Lithospermum liquid shampoo soap and preparation method thereof

Abstract

The invention provides lithospermum liquid shampoo soap and a preparation method thereof, and belongs to the technical field of liquid soap. The preparation method comprises the following steps: mixing lithospermum oil, nigella nigra seed oil and coconut oil to obtain a vegetable oil mixture I; mixing more than two of fennelflower essential oil, lavender essential oil, jasmine essential oil and ginger essential oil to obtain a vegetable oil mixture II; freezing the Wumann grass juice, and adding potassium hydroxide for dissolving to obtain alkali juice; adding the alkali juice into the first part of the vegetable oil mixture I, stirring for emulsification reaction, then adding the vegetable oil mixture II, and continuously stirring to obtain liquid soap; putting the liquid soap into a mold, and carrying out saponification reaction to obtain a soap blank; mixing the soap embryo with lavender hydrolat, heating until the soap embryo and the lavender hydrolat are completely dissolved, then adding a second part of the vegetable oil mixture I and the emulsifier, and carrying out secondary emulsification; and adding a selective functional additive, uniformly mixing, standing and filtering. The liquid shampoo soap is mild, high in active matter content and excellent in heat-resistant and cold-resistant stability.

Description

Technical Field

[0001] This invention belongs to the field of liquid soap technology, specifically relating to comfrey liquid shampoo soap and its preparation method. Background Technology

[0002] Shampoo products commonly use surfactants to achieve a cleaning effect. For example, patent application CN109419638A discloses an anti-dandruff shampoo bar whose raw materials, by weight, include: 20-30 parts of main surfactant, 10-17 parts of co-surfactant, 1-3 parts of thickener, 3-5 parts of cosolvent, 1-6 parts of ethylene glycol monostearate, 1-5 parts of cyclopentylsiloxane / polydimethylsiloxane alcohol, 0.1-1 part of anti-dandruff agent, 0.3-0.8 parts of iodopropynylcarbamate, 3-6 parts of citric acid, and 1-3 parts of plant essential oil. This shampoo bar mainly uses synthetic surfactants, such as sodium lauryl sulfate, sodium dodecylbenzene sulfonate, and imidazoline betaine. These surfactants achieve their cleaning function by reducing the surface tension of liquids, but some components (such as LAS) have hydrophobic groups with strong chemical stability, making them difficult to biodegrade; furthermore, long-term use of synthetic surfactants may interfere with the scalp microenvironment, exacerbating hair loss, and polluting the environment when discharged into water bodies.

[0003] To address these issues, natural surfactants have gradually gained attention. Natural surfactants are derived from the metabolic products of animals, plants, or microorganisms, and mainly include naturally occurring surface-active components and their derivatives. These substances exhibit activity in reducing surface tension and emulsifying dispersion, and have characteristics such as low toxicity and good biodegradability. However, their detergency and penetration are generally weaker than those of synthetic surfactants, and they are prone to becoming cloudy in winter and separating in summer, making transportation and storage troublesome. For example, patent application CN102961292A discloses a pure plant essential oil shampoo soap, comprising patchouli essential oil, orange essential oil, lavender essential oil, pine essential oil, lemongrass essential oil, lemon essential oil, elemi essential oil, citral, geraniol, linalool, gardenia extract, Roman chamomile extract, water, and sodium hydroxide. The sodium hydroxide is dissolved in heated water and then cooled. The patchouli essential oil, orange essential oil, lavender essential oil, pine essential oil, lemongrass essential oil, lemon essential oil, elemi essential oil, citral, geraniol, and linalool are heated until dissolved and then cooled. The sodium hydroxide solution is poured into the essential oil solution and stirred evenly. The gardenia extract and Roman chamomile extract are then added to the solution and stirred evenly. The evenly mixed mixture is poured into a mold and left to stand until the soap solidifies. After solidification, the mold is removed, and the soap is placed in a cool, ventilated place to mature before use. This shampoo bar is a solid soap. Although the raw materials used are mostly plant-based, green, natural, and relatively mild, the active ingredients undergo saponification in the preparation method, resulting in a low total active ingredient content in the shampoo bar, and its heat and cold resistance is generally poor.

[0004] Therefore, it is particularly important to find a way to significantly increase the content of active ingredients in products while maintaining their natural biodegradability and simultaneously meeting the requirements for heat and cold resistance, for the application of natural surfactants in liquid shampoos. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the technical problem to be solved by this invention is to provide a method for preparing a liquid shampoo soap containing comfrey, which is mild, has a high content of active ingredients, and exhibits excellent heat and cold resistance.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for preparing a liquid comfrey shampoo soap, comprising the following steps: S01: Mix comfrey oil, black cumin seed oil and coconut oil to obtain vegetable oil mixture I; S02: Mix two or more of black cumin essential oil, lavender essential oil, jasmine essential oil and ginger essential oil to obtain plant oil mixture II; S03: Freeze the juice of Usmania spp., and dissolve potassium hydroxide in the ice obtained after freezing to obtain alkaline juice; S04: Add the lye juice to the first part of the vegetable oil mixture I, stir homogenously to carry out the emulsification reaction, then add the vegetable oil mixture II, continue stirring to obtain soap solution; S05: Place the soap solution in a mold to carry out a saponification reaction and obtain a soap base; S06: Mix the soap base with lavender hydrosol, heat until completely dissolved, then add the second part of the plant oil mixture I and the emulsifier for secondary emulsification; then selectively add functional additives, mix evenly, let stand, filter, and obtain the purple gromwell liquid shampoo soap.

[0007] Optionally, the mass ratio of the first part of the vegetable oil mixture I to the second part of the vegetable oil mixture I is 2:1.

[0008] Optionally, in step S01, the mixing temperature is 45-55°C.

[0009] In step S03, the freezing temperature is below -4°C, and the juice of Usmania is frozen into ice cubes.

[0010] Optionally, in step S04, the homogenization stirring time is 25-50 minutes, and the stirring time after adding vegetable oil mixture II is 25-50 minutes. A homogenizer is used for the homogenization stirring process.

[0011] Optionally, in step S05, the saponification reaction is carried out at a temperature of 50-60°C for 24-30 hours.

[0012] In step S06, the temperature at which the mixture is heated to complete dissolution is 50~60℃.

[0013] In step S06, the functional additive is one or more of the following: nutrient, foaming agent, moisturizer, thickener, viscosity modifier, skin soothing agent, and pH adjuster.

[0014] The present invention also provides a liquid comfrey shampoo soap prepared by the above method.

[0015] A liquid comfrey shampoo bar, by weight, contains the following ingredients: 9-14 parts comfrey oil, 3-8 parts coconut oil, 3-8 parts black cumin seed oil, 0-1 part black cumin essential oil, 0-1 part lavender essential oil, 0-1 part jasmine essential oil, 0-1 part ginger essential oil, 25-36 parts lavender hydrosol, 15-24 parts eusminoides juice, 0.1-1 part potassium hydroxide, and 14-40 parts functional additives.

[0016] Optionally, the black cumin essential oil is 0.3-1 parts by weight, the lavender essential oil is 0.3-1 parts by weight, the jasmine essential oil is 0.1-0.5 parts by weight, and the ginger essential oil is 0.1-0.5 parts by weight.

[0017] Optionally, the functional additive contains the following raw materials in parts by weight: 0-5 parts of nutrient, 8-12 parts of foaming agent, 3-7 parts of moisturizer, 2-6 parts of emulsifier, 1-5 parts of thickener, 0.5-2 parts of viscosity modifier, 0.1-1 parts of skin soothing agent, and 0.1-1 parts of pH adjuster.

[0018] Optionally, the nutrient is ginseng extract.

[0019] Optionally, the foaming agent is selected from sodium cocoyl malic acid and / or potassium cocoyl glycinate, preferably sodium cocoyl malic acid.

[0020] Optionally, the moisturizer is selected from one or more of propylene glycol, glycerin, and butylene glycol, preferably propylene glycol.

[0021] Optionally, the emulsifier is selected from sorbitan fatty acid ester and / or alkyl glucoside, wherein the sorbitan fatty acid ester is preferably sorbitan olive oil ester, and the alkyl glucoside is preferably cetearyl glucoside, and the mass ratio of sorbitan olive oil ester to cetearyl glucoside is preferably 1:(0.1~1).

[0022] Optionally, the thickener is selected from cocamide DEA and / or palm kernel oleamide DEA, preferably palm kernel oleamide DEA.

[0023] Optionally, the viscosity modifier may be sodium chloride.

[0024] Optionally, the skin soothing agent is selected from one or more of glycyrrhizic acid, bisabolol, centella asiatica extract, and allantoin, preferably glycyrrhizic acid, and more preferably dipotassium glycyrrhizate.

[0025] Optionally, the pH adjuster contains an organic acid selected from one or more of lactic acid, citric acid, and tartaric acid, preferably lactic acid.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a method for preparing a liquid shampoo soap based on the above-mentioned technical solution. By combining steps such as staged addition of the oil phase, frozen alkali saponification, and secondary emulsification, it solves the technical problem of poor heat and cold resistance stability of natural surfactant systems at high active ingredient content. In this invention, S01: Prepare a mixture of vegetable oils I to form the base oil phase for the saponification reaction, providing a reaction substrate for subsequent saponification. S02: Freeze ursamum indicum juice to prepare alkali juice to protect the heat-sensitive active ingredients. Freezing and dissolving greatly delays the intense exothermic reaction in the initial stage of saponification, avoiding high-temperature damage to the heat-sensitive active ingredients in the ursamum indicum juice. Simultaneously, it controls the reaction rate, making the release and reaction of potassium hydroxide more gradual and uniform, which is beneficial for forming a more uniform and stable soap base. Steps S02, S01, and S04 work synergistically to ensure that the highly active aqueous phase components can be successfully introduced into the soap body without deactivation, laying the foundation for achieving a high active ingredient content. S03: Prepare vegetable oil mixture II to ensure its uniform dispersion and stability in the subsequent water-oil mixture system. This, combined with the timing of S04's later addition, prevents essential oils from being directly exposed to a strongly alkaline environment and thus saponifying and destroying them, maximizing the retention of volatile active ingredients. S04: Add lye solution first, then vegetable oil mixture II. First, ensure that vegetable oil mixture I reacts fully with potassium hydroxide to form potassium soap. After basic saponification is complete, introduce vegetable oil mixture II, allowing most of its active ingredients to be encapsulated in the emulsion system as unsaponified active ingredients, directly remaining in the product as active ingredients, overcoming the contradiction between high active ingredient content and stability. S05: Saponification in a mold provides a stable and controlled environment for the raw materials, ensuring complete saponification and forming a structurally stable soap base, improving quality. S06: Secondary emulsification and introduction of specific functional additives, using lavender hydrosol as an aqueous carrier to provide natural active ingredients and fragrance; the addition of the second part, plant oil mixture I, further increases the content of natural active ingredients in the product; the soap base and the added emulsifier work synergistically to form a denser and stronger liquid crystal structure, stably encapsulating the active ingredients, forming a uniform and stable system as a whole, synergistically solving the heat and cold stability problems of liquid soap. The prepared liquid shampoo soap is natural and mild, with a high content of active ingredients and excellent heat and cold stability.

[0027] This invention's liquid shampoo bar uses comfrey oil, black cumin seed oil, and coconut oil, providing anti-inflammatory, soothing, scalp circulation-promoting, and hair follicle-nourishing effects. Lavender hydrosol and eusmanthus juice, as aqueous carriers, replace deionized water, providing natural fragrance, moisturizing properties, and specific plant activities. They not only act as solvents but also provide hair-nourishing and soothing effects. Coconut oil, after saponification, forms potassium soap, which, combined with a foaming agent, provides excellent cleansing power. The foaming agent uses amino acid surfactants to reduce overall irritation and increase gentleness. The combination of potassium soap and amino acid surfactants ensures cleansing power while providing a gentle skin feel, synergistically reducing the irritation of the liquid shampoo bar to the scalp and eyes. The emulsifiers selected are sorbitan fatty acid esters and / or alkyl glucosides, which have good compatibility with ionic potassium soap / amino acid surfactants, forming stable complex micelles that encapsulate plant oils and / or active ingredients. The thickener is selected from cocamide DEA and / or palm kernel oleamide DEA, and the viscosity modifier is sodium chloride. These components synergistically adjust the rheological properties of the system, achieving a pleasant skin feel and further enhancing emulsification stability through thickening. The emulsifier, thickener, and viscosity modifier together construct a multi-layered, mutually supportive stable network, enabling the liquid soap to withstand hot and cold cycles and maintain its consistency during long-term storage. In addition, nutrients, skin soothing agents, pH adjusters, and moisturizers are selectively added to the liquid soap. Nutrients further enhance the skin conditioning effect, skin soothing agents further improve the mildness and comfort of the liquid soap, pH adjusters adjust the liquid soap to a slightly alkaline state, conforming to the scalp environment, and also assist in preservation, while moisturizers enhance the shine of the hair after washing. Therefore, the liquid shampoo bar prepared by this invention is naturally mild, has a pleasant skin feel, high activity, and high stability.

[0028] This invention uses specific raw materials and appropriate manufacturing processes to obtain liquid shampoo soap. The shampoo soap is natural and mild, with a total active ingredient content of more than 30%, a total phosphorus pentoxide content of less than 0.1%, and is cold-resistant, heat-resistant, and has good stability. Detailed Implementation

[0029] To better understand the present invention, the following embodiments further illustrate the content of the invention, but the scope of protection of the present invention is not limited to the following embodiments. Numerous specific details are set forth in the following description to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details.

[0030] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention.

[0031] All raw materials and reagents used in the embodiments of this invention are commercially available.

[0032] Comfrey oil, also known as Lithospermum erythrorhizon root extract, is derived from the dried roots of Arnebia euchroma (Royle) Johnst., Lithospermum erythrorhizon Sieb. et Zucc., or Arnebia guttata Bunge, all belonging to the Boraginaceae family. Its active ingredient is shikonin, also known as shikonin, shikonin, or shikonin root extract.

[0033] Usman grass juice is extracted from Usman grass (Uyghur word), which is rich in isothia suspensa glycosides, glucosinolates and other components.

[0034] Nigella seed oil is extracted from the seeds of Nigella nigra, which is called "Siyadan" in Xinjiang. Its main active ingredients include thymol, Omega-6, and Omega-9 unsaturated fatty acids.

[0035] Nigella essential oil is obtained from the flowers and leaves of Nigella through steam distillation and is rich in volatile components such as terpenes.

[0036] Lavender essential oil is the upper oil phase product obtained by distillation and extraction of fresh lavender flowers. It is rich in highly volatile components, such as linalool and linalyl acetate. Lavender hydrosol is the middle and lower aqueous phase product obtained by distillation and extraction of fresh lavender flowers. It contains trace amounts of essential oil components and water-soluble active ingredients.

[0037] In this embodiment of the invention, steps without a specific temperature are all performed at room temperature, which refers to 25°C.

[0038] Examples 1-6: A liquid comfrey shampoo soap, the raw material composition of which is shown in Table 1.

[0039] The comfrey liquid shampoo bars described in Examples 1-6 were all prepared according to the following method: S01: Mix comfrey oil, black cumin seed oil and coconut oil to obtain vegetable oil mixture I; S02: Mix two or more of black cumin essential oil, lavender essential oil, jasmine essential oil and ginger essential oil to obtain plant oil mixture II; S03: Freeze the juice of Usmania spp., and dissolve potassium hydroxide in the ice obtained after freezing to obtain alkaline juice; S04: Add the lye juice to the first part of the vegetable oil mixture I, stir homogenously to carry out the emulsification reaction, then add the vegetable oil mixture II, continue stirring to obtain soap solution; S05: Place the soap solution in a mold to carry out the saponification reaction and obtain a soap base; S06: Mix the soap base with lavender hydrosol and heat until completely dissolved; Then add the second part of the vegetable oil mixture I and the emulsifier for secondary emulsification; then selectively add one or more of the following: nutrients, foaming agents, moisturizers, thickeners, viscosity modifiers, skin soothing agents or pH adjusters, mix well, let stand, filter, and obtain the comfrey liquid shampoo soap.

[0040] The mass ratio of the first part (vegetable oil mixture I) to the second part (vegetable oil mixture I) is 2:1.

[0041] In step S01, the mixing temperature is 50°C, and water bath heating is used.

[0042] In step S03, the freezing temperature is -4℃.

[0043] In step S04, the homogenization time is 25 minutes, and the mixing time continues for 30 minutes after adding vegetable oil mixture II. A homogenizer is used for the homogenization process.

[0044] In step S05, the saponification reaction is carried out at a temperature of 55°C for 24 hours.

[0045] In step S06, the temperature is heated to 60°C until completely dissolved; the standing time is 24 hours.

[0046] Table 1. Raw material composition of Examples 1-6 Example 7: A method for preparing a liquid comfrey shampoo soap, which differs from Example 1 in that the mixing temperature in step S01 is 45°C.

[0047] In step S04, the homogenization time is 25 minutes, and the mixing time continues for 50 minutes after adding vegetable oil mixture II. A homogenizer is used for the homogenization process.

[0048] In step S05, the saponification reaction is carried out at a temperature of 50°C for 30 hours.

[0049] Example 8: A method for preparing a liquid comfrey shampoo soap, which differs from Example 1 in that the mixing temperature in step S01 is 55°C.

[0050] In step S04, the homogenization time is 50 minutes, and the mixing time continues for 25 minutes after adding vegetable oil mixture II. A homogenizer is used for the homogenization process.

[0051] In step S05, the saponification reaction is carried out at a temperature of 60°C for 24 hours.

[0052] The following are comparative case studies.

[0053] Comparative Example 1: A method for preparing a liquid comfrey shampoo bar, differing from Example 3 only in that: S03 and S04 are respectively replaced with: S03': Dissolve oosmanthus juice with potassium hydroxide at room temperature to obtain alkaline juice; S04': Add the lye juice obtained in S03' to the first part of the vegetable oil mixture I, and stir homogenously at 60°C for 15 minutes to carry out the emulsification reaction. Then add the vegetable oil mixture II and continue stirring to obtain the soap solution. The remaining steps and parameters are the same as in Example 3.

[0054] Comparative Example 2: A method for preparing a liquid comfrey shampoo bar, which differs from Example 3 in that: S01': Mix comfrey oil, black cumin seed oil, coconut oil, black cumin essential oil, lavender essential oil, jasmine essential oil and ginger essential oil to obtain a mixture of plant oils; S04': Add the lye juice to the vegetable oil mixture of S01', and stir homogenously to carry out the emulsification reaction to obtain soap solution; S06' Mix soap base with lavender hydrosol, heat until completely dissolved, then add emulsifier for secondary emulsification; then selectively add one or more of the following: nutrients, foaming agents, moisturizers, thickeners, viscosity modifiers, skin soothing agents, or pH adjusters, mix evenly, let stand, filter, and obtain comfrey liquid shampoo soap.

[0055] Comparative Example 3: A method for preparing a liquid comfrey shampoo soap, which differs from Example 3 in that the step S06 "then add the second part of the vegetable oil mixture I and the emulsifier for secondary emulsification" is omitted, and the remaining steps and parameters are the same as in Example 3.

[0056] Comparative Example 4: A method for preparing a liquid comfrey shampoo soap, which differs from Example 3 in that: in step S05, the saponification reaction temperature is 80°C and the time is 6 hours.

[0057] Next, the content of the evaluation test will be explained.

[0058] The sensory and physicochemical properties of the liquid shampoo soaps prepared in Examples 1-6 and Comparative Examples 1-4 were tested according to the enterprise standard Q / HCWCHG 001-2024 "Liquid Soap".

[0059] 1. Sensory indicators Sensory indicators should meet the requirements of Table 1.

[0060] Table 1 Sensory Indicators According to the standard, the sample was visually inspected for its shape, color, and impurities at room temperature and under non-direct sunlight, and its odor was also observed. "○" indicates that it meets the requirements of this indicator, and "×" indicates that it does not meet the requirements of this indicator. The results are shown in Table 2.

[0061] Table 2. Sensory index test results 2. Physicochemical Indicators The physicochemical properties should meet the requirements of Table 3.

[0062] Table 3 Physicochemical Indicators According to the standard, the pH value, total active ingredient content, total phosphorus pentoxide, heat resistance and cold resistance of the samples were tested. "○" indicates that the sample meets the requirements of the specified index, and "×" indicates that the sample does not meet the requirements of the specified index. The results are shown in Table 4.

[0063] Table 4. Results of Physicochemical Indicators Test The results in Tables 2 and 4 show that the sensory and physicochemical indicators of the liquid shampoo bar of the present invention meet the relevant standards. Specifically, the pH value is 7.5±0.2, indicating weak alkalinity; the total active ingredient content is >30%, far exceeding the standard requirements; the total phosphorus pentoxide content is <0.1%, far below the standard requirements; it is heat-resistant and cold-resistant, with no oil-water separation or soap base precipitation.

[0064] Compared to Example 3, Comparative Example 1 uses a hot process instead of the frozen lye step. The saponification and higher reaction temperature cause the heat-sensitive active ingredients in the eusmanthus juice and some plant essential oils to become inactive, resulting in abnormal product color and odor. Impurities lead to poor emulsification stability, ultimately resulting in deterioration of the product's color, impurities, and odor, a significant decrease in the total active ingredient content, and poor heat and cold resistance. This indicates that the use of frozen lye in this invention is beneficial to significantly improve the sensory and physicochemical properties of liquid shampoo soap.

[0065] Compared to Example 3, Comparative Example 2 omits the stepwise addition of plant oils, opting instead for a single, mixed addition. All plant essential oils come into direct contact with the alkali simultaneously, resulting in an almost identical probability of saponification into soap bases. Under this reaction system, the efficacy of the plant essential oils as active ingredients is reduced, primarily contributing to cleaning effects. Simultaneously, the alkali content is relatively insufficient, leading to incomplete saponification and an increase in residual free fatty acids, resulting in insufficient aroma, a pH below 4.5, and a significant decrease in total active ingredient content. This indicates that the present invention, by adding plant essential oils stepwise, adds a portion of the essential oils after the main saponification reaction is complete, allowing them to be emulsified and encapsulated in a free state rather than being consumed by the saponification reaction, thereby ensuring the product has suitable pH and high active ingredient content.

[0066] Compared to Example 3, Comparative Example 3 omits the secondary emulsification process. The soap base obtained in S05 is mixed with lavender hydrosol, heated to dissolve, and then foaming agents, humectants, and other components are directly added for blending. The second part (plant oil mixture I) and emulsifier are not added. Due to the omission of coconut oil and the second part (plant oil mixture I), the total active ingredient content significantly decreases; simultaneously, the system exhibits deterioration phenomena such as oil-water separation, floating oil, and soap base precipitation; the pH is close to 10.0; and the heat and cold resistance is poor. This indicates that the secondary emulsification method used in this invention, combined with potassium soap, has a significant impact on stabilizing the product system and achieving heat and cold resistance.

[0067] Compared to Example 3, Comparative Example 4 altered the temperature and time of the saponification reaction. While a higher temperature and shorter time resulted in a faster reaction rate, it also posed a greater risk of localized overheating, leading to the destruction of some plant essential oils and introduced active ingredients, resulting in a decrease in the total active ingredient content. This resulted in a darker product color and an unpleasant odor. Furthermore, the reaction was not uniform or thorough enough, leading to a high residual alkali content, an increased pH value, and poor heat and cold resistance. This demonstrates that the present invention employs a suitable saponification temperature to ensure a gentle, thorough, and uniform saponification reaction, laying the foundation for subsequent steps and facilitating the preparation of liquid shampoo bars with significantly improved sensory and physicochemical properties.

[0068] In summary, the liquid shampoo bar prepared by the method of the present invention is mild, has a high content of active ingredients, excellent heat and cold resistance, and excellent overall quality.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention, as long as they do not depart from the spirit and scope of the technical solutions of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A method for preparing a liquid comfrey shampoo soap, characterized in that: Includes the following steps: S01: Mix comfrey oil, black cumin seed oil and coconut oil to obtain vegetable oil mixture I; S02: Mix two or more of black cumin essential oil, lavender essential oil, jasmine essential oil and ginger essential oil to obtain plant oil mixture II; S03: Freeze the juice of Usmania spp., and dissolve potassium hydroxide in the ice obtained after freezing to obtain alkaline juice; S04: Add the lye juice to the first part of the vegetable oil mixture I, stir homogenously to carry out the emulsification reaction, then add the vegetable oil mixture II, continue stirring to obtain soap solution; S05: Place the soap solution in a mold to carry out a saponification reaction and obtain a soap base; S06: Mix the soap base with lavender hydrosol, heat until completely dissolved, then add the second part of the plant oil mixture I and the emulsifier for secondary emulsification; then selectively add functional additives, mix evenly, let stand, filter, and obtain the purple gromwell liquid shampoo soap.

2. The method for preparing a liquid comfrey shampoo soap as described in claim 1, characterized in that: The mass ratio of the first part of the vegetable oil mixture I to the second part of the vegetable oil mixture I is 2:

1.

3. The method for preparing a liquid comfrey shampoo soap as described in claim 2, characterized in that: In step S01, the mixing temperature is 45-55℃.

4. The method for preparing a liquid comfrey shampoo soap as described in claim 3, characterized in that: In step S04, the homogenization stirring time is 25-50 minutes, and the stirring time continues for 25-50 minutes after adding the vegetable oil mixture II. A homogenizer is used for the homogenization stirring process.

5. The method for preparing a liquid comfrey shampoo soap as described in claim 4, characterized in that: In step S05, the saponification reaction is carried out at a temperature of 50-60°C for 24-30 hours.

6. The method for preparing a liquid comfrey shampoo soap as described in claim 5, characterized in that: The functional additives are one or more of the following: nutrients, foaming agents, moisturizers, thickeners, viscosity modifiers, skin soothing agents, and pH adjusters.

7. The comfrey liquid shampoo soap obtained by the preparation method of any one of claims 1-6, characterized in that: By weight, it contains the following ingredients: 9-14 parts comfrey oil, 3-8 parts coconut oil, 3-8 parts black cumin seed oil, 0-1 part black cumin essential oil, 0-1 part lavender essential oil, 0-1 part jasmine essential oil, 0-1 part ginger essential oil, 25-36 parts lavender hydrosol, 15-24 parts eusminoides juice, 0.1-1 part potassium hydroxide, and 14-40 parts functional additives.

8. The comfrey liquid shampoo bar as described in claim 7, characterized in that: The black cumin essential oil is 0.3-1 parts by weight, the lavender essential oil is 0.3-1 parts by weight, the jasmine essential oil is 0.1-0.5 parts by weight, and the ginger essential oil is 0.1-0.5 parts by weight.

9. The comfrey liquid shampoo bar as described in claim 8, characterized in that: The functional additive contains the following raw materials in parts by weight: 0-5 parts of nutrient, 8-12 parts of foaming agent, 3-7 parts of moisturizer, 2-6 parts of emulsifier, 1-5 parts of thickener, 0.5-2 parts of viscosity modifier, 0.1-1 parts of skin soothing agent, and 0.1-1 parts of pH adjuster.

10. The comfrey liquid shampoo bar as described in claim 9, characterized in that: The nutrient is ginseng extract; The foaming agent is selected from sodium cocoyl malic acid and / or potassium cocoyl glycinate; The moisturizer is selected from one or more of propylene glycol, glycerin, and butylene glycol; The emulsifier is selected from sorbitan fatty acid esters and / or alkyl glucosides; The thickener is selected from cocamide DEA and / or palm kernel oleamide DEA; Sodium chloride is selected as the viscosity modifier; The skin soothing agent is selected from glycyrrhizic acid salts; The pH adjuster contains an organic acid, which is selected from one or more of lactic acid, citric acid, and tartaric acid.

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