Herbal bath foam for conditioning and nano-packaging preparation process thereof

Abstract

The invention provides a herbal bath foam for conditioning and a nano-packaging preparation process thereof, and aims to exert the conditioning effect of herbaceous plants and essential oil by improving the skin absorption efficiency. The herbal bath foam is composed of herbal components and essential oil components, the herbal components comprise herba houttuyniae, honeysuckle flowers, rhizoma atractylodis macrocephalae, radix aucklandiae, cortex eucommiae and the like, and the essential oil components comprise lavender oil, chamomile oil, rosemary oil and the like. Through the nano packaging technology, the synergistic effect of the herbal components and the essential oil and the optimized preparation technology, the skin absorption rate of the herbal components can be effectively increased, improvement of skin health and body conditioning are helped, meanwhile, the preparation technology of the bubble bath liquid ensures the stability of the essential oil through the technologies of high-pressure homogenization, ultrasonic emulsification and the like, and the skin care effect is improved. The problems of volatilization and oxidation are avoided. The bath foam prepared by the invention has the effects of safety, stability, conditioning, moisturizing and the like, and is widely applicable to daily skin care, body and mind relaxation and body state regulation.

Description

Technical Field

[0001] The present invention relates to the technical field of daily necessities, and particularly to a conditioning herbal bath liquid and its nano-encapsulation preparation process. Background Art

[0002] As a popular personal care product, herbal bath liquid has been widely used in the fields of skin care and body conditioning. The basic function of the bath liquid is to help relax the body and mind, moisturize the skin, and relieve stress through the action of water-soluble herbal extracts and active ingredients such as essential oils. With the increasing attention of consumers to health and natural ingredients, more and more bath liquid products begin to use herbal extracts, such as honeysuckle, houttuynia cordata, and atractylodes macrocephala, to help clear heat and detoxify, reduce inflammation and soothe, and improve skin health. However, although these herbal ingredients have significant conditioning effects, how to effectively improve their absorption efficiency on the skin and thus play a better health conditioning role is still a challenge in product research and development.

[0003] Currently, there are many bath liquid products containing herbal ingredients on the market. These products mainly use herbal extracts or essential oils to help soothe and condition the skin. These herbal plants include honeysuckle, sophora flavescens, atractylodes macrocephala, and costus root, etc., all of which have the effects of anti-inflammation, antibacterial, and promoting blood circulation. In the prior art, the preparation process of bath liquid mainly uses traditional methods such as water extraction, alcohol extraction, or steam distillation to extract herbal ingredients. With the progress of technology, some products begin to use nano-encapsulation technology to enhance the permeability and absorption effect of herbal ingredients, which enables the herbal ingredients to penetrate deeper into the skin layer and play a role. In addition, the addition of essential oil components also helps to enhance the skin absorption effect and improve the use effect of the bath liquid.

[0004] Although the prior art has made some progress in the research and application of herbal bath liquid, there are still some obvious deficiencies. First of all, most of the existing bath liquid products adopt traditional extraction methods, resulting in limited absorption effect of herbal ingredients. The active ingredients in traditional herbal extracts are often difficult to deeply penetrate through the skin barrier. Therefore, although the bath liquid can provide a certain soothing effect, the overall curative effect is limited. Secondly, even though active ingredients such as essential oils are used to promote skin absorption, the dispersion of these essential oils in traditional bath liquids is poor and they are easy to volatilize, resulting in poor stability of the ingredients and short-lasting use effect. In addition, the problems of oxidation and stratification of essential oils still exist, affecting the quality and shelf life of the bath liquid. These problems in the prior art limit the application effect of herbal bath liquid and cannot meet the needs of consumers for efficient, long-lasting, and stable conditioning effects.

[0005] In view of the deficiencies in the prior art, it is necessary to provide a conditioning herbal bath liquid and its preparation process to solve the above problems. Summary of the Invention

[0006] According to the above-mentioned technical problems, a herbal bath liquid for conditioning and its nano-encapsulation preparation process are provided to improve the skin absorption efficiency and enhance the conditioning effect of the bath liquid. By optimizing the ratio of herbal plant components, the present invention uses modern nano-encapsulation technology to wrap the herbal components and essential oils in nanoparticles, forming a composite system that is more easily absorbed by the skin. The nano-encapsulation technology can effectively enhance the permeability of the herbal components, ensure their rapid absorption through the skin barrier, and exert a better conditioning effect. In addition, the stability of the essential oils is improved, avoiding the problems of volatilization and oxidation, and ensuring the long-term stability and use effect of the product. The present invention can significantly enhance the overall effect of the bath liquid and has broad application prospects, especially in improving skin health and body conditioning.

[0007] The technical means adopted by the present invention are as follows:

[0008] A herbal bath liquid for conditioning, which is prepared by mixing a bath liquid base with deionized water or purified water in a ratio of 1:1 to 1:10. Among them, the bath liquid base includes herbal components and essential oil components. The herbal components are extracted from Houttuynia cordata, Fritillaria thunbergii, Lonicera japonica, Atractylodes macrocephala, Aucklandia lappa, Polygala tenuifolia, Eucommia ulmoides, Rehmannia glutinosa, Pogostemon cablin, Sophora flavescens, Schizonepeta tenuifolia, and Isatis indigotica according to preset weight portions; the essential oil components are composed of one or several of lavender oil, chamomile oil, rosemary oil, tea tree oil, perilla leaf oil, pogostemon oil, and ginger oil.

[0009] Furthermore, the herbal components are composed of the following components in weight portions: 5-15 parts of Houttuynia cordata; 3-8 parts of Fritillaria thunbergii; 5-10 parts of Lonicera japonica; 4-8 parts of Atractylodes macrocephala; 2-5 parts of Aucklandia lappa; 3-6 parts of Polygala tenuifolia; 3-6 parts of Eucommia ulmoides; 4-8 parts of Rehmannia glutinosa; 2-5 parts of Pogostemon cablin; 5-10 parts of Sophora flavescens; 3-5 parts of Schizonepeta tenuifolia; 3-6 parts of Isatis indigotica.

[0010] Furthermore, the weight portion of the essential oil components is 0.5-3 parts, including 0.1-0.5 parts of lavender oil, 0.1-0.3 parts of chamomile oil, 0.05-0.2 parts of rosemary oil, 0.05-0.2 parts of tea tree oil, 0.1-0.3 parts of perilla leaf oil, 0.05-0.15 parts of pogostemon oil, and 0.05-0.15 parts of ginger oil.

[0011] Furthermore, the bath liquid base also includes a non-ionic emulsifier, and the emulsifier is selected from hydrogenated castor oil PEG-40 or CO40, and its weight portion is 0.5-2 parts.

[0012] Furthermore, the pH value of the bath liquid is 5.0-6.5.

[0013] The present invention also discloses a nano-encapsulation preparation process for the above-mentioned herbal bath liquid for conditioning, comprising the following steps:

[0014] Step 1, pretreatment of herbal components: Mix houttuynia cordata, fritillaria thunbergii, honeysuckle, atractylodes macrocephala, costus root, polygala tenuifolia, eucommia ulmoides, rehmannia glutinosa, pogostemon cablin, sophora flavescens, schizonepeta tenuifolia, and baphicacanthus cusia in preset weight portions, wash them clean and dry them at 50-70 °C until the moisture content is less than 10%.

[0015] Step 2, preparation of herbal extract: After pulverizing the dried herbal raw materials to 80-120 meshes, adopt water extraction or alcohol extraction methods to obtain a herbal plant extract, filter and concentrate it to obtain the required herbal extract.

[0016] Step 3, essential oil treatment: Mix one or several of lavender oil, chamomile oil, rosemary oil, tea tree oil, perilla leaf oil, pogostemon oil, and ginger oil in a preset ratio, and slowly heat it below 40 °C, stir evenly, and keep the temperature not exceeding the degradation point of the active ingredients of the essential oil.

[0017] Step 4, preliminary emulsification: Mix the essential oil and the emulsifier in a ratio of 1:1 to 1:3, use a magnetic stirrer or a high-speed shear emulsifier to stir, the shear speed is 3000-6000 rpm, and the duration is 5-10 minutes to ensure that the essential oil is evenly dispersed to form a stable emulsion.

[0018] Step 5, nano-encapsulation treatment: Use the high-pressure homogenization method or the ultrasonic emulsification method to carry out nano-sizing treatment of the essential oil, homogenize the preliminarily emulsified mixture, gradually increase the pressure in stages, the treatment time is 5-10 minutes, and the essential oil particles are refined to 50-200 nm.

[0019] Step 6, stability test: Adopt centrifugal test or accelerated aging test to test whether the bath liquid is stratified or precipitated, and adjust the emulsifier ratio or homogenization treatment parameters according to the test results.

[0020] Step 7, finished product packaging: Package the bath liquid qualified through the stability test in a light-proof and nitrogen-filled manner, and store it in a cool and dry place.

[0021] Further, in the step 2, the concentration method of the herbal extract adopts evaporation concentration or membrane separation technology to concentrate the herbal extract to the required concentration.

[0022] Further, the high-pressure homogenization method in the step 5 is to pass the preliminarily emulsified mixture through a high-pressure homogenizer, the homogenization pressure is 500-1500 bar, and the homogenization treatment is repeated 3-5 times to ensure the nano-scale dispersion of the essential oil particles.

[0023] Further, the ultrasonic emulsification method in step 5 uses an ultrasonic emulsifier, sets the frequency to 20 - 30 kHz, pulse mode, the treatment time is 5 - 10 minutes, and controls the temperature not to exceed 40°C to avoid high temperature from damaging the active ingredients of the essential oil.

[0024] Further, the stability test in step 6 includes centrifugation test, accelerated aging test, and layering test to ensure that the prepared bath liquid will not stratify or precipitate during storage, and the shelf life reaches more than 6 months.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] 1. By combining various herbal plant ingredients with essential oil ingredients, the present invention gives play to the synergistic effect of herbal plants and essential oils. Herbal plants such as Houttuynia cordata, Lonicera japonica, and Atractylodes macrocephala have unique advantages in conditioning the skin, anti - inflammation, and anti - bacteria, while essential oil ingredients such as lavender oil, chamomile oil, and rosemary oil have the effects of soothing and relaxing the body and mind. The present invention uses natural herbal plant extracts and essential oil ingredients, avoiding the use of chemical components, and ensuring the mildness and safety of the bath liquid to the skin. By optimizing the ratio of herbal plant extracts and the selection of essential oils, the two cooperate with each other, and can gently condition the skin during bathing, improve skin health in many aspects, provide comprehensive care effects, and are particularly outstanding in conditioning the body.

[0027] 2. By adopting the nano - encapsulation technology, the present invention encapsulates the herbal ingredients and essential oil ingredients in nanoparticles, thus significantly improving the skin penetration rate of the herbal ingredients and essential oils. Compared with the larger - molecule active ingredients in traditional bath liquids, the nano - level encapsulation enables these ingredients to more effectively penetrate the skin barrier and quickly enter the deep layer of the skin, thereby significantly improving their conditioning effects. In this way, the functions of herbal plant extracts and essential oils are maximally exerted, enhancing the overall effect of the bath liquid.

[0028] 3. The present invention adopts advanced technologies such as high - pressure homogenization and ultrasonic emulsification to evenly disperse the essential oil ingredients in the bath liquid and keep them within the nano - scale range. Through the nano - encapsulation technology, the essential oil particles are effectively protected, avoiding the problems of volatilization, oxidation, and stratification of the essential oil ingredients in traditional bath liquids, thereby improving the stability and persistence of the essential oil.

[0029] In summary, through the nano - encapsulation technology, the synergistic effect of herbal ingredients and essential oils, and the optimized preparation process, the present invention significantly improves the effect and stability of the bath liquid, provides a highly efficient, safe, and herbal bath liquid for conditioning suitable for a wide range of people, and has broad market application prospects. Detailed implementation mode

[0030] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] Embodiment 1

[0032] The present invention provides a herbal bath liquid for conditioning. The herbal components of the bath liquid base include 10 parts of Houttuynia cordata, 6 parts of Fritillaria thunbergii, 8 parts of Lonicera japonica, 5 parts of Atractylodes macrocephala, 3 parts of Aucklandia lappa, 4 parts of Polygala tenuifolia, 5 parts of Eucommia ulmoides, 7 parts of Rehmannia glutinosa, 3 parts of Pogostemon cablin, 6 parts of Sophora flavescens, 4 parts of Schizonepeta tenuifolia, and 5 parts of Isatis tinctoria; 1.3 parts of essential oil components, including 0.5 part of lavender oil, 0.3 part of chamomile oil, 0.2 part of rosemary oil, 0.2 part of tea tree oil, and 0.1 part of patchouli oil; the ratio of the above bath liquid base to deionized water is 1:10, and the pH value is 6.0.

[0033] It is prepared according to the following method:

[0034] Step 1, pretreatment of herbal components: Mix according to the above weight parts of herbal components, wash them clean and dry them at 50 - 70 °C until the moisture content is less than 10%;

[0035] Step 2, preparation of herbal extract: After crushing the dried herbal raw materials to 80 - 120 meshes, add them to an extraction tank, add deionized water, and soak according to 6 times the weight of water. Heat and extract at 60 - 80 °C for 1 - 3 hours, and filter to obtain the herbal extract.

[0036] Step 3, essential oil treatment: Mix 0.5 part of lavender oil, 0.3 part of chamomile oil, 0.2 part of rosemary oil, 0.2 part of tea tree oil, and 0.1 part of patchouli oil, and slowly heat at below 40 °C, stir evenly, and keep the temperature not exceeding the degradation point of the essential oil active ingredients;

[0037] Step 4, preliminary emulsification: Mix the essential oil and the emulsifier in a ratio of 1:2, and use a magnetic stirrer or a high-speed shear emulsifier to stir, with a shear speed of 3000 - 6000 rpm and a duration of 5 - 10 minutes to ensure that the essential oil is evenly dispersed to form a stable emulsion;

[0038] Step 5, nano-encapsulation treatment: Use the high-pressure homogenization method for nano-sizing the essential oil, with a homogenization pressure of 500 - 1500 bar, repeat the homogenization treatment 3 - 5 times, increase the pressure in stages, and the treatment time is 5 - 10 minutes to refine the essential oil particles to 50 - 200 nm; ensure the nano-scale dispersion of the essential oil particles.

[0039] Step 6, Stability test, using centrifugation test or accelerated aging test, including centrifugation test, accelerated aging test and delamination test. Adjust the emulsifier ratio or homogenization treatment parameters according to the test results to ensure that the prepared bath liquid will not delaminate or precipitate during storage, and the shelf life reaches more than 6 months;

[0040] Step 7, Finished product packaging. Package the bath liquid qualified in the stability test in a light-proof and nitrogen-filled manner and store it in a cool and dry place.

[0041] Example 2

[0042] Based on Example 1, the formula of the herbal ingredients is: 12 parts of Houttuynia cordata, 7 parts of Fritillaria thunbergii, 6 parts of Lonicera japonica, 4 parts of Atractylodes macrocephala, 2 parts of Aucklandia lappa, 3 parts of Polygala tenuifolia, 4 parts of Eucommia ulmoides, 5 parts of Rehmannia glutinosa, 3 parts of Pogostemon cablin, 5 parts of Sophora flavescens, 3 parts of Schizonepeta tenuifolia, 4 parts of Isatis indigotica; the formula of the essential oil ingredients is: 1 part, including 0.2 parts of chamomile oil, 0.2 parts of rosemary oil, 0.1 parts of tea tree oil, 0.3 parts of perilla leaf oil, 0.1 parts of pogostemon oil, 0.1 parts of ginger oil. The ratio of the above bath liquid base to deionized water is 1:8, and the pH value is 6.5. The preparation process is the same as that of Example 1.

[0043] Example 3

[0044] Based on Example 1, the formula of the herbal ingredients is: 15 parts of Houttuynia cordata, 5 parts of Fritillaria thunbergii, 7 parts of Lonicera japonica, 6 parts of Atractylodes macrocephala, 3 parts of Aucklandia lappa, 4 parts of Polygala tenuifolia, 5 parts of Eucommia ulmoides, 6 parts of Rehmannia glutinosa, 3 parts of Pogostemon cablin, 6 parts of Sophora flavescens, 4 parts of Schizonepeta tenuifolia, 5 parts of Isatis indigotica; the formula of the essential oil ingredients remains unchanged. The ratio of the above bath liquid base to deionized water is 1:9, and the pH value is 6.5. In the preparation process, in Step 5, an ultrasonic emulsifier is used, the frequency is set to 20 - 30 kHz, the pulse mode is used, the treatment time is 5 - 10 minutes, and the temperature is controlled not to exceed 40°C to avoid high temperature from destroying the active ingredients of the essential oil. The rest is the same as that of Example 1.

[0045] Comparative Example 1

[0046] Adopt the traditional herbal bath liquid preparation process (without using nano-encapsulation).

[0047] Raw materials: 10 parts of Houttuynia cordata, 6 parts of Fritillaria thunbergii, 8 parts of Lonicera japonica, 5 parts of Atractylodes macrocephala, 3 parts of Aucklandia lappa, 4 parts of Polygala tenuifolia, 5 parts of Eucommia ulmoides, 7 parts of Rehmannia glutinosa, 3 parts of Pogostemon cablin, 6 parts of Sophora flavescens, 4 parts of Schizonepeta tenuifolia, 5 parts of Isatis indigotica, 2 parts of herbal essential oil, appropriate amount of deionized water.

[0048] Crush and extract the herbal plants to obtain the herbal extract. Add the herbal essential oil to the herbal extract, adjust the pH value and bottle it.

[0049] Comparative Example 2

[0050] Herbal bath liquid, using simple wrapping materials but without nano encapsulation.

[0051] Raw materials: 10 parts of Houttuynia cordata, 7 parts of Fritillaria thunbergii, 8 parts of Lonicera japonica, 7 parts of Atractylodes macrocephala, 4 parts of Aucklandia lappa, 5 parts of Polygala tenuifolia, 5 parts of Eucommia ulmoides, 6 parts of Rehmannia glutinosa, 3 parts of Pogostemon cablin, 2 parts of herbal essential oil, and appropriate amount of deionized water.

[0052] Add the herbal plant powder into water, and extract to obtain the herbal extract; use an emulsifier to encapsulate the herbal essential oil component, mix and adjust the pH value, and then bottle it.

[0053] Detection methods and effects

[0054] The present invention adopts a variety of detection means to verify the effects and stability of the conditioning herbal bath liquid. First, the high performance liquid chromatography (HPLC) is used to detect the content of active ingredients in herbal components (such as Lonicera japonica, Houttuynia cordata, etc.) to ensure the quality and concentration of the herbal extract. Secondly, the human skin model penetration experiment is used to evaluate the permeability of the active ingredients in the bath liquid to further verify the improvement effect of the nano encapsulation technology. In addition, the clinical trial evaluates the skin soothing effect through the allergy reaction score. To test the stability of the product, the bath liquid is stored at high temperature for one month, and the pH value test is used to ensure the stability and suitability of the solution.

[0055] The final detection results are shown in the following table:

[0056] Table 1 Summary table of detection results

[0057]

[0058] As can be seen from Table 1, Example 1, Example 2 and Example 3 are significantly superior to Comparative Example 1 and Comparative Example 2 in terms of the content of active ingredients, permeability, skin soothing effect and stability. Through HPLC detection, the content of active ingredients in Example 1, Example 2 and Example 3 is relatively high, indicating that the herbal components and essential oil components in these formulations are effectively extracted and maintain a relatively high concentration.

[0059] In terms of permeability and skin soothing effect, Example 1 shows the most prominent performance, indicating that the nano encapsulation technology plays an important role in improving the effect of the herbal bath liquid. Example 2 and Example 3 also show good effects, further verifying the effectiveness of the technical solution. Therefore, the conditioning herbal bath liquid and its preparation method of the present invention can provide efficient, safe and mild conditioning effects, and have broad application prospects, especially in skin health care and soothing, with obvious advantages.

[0060] In summary, the present invention uses nano-encapsulation technology to significantly improve the permeability and bioavailability of herbal ingredients, enabling them to quickly penetrate the skin, condition the body, and provide a soothing effect. The bath liquid contains no chemically irritating ingredients and uses natural herbal essential oils, ensuring the safety of the product and its mildness to the skin. Through an optimized preparation method, the stability of the herbal extract is enhanced, ensuring that its efficacy can be maintained for a long time during storage, thereby extending the shelf life of the product.

[0061] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A herbal bath liquid for conditioning, characterized in that, The bath liquid is prepared by mixing a bath liquid base with deionized water or purified water in a ratio of 1:1 to 1:

10. Among them, the bath liquid base includes herbal ingredients and essential oil ingredients. The herbal ingredients are obtained by extracting Houttuynia cordata, Fritillaria thunbergii, Lonicera japonica, Atractylodes macrocephala, Aucklandia lappa, Polygala tenuifolia, Eucommia ulmoides, Rehmannia glutinosa, Pogostemon cablin, Sophora flavescens, Schizonepeta tenuifolia, and Isatis indigotica Fort. according to a preset weight ratio; the essential oil ingredients are composed of one or several of lavender oil, chamomile oil, rosemary oil, tea tree oil, perilla leaf oil, pogostemon oil, and ginger oil.

2. The herbal bath liquid for conditioning according to claim 1, wherein The herbal ingredients are composed of the following components in parts by weight: 5-15 parts of Houttuynia cordata; 3-8 parts of Fritillaria thunbergii; 5-10 parts of Lonicera japonica; 4-8 parts of Atractylodes macrocephala; 2-5 parts of Aucklandia lappa; 3-6 parts of Polygala tenuifolia; 3-6 parts of Eucommia ulmoides; 4-8 parts of Rehmannia glutinosa; 2-5 parts of Pogostemon cablin; 5-10 parts of Sophora flavescens; 3-5 parts of Schizonepeta tenuifolia; 3-6 parts of Isatis indigotica Fort.

3. The herbal bath liquid for conditioning according to claim 1, wherein The weight ratio of the essential oil ingredients is 0.5-3 parts, including 0.1-0.5 parts of lavender oil, 0.1-0.3 parts of chamomile oil, 0.05-0.2 parts of rosemary oil, 0.05-0.2 parts of tea tree oil, 0.1-0.3 parts of perilla leaf oil, 0.05-0.15 parts of pogostemon oil, and 0.05-0.15 parts of ginger oil.

4. The herbal bath liquid for conditioning according to claim 3, wherein The bath liquid base further includes a non-ionic emulsifier, and the emulsifier is selected from hydrogenated castor oil PEG-40 or CO40, and its weight ratio is 0.5-2 parts.

5. The herbal bath liquid for conditioning according to claim 4, wherein, The pH value of the bath liquid is 5.0-6.

5.

6. A nano-encapsulation preparation process of the conditioning herbal bath liquid as described in any one of claims 1-5, characterized in that, It includes the following steps: Step 1, pretreatment of herbal ingredients: Mix Houttuynia cordata, Fritillaria thunbergii, Lonicera japonica, Atractylodes macrocephala, Aucklandia lappa, Polygala tenuifolia, Eucommia ulmoides, Rehmannia glutinosa, Pogostemon cablin, Sophora flavescens, Schizonepeta tenuifolia, and Isatis indigotica Fort. according to a preset weight ratio, wash them clean and dry them at 50-70°C until the moisture content is less than 10%. Step 2, preparation of herbal extract: After crushing the dried herbal raw materials to 80-120 meshes, use water extraction or alcohol extraction methods to obtain a herbal plant extract, filter and concentrate it to obtain the required herbal extract. Step 3, essential oil treatment: Mix one or several of lavender oil, chamomile oil, rosemary oil, tea tree oil, perilla leaf oil, pogostemon oil, and ginger oil according to a preset ratio, and slowly heat it below 40°C, stir evenly, and keep the temperature not exceeding the degradation point of the essential oil active ingredients. Step 4, preliminary emulsification: Mix the essential oil and the emulsifier in a ratio of 1:1 to 1:3, use a magnetic stirrer or a high-speed shear emulsifier to stir, the shear speed is 3000-6000 rpm, and the duration is 5-10 minutes to ensure that the essential oil is evenly dispersed to form a stable emulsion. Step 5, nano-encapsulation treatment: Use high-pressure homogenization method or ultrasonic emulsification method to carry out nano-sizing treatment of the essential oil. Homogenize the preliminarily emulsified mixture, increase the pressure in stages, the treatment time is 5-10 minutes, and the essential oil particles are refined to 50-200 nm. Step 6, stability test: Use centrifugal test or accelerated aging test to test whether the bath liquid is layered or precipitated, and adjust the emulsifier ratio or homogenization treatment parameters according to the test results. Step 7, finished product packaging: Package the qualified bath liquid after stability testing in a light-shielded and nitrogen-filled manner, and store it in a cool and dry place.

7. The preparation process according to claim 6, characterized in that, In the said Step 2, the concentration method of the herbal extract uses evaporation concentration or membrane separation technology to concentrate the herbal extract to the required concentration.

8. The preparation process according to claim 7, characterized in that, The high-pressure homogenization method in the said Step 5 is to pass the preliminarily emulsified mixture through a high-pressure homogenizer with a homogenization pressure of 500 - 1500 bar, and repeat the homogenization treatment 3 - 5 times to ensure the nano-scale dispersion of the essential oil particles.

9. The preparation process according to claim 7, characterized in that, The ultrasonic emulsification method in the said Step 5 is to use an ultrasonic emulsifier, set the frequency at 20 - 30 kHz, pulse mode, with a treatment time of 5 - 10 minutes, and control the temperature not exceeding 40°C to avoid the destruction of the active ingredients of the essential oil by high temperature.

10. The preparation process according to claim 8 or 9, characterized in that, The stability testing in the said Step 6 includes centrifugation testing, accelerated aging testing, and layering testing to ensure that the prepared bath liquid will not undergo layering or precipitation during storage and has a shelf life of more than 6 months.

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