Mild amino acid composition without irritation to eyes and application of mild amino acid composition

Abstract

The invention discloses a mild amino acid composition without irritation to eyes and application of the mild amino acid composition. The mild amino acid composition comprises a first surfactant and a second thickening active agent, the first surface active agent is prepared from disodium cocoamphodiacetate, sodium cocoyl aminopropionate and sodium methyl cocoyl taurate; the first surface active agent is prepared from sodium cocoamphodiacetate, sodium cocoyl aminopropionate and sodium methyl cocoyl taurate. The second thickening active agent is prepared from cocamidopropyl betaine and guar gum hydroxypropyl trimethyl ammonium chloride. Tests prove that the mild amino acid composition is mild in performance and has excellent detergency and hard water resistance.

Description

Technical Field

[0001] This invention relates to the field of cosmetics, specifically to a mild amino acid composition that is non-irritating to the eyes and its application. Background Technology

[0002] In the personal care and baby care sector, the gentleness of a product, especially its resistance to eye and mucous membrane irritation, is a core indicator of its safety and user experience. Traditional shampoos, body washes, and other cleaning products often use sulfate-based anionic surfactants (such as sodium lauryl ether sulfate, SLES; sodium lauryl sulfate, SLS). While these products have excellent foaming and detergency capabilities, their high critical micelle concentration (CMC) and strong degreasing properties can easily damage the skin barrier and cause stinging, burning, or even corneal damage when in contact with the eyes, leading to a significant decline in the consumer experience. This problem is particularly prominent among infants and young children—their skin has a thin stratum corneum, weak pH buffering capacity, and low tear secretion, making them more sensitive to irritants. Therefore, "non-irritating to the eyes" has become a key claim for high-end baby care products.

[0003] To address these pain points, the industry is gradually shifting towards developing new surfactant systems that are low in irritation and highly biocompatible. Among them, amino acid-based surfactants have become the mainstream choice for mild hair care formulas due to their excellent gentleness, good cleaning power, and natural origin.

[0004] From a mechanistic perspective, the mildness of amino acid surfactants stems from the similarity of their molecular structure to human epidermal proteins. Their hydrophilic groups carry a negative charge but have a low charge density, resulting in weak interaction with skin / eye surface cell membranes and reducing the likelihood of protein denaturation or cell membrane rupture. Simultaneously, their high critical micelle concentration allows them to effectively reduce surface tension even at low concentrations, minimizing excessive stripping of the sebum film. However, current technologies still have certain limitations. First, amino acid surfactants are expensive, approximately 3–5 times more expensive than SLES, limiting their widespread adoption in the mass market. Second, their detergency and hard water resistance are inferior to sulfates, leading to a significant decrease in cleaning efficiency in high-oil or hard water environments. Furthermore, some amino acid surfactants exhibit poor stability under extreme pH or high-temperature conditions, requiring formulation optimization for control.

[0005] In the prior art, several technical solutions involving the compounding of amino acid surfactants have been disclosed. For example, Chinese patent document CN109303728A discloses a "Peptide Cleansing Honey and its Preparation Method". This cleansing honey uses a compound of multiple surfactants, including cocamidopropyl betaine, sodium lauroyl sarcosinate, disodium cocoamphodiacetate, and disodium lauroyl glutamate, aiming to achieve gentle cleansing and suitability for sensitive skin. Although this technical solution also focuses on the gentleness of the product, its composition differs significantly from that of this application: the patent uses sodium lauroyl sarcosinate and disodium lauroyl glutamate as the core amino acid surfactants and adds traditional sulfate surfactants such as sodium laureth sulfate (sodium lauryl ether sulfate). As is well known, although sulfate surfactants have good foaming and cleaning power, their strong degreasing and high irritation are inherent defects, especially in terms of eye safety. Therefore, while pursuing gentleness, this technical solution still does not completely eliminate the use of traditional irritating surfactants, making it difficult to achieve a truly "non-irritating to the eyes" effect.

[0006] Through long-term research in the field of washing and care, the inventors of this invention have developed a mild amino acid composition that is non-irritating to the eyes and its application. Tests have proven that it is mild in nature and has both excellent detergency and hard water resistance, thus completing this invention. Summary of the Invention

[0007] Based on this, one or more embodiments of this application provide a mild amino acid composition that is non-irritating to the eyes and its application. The mild amino acid composition of this application focuses on low irritation to the eyes and good detergency, including cleaning ability under hard water conditions.

[0008] The technical solution of the present invention includes the following contents: A mild amino acid composition comprising, by weight, 3.4-8 parts of a first surfactant and 2.1-4.3 parts of a second thickening agent; The first surfactant includes disodium cocoamphodiacetate, sodium cocoaminopropionate, and sodium methylcocoyl taurate.

[0009] The first surfactant system, through scientific formulation, particularly the introduction of amino acid surfactants, achieves a balance between gentle cleaning and excellent foaming performance: rapid foaming, dense and delicate foam, strong resistance to hard water, and long-lasting foam stability. Notably, the dense and long-lasting foam reduces the surfactant concentration per unit area of ​​skin contact while maintaining cleaning power, and also reduces the risk of foam flowing into the eyes during rinsing, thereby further enhancing the overall gentleness and comfort of the formula.

[0010] In one embodiment, the first surfactant comprises disodium cocoamphodiacetate, sodium cocoaminopropionate, and sodium methylcocoyl taurate in a weight ratio of (1-3):(2-4):(0.4-1).

[0011] The second thickening activator includes cocamidopropyl betaine and guar hydroxypropyltrimethylammonium chloride.

[0012] The second thickening surfactant, through proper formulation, further enhances the cleaning power of the system while giving the product an appropriate consistency. Rich foam and moderate viscosity not only improve the product's sensory texture but also allow consumers to intuitively perceive "effective cleaning" and "ample contents," thereby increasing their confidence and compliance.

[0013] In one embodiment, the second thickening activator comprises cocamidopropyl betaine and guar hydroxypropyltrimethylammonium chloride in a weight ratio of (2-4):(0.1-0.3).

[0014] The present invention also provides a skin cleanser for children, comprising the above-described mild amino acid composition, a pH adjuster, a preservative, and water.

[0015] The pH adjuster described in this invention can be one or a mixture of more than one of citric acid, lactic acid, malic acid, tartaric acid, phosphoric acid, sodium dihydrogen phosphate, disodium hydrogen phosphate, hydrochloric acid, and glycolic acid. In one embodiment, the pH adjuster is citric acid.

[0016] The preservative described in this invention may be one or a mixture of more than one of phenoxyethanol, sodium benzoate, benzoic acid, sorbic acid, potassium sorbate, 1,2-hexanediol, 1,2-pentanediol, octyl glycol, and ethylhexylglycerin. In one embodiment, the preservative is a mixture of phenoxyethanol and sodium benzoate.

[0017] In one embodiment, the children's skin cleanser further includes theanine microemulsion.

[0018] This invention discloses a method for preparing the theanine microemulsion, comprising the following steps: S1. Weigh out the following components in the indicated mass parts: PEG-120 methyl glucoside 0.1-0.8 parts, trimethylolpropane trioctanoate / tridecanoate 0.1-0.3 parts, phytosterol oleate 0.02-0.2 parts, theanine 0.1-1 parts, hydrogenated lecithin 0.1-0.5 parts, and water 10-20 parts.

[0019] S2. Mix PEG-120 methyl glucoside, trimethylolpropane trioctanoate / tridecanoate, and phytosterol oleate, and heat to dissolve to obtain the oil phase; mix theanine, hydrogenated lecithin, and water, and heat to 85 degrees Celsius to obtain the aqueous phase; mix the two phases and homogenize at 30 Hz for 30 minutes to obtain the colostrum; then treat the colostrum twice with a high-pressure microfluidic jet at 150 MPa.

[0020] The children's skin cleanser described in this application uses the aforementioned mild amino acid surfactant composition as its core, supplemented with necessary ingredients such as pH adjusters and preservatives, and can be flexibly added with functional components such as theanine microemulsion. All components have good compatibility with the amino acid system, do not cause adverse reactions, and do not affect the overall cleansing efficacy. In particular, the theanine microemulsion has both emollient and anti-inflammatory soothing effects, forming a thin protective film on the skin surface, effectively reducing direct contact between surfactants and the skin, thereby significantly reducing skin irritation, especially in the eye area, further enhancing the overall gentleness and safety of the product, and better meeting the needs of children's delicate skin. Detailed Implementation

[0021] The embodiments described in this specification are for illustrative purposes only and do not limit the scope of protection of this invention. The scope of protection of this invention is defined only by the claims, and any omissions, substitutions, or modifications made based on the embodiments disclosed in this invention will fall within the scope of protection of this invention.

[0022] As used herein, the terms “prepared from” and “comprising” are synonymous. The terms “comprising,” “including,” “having,” “containing,” or any other variations thereof, as used herein, are intended to cover non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that includes the listed elements is not necessarily limited to those elements, but may include other elements not expressly listed or elements inherent to such composition, step, method, article, or apparatus.

[0023] When a quantity, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pair of any upper or preferred value with any lower or preferred value, regardless of whether the range is disclosed individually. For example, when the range “1 to 5” is disclosed, the described range should be interpreted as including the ranges “1 to 4”, “1 to 3”, “1 to 2”, “1 to 2 and 4 to 5”, “1 to 3 and 5”, etc. When numerical ranges are described herein, unless otherwise stated, the range is intended to include its endpoints and all integers and fractions within that range.

[0024] Furthermore, the indefinite articles “a” and “an” preceding the elements or components of this invention do not impose any limitation on the quantity requirement (i.e., the number of times) of the elements or components. Therefore, “an” or “a” should be interpreted as including one or at least one, and the singular form of an element or component also includes the plural form, unless the quantity clearly refers to the singular form.

[0025] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0026] Example 1 A theanine microemulsion was prepared by the following method: S1. Weigh out the following components in the indicated mass amounts: PEG-120 methyl glucoside 0.1 kg, trimethylolpropane trioctanoate / tridecanoate 0.3 kg, phytosterol oleate 0.02 kg, theanine 1 kg, hydrogenated lecithin 0.5 kg, and water 20 kg.

[0027] S2. Mix PEG-120 methyl glucoside, trimethylolpropane trioctanoate / tridecanoate, and phytosterol oleate, and heat to dissolve to obtain the oil phase; mix theanine, hydrogenated lecithin, and water, and heat to 85 degrees Celsius to obtain the aqueous phase; mix the two phases and homogenize at 30 Hz for 30 minutes to obtain the colostrum; then treat the colostrum twice with a high-pressure microfluidic jet at 150 MPa.

[0028] Example 2 A theanine microemulsion was prepared by the following method: S1. Weigh out the following components in the indicated mass amounts: PEG-120 methyl glucoside 0.8 kg, trimethylolpropane trioctanoate / tridecanoate 0.1 kg, phytosterol oleate 0.2 kg, theanine 0.1 kg, hydrogenated lecithin 0.1 kg, and water 10 kg.

[0029] S2. Mix PEG-120 methyl glucoside, trimethylolpropane trioctanoate / tridecanoate, and phytosterol oleate, and heat to dissolve to obtain the oil phase; mix theanine, hydrogenated lecithin, and water, and heat to 85 degrees Celsius to obtain the aqueous phase; mix the two phases and homogenize at 30 Hz for 30 minutes to obtain the colostrum; then treat the colostrum twice with a high-pressure microfluidic jet at 150 MPa.

[0030] Example 3 A theanine microemulsion was prepared by the following method: S1. Weigh out the following components in the indicated mass amounts: PEG-120 methyl glucoside 0.5 kg, trimethylolpropane trioctanoate / tridecanoate 0.2 kg, phytosterol oleate 0.1 kg, theanine 0.5 kg, hydrogenated lecithin 0.3 kg, and water 15 kg.

[0031] S2. Mix PEG-120 methyl glucoside, trimethylolpropane trioctanoate / tridecanoate, and phytosterol oleate, and heat to dissolve to obtain the oil phase; mix theanine, hydrogenated lecithin, and water, and heat to 85 degrees Celsius to obtain the aqueous phase; mix the two phases and homogenize at 30 Hz for 30 minutes to obtain the colostrum; then treat the colostrum twice with a high-pressure microfluidic jet at 150 MPa.

[0032] Comparative Example 1 A theanine microemulsion was prepared by the following method: S1. Weigh out the following components in the indicated mass fractions: PEG-120 methyl glucoside 0.8 kg, trimethylolpropane trioctanoate / tridecanoate 0.2 kg, phytosterol oleate 0.1 kg, theanine 0.5 kg, and water 15 kg.

[0033] S2. Mix PEG-120 methyl glucoside, trimethylolpropane trioctanoate / tridecanoate, and phytosterol oleate, heat and dissolve to obtain the oil phase; mix theanine and water, heat to 85 degrees Celsius to obtain the aqueous phase; mix the two phases and homogenize at 30 Hz for 30 minutes to obtain the colostrum; then treat the colostrum twice with a high-pressure microfluidic jet at 150 MPa.

[0034] Comparative Example 2 A theanine microemulsion was prepared by the following method: S1. Weigh out the following components in the indicated mass amounts: 0.2 kg of trimethylolpropane trioctanoate / tridecanoate, 0.1 kg of phytosterol oleate, 0.5 kg of theanine, 0.8 kg of hydrogenated lecithin, and 15 kg of water.

[0035] S2. Mix trimethylolpropane trioctanoate / tridecanoate and phytosterol oleate, heat to dissolve, and prepare the oil phase; mix theanine, hydrogenated lecithin and water, heat to 85 degrees, and prepare the aqueous phase; mix the two phases and homogenize at 30 Hz for 30 minutes to obtain the colostrum; then treat the colostrum twice with a high-pressure microjet at 150 MPa.

[0036] Experiment 1 Laser particle size analyzer is a key instrument for evaluating the quality of microemulsions, capable of determining their average particle size and polydispersity index (PDI). According to industry experience, a PDI < 0.3 indicates that the microemulsion has good dispersibility and minimal particle adhesion and aggregation. In this study, the liposome samples prepared in Examples 1-2 were analyzed for particle size distribution using water as the dispersion medium at 25°C. The results are shown in Table 1.

[0037] Table 1. Measurement results from the laser particle size analyzer As can be seen from Table 1, the average particle size of theanine microemulsions prepared in Examples 1-3 of the present invention is controlled in the range of 200-400 nm, and the PDI value is <0.3, indicating that they have good dispersibility and better stability compared with Comparative Examples 1-2.

[0038] Example 4 A skin cleanser for children comprises the following components in percentage by weight: 1% disodium cocoamphodiacetate Sodium cocoylaminopropionate 4% Sodium methyl cocoyl taurate 0.4% Cocamidopropyl betaine 4% Guar gum hydroxypropyltrimethylammonium chloride 0.1% Citric acid 0.2% Phenoxyethanol 0.6% Sodium benzoate 0.2% Water balance.

[0039] Preparation process: Add water and guar gum hydroxypropyltrimethylammonium chloride to an emulsifying pot and stir evenly; then add disodium cocoamphodiacetate, sodium cocoaminopropionate, and sodium methylcocoyl taurate, heat to 85 degrees Celsius, stir until dissolved and transparent; cool to 45 degrees Celsius, add cocamidopropyl betaine, citric acid, phenoxyethanol, and sodium benzoate, and stir evenly; once the quality is qualified, the product can be discharged.

[0040] Example 5 A skin cleanser for children comprises the following components in percentage by weight: 3% disodium cocoamphodiacetate Sodium cocoylaminopropionate 2% 1% Sodium Methyl Cocoyl Taurate Cocamidopropyl betaine 2% Guar gum hydroxypropyltrimethylammonium chloride 0.3% Citric acid 0.8% Phenoxyethanol 0.4% Sodium benzoate 0.4% Water balance.

[0041] Preparation process: Add water and guar gum hydroxypropyltrimethylammonium chloride to an emulsifying pot and stir evenly; then add disodium cocoamphodiacetate, sodium cocoaminopropionate, and sodium methylcocoyl taurate, heat to 85 degrees Celsius, stir until dissolved and transparent; cool to 45 degrees Celsius, add cocamidopropyl betaine, citric acid, phenoxyethanol, and sodium benzoate, and stir evenly; once the quality is qualified, the product can be discharged.

[0042] Example 6 A skin cleanser for children comprises the following components in percentage by weight: 2% disodium cocoamphodiacetate Sodium cocoylaminopropionate 3% Sodium methyl cocoyl taurate 0.6% Cocamidopropyl betaine 3% Guar gum hydroxypropyltrimethylammonium chloride 0.2% Citric acid 0.5% Phenoxyethanol 0.5% Sodium benzoate 0.3% Water balance.

[0043] Preparation process: Add water and guar gum hydroxypropyltrimethylammonium chloride to an emulsifying pot and stir evenly; then add disodium cocoamphodiacetate, sodium cocoaminopropionate, and sodium methylcocoyl taurate, heat to 85 degrees Celsius, stir until dissolved and transparent; cool to 45 degrees Celsius, add cocamidopropyl betaine, citric acid, phenoxyethanol, and sodium benzoate, and stir evenly; once the quality is qualified, the product can be discharged.

[0044] Comparative Example 4 A skin cleanser for children comprises the following components in percentage by weight: Sodium cocoylaminopropionate 3% Sodium methyl cocoyl taurate 0.6% Cocamidopropyl betaine 3% Guar gum hydroxypropyltrimethylammonium chloride 0.2% Citric acid 0.5% Phenoxyethanol 0.5% Sodium benzoate 0.3% Water balance.

[0045] Preparation process: Add water and guar gum hydroxypropyltrimethylammonium chloride to an emulsifying pot and stir evenly; then add sodium cocoamidopropionate and sodium methylcocoamidoturate, heat to 85 degrees Celsius, stir until dissolved and transparent; cool to 45 degrees Celsius, add cocamidopropyl betaine, citric acid, phenoxyethanol, and sodium benzoate, and stir evenly; once the quality is qualified, the material can be discharged.

[0046] Comparative Example 5 A skin cleanser for children comprises the following components in percentage by weight: 2% disodium cocoamphodiacetate Sodium methyl cocoyl taurate 0.6% Cocamidopropyl betaine 3% Guar gum hydroxypropyltrimethylammonium chloride 0.2% Citric acid 0.5% Phenoxyethanol 0.5% Sodium benzoate 0.3% Water balance.

[0047] Preparation process: Add water and guar gum hydroxypropyltrimethylammonium chloride to an emulsifying pot and stir evenly; then add disodium cocoamphodiacetate and sodium methylcocoyl taurate, heat to 85 degrees Celsius, stir until dissolved and transparent; cool to 45 degrees Celsius, add cocamidopropyl betaine, citric acid, phenoxyethanol, and sodium benzoate, and stir evenly; once the quality is qualified, the product can be discharged.

[0048] Comparative Example 6 A skin cleanser for children comprises the following components in percentage by weight: 2% disodium cocoamphodiacetate Sodium cocoylaminopropionate 3% Cocamidopropyl betaine 3% Guar gum hydroxypropyltrimethylammonium chloride 0.2% Citric acid 0.5% Phenoxyethanol 0.5% Sodium benzoate 0.3% Water balance.

[0049] Preparation process: Add water and guar gum hydroxypropyltrimethylammonium chloride to an emulsifying pot and stir evenly; then add disodium cocoamphodiacetate and sodium cocoaminopropionate, heat to 85 degrees Celsius, stir until dissolved and transparent; cool to 45 degrees Celsius, add cocamidopropyl betaine, citric acid, phenoxyethanol, and sodium benzoate, and stir evenly; once the quality is qualified, the material can be discharged.

[0050] Experiment 2 Test objective: To evaluate the foaming speed (initial foam volume) and foam stability (decay over time) of the child skin cleansers prepared in Examples 4-6 and Comparative Examples 4-6 in water with different hardness, so as to assess their hard water resistance (the degree to which hard water inhibits foam).

[0051] Preparation of hard water: Dissolve 0.111 g CaCl2·2H2O + 0.095 g MgCl2·6H2O in 1 L of deionized water to obtain medium-hardness water. Soft water (deionized water) was used as the control group.

[0052] Test Procedure: Prepare a 0.5% active ingredient concentration solution using water of the corresponding hardness; then equilibrate in a 25℃ constant temperature water bath for 30 minutes; measure 200mL of the sample solution and pour it into a graduated cylinder; quickly pour it from a height of 90cm into another 50mL sample solution at the same temperature (simulating impact foaming); immediately record the foam height (mm) at 0 minutes (initial foam volume). Foam Stability Recording: Record the foam layer height (mm) at 5 minutes. Repetition: Test each sample three times in parallel at each hardness, take the average value, and calculate the hard water resistance index. Hard water resistance index = (H_hard / H_soft) × 100%, the higher the value, the better the hard water resistance. See Table 2 for specific test results.

[0053] Table 2 Data Record Table As can be seen from Table 2, the foam height of the children's skin cleanser prepared in Examples 4-6 of the present invention is between 150-200 mm at 0 min and between 150-190 mm after 5 min, with a hard water resistance index of about 85%. Compared with Comparative Examples 4-6, it shows better hard water resistance and foaming performance.

[0054] Example 7 A skin cleanser for children comprises the following components in percentage by weight: 2% disodium cocoamphodiacetate Sodium cocoylaminopropionate 3% Sodium methyl cocoyl taurate 0.6% Cocamidopropyl betaine 3% Guar gum hydroxypropyltrimethylammonium chloride 0.2% The theanine microemulsion prepared in Example 3 (5%) Citric acid 0.5% Phenoxyethanol 0.5% Sodium benzoate 0.3% Water balance.

[0055] Preparation process: Add water and guar gum hydroxypropyltrimethylammonium chloride to an emulsifying pot and stir evenly; then add disodium cocoamphodiacetate, sodium cocoaminopropionate, and sodium methylcocoyl taurate, heat to 85 degrees Celsius, stir until dissolved and transparent; cool to 45 degrees Celsius, add cocamidopropyl betaine, citric acid, theanine microemulsion, phenoxyethanol, and sodium benzoate, and stir evenly; once the quality is qualified, the product can be discharged.

[0056] Experiment 3 The children's skin cleansers prepared in Examples 6-7 were tested in accordance with the methods described in the Acute Eye Irritation / Corrosion Test of the Cosmetic Safety Technical Specifications (2015 Edition) to evaluate whether the products have an irritant or corrosive effect on the eyes of mammals and the extent thereof.

[0057] The test substance was instilled once into the conjunctival sac of one eye of each experimental animal, with the untreated eye serving as a self-control. The degree of irritation and corrosiveness to the animal's eye was observed and scored at specified time intervals to evaluate the irritant effect of the test substance on the eye. The observation period should be sufficient to assess the reversibility or irreversibility of the irritant effect.

[0058] Specific testing procedure: The liquid test substance does not need to be diluted; the undiluted solution is used directly, with an exposure dose of 0.1 mL. Healthy adult white rabbits are preferred. Gently pull back the lower eyelid of one rabbit's eye and instill 0.1 mL of the test substance from Example 6 into the conjunctival sac, passively closing the upper and lower eyelids for 1 second to prevent loss of the test substance. Instill 0.1 mL of the test substance from Example 7 into the other eye as a control. At 30 seconds, rinse with a sufficient volume of water at a relatively fast flow rate that will not cause damage to the animal's eye for 30 seconds. Examine the animal's eyes at 1, 24, 48, and 72 hours after instillation of the test substance, as well as on days 4 and 7. If no irritation occurs after 72 hours, the test can be terminated. If corneal involvement or other eye irritation is found that does not recover within 7 days, the observation period needs to be extended to determine the reversibility or irreversibility of the damage, generally not exceeding 21 days, and observation reports at 7, 14, and 21 days should be provided. In addition to observing the cornea, iris, and conjunctiva, all other adverse effects should be recorded and reported. In each examination, scoring should be performed according to the scoring criteria in the acute eye irritation / corrosiveness test of the "Cosmetic Safety Technical Specifications" (2015 edition). The intensity of the test substance's irritation to the eye should be determined based on the average highest score of the irritation response at each observation time point (24h, 48h, and 72h) and the recovery time. Specific test results are shown in Table 3.

[0059] Table 3 Results of Acute Eye Irritation Tests As shown in Table 3, Example 6 of the present invention showed only slight irritation, while Example 7 showed no irritation. Therefore, the products prepared in the examples of the present invention have mild properties, and the addition of theanine microemulsion can further reduce eye irritation, ultimately resulting in a product that is non-irritating to the eyes.

[0060] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A mild amino acid composition, characterized in that, It comprises, by weight, 3.4-8 parts of a first surfactant and 2.1-4.3 parts of a second thickening agent; The first surfactant includes disodium cocoamphodiacetate, sodium cocoaminopropionate, and sodium methylcocoyl taurate. The second thickening activator includes cocamidopropyl betaine and guar hydroxypropyltrimethylammonium chloride.

2. The mild amino acid composition according to claim 1, characterized in that, The first surfactant comprises disodium cocoamphodiacetate, sodium cocoaminopropionate, and sodium methylcocoyl taurate in a weight ratio of (1-3):(2-4):(0.4-1).

3. The mild amino acid composition according to claim 1, characterized in that, The second thickening activator comprises cocamidopropyl betaine and guar hydroxypropyltrimethylammonium chloride in a weight ratio of (2-4):(0.1-0.3).

4. A skin cleanser for children, characterized in that, Includes the mild amino acid composition according to any one of claims 1-3, a pH adjuster, a preservative, and water.

5. The children's skin cleanser according to claim 4, characterized in that, The pH adjuster is one or a mixture of more than one of citric acid, lactic acid, malic acid, tartaric acid, phosphoric acid, sodium dihydrogen phosphate, disodium hydrogen phosphate, hydrochloric acid, and glycolic acid.

6. The children's skin cleanser according to claim 5, characterized in that, The pH adjuster mentioned is citric acid.

7. The children's skin cleanser according to claim 4, characterized in that, The preservative is one or a mixture of more than one of phenoxyethanol, sodium benzoate, benzoic acid, sorbic acid, potassium sorbate, 1,2-hexanediol, 1,2-pentanediol, octyl glycol, and ethylhexylglycerin.

8. The children's skin cleanser according to claim 7, characterized in that, The preservative is a mixture of phenoxyethanol and sodium benzoate.

9. The children's skin cleanser according to claim 4, characterized in that, It also includes theanine microemulsion; The preparation method of the theanine microemulsion includes the following steps: S1. Weigh out the following components in the indicated mass parts: PEG-120 methyl glucoside 0.1-0.8 parts, trimethylolpropane trioctanoate / tridecanoate 0.1-0.3 parts, phytosterol oleate 0.02-0.2 parts, theanine 0.1-1 parts, hydrogenated lecithin 0.1-0.5 parts, and water 10-20 parts. S2. Mix PEG-120 methyl glucoside, trimethylolpropane trioctanoate / tridecanoate, and phytosterol oleate, and heat to dissolve to obtain the oil phase; mix theanine, hydrogenated lecithin, and water, and heat to 85 degrees Celsius to obtain the aqueous phase; mix the two phases and homogenize at 30 Hz for 30 minutes to obtain the colostrum; then treat the colostrum twice with a high-pressure microfluidic jet at 150 MPa.

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