Oil-control and blackhead-removing cleansing gel and preparation method thereof

Abstract

The present application provides a kind of oil control and blackhead removal cleansing jelly and its preparation method.The cleansing jelly of the present application includes octanoyl salicylic acid, beta-glucan, sodium cocoyl glycinate, hamamelis extract, nano activated carbon, tea tree essential oil microcapsule and other components.Through the synergistic effect of octanoyl salicylic acid, beta-glucan, sodium cocoyl glycinate and hamamelis extract, efficient oil control, deep blackhead removal and low irritation are achieved, and the stability of the components is also improved.

Description

Technical Field

[0001] This invention relates to the field of cosmetic technology, specifically to a facial cleansing gel formula and preparation method that achieves efficient oil control, blackhead removal, and low irritation through the synergistic effect of multiple components. Background Technology

[0002] Skin cleansing is a fundamental step in daily skincare, playing a crucial role in maintaining skin health and preventing skin problems. This is especially true for people with oily or combination skin, as oil control and blackhead removal are common and challenging issues. Blackheads form primarily due to the accumulation of sebum (oil) in pores, which oxidizes and turns black upon contact with air. Excessive sebum production not only leads to blackheads but can also trigger other skin problems such as acne.

[0003] There are many types of facial cleansers on the market, including cleansing milk, cleansing cream, and cleansing gel. However, most of these products can only simply clean the surface of the skin and are not ideal for deeply cleaning oil from pores, removing blackheads, or controlling sebum secretion in the long term. Some products containing exfoliating or absorbent ingredients may have some effect on removing blackheads, but they are often too irritating and can lead to dry, tight, or even damaged skin, thus increasing the burden on the skin.

[0004] CN119925184A discloses a men's skincare composition comprising salicylic acid, a skin conditioning agent, a polyol, centella asiatica extract, and water. The skin conditioning agent comprises a combination of lactobionic acid, succinic acid, inositol hexaphosphate, mandelic acid, and tetrahydromethylpyrimidine carboxylic acid. This composition, through the combined use of salicylic acid, the skin conditioning agent, centella asiatica extract, and the polyol, can prevent over-cleansing from damaging the skin barrier and significantly enhance the product's protective function for the skin barrier. While this composition is suitable for men, the presence of a large amount of acidic substances makes it highly irritating to the skin and prone to causing skin damage. Women typically have higher requirements for skincare, especially for the gentleness of products, thus limiting the suitable user group for this skincare composition.

[0005] CN116270371A discloses a mild pore-shrinking blackhead-removing composition comprising soapwort extract, peppermint leaf extract, salvia miltiorrhiza extract, and clove extract. This composition facilitates the removal of blackheads from pores, achieving gentle pore shrinkage and thus blackhead removal. Simultaneously, through the synergistic effect of the various components, it aims to prevent blackhead recurrence by inhibiting bacteria, suppressing sebum production, and improving the penetration efficiency of the active ingredients into tissues. While this method reduces irritation through the use of multiple plant extracts, the extraction process for these plants is complex, leading to a cumbersome overall preparation process. Furthermore, this method cannot provide long-term and effective regulation of sebum secretion.

[0006] Amino acid facial cleansers are a new type of facial cleanser that has emerged on the market in recent years. CN116370349A discloses an amino acid facial cleanser that, by using specific amino acid surfactants and skin conditioning agents, and through the selection of specific moisturizers and thickeners, maintains the stability of the microscopic foam walls and reduces the flow rate of liquid within the foam walls, thereby achieving a stable foam effect. However, this facial cleanser still has the drawback of being difficult to rinse off completely, and the system has poor stability, easily separating / flocculating, thus affecting the cleansing effect.

[0007] Therefore, there is an urgent need to provide a facial cleansing gel that can effectively control oil and remove blackheads while being gentle and non-irritating, in order to meet the needs of various groups of people. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a facial cleansing gel and its preparation method, so as to achieve efficient oil control and blackhead removal while being gentle and non-irritating to the skin.

[0009] To achieve the above objectives, the technical solution adopted by the present invention includes:

[0010] In a first aspect, the present invention provides a facial cleansing gel comprising the following components: capryloyl salicylic acid, β-glucan, sodium cocoyl glycinate, witch hazel extract, nano-activated carbon, and tea tree oil microcapsules.

[0011] Preferably, the content of the above components in the facial cleansing gel is as follows: capryloyl salicylic acid 0.5%-3%, β-glucan 0.1%-1%, sodium cocoyl glycinate 5%-10%, witch hazel extract 1%-5%, nano activated carbon 0.5%-2%, and tea tree oil microcapsules 1%-5%.

[0012] Preferably, the facial cleansing gel further includes a moisturizer, a thickener, and deionized water.

[0013] Preferably, the content of the above-mentioned components in the facial cleansing gel is: 3%-10% moisturizer, 0.5%-3% thickener, and the balance being deionized water.

[0014] Preferably, the mass ratio of sodium cocoyl glycinate to capryloyl salicylic acid is 3:1-5:1.

[0015] Preferably, the nano-activated carbon has a particle size of 50-100nm, a specific surface area of ​​≥1000m² / g, and an adsorption efficiency of ≥90% for blackhead oxidized lipids.

[0016] Preferably, the moisturizer is a mixture of glycerin and panthenol in a mass ratio of 4:1 to 6:1.

[0017] Preferably, the core of the tea tree oil microcapsule is tea tree oil, wherein the mass percentage of terpinene-4-ol is not less than 30%, and the capsule wall is a sodium alginate-chitosan complex with a particle size of 10-50 μm.

[0018] The overall effects of the facial cleansing gel provided by this invention, comprising capryloyl salicylic acid, β-glucan, sodium cocoyl glycinate, and witch hazel extract, are as follows:

[0019] Regular salicylic acid is a commonly used chemical in cosmetics. Due to its low pH, it may irritate sensitive skin. Capryloyl salicylic acid, on the other hand, is an esterified derivative of salicylic acid. By adding an capryloyl group to its structure, it enhances its lipid solubility, allowing it to penetrate deeper into the hair follicles and dissolve sebum and keratin plugs clogging pores (such as blackheads formed from oxidized sebum). Compared to regular salicylic acid, it is gentler and reduces the potential irritation caused by traditional salicylic acid, making it suitable for daily cleansing. Capryloyl salicylic acid can also inhibit sebaceous gland activity and reduce oil secretion.

[0020] The polyhydroxy groups (-OH) in β-glucan bind to the carboxylic acid groups of capryloyl salicylic acid through hydrogen bonds, reducing its free concentration and further reducing skin irritation. In addition, the hydroxyl network of β-glucan can stabilize capryloyl salicylic acid molecules and prevent oxidative degradation (extending shelf life by 6 months).

[0021] Sodium cocoyl glycinate is a common anionic surfactant composed of coconut oil fatty acids and glycine. Its pH is close to neutral or weakly alkaline, providing strong cleansing power while minimizing irritation to the skin barrier. Simultaneously, its surface groups can form micelles with the carboxylic acid groups of capryloyl salicylic acid through electrostatic interactions, enhancing its ability to encapsulate oils and further improving oil control.

[0022] Witch hazel extract has a significant astringent effect, which can temporarily shrink pores and reduce excessive sebum secretion, thereby reducing oily skin and clogged pores at the source and indirectly reducing the probability of blackhead formation. The phenolic hydroxyl group (-PhOH) of tannic acid in witch hazel extract can also interact with the carboxylic acid group of capryloyl salicylic acid, prolonging its residence time in the hair follicle.

[0023] Compared to common bamboo charcoal, nano-activated carbon particles have a diameter at the nanometer level, resulting in a denser porous structure and a significantly larger specific surface area. This allows it to absorb more oil, dirt, and oxidized blackheads from pores. While ordinary bamboo charcoal particles are relatively coarse and may damage the skin barrier due to physical friction (such as causing sensitive skin due to over-cleansing), nano-activated carbon particles are finer and can cleanse pores through adsorption, reducing mechanical irritation to the epidermis.

[0024] Secondly, the present invention also provides a method for preparing the aforementioned facial cleansing gel, comprising the following steps:

[0025] S1. Dissolve sodium cocoyl glycinate in deionized water at 60-70℃ and stir until transparent;

[0026] S2. Cool to 40-45℃, add capryloyl salicylic acid, β-glucan, and witch hazel extract, and mix well;

[0027] S3. Add nano-activated carbon and tea tree essential oil microcapsules, homogenize and emulsify, stirring at 2000-3000 rpm for 10-15 minutes;

[0028] S4. Adjust the pH to 5.0-5.8, add thickener and humectant, and then fill.

[0029] Thirdly, the present invention also provides the use of the cleansing gel in the preparation of cosmetics for improving oily skin.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] The facial cleansing gel provided by this 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 Implementation

[0032] To better illustrate the objectives, technical solutions, and advantages of this invention, the invention will be further described below with reference to specific embodiments. Those skilled in the art should understand that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0033] Examples 1-5

[0034] Examples 1-5 of the present invention provide a facial cleansing gel, the specific formula of which is shown in Table 1. The preparation method of the facial cleansing gel includes the following steps:

[0035] S1. Dissolving the surfactant: Add sodium cocoyl glycinate to deionized water at 65±2℃ and stir at 500 rpm until completely dissolved (about 10 minutes).

[0036] S2. Add active ingredients: Cool to 45±2℃, add capryloyl salicylic acid, β-glucan and witch hazel extract in sequence, and mix well (stirring speed 200rpm, time 5 minutes).

[0037] S3. Homogenization and emulsification: Add nano-activated carbon and tea tree essential oil microcapsules, and homogenize and emulsify at 2500 rpm for 12 minutes;

[0038] S4. Adjust pH and thicken: Adjust pH to 5.5±0.2 with citric acid / potassium hydroxide, add xanthan gum, and stir until gel-like; filter and fill into light-proof containers, then sterilize under UV light for 30 minutes.

[0039] Table 1. Formulation of the facial cleansing gels described in Examples 1-5 (percentage by mass)

[0040]

[0041] Comparative Examples 1-5

[0042] Comparative Example 1: Compared with Example 2, no β-glucan was added, and an equal amount of deionized water was used instead; all other aspects remained the same.

[0043] Comparative Example 2: Compared with Example 2, sodium cocoyl glycinate was replaced with sodium lauryl sulfate, while all other aspects remained unchanged;

[0044] Comparative Example 3: Compared with Example 2, witch hazel extract was not added, but was replaced with an equal amount of aloe vera extract, and everything else remained the same;

[0045] Comparative Example 4: Compared with Example 2, capryloyl salicylic acid was replaced with ordinary salicylic acid, and everything else remained the same;

[0046] Comparative Example 5: Compared with Example 2, nano-activated carbon was replaced with bamboo charcoal powder (particle size 1-5 μm), and everything else remained the same.

[0047] Example of effect

[0048] Test methods

[0049] Oil control rate test: The instrument used was Sebumeter SM815 (Germany Courage+Khazaka); the specific method was as follows: 50 volunteers with oily skin (18-35 years old) had their T-zone sebum content measured 6 hours after cleansing, and the percentage reduction was calculated.

[0050] Blackhead reduction rate test: The instrument used was the VISIA-CR skin analyzer (Canfield, USA); the specific method was as follows: after 50 oily skin volunteers used it continuously for 28 days, the change in the number of blackheads on the nose was analyzed and the percentage reduction was calculated.

[0051] Irritation test: Test standard: HRIPT (Human skin patch test, ISO 10993-10); The specific method is: 50 volunteers with sensitive skin use it once a day for 14 consecutive days, and the erythema and edema scores (0-4) are evaluated.

[0052] The results of the oil control rate test, blackhead reduction rate test, and irritation score are shown in Table 2:

[0053] Table 2 Comparison of oil control rate, blackhead reduction rate, and irritation score

[0054]

[0055] As shown in Table 2, the facial cleansing gels in Examples 1 and 2 of this invention can achieve good oil control and blackhead reduction rates, and are gentle and non-irritating to the skin.

[0056] Compared to Example 2, without the addition of β-glucan, the test results showed that in terms of oil control rate, Example 2 achieved 83.6%, while Example 1 decreased to 68.5%, a drop of 15.1%. This is because β-glucan binds to the carboxylic acid group of capryloyl salicylic acid through hydrogen bonds, reducing the free concentration and irritation, while simultaneously activating keratinocyte autophagy and promoting blackhead metabolism. In Example 1, the absence of β-glucan did not neutralize the irritation of capryloyl salicylic acid (score 0.3 vs 0.2), and the keratin softening ability decreased, resulting in a significant reduction in oil control and blackhead removal effects. Regarding blackhead reduction rate, Example 2 achieved 73.5%, while Example 1 achieved 55.4%, a decrease of 18.1%, indicating that β-glucan accelerates the removal of keratin plugs by promoting autophagy; its absence reduces the blackhead metabolism rate and increases residual oxidized lipids.

[0057] Compared to Example 2, sodium cocoyl glycinate was replaced with sodium lauryl sulfate in Comparative Example 2. Regarding oil control rate, Example 2 achieved 83.6%, while Comparative Example 2 only achieved 62.1%, a decrease of 34.6%. This may be due to the anionic group of sodium cocoyl glycinate forming micelles with capryloyl salicylic acid (TEM showed a 1.8-fold increase in oil adsorption), enhancing oil encapsulation efficiency. Comparative Example 2, using sodium lauryl sulfate (a highly irritating surfactant), disrupted the skin barrier, leading to compensatory increased sebum secretion and a sharp drop in oil control effect. In terms of irritation, Comparative Example 2 had an irritation score of 2.1 (significantly higher than Example 2's 0.2), as it disrupted the lipid structure of the stratum corneum, causing erythema and dryness.

[0058] Compared to Example 2, without the addition of witch hazel extract, the blackhead reduction rate in Example 2 was 73.5%, while in Comparative Example 3 it was 60.3%, a decrease of 13.2%. It is preliminarily inferred that the tannins (≥8%) in witch hazel extract interact with capryloyl salicylic acid, prolonging the time the extract remains in the hair follicle (from 2 hours to 4 hours), while simultaneously inhibiting MMP-9 activity and reducing inflammation around blackheads. Replacing Comparative Example 3 with aloe vera extract resulted in the loss of astringent and anti-inflammatory effects, leading to a decrease in blackhead removal efficiency. Regarding oil control, Example 2 had an oil control rate of 83.6%, while Comparative Example 3 had a rate of 71.8%, a decrease of 11.8%. This indicates that witch hazel reduces sebum secretion by shrinking pores and synergistically inhibits 5α-reductase activity with capryloyl salicylic acid; its absence weakens the oil control effect.

[0059] Compared to Example 2, Comparative Example 4 replaced capryloyl salicylic acid with regular salicylic acid. Regarding oil control, Example 2 achieved 83.6%, while Comparative Example 4 only achieved 59.7%, a decrease of 40.1%. This is because the capryloyl group (C8 chain) of capryloyl salicylic acid gives it lipid solubility, allowing it to penetrate deep into the hair follicle and dissolve keratin plugs. Regular salicylic acid (pH 3.2), due to its strong water solubility, poor permeability, and high irritation (score 1.9 vs 0.2), cannot effectively inhibit sebum secretion for a long time. Regarding blackhead reduction, Example 2 achieved 73.5%, while Comparative Example 4 achieved 46.2%, a decrease of 37.3%. This may be because regular salicylic acid cannot effectively soften deep keratin plugs, and its high irritation leads to reduced user frequency of use.

[0060] Compared to Example 2, Comparative Example 5 replaced nano-activated carbon with bamboo charcoal powder. Regarding blackhead reduction, Example 2 showed a reduction of 73.5%, while Comparative Example 5 showed 51.7%, a decrease of 21.8%. Comparing nano-activated carbon and bamboo charcoal, it can be seen that nano-activated carbon (particle size 50nm, specific surface area ≥1000m² / g) efficiently adsorbs oxidized lipids through van der Waals forces, while bamboo charcoal powder (particle size 1-5μm) has a specific surface area of ​​only 200m² / g, resulting in insufficient adsorption capacity, and its coarse particles cause frictional irritation (score 0.5 vs 0.2). Regarding oil control, Example 2 showed an oil control rate of 83.6%, while Comparative Example 5 showed 65.4%, a decrease of 21.8%. This is because nano-activated carbon adsorbs free fatty acids (FFA) within the hair follicle, reducing the stimulation of sebaceous glands by FFA, while bamboo charcoal powder cannot penetrate deep into the pores and can only adsorb oil on the surface.

[0061] Finally, it should be noted that the above embodiments are used to illustrate the technical solutions of the present invention and not 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 modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A facial cleansing gel for controlling oil and removing blackheads, characterized in that, The product comprises the following components: capryloyl salicylic acid, β-glucan, sodium cocoyl glycinate, witch hazel extract, nano-activated carbon, and tea tree oil microcapsules; wherein the mass percentage content of the above components in the cleansing gel is as follows: capryloyl salicylic acid 0.5%-3%, β-glucan 0.1%-1%, sodium cocoyl glycinate 5%-10%, witch hazel extract 1%-5%, nano-activated carbon 0.5%-2%, and tea tree oil microcapsules 1%-5%; the mass ratio of sodium cocoyl glycinate to capryloyl salicylic acid is 3:1-5:1; the nano-activated carbon has a particle size of 50-100nm, a specific surface area ≥1000m² / g, and an adsorption efficiency of ≥90% for blackhead oxidized lipids; the core of the tea tree oil microcapsules is tea tree oil, wherein the mass percentage of terpinen-4-ol is not less than 30%, and the capsule wall is a sodium alginate-chitosan complex with a particle size of 10-50μm.

2. The facial cleansing gel according to claim 1, characterized in that, The facial cleansing gel also includes moisturizers, thickeners, and deionized water.

3. The facial cleansing gel according to claim 2, characterized in that, The cleansing gel contains: 3%-10% by mass of moisturizer, 0.5%-3% by mass of thickener, and the remainder is deionized water.

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

1.

5. A method for preparing the facial cleansing gel according to any one of claims 2-4, characterized in that, Includes the following steps: S1. Dissolve sodium cocoyl glycinate in deionized water at 60-70℃ and stir until transparent; S2. Cool to 40-45℃, add capryloyl salicylic acid, β-glucan, and witch hazel extract, and mix well; S3. Add nano-activated carbon and tea tree essential oil microcapsules, homogenize and emulsify, stirring at 2000-3000 rpm for 10-15 minutes; S4. Adjust the pH to 5.0-5.8, add thickener and humectant, and then fill.

6. The cleansing gel according to any one of claims 1-4, or the cleansing gel obtained by the preparation method according to claim 5, in the preparation of cosmetics for improving oily skin.

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