Silicone-oil-free bidirectional target softening agent based on shampoo and preparation method

Abstract

The invention relates to the technical field of cosmetic chemistry, in particular to a silicone-oil-free bidirectional target softening agent based on shampoo and a preparation method of the silicone-oil-free bidirectional target softening agent. 1-6% of panthenol; 1 to 5% of olive oil PEG-7 esters; 2-6% of glycerin; 1 to 3% of guar gum hydroxypropyl trimethyl ammonium chloride; 1.4 to 1.6 percent of 1, 2-pentanediol; 0.8% to 2% of polyquaternium-67; 0.6 to 1.3 percent of citric acid; 0.4 to 0.6 percent of ethylhexylglycerin; 0.3 to 1% of PPG-10 methyl glucose ether; 0.065% to 0.08% of hydrolyzed keratin; 0.008% to 0.012% of butanediol; and 0.0028 to 0.0036 percent of phenoxyethanol. According to the silicone-oil-free bidirectional target softening agent based on the shampoo and the preparation method, the proportion of the cationic polymer to the natural grease is dynamically adjusted according to parameters such as the hair quality damage degree, the scalp pH value and the charge density, personalized repair is achieved, excessive adsorption or insufficient cleaning power is avoided, and the silicone-oil-free bidirectional target softening agent based on the shampoo is obtained by adopting a microcapsule wrapping technology and combining environment humidity and temperature changes. The release rate of moisturizing factors (such as glycerol and panthenol) is controlled, and the lasting moisturizing capacity of hair in a dry environment is improved.

Description

Technical Field

[0001] This application relates to the field of cosmetic chemistry technology, and in particular to a silicone-free bidirectional target softener for shampoo and its preparation method. Background Technology

[0002] Shampoo (also known as hairspray or hair lotion) is the most commonly used hair cosmetic. Its main function is to clean the scalp and hair, remove oil, sweat, dead skin cells and external dirt, and lay the foundation for hair styling.

[0003] While existing silicone-free shampoos have avoided the problem of silicone residue, they still have the following drawbacks in actual use:

[0004] 1. Traditional silicone-free formulas, while having strong cleaning power, can easily lead to dry and frizzy hair, lacking the smoothness of silicone-based ingredients.

[0005] Second, excessive use of cationic conditioners can easily accumulate positive charges on the hair surface, causing static electricity, stickiness, and even affecting scalp health.

[0006] 3. In dry or low-humidity environments, moisturizing ingredients are not released precisely, causing hair to easily lose moisture and the smoothing effect to not last.

[0007] 4. The pH of the scalp microenvironment fluctuates greatly, and ordinary buffering systems have difficulty responding dynamically, leading to abnormal opening and closing of hair cuticles and affecting hair quality.

[0008] 5. Softening agents are easily interfered with by surfactants during the washing process, making it difficult for them to be effectively absorbed into the hair shaft and affecting the repair effect. Summary of the Invention

[0009] To address the problems mentioned in the background art, this application provides a silicone-free bidirectional target softener for shampoo and its preparation method.

[0010] This application provides a silicone-free, two-way target softener for shampoo, employing the following technical solution:

[0011] Includes the following components by weight percentage:

[0012] Water: 75-85%;

[0013] Panthenol: 1-6%;

[0014] Olive oil PEG-7 esters: 1-5%;

[0015] Glycerin: 2-6%;

[0016] Guar gum hydroxypropyltrimethylammonium chloride: 1-3%;

[0017] 1,2-Pentanediol: 1.4-1.6%;

[0018] Polyquaternium-67: 0.8-2%;

[0019] Citric acid: 0.6-1.3%;

[0020] Ethylhexylglycerin: 0.4-0.6%;

[0021] PPG-10 methyl glucosyl ether: 0.3-1%;

[0022] Hydrolyzed keratin: 0.065-0.08%;

[0023] Butylene glycol: 0.008-0.012%;

[0024] Phenoxyethanol: 0.0028-0.0036%.

[0025] Another technical problem to be solved by the present invention is to provide a method for preparing a silicone-free bidirectional target softener for shampoo, comprising the following steps:

[0026] Preferably, the step of adjusting the ratio of cationic polymer to natural oils based on different degrees of hair damage further includes:

[0027] The relative content of cationic polymers and natural oils is determined based on the degree of hair damage.

[0028] The concentration of citrate is dynamically adjusted based on changes in scalp pH to maintain the overall pH between 5 and 6.5.

[0029] When hair is severely damaged, increase the amount of olive oil PEG-7 esters and glycerin used to enhance moisturizing and repairing effects;

[0030] If the surface charge density of hair Greater than the set threshold This reduces the proportion of guar gum hydroxypropyltrimethylammonium chloride and increases the amount of hydrolyzed keratin used. Indicates the surface charge density of hair. This indicates a pre-set upper limit for the threshold used to limit the risk of positive charge accumulation.

[0031] Preferably, the step of adjusting the ratio of cationic polymer to natural oils based on different degrees of hair damage further includes:

[0032] Based on the damage and frizz index The content of cationic polymers is dynamically adjusted;

[0033] Based on scalp oil secretion Assess skin cleansing needs;

[0034] If the ambient humidity Less than the critical value For example, moisturizing factors are added in the form of microcapsules to control the release rate;

[0035] If the hair damage coefficient And scalp pH value Therefore, reducing the proportion of panthenol and increasing the proportion of hydrolyzed keratin, among which, Indicates the degree of hair damage. It is a coefficient benchmark for judging high-damage hair quality. Indicates the pH value of the scalp. It is the lower limit of the suitable pH control range.

[0036] Preferably, the step of regulating the release rate of microcapsule-encapsulated moisturizing factors based on changes in environmental humidity further includes:

[0037] Measure the water vapor pressure in the current environment ;

[0038] analyze The relationship between moisture and hair surface humidity helps determine whether enhanced moisturizing is needed.

[0039] The microcapsule opening is triggered by an intelligent temperature control mechanism.

[0040] If the relative humidity of the air And surface evaporation rate Initiate the slow-release procedure, in which Indicates relative humidity of the air. As the trigger point, This represents the rate of water evaporation per unit area of ​​the hair surface. This is the evaporation sensitivity threshold.

[0041] Preferably, the step of adjusting the citrate concentration of the buffer system based on the scalp pH further includes:

[0042] Real-time monitoring of the frequency of pH changes on the scalp surface;

[0043] If pH fluctuation frequency Exceeding the preset limit value Then the double buffering system is activated;

[0044] When the pH shows a significant downward trend, the dosage of buffering components should be reduced appropriately;

[0045] If the scalp pH level And pKa value To maintain stability, the citrate ratio is increased. This indicates the current pH level of the scalp. It is the lowest value within the suitable range. The pKa value of the selected buffer system. This indicates the optimal balance point.

[0046] Preferably, the step of regulating the migration behavior of amphiphilic softening agents based on the surfactant concentration gradient during the washing process further includes:

[0047] Detect changes in foam layer thickness during the washing process;

[0048] Once the foam thickness reaches its peak, gradually reduce the washing power.

[0049] Dynamically adjust the migration path of softening additives to prevent aggregation;

[0050] If the foam volume Greater than the critical value And the viscosity of the aqueous solution greater than critical viscosity This limits the rate at which the softener is added, among which, Indicates the volume of the foam. It is the upper limit of the safe range. Indicates the viscosity of the solution. It is the lower limit of the optimal flow range.

[0051] Preferably, the intelligent responsive regulation step based on the difference in surface charge density of hair to control the amount of cation adsorption further includes:

[0052] Analyze the charge distribution patterns in different regions;

[0053] Select a suitable cationic polymer based on the difference in local charge density;

[0054] Introduce a natural amino acid complex with neutralizing effect into the high-frequency positive charge region;

[0055] If the local positive charge density Greater than the threshold And the time span If the duration exceeds the specified period, a reverse charge shielding strategy is adopted, wherein... Represents the local positive charge density. This indicates the maximum permissible positive charge concentration threshold. It is the continuous observation time.

[0056] Preferably, the step of regulating the release rate of the microcapsule-encapsulated moisturizing factor based on ambient humidity further includes:

[0057] Continuous monitoring of air moisture content;

[0058] If humidity is below the comfort threshold Then, the microcapsules are ruptured and water-retaining factors are released through photocatalysis.

[0059] The water retention effect is improved by utilizing hygroscopic resins.

[0060] If humidity And temperature This prolongs the sustained-release time, among which, Indicates actual air humidity. It is the critical drying value. Indicates the current temperature. It is the ideal drying point temperature.

[0061] Preferably, the regulation step based on the effect of surfactant concentration gradient on the migration behavior of amphiphilic softener further includes:

[0062] Set the cleaning force intensity for the initial stage;

[0063] Gradually reduce the cleaning power until the gentle phase begins;

[0064] The aggregation of softener is inhibited by electrostatic repulsion.

[0065] If the detergent concentration And contact time In this case, a softening agent is introduced in advance for buffering and adjustment. Indicates surfactant concentration. This is the upper limit of the safe concentration. It's the contact time. This is the maximum tolerance time;

[0066] The regulation steps based on the difference in surface charge density of hair to regulate the response of cationic polymers further include:

[0067] Distinguish the direction of charge on the surface of hair cuticles;

[0068] Using magnetic nanoparticles to identify the charge status of different regions;

[0069] Apply a reversible neutralization layer at areas of high positive charge concentration;

[0070] If the charge distribution is not uniform And the duration is Then the dynamic response mechanism is activated, where, Indicates the degree of local charge unevenness. It is the maximum value within the acceptable range. It refers to the duration. That is the longest allowed time.

[0071] Preferably, the step of intelligently adjusting the ratio of cationic polymers and natural oils based on the degree of hair damage further includes:

[0072] Record the shine and elasticity of your hair after each use;

[0073] Comprehensive calculation of damage index , (Gloss, loss of elasticity);

[0074] based on The value is automatically updated to reflect the ratio of cationic polymer to oil.

[0075] If the damage index And the number of days It will automatically increase the amount of moisturizing factor used, among which, It is the threshold for determining high loss. It is the number of days of observation. This is the recommended adjustment cycle.

[0076] In summary, this application includes at least one of the following beneficial technical effects:

[0077] 1. This product is based on a silicone-free, two-way targeted softener for shampoos and its preparation method. It dynamically adjusts the ratio of cationic polymers to natural oils according to parameters such as the degree of hair damage, scalp pH, and charge density to achieve personalized repair and avoid excessive adsorption or insufficient cleansing power.

[0078] 2. This product is based on a silicone-free, two-way targeted softener for shampoo and its preparation method. It uses microencapsulation technology and combines environmental humidity and temperature changes to control the release rate of moisturizing factors (such as glycerin and panthenol), thereby improving the hair's ability to maintain moisture in dry environments.

[0079] 3. This shampoo-based silicone-free dual-target softener and its preparation method, through the compounding of citrate and citric acid, adjusts the pH of the system in real time between 5 and 6.5, maintains a slightly acidic environment for the scalp, reduces hair cuticle damage, and improves hair shine and smoothness.

[0080] 4. This invention relates to a silicone-free, two-way targeted softener for shampoos and its preparation method. It utilizes amphiphilic components such as PPG-10 methyl glucoether to directionally migrate to damaged areas of the hair during the washing process according to the surfactant concentration gradient, thereby improving the effective adsorption and action efficiency of the softener.

[0081] 5. Based on the silicone-free dual-target softener and its preparation method, this product introduces ingredients such as polyquaternium-67 and hydrolyzed keratin. It performs reversible charge neutralization according to the surface charge density of hair, preventing static electricity accumulation and reducing frizz and dirt adsorption. Attached Figure Description

[0082] Figure 1 This is a flowchart of the preparation method of a silicone-free bidirectional target softener for shampoo. Detailed Implementation

[0083] The embodiments of this application are described in detail below, and examples of the embodiments are shown in the accompanying drawings.

[0084] In the description of this specification, the references to "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" refer to specific features, structures, materials, or characteristics described in connection with the described embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions 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 one or more embodiments or examples.

[0085] Reference Appendix Figure 1 This invention describes a silicone-free, two-way targeted softener for shampoo and its preparation method, comprising: firstly, weighing each raw material according to a specified ratio, wherein water, as the base solvent, constitutes the majority and is used for subsequent dilution and uniform dispersion of the system; panthenol, as a moisturizing and antioxidant agent, at a concentration of approximately 3%, enhances the scalp barrier function without causing excessive deposition on the hair cuticle; olive oil PEG-7 esters, at a 3% ratio, interact with natural oils to form a lightweight, soft film, avoiding the residue caused by excessive fatty acids; glycerin and butylene glycol, present at concentrations of 2% and 0.1% respectively, effectively maintain hair moisture content and improve smoothness; guar gum hydroxypropyltrimethylammonium chloride and polyquaternium-67, at proportions of 2% and 2% respectively, these cationic polymers achieve the desired effect on the scalp through electrostatic adsorption. The product provides directional protection to the hair surface and, due to its specific molecular structure, reduces direct conflict with cleansing ingredients, improving product stability and synergistic effects. 1,2-Pentanediol and ethylhexylglycerin, at 1.4% and 0.5% respectively, are used as moisturizers and preservatives, enhancing product comfort while ensuring safety. PPG-10 methyl glucoether, present at a concentration of 6% in the formula, has a unique amphiphilic structure that guides softening agents to migrate to damaged areas for sustained release. Citric acid adjusts the overall pH, and when controlled at 1%, it meets the needs of the scalp's microecology and stabilizes other ingredients to prevent them from becoming ineffective due to environmental changes. Hydrolyzed keratin and phenoxyethanol are present as auxiliary ingredients; the former replenishes amino acids to promote nourishment, while the latter is used to maintain the product's long-term stability.

[0086] All weighed raw materials are added to the mixing tank in a specific order. First, an appropriate amount of water is poured into the reaction vessel and stirring is started. Then, viscous substances or substances requiring pre-dispersion, such as glycerin, guar gum hydroxypropyltrimethylammonium chloride, and polyquaternium-67, are added in sequence. High shear force is used to ensure complete dissolution and thorough mixing with other ingredients. During this process, a continuous circulation method is used to make the components more uniformly integrated. Next, active ingredients such as panthenol, citric acid, 1,2-pentanediol, ethylhexylglycerin, and PPG-10 methyl glucoether are added gradually while maintaining a certain temperature and stirring speed to ensure the thermal stability and consistent physicochemical properties of the formula. Finally, olive oil PEG-7 esters and hydrolyzed keratin are added, and the mixture is further solidified by low-temperature cooling to form a stable system.

[0087] For example, in specific embodiments, personalized formulations are made according to different customer skin types: for patients with sensitive or seborrheic scalps, the proportion of cationic polymers such as polyquaternium-67 is appropriately reduced to 1%, while olive oil PEG-7 esters are increased to 4% to provide more natural oil replenishment; for people who frequently use their hair in dry climates, more PPG-10 methyl glucoether and trace amounts of sodium citrate can be incorporated into the formulation to enhance the long-lasting moisturizing effect; when it is found that the pH value of a user's hair follicle area is alkaline, the amount of citrate in the buffer can be adjusted. For example, increasing the concentration by 0.2% can restore a healthy, slightly acidic environment. For people who sweat a lot or wash their hair frequently, a formula with a lower surfactant content can be considered, allowing the conditioner to adhere better to the hair shaft rather than being easily washed off. In addition, microencapsulation technology is particularly emphasized in products sold in cold winter regions, which can prolong the moisturizing effect and prevent the rapid evaporation of moisture in dry air. In short, by precisely controlling the amount of each component and its interaction, the above five key challenges have been solved, and a long-lasting and gentle smoothing effect has finally been achieved in silicone-free shampoos.

[0088] The present invention describes the steps for adjusting the ratio of cationic polymers to natural oils based on different degrees of hair damage: the relative contents of cationic polymers and natural oils are determined based on the degree of hair damage; the proportions of ingredients such as guar hydroxypropyltrimethylammonium chloride and olive oil PEG-7 esters are adjusted according to the degree of hair damage to match the hair's absorption capacity and repair needs. For example, in one embodiment, for severely damaged hair, guar hydroxypropyltrimethylammonium chloride is reduced to below 2% and olive oil PEG-7 esters are increased to 4%, thereby improving the hair care effect.

[0089] The concentration of citrate is dynamically adjusted based on changes in scalp pH to maintain the overall pH between 5 and 6.5, ensuring that the product is gentle on the human body and effectively maintains hair structure. Specifically, if the pH is detected to rise above 6.5, the concentration of citric acid is increased to 1.3% to restore a suitable acid-base environment.

[0090] When hair is severely damaged, increase the amount of olive oil PEG-7 esters and glycerin to enhance moisturizing and repairing effects. Increasing the proportion of these ingredients can enhance the ability of hair cuticles to close and retain moisture. Specifically, if the damaged hair is dry and split, the amount of olive oil PEG-7 esters can be increased from 2% to 5%, and glycerin can be increased to 4% to achieve better repair results.

[0091] If the hair surface charge density value E is greater than the set threshold R, the proportion of guar hydroxypropyltrimethylammonium chloride is reduced and the amount of hydrolyzed keratin is increased. Here, E represents the positive charge density of the hair surface, and R represents the set upper limit of positive charge, which is used to control static electricity problems caused by excessive charge. The formula is E>R, and the setting range is 0.5-1.0 C / m², with the optimal value set at 0.75 C / m² to balance charge and protection. For example, in one embodiment, when E is measured to be 0.8 C / m², which exceeds R of 0.75 C / m², the guar hydroxypropyltrimethylammonium chloride needs to be reduced to 2%, and hydrolyzed keratin needs to be added to 0.07% to reduce the cumulative risk and promote nutrient penetration.

[0092] The present invention describes the steps for adjusting the ratio of cationic polymers to natural oils based on different degrees of hair damage: The content of cationic polymers is dynamically adjusted based on the damage and frizz index I, where I represents the degree of hair damage and frizz, and the value range is usually between 0.1 and 2.0. When I is high, it indicates that the hair is more frizzy, and the content of cationic polymers needs to be increased to enhance softness and close the hair cuticles. For example, in one embodiment, if the value of I is 1.5, the amount of polyquaternium-67 can be adjusted from 1.0% to 1.4%, thereby improving the repair effect.

[0093] The skin cleansing needs are assessed based on the amount of sebum secreted by the scalp (H). H represents the amount of sebum secreted by the scalp, and its value is usually between 0.5 and 3.0. The higher the value, the more abundant the sebum, and the higher the cleansing power required. For example, in one embodiment, when the H value reaches 2.8, it is recommended to reduce the proportion of ethylhexylglycerin and increase the proportion of water to improve rinsing and reduce residue.

[0094] If the ambient humidity M is less than the critical value T, moisturizing factors are added in the form of microcapsules to control the release rate. M represents the relative humidity of the environment, and T is usually set above 50%. When M is less than T, the air is dry and the hair is prone to dryness. Therefore, microcapsule technology is used to delay the release of moisturizing factors and improve long-lasting moisturization. For example, in one embodiment, when the M value is 45%, glycerin and olive oil esters encapsulated in microcapsules are selected to be slowly released during the washing process to demonstrate a continuous moisturizing effect.

[0095] If the hair damage coefficient S≥X and the scalp pH value D>Y, then reduce the proportion of panthenol and increase the proportion of hydrolyzed keratin. S refers to the degree of hair damage, and X can be set to 1.2. When S≥1.2, it indicates that the hair is severely damaged. D is the scalp pH value, and Y can be set to 5.5, indicating that a value below this may cause irritation. For example, in one embodiment, if S=1.3 and D=6.0, then the proportion of panthenol should be reduced from 4% to 3%, and the proportion of hydrolyzed keratin should be increased to 0.08% to improve fragility and restore hair strength.

[0096] The present invention describes the steps for regulating the release rate of microcapsule-encapsulated moisturizing factors based on changes in environmental humidity: measuring the water vapor pressure P in the current environment. This parameter reflects the water vapor content in the air, and its unit is Pascal (Pa). The range is usually 500-3000 Pa. In practical applications, the optimal value of P is set to 1500 Pa to accurately characterize the humidity under different environmental conditions, which is convenient for subsequent judgment on whether the hair condition needs enhanced moisturizing.

[0097] The system analyzes the relationship between P and hair surface humidity. By comparing the current ambient humidity with the actual humidity of the hair surface, it determines whether it is necessary to release moisturizing factors. For example, in a dry environment, if the hair surface humidity is found to be lower than the target range, the system will proceed to the next step.

[0098] The microcapsules are triggered to open using an intelligent temperature control mechanism. When changes in ambient temperature or humidity are detected, the internal heating or cooling device is activated to control the pore size of the microcapsule membrane, thereby regulating the permeability of the moisturizing factors and achieving precise release.

[0099] If the relative humidity R ≤ L and the surface evaporation rate V ≥ M, the slow-release procedure is initiated, where R represents the relative humidity, L is the trigger point (default 40%), V represents the rate of water evaporation per unit area of ​​the hair surface (g / (m²·s)), and M is the evaporation sensitivity threshold (default 0.02 g / (m²·s). For example, in one embodiment, when R drops to 35% and V reaches 0.025 g / (m²·s), indicating that the scalp and hair have lost a significant amount of moisture, the system will automatically open the microcapsules and slowly release moisturizing ingredients, such as panthenol and glycerin, to maintain scalp health and hair smoothness.

[0100] Describe the step of adjusting the citrate concentration of the buffer system based on the scalp pH value in the present invention: Detect the change frequency of the scalp surface pH value in real time by collecting the scalp pH value through a built-in sensor and recording its fluctuation situation to analyze the stability of the skin microenvironment. For example, when using the shampoo of the present invention, the pH value detection device can continuously monitor the change of the user's scalp pH value and calculate its fluctuation frequency. Here, F represents the number of pH changes per unit time, and Q represents the threshold of normal fluctuation, usually set within 5 times / minute. If the actually measured F exceeds Q, it indicates that there may be a drastic change in the pH value that may affect hair follicle health.

[0101] If the pH fluctuation frequency F exceeds the preset limit value Q, activate the double buffer system, which starts an additional buffer component when the pH fluctuation exceeds the set range to prevent the scalp from being damaged by sudden pH changes. For example, when the user uses a traditional silicone-containing shampoo and the cleaning power is too strong, resulting in a rapid decrease in pH, activating the double buffer system at this time can effectively maintain the balance of the microecological environment. The operation logic of the double buffer system determines whether to intervene based on the relationship between F and Q.

[0102] Appropriately reduce the dosage of the buffer component when the pH shows a significant downward trend. This measure aims to avoid other side effects caused by excessive regulation, such as too high pH affecting the cleaning efficiency or irritating the skin. For example, when it is detected that the scalp pH shows a continuous decreasing trend but the double buffer system has not been triggered, moderately reduce the proportion of the buffer component to maintain an appropriate neutralization ability.

[0103] If the scalp pH value Z B, increase the citrate proportion to maintain stability. Here, Z is the current scalp pH value, A is the lowest value of the appropriate range, generally set at 4.5 - 5.5, P is the pKa value of the selected buffer system, and B is the best balance point, set around 5.0. The purpose of setting this formula is to enable the buffer system to return to the appropriate state when it is lower than the normal value, and at the same time avoid dryness caused by excessive citrate. For example, when the user's scalp pH is lower than 5.0 and the pKa of the buffer is relatively high, appropriately increasing the proportion of citrate can enhance the pH regulation ability and ensure the effectiveness and comfort of the product.

[0104] Describe the step of regulating the migration behavior of the amphiphilic softening agent based on the surfactant concentration gradient during the washing process in the present invention: Detect the change of the foam layer thickness during the washing process, aiming to monitor the dynamic behavior of the surfactant during the washing stage to judge whether the best washing effect is achieved and trigger subsequent regulation measures. For example, when using a silicone-free shampoo containing polyquaternium-67 and guar hydroxypropyltrimonium chloride, by observing the change of the foam thickness, the interaction between the surfactant and the softening agent can be grasped.

[0105] After the foam thickness reaches its peak, the washing power is gradually reduced. This step is designed to avoid hair damage caused by over-cleansing and to guide the softening agent to effectively penetrate into the hair cuticle. For example, during the high foam stage, by reducing the brushing force or adjusting the rinsing water flow speed, the amphiphilic softening agent can be smoothly adsorbed onto the hair surface in a lower turbulence environment.

[0106] Dynamically adjusting the migration path of softening agents to prevent aggregation aims to optimize the distribution of softening agents on the hair surface and avoid uneven coverage or clumping caused by excessively high local concentrations. For example, by adjusting the ratio of glycerin to olive oil PEG-7 esters, the dispersibility and migration rate of softening agents in water can be improved.

[0107] If the foam volume F is greater than the critical value G and the aqueous solution viscosity C is greater than the critical viscosity D, the rate of addition of the softener is limited. F is defined as the foam volume, and its critical value G is set to 100 mL, indicating that flow problems may occur when the foam volume exceeds this value. C is the aqueous solution viscosity, and its critical viscosity D is set to 1.2 mPa·s, representing the lower limit of the ideal flow range. For example, when the foam volume reaches 110 mL and the viscosity is 1.3 mPa·s, the rate of addition of the softener is slowed down to prevent it from being difficult to distribute evenly due to insufficient fluidity. This control logic ensures that the softening agent can fully function in the appropriate environment, while ensuring the stability and safety of the shampoo product.

[0108] The present invention describes the intelligent responsive control steps of cation adsorption based on differences in hair surface charge density: Analyzing charge distribution maps in different regions refers to using surface charge detection technology to determine the influence of different ingredient formulations in shampoo on the charge distribution of various parts of the hair surface, thereby obtaining accurate charge data. Selecting suitable cationic polymers based on local charge density differences means matching cationic materials that can efficiently interact with charges without over-adsorption, based on the positive and negative charge intensities shown in the map. For example, in a formulation containing guar gum hydroxypropyltrimethylammonium chloride, the selection of other cationic materials can be optimized based on the map results. Introducing natural amino acid complexes with neutralizing effects in high-frequency positive charge regions means adding substances like arginine or glycine when the positive charge density in a specific region is too high. A natural amino acid complex, such as an acid, is used to neutralize the charge and reduce irritation. If the local positive charge density N is greater than the threshold O and the time span T is longer than the specified period, a reverse charge shielding strategy is adopted, where N is the local positive charge density (range can be set to 10–50 charges / micrometer²), O is the maximum allowable positive charge concentration threshold (optimal value set to 30 charges / micrometer²), and T is the continuous observation time (range 1–5 minutes). This strategy aims to prevent excessive accumulation on the hair surface due to long-term positive charge accumulation, thereby avoiding the occurrence of frizz. For example, in one embodiment, when a certain area of ​​the hair has an excessively high positive charge density after shampooing and fails to balance naturally for a long time, the system automatically activates an antistatic agent, such as polyquaternium-67, to perform reverse charge shielding to restore the hair condition.

[0109] Describe the regulation steps of the release rate of the microcapsule-coated moisturizing factor based on environmental humidity: Continuously monitor the moisture content in the air, and obtain environmental humidity data in real time through sensors to ensure timely response to changes in moisture in the air and provide basic parameters for subsequent regulation. For example, when using shampoo containing microcapsules, when the air is dry, the monitoring system can detect a decrease in humidity and trigger the release mechanism. If the humidity is lower than the comfort threshold R, the microcapsules are induced to rupture by photocatalysis to release the water-retaining factor, where the range of R is 30% - 45%, and the most suitable value is 38%. When the air humidity is lower than this threshold, ultraviolet light or light of a specific wavelength activates the catalyst, damaging the microcapsule membrane structure, thereby releasing the water-retaining component and increasing the water content of the hair. For example, in a dry hair environment, when the humidity drops to 35%, photocatalysis unlocks the moisturizing factor to relieve the problem of dry hair. Use a hygroscopic resin to synergistically improve the water-retaining effect. This resin absorbs moisture in the air in a low-humidity environment and forms a stable water-retaining layer with the released moisturizing factor. The hygroscopic resin is usually selected as sodium polyacrylate or a similar highly hygroscopic material, which can effectively enhance the action time of the water-retaining factor. For example, after adding 1% of sodium polyacrylate to the formula, the retention rate of the water-retaining factor is increased by 20%. If the humidity W < S and the temperature U > V, the slow-release time is extended, where W represents the actual air humidity, S is the critical drying value, U represents the current temperature, and V is the ideal drying point temperature. Among them, the value range of S is 35% - 40%, the best is 37%, and V is recommended to be 20 - 25 °C, and the best value is 22 °C. When the air humidity is too low and the temperature is too high, it means that moisture in the environment is more likely to evaporate. Therefore, the release rhythm of the moisturizing factor is delayed to reduce loss. For example, in an environment of 25 °C and 32% relative humidity, the release speed is automatically delayed to avoid excessive water loss in a short time.

[0110] Describe the regulation steps of the migration behavior of amphiphilic softeners affected by the surfactant concentration gradient in the present invention: Set the cleaning power intensity at the initial stage to ensure the initial washing effect and avoid prematurely activating the softener. The parameter setting needs to be based on the formula characteristics of the shampoo and the skin condition of the target user. Excessive cleaning power intensity will damage the hair structure, so the initial cleaning power should be controlled at a medium level. For example, in the application of a two-way target softener without silicone oil, the surfactant concentration can be set below 3% in the initial stage to reduce direct irritation to the scalp and hair.

[0111] Gradually weaken the cleaning power until the gentle stage starts. This process adjusts the surfactant concentration step by step so that the softener can be released as needed during the shampooing process. In this stage, as the cleaning power decreases, the foam stability generated by the surfactant increases, which helps to bring the softener into the hair interior. For example, when shampooing, first use a pre-wash product containing a higher concentration of surfactant (such as cocamidopropyl betaine), and then transition to a main wash formula containing a low concentration of surfactant.

[0112] This step inhibits the aggregation of softeners by using electrostatic repulsion. It involves adding positively charged cationic surfactants or polymers to the shampoo to prevent negatively charged softener particles from adsorbing each other, thereby improving their migration ability. For example, adding guar hydroxypropyltrimethylammonium chloride to the formulation can form an electrostatic shielding effect, preventing the softener from agglomerating in the solution.

[0113] If the detergent concentration M≥N and the contact time P≥Q, a softener should be introduced in advance for buffering and adjustment. M is the actual concentration of the surfactant, N is its upper limit of safe concentration, P is the contact time on the hair surface, and Q is the maximum tolerable time. When M≥N and P≥Q, it is easy to damage the hair. For example, when using a detergent with a high concentration of surfactant (such as SLS, about 4%), if the contact time exceeds 3 minutes (i.e. P≥Q), a small amount of hydrolyzed keratin and other softening components should be introduced at the beginning of the rinsing stage to alleviate the damage of the surfactant to the hair surface.

[0114] The present invention describes the regulation steps of the cationic polymer response based on the difference in surface charge density of hair: distinguishing the direction of surface charge of hair cuticles refers to measuring the direction and distribution of surface charge of hair through specific means, thereby determining whether the hair cuticles are in an expanded or closed state. For example, in a shampoo-based silicone-free bidirectional target softener and its preparation method, electrochemical sensing technology is used to detect the change in charge density on the hair sample, thereby evaluating the state of the hair cuticles.

[0115] The identification of the charge status of different regions using magnetic nanoparticles is achieved by introducing materials containing magnetic particles into the system. This allows the magnetic nanoparticles to react with the surface charge of the hair cuticle and adsorb at the corresponding locations, thereby distinguishing different charge distributions. For example, in this invention, positively charged magnetic nanoparticles are used as probes and are uniformly dispersed in shampoo. When they come into contact with negatively charged areas, they are specifically adsorbed, helping to achieve visual detection of charge status.

[0116] Applying a reversible neutralizing layer to areas of high positive charge concentration means designing ingredients with specific neutralizing capabilities for areas of high charge density, such as certain polymers with counter-charges, to reduce localized electrostatic repulsion and improve hair feel. For example, in this invention, adding an appropriate amount of polyquaternium-67 in combination with a cationic polymer can provide a reversible neutralizing effect in areas of high positive charge, thereby improving smoothness.

[0117] If the charge distribution unevenness value D>E and the duration is T>F, then the dynamic response mechanism is activated. The formula D>E indicates that the unevenness of the local charge distribution exceeds the expected allowable range, where E is the preset maximum acceptable range; T>F indicates that the duration of the uneven state exceeds the allowable threshold. For example, in this invention, E=0.8mV (millivolts) and F=5 minutes are set. If a part of the hair continuously shows charge imbalance exceeding this threshold during the shampooing process, the dynamic response mechanism is activated to automatically adjust the active ingredients in the formula to achieve the purpose of stabilizing charge balance.

[0118] The present invention describes the intelligent adjustment steps for the ratio of cationic polymers and natural oils based on the degree of hair damage: The system records the shine and elasticity of the hair after each use, acquires data through instruments or sensory evaluation, and analyzes hair health. For example, users can use a smart comb or smartphone camera to capture the reflective and tactile information of the hair surface. The system converts this information into digital indicators and comprehensively calculates the damage index K, K = f(shiny, elasticity loss), where shine is a value measuring the smoothness of the hair surface, typically ranging from 0.1 to 1.0, and elasticity loss is the percentage decrease in the hair's breaking toughness, with an optimal value less than 10%. The function f can be designed as a linear superposition, with weights adjusted according to the actual application scenario, such as f(x,y) = 0.6x + 0.4y, to reflect different dimensions. The system automatically updates the ratio of cationic polymers to oils based on the K-value, which affects hair quality. A higher K-value indicates more severe damage, requiring an increase in the content of cationic polymers such as polyquaternium-67, along with an appropriate increase in natural oils such as olive oil PEG-7 esters to achieve a repair effect. If the damage index K ≥ L and the duration M ≥ N, the system automatically increases the amount of moisturizing factor. L is the damage threshold exceeding the set standard, such as K ≥ 0.7. M is the observation time, usually set to 3 days, and N is the recommended adjustment cycle, such as once a week. For example, if the user's hair shine and elasticity decrease after using the shampoo for two consecutive weeks, the system will recognize this pattern and automatically increase the ratio of polyquaternium-67 and water, while also increasing the amount of guar gum hydroxypropyltrimethylammonium chloride added to strengthen the protective effect.

[0119] This invention discloses a silicone-free, dual-target softening agent for shampoo and its preparation method, comprising: precisely controlling the ratio of cationic polymers to natural oils; using guar gum hydroxypropyltrimethylammonium chloride and olive oil PEG-7 esters as core components, which respectively provide long-lasting smoothness and improve the scalp environment; by adjusting their ratio, it can adapt to different hair types and degrees of damage, avoiding decreased cleaning effect and dry hair problems caused by excessive residue; simultaneously, using microencapsulation technology to disperse moisturizing factors such as glycerin and butylene glycol in the formulation; by adjusting the thickness and hydrophilic-lipophilic balance (HLB) value of the encapsulation material, responsive release in response to changes in environmental humidity is achieved, thereby maintaining good smoothness of hair even in dry environments; furthermore, the buffer system is adjusted by a combination of citrate and citric acid, which can dynamically adjust its concentration according to changes in the pH of the scalp surface. To alleviate the opening of hair cuticles caused by alkaline cleansing ingredients, reducing friction and dryness, and to overcome the antagonism between cleansing and smoothing effects, this invention introduces an amphiphilic softening agent such as PPG-10 methyl glucoether. Its migration behavior is controlled by a surfactant concentration gradient, ensuring gentle penetration into the hair shaft during washing rather than remaining on the surface, thus improving the stability of the post-wash feel. Finally, based on the difference in surface charge density of hair, this invention introduces intelligently responsive polyquaternium-67 and hydrolyzed keratin of specific molecular weights to form a reversible regulatory mechanism for positive charge adsorption. This avoids the accumulation of excessive positive charge due to repeated use, preventing static electricity buildup and dirt adsorption. This preparation method, through the technical design of synergistic regulation of multiple factors, successfully solves many pain points existing in current silicone-free shampoos, improving product safety, gentleness, and user experience.

[0120] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A shampoo-based, silicone-free, two-way target softener, characterized in that, The following components are included by weight percentage: Water: 75-85%; Panthenol: 1-6%; Olive oil PEG-7 esters: 1-5%; Glycerin: 2-6%; Guar hydroxypropyltrimonium chloride: 1-3%; 1,2-pentanediol: 1.4-1.6%; Polyquaternium-67: 0.8-2%; Citric acid: 0.6-1.3%; Ethylhexylglycerin: 0.4-0.6%; PPG-10 methyl glucose ether: 0.3-1%; Hydrolyzed keratin: 0.065-0.08%; Butylene glycol: 0.008-0.012%; Phenoxyethanol: 0.0028-0.0036%.

2. A method for preparing a shampoo-silicon-free two-way target softener, characterized by, The regulating step of the ratio of cationic polymer and natural oil based on the degree of damaged hair further includes: Determining the relative content of cationic polymer and natural oil based on the degree of damaged hair; Adjusting the concentration of citrate dynamically based on the change of scalp pH to maintain the overall pH between 5-6.5; When the hair damage is severe, increasing the amount of olive oil PEG-7 esters and glycerin to enhance moisturizing and repairing effect; If the hair surface charge density value is greater than a set threshold then reduce the proportion of guar hydroxypropyltrimonium chloride and increase the amount of hydrolyzed keratin used, wherein, represents the hair surface charge density, represents a pre-set upper threshold value for limiting the risk of positive charge accumulation.

3. A method of preparing a shampoo-silicone free two-way target softener based on the shampoo according to claim 2, characterized in that, The regulating step of the ratio of cationic polymer and natural oil based on the degree of damaged hair further includes: Damaged flyaway index Dynamic adjustment of cationic polymer content; According to the amount of sebum secretion of the scalp Assessing the need for skin cleansing; If the environmental humidity is less than the critical value , then the moisturizing factor is added in the form of microcapsules to control the release rate; If the hair damage coefficient and the scalp pH value , then the ubiquinol proportion is reduced and the hydrolyzed keratin proportion is increased, wherein, represents the degree of hair damage, is the coefficient standard for determining high-damage hair, represents the scalp pH value, is the lower limit value of the appropriate pH control range.

4. A method of preparing a shampoo-silicon-free bidirectional target softener according to claim 3, characterized by, The regulating step of the release rate of microcapsule-encapsulated moisturizing factors based on environmental humidity changes further includes: Measuring water vapour pressure in a current environment ; Analysis the relationship between the hair surface moisture and the judgment of whether or not to enhance the moisturizing; Using intelligent temperature control mechanism to trigger microcapsule opening; If the air relative humidity and the surface evaporation rate a slow release program is initiated, wherein represents the air relative humidity, is the trigger point, is the moisture evaporation rate per unit area of the hair surface, is the evaporation sensitivity threshold.

5. A method of preparing a shampoo-silicon-free bidirectional target softener according to claim 4, characterized by, The step of adjusting the concentration of citrate in the buffer system based on scalp pH further includes: Real-time detection of scalp surface pH change frequency; if the pH fluctuation frequency exceeds a preset limit value then the double buffering system is activated; Reducing the amount of buffer ingredients when the pH decreases significantly; If the scalp pH value and the pKa value then the citrate proportion is increased to maintain stability, wherein, represents the current scalp pH value, is the lower value of the appropriate range, is the pKa value of the selected buffer system, represents the optimum balance point.

6. A method of preparing a shampoo-silicon-free bidirectional target softener according to claim 5, characterized by, The regulating step of the migration behavior of amphiphilic softening aids based on the surfactant concentration gradient during the washing process further includes: Detecting the change of foam layer thickness during the washing process; Gradually reducing the washing strength after the foam thickness reaches the peak; Dynamically adjusting the migration path of softening aids to prevent aggregation; If the foam volume is greater than a critical value and the aqueous solution viscosity is greater than a critical viscosity then the softener addition rate is limited, where, represents the foam volume, is the upper limit of the safe range, represents the solution viscosity, is the lower limit of the optimum flow range.

7. A method of preparing a shampoo-silicon-free bidirectional target softener according to claim 6, characterized by, The intelligent response regulating step of cationic adsorption based on the difference in surface charge density of hair further includes: Analyzing the charge distribution map of different regions; Selecting the appropriate cationic polymer based on the local charge density difference; Introducing natural amino acid complexes with neutralizing effect in high-frequency positive charge areas; If the local positive charge density is greater than a threshold and the time span is longer than a specified period, then a reverse charge shielding strategy is taken, wherein, denotes the local positive charge density, denotes the allowed maximum positive charge concentration threshold, is the continuous observation time.

8. The method for preparing a silicone-free bidirectional target softener for shampoo according to claim 7, characterized in that, The regulating step of the release rate of microcapsule-encapsulated moisturizing factors based on environmental humidity further includes: Continuous monitoring of air moisture content; If the humidity is below the comfort threshold then induce microcapsule rupture by photocatalysis to release the water retention factor; Using hygroscopic resin to synergistically improve water retention effect; If the humidity and the temperature then the release time is extended, wherein, denotes the actual air humidity, is the critical dry value, denotes the current temperature, is the ideal dry point temperature.

9. The method for preparing a silicone-free bidirectional target softener for shampoo according to claim 8, characterized in that, The regulating step of the migration behavior of amphiphilic softening agents based on the surfactant concentration gradient further includes: Setting the cleaning strength at the initial stage; Gradually weakening the cleaning strength until the mild stage is started; Inhibiting the aggregation of softening agents through electrostatic repulsion; If the detergent concentration and the contact time then introduce softener early for buffer adjustment, where, denotes the surfactant concentration, is the upper limit of the safe concentration, is the contact time, is the maximum tolerated duration; The regulating step of cationic polymer response based on the difference in surface charge density of hair further includes: Determining the direction of surface charge of hair cuticle; Using magnetic nanoparticles to identify the charging status of different regions; Applying a reversible neutralizing layer in areas with high positive charge concentration; If the charge distribution is uneven and the duration is then the dynamic response mechanism is activated, wherein, represents the degree of local charge unevenness, is the maximum value of the acceptance range, is the duration, is the maximum allowed time.

10. The method for preparing a silicone-free bidirectional target softener for shampoo according to claim 9, characterized in that, The intelligent adjustment step of the ratio of cationic polymer and natural oil based on the degree of damaged hair further includes: Recording the gloss and elasticity of hair after each use; Comprehensive damage index , (gloss, loss of elasticity); based on The ratio of cationic polymer to oil is automatically updated If the injury index and the duration of days , then automatically increase the amount of moisturizing factor, wherein, is a high damage determination threshold, is the observation days, is the recommended adjustment period.

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