A composition containing natural surfactants, and a method for preparing and using the same

Abstract

The application belongs to the technical field of daily chemical products, and discloses a composition containing natural surfactants and a preparation method and application thereof. The composition comprises lauroyl / myristoyl methyl glucamide, glycolipid and decyl glucoside. The composition provided by the application contains natural surfactants, can solve the problem that decyl glucoside is easy to precipitate, widens the use range of decyl glucoside, can be added in products with different pH values, and can increase the use amount. When the composition is applied to skin cleaning products, the product has abundant foam, is mild in nature, is mild and non-irritating to the skin, has the properties of moisturizing, antibacterial and antioxidation, brings soft and fresh skin feeling to the skin, and is suitable for people with sensitive skin.

Description

Technical Field

[0001] This invention belongs to the field of daily chemical products technology, and specifically relates to a composition containing natural surfactants, its preparation method and application. Background Technology

[0002] There are many reasons for sensitive skin, such as oxidative stress caused by sun exposure, UV radiation, seasonal and temperature changes, dust or dirt, and chemicals in the air; improper use of cleansing products; damage to the skin barrier function caused by skin irritants, medications, and antibiotics; insufficient sleep; high stress; and lifestyle changes. Cleansing products are substances we frequently come into contact with, and the mildness of their surfactants directly affects their irritation levels.

[0003] Currently, there is a wide variety of skin cleansing products available. Some are based on soap, which, while producing rich lather and strong cleaning power, often have excessive degreasing properties, leaving skin feeling tight and unsuitable for sensitive skin. Other products primarily use simple surfactants, which are gentler, but their cleansing effect may be less than ideal. With increasing societal emphasis on environmental protection, green living, and sustainable lifestyles, consumers are increasingly opting for cleansing products that are naturally sourced, environmentally friendly, and sustainable. This trend has prompted the daily chemical industry to continuously explore and develop new surfactants to meet market demand for gentle, low-irritant cleansing products. Developing skin cleansing products that are both gentle and effective is particularly important for the growing population with sensitive skin. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention provides a composition containing natural surfactants, a method for preparing the same, and its application. This composition contains naturally derived surfactants, and when applied to skin cleansing products, the products produce rich foam, are mild in nature, and are gentle and non-irritating to the skin, making them suitable for people with sensitive skin.

[0005] A first aspect of the present invention provides a composition comprising lauroyl / myristoyl methyl glucamide, glycolipid, and decyl glucosinolate.

[0006] Specifically, lauroyl / myristoyl methyl glucamide is a glycosyl green surfactant obtained by hydrogenation, dehydration, and amidation of glucose; glycolipid is rhamnolipid, a glycolipid biosurfactant derived from Pseudomonas fermentation; and decyl glucoside is a biosurfactant formed by the ester bond between decylane and glucose.

[0007] The sugar-derived surfactant lauroyl / myristoyl methyl glucoamide in the composition of this invention exhibits excellent cleansing and foam-forming properties. It can be compounded with decyl glucoside for a synergistic effect on foam, providing richer, denser, and more stable foam. It also possesses excellent gentleness, preventing excessive washing of the skin and protecting the skin barrier. Furthermore, lauroyl / myristoyl methyl glucoamide has good thickening properties, allowing the desired product formulation viscosity to be achieved with reduced amounts of sodium chloride or emulsifying thickeners. For example, some facial cleansing product systems that use sodium chloride for thickening can achieve the required viscosity without sodium chloride, or even achieve a higher viscosity than with sodium chloride thickening, thereby reducing costs while maintaining product gentleness. Glycolipids are biosurfactants with good skin affinity, possessing moisturizing, antibacterial, and antioxidant properties, providing a soft and refreshing skin feel. The compounding of lauroyl / myristoyl methyl glucoamide, glycolipids, and decyl glucoside makes the composition of this invention gentler, more stable, produces richer foam, and is less irritating.

[0008] In some embodiments of the present invention, the composition comprises, by weight parts, 0.2-15 parts lauroyl / myristoyl methyl glucamide, 0.5-40 parts glycolipid, and 0.5-45 parts decyl glucoside.

[0009] In some embodiments of the present invention, the composition comprises, by weight parts, 0.2-10 parts lauroyl / myristoyl methyl glucamide, 0.5-25 parts glycolipid, and 0.5-30 parts decyl glucoside.

[0010] A second aspect of the present invention provides a method for preparing the composition described in the first aspect of the present invention, comprising the following steps:

[0011] Decyl glucoside was mixed with glycolipid, stirred, heated, and then lauroyl / myristoyl methyl glucoamide was added and stirred to obtain the composition.

[0012] In some embodiments of the present invention, the heating temperature is 35-45°C.

[0013] A third aspect of the invention provides the use of the composition described in the first aspect of the invention in the preparation of skin cleansing products.

[0014] A fourth aspect of the present invention provides a skin cleansing product comprising the composition described in the first aspect of the present invention.

[0015] In some embodiments of the present invention, the composition is present in a skin cleansing product at a content of 1-80 wt%, preferably 10-80 wt%, and more preferably 20-60 wt%.

[0016] In some embodiments of the present invention, the lauroyl / myristoyl methyl glucoamide is present in the skin cleansing product at a content of 0.2-15 wt%, preferably 0.2-10 wt%, and more preferably 3-7 wt%.

[0017] In some embodiments of the present invention, the glycolipid content in the skin cleansing product is 0.5-40 wt%, preferably 0.5-25 wt%, and more preferably 8-15 wt%.

[0018] In some embodiments of the present invention, the decyl glucoside is present in the skin cleansing product at a content of 0.5-45 wt%, preferably 0.5-30 wt%, and more preferably 15-30 wt%.

[0019] In some embodiments of the present invention, the skin cleansing product further includes excipients, which include at least one of chelating agents, thickeners, emollients, emulsifiers, preservatives, and skin protectants.

[0020] In some embodiments of the present invention, the skin cleansing product includes facial cleanser, cleansing lotion, cleansing cream, cleansing gel, cleansing mousse, shower gel, or shampoo.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. The lauroyl / myristoyl methyl glucamide, glycolipid, and decyl glucoside in the composition of this invention are derived from natural, green, and biodegradable sources, which is in line with the concept of sustainable development.

[0023] 2. Decyl glucoside, when added directly to a product, easily precipitates particulate matter under low temperature (< -5℃) or pH ≥ 8.0 conditions. This greatly limits its addition amount in transparent wash-off products (usually less than 5 wt%, as higher addition amounts easily lead to precipitation). However, this invention effectively solves this problem by combining it with lauroyl / myristoyl methyl glucoside and glycolipids. The composition of this invention did not precipitate any particles in high and low temperature tests and tests at different pH ranges, thus broadening the application range of decyl glucoside. It can be added to products with different pH values ​​and its usage amount can be increased.

[0024] 3. Compared to soap-based cleansing products, the composition of this invention is gentle and non-irritating, suitable for sensitive skin; compared to pure amino acid surfactant products which are difficult to thicken and have insufficient cleansing power, the composition of this invention produces richer and more stable foam, has excellent cleansing power, and has a built-in thickening effect; compared to other general surfactant products, the composition of this invention has good affinity with the skin, has moisturizing, antibacterial and antioxidant properties, and brings a soft and refreshing skin feel.

[0025] 4. The composition of the present invention has strong versatility and is suitable for different skin groups, such as: cleansing products for people with sensitive skin, cleansing products for children, cleansing products for pregnant and postpartum women, etc.

[0026] 5. The preparation method of the composition of the present invention is simple to operate, the process is stable, and it can be widely promoted and applied. Detailed Implementation

[0027] To enable those skilled in the art to more clearly understand the technical solutions described in this invention, the following embodiments are provided for illustration. It should be noted that the following embodiments do not constitute a limitation on the scope of protection claimed by this invention.

[0028] Unless otherwise specified, the raw materials, reagents or devices used in this invention can be obtained from conventional commercial sources or by existing known methods.

[0029] Example 1

[0030] A composition containing a natural surfactant and the preparation of a facial cleansing mousse.

[0031] A composition containing a natural surfactant includes lauroyl / myristoyl methyl glucamide, glycolipid, and decyl glucoside; the composition is prepared by adding glycolipid to decyl glucoside, stirring until homogeneous, heating to 40°C, then slowly adding lauroyl / myristoyl methyl glucamide, stirring for 20 min to obtain the composition.

[0032] A facial cleansing mousse comprising the above-described composition, water, EDTA-2Na, glycerin, PEG-75 shea butter glycerides, citric acid, p-hydroxyacetophenone, 1,2-hexanediol, and phenoxyethanol.

[0033] Examples 1-5 all provide a cleansing mousse, the difference being the different contents of the raw material components, as shown in Table 1.

[0034] Table 1 Cleansing Mousse Formula

[0035]

[0036]

[0037] Note: "QS" in the table means appropriate quantity.

[0038] The preparation method of the cleansing mousse in Examples 1-5 includes the following steps:

[0039] (1) Dissolve the C phase to make it transparent beforehand;

[0040] (2) Add phase A into the reaction vessel in sequence, and heat to 70°C while stirring. After stirring until the mixture is evenly dissolved, start cooling.

[0041] (3) When the temperature drops to 60℃, add phase B and stir until homogeneous;

[0042] (4) When the temperature drops to 50℃, add phase C and stir until homogeneous for 30 minutes.

[0043] (5) When the temperature drops to 40°C, add phase D and stir until the paste is uniform and transparent;

[0044] (6) When the temperature drops to 38°C, the material can be defoamed and discharged.

[0045] Comparative Examples 1-5 all provide a cleansing mousse, prepared using the same method as the examples, except for the different types of raw material components, as shown in Table 2.

[0046] Table 2 Cleansing Mousse Formula

[0047]

[0048] Note: " / " in the table indicates that it does not contain.

[0049] Product effectiveness test

[0050] Test Example 1: Product Stability Test

[0051] 1.1: High and Low Temperature Stability Test

[0052] The cleansing mousses prepared in Examples 1-5 and Comparative Examples 1-5 were used as test samples. The heat resistance and cold resistance of the samples were tested using the high and low temperature cycling test method according to GB / T29680. The cold resistance temperatures were (-15±2)℃ and (-8±2)℃, the heat resistance temperatures were (48±1)℃ and (40±1)℃, and the room temperature was (25±2)℃. The stability of the products was observed at 24h, 3 days, 7 days, 14 days, 28 days, 45 days, 60 days, 90 days, and 120 days. The specific stability test results are shown in Table 3 below.

[0053] Table 3. Results of sample stability tests at different temperatures

[0054]

[0055] Table 3 shows that the cleansing mousses prepared in Examples 1-5 and Comparative Example 2 were relatively stable for 120 days under both high and low temperatures. The cleansing mousses prepared in Comparative Examples 1, 3, 4, and 5 showed varying degrees of solid or flocculent precipitation at different times under low temperatures. The solid precipitation observed at low temperatures in Comparative Examples 1, 3, and 4 indicates that the decyl glucoside transparent system is prone to solid precipitation in the absence of lauroyl / myristoyl methyl glucoside and / or glycolipids. In contrast, the decyl glucosides in Examples 1-5 were all formulated with lauroyl / myristoyl methyl glucoside and glycolipids, resulting in better stability under both high and low temperatures. Comparative Example 2 passed the high and low temperature stability tests because its formulation did not contain decyl glucoside, thus having no impact on product stability. The flocculent precipitation in Comparative Example 5 is suspected to be due to the high content of sodium cocoyl methyl taurate in the formulation, leading to precipitation at lower temperatures.

[0056] Therefore, it can be seen that the present invention can make decyl glucoside more stable in the system by combining lauroyl / myristoyl methyl glucoamide, glycolipid and decyl glucoside.

[0057] 1.2: Stability test at different pH values

[0058] The cleansing mousses prepared in Examples 1-5 and Comparative Examples 1-5 were used as test samples to observe the stability of the samples at different pH values. The specific stability test results are shown in Table 4 below.

[0059] Table 4. Results of sample stability tests at different pH values

[0060]

[0061]

[0062] Table 4 shows that Examples 1-5 are stable within a pH range of 5-10, with transparent systems and no precipitation. Comparative Examples 2 and 5 are stable and transparent within a pH range of 5-10 because decyl glucoside was not added, thus eliminating the precipitation issue. Comparative Examples 1, 3, and 4, due to the addition of different amounts of decyl glucoside and the absence of lauroyl / myristoyl methyl glucoamide and glycolipid, exhibited varying degrees of precipitation at different pH levels, resulting in opaque systems. Therefore, this invention, by combining lauroyl / myristoyl methyl glucoamide, glycolipid, and decyl glucoside, makes decyl glucoside more stable in different pH systems, broadening its application range in various systems.

[0063] Test Example 2: Skin Irritation Test

[0064] Two hundred healthy volunteers aged 20-50 years (male or female) were selected and divided into 10 groups of 20 each. The cleansing mousses prepared in Examples 1-5 and Comparative Examples 1-5 were used in each group. 0.03 mL of the test sample was placed in the drug chamber of a patch test tape. Immediately afterward, the patch test tape containing the sample was applied longitudinally from the bottom to the normal skin of the subject's left forearm. The drug chambers were gently pressed to remove air and ensure even distribution of the test substance. The test sites were marked for observation. The patch tape was removed after 24 hours, and skin condition was observed at 0.5 hours, 24 hours, and 48 hours. Skin reactions were recorded and analyzed according to the CTFA guidelines. The blank control group underwent the same test on the right upper arm of the volunteers using deionized water. The identification criteria are shown in Table 5, and the test results are shown in Table 6.

[0065] Table 5. Criteria for Skin Irritation Testing

[0066]

[0067]

[0068] Table 6 Results of Skin Irritation Tests

[0069]

[0070]

[0071] As shown in Table 6, volunteers who used the cleansing mousse prepared in Comparative Examples 1-5 experienced varying degrees of skin reactions, while volunteers who used the cleansing mousse prepared in Examples 1-5 had no adverse reactions. This indicates that the surfactant combination in the formulations of the present invention is milder, non-irritating, and has good safety.

[0072] Therefore, it can be seen that the surfactant combination of lauroyl / myristoyl methyl glucoamide, glycolipid and decyl glucoside in this invention has a synergistic effect and is less irritating to the skin.

[0073] Experimental Example 3: Foam Richness Test

[0074] The cleansing mousses prepared in Examples 1-5 and Comparative Examples 1-5 were used as test samples. The richness of the foam in the samples was tested using a SITA foam analyzer. The unique foam generating blades of the SITA foam analyzer can control the amount of air drawn in, reproducing the foam formation process. Combined with the measurement system, the foam can be objectively evaluated. The sample was prepared into a 0.15% test solution using 150 ppm hard water. The test liquid was then poured into the sample tank of the SITA foam analyzer. The rotation speed was set to 900 rpm, the time to 1 hour, and the sample temperature to 40°C. The SITA foam analyzer was then started, and the foam analyzer automatically recorded the change in foam volume. The specific test results are shown in Table 7 below.

[0075] Table 7 Statistical results of foam volume in samples

[0076]

[0077]

[0078] Table 7 shows that the cleansing mousses prepared in Examples 1-5, compared to Comparative Examples 1-5, exhibited higher foam volume at 30s, 3min, 5min, and 1h, indicating that the cleansing mousses prepared in the Examples had a faster foaming speed, richer foam, and a longer foaming time. Comparative Examples 4 and 5, due to their main surfactant being sodium cocoyl methyl taurate, also had relatively fast foaming speeds, but their foaming time was shorter than that of the Examples, and they defoamed more quickly. The formulations of Comparative Examples 1-3 involved compounding one or two of lauroyl / myristoyl methyl glucoamide, glycolipids, and decyl glucoside with amino acid surfactants. Their foaming speed, foam volume, and foaming time were not as good as the Examples, indicating that the compounding of lauroyl / myristoyl methyl glucoamide, glycolipids, and decyl glucoside had a synergistic effect on foam, providing richer and more stable foam.

[0079] Experimental Example 4: Skin Moisture Content Test

[0080] A skin moisture meter can be used to test the moisturizing effect of a sample. It employs bioelectrical impedance analysis (BIA) technology, using a microcomputer to precisely measure and calculate the skin's moisture level. It primarily uses the capacitance principle, determining skin hydration based on the difference in dielectric constants between water and other substances. Under normal circumstances, water has a dielectric constant of 81, while most other substances have dielectric constants less than 7. This means the capacitance changes with the skin's capacitance, which falls within the measurement range, making it easy to determine skin hydration.

[0081] The specific method was as follows: 200 healthy volunteers aged 20-50 (male or female) were selected and divided into 10 groups of 20 each. Each group used the cleansing mousse prepared in Examples 1-5 and Comparative Examples 1-5, respectively. The subjects washed the inside of their forearms, sat quietly for 30 minutes in a controlled temperature and humidity environment, and then drew 3×3cm marks on the inside of their forearms. 2 In the blank control group and the product application group, the moisture content of the designated area was measured three times in parallel using a Corneometer skin moisture meter, and the average value was taken as the initial value of moisture content. Using latex gloves, (2.0±0.1g) / cm² was evenly applied to the test area. 2 The test samples were massaged for approximately 3 minutes and then rinsed thoroughly with water. The moisture content of the blank control group and the product application group was measured at different time points. Each area was measured at least three times in parallel, and the data were recorded. Hydration rate = (test value - blank value) / blank value × 100%. The test results are shown in Table 8.

[0082] Table 8. Average skin hydration rate (%) of volunteers at different time intervals.

[0083]

[0084] As shown in Table 8, after 8 hours of using the cleansing mousse prepared in Examples 1-5, the subjects' skin still maintained a high moisture content without applying other skin care products, with an average hydration rate of over 40%. This indicates that the combination of lauroyl / myristoyl methyl glucoamide, glycolipid, and decyl glucoside has good affinity and a good moisturizing effect.

[0085] Experiment Example 5: Consumer Testing

[0086] Two hundred healthy volunteers aged 20-50 (male or female) were selected and divided into 10 groups of 20 each. Each group used the cleansing mousse prepared in Examples 1-5 and Comparative Examples 1-5, respectively. Participants used an appropriate amount of the sample morning and evening for one month. A single-blind method was used. After the test, a questionnaire was used to evaluate the skin condition and preference after sample use. The results are shown in Table 9.

[0087] Table 9. Consumer Test Evaluation Results of Samples

[0088]

[0089] As shown in Table 9, the cleansing mousses prepared in Examples 1-5 have good cleansing power, leaving the skin feeling refreshed, gentle, and non-irritating after washing. This indicates that the combination of lauroyl / myristoyl methyl glucoamide, glycolipid, and decyl glucoside not only has excellent cleansing power but also good skin affinity, is gentle and non-irritating, and brings a soft and refreshing skin feel.

[0090] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A transparent skin cleansing product, characterized in that, Including lauroyl / myristoyl methyl glucamide, rhamnolipid, and decyl glucoside; The lauroyl / myristoyl methyl glucoamide is present in the transparent skin cleansing product at a concentration of 3-7 wt%. The rhamnolipin content in the transparent skin cleansing product is 8-15 wt%. The content of the decyl glucoside in the transparent skin cleansing product is 15-30 wt%.

2. The transparent skin cleansing product according to claim 1, characterized in that, The transparent skin cleansing product also includes excipients, which include at least one of chelating agents, thickeners, emulsifiers, preservatives, and skin protectants.

3. The transparent skin cleansing product according to claim 1, characterized in that, The transparent skin cleansing products are facial cleansers, cleansing lotions, cleansing creams, cleansing gels, cleansing mousses, or shower gels.

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