Essential oil soap with moistening and moisturizing functions and preparation method thereof

Abstract

The invention relates to the technical field of daily chemical wash supplies, in particular to essential oil soap with moistening and moisturizing functions and a preparation method thereof.The essential oil soap is prepared from, by weight, 40%-70% of a vegetable fat mixture, 3%-10% of natural essential oil, 5%-15% of moisturizing active ingredients, 15%-30% of alkali liquor, 1%-5% of a supramolecular water locking agent and 0.5%-3% of an auxiliary additive; sodium hyaluronate, glycerin and aloe gel are compounded according to a specific proportion to form a dynamic moisturizing layer, the water loss rate of the skin within several hours after washing is stably reduced, so that the coexistence of cleaning and moisturizing functions is realized, after modified beta-cyclodextrin and trehalose are compounded according to a specific proportion, soap body dissolution liquid forms a'water molecule library 'on the skin surface, and the water molecule library is used for moisturizing the skin. Therefore, the moisture maintaining time is prolonged, the moisture loss efficiency is reduced, and the effect is obviously higher than the transient wetting effect of the traditional moisturizing soap.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of daily washing and caring products, in particular to a essential oil soap with moisturizing function and a preparation method thereof. BACKGROUND

[0002] As a personal care product with both cleaning and skin care functions, essential oil soap has occupied an important position in the high-end washing and caring market in recent years. Compared with traditional soaps, it adds plant essential oils, natural moisturizing agents and other functional ingredients, and has additional functions such as moisturizing while cleaning the skin, thereby meeting the needs of consumers for "washing, caring and nourishing in one". Currently, essential oil soaps on the market mainly use cold soap or hot soap process, and the base material is mainly plant oils such as olive oil and coconut oil. Some products also introduce honey, shea butter and other nourishing ingredients.

[0003] Nowadays, the formula of essential oil soap usually takes soap base and essential oil as the main components, which can provide basic cleaning and fragrance, but lacks long-term moisturizing mechanism. Especially, the alkaline environment generated by saponification reaction can easily damage the skin's natural barrier, thereby causing increased water loss. Moreover, the moisturizing ingredients added in some products will quickly dissolve when they come into contact with water, and cannot form a long-lasting water-locking film on the skin surface, making it difficult to meet the needs of dry skin or dry climate.

[0004] Therefore, in view of the above problems, the present application provides an essential oil soap with moisturizing function and a preparation method thereof. SUMMARY

[0005] In order to overcome the problem of insufficient moisturizing performance and short-term water-locking effect of essential oil soap, the present application provides an essential oil soap with moisturizing function and a preparation method thereof. Through the synergistic effect of composite plant oils, slow-release essential oils and supermolecular water-locking agents, the long-term moisturizing capacity is enhanced while maintaining the cleaning power, and the dry and uncomfortable feeling of the skin is reduced.

[0006] The technical solution of the present application is: an essential oil soap with moisturizing function, which is composed of the following raw materials in a certain weight ratio: plant oil mixture 40-70%, natural essential oil 3-10%, moisturizing active ingredient 5-15%, alkali 15-30%, supermolecular water-locking agent 1-5% and auxiliary additive 0.5-3%.

[0007] As a preferred embodiment, the plant oil mixture is composed of olive oil, shea butter and sweet almond oil in a mass ratio of (2-4):(1-3):(0.5-2).

[0008] The olive oil, shea butter and sweet almond oil are precisely compounded in a mass ratio of (2-4):(1-3):(0.5-2) to form a plant oil mixture, wherein the olive oil provides a high proportion of oleic acid to enhance the permeability of the skin, the shea butter contributes stearic acid and vitamin E to strengthen the barrier repair, and the sweet almond oil is rich in linoleic acid to promote the balance of stratum corneum lipids, and the three work synergistically through the specific ratio to form a soap base framework rich in unsaturated fatty acid sodium salt during saponification, which not only maintains the hardness of the soap body to prevent it from becoming soft and rotten, but also leaves a lipophilic moisturizing film on the skin surface after cleaning.

[0009] As a preferred, the natural essential oil is selected from at least one of rose fruit oil, lavender essential oil and orange flower essential oil, and a microencapsulated slow-release carrier is added to wrap the essential oil.

[0010] The microcapsule wall material is composed of chitosan-sodium alginate complex, and the essential oil is loaded in the microcapsule with a particle size of 5-50 μm by electrostatic layer-by-layer self-assembly technology. This structure enables the essential oil to be released by wall swelling when the soap body is used with water, and the release rate of the essential oil is controlled at 15-30% during the 30-second rubbing process, while the instantaneous release rate of the conventional non-wrapped essential oil soap is 70-90%. At the same time, microencapsulation reduces the oxidation loss rate of the essential oil to below 5% (40°C / 90 days) during the storage period of the soap body, and the retention amount of the active ingredients of the essential oil on the skin surface after washing is increased by 2-3 times, and the antioxidant and soothing effects can last for more than 4 hours.

[0011] As a preferred, the moisturizing active ingredient is a complex of sodium hyaluronate, glycerol and aloe gel, and the mass ratio of the three is (0.1-0.5):(3-8):(2-6).

[0012] Sodium hyaluronate, glycerol and aloe gel are compounded in a mass ratio of (0.1-0.5):(3-8):(2-6) to form a complex moisturizing active ingredient, wherein sodium hyaluronate forms a three-dimensional network hydration structure under the mediation of glycerol, and the polysaccharide chains in aloe gel are inserted to enhance adhesion. The specific ratio enables the complex to form a dynamic moisturizing layer when the soap body is dissolved in water.

[0013] As a preferred, the supermolecular water-locking agent is a complex of modified β-cyclodextrin and trehalose, and the mass ratio of the two is 1:(0.3-1).

[0014] The hydrophobic cavity of the modified β-cyclodextrin is used to capture water molecules to form a "water molecule bank", and the hydroxyl groups of trehalose form a three-dimensional water-locking network by bridging the edges of cyclodextrin through hydrogen bonds. The specific ratio enables the complex to dynamically bind free water in the soap body dissolution liquid to reach a peak value: when the proportion of trehalose is ≥0.3, the utilization rate of cyclodextrin cavity is increased to more than 90%, and when the proportion is ≤1, crystallization can be avoided.

[0015] As a preferred, the auxiliary additive is a compound of vitamin E acetate, oat beta-glucan and natural emulsifier, with a mass ratio of (0.1-0.8):(0.2-1):(0.3-1.5).

[0016] The vitamin E acetate is uniformly dispersed in the soap-based hydrophobic phase under the mediation of the emulsifier, and the oat beta-glucan is anchored at the soap hydrophilic interface through hydrogen bonds. The specific ratio enables the compound to form a dual-function layer in the soap body: the vitamin E acetate ≥ 0.1% can effectively inhibit lipid peroxidation, and the oat beta-glucan in the range of 0.2-1% can stabilize the soap body foaming particle size at 10-50 μm in cooperation with the emulsifier.

[0017] As a preferred, the surface of the soap body is covered with a moisturizing protective film composed of silk protein and plant polysaccharide, with a thickness of 50-200 μm.

[0018] As a preferred, the pH value of the essential oil soap is 5.5-6.8, and the retention rate of the moisturizing factor in the water-soluble liquid is > 85%.

[0019] The pH range matches the natural pH of the skin and the skin, and the retention rate of the moisturizing factor is directly related to the persistence of the post-washing effect. When the retention rate is > 85%, the trans-epidermal water loss (TEWL) of the skin can recover to the baseline level within 60 minutes after washing.

[0020] As a preferred, a preparation method of an essential oil soap with moisturizing and moisturizing functions, comprising the following steps: S1, the mixture of vegetable oil is placed in a saponification kettle with temperature control, the stirring is started and the temperature is uniformly increased to 45-50℃ melting state, the temperature range is maintained for 10 minutes until the oil phase becomes completely transparent without solid suspension, and the heating rate is controlled at 2-3℃ / min to avoid local overheating; S2, the alkali solution preheated to 40-45℃ is slowly added to the molten oil phase of step S1 by constant flow pump, the stirring speed is controlled at 200-300 rpm for the first 30 minutes to promote the initial saponification reaction, and then the temperature is lowered to 45±1℃ and the speed is increased to 400-500 rpm, the total saponification time is 2-3 hours, until the mixture becomes a uniform paste; S3, after the saponification is completed, stop heating, circulate water to cool the system to 35-40℃, then add the premixed moisturizing active ingredients and supermolecular water locking agent, stir at a speed of 1200 rpm under a vacuum of-0.08 MPa for 15 minutes, until the system becomes a semi-transparent gel state; S4, the natural essential oil and auxiliary additives are premixed at 50℃ for 5 minutes, then injected into the system in step S3, maintained at 35-40℃ and -0.1MPa vacuum, defoamed at 60rpm low speed with anchor stirrer for 20 minutes until the bubble density <5 / cm³; S5, the defoamed soap paste is injected into the mold, then transferred to a constant humidity box for curing for 48-72 hours, and finally demolded to obtain the finished product of essential oil soap.

[0021] The beneficial effects of the present application are: 1. The present application realizes the coexistence of cleaning and moisturizing functions by forming a dynamic moisturizing layer with the specific proportion of sodium hyaluronate, glycerol and aloe vera gel, so that the skin water loss rate is stably reduced within a few hours after washing, and the specific proportion of modified β-cyclodextrin and trehalose is compounded to form a "water molecule library" on the skin surface, thereby prolonging the water retention time and reducing the water loss efficiency, which is significantly higher than the short-term moisturizing effect of traditional moisturizing soap.

[0022] 2. The specific proportion of olive oil, shea butter and sweet almond oil is compounded to form a soap base framework rich in unsaturated fatty acid sodium salt after saponification, which not only maintains the hardness of the soap body, but also leaves a lipophilic moisturizing film on the skin surface after washing, solving the technical defect of dryness and tightness after traditional soap cleaning, and the rose fruit oil, lavender essential oil or orange flower essential oil is wrapped with chitosan-sodium alginate microcapsules, thereby reducing the release rate of essential oil during rubbing process, increasing the retention amount of active ingredients on the skin surface after washing, and solving the problems of easy evaporation and short-term effect of essential oil. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The preparation flowchart of the present application is shown. DETAILED DESCRIPTION

[0024] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0025] The present application provides an embodiment: an essential oil soap with moisturizing and moisturizing functions, which is composed of the following weight ratio of raw materials: plant oil mixture 40-70%, natural essential oil 3-10%, moisturizing active ingredient 5-15%, lye 15-30%, supermolecular water locking agent 1-5% and auxiliary additive 0.5-3%.

[0026] Please refer toFigure 1 Further, Example 1: The raw material composition is as follows: Plant oil mixture (olive oil: shea butter: sweet almond oil = 3:2:1) 62%, natural essential oil (microencapsulated lavender essential oil) 6%, moisturizing active ingredient (sodium hyaluronate: glycerin: aloe vera gel = 0.3%:5%:4%) 9.3%, lye (20% NaOH aqueous solution) 21%, supramolecular water-locking agent (modified β-cyclodextrin: trehalose = 1:0.6) 3%, auxiliary additive (vitamin E acetate: oat β-glucan: lecithin = 0.5%:0.6%:1%) 2.1%.

[0027] The preparation process is as follows: S1, place the plant oil mixture in a saponification kettle with temperature control, turn on the stirring and uniformly increase the temperature to 48°C to melt, maintain the temperature range for 10 minutes of continuous stirring until the oil phase becomes completely transparent without solid suspension, and the heating rate is controlled at 2-3°C / min to avoid local overheating; S2, slowly add the preheated lye to 40°C to the molten oil phase in step S1 through a constant flow pump, maintain 48±0.5°C for the first 30 minutes and control the stirring speed at 250 rpm to promote the initial saponification reaction, and then reduce the temperature to 45±0.5°C and increase the speed to 450 rpm, the total saponification time is 2.5 hours, until the mixture becomes a uniform paste; S3, after saponification, stop heating, cool the system to 38°C with circulating water, then add the pre-mixed moisturizing active ingredient and supramolecular water-locking agent, stir at 1200 rpm under a vacuum of -0.08 MPa for 15 minutes until the system becomes a semi-transparent gel; S4, pre-mix the natural essential oil and auxiliary additive at 50°C for 5 minutes, then inject into the system in step S3, maintain 35-40°C and -0.1 MPa vacuum, use an anchor stirrer at a low speed of 60 rpm to deaerate for 20 minutes until the bubble density is <3 / cm³; S5, inject the deaerated soap slurry into the mold, then transfer to a constant humidity box for 60 hours of curing, and finally demold to obtain the essential oil soap product.

[0028] The essential oil soap prepared in this example has a pH value of 6.0, a moisturizing factor retention rate of 89% under the condition of 37°C / 24h, a trans-epidermal water loss (TEWL) of 14.2 g / m²·h after 1 hour of washing, a skin hydration degree of 48 μS, a soap body hardness of 5.3 kg / cm², and a foaming particle size of 28 μm.

[0029] Further, Example 2: The raw material composition is as follows: Plant oil mixture (olive oil: shea butter: sweet almond oil = 2: 1: 0.5) 45%, natural essential oil (microencapsulated lavender essential oil) 6%, moisturizing active ingredients (sodium hyaluronate: glycerin: aloe vera gel = 0.1%: 3%: 2%) 5.1%, lye (20% NaOH aqueous solution) 21%, supramolecular water-locking agent (modified β-cyclodextrin: trehalose = 1: 0.3) 1.3%, auxiliary additives (vitamin E acetate: oat β-glucan: lecithin = 0.1%: 0.2%: 0.3%) 0.6%.

[0030] The preparation process is as follows: S1, the plant oil mixture is placed in a saponification kettle with temperature control, the stirring is started and the temperature is uniformly raised to 48°C to melt, the temperature range is maintained for 10 minutes of continuous stirring until the oil phase becomes completely transparent without solid suspension, and the heating rate is controlled at 2-3°C / min to avoid local overheating; S2, the lye preheated to 40°C is slowly added to the molten oil phase of step S1 by a constant flow pump, the first 30 minutes are maintained at 48±0.5°C and the stirring speed is controlled at 250 rpm to promote the initial saponification reaction, and the subsequent stage is cooled to 45±0.5°C and the speed is increased to 450 rpm, the total saponification time is 2 hours, until the mixture becomes a uniform paste; S3, after the saponification is completed, the heating is stopped, the system is cooled to 38°C by circulating water, then the pre-mixed moisturizing active ingredients and supramolecular water-locking agent are added, and the stirring is carried out at a speed of 1200 rpm under a vacuum degree of -0.08 MPa for 15 minutes, until the system becomes a semi-transparent gel state; S4, the natural essential oil and auxiliary additives are pre-mixed at 50°C for 5 minutes, then injected into the system in step S3, maintained at 35-40°C and -0.1 MPa vacuum, and the anchor stirrer is used at a low speed of 60 rpm to defoam for 20 minutes, until the bubble density is <5 / cm³; S5, the saponified paste after defoaming is injected into the mold, then transferred to a constant humidity box for curing for 72 hours, and finally the essential oil soap product is obtained by demolding.

[0031] The essential oil soap prepared in this example has a pH value of 5.8, a moisturizing factor retention rate of 86% under the condition of 37°C / 24h, a trans-epidermal water loss (TEWL) of 16.8 g / m²·h after 1 hour of washing, a skin hydration degree of 42 μS, a soap body hardness of 4.1 kg / cm², and a foaming particle size of 35 μm.

[0032] Further, Example 3: The raw material composition is as follows: Plant oil mixture (olive oil: shea butter: sweet almond oil = 2: 1: 0.5) 45%, natural essential oil (microencapsulated rosehip oil) 10%, moisturizing active ingredients (sodium hyaluronate: glycerin: aloe vera gel = 0.5%: 8%: 6%) 14.5%, lye (20% NaOH aqueous solution) 21%, supermolecular water-locking agent (modified β-cyclodextrin: trehalose = 1: 1) 5%, auxiliary additives (vitamin E acetate: oat β-glucan: lecithin = 0.1%: 0.2%: 0.3%) 0.6%.

[0033] The preparation process is as follows: S1, the plant oil mixture is placed in a saponification kettle with temperature control, the stirring is started and the temperature is uniformly raised to 48°C to melt, the temperature range is maintained for 10 minutes of continuous stirring until the oil phase becomes completely transparent without solid suspension, and the heating rate is controlled at 2-3°C / min to avoid local overheating; S2, the lye preheated to 40°C is slowly added to the molten oil phase of step S1 by a constant flow pump, the initial saponification reaction is promoted by maintaining 48±1°C for the first 30 minutes and controlling the stirring speed at 250rpm, and the temperature is lowered to 45±1°C in the subsequent stage and the speed is increased to 450rpm, the total saponification time is 2.5 hours, until the mixture becomes a uniform paste; S3, after the saponification is completed, the heating is stopped, the system is cooled to 38°C by circulating water, then the pre-mixed moisturizing active ingredients and supermolecular water-locking agent are added, and the stirring is carried out at a speed of 1500rpm under a vacuum degree of-0.08MPa for 15 minutes until the system becomes a semi-transparent gel state; S4, the natural essential oil and auxiliary additives are pre-mixed at 50°C for 5 minutes, then injected into the system of step S3, maintained at 35-40°C and-0.1MPa vacuum, and defoamed at a low speed of 60rpm by an anchor stirrer for 30 minutes until the bubble density is <3 / cm³; S5, the saponified paste after defoaming is injected into a mold, then transferred to a constant humidity box for curing for 60 hours, and finally demolded to obtain the essential oil soap product.

[0034] The pH value of the essential oil soap prepared in this example is 6.5, the moisturizing factor retention rate is 92% under the condition of 37°C / 24h, the trans-epidermal water loss (TEWL) is 12.3g / m²·h after 1 hour of washing, and the essential oil oxidation loss rate is 3.8% after 90 days in an environment of 40°C.

[0035] Further, Comparative Example 1: The raw material composition is as follows: Olive oil 70%, natural essential oil 6%, moisturizing active ingredients (sodium hyaluronate: glycerin: aloe gel = 0.3%: 5%: 4%) 9.3%, lye (20% NaOH aqueous solution) 21%, auxiliary additives (vitamin E acetate: oat beta-glucan: lecithin = 0.5%: 0.6%: 1%) 2.1%.

[0036] The plant oil of the present comparative example only uses single olive oil, deletes the shea butter and sweet almond oil complex system, directly adds 6% lavender essential oil, does not perform microencapsulation, and completely deletes the supramolecular water locking agent.

[0037] The moisture factor retention rate of the essential oil soap prepared in the present comparative example is only 32% under the condition of 37℃ / 24h, the trans-epidermal water loss (TEWL) after washing for 1 hour is 35g / m2·h, and the essential oil oxidation loss rate is 78% after 30 days in an environment of 40℃.

[0038] The above is only a preferred embodiment of the present application, and does not limit the present application in other forms. Any person skilled in the art can use the disclosed technical content to make changes or modifications to equivalent embodiments applied to other fields, but any simple modification, equivalent change and modification made to the above embodiments without departing from the technical solution content of the present application, according to the technical essence of the present application, still belongs to the protection scope of the technical solution of the present application.

Claims

1. An essential oil soap with moisturizing function, characterized in that, The soap is made of the following raw materials in the following proportions: a mixture of vegetable fats and oils 40-70%, natural essential oils 3-10%, moisturizing active ingredients 5-15%, lye 15-30%, super-molecular water-locking agent 1-5%, and auxiliary additives 0.5-3%.

2. The essential oil soap having a moisturizing function according to claim 1, characterized in that: The mixture of vegetable fats and oils is composed of olive oil, shea butter and sweet almond oil in a mass ratio of (2-4):(1-3):(0.5-2).

3. The essential oil soap having a moisturizing function according to claim 1, characterized in that: The natural essential oils are selected from at least one of rose fruit oil, lavender essential oil and orange flower essential oil, and the essential oils are wrapped with a microencapsulated sustained-release carrier.

4. The essential oil soap having a moisturizing function according to claim 1, wherein the essential oil is selected from the group consisting of lavender, rosemary, tea tree, eucalyptus, lemon, orange, grapefruit, and peppermint. The moisturizing active ingredients are a compound of sodium hyaluronate, glycerol and aloe vera gel in a mass ratio of (0.1-0.5):(3-8):(2-6).

5. The essential oil soap having a moisturizing function according to claim 1, wherein the essential oil is selected from the group consisting of lavender, rosemary, tea tree, eucalyptus, lemon, orange, grapefruit, and peppermint. The super-molecular water-locking agent is a compound of modified β-cyclodextrin and trehalose in a mass ratio of 1:(0.3-1).

6. The essential oil soap having a moisturizing function according to claim 1, wherein the essential oil is selected from the group consisting of lavender, rosemary, tea tree, eucalyptus, lemon, orange, grapefruit, and peppermint. The auxiliary additives are a compound of vitamin E acetate, oat β-glucan and natural emulsifier in a mass ratio of (0.1-0.8):(0.2-1):(0.3-1.5).

7. The essential oil soap having a moisturizing function according to claim 1, wherein the essential oil is selected from the group consisting of lavender, rosemary, tea tree, eucalyptus, lemon, orange, grapefruit, and peppermint. The surface of the soap body is covered with a moisturizing protective film composed of silk fibroin and plant polysaccharide, with a thickness of 50-200 μm.

8. The essential oil soap having a moisturizing function according to claim 1, wherein the essential oil is selected from the group consisting of lavender, rosemary, tea tree, eucalyptus, lemon, orange, grapefruit, and peppermint. The pH value of the essential oil soap is 5.5-6.8, and the retention rate of moisturizing factors in the water-soluble liquid is > 85%.

9. A method for preparing an essential oil soap having a moisturizing function, using the essential oil soap having a moisturizing function according to any one of claims 1 to 8, characterized in that, The method comprises the following steps: S1, melt the mixture of vegetable fats and oils to 45-50℃ to form an oil phase; S2, slowly add the lye to the oil phase, and stir for 2-3 hours under the condition of less than 50℃; S3, after saponification, cool to 35-40℃, and homogeneously mix the moisturizing active ingredients and the super-molecular water-locking agent; S4, pre-mix the natural essential oils and the auxiliary additives, and then add them to the system of step S3, and vacuum stir to remove bubbles; S5, pour into a mold, and mature in a constant humidity environment of 25-30℃ for 48-72 hours.

10. The method of claim 9, wherein the method further comprises adding the essential oil and the moisturizing agent to the soap base. The step S2 adopts a staged temperature control process, specifically including: maintaining 48±1℃ for the first 30 minutes, and then reducing to 45±1℃ in the subsequent stage.

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