Whitening and cleansing composition and preparation method thereof

Abstract

The invention discloses a whitening and cleansing composition and a preparation method thereof. The whitening and cleansing composition is prepared from the following components: 15 to 23 parts of a surfactant, 3.5 to 6.5 parts of a whitening active agent, 1.3 to 3.8 parts of an antioxidant, 7.5 to 15.5 parts of a humectant, 0.15 to 0.65 part of a stabilizer, 0.01 to 0.05 part of a pH (Potential of Hydrogen) regulator and 0.8 to 1.2 parts of a preservative. The antioxidant contains a characteristic compound; through component compounding, the stability and efficiency of an anti-oxidation system in the cleansing composition are effectively improved, and the retention rate of active components is remarkably increased. Meanwhile, the compatibility of all the components in the system is optimized, so that the cleaning process and the skin care effect do not interfere with each other, the multiple effects of mild cleaning, deep whitening and barrier protection are synergistically achieved, and the balance of the cleaning power and the skin care effect is achieved.

Description

Technical Field

[0001] This invention relates to the field of facial cleansing product technology, and in particular to a whitening facial cleansing composition and its preparation method. Background Technology

[0002] Currently, there is a surge in demand for facial cleansers that combine cleansing and whitening effects. However, problems such as dull skin and pigmentation are often related to free radical damage and improper cleansing. Existing whitening cleansers often focus on surface cleansing or add a single whitening ingredient, neglecting the synergistic effect of anti-oxidation, cleansing, and whitening. Free radical buildup accelerates melanin deposition and damages the skin barrier, while ordinary cleansers may exacerbate barrier damage due to excessive cleansing power, or lose efficacy due to poor stability and insufficient compatibility of antioxidants.

[0003] Commonly used antioxidants, such as vitamin C derivatives and coenzyme Q10, are easily oxidized and degraded in the water-based system of facial cleansers. Furthermore, their activity is easily reduced when combined with surfactants, making it difficult to fully exert their effects of scavenging free radicals and assisting in whitening.

[0004] Therefore, developing a facial cleanser that combines a stable compound of antioxidants with gentle cleansing, high-efficiency antioxidant and whitening effects has become the key to overcoming existing technological bottlenecks. Summary of the Invention

[0005] In view of this, this application provides a whitening facial cleansing composition and its preparation method, which is used to solve the problem of how to improve the overall performance of facial cleansing products.

[0006] To achieve the above technical objectives, this application adopts the following technical solution: In a first aspect, this application provides a whitening facial cleansing composition comprising the following components: 15-23 parts surfactant, 3.5-6.5 parts whitening active agent, 1.3-3.8 parts antioxidant, 7.5-15.5 parts moisturizer, 0.15-0.65 parts stabilizer, 0.01-0.05 parts pH adjuster, and 0.8-1.2 parts preservative; the antioxidant contains a characteristic compound, the structural formula of which is shown in Formula I: , Formula I.

[0007] Preferably, the surfactant comprises 10-15 parts of sodium lauroyl glutamate and 5-8 parts of cocamidopropyl betaine.

[0008] Preferably, the whitening active agent includes 3-5 parts nicotinamide and 0.5-1.5 parts glycyrrhizin.

[0009] Preferably, the antioxidant comprises 1-3 parts of magnesium vitamin C phosphate and 0.3-0.8 parts of the characteristic compound.

[0010] Preferably, the moisturizer includes 5-10 parts glycerin, 0.5-1.5 parts panthenol and 2-4 parts propylene glycol.

[0011] Preferably, the stabilizer includes 0.1-0.5 parts xanthan gum and 0.05-0.15 parts disodium EDTA.

[0012] Preferably, the pH adjuster is citric acid.

[0013] Preferably, the preservative is phenoxyethanol.

[0014] Secondly, this application provides a method for preparing a whitening facial cleansing composition, comprising the following steps: S1. Dissolve the stabilizer, glycerol and propylene glycol in hot water to obtain an aqueous solution; S2. Add the surfactant to the aqueous solution and heat to emulsify, thus obtaining the emulsion; S3. Cool the emulsion, and then add the whitening surfactant, antioxidant and panthenol in sequence to obtain a mixture; S4. Continue to cool the mixture, then add preservatives and pH adjusters, and allow it to stand to defoam, thus obtaining the whitening facial cleansing composition.

[0015] Preferably, in step S1, the temperature of the hot water is 70-75°C; in step S2, the temperature of the heating emulsification is 70-75°C; in step S3, the emulsion is cooled to 45-50°C; and in step S4, the mixture is further cooled to 35-40°C.

[0016] The beneficial effects of this application are as follows: This application, through ingredient blending, effectively enhances the stability and efficacy of the antioxidant system in the cleansing composition and significantly improves the retention rate of active ingredients. Simultaneously, this application optimizes the compatibility of the various components in the system, ensuring that the cleansing process and skincare effects do not interfere with each other, thereby synergistically achieving multiple benefits of gentle cleansing, deep whitening, and barrier protection, achieving a balance between cleansing power and skincare effects. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0018] The inventors discovered that existing facial cleansing systems have the following drawbacks: Insufficient stability of antioxidants in cleansing systems: The formulation environment of water-based cleansing products is prone to oxidative degradation of commonly used antioxidants such as vitamin C derivatives and coenzyme Q10. Their active ingredients are rapidly lost during product storage and use, and cannot continuously play their role in scavenging free radicals.

[0019] Poor compatibility between antioxidants and compound ingredients: When antioxidants are compounded with surfactants in facial cleansing products, they are prone to interaction, which leads to reduced activity. This not only affects the antioxidant effect but may also interfere with the cleaning performance of the surfactants, making it difficult to achieve a synergistic effect between antioxidant and cleaning functions.

[0020] The synergistic effect of cleansing, whitening and anti-oxidation is unbalanced: existing products either damage the skin barrier due to excessive cleansing power, exacerbating the damage of free radicals to the skin; or they lack an effective antioxidant mechanism, relying only on a single whitening ingredient, which cannot inhibit the melanin deposition mediated by free radicals from the source, making it difficult to achieve the synergistic effect of gentle cleansing and effective whitening and anti-oxidation.

[0021] Based on this, this application was created.

[0022] This application provides a whitening facial cleansing composition comprising the following components: 15-23 parts surfactant, 3.5-6.5 parts whitening active agent, 1.3-3.8 parts antioxidant, 7.5-15.5 parts moisturizer, 0.15-0.65 parts stabilizer, 0.01-0.05 parts pH adjuster, and 0.8-1.2 parts preservative; the antioxidant contains a characteristic compound, the structural formula of which is shown in Formula I. , Formula I.

[0023] This application, through ingredient blending, effectively enhances the stability and efficacy of the antioxidant system in the cleansing composition and significantly improves the retention rate of active ingredients. Simultaneously, this application optimizes the compatibility of the various components in the system, ensuring that the cleansing process and skincare effects do not interfere with each other, thereby synergistically achieving multiple benefits of gentle cleansing, deep whitening, and barrier protection, achieving a balance between cleansing power and skincare effects.

[0024] The CAS number of the characteristic compound in this application is 426219-32-1. In terms of its characteristic functional groups, the compound contains hydroxyl, imino, and aromatic ring structures. The hydroxyl and imino groups enhance water solubility and polarity, while the aromatic ring structure improves lipid solubility, resulting in better dispersibility in water-based cleansing systems and reduced oxidative degradation. Functionally, the characteristic compound exhibits synergistic effects with other substances: it forms a synergistic antioxidant network with antioxidants, stabilizing and enhancing the antioxidant system, thus increasing the retention rate of antioxidant components during storage and use; it has good compatibility with surfactants and whitening agents, ensuring no interference between cleansing function and efficacy; it promotes the dissolution and dispersion of whitening ingredients, achieving compatibility between whitening and other effects; and it synergistically enhances the overall stability of the product and extends its shelf life with stabilizers.

[0025] In some embodiments, the surfactant comprises 10-15 parts of sodium lauroyl glutamate and 5-8 parts of cocamidopropyl betaine.

[0026] In this embodiment, sodium lauroyl glutamate, as a mild amino acid surfactant, cleanses while protecting the skin barrier; cocamidopropyl betaine, as an amphoteric surfactant, enhances cleansing power and reduces irritation; in addition, the structural characteristics of the characteristic compound ensure that it does not have adverse interactions with surfactants such as sodium lauroyl glutamate and cocamidopropyl betaine, and will not reduce the emulsifying and cleansing properties of the surfactant.

[0027] In some embodiments, the skin-whitening active agent includes 3-5 parts nicotinamide and 0.5-1.5 parts glycyrrhizin.

[0028] In this embodiment, niacinamide inhibits melanin transport and has both oil-controlling and barrier-repairing effects; glycyrrhizin, as a natural whitening ingredient, inhibits tyrosinase activity and reduces irritation; at the same time, the characteristic compound can promote the dissolution and dispersion of whitening ingredients such as niacinamide and glycyrrhizin, avoiding the loss of efficacy caused by ingredient aggregation, and achieving highly efficient compatibility of antioxidant, whitening and cleansing ingredients.

[0029] In some embodiments, the antioxidant comprises 1-3 parts magnesium vitamin C phosphate and 0.3-0.8 parts of the characteristic compound.

[0030] In this embodiment, magnesium vitamin C phosphate, as a stable vitamin C derivative, has antioxidant properties and inhibits melanin production. The characteristic compound is used for synergistic antioxidant activity, scavenging free radicals and helping to brighten skin tone. In addition, the characteristic compound and magnesium vitamin C phosphate form a synergistic antioxidant network. The two complement each other through electron transfer, which not only inhibits the oxidative inactivation of magnesium vitamin C phosphate, but also enhances the free radical scavenging ability with the aromatic ring conjugated structure of the characteristic compound. This increases the retention rate of antioxidant active ingredients by more than 30% during storage and use, allowing them to continue to play a role.

[0031] In some embodiments, the moisturizer comprises 5-10 parts glycerin, 0.5-1.5 parts panthenol, and 2-4 parts propylene glycol.

[0032] In this embodiment, glycerin acts as a polyol moisturizer to maintain skin hydration; panthenol is used to repair the skin barrier and enhance skin tolerance; and propylene glycol is used to assist in moisturizing and improve the solubility of the ingredients.

[0033] In some embodiments, the stabilizer includes 0.1-0.5 parts xanthan gum and 0.05-0.15 parts disodium EDTA.

[0034] In this embodiment, xanthan gum is used as a thickening and stabilizing agent to improve the product's skin feel; disodium EDTA is used as a chelating agent to enhance product stability; the characteristic compounds work synergistically with the stabilizing system (xanthan gum, disodium EDTA) to improve the overall stability of the product, avoid problems such as layering and discoloration, and extend the shelf life to more than 24 months.

[0035] In some embodiments, the pH adjuster is citric acid.

[0036] In this embodiment, citric acid is used to adjust the product's pH to 5.5-6.5, matching the skin's acid-base environment.

[0037] In some embodiments, the preservative is phenoxyethanol.

[0038] In this embodiment, phenoxyethanol is used as a safe preservative to extend the product's shelf life.

[0039] This application also achieves a synergistic balance of efficacy, combining gentle cleansing, deep whitening, and barrier protection. Specifically, the combination of amino acids and amphoteric surfactants gently removes dirt while avoiding barrier damage, resolving the imbalance between cleansing power and gentleness in existing products. Through a triple mechanism of "inhibiting melanin production (glycyrrhizin, magnesium vitamin C phosphate), blocking melanin transport (niacinamide), and scavenging free radicals (characteristic compounds + magnesium vitamin C phosphate)," it improves dullness and pigmentation from the source, with whitening efficiency more than 40% higher than single-ingredient products. Panthenol, glycerin, and other ingredients work synergistically with the antioxidant system to reduce free radical damage to the skin, while repairing the damaged barrier and improving skin tolerance, making it suitable for sensitive skin.

[0040] This application provides a method for preparing a whitening facial cleanser composition, comprising the following steps: S1. Dissolve the stabilizer, glycerol and propylene glycol in hot water to obtain an aqueous solution; S2. Add the surfactant to the aqueous solution and heat to emulsify, thus obtaining the emulsion; S3. Cool the emulsion, and then add the whitening surfactant, antioxidant and panthenol in sequence to obtain a mixture; S4. Continue to cool the mixture, then add preservatives and pH adjusters, and allow it to stand to defoam, thus obtaining the whitening facial cleansing composition.

[0041] The ingredients are evenly dissolved during the preparation process of this application, the finished product has a delicate texture, moderate foaming properties, and leaves no residue after rinsing. It has both a refreshing and moisturizing feel, enhancing the user experience.

[0042] In some embodiments, in step S1, the temperature of the hot water is 70-75°C; in step S2, the temperature of the heating emulsification is 70-75°C; in step S3, the emulsion is cooled to 45-50°C; and in step S4, the mixture is further cooled to 35-40°C.

[0043] The following specific embodiments further illustrate this solution.

[0044] Example 1 A whitening facial cleansing composition comprising the following components: 12 parts sodium lauroyl glutamate, 6.5 parts cocamidopropyl betaine, 4 parts nicotinamide, 1 part glycyrrhizin, 2 parts magnesium vitamin C phosphate, 0.5 parts characteristic compound, 7.5 parts glycerin, 1 part panthenol, 3 parts propylene glycol, 0.3 parts xanthan gum, 0.1 parts disodium EDTA, 0.03 parts citric acid, 1 part phenoxyethanol; 61.07 parts deionized water; the structural formula of the characteristic compound (CAS 426219-32-1) is shown in Formula I: , Formula I.

[0045] A method for preparing a whitening facial cleansing composition includes the following steps: S1. Add 61.07 parts of deionized water to the reactor, heat to 72°C, and then add 7.5 parts of glycerol, 3 parts of propylene glycol, 0.3 parts of xanthan gum, and 0.1 parts of disodium EDTA in sequence. Stir until completely dissolved, and then keep warm and stir for 18 minutes to obtain a homogeneous aqueous solution. S2. Add 12 parts of sodium lauroyl glutamate and 6.5 parts of cocamidopropyl betaine to the aqueous phase solution, maintain 72℃ and stir for 22 min until the system is emulsified and homogeneous to obtain the emulsion; S3. Cool the emulsion to 48°C, then add 4 parts nicotinamide, 1 part glycyrrhizin, 2 parts magnesium vitamin C phosphate, 0.5 parts characteristic compound and 1 part panthenol in sequence. Stir for 12 minutes after each component is added to ensure complete dissolution and obtain a mixture. S4. Continue cooling the mixture to 38°C, then add 1 part phenoxyethanol and 0.03 parts citric acid, stir for 10 minutes, and check that the pH is 5.8. Stop stirring, let stand for 30 minutes to degas, and check that there is no stratification or odor. Discharge and fill to obtain the whitening facial cleansing composition.

[0046] Example 2 A whitening facial cleansing composition comprising the following components: 13 parts sodium lauroyl glutamate, 7 parts cocamidopropyl betaine, 5 parts niacinamide, 1.5 parts glycyrrhizin, 2.5 parts magnesium vitamin C phosphate, 0.7 parts characteristic compound, 8.0 parts glycerin, 1.2 parts panthenol, 3.5 parts propylene glycol, 0.4 parts xanthan gum, 0.12 parts disodium EDTA, 0.04 parts citric acid, 1.1 parts phenoxyethanol; 56.94 parts deionized water; the structural formula of the characteristic compound (CAS 426219-32-1) is shown in Formula I: , Formula I.

[0047] A method for preparing a whitening facial cleansing composition includes the following steps: S1. Add 56.94 parts of deionized water to the reactor, heat to 73°C, and then add 8 parts of glycerol, 3.5 parts of propylene glycol, 0.4 parts of xanthan gum, and 0.12 parts of disodium EDTA in sequence. Stir until completely dissolved, and then keep warm and stir for 17 minutes to obtain a homogeneous aqueous solution. S2. Add 13 parts of sodium lauroyl glutamate and 7 parts of cocamidopropyl betaine to the aqueous phase solution, maintain 73℃ and stir for 23 min until the system is emulsified and homogeneous to obtain the emulsion; S3. Cool the emulsion to 49°C, and then add 5.0 parts of nicotinamide, 1.5 parts of glycyrrhizin, 2.5 parts of magnesium vitamin C phosphate, 0.7 parts of the characteristic compound and 1.2 parts of panthenol in sequence. Stir for 13 minutes after each component is added to ensure complete dissolution and obtain a mixture. S4. Continue cooling the mixture to 39°C, then add 1.1 parts phenoxyethanol and 0.04 parts citric acid, stir for 10 minutes, check the pH to be 6.0, stop stirring, let stand for 30 minutes to degas, and check for no stratification and no odor. Discharge and fill to obtain the whitening facial cleansing composition.

[0048] Example 3 A whitening facial cleansing composition comprising the following components: 11 parts sodium lauroyl glutamate, 6 parts cocamidopropyl betaine, 3.5 parts nicotinamide, 0.8 parts glycyrrhizin, 3.0 parts magnesium vitamin C phosphate, 0.8 parts characteristic compound, 9.0 parts glycerin, 1.5 parts panthenol, 2.5 parts propylene glycol, 0.2 parts xanthan gum, 0.08 parts disodium EDTA, 0.02 parts citric acid, 0.9 parts phenoxyethanol; 60.7 parts deionized water; the structural formula of the characteristic compound (CAS 426219-32-1) is shown in Formula I: , Formula I.

[0049] A method for preparing a whitening facial cleansing composition includes the following steps: S1. Add 60.7 parts of deionized water to the reactor, heat to 71°C, and then add 9.0 parts of glycerol, 2.5 parts of propylene glycol, 0.2 parts of xanthan gum, and 0.08 parts of disodium EDTA in sequence. Stir until completely dissolved, and then keep warm and stir for 19 min to obtain a homogeneous aqueous solution. S2. Add 11 parts of sodium lauroyl glutamate and 6.0 parts of cocamidopropyl betaine to the aqueous phase solution, maintain 71℃ and stir for 21 min until the system is emulsified and homogeneous to obtain the emulsion; S3. Cool the emulsion to 46°C, and then add 3.5 parts nicotinamide, 0.8 parts glycyrrhizin, 3.0 parts magnesium vitamin C phosphate, 0.8 parts characteristic compound and 1.5 parts panthenol in sequence. Stir for 14 minutes after each addition to ensure complete dissolution and obtain a mixture. S4. Continue cooling the mixture to 36°C, then add 0.9 parts phenoxyethanol and 0.02 parts citric acid, stir for 10 minutes, and check that the pH is 5.6. Stop stirring, let stand for 30 minutes to degas, and check that there is no stratification or odor. Discharge and fill to obtain the whitening facial cleansing composition.

[0050] Example 4 A whitening facial cleansing composition comprising the following components: 10 parts sodium lauroyl glutamate, 5 parts cocamidopropyl betaine, 3 parts nicotinamide, 0.5 parts glycyrrhizin, 1.0 part magnesium vitamin C phosphate, 0.3 parts characteristic compound, 10 parts glycerin, 1.5 parts panthenol, 4 parts propylene glycol, 0.5 parts xanthan gum, 0.15 parts disodium EDTA, 0.05 parts citric acid, 0.8 parts phenoxyethanol; 63.2 parts deionized water; the structural formula of the characteristic compound (CAS 426219-32-1) is shown in Formula I: , Formula I.

[0051] A method for preparing a whitening facial cleansing composition includes the following steps: S1. Add 63.2 parts of deionized water to the reactor, heat to 74℃, and add 10 parts of glycerol, 4 parts of propylene glycol, 0.5 parts of xanthan gum, and 0.15 parts of disodium EDTA in sequence. Stir until completely dissolved, and keep warm and stir for 20 min to obtain a homogeneous aqueous solution. S2. Add 10 parts of sodium lauroyl glutamate and 5 parts of cocamidopropyl betaine to the aqueous phase solution, maintain 74℃ and stir for 25 min until the system is emulsified and homogeneous to obtain the emulsion; S3. Cool the emulsion to 45°C, then add 3 parts nicotinamide, 0.5 parts glycyrrhizin, 1.0 part magnesium vitamin C phosphate, 0.3 parts characteristic compound and 1.5 parts panthenol in sequence. Stir for 15 minutes after each addition to ensure complete dissolution and obtain a mixture. S4. Continue cooling the mixture to 40°C, then add 0.8 parts phenoxyethanol and 0.05 parts citric acid, stir for 10 minutes, and check that the pH is 6.2. Stop stirring, let stand for 30 minutes to degas, and check that there is no stratification or odor. Discharge and fill to obtain the whitening facial cleansing composition.

[0052] Comparative Example 1 A whitening facial cleansing composition is otherwise identical to that of Example 1, except that it does not include the characteristic compound and the amount of deionized water is 61.57 parts.

[0053] Comparative Example 2 A whitening facial cleansing composition is identical to that in Example 1, except that sodium lauroyl glutamate and cocamidopropyl betaine in Example 1 are replaced with an equal amount of sodium laurylate, and the amount of citric acid is 0.05 parts.

[0054] Testing and Evaluation The effects of different embodiments and comparative examples were tested, as follows: I. Antioxidant Performance Test 1. Initial free radical scavenging rate determination Take samples from each example and Comparative Example 1 (missing characteristic compound), dilute them with deionized water to a concentration of 5%, and prepare test solutions.

[0055] The DPPH method and ABTS method were used respectively: 2 mL of test solution was mixed with 2 mL of DPPH / ABTS solution, and the mixture was reacted in the dark for 30 min. The absorbance at 517 nm (DPPH) or 734 nm (ABTS) was measured, and the free radical scavenging rate was calculated.

[0056] 2. Determination of active ingredient retention rate Sample grouping: After sealing, the samples of each embodiment and Comparative Example 1 were placed in a constant temperature and humidity chamber (45℃, RH75%) for accelerated storage for 3 months, while a control group was set up for storage at room temperature (25℃).

[0057] HPLC detection: Magnesium phosphate of vitamin C and characteristic compounds were extracted from the samples before and after storage, respectively, and quantified using the standard curve method. The retention rate was calculated as (content after storage / initial content × 100%).

[0058] The results are shown in Table 1.

[0059] Table 1. Results of Antioxidant Performance Tests

[0060] The purpose of the antioxidant performance test is to verify the synergistic effect of the antioxidant system (magnesium vitamin C phosphate and characteristic compounds), including the initial free radical scavenging efficiency and the retention rate of active ingredients after storage.

[0061] II. Whitening Performance Test 1. In vitro melanin inhibition rate assay (B16 cell experiment) Cell culture: B16 cells were seeded into 96-well plates and cultured for 24 hours. Then, half of the sample dilution buffer (2% concentration) of each example and comparative example was added, and the cells were cultured for another 48 hours.

[0062] Indicator detection: The melanin content and tyrosinase activity in cells were measured using a kit, and the inhibition rate was calculated as (blank group - sample group) / blank group × 100%.

[0063] The results are shown in Table 2.

[0064] Table 2 Whitening Performance Test Results

[0065] III. Cleaning Performance Test 1. Determination of detergency (QB / T4348-2012 method improvement) White cotton cloth pretreatment: Cut 10cm×10cm white cotton cloth, soak it in artificial dirt, dry it, and weigh it (W1).

[0066] Cleaning process: Soak the cotton cloth in 5% sample solution, shake and wash for 5 minutes, rinse 3 times with deionized water, dry and weigh (W2).

[0067] Calculate the decontamination rate: (W1-W2) / W1×100%.

[0068] The results are shown in Table 3.

[0069] Table 3 Cleaning performance test results

[0070] Example 1 is a basic balancing whitening facial cleanser with a balanced ratio of ingredients that takes into account the basic effects of cleansing, whitening and anti-oxidation. It is suitable for daily use on normal skin, has moderate foaming properties, and leaves the skin feeling refreshed and not tight after rinsing.

[0071] Example 2 is a high-whitening facial cleanser formula that strengthens melanin inhibition. Compared with Example 1, the proportion of niacinamide, glycyrrhizin and antioxidant ingredients in Example 2 is increased, and the synergistic effect of the three whitening mechanisms is enhanced, making it more effective for dull and pigmented skin, and the whitening efficiency is improved compared with Example 1.

[0072] Example 3 is a strong antioxidant facial cleanser formula that focuses on free radical scavenging. Compared with Example 1, the ratio of magnesium vitamin C phosphate to characteristic compounds in Example 3 reaches the maximum value, resulting in a stronger synergistic antioxidant network and improved retention rate of active ingredients compared with Example 1. It is suitable for skin that is exposed to pollution and ultraviolet radiation for a long time and can reduce free radical damage.

[0073] Example 4 is a gentle moisturizing facial cleanser formula suitable for sensitive skin. Compared to Example 1, Example 4 has a minimum proportion of surfactants and an increased proportion of moisturizing and repairing ingredients such as glycerin and panthenol. It is gentle and non-irritating, while retaining basic whitening and antioxidant effects. It is suitable for daily cleansing of sensitive and dry skin, and has a more prominent barrier repair effect.

[0074] Compared to Example 1, Comparative Example 1 lacks the characteristic compound; compared to Example 1, Comparative Example 2 replaces the surfactant in Example 1 with a conventional soap-based surfactant; it can be seen that the overall effect of the comparative examples is not as good as that of the examples of this application.

[0075] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A whitening facial cleansing composition, characterized in that, It comprises the following components: 15-23 parts surfactant, 3.5-6.5 parts whitening active agent, 1.3-3.8 parts antioxidant, 7.5-15.5 parts moisturizer, 0.15-0.65 parts stabilizer, 0.01-0.05 parts pH adjuster, and 0.8-1.2 parts preservative; the antioxidant contains a characteristic compound, the structural formula of which is shown in Formula I: , Formula I.

2. The whitening facial cleansing composition according to claim 1, characterized in that, The surfactant comprises 10-15 parts of sodium lauroyl glutamate and 5-8 parts of cocamidopropyl betaine.

3. The whitening facial cleansing composition according to claim 1, characterized in that, The whitening active agent includes 3-5 parts nicotinamide and 0.5-1.5 parts glycyrrhizin.

4. The whitening facial cleansing composition according to claim 1, characterized in that, The antioxidant comprises 1-3 parts of magnesium vitamin C phosphate and 0.3-0.8 parts of the characteristic compound.

5. The whitening facial cleansing composition according to claim 1, characterized in that, The moisturizer comprises 5-10 parts glycerin, 0.5-1.5 parts panthenol, and 2-4 parts propylene glycol.

6. The whitening facial cleansing composition according to claim 1, characterized in that, The stabilizer comprises 0.1-0.5 parts xanthan gum and 0.05-0.15 parts disodium EDTA.

7. The whitening facial cleansing composition according to claim 1, characterized in that, The pH adjuster is citric acid.

8. The whitening facial cleansing composition according to claim 1, characterized in that, The preservative is phenoxyethanol.

9. A method for preparing a whitening facial cleansing composition according to any one of claims 1-8, characterized in that, Includes the following steps: S1. Dissolve the stabilizer, glycerol and propylene glycol in hot water to obtain an aqueous solution; S2. Add the surfactant to the aqueous solution and heat to emulsify, thus obtaining the emulsion; S3. Cool the emulsion, and then add the whitening surfactant, antioxidant and panthenol in sequence to obtain a mixture; S4. Continue to cool the mixture, then add preservatives and pH adjusters, and allow it to stand to defoam, thus obtaining the whitening facial cleansing composition.

10. The preparation method according to claim 9, characterized in that, In step S1, the temperature of the hot water is 70-75℃; in step S2, the temperature of the heating emulsification is 70-75℃; in step S3, the emulsion is cooled to 45-50℃; in step S4, the mixture is further cooled to 35-40℃.

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