Physical and chemical combined sunscreen water dispersion slurry as well as preparation method and application thereof

Abstract

The invention relates to physico-chemical combined sunscreen water dispersion slurry as well as a preparation method and application thereof. The water dispersible slurry comprises 5-20% of an inorganic sun-screening agent, 25-50% of an organic sun-screening agent, 10-30% of a humectant, 5-15% of an emulsifier, 0.1-2% of a preservative and the balance of water. The preparation method comprises the following steps: heating and dissolving the organic sun-screening agent, and cooling to room temperature; dispersing the emulsifier into the humectant, and uniformly stirring to prepare D-phase gel; adding inorganic sun-screening agent powder and the organic sun-screening agent liquid into the D-phase gel, and stirring at a high speed to obtain viscous O / D-phase gel; the mixed water and the O / D phase gel are stirred and dispersed into O / W emulsion; and carrying out high-pressure homogenization on the O / W emulsion. The water dispersible slurry can be used as a raw material to be applied to sunscreen daily cosmetics, especially O / W type sunscreen cream. By precisely regulating and controlling D-phase emulsification and a high-pressure homogenization process, a stable nano dispersion system is constructed, particle aggregation is inhibited, and the stability of the water dispersion slurry is improved. The prepared sunscreen water dispersible slurry is easy to disperse and suitable for various sunscreen systems, and the production efficiency is greatly improved.

Description

Technical Field

[0001] The present application relates to the technical field of daily cosmetics, and more specifically to a physicochemical combined sunscreen water-dispersible slurry and a preparation method and application thereof. Background Art

[0002] As public awareness of sun protection continues to rise, the market demand for sunscreen products continues to grow. Currently, the sunscreen ingredients commonly used in sunscreen products are mainly divided into two categories: inorganic sunscreens and organic sunscreens.

[0003] Inorganic sunscreens, represented by zinc oxide and titanium dioxide, have the ability to protect against both UVA and UVB rays. They absorb, reflect, and scatter UV rays, creating a UV shield on the skin's surface. Furthermore, these sunscreens are not absorbed by the skin, are less allergenic, and are safer. Organic sunscreens, a class of organic compounds that absorb UV rays well, offer superior protection compared to inorganic sunscreens. However, organic sunscreens can be irritating to the skin and may cause skin discomfort in some users.

[0004] In terms of product formula systems, most formulas with high content of sunscreen on the market use oil-in-water systems. However, the oil-in-water system has obvious defects. During the initial application, its skin feel is thicker and stickier than the water-in-oil system, which gives users a poor experience. At the same time, the formula stability of this system is greatly affected by temperature. Under different temperature environments, the performance of the product may vary greatly. For inorganic sunscreens, it is difficult for its water-in-oil system to take into account both good skin feel and stability. Generally speaking, physical sunscreen products (mainly based on inorganic sunscreens) are expensive, the skin tends to feel dry after use, and the coating uniformity is poor. In order to improve these problems, more silicone oil or other breathable oils and moisturizers need to be added, which undoubtedly further increases the cost. Although organic sunscreens are generally lower in cost, they are more greasy in texture. In order to improve the product experience, more special powders need to be added, which also leads to a significant increase in cost. Summary of the Invention

[0005] In order to solve the above-mentioned problems, the present application provides a physicochemical combined sunscreen water-dispersible slurry and its preparation method and application.

[0006] In the first aspect, the present application provides a physicochemical combined sunscreen water dispersible slurry using the following technical solutions: A physicochemical combined sunscreen water dispersible slurry, calculated by mass percentage, comprising the following components: Inorganic sunscreen 5-20%, organic sunscreen 25-50%, moisturizer 10-30%, emulsifier 5-15%, preservative 0.1-2%, and the balance is water.

[0007] Optionally, the organic sunscreen is selected from at least one of ethylhexyl methoxycinnamate, octocrylene, ethylhexyl salicylate, benzophenone-3, homosalate, butyl methoxydibenzoylmethane, polysilicone-15, terephthalylidene dicamphorsulfonic acid, drometrizole trisiloxane, diethylhexyl butamido triazone, methylene bis-benzotriazolyl tetramethylbutylphenol, bis-ethylhexyloxyphenol methoxyphenyl triazine, terphenyl triazine, diethylamino hydroxybenzoyl hexyl benzoate, ethylhexyl triazone, and isopentyl p-methoxycinnamate.

[0008] Optionally, the inorganic sunscreen is selected from at least one of surface-treated nano titanium dioxide and nano zinc oxide powder; wherein the surface treatment agent used for nano titanium dioxide is selected from at least one of stearic acid, triethoxycaprylylsilane, trimethoxyhexylsilane, polydimethylsiloxane, hydrogenated polydimethylsiloxane, and silicone resin; the surface treatment agent used for nano zinc oxide is selected from at least one of triethoxycaprylylsilane, polydimethylsiloxane, dimethoxydiphenyl alkane / triethoxycaprylylsilane cross-linked copolymer, and octyltriethoxysilane.

[0009] Optionally, the moisturizing agent is selected from at least one of glycerin, butylene glycol, propylene glycol, polyethylene glycol, hexylene glycol, xylitol, polypropylene glycol, sorbitol, and sodium hyaluronate.

[0010] Optionally, the emulsifier is selected from at least one of potassium cetyl phosphate, cetearyl alcohol, Tween 60, glyceryl stearate, steareth-21, steareth-2, hydrogenated castor oil, and Tween 60.

[0011] In a second aspect, the present application provides a method for preparing a physicochemical combined sunscreen water-dispersible slurry using the following technical solution: A method for preparing a physicochemical combined sunscreen water-dispersible slurry, comprising the following steps: S1. Heat the organic sunscreen to completely dissolve it, and then cool it to room temperature; S2. Disperse and dissolve the emulsifier in the moisturizer, and stir until no solid particles remain to form a phase D gel; S3, adding the inorganic sunscreen powder and the organic sunscreen liquid in S1 to the emulsion D phase gel, and stirring at high speed to obtain a viscous O / D phase gel; S4, mixing water and the O / D phase gel and stirring to disperse to obtain an O / W emulsion; S5. High-pressure homogenization is performed on the O / W emulsion obtained in S4 to obtain.

[0012] Furthermore, the specific process parameters of the high-pressure homogenization in S5 are: dispersion using a high-pressure homogenizer, a rotation speed of 10000-20000 rpm, a homogenization pressure of 600-1300 bar, and a homogenization number of 1-2 times.

[0013] In a third aspect, the present application provides a physicochemical combined sunscreen water dispersible slurry using the following technical solutions: The above-mentioned physicochemical combined sunscreen water dispersion slurry or the physicochemical combined sunscreen water dispersion slurry prepared by the above-mentioned physicochemical combined sunscreen water dispersion slurry preparation method can be used as a raw material for preparing sunscreen daily cosmetics.

[0014] Furthermore, after being added into the formula of sunscreen daily cosmetics, the physicochemical combined sunscreen water dispersion slurry can increase the SPF value of the product to above 60, and there is no delamination or oil release after being stored at 50°C or -18°C for 30 days.

[0015] In a fourth aspect, the present application provides an O / W sunscreen that adopts the following technical solutions: An O / W sunscreen cream comprises, calculated by mass percentage, 30-40% of the above-mentioned physicochemical combined sunscreen water dispersion slurry or the physicochemical combined sunscreen water dispersion slurry prepared by the above-mentioned preparation method of the physicochemical combined sunscreen water dispersion slurry.

[0016] In summary, this application has the following beneficial effects: 1. This application constructs a stable nanodispersion system by precisely controlling the D-phase emulsification and high-pressure homogenization process, maintaining it in a kinetically stable state. This effectively inhibits the agglomeration of particles and significantly improves the stability of the water-dispersible slurry. Furthermore, the sunscreen water-dispersible slurry prepared by this method is easily dispersed in water and can be adapted to a variety of sunscreen systems, whether oil-in-water or water-in-oil formulations, or can be directly added to existing formulations with lower sun protection values. This significantly improves production efficiency compared to directly using sunscreen agents for formulation application and production. 2. The process of this application can disperse organic sunscreens and physical sunscreens more evenly, thereby achieving a synergistic sunscreen effect. The organic sunscreen and physical sunscreen powders are made into a water-dispersible slurry, which is presented in liquid form. Unlike organic sunscreens, there is no need to heat and dissolve them before use. It also avoids the problem of dust generated during the use of inorganic physical powders, greatly simplifying the production process and further improving production efficiency. 3. The aqueous slurry prepared in this application can be directly dispersed in the aqueous phase, and is easier to use with other ingredients in the formula, showing better dispersibility and stability, which provides convenience for the formulation design and production of sunscreen products. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 10 μm microscope images of Examples 1-2 and Comparative Examples 1-2 of the present application; Figure 2 These are 10 μm microscope images of Examples 3-4 and Comparative Examples 3-4 of the present application. DETAILED DESCRIPTION

[0018] 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.

[0019] 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.

[0020] Unless otherwise specified, all reagents and instruments used were commercially available.

[0021] Example 1 A physicochemical combined sunscreen water dispersible slurry, composed of the following components by weight percentage: Physical sunscreen: 10% stearic acid-modified nano-titanium dioxide; Organic Sunscreen: 10% Ethylhexyl Triazone, 10% Diethylamino Hydroxybenzoyl Hexyl Benzoate, 10% Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine, 9.5% Isoamyl p-Methoxycinnamate; 0.5% Tocopherol; Humectant: 20% glycerin; Emulsifiers: 5% potassium cetyl phosphate and 5% polysorbate 60; Preservatives: 0.8% propylene glycol, 0.15% caprylyl glycol, and 0.05% ethylhexylglycerin; The balance is water; And it is prepared by the following preparation method: S1. Heat the organic sunscreen to completely dissolve it, and then cool it to room temperature; S2. Disperse and dissolve the emulsifier in the moisturizer, and stir until no solid particles remain to form a phase D gel; S3, adding the inorganic sunscreen powder and the organic sunscreen liquid in S1 to the emulsion D phase gel, and stirring at high speed to obtain a viscous O / D phase gel; S4, mixing water and the O / D phase gel and stirring to disperse to obtain an O / W emulsion; Step 5: The O / W emulsion obtained in step 4 is subjected to high-pressure homogenization at a pressure of 1000 bar for one pass to obtain a finished physicochemically combined water-dispersible slurry; Example 2 A physicochemical combined sunscreen water dispersible slurry, the preparation method of which is basically the same as that of Example 1, the only difference being that the components used are different: Physical sunscreen: 10% stearic acid-modified nano-titanium dioxide; Organic sunscreens: 10% ethylhexyl triazone, 10% butyl methoxydibenzoylmethane, 10% bis-ethylhexyloxyphenol methoxyphenyl triazine, 8% octocrylene, and 7% ethylhexyl salicylate; Humectant: 18% glycerin; Emulsifiers: 5% potassium cetyl phosphate and 5% polysorbate 60; Preservatives: 0.8% propylene glycol, 0.15% caprylyl glycol, and 0.05% ethylhexylglycerin; The balance is water; Example 3 A physicochemical combined sunscreen water dispersible slurry, the preparation method of which is basically the same as that of Example 1, the only difference being that the components used are different: Physical sunscreen: 15% alkyl silicon modified nano zinc oxide; Organic sunscreens: 7.5% Ethylhexyl Triazone, 7.5% Diethylamino Hydroxybenzoyl Hexyl Benzoate, 10% Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine, 9.5% Isoamyl p-Methoxycinnamate; 0.5% Tocopherol; Humectant: 20% glycerin; Emulsifiers: 5% potassium cetyl phosphate and 5% cetearyl alcohol; Preservatives: 0.8% propylene glycol, 0.15% caprylyl glycol, and 0.05% ethylhexylglycerin; The balance is water; Example 4 A physicochemical combined sunscreen water dispersible slurry, the preparation method of which is basically the same as that of Example 1, the only difference being that the components used are different: Physical sunscreen: 5% alkyl silicon modified nano zinc oxide and 5% stearic acid modified nano titanium dioxide; Organic Sunscreen: 10% Ethylhexyl Triazone, 10% Diethylamino Hydroxybenzoyl Hexyl Benzoate, 10% Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine, 9.5% Isoamyl p-Methoxycinnamate; 0.5% Tocopherol; Humectant: 20% glycerin; Emulsifiers: 5% potassium cetyl phosphate and 5% cetearyl alcohol; Preservatives: 0.8% propylene glycol, 0.15% caprylyl glycol, and 0.05% ethylhexylglycerin; The balance is water; Comparative Example 1 A physicochemical combined sunscreen water dispersion slurry, the dosage of each component of which is basically the same as that of Example 1, the only difference being that the high-pressure homogenization condition in the preparation step S5 is 1000 bar, and the homogenization is performed twice.

[0022] Comparative Example 2 A physicochemical combined sunscreen water dispersion slurry, the dosage of each component of which is basically the same as that of Example 2, the only difference being that the high-pressure homogenization condition in the preparation step S5 is 1500 bar, and the homogenization is performed once.

[0023] Comparative Example 3 A physicochemical combined sunscreen water dispersible slurry, composed of the following components by weight percentage: Physical sunscreen: 15% alkyl silicon modified nano zinc oxide; Organic sunscreens: 7.5% Ethylhexyl Triazone, 7.5% Diethylamino Hydroxybenzoyl Hexyl Benzoate, 10% Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine, 9.5% Isoamyl p-Methoxycinnamate; 0.5% Tocopherol; Humectant: 20% glycerin; Emulsifiers: 5% potassium cetyl phosphate and 5% cetearyl alcohol; Preservatives: 0.8% propylene glycol, 0.15% caprylyl glycol, and 0.05% ethylhexylglycerin; The balance is water; And it is prepared by the following preparation method: S1. Heat the organic sunscreen to completely dissolve it, and then cool it to room temperature; S2, adding an emulsifier, a preservative, and a moisturizer to water, and performing shear dispersion to obtain an aqueous phase; S3, adding the inorganic sunscreen powder and the organic sunscreen liquid to the aqueous phase, and dispersing at high speed to obtain a pre-water slurry; S4, the pre-water slurry obtained in S3 is subjected to high-pressure homogenization at a pressure of 1000 bar for one pass to obtain a finished physicochemical combined slurry; Comparative Example 4 A physicochemical combined sunscreen water dispersible slurry, composed of the following components by weight percentage: Physical sunscreen: 5% alkyl silicon modified nano zinc oxide and 5% stearic acid modified nano titanium dioxide; Organic Sunscreen: 10% Ethylhexyl Triazone, 10% Diethylamino Hydroxybenzoyl Hexyl Benzoate, 10% Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine, 9.5% Isoamyl p-Methoxycinnamate; 0.5% Tocopherol; Humectant: 20% glycerin; Emulsifiers: 5% potassium cetyl phosphate and 5% cetearyl alcohol; Preservatives: 0.8% propylene glycol, 0.15% caprylyl glycol, and 0.05% ethylhexylglycerin; The balance is water; And it is prepared by the following preparation method: S1. Heat the organic sunscreen to completely dissolve it, and then cool it to room temperature; S2. Disperse and dissolve the emulsifier in the moisturizer, and stir until no solid particles remain to form a phase D gel; S3, adding the inorganic sunscreen powder and the organic sunscreen liquid in S1 to the D phase gel, and stirring at high speed to obtain a viscous O / D phase gel; S4. Mix water and O / D phase gel and stir to disperse to obtain O / W emulsion, i.e. finished physicochemical sunscreen water dispersion slurry; performance testing The samples prepared in Examples 1-4 and Comparative Examples 1-4 were subjected to various performance tests, including stability tests, formulation application tests, and microscopic images.

[0024] (1) Stability test 1. Heat and cold resistance stability test ① Each sample was placed in a 50℃ electric thermostat for 30 days and then observed after returning to room temperature; ② Each sample was placed in a -18℃ constant temperature refrigerator for 30 days and then observed after returning to room temperature; ③ Prepare 10% aqueous solution for each sample, place in a 50℃ electric heating constant temperature box for 30 days, and return to room temperature Observe later.

[0025] 2. Centrifugal stability test Each sample was placed in a centrifuge with a radius of 10 cm and centrifuged at 3000 rpm for 30 min to observe changes in the properties of the sample.

[0026] The test results are shown in the table below.

[0027] It can be clearly seen from the above test result table that the pressure and the number of homogenization times during the high-pressure homogenization process have a significant impact on the stability of the prepared physicochemical combined sunscreen water dispersion slurry; on the contrary, whether or not homogenization treatment is performed has no obvious effect on the stability of the sample.

[0028] (2) Microscope test The physicochemical combined sunscreen water dispersion samples prepared in Examples 1-4 and Comparative Examples 1-4 were observed under a microscope. The test results can be found in the attached Figure 1-2By comparing the microscopic images, it can be seen that the samples prepared in Examples 1-2 are uniformly distributed microparticles under the microscope, while the samples prepared in Comparative Examples 1-2 have uneven particle size distribution and obvious oily aggregates under the microscope, indicating that the oil phase has demulsified under the high-pressure homogenization conditions, that is, the high-pressure homogenization conditions have a significant impact on the stability of the system; From the microscope images of Example 3-4 and Comparative Example 3-4, it can be seen that the particle size distribution of the samples is uneven when the emulsification process is changed or high-pressure homogenization is not performed, which means that the emulsification process and high-pressure homogenization have a significant impact on the particle size distribution of the product.

[0029] Application Examples 1-4 An O / W sunscreen, wherein the components are as follows: The sources of sunscreen water-dispersible slurries are different, the details are as follows: Application Example 1 Sunscreen water dispersion slurry is prepared from Example 1 Application Example 2 Sunscreen water dispersion slurry is prepared from Example 2 Application Example 3 Sunscreen water dispersion slurry is prepared from Example 3 Application Example 4 Sunscreen water dispersion slurry is prepared from Example 4 The above-mentioned O / W type sunscreen is prepared by the following method: Prepare the aqueous phase: mix the preservative, moisturizer, and thickener evenly, heat and stir until completely dispersed, add the sunscreen slurry of Example 1, and stir until completely dispersed; Prepare the oil phase: Mix the oil and emulsifier evenly, stir and heat to 80-90℃ to prepare the oil phase; Preparation of oil-in-water sunscreen: heating the water phase and the oil phase to 80-90° C. respectively, then adding the oil phase to the water phase under stirring, stirring evenly, and cooling to room temperature to obtain the sunscreen.

[0030] Application Comparative Examples 1-4 An O / W sunscreen, wherein the components are as follows: The sources of sunscreen water-dispersible slurries are different, the details are as follows: Comparative Application Example 1 Sunscreen water dispersion slurry is prepared from Comparative Example 1 Application Comparative Example 2 Sunscreen water dispersion slurry is prepared from Comparative Example 2 Application Comparative Example 3 Sunscreen water dispersion slurry is prepared from Comparative Example 3 Comparative Application Example 4 Sunscreen water dispersion slurry is prepared from Comparative Example 4 The above-mentioned O / W type sunscreen is prepared by the following method: Prepare the aqueous phase: mix the preservative, moisturizer, and thickener evenly, heat and stir until completely dispersed, add the sunscreen slurry of Example 1, and stir until completely dispersed; Prepare the oil phase: mix the oil and emulsifier evenly, stir and heat to 80-90°C to prepare the oil phase; Preparation of oil-in-water sunscreen: heating the water phase and the oil phase to 80-90° C. respectively, then adding the oil phase to the water phase under stirring, stirring evenly, and cooling to room temperature to obtain the sunscreen.

[0031] The performance of the O / W sunscreens prepared in the above-mentioned application examples 1-4 and comparative examples 1-4 was tested. The test method referred to the SN / T5150-2019 in vitro determination method for UVA light protection of sunscreen cosmetics. The prepared sunscreens were tested on the UV-2000S equipment. The test results are shown in the table below. Skin feel Sun Protection Factor (SPF) Sun Protection Index PA Application Example 1 lubricating 66.28 22.85 Application Example 2 lubricating 70.96 25.62 Application Example 3 lubricating 63.19 19.58 Application Example 4 lubricating 68.55 21.22 Comparative Application Example 1 Greasy and difficult to spread 51.22 18.24 Application Comparative Example 2 Greasy and difficult to spread 43.55 16.57 Application Comparative Example 3 lubricating 56.28 14.33 Comparative Application Example 4 lubricating 47.07 16.73

[0032] By comparing and analyzing the SPF data of Application Examples 1-4 and Comparative Examples 1-4, it can be clearly found that the SPF values ​​presented by Application Examples 1-4 are significantly higher than those of Comparative Examples 1-4. Judging from the data results of instrument detection, this means that Application Examples 1-4 have more outstanding sun protection effects.

[0033] Further comparison of the skin feel of the application examples 1-2 and the application comparison examples 1-2 shows that the skin feels smooth when the application example products are applied, while the application comparison example products feel greasy and difficult to spread evenly. Figure 1 From the microscope pictures of Comparative Examples 1-2, it can be seen that the samples of Comparative Examples 1-2 showed demulsification, which caused the organic sunscreen agents therein to agglomerate and could not be evenly dispersed in the aqueous phase, thereby causing difficulty in application.

[0034] 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 physicochemical combined sunscreen water dispersible slurry, characterized in that: Calculated by mass percentage, the composition includes: 5-20% inorganic sunscreen, 25-50% organic sunscreen, 10-30% moisturizer, 5-15% emulsifier, 0.1-2% preservative, and the balance is water.

2. The physicochemical combined sunscreen water dispersible slurry according to claim 1, characterized in that: The organic sunscreen is selected from at least one of ethylhexyl methoxycinnamate, octocrylene, ethylhexyl salicylate, benzophenone-3, homosalate, butyl methoxydibenzoylmethane, polysilicone-15, terephthalylidene dicamphorsulfonic acid, drometrizole trisiloxane, diethylhexyl butamido triazone, methylene bis-benzotriazolyl tetramethylbutylphenol, bis-ethylhexyloxyphenol methoxyphenyl triazine, terphenyl triazine, diethylamino hydroxybenzoyl hexyl benzoate, ethylhexyl triazone, and isopentyl p-methoxycinnamate.

3. The physicochemical combined sunscreen water dispersible slurry according to claim 1, characterized in that: The inorganic sunscreen agent is selected from at least one of surface-treated nano titanium dioxide and nano zinc oxide powder; wherein the surface treatment agent used for nano titanium dioxide is selected from at least one of stearic acid, triethoxyoctylsilane, trimethoxyhexylsilane, polydimethylsiloxane, hydrogenated polydimethylsiloxane, and silicone resin; the surface treatment agent used for nano zinc oxide is selected from at least one of triethoxyoctylsilane, polydimethylsiloxane, dimethoxydiphenyl alkane / triethoxyoctylsilane cross-linked copolymer, and octyltriethoxysilane.

4. The physicochemical combined sunscreen water dispersible slurry according to claim 1, characterized in that: The moisturizing agent is selected from at least one of glycerin, butylene glycol, propylene glycol, polyethylene glycol, hexylene glycol, xylitol, polypropylene glycol, sorbitol, and sodium hyaluronate.

5. The physicochemical combined sunscreen water dispersible slurry according to claim 1, characterized in that: The emulsifier is selected from at least one of potassium cetyl phosphate, cetearyl alcohol, Tween 60, glyceryl stearate, steareth-21, steareth-2, hydrogenated castor oil, and Tween 60.

6. The method for preparing the physicochemical combined sunscreen water dispersion slurry according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Heat the organic sunscreen to completely dissolve it, and then cool it to room temperature; S2. Disperse and dissolve the emulsifier in the moisturizer, and stir until no solid particles remain to form a phase D gel; S3, adding the inorganic sunscreen powder and the organic sunscreen liquid in S1 to the emulsion D phase gel, and stirring at high speed to obtain a viscous O / D phase gel; S4, mixing water and the O / D phase gel and stirring to disperse to obtain an O / W emulsion; S5. High-pressure homogenization is performed on the O / W emulsion obtained in S4 to obtain.

7. The method for preparing the physicochemical combined sunscreen water dispersion slurry according to claim 6, characterized in that: The specific process parameters of the high-pressure homogenization in S5 are: dispersion using a high-pressure homogenizer, a rotation speed of 10000-20000 rpm, a homogenization pressure of 600-1300 bar, and a homogenization number of 1-2 times.

8. Use of the physicochemical combined sunscreen water dispersible slurry according to any one of claims 1 to 5 and / or the physicochemical combined sunscreen water dispersible slurry prepared by the preparation method of the physicochemical combined sunscreen water dispersible slurry according to claim 6 in the preparation of sunscreen daily cosmetics.

9. The use according to claim 8, characterized in that The physicochemical combined sunscreen water dispersion slurry can increase the SPF value of the product to above 60 after being added into the formula of sunscreen daily cosmetics, and has no delamination or oily appearance after being stored at 50° C. or -18° C. for 30 days.

10. An O / W sunscreen, characterized in that: The invention relates to a physicochemically combined sunscreen water dispersion slurry as described in any one of claims 1 to 5 or a physicochemically combined sunscreen water dispersion slurry prepared by the preparation method of the physicochemically combined sunscreen water dispersion slurry as described in claim 6, and the amount of the physicochemically combined sunscreen water dispersion slurry added to the O / W sunscreen is 30-40% by mass.

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