A pure natural salt mud mask with water supplementing and oil control and a preparation method thereof

Abstract

This invention belongs to the field of skincare technology and discloses a pure natural salt mud mask with moisturizing and oil-controlling properties and its preparation method. The pure natural salt mud mask with moisturizing and oil-controlling properties comprises, by weight, the following ingredients: 15-20 parts salt mud, 0.8-1.2 parts aloe vera extract, 0.8-1.2 parts seaweed extract, 0.1-0.3 parts centella asiatica extract, 0.1-0.3 parts vitamin E, 2.5-3.5 parts glycerin, 0.2-0.4 parts xanthan gum, 0.08-0.12 parts phenoxyethanol, 0.1-0.12 parts hydroxyethyl cellulose, and 70-80 parts deionized water. This invention utilizes the synergistic effect of centella asiatica extract and salt mud to effectively alleviate the mild irritation of salt mud, repair the skin barrier, and achieve oil control, acne clearing, moisturizing repair, and mineral nourishment while also possessing soothing, stabilizing, gentle, and safe characteristics. It is suitable for all skin types, and the preparation process is simple and easy for industrial production.

Description

Technical Field

[0001] This invention relates to the field of skincare technology, and more particularly to a salt mud mask. Background Technology

[0002] As skincare concepts evolve towards natural, gentle, and functional approaches, mineral mud masks have gained widespread attention due to their advantages such as deep cleansing, oil absorption, and mineral replenishment. Among them, salt mud, as a natural mineral raw material, is rich in beneficial minerals such as potassium, calcium, magnesium, and zinc, possessing excellent adsorption, cleansing, and mineral nourishing capabilities, making it an ideal raw material for preparing natural mud masks. Existing research indicates that this type of salt mud has multiple positive effects on beauty and skincare: its high salt content and mineral elements can accelerate skin cell metabolism, strengthen cell membrane surfaces, and accelerate the elimination of toxins by promoting the secretion of sweat and sebaceous glands; simultaneously, the gentle mechanical pressure and micro-particle friction effect generated during application not only helps remove dead skin cells and dirt from sebaceous pores but also improves local blood circulation and lymphatic drainage, providing nourishment, tightening, and anti-wrinkle effects to the skin. For example, patent CN108619009A discloses a beauty salt mud containing minerals, which achieves multiple effects such as deep cleansing, activating collagen, removing dead skin, clearing skin toxins and resisting ultraviolet rays by controlling the percentage concentration of mineral salt mud to 20%-50% and utilizing components such as potassium, sodium, magnesium, calcium and iodine.

[0003] However, despite the excellent cosmetic potential of salt mud, existing salt mud masks still have significant drawbacks: First, salt mud itself is somewhat irritating, and its use alone can easily cause slight redness and tightness of the skin, making it unsuitable for sensitive skin; second, existing formulas mostly rely on chemical soothing agents to reduce irritation, lacking naturalness and easily damaging the skin barrier; third, there is a lack of targeted active ingredients scientifically combined with salt mud, making it difficult to balance cleansing and gentleness, resulting in limited efficacy and insufficient synergy.

[0004] Centella asiatica extract, as a natural plant active ingredient, has significant effects in repairing the skin barrier, soothing redness, and improving sensitivity. However, there is currently no known technology that combines it with desalinated mud to utilize their synergistic effects and address the irritation associated with mud, while simultaneously achieving a multi-functional approach of cleansing, nourishing, and soothing. Therefore, developing a pure natural face mask that uses mud as its core ingredient, combined with natural components such as centella asiatica extract, and balances cleansing power with gentleness, safety, and effectiveness, has significant practical application value. Summary of the Invention

[0005] To address the issues of existing salt mud masks, which offer strong cleansing power but are prone to causing slight irritation and lack gentleness, this invention proposes a pure natural salt mud mask with moisturizing and oil-controlling properties, along with its preparation method. By scientifically combining salt mud with centella asiatica extract, the two complement each other and enhance their effects. While retaining the deep cleansing and mineral nourishing advantages of salt mud, centella asiatica extract soothes and repairs, reducing irritation, thus balancing cleansing power and gentleness. The formula is purely natural and non-irritating, suitable for all skin types, especially for long-term use on sensitive skin.

[0006] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0007] A pure natural salt mud mask with moisturizing and oil-controlling properties, the raw materials by weight include: 15-20 parts salt mud, 0.8-1.2 parts aloe vera extract, 0.8-1.2 parts seaweed extract, 0.1-0.3 parts asiaticoside, 0.1-0.3 parts vitamin E, 2.5-3.5 parts glycerin, 0.2-0.4 parts xanthan gum, 0.08-0.12 parts phenoxyethanol, 0.1-0.12 parts hydroxyethyl cellulose, and 70-80 parts deionized water.

[0008] The salt mud mentioned above is mine salt mud. Furthermore, the salt mud mentioned above is salt mud powder with a pretreated pH of 7-8 (particle size ≤150 μm).

[0009] The aforementioned aloe vera extracts (such as dried aloe vera leaf powder) possess excellent moisturizing, soothing, and anti-inflammatory effects, and can repair the skin barrier. Seaweed extracts (such as brown algae extract), with a sodium alginate content ≥30%, combine moisturizing, thickening, and repairing properties, enhancing the mask's feel and stability.

[0010] The aforementioned asiaticoside has the effects of repairing the skin barrier, soothing redness and sensitivity, promoting wound healing, and improving the fragile state of the skin.

[0011] The preparation method of the above-mentioned all-natural salt mud mask with moisturizing and oil-controlling properties is as follows:

[0012] (1) Salt mud pretreatment: Add appropriate water to the salt mud to make a fluid slurry, and place it in a mixing container. Slowly add citric acid aqueous solution to it, stir evenly, adjust the pH of the system to 7.0-8.0, and stop stirring. Place the pH-adjusted salt mud slurry in a stainless steel pan and dry it at 80-90℃ for 12 hours. Then, grind it and sieve it through a 100-200 mesh screen to remove coarse particles and impurities, and collect the salt mud powder with uniform particle size, which is the pretreated salt mud, for later use. This step removes coarse particles from the salt mud and adjusts the pH of the salt mud to ensure that the mask is delicate and skin-friendly, and avoids friction and irritation to the skin from particles.

[0013] (2) Aqueous phase preparation: Pour deionized water into a mixing tank, add aloe vera extract, seaweed extract, xanthan gum, asiaticoside and phenoxyethanol, heat to 40-45℃, stir at low speed (400-600 rpm) for 15-20 min until all ingredients are completely dissolved to obtain a transparent aqueous phase; the active ingredients are dissolved at a gentle temperature to avoid high temperature damage to natural active substances such as aloe vera and seaweed, thus preserving the skin care efficacy.

[0014] (3) Homogenization and emulsification: Add the pretreated salt mud from step (1) to the transparent aqueous phase obtained in step (2), heat to 40-45℃, and homogenize at 2000-3000 rpm for 8-12 min until the system is fine, uniform, and free of particles, thus obtaining an emulsified system. Homogenization and emulsification allow the salt mud and aqueous phase to fully blend, improving the fineness and stability of the mask and enhancing its adsorption and cleaning power.

[0015] (4) Low-temperature addition: Cool the emulsified system obtained in step (3) to room temperature, add vitamin E, and stir at low speed for 5-8 minutes to mix evenly. Adding vitamin E at low temperature avoids high-temperature oxidation and loss of efficacy, thus preserving its antioxidant, anti-aging, and water-locking effects. Then, add glycerin to pre-disperse hydroxyethyl cellulose and stir at 900-1200 rpm for 15-20 minutes until the hydroxyethyl cellulose is completely swollen, thus obtaining the pure natural salt mud mask. Glycerin pre-dispersion prevents hydroxyethyl cellulose from clumping, ensuring the stability and uniform texture of the mask system.

[0016] The beneficial effects of this invention are:

[0017] (1) The raw materials are natural and safe, and gentle and non-irritating. The core of this invention uses salt mud, combined with pure natural active ingredients such as aloe vera extract, seaweed extract, centella asiatica extract, and vitamin E. It does not contain mineral oil, alcohol, artificial coloring, or heavy metals, and can be used for a long time by people with sensitive skin, fragile skin, and pregnant women. It is highly safe.

[0018] (2) Comprehensive and synergistic effects, multiple benefits in one. The salt mud used in this invention is rich in natural mineral elements, which deeply absorbs oil, blackheads and dirt from pores, controls oil and clears acne, and regulates the skin's water-oil balance; aloe vera extract soothes inflammation and repairs the skin barrier; seaweed extract moisturizes and locks in moisture and enhances skin elasticity; centella asiatica repairs redness and improves sensitivity; vitamin E has antioxidant and anti-aging properties and delays skin aging. Multiple effects work synergistically to take into account cleansing, oil control, moisturizing, repair and anti-aging.

[0019] (3) Delicate texture and excellent skin feel. The pre-treatment and homogenization process of this invention results in a mask with a delicate texture that is easy to spread, without any grainy feel. It does not cause dryness or tightness after application, is gentle on the skin, easy to wash off, and suitable for all skin types.

[0020] (4) The process is simple and easy to industrialize. The preparation conditions are mild, no complicated equipment is required, the raw materials are readily available, the cost is controllable, the process is highly stable, and it can be mass-produced, which meets the development needs of the green skin care industry. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a picture of actual salt mud powder.

[0023] Figure 2 This is an X-ray photoelectron spectroscopy (XPS) image of salt mud powder.

[0024] Figure 3 This is an X-ray diffraction (XRD) pattern of salt mud powder.

[0025] Figure 4 This is a photograph of the salt mud mask prepared according to the present invention. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the 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.

[0027] The specific information about the raw materials used in this invention is as follows:

[0028] Salt mud, pure natural well mine salt mud from Pingdingshan, Henan Pingmei Shenma Tiantai Salt Industry Co., Ltd.

[0029] Seaweed extract, commercially available (Si'an Hongyangkang Co., Ltd.), powder product.

[0030] Aloe vera extract, commercially available (Si'an Hongyangkang Co., Ltd.), in powder form.

[0031] Glycerin, commercially available, CAS No.: 56-81-5.

[0032] Vitamin E, commercially available, CAS No.: 2074-53-5.

[0033] Xanthan gum, commercially available, CAS No.: 11138-66-2.

[0034] Hydroxyethyl cellulose, commercially available, 9004-62-0.

[0035] Phenoxyethanol, commercially available, CAS No.: 901-44-0.

[0036] Centella asiatica extract, commercially available, CAS No.: 16830-15-2.

[0037] Example 1

[0038] This embodiment of the all-natural salt mud mask with moisturizing and oil-controlling properties includes the following ingredients by weight: 18 parts salt mud, 1 part aloe vera extract, 1 part seaweed extract, 0.2 parts centella asiatica extract, 0.2 parts vitamin E, 3 parts glycerin, 0.3 parts xanthan gum, 0.1 parts phenoxyethanol, 0.1 parts hydroxyethyl cellulose, and 76.2 parts deionized water.

[0039] The actual image of the salt mud used in this embodiment is shown below. Figure 1 As shown. By Figure 2 It is known that salt mud contains Na, O, C, Cl, Ca, and Mg elements. (From...) Figure 3 It can be seen that the specific substances contained in the salt mud include CaSO4·2H2O, CaCO3 and NaCl, and the NaCl content is reduced after washing with water.

[0040] The preparation method of the all-natural salt mud mask with moisturizing and oil-controlling properties in this embodiment is as follows:

[0041] (1) Pretreatment of salt mud: Add appropriate amount of water to the salt mud to make a slurry with good fluidity, and put it in a mixing container. Slowly add citric acid aqueous solution to it, stir evenly, adjust the pH of the system to 7.5, and stop stirring. Place the salt mud slurry with adjusted pH in a stainless steel pan, dry it at 90℃ for 12 h, then grind it and sieve it through a 100 mesh to remove coarse particles and impurities, and collect salt mud powder with uniform particle size, which is the pretreated salt mud powder, for later use.

[0042] (2) Preparation of aqueous phase: 76.2 parts of deionized water were injected into a stirred tank, and 1 part of aloe vera extract, 1 part of seaweed extract, 0.3 parts of xanthan gum, 0.2 parts of asiaticoside and 0.1 parts of phenoxyethanol were added. The mixture was heated to 42°C and stirred at low speed (400 rpm) for 20 minutes until all components were completely dissolved, resulting in a clear aqueous phase. All parts mentioned below are calculated as 100 g.

[0043] (3) Homogenization and emulsification: Add the salt mud powder (18 parts) pretreated in step (1) to the transparent aqueous phase liquid obtained in step (2), heat to 42℃, homogenize at 2400 rpm for 8 min until the system is fine and uniform and without particles, and obtain the emulsified system.

[0044] (4) Low-temperature addition: Cool the emulsion system obtained in step (3) to room temperature, add 0.2 parts of vitamin E, and stir at low speed (500 rpm) for 8 min to mix evenly. Then, add glycerol pre-dispersed hydroxyethyl cellulose (3 parts of glycerol and 0.1 parts of hydroxyethyl cellulose), stir at 1000 rpm for 20 min until the hydroxyethyl cellulose is completely swollen, and you will get a pure natural salt mud mask.

[0045] Example 2

[0046] This embodiment of the all-natural salt mud mask with moisturizing and oil-controlling properties includes the following ingredients by weight: 20 parts salt mud, 1.2 parts aloe vera extract, 1.2 parts seaweed extract, 0.3 parts centella asiatica extract, 0.3 parts vitamin E, 3.5 parts glycerin, 0.4 parts xanthan gum, 0.12 parts phenoxyethanol, 0.12 parts hydroxyethyl cellulose, and 70 parts deionized water.

[0047] The preparation method of the all-natural salt mud mask with moisturizing and oil-controlling properties in this embodiment is as follows:

[0048] (1) Pretreatment of salt mud: Add appropriate water to the salt mud to make a slurry with good fluidity, and put it in a mixing container. Slowly add citric acid aqueous solution to it, stir evenly, adjust the pH of the system to 8, and stop stirring. Place the salt mud slurry with adjusted pH in a stainless steel pan, dry it at 90℃ for 12 h, then grind it and sieve it through a 100-mesh sieve to remove coarse particles and impurities, and collect salt mud powder with uniform particle size, which is the pretreated salt mud powder, for later use.

[0049] (2) Aqueous phase preparation: 70 parts of deionized water were injected into a stirred tank, and 1.2 parts of aloe vera extract, 1.2 parts of seaweed extract, 0.4 parts of xanthan gum, 0.3 parts of asiaticoside and 0.12 parts of phenoxyethanol were added. The mixture was heated to 45°C and stirred at low speed (500 rpm) for 15 minutes until all components were completely dissolved to obtain a transparent aqueous phase.

[0050] (3) Homogenization and emulsification: Add the salt mud powder (20 parts) pretreated in step (1) to the transparent aqueous phase liquid obtained in step (2), heat to 45℃, homogenize at 2000 rpm for 12 min until the system is fine and uniform and without particles, and obtain the emulsified system.

[0051] (4) Low-temperature addition: Cool the emulsion system obtained in step (3) to room temperature, add 0.3 parts of vitamin E, and stir at low speed (500 rpm) for 8 min to mix evenly. Then, add glycerol pre-dispersed hydroxyethyl cellulose (3.5 parts of glycerol and 0.12 parts of hydroxyethyl cellulose), stir at 1000 rpm for 15 min until the hydroxyethyl cellulose is completely swollen, and you will get a pure natural salt mud mask.

[0052] Example 3

[0053] This embodiment of the all-natural salt mud mask with moisturizing and oil-controlling properties includes the following ingredients by weight: 15 parts salt mud, 0.8 parts aloe vera extract, 0.8 parts seaweed extract, 0.1 parts centella asiatica extract, 0.1 parts vitamin E, 2.5 parts glycerin, 0.2 parts xanthan gum, 0.08 parts phenoxyethanol, 0.1 parts hydroxyethyl cellulose, and 80 parts deionized water.

[0054] The preparation method of the all-natural salt mud mask with moisturizing and oil-controlling properties in this embodiment is as follows:

[0055] (1) Pretreatment of salt mud: Add appropriate water to the salt mud to make a slurry with good fluidity, and put it in a mixing container. Slowly add citric acid aqueous solution to it, stir evenly, adjust the pH of the system to 8, and stop stirring. Place the salt mud slurry with adjusted pH in a stainless steel pan, dry it at 90℃ for 12 h, then grind it and sieve it through a 100-mesh sieve to remove coarse particles and impurities, and collect salt mud powder with uniform particle size, which is the pretreated salt mud powder, for later use.

[0056] (2) Aqueous phase preparation: 80 parts of deionized water were injected into a stirred tank, and 0.8 parts of aloe vera extract, 0.8 parts of seaweed extract, 0.2 parts of xanthan gum, 0.1 parts of asiaticoside and 0.08 parts of phenoxyethanol were added. The mixture was heated to 40°C and stirred at low speed (600 rpm) for 18 minutes until all components were completely dissolved to obtain a transparent aqueous phase.

[0057] (3) Homogenization and emulsification: Add 15 parts of the salt mud powder pretreated in step (1) to the transparent aqueous phase liquid obtained in step (2), heat to 40°C, homogenize at 2000 rpm for 10 min until the system is fine and uniform and free of particles, and obtain the emulsified system.

[0058] (4) Low-temperature addition: Cool the emulsion system obtained in step (3) to room temperature, add 0.1 parts of vitamin E, and stir at low speed (600 rpm) for 5 min to mix evenly. Then, add glycerol pre-dispersed hydroxyethyl cellulose (2.5 parts of glycerol and 0.1 parts of hydroxyethyl cellulose), and stir at 1200 rpm for 18 min until the hydroxyethyl cellulose is completely swollen, thus obtaining the pure natural salt mud mask. Actual images of the salt mud masks prepared in Examples 1-3 of this invention are shown below. Figure 4 As shown.

[0059] Comparative Example 1

[0060] This comparative example of a pure natural salt mud mask differs from Example 1 in that it does not contain aloe vera extract, seaweed extract, or centella asiatica extract. The ingredients, by weight, include: 18 parts salt mud, 0.2 parts vitamin E, 3 parts glycerin, 0.3 parts xanthan gum, 0.1 parts phenoxyethanol, 0.1 parts hydroxyethyl cellulose, and 76.2 parts deionized water.

[0061] The preparation method of this comparative example of a pure natural salt mud mask is as follows:

[0062] (1) Pretreatment of salt mud: Add appropriate water to the salt mud to make a slurry with good fluidity, and put it in a mixing container. Slowly add citric acid aqueous solution to it, stir evenly, adjust the pH of the system to 8, and stop stirring. Place the salt mud slurry with adjusted pH in a stainless steel pan, dry it at 90℃ for 12 h, then grind it and sieve it through a 100-mesh sieve to remove coarse particles and impurities, and collect salt mud powder with uniform particle size, which is the pretreated salt mud powder, for later use.

[0063] (2) Aqueous phase preparation: 76.2 parts of deionized water were injected into the stirred tank, 0.3 parts of xanthan gum and 0.1 parts of phenoxyethanol were added, the temperature was raised to 42°C, and the mixture was stirred at low speed (400 rpm) for 20 min until all components were completely dissolved to obtain a transparent aqueous phase.

[0064] (3) Homogenization and emulsification: Add the salt mud powder (18 parts) pretreated in step (1) to the transparent aqueous phase liquid obtained in step (2), heat to 42℃, homogenize at 2400 rpm for 8 min until the system is fine and uniform and without particles, and obtain the emulsified system.

[0065] (4) Low-temperature addition: Cool the emulsion system obtained in step (3) to room temperature, add 0.2 parts of vitamin E, and stir at low speed (400 rpm) for 8 min to mix evenly. Then, add glycerol pre-dispersed hydroxyethyl cellulose (3 parts of glycerol and 0.1 parts of hydroxyethyl cellulose), stir at 900 rpm for 20 min until the hydroxyethyl cellulose is completely swollen, and you will get a pure natural salt mud mask.

[0066] Comparative Example 2

[0067] This comparative example of a pure natural salt mud mask differs from Example 1 in that it does not contain aloe vera extract. The ingredients, by weight, include: 18 parts salt mud, 1 part seaweed extract, 0.2 parts asiaticoside, 0.2 parts vitamin E, 3 parts glycerin, 0.3 parts xanthan gum, 0.1 parts phenoxyethanol, 0.1 parts hydroxyethyl cellulose, and 76.2 parts deionized water.

[0068] The preparation method of this comparative example of a pure natural salt mud mask is as follows:

[0069] (1) Pretreatment of salt mud: Add appropriate water to the salt mud to make a slurry with good fluidity, and put it in a mixing container. Slowly add citric acid aqueous solution to it, stir evenly, adjust the pH of the system to 8, and stop stirring. Place the salt mud slurry with adjusted pH in a stainless steel pan, dry it at 90℃ for 12 h, then grind it and sieve it through a 100-mesh sieve to remove coarse particles and impurities, and collect salt mud powder with uniform particle size, which is the pretreated salt mud powder, for later use.

[0070] (2) Aqueous phase preparation: 76.2 parts of deionized water were injected into the stirred tank, and 1 part of seaweed extract, 0.3 parts of xanthan gum, 0.2 parts of asiaticoside and 0.1 parts of phenoxyethanol were added. The temperature was raised to 42°C and stirred at low speed (400 rpm) for 20 min until all components were completely dissolved to obtain a transparent aqueous phase.

[0071] (3) Homogenization and emulsification: Add the salt mud powder (18 parts) pretreated in step (1) to the transparent aqueous phase liquid obtained in step (2), heat to 42℃, homogenize at 2400 rpm for 8 min until the system is fine and uniform and without particles, and obtain the emulsified system.

[0072] (4) Low-temperature addition: Cool the emulsion system obtained in step (3) to room temperature, add 0.2 parts of vitamin E, and stir at low speed (500 rpm) for 8 min to mix evenly. Then, add glycerol pre-dispersed hydroxyethyl cellulose (3 parts of glycerol and 0.1 parts of hydroxyethyl cellulose), stir at 900 rpm for 20 min until the hydroxyethyl cellulose is completely swollen, and you will get a pure natural salt mud mask.

[0073] Comparative Example 3

[0074] This comparative example of a pure natural salt mud mask differs from Example 1 in that it does not contain seaweed extract. The ingredients, by weight, include: 18 parts salt mud, 1 part aloe vera extract, 0.2 parts asiaticoside, 0.2 parts vitamin E, 3 parts glycerin, 0.3 parts xanthan gum, 0.1 parts phenoxyethanol, 0.1 parts hydroxyethyl cellulose, and 76.2 parts deionized water.

[0075] The preparation method of this comparative example of a pure natural salt mud mask is as follows:

[0076] (1) Pretreatment of salt mud: Add appropriate water to the salt mud to make a slurry with good fluidity, and put it in a mixing container. Slowly add citric acid aqueous solution to it, stir evenly, adjust the pH of the system to 8, and stop stirring. Place the salt mud slurry with adjusted pH in a stainless steel pan, dry it at 90℃ for 12 h, then grind it and sieve it through a 100-mesh sieve to remove coarse particles and impurities, and collect salt mud powder with uniform particle size, which is the pretreated salt mud powder, for later use.

[0077] (2) Aqueous phase preparation: 76.2 parts of deionized water were injected into the stirred tank, and 1 part of aloe vera extract, 0.3 parts of xanthan gum, 0.2 parts of asiaticoside and 0.1 parts of phenoxyethanol were added. The temperature was raised to 42°C and stirred at low speed (400 rpm) for 20 min until all components were completely dissolved to obtain a transparent aqueous phase.

[0078] (3) Homogenization and emulsification: Add the salt mud powder (18 parts) pretreated in step (1) to the transparent aqueous phase liquid obtained in step (2), heat to 42℃, homogenize at 2400 rpm for 8 min until the system is fine and uniform and without particles, and obtain the emulsified system.

[0079] (4) Low-temperature addition: Cool the emulsion system obtained in step (3) to room temperature, add 0.2 parts of vitamin E, and stir at low speed (500 rpm) for 8 min to mix evenly. Then, add glycerol pre-dispersed hydroxyethyl cellulose (3 parts of glycerol and 0.1 parts of hydroxyethyl cellulose), stir at 1000 rpm for 20 min until the hydroxyethyl cellulose is completely swollen, and you will get a pure natural salt mud mask.

[0080] Comparative Example 4

[0081] This comparative example of a pure natural salt mud mask differs from Example 1 in that it does not contain centella asiatica extract. The ingredients, by weight, include: 18 parts salt mud, 1 part aloe vera extract, 1 part seaweed extract, 0.2 parts vitamin E, 3 parts glycerin, 0.3 parts xanthan gum, 0.1 part phenoxyethanol, 0.1 part hydroxyethyl cellulose, and 76.2 parts deionized water.

[0082] The preparation method of this comparative example of a pure natural salt mud mask is as follows:

[0083] (1) Pretreatment of salt mud: Add appropriate water to the salt mud to make a slurry with good fluidity, and put it in a mixing container. Slowly add citric acid aqueous solution to it, stir evenly, adjust the pH of the system to 8, and stop stirring. Place the salt mud slurry with adjusted pH in a stainless steel pan, dry it at 90℃ for 12 h, then grind it and sieve it through a 100-mesh sieve to remove coarse particles and impurities, and collect salt mud powder with uniform particle size, which is the pretreated salt mud powder, for later use.

[0084] (2) Aqueous phase preparation: 76.2 parts of deionized water were injected into the stirred tank, and 1 part of aloe vera extract, 1 part of seaweed extract, 0.3 parts of xanthan gum and 0.1 parts of phenoxyethanol were added. The temperature was raised to 42°C and stirred at low speed (500 rpm) for 20 min until all components were completely dissolved to obtain a transparent aqueous phase.

[0085] (3) Homogenization and emulsification: Add the salt mud powder (18 parts) pretreated in step (1) to the transparent aqueous phase liquid obtained in step (2), heat to 42℃, homogenize at 2400 rpm for 8 min until the system is fine and uniform and without particles, and obtain the emulsified system.

[0086] (4) Low-temperature addition: Cool the emulsion system obtained in step (3) to room temperature, add 0.2 parts of vitamin E, and stir at low speed (500 rpm) for 8 min to mix evenly. Then, add glycerol pre-dispersed hydroxyethyl cellulose (3 parts of glycerol and 0.1 parts of hydroxyethyl cellulose), stir at 1000 rpm for 20 min until the hydroxyethyl cellulose is completely swollen, and you will get a pure natural salt mud mask.

[0087] Implementation Results Example

[0088] Thirty-five volunteers (aged 18-55, male or female) were selected and divided into seven groups of five. Each group used the masks from Examples 1-3 and Comparative Examples 1-4 once a day for 15 minutes each time for four consecutive weeks. Changes in skin irritation, skin oil, and skin moisture content were then assessed.

[0089] (1) Skin irritation test

[0090] The salt mud masks prepared in Examples 1-3 and Comparative Examples 1-4 were tested. No cosmetics other than the test samples were used during the test. The skin was observed after the last use of the mask. According to the "Diagnostic Criteria and Treatment Principles for Cosmetic Contact Dermatitis", the classification criteria are shown in Table 1.

[0091] Table 1. Criteria for classifying skin irritation

[0092]

[0093] The specific results are shown in Table 2.

[0094] Table 2. Skin irritation test results after use in Examples 1-3 and Comparative Examples 1-4

[0095]

[0096] No irritation was observed in users of the masks in Examples 1-3 and Comparative Examples 2 and 3, with a score of 0 for all. Comparative Examples 1 and 4 received a score of 1, indicating that the absence of asiaticoside in the salt mud mask caused slight irritation. This result demonstrates a significant synergistic effect between asiaticoside and salt mud; they complement each other—the salt mud provides deep cleansing and mineral nourishment, while asiaticoside effectively soothes and repairs the skin barrier, reducing the risk of sensitivity, thus achieving a balance between efficacy and gentleness while ensuring cleansing power.

[0097] (2) Skin moisture, oil and elasticity test

[0098] Test samples: Examples 1-3 and Comparative Examples 2-3 were selected as test samples.

[0099] Test area: The test area is uniformly selected from both sides of the volunteer's cheeks.

[0100] Test time points and methods: before use, 0 min after washing off, 20 min after washing off, 40 min after washing off, and 60 min after washing off. The RBX-916 skin analyzer was used for testing.

[0101] This experiment included 25 volunteers aged 18-55, regardless of gender. After cleansing, volunteers applied a thick, even layer of the test mask (6.6 g) to their faces, left it on for 15 minutes, then scraped it off and rinsed with water. Skin moisture content, oil content, and elasticity were measured at these time points. Higher values ​​indicated better skin hydration, oil content, and elasticity. The average values ​​were taken as the final results, as shown in Table 3.

[0102] Table 3. Changes in skin moisture content before and after use in Examples 1-3, Comparative Examples 2-3, and commercially available competing products (specifically BUV Sea Salt Oil-Control and Smoothing Cleanser) (unit: %)

[0103]

[0104] As shown in Table 3, the skin moisture content of all samples was significantly increased after use compared to the initial state. Compared with Comparative Examples 2-3 and commercially available competing products, Examples 1-3 showed higher moisture content at the same test time points. This indicates that the mud-like mask of the present invention has a moisturizing effect.

[0105] Table 4. Changes in skin oil content before and after use in Examples 1-3, Comparative Examples 2-3, and commercially available competing products (specifically BUV Sea Salt Oil-Control and Smoothing Facial Cleanser) (Unit: %)

[0106]

[0107] As shown in Table 4, all groups of samples can effectively reduce skin oil levels; at the same test time point, compared with comparative examples 2 and 3 and commercially available competing products, the skin oil content was significantly reduced after using examples 1-3.

[0108] Based on the experimental results in Tables 3 and 4, it can be seen that the formula of this invention uses desalinated salt mud as the core, combined with natural active ingredients such as Centella asiatica extract, aloe vera extract, seaweed extract and vitamin E. The components work synergistically and complement each other to form a skin care system that integrates cleansing, soothing and moisturizing. It can effectively control oil and significantly improve skin hydration and improve the water-oil imbalance.

[0109] Table 5. Skin elasticity test results before and after use of Examples 1-3, Comparative Examples 2-3, and commercially available competing products (specifically BUV Sea Salt Oil Control and Smoothing Facial Cleanser) (unit: %)

[0110]

[0111] As shown in Table 5, compared with the initial value (before use), the skin elasticity index increased after using Examples 1-3, Comparative Examples 2 and 3, and commercially available competing products. At the same test time point, the skin elasticity index was higher after using Examples 1-3 compared with Comparative Examples 2 and 3 and commercially available competing products, indicating that the mask can significantly improve skin elasticity.

[0112] In summary, the experimental results demonstrate that the salt mud mask of this invention, while maintaining the nourishing properties of salt mud minerals, also has good skin affinity, increases skin moisture content, improves skin oil secretion, and has the effects of moisturizing, hydrating, and improving skin elasticity.

[0113] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pure natural salt mud mask with moisturizing and oil-controlling properties, characterized in that, The raw materials, by weight, include: 15-20 parts salt mud, 0.8-1.2 parts aloe vera extract, 0.8-1.2 parts seaweed extract, 0.1-0.3 parts asiaticoside, 0.1-0.3 parts vitamin E, 2.5-3.5 parts glycerin, 0.2-0.4 parts xanthan gum, 0.08-0.12 parts phenoxyethanol, 0.1-0.12 parts hydroxyethyl cellulose, and 70-80 parts deionized water.

2. The all-natural salt mud mask with moisturizing and oil-controlling properties according to claim 1, characterized in that, The salt mud is well mine salt mud.

3. The all-natural salt mud mask with moisturizing and oil-controlling properties according to claim 2, characterized in that, The salt mud is pretreated salt mud powder with a pH of 7-8.

4. The all-natural salt mud mask with moisturizing and oil-controlling properties according to claim 3, characterized in that, The particle size of the salt mud powder is ≤150 μm.

5. The all-natural salt mud mask with moisturizing and oil-controlling properties according to claim 4, characterized in that, The pretreatment refers to the salt mud being subjected to a series of processes, including pH adjustment with acid, drying, grinding, and sieving.

6. The method for preparing the all-natural salt mud mask with moisturizing and oil-controlling properties as described in claim 1, characterized in that, The steps are as follows: (1) Weigh the salt mud and pre-treat it by adding acid to adjust the pH, drying, grinding and sieving to obtain pre-treated salt mud; (2) Add aloe vera extract, seaweed extract, xanthan gum, asiaticoside and phenoxyethanol to deionized water, heat and stir until completely dissolved to obtain a transparent aqueous phase; (3) Add the pretreated salt mud from step (1) to the transparent aqueous phase liquid obtained in step (2) and perform homogenization and emulsification to obtain an emulsion system; (4) Cool the emulsion system obtained in step (3) to room temperature, add vitamin E and mix evenly; then add glycerin to pre-disperse hydroxyethyl cellulose and stir until the hydroxyethyl cellulose is completely swollen to obtain a pure natural salt mud mask.

7. The method for preparing a pure natural salt mud mask with moisturizing and oil-controlling properties according to claim 6, characterized in that, In step (1), the drying temperature is 80-90℃ and the time is 12 h.

8. The method for preparing a pure natural salt mud mask with moisturizing and oil-controlling properties according to claim 7, characterized in that, In step (1), sieving refers to passing through a sieve with a mesh size of 100-200.

9. The method for preparing a pure natural salt mud mask with moisturizing and oil-controlling properties according to claim 6, characterized in that, In step (2), the heating and stirring temperature is 40-45℃ and the time is 15-20 min.

10. The method for preparing a pure natural salt mud mask with moisturizing and oil-controlling properties according to claim 6, characterized in that, In step (3), the homogenization emulsification temperature is 40-45℃, the homogenization speed is 2000-3000 rpm, and the time is 8-12 min.

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