High-stability thickening system and application

Abstract

The invention relates to the field of daily cosmetics, and mainly relates to a high-stability thickening system and application. The high-stability thickening system is prepared from the following components in parts by mass: 0.001 to 5.0 parts of cetostearyl alcohol, 0.001 to 3.0 parts of cocamide MEA, 0.001 to 3.5 parts of cocamide DEA and 0.1 to 3.0 parts of di (hydrogenated tallow) phthalic acid amide. The invention provides a thickening system with high stability and excellent skin feeling, and when the thickening system is applied to a personal care product, a lasting pearl effect can be brought, and the thickening system adapts to a wider formula environment.

Description

Technical Field

[0001] This application relates to the field of daily cosmetics, and mainly to a highly stable thickening system and its application. Background Technology

[0002] In cosmetic formulations, thickening systems are the core of building a product's framework. They not only directly affect the product's viscosity, rheology, and appearance (such as pearlescent effects), but are also closely related to the product's stability, spreadability, and final skin feel.

[0003] Currently, commonly used thickening systems include: 1. Polymer thickening systems (such as carbomer, acrylic (ester) copolymers, etc.): are sensitive to ions, are prone to "pilling" and usually feel sticky on the skin.

[0004] 2. Inorganic salt thickening systems (such as sodium chloride and ammonium chloride): mainly used in surfactant systems, they are sensitive to the pH value of the system, have limited thickening ability, and excessive addition may cause dryness on the skin and thinning of the product.

[0005] 3. Traditional fatty alcohol + surfactant compound system: This is currently the most common method for creams and lotions, typically using cetearyl alcohol combined with emulsifiers such as phenacetin and Tween. However, this type of system has the following drawbacks: (1) Stability challenges: It is sensitive to formulation processes (such as homogenization temperature and speed), and problems such as water separation and stratification are likely to occur during long-term storage.

[0006] (2) Monotonous skin feel: The cream is usually thick and oily, lacking the refreshing, silky, modern high-end skin feel.

[0007] (3) The pearlescent effect is not lasting: the added pearlescent flakes are prone to settling, resulting in uneven product appearance.

[0008] Therefore, there is an urgent need in the field to develop a new thickening system that can simultaneously achieve high stability, excellent skin feel (silky, refreshing and non-sticky) and long-lasting pearlescent effect, and can be adapted to a wider range of formulation environments. Summary of the Invention

[0009] In view of the shortcomings of the prior art, the purpose of this application is to provide a highly stable thickening system and application, aiming to provide a thickening system that takes into account both high stability and excellent skin feel.

[0010] The technical solution of this application is as follows: A highly stable thickening system comprising, by weight parts: 0.001-5.0 parts cetearyl alcohol, 0.001-3.0 parts cocamide MEA, 0.001-3.5 parts cocamide DEA, and 0.1-3.0 parts bis(hydrogenated tallow) phthalamide.

[0011] Furthermore, the amount of cocoamide DEA is 1.0 to 3.0 parts, and the amount of bis(hydrogenated tallow) phthalamide is 0.3 to 2.0 parts.

[0012] This thickening system utilizes four specially selected components to synergistically construct a three-dimensional network framework, achieving high stability and excellent skin feel. Cetearyl alcohol serves as the main framework, forming a lamellar crystalline network upon cooling. Cocamide MEA and cocamide DEA, through strong hydrogen bonding between amide bonds and fatty alcohol hydroxyl groups, create a "cement-skeleton"-like reinforcement effect, and their combination achieves multi-dimensional network strengthening. The phthalamide groups of di(hydrogenated tallow)phthalamide interact with amide compounds to form a highly efficient gel network, and its non-ionic properties endow the system with strong tolerance to ions and pH. The four components synergistically form a dense, elastic network, and its excellent stability has been verified through high-temperature (48℃), low-temperature (-10℃), and centrifugation experiments. Simultaneously, through hydrogen bond density regulation and intermolecular force balance, the cream achieves both richness and a light, silky feel, breaking away from the greasiness of traditional fatty alcohol systems and achieving a refreshing, non-sticky, and high-end skin feel. It is also insensitive to emulsification process conditions and has wide compatibility. This application also provides the application of a highly stable thickening system in personal care products.

[0013] Furthermore, the highly stable thickening system is added to personal care products at a rate of 0.1-10% by weight.

[0014] Furthermore, the highly stable thickening system is added to personal care products at a rate of 4-6% by weight.

[0015] Adding an appropriate amount of a highly stable thickening system to personal care products can achieve a good balance between formulation compatibility and performance. This highly stable thickening system exhibits excellent compatibility with surfactant systems, synergistically enhancing thickening efficiency and foam stability with anionic, cationic, and nonionic surfactants. Its nonionic properties avoid the ion sensitivity defects of traditional acrylic thickeners, providing strong resistance to hard water. Furthermore, by strengthening the network structure through hydrogen bonding and intermolecular interactions, it effectively prevents pearlescent flake sedimentation, extending product shelf life. It neither excessively increases system viscosity, affecting usability, nor fails to ensure sufficient network strength for long-term storage stability, making it suitable for various personal care products such as shampoos, shower gels, and conditioners.

[0016] Furthermore, in the preparation of the personal care product, the cetearyl alcohol, the cocoamide MEA, and the bis(hydrogenated tallow) phthalamide are added to an aqueous solvent and dissolved by stirring at 70-90°C. Then cool the temperature to 40-50℃, add the cocoamide DEA, and stir until well mixed.

[0017] Furthermore, when the personal care product is a shampoo, it comprises the following raw materials by weight percentage: 1-10% humectant, 10-30% surfactant, 0.001-2.5% pearlescent flakes, 0.1-10% highly stable thickening system, water; 0.1-1% preservatives, 0.1-5% hair conditioner, 0.01-1% fragrance and flavoring, pH adjuster.

[0018] Furthermore, the pearlescent flakes are 0.2% to 2.0%.

[0019] By controlling the amount of pearlescent flakes within a certain range, a precise balance between pearlescent effect and stability can be achieved through synergy with a highly stable thickening system. The pearlescent flakes form appropriate crystal sizes within the system, achieving uniform suspension through the three-dimensional network framework of the highly stable thickening system, preventing emulsion formation caused by precipitation or excessive density.

[0020] If the dosage is too low, the pearlescent effect will be insignificant and the stability will be poor; if the dosage is too high, the pearlescent agent may precipitate on the surface, affecting the uniformity of the product's appearance. Through hydrogen bonding with cocamide MEA and cocamide DEA, and the gel network reinforcement of bis(hydrogenated tallow) phthalamide, the pearl flakes form an oriented crystal structure during cooling, achieving a long-lasting and uniform pearlescent effect. At the same time, the viscosity of the system is maintained within an appropriate range, ensuring no sedimentation or stratification during long-term storage, and significantly extending the shelf life.

[0021] Furthermore, the moisturizer includes one or more of glycerin and propylene glycol; The surfactant includes one or a mixture of two or more of sodium lauryl ether sulfate, lauramidopropyl betaine, and C14-16 olefin sulfonate.

[0022] Furthermore, the method for preparing the shampoo includes the following steps: The humectant, the surfactant, the pearlescent flakes, the other raw materials of the high-stability thickening system except for cocamide DEA, and the water are mixed, heated to 80-90°C, and stirred evenly to obtain phase A; the mixture is kept warm and stirred until pearlescent appears. The A phase is cooled to 40-45℃, and the preservative, hair conditioner, fragrance, pH adjuster, and cocamide DEA from the high-stability thickening system are added. The mixture is stirred until homogeneous to obtain a premix. The premixed mixture is cooled to 38-40°C to obtain the shampoo.

[0023] Compared with the prior art, this application has the following beneficial effects: 1. Excellent stability: It can withstand high temperature (48℃), low temperature (-10℃) and centrifugation tests, and does not show water separation, layering or thinning during long-term storage.

[0024] 2. Long-lasting pearlescent effect: The pearlescent flakes can be evenly and stably suspended in the system and the pearlescent effect is produced upon cooling, without the need to wait for a week or more. The product has a bright and long-lasting appearance and a long shelf life.

[0025] 3. Unique and superior skin feel: The resulting product has a delicate texture, is rich yet not heavy, spreads well, and feels silky, refreshing, and non-sticky on the skin.

[0026] 4. Wide applicability to formulations: It has better tolerance to ions and pH values ​​than acrylic thickeners and can be applied to a wider range of formulation systems.

[0027] 5. Simplified process: This system is not sensitive to emulsification and homogenization process conditions, making it easy to control production and scale up production. Attached Figure Description

[0028] Figure 1 This is a physical image of the shampoo from Embodiment 1 of this application.

[0029] Figure 2 This is a state diagram of the shampoo of Example 1 of this application after being centrifuged at 3000 rpm / min for 30 minutes at room temperature.

[0030] Figure 3 This is a diagram showing the state of the shampoo from Example 1 of this application after being stored at high temperature (48±2℃) for 3 months.

[0031] Figure 4 This is a diagram showing the state of the shampoo from Example 1 of this application after being stored at a low temperature (-10±2℃) for 3 months.

[0032] Figure 5 This is a diagram showing the state of the shampoo of Example 1 of this application after being stored at room temperature (25±2℃) for 3 months. Detailed Implementation

[0033] This application provides a highly stable thickening system and its application. To make the purpose, technical solution, and effects of this application clearer and more explicit, the following provides a more detailed description. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0034] This application provides a highly stable thickening system comprising, by weight parts: 0.001-5.0 parts cetearyl alcohol, 0.001-3.0 parts cocamide MEA, 0.001-3.5 parts cocamide DEA, and 0.1-3.0 parts bis(hydrogenated tallow) phthalamide.

[0035] More preferably, cetearyl alcohol is 0.1 to 2.0 parts, cocamide MEA is 0.5 to 2.5 parts, cocamide DEA is 1.0 to 3.0 parts, and bis(hydrogenated tallow) phthalamide is 0.3 to 2.0 parts.

[0036] Through extensive creative work, the inventors discovered that combining the aforementioned specific raw materials produced an unexpected synergistic effect, as detailed below: 1. Construction of the 3D network skeleton: Cetearyl alcohol serves as the main framework and crystallizes during cooling to form a lamellar network structure, which is the basis for thickening.

[0037] Cocamide MEA and cocamide DEA, as alkanolamides, can form strong hydrogen bonds with the hydroxyl groups of fatty alcohols through their amide bonds. Like "cement," these bonds fill and reinforce the crystalline network of cetearyl alcohol, making the structure denser and more robust. The combination of these two compounds can enhance network strength in different dimensions.

[0038] 2. Highly efficient gelation and suspension effect: Di(hydrogenated tallow-based) phthalamide is a highly efficient nonionic gelling agent. The phthalamide groups in its molecule can generate unique intermolecular interactions with amide compounds, greatly enhancing the strength and elasticity of the entire gel network. It can "fix" liquid oils in the network, thereby significantly improving the system's stability under high temperature, freeze-thaw, and centrifugation conditions, and effectively preventing the sedimentation of pearlescent flakes.

[0039] 3. Synergistic optimization of skin feel: Traditional fatty alcohol systems tend to feel oily and suffocating on the skin. In this system, cocamide MEA and cocamide DEA themselves provide a smooth feel, while the addition of di(hydrogenated tallow) phthalamides allows the cream to have a rich texture while breaking away from the greasiness, giving the product a light, silky, easy-to-spread, refreshing, and non-sticky premium feel.

[0040] This application provides a highly stable thickening system that can be widely used in various personal care products, such as shampoos, conditioners, shower gels, and facial cleansers.

[0041] The amount of the highly stable thickening system added to personal care products is preferably 0.1-10% by weight. More preferably, the amount added is 4-6%.

[0042] An application of a highly stable thickening system in the preparation of personal care products involves adding cetearyl alcohol, cocamide MEA, and bis(hydrogenated tallow) phthalamide to an aqueous solvent, stirring while heating to 70-90°C, and maintaining the temperature while stirring until dissolved.

[0043] Then cool to 40-50℃, add cocamide DEA, and stir well. Taking shampoo as an example, the raw materials for shampoo preparation, by weight percentage, include: 1-10% humectant, 10-30% surfactant, 0.001-2.5% pearlescent flakes, 0.1-10% highly stable thickening system, and water.

[0044] Moisturizers include, but are not limited to, glycerin and propylene glycol.

[0045] If the moisturizers include glycerin and propylene glycol, the percentage of glycerin and propylene glycol should be 1-5% by weight of the shampoo. Surfactants include, but are not limited to, sodium lauryl ether sulfate, lauramidopropyl betaine, and sodium C14-16 olefin sulfonate.

[0046] 0.1-1% preservatives, 0.1-5% hair conditioner, 0.01-1% fragrance and flavoring, pH adjuster.

[0047] Preservatives include phenoxyethanol.

[0048] Hair conditioning agents include, but are not limited to, guar hydroxypropyltrimethylammonium chloride, polyquaternium-7, and polyquaternium-10.

[0049] pH adjusters include citric acid, which adjusts the pH to 5.0-7.0.

[0050] Preferably, the pearlescent flake content is 0.2% to 2.0%.

[0051] The preparation method of shampoo includes the following steps: Step A: Mix the humectant, surfactant, pearl flakes, highly stable thickening system (except cocamide DEA), and water, heat to 80-90℃, and stir until homogeneous to obtain phase A; Step B: Keep warm and stir until pearlescent appears.

[0052] Step C: Cool the main pot (phase A) to 40-45℃, add preservatives, hair conditioner, fragrance, pH adjuster and cocamide DEA from the high-stability thickening system, stir well to obtain a premix; Step D: Cool the premix to 38-40℃, filter and discharge to obtain shampoo.

[0053] The present application will be further described below through specific embodiments.

[0054] Example 1 A shampoo, comprising, by weight percentage, the following ingredients: 3% glycerin, 3% propylene glycol, 20% sodium lauryl ether sulfate (commercially available, 70% active content), 10% lauramidopropyl betaine (commercially available, 30% active content), 2% pearlescent flakes, 5% high-stability thickening system, water; 1% phenoxyethanol, 3% hair conditioner, 1% fragrance, citric acid.

[0055] The hair conditioner is guar hydroxypropyltrimethylammonium chloride.

[0056] Citric acid was used to adjust the pH of the system to 6.0, and water was added to bring the balance to 100%.

[0057] Highly stable thickening systems include cetearyl alcohol, cocamide MEA, cocamide DEA, and bis(hydrogenated tallow) phthalamide.

[0058] Cetearyl alcohol is 0.5 kg, cocamide MEA is 1.0 kg, cocamide DEA is 2 kg, and bis(hydrogenated tallow) phthalamide is 1.5 kg.

[0059] The raw materials and quantities used in the preparation of shampoo are summarized in Table 1.

[0060] The preparation method of shampoo includes the following steps: Step A: Mix the humectant, surfactant, pearlescent flakes, highly stable thickening system (except cocamide DEA), and water, heat to 85°C, and stir until homogeneous to obtain phase A.

[0061] Step B: Keep warm and stir until pearlescent appears.

[0062] Step C: Cool the main pot (phase A) to 42°C, add preservatives, hair conditioner, fragrance, pH adjuster and cocamide DEA from the high-stability thickening system, stir well to obtain a premix.

[0063] Step D: Cool the premix to 38°C, filter and discharge to obtain shampoo.

[0064] Reference Figure 1The continuous fluidity and pearlescent effect of the shampoo emulsion can be seen, indicating that the thickening system has a moderate consistency, is easy to foam and spread, and has excellent skin feel, as well as good uniformity and stability.

[0065] Reference Figure 2 The image shows the state of the shampoo from Example 1 after centrifugation at 3000 rpm / min for 30 minutes at room temperature. It can be seen that the emulsion remains homogeneous, without any floating oil or layering, indicating that the system has uniform droplet distribution, a strong interfacial film that resists aggregation and separation, and excellent physical stability of the suspension system.

[0066] Example 2 The difference from Example 1 is that the mass percentage of the highly stable thickening system is 5.5%, as detailed in Table 1.

[0067] In a highly stable thickening system, the amount of each component varies, as detailed in Table 2.

[0068] Example 3 The difference from Example 1 is that the mass percentage of the highly stable thickening system is 5.5%, as detailed in Table 1.

[0069] In a highly stable thickening system, the amount of each component varies, as detailed in Table 2.

[0070] Example 4 The difference from Example 1 is that the mass percentage of the highly stable thickening system is 6%, as detailed in Table 1.

[0071] In a highly stable thickening system, the amount of each component varies, as detailed in Table 2.

[0072] Example 5 The difference from Example 1 is that the mass percentage of the highly stable thickening system is 5.5%, as detailed in Table 1.

[0073] In a highly stable thickening system, the amount of each component varies, as detailed in Table 2.

[0074] Example 6 The difference from Example 1 is that the mass percentage of the highly stable thickening system is 6.5%, as detailed in Table 1.

[0075] In a highly stable thickening system, the amount of each component varies, as detailed in Table 2.

[0076] Example 7 The difference from Example 1 is that the mass percentage of the highly stable thickening system is 4%, as detailed in Table 1.

[0077] In a highly stable thickening system, the amount of each component varies, as detailed in Table 2.

[0078] Example 8 The difference from Example 1 is that the mass percentage of the highly stable thickening system is 6%, as detailed in Table 1.

[0079] In a highly stable thickening system, the amount of each component varies, as detailed in Table 2.

[0080] Table 1

[0081] Table 2

[0082] Comparative Example 1 The difference from Example 1 is that the mass percentage of the highly stable thickening system is 3.5%, as detailed in Table 3.

[0083] In a highly stable thickening system, the amount of each component varies, as detailed in Table 2.

[0084] Comparative Example 2 The difference from Example 1 is that the mass percentage of the highly stable thickening system is 4%, as detailed in Table 3.

[0085] In a highly stable thickening system, the amount of each component varies, as detailed in Table 2.

[0086] Comparative Example 3 The difference from Example 1 is that the mass percentage of the highly stable thickening system is 4.5%, as detailed in Table 3.

[0087] In a highly stable thickening system, the amount of each component varies, as detailed in Table 2.

[0088] Comparative Example 4 The difference from Example 1 is that the mass percentage of the highly stable thickening system is 3%, as detailed in Table 3.

[0089] In a highly stable thickening system, the amount of each component varies, as detailed in Table 2.

[0090] Table 3

[0091] Performance testing: 1. Viscosity test The shampoos of Examples 1-8 and Comparative Examples 1-4 were left at room temperature for 20 hours, and then tested with a viscometer (NDJ-1 rotational viscometer 4#12, 25℃). The viscosity was recorded in Table 4.

[0092] After obtaining the shampoo in step D, wait for the material to return to room temperature, observe the appearance of the shampoo under light, and record it in Table 4.

[0093] Table 4

[0094] 2. Centrifugal stability test The shampoos from Examples 1-8 and Comparative Examples 1-4 were centrifuged for 30 minutes at four different conditions: 25°C (3000 rpm / min, 4000 rpm / min) and 48°C (3000 rpm / min, 4000 rpm / min). The product separation and oil floating conditions were then observed. The results are recorded in Table 5.

[0095] Table 5

[0096] 3. Storage stability test The shampoos from Examples 1-8 and Comparative Examples 1-4 were placed in constant temperature incubators at high temperature (48±2℃), room temperature (25±2℃), and low temperature (-10±2℃) for 60 days, respectively. The samples were observed under an optical microscope for any foreign solid precipitation, layering, discoloration, emulsion homogeneity, etc. The results are recorded in Table 6.

[0097] Table 6

[0098] Regarding discoloration: Discoloration of the material is a common macroscopic change in high-temperature accelerated testing, indicating an abnormality in the product. In all tests, the shampoos in Examples 1-8 and Comparative Examples 1-4 showed no discoloration.

[0099] 4. Sensory evaluation 4.1: Eight subjects were selected and their shampoos were used in Examples 1 and 6, as well as two commercially available shampoos. Consumer testing (questionnaire) was then conducted to evaluate their results.

[0100] The evaluation results are shown in Table 7. (The test results are divided into four levels: Poor, Average, Good, and Excellent.) Table 7

[0101] Regarding stickiness, "poor" means not sticky.

[0102] 4.2 Subject Information 4.2.1: Selection Criteria ① Healthy individuals aged 18 to 45; ② Participants must voluntarily participate in this trial and be able to sign an informed consent form; ③Those who can complete the test as required, maintain a regular lifestyle, avoid ultraviolet radiation, and do not use anti-allergy drugs during the entire experimental observation period.

[0103] 4.2.2: Exclusion Criteria Subjects meeting any of the following criteria must be excluded; ①Those who have used antihistamines in the past week or immunosuppressants in the past month; ②Those who are currently participating in or have been participating in other clinical trials within the past three months; ③ Individuals with highly sensitive constitutions or those known to be allergic to any of the ingredients in this product; ④Pregnant or breastfeeding women, or those who plan to conceive in the near future; ⑤ Those who have undergone cosmetic procedures within the past 3 months; ⑥ Individuals with severe systemic diseases, or those with immunodeficiency or autoimmune diseases; ⑦ Participants in other clinical trial investigations; ⑧ Patients who have undergone bilateral mastectomy and lateral axillary lymph node removal; ⑨ Those who have received anti-cancer chemotherapy within the past six months.

[0104] 4.2.3 Precautions ①During the trial, participants are required to continue using their current facial care products, cosmetics, etc. ②During the trial, participants must maintain a normal daily routine; ③ During the trial, participants must ensure that they do not use products of the same type and function as the test sample; ④ During the trial, participants must ensure that they do not participate in any other clinical trials at other research centers.

[0105] 4.2.4 Adverse Events No adverse reactions were observed in the subjects during product use.

[0106] 5. pH tolerance: pH tolerance tests were conducted on the high-stability thickening systems of Examples 1-2 and the commonly available acrylic thickening systems 1 and 2. The test results are detailed in Table 8.

[0107] The highly stable thickening systems of Examples 1-2 and the commonly available acrylic thickening systems 1 and 2 were used in shampoos. The specific preparation method and raw materials of the shampoos were the same as those of the shampoos of Example 1, except for the pH adjustment.

[0108] Table 8

[0109] According to the test data in Table 8, when the pH is 7.0, the viscosity of different systems ranges from 45,000 mPa·s to 50,000 mPa·s. However, as the pH of the material decreases, the viscosity of the acrylic system shows a significant decreasing trend, while the viscosity of the materials in Examples 1 and 2 decreases more slowly. Therefore, it can be inferred that the highly stable thickening systems of Examples 1 and 2 have better stability under pH fluctuations than the acrylic system.

[0110] Based on the aforementioned series of test data, the shampoos of Examples 1-8 exhibit suitable viscosity, good centrifugal stability, and maintain excellent stability under high temperature, low temperature, and room temperature storage conditions. In contrast, Comparative Examples 1-4, by disrupting the specific composition of the highly stable thickening system to varying degrees, showed a significant downward trend in all aspects of performance. This demonstrates that the highly stable thickening system provided in this application can indeed provide excellent and stable thickening effects.

[0111] According to the sensory evaluation results, the shampoos in Examples 1 and 6 provided subjects with a better positive experience, such as a lighter and silkier feel, and were not sticky, showing better performance than commercially available shampoos. This indicates that the application of a highly stable thickening system in downstream products can provide a better user experience.

[0112] It should be understood that the application of this application is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of this application.

Claims

1. A highly stable thickening system, characterized in that, According to the mass fractions, it includes the following components: 0.001~5.0 parts cetearyl alcohol, 0.001~3.0 parts cocamide MEA, 0.001~3.5 parts cocamide DEA, and 0.1~3.0 parts bis(hydrogenated tallow) phthalamide.

2. The highly stable thickening system according to claim 1, characterized in that, The cetearyl alcohol is 0.1-2.0 parts, the cocoamide MEA is 0.5-2.5 parts, the cocoamide DEA is 1.0-3.0 parts, and the bis(hydrogenated tallow) phthalamide is 0.3-2.0 parts.

3. The application of a highly stable thickening system based on any one of claims 1-2 in personal care products.

4. The application of the highly stable thickening system according to claim 3 in personal care products, characterized in that, The highly stable thickening system is added to personal care products at a rate of 0.1-10% by weight.

5. The application of the highly stable thickening system according to claim 4 in personal care products, characterized in that, The highly stable thickening system is added to personal care products at a rate of 4-6% by weight.

6. The application of the highly stable thickening system according to claim 3 in personal care products, characterized in that, In preparing the personal care product, the cetearyl alcohol, the cocoamide MEA, and the bis(hydrogenated tallow) phthalamide are added to an aqueous solvent and dissolved by stirring at 70-90°C. Then cool the temperature to 40-50℃, add the cocoamide DEA, and stir until well mixed.

7. The application of the highly stable thickening system according to claim 3 in personal care products, characterized in that, When the personal care product is a shampoo, it comprises the following raw materials by weight percentage: 1-10% humectant, 10-30% surfactant, 0.001-2.5% pearlescent flakes, 0.1-10% highly stable thickening system, water; 0.1-1% preservatives, 0.1-5% hair conditioner, 0.01-1% fragrance and flavoring, pH adjuster.

8. The application of the highly stable thickening system according to claim 7 in personal care products, characterized in that, The pearlescent flakes are 0.2% to 2.0%.

9. The application of the highly stable thickening system according to claim 7 in personal care products, characterized in that, The moisturizer includes one or a mixture of two of glycerin and propylene glycol; The surfactant includes one or a mixture of two or more of sodium lauryl ether sulfate, lauramidopropyl betaine, and C14-16 olefin sulfonate.

10. The application of the highly stable thickening system according to claim 7 in personal care products, characterized in that, The method for preparing the shampoo includes the following steps: The humectant, the surfactant, the pearlescent flakes, the other raw materials of the high-stability thickening system except for cocamide DEA, and the water are mixed, heated to 80-90°C, and stirred evenly to obtain phase A; the mixture is kept warm and stirred until pearlescent appears. The A phase is cooled to 40-45℃, and the preservative, hair conditioner, fragrance, pH adjuster, and cocamide DEA from the high-stability thickening system are added. The mixture is stirred until homogeneous to obtain a premix. The premixed mixture is cooled to 38-40°C to obtain the shampoo.

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