A solid composition for scalp hair care and a method of preparing and using the same

Abstract

This invention provides a solid composition for scalp and hair care, its preparation method, and its application, belonging to the field of daily chemical technology. The solid composition for scalp and hair care comprises 20-35 parts of a molding agent, 10-30 parts of a cleanser, 3-12 parts of a conditioning agent, 0.5-3.5 parts of a stabilizer, 0.3-2.5 parts of a sensory agent, 0.01-1.5 parts of a functional agent, and a matrix to a total of 100 parts. The conditioning agent includes the following components: 0.5-1 parts of purified water, 1-50 parts of glycerin, 0.1-5 parts of propylene glycol, 0.1-5 parts of castor oil, and 0.1-0... 0.5 parts isopropyl myristate, 0.5-4 parts docosyltrimethylammonium chloride, 0.1-1.5 parts guar hydroxypropyltrimethylammonium chloride, 0.1-1.5 parts polyquaternium-10, and 0.5-10 parts polydimethylsiloxane; This formula, by limiting the particle size of the emulsion microparticles, can effectively avoid the aggregation of oily components, ensure the uniform adhesion of hair care ingredients, and improve hair smoothness; This solid composition for scalp and hair care is a new type of product that combines excellent hair care uniformity, effective flocculation performance, moldability and functional adaptability, and regulation of scalp microecology.

Description

Technical Field

[0001] This invention belongs to the field of daily chemical technology, and particularly relates to a solid composition for scalp and hair care, its preparation method and application. Background Technology

[0002] Shampoo bars are an important type of cleaning and care product in the daily chemical industry. With their advantages such as portability, environmental friendliness, no risk of liquid leakage, and stable product properties, they are widely used in various scenarios such as daily cleaning, outdoor travel, and fitness.

[0003] Existing technologies face numerous technical bottlenecks in the development of shampoo bars, making it difficult to balance functionality and product stability. Firstly, oily hair-care components (such as polydimethylsiloxane) tend to agglomerate in low-water-content solid systems, resulting in poor dispersion and uneven hair-care effects during use. Secondly, the inherent properties of high-concentration surfactants and low water content in solid soaps fundamentally contradict the "fully swollen cationic polysaccharide polymer and low-concentration surfactant system" required by existing flocculation technologies, hindering effective flocculation. Thirdly, it is difficult to balance molding stability and flocculation compatibility in shampoo bars, leading to products that either have poor molding properties or lack hair-care functions. Fourthly, existing products cause scalp microecological problems, failing to meet user needs.

[0004] The aforementioned limitations indicate that there is still a need to research new product systems that combine excellent hair care uniformity, effective flocculation performance, shape and function adaptability, and adjustment of the microecology. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention provides a solid composition for scalp and hair care, its preparation method, and its application.

[0006] This invention relates in one aspect to a solid composition for scalp and hair care, comprising, by weight, the following components: 20-35 parts molding agent, 10-30 parts cleaning agent, 3-12 parts conditioning agent, 0.5-3.5 parts stabilizer, 0.3-2.5 parts sensory agent, 0.01-1.5 parts functional agent, and matrix to make up to 100 parts; The conditioner comprises the following components: 0.5-1 part purified water, 1-50 parts glycerin, 0.1-5 parts propylene glycol, 0.1-5 parts castor oil, 0.1-0.5 parts isopropyl myristate, 0.5-4 parts docosyltrimethylammonium chloride, 0.1-1.5 parts guar hydroxypropyltrimethylammonium chloride, 0.1-1.5 parts polyquaternium-10, and 0.5-10 parts polydimethylsiloxane; The polydimethylsiloxane, in the form of emulsion microparticles with an average particle size of 20-45 μm, is dispersed in the solid composition for scalp and hair care.

[0007] Furthermore, the functional agent is selected from one or more of pyridone ethanolamine salt, selenium disulfide, clomiphene, salicylic acid, and anti-hair loss active ingredients.

[0008] Furthermore, the functional agent comprises pyridone ethanolamine salt, selenium disulfide, clomibazole and salicylic acid in a weight ratio of 2:1:1:1.

[0009] Furthermore, the molding agent includes 16 / 18 alcohol, stearic acid, and ethylene glycol distearate.

[0010] Furthermore, the stabilizer is characterized by comprising the following components: The ingredients are 0.5-2 parts hydroxypropyl methylcellulose, 0.2-0.5 parts phenoxyethanol, 0.2-0.4 parts sodium benzoate, 0.1-0.5 parts disodium ethylenediaminetetraacetate, 0.01-0.7 parts citric acid, 0.01-0.2 parts sodium citrate, and 0.01-0.2 parts sodium thiosulfate; and the total amount of sodium benzoate, sodium citrate, and sodium thiosulfate shall not exceed 0.5 parts.

[0011] Furthermore, the cleaning agent comprises 10-20 parts sodium methyl lauroyl taurate and 0.1-2 parts cocamidomethyl MEA.

[0012] Furthermore, the sensory agent comprises 0.01-0.4 parts menthol and 0.3-2 parts flavoring.

[0013] Furthermore, the matrix is ​​sodium cocoyl ethanesulfonate.

[0014] The present invention also relates to a method for preparing the aforementioned solid composition for scalp and hair care, comprising the following steps: (1) The solid components of the molding agent, cleaning agent, stabilizer, sensory agent, functional agent and conditioning agent are crushed separately, passed through an 80-100 mesh sieve, and placed in a three-dimensional motion mixer. They are mixed for 15-25 minutes at a speed of 300-500 r / min to obtain a uniform solid powder. (2) Take the polydimethylsiloxane in the conditioner, add the pure water and the matrix in the conditioner, and then emulsify it to prepare a silicone oil emulsion with a particle size of 20~45μm. After emulsification, cool it to room temperature for later use. (3) The silicone oil emulsion cooled in step (2) is mixed with the molding agent, the cleaning agent, the stabilizer, the sensory agent, the functional agent and the remaining liquid components of the conditioning agent, and stirred until the system is free of stratification and particles to obtain a homogeneous liquid conditioning mixture; (4) Slowly add the liquid conditioning mixture obtained in step (3) to the solid powder in step (1) while adding it dropwise and stirring at a speed of 400-600 r / min. After the addition is completed, continue mixing for 10-15 min to obtain loose powder. The system is a uniform loose powder with no lumps or sticking to the wall. (5) The loose powder is placed in a stamping mold and pressed into shape under a pressure of 5-8 MPa and a holding time of 3-5 s. After demolding, it is placed in an environment with a temperature of 25-30℃ and a relative humidity of 40%-60% and left to dry for 24-48 hours to obtain the solid composition for scalp and hair care.

[0015] Furthermore, the specific conditions for emulsification in step (2) are: emulsification for 20-40 minutes at a temperature of 45-55℃ and a rotation speed of 800-1200r / min.

[0016] The present invention also relates to the application of the solid composition for scalp and hair care described herein, or the solid composition for scalp and hair care prepared by the aforementioned preparation method, in scalp and hair care.

[0017] The beneficial effects of this invention are: This invention discloses a solid composition for scalp and hair care, comprising a molding agent, a cleansing agent, a conditioning agent, a stabilizer, a sensory agent, a functional agent, and a matrix in a specific ratio. The polydimethylsiloxane in the conditioning agent is dispersed in the form of 20-45 μm emulsion particles, effectively preventing the aggregation of oily components, ensuring uniform adhesion of the hair care ingredients, and improving hair smoothness. Simultaneously, the synergistic effect of flocculating components such as cationic polysaccharide polymers in the conditioning agent achieves effective flocculation in a low-water, high-surface-active solid system, improving the difficulty of swelling and poor adsorption of cationic polysaccharide polymers. This solid composition for scalp and hair care combines soap-like stability and excellent hair care function; further enhanced by the functional agent components, it effectively inhibits Malassezia, resulting in a product with comprehensive characteristics of uniform hair care, effective flocculation, stable molding, and regulation of the scalp microecology. Detailed Implementation

[0018] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Unless otherwise specified, the raw materials, reagents, or apparatus used in the following embodiments are readily available from conventional commercial sources or can be obtained by existing known methods. Experimental methods not specifically described are generally performed under conventional conditions or as recommended by the manufacturer. Unless otherwise stated, parts and percentages are parts by weight and weight percentages.

[0019] Preparation Example 1: Weigh the corresponding raw materials according to the composition ratio listed in Table 1 to prepare different efficacy agent samples F1-F16.

[0020] Table 1 Composition ratio of samples F1-F16

[0021] Malassezia inhibition tests were performed on the prepared samples F1 to F16. According to the strain passage instructions, *Malassezia furfur* was activated and passaged twice using LN medium, resulting in a viable cell count of approximately 10-1. 6 The bacterial suspension was prepared by centrifugation, washing with PBS, and then the bacterial concentration was increased to cfu / mL. The inhibition rate of samples F1 to F16 against Malassezia was tested by colony counting according to the appendix of GB15979-2002 "Hygienic Standard for Disposable Sanitary Products".

[0022] Inhibition rate (%) = [(number of colonies in control sample - number of colonies in test sample) / number of colonies in control sample] × 100%.

[0023] Evaluation criteria: An inhibition rate of ≥50%–90% indicates that the sample has antibacterial effect; an inhibition rate of ≥90% indicates that the sample has a strong antibacterial effect. The test results are shown in Table 2.

[0024] Table 2. Malassezia inhibition rate of samples F1 to F16

[0025] As shown in Table 2, pyridone ethanolamine salt (F16) alone has a certain inhibitory effect on Malassezia, and the inhibitory effect increases with time. Compared with pyridone ethanolamine salt (F16) alone, when the active agent pyridone ethanolamine salt is combined with other active agents (selenium disulfide, clomiphene, and salicylic acid) in a specific ratio (F1), the overall antibacterial effect of the composition is enhanced, and Malassezia can be killed rapidly (F1 can achieve an inhibition rate of about 90% in 5 minutes, while other samples require 10 minutes or longer). In addition, changing the ratio of selenium disulfide, clomiphene, and salicylic acid (F2-F7, F8-F10, F13-F15) or changing the dosage ratio of pyridone ethanolamine salt with selenium disulfide, clomiphene, and salicylic acid (F11-F12, F16) cannot achieve the same enhanced and rapid antibacterial effect. Therefore, the following embodiments of this scheme all use the F1 efficacy agent ratio to prepare solid compositions for scalp and hair care.

[0026] The above-mentioned active ingredient composition may also contain additional anti-hair loss active ingredients, such as nicotinamide, saw palmetto extract, ginseng extract, etc., for the purpose of preventing hair loss.

[0027] Example Example 1:

[0028] A solid composition for scalp and hair care, with the following components in the following amounts: Molding agent (30 parts): 10 parts 16 / 18 alcohol, 4 parts stearic acid, 16 parts ethylene glycol distearate (polyol long carbon chain ester). Cleaning agent (13 parts): 12 parts sodium methyl lauroyl taurate (anionic surfactant), 1 part cocamide methyl MEA; Conditioner (9.5 parts): 0.5 parts purified water, 3 parts glycerin, 2 parts propylene glycol, 0.5 parts castor oil, 0.5 parts isopropyl myristate, 1 part docosyltrimethylammonium chloride, 0.5 parts guar hydroxypropyltrimethylammonium chloride, 0.5 parts polyquaternium-10, 1 part polydimethylsiloxane; Stabilizer (2.3 parts): 1 part hydroxypropyl methylcellulose, 0.4 parts phenoxyethanol, 0.3 parts sodium benzoate (a weak acid-strong base salt), 0.2 parts disodium ethylenediaminetetraacetate, 0.2 parts citric acid, 0.1 parts sodium citrate (a weak acid-strong base salt), and 0.1 parts sodium thiosulfate (a weak acid-strong base salt); the total amount of sodium benzoate, sodium citrate, and sodium thiosulfate is 0.5 parts, and the ratio of the three is 3:1:1; Sensory agents (0.6 parts): 0.1 parts menthol, 0.5 parts flavoring; Functional agents (1.0 part): 0.4 parts pyridone ethanolamine salt, 0.2 parts selenium disulfide, 0.2 parts clomiphene, 0.2 parts salicylic acid; Matrix: Sodium cocoyl ethanesulfonate, make up to 100 parts.

[0029] In this embodiment, the solid composition for scalp and hair care is prepared according to the following steps: (1) Preparation of solid powder: The solid components of the above-mentioned molding agent, cleaning agent, stabilizer, sensory agent and functional agent are crushed separately, passed through an 80-mesh sieve, and placed in a three-dimensional motion mixer. They are mixed at 300 r / min for 15 min to obtain a uniform solid powder. The solid components include: 16 / 18 alcohol, stearic acid, ethylene glycol distearate, sodium methyl lauroyl taurate, cocamidomethyl MEA, hydroxypropyl methylcellulose, sodium benzoate, disodium ethylenediaminetetraacetate, citric acid, sodium citrate, sodium thiosulfate, menthol, pyridone ethanolamine salt, selenium disulfide, clomiphene, and salicylic acid. (2) Preparation of silicone oil emulsion: Take 0.5 parts of polydimethylsiloxane, add 0.5 parts of pure water and 43.98 parts of sodium cocoyl hydroxyethanesulfonate, emulsify at 50℃ and 1000 r / min for 30 min to prepare a silicone oil emulsion with an average particle size of 30 μm, and cool to room temperature for later use. (3) Preparation of liquid conditioning mixture: The cooled silicone oil emulsion is sequentially mixed with the molding agent, the cleaning agent, the stabilizer, the sensory agent, the functional agent, and the liquid component of the conditioning agent. The mixture is stirred at a constant temperature of 40°C until there is no layering or particles. The stirring speed is 300 r / min and the stirring time is 10 min to obtain a homogeneous liquid conditioning mixture. The liquid components include glycerol, propylene glycol, castor oil, isopropyl myristate, docosyltrimethylammonium chloride, guar hydroxypropyltrimethylammonium chloride, polyquaternium-10, phenoxyethanol, and fragrance. (4) Solid-liquid mixing: The liquid conditioning mixture obtained in step (3) is slowly added dropwise to the solid powder in step (1), while stirring at 400 r / min. After the addition is completed, continue mixing for 15 min to obtain a uniform loose powder. (5) Molding and drying: The loose powder is placed into a stamping mold and pressed into shape under a pressure of 5MPa and a holding time of 3s. After demolding, it is placed in an environment of 25℃ and 40% relative humidity for 24h to dry and obtain solid composition sample A1 for scalp and hair care.

[0030] Example 2: Different silicone oil emulsions in the preparation process A solid composition for scalp and hair care, with the same component dosage as in Example 1; The difference between the preparation steps of the solid composition for scalp and hair care described in this embodiment and those in Example 1 is as follows: Step (2) in this embodiment is: take polydimethylsiloxane from the conditioning agent, add pure water and the matrix from the conditioning agent, emulsify for 20 minutes at a temperature of 50°C and a rotation speed of 600 r / min to prepare a silicone oil emulsion with a particle size of 45 μm, and cool to room temperature after emulsification; the remaining steps are completely consistent with those in Example 1 to obtain solid composition sample A2 for scalp and hair care.

[0031] Example 3: Different preparation process parameters A solid composition for scalp and hair care, with the same component dosage as in Example 1; The difference between the preparation steps of the solid composition for scalp and hair care described in this embodiment and those in Example 1 is as follows: Step (2) in this embodiment is: take polydimethylsiloxane from the conditioning agent, add pure water and the matrix from the conditioning agent, emulsify at 50°C and 1400 r / min for 40 min to prepare a silicone oil emulsion with an average particle size of 20 μm, and cool to room temperature for later use; the remaining steps are completely consistent with those in Example 1, and a solid composition sample A3 for scalp and hair care is obtained.

[0032] Comparative example: Comparative Example 1: The difference from Example 1 lies in the changes in preparation process parameters and the different particle sizes of the silicone oil emulsion. A solid composition for scalp and hair care, with the same component amounts as in Example 2; The difference between the preparation steps and those of Example 1 is that in step (2) of this comparative example, the emulsification conditions are: 45℃, 500r / min emulsification for 20min to prepare a silicone oil emulsion with an average particle size of 50μm, and cooling to room temperature for later use; the remaining steps are completely consistent with those of Example 1; and a solid composition sample D1 for scalp and hair care is obtained.

[0033] Comparative Example 2: The difference from Example 1 lies in the changes in process parameters and the different particle size of the silicone oil emulsion: A solid composition for scalp and hair care, with the same component amounts as in Example 1; The difference between its preparation steps and those of Example 1 is that in step (2) of this comparative example, the emulsification conditions are: 45℃, 1500r / min emulsification for 20min to prepare a silicone oil emulsion with an average particle size of 10μm, and cooling to room temperature for later use; the remaining steps are completely consistent with those of Example 1; and a solid composition sample D2 for scalp and hair care is obtained.

[0034] Comparative Example 3: The difference from Example 1 is that the total amount of sodium benzoate, sodium citrate and sodium thiosulfate in the raw materials is 0.6, and the ratio of the three is 3:1:2; A solid composition for scalp and hair care, with the following components in the following amounts: Molding agent (30 parts): 10 parts 16 / 18 alcohol, 4 parts stearic acid, 16 parts ethylene glycol distearate; Cleaning agent (13 parts): 12 parts sodium methyl lauroyl taurate, 1 part cocamide methyl MEA; Conditioner (9.5 parts): 0.5 parts purified water, 3 parts glycerin, 2 parts propylene glycol, 0.5 parts castor oil, 0.5 parts isopropyl myristate, 1 part docosyltrimethylammonium chloride, 0.5 parts guar hydroxypropyltrimethylammonium chloride, 0.5 parts polyquaternium-10, 1 part polydimethylsiloxane; Stabilizer (2.4 parts): 1 part hydroxypropyl methylcellulose, 0.4 parts phenoxyethanol, 0.3 parts sodium benzoate, 0.2 parts disodium ethylenediaminetetraacetate, 0.2 parts citric acid, 0.1 parts sodium citrate, 0.2 parts sodium thiosulfate; Sensory agents (0.6 parts): 0.1 parts menthol, 0.5 parts flavoring; Functional agents (1.0 part): 0.4 parts pyridone ethanolamine salt, 0.2 parts selenium disulfide, 0.2 parts clomiphene, 0.2 parts salicylic acid; Matrix: Sodium cocoyl ethanesulfonate, make up to 100 parts.

[0035] A solid composition for scalp and hair care was prepared according to the above formula, and the preparation steps were exactly the same as in Example 1, resulting in sample D3 of the solid composition for scalp and hair care.

[0036] Comparative Example 4: The difference from Example 1 is that sodium benzoate, sodium citrate, and sodium thiosulfate are not added to the raw materials. A solid composition for scalp and hair care, with the following components in the following amounts: Molding agent (30 parts): 10 parts 16 / 18 alcohol, 4 parts stearic acid, 16 parts ethylene glycol distearate; Cleaning agent (13 parts): 12 parts sodium methyl lauroyl taurate, 1 part cocamide methyl MEA; Conditioner (9.5 parts): 0.5 parts purified water, 3 parts glycerin, 2 parts propylene glycol, 0.5 parts castor oil, 0.5 parts isopropyl myristate, 1 part docosyltrimethylammonium chloride, 0.5 parts guar hydroxypropyltrimethylammonium chloride, 0.5 parts polyquaternium-10, 1 part polydimethylsiloxane; Stabilizer (2.3 parts): 1 part hydroxypropyl methylcellulose, 0.5 parts phenoxyethanol, 0.4 parts disodium ethylenediaminetetraacetate, 0.4 parts citric acid; Sensory agents (0.6 parts): 0.1 parts menthol, 0.5 parts flavoring; Functional agents (1.0 part): 0.4 parts pyridone ethanolamine salt, 0.2 parts selenium disulfide, 0.2 parts clomiphene, 0.2 parts salicylic acid; Matrix: Sodium cocoyl ethanesulfonate, make up to 100 parts.

[0037] A solid composition for scalp and hair care was prepared according to the above formula, and the preparation steps were completely consistent with those in Example 1, resulting in sample D4 of the solid composition for scalp and hair care.

[0038] Comparative Example 5: The difference from Example 1 is that ethylene glycol distearate is not added to the molding agent. A solid composition for scalp and hair care, with the following components in the following amounts: Molding agent (30 parts): 18 parts 16 / 18 alcohol, 12 parts stearic acid; Cleaning agent (13 parts): 12 parts sodium methyl lauroyl taurate, 1 part cocamide methyl MEA; Conditioner (9.5 parts): 0.5 parts purified water, 3 parts glycerin, 2 parts propylene glycol, 0.5 parts castor oil, 0.5 parts isopropyl myristate, 1 part docosyltrimethylammonium chloride, 0.5 parts guar hydroxypropyltrimethylammonium chloride, 0.5 parts polyquaternium-10, 1 part polydimethylsiloxane; Stabilizer (2.3 parts): 1 part hydroxypropyl methylcellulose, 0.4 parts phenoxyethanol, 0.3 parts sodium benzoate, 0.2 parts disodium ethylenediaminetetraacetate, 0.2 parts citric acid, 0.1 parts sodium citrate, 0.1 parts sodium thiosulfate; the total amount of sodium benzoate, sodium citrate, and sodium thiosulfate is 0.5 parts, and the ratio of the three is 3:1:1; Sensory agents (0.6 parts): 0.1 parts menthol, 0.5 parts flavoring; Functional agents (1.0 part): 0.4 parts pyridone ethanolamine salt, 0.2 parts selenium disulfide, 0.2 parts clomiphene, 0.2 parts salicylic acid; Matrix: Sodium cocoyl ethanesulfonate, make up to 100 parts.

[0039] A solid composition for scalp and hair care was prepared according to the above formula, and the preparation steps were completely consistent with those in Example 1, resulting in sample D5 of the solid composition for scalp and hair care.

[0040] Comparative Example 6: The difference from Example 1 is that the ethylene glycol distearate (a long-chain polyol ester) in the molding agent was replaced with an equal mass of butyl stearate (a non-long-chain non-polyol ester). A solid composition for scalp and hair care, with the following components in the following amounts: Molding agent (30 parts): 10 parts 16 / 18 alcohol, 4 parts stearic acid, 16 parts butyl stearate; Cleaning agent (13 parts): 12 parts sodium methyl lauroyl taurate, 1 part cocamide methyl MEA; Conditioner (9.5 parts): 0.5 parts purified water, 3 parts glycerin, 2 parts propylene glycol, 0.5 parts castor oil, 0.5 parts isopropyl myristate, 1 part docosyltrimethylammonium chloride, 0.5 parts guar hydroxypropyltrimethylammonium chloride, 0.5 parts polyquaternium-10, 1 part polydimethylsiloxane; Stabilizer (2.3 parts): 1 part hydroxypropyl methylcellulose, 0.4 parts phenoxyethanol, 0.3 parts sodium benzoate, 0.2 parts disodium ethylenediaminetetraacetate, 0.2 parts citric acid, 0.1 parts sodium citrate, 0.1 parts sodium thiosulfate; the total amount of sodium benzoate, sodium citrate, and sodium thiosulfate is 0.5 parts, and the ratio of the three is 3:1:1; Sensory agents (0.6 parts): 0.1 parts menthol, 0.5 parts flavoring; Functional agents (1.0 part): 0.4 parts pyridone ethanolamine salt, 0.2 parts selenium disulfide, 0.2 parts clomiphene, 0.2 parts salicylic acid; Matrix: Sodium cocoyl ethanesulfonate, make up to 100 parts.

[0041] A solid composition for scalp and hair care was prepared according to the above formula, and the preparation steps were exactly the same as in Example 1, resulting in sample D6 of the solid composition for scalp and hair care.

[0042] Performance tests were conducted on the products of Examples 1-3 and Comparative Examples 1-6. Measurement indicators and methods: 1. Silicone oil dispersion uniformity: The uniformity was tested using a laser particle size analyzer (model: Malvern Mastersizer 3000) according to GB / T 19077.1-2008 "Particle size analysis by laser diffraction". 0.5g of each sample was diluted with deionized water to a concentration of 1% (simulating a shampooing environment), ultrasonically dispersed for 5 minutes, and the particle size and coefficient of variation (CV value) were measured using a Malvern Mastersizer 3000 laser particle size analyzer. The smaller the CV value, the more uniform the silicone oil emulsion dispersion. 2. Silicon oil adsorption in hair: The adsorption was determined by inductively coupled plasma atomic emission spectrometry. A standard hair bundle (10 cm in length, 2 g in weight, and pretreated by degreasing and drying) was taken and immersed in the sample dilution solution (1% concentration, deionized water) for 5 min. After rinsing and drying the hair, the silicon content on the hair surface was measured. 3. Hair smoothness: The comb pull tester (model: YuanMore YM-01) was used for testing. A standard hair bundle (10cm in length, 2g in weight, hair bundle that has been degreased and dried) was taken and soaked in the sample dilution solution (1% concentration, deionized water) and shaken for 5 minutes. After rinsing and drying the hair, the maximum pull force required to comb the dry hair was tested. The smaller the pull force value, the better the smoothness. 4. Flocculation effect: Each sample was diluted to a concentration of 0.5% (simulating the concentration in the later stage of rinsing), and the particle size of the flocs (cationic polysaccharide-anionic surfactant complex) was tested using a laser particle size analyzer. 10~50μm is considered effective flocculation (which also indirectly reflects sufficient swelling of the cationic polysaccharide; no obvious flocculation peak indicates insufficient swelling and inability to form the complex). 5. Soap storage stability: The surface hardness of the sample was tested with a hardness tester. The higher the hardness value, the better the moldability. Each sample (30g) was stored in an environment of 25℃ and 75% relative humidity for 30 days. The surface was observed to see if it became sticky and the weight loss rate was tested (Formula (1)). The lower the weight loss rate, the better the water resistance.

[0043] (1) In formula (1): m0 is the initial mass of the sample; m1 is the mass of the sample after being stored in an environment of 25℃ and 75% relative humidity for 30 days.

[0044] The test results are shown in Table 3: Table 3 Test results of samples from Examples 1-3 and Comparative Examples 1-6 Example 1 30 8.2 128.5 0.80 28.9 none 63 8.0 Example 2 45 8.5 122.3 0.93 27.2 none 61 8.2 Example 3 20 7.0 98.6 1.05 26.6 none 64 7.9 Comparative Example 1 55 12.8 89.2 1.23 27.3 none 61 8.5 Comparative Example 2 10 6.2 68.9 1.47 26.7 none 60 8.3 Comparative Example 3 (0.6 parts salt) 30 8.3 127.3 0.81 30.2 Slightly sticky 44 15.3 Comparative Example 4 (without weak acid, strong base, or salt) 30 8.1 126.1 1.42 No obvious flocculation peak none 54 9.5 Comparative Example 5 (long-chain esters without polyols) 30 8.1 125.5 1.50 No obvious flocculation peak Slightly sticky 51 12.0 Comparative Example 6 (Stearate Substitution) 30 8.3 126.2 1.48 No obvious flocculation peak Slightly sticky 52 11.4 Results analysis: As shown in Table 3, Examples 1 (silicone oil emulsion particle size 30 μm), 2 (silicone oil emulsion particle size 45 μm), and 3 (silicone oil emulsion particle size 20 μm) exhibited excellent dispersion uniformity (CV value ≤ 8.5%), silicon adsorption capacity (≥ 98.5 μg / g), and smoothness (comb pull force ≤ 1.05 N). Furthermore, they did not exhibit surface stickiness after storage and remained stable in the molded state. Among them, the sample of Example 1 showed the best performance.

[0045] In addition, Examples 1-3, due to the addition of 0.5 parts of a weak acid-strong base salt (3:1:1 ratio) and ethylene glycol distearate, all formed effective flocs of 10-50 μm (particle size 26.6-28.9 μm), indirectly demonstrating that the cationic polysaccharide achieved rapid and sufficient swelling. Combined with the dispersion effect of silicone oil, the smoothness was excellent (comb pull force ≤1.05N). Comparative Example 4 (without weak acid-strong base salt) showed no obvious flocculation peak, proving that the cationic polysaccharide could not swell sufficiently and could not form a cationic-anionic complex. The comb pull force reached 1.42N, resulting in poor hair care effect. Comparative Example 5 (without ethylene glycol distearate) and Comparative Example 6 (butyl stearate instead of ethylene glycol distearate) lacked polyol long carbon chain esters, which could not reduce the surfactant solubilizing ability. They also showed no effective flocculation peak, and the soap hardness was much lower than that of Examples 1-3. The weight loss rate was significantly increased, and the water resistance deteriorated. Comparative Example 3 (total salt dosage 0.6 parts, exceeding the upper limit) formed effective flocs, but the excessive salt caused the soap to absorb moisture and soften, resulting in a sticky surface. Its hardness was only 44D, and the weight loss rate was 15.3%. These results indicate that the polydimethylsiloxane pre-emulsification in this scheme, forming a 20-45 μm emulsion, achieves uniform dispersion through the system's own surfactant (matrix), avoiding agglomeration or loss, significantly improving the silicone adsorption and smoothness of the hair, and solving the problem of uneven dispersion of oily components in low-water solid systems. Simultaneously, by limiting the amount of salt and combining it with a specific molding agent, the inherent contradiction of low-water, high-surface-activity solid systems is overcome, achieving the technical effect of allowing cationic polysaccharides to fully swell and form effective flocculation without pre-swelling, while also ensuring molding stability.

[0046] 6. Oil control and dandruff removal effect test The solid composition for scalp and hair care prepared in Example 1 was used as the test product, and a commercially available brand of shampoo bar was purchased as the control product. Test method: Volunteers aged 18-40, regardless of gender, were randomly invited and randomly divided into two groups of 6 men and 6 women, for a total of 12 people. The test product and control product were used to clean the scalp respectively. During the test, bleaching and dyeing of hair and the use of other hair care products were prohibited. The evaluation criteria for the anti-dandruff effects of the test product and the control product are as follows: Relief: Dandruff is significantly reduced, and scalp itching is relieved.

[0047] Significant improvement: Reduced dandruff, longer intervals between scalp itching episodes and reduced severity.

[0048] Ineffective: No improvement was observed in dandruff and scalp itching.

[0049] The results of the dandruff removal experiment are shown in Table 4.

[0050] Table 4. Product dandruff removal effect

[0051] As shown in Table 4, the solid composition for scalp and hair care prepared in this invention has excellent dandruff-removing effects. This invention, by combining specific components and proportions of active ingredients, ensures the product's excellent effects in inhibiting Malassezia and removing dandruff.

[0052] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A solid composition for scalp and hair care, characterized in that, It is made from the following ingredients in parts by weight: 30 parts molding agent, 13 parts cleaning agent, 9.5 parts conditioning agent, 2.3 parts stabilizer, 0.6 parts sensory agent, 1.0 part functional agent, and base to make up to 100 parts; The conditioner comprises the following components: 0.5 parts pure water, 3 parts glycerin, 2 parts propylene glycol, 0.5 parts castor oil, 0.5 parts isopropyl myristate, 1 part docosyltrimethylammonium chloride, 0.5 parts guar hydroxypropyltrimethylammonium chloride, 0.5 parts polyquaternium-10 and 1 part polydimethylsiloxane; The functional agent comprises the following components: 0.4 parts pyridone ethanolamine salt, 0.2 parts selenium disulfide, 0.2 parts clomiphene, 0.2 parts salicylic acid; The polydimethylsiloxane is dispersed in the solid composition for scalp and hair care in the form of emulsion microparticles with an average particle size of 20-45 μm; The stabilizer comprises the following components: 1 part hydroxypropyl methylcellulose, 0.4 parts phenoxyethanol, 0.3 parts sodium benzoate, 0.2 parts disodium ethylenediaminetetraacetate, 0.2 parts citric acid, 0.1 parts sodium citrate, and 0.1 parts sodium thiosulfate; The molding agent comprises 10 parts of 16 / 18 alcohol, 4 parts of stearic acid and 16 parts of ethylene glycol distearate; The cleaning agent comprises 12 parts sodium methyl lauroyl taurate and 1 part cocamide methyl MEA; The sensory agent comprises 0.1 parts menthol and 0.5 parts flavoring; The matrix is ​​sodium cocoyl hydroxyethanesulfonate.

2. The method for preparing the solid composition for scalp and hair care according to claim 1, characterized in that, Includes the following steps: (1) The solid components of the molding agent, cleaning agent, stabilizer, sensory agent, functional agent and conditioning agent are crushed separately, passed through an 80-100 mesh sieve, and placed in a three-dimensional motion mixer. They are mixed for 15-25 minutes at a speed of 300-500 r / min to obtain a uniform solid powder. (2) Take the polydimethylsiloxane in the conditioner, add the pure water and the matrix in the conditioner, and then emulsify it to prepare a silicone oil emulsion with a particle size of 20~45μm. After emulsification, cool it to room temperature for later use. (3) The cooled silicone oil emulsion from step (2) is mixed with the molding agent, the cleaning agent, the stabilizer, the sensory agent, the functional agent and the remaining liquid components of the conditioning agent, and stirred until the system is free of stratification and particles to obtain a liquid conditioning mixture; (4) Slowly add the liquid conditioning mixture obtained in step (3) to the solid powder in step (1) while adding it dropwise and stirring at a speed of 400-600 r / min. After the addition is completed, continue mixing for 10-15 min until the system is a uniform loose powder without lumps or sticking to the wall, and obtain loose powder. (5) The loose powder is placed in a stamping mold and pressed into shape under a pressure of 5-8 MPa and a holding time of 3-5 s. After demolding, it is placed in an environment with a temperature of 25-30℃ and a relative humidity of 40%-60% and left to dry for 24-48 hours to obtain the solid composition for scalp and hair care.

3. According to the preparation method of claim 2, in step (2), the specific conditions for emulsification are: emulsification for 20-40 min at a temperature of 45-55℃ and a rotation speed of 800-1200 r / min.

4. The use of the solid composition for scalp and hair care according to claim 1 or the solid composition for scalp and hair care prepared by any one of claims 2-3 in the preparation of scalp and hair care products.

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