Skin care composition containing paraguay tea leaf extract and preparation method thereof

Abstract

The invention belongs to the field of daily chemicals, and particularly relates to a skin care composition containing a paraguay tea leaf extract and a preparation method thereof, the skin care composition comprises the following components by weight: 1-4% of paraguay tea leaf extract; 0.1 to 5.0 percent of red algae extract; 0.1 to 3 percent of urea; 0.01%-0.1% of a chelating agent; 0.01%-1% of a thickening agent; 1-10% of an emulsifier; 1-20% of grease; 0.5 to 10 percent of polyhydric alcohol; 0.5-2% of a preservative; 0.01-1% of sodium hydroxide; 0.01 to 0.1 percent of essence; and the balance pure water. Through mutual cooperation and synergistic interaction of the paraguay tea leaf extract, the red algae extract and the urea, the anti-inflammatory and soothing effects can be achieved, meanwhile, the barrier function of cuticle is enhanced, skin redness, pruritus and other inflammations are effectively relieved, and the skin is helped to recover the stable state.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of daily chemicals, and particularly relates to a skin care composition containing Paraguay tea leaf extract and a preparation method thereof. BACKGROUND

[0002] The incidence of skin inflammation such as eczema, seborrheic dermatitis, rosacea, contact dermatitis and the like has significantly increased in modern society, which is closely related to multiple factors such as environmental changes, lifestyle, skin care habits, stress and the like. First, long-term exposure to a polluted environment can increase the incidence of dermatitis. Fine particulate matter, ozone, nitrogen oxides and the like contained in air, automobile exhaust, industrial waste gas and the like can adhere to the skin surface, causing oxidative stress and damaging the skin barrier function. Second, high temperature and humidity in summer easily lead to sweat retention, causing adverse symptoms such as miliaria, intertrigo dermatitis and the like. In addition, excessive sun exposure outdoors can damage the stratum corneum and induce the release of inflammatory factors (such as IL-6, TNF-α), aggravating photosensitive dermatitis or rosacea.

[0003] Therefore, in order to alleviate the adverse symptoms of the skin, consumers will pay more attention to the skin care effect of the product when selecting skin care products. However, some skin care products contain high concentrations of acids, alcohol, methyl isothiazolinone, formaldehyde releasers and the like, which can easily damage the protective layer on the surface of the skin, thin the stratum corneum, cause damage to the skin barrier, cause inflammatory symptoms such as redness, burning, erythema, papules and the like on the skin, and have adverse effects on the skin and human health. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a skin care composition containing Paraguay tea leaf extract and a preparation method thereof. The skin care composition containing Paraguay tea leaf extract and a preparation method thereof can synergistically enhance the barrier function of the stratum corneum while relieving inflammation, effectively relieve inflammation such as skin redness and itching, and help the skin to restore to a stable state.

[0005] The technical scheme adopted by the present application to solve the above problems is as follows: A skin care composition containing Paraguay tea leaf extract comprises the following components in percentage by weight: Paraguay tea leaf extract 1-4%; red algae extract 0.1-5.0%; urea 0.1-3%; chelating agent 0.01-0.1%; thickening agent 0.01-1%; emulsifier 1-10%; oil 1-20%; polyhydric alcohol 0.5-10%; preservative 0.5-2%; sodium hydroxide 0.01-1%; fragrance 0.01-0.1%; and the balance is pure water.

[0006] The Paraguay tea leaves are rich in antioxidant components such as polyphenols and flavonoids, can resist free radicals, reduce skin oxidative damage, prevent wrinkles, slackening and other signs of aging, make the skin more firm and elastic, and the effective components contained in the Paraguay tea leaves have the effects of soothing and anti-inflammatory, and can improve the discomfort symptoms such as skin redness and itching. The chlorogenic acid and caffeic acid in the Paraguay tea leaf extract can inhibit the activation of nuclear factor kappa B (NF-κB), reduce the transcription of pro-inflammatory cytokines such as TNF-α, IL-6 and IL-1β, thereby reducing the incidence of inflammation. At the same time, the polyphenols in the Paraguay tea leaf extract can inhibit the phosphorylation of p38MAPK and JNK kinase, block the inflammatory cascade reaction, and further reduce the risk of inflammation. Urea has the effects of moisturizing and softening keratin, can prevent the keratin layer from blocking the pores, and improve the problem of acne. As a moisture absorber, urea can absorb moisture from the environment and retain it on the skin surface, reduce water loss, effectively improve the problems of dry and rough skin, and enhance the barrier function of the skin. The moisturizing ingredients of the red algae extract are mainly derived from deep-sea red algae. After the active ingredients such as polysaccharides, amino acids, vitamins and minerals are extracted from the red algae, they are compounded with sugar (such as glucose, fructose, trehalose, etc.) or glycoside ingredients to form a natural and efficient skin care ingredient. The red algae extract applied in cosmetics such as cream, essence and emulsion can enhance the moisturizing effect and skin repair ability of the product.

[0007] Further, the preparation method of the Paraguay tea leaf extract comprises the following steps: S1. The Paraguay tea leaves are removed of impurities, dried at 75-80℃ for 1.5-2h, and then ultra-finely pulverized and sieved through a 100-200 mesh sieve to obtain Paraguay tea leaf powder; S2. The Paraguay tea leaf powder is mixed with pure water, 1g of the Paraguay tea leaf powder corresponds to 10-30mL of pure water, and then heated and refluxed for extraction. The refluxing temperature is 75-80℃, and the time is 55-65min. After extraction, the crude extract is sieved through a 100-200 mesh filter cloth to obtain a crude extract; S3. The crude extract is mixed with ethyl acetate for extraction, and the volume ratio of the crude extract to ethyl acetate is 9:1. After extraction, the pressure is reduced and distilled at 60-70℃ for 20-30min to obtain the Paraguay tea leaf extract.

[0008] Furthermore, the thickener includes at least one of natural thickeners, semi-synthetic thickeners, and synthetic thickeners; the natural thickener includes at least one of guar gum and xanthan gum; the semi-synthetic thickener includes at least one of hydroxypropyl methylcellulose and sodium carboxymethyl starch; and the synthetic thickener includes at least one of sodium polyacrylate and carbomer.

[0009] The above technical solutions can increase the viscosity of the system, transforming liquid products into semi-solid or gel-like forms, thus improving the product's spreadability and skin feel. In emulsions and suspensions, thickeners can delay particle settling or oil-water separation, enhancing the stability of the dispersion system and thereby improving the uniformity of the distribution of the active ingredients in the composition of this invention within the system.

[0010] Furthermore, the emulsifier includes at least one of natural emulsifiers and synthetic emulsifiers; the natural emulsifier includes at least one of lecithin and gum arabic; the synthetic emulsifier includes at least one of sodium stearate, PEG-100 stearate, and glyceryl stearate.

[0011] The above technical solution can stabilize the oil-water immiscible system, reduce the interfacial tension to make the oil phase and water phase mix evenly, form a stable system, and improve the stability of the composition system of the present invention.

[0012] Furthermore, the oil includes at least one of vegetable oil, animal oil, mineral oil, and synthetic oil.

[0013] Furthermore, the vegetable oil includes at least one of sunflower seed oil, almond oil, and palm oil; the animal oil includes at least one of beeswax, horse oil, and lanolin; the mineral oil includes at least one of white oil, petrolatum, and paraffin; and the synthetic oil includes at least one of isopropyl myristate, caprylic / capric triglyceride, and polydimethylsiloxane.

[0014] Through the above technical solutions, oils can give the composition of the present invention good moisturizing and hydrating properties, while also improving the texture and feel of the composition, making it easier to apply and spread. Among them, vegetable oils are rich in unsaturated fatty acids and vitamins, and have good moisturizing and hydrating effects; animal oils contain more saturated fatty acids and have strong stability; mineral oils have good chemical stability; and synthetic oils have even better stability and durability.

[0015] Furthermore, the polyol includes at least one of glycerol, propylene glycol, 1,3-butanediol, and sorbitol.

[0016] Through the above technical solutions, polyols contain two or more hydroxyl groups, have good hydrophilicity, are easily soluble in water and organic solvents, and have functions such as moisturizing, dissolving, and regulating the skin.

[0017] Furthermore, the chelating agent is EDTA-2Na.

[0018] Through the above technical solutions, chelating agents can combine with metal ions to form stable complexes, which can increase the stability, efficacy and safety of the compositions of the present invention.

[0019] Furthermore, the preservative includes at least one of phenoxyethanol, chlorophenoxyethanol, and 1,2-hexanediol.

[0020] Through the above technical solutions, the preservative can ensure the safety and stability of the composition of the present invention, inhibit the growth and reproduction of microorganisms, prevent product spoilage and deterioration, and reduce the risk of skin irritation, allergies and other problems caused by microbial contamination.

[0021] A method for preparing a skincare composition containing Paraguayan tea extract includes the following steps: A1. Mix the emulsifier and oil, and heat in a water bath at 78±2℃ for 20-40 minutes to obtain the oil phase; A2. Mix polyol, thickener, chelating agent and hot pure water at 85-90℃. The total mass ratio of polyol, thickener and chelating agent to hot pure water is 6:(50-60). After keeping in a water bath at 85-90℃ for 15-20 minutes, homogenize until there are no obvious particles in the mixture to obtain the aqueous phase. A3. Mix the aqueous phase and oil phase until homogenized and free of particles. Cool to 60-65°C while stirring at 3000-4000 rpm. Add sodium hydroxide to adjust the pH to 5.5-6.5. Cool to 50-55°C. Then add preservative, Paraguayan tea extract, red algae extract, and flavoring in sequence. Stir well and add pure water. Stir until 30-35°C and discharge to obtain the finished product.

[0022] The present invention has the following beneficial effects: 1. This invention combines Paraguayan tea extract, red algae extract, and urea to achieve synergistic effects, thereby enhancing the barrier function of the stratum corneum while reducing inflammation and soothing the skin. This effectively relieves skin redness, itching, and other inflammations, helping the skin to return to a stable state.

[0023] 2. This invention employs ultrafine pulverization, reflux extraction, and vacuum distillation to extract Paraguayan tea leaves, significantly shortening extraction time, improving extraction efficiency, and yielding a high-purity extract. Ultrafine pulverization greatly increases the surface area of ​​the material, enhancing the chemical reaction or dissolution rate and allowing for more complete release of active ingredients. Reflux extraction improves extraction efficiency, and the solvent can be reused, reducing consumption. The low-temperature operation of vacuum distillation not only reduces the heating cost of high-boiling-point substances but also protects heat-sensitive components, enhancing the effectiveness of the composition. This invention, through pulverization-solubilization-high-efficiency extraction-low-temperature separation, improves extraction efficiency, shortens the cycle, reduces energy consumption, and preserves the active ingredients more completely. Detailed Implementation

[0024] To make the technical problems, solutions, and advantages of this invention clearer, a detailed description will be provided below with reference to specific examples. However, the scope of protection of this invention is not limited to the following specific embodiments. The described embodiments are merely some, not all, of the embodiments of this invention, and are not intended to limit the invention. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0025] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.

[0026] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0027] In the quantitative experiments in the following examples, three replicate experiments were set up, and the data are the average of the three replicate experiments or the average ± standard deviation.

[0028] The skin care composition containing Paraguayan tea extract of the present invention includes Examples 1 to 4 and Comparative Examples 1 to 7. The specific components and contents are shown in Table 1, in units of weight percentage.

[0029] Table 1

[0030] Specifically, the preparation method of the Paraguayan tea extract in the above embodiments and comparative examples includes the following steps: S1. Remove impurities from Paraguayan tea leaves, dry them at 78°C for 2 hours, then pulverize the dried Paraguayan tea leaves into ultrafine powder and pass them through a 100-mesh sieve to obtain Paraguayan tea powder. S2. Mix Paraguayan tea powder with water, with 1g of Paraguayan tea powder corresponding to 20mL of water. After mixing, heat and reflux extraction at 78℃ for 60min. After extraction, filter through a 200-mesh filter cloth to obtain crude extract. S3. The crude extract was mixed with ethyl acetate and extracted. The volume ratio of crude extract to ethyl acetate was 9:1. After extraction, vacuum distillation was performed at a pressure of 20 kPa, a temperature of 65°C, and a time of 25 min to obtain Paraguayan tea extract.

[0031] Specifically, the method for preparing the skincare composition of the embodiment includes the following steps: A1. Mix the emulsifier and oil, and heat in a water bath at 80°C for 30 minutes to obtain the oil phase; A2. Mix polyol, thickener, chelating agent and hot pure water at 85°C. The total mass ratio of polyol, thickener and chelating agent to hot pure water is 6:55. After heating in a water bath at 85°C for 20 minutes, homogenize until there are no particles to obtain the aqueous phase. A3. Mix the aqueous phase and oil phase until homogenized and free of particles. Cool to 60°C while stirring at 3800 rpm. Add sodium hydroxide to adjust the pH to 5.5-6.5. Cool to 50°C. Then add preservative, Paraguayan tea extract, red algae extract, and flavoring in sequence. Stir well and add pure water. Stir until 35°C and discharge to obtain the finished product.

[0032] Testing and inspection: The above 11 skin care compositions were evaluated using instruments. 352 volunteers with sensitive skin and acne-prone skin were randomly selected and divided into 11 groups. Each group corresponded to any one of the embodiments or comparative examples. The efficacy was tested by measuring the change rate of transepidermal water loss, the change rate of skin a* value, the change value of skin hemoglobin, the percentage of effective moisturizing effect score of consumers, and the percentage of effective anti-inflammatory and soothing score of consumers. The specific test results are shown in Table 2.

[0033] 1. Change rate of transepidermal water loss Testing instrument: Delfin VaPoMeter (Skin transepidermal moisture loss meter) Test environment: Temperature: 21.0±1.0℃; Humidity: 50%±10%RH Test principle: Transepidermal water loss is calculated based on Fick's law of diffusion, which measures the partial pressure gradient of water vapor at different points per unit time and unit cross-sectional area. A decrease in the value indicates a slower rate of skin moisture evaporation and improved skin barrier function.

[0034] Test Method: No products (cosmetics or topical medications) should be used on the test site for 3 days prior to the test, and the site should not come into contact with water for 3 hours. Before the test, the subjects need to clean their arms uniformly by wiping them clean with a dry tissue. Determine the test area for the subject. Prepare 200 μL ± 10 μL of sodium dodecyl sulfate solution (1.0 g of sodium dodecyl sulfate dissolved in 99.0 g of pure water to prepare a 1% sodium dodecyl sulfate solution), inject it into the small chamber of the spot tester, soak filter paper in it, and apply it to the flexor side of the subject's left and right forearms, one on each side. Gently press with the palm of your hand to ensure even application to the skin, and continue for 24 hours. Thirty minutes after removing the patch, the subject sat quietly for at least 10 minutes in a laboratory with a temperature of 21±1℃ and a relative humidity of 50%±10%, without drinking water or beverages, with the forearm exposed in a test position and kept relaxed. Data after patch removal was recorded as day 0 using a skin transepidermal moisture meter (Delfin VaPoMeter). An appropriate amount of sample was applied to the sample area and massaged until absorbed, at least twice a day. Data was collected and recorded as day 3 after 3 days of sample use using a skin transepidermal moisture meter (Delfin VaPoMeter).

[0035] Data statistics: The data was processed using data processing software. The rate of change before and after the data was calculated as: [(mean after sampling - mean before sampling) / mean before sampling] * 100%.

[0036] 2. Skin a* value change rate Testing instrument: Multifunctional 3D Skin Imaging Analyzer (Antera 3D®HC1023Q) Test environment: Temperature: 20~22℃; Relative humidity: 40~60% Test principle: Spatial and spectral analysis is performed using 24 LEDs at 7 different wavelengths to derive quantifiable parameters. A decrease in the a* value indicates an improvement in skin redness.

[0037] Test Method: No products (cosmetics or topical medications) should be used on the test site for 3 days prior to the test. Before the test, subjects must clean the inside of their forearms with a dry tissue. The test area should be marked on the inside of both forearms, with an area of ​​3*3 cm. Apply transparent tape to the test area and press for 10 seconds, then peel it off 10 times with the same force and technique until the skin turns red. The sample area should be treated with (2.0±0.1) mg / cm². 2 For the test sample, gently massage until fully absorbed. After 1 hour, image acquisition is performed on the sample area.

[0038] Data statistics: Rate of change before and after sampling: [(Mean after sampling - Mean before sampling) / Mean before sampling] * 100% 3. Changes in skin hemoglobin levels Testing instrument: Skin color testing probe (Delfin SkinColorCatch) Test environment: Temperature: 21.0±1.0℃; Humidity: 50%±10%RH Test principle: Based on the principle of light reflection, a quantified hemoglobin value is obtained. A decrease in the value indicates that the skin has been soothed.

[0039] Test Method: No products (cosmetics or topical medications) should be used on the test site for 3 days prior to the test, and the site should not come into contact with water for 3 hours. Before the test, the subjects need to clean their arms uniformly by wiping them clean with a dry tissue. Determine the test area for the subject. Prepare 200 μL ± 10 μL of sodium dodecyl sulfate solution (1.0 g of sodium dodecyl sulfate dissolved in 99.0 g of pure water to prepare a 1% sodium dodecyl sulfate solution), inject it into the small chamber of the spot tester, soak filter paper in it, and apply it to the flexor side of the subject's left and right forearms, one on each side. Gently press with the palm of your hand to ensure even application to the skin, and continue for 24 hours. Thirty minutes after removing the patch, the subject sat quietly for at least 10 minutes in a laboratory with a temperature of 21±1℃ and a relative humidity of 50%±10%, without drinking water or beverages. The forearm was exposed and placed in a test position, remaining relaxed. Data after patch removal was collected and recorded using the Delfin SkinColorCatch skin color tester and recorded as day 0. An appropriate amount of sample was applied to the sample area and massaged until absorbed, twice a day. Data was collected and recorded using the Delfin SkinColorCatch skin color tester and recorded as day 5 after one week of sample use.

[0040] Data statistics: The change in skin hemoglobin value was calculated using the formula: mean value after sample use - mean value before sample use. The average of the calculation results from multiple subjects was taken for each test sample group.

[0041] 4. Percentage of consumers who rated the moisturizing effect as effective Testing method: Questionnaire Test environment: Temperature: 20~22℃; Relative humidity: 40~60% Test principle: The sample is evaluated for its moisturizing effect through consumer use tests.

[0042] Test Method: No products (cosmetics or topical medications) should be used on the test site for 3 days prior to the test, and the site should not come into contact with water for 3 hours. Before the test, the subjects need to clean their arms uniformly by wiping them clean with a dry tissue. Determine the test area for the subject. Prepare 200 μL ± 10 μL of sodium dodecyl sulfate solution (1.0 g of sodium dodecyl sulfate dissolved in 99.0 g of pure water to prepare a 1% sodium dodecyl sulfate solution), inject it into the small chamber of the spot tester, soak filter paper in it, and apply it to the flexor side of the subject's left and right forearms, one on each side. Gently press with the palm of your hand to ensure even application to the skin, and continue for 24 hours. Thirty minutes after removing the patch, subjects sat quietly for at least 10 minutes in a laboratory at a temperature of 21±1℃ and a relative humidity of 50%±10%, without drinking water or beverages. Their forearms were exposed and placed in a test position, remaining relaxed. An appropriate amount of sample was applied to the sample area and massaged until absorbed, twice daily. After one week of sample use, participants rated the effectiveness of the sample using a questionnaire (1. Satisfied, 2. Somewhat Satisfied, 3. Somewhat Dissatisfied, 4. Dissatisfied), categorized into "positive answer group" and "negative answer group" (positive answer group = 1+2, negative answer group = 3+4). The combined percentage of the "positive answer group" represents the total percentage of participants who provided a satisfactory result.

[0043] 5. Percentage of consumers rated the anti-inflammatory and soothing effects effectively. Testing method: Questionnaire Test environment: Temperature: 20~22℃; Relative humidity: 40~60% Testing principle: Consumer testing is used to evaluate whether the sample has anti-inflammatory and soothing effects.

[0044] Test Method: No products (cosmetics or topical medications) should be used on the test site for 3 days prior to the test, and the site should not come into contact with water for 3 hours. Before the test, the subjects need to clean their arms uniformly by wiping them clean with a dry tissue. Determine the test area for the subject. Prepare 200 μL ± 10 μL of sodium dodecyl sulfate solution (1.0 g of sodium dodecyl sulfate dissolved in 99.0 g of pure water to prepare a 1% sodium dodecyl sulfate solution), inject it into the small chamber of the spot tester, soak filter paper in it, and apply it to the flexor side of the subject's left and right forearms, one on each side. Gently press with the palm of your hand to ensure even application to the skin, and continue for 24 hours. Thirty minutes after removing the patch, subjects sat quietly for at least 10 minutes in a laboratory with a temperature of 21±1℃ and a relative humidity of 50%±10%, without drinking water or beverages. Their forearms were exposed and placed in a test position, remaining relaxed. An appropriate amount of sample was applied to the sample area and massaged until absorbed, twice daily. After one week of sample use, participants rated the effectiveness of the sample using a questionnaire (1. Satisfied, 2. Somewhat Satisfied, 3. Somewhat Dissatisfied, 4. Dissatisfied), categorized into "positive answer group" and "negative answer group" (positive answer group = satisfied + somewhat satisfied, negative answer group = somewhat dissatisfied + dissatisfied). The combined percentage of the "positive answer group" represents the total percentage of participants who provided a satisfactory result.

[0045] Table 2

[0046] By comparing the test results of Examples 1-4 with Comparative Example 4, it can be seen that the composition of the present invention has excellent anti-inflammatory, soothing and moisturizing abilities. Although the effects of Examples 3 and 4 are not significantly different, the dosage of Example 3 is less and can achieve better results. Therefore, Example 3 is the preferred dosage, which can achieve anti-inflammatory, soothing, moisturizing and skin barrier function, and help the skin restore a stable state.

[0047] By comparing the test results of Example 3 with those of Comparative Examples 2-3 and Comparative Example 7, it can be seen that, compared with adding any one of Paraguayan tea extract, red algae extract, and urea alone, the simultaneous addition of Paraguayan tea extract, red algae extract, and urea can enhance the moisturizing, anti-inflammatory and soothing abilities of the composition of the present invention and strengthen the skin barrier function, indicating that the three have a synergistic effect.

[0048] By comparing the test results of Example 3 with those of Comparative Examples 1 and 5-6, it can be seen that, compared with adding any two of Paraguayan tea extract, red algae extract, and urea, the simultaneous addition of Paraguayan tea extract, red algae extract, and urea can enhance the moisturizing, anti-inflammatory, and soothing abilities of the composition of the present invention, further proving that Paraguayan tea extract, red algae extract, and urea have a synergistic effect.

[0049] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0050] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0051] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A skincare composition containing Paraguayan tea extract, characterized in that, It comprises the following components by weight percentage: Paraguayan tea extract 1–4%; red algae extract 0.1–5.0%; urea 0.1–3%; chelating agent 0.01–0.1%; thickener 0.01–1%; emulsifier 1–10%; oil 1–20%; polyol 0.5–10%; preservative 0.5–2%; sodium hydroxide 0.01–1%; flavoring 0.01–0.1%; balance: purified water.

2. The skincare composition containing Paraguayan tea extract according to claim 1, characterized in that, The preparation method of the Paraguayan tea extract includes the following steps: S1. Remove impurities from Paraguayan tea leaves, dry them at 75-80℃ for 1.5-2 hours, then pulverize the dried Paraguayan tea leaves into ultrafine powder and pass them through a 100-200 mesh sieve to obtain Paraguayan tea powder. S2. Mix Paraguayan tea powder with pure water, with 1g of Paraguayan tea powder corresponding to 10-30mL of pure water. After mixing, heat and reflux extraction is performed at a temperature of 75-80℃ for 55-65min. After extraction, filter through a 100-200 mesh filter cloth to obtain crude extract. S3. The crude extract was mixed with ethyl acetate and extracted. The volume ratio of crude extract to ethyl acetate was 9:

1. After extraction, vacuum distillation was performed at a pressure of 10-30 kPa, a temperature of 60-70 °C, and a time of 20-30 min to obtain Paraguayan tea extract.

3. The skincare composition containing Paraguayan tea extract according to claim 1, characterized in that, The thickener includes at least one of natural thickener, semi-synthetic thickener, and synthetic thickener; the natural thickener includes at least one of guar gum and xanthan gum; the semi-synthetic thickener includes at least one of hydroxypropyl methylcellulose and sodium carboxymethyl starch; and the synthetic thickener includes at least one of sodium polyacrylate and carbomer.

4. The skincare composition containing Paraguayan tea extract according to claim 1, characterized in that, The emulsifier includes at least one of natural emulsifiers and synthetic emulsifiers; the natural emulsifier includes at least one of lecithin and gum arabic; the synthetic emulsifier includes at least one of sodium stearate, PEG-100 stearate, and glyceryl stearate.

5. The skincare composition containing Paraguayan tea extract according to claim 1, characterized in that, The oils and fats include at least one of vegetable oils, animal oils, mineral oils, and synthetic oils and fats.

6. The skincare composition containing Paraguayan tea extract according to claim 5, characterized in that, The vegetable oil includes at least one of sunflower seed oil, almond oil, and palm oil; the animal oil includes at least one of beeswax, horse oil, and lanolin; the mineral oil includes at least one of white oil, petrolatum, and paraffin; and the synthetic oil includes at least one of isopropyl myristate, caprylic / capric triglyceride, and polydimethylsiloxane.

7. The skincare composition containing Paraguayan tea extract according to claim 1, characterized in that, The polyol includes at least one of glycerol, propylene glycol, 1,3-butanediol, and sorbitol.

8. The skincare composition containing Paraguayan tea extract according to claim 1, characterized in that, The chelating agent is EDTA-2Na.

9. The skincare composition containing Paraguayan tea extract according to claim 1, characterized in that, The preservative includes at least one of phenoxyethanol, chlorphenesin, and 1,2-hexanediol.

10. A method for preparing a skincare composition containing Paraguayan tea extract as described in any one of claims 1 to 9, characterized in that, Includes the following steps: A1. Mix the emulsifier and oil, and heat in a water bath at 78±2℃ for 20-40 minutes to obtain the oil phase; A2. Mix polyol, thickener, chelating agent and hot pure water at 85-90℃. The total mass ratio of polyol, thickener and chelating agent to hot pure water is 6:(50-60). After keeping in a water bath at 85-90℃ for 15-20 minutes, homogenize until there are no obvious particles in the mixture to obtain the aqueous phase. A3. Mix the aqueous phase and oil phase until homogenized and free of particles. Cool to 60-65°C while stirring at 3000-4000 rpm. Add sodium hydroxide to adjust the pH to 5.5-6.

5. Cool to 50-55°C. Then add preservative, Paraguayan tea extract, red algae extract, and flavoring in sequence. Stir well and add pure water. Stir until 30-35°C and discharge to obtain the finished product.

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