Hexagonal liquid crystal cleansing gel and preparation method thereof

Abstract

The invention relates to the technical field of face cleansing gels, in particular to a hexagonal liquid crystal face cleansing gel and a preparation method thereof.The hexagonal liquid crystal face cleansing gel at least comprises, by mass, a phase A: 20-26% of sodium lauroyl sarcosinate and 0-1.5% of an auxiliary surfactant; a phase B: 3-8% of propylene glycol laurate; a phase C: 0.01%-4.5% of glycerol laurate; phase D: 1 to 5 percent of polyglycerol-2 laurate; 0-2% of an auxiliary agent; and deionized water: complementing the balance. By optimizing a product formula system, an amino acid cleansing product which has a transparent appearance similar to that of micelle type amino acid cleansing cream, can not depend on addition of a large number of polymers to assist thickening and shows a non-flowing appearance texture is prepared, and the amino acid cleansing product has extremely high market application and popularization value.

Description

Technical Field

[0001] The invention relates to the technical field of facial cleansing gels, in particular to a hexagonal liquid crystal facial cleansing gel and a preparation method thereof. Background Art

[0002] Facial cleansers are essential for modern life, removing daily physiological oils and dirt from the face, as well as exogenous impurities such as dust and particulate matter, thereby maintaining the skin's normal physiological functions. Traditional facial cleansers are primarily made with potassium and sodium salts of fatty acids (soap-based cleansers). These products have strong degreasing properties, which can lead to a feeling of tightness after washing and even imbalances in oil secretion, exacerbating oiliness. With the advancement of surfactant synthesis technology, amino acid-derived surfactants (abbreviated as "amino acid surfactants") are increasingly used as the primary cleansing ingredient in mainstream and high-end facial cleansers. Common amino acid surfactants used in the cosmetics industry include acyl glutamates (such as sodium cocoyl glutamate), acyl glycinates (such as potassium cocoyl glycinate), and acyl sarcosinates (such as sodium lauroyl sarcosinate). Their pH values ​​are close to those of the skin (weakly acidic or weakly alkaline), and they are low in irritation, making them suitable for sensitive skin and infant products. They have moderate cleaning power, can remove dirt and retain skin lipids. They are easily decomposed by the environment and are more environmentally friendly than traditional surfactants (such as sodium lauryl sulfate).

[0003] Currently, facial cleansing products using amino acid surfactants as the primary surfactant (referred to as "amino acid cleansing products") on the market primarily come in two types: cream-forming and micellar types. Cream-forming amino acid cleansing products are typically formulated with sodium cocoyl glycine or sodium cocoyl glutamate (with carbon chain atoms ≥12), a co-surfactant such as glyceryl stearate, and glycerin. They exhibit a milky, opaque cream appearance and are popular with consumers for their excellent spreadability and creamy texture. However, cream-forming amino acid cleansing products are prone to instability, such as water release and delamination, at high temperatures, even at 25°C. This can affect product quality and reduce the consumer experience. A Chinese patent (authorization publication number CN119214948B) discloses an amino acid cleansing product and its preparation method. These products utilize glycerin and diglycerin simultaneously in a cream-forming amino acid cleansing product to form a stable lamellar liquid crystal structure, enhancing stability and a refreshing feel. Micellar amino acid cleansing products appear as a transparent, flowing, viscous liquid. Although their stability is significantly better than that of paste-forming amino acid cleansing products, amino acid surfactants have a lower viscosity and are not sensitive to the "salt thickening" mechanism. Therefore, in order to make the micellar cleansing cream reach a gel state where it will not flow when placed in an inverted position, it is usually necessary to compound a high content of polymers to assist in thickening. This will significantly affect the feel of micellar amino acid cleansing products, creating the risk of "fake slipperiness" and residual polymer thickeners. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a hexagonal liquid crystal cleansing gel. By optimizing the product formula system, an amino acid cleansing product with a transparent appearance similar to that of a micellar amino acid cleansing cream is prepared, but at the same time, it does not rely on the addition of a large amount of polymers to assist in thickening, and presents a non-flowing appearance and texture. It has extremely high market application and promotion value.

[0005] In one aspect, the present invention provides a hexagonal liquid crystal cleansing gel comprising at least the following components by mass percentage: Phase A: sodium lauroyl sarcosine 20-26%, auxiliary surfactant 0-1.5%; Phase B: Propylene glycol laurate 3-8%; Phase C: Glyceryl Laurate 0.01-4.5%; Phase D: Polyglyceryl-2 Laurate 1-5%; Additives: 0-2%; Deionized water: Make up the balance.

[0006] The present invention successfully prepares a hexagonal liquid crystal cleansing gel by introducing sodium lauroyl sarcosine as the main surfactant, compounding glyceryl laurate, propylene glycol laurate and polyglyceryl-2 laurate and 0-1.5wt% of an auxiliary surfactant. The product has the non-flowing gel properties of a paste-type amino acid cleansing product, while also having a micellar transparent appearance, effectively overcoming the defects of single paste-type and micellar amino acid cleansing products and better meeting market demand. Furthermore, based on a large number of research findings, the present invention effectively obtains a cleansing gel product containing a hexagonal liquid crystal structure by controlling the addition amount of each surfactant in the system, while ensuring that the product has excellent high and low temperature stability and cleaning performance. The possible reasons are: within a specific range of added amounts, sodium lauroyl sarcosine, glyceryl laurate, propylene glycol laurate, polyglyceryl-2 laurate and 0-1.5wt% of auxiliary surfactants interact to form a hexagonal liquid crystal structure. This structure is composed of extremely long special cylindrical micelle units, forming a gel network, which can present a transparent gel appearance different from micelle-type cleansing products; subsequently, it can easily intervene in the interface between the water and oil phases, causing the dirt components to dissolve well in the aqueous medium, giving the product excellent cleaning performance.

[0007] In one embodiment, the auxiliary surfactant is selected from at least one of butylene glycol laurate, sodium methyl lauroyl taurate, lauryl glucoside or potassium cocoyl glycinate.

[0008] In one embodiment, the auxiliary surfactant is selected from butylene glycol laurate or sodium methyl lauroyl taurate.

[0009] In one embodiment, the addition amount of the sodium lauroyl sarcosine salt is 21-25 wt %.

[0010] In one embodiment, the addition amount of the sodium lauroyl sarcosine salt is 22.05-24.75 wt %.

[0011] In one embodiment, the sodium lauroyl sarcosinate is derived from an aqueous solution of sodium lauroyl sarcosinate, and the content of the sodium lauroyl sarcosinate in the aqueous solution is 20-40 wt %.

[0012] In one embodiment, the content of sodium lauroyl sarcosinate in the sodium lauroyl sarcosinate aqueous solution is 30 wt %, and the trade name is Ucefactant LS-30N(N), which is sourced from Guangzhou Xingye Technology Co., Ltd.

[0013] In one embodiment, the auxiliary agent includes at least a preservative and a pigment.

[0014] In one embodiment, the amount of the preservative added is 0.1-1 wt %.

[0015] In one embodiment, the pigment is added in an amount of 0.001-0.01 wt %.

[0016] In one embodiment, the preservative is selected from at least one of methylparaben, ethylparaben, p-hydroxyacetophenone, and 1,2-hexanediol.

[0017] In one embodiment, the preservative is a combination of methylparaben and ethylparaben, and the mass ratio of methylparaben to ethylparaben is (2-3):1.

[0018] In one embodiment, the preservative is a combination of p-hydroxyacetophenone and 1,2-hexanediol, and the mass ratio of p-hydroxyacetophenone to 1,2-hexanediol is (0.5-1):1.

[0019] In one embodiment, the pigment includes at least one of a blue pigment, a red pigment, or a yellow pigment.

[0020] In one embodiment, the pigment comprises blue pigment (CI 42090).

[0021] In one embodiment, the hexagonal liquid crystal cleansing gel comprises at least the following components by mass percentage: Phase A: 73.5-82.5% aqueous solution of sodium lauroyl sarcosinate, 0-5% deionized water, 0-0.5% co-surfactant; Phase B: Propylene glycol laurate 5-7.5%; Phase C: Glyceryl Laurate 0.01-4.5%; Phase D: Polyglyceryl-2 Laurate 1-5%; Preservatives: 0.4-0.6%; Pigment: 0.005%; Deionized water: Make up the balance.

[0022] In one embodiment, the raw materials for preparing the hexagonal liquid crystal cleansing gel further include active ingredients.

[0023] The hexagonal liquid crystal cleansing gel provided by the present invention can be added with any effective amount of active ingredients and applied in the fields of pharmacy and cosmetics. The hexagonal liquid crystal can encapsulate the active ingredients inside its lipophilic core to prepare a sustained-release medicine. The hexagonal liquid crystal can carry and encapsulate active substances to prepare cosmetics, providing a new idea for the development of cosmetics and medicines.

[0024] On the other hand, the present invention provides a method for preparing a hexagonal liquid crystal cleansing gel, which comprises at least the following steps: mixing the raw materials of phase A to prepare phase A; mixing phases B, C and D to obtain a mixed liquid; adding the mixed liquid to phase A to obtain a hexagonal liquid crystal gel system; and adding additives and deionized water to the hexagonal liquid crystal gel system and stirring and mixing.

[0025] In one embodiment, the preparation method of the hexagonal liquid crystal cleansing gel comprises the following steps: mixing the raw materials of phase A at 60-80°C to prepare phase A; mixing phases B, C and D at 60-80°C to obtain a mixed liquid; adding the mixed liquid to phase A at 60-80°C and a stirring speed of 100-1000 rpm to obtain a hexagonal liquid crystal gel system; cooling the hexagonal liquid crystal gel system to 50-55°C, adding an auxiliary agent and stirring to mix, and adding deionized water and stirring to cool to 20-30°C.

[0026] In one embodiment, the stirring speed is 200-400 rpm.

[0027] The present invention is based on phase A, phase B, phase C, phase D and other raw materials in the system, and designs a hexagonal liquid crystal gel system by mixing phase B, phase C and phase D and then controlling the temperature and rotation speed to add them to phase A. The method is simple, easy to control, has excellent product performance, and is easy to achieve large-scale industrial production.

[0028] Beneficial effects 1. The present invention provides a hexagonal liquid crystal cleansing gel. By optimizing the product formula system, an amino acid cleansing product with a transparent appearance similar to that of a micellar amino acid cleansing cream is prepared, but at the same time, it does not rely on the addition of a large amount of polymer to assist in thickening, and presents a non-flowing appearance and texture. It has extremely high market application and promotion value.

[0029] 2. The present invention successfully prepares a hexagonal liquid crystal cleansing gel by introducing sodium lauroyl sarcosine as the main surfactant, compounding glyceryl laurate, propylene glycol laurate and polyglyceryl-2 laurate and 0-1.5wt% of auxiliary surfactants. This product has the non-flowing gel properties of a paste-type amino acid cleansing product, and at the same time has a micellar transparent appearance, effectively overcoming the defects of single paste-type and micellar amino acid cleansing products, and better meeting market demand.

[0030] 3. The present invention effectively obtains a cleansing gel product containing a hexagonal liquid crystal structure by controlling the addition amount of each surfactant in the system, while ensuring that the product has excellent high and low temperature stability and cleaning performance.

[0031] 4. The hexagonal liquid crystal cleansing gel provided by the present invention can be added with any effective amount of active ingredients and applied in the fields of pharmacy and cosmetics. The hexagonal liquid crystal can encapsulate the active ingredients inside its lipophilic core to prepare sustained-release medicines; the hexagonal liquid crystal can carry and encapsulate active substances to prepare cosmetics, providing a new idea for the development of cosmetics and medicines.

[0032] 5. Based on phase A, phase B, phase C, phase D and other raw materials in the system, the present invention is designed to obtain a hexagonal liquid crystal gel system by mixing phase B, phase C and phase D and then controlling the temperature and rotation speed to add them to phase A. The method is simple, easy to control, has excellent product performance, and is easy to achieve large-scale industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 These are pictures of the appearance of Examples 1-4 after standing at 35° C. for 30 minutes, and from left to right they correspond to Examples 1-4.

[0034] Figure 2 These are appearance pictures of comparative examples 1-6 after standing at 35° C. for 30 minutes, and from left to right they correspond to comparative examples 1-6.

[0035] Figure 3 1-4 are polarizing microscope images of Examples 1-4, where ad corresponds to Examples 1-4 respectively.

[0036] Figure 4 These are polarizing microscope images of comparative examples 1-6, where ej correspond to comparative examples 1-6 respectively.

[0037] Figure 5 1 is the SAXS spectrum of Examples 1-4, where ad corresponds to Examples 1-4 respectively.

[0038] Figure 6 2 are SAXS spectra of comparative examples 1-5, where e and j correspond to comparative examples 1-5, respectively. DETAILED DESCRIPTION

[0039] The brands and sources of the raw materials in the examples and comparative examples of the present invention are shown in Table 1.

[0040] Table 1

[0041] Examples 1-4, Comparative Examples 1-6 Examples 1-4 and Comparative Examples 1-6 of the present invention provide a hexagonal liquid crystal cleansing gel. The raw materials for its preparation are shown in Table 2, calculated by mass percentage.

[0042] Table 2

[0043] On the other hand, Example 1 of the present invention provides a method for preparing a hexagonal liquid crystal cleansing gel, comprising the following steps: mixing the raw materials of phase A at 70°C to prepare phase A; mixing phases B, C and D at 70°C to obtain a mixed liquid; adding the mixed liquid to phase A at 70°C and a stirring speed of 300 rpm to obtain a hexagonal liquid crystal gel system; cooling the hexagonal liquid crystal gel system to 55°C, adding preservatives and pigments and stirring to mix, and adding deionized water and stirring to cool to 25°C.

[0044] On the other hand, Example 2 of the present invention provides a method for preparing a hexagonal liquid crystal cleansing gel, and its specific implementation method is the same as that of Example 1.

[0045] On the other hand, Example 3 of the present invention provides a method for preparing a hexagonal liquid crystal cleansing gel, comprising the following steps: mixing the raw materials of phase A at 80°C to prepare phase A; mixing phases B, C and D at 80°C to obtain a mixed liquid; adding the mixed liquid to phase A at 80°C and a stirring speed of 300 rpm to obtain a hexagonal liquid crystal gel system; cooling the hexagonal liquid crystal gel system to 55°C, adding preservatives and pigments and stirring to mix, and adding deionized water and stirring to cool to 25°C.

[0046] On the other hand, Example 4 of the present invention provides a method for preparing a hexagonal liquid crystal cleansing gel, comprising the following steps: mixing the raw materials of phase A at 75°C to prepare phase A; mixing phases B, C and D at 75°C to obtain a mixed liquid; adding the mixed liquid to phase A at 75°C and a stirring speed of 300 rpm to obtain a hexagonal liquid crystal gel system; cooling the hexagonal liquid crystal gel system to 55°C, adding preservatives and pigments and stirring to mix, and adding deionized water and stirring to cool to 25°C.

[0047] Comparative Examples 1 and 2 of the present invention provide a method for preparing a hexagonal liquid crystal cleansing gel, and the specific implementation method thereof is the same as that of Example 1.

[0048] Comparative Example 3 of the present invention further provides a method for preparing a hexagonal liquid crystal cleansing gel, and its specific implementation method is the same as that of Example 3.

[0049] Comparative Example 4 of the present invention further provides a method for preparing a hexagonal liquid crystal cleansing gel, and its specific implementation method is the same as that of Example 4.

[0050] Comparative Examples 5 and 6 of the present invention provide a method for preparing a hexagonal liquid crystal cleansing gel, and the specific implementation method thereof is the same as that of Example 1.

[0051] Performance Testing 1. Appearance at room temperature: Observe the appearance of the products provided in the Examples and Comparative Examples at 25°C. See Table 3 for the results.

[0052] 2. High temperature gel retention: The products provided in the examples and comparative examples were allowed to stand at 35°C for 30 minutes and the flow state of the products was observed. The results are shown in Table 3 and Figure 1 、 Figure 2 .

[0053] 3. High temperature stability: The products provided in the examples and comparative examples were placed at 48° C. for 30 days, and the changes in the appearance of the products were observed. The results are shown in Table 3.

[0054] 4. Low temperature stability: The products provided in the examples and comparative examples were placed at -10°C for 30 days, and the changes in the appearance of the products were observed. The results are shown in Table 3.

[0055] 5. Polarized microscope images of the products provided in the examples and comparative examples were examined (25°C). The results are shown in Table 3 and Figure 3 、 Figure 4 .

[0056] 6. The products provided in the examples and comparative examples were subjected to X-ray scattering small angle test (SAXS, 25°C). The results are shown in Table 3 and Figure 5 、 Figure 6 .

[0057] Table 3 Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Normal temperature appearance Transparent to almost transparent, gel-like, non-flowing at room temperature Transparent to almost transparent, gel-like, non-flowing at room temperature Transparent to almost transparent, gel-like, non-flowing at room temperature Transparent to almost transparent, gel-like, non-flowing at room temperature Flow state Flow state Flow state Flow state Flow state Flow state High temperature gel retention No flow No flow No flow No flow Flow state Flow state Flow state Flow state Flow state Flow state High temperature stability No change in appearance No change in appearance No change in appearance No change in appearance Layering Layering No change in appearance Layering No change in appearance No change in appearance Low temperature stability No change in appearance No change in appearance No change in appearance No change in appearance Layering Layering No change in appearance No change in appearance No change in appearance No change in appearance Polarizing microscope Contains hexagonal liquid crystal structure Contains hexagonal liquid crystal structure Contains hexagonal liquid crystal structure Contains hexagonal liquid crystal structure No hexagonal liquid crystal structure No hexagonal liquid crystal structure No hexagonal liquid crystal structure No hexagonal liquid crystal structure No hexagonal liquid crystal structure No hexagonal liquid crystal structure SAXS testing Hexagonal liquid crystal characteristic peak Hexagonal liquid crystal characteristic peak Hexagonal liquid crystal characteristic peak Hexagonal liquid crystal characteristic peak Showing irregular scattering peaks Showing irregular scattering peaks Showing irregular scattering peaks Showing irregular scattering peaks Showing irregular scattering peaks Showing irregular scattering peaks Analysis Table 3 and Figure 1-6 It can be seen that: (1) Examples 1-4 of the present invention can successfully prepare transparent to nearly transparent gel samples, which do not flow at room temperature; and after 30 days of stability test at 48°C and -10°C, there is no difference in the appearance of the properties. In contrast, Comparative Examples 1-6 cannot successfully prepare transparent gel samples, and even some comparative example samples show phase separation after preparation. Considering that in actual production applications, cleansing products need to be used in high temperature scenes in summer, products with practical application value should at least meet the requirements of maintaining their gel properties at 35°C. The present invention allows the products provided by Examples 1-4 and Comparative Examples 1-6 to stand at 35°C for 30 minutes, and then observes their flow state at 35°C (such as Figure 1 and Figure 2 ). Figure 1 and Figure 2 As shown, the examples all meet this requirement; however, the comparative examples cannot meet the requirement of no flow at 35°C and have no practical production significance and value. Therefore, the above comparative examples can prove the uniqueness of the surfactant compound of the present invention.

[0058] (2) Hexagonal liquid crystals are anisotropic, unlike the isotropy of ordinary micelles. Therefore, they can show characteristic fan-shaped patterns under a polarizing microscope. On the contrary, isotropic substances do not have bright images under a polarizing microscope. The present invention uses a polarizing microscope to determine the presence of hexagonal liquid crystals. The present invention conducted polarizing microscope image inspections on the products provided in Examples 1-4 at 25°C. The results are as follows: Figure 3 As shown in the image data, it can be seen that Examples 1-4 all contain anisotropic polarized properties and overlapping sector-shaped polarized images of hexagonal liquid crystals, which proves that the samples of Examples 1-4 contain a large amount of hexagonal liquid crystals. However, Comparative Examples 1-6 contain almost no polarized images (such as Figure 4 ), indicating that anisotropic structures such as hexagonal liquid crystals are unlikely to exist in these samples.

[0059] (3) X-ray scattering is an important method for characterizing the aggregation state of surfactants. The liquid crystal structure and α-gel structure formed by surfactants are almost all ordered structures at the nanometer level. They cannot be fully confirmed by the naked eye alone and are usually measured with the help of X-ray scattering experiments. According to the Bragg formula and crystal plane calculation, the scattering vector q of the long crystal plane spacing of hexagonal liquid crystals will show q1:q2:q3=1: : These data are usually reflected in the small-angle X-ray scattering (SAXS) spectrum.

[0060] Through the high temperature and low temperature stability test and polarizing microscope observation test, it can be almost confirmed that comparative examples 1-6 do not have a hexagonal liquid crystal structure, and comparative example 6 shows phase separation such as delamination. Therefore, in this part of the present invention, only the samples of Examples 1-4 and Comparative Examples 1-5 are subjected to SAXS test to further confirm that they are hexagonal liquid crystal phases. Figure 5 As shown, Examples 1-4 all exhibit characteristic peaks of hexagonal liquid crystals. However, due to slight differences in the components between different Examples, the scattering vector peaks are slightly different and fluctuate, but this does not affect the conclusion that they should be judged as hexagonal liquid crystals. Figure 6 , Comparative Examples 1-5 all exhibit irregular scattering peaks, which do not conform to the characteristics of a hexagonal liquid crystal phase. Figure 5 and Figure 6 The spectral data displayed can confirm that the dominant phase in the samples of Examples 1-4 is hexagonal liquid crystal. However, it is difficult to successfully prepare hexagonal liquid crystal gel that meets the requirements when the component ratio exceeds the range claimed in the present invention, which shows that the present invention is unique.

[0061] 7. Cleaning performance evaluation Cleansing performance is an important parameter for evaluating the dosage form of cleansing products. In the present invention, 40 mg of the dirt model sample (formula see Table 4) is evenly applied to the skin of a healthy volunteer's cheek in an area of ​​2 cm × 2 cm, and dried at room temperature for 30 minutes. Then, 1.5 g of the test reference sample - a commercially available paste-type amino acid cleanser product, 1.5 g of a 30% SDS (sodium lauryl sulfate) aqueous solution, and 1.5 g of each of the samples of Example 1, Example 2, Example 3, and Example 4 of the present invention are taken and massaged on the test area for 1 minute (simulating daily cleaning scenarios), and then rinsed with running water for 30 seconds. Next, a colorimeter is used to test the color difference between the skin before and after smearing the model dirt on the smeared area. (The color difference calculation formula is ; Chromaticity value of the skin before and after cleaning the test area , calculate and evaluate its facial cleansing ability The smaller the P value, the better the product's cleansing ability. Each sample was tested three times, and the arithmetic mean was calculated. The evaluation results are shown in Table 5. The results show that the cleaning abilities of Examples 1-4 of the present invention outperformed commercially available amino acid cream-forming cleansing products, approaching the cleansing ability of a 30% SDS solution, demonstrating excellent facial cleansing performance.

[0062] Table 4

[0063] Table 5 Sample name Commercially available cream-forming amino acid cleansing products 30% SDS (sodium dodecyl sulfate) aqueous solution Example 1 Example 2 Example 3 Example 4 Dirt residual rate value (P) 4.13% 1.28% 2.11% 1.98% 1.62% 1.46% In summary, the amino acid cleansing gel prepared according to the composition and process described in the present invention is composed of hexagonal liquid crystals and has excellent high and low temperature stability and cleaning performance.

Claims

1. A hexagonal liquid crystal cleansing gel, characterized in that: Calculated by mass percentage, it includes at least the following components: Phase A: sodium lauroyl sarcosine 20-26%, auxiliary surfactant 0-1.5%; Phase B: Propylene glycol laurate 3-8%; Phase C: Glyceryl Laurate 0.01-4.5%; Phase D: Polyglyceryl-2 Laurate 1-5%; Additives: 0-2%; Deionized water: Make up the balance.

2. The hexagonal liquid crystal cleansing gel according to claim 1, characterized in that The auxiliary surfactant is selected from at least one of butylene glycol laurate, sodium methyl lauroyl taurate, lauryl glucoside or potassium cocoyl glycinate.

3. The hexagonal liquid crystal cleansing gel according to claim 2, characterized in that The auxiliary surfactant is selected from butylene glycol laurate or sodium methyl lauroyl taurate.

4. The hexagonal liquid crystal cleansing gel according to claim 1, characterized in that The addition amount of the sodium lauroyl sarcosine is 21-25 wt %.

5. The hexagonal liquid crystal cleansing gel according to claim 1, characterized in that The auxiliary agents at least include preservatives and pigments.

6. The hexagonal liquid crystal cleansing gel according to claim 5, characterized in that The amount of the preservative added is 0.1-1 wt %.

7. The hexagonal liquid crystal cleansing gel according to claim 5, characterized in that The preservative is selected from at least one of methylparaben, ethylparaben, p-hydroxyacetophenone or 1,2-hexanediol.

8. The hexagonal liquid crystal cleansing gel according to claim 5, characterized in that The added amount of the pigment is 0.001-0.01 wt %.

9. The hexagonal liquid crystal cleansing gel according to claim 1, characterized in that The hexagonal liquid crystal cleansing gel further comprises an active ingredient.

10. A method for preparing the hexagonal liquid crystal cleansing gel according to any one of claims 1 to 8, characterized in that: Mix the raw materials of phase A to prepare phase A; mix phase B, phase C and phase D to obtain a mixed liquid; add the mixed liquid to phase A to obtain a hexagonal liquid crystal gel system; add additives and deionized water to the hexagonal liquid crystal gel system and stir and mix.

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