Water-encountering SPF (specific pathogen factor) value enhanced multi-sunscreen emulsion and preparation method thereof

Abstract

The invention relates to a water SPF value enhanced multiple sunscreen emulsion and a preparation method thereof. The emulsion is prepared from the following raw materials: a phase A, polyol, a thickening agent, sodium bis (lauroyl glutamine) lysine, disodium EDTA (Ethylene Diamine Tetraacetic Acid), a skin conditioner and the balance of water, the phase B is prepared from diethylaminohydroxybenzoyl hexyl benzoate, polysiloxane 15, ethylhexyl methoxycinnamate, octocrylene and ethylhexyl salicylate; the phase C comprises a sunscreen composition and a skin conditioner; wherein the ethylhexyl salicylate can be replaced by caprylic acid / capric triglyceride or diisopropyl sebacate; the preparation method of the emulsion comprises the following steps: heating and stirring the A-phase component into a transparent water-phase solution I, heating and melting the B-phase material, homogenizing at a high speed, mixing into the solution I, cooling, adding the C-phase, stirring, and finally filtering and discharging. The W / O / W multi-structure sunscreen emulsion prepared by using the hydrophilic emulsifier, the specific sunscreen component and the selected grease through a one-step method has the advantages of enhanced SPF when meeting water, fresh and cool skin feeling, easiness in coating and low irritation.

Description

Technical Field

[0001] The present application relates to the field of cosmetic technology, and more particularly to a water-based SPF-enhanced multi-sunscreen lotion and a preparation method thereof. Background Art

[0002] In recent years, the development trend of sunscreen products has focused on three core areas: improving water and sweat resistance, ensuring product safety and an effective SPF, and pursuing a refreshing and non-sticky feeling after use. From the perspective of dosage form, sunscreen products on the market are mainly divided into O / W (oil-in-water) and W / O (water-in-oil) types, each with its own characteristics and applicable populations.

[0003] O / W sunscreen emulsions are favored for their refreshing properties and are particularly suitable for consumers seeking a light skin feel. However, these products often lack water and sweat resistance, necessitating an increase in the amount of film-forming agents used to enhance the waterproofing effect. However, the addition of film-forming agents can create a sticky feel on the skin, sacrificing the original refreshing properties. In comparison, W / O sunscreen products are more likely to achieve a high SPF and excellent water and sweat resistance, making them particularly suitable for dry skin. However, a common drawback of these products is that they feel greasy, easily shine, and lack breathability.

[0004] In view of the above challenges, the industry urgently needs to develop a new type of sunscreen cosmetic that is waterproof and sweat-resistant, lightweight, safe and effective. Multiple emulsion technology provides a new idea for this. By constructing a unique "two-membrane three-phase" multi-compartment structure (such as O / W / O or W / O / W emulsions), this technology has shown significant advantages in optimizing skin feel, enhancing waterproof performance and reducing the irritation of chemical sunscreens. In particular, W / O / W emulsions, as a composite system of O / W and W / O emulsions, have greater potential in balancing skin feel and waterproofness.

[0005] Current research on the waterproof performance of sunscreen products in the market focuses on maintaining 70%-80% of the product's original waterproof ability, and research methods mostly concentrate on the addition of water-phase and oil-phase film-forming agents, and tend to prepare W / O emulsions. For example, Chinese patents CN117883300A and CN117598932A prepare W / O emulsions by adding film-forming agents to the water and oil phases and using inorganic sunscreens in combination with film-forming agents, respectively, to enhance waterproofness, but the skin feel is relatively thick and sticky. In addition, the SPF water-enhanced technology described in U.S. Patent US20170333301A1, although it can achieve enhanced waterproofness, has strict requirements on the UV sunscreen content, organic modified montmorillonite, the type of oil-phase thickener and the HLB value of the silicone oil emulsifier, and the resulting water-in-oil emulsion also feels greasy on the skin. Summary of the Invention

[0006] To address the numerous issues with existing sunscreen lotions, this application provides a water-activated SPF-enhanced multi-sunscreen lotion and its preparation method. This lotion's preparation utilizes only hydrophilic emulsifiers, a feature that reduces time and energy consumption throughout the entire process, significantly improving production efficiency and reducing costs. The resulting sunscreen lotion exhibits numerous advantages, including enhanced SPF upon contact with water, an excellent skin feel, a refreshing and pleasant after-application experience, low skin irritation, and effective UV protection.

[0007] In a first aspect, the present application provides a water-soluble SPF-enhanced multi-sunscreen lotion using the following technical solution: a water-soluble SPF-enhanced multi-sunscreen lotion, the raw materials used for its preparation comprising the following components, calculated by weight percentage: Phase A: 1-10% polyol, 0.1-1% thickener, 0.1-0.5% hydrophilic emulsifier, 0-0.03% disodium EDTA, 0-0.5% skin conditioner, and the balance water; Phase B: sunscreen 5-20%, emollient 0-10%; Phase C: sunscreen composition 0-3%, skin conditioner 0-0.3%; Wherein, the hydrophilic emulsifier in phase A is sodium di(lauroyl glutamine) lysine; The sunscreen in phase B is composed of two or more of polysilicone-15 and ethylhexyl methoxycinnamate, octocrylene, ethylhexyl salicylate, homosalate, ethylhexyl triazone, isopentyl 4-methoxycinnamate, diethylamino hydroxybenzoyl hexyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, and diethylhexyl butamido triazone; the emollient in phase B is selected from diisopropyl sebacate, C12-15 alcohol benzoate, butyloctanol salicylate, dicaprylyl carbonate, caprylic / capric triglyceride, propylene glycol dicaprylate / dicaprate, neopentyl glycol diheptanoate, dibutyl adipate, triethylhexanoin, isononyl isononanoate, isopropyl myristate, mineral oil, squalane, isohexadecane, polydimethylsiloxane, caprylyl polymethicone, phenyl trimethicone, jojoba (SIMMONDSIA One or more of: sunflower (Helianthus annuus) seed oil, meadowfoam (Limanthus alba) seed oil, and hydrogenated cottonseed oil; The sunscreen composition in phase C is composed of methylene bis-phenyltriazolyl tetramethylbutylphenol, water, decyl glucoside, butylene glycol and xanthan gum.

[0008] Furthermore, the raw materials used for preparation include the following components in percentage by weight: Phase A: polyol 1-10%, thickener 0.1-1%, sodium di(lauroyl glutamine) lysine 0.1-0.5%, disodium EDTA 0.03%, skin conditioner 0.35%, water as the balance; Phase B: Diethylamino Hydroxybenzoyl Hexyl Benzoate 1.0%, Polysilicone-15 0.5-2.0%, Ethylhexyl Methoxycinnamate 3.0-8.0%, Octocrylene 0.5-4.0%, Ethylhexyl Salicylate 1.5-5%; Phase C: sunscreen composition 3%, skin conditioner 0.3%.

[0009] Alternatively, the raw materials used in the preparation include the following components in percentage by weight: Phase A: polyol 1-10%, thickener 0.1-1%, sodium di(lauroyl glutamine) lysine 0.1-0.5%, disodium EDTA 0.03%, skin conditioner 0.35%, water as the balance; Phase B: Diethylamino Hydroxybenzoyl Hexyl Benzoate 1.0%, Polysilicone-15 0.5-2.0%, Ethylhexyl Methoxycinnamate 3.0-8.0%, Octocrylene 0.5-4.0%, Emollient 1.5-5%; Phase C: sunscreen composition 3%, skin conditioner 0.3%.

[0010] By adopting the above technical solution, only the hydrophilic emulsifier - sodium di(lauroyl glutamine) lysine, combined with the specific sunscreen agent polysilicone-15, was used. With the carefully selected oil types and proportions, a multi-sunscreen emulsion was successfully prepared. This emulsion has a W / O / W multiple structure and an SPF value enhancement effect when it comes into contact with water. It feels good on the skin, is refreshing and non-greasy, and is easy to spread. There is no need to introduce a lipophilic emulsifier, thus realizing the one-step preparation of a multi-structure emulsion.

[0011] Furthermore, the polyol in phase A is selected from one or more combinations of 1,3-propylene glycol, glycerol polyether-26, dipropylene glycol, butylene glycol, glycerol, and 1,2-hexanediol.

[0012] Furthermore, the thickener in phase A is selected from one or more combinations of ammonium acryloyldimethyl taurate / VP copolymer, xanthan gum, gum arabic, pectin, hydroxyethyl cellulose, acrylic acid (esters) / C10-30 alkyl acrylate crosspolymer, sodium polyacrylate, acrylic acid (esters) / vinyl isodecanoate crosspolymer, and ammonium polyacryloyldimethyl taurate.

[0013] Furthermore, the skin conditioning agent in phase A and phase C is selected from one or more combinations of p-hydroxyacetophenone, methylpropylene glycol, caprylhydroxamic acid, and glyceryl caprylate.

[0014] In a second aspect, the present application provides a method for preparing a water-soluble SPF-enhanced multi-sunscreen lotion using the following technical solution: A method for preparing a water-soluble SPF-enhanced multiple sunscreen lotion comprises the following steps: 1) Add all components of phase A to the aqueous phase pot, heat to 80-85°C, and continue stirring for 15-20 minutes until a uniform and transparent aqueous phase solution I is formed; 2) Simultaneously add all materials of Phase B to the oil phase pot and heat to 80-85°C. Stir evenly until completely melted. Then, pump Phase B into Solution I obtained in Step 1) and homogenize at 3000-4000 rpm for 4-5 minutes. Finally, stir and cool the system to 40°C. Add Phase C, stir evenly, and filter the material.

[0015] Furthermore, in step 2), a stepwise heating mode is adopted, that is, the temperature is raised by 5° C. every 5 minutes, the temperature is controlled to 80-85° C., and low-speed stirring is maintained at 200-300 rpm until it is completely melted.

[0016] By adopting the above technical solution, the above-mentioned emulsion can be prepared efficiently and stably. This preparation process is not only stable and reliable, but also very suitable for industrial production. The entire process is also time-saving and energy-consuming, thereby significantly improving production efficiency and effectively reducing production costs.

[0017] In summary, this application has the following beneficial technical effects: 1. This application uses a combination of the hydrophilic emulsifier sodium di(lauroyl glutamine) lysine and the specific sunscreen ingredient polysilicone-15. Based on specific oil types and their appropriate proportions, a sunscreen lotion with a W / O / W multi-structure has been successfully developed. This lotion not only has the characteristic of enhancing the SPF value after contact with water, but also has an excellent feel, a refreshing and non-greasy texture, and is easy to apply evenly. It reduces the irritation caused by high levels of chemical sunscreens and surfactants in contact with the skin, and effectively protects the skin from UV damage. 2. The preparation process of the present application is efficient and stable, and is very suitable for industrial production. The preparation process only uses hydrophilic emulsifiers, and no lipophilic emulsifiers need to be added to achieve one-step efficient preparation of multi-structure emulsions, making the entire preparation process shorter and more energy-efficient, significantly improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Attachment Figure 1 This is a microscopic image of the emulsion prepared in Example 1 of the present application; Attachment Figure 2 UV images of the front of the upper arm before and after immersion in water in a human body experiment of the emulsions prepared in Example 1 and Comparative Example 2 of the present application, and a bar graph of the average sun protection index before and after immersion in water in an in vitro experiment; Attachment Figure 3Microscope images of the emulsions prepared in Examples 2-5 of the present application; Attachment Figure 4 Microscope images of the emulsions prepared in Examples 6-9 of the present application; Attachment Figure 5 This is a microscopic image of the emulsion prepared in Comparative Example 1-2 of the present application; Attachment Figure 6 These are microscopic images of the emulsions prepared in Examples 10-15 of the present application. DETAILED DESCRIPTION

[0019] To more clearly illustrate the present invention, the present invention is further described below in conjunction with preferred embodiments. It should be understood that the embodiments described are only a portion of the present invention, not all of the embodiments. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0020] The purpose of the present invention is illustrated by the following examples. The components of the composition are illustrated in parts by weight as a general standard. Unless otherwise specified, for the sake of simplicity, the "parts" described in the examples of the present invention have the same meaning as parts by weight.

[0021] Unless otherwise specified, all reagents and instruments used were commercially available.

[0022] Performance testing 1. Observation of Emulsion Structure The emulsion samples prepared in each example and comparative example were observed under a microscope to see whether they were W / O / W systems, in order to evaluate the molding quality of the emulsion and the structure of the multiple emulsion.

[0023] 2. SPF water enhancement test 1. Human body method test Ultraviolet-induced fluorescence imaging: Under ultraviolet irradiation, advanced glycation end products in human skin emit fluorescence in the blue-green spectral region. The area where the sample is applied appears as a dark area due to the absorption of ultraviolet rays by the sunscreen. Take the same weight of sunscreen lotion sample and apply it on the front of the upper arm, ensuring that the amount used is 2mg / cm 2 The water resistance of cosmetics was evaluated by observing the image of human forearm skin before applying the sample, the image of the skin after the sample was applied and dried for 5 minutes, and the image of the skin after being immersed in running water for 20 minutes and then dried at room temperature. The darker the dark area, the more sunscreen remained on the skin after rinsing, and the better the water resistance.

[0024] 2. In vitro test method PMMA plate was used as the carrier, and the sample application amount was 2 mg / cm 2 , then put on the fingertip and apply it. The application time is controlled between 30s-60s. After application, place it in a place without direct light at room temperature to dry and balance for 20 minutes. Then fix the sample on the bracket and use a stirrer (150rpm) in a 10L constant temperature water bath to simulate the activities of the human test person in the bathtub. Measure the SPF value of the carrier before immersion in water and after immersion in water for 40 minutes to compare the difference in water resistance.

[0025] Example 1 A multi-sunscreen lotion with enhanced SPF value when in contact with water, the raw materials used in its preparation are shown in the table below.

[0026] The above-mentioned water-soluble SPF-enhanced multi-sunscreen lotion is prepared by the following preparation method: 1) Add all components of phase A to the aqueous phase pot, heat to 80-85°C, and continue stirring for 15-20 minutes until a uniform and transparent aqueous phase solution I is formed; 2) Add all materials of phase B into the oil phase pot simultaneously, adopt step-by-step heating mode, that is, increase the temperature by 5°C every 5 minutes, control the temperature to 80-85°C, maintain low speed stirring at 200-300 rpm until completely melted, Then, phase B was pumped into solution I obtained in step 1) and homogenized at 3000-4000 rpm for 4-5 minutes; finally, the system was stirred and cooled to 40°C, phase C was added, stirred evenly, and the material was filtered.

[0027] Comparative Example 1 A multi-sunscreen lotion with enhanced SPF value when exposed to water is prepared by a method substantially the same as in Example 1, the only difference from Example 1 being that the hydrophilic emulsifier sodium di(lauroyl glutamine) lysine is not present in raw material phase A, and the general emulsifier glyceryl stearate citrate is added to phase B. The specific raw materials used in the preparation are shown in the table below.

[0028] Comparative Example 2 A multi-sunscreen emulsion with enhanced SPF value when exposed to water is prepared by a method substantially the same as in Example 1, the only difference from Example 1 being that the hydrophilic emulsifier sodium di(lauroyl glutamine) lysine is not present in the raw material phase A, and the lipophilic emulsifier cetyl PEG / PPG-10 / 1 polydimethylsiloxane is added to phase B. The specific raw materials used in the preparation are shown in the table below.

[0029] The performance test analysis of the emulsion samples prepared in Example 1 and Comparative Examples 1-2 was performed with reference to the aforementioned performance test. Here, only the SPF water-enhanced test was performed on Example 1 and Comparative Example 2. The test results are shown in the accompanying drawings and the table below.

[0030] Instructions attached Figure 2 a is the image of the human forearm skin before applying the sample, b is the image after the sample was applied and dried for 5 minutes, and c is the image of the skin after being immersed in flowing water for 20 minutes and then cooled at room temperature; Figure 2 It can be observed that the dark area of Example 1 is deeper than that of Comparative Example 2, which shows that the water resistance of Example 1 is stronger than that of Comparative Example 2; In the attached Figure 2 The bar chart showing the average SPF values before and after immersion in water in in vitro testing clearly shows that the multi-sunscreen lotion prepared in Example 1 exhibits a significant water-enhanced SPF effect. Specifically, the SPF value of the lotion increased by 7.6% after exposure to water. This increase demonstrates its excellent water resistance. In contrast, the SPF value of the corresponding W / O sunscreen formula (Comparative Example 2) dropped to 76% of its pre-immersion value after exposure to water, indicating its relatively weak water resistance. In addition, through the microscope pictures (see attached Figure 1 ) further observation, we can confirm that the emulsion system in Example 1 is a typical W / O / W (water-in-oil-in-water) multiple emulsion structure, which is not only complex but also of high quality. The microscope picture of the emulsion prepared in Comparative Example 1 (see attached Figure 5 ), indicating that the emulsion system is not a W / O / W multiple emulsion structure.

[0031] Examples 2-9 A multi-sunscreen lotion with enhanced SPF value when exposed to water is prepared by a method substantially similar to that of Example 1. The only difference from Example 1 is that the types and amounts of the components in the preparation raw materials are different. The specific details are shown in the table below.

[0032] The performance test was performed on the emulsion samples prepared in Examples 2-9 with reference to the aforementioned performance test. Here, only the emulsion system structure of Examples 2-9 was observed. The test results are shown in the accompanying drawings and the table below.

[0033] By analyzing the test results of the emulsion system structure of Examples 2 to 9 (combined with the attached Figure 3 and attached Figure 4 ), we can see that: except for Example 2, the emulsion systems prepared in the other examples all exhibited multiple structural characteristics of W / O / W (water-in-oil-in-water); By comprehensively comparing the test conditions of Examples 1 to 9 and Comparative Examples 1 and 2, we discovered a key formula combination: sodium di(lauroyl glutamine) lysine and polysilicone-15. This combination can prepare a multi-structured emulsion in a one-step process without relying on a lipophilic emulsifier. A deeper look into the reasons may be that sodium di(lauroyl glutamine) lysine has a lower critical micelle concentration, and its emulsification effect does not depend on the HLB value (hydrophile-lipophile balance). In the presence of polysilicone-15, this ingredient can be pulled into the interior of the oil droplets to form an inner water phase, which is a key step in constructing a W / O / W multiple structure. In addition, the sodium di(lauroyl glutamine) lysine molecule contains multiple hydrophilic and hydrophobic groups at the same time. This structural characteristic makes it have stronger interaction and compatibility with polysilicone-15. Therefore, they are more likely to form a stable inner water phase inside the oil droplets, thereby further promoting the formation of multiple structures.

[0034] Examples 10-15 A multi-sunscreen lotion with enhanced SPF value when exposed to water, the preparation method of which is basically the same as that of Example 1, the only difference from Example 1 is that the types and amounts of the components in the preparation raw materials are different. The performance test and analysis of the emulsion samples prepared in Examples 10-15 were performed with reference to the aforementioned performance test. Here, only the emulsion system structure of Examples 10-15 was observed. The test results are shown in the accompanying drawings and the table below.

[0035] From the test results in the table above, it can be seen that after determining the combination of sodium di(lauroyl glutamine) lysine and polysilicone-15, Examples 10-15 tried to adjust the ratio of other oils. We found that high-polarity, low-polarity, and non-polar oils were more difficult to form multiple structures (see Appendix Figure 6 ), it can be seen that no W / O / W multiple structures can be formed; The reasons for this may be that when the polarity of the oil is too high, sodium di(lauroyl glutamine) lysine is more likely to be arranged at the oil-water interface to form a simple O / W solution. When the polarity of the oil is low or non-polar, there is less sodium di(lauroyl glutamine) lysine inside the oil droplet, making it difficult to form an inner water phase and thus difficult to form a multiple structure. In summary, a reasonable combination of oil polarity and ratio is required to form a multiple structure. Combined with the above experimental data, it can be analyzed that when the hydrophilic emulsifier sodium di(lauroyl glutamine) lysine is combined with polysilicone-15 in the emulsion formula, under specific oil type conditions, such as ethylhexyl salicylate, ethylhexyl methoxycinnamate, and octocrylene, where ethylhexyl salicylate can be replaced with diethylhexyl sebacate or caprylic / capric triglyceride in equal amounts, a relatively good multiple-structure sunscreen lotion can be generated. Moreover, when the amount of sodium di(lauroyl glutamine) lysine is 0.15-0.25%, the amount of polysilicone-15 is 1.5-2%, and the total amount of ethylhexyl methoxycinnamate, ethylhexyl salicylate, octocrylene and diethylaminohydroxybenzoyl hexyl benzoate is 10-13%, the resulting multiple sunscreen lotion also has the effect of enhancing SPF when exposed to water.

[0036] The above are all modifications that a person skilled in the art can make to this embodiment as needed after reading this specification, which do not contribute creatively or solutions that obviously constitute technical inspiration. However, as long as they are within the scope of the claims of this application, they should be protected by patent law.

Claims

1. A water-soluble SPF-enhanced multi-sunscreen lotion, characterized in that: The raw materials used in the preparation include the following components in percentage by weight: Phase A: polyol 1-10%, thickener 0.1-1%, hydrophilic emulsifier 0.1-0.5%, disodium EDTA 0-0.03%, skin conditioner 0-0.5%, water as the balance; Phase B: sunscreen 5-20%, emollient 0-10%; Phase C: sunscreen composition 0-3%, skin conditioner 0-0.3%; Wherein, the hydrophilic emulsifier in phase A is sodium di(lauroyl glutamine) lysine; The sunscreen in phase B is composed of two or more of polysilicone-15 and ethylhexyl methoxycinnamate, octocrylene, ethylhexyl salicylate, homosalate, ethylhexyl triazone, isoamyl 4-methoxycinnamate, diethylamino hydroxybenzoyl hexyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, and diethylhexyl butamido triazone; The emollient in phase B is selected from one or more of diisopropyl sebacate, C12-15 alkyl benzoate, butyloctanol salicylate, dicaprylyl carbonate, caprylic / capric triglyceride, propylene glycol dicaprylate / dicaprate, neopentyl glycol diheptanoate, dibutyl adipate, glyceryl triethylhexanoate, isononyl isononanoate, isopropyl myristate, mineral oil, squalane, isohexadecane, dimethicone, caprylyl methicone, phenyl trimethicone, jojoba (SIMMONDSIA CHINENSIS) seed oil, sunflower (HELIANTHUS ANNUUS) seed oil, white meadowfoam (LIMNANTHES ALBA) seed oil, and hydrogenated cottonseed oil; The sunscreen composition in phase C is composed of methylene bis-phenyltriazolyl tetramethylbutylphenol, water, decyl glucoside, butylene glycol and xanthan gum.

2. The water-soluble SPF-enhanced multi-sunscreen emulsion according to claim 1, characterized in that: The raw materials used for preparation include the following components in percentage by weight: Phase A: polyol 1-10%, thickener 0.1-1%, sodium di(lauroyl glutamine) lysine 0.1-0.5%, disodium EDTA 0.03%, skin conditioner 0.35%, water as the balance; Phase B: Diethylamino Hydroxybenzoyl Hexyl Benzoate 1.0%, Polysilicone-15 0.5-2.0%, Ethylhexyl Methoxycinnamate 3.0-8.0%, Octocrylene 0.5-4.0%, Ethylhexyl Salicylate 1.5-5%; Phase C: sunscreen composition 3%, skin conditioner 0.3%.

3. The water-soluble SPF-enhanced multi-sunscreen emulsion according to claim 1, characterized in that: The raw materials used in the preparation include the following components in percentage by weight: Phase A: polyol 1-10%, thickener 0.1-1%, sodium di(lauroyl glutamine) lysine 0.1-0.5%, disodium EDTA 0.03%, skin conditioning agent 0.35%, water as the balance; Phase B: Diethylamino Hydroxybenzoyl Hexyl Benzoate 1.0%, Polysilicone-15 0.5-2.0%, Ethylhexyl Methoxycinnamate 3.0-8.0%, Octocrylene 0.5-4.0%, Emollient 1.5-5%; Phase C: sunscreen composition 3%, skin conditioner 0.3%.

4. The water-soluble SPF-enhanced multi-sunscreen emulsion according to any one of claims 1 to 3, characterized in that: The polyol in phase A is selected from one or more combinations of 1,3-propylene glycol, glycerol polyether-26, dipropylene glycol, butylene glycol, glycerol, and 1,2-hexanediol.

5. The water-soluble SPF-enhanced multi-sunscreen emulsion according to any one of claims 1 to 3, characterized in that: The thickener in phase A is selected from one or more combinations of ammonium acryloyldimethyl taurate / VP copolymer, xanthan gum, gum arabic, pectin, hydroxyethyl cellulose, acrylic acid (esters) / C10-30 alkyl acrylate crosspolymer, sodium polyacrylate, acrylic acid (esters) / vinyl isodecanoate crosspolymer, and ammonium polyacryloyldimethyl taurate.

6. The water-soluble SPF-enhanced multi-sunscreen emulsion according to any one of claims 1 to 3, characterized in that: The skin conditioning agent in phase A and phase C is selected from one or more combinations of p-hydroxyacetophenone, methylpropylene glycol, caprylhydroxamic acid, and glyceryl caprylate.

7. The method for preparing the water-soluble SPF-enhanced multi-sunscreen emulsion according to any one of claims 1 to 3, characterized in that: The following steps are involved: 1) Add all components of Phase A to the aqueous phase pot and heat to 80-85°C. Stir continuously for 15-20 minutes until a uniform and transparent aqueous phase solution I is formed. 2) Simultaneously add all ingredients of Phase B to the oil phase pot and heat to 80-85°C. Stir until completely melted. Then, pump Phase B into Solution I obtained in Step 1) and homogenize at 3000-4000 rpm for 4-5 minutes. Finally, stir and cool the system to 40°C. Add Phase C, stir evenly, and filter the material.

8. The method for preparing the water-soluble SPF-enhanced multi-sunscreen emulsion according to claim 7, wherein: In step 2), a stepwise heating mode is adopted, that is, the temperature is increased by 5° C. every 5 minutes, the temperature is controlled to 80-85° C., and low-speed stirring is maintained at 200-300 rpm until the mixture is completely melted.

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