Application of a surfactant containing lauroyl alanine in shampoo

Abstract

The invention discloses an application of a lauroyl alanine surfactant in shampoo, and relates to the technical field of daily chemical products. The invention discloses a shampoo prepared from the lauroyl alanine surfactant, the shampoo comprising the lauroyl alanine surfactant, a co-surfactant thickener, a softener, a humectant, a preservative, a buffer, a chelating agent, and the balance being deionized water. The lauroyl alanine surfactant is obtained by neutralizing lauroyl alanine, arginine and sodium hydroxide. The co-surfactant is one or more combinations of octyl (lauryl) glucoside, cocamidopropyl betaine, guar hydroxypropyl trimethyl ammonium chloride and amidated rhamnolipid. The amidated rhamnolipid is obtained by introducing amide macromolecules into rhamnolipid, thereby improving the fluffy effect of hair after washing and facilitating the deposition of other components, such as subsequent softener and other components, so that the hair is smoother and easier to manage.

Description

Technical Field

[0001] The invention relates to the technical field of daily chemical products, in particular to application of a surfactant containing lauroyl alanine in shampoo. Background Art

[0002] Shampoo is the earliest, fastest-growing and most important hair cosmetic among many hair care products. Common surfactants in shampoo include anionic surfactants (such as sodium lauryl sulfate), amphoteric surfactants (such as betaine type), nonionic surfactants (such as alkyl polyglycosides) and amino acid surfactants. These surfactants have their own advantages and disadvantages. For example, anionic surfactants have strong detergency. Although they can produce rich foam, they may be highly irritating to the skin and hair. Amphoteric surfactants: such as betaine type, this type of surfactant can work under acidic and alkaline conditions, and has low irritation to the skin and hair, and is often used in mild shampoos; nonionic surfactants: such as alkyl polyglycosides (APG), this type of surfactant has the least irritation to the skin and hair, and has good biodegradability, suitable for use in natural or sulfate-free shampoos; amino acid surfactants: such as disodium cocoyl glutamate, this type of surfactant is favored for its mildness and low irritation, and is often used in high-end shampoo products.

[0003] Choosing the right surfactant requires considering the target users and usage requirements of the shampoo. For example, for sensitive scalps or babies, milder nonionic or amino acid surfactants are recommended. For shampoo products that require strong cleansing, anionic surfactants may be selected.

[0004] In addition, the development trend of modern shampoo is to develop in the direction of "sulfate-free" to reduce irritation to the scalp and hair, and pay more attention to its mildness and safety when selecting surfactants; a good shampoo, in addition to basic dirt removal, dandruff removal, and oil control performance, must also take into account the softness, combability, fluffy and dryness of the hair after washing. Therefore, when formulating shampoo, it is not only necessary to select raw materials from the surfactant level, but also the matching of various types of conditioners is also very important. Summary of the invention

[0005] The object of the present invention is to provide a method for applying a surfactant containing lauroyl alanine in shampoo to solve the problems in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The invention discloses an application of a lauroyl alanine surfactant in a shampoo. The shampoo comprises the following components in parts by weight: 20-30 parts of lauroyl alanine surfactant, 2-3 parts of co-surfactant, 0.3-2 parts of thickener, 1-2 parts of softener, 3-4 parts of humectant, 0.5-0.8 parts of preservative, 0.3-0.5 parts of buffer, 0.2-0.5 parts of chelating agent, and deionized water is added to make up to 100 parts.

[0008] The preparation method of the shampoo specifically comprises the following steps:

[0009] Heat the deionized water to 80°C, add the chelating agent, thickener and preservative in turn and stir to dissolve, add the lauroyl alanine surfactant and stir evenly, then add the co-surfactant and softener and stir evenly, cool to 35-45°C, add the humectant and buffer and stir evenly, and discharge the material after defoaming.

[0010] The lauroyl alanine surfactant comprises the following raw materials in parts by weight: 25-30 parts of lauroyl alanine, 10-12 parts of arginine, 0.8-1.0 parts of sodium hydroxide, and 65-68 parts of deionized water; the preparation steps of the lauroyl alanine surfactant are as follows: weigh the raw materials by parts by weight, put lauroyl alanine, arginine and sodium hydroxide in deionized water, heat to 75°C to dissolve and neutralize, stir and keep warm for 30 minutes, and then cool to 35-45°C to obtain the lauroyl alanine surfactant.

[0011] The co-surfactant is one or more combinations of octyl glucoside, cocamidopropyl betaine, guar hydroxypropyltrimethylammonium chloride and amidated rhamnolipid;

[0012] Preferably, the cosurfactant is a combination of cocamidopropyl betaine, guar hydroxypropyltrimethylammonium chloride and amidated rhamnolipid in a mass ratio of (4-5): (0.1-0.3): (2-5);

[0013] Preferably, the preparation steps of amidated rhamnolipid are as follows:

[0014] Step S1: After adding methyl acrylate to the methanol solution and mixing, slowly dripping it into the methanol solution containing ethylenediamine under stirring, controlling the temperature during the dripping process to be 0-0.5°C, heating it to 25-30°C after the dripping is completed, stirring it overnight, rotary evaporating the solvent, and then placing it in a methanol solution, slowly dripping it into the methanol solution containing ethylenediamine under an ice water bath, controlling the temperature during the dripping process to be 0-0.5°C, heating it to 25-30°C after the dripping, stirring it overnight, and rotary evaporating the solvent to obtain an amide macromolecule;

[0015] Step S2: Under a protective atmosphere, the amide macromolecule prepared in step S1 is mixed with rhamnolipid and methanol and stirred evenly, and then a catalyst is added, the temperature is raised to 60-80° C., the reaction is stirred for 12-14 hours, the reaction is cooled to room temperature, and the solvent is evaporated by rotary evaporation to obtain amidated rhamnolipid.

[0016] The softener is any one of modified silicone oil and amino silicone oil;

[0017] Preferably, the preparation steps of the modified silicone oil are as follows: under a protective atmosphere, allyl epoxy polyether and hydrogen-containing silicone oil are mixed, the temperature is raised to 80°C while stirring, chloroplatinic acid catalyst is added to keep the temperature for 3 hours, cooled to room temperature, filtered and mixed with N, N-dimethyldodecylamine and acetic acid, isopropanol is added, stirred and heated to 80°C, and refluxed for 8-10 hours to obtain modified silicone oil.

[0018] The moisturizing agent is one or more combinations of glycerin, sodium hyaluronate, panthenol, ceramide, and sodium pyrrolidonecarboxylate.

[0019] Preferably, the moisturizer is a combination of glycerol, sodium hyaluronate, ceramide and panthenol in a mass ratio of (2-3): 0.08:0.1:0.1.

[0020] The buffer is one or more combinations of citric acid, tartaric acid and triethanolamine.

[0021] The chelating agent is any one of disodium EDTA and sodium citrate.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. Use lauroyl alanine, arginine and sodium hydroxide as the main surfactant after neutralization, among which arginine has the effect of promoting hair follicle growth and treating androgenic alopecia, and also has certain antibacterial properties; the amino acid surfactant prepared by combining lauroyl alanine and arginine is mild and less irritating, and has strong degreasing and cleaning ability. It is assisted by a co-surfactant and used in combination with cocamidopropyl betaine, guar hydroxypropyl trimethylammonium chloride and amidated rhamnolipid to synergistically improve the cleaning effect; amidated rhamnolipid is a dendritic polymer grafted with rhamnolipid with cationic properties, which improves the effect of reducing viscosity due to the addition of a single rhamnolipid and plays an additional thickening role; it is deposited on the hair surface through electrostatic action, which improves the fluffy effect of the hair after washing, and is also conducive to the deposition of other components, such as the subsequent silicone oil component, making the hair smoother and easier to manage;

[0024] 2. The modified silicone oil used in the shampoo ingredients undergoes silane addition reaction with allyl epoxy polyether to reduce the silicon content. When introduced into the shampoo, it can ensure smoothness while reducing the damage of silicone oil to the hair. The introduction of quaternary ammonium salt after silane addition has bactericidal and antistatic effects. The addition of moisturizers can improve the irritation of chemical components in shampoo to a certain extent.

[0025] 3. The components of the shampoo proposed by the present invention are common and can be obtained from many sources, so industrial production can be realized; and the proportions between the components are strict in order to achieve the best effect. DETAILED DESCRIPTION

[0026] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0027] In the examples, rhamnolipid was purchased from Shanghai Aladdin, with the product number R488080; the brand of allyl epoxy polyether was Senfida SF-11B / 91B; the hydrogen content of hydrogen-containing silicone oil was 1.65%, and the brand was Wacker WS61CN; amino silicone oil was purchased from Guangzhou Daoming Chemical, with the product number DM-DS1008;

[0028] The preparation steps of lauroyl alanine surfactant are as follows:

[0029] The raw materials were weighed by mass, lauroyl alanine, arginine and sodium hydroxide were placed in deionized water, the temperature was raised to 75° C. for dissolution and neutralization, the temperature was stirred and kept warm for 30 minutes, and then the temperature was lowered to 45° C. to obtain the lauroyl alanine surfactant.

[0030] The preparation steps of amidated rhamnolipid are as follows:

[0031] Step S1: Add 35.8g of methyl acrylate to a three-necked flask containing 50mL of methanol solution and mix well, then introduce nitrogen to deoxygenate for 1h, slowly dropwise add 50mL of methanol solution containing 5g of ethylenediamine under stirring, control the temperature to 0-0.5°C during the dropping process, heat to 25°C after the dropping, stir overnight, and rotary evaporate the solvent to obtain a viscous liquid, place the above product in 50mL of methanol solution, and slowly dropwise add it to 50mL of methanol solution containing 25g of ethylenediamine under an ice-water bath, control the temperature to 0-0.5°C during the dropping process, heat to 25°C after the dropping, stir overnight, and rotary evaporate the solvent, purify and vacuum dry to obtain amide macromolecules;

[0032] Step S2: Under a nitrogen atmosphere, 2 g of the amide macromolecule prepared in step S1, 5 g of rhamnolipid and 20 mL of methanol were mixed and stirred evenly, and then 0.3 g of concentrated sulfuric acid was added, the temperature was raised to 60° C., the reaction was stirred for 12 h, cooled to room temperature, and the methanol was removed by rotary evaporation to obtain amidated rhamnolipid.

[0033] The preparation steps of modified silicone oil are as follows:

[0034] Under a protective atmosphere, allyl epoxy polyether and hydrogenated silicone oil were mixed in a molar ratio of 1:1, heated to 80°C while stirring, 15 ppm chloroplatinic acid catalyst was added and the reaction was kept warm for 3 hours, cooled to room temperature, filtered, mixed with N, N-dimethyldodecylamine and acetic acid in a molar ratio of 1:2:2, isopropanol was added, stirred, heated to 80°C, and refluxed for 10 hours.

[0035] Embodiment 1:

[0036] The shampoo comprises the following components in parts by weight: 28 parts of lauroyl alanine surfactant, 2 parts of co-surfactant, 1 part of sodium chloride, 1 part of modified silicone oil, 3 parts of moisturizer, 0.8 parts of potassium sorbate, 0.4 parts of citric acid, 0.5 parts of disodium EDTA, and the balance is deionized water;

[0037] The lauroyl alanine surfactant is composed of 30 parts of lauroyl alanine, 10.76 parts of arginine, 0.86 parts of sodium hydroxide and 66 parts of deionized water;

[0038] The cosurfactant is composed of cocamidopropyl betaine, guar hydroxypropyltrimethylammonium chloride and amidated rhamnolipid in a mass ratio of 5:0.2:4;

[0039] The moisturizer is composed of glycerin, sodium hyaluronate, ceramide and panthenol in a mass ratio of 3:0.08:0.1:0.1;

[0040] The preparation steps of the shampoo are as follows: heat the deionized water to 80°C, add disodium EDTA, sodium chloride and potassium sorbate in sequence and stir to dissolve, add lauroyl alanine surfactant and stir evenly, then add co-surfactant and modified silicone oil and stir evenly, cool to 35°C, add moisturizer and citric acid and stir evenly, and discharge after defoaming.

[0041] Example 2: Referring to Example 1, adjust the shampoo components;

[0042] The shampoo comprises the following components in parts by weight: 25 parts of lauroyl alanine surfactant, 2 parts of co-surfactant, 1 part of sodium chloride, 1 part of modified silicone oil, 3 parts of moisturizer, 0.8 parts of potassium sorbate, 0.4 parts of citric acid, 0.2 parts of disodium EDTA, and the balance is deionized water;

[0043] The lauroyl alanine surfactant is composed of 30 parts of lauroyl alanine, 10.76 parts of arginine, 0.86 parts of sodium hydroxide and 66 parts of deionized water;

[0044] The cosurfactant is composed of cocamidopropyl betaine, guar hydroxypropyltrimethylammonium chloride and amidated rhamnolipid in a mass ratio of 5:0.2:4;

[0045] The moisturizer is composed of glycerin, sodium hyaluronate, ceramide and panthenol in a mass ratio of 3:0.08:0.1:0.1;

[0046] The preparation steps of the shampoo are as follows: heat the deionized water to 80°C, add disodium EDTA, sodium chloride and potassium sorbate in sequence and stir to dissolve, add lauroyl alanine surfactant and stir evenly, then add co-surfactant and modified silicone oil and stir evenly, cool to 35°C, add moisturizer and citric acid and stir evenly, and discharge after defoaming.

[0047] Example 3: Referring to Example 1, adjust the shampoo components;

[0048] The shampoo comprises the following components in parts by weight: 30 parts of lauroyl alanine surfactant, 3 parts of co-surfactant, 1 part of sodium chloride, 2 parts of modified silicone oil, 4 parts of moisturizer, 0.8 parts of potassium sorbate, 0.5 parts of citric acid, 0.5 parts of disodium EDTA, and the balance is deionized water;

[0049] The lauroyl alanine surfactant is composed of 30 parts of lauroyl alanine, 10.76 parts of arginine, 0.86 parts of sodium hydroxide and 66 parts of deionized water;

[0050] The cosurfactant is composed of cocamidopropyl betaine, guar hydroxypropyltrimethylammonium chloride and amidated rhamnolipid in a mass ratio of 5:0.2:4;

[0051] The moisturizer is composed of glycerin, sodium hyaluronate, ceramide and panthenol in a mass ratio of 3:0.08:0.1:0.1;

[0052] The preparation steps of the shampoo are as follows: heat the deionized water to 80°C, add disodium EDTA, sodium chloride and potassium sorbate in sequence and stir to dissolve, add lauroyl alanine surfactant and stir evenly, then add co-surfactant and modified silicone oil and stir evenly, cool to 35°C, add moisturizer and citric acid and stir evenly, and discharge after defoaming.

[0053] Example 4: Referring to Example 1, the ingredients of lauroyl alanine surfactant, co-surfactant and moisturizer were adjusted;

[0054] The shampoo comprises the following components in parts by weight: 28 parts of lauroyl alanine surfactant, 2 parts of co-surfactant, 1 part of sodium chloride, 1 part of modified silicone oil, 3 parts of moisturizer, 0.8 parts of potassium sorbate, 0.4 parts of citric acid, 0.5 parts of disodium EDTA, and the balance is deionized water;

[0055] The lauroyl alanine surfactant is composed of 28 parts of lauroyl alanine, 10 parts of arginine, 0.8 parts of sodium hydroxide and 68 parts of deionized water;

[0056] The cosurfactant is composed of cocamidopropyl betaine, guar hydroxypropyltrimethylammonium chloride and amidated rhamnolipid in a mass ratio of 5:0.3:5;

[0057] The moisturizer is composed of glycerin, sodium hyaluronate, ceramide and panthenol in a mass ratio of 3:0.08:0.1:0.1;

[0058] The preparation steps of the shampoo are as follows: heat the deionized water to 80°C, add disodium EDTA, sodium chloride and potassium sorbate in sequence and stir to dissolve, add lauroyl alanine surfactant and stir evenly, then add co-surfactant and modified silicone oil and stir evenly, cool to 35°C, add moisturizer and citric acid and stir evenly, and discharge after defoaming.

[0059] Example 5: Referring to Example 1, the ingredients of lauroyl alanine surfactant, co-surfactant and moisturizer were adjusted;

[0060] The shampoo comprises the following components in parts by weight: 28 parts of lauroyl alanine surfactant, 2 parts of co-surfactant, 1 part of sodium chloride, 1 part of modified silicone oil, 3 parts of moisturizer, 0.8 parts of potassium sorbate, 0.4 parts of citric acid, 0.5 parts of disodium EDTA, and the balance is deionized water;

[0061] The lauroyl alanine surfactant is composed of 30 parts of lauroyl alanine, 12 parts of arginine, 1.0 part of sodium hydroxide and 65 parts of deionized water;

[0062] The cosurfactant is composed of cocamidopropyl betaine, guar hydroxypropyltrimethylammonium chloride and amidated rhamnolipid in a mass ratio of 4:0.1:2;

[0063] The moisturizer is composed of glycerin, sodium hyaluronate, ceramide and panthenol in a mass ratio of 2:0.08:0.1:0.1;

[0064] The preparation steps of the shampoo are as follows: heat the deionized water to 80°C, add disodium EDTA, sodium chloride and potassium sorbate in sequence and stir to dissolve, add lauroyl alanine surfactant and stir evenly, then add co-surfactant and modified silicone oil and stir evenly, cool to 35°C, add moisturizer and citric acid and stir evenly, and discharge after defoaming.

[0065] Example 6: Referring to Example 1, the difference therefrom is that the amidated rhamnolipid is replaced with octyl glucoside;

[0066] The shampoo comprises the following components in parts by weight: 28 parts of lauroyl alanine surfactant, 2 parts of co-surfactant, 1 part of sodium chloride, 1 part of modified silicone oil, 3 parts of moisturizer, 0.8 parts of potassium sorbate, 0.4 parts of citric acid, 0.5 parts of disodium EDTA, and the balance is deionized water;

[0067] The lauroyl alanine surfactant is composed of 30 parts of lauroyl alanine, 10.76 parts of arginine, 0.86 parts of sodium hydroxide and 66 parts of deionized water;

[0068] The cosurfactant is composed of cocamidopropyl betaine, guar hydroxypropyltrimonium chloride and octyl glucoside in a mass ratio of 5:0.2:4;

[0069] The moisturizer is composed of glycerin, sodium hyaluronate, ceramide and panthenol in a mass ratio of 3:0.08:0.1:0.1;

[0070] The preparation steps of the shampoo are as follows: heat the deionized water to 80°C, add disodium EDTA, sodium chloride and potassium sorbate in sequence and stir to dissolve, add lauroyl alanine surfactant and stir evenly, then add co-surfactant and modified silicone oil and stir evenly, cool to 35°C, add moisturizer and citric acid and stir evenly, and discharge after defoaming.

[0071] Example 7: Referring to Example 1, the difference therefrom is that the moisturizing agent is replaced with single glycerin;

[0072] The shampoo comprises the following components in parts by weight: 28 parts of lauroyl alanine surfactant, 2 parts of co-surfactant, 1 part of sodium chloride, 1 part of modified silicone oil, 3 parts of glycerol, 0.8 parts of potassium sorbate, 0.4 parts of citric acid, 0.5 parts of disodium EDTA, and the balance is deionized water;

[0073] The lauroyl alanine surfactant is composed of 30 parts of lauroyl alanine, 10.76 parts of arginine, 0.86 parts of sodium hydroxide and 66 parts of deionized water;

[0074] The cosurfactant is composed of cocamidopropyl betaine, guar hydroxypropyltrimethylammonium chloride and amidated rhamnolipid in a mass ratio of 5:0.2:4;

[0075] The preparation steps of the shampoo are as follows: heat the deionized water to 80°C, add disodium EDTA, sodium chloride and potassium sorbate in sequence and stir to dissolve, add lauroyl alanine surfactant and stir evenly, then add co-surfactant and modified silicone oil and stir evenly, cool to 35°C, add moisturizer and citric acid and stir evenly, and discharge after defoaming.

[0076] Example 8: Referring to Example 1, the difference therefrom is that the modified silicone oil is replaced with amino silicone oil;

[0077] The shampoo comprises the following components by weight: 28 parts of lauroyl alanine surfactant, 2 parts of co-surfactant, 1 part of sodium chloride, 1 part of amino silicone oil, 3 parts of moisturizer, 0.8 parts of potassium sorbate, 0.4 parts of citric acid, 0.5 parts of disodium EDTA, and the balance is deionized water;

[0078] The lauroyl alanine surfactant is composed of 30 parts of lauroyl alanine, 10.76 parts of arginine, 0.86 parts of sodium hydroxide and 66 parts of deionized water;

[0079] The cosurfactant is composed of cocamidopropyl betaine, guar hydroxypropyltrimethylammonium chloride and amidated rhamnolipid in a mass ratio of 5:0.2:4;

[0080] The moisturizer is composed of glycerin, sodium hyaluronate, ceramide and panthenol in a mass ratio of 3:0.08:0.1:0.1;

[0081] The preparation steps of the shampoo are as follows: heat the deionized water to 80°C, add disodium EDTA, sodium chloride and potassium sorbate in sequence and stir to dissolve, add lauroyl alanine surfactant and stir evenly, then add co-surfactant and modified silicone oil and stir evenly, cool to 35°C, add moisturizer and citric acid and stir evenly, and discharge after defoaming.

[0082] Detection test

[0083] 1. Foam performance: According to GB / T 29679-2013, the foam height of shampoo was evaluated using a Roche foam instrument, and the foam height data at the beginning, 1 min, 5 min and 10 min later were recorded, as shown in Table 1:

[0084] Table 1

[0085]

[0086] 2. Dry and wet combing performance and fluffiness test:

[0087] Take 24 standard in vitro hair bundles and randomly divide them into 8 groups, 3 bundles in each group, and test the initial volume (initial fluffy maximum load) of each hair bundle using a hair multifunctional tester. Each hair bundle is tested 5 times;

[0088] Take 0.5g of the shampoo sample prepared in Examples 1-8, apply it evenly on the hair bundle, leave it for 1 minute, and then rinse it with clean water. After completion, lay the hair bundle flat on the table, comb it 10 times on both sides with a flat comb to unclog the knotted position, and then gently immerse the hair bundle in a beaker so that the hair does not touch the side of the beaker, and then gently wipe off the excess water between two gloved fingers (the weighing weight gain range is 60%±5%). Use a hair multifunctional testing system to test the wet combing performance of the hair bundle, and test each hair bundle 5 times;

[0089] After the wet combing performance test is completed, the hair bundles are hung in a constant temperature and humidity environment of (26±2)°C and (60±10)% RH for drying. The volume of the hair bundles after washing is measured using a hair multi-function tester. Each hair bundle is tested 5 times to obtain the maximum load of the post-washing fluffy hair. The initial maximum load of the fluffy hair is subtracted to calculate the change value of the maximum load of the fluffy hair.

[0090] The hair multifunctional testing system was used again to test the dry combing performance of the hair bundles. Each hair bundle was tested 5 times. The above data are recorded in Table 2.

[0091] Table 2

[0092]

[0093] 3. Human sensory evaluation: 5 formulators scored and compared the shampoo prepared in Example 1 (the effects vary depending on hair quality). The products were preliminarily evaluated based on the foam and feel when applied to the hair, the slippery feel and astringency when rinsing wet hair, the rinsing time, the feel when semi-dry, the feel when completely dry, the state after drying and the duration of the treatment. The full score is 5 points, with 5 points being the best effect, and the effects decreasing in order from 4, 3, 2, 1 point, and 1 point being the worst effect. The average value was taken; see Table 3.

[0094] Table 3

[0095] project Foam feel Wet hair feel Semi-dry feel Dry state Scoring 4.2 4.4 5 4.8

[0096] Washing time: 2-6 minutes, there are individual differences, which are not scored;

[0097] Duration: 3-5 days, there are individual differences, no score is calculated;

[0098] Conclusion: Based on the above experimental data, it is comprehensively concluded that Example 1 has better effects than the other examples. Under the component ratio of Example 1, the foam is stable and rich, showing good foam performance; the wet hair is smoother, and the fluffiness of the hair after washing is better than that of the other examples, and has better combing performance, improving the smoothness of the hair bundle.

[0099] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An application of a surfactant containing lauroyl alanine in shampoo, characterized in that: The shampoo comprises the following components in parts by weight: 20-30 parts of lauroyl alanine surfactant, 2-3 parts of co-surfactant, 0.3-2 parts of thickener, 1-2 parts of softener, 3-4 parts of moisturizer, 0.5-0.8 parts of preservative, 0.3-0.5 parts of buffer, 0.2-0.5 parts of chelating agent, and deionized water is added to make up to 100 parts.

2. The use of a surfactant containing lauroyl alanine in shampoo according to claim 1, characterized in that: The preparation method of the shampoo specifically comprises the following steps: Heat the deionized water to 80°C, add the chelating agent, thickener and preservative in turn and stir to dissolve, then add the lauroyl alanine surfactant and stir evenly, then add the co-surfactant and softener and stir evenly, cool down to 35-45°C, add the humectant and buffer and stir evenly, and discharge the material after defoaming.

3. The use of a surfactant containing lauroyl alanine in shampoo according to claim 1, characterized in that: The lauroyl alanine surfactant comprises the following raw materials in parts by weight: 25-30 parts of lauroyl alanine, 10-12 parts of arginine, 0.8-1.0 parts of sodium hydroxide, and 65-68 parts of deionized water; the preparation steps of the lauroyl alanine surfactant are as follows: weigh the raw materials by parts by weight, put lauroyl alanine, arginine and sodium hydroxide in deionized water, heat to 75°C to dissolve and neutralize, stir and keep warm for 30 minutes, and then cool to 35-45°C to obtain the lauroyl alanine surfactant.

4. The use of a surfactant containing lauroyl alanine in shampoo according to claim 1, characterized in that: The auxiliary surfactant is one or more combinations of octyl (lauryl) glucoside, cocamidopropyl betaine, guar gum hydroxypropyltrimethylammonium chloride and amidated rhamnolipid.

5. The use of a surfactant containing lauroyl alanine in shampoo according to claim 4, characterized in that: The preparation steps of the amidated rhamnolipid are as follows: Step S1: After adding methyl acrylate to the methanol solution and mixing, slowly dripping it into the methanol solution containing ethylenediamine under stirring, controlling the temperature during the dripping process to be 0-0.5°C, heating it to 25-30°C after the dripping is completed, stirring it overnight, rotary evaporating the solvent, and then placing it in a methanol solution, slowly dripping it into the methanol solution containing ethylenediamine under an ice water bath, controlling the temperature during the dripping process to be 0-0.5°C, heating it to 25-30°C after the dripping, stirring it overnight, and rotary evaporating the solvent to obtain an amide macromolecule; Step S2: Under a protective atmosphere, the amide macromolecule prepared in step S1 is mixed with rhamnolipid and methanol and stirred evenly, and then a catalyst is added, the temperature is raised to 60-80° C., the reaction is stirred for 12-14 hours, the reaction is cooled to room temperature, and the solvent is evaporated by rotary evaporation to obtain amidated rhamnolipid.

6. The use of a surfactant containing lauroyl alanine in shampoo according to claim 1, characterized in that: The softener is any one of amino silicone oil and modified silicone oil; wherein the preparation steps of the modified silicone oil are as follows: under a protective atmosphere, allyl epoxy polyether and hydrogen-containing silicone oil are mixed, the temperature is raised to 80°C while stirring, chloroplatinic acid catalyst is added to keep the temperature for reaction for 3 hours, cooled to room temperature, filtered, mixed with N, N-dimethyldodecylamine and acetic acid, isopropanol is added, stirred, heated to 80°C, and refluxed for 8-10 hours to obtain the modified silicone oil.

7. The use of a surfactant containing lauroyl alanine in shampoo according to claim 1, characterized in that: The moisturizing agent is one or more combinations of glycerin, sodium hyaluronate, ceryl lipid, panthenol and sodium pyrrolidonecarboxylate.

8. The use of a surfactant containing lauroyl alanine in shampoo according to claim 1, characterized in that: The buffer is one or more combinations of citric acid, tartaric acid and triethanolamine.

9. The use of a surfactant containing lauroyl alanine in shampoo according to claim 1, characterized in that: The chelating agent is any one of disodium EDTA and sodium citrate.

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