Preparation method of traditional Chinese medicine abelmoschus manihot extracted essential oil skincare bath foam

Abstract

The invention discloses a preparation method of traditional Chinese medicine abelmoschus manihot extracted essential oil skincare bath foam, and relates to the technical field of daily chemical products, and the preparation method comprises the following steps: (1) raw material compatibility: taking 10-30 parts by mass of abelmoschus manihot essential oil, 15-40 parts by mass of olive oil, 10-25 parts by mass of camellia oil, 5-15 parts by mass of lily flower essential oil, 3-12 parts by mass of peppermint oil and 5-20 parts by mass of wild honey; according to the invention, a complete cleaning-care-modification system is constructed. Besides core functional components, a scientific pharmaceutic adjuvant system not only provides necessary cleaning, foaming, thickening and shaping functions, but also further reduces the potential irritation of the product to sensitive skin by adding dipotassium glycyrrhizinate, bisabolol and other skin soothing agents which are in synergistic interaction with the abelmoschus manihot essential oil. Due to the addition of humectants such as sodium hyaluronate and the like, water loss possibly caused in the cleaning process is made up, and the skin moistening effect that the skin is not dry after being washed is achieved. The essence and the coloring agent are accurately added in a trace manner, so that the sensory quality of the product is improved, and market diversification requirements are met.

Description

Technical Field

[0001] This invention relates to the field of daily chemical products technology, specifically a method for preparing a skin care bath liquid made from the essential oil extracted from the traditional Chinese medicine sunflower. Background Technology

[0002] As an essential daily personal hygiene product, shower gel's function has expanded from basic cleansing to include multiple benefits such as soothing, moisturizing, and skincare. Commercially available shower gel products can be mainly categorized as follows: 1) Strong cleansing products primarily using synthetic surfactants, which may cause dry and tight skin with prolonged use; 2) Conceptual products containing small amounts of plant extracts, but with low concentrations of effective ingredients and limited efficacy; 3) Gentle products designed for sensitive skin, but often lacking in cleansing power or user experience.

[0003] Golden hibiscus is a plant used in both medicine and food. Its extract is rich in flavonoids, which have anti-inflammatory, antioxidant, and skin-soothing effects. However, directly applying golden hibiscus extract to bath products presents the following technical challenges: 1) Water-soluble extracts have poor stability in oil-water systems and are prone to separation or loss of efficacy; 2) Untreated extracts may contain impurities, affecting the product's appearance and feel; 3) Single plant ingredients have limited efficacy and cannot meet consumers' expectations for multifunctional bath products (such as immediate cooling and long-lasting moisturizing).

[0004] Furthermore, existing shower gel products often rely on single chemical cooling agents such as menthol for their cooling and itch-relieving effects, which have short-lived effects and may irritate the skin. For moisturizing, they mostly rely on synthetic esters added later, which have poor skin affinity. Therefore, developing a shower gel product based on a natural plant essential oil complex system, achieving stable emulsification through scientific formulation and processing, and combining immediate cooling with long-lasting moisturizing effects, has significant market value. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a method for preparing a skincare bath liquid made from the essential oil extracted from the Chinese herbal medicine *Hippophae rhamnoides*. This method solves the following technical difficulties associated with directly applying *Hippophae rhamnoides* extract to bath liquids: 1) Water-soluble extracts have poor stability in oil-water systems, easily leading to stratification or inactivation; 2) Untreated extracts may contain impurities, affecting the product's appearance and skin feel; 3) The efficacy of single plant ingredients is limited, making it difficult to meet consumers' expectations for multifunctional bath products (such as immediate cooling and long-lasting moisturizing). Existing bath liquid products often rely on single chemical cooling agents such as menthol for cooling and relieving itching, which have short-lived effects and may irritate the skin; for moisturizing, they often rely on synthetic esters added later, which have poor skin affinity.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for preparing a skin care bath liquid made from the essential oil extracted from the traditional Chinese medicine *Hippophae rhamnoides*, comprising the following steps: (1) Ingredient formulation: Take 10-30 parts of golden sunflower essential oil, 15-40 parts of olive oil, 10-25 parts of camellia oil, 5-15 parts of lily essential oil, 3-12 parts of peppermint oil, and 5-20 parts of wild honey by weight. (2) Mixing and heat treatment: Mix the golden sunflower essential oil, olive oil, camellia oil, lily essential oil and peppermint oil and stir evenly, then heat to 75-85℃ and maintain the temperature for 5-15 minutes; (3) Cooling and filtration: Cool the heat-treated mixed oil to 30-45℃ and filter it through a 100-300 mesh sieve to obtain a clear mixed essential oil; (4) Addition of excipients and emulsification: Add raw honey to the clarified mixed essential oil and add a pharmaceutical excipient system, and emulsify at 40-60℃ and 300-600rpm to form a homogeneous emulsion; (5) Finished product filling: The emulsified bath liquid is filled and sealed in 150-200ml / bottle specifications.

[0007] Preferably, the mass fractions of the raw materials in step (1) are: 15-25 parts of golden sunflower essential oil, 20-35 parts of olive oil, 15-20 parts of camellia oil, 8-12 parts of lily essential oil, 5-10 parts of peppermint oil, and 8-15 parts of wild honey.

[0008] Preferably, the pharmaceutical excipient system comprises the following components in parts by weight: Surfactant: Sodium lauryl ether sulfate 8-20 parts, cocamidopropyl betaine 5-12 parts; Thickener: 1-5 parts sodium chloride, 0.2-1.5 parts carbomer; Moisturizers: 3-10 parts glycerin, 2-6 parts propylene glycol, 0.05-0.3 parts sodium hyaluronate; Preservatives: 0.3-1.0 parts phenoxyethanol, 0.1-0.5 parts methylparaben; Antioxidants: Vitamin E 0.1-0.8 parts, tert-butylhydroxyanisole 0.01-0.1 parts; pH adjuster: 0.1-0.8 parts citric acid or 0.2-1.0 parts sodium citrate; Fragrance: 0.1-2 parts or colorant: 0.001-0.1 parts.

[0009] Preferably, the specific process of heat treatment in step (2) is as follows: the mixed oil is placed in a water bath and heated to 80°C at a rate of 1-2°C / minute, and kept at 80±2°C for 8-12 minutes.

[0010] Preferably, the filtration in step (3) adopts a multi-stage gradient filtration process: first, it is pre-filtered through a 150-mesh stainless steel filter screen, and then finely filtered through a 0.45μm microporous filter membrane.

[0011] Preferably, the pharmaceutical excipient system further includes a skin soothing agent composed of 0.1-0.5 parts of dipotassium glycyrrhizate and 0.05-0.3 parts of bisabolol.

[0012] Preferably, the emulsification in step (4) is a stepwise emulsification process: first, add surfactant and half of the water phase, and emulsify at high speed at 50-55°C for 5-10 minutes; then add the remaining water phase, humectant and other excipients, and mix at low speed at 45-50°C for 15-25 minutes.

[0013] Preferably, before filling in step (5), the bath liquid is cooled to 25-30°C and the final pH value is adjusted to 5.5-6.5. Beneficial effects

[0014] This invention provides a method for preparing a skincare bath liquid made from the essential oil extracted from the Chinese herbal medicine *Hippophae rhamnoides*. The *Hippophae rhamnoides* essential oil provides a base for soothing and anti-inflammatory effects; olive oil and camellia oil, as high-quality light oils, synergistically enhance moisturizing and skin barrier repair; lily essential oil provides an elegant fragrance and assists in soothing; peppermint oil provides an immediate cooling sensation. In particular, through a specific ratio and heat treatment process, the cooling and stimulating properties of peppermint oil are optimally balanced with the soothing properties of other essential oils, avoiding the sharp cooling sensation and potential irritation of menthol alone, creating a gentle, long-lasting, and comfortable cooling experience, and synergistically enhancing the antipruritic effect. The precisely temperature-controlled heat treatment step (75-85℃, 5-15 minutes) is one of the key process steps of this invention. This condition is sufficient to promote the mutual penetration and homogenization of essential oil components of different polarities and molecular weights, and to cause some sugars in the honey and components such as phytosterols to undergo weak Maillard-like reactions or complex effects, significantly improving the stability of the entire oil-phase mixture system, making it less prone to separation during the later emulsification process, and extending the product's shelf life. This process differs from... Conventional room-temperature mixing or high-temperature long-term boiling achieves an optimal balance between activity and stability. This invention constructs a complete "cleansing-care-modification" system. In addition to the core active ingredients, the scientific pharmaceutical excipient system not only provides the necessary cleansing, foaming, thickening, and shaping functions, but also further reduces the potential irritation to sensitive skin by adding skin soothing agents such as dipotassium glycyrrhizate and bisabolol, which synergistically enhance the effects with golden sunflower essential oil. The addition of moisturizers such as sodium hyaluronate compensates for the moisture loss that may occur during the cleansing process, achieving a "non-drying" moisturizing effect after washing. The precise addition of trace amounts of fragrance and colorant enhances the sensory quality of the product and meets the diverse needs of the market. The main active ingredients are derived from natural plant extracts and wild honey, reducing the reliance on chemically synthesized ingredients. The entire formula system has a weakly acidic pH value, close to the pH value of healthy skin, making it gentle and non-greasy. The preparation process steps are clear, and the parameters are well-defined (such as temperature, time, stirring speed, filtration accuracy, etc.), making it easy to achieve standardization and large-scale production, and ensuring stable and uniform product quality. Detailed Implementation

[0015] The present invention will be further described in detail below through specific embodiments. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0016] Example 1: A method for preparing a skin care bath liquid made from the essential oil extracted from the Chinese herb *Hippophae rhamnoides*, comprising the following steps: (1) Raw material preparation (based on a total of 1000 finished products): Golden sunflower essential oil: 20 parts Olive oil: 25 parts Camellia oil: 18 parts Lily flower essential oil: 10 parts Peppermint oil: 8 parts Wild honey: 12 portions Pharmaceutical excipients: 15 parts sodium lauryl ether sulfate, 8 parts cocamidopropyl betaine, 3 parts sodium chloride, 0.8 parts carbomer, 6 parts glycerin, 4 parts propylene glycol, 0.15 parts sodium hyaluronate, 0.6 parts phenoxyethanol, 0.3 parts methylparaben, 0.5 parts vitamin E, 0.05 parts tert-butylhydroxyanisole, 0.4 parts citric acid, 0.3 parts dipotassium glycyrrhizate, 0.15 parts bisabolol, 1.0 part natural plant fragrance, and water as needed to 1000 parts.

[0017] (2) Mixing and heat treatment: Add the five essential oils to the reaction vessel and mix by stirring at 300 rpm for 20 minutes. Heat in a water bath at a rate of 1.5℃ / min to 80℃, and maintain the temperature at 80±1℃ for 10 minutes.

[0018] (3) Cooling and filtration: The mixture was naturally cooled to 40°C and then filtered through a 180-mesh stainless steel mesh and a 0.45μm PES filter membrane to obtain a clear blend of essential oils.

[0019] (4) Emulsification: Aqueous phase: Take about 650 parts of deionized water, heat to 72°C, add glycerol, propylene glycol, and carbomer pre-dissolved slurry (carbomer is pre-dispersed in a small amount of water), and stir to dissolve.

[0020] Oil phase: Mix the essential oils, honey, two surfactants, and vitamin E thoroughly at 52°C.

[0021] The aqueous phase is slowly added to the oil phase while stirring at 50°C and 400 rpm. After the addition is complete, the speed is increased to 1200 rpm for high-speed shear emulsification for 8 minutes.

[0022] Cool to 48°C, add dissolved sodium hyaluronate, dipotassium glycyrrhizate, bisabolol, preservatives, flavoring, and a small amount of citric acid solution dissolved in water, and stir at 300 rpm for 20 minutes. Homogenize (20 MPa, once) and degas under vacuum.

[0023] (5) Filling: After cooling to 28°C, the pH value was measured to be 6.0. It was then filled into 180ml PET plastic bottles. Example

[0024] A method for preparing a skin care bath liquid made from the essential oil extracted from the Chinese herb *Hippophae rhamnoides* includes the following steps: (1) Raw material preparation (based on a total of 1000 finished products): Golden sunflower essential oil: 25 parts Olive oil: 25 parts Camellia oil: 18 parts Lily flower essential oil: 10 parts Peppermint oil: 5 parts Wild honey: 15 portions Pharmaceutical excipients: 12 parts sodium lauryl ether sulfate, 10 parts cocamidopropyl betaine, 3 parts sodium chloride, 0.8 parts carbomer, 6 parts glycerin, 4 parts propylene glycol, 0.15 parts sodium hyaluronate, 0.6 parts phenoxyethanol, 0.3 parts methylparaben, 0.5 parts vitamin E, 0.05 parts tert-butylhydroxyanisole, 0.4 parts citric acid, 0.3 parts dipotassium glycyrrhizate, 0.15 parts bisabolol, 1.0 part natural plant fragrance, 0.03 parts coloring agent (natural gardenia yellow), and water as needed to 1000 parts.

[0025] (2) Mixing and heat treatment: Five kinds of essential oils were added to the reaction vessel and stirred at 300 rpm for 20 minutes to mix. The mixture was then heated in a water bath at a rate of 1.5℃ / min to 78℃ and held at 78℃ for 12 minutes.

[0026] (3) Cooling and filtration: The mixture was naturally cooled to 40°C and then filtered through a 180-mesh stainless steel mesh and a 0.45μm PES filter membrane to obtain a clear blend of essential oils.

[0027] (4) Emulsification: Aqueous phase: Take about 650 parts of deionized water, heat to 70°C, add glycerol, propylene glycol, and carbomer pre-dissolved slurry (carbomer is pre-dispersed in a small amount of water), and stir to dissolve.

[0028] Oil phase: Mix the essential oils, honey, two surfactants, and vitamin E thoroughly at 52°C.

[0029] The aqueous phase is slowly added to the oil phase while stirring at 50°C and 400 rpm. After the addition is complete, the speed is increased to 1200 rpm for high-speed shear emulsification for 8 minutes.

[0030] Cool to 48°C, add dissolved sodium hyaluronate, dipotassium glycyrrhizate, bisabolol, preservatives, flavoring, and a small amount of citric acid solution dissolved in water, and stir at 300 rpm for 20 minutes. Homogenize (20 MPa, once) and degas under vacuum.

[0031] (5) Filling: After cooling to 28°C, the pH value was measured to be 6.0. It was then filled into 180ml PET plastic bottles.

[0032] Comparative Example 1 No heat treatment: The formula and steps of Example 1 are followed, but in step (2), the five essential oils are mixed and stirred at 45°C for 20 minutes without heat treatment at 75-85°C, and directly enter the cooling and filtration step.

[0033] Comparative Example 2 Commonly available shower gels: A cooling and moisturizing shower gel from a certain international brand.

[0034] Product stability testing (accelerated test at 40℃ for 3 months) Efficacy evaluation (30 volunteers, once daily for 4 weeks) Testing method: Different products were applied to designated areas on the backs of volunteers. Scores were obtained using instruments and questionnaires before use, 30 minutes after use, and 4 weeks later. Mildness test (chicken embryo chorioallantoic membrane test, to assess irritation). This invention, through the formulation of specific functional essential oil compositions, key precise heat treatment processes, and the construction of a scientific complete formula system, successfully prepared a skin-care bath liquid with high stability, a long-lasting and comfortable cooling sensation, and significant anti-itch and moisturizing effects. Examples show that the product of this invention is superior to traditionally processed products and similar commercially available products in terms of stability, core efficacy experience (the balance between cooling and anti-itch effects), and long-term skin-care effects. It achieves an organic combination of cleansing, care, and sensory experience, and has promising market application prospects.

[0035] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

Claims

1. A method for preparing a skin care bath liquid made from the essential oil extracted from the Chinese herb *Hippophae rhamnoides*, characterized in that, Includes the following steps: (1) Ingredient formulation: Take 10-30 parts of golden sunflower essential oil, 15-40 parts of olive oil, 10-25 parts of camellia oil, 5-15 parts of lily essential oil, 3-12 parts of peppermint oil, and 5-20 parts of wild honey by weight. (2) Mixing and heat treatment: Mix the golden sunflower essential oil, olive oil, camellia oil, lily essential oil and peppermint oil and stir evenly, then heat to 75-85℃ and maintain the temperature for 5-15 minutes; (3) Cooling and filtration: Cool the heat-treated mixed oil to 30-45℃ and filter it through a 100-300 mesh sieve to obtain a clear mixed essential oil; (4) Addition of excipients and emulsification: Add raw honey to the clarified mixed essential oil and add a pharmaceutical excipient system, and emulsify at 40-60℃ and 300-600rpm to form a homogeneous emulsion; (5) Finished product filling: The emulsified bath liquid is filled and sealed in 150-200ml / bottle specifications.

2. The method for preparing a skin care bath liquid extracted from the herb *Hippophae rhamnoides* according to claim 1, characterized in that, The mass fractions of the raw materials mentioned in step (1) are: 15-25 parts of golden sunflower essential oil, 20-35 parts of olive oil, 15-20 parts of camellia oil, 8-12 parts of lily essential oil, 5-10 parts of peppermint oil, and 8-15 parts of wild honey.

3. The method for preparing a skin care bath liquid extracted from the herb *Hippophae rhamnoides* according to claim 1, characterized in that, The pharmaceutical excipient system comprises the following components in parts by weight: Surfactant: Sodium lauryl ether sulfate 8-20 parts, cocamidopropyl betaine 5-12 parts; Thickener: 1-5 parts sodium chloride, 0.2-1.5 parts carbomer; Moisturizers: 3-10 parts glycerin, 2-6 parts propylene glycol, 0.05-0.3 parts sodium hyaluronate; Preservatives: 0.3-1.0 parts phenoxyethanol, 0.1-0.5 parts methylparaben; Antioxidants: Vitamin E 0.1-0.8 parts, tert-butylhydroxyanisole 0.01-0.1 parts; pH adjuster: 0.1-0.8 parts citric acid or 0.2-1.0 parts sodium citrate; Fragrance: 0.1-2 parts, and / or colorant: 0.001-0.1 parts.

4. The method for preparing a skin care bath liquid extracted from the herb *Hippophae rhamnoides* according to claim 1, characterized in that, The specific process of heat treatment in step (2) is as follows: place the mixed oil in a water bath, heat it to 80°C at a rate of 1-2°C / minute, and keep it at 80±2°C for 8-12 minutes.

5. The method for preparing a skin care bath liquid extracted from the herb *Hippophae rhamnoides* according to claim 1, characterized in that, The filtration process described in step (3) is a multi-stage gradient filtration process: first, it is pre-filtered through a 150-mesh stainless steel filter screen, and then finely filtered through a 0.45μm microporous membrane.

6. The method for preparing a skin care bath liquid extracted from the herb *Hippophae rhamnoides* according to claim 1, characterized in that, The pharmaceutical excipient system also includes a skin soothing agent, which consists of 0.1-0.5 parts of dipotassium glycyrrhizate and 0.05-0.3 parts of bisabolol.

7. The method for preparing a skin care bath liquid extracted from the herb *Hippophae rhamnoides* according to claim 1, characterized in that, The emulsification described in step (4) is a stepwise emulsification process: first, add the surfactant and half of the aqueous phase, and emulsify at high speed at 50-55℃ for 5-10 minutes; then add the remaining aqueous phase, humectant and other excipients, and mix at low speed at 45-50℃ for 15-25 minutes.

8. The method for preparing a skin care bath liquid extracted from the herb *Hippophae rhamnoides* according to claim 1, characterized in that, Before filling as described in step (5), the bath liquid is cooled to 25-30°C and the final pH value is adjusted to 5.5-6.5.