Cold cream with high-barrier repairing effect and preparation method thereof

Abstract

The invention discloses cold cream with a high-barrier repairing effect and a preparation method thereof, and belongs to the field of cosmetics. The plant wax ester composition comprises 10-20 parts of a humectant, 5-10 parts of an emollient and 10-30 parts of a plant wax ester composition, and the plant wax ester composition is composed of 2-16 parts of plant cold grease, 3-12 parts of liquid vegetable fat and 1-5 parts of plant wax. According to the cold cream with the high-barrier repairing effect and the preparation method of the cold cream, a cold curtain tunnel technology is innovatively applied to preparation of the cold cream, a material body passing through a cold channel is rapidly crystallized, a balance critical point of solid grease and liquid grease is achieved in combination with a unique vegetable wax ester technology, and light, thin and melted skin feeling and high-grade texture are brought; the composition has good stability, can lock fresh and alive components and grease, has a remarkable relieving and redness removing effect and an efficient skin barrier repairing effect in an extreme environment, remarkably improves skin defense, has an anti-wrinkle effect, is suitable for sensitive skin and can promote post-medical repairing.

Description

Technical Field

[0001] This invention belongs to the field of cosmetics, specifically a cold cream with high barrier repair effect and its preparation method. Background Technology

[0002] Cold cream originated in ancient Greece and Rome. Traditional cold creams were mostly water-in-oil emulsions, producing a cooling sensation upon application due to the burst of water, hence the name. However, traditional cold creams often use a saponification system of fatty acids and alkalis, resulting in a greasy feel, strong occlusive properties, and a tendency to clog pores and cause breakouts, leading to a poor skin experience. Currently, some non-traditional cold creams exist on the market, using a water-in-oil system, but these suffer from a rough appearance and poor stability. Other cold creams employ low-temperature ingredient technology, such as adding cooling agents, which, while providing a cooling sensation, may also cause irritation. Therefore, there is an urgent need to develop a functional cold cream that offers a pleasant appearance and feel, is gentle and non-irritating, and possesses good stability.

[0003] Skin lipids contain approximately 26% wax esters. Wax esters are more effective than other lipids in resisting skin damage caused by oxidants and improving the skin's water retention function. Plant-based wax esters are rich in unsaponifiables, sterols, and fatty acids, and when applied to cosmetics, they can achieve similar effects, providing enhanced skin benefits. Cold curtain tunnel technology is a cooling process that achieves instantaneous and uniform cooling. Tunnel air curtains are formed at the ends of each internal section, reducing heat exchange with the external airflow and creating a negative pressure zone inside. This forms a circulating gas flow, maintaining a certain humidity and temperature within the cavity. It is primarily used in the food industry and is currently not applied in skin creams. Summary of the Invention

[0004] To address the aforementioned problems in existing technologies, the present invention aims to design and provide a technical solution for a cold cream with high barrier repair efficacy and its preparation method. It innovatively applies cold tunnel technology to the preparation of the cold cream, allowing the material to rapidly crystallize after passing through the cold tunnel. Combined with a unique plant wax ester technology, it achieves a balance point between solid and liquid oils, resulting in a lightweight, melting feel and a premium texture. It precisely locks in oil with wax esters, forming a lightweight, breathable, intelligent protective film, providing a pleasant, lightweight, melting skin experience. It exhibits good stability, locks in the freshness of active ingredients, and demonstrates significant soothing and redness-reducing effects in extreme environments. It also provides highly effective skin barrier repair, significantly enhances skin defense, and has anti-wrinkle effects. Suitable for sensitive skin, it can promote post-medical aesthetic repair.

[0005] The cold cream with high barrier repair effect is characterized by containing the following components in parts by weight: 10-20 parts of moisturizer, 5-10 parts of emollient, and 10-30 parts of plant wax ester combination. The plant wax ester composition consists of 2-16 parts of plant cold fat, 3-12 parts of liquid plant oil, and 1-5 parts of plant wax. The plant-based cold oil is at least one of the following: avocado fruit oil, guaiac resin, sage resin, large-flowered cocoa seed oil, mulberry seed oil, narrow-winged salsa seed oil, and sage kernel oil. The liquid vegetable oil is at least one of the following: starfruit palm oil, bridge fruit oil, baccharis fruit oil, avocado oil, Japanese almond oil, sweet almond oil, camellia seed oil, jojoba seed oil, meadowfoam seed oil, and sunflower seed oil. The plant wax is at least one of the following: Brazilian carnauba wax, wild lacquer fruit wax, green vitex flower wax, small candlewood wax, and silver vitex flower wax; The moisturizer is at least one of the following: glycerin, diglycerin, dipropylene glycol, butylene glycol, 1,3-propanediol, 1,2-pentanediol, 1,2-hexanediol, glyceryl polyether-26, sorbitol, erythritol, mannose, trehalose, xylitol, betaine, panthenol, sodium hyaluronate, hydrolyzed sodium hyaluronate, and β-glucan. The emollient is at least one of squalane, caprylic / capric triglyceride, undecane, tridecane, C12-15 benzoate, dioctyl carbonate, dioctyl ether, isononyl isononyl acid, pentaerythritol tetra(ethylhexanoate), isopropyl myristate, octyl dodecyl myristate, cetyl ethylhexanoate, cetearyl isononyl ester, ethylhexyl palmitate, cocoyl octanoate / silicone, propylene glycol dioctanoate / didecanoate, polydimethylsiloxane, and polysiloxane-11.

[0006] The cold cream with high barrier repair effect is characterized by further comprising the following components in parts by weight: 4-8 parts emulsifier, 0.01-0.1 parts chelating agent, 0.5-2 parts thickener, 0.1-1 parts pH adjuster, 0.1-0.5 parts colorant, 0.5-5 parts antioxidant, and 30-80 parts solvent water.

[0007] The cold cream with high barrier repair effect is characterized in that the plant wax ester preferably consists of 5-14 parts plant cold fat, 5-10 parts liquid plant oil, and 2.5-4 parts plant wax.

[0008] The cold cream with high barrier repair effect is characterized in that the plant wax ester is composed of 3-6 parts of shea butter, 1-5 parts of guaiac oil, 1-4 parts of palm kernel oil, and 1-4 parts of sage oil.

[0009] The cold cream with high barrier repair effect is characterized in that the liquid plant oil is composed of 1-5 parts of starfruit palm oil, 1-5 parts of baccharis fruit oil, 1-5 parts of camellia seed oil, and 0.2-2 parts of bridge fruit oil.

[0010] The cold cream with high barrier repair effect is characterized in that the plant wax is composed of 0.3-3 parts of carnauba wax, 0.3-2 parts of lacquer fruit wax, and 0.3-2 parts of green vitex flower wax.

[0011] The cold cream with high barrier repair efficacy is characterized in that the emulsifier is at least one selected from glyceryl stearate, PEG-100 stearate, sorbitan stearate, sorbitan tristearate, sorbitan oleate, polysorbate-20, polysorbate-80, cetearyl glucoside, hydrogenated lecithin, polyglycerol-3 methyl glucoside distearate, stearyl alcohol polyether-20, cetyl alcohol polyether-20, PPG-24-glyceryl polyether-24, soybean (Glycine soja) seed extract, and polyglycerol-3 polyricinoleate; the cold cream with high barrier repair efficacy is characterized in that the chelating agent is at least one selected from disodium EDTA, tetrasodium EDTA, trisodium ethylenediamine disuccinate, and inositol hexaphosphate. The cold cream with high barrier repair effect is characterized in that the thickener is at least one of carbomer, xanthan gum, sodium polyacrylate, acrylamide / sodium acryloyldimethyl taurate copolymer, and ammonium acryloyldimethyl taurate / VP copolymer; The cold cream with high barrier repair effect is characterized in that the pH adjuster is at least one of citric acid, sodium citrate, and sodium hydroxide; The cold cream with high barrier repair effect is characterized in that the colorant is at least one of caramel color, carmine, β-carotene, carrot root extract, and comfrey root extract; The cold cream with high barrier repair efficacy is characterized in that the antioxidant is at least one of tocopherol, p-hydroxyacetophenone, myristyl nicotinate, and ascorbate tetraisopalmitate.

[0012] The method for preparing a cold cream with high barrier repair efficacy is characterized by comprising the following steps: 1) Heat the aqueous raw materials, including solvent, humectant and chelating agent, to 80-85℃, stir at 200-800 rpm until homogeneous, and keep warm for 10-15 minutes; 2) The oil phase raw materials include emollients, plant cold fats, plant waxes, plant liquid oils and emulsifiers. Heat to 80-85℃, stir evenly at 200-800 rpm, and keep warm for 10-15 minutes. 3) Homogenize the aqueous phase and oil phase at a constant temperature for 5-15 minutes at a homogenization speed of 1500-3000 rpm, add thickener and homogenize for 5-15 minutes at a homogenization speed of 1500-3000 rpm. 4) Stir and cool, add antioxidant, pH adjuster and colorant, homogenize for 5 to 15 minutes at a speed of 1200 rpm to 2800 rpm; 5) Cool down to 40-50℃ to obtain the cold frost precursor; 6) The filling equipment temperature is set to 40-50℃. After filling into the packaging material, it is placed in the cold curtain tunnel equipment for rapid cooling at -10 to -25℃ for 5-10 minutes, resulting in instantaneous rapid cooling and molding. 7) Aging at 0-20℃ for 5-25 days yields cold frost.

[0013] The method for preparing a cold cream with high barrier repair effect is characterized in that, in step 1), the temperature is 82-83℃, the rotation speed is 400-500rpm, and the heat preservation time is 12-13min. In step 2): temperature 82-83℃, rotation speed 400-500rpm, holding time 12-13min; In step 3): homogenization time is 8-10 min, homogenization speed is 2000-2500 rpm, thickener is added and homogenization is 10-12 min, homogenization speed is 1800-2200 rpm; In step 4): homogenize for 10-12 minutes at a speed of 1500-2000 rpm; In step 5): Cool down to 45-48℃; In step 7): aging at 5-10℃ for 10-20 days to obtain cold frost.

[0014] The method for preparing a cold cream with high barrier repair efficacy is characterized in that, in step 6), the rapid cooling temperature is -15 to -20°C and the rapid cooling time is 6 to 8 minutes.

[0015] The above-mentioned cold cream with high barrier repair efficacy and its preparation method have the following beneficial effects compared with the prior art: The cold cream provided by this invention has a high-end appearance and texture. The unique wax ester ratio combined with the cold curtain tunnel can precisely lock in the oil with wax esters, achieve skin oil balance, and form a light and breathable intelligent defense film, thereby bringing a good light and melting skin feel experience. The cold cream provided by this invention uses a rapid cooling process to instantly lock in freshness, preventing the precipitation of unsaponifiables, sterols, and fatty acids, which are abundant in plant wax esters, from the emulsion particles, thus hindering their absorption by the skin. Under high and low temperature conditions, the cold cream can maintain a uniform particle size and has good stability, allowing the effective substances in plant wax esters to exert their effects stably. The cold cream provided by this invention has a significant soothing and redness-reducing effect in extreme environments, a highly effective skin barrier repair effect, and a significant improvement in skin defense; it also has anti-wrinkle effects, is suitable for sensitive skin, and can promote post-medical aesthetic repair. Attached Figure Description

[0016] Figure 1 Microscopic images of the cold frost of Example 1 at different temperatures; Figure 2 3D facial color imaging of subject number 14; Figure 3 Example image of subject number 29 - soothing effect; Figure 4 Example image of subject number 29 - effect of improving nasolabial folds; Figure 5 Example image of subject number 23 - effect of improving forehead wrinkles; Figure 6 Example image of subject number 30 - improvement in jawline. Detailed Implementation

[0017] The technical solution of the present invention will be clearly described below with reference to corresponding embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Table 1 Cold Cream Formulations for Examples 1-5 The formula for the cold cream in Example 1 is shown in Table 1 above. The specific preparation of the cold cream includes the following steps: 1. The aqueous phase raw materials, including solvent, humectant and chelating agent, are heated to 82℃, stirred at 500rpm until homogeneous, and kept at this temperature for 12min; 2. The oil phase raw materials include emollients, plant cold fats, plant waxes, plant liquid oils and emulsifiers. Heat to 82℃, stir evenly at 500rpm, and keep warm for 12min. 3. Homogenize the aqueous and oil phases at 2500 rpm for 8 min, add thickener, and homogenize at 2200 rpm for 10 min; 4. Stir and cool, add antioxidant, pH adjuster and colorant, and homogenize at 2000 rpm for 10 min; 5. Cool down to 48℃ to obtain the cold frost precursor; 6. The filling equipment temperature is set to 48℃. After filling into the packaging material, it is placed in the cold curtain tunnel equipment and rapidly cooled for 8 minutes at a temperature of -15℃ for instantaneous rapid cooling and molding. 7. After aging at 8℃ for 15 days, cold frost is obtained.

[0019] The formula for the cold cream in Example 2 is shown in Table 1 above. The specific preparation of the cold cream includes the following steps: 1. The aqueous phase raw materials, including solvent, humectant and chelating agent, are heated to 80℃, stirred at 200rpm until homogeneous, and kept at this temperature for 15min. 2. The oil phase raw materials include emollients, plant cold fats, plant waxes, plant liquid oils and emulsifiers. Heat to 80℃, stir at 200rpm until homogeneous, and keep warm for 15 minutes. 3. Homogenize the aqueous and oil phases at 3000 rpm for 5 minutes, add thickener, and homogenize at 3000 rpm for 5 minutes. 4. Stir and cool, add antioxidant, pH adjuster and colorant, and homogenize at 2800 rpm for 5 min; 5. Cool down to 50℃ to obtain the cold frost precursor; 6. The filling equipment temperature is set to 50℃. After filling into the packaging material, it is placed in the cold curtain tunnel equipment and rapidly cooled for 5 minutes at a temperature of -25℃ for instantaneous rapid cooling and molding. 7. After aging at 5℃ for 8 days, cold frost is obtained.

[0020] The formula for the cold cream in Example 3 is shown in Table 1 above. The specific preparation of the cold cream includes the following steps: 1. The aqueous phase raw materials, including solvent, humectant and chelating agent, are heated to 85℃, stirred at 800rpm until homogeneous, and kept at this temperature for 10min. 2. The oil phase raw materials include emollients, plant cold fats, plant waxes, plant liquid oils and emulsifiers. Heat to 85℃, stir at 800rpm until homogeneous, and keep warm for 10 minutes. 3. Homogenize the aqueous and oil phases at 1500 rpm for 15 min, add thickener, and homogenize at 1500 rpm for 15 min. 4. Stir and cool, add antioxidant, pH adjuster and colorant, homogenize at 1200 rpm for 15 min; 5. Cool down to 40℃ to obtain the cold frost precursor; 6. The filling equipment temperature is set to 40℃. After filling into the packaging material, it is placed in the cold curtain tunnel equipment and rapidly cooled for 10 minutes at a temperature of -10℃ for instantaneous rapid cooling and molding. 7. After aging at 20℃ for 25 days, cold frost is obtained.

[0021] The formula for the cold cream in Example 4 is shown in Table 1 above. The specific preparation of the cold cream includes the following steps: 1. The aqueous phase raw materials, including solvent, humectant and chelating agent, are heated to 83°C, stirred at 400 rpm until homogeneous, and kept at this temperature for 12 min. 2. The oil phase raw materials include emollients, plant cold fats, plant waxes, plant liquid oils and emulsifiers. Heat to 83℃, stir at 600rpm until homogeneous, and keep warm for 12 minutes. 3. Homogenize the aqueous and oil phases at 2000 rpm for 12 min, add thickener, and homogenize at 2000 rpm for 12 min. 4. Stir and cool, add antioxidant, pH adjuster and colorant, homogenize at 1500 rpm for 12 min; 5. Cool down to 43℃ to obtain the cold frost precursor; 6. The filling equipment temperature is set to 45℃. After filling into the packaging material, it is placed in the cold curtain tunnel equipment and rapidly cooled for 6 minutes at a temperature of -18℃ for instantaneous rapid cooling and molding. 7. After aging at 12℃ for 20 days, cold frost is obtained.

[0022] The formula for the cold cream in Example 5 is shown in Table 1 above. The specific preparation of the cold cream includes the following steps: 1. The aqueous phase raw materials, including solvent, humectant and chelating agent, are heated to 82℃, stirred at 600rpm until homogeneous, and kept at this temperature for 13min; 2. The oil phase raw materials include emollients, plant cold fats, plant waxes, plant liquid oils and emulsifiers. Heat to 82℃, stir at 600rpm until homogeneous, and keep warm for 13 minutes. 3. Homogenize the aqueous and oil phases at 2200 rpm for 10 min, add thickener, and homogenize at 2200 rpm for 10 min. 4. Stir and cool, add antioxidant, pH adjuster and colorant, and homogenize at 1800 rpm for 10 min; 5. Cool down to 46℃ to obtain the cold frost precursor; 6. The filling equipment temperature is set to 46℃. After filling into the packaging material, it is placed in the cold curtain tunnel equipment and rapidly cooled for 8 minutes at a temperature of -20℃ for instantaneous rapid cooling and molding. 7. After aging at 10℃ for 10 days, cold frost is obtained.

[0023] Comparative Example 1: Compared with Example 1, this comparative example is the same as Example 1 except that the material was not treated with cold curtain tunnel technology after discharge.

[0024] Comparative Example 2: Compared with Example 1, the plant wax ester combination in this comparative example consists of 8.8 parts of plant cold esters, 5.2 parts of liquid plant oils, and 0.5 parts of plant waxes. Specifically, the proportions are: 4 parts of shea butter, 1 part of guacamole, 2.8 parts of star palm kernel oil, 1 part of sagebrush butter, 3 parts of baccharis fruit oil, 1 part of star palm fruit oil, 1 part of camellia seed oil, 0.2 parts of bridge fruit oil, 0.2 parts of carnauba wax, 0.1 parts of wild lacquer fruit wax, and 0.2 parts of green chaste tree flower wax. The remaining raw materials and their amounts are the same as in Example 1. The mixture is balanced with water to 100 parts, and the preparation method is the same as in Example 1.

[0025] The following test results and experimental data further demonstrate the beneficial effects of the present invention.

[0026] Experiment 1: Hardness Test The test was conducted at 25℃, and the hardness of the prepared cold cream was measured using a viscometer (BROOKFIELD DV2TRVTJ0). The hardness test results are shown in Table 2.

[0027] Table 2 Hardness Test Results As shown in Table 2, the cold creams in Examples 1-5 treated with the cold curtain tunnel technology have a significantly higher hardness than the untreated Comparative Example 1 and Comparative Example 2 with different wax ester ratios. This is because the rapid cooling process and unique plant wax ester technology allow the plant-based cooling oils, liquid plant fats, and plant waxes to reach a balanced critical point, resulting in a solid appearance. Without the rapid cooling process or with an unsuitable wax ester ratio, the cold cream cannot achieve sufficient hardness. Therefore, the cold curtain tunnel technology combined with the unique plant wax ester formulation method provided by this invention allows the cream to exhibit a more solid appearance and texture.

[0028] Experiment 2: Stability Test The above-described examples and comparative examples were placed under different environmental conditions for different periods of time: one month at -18℃, 5℃, 25℃, 40℃, 48℃, and three months under light conditions. The stability of the samples was then tested, and the results were observed at 4 weeks and 12 weeks. The test results are shown in Table 3.

[0029] Table 3 Stability Test Results As shown in Table 3, the ointments of Examples 1-5 have better stability. Comparative Examples 1 and 2 exhibited instability, such as coarsening at low temperatures and oiliness at high temperatures. Figure 2It is evident that the cold cream prepared using the cold curtain tunneling technology provided by this invention, combined with a unique wax ester ratio, exhibits uniform particle size with minimal variation under both high and low temperature conditions, resulting in a more stable formulation structure. This avoids particle size variations caused by poor stability of the cold cream, which could lead to the precipitation of some oil-soluble active ingredients within the emulsion particles, hindering their absorption by the skin and affecting product efficacy. Therefore, the cold cream prepared using the cold curtain tunneling technology combined with a unique wax ester ratio provided by this invention possesses excellent stability, instantly locking in freshness and allowing the unsaponifiables, sterols, and fatty acids abundant in plant wax esters to maintain their efficacy.

[0030] Experiment 3: Skin Feel Evaluation Test Ten professional team members used the prepared Examples 1-5, Comparative Example 1 and Comparative Example 2 to evaluate the melting sensation, penetration sensation, film-forming sensation and stickiness of the skin feel after application and absorption. The scores ranged from 1 to 9 points. The higher the score, the stronger the melting sensation, penetration sensation, film-forming sensation and stickiness. The mean data of the skin feel evaluation results are shown in Table 4.

[0031] Table 4. Results of Skin Feel Evaluation Test As shown in Table 4, compared to the comparative examples, Examples 1-5 exhibited better melting and penetration sensations, a thin and breathable film texture, and lower greasiness. Therefore, the cold curtain tunnel technology combined with the wax ester formulation delivers a three-stage skin experience: from cream to oil to film. The initial stage features a firm cream that melts into a smooth, silky texture upon application; the middle stage, upon contact with the skin, gradually releases elastic oils through massage with body temperature, penetrating layer by layer; and the final stage, after complete absorption, transforms into a breathable film, providing high hydration while enhancing skin's breathability. Due to the rapid cooling process, precise and quick solidification is achieved, locking in oil with wax esters and enhancing their mutual fusion effect. This allows for oil repair while simultaneously achieving skin oil balance. Therefore, the cold cream provided by this invention, with its unique combination of plant-based wax esters, melts upon contact with the skin and automatically adjusts according to environmental changes. It is breathable at high temperatures and locks in moisture at low temperatures. Combined with the cold curtain tunnel technology, it precisely locks in oil with wax esters, achieving skin oil balance and forming a thin, breathable, intelligent protective film, resulting in a superior, thin, melting skin experience.

[0032] Experiment 4: Stimulation Test Thirty-two volunteers, aged 18-60 years, were selected. Irritation tests were conducted according to the "Cosmetic Safety Technical Specifications 2015 Edition" – Human Skin Patch Test. Samples from Examples 1-5 and Comparative Examples 1-2 were added to a patch applicator. The applicator containing the sample was then applied to the back of the subject using non-irritating adhesive tape. Gently pressing with the palm of the hand ensured even application to the skin. After 24 hours, the patch applicator was removed, and any remaining sample was gently wiped away with a moistened cotton ball. Skin reactions were observed 0.5 hours after the indentation disappeared, and again at 24 and 48 hours after patch removal. Reaction results were recorded according to a grading standard. If fewer than five people experienced Grade 1 adverse skin reactions and no Grade 2-4 adverse skin reactions were observed, the product was considered to have no adverse effects on humans. Test results are shown in Table 5.

[0033] Table 5 Results of the Stimulation Test As shown in Table 5, the patch test results showed that only a few Grade 1 adverse reactions occurred in Example 2 and Comparative Example 1, but there were fewer than 5 people and no Grade 2 to 4 skin adverse reactions. Therefore, it can be determined that there are no adverse reactions in humans. Thus, the face creams of the examples and comparative examples all showed no adverse reactions in humans, indicating that the cold cream provided by the present invention has high safety and is gentle and non-irritating.

[0034] Experiment 5: Performance Testing in Extreme Environments Thirty-five healthy Chinese subjects aged 18-60 years with dry, rough skin, facial redness, erythema, and symptoms such as burning, stinging, itching, and tightness, a Bauman Skin Type Questionnaire (Sensitive Skin) score ≥30, and who used the test product once, were placed in a low-temperature environment (-8℃±2℃) for 30 minutes. Researchers randomly selected one side of each subject as the experimental group, using the test product (prepared in Example 1), while the other side served as the control group, without any product. Skin measurements were taken before, immediately after, and 30 minutes after the low-temperature environment. The stratum corneum moisture content was measured using a Corneometer, transepidermal water loss (TEWL) was measured using a Tewameter™ Hex probe, and the Erythema Index (EI) was measured using a Mexameter MX 18 probe. Facial images were captured using VISA-CR. Descriptive statistics were performed on each measurement using Excel, and data were analyzed using SPSS software. A significance level of P < 0.05 was considered. The test results are shown in Table 6.

[0035] Table 6 Results of Extreme Environment Efficacy Tests As shown in Table 6, compared with before the low temperature, the water content of the stratum corneum on the cheeks increased significantly by 34.84% immediately after product application and by 44.35% after 30 minutes of low temperature. Furthermore, the experimental group showed a significantly better trend in stratum corneum water content compared to the control group. Compared with before the low temperature, the transepidermal water loss rate of the cheek skin decreased significantly by 10.01% immediately after product application and by 22.20% after 30 minutes of low temperature. The experimental group also showed a lower trend in transepidermal water loss rate compared to the control group. Compared with before the low temperature, the erythema index (EI) value decreased significantly by 6.92% immediately after product application and by 13.90% after 30 minutes of low temperature. The experimental group also showed a significantly lower trend in EI value compared to the control group. Simultaneously, from... Figure 2 It can be clearly seen that the skin's moisture content remains at a high level even in low-temperature environments, demonstrating that using the face cream of this invention can enhance the skin's resistance to cold environments. Therefore, the cold cream provided by this invention has high soothing, redness-reducing, repairing, and moisturizing effects in extremely cold environments, exhibiting highly effective skin barrier repair and significantly improving skin's defense capabilities. The products prepared in Examples 2-5 of this invention, used as test products, also achieve the beneficial effects described in this invention.

[0036] Experiment 6: Post-medical aesthetic treatment efficacy test Thirty-one healthy Chinese subjects aged 18-60 years with dry, rough skin, facial redness, erythema, and symptoms such as burning, stinging, itching, and tightness, a Bauman Skin Type Questionnaire (Sensitive Skin) score ≥30, and who underwent phototherapy, were selected. After the subjects underwent phototherapy, researchers randomly selected one side of the subject's face as the experimental group and the other side as the control group. The experimental group used the cold cream provided by this invention (the product prepared in Example 1), while the control group did not use the product. The subjects used the product continuously for one week. During the test, they could not use cosmetics or drugs with similar effects to the product. Skin was tested before the medical treatment (BL), after the medical treatment (BL'), one day after using the product (D1), three days after using the product (D3), and one week after using the product (W1). The skin stratum corneum moisture content was measured using a Corneometer, transepidermal water loss (TEWL) was measured using a Tewameter™ Hex probe, and the skin erythema index (EI) value was measured using a Mexameter MX 18 probe for skin erythema and hemoglobin testing. Facial images were captured using a VISA-CR. Descriptive statistics for each measurement value were performed using Excel. Data were analyzed using SPSS software. The significance level was P < 0.05. The test results are shown in Table 7.

[0037] Table 7 Results of efficacy tests after cosmetic surgery Table 7 shows that the stratum corneum moisture content significantly increased after the cosmetic procedure compared to before. However, there was no significant difference in the trend of stratum corneum moisture content change between the experimental group and the control group. Compared to after the cosmetic procedure, the trend of stratum corneum moisture content change was significant in the experimental group after using the test product for 1 day, 3 days, and 1 week. The transdermal water loss rate test results show that compared to after the cosmetic procedure, the transdermal water loss rate of the experimental group decreased significantly by 8.11% after 1 day, 15.81% after 3 days, and 22.27% after 1 week. Furthermore, the trend of transdermal water loss rate change was significantly better in the experimental group than in the control group. Regarding the skin erythema index, compared to after the cosmetic procedure, the EI value decreased significantly by 6.98%, 11.89%, and 18.38% after 1 day, 3 days, and 1 week, respectively. The trend of EI value change was significantly better in the experimental group than in the control group. Additionally, no adverse reactions were observed when using the cold cream after the cosmetic procedure, indicating that the cold cream provided by this invention can be used after the cosmetic procedure. Figure 3 It is evident that after one week of use, the subjects' skin was effectively soothed, indicating that the cold cream prepared according to this invention can promote post-medical aesthetic repair and has moisturizing, repairing, and soothing effects. The products prepared in Examples 2-5 of this invention, used as test products, also achieved the beneficial effects described in this invention.

[0038] Experiment 7: Skincare Efficacy Test Thirty-four healthy Chinese subjects aged 30-65 years were selected. They had facial redness and erythema, and were prone to burning, stinging, itching, and tightness. Their wrinkle grades were 2-4, their lactic acid stinging test was positive, and their total score was ≥3. They considered their facial skin to be dry, rough, and with fine lines. After cleansing in the morning and evening, and following their basic skincare routine, they applied an appropriate amount of the cold cream from Example 1 evenly to their facial skin and gently pressed it into absorption. During the test, they did not use other skincare products with similar effects, avoided prolonged outdoor activities, and paid attention to sun protection. The volunteers' faces were selected as the test sites. Tests were conducted before use (BL), 14 days after use (W2), and 28 days after use (W4) after cleansing: A Corneometer was used to measure the stratum corneum hydration; a higher value indicated higher stratum corneum hydration. A Tewameter™ Hex was used to measure transepidermal water loss (TEWL); a lower value indicated less transepidermal water loss. A Glossymeter GL 200 was used to measure skin radiance; a higher value indicated more radiant skin. A Mexameter MX 18 probe was used to measure the Erythema Index (EI), which represents the relative content of hemoglobin in the skin; a higher value indicated a higher relative content of hemoglobin in the skin. A VISIA-CR facial image analyzer was used to acquire facial images, which were then processed using Image software. Image analysis was performed on J. The larger the angle between the tangent of the facial contour line and the horizontal line, the more significant the facial lifting. The EvaFACE rapid optical imaging system was used to test the area, volume, average depth, and perimeter of wrinkles. The lower the value, the smaller the wrinkles were. Descriptive statistics of each measurement value were performed using Excel, and the data were analyzed using SPSS software. The significance level was P < 0.05. The test results are shown in Tables 8 and 9.

[0039] Soothing and repairing effects Table 8 Efficacy Test Results As shown in Table 8, when subjects used the cold cream prepared in Example 1, compared with before use, the moisture content of the stratum corneum of the skin significantly increased by 33.79% after 2 weeks and by 49.26% after 4 weeks, indicating that the cold cream of the present invention significantly improves the moisture content of the stratum corneum. The transepidermal water loss rate of the subjects' skin significantly decreased by 10.62% after 2 weeks and by 17.87% after 4 weeks, showing a significant improvement in transepidermal water loss rate. The Erythema Index (EI) value significantly decreased by 10.34% after 2 weeks and by 20.36% after 4 weeks, showing a significant improvement. Skin luster significantly increased by 24.23% after 2 weeks and by 39.48% after 4 weeks; the EI value significantly decreased by 10.34% after 2 weeks and by 20.36% after 4 weeks. Therefore, the cold cream provided by the present invention has significant soothing, moisturizing, and repairing effects. The products obtained in Examples 2-5 of the present invention, as test products, also achieved the beneficial effects described in the present invention.

[0040] Anti-wrinkle efficacy test Table 9. Results of Anti-wrinkle Efficacy Test As shown in Table 9, compared with before use, the subjects using the cold cream prepared in Example 1 showed that the area of ​​nasolabial folds decreased significantly by 6.15% after 2 weeks and by 10.53% after 4 weeks; the volume of nasolabial folds decreased significantly by 6.82% after 2 weeks and by 13.13% after 4 weeks; the average depth of nasolabial folds improved significantly by 4.25% after 4 weeks and by 4.80% after 4 weeks; and the circumference of nasolabial folds decreased significantly by 5.37% after 2 weeks and by 8.07% after 4 weeks. Figure 4 As shown, the cold cream provided by this invention can significantly improve nasolabial folds; regarding forehead wrinkles, the wrinkle area significantly decreased by 8.85% after 2 weeks and by 11.73% after 4 weeks; the wrinkle volume significantly decreased by 15.21% after 4 weeks; the average wrinkle depth significantly improved by 1.83% after 4 weeks and by 2.20% after 4 weeks; and the wrinkle circumference significantly decreased by 9.19% after 4 weeks. Figure 5 As shown, the cold cream provided by this invention can significantly improve forehead wrinkles; after 2 weeks of use, the outer angle of the jawline significantly improved by 6.06%, and after 4 weeks, it significantly improved by 8.54%, combined with... Figure 6 As shown, the cold cream prepared using this invention can significantly improve the outer angle of the jawline; therefore, the cold cream provided by this invention has a significant improvement effect on nasolabial folds, forehead wrinkles, and the jawline, thus the cold cream provided by this invention has a firming and anti-wrinkle effect. The products obtained in Examples 2-5 of this invention, as test products, can also achieve the beneficial effects described in this invention.

[0041] (3) Lactic acid stinging test The subjects were given a 10% lactic acid solution applied to their nasolabial folds before application (BL), after 14 days of application (W2), and after 28 days of application (W4). The subjects' sensations of stinging, burning, and itching after application were observed and recorded. Trained professional researchers inquired about the subjects' subjective symptoms and scored them on a 4-point scale: 0 points, no stinging, burning, or itching; 1 point, mild stinging, burning, or itching; 2 points, noticeable stinging; 3 points, very intense stinging, burning, or itching, even unbearable. Data were analyzed using SPSS software. A significance level of P < 0.05 was considered. The test results are shown in Table 8.

[0042] Table 10 Results of Lactic Acid Sting Test As shown in Table 10, after 2 and 4 weeks of using the cold cream of Example 1 provided by this invention, the nasolabial fold lactic acid stinging score was significantly reduced. Therefore, it can be concluded that the cold cream prepared by this invention is suitable for sensitive skin. The products obtained in Examples 2-5 of this invention also achieved the beneficial effects described in this invention during skincare efficacy testing.

[0043] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A cold cream having high barrier repair efficacy, characterized in that The plant wax ester is preferably, plant cold fat 5-14 parts, liquid plant oil fat 5-10 parts, plant wax 2.5-4 parts. The plant wax ester is preferably, plant cold fat 5-14 parts, liquid plant oil fat 5-10 parts, plant wax 2.5-4 parts. The plant cold fat is at least one of avocado fruit fat, copal asu fat, ambroside fat, theobroma grandiflorum seed fat, vitellaria paradoxa seed fat, pterocarpus macrocarpus seed fat, and vaccinium starfruit kernel oil. The liquid plant oil fat is at least one of starfruit kernel oil, bridge fruit oil, bacassat fruit oil, avocado oil, Japanese almond oil, sweet almond oil, camellia seed oil, jojoba seed oil, white pool flower seed oil, and sunflower seed oil. The plant wax is at least one of carnauba wax, genipa wax, green ash flower wax, candelilla wax, and mimosa flower wax. The moisturizing agent is at least one of glycerin, diglycerin, dipropylene glycol, butanediol, 1,3-propanediol, 1,2-pentanediol, 1,2-hexanediol, glycerol polyether-26, sorbitol, erythritol, mannose, trehalose, xylitol, betaine, panthenol, sodium hyaluronate, hydrolyzed sodium hyaluronate, and beta-glucan. The emulsifier is at least one of glyceryl stearate, PEG-100 stearate, sorbitan stearate, sorbitan tristearate, sorbitan oleate, polysorbate-20, polysorbate-80, cetearyl glucoside, hydrogenated lecithin, polyglyceryl-3 methylglucose distearate, steareth-20, ceteareth-20, PPG-24-glyceryl polyether-24, glycine soja seed extract, and polyglyceryl-3 polyricinoleate.

2. The cold cream having high barrier repair efficacy according to claim 1, wherein The emulsifier is at least one of glyceryl stearate, PEG-100 stearate, sorbitan stearate, sorbitan tristearate, sorbitan oleate, polysorbate-20, polysorbate-80, cetearyl glucoside, hydrogenated lecithin, polyglyceryl-3 methylglucose distearate, steareth-20, ceteareth-20, PPG-24-glyceryl polyether-24, glycine soja seed extract, and polyglyceryl-3 polyricinoleate.

3. The cold cream having high barrier repair efficacy according to claim 1, wherein ​ 4. The cold cream having high barrier repair efficacy according to claim 1, wherein ​ 5. The cold cream having high barrier repair efficacy according to claim 1, wherein ​ 6. The cold cream having high barrier repair efficacy according to claim 1, wherein ​ 7. The cold cream having high barrier repair efficacy according to claim 2, wherein ​ The cold cream with high barrier repair efficacy, characterized in that the chelating agent is at least one of disodium EDTA, tetrasodium EDTA, trisodium ethylenediamine disuccinate, myo-inositol hexaphosphate; The cold cream with high barrier repair efficacy, characterized in that the thickening agent is at least one of carbomer, xanthan gum, sodium polyacrylate, acrylamide / sodium acryloyldimethyl taurate copolymer, ammonium acryloyldimethyltaurate / VP copolymer; The cold cream with high barrier repair efficacy, characterized in that the pH regulator is at least one of citric acid, sodium citrate, sodium hydroxide; The cold cream with high barrier repair efficacy, characterized in that the colorant is at least one of caramel color, cochineal, beta-carotene, carrot root extract, and radix lithospermi extract; The cold cream with high barrier repair efficacy, characterized in that the antioxidant is at least one of tocopherol, p-hydroxyacetophenone, myristyl nicotinate, ascorbic acid tetraisopalmitate.

8. The method for preparing a cold cream with high barrier repair efficacy as described in claim 2, characterized in that... The method comprises the following steps: 1) Heat the water phase raw materials including solvent, humectant, and chelating agent to 80-85°C, and uniformly stir at a speed of 200-800 rpm for 10-15 min; 2) Heat the oil phase raw materials including emollient, vegetable cold fat, vegetable wax, vegetable liquid fat, and emulsifier to 80-85°C, and uniformly stir at a speed of 200-800 rpm for 10-15 min; 3) Homogenize the water phase and the oil phase for 5-15 min at a speed of 1500-3000 rpm, and then add the thickening agent and homogenize for 5-15 min at a speed of 1500-3000 rpm; 4) Stir and cool, add the antioxidant, pH regulator, and colorant, and homogenize for 5-15 min at a speed of 1200-2800 rpm; 5) Cool to 40-50°C to obtain a cold cream precursor; 6) Set the temperature of the filling equipment to 40-50°C, fill into a package, and then place into a cold curtain tunnel equipment for rapid cooling at a temperature of -10 to -25°C for 5-10 min to form instantaneously; 7) Age at an environment of 0-20°C for 5-25 days to obtain the cold cream.

9. The method of claim 8, wherein the cold cream having high barrier repair efficacy is prepared by In step 1), the temperature is 82-83°C, the stirring speed is 400-500 rpm, and the holding time is 12-13 min; In step 2), the temperature is 82-83°C, the stirring speed is 400-500 rpm, and the holding time is 12-13 min; In step 3), the homogenization time is 8-10 min, the homogenization speed is 2000-2500 rpm, the thickening agent is added and homogenized for 10-12 min at a speed of 1800-2200 rpm; In step 4), the homogenization time is 10-12 min, and the homogenization speed is 1500-2000 rpm; In step 5), the temperature is cooled to 45-48°C; In step 7), the environment is aged at 5-10°C for 10-20 days to obtain the cold cream.

10. A method for preparing a cold cream with high barrier repair efficacy as described in claim 8, characterized in that... In step 6), the rapid cooling temperature is -15 to -20°C, and the rapid cooling time is 6-8 min.

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