Scalp pre-washing composition and preparation method thereof

Abstract

The invention discloses a scalp pre-washing composition and a preparation method thereof, the scalp pre-washing composition comprises the following components in percentage by mass: 0.1-20% of liquid grease, 0.5-20% of a nonionic surfactant, 1-10% of a hair surfactant, 1-80% of polyol and / or 1-30% of sugar alcohol, the sum of the mass fractions of the components does not exceed 100%, and the balance of filler. The shampoo can gently and efficiently clean scalp and hair follicles, silicone oil flocculation deposition of conventional shampoo on the scalp is effectively removed, the scalp epidermis chapped due to dryness can not be generated even if the shampoo is continuously used for a long time, and generation of scalp white crumbs caused by dryness is inhibited.

Description

Technical Field

[0001] The present invention relates to the field of cosmetics, and in particular to a scalp pre-washing composition and a preparation method thereof. Background Art

[0002] The diversification of people's lifestyles and diets, coupled with the segmentation of cleansing products, has led to a wide variety of cleansing products. In particular, the emergence of dual-phase cleansing oils in recent years has optimized makeup removal efficiency while becoming a representative of gentle cleansing products.

[0003] As consumers gain a deeper understanding of scalp cleansing and care, oil-control and dirt-removing head cleansing products and hair follicle cleansing products are becoming more and more common. However, all current scalp cleansing products use the micellar structure of surfactants to remove dirt from the scalp, often aiming to double cleanse the scalp and hair. While removing dirt, they also place a great burden on the scalp. Unlike hair, the scalp contains various ingredients, such as glycerol fatty acids, squalene, cholesterol, ceramides, fatty acids, glycerol, amino acids, and proteins. Excessive amounts of surfactants, or improper selection of surfactants, will not only fail to remove dirt, but will also accelerate the loss of beneficial lipids on the scalp, causing secondary damage to the scalp. In addition, the current formula design of conventional scalp cleansing solutions (such as shampoos and scalp cleansers) has inherent defects in order to meet the scalp's demand for low viscosity (for easy application and rinsing): 1. Excessive free surfactants: To ensure cleaning power, surfactants (such as sulfates and amino acids) in the formula are mostly present in the form of monomers or small micelles. The free state accounts for a high proportion and cannot form stable ordered aggregates; 2. Micellar structure defects: The low viscosity system limits the self-assembly ability of micelles, the coverage area is limited, and the encapsulation and solubilization efficiency of oils (such as sebum and keratin debris) on the scalp surface is low; 3. Excessive degreasing power and irritation: Free surfactants can easily over-penetrate the scalp stratum corneum, damaging the skin barrier (such as dissolving inter-cuticular lipids). At the same time, due to the lack of a buffering mechanism, they directly interact with scalp proteins, leading to problems such as excessive degreasing, dryness, and itching. 4. Residual risk: Free surfactants are difficult to rinse completely, and residual ingredients continue to irritate the scalp. Long-term use may cause inflammation or sensitivity. Summary of the Invention

[0004] To address the problems of existing scalp pre-wash compositions, the present invention provides a scalp pre-wash composition and a preparation method thereof. The scalp pre-wash composition can effectively remove silicone oil flocculation and deposition on the scalp caused by conventional shampoo, and will not cause dryness and cracking of the scalp epidermis due to dryness even after long-term continuous use, thereby inhibiting the occurrence of dandruff caused by dryness.

[0005] A scalp pre-wash composition comprises the following components by mass fraction: 0.1-20% liquid oil, 0.5-20% nonionic surfactant, 1-10% hair surfactant, and 1-80% polyol and / or 1-30% sugar alcohol, wherein the sum of the mass fractions of the above components does not exceed 100%, and the remainder is filler.

[0006] Furthermore, the scalp pre-wash composition comprises the following components by mass fraction: Liquid oil 5%, nonionic surfactant 20%, hair surfactant 10% and polyol 60% and / or sugar alcohol 30%. The sum of the mass fractions of the above components shall not exceed 100%, and the remainder is filler.

[0007] Furthermore, the liquid oil is any one or more combinations of octyl siloxane, dimethicone, caprylic / capric triglyceride, dicaprylyl carbonate, and coconut oil caprylate / caprate.

[0008] Furthermore, the nonionic surfactant is a combination of any one or more of PEG-40 hydrogenated castor oil, PEG-60 hydrogenated castor oil, PEG-80 hydrogenated castor oil, sorbitol polyether-40 tetraoleate, sorbitol polyether-40 tetraisostearate, PEG-20 glyceryl triisostearate, PEG-7 glyceryl cocoate, PEG-6 caprylic / capric glycerides, polysorbate-60, polysorbate-80, polysorbate-85, cocamide MEA, and cocamide methyl MEA.

[0009] Furthermore, the hair surfactant is a combination of any one or more of lauramidopropyl betaine, cocamidopropyl betaine, coco betaine, cocamide hydroxysulfopropyl betaine, disodium cocoamphodiacetate, disodium lauroamphodiacetate, sodium C14-16 olefin sulfonate, sodium laureth sulfate, sodium cocoamidopropionate, and decyl glucoside.

[0010] Furthermore, the polyol is a combination of any one or more of glycerol, propylene glycol, 1-3 trimethylene glycol, 1-3 butylene glycol, and dipropylene glycol.

[0011] Furthermore, the sugar alcohol is any one or more combinations of sorbitol and erythritol.

[0012] Furthermore, the filler is water.

[0013] The present invention also provides a method for preparing the scalp pre-wash composition, comprising: (1) Heat the liquid oil and nonionic surfactant to 70℃~85℃ for pre-dissolution; (2) Add polyols and sugar alcohols and stir evenly; (3) Add water and stir evenly; (4) Adding a hair surfactant, heating and dissolving it uniformly, and then cooling it to room temperature to obtain the scalp pre-wash composition, wherein the heating temperature is 70°C to 85°C.

[0014] Compared to existing technologies, the scalp pre-wash composition and its preparation method of the present invention utilize the principle of oil dissolving oil, employ a bicontinuous phase / liquid crystal formulation system, and combine surfactants for hair and skin with conventional beauty serum ingredients. This allows subjects to experience the same rich lather as hair cleansing products while gently and efficiently cleansing the scalp and hair follicles, effectively removing silicone oil flocculation deposited on the scalp by conventional shampoos. Furthermore, long-term continuous use will not cause dryness or cracking of the scalp epidermis due to dryness, and inhibits the occurrence of dandruff caused by dryness.

[0015] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the special liquid crystal structure of the scalp pre-wash composition in the polarized state according to an embodiment of the present invention.

[0017] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0018] To make the objects, features, and advantages of the present invention more readily apparent, the following detailed description of the specific embodiments of the present invention is provided in conjunction with the following examples. Several embodiments of the present invention are provided in the examples. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these examples are provided to provide a more thorough and comprehensive understanding of the present invention.

[0019] Example 1 This embodiment provides a scalp pre-wash composition, which includes the following components by mass: 5% liquid oil, 20% nonionic surfactant, 10% hair surfactant, and 60% polyol. The total mass fraction of the above components does not exceed 100%, and the remainder is filler.

[0020] The liquid oil is any one or more of octyl siloxane, dimethicone, caprylic / capric triglyceride, dicaprylyl carbonate, and coconut oil alcohol-caprylate / caprate; the nonionic surfactant is PEG-40 hydrogenated castor oil, PEG-60 hydrogenated castor oil, PEG-80 hydrogenated castor oil, sorbitol polyether-40 tetraoleate, sorbitol polyether-40 tetraisostearate, PEG-20 glyceryl triisostearate, PEG- 7-glyceryl cocoate, PEG-6 caprylic / capric glycerides, polysorbate 60, polysorbate 80, polysorbate 85, cocamide MEA, and cocamide methyl MEA are any one or more combinations of the following: the hair surfactant is any one or more combinations of lauramidopropyl betaine, cocamidopropyl betaine, coco betaine, cocamide hydroxysulfopropyl betaine, disodium cocoamphodiacetate, disodium lauroamphodiacetate, sodium C14-16 olefin sulfonate, sodium laureth sulfate, sodium cocoamidopropionate, and decyl glucoside; the polyol is any one or more combinations of glycerol, propylene glycol, 1-3 propylene glycol, 1-3 butylene glycol, and dipropylene glycol; and the filler is deionized water.

[0021] Preferably, the liquid oil is 2.5% polydimethylsiloxane and 2.5% caprylic / capric triglyceride, the nonionic surfactant is 5% PEG-7 glyceryl cocoate and 5% cocamide methyl MEA, the hair surfactant is 2.5% cocamidopropyl betaine, 1.5% sodium C14-16 olefin sulfonate, 1.5% sodium laureth sulfate, 2.5% sodium cocoamidopropionate, 2% decyl glucoside, and the polyol is 60% glycerol.

[0022] Example 2 This embodiment provides a scalp pre-wash composition comprising the following components by mass: 5% liquid oil, 20% nonionic surfactant, 10% hair surfactant, and 30% sugar alcohol. The sum of the mass fractions of the above components does not exceed 100%, and the remainder is filler. This embodiment differs from Example 1 in that no polyol is added in this embodiment.

[0023] Specifically, the sugar alcohol is any one or more combinations of sorbitol and erythritol. Preferably, the added sugar alcohol is 30% sorbitol.

[0024] Example 3 This embodiment provides a scalp pre-wash composition, which includes the following components by mass: 5% liquid oil, 20% nonionic surfactant, 10% hair surfactant, and 60% polyol. The total mass fraction of the above components does not exceed 100%, and the remainder is filler.

[0025] Specifically, the liquid oil is 0.5% caprylylsiloxane, 2.5% polydimethylsiloxane, 1% caprylic / capric triglyceride, 1% dicaprylyl carbonate, and 2% coconut oil caprylate / caprate; the nonionic surfactant is 3% PEG-40 hydrogenated castor oil, 2.5% PEG-60 hydrogenated castor oil, 2.5% PEG-80 hydrogenated castor oil, 2.5% sorbitan polyether-40 tetraoleate, 2.5% sorbitan polyether-40 tetraisostearate, 2.5% PEG-20 glyceryl triisostearate, 0.5% PEG-7 glyceryl cocoate, 0.5% PEG-6 caprylic / capric glycerides, 0.5% polysorbate-60, 0.5% polysorbate-80, 0.5% polysorbate-85, 1% cocamide MEA, and cocamide methyl MEA. 1%; the hair surfactant is 1% lauramidopropyl betaine, 1% cocoamidopropyl betaine, 1% coco betaine, 1% cocoamidohydroxysulfopropyl betaine, 1% disodium cocoamphodiacetate, 1% disodium lauroamphodiacetate, 1% sodium C14-16 olefin sulfonate, 1% sodium laureth sulfate, 1% sodium cocoamidopropionate, and 1% decyl glucoside; the polyol is 30% glycerol, 15% propylene glycol, 5% 1-3 propylene glycol, 5% 1-3 butylene glycol, and 5% dipropylene glycol, and the filler is deionized water.

[0026] Example 4 This embodiment provides a scalp pre-wash composition, which includes the following components by mass fraction: 5% liquid oil, 20% nonionic surfactant, 10% hair surfactant and 30% sugar alcohol, the mass fraction of the above components added does not exceed 100%, and the remainder is filler. The difference between this embodiment and Example 3 is that: in this embodiment, no polyol is added, and the added sugar alcohol is 10% sorbitol and 20% erythritol, and the filler is deionized water.

[0027] Example 5 This embodiment provides a scalp pre-wash composition comprising the following components by mass: 2% liquid oil, 18% nonionic surfactant, 18% hair surfactant, and 1% polyol, wherein the sum of the mass fractions of the above components does not exceed 100%, and the remainder is filler. Specifically, the liquid oil is 2% dicaprylyl carbonate; the nonionic surfactant is 8% PEG-40 hydrogenated castor oil and 10% PEG-7 glyceryl cocoate; the hair surfactant is 10% lauramidopropyl betaine, 2% cocamide methyl MEA, and 6% sodium C14-16 olefin sulfonate; the polyol is 1% glycerol, and the filler is deionized water.

[0028] Example 6 This embodiment provides a scalp pre-wash composition comprising the following components by mass: 2% liquid oil, 6% nonionic surfactant, 25% hair surfactant, and 30% polyol, wherein the sum of the mass fractions of the above components does not exceed 100%, and the remainder is filler. Specifically, the liquid oil is caprylic / capric triglyceride 2%; the nonionic surfactant is PEG-40 hydrogenated castor oil 5% and PEG-7 glyceryl cocoate 1%; the hair surfactant is lauramidopropyl betaine 5%, cocamide MEA 10%, and sodium C14-16 olefin sulfonate 10%; the polyol is glycerol 30%, and the balance is deionized water.

[0029] Example 7 This embodiment provides a scalp pre-wash composition comprising the following components by mass: 0.5% liquid oil, 8.7% nonionic surfactant, 10% hair surfactant, 5% polyol, and 2% sugar alcohol, wherein the sum of the mass fractions of the above components does not exceed 100%, and the remainder is filler. Specifically, the liquid oil is 0.1% caprylylsiloxane, 0.1% polydimethylsiloxane, 0.1% caprylic / capric triglyceride, 0.1% dicaprylyl carbonate, and 0.1% coconut oil caprylate / caprate; the nonionic surfactant is 1% PEG-40 hydrogenated castor oil, 1% PEG-60 hydrogenated castor oil, 1% PEG-80 hydrogenated castor oil, 1% sorbitan polyether-40 tetraoleate, 1% sorbitan polyether-40 tetraisostearate, 1% PEG-20 glyceryl triisostearate, 0.5% PEG-7 glyceryl cocoate, 0.5% PEG-6 caprylic / capric glycerides, 0.5% polysorbate-60, 0.5% polysorbate-80, 0.5% polysorbate-85, 0.1% cocamide MEA, and cocamide methyl MEA. 0.1%; the hair surfactant is lauramidopropyl betaine 1%, cocoamidopropyl betaine 1%, coco betaine 1%, cocoamidohydroxysulfopropyl betaine 1%, disodium cocoamphodiacetate 1%, disodium lauroamphodiacetate 1%, sodium C14-16 olefin sulfonate 1%, sodium laureth sulfate 1%, sodium cocoamidopropionate 1%, and hydroxypropyl glucoside 1%; the polyol is glycerol 1%, propylene glycol 1%, 1-3 propylene glycol 1%, 1-3 butylene glycol 1%, and dipropylene glycol 1%; the sugar alcohol is sorbitol 1% and erythritol 1%.

[0030] Example 8 This embodiment provides a scalp pre-wash composition, which includes the following components by mass fraction: 0.1% liquid oil, 0.5% nonionic surfactant, 1% hair surfactant, and 1% polyol. The sum of the mass fractions of the above components does not exceed 100%, and the remainder is filler.

[0031] Specifically, the liquid oil is 0.1% polydimethylsiloxane, the nonionic surfactant is 0.5% PEG-7 glyceryl cocoate, the hair surfactant is 1% cocamidopropyl betaine, and the polyol is 1% glycerol.

[0032] In some optional embodiments, the liquid oil can also be any one of 0.1% caprylylsiloxane, 0.1% dimethicone, 0.1% caprylic / capric triglyceride, 0.1% dicaprylyl carbonate, and 0.1% coconut oil caprylate / caprate; The nonionic surfactant can also be any one of PEG-40 hydrogenated castor oil 0.5%, PEG-60 hydrogenated castor oil 0.5%, PEG-80 hydrogenated castor oil 0.5%, sorbitol polyether-40 tetraoleate 0.5%, sorbitol polyether-40 tetraisostearate 0.5%, PEG-20 glyceryl triisostearate 0.5%, PEG-6 caprylic / capric glycerides 0.5%, polysorbate-60 0.5%, polysorbate-80 0.5%, polysorbate-85 0.5%, cocamide MEA 0.5%, and cocamide methyl MEA 0.5%.

[0033] The hair surfactant can also be any one of 1% lauramidopropyl betaine, 1% coco betaine, 1% cocoamidohydroxysulfopropyl betaine, 1% disodium cocoamphodiacetate, 1% disodium lauroamphodiacetate, 1% sodium C14-16 olefin sulfonate, 1% sodium laureth sulfate, 1% sodium cocoamidopropionate, and 1% decyl glucoside; The polyol may also be any one of propylene glycol 1%, 1-3 propylene glycol 1%, 1-3 butylene glycol 1%, and dipropylene glycol 1%.

[0034] Example 9 This embodiment provides a scalp pre-wash composition, comprising the following components by mass: 0.1% liquid oil, 0.5% nonionic surfactant, 1% hair surfactant, and 1% sugar alcohol. The sum of the mass fractions of the above components does not exceed 100%, and the remainder is filler. This embodiment differs from Example 8 in that no polyol is added in this embodiment, and the sugar alcohol is 1% sorbitol.

[0035] In some optional embodiments, the sugar alcohol may also be erythritol 1%.

[0036] Example 10 This embodiment provides a scalp pre-wash composition, comprising the following components by mass: 0.1% liquid oil, 0.5% nonionic surfactant, and 1% hair surfactant. The sum of the mass fractions of the above components does not exceed 100%, and the remainder is filler. This embodiment differs from Example 8 in that the mass fraction of the polyol is 80%, and the polyol is any one of glycerol, propylene glycol, 1-3 propanediol, 1-3 butanediol, and dipropylene glycol.

[0037] Example 11 This embodiment provides a scalp pre-wash composition, comprising the following components by mass: 0.1% liquid oil, 0.5% nonionic surfactant, and 1% hair surfactant. The sum of the mass fractions of the above components does not exceed 100%, and the remainder is filler. This embodiment differs from Example 8 in that no polyol is added in this embodiment, and the mass fraction of the sugar alcohol is 30%. The sugar alcohol is either sorbitol or erythritol.

[0038] Example 12 This embodiment provides a scalp pre-wash composition, comprising the following components by mass: 20% liquid oil, 20% nonionic surfactant, 10% hair surfactant, and 1% polyol. The sum of the mass fractions of the above components does not exceed 100%, and the remainder is filler. This embodiment differs from Example 8 in that the mass fractions of the liquid oil, nonionic surfactant, and hair surfactant are different.

[0039] Example 13 This embodiment provides a scalp pre-wash composition, comprising the following components by mass: 20% liquid oil, 20% nonionic surfactant, 10% hair surfactant, and 30% sugar alcohol. The sum of the mass fractions of the above components does not exceed 100%, and the remainder is filler. This embodiment differs from Example 11 in that the mass fraction of the added sugar alcohol is different.

[0040] Comparative Example 1 This comparative example 1 provides a commercially available scalp pre-wash composition, comprising water, sodium C14-16 olefin sulfonate, cocamidopropyl betaine, sodium cocoamidopropionate, sodium methyl cocoyl taurate, fragrance, glycerin, sodium benzoate, and citric acid.

[0041] Comparative Example 2 This comparative example 1 provides a commercially available scalp pre-wash composition, comprising water, sodium laureth sulfate, glycerin, sodium C14-16 olefin sulfonate, sodium chloride, ammonium lauryl sulfate, cocamidopropyl betaine, cocamidomethyl MEA, fragrance, phenoxyethanol, butylene glycol, oleamidopropyl PG-dimonium chloride, disodium EDTA, and citric acid.

[0042] The detergency, mildness, and foaming properties of the scalp pre-wash composition in the above examples were evaluated as follows: 1. Sebum Cleansing Rate Test 1. Experimental instruments: METTLER TOLEDO balance, 85℃ drying oven, Panasonic hair dryer 2. Experimental materials: Healthy Asian human hair bundle, approximately 16g, W55mm, H210mm (BEAULAX CO., LTD.), a commercially available comb, and artificial sebum (composition: soybean oil 48%, oleic acid 13%, myristic acid 12%, squalene 12%, paraffin 10%, glyceryl oleate 3%, and cholesterol stearate 2%). 3. Test conditions: room temperature (25±2℃), water temperature 40±2℃ 4. Test sample size: 3 hair bundles for the control group and 3 hair bundles for the experimental group 5. Test method: Statistics a) Use 30% fatty alcohol polyoxyethylene ether sodium sulfate aqueous solution to clean the hair bundle, blow dry with a hair dryer, let it stand for 5 minutes, and then weigh it. b) 1.0 g of artificial sebum or oleic acid was applied to the hair bundles of both the control group and the experimental group, and the amount applied was accurately weighed. c) The control group hair bundles were smeared with 1.5 g of the commercial product in the control example, and the experimental group hair bundles were smeared with 1.5 g of all the scalp pre-wash compositions in this example.

[0043] d) Process the hair (comb the hair 5 times, rinse and comb the hair 5 times, stop rinsing and combing the hair 3 times, dry the hair naturally until the next day, and then put it in a drying oven at 85℃ for 10 minutes). e) Weigh the dried hair bundle and calculate the weight of the artificial sebum washed away. The data were averaged.

[0044] 6. Experimental results (the control group is represented by A, A1 represents hair bundle 1 of the control group; the experimental group is represented by B, B1 represents hair bundle 1 of the experimental group): Table 1

[0045] 2. Mildness Test 1. Zein solubility test 2. Experimental Materials: Zein (Ichimaru PHARCOS Co., Ltd.) 3. Test conditions: room temperature (25±2℃), water temperature 40±2℃ 4. Test sample size: The control group was tested 3 times, and the experimental group was tested 3 times. 5. Test method: a) Prepare 100g of 10% aqueous solution of the test shampoo and stir for 10 minutes. b) If flocs are produced, filter them; if no flocs are produced, do not filter them. c) Add 1 g of zein to the filtrate and stir for 1 hour. d) Filter the shampoo mixture through a funnel, and place the filter paper containing undissolved zein in an 80° C. thermostat for 6 hours. e) Calculate the zein solubility rate by weighing the undissolved zein. f) The same experiment was performed 3 times and the average value was taken. 6. Statistics: The data were tested for normal distribution. If they met the normal distribution requirements, the paired t-test was used for comparison before and after the data were used; otherwise, the two-related sample rank sum test was used; the two-related sample rank sum test was used for comparison before and after the data were used; the statistical significance level was p < 0.05.

[0046] The experimental results are as follows: Table 2

[0047] 3. Foaming performance: 1. Roche foam meter to test foam height 2. Experimental materials: Roche foam meter, balance, volumetric flask, pipette, 1000ml beaker, constant temperature water bath, thermometer, stirring rod, hard water, purified water.

[0048] 3. Test conditions: room temperature (25±2℃), water temperature 40±2℃ 4. Test sample size: 1 test for each of the control group and experimental group 5. Test method: 1) Turn on the thermostat and wait for it to rise to the set temperature, usually 40℃±0.5℃, to ensure the temperature of the tube jacket water bath is stable.

[0049] 2) Use distilled water to clean the inner wall of the graduated tube, ensuring it is thoroughly rinsed. Then rinse the tube wall with the test liquid, also ensuring it is thoroughly rinsed.

[0050] 3) Close the piston of the graduated tube and use another dropper to add 50mL of test solution to the 50mL mark in the graduated tube. The test solution must be preheated to 40℃.

[0051] 4) Use a dropper to fill with 200mL of test solution, which is also preheated to 40℃.

[0052] 5) Place the dropper on the tube rack, perpendicular to the cross section of the graduated tube, ensuring that the solution flows to the center of the graduated tube. The outlet of the dropper should be on the 900mm mark.

[0053] 6) Press the plunger of the dropper to allow the solution to begin to fall. When the solution in the dropper is exhausted, immediately start a stopwatch and measure the foam height. Record the foam height at 5, 10, and 15 minutes. This represents the foam performance value.

[0054] 7) Repeat the above test at least twice. Be sure to thoroughly clean the inner wall of the instrument before each test to prevent affecting the accuracy of the data. At this time, the reading should be based on the approximate average height of the foam surface.

[0055] The experimental results are as follows: Table 3

[0056] Furthermore, all the scalp pre-wash compositions in this example were distributed to 10 groups of subjects for use testing and evaluation.

[0057] in: 1. Ten groups of subjects, 30 in each, completed the test, and 30 had valid test data. Subject Description: Aged 18-50, with sensitive scalps, dry scalps, and dandruff. Validity Criteria for Test Items: Five response options were set: "1. Strongly Agree," "2. Agree," "3. Uncertain," "4. Disagree," and "5. Strongly Disagree." The cumulative percentage of responses to options "1" and "2" was calculated as the satisfaction rate.

[0058] 1. The subjects found that the product had an effect on reducing dandruff after using it; 2. Moisturizing effect on scalp after use; 3. It can relieve scalp tension after use; 4. Good cleaning effect 2. Collect the satisfaction evaluation of each subject on the project according to the above rules, fill in the questionnaire, and judge whether the product has the effect of removing dandruff based on the percentage of satisfaction (number of people who strongly agree and agree).

[0059] 3. Results and Conclusions After 28 days of using the product, 1. 100.0% of the subjects felt that Product A had the effect of reducing dandruff. 2. 96.7% of the subjects felt that Product A had a moisturizing effect on the scalp; 3. 96.7% of the subjects felt that Product A relieved scalp tension after use; 4. 100.0% of the subjects felt that the product had a good cleaning effect; The test results were obtained from 30 groups of subjects with sensitive scalp, allergic scalp, dry scalp and dry dandruff, indicating that the scalp pre-wash composition has the effect of removing dandruff and moisturizing.

[0060] Furthermore, all the scalp pre-wash compositions in this example and the commercially available products in the above-mentioned comparative examples 1 and 2 were distributed to 10 groups of subjects for use testing and evaluation.

[0061] After four and eight weeks of use, scalp photographs were taken for each group of subjects. The measured values and differences at each time point were tested for normal distribution. If a normal distribution was observed, a t-test was performed. If a non-normal distribution was observed, a Wilcoxon test was performed for before-and-after comparisons, and a Mann-Whitney test was performed for between-group comparisons. A two-sample rank sum test was used for before-and-after comparisons, and an independent sample t-test or rank sum test was used for between-group comparisons. The obtained results were compared with those obtained using commercially available products to determine the moisturizing and anti-dandruff rates. The corresponding results are shown in Table 4: Table 4

[0062] The present invention also provides a method for preparing the above-mentioned scalp pre-wash composition, comprising: (1) Heat the liquid oil and nonionic surfactant to 70℃~85℃ for pre-dissolution; (2) Add polyols and sugar alcohols and stir evenly; (3) Add water and stir evenly; (4) Adding a hair surfactant, heating and dissolving it uniformly, and then cooling it to room temperature to obtain the scalp pre-wash composition, wherein the heating temperature is 70°C to 85°C.

[0063] See also Figure 1 , showing the unique liquid crystal structure of the scalp pre-wash composition in this embodiment under polarized light. In this embodiment, a breakthrough improvement in scalp cleansing is achieved by constructing a liquid crystal phase or a bicontinuous phase structure, specifically: 1. Self-assembled large-area micelle network to improve cleaning efficiency and targeting Liquid crystal structures are formed by self-assembly of surfactants, co-surfactants (such as polyols, sugar alcohols) and water through intermolecular forces, and have an ordered layered or network structure: The micelle size can reach micrometers, forming a continuous three-dimensional network that can cover a large area of the scalp surface. Through the "wrapping-stripping" mechanism, it can effectively capture oil and dirt and avoid the disordered penetration of free surfactants. The bilayer structure of the liquid crystal phase is similar to the lipid arrangement of the scalp stratum corneum, and can target and absorb sebum through biomimetic effects (see cleaning experiment). Its solubilization ability is improved compared to conventional small micelles, and it only targets excess oil, avoiding damage to the healthy stratum corneum.

[0064] 2. Reduce the content of free surfactants to achieve gentle cleansing The stable framework of the liquid crystal structure can fix the surfactant in the ordered aggregates, minimizing the concentration of free surfactant: The immobilized surfactants perform their cleaning function through collective action, reducing direct contact with scalp proteins; Referring to the experiment on zein, the denaturation rate of the liquid crystal system of the present invention on protein is extremely low, while the denaturation rate of conventional cleaning liquid is as high as 90%, proving that its irritation is significantly reduced.

[0065] 3. Balance low viscosity with structural stability, breaking the contradiction between "viscosity and efficacy" In conventional systems, "low viscosity" and "ordered structure" are difficult to coexist. However, this embodiment achieves a balance through the following design: Low molecular weight polyols and sugar alcohols are used to adjust the interlayer spacing of the liquid crystal phase, so that the system viscosity is controlled at 500-1000mPa•s (meeting the needs of scalp use) while maintaining the integrity of the liquid crystal and bicontinuous structure; The shear-thinning properties of the liquid crystal phase (viscosity decreases when sheared by external force and recovers after standing) ensure fluidity during application, and it is not easy to demulsify during rinsing, reducing residue.

[0066] This embodiment breaks through the technical contradictions of "low viscosity and high cleaning power" and "efficient cleaning and mildness" by introducing liquid crystals and bicontinuous phase self-assembly structures. By utilizing the ordered aggregate characteristics of the liquid crystal phase, the "destructive cleaning" of surfactants is transformed into a bionic cleaning mode of "targeted wrapping-gentle peeling", fundamentally solving the problems of excessive free surfactants, strong irritation and high residual risk in existing products, and providing a new solution for long-term care of people with sensitive scalps and oily scalps.

[0067] In summary, the scalp pre-cleanse composition and its preparation method in the above-mentioned embodiments of the present invention utilize the principle of oil dissolving oil, employ a bicontinuous phase / liquid crystal formulation system, and combine hair and skin surfactants with conventional beauty serum ingredients. This allows subjects to experience the same rich lather as hair cleansing products while gently and efficiently cleansing the scalp and hair follicles. It effectively removes silicone oil deposits deposited on the scalp by conventional shampoos, and even with long-term continuous use, it prevents dryness and cracking of the scalp epidermis due to dryness, thereby suppressing the occurrence of dandruff caused by dryness.

[0068] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0069] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A scalp pre-wash composition, characterized in that: The following components are included by mass fraction: 0.1-20% liquid oil, 0.5-20% nonionic surfactant, 1-10% hair surfactant and 1-80% polyol and / or 1-30% sugar alcohol, the sum of the mass fractions of the above components does not exceed 100%, and the balance is filler.

2. The scalp pre-wash composition according to claim 1, characterized in that The scalp pre-wash composition comprises the following components by mass fraction: Liquid oil 5%, nonionic surfactant 20%, hair surfactant 10% and polyol 60% and / or sugar alcohol 30%. The sum of the mass fractions of the above components shall not exceed 100%, and the remainder is filler.

3. The scalp pre-wash composition according to claim 1, characterized in that The liquid oil is any one or more combinations of octyl siloxane, dimethicone, caprylic / capric triglyceride, dicaprylyl carbonate, and coconut oil alcohol-caprylate / caprate.

4. The scalp pre-wash composition according to claim 1, characterized in that The nonionic surfactant is any one or more of PEG-40 hydrogenated castor oil, PEG-60 hydrogenated castor oil, PEG-80 hydrogenated castor oil, sorbitol polyether-40 tetraoleate, sorbitol polyether-40 tetraisostearate, PEG-20 glyceryl triisostearate, PEG-7 glyceryl cocoate, PEG-6 caprylic / capric glycerides, polysorbate-60, polysorbate-80, polysorbate-85, cocamide MEA, and cocamide methyl MEA.

5. The scalp pre-wash composition according to claim 1, wherein The hair surfactant is any one or more of lauramidopropyl betaine, cocamidopropyl betaine, coco betaine, cocamide hydroxysulfopropyl betaine, disodium cocoamphodiacetate, disodium lauroamphodiacetate, sodium C14-16 olefin sulfonate, sodium laureth sulfate, sodium cocoamidopropionate, and decyl glucoside.

6. The scalp pre-wash composition according to claim 1, characterized in that The polyol is any one or more combinations of glycerol, propylene glycol, 1-3 trimethylene glycol, 1-3 butylene glycol, and dipropylene glycol.

7. The scalp pre-wash composition according to claim 1, characterized in that The sugar alcohol is any one or more combinations of sorbitol and erythritol.

8. The scalp pre-wash composition according to claim 1, characterized in that The filler is water.

9. The method for preparing the scalp pre-wash composition according to any one of claims 1 to 8, characterized in that: include: (1) Heat the liquid oil and nonionic surfactant to 70℃~85℃ for pre-dissolution; (2) Add polyols and sugar alcohols and stir evenly; (3) Add water and stir evenly; (4) Adding a hair surfactant, heating and dissolving it uniformly, and then cooling it to room temperature to obtain the scalp pre-wash composition, wherein the heating temperature is 70°C to 85°C.

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