoba oil, 0.5 parts of polyacrylic acid, 0.5 parts of arginine, and 0.2 parts of dipotassium glycyrrhizate.

[0093] (2) Pretreatment: Heat 60.0 parts of pure water to 75°C, and add glycerol, propylene glycol, butylene glycol, sodium hyaluronate, polyacrylic acid, EDTA-disodium and phenoxyethanol in sequence. Stir evenly to obtain an aqueous premixed solution; heat trimethylpentaphenyltrisiloxane and jojoba oil to 68°C and stir evenly to form an oil phase mixture.

[0094] (3) Mixing and dispersing: At a speed of 600 rpm, the oil phase mixture is slowly added to the aqueous phase premix at a speed of 3.5 mL / min, and the mixture is stirred for 18 minutes to form a coarse dispersion system.

[0095] (4) Cooling and setting: Cool the homogenized system to room temperature at a rate of 5.5°C per minute, while maintaining a stirring speed of 95 rpm. Then add arginine and dipotassium glycyrrhizate and continue stirring for 6 minutes to set it into a transparent essence product with evenly distributed oil droplets.

[0096] (5) Packaging and filling: The finished product is filled into essence bottles using aseptic filling equipment, with each bottle containing 50ml.

[0097] (6) Quality inspection: The uniformity of oil droplet distribution was observed under a microscope. The transmittance was 91.8%, the pH value was 6.7, and the viscosity was 3900 mPa·s. The microbial indicators met the cosmetic safety standards.

[0098] Example 8

[0099] An essence in which oil droplets can be evenly distributed, the preparation method of which includes the following steps:

[0100] (1) Raw material preparation: Weigh 85.0 parts of purified water, 6 parts of glycerol, 0.3 parts of trehalose, 0.2 parts of EDTA-disodium, 0.5 parts of phenoxyethanol, 0.05 parts of ethylhexylglycerol, 5 parts of diphenyl polydimethylsiloxane, 2 parts of squalane, 0.15 parts of acrylic (ester) / C10-30 alkanol acrylate crosspolymer, 0.2 parts of arginine, and 0.6 parts of panthenol.

[0101] (2) Pretreatment: 85.0 parts of purified water were heated to 72°C, and glycerol, trehalose, acrylate / C10-30 alkanol acrylate crosspolymer, EDTA-disodium, phenoxyethanol and ethylhexylglycerol were added in sequence. The mixture was stirred until homogeneous to obtain an aqueous premix. Diphenyl polydimethylsiloxane and squalane were heated to 65°C and stirred until homogeneous to form an oil phase mixture.

[0102] (3) Mixing and dispersing: At a speed of 450 rpm, the oil phase mixture is slowly added to the aqueous phase premix at a speed of 2.5 mL / min and stirred continuously for 15 minutes to form a coarse dispersion system; then add and continue stirring for 8 minutes.

[0103] (4) Cooling and setting: Cool the homogenized system to room temperature at a rate of 4.5°C per minute, while maintaining a stirring speed of 90 rpm. Then add arginine and panthenol, and continue stirring for 5 minutes to set it into a transparent essence product with evenly distributed oil droplets.

[0104] (5) Packaging and filling: The finished product is filled into essence bottles using aseptic filling equipment, with each bottle containing 75ml.

[0105] (6) Quality inspection: The uniformity of oil droplet distribution was observed under a microscope. The transmittance was 94.5%, the pH value was 6.4, and the viscosity was 3300 mPa·s. The microbial indicators met the cosmetic safety standards.

[0106] Example 9

[0107] An essence in which oil droplets can be evenly distributed, the preparation method of which includes the following steps:

[0108] (1) Raw material preparation: Weigh out 79.2 parts of purified water, 7 parts of propylene glycol, 0.2 parts of Tremella polysaccharide, 0.1 parts of EDTA-tetrasodium, 0.5 parts of acrylic (ester) / C10-30 alkanol acrylate crosspolymer, 0.6 parts of phenoxyethanol, 4 parts of diphenyl polydimethylsiloxane, 5 parts of soybean oil, 0.5 parts of tocopheryl acetate, 0.5 parts of arginine, 0.4 parts of betaine, and 2 parts of panthenol.

[0109] (2) Pretreatment: 79.2 parts of pure water were heated to 70°C, and propylene glycol, tremella polysaccharide, EDTA-tetrasodium, phenoxyethanol, and acrylate / C10-30 alkanol acrylate cross-linked polymer were added in sequence. The mixture was stirred until homogeneous to obtain an aqueous premix. Diphenyl polydimethylsiloxane, soybean oil, and tocopheryl acetate were heated to 64°C and stirred until homogeneous to form an oil phase mixture.

[0110] (3) Mixing and dispersing: At a speed of 550 rpm, the oil phase mixture is slowly added to the aqueous phase premix at a speed of 3 mL / min, and the mixture is stirred for 20 minutes to form a coarse dispersion system;

[0111] (4) Cooling and setting: Cool the homogenized system to room temperature at a rate of 5°C per minute, while maintaining a stirring speed of 100 rpm. Then add arginine, betaine and panthenol, and continue stirring for 6 minutes to set it into a transparent essence product with evenly distributed oil droplets.

[0112] (5) Packaging and filling: The finished product is filled into essence bottles using aseptic filling equipment, with each bottle containing 50ml.

[0113] (6) Quality inspection: The uniformity of oil droplet distribution was observed under a microscope. The transmittance was 92.0%, the pH value was 6.5, and the viscosity was 4500 mPa·s. The microbial indicators met the cosmetic safety standards.

[0114] Example 10

[0115] An essence in which oil droplets can be evenly distributed, the preparation method of which includes the following steps:

[0116] (1) Raw material preparation: Weigh out 81.82 parts of purified water, 5 parts of glycerin, 0.2 parts of sodium hyaluronate, 0.08 parts of disodium EDTA, 1.5 parts of phenoxyethanol, 0.5 parts of ethylhexylglycerin, 3 parts of corn oil, 5 parts of diphenylpolydimethylsiloxane, 0.2 parts of polyacrylic acid, 0.2 parts of arginine, 0.5 parts of sugar isomers, and 2 parts of dipotassium glycyrrhizate.

[0117] (2) Pretreatment: 81.82 parts of pure water were heated to 68°C, and glycerol, sodium hyaluronate, disodium EDTA, phenoxyethanol, ethylhexylglycerin and polyacrylic acid were added in sequence. The mixture was stirred until homogeneous to obtain an aqueous premix. Corn oil and diphenyl polydimethylsiloxane were heated to 62°C and stirred until homogeneous to form an oil phase mixture.

[0118] (3) Mixing and dispersing: At a speed of 400 rpm, the oil phase mixture is slowly added to the aqueous phase premix at a speed of 2 mL / min, and the mixture is stirred for 15 minutes to form a coarse dispersion system.

[0119] (4) Cooling and setting: Cool the homogenized system to room temperature at a rate of 4°C per minute, while maintaining a stirring speed of 90 rpm. Then add arginine, sugar isomers and dipotassium glycyrrhizate, and continue stirring for 5 minutes to set it into a transparent essence product with evenly distributed oil droplets.

[0120] (5) Packaging and filling: The finished product is filled into essence bottles using aseptic filling equipment, 100ml per bottle.

[0121] (6) Quality inspection: The uniformity of oil droplet distribution was observed under a microscope. The transmittance was 93.7%, the pH value was 6.6, and the viscosity was 3600 mPa·s. The microbial indicators met the cosmetic safety standards.

[0122] Example 11

[0123] An essence in which oil droplets can be evenly distributed, the preparation method of which includes the following steps:

[0124] (1) Raw material preparation: Weigh out 70.0 parts of purified water, 8 parts of propylene glycol, 3 parts of butylene glycol, 0.4 parts of trehalose, 0.1 parts of EDTA-tetrasodium, 0.6 parts of phenoxyethanol-ethylhexylglycerin compound, 8 parts of diphenylpolydimethylsiloxane, 4 parts of trimethylpentaphenyltrisiloxane, 2 parts of squalane, 1 part of vitamin E, 0.3 parts of polyacrylic acid, 0.1 parts of chondrus crispus extract, 0.2 parts of arginine, 0.5 parts of panthenol, and 0.8 parts of dipotassium glycyrrhizate.

[0125] (2) Pretreatment: 70.0 parts of purified water were heated to 76°C, and propylene glycol, butylene glycol, trehalose, EDTA-tetrasodium, phenoxyethanol-ethylhexylglycerin complex, polyacrylic acid and chondrus crispus extract were added in sequence. The mixture was stirred and homogenized to obtain an aqueous premix. Diphenylpolydimethylsiloxane, trimethylpentaphenyltrisiloxane, squalane and vitamin E were heated to 69°C and stirred and mixed evenly to form an oil phase mixture.

[0126] (3) Mixing and dispersing: At a speed of 700 rpm, the oil phase mixture is slowly added to the aqueous phase premix at a speed of 4 mL / min, and the mixture is stirred for 22 minutes to form a coarse dispersion system.

[0127] (4) Cooling and setting: Cool the homogenized system to room temperature at a rate of 6°C per minute, while maintaining a stirring speed of 110 rpm. Then add arginine, panthenol and dipotassium glycyrrhizate, and continue stirring for 7 minutes to set it into a transparent essence product with evenly distributed oil droplets.

[0128] (5) Packaging and filling: The finished product is filled into essence bottles using aseptic filling equipment, with each bottle containing 50ml.

[0129] (6) Quality inspection: The uniformity of oil droplet distribution was observed under a microscope. The transmittance was 93.0%, the pH value was 6.8, the viscosity was 4000 mPa·s, and the microbial indicators met the cosmetic safety standards.

[0130] To verify the technical effects of the present invention, the following comparative examples were designed:

[0131] Comparative Example 1

[0132] This comparative example, compared to the formulation of Example 1, does not contain sodium hyaluronate, and its preparation method includes the following steps:

[0133] (1) Raw material preparation: Weigh out 80.25 parts of purified water, 7 parts of glycerin, 0.1 parts of EDTA-disodium, 0.05 parts of ethylhexylglycerin, 0.5 parts of phenoxyethanol, 8 parts of diphenylpolydimethylsiloxane, 3 parts of squalane, 0.3 parts of vitamin E, 0.2 parts of polyacrylic acid, 0.2 parts of sugar isomers, 0.2 parts of dipotassium glycyrrhizate and 0.2 parts of arginine.

[0134] (2) The pretreatment, mixing and dispersion, cooling and shaping and packaging and filling steps are the same as in Example 1.

[0135] Comparative Example 2

[0136] This comparative example, compared to the formulation of Example 2, does not contain trehalose, and its preparation method includes the following steps:

[0137] (1) Raw material preparation: Weigh out 77.02 parts of purified water, 8 parts of propylene glycol, 0.15 parts of EDTA-tetrasodium, 0.15 parts of calcium chloride, 0.6 parts of phenoxyethanol-ethylhexylglycerin compound, 7 parts of trimethylpentaphenyltrisiloxane, 5 parts of soybean oil, 0.4 parts of vitamin C, 0.08 parts of gellan gum, 0.1 parts of caramel color, 1 part of panthenol and 0.5 parts of xylitol.

[0138] (2) The pretreatment, mixing and dispersion, cooling and shaping and packaging and filling steps are the same as in Example 2.

[0139] Comparative Example 3

[0140] Compared with the formulation of Example 3, this comparative example does not contain Tremella polysaccharide, and its preparation method includes the following steps:

[0141] (1) Raw material preparation: Weigh out 78.55 parts of purified water, 11 parts of butanediol, 0.05 parts of EDTA-tetrasodium, 0.8 parts of betaine, 0.6 parts of methylparaben, 2 parts of corn oil, 5 parts of diphenyl polydimethylsiloxane, 0.4 parts of tocopheryl acetate, 0.2 parts of acrylic (ester) / C10-30 alkanol acrylate crosspolymer, 0.2 parts of arginine, 0.2 parts of sugar isomers and 1 part of panthenol.

[0142] (2) The pretreatment, mixing and dispersion, cooling and shaping and packaging and filling steps are the same as in Example 3.

[0143] Comparative Example 4

[0144] Compared with the formulation of Example 1, this comparative example added 1.0 part of sodium dodecyl sulfate (SDS) as an emulsifier, and correspondingly reduced the amount of purified water used. Its preparation method includes the following steps:

[0145] (1) Raw material preparation: Weigh out 79.05 parts of purified water, 7 parts of glycerin, 0.2 parts of sodium hyaluronate, 0.1 parts of disodium EDTA, 0.05 parts of ethylhexylglycerin, 0.5 parts of phenoxyethanol, 8 parts of diphenyl polydimethylsiloxane, 3 parts of squalane, 0.3 parts of vitamin E, 0.2 parts of polyacrylic acid, 0.2 parts of sugar isomers, 0.2 parts of dipotassium glycyrrhizate, 0.2 parts of arginine and 1.0 part of sodium dodecyl sulfate.

[0146] (2) Pretreatment: 79.05 parts of purified water were heated to 70°C, and glycerol, sodium hyaluronate, disodium EDTA, ethylhexylglycerin, phenoxyethanol and sodium dodecyl sulfate were added in sequence and stirred evenly to obtain an aqueous premix; diphenyl polydimethylsiloxane, squalane and vitamin E were heated to 65°C and stirred evenly to form an oil phase mixture.

[0147] (3) The mixing, dispersing, cooling, shaping and packaging steps are the same as in Example 1.

[0148] Comparative Example 5

[0149] Compared with the formulation of Example 5, the cooling rate of this comparative example was adjusted to 1°C per minute, the stirring speed was adjusted to 50 rpm, and the remaining steps were the same.

[0150] To comprehensively evaluate the technical effects of the present invention, the following tests were conducted:

[0151] Experiment 1: Moisturizing Efficacy Test

[0152] Skin moisture was measured in 20 female subjects with dry or combination skin using a skin moisture meter (CM825 model manufactured by Courage & Khazaka, Germany). The test environment was a constant temperature and humidity room with a temperature of 21°C and a relative humidity of 51%. The test procedure was as follows: First, the skin on the inner forearm of the subjects was cleaned. Two hours later, the test product (Examples 1-11 and Comparative Examples 1-5) was applied. Skin moisture was measured at 0.5 hours, 2 hours, 8 hours, and 24 hours after application. The average results expressed as a percentage are listed in Table 1.

[0153] Table 1. Results of Moisturizing Efficacy Test (%)

[0154] Test sample 0.5 hours 2 hours 8 hours 24 hours Example 1 63 50 30 18 Example 2 65 48 32 20 Example 3 68 45 35 23 Example 4 60 46 28 17 Example 5 70 52 36 25 Example 6 45 35 20 12 Example 7 72 55 38 26 Example 8 62 47 30 19 Example 9 65 49 33 21 Example 10 66 50 32 20 Example 11 69 53 35 24 Comparative Example 1 35 26 16 7 Comparative Example 2 33 24 14 5 Comparative Example 3 38 28 19 11 Comparative Example 4 58 40 25 15 Comparative Example 5 42 30 18 10

[0155] As can be seen from the test results in Table 1, the moisturizing effects of Examples 1-11 at all time points were significantly better than those of Comparative Examples 1-5. Especially after 24 hours, the moisturizing effect of the Examples (12-26%) was much higher than that of the Comparative Examples (5-15%). This fully demonstrates the significant advantages of the multi-moisturizing system of the present invention (especially polysaccharide moisturizing factors such as sodium hyaluronate, trehalose, and tremella polysaccharide) in long-lasting moisturizing. Among them, Example 7 showed the best moisturizing effect, possibly related to its high concentration (30%) of moisturizing factors; Example 6 had a relatively weaker moisturizing effect, but was still better than the Comparative Examples, possibly because it contained only the lowest concentration of moisturizing factors (2%) and oil phase components (1%). Furthermore, although Comparative Example 4 added an emulsifier, its moisturizing effect was still inferior to that of the Examples, indicating that the emulsifier-free system of the present invention not only avoids the potential irritation caused by emulsifiers but also provides better moisturizing effects.

[0156] Experiment 2: Soothing Efficacy Test (Hyaluronase Inhibition Rate)

[0157] Hyaluronidase is a specific enzyme that cleaves hyaluronic acid and is involved in allergic reactions, showing a strong correlation with histamine release from mast cells. The soothing efficacy can be assessed by measuring the inhibition rate of hyaluronidase in test samples; a higher inhibition rate indicates a stronger soothing effect.

[0158] The test (HMC-WI-029 hyaluronidase inhibition rate) was performed using a laboratory method, employing a BSA224S analytical balance and an L6s UV spectrophotometer. The test procedures are briefly described below:

[0159] (1) Treatment of control and test samples: The sample group is the original sample; the positive control is 3% dipotassium glycyrrhizate aqueous solution; the negative control is pure water.

[0160] (2) Experimental procedure: Set up sample group, sample background group, solvent group and solvent background group, and set up 3 parallel samples in each group. Add different reagent solutions to each sample, shake well, let stand at room temperature for 30 minutes to develop color, and use ultraviolet spectrophotometer to measure the absorbance value at a wavelength of 528nm.

[0161] (3) Calculation formula: Hyaluronidase inhibition rate (%) = (1 - (AB) / (CD)) × 100

[0162] In the formula: A is the absorbance of the reaction solution without the sample; B is the absorbance of the reaction solution without the sample and enzyme; C is the absorbance of the reaction solution containing the sample and enzyme; D is the absorbance of the reaction solution containing the sample and without the enzyme.

[0163] (4) Data analysis: SPSS statistical analysis software was used to compare the differences in hyaluronidase inhibition rates among the test samples, positive control and negative control using independent samples t test, with a significance level of α = 0.05.

[0164] Table 2. Results of the soothing efficacy test (hyaluronidase inhibition rate %)

[0165]

[0166]

[0167] Test results showed that the positive control (3% dipotassium glycyrrhizate aqueous solution) exhibited a hyaluronidase inhibition rate >50%, proving the effectiveness of the reaction system. Examples 1, 5, 7, 10, and 11 all showed hyaluronidase inhibition rates exceeding 50%, with Example 10 showing the highest inhibition rate at 58.92%, possibly related to its 2% dipotassium glycyrrhizate content. Examples 2-4, 6, and 8-9 showed inhibition rates between 25-49%, while comparative examples 1-3 and 5 showed inhibition rates of only approximately 12-22%. All test samples showed significant differences compared to the negative control (P<0.05), indicating that the product of this invention has a significant soothing effect and is significantly superior to the comparative examples lacking specific polysaccharide moisturizing factors.

[0168] It is worth noting that although Comparative Example 4 contained an emulsifier, its soothing effect was significantly better than that of Comparative Examples 1-3 and Comparative Example 5, but still inferior to Examples 1, 5, 7, 10, and 11. This demonstrates that the emulsifier-free system of the present invention can not only provide good moisturizing effects but also achieve excellent soothing functions.

[0169] Experiment 3: Stability Test

[0170] To assess the long-term stability of the products, samples from Examples 1-11 and Comparative Examples 1-5 were stored at 4°C, 25°C, and 45°C for 3 months, respectively, and changes in product appearance, oil droplet distribution, transparency, and other indicators were observed periodically.

[0171] Table 3. Stability test results (after 3 months)

[0172]

[0173]

[0174] Test results showed that Examples 1-11 remained stable during 3 months of storage at 4°C and 25°C, with no significant changes. At 45°C, except for Examples 4 and 9, the other examples showed slight oil droplet aggregation or decreased transparency, but overall remained transparent and maintained dispersion stability. Examples 4 and 9 remained completely stable even at 45°C, which may be related to their lower concentration of oil phase components.

[0175] In contrast, Comparative Examples 1-3 and 5 exhibited significant oil droplet aggregation and even stratification at both 25°C and 45°C, demonstrating significantly inferior stability compared to the Examples. Comparative Example 4, despite the addition of an emulsifier, remained stable at 25°C, but its transparency decreased and it became cloudy at 45°C. This clearly demonstrates the advantages of the formulation design and preparation process of this invention in maintaining product stability.

[0176] The above test results fully demonstrate that this invention, through special formula design and precise process control, successfully achieves a transparent essence with uniformly distributed oil droplets without the use of emulsifiers, exhibiting excellent moisturizing and soothing effects and good stability. In particular, polysaccharide moisturizing factors (such as sodium hyaluronate, trehalose, and tremella polysaccharide) not only provide long-lasting moisturizing effects in this invention but also significantly contribute to the product's stability and soothing efficacy. Furthermore, precise control of process parameters (such as cooling rate and stirring speed) also has a significant impact on product quality, as evidenced by the test results of Comparative Example 5.

[0177] In summary, the transparent moisturizing and soothing essence with uniformly distributed oil droplets and its preparation process provided by this invention successfully solve the problems in the prior art and have broad application prospects and market value.

[0178] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An essence in which oil droplets can be evenly distributed, characterized in that, The essence comprises an aqueous phase and an oil phase, wherein: an essence in which oil droplets can be uniformly distributed and its preparation process are described. The aqueous phase composition includes 50-99 parts by weight of purified water, 2-30 parts by weight of moisturizing factor, 0.001-0.2 parts by weight of chelating agent, 0.001-5 parts by weight of thickener, and 0.5-2 parts by weight of preservative. The oil phase component includes 1-15 parts by weight of oily components; The essence is transparent, with oil droplets evenly distributed and no emulsifiers added.

2. The transparent moisturizing and soothing essence with uniformly distributed oil droplets according to claim 1, characterized in that, The moisturizing factor is selected from polyols, polysaccharides, and their combinations. The polyols include at least one of glycerin, propylene glycol, and butylene glycol, and the polysaccharides include at least one of sodium hyaluronate, trehalose, and tremella polysaccharide.

3. The transparent moisturizing and soothing essence with uniformly distributed oil droplets according to claim 1, characterized in that, The chelating agent is selected from at least one of EDTA-disodium and EDTA-tetrasodium; the thickener is selected from at least one of polyacrylic acid, gellan gum, acrylate / C10-30 alkanol acrylate crosspolymer, chondrus crispus extract, and sodium polyacrylate; the preservative is selected from at least one of phenoxyethanol, ethylhexylglycerin, parabens, p-hydroxyacetophenone, 1,2-hexanediol, and 1,2-pentanediol, or a combination thereof.

4. The transparent moisturizing and soothing essence with uniformly distributed oil droplets according to claim 1, characterized in that, The oil phase component is selected from at least one of natural oils, silicone oils, and synthetic oils. The natural oils include at least one of squalane, jojoba oil, soybean oil, and corn oil. The silicone oils include at least one of diphenylpolydimethylsiloxane and trimethylpentaphenyltrisiloxane. The synthetic oils include tocopherol derivatives, dipropylene glycol dibenzoate, and caprylic / capric / succinic acid triglycerides.

5. The transparent moisturizing and soothing essence with uniformly distributed oil droplets according to claim 1, characterized in that, The essence also contains 0.1-5 parts by weight of an active ingredient, which is selected from at least one or a combination of dipotassium glycyrrhizate, panthenol, vitamin C, sugar isomers, and betaine.

6. A method for preparing the transparent moisturizing and soothing essence with uniformly distributed oil droplets as described in any one of claims 1-5, characterized in that, Includes the following steps: A. Raw material preparation: Weigh the aqueous and oil phase raw materials according to the proportions; B. Pretreatment: Heat the purified water to 60-80℃, add the chelating agent, moisturizing factor, thickener and preservative in sequence, stir until homogeneous, and obtain an aqueous premix; heat the oil phase raw materials to 55-75℃, stir and mix until homogeneous, and obtain an oil phase mixture. C. Mixing and dispersing: At a speed of 200-1000 rpm, slowly add the oil phase mixture to the aqueous phase premix and stir continuously for 10-30 minutes to form a coarse dispersion system; D. Cooling and setting: Cool the system to room temperature at a rate of 3-7°C per minute, while maintaining a stirring speed of 80-120 rpm. E. Packaging and filling: The finished product is filled into containers using aseptic filling equipment.

7. The method according to claim 6, characterized in that, In step B, the thickener is added to the aqueous premix.

8. The method according to claim 6, characterized in that, In step B, the temperature of the aqueous premix is ​​3-10°C higher than the temperature of the oil mixture.

9. The method according to claim 6, characterized in that, In step C, the oil phase mixture is slowly added to the aqueous phase premix at a rate of 1-5 mL / min.

10. The method according to claim 6, characterized in that, The method further includes step F: quality inspection, the inspection items include oil droplet distribution uniformity, transparency, pH value, viscosity and microbial indicators. The oil droplet distribution uniformity is judged by microscopic observation, and the transparency is determined by light transmittance measurement. The qualified standard is light transmittance ≥90%.

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