Facial cleansing gel capable of controlling oil and removing blackheads and preparation method of facial cleansing gel

Abstract

The invention provides cleansing gel capable of controlling oil and removing blackheads and a preparation method of the cleansing gel. The cleansing gel comprises the following components: capryloyl salicylic acid, beta-glucan, sodium cocoyl glycinate, a witch hazel extract, nano activated carbon, tea tree essential oil microcapsules and the like. Through the synergistic effect of capryloyl salicylic acid, beta-glucan, sodium cocoyl glycinate and witch hazel extract, efficient oil control, deep blackhead removal and low irritation are realized, and meanwhile, the component stability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cosmetics, and in particular to a formula and a preparation method of a cleansing gel that achieves efficient oil control, blackhead removal, and low irritation through the synergistic action of multiple components. Background Art

[0002] Skin cleansing is a fundamental step in daily skincare, crucial for maintaining healthy skin and preventing skin problems. Oil control and blackhead removal are common and challenging issues for those with oily or combination skin. Blackheads are primarily caused by the accumulation of sebum in pores, which oxidizes and darkens upon contact with air. Excessive oil secretion not only leads to blackheads but can also trigger skin problems like acne.

[0003] There are a wide variety of facial cleansing products on the market, including cleansing milks, cleansing creams, and cleansing gels. However, most products only cleanse surface dirt from the skin and are not ideal for deep-cleansing oil, removing blackheads, or controlling oil secretion over the long term. While some products containing exfoliating or absorbent ingredients can be effective in removing blackheads, they are often highly irritating and can cause dryness, tightness, and even damage to the skin, ultimately adding to the burden on the skin.

[0004] CN119925184A discloses a men's skin care composition comprising salicylic acid, a skin conditioner, a polyol, a Centella asiatica extract, and water; the skin conditioner comprises a combination of lactobionic acid, succinic acid, phytic acid, mandelic acid, and ectoine. The combination of salicylic acid, a skin conditioner, a Centella asiatica extract, and a polyol in this invention prevents damage to the skin barrier caused by excessive cleansing and significantly enhances the product's ability to protect the skin barrier. This composition is suitable for men, but due to the presence of a large amount of acidic substances, it is highly irritating to the skin and can easily cause skin damage. Women generally have higher requirements for skin care, especially for product mildness, which limits the range of patients for whom this skin care composition is suitable.

[0005] CN116270371A discloses a mild pore-shrinking and blackhead-removing composition containing saponaria officinalis extract, peppermint leaf extract, salvia miltiorrhiza extract, and clove extract. This composition facilitates the expulsion of blackheads from pores, achieving gentle pore shrinkage and blackhead removal. Furthermore, through the synergistic effects of the various ingredients, it prevents blackhead recurrence by inhibiting bacteria, suppressing sebum production, and increasing the efficiency of tissue penetration of the active ingredients. While this method reduces irritation by using multiple plant extracts, the complex extraction of these multiple plants results in a cumbersome overall preparation, and the method is unable to effectively regulate sebum secretion over the long term.

[0006] Amino acid facial cleansers are a new type of facial cleanser that has appeared on the market in recent years. CN116370349A discloses an amino acid facial cleanser that utilizes specific amino acid surfactants and skin conditioners, along with specific moisturizers and thickeners to maintain the stability of the microscopic foam walls and reduce the flow rate of the liquid within the foam walls, thereby achieving a stable foam. However, this facial cleanser still suffers from the drawback of being difficult to rinse thoroughly. Furthermore, the system suffers from poor stability and is prone to stratification and flocculation, which in turn affects the cleansing effect of the facial cleanser.

[0007] Therefore, there is an urgent need to provide a cleansing gel that can effectively control oil, remove blackheads, and is gentle and non-irritating to meet the needs of all types of people. Summary of the Invention

[0008] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a cleansing gel and a preparation method thereof, so as to achieve high efficiency in oil control and blackhead removal while being gentle and non-irritating to the skin.

[0009] To achieve the above objectives, the technical solutions adopted by the present invention include: In a first aspect, the present invention provides a cleansing gel comprising the following components: capryloyl salicylic acid, β-glucan, sodium cocoyl glycinate, witch hazel extract, nano-activated carbon, and tea tree essential oil microcapsules.

[0010] Preferably, the contents of the above components in the cleansing gel are: 0.5%-3% capryloylsalicylic acid, 0.1%-1% β-glucan, 5%-10% sodium cocoyl glycinate, 1%-5% witch hazel extract, 0.5%-2% nano activated carbon, and 1%-5% tea tree essential oil microcapsules.

[0011] Preferably, the cleansing gel further comprises a moisturizer, a thickener, and deionized water.

[0012] Preferably, the contents of the above components in the cleansing gel are: 3%-10% moisturizer, 0.5%-3% thickener, and the balance is deionized water.

[0013] Preferably, the mass ratio of the sodium cocoyl glycinate to capryloyl salicylic acid is 3:1-5:1.

[0014] Preferably, the particle size of the nano activated carbon is 50-100 nm, the specific surface area is ≥1000 m² / g, and the efficiency of adsorbing blackhead oxidized lipids is ≥90%.

[0015] Preferably, the moisturizing agent is a mixture of glycerol and panthenol in a mass ratio of 4:1-6:1.

[0016] Preferably, the capsule core of the tea tree essential oil microcapsule is tea tree essential oil, the mass percentage of terpinen-4-ol is not less than 30%, the capsule wall is a sodium alginate-chitosan complex, and the particle size is 10-50 μm.

[0017] The overall effects of the cleansing gel provided by the present invention, capryloyl salicylic acid, β-glucan, sodium cocoyl glycinate and witch hazel extract are as follows: Regular salicylic acid is a common chemical used in cosmetics. Its low pH can cause irritation to sensitive skin. Capryloyl salicylic acid, however, is a lipid derivative of salicylic acid. By adding a capryl group to its structure, it increases its fat solubility, allowing it to penetrate deeper into hair follicles and dissolve pore-clogging oil and keratin plugs (such as blackheads caused by oxidized sebum). Compared to regular salicylic acid, it is gentler, reducing the potential irritation of traditional salicylic acid, making it suitable for daily cleansing. Capryloyl salicylic acid inhibits sebaceous gland activity and reduces oil secretion.

[0018] The polyhydroxy groups (-OH) in β-glucan combine with the carboxylic acid groups of octanoylsalicylic acid through hydrogen bonds, reducing its free concentration and further reducing irritation to the skin; in addition, the hydroxyl network of β-glucan can stabilize the octanoylsalicylic acid molecules and prevent oxidative degradation (extending the shelf life by 6 months).

[0019] Sodium cocoyl glycinate is a common anionic surfactant, formed by combining coconut fatty acids with glycine. Its pH is close to neutral or slightly alkaline, providing strong cleansing power while minimizing irritation to the skin barrier. Furthermore, its surface groups electrostatically interact with the carboxylic acid groups of capryloylsalicylic acid to form micelles, enhancing its ability to encapsulate oils and fats, further improving oil control.

[0020] Witch hazel extract has a significant astringent effect, temporarily shrinking pores and reducing excessive sebaceous gland secretion, thereby reducing oiliness and clogged pores at the source, indirectly reducing the likelihood of blackhead formation. The phenolic hydroxyl group (-PhOH) of the tannic acid in witch hazel extract also interacts with the carboxylic acid group of octanoylsalicylic acid, prolonging its residence time within hair follicles.

[0021] Compared to common bamboo charcoal, nano-activated carbon particles are nanometer-sized in diameter, with a denser porous structure and a much larger surface area. This allows them to absorb more oil, dirt, and oxidized blackheads trapped in pores. While regular bamboo charcoal particles are coarse and can damage the skin barrier through physical friction (e.g., over-cleansing can lead to sensitive skin), nano-activated carbon particles are finer and can cleanse pores through adsorption, reducing mechanical irritation to the epidermis.

[0022] In a second aspect, the present invention further provides a method for preparing the cleansing gel, comprising the following steps: S1. Dissolve sodium cocoyl glycinate in 60-70°C deionized water and stir until transparent. S2. Cool to 40-45°C, add capryloyl salicylic acid, β-glucan, and witch hazel extract, and mix thoroughly. S3. Add nano-activated carbon, tea tree oil microcapsules, homogenize and emulsify, stirring at a speed of 2000-3000rpm, stirring time is 10-15 minutes; S4. Adjust the pH to 5.0-5.8, add thickener and humectant, and then fill.

[0023] In a third aspect, the present invention also provides use of the cleansing gel in preparing cosmetics for improving oily skin.

[0024] Compared with the prior art, the present invention has the following beneficial effects: The cleansing gel provided by the present invention achieves efficient oil control, deep blackhead removal and low irritation through the synergistic effect of capryloyl salicylic acid, β-glucan, sodium cocoyl glycinate and witch hazel extract, while also improving the stability of the ingredients. DETAILED DESCRIPTION

[0025] To better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments. Those skilled in the art should understand that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] Examples 1-5 Examples 1-5 of the present invention provide a cleansing gel, the specific formula of which is shown in Table 1. The preparation method of the cleansing gel comprises the following steps: S1. Dissolve the surfactant: Add sodium cocoyl glycinate to deionized water at 65 ± 2°C and stir at 500 rpm until completely dissolved (approximately 10 minutes). S2. Add active ingredients: Cool to 45 ± 2°C, add capryloylsalicylic acid, β-glucan, and witch hazel extract in sequence, and mix thoroughly (stirring at 200 rpm for 5 minutes). S3. Homogenization and emulsification: Add nano-activated carbon and tea tree oil microcapsules and homogenize and emulsify at 2500 rpm for 12 minutes; S4. Adjust pH and thicken: Use citric acid / potassium hydroxide to adjust pH to 5.5 ± 0.2, add xanthan gum, and stir until it becomes a gel-like substance. After filtering, fill into a light-proof container and sterilize under UV for 30 minutes.

[0027] Table 1 Formula of the cleansing gel described in Examples 1-5 (mass percentage)

[0028] Comparative Examples 1-5 Comparative Example 1: Compared with Example 2, β-glucan was not added, and an equal amount of deionized water was used instead, and other conditions remained unchanged; Comparative Example 2: Compared with Example 2, sodium cocoyl glycinate was replaced with sodium lauryl sulfate, and the other ingredients remained unchanged; Comparative Example 3: Compared with Example 2, the witch hazel extract was not added and was replaced with an equal amount of aloe vera extract, while other conditions remained unchanged; Comparative Example 4: Compared with Example 2, octanoyl salicylic acid was replaced with ordinary salicylic acid, and the other conditions remained unchanged; Comparative Example 5: Compared with Example 2, the nano-activated carbon was replaced with bamboo charcoal powder (particle size 1-5 μm), and the other parameters remained unchanged.

[0029] Effect Examples Test Method Oil control rate test: The instrument used is: Sebumeter SM815 (Courage+Khazaka, Germany); the specific method is: 50 volunteers with oily skin (18-35 years old) measured the amount of sebum in the T zone 6 hours after cleansing, and calculated the percentage of reduction.

[0030] Blackhead reduction rate test: The instrument used was the VISIA-CR skin analyzer (Canfield, USA). The specific method was as follows: After 50 volunteers with oily skin used the product continuously for 28 days, the changes in the number of blackheads on their noses were analyzed and the percentage of reduction was calculated.

[0031] Irritation test: Test standard: HRIPT (human skin patch test, ISO 10993-10); specific method: 50 volunteers with sensitive skin, use once a day for 14 consecutive days, and evaluate erythema and edema scores (grades 0-4).

[0032] The experimental results of the oil control rate test, blackhead reduction rate test and irritation score are shown in Table 2: Table 2 Comparison of oil control rate, blackhead reduction rate and irritation score

[0033] As can be seen from the results in Table 2, the cleansing gels in Examples 1 and 2 of the present invention can achieve good oil control and blackhead reduction rates, and are mild and non-irritating to the skin.

[0034] Comparing Comparative Example 1 with Example 2, which omitted β-glucan, the test results showed that the oil control rate in Example 2 was 83.6%, while that in Comparative Example 1 dropped to 68.5%, a decrease of 15.1%. This is because β-glucan hydrogen bonds with the carboxylic acid groups of octanoylsalicylic acid, reducing its free concentration and irritation, while also activating keratinocyte autophagy and promoting blackhead metabolism. The omission of β-glucan in Comparative Example 1 failed to neutralize the irritation of octanoylsalicylic acid (score 0.3 vs 0.2), and its keratin softening ability was reduced, resulting in significantly reduced oil control and blackhead removal effectiveness. The blackhead reduction rate in Example 2 was 73.5%, while that in Comparative Example 1 was 55.4%, a decrease of 18.1%. This suggests that β-glucan accelerates the clearance of keratin plugs by promoting autophagy, and its omission reduces the rate of blackhead metabolism and increases residual oxidized lipids.

[0035] Comparative Example 2 replaces sodium cocoyl glycinate with sodium lauryl sulfate. In terms of oil control, Example 2 achieved 83.6%, while Comparative Example 2 only achieved 62.1%, a decrease of 34.6%. This is likely due to the anionic groups of sodium cocoyl glycinate forming micelles with capryloyl salicylic acid (TEM analysis showed a 1.8-fold increase in oil adsorption), enhancing oil encapsulation efficiency. However, Comparative Example 2 uses sodium lauryl sulfate (a highly irritating surfactant), which disrupts the skin barrier and leads to a compensatory increase in sebaceous gland secretion, resulting in a sharp decrease in oil control effectiveness. Regarding irritation, Comparative Example 2 scored 2.1 (significantly higher than Example 2's 0.2), due to its disruption of the stratum corneum lipid structure, causing erythema and dryness.

[0036] Comparing Example 2 with Comparative Example 3, which omitted witch hazel extract, the blackhead reduction rate decreased by 13.2%, from 73.5% in Example 2 to 60.3% in Comparative Example 3. This suggests that the tannic acid (≥8%) in witch hazel extract interacts with octanoyl salicylic acid, prolonging its residence time within hair follicles (from 2 hours to 4 hours) while simultaneously inhibiting MMP-9 activity and reducing inflammation around blackheads. Substituting aloe vera extract in Comparative Example 3 resulted in a loss of astringent and anti-inflammatory properties, resulting in reduced blackhead removal efficiency. Regarding oil control, Example 2 achieved an oil control rate of 83.6%, while Comparative Example 3 achieved a rate of 71.8%, a decrease of 11.8%. This suggests that witch hazel, by shrinking pores and reducing sebum secretion, synergizes with octanoyl salicylic acid to inhibit 5α-reductase activity, resulting in a weakened oil control effect.

[0037] Comparative Example 4 replaces octanoyl salicylic acid with regular salicylic acid. While Example 2 achieved an oil control rate of 83.6%, Comparative Example 4 achieved only 59.7%, a 40.1% decrease. This is because the octanoyl group (C8 chain) of octanoyl salicylic acid imparts lipid solubility, allowing it to penetrate deep into hair follicles and dissolve keratin plugs. Regular salicylic acid (pH 3.2) is highly water-soluble, has poor permeability, and is highly irritating (scores 1.9 vs. 0.2), failing to effectively suppress sebum secretion. Blackhead reduction was 73.5% in Example 2, compared to 46.2% in Comparative Example 4, a 37.3% decrease. This may be due to regular salicylic acid's inability to effectively soften deep-seated keratin plugs, and its high irritation rate leads to less frequent use.

[0038] Comparative Example 5 replaces the nano-activated carbon with bamboo charcoal powder. The blackhead reduction rate for Example 2 was 73.5%, while that for Comparative Example 5 was 51.7%, a decrease of 21.8%. A comparison of nano-activated carbon and bamboo charcoal reveals that nano-activated carbon (particle size 50 nm, specific surface area ≥ 1000 m² / g) efficiently adsorbs oxidized lipids through van der Waals forces, while bamboo charcoal powder (particle size 1-5 μm) has a surface area of ​​only 200 m² / g, exhibiting insufficient adsorption capacity, and its rough particles cause frictional irritation (scores 0.5 vs. 0.2). In terms of oil control, Example 2 achieved an oil control rate of 83.6%, while Comparative Example 5 achieved a rate of 65.4%, a decrease of 21.8%. This is because nano-activated carbon absorbs free fatty acids (FFA) within hair follicles, reducing FFA stimulation on sebaceous glands, while bamboo charcoal powder cannot penetrate deeply into pores and only absorbs oil on the surface.

[0039] Finally, it should be noted that the above embodiments are intended to illustrate the technical solutions of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A cleansing gel for oil control and blackhead removal, characterized in that: Includes the following ingredients: capryloyl salicylic acid, β-glucan, sodium cocoyl glycinate, witch hazel extract, nano activated carbon, and tea tree essential oil microcapsules.

2. The cleansing gel according to claim 1, characterized in that The contents of the above components in the cleansing gel are: 0.5%-3% capryloylsalicylic acid, 0.1%-1% beta-glucan, 5%-10% sodium cocoyl glycinate, 1%-5% witch hazel extract, 0.5%-2% nano activated carbon, and 1%-5% tea tree essential oil microcapsules.

3. The cleansing gel according to claim 1, wherein The cleansing gel further comprises a moisturizer, a thickener and deionized water.

4. The cleansing gel according to claim 3, characterized in that The contents of the above components in the cleansing gel are: 3%-10% of moisturizing agent, 0.5%-3% of thickening agent, and the balance is deionized water.

5. The cleansing gel according to claim 1, wherein The mass ratio of the sodium cocoyl glycinate to capryloyl salicylic acid is 3:1-5:

1.

6. The cleansing gel according to claim 1, wherein The nano activated carbon has a particle size of 50-100 nm, a specific surface area of ​​≥1000 m² / g, and an efficiency of adsorbing blackhead oxidized lipids of ≥90%.

7. The cleansing gel according to claim 3, characterized in that The moisturizing agent is a mixture of glycerin and panthenol with a mass ratio of 4:1-6:

1.

8. The cleansing gel according to claim 1, wherein The capsule core of the tea tree essential oil microcapsule is tea tree essential oil, wherein the mass percentage of terpinene-4-ol is not less than 30%, the capsule wall is a sodium alginate-chitosan complex, and the particle size is 10-50 μm.

9. A method for preparing the cleansing gel according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Dissolve sodium cocoyl glycinate in 60-70°C deionized water and stir until transparent. S2. Cool to 40-45°C, add capryloyl salicylic acid, β-glucan, and witch hazel extract, and mix thoroughly. S3. Add nano-activated carbon, tea tree oil microcapsules, homogenize and emulsify, stirring at a speed of 2000-3000rpm, stirring time is 10-15 minutes; S4. Adjust the pH to 5.0-5.8, add thickener and humectant, and then fill.

10. Use of the cleansing gel according to any one of claims 1 to 8, or the cleansing gel obtained by the preparation method according to claim 9, in the preparation of cosmetics for improving oily skin.

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