Sunscreen composition as well as preparation method and application thereof

Abstract

According to the sunscreen composition, the preparation method and the application, the sunscreen index can be increased. The sunscreen composition comprises the following components in percentage by mass: 0.001-65% of an oil-soluble sunscreen agent, 0.1-0.5% of a surfactant, 0.1-0.5% of an antioxidant, 0.1-0.5% of a preservative and the balance of water. The thickening agent is prepared from trihydroxy stearin and disteardimonium hectorite, the mass fraction of the thickening agent is 6 to 10 percent, the mass fraction of the trihydroxy stearin is 3 to 6 percent, and the mass fraction of the disteardimonium hectorite is not less than 1 percent; and oil.

Description

Technical Field

[0001] The present invention relates to the technical field of sunscreens, and particularly to a sunscreen composition, a preparation method and uses thereof. Background Art

[0002] The sun protection factor (SPF) represents the ability of a product to defend against medium-wave ultraviolet rays with a specific numerical value, and is the mainstream protection index for evaluating the ability of a sunscreen to protect the skin from sunburn erythema / sunburn.

[0003] Chemical sunscreens are a widely used type of sunscreen. Chemical sunscreen molecules can absorb ultraviolet rays, undergo a photochemical reaction, and convert ultraviolet rays into heat energy, thereby avoiding damage to the skin by ultraviolet rays. Generally, sunscreens can be added to sunscreen products to increase the sun protection index; however, simply increasing the sun protection index by adding sunscreens has limited effects.

[0004] In some studies, it was found that when using trimethylolpropane tristearate as a thickener in combination with certain chemical sunscreens, the sun protection index can also be increased. However, it is difficult to further increase the sun protection index on this basis.

[0005] That is, for sunscreen products containing trimethylolpropane tristearate and chemical sunscreens, how to further increase the sun protection index remains an unsolved problem at present. Summary of the Invention

[0006] One object of the embodiments of the present application is to solve at least one of the above problems in the background and provide corresponding beneficial effects.

[0007] Another object of the embodiments of the present application is to provide a sunscreen composition, a preparation method and uses thereof, which can increase the sun protection index.

[0008] The embodiments of the present application mainly achieve the above objects through the following technical solutions.

[0009] In a first aspect, the embodiments of the present application provide a sunscreen composition, comprising:

[0010] An oil-soluble sunscreen, the mass fraction of the oil-soluble sunscreen being 0.001 - 65%;

[0011] A thickener, the thickener comprising trimethylolpropane tristearate and lithium magnesium silicate, the mass fraction of the thickener being 6 - 10%, the mass fraction of trimethylolpropane tristearate being 3 - 6%, and the mass fraction of lithium magnesium silicate being not less than 1%; and an oil.

[0013] In a second aspect, the embodiments of the present application provide a preparation method of a sunscreen composition, comprising:

[0014] Mix an oil-soluble sunscreen agent, a thickener and an oil to obtain a first mixture; wherein, the mass fraction of the oil-soluble sunscreen agent is 0.001-6%; the mass fraction of the thickener is 6-10%, and the thickener includes trihydroxystearin and lithium magnesium stearate montmorillonite, the mass fraction of the trihydroxystearin is 3-6%, and the mass fraction of the lithium magnesium stearate montmorillonite is not less than 1%;

[0015] Heat and stir the first mixture under the conditions of a heating temperature of 80-95°C and a stirring speed of 20-50 r / min to obtain a second mixture;

[0016] Perform a first homogenization treatment on the second mixture to obtain a homogenized product; wherein, the homogenization speed of the first homogenization treatment is 1000-3000 r / min, and the homogenization duration is 3-10 min;

[0017] Lower the temperature of the homogenized product to 55-63°C and perform a second homogenization treatment to obtain a sunscreen composition; wherein, the homogenization speed of the second homogenization treatment is 3000-4500 r / min, and the homogenization duration is 10-30 min.

[0018] In a third aspect, an embodiment of the present application provides a use of the sunscreen composition according to the first aspect in the preparation of cosmetics.

[0019] The beneficial effects of the embodiments of the present invention include:

[0020] 1. The sunscreen composition provided by the embodiments of the present application contains a specific thickener formed by the compounding of trihydroxystearin and lithium magnesium stearate montmorillonite, which can improve the sun protection index of the sunscreen composition to obtain a better sun protection effect, thereby overcoming the defects proposed in the background.

[0021] 2. The sunscreen composition provided by the embodiments of the present application has excellent shear resistance due to the inclusion of a specific thickener, which is not only convenient for application but also can improve the sun protection effect.

[0022] 3. The sunscreen composition provided by the embodiments of the present application also has an anti-oil seepage effect through a specific thickener. Description of the Drawings

[0023] Figure 1 It is a schematic diagram of a "sun protection film" formed by applying a sunscreen product on the skin;

[0024] Figure 2 It is another schematic diagram of a "sun protection film" formed by applying a sunscreen product on the skin;

[0025] Figure 3 It is an external view schematic diagram of the sunscreen composition of Comparative Example 6 of the present application;

[0026] Figure 4 A schematic diagram of the appearance of the sunscreen composition of Example 1 of the present application;

[0027] Figure 5 A schematic diagram of the skin surface topography before treatment in Experimental Example 4 of the present application;

[0028] Figure 6 A schematic diagram of the skin surface topography after treatment in Experimental Example 4 of the present application. Detailed implementation manners

[0029] The present invention will be further described in detail below with reference to the accompanying drawings, so that those skilled in the art can implement it according to the description in the specification.

[0030] In the embodiments of the present application, terms such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include at least one of such features.

[0031] Furthermore, the terms "include", "contain" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include steps or units not listed, or may optionally further include other steps or units inherent to these processes, methods, products or devices.

[0032] Unless otherwise stated, in the embodiments of the present application, the terms "sunscreen product", "sunscreen" and "sunscreen composition" can be used interchangeably.

[0033] Unless otherwise stated, in the embodiments of the present application, the term "oil" refers to a water-immiscible substance that is liquid at room temperature.

[0034] Unless otherwise stated, in the embodiments of the present application, the term "Octadecanoic Acid" refers to the substance with CAS number 139-44-6.

[0035] Unless otherwise stated, in the embodiments of the present application, the term "Quaternary Ammonium Compounds" refers to the substance with CAS number 94891-31-3.

[0036] Unless otherwise stated, in the embodiments of the present application, the term "oil-soluble sunscreen agent" refers to a substance that can dissolve in oil and has an ultraviolet absorption effect and / or an ultraviolet reflection effect.

[0037] In addition to the above, it should be emphasized that referring to "embodiments" in this text means that the specific features, structures, or characteristics described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0038] <Sun protection composition>

[0039] In a first aspect, an embodiment of the present application provides a sun protection composition, comprising:

[0040] An oil-soluble sunscreen agent, the mass fraction of the oil-soluble sunscreen agent being 0.001-65%;

[0041] A thickener, the thickener comprising trimethylol stearin and lithium magnesium stearate bentonite, the mass fraction of the thickener being 6-10%, the mass fraction of trimethylol stearin being 3-6%, and the mass fraction of lithium magnesium stearate bentonite being not less than 1%; and oil.

[0043] The sun protection composition provided by the embodiment of the present application has the following beneficial effects:

[0044] The sun protection composition provided by the embodiment of the present application contains a specific thickener formed by compounding trimethylol stearin and lithium magnesium stearate bentonite in a specific content, which can improve the sun protection index of the sun protection composition and obtain a better sun protection effect, thereby overcoming the defects proposed in the background.

[0045] In addition, after improving the sun protection effect, it is beneficial for the sun protection composition to achieve a better skin care effect.

[0046] The sun protection composition provided by the embodiment of the present application also has the following beneficial effects:

[0047] 1. The sun protection composition can achieve excellent shear resistance through a specific thickener, which is convenient for application and improves the sun protection effect. The specific analysis is as follows:

[0048] Due to the presence of lines and grooves on the surface of the human skin, it is uneven. The process of applying sunscreen can be understood as a process in which the body of the sunscreen is sheared by an external force and dispersed on the skin to form a "sun protection film" or "sun protection layer" with sun protection function.

[0049] In the process of forming the "sun protection film", the shear resistance of the sunscreen is particularly important. Shear resistance is a property in which the viscosity of the sunscreen rapidly decreases after a shear force is applied and rapidly recovers after the application of the shear force stops.

[0050] Generally speaking, if the material of a sunscreen product is not easily shear-thinned, its spreadability will be very poor and it will be difficult to be accepted by the market. On the other hand, if it is easily shear-thinned too much, the "sunscreen film" formed on the skin will be very thin, especially in the relatively convex areas of the skin (such as Figure 1 shown). It can be said that these convex areas are the weak points of sun protection and may have a very adverse effect on the sun protection effect. This problem is difficult to solve by adding sunscreen agents.

[0051] Therefore, if we want to balance spreadability and the thickness of the "sunscreen film", we need to consider shear resistance. Because good shear resistance can make the product quickly thin during application and easy to spread, and after application, the material will form a "sunscreen film" with a certain thickness on the skin (such as Figure 2 shown), thus solving the problem that the convex areas on the skin cannot be effectively covered and protected by sunscreen agents and improving the sun protection performance.

[0052] The embodiments of the present application found that when triphenyl trimellitate is added as a thickener to a sunscreen product, the shear resistance of the sunscreen product can be improved. However, if the externally applied shear force is too strong, the material may not be able to quickly recover its viscosity after the shear force is stopped due to the complete destruction of its structure.

[0053] Therefore, the sunscreen composition of the embodiments of the present application forms a specific thickener by the compounding of triphenyl trimellitate and lithium magnesium aluminum silicate, which can effectively improve the shear resistance, thereby solving the aforementioned problem of balancing spreadability and the thickness of the "sunscreen film" and being conducive to achieving better skin care effects.

[0054] 2. The sunscreen composition has a better anti-seepage oil effect through a specific thickener.

[0055] When the sunscreen agent added to the sunscreen product is triphenyl trimellitate, if the externally applied shear force is too strong, not only will the shear resistance become poor, but also an oil seepage phenomenon will occur simultaneously.

[0056] The reason may be that triphenyl trimellitate thickens by means of "reversible" cross-linking through hydrogen bonds. However, if the applied shear force is too strong, the cross-linking method of triphenyl trimellitate will be completely destroyed and the viscosity cannot be restored. As a result, the oily components "locked" by the thickening system of triphenyl trimellitate will ooze out, resulting in the phenomenon of sunscreen agent oozing out and reducing the sun protection effect. If we want to overcome the aforementioned problems, we need to reduce the degree of damage of the shear force to the thickening system constructed by triphenyl trimellitate.

[0057] In the embodiments of the present application, the combination of lithium dimethyldistearylammonium montmorillonite and trihydroxystearin can reduce or eliminate the aforementioned oil leakage phenomenon, making the sunscreen composition more stable, thus more conducive to reducing or avoiding the exudation of sunscreen agents and enhancing the sunscreen effect. Because, under the synergistic cooperation of lithium dimethyldistearylammonium montmorillonite and trihydroxystearin, a specific effect can be produced, that is, it will neither affect the shear resistance of the oil thickened by trihydroxystearin nor reduce the degree of damage of the shear force to the thickening system constructed by trihydroxystearin.

[0058] In some embodiments, the oil-soluble sunscreen agent is an oil-soluble chemical sunscreen agent.

[0059] In some embodiments, the oil-soluble sunscreen agent includes one or more of ethylhexyl methoxycinnamate, octocrylene, hexyl diethylaminohydroxybenzoyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl triazone, polysiloxane-15, isoamyl p-methoxycinnamate, homosalate, diethylhexyl butamido triazone, butyl methoxydibenzoylmethane, and cresyl triazone trisiloxane.

[0060] In some embodiments, the oil-soluble sunscreen agent is selected from one or more of ethylhexyl methoxycinnamate, octocrylene, hexyl diethylaminohydroxybenzoyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, and ethylhexyl triazone. In some embodiments, the mass fraction of the oil-soluble sunscreen agent is 0.001-65%; optionally 0.1-50%; optionally 1-50%; optionally 1-60%; optionally 5-55%; optionally 10-50%; optionally 10-45%; optionally 10-40%; optionally 10-35%; optionally 10-30%; optionally 15-30%; optionally 20-30%; optionally 22-28%; optionally 24-28%; optionally 27-29%; more specifically, it can be 0.001% or 5% or 10% or 15% or 20% or 25% or 26% or 30% or 35% or 40% or 45% or 50% or 55% or 60% or 65%.

[0061] In some embodiments, the oil-soluble sunscreen agent includes ethylhexyl methoxycinnamate, octocrylene, hexyl diethylaminohydroxybenzoyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, and ethylhexyl triazone, and the mass fraction of the oil-soluble sunscreen agent is 26%.

[0062] In some embodiments, the oil-soluble sunscreen agent includes ethylhexyl methoxycinnamate, octocrylene, hexyl diethylaminohydroxybenzoyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, and ethylhexyl triazone. In some embodiments, the mass fraction of ethylhexyl methoxycinnamate is 7-11%, optionally 9%;

[0063] In some embodiments, the mass fraction of octocrylene is 7-11%, optionally 8-9%, optionally 8% or 9%.

[0064] In some embodiments, the mass fraction of diethylamino hydroxybenzoyl hexyl benzoate is 1-5%, optionally 3-5%; optionally 4%.

[0065] In some embodiments, the mass fraction of bis-ethylhexyloxyphenol methoxyphenyl triazine is 1-6%, optionally 2-5%; optionally 2-4%, optionally 2% or 4%.

[0066] In some embodiments, the mass fraction of ethylhexyl triazone is 1-4%, optionally 1-3%, optionally 2%.

[0067] In some embodiments, the mass fraction of the thickener is 6-10%; more specifically, it can be 6% or 6.5% or 7% or 7.5% or 8% or 8.5% or 9% or 9.5% or 10%.

[0068] In some embodiments, the mass fraction of trihydroxystearin is 3-6%; more specifically, it can be 3% or 3.1% or 3.2% or 3.3% or 3.4% or 3.5% or 3.6% or 3.7% or 3.8% or 3.9% or 4% or 4.1% or 4.2% or 4.3% or 4.4% or 4.5% or 4.6% or 4.7% or 4.8% or 4.9% or 5% or 5.1% or 5.2% or 5.3% or 5.4% or 5.5% or 5.6% or 5.7% or 5.8% or 5.9% or 6%.

[0069] In some embodiments, the mass fraction of the thickener is 6%.

[0070] The mass fraction of lithium magnesium stearate bentonite is 1-3%, and the mass fraction of trihydroxystearin is 3-5%.

[0071] In some embodiments, the mass fraction of the thickener is 7%.

[0072] The mass fraction of lithium magnesium stearate bentonite is 1-4%, and the mass fraction of trihydroxystearin is 3-6%.

[0073] In some embodiments, the mass fraction of the thickener is 8%.

[0074] The mass fraction of lithium magnesium stearate bentonite is 2-5%, and the mass fraction of trihydroxystearin is 3-6%.

[0075] In some embodiments, the mass fraction of the thickener is 9%,

[0076] the mass fraction of lithium dimethyldistearylammonium montmorillonite is 3 - 6%, and the mass fraction of tripalmitin is 3 - 6%.

[0077] In some embodiments, the mass fraction of the thickener is 10%,

[0078] the mass fraction of lithium dimethyldistearylammonium montmorillonite is 4 - 7%, and the mass fraction of tripalmitin is 3 - 6%.

[0079] In the embodiments of the present application, there is no particular limitation on the type of oil. Exemplarily, the oil can be selected from one or more of pentaerythrityl tetra(ethylhexanoate), caprylic / capric triglyceride, tocopherol (vitamin E), dibutyl adipate, dicaprylyl carbonate, Limnanthes Alba seed oil, hydrogenated polyisobutene, tocopheryl acetate, diisostearyl dimer dilinoleate, triolein, cetyl alcohol ethylhexanoate.

[0080] It should be noted that the above specific types of oil are only examples and do not constitute any limitation to the present application.

[0081] In some embodiments, the content of the oil is the balance.

[0082] In the embodiments of the present application, the sunscreen composition may or may not contain water.

[0083] In some embodiments, when water is included in the sunscreen composition, there is no particular limitation on the type of water in the embodiments of the present application. The water can be selected from one or more of pure water, ultrapure water, deionized water, and floral water. It should be noted that the above specific types of water are only examples and do not constitute any limitation to the present application.

[0084] In some embodiments, the sunscreen composition may further include:

[0085] surfactants and / or emulsifiers.

[0086] In the case where a surfactant and / or an emulsifier is included in the sunscreen composition, the present application does not particularly limit the type of the surfactant and / or the emulsifier. Exemplarily, the surfactant and / or the emulsifier may be one or more of cetyl PEG / PPG-10 / 1 dimethicone, PEG-10 dimethicone, glyceryl stearate, ceteth-20, laureth-8 phosphate, PEG-40 hydrogenated castor oil, PEG-40 stearate, cetearyl glucoside, polysorbate-20, sorbitan trioleate, sorbitan stearate, polyglyceryl-10 myristate. The specific types of the above surfactants and / or emulsifiers are only examples and do not constitute any limitation to the present application.

[0087] In some embodiments, the sunscreen composition may further include: an active ingredient.

[0088] In the case where an active ingredient is included in the sunscreen composition, the present application does not particularly limit the type of the active ingredient. Exemplarily, the active ingredient may be one or more of caffeine, caffeic acid, cyclopeptide, vitamin A and its derivatives, retinol, vitamin C and its derivatives, vitamin E and its derivatives, arbutin, cinnamic acid and its derivatives, ferulic acid, ergothioneine, ectoine, glabridin, bisabolol, ceramides, phenylethyl resorcinol, soluble collagen, adenosine, 4-butylresorcinol, hydrolyzed collagen, inositol, carbohydrate isomers, fibronectin, astaxanthin, asiaticoside, rhamnose, resveratrol, amino acids, hydroxypropyldihydro-pyran-3-ol, fermentate, sodium hyaluronate, niacinamide, panthenol, plant extracts. The specific types of the above active ingredients are only examples and do not constitute any limitation to the present application.

[0089] In some embodiments, the sunscreen composition may further include: a flavoring agent.

[0090] The present application does not particularly limit the type of the flavoring agent in the embodiments. Exemplarily, the flavoring agent may be one or more of essence, eucalyptus leaf oil, cedar bark oil, lemon peel oil, palmarosa oil, bergamot fruit oil, patchouli, artemisia argyi leaf oil, jasmine flower oil. It should be noted that the specific types of the above flavoring agents are only examples and do not constitute any limitation to the present application.

[0091] In some embodiments, the sunscreen composition may further comprise: a non-oily sunscreen agent.

[0092] The present application does not particularly limit the type of the non-oily sunscreen agent. Exemplarily, the non-oily sunscreen agent may be one or more of phenylbenzimidazole sulfonic acid, titanium dioxide, zinc oxide, disodium phenyl dibenzimidazole tetrasulfonate. It should be noted that the above specific types of non-oily ones are only examples and do not constitute any limitation to the present application.

[0093] In some embodiments, the sunscreen composition may further comprise: a preservative.

[0094] Exemplarily, the preservative may be one or more of phenoxyethanol, benzyl alcohol, methylparaben, chlorphenesin, sodium benzoate. The above specific types of preservatives are only examples and do not constitute any limitation to the present application.

[0095] In some embodiments, the sunscreen composition may further comprise: a chelating agent.

[0096] The present application does not particularly limit the type of the chelating agent.

[0097] Exemplarily, the chelating agent may be one or more of EDTA-2Na, EDTA-4Na. The above specific types of chelating agents are only examples and do not constitute any limitation to the present application.

[0098] In some embodiments, the sunscreen composition may further comprise: a pH regulator.

[0099] The embodiments of the present application do not particularly limit the type of the pH regulator. Exemplarily, the pH regulator may be one or more of sodium hydroxide, potassium hydroxide, aminomethylpropanol, tromethamine, citric acid, triethanolamine. The above specific types of pH regulators are only examples and do not constitute any limitation to the present application.

[0100] Regarding the form of the sunscreen composition, the embodiments of the present application also have no special limitation. Exemplarily, the sunscreen composition may be prepared in the forms of cream, liquid, gel, powder, block, mud-like solid, wax-based with wax as the main base, freeze-dried, propellant-free spray, propellant-containing aerosol, substrate for use in combination with cosmetics, etc.

[0101] In some embodiments, the cream form may be selected from any one of milk, paste, cream, honey, fat, milk, lotion, milk, milk lotion.

[0102] In some embodiments, the liquid form may be selected from any one of lotion, liquid, water, oil, oil-water separation.

[0103] In some embodiments, the gel form may be selected from any one of gel, glue.

[0104] In some embodiments, the powder form can be selected from any one of loose powder and granules.

[0105] In some embodiments, the bulk form can be selected from any one of bulk powder and bulk solid.

[0106] In some embodiments, the lyophilized form can be selected from any one of lyophilized powder and lyophilized tablet.

[0107] In some embodiments, the form of the base material used with the cosmetics can be selected from any one of a patch and a film.

[0108] In addition, the sunscreen composition can be topically applied to the skin of different parts of the body, such as the trunk, head, face, eyes, lips, hands, feet, fingers (toes), etc.

[0109] In some embodiments, the sunscreen composition may further include at least one cosmetically acceptable adjuvant. Optionally, the adjuvant is selected from one or more of water, surfactants and / or emulsifiers, preservatives, buffers, chelating agents, denaturants, sunscreens, pH regulators, reducing agents and stabilizers, thickeners, gelling agents, film-forming polymers, fillers, matting agents, glossing agents, pigments, dyes, fragrances, and mixtures thereof.

[0110] <Method for preparing sunscreen composition>

[0111] In the second aspect, the embodiments of the present application also provide a method for preparing a sunscreen composition, which can be used to prepare the sunscreen composition described in the embodiments of the first aspect.

[0112] The method for preparing the sunscreen composition comprises the following steps S100 to S400:

[0113] S100, mixing an oil-soluble sunscreen agent, a thickener and oil to obtain a first mixture;

[0114] Specifically, in some embodiments, the sunscreen, thickener and oil can be added into an emulsifying pot at room temperature (25° C.) and mixed to obtain a first mixture.

[0115] S200, heating and stirring the first mixture at a heating temperature of 80 to 95° C. and a stirring speed of 20 to 50 r / min to obtain a second mixture.

[0116] In some embodiments, the first mixture is heated and stirred at a heating temperature of 95° C. and a stirring speed of 35 r / min until the sunscreen and the thickener are dissolved, thereby obtaining a second mixture.

[0117] S300. Perform a first homogenization treatment on the second mixture to obtain a homogenized product. The homogenization speed of the first homogenization treatment is 1000 - 3000 r / min, and the homogenization duration is 3 - 10 min.

[0118] In some embodiments, the homogenization speed of the first homogenization treatment is 3000 r / min, and the homogenization duration is 5 min.

[0119] S400. When the temperature of the homogenized product is reduced to about 55 - 63 °C, perform a second homogenization treatment to obtain the sunscreen composition. The homogenization speed of the second homogenization treatment is 3000 - 4500 r / min, and the homogenization duration is about 10 - 30 min.

[0120] Since the thickener contains trimethylol stearin, in order to better exert the thickening performance, a second homogenization treatment is required to obtain the sunscreen composition.

[0121] In some embodiments, step S400 further includes step S410:

[0122] S410. After keeping the homogenized product at a temperature for 5 - 10 min, when the temperature is reduced to about 55 - 63 °C, perform a second homogenization treatment to obtain the sunscreen composition. The homogenization speed of the second homogenization treatment is 3000 - 4500 r / min, and the homogenization duration is about 10 - 30 min.

[0123] Step S410 is beneficial to make the components of the homogenized product dissolve and disperse evenly through heat preservation.

[0124] In some embodiments, after keeping the homogenized product at a temperature for 5 min in step S410, when the temperature is reduced to about 60 °C, perform a second homogenization treatment to obtain the sunscreen composition. The homogenization speed of the second homogenization treatment is 3000 r / min, and the homogenization duration is about 10 - 30 min.

[0125] In some embodiments, the sun protection factor of the prepared sunscreen composition is greater than or equal to 73, optionally greater than or equal to 80, which is beneficial to improving the sun protection effect.

[0126] In some embodiments, the viscosity of the prepared sunscreen composition after shearing is greater than or equal to 1000 Pa·s. If the viscosity of the sunscreen composition is too small, it is easy to make the consistency too thin, approaching the state of a flowing liquid, and it is difficult to form a sunscreen film with good effect. Therefore, increasing the viscosity of the sunscreen composition after shearing is beneficial to increasing the thickness of the sunscreen film, and further improving the sun protection effect.

[0127] In some embodiments, the viscosity of the prepared sunscreen composition after shearing is greater than or equal to 2000 Pa·s, optionally greater than or equal to 5000 Pa·s. Increasing the viscosity of the sunscreen composition after shearing is more conducive to increasing the thickness of the sunscreen film, thereby enhancing the sunscreen effect.

[0128] In some embodiments, the viscosity of the prepared sunscreen composition after shearing is less than or equal to 350000 Pa·s.

[0129] In some embodiments, the viscosity of the prepared sunscreen composition before shearing is greater than or equal to 1000 Pa·s; this is conducive to increasing the thickness of the sunscreen film, thereby enhancing the sunscreen effect.

[0130] In some embodiments, the viscosity of the prepared sunscreen composition before shearing is greater than or equal to 2000 Pa·s; optionally greater than or equal to 5000 Pa·s. Preventing the sunscreen composition from being too thin in consistency is conducive to increasing the thickness of the sunscreen film, thereby enhancing the sunscreen effect.

[0131] In some embodiments, the viscosity of the prepared sunscreen composition before shearing is less than or equal to 350000 Pa·s.

[0132] In some embodiments, the viscosity change rate of the prepared sunscreen composition after shearing is less than or equal to 20%; optionally less than or equal to 18%; optionally less than or equal to 16%; optionally less than or equal to 15%; optionally less than or equal to 10%. Preventing the sunscreen composition from being too thin in consistency after shearing. The viscosity change rate is: (viscosity before shearing - viscosity after shearing) / viscosity before shearing * 100%.

[0133] In some embodiments, the prepared sunscreen composition is in the form of a cream, which is convenient for application.

[0134] <Use of the sunscreen composition>

[0135] It can be understood that the sunscreen composition provided in the first aspect of the embodiments of the present application has excellent sunscreen and skin care effects and can be applied to cosmetics.

[0136] Accordingly, the embodiments of the present application also provide a use of the sunscreen composition described in the embodiments of the first aspect in the preparation of cosmetics.

[0137] <Experiment>

[0138] <Experimental Example 1>

[0139] The following will verify the synergistic effect of trimethylol stearate and lithium magnesium aluminosilicate in the thickener through Experimental Example 1.

[0140] 1-1. Preparation of the sample to be tested

[0141] According to Example 1 and Comparative Examples 1-11, the corresponding prepared products were obtained and used as test samples for subsequent tests respectively.

[0142] Example 1

[0143] The prepared product of Example 1 is a sunscreen composition. The formula of the sunscreen composition is shown in Table 1, and the preparation method is as shown in Steps S101-S104:

[0144] S101. At room temperature (25 °C), add a sunscreen agent, a thickening agent and an oil to an emulsifying pan and mix to obtain a first mixture; the sunscreen agent is an oil-soluble sunscreen agent.

[0145] S102. Heat and stir the first mixture at a heating temperature of 95 °C and a stirring speed of 35 r / min until the sunscreen agent and the thickening agent are dissolved to obtain a second mixture.

[0146] S103. Perform a first homogenization treatment on the second mixture. After the homogenization is completed, a homogenized product is obtained; wherein, the homogenization speed of the first homogenization treatment is 3000 r / min and the homogenization duration is 5 min.

[0147] S104. Keep the homogenized product warm for 5 min. After the heat preservation is completed, when the temperature is lowered to 60 °C, perform a second homogenization treatment to obtain a sunscreen composition; wherein, the homogenization speed of the second homogenization treatment is 3000 r / min and the homogenization duration is 30 min.

[0148] Table 1. Formulas of Example 1 and Comparative Examples 1-6

[0149]

[0150]

[0151] Comparative Example 1

[0152] The prepared product of Comparative Example 1 is an oily substance, which is prepared according to the preparation method shown in S201-S202 and the formula of Comparative Example 1 in Table 1.

[0153] S201. At room temperature (25 °C), add an oil to an emulsifying pan and mix, and heat and stir at a heating temperature of 95 °C and a stirring speed of 35 r / min.

[0154] S202. After heating and stirring, perform homogenization. After the homogenization is completed, keep it warm for 5 min and then discharge to obtain an oily substance; wherein, the homogenization speed is 3000 r / min and the homogenization duration is 5 min.

[0155] Comparative Example 2

[0156] The preparation product of Comparative Example 2 is a sunscreen composition, and the formula of the sunscreen composition is shown in Table 1. The preparation method is as shown in Steps S301 to S304:

[0157] S301. Add the sunscreen agent and oil to an emulsifying pan at normal temperature (25°C) and mix to obtain a first mixture;

[0158] S302. Heat and stir the first mixture at a heating temperature of 95°C and a stirring speed of 35 r / min until the sunscreen agent and thickener are dissolved to obtain a second mixture;

[0159] S303. Perform a first homogenization treatment on the second mixture, and obtain a homogenized product after the homogenization ends; wherein, the homogenization speed of the first homogenization treatment is 3000 r / min, and the homogenization duration is 5 min;

[0160] S304. Keep the homogenized product warm for 5 min, and after the heat preservation ends, discharge to obtain the sunscreen composition.

[0161] Comparative Example 3

[0162] The preparation product of Comparative Example 3 is a sunscreen composition, and the formula of the sunscreen composition is shown in Table 1. The preparation method is as shown in Steps S401 to S404:

[0163] S401. Add the sunscreen agent, thickener and oil to an emulsifying pan at normal temperature (25°C) and mix to obtain a first mixture;

[0164] S402. Heat and stir the first mixture at a heating temperature of 95°C and a stirring speed of 35 r / min until the sunscreen agent and thickener are dissolved to obtain a second mixture;

[0165] S403. Perform a first homogenization treatment on the second mixture, and obtain a homogenized product after the homogenization ends; wherein, the homogenization speed of the first homogenization treatment is 3000 r / min, and the homogenization duration is 5 min;

[0166] S404. Keep the homogenized product warm for 5 min, and after the heat preservation ends, discharge to obtain the sunscreen composition.

[0167] Comparative Examples 4 to 5

[0168] It is basically the same as Comparative Example 3, except that the formula of the sunscreen composition is different, as specifically shown in Table 1.

[0169] It should be noted that a main reason for the different preparation methods of Comparative Examples 3, 4, and 5 from that of Example 1 is that:

[0170] The oil phase thickeners used in Comparative Examples 3, 4, and 5 have different thickening mechanisms and application processes from those of trihydroxystearin. If the same process as in Example 1 is used, the thickening efficiency of the oil phase thickeners in Comparative Examples 3, 4, and 5 will be damaged, resulting in the inability to thicken. Therefore, compared with Example 1, the preparation methods of Comparative Examples 3, 4, and 5 need to be adjusted to enable them to exert the thickening function.

[0171] Comparative Examples 6 to 11

[0172] Basically the same as Example 1, except that the formulations of the sunscreen compositions are different, as specifically shown in Table 2.

[0173] Table 2. Formulations of Comparative Examples 6 to 11

[0174]

[0175]

[0176] 1-2. Test method:

[0177] Take the prepared products of Example 1 and Comparative Examples 1 to 11 as the samples to be tested respectively, and conduct the following tests:

[0178] 1. Oil leakage situation of the samples to be tested (4-week stability experiment at 45°C)

[0179] After the samples to be tested are prepared, put the samples into a constant temperature oven at 45°C, and observe the oil leakage situation of the samples after 4 weeks.

[0180] 2. Viscosity of the samples to be tested

[0181] When the samples to be tested are prepared, immediately measure their viscosity, denoted as viscosity I;

[0182] After the samples to be tested are prepared, first apply a shear force (i.e., stir at a stirring speed of 3000 r / min for 3 min) and then measure their viscosity, denoted as viscosity II;

[0183] Viscosity I and viscosity II are measured using a Brookfield viscometer.

[0184] 3. Sunscreen index of the samples to be tested

[0185] After the samples to be tested are prepared, first apply a shear force (i.e., stir at a stirring speed of 3000 r / min for 3 min) and then measure their sunscreen index using an ultraviolet transmittance analyzer (model: SPF-290AS, Solar Light).

[0186] 1-3. Experimental results:

[0187] The experimental results are specifically shown in Table 3.

[0188] Table 3, Results of Example 1 and Comparative Examples 1-11

[0189]

[0190]

[0191] Note: The oily substance means that the whole material is in a flowing liquid state, so there is no distinction between oil leakage or not.

[0192] 1-4. Result analysis:

[0193] The formulations of Example 1 all added sunscreen agents and specific thickeners (trimethylolpropane tristearate and lithium magnesium silicate), and the viscosity II after applying shear force was very close to the viscosity I before shear. The sun protection index also reached 96, and it showed an obvious effect of inhibiting oil leakage (as Figure 4 ).

[0194] The formulation of Comparative Example 1 only contained oil, without adding sunscreen agents and thickeners. Both viscosity I and viscosity II were too low, the material was in a flowing liquid state, and there was no sun protection effect.

[0195] The formulation of Comparative Example 2 added a sunscreen agent and had a certain sun protection effect; however, both viscosity I and viscosity II were too low, the material was in a flowing liquid state, and it was difficult to form a sunscreen film with good effect.

[0196] The formulations of Comparative Example 3 and Comparative Example 6 both added sunscreen agents and thickeners, but there was only one thickener, which were polydimethylsiloxane / vinyl polydimethylsiloxane cross-linked polymer and trimethylolpropane tristearate respectively; when prepared and after preparation and stirring, although a certain viscosity could be maintained, in terms of the sun protection index, they were both much lower than that of Example 1. Among them, the sun protection index of Example 1 was about 40% higher than that of Comparative Example 6; in addition, the sun protection index of Comparative Example 3 was significantly inferior to that of Comparative Example 6, which indicated that trimethylolpropane tristearate could enhance the sun protection effect more than polydimethylsiloxane / vinyl polydimethylsiloxane cross-linked polymer.

[0197] The formulations of Comparative Example 4 and Comparative Example 5 both contained sunscreen agents and thickeners, but there was also only one thickener, which were dibutyl lauroyl glutamate and synthetic wax respectively; the gap between viscosity I before shear and viscosity II after shear was huge, indicating poor shear resistance.

[0198] The formulations of Comparative Examples 7-9 all contained two thickeners. In addition to trimethylolpropane tristearate, different thickeners such as polydimethylsiloxane / vinyl polydimethylsiloxane cross-linked polymer, dibutyl lauroyl glutamate, and synthetic wax were added respectively, but the sun protection index was basically below 75, much less than that of Example 1, and the situation of oil leakage was not significantly improved.

[0199] Physical sunscreens are also a widely used type of sunscreen. They mainly block the damage of ultraviolet rays through physical isolation, so they are also known as "isolation-type sunscreens". Comparative Example 10 and Comparative Example 11 both used physical sunscreens, namely zinc oxide. The test results of Comparative Example 10 and Comparative Example 11 showed that the sun protection factor was less than 20, far less than that of Example 1. This indicates that for physical sunscreens, using a single thickener, trihydroxystearin, or a mixed thickener including trihydroxystearin and lithium magnesium stearate dimethicone does not effectively improve the sun protection factor.

[0200] Summary:

[0201] Adding a single trihydroxystearin (as shown in Comparative Example 6) as a thickener to the sunscreen composition can make the sunscreen composition have shear resistance and significantly improve the sun protection performance of the material. However, Comparative Example 6 has an oil leakage problem (as Figure 3 ).

[0202] When adding a mixed thickener including trihydroxystearin to the sunscreen composition (as shown in Example 1 and Comparative Examples 7-9), only Example 1 achieved excellent shear resistance, sun protection factor, and anti-oil leakage effect! Different from Example 1, the oil leakage situation of Comparative Examples 7-9 was not significantly improved, and there was also a significant gap in the sun protection factor between Comparative Examples 7-9 and Example 1.

[0203] The above results show that after the combination of trihydroxystearin and lithium magnesium stearate dimethicone, a synergistic effect can be produced, comprehensively improving the shear resistance, sun protection factor, and anti-oil leakage effect of the sunscreen composition.

[0204] <Experimental Example 2>

[0205] The following will verify the influence of the contents of lithium magnesium stearate dimethicone and trihydroxystearin on the sunscreen composition through Experimental Example 2.

[0206] 2-1. Preparation of samples to be tested

[0207] Obtain the corresponding preparation products according to Examples 2-20 and Comparative Examples 12-21, and use them as samples to be tested for the tests in Experimental Example 2.

[0208] Examples 2-4 and Comparative Examples 12-13

[0209] Basically the same as Example 1, except that the formulation of the sunscreen composition is different, as shown in Table 4 specifically.

[0210] Table 4. Formulations of Examples 2-4 and Comparative Examples 12-13

[0211]

[0212]

[0213] Examples 5 to 8 and Comparative Examples 14 to 15

[0214] Basically the same as Example 1, except that the formulation of the sunscreen composition is different, as shown in Table 5 specifically.

[0215] Table 5. Formulations of Examples 5 to 8 and Comparative Examples 14 to 15

[0216]

[0217] Examples 5 to 8 and Comparative Examples 14 to 15

[0218] Basically the same as Example 1, except that the formulation of the sunscreen composition is different, as shown in Table 6 specifically.

[0219] Table 6. Formulations of Examples 5 to 8 and Comparative Examples 14 to 15

[0220]

[0221]

[0222] Examples 13 to 16 and Comparative Examples 18 to 19

[0223] Basically the same as Example 1, except that the formulation of the sunscreen composition is different, as shown in Table 7 specifically.

[0224] Table 7. Formulations of Examples 13 to 16 and Comparative Examples 18 to 19

[0225]

[0226] Examples 17 to 16 and Comparative Examples 18 to 19

[0227] Basically the same as Example 1, except that the formulation of the sunscreen composition is different, as shown in Table 8 specifically.

[0228] Table 8. Formulations of Examples 17 to 16 and Comparative Examples 18 to 19

[0229]

[0230] 2-2. Test method:

[0231] Take the prepared products of Example 1 and Comparative Examples 1 to 11 respectively as the samples to be tested, and conduct the following tests:

[0232] 1. Oil leakage situation of the samples to be tested (4-week experiment of stability at 45°C)

[0233] After the samples to be tested are prepared, put the samples into a constant temperature oven at 45°C, and observe the oil leakage situation of the samples after 4 weeks.

[0234] 2. Viscosity of the sample to be tested

[0235] When the sample to be tested is prepared, immediately measure its viscosity, denoted as Viscosity I;

[0236] After the sample to be tested is prepared, first apply a shear force (i.e., stir at a stirring speed of 3000 r / min for 3 min) and then measure its viscosity, denoted as Viscosity II;

[0237] Viscosity I and Viscosity II are measured using a Brookfield viscometer.

[0238] 3. Sun protection index of the sample to be tested

[0239] After the sample to be tested is prepared, first apply a shear force (i.e., stir at a stirring speed of 3000 r / min for 3 min) and then measure its sun protection index using an ultraviolet transmittance analyzer (SPF-290AS, Solar Light).

[0240] 2-3. Experimental results:

[0241] The experimental results are shown in Tables 9 to 13

[0242] Table 9. Results of Examples 2 to 4 and Comparative Examples 12 to 13

[0243]

[0244]

[0245] Table 10. Results of Examples 5 to 8 and Comparative Examples 14 to 15

[0246]

[0247] Table 11. Results of Examples 9 to 12 and Comparative Examples 16 to 17

[0248]

[0249] Table 12. Results of Examples 13 to 16 and Comparative Examples 18 to 19

[0250]

[0251] Table 13. Results of Examples 17 to 20 and Comparative Examples 20 to 21

[0252]

[0253]

[0254] 2-4. Result analysis

[0255] It can be seen from the results of Comparative Examples 12 to 21 that the sun protection index is relatively low.

[0256] The above results show that not in any proportion can the combination of trihydroxystearin and lithium dimethyldistearylammonium montmorillonite play the roles of anti-shearing, preventing oil leakage, and increasing the sun protection index.

[0257] When the mass fraction of the mixed thickener is 6-10%, and the mass fraction of trihydroxystearin in the mixed thickener is 3-6%, and the mass fraction of lithium dimethyldistearylammonium montmorillonite is not less than 1%, the above-mentioned effects of anti-shearing, preventing oil leakage, and increasing the sun protection index can be achieved simultaneously.

[0258] <Experimental Example 3>

[0259] The following will verify the influence of the type of oil on the sun protection composition through Experimental Example 3.

[0260] 3-1. Preparation of samples to be tested

[0261] Obtain the corresponding preparation products according to Examples 21 to 26, and use them as samples to be tested for the tests in Experimental Example 2 respectively.

[0262] Examples 21 to 26

[0263] Basically the same as Example 1, the difference is that different types of oils are selected in the formula of the sun protection composition, as shown in Table 14 specifically.

[0264] Table 14. Formulas of Examples 21 to 26

[0265]

[0266]

[0267] 3-2. Test method:

[0268] Take the preparation products of Example 1 and Comparative Examples 1 to 11 as samples to be tested respectively, and conduct the following tests:

[0269] 1. Oil leakage situation of the sample to be tested (4-week stability experiment at 45°C)

[0270] After the sample to be tested is prepared, put the sample into an oven at a constant temperature of 45°C, and observe the oil leakage situation of the sample after 4 weeks.

[0271] 2. Viscosity of the sample to be tested

[0272] When the sample to be tested is prepared, immediately measure its viscosity, and record it as viscosity I;

[0273] After the preparation of the sample to be tested is completed, first apply a shear force (i.e., stir at a stirring speed of 3000 r / min for 3 min), and then measure its viscosity, denoted as viscosity II;

[0274] Viscosity I and viscosity II are measured using a Brookfield viscometer.

[0275] 3. Sun protection index of the sample to be tested

[0276] After the preparation of the sample to be tested is completed, first apply a shear force (i.e., stir at a stirring speed of 3000 r / min for 3 min), and then measure its sun protection index using an ultraviolet transmittance analyzer (SPF-290AS, Solar Light).

[0277] 3-3. Experimental results:

[0278] The experimental results are shown in Table 15.

[0279] Table 15. Results of Examples 21 to 26

[0280]

[0281]

[0282] 3-4. Result analysis

[0283] Analysis of the experimental results shows that:

[0284] The type of oil has little effect on the technical effects claimed in the embodiments of the present application.

[0285] <Experimental Example 4>

[0286] The performance of the sunscreen composition will be further verified through Experimental Example 4 below.

[0287] 4-1. Preparation of the sample to be tested

[0288] Obtain the corresponding preparation product according to Example 27 as the sample to be tested for the test in Experimental Example 4.

[0289] Example 27

[0290] Basically the same as Example 1, except that the formulation of the sunscreen composition is different, as shown in Table 16 specifically.

[0291] Table 16. Formulation of Example 27

[0292]

[0293] 4-2. Test method

[0294] Treat pig skin with the sample to be tested, and record the surface topography and three-dimensional data of the skin before and after treatment for comparison. The specific method is as follows:

[0295] Take the pig skin stored at -20°C, wait for 15 min at room temperature to restore the pig skin to room temperature, blot the moisture on the surface of the pig skin with absorbent paper, mark four black dots on the surface of the pig skin, and use the area enclosed by the four black dots as the marked area;

[0296] Use a Keyence profiler (instrument model: VK-X110) to measure the three-dimensional profile of the surface of the marked area and the three-dimensional data corresponding to the three-dimensional profile. Record the measured three-dimensional profile as the surface topography of the skin before treatment, and record the measured three-dimensional data as the three-dimensional data of the skin before treatment (including Ra, Rz, and Ry before treatment); After shaking the sample evenly, measure 10 mg and drop it outside the marked area, smear it in the same direction onto the marked area, and completely cover the marked area; Apply the sample to be tested evenly so that the sample is evenly dispersed and covers the marked area, and let it stand for 15 min. After the sample dries into a film, use a Keyence profiler (instrument model: VK-X110) to measure the three-dimensional profile of the surface of the marked area and the three-dimensional data corresponding to the three-dimensional profile again. Record the measured three-dimensional profile as the surface topography of the skin after treatment, and record the measured three-dimensional data as the three-dimensional data of the skin after treatment (including Ra, Rz, and Ry after treatment);

[0297] Among them:

[0298] Ra refers to the arithmetic mean roughness of the surface of the marked area, which represents the arithmetic mean of the absolute values of the surface profile offsets within the sampling length L (the length of the marked area); in short, it reflects the average degree of surface height fluctuation; the smaller the Ra value, the smoother the surface; the larger the value, the rougher the surface;

[0299] Rz refers to the ten-point height roughness of the surface of the marked area, which represents the sum of the average values of the 5 largest peak heights and 5 largest valley depths of the surface profile of the skin within the sampling length L (the length of the marked area); that is to say, Rz comprehensively reflects the extreme peaks and valleys of the surface profile; the larger the Rz value, the more obvious the surface roughness and the higher the degree of surface unevenness;

[0300] Ry refers to the maximum profile height of the surface of the marked area, which represents the distance between the highest peak and the lowest valley of the surface profile of the skin within the sampling length L (the length of the marked area); the larger the Ry value, the greater the surface undulation and the more serious the degree of surface unevenness;

[0301] Ra mainly measures the average degree of surface profile fluctuations. The smaller it is, the smoother the surface. Rz takes into account the height difference between the maximum peak and valley, and can more specifically reflect the situation of surface extreme values. Ry focuses on the maximum undulation height within the entire sampling interval, emphasizing the overall roughness of the surface. These three are usually used together to evaluate the surface roughness.

[0302] 4-3. Experimental results

[0303] The experimental results are shown in Table 17, Figure 5 and Figure 6 .

[0304] Figure 5 Fig. is a schematic diagram of the skin surface topography before treatment in Experimental Example 4.

[0305] Figure 6 Fig. is a schematic diagram of the skin surface topography after treatment in Experimental Example 4.

[0306] Table 17. Skin three-dimensional data

[0307] Ra Ry Rz Three-dimensional skin data before processing 9.434um 85.291um 31.555um Three-dimensional skin data after processing 8.903um 78.231um 20.182um

[0308] 4-4. Result analysis

[0309] According to the experimental results, before and after using the test sample of Embodiment 27 of the present application, the surface roughness of the skin changed little, indicating that the test sample can fit well with the skin and will not form the Figure 1 shown state. Further explanation, when using trihydroxystearin combined with lithium magnesium aluminosilicate dimethyldistearylammonium for sunscreen, the sunscreen product forms a sunscreen film with a certain thickness and uniform distribution on the skin, which can solve the problem that the protruding areas on the skin cannot be effectively covered and protected by the sunscreen agent.

[0310] The above specific embodiments have described the present invention in detail, but these do not constitute limitations on the present invention. The protection scope of the present invention is not limited to the above embodiments. Any equivalent modifications or changes made by those of ordinary skill in the art according to the content disclosed by the present invention shall be included in the protection scope recorded in the claims.

Claims

1. A sunscreen composition, characterized in that, Comprising: An oil-soluble sunscreen agent, with the mass fraction of the oil-soluble sunscreen agent being 0.001 - 65%; A thickening agent, the thickening agent including trimethylol stearin and lithium magnesium stearate dimethicone, the mass fraction of the thickening agent being 6 - 10%, the mass fraction of trimethylol stearin being 3 - 6%, and the mass fraction of lithium magnesium stearate dimethicone being not less than 1%; and An oil.

2. Preparation method of a sunscreen composition, characterized in that, Comprising: Mixing the oil-soluble sunscreen agent, the thickening agent and the oil to obtain a first mixture; wherein, the mass fraction of the oil-soluble sunscreen agent is 0.001 - 65%; the mass fraction of the thickening agent is 6 - 10%, the thickening agent includes trimethylol stearin and lithium magnesium stearate dimethicone, the mass fraction of trimethylol stearin is 3 - 6%, and the mass fraction of lithium magnesium stearate dimethicone is not less than 1%; Heating and stirring the first mixture under the conditions of a heating temperature of 80 - 95°C and a stirring speed of 20 - 50 r / min to obtain a second mixture; Performing a first homogenization treatment on the second mixture to obtain a homogenized product; wherein, the homogenization speed of the first homogenization treatment is 1000 - 3000 r / min, and the homogenization duration is 3 - 10 min; Lowering the temperature of the homogenized product to 55 - 63°C and performing a second homogenization treatment to obtain the sunscreen composition; wherein, the homogenization speed of the second homogenization treatment is 3000 - 4500 r / min, and the homogenization duration is 10 - 30 min.

3. The method for preparing the sunscreen composition according to claim 2, wherein Lowering the temperature of the homogenized product to 55 - 63°C; comprising: After keeping the homogenized product at a constant temperature for 5 - 10 min, cooling it to 55 - 63°C.

4. The method for preparing the sunscreen composition according to claim 2, wherein The oil-soluble sunscreen agent is selected from one or more of ethylhexyl methoxycinnamate, octocrylene, diethylamino hydroxybenzoyl hexyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, and ethylhexyl triazone, polysiloxane-15, isoamyl p-methoxycinnamate, homosalate, diethylhexyl butamido triazone, butyl methoxydibenzoylmethane, and cresol triazole trisiloxane; The mass fraction of the thickening agent is 6%, the mass fraction of lithium magnesium stearate dimethicone is 1 - 3%, and the mass fraction of trimethylol stearin is 3 - 5%; or The mass fraction of the thickening agent is 7%, the mass fraction of lithium magnesium stearate dimethicone is 1 - 4%, and the mass fraction of trimethylol stearin is 3 - 6%; or The mass fraction of the thickening agent is 8%, the mass fraction of lithium magnesium stearate dimethicone is 2 - 5%, and the mass fraction of trimethylol stearin is 3 - 6%; or The mass fraction of the thickening agent is 9%, the mass fraction of lithium magnesium stearate dimethicone is 3 - 6%, and the mass fraction of trimethylol stearin is 3 - 6%; or The mass fraction of the thickening agent is 10%, the mass fraction of lithium magnesium stearate dimethicone is 4 - 7%, and the mass fraction of trimethylol stearin is 3 - 6%.

5. The method for preparing the sunscreen composition according to claim 2, wherein The oil-soluble sunscreen agents include ethylhexyl methoxycinnamate, octocrylene, diethylamino hydroxybenzoyl hexyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine and ethylhexyl triazone.

6. The preparation method of the sunscreen composition according to claim 5, wherein the mass fraction of ethylhexyl methoxycinnamate is 7-11%; the mass fraction of octocrylene is 7-11%; the mass fraction of diethylamino hydroxybenzoyl hexyl benzoate is 1-5%; the mass fraction of bis-ethylhexyloxyphenol methoxyphenyl triazine is 1-6%; the mass fraction of ethylhexyl triazone is 1-4%.

7. The preparation method of the sunscreen composition according to claim 5, wherein the oil is selected from one or more of pentaerythrityl tetra(ethylhexanoate), caprylic / capric triglyceride, tocopherol (vitamin E), dibutyl adipate, dicaprylyl carbonate, Limnanthes alba seed oil, hydrogenated polyisobutene, tocopheryl acetate, diisostearyl dimer dilinoleate, triolein, cetyl ethylhexanoate; the content of the oil is the balance; the mass fraction of the oil-soluble sunscreen agent is 26%; among them, the mass fraction of ethylhexyl methoxycinnamate is 9%; the mass fraction of octocrylene is 9%; the mass fraction of diethylamino hydroxybenzoyl hexyl benzoate is 4%; the mass fraction of bis-ethylhexyloxyphenol methoxyphenyl triazine is 2%; the mass fraction of ethylhexyl triazone is 2%; or the mass fraction of the oil-soluble sunscreen agent is 27%; among them, the mass fraction of ethylhexyl methoxycinnamate is 9%; the mass fraction of octocrylene is 8%; the mass fraction of diethylamino hydroxybenzoyl hexyl benzoate is 4%; the mass fraction of bis-ethylhexyloxyphenol methoxyphenyl triazine is 4%; the mass fraction of ethylhexyl triazone is 2%.

8. The preparation method of the sunscreen composition includes: mixing the oil-soluble sunscreen agent, thickener and oil at room temperature to obtain a first mixture; wherein, the mass fraction of the oil-soluble sunscreen agent is 0.001-65%; the mass fraction of the thickener is 6-10%, the thickener includes trimethylolpropane tristearate and lithium magnesium silicate, the mass fraction of trimethylolpropane tristearate is 3-6%, and the mass fraction of lithium magnesium silicate is not less than 1%; heating and stirring the first mixture under the conditions of a heating temperature of 95 °C and a stirring speed of 35 r / min until the oil-soluble sunscreen agent and the thickener are dissolved to obtain a second mixture; performing a first homogenization treatment on the second mixture, and obtaining a homogenized product after the homogenization ends; wherein, the homogenization speed of the first homogenization treatment is 3000 r / min, and the homogenization duration is 5 min; keeping the homogenized product at a temperature for 5 min, and after the heat preservation ends, cooling to 60 °C and performing a second homogenization treatment to obtain the sunscreen composition; wherein, the homogenization speed of the second homogenization treatment is 3000 r / min, and the homogenization duration is 30 min.

9. The sunscreen composition prepared by the preparation method of the sunscreen composition according to any one of claims 2-8.

10. The use of the sunscreen composition according to claim 1 or 9 in the preparation of cosmetics.

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