A highly waterproof sunscreen and its preparation method

Abstract

This invention provides a highly waterproof sunscreen and its preparation method. By specifically selecting the type and combination of thickening gel composition and emulsifier, along with other ingredients, and combining this invention with a specific preparation method for the thickening gel composition, the resulting sunscreen not only possesses excellent stability and sensory experience, but also blocks light in the 280–500 nm wavelength range while exhibiting strong waterproof performance, maintaining excellent sun protection even when the user is swimming or sweating.

Description

Technical Field

[0001] This invention belongs to the field of cosmetic technology. More specifically, it relates to a highly waterproof sunscreen and its preparation method. Background Technology

[0002] With increasing awareness of sun protection, more and more people are applying sunscreen products during outdoor activities. However, in outdoor settings, sweat, seawater, or pool water can dilute sunscreen, reducing its effectiveness and requiring frequent reapplication, which is inconvenient. This is one of the main pain points for people using sunscreen. Therefore, improving the water resistance of sunscreen products, so that they can still provide optimal sun protection even when users are swimming or sweating, is crucial for the cosmetics industry.

[0003] Currently, sunscreen products on the market typically include thickeners, emulsifiers, and film-forming agents simultaneously. These agents stabilize the emulsion structure and enhance film-forming properties, thereby improving the waterproof performance of sunscreens. However, the addition of film-forming agents can easily lead to a sticky and unpleasant sensory experience. Therefore, developing a sunscreen product that offers both superior waterproof performance and a pleasant sensory experience is essential. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies by providing a sunscreen that, through specific selection of thickeners, emulsifiers, and other ingredients, and with the aid of a specific gelling method for the thickeners, not only eliminates the need for film-forming agents, ensuring an excellent sensory experience, but also possesses strong waterproof properties, maintaining good sun protection efficacy even when the user is swimming or sweating.

[0005] The primary objective of this invention is to provide a sunscreen.

[0006] A second objective of this invention is to provide a method for preparing the aforementioned sunscreen.

[0007] The above-mentioned objective of this invention is achieved through the following technical solution:

[0008] This invention provides a sunscreen comprising the following components in the indicated weight percentages: 18%–29% sunscreen agent, 7.3%–13.5% thickening gel composition, 0.01%–1% plant-derived sunscreen ingredient, 3%–5% emulsifier, 6%–10% emollient, 1%–4% skin feel modifier, 5.05%–11% moisturizer, 0.5%–1.5% stabilizer, and water to make up to 100%.

[0009] The thickening gel composition is a mixture of thickener 1, thickener 2, oil solvent 1, and oil solvent 2, wherein the mass percentages of thickener 1, thickener 2, oil solvent 1, and oil solvent 2 in the sunscreen are 0.8%–1.5%, 0.5%–1%, 4%–6%, and 2%–5%, respectively; thickener 1 is trihydroxystearin; thickener 2 is at least one of distearate dimethylammonium lithium montmorillonite and quaternary ammonium salt-18 bentonite; oil solvent 1 is at least one of caprylic / capric triglyceride, pentaerythritol tetracoedate, and coconut oil alcohol-caprylate / capric acid ester; oil solvent 2 is at least one of isohexadecane and hydrogenated polydecene; the preparation method of the thickening gel composition is as follows: thickener 1, oil solvent 1, and oil solvent 2 are mixed until the system is transparent, then thickener 2 is added, and shearing is performed until a gel is formed;

[0010] The emulsifier is a mixture of emulsifier 1 and emulsifier 2, and the mass percentages of emulsifier 1 and emulsifier 2 in the sunscreen are 1.5%–2.5% and 1.5%–2.5%, respectively; emulsifier 1 is at least one of polyglycerol-2 stearate, polyglycerol-4 oleate, polyglycerol-6 oleate, and polyglycerol-6 polyricinoleate; emulsifier 2 is at least one of PEG-30 dihydroxystearate, sorbitan sesquioleate, and sorbitan isostearate.

[0011] This invention, through the specific selection of thickening gel compositions, emulsifiers, and their combinations, supplemented with other ingredients and a specific preparation method for the thickening gel composition, yields a sunscreen that not only possesses excellent stability and sensory experience but also exhibits strong water resistance while blocking light in the 280–500 nm wavelength range. It maintains excellent sun protection even when the user is swimming or sweating. Furthermore, compared to thickening gel compositions prepared using other thickening gel compositions, emulsifiers, or other methods, the sunscreen of this invention exhibits superior stability, sensory experience, and water resistance, thus providing better sun protection.

[0012] Preferably, the sunscreen agent is a mixture of UVA sunscreen agent, UVB sunscreen agent, and physical sunscreen agent; and the mass percentages of UVA sunscreen agent, UVB sunscreen agent, and physical sunscreen agent in the sunscreen are 3%–7%, 12%–14%, and 3%–8%, respectively.

[0013] More preferably, the UVA sunscreen agent is at least two of the following: diethylamino hydroxybenzoyl hexyl benzoate (oil-soluble), bis-ethylhexyloxyphenol methoxyphenyl triazine (oil-soluble), and terephthalic acid dicamphor sulfonic acid (water-soluble), and the mass percentages of diethylamino hydroxybenzoyl hexyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, and terephthalic acid dicamphor sulfonic acid in the sunscreen are 2%–4%, 1%–2%, and 0–1%, respectively.

[0014] More preferably, the UVB sunscreen agent is at least two of the following: homosalate (oil-soluble), ethylhexyl salicylate (oil-soluble), ethylhexyl methoxycinnamate (oil-soluble), isoamyl p-methoxycinnamate (oil-soluble), and phenylbenzimidazole sulfonic acid (water-soluble), and the mass percentages of homosalate, ethylhexyl salicylate, ethylhexyl methoxycinnamate, isoamyl p-methoxycinnamate, and phenylbenzimidazole sulfonic acid in the sunscreen are 0-9%, 0-5%, 0-9%, 0-9%, and 3-5%, respectively.

[0015] More preferably, the physical sunscreen agent is a mixture of titanium dioxide and zinc oxide, and the mass percentages of titanium dioxide and zinc oxide in the sunscreen are 2%–4% and 1%–4%, respectively.

[0016] This invention, by specifically selecting the types and combinations of sunscreen agents and supplementing them with other ingredients, produces a sunscreen with higher SPF and PFA values, achieving highly efficient protection against the entire spectrum of ultraviolet rays (280–400 nm) and providing better sun protection efficacy.

[0017] Furthermore, the average particle size of the titanium dioxide is ≤200 nm.

[0018] Furthermore, the average particle size of the zinc oxide is ≤200 nm.

[0019] Preferably, the plant-derived sunscreen ingredient is at least one of osmanthus flower extract, coptis extract, and wild rose fruit oil.

[0020] Sunlight consists of three parts: ultraviolet light, visible light, and infrared light. Among them, UVA (280-320 nm) and UVB (320-400 nm) in ultraviolet light, as well as the blue light band (400-500 nm) in visible light, can penetrate the skin and cause damage to human skin. This invention, through the specific selection of plant-derived sunscreen ingredients and physical sunscreen agents, supplemented with other ingredients, can significantly improve the anti-blue light performance of sunscreen, achieve highly efficient defense against light in the 280-500 nm band, and better reduce the damage of sunlight to human skin.

[0021] Preferably, the emollient is at least one of isododecane and hydrogenated polyisobutylene.

[0022] Preferably, the skin feel modifier is at least one of silica, polymethylsilsesquioxane, and aluminum starch octenyl succinate.

[0023] Preferably, the moisturizer is a mixture of moisturizer 1 and moisturizer 2, and the mass percentages of moisturizer 1 and moisturizer 2 in the sunscreen are 5% to 10% and 0.05% to 1%, respectively; moisturizer 1 is at least one of glycerin, 1,3-propanediol and butylene glycol, and moisturizer 2 is at least one of betaine, sodium hyaluronate and trehalose.

[0024] Preferably, the stabilizer is sodium chloride.

[0025] Preferably, the preparation process of the thickening gel composition is carried out at 65–75 °C.

[0026] Preferably, the shearing rotation speed is 800-1000 rpm.

[0027] Preferably, the shearing time is 20 to 30 minutes.

[0028] As an optional implementation, the sunscreen comprises the following components in weight percentages: 18%–29% sunscreen agent, 7.3%–13.5% thickening gel composition, 0.01%–1% plant-derived sunscreen ingredient, 3%–5% emulsifier, 6%–10% emollient, 1%–4% skin feel modifier, 5.05%–11% moisturizer, 0.5%–1.5% stabilizer, 0.8%–1.0% preservative, and water to make up to 100%.

[0029] Preferably, the preservative is a mixture of phenoxyethanol and ethylhexylglycerin, and the mass percentages of phenoxyethanol and ethylhexylglycerin in the sunscreen are 0.68%–0.72% and 0.18%–0.22%, respectively.

[0030] As an optional implementation, the sunscreen comprises the following components in weight percentages: 18%–29% sunscreen agent, 7.3%–13.5% thickening gel composition, 0.01%–1% plant-derived sunscreen ingredient, 3%–5% emulsifier, 6%–10% emollient, 1%–4% skin feel modifier, 5.05%–11% moisturizer, 0.5%–1.5% stabilizer, 0.05%–0.3% fragrance, and water to make up to 100%.

[0031] As an optional implementation, the sunscreen comprises the following components in weight percentages: 18%–29% sunscreen agent, 7.3%–13.5% thickening gel composition, 0.01%–1% plant-derived sunscreen ingredient, 3%–5% emulsifier, 6%–10% emollient, 1%–4% skin feel modifier, 5.05%–11% moisturizer, 0.5%–1.5% stabilizer, 0.8%–1.0% preservative, 0.05%–0.3% fragrance, and water to make up to 100%.

[0032] Preferably, the preservative is a mixture of phenoxyethanol and ethylhexylglycerin, and the mass percentages of phenoxyethanol and ethylhexylglycerin in the sunscreen are 0.68%–0.72% and 0.18%–0.22%, respectively.

[0033] Based on this, the present invention also provides a method for preparing the above-mentioned sunscreen, comprising the following steps:

[0034] S1. Aqueous phase: Add water-soluble UVA sunscreen, water-soluble UVB sunscreen, moisturizer, and stabilizer to water, mix well, and adjust the pH to 7.2-7.8;

[0035] S2. Oil phase: Dissolve oil-soluble UVA sunscreen and oil-soluble UVB sunscreen at 60-80 ℃ until transparent, then add emulsifier and emollient and dissolve until transparent, then add physical sunscreen, thickening gel composition and skin feel modifier and homogenize until the material is uniform;

[0036] S3. Adjust the temperature of the aqueous phase and oil phase to 60-65 ℃, mix the aqueous phase and oil phase evenly, homogenize once, add plant-derived sunscreen ingredients, optional preservatives, and optional fragrances, mix evenly, homogenize a second time, and defoam to obtain the final product.

[0037] Preferably, the pH in S1 is adjusted by a pH adjuster, such as at least one of sodium hydroxide, arginine, and tromethamine.

[0038] Preferably, in step S1, the pH is adjusted while the system is stirred until it becomes transparent, for example, by stirring at 500–800 rpm.

[0039] Preferably, the rotational speed of the homogenizer in S2 is 6000-8000 rpm.

[0040] Preferably, the method for mixing the aqueous phase and the oil phase in S3 is as follows: the oil phase is kept rotating, and the aqueous phase is added at a speed at which no water accumulates on the surface of the oil phase, and the rotation continues for 4 to 6 minutes.

[0041] More preferably, the rotation is achieved by stirring, such as stirring at 530–600 rpm.

[0042] Preferably, the homogenization described in S3 is a segmented homogenization, such as homogenizing at 5000-7000 rpm for 2.5-3.5 min, and then homogenizing at 8000-12000 rpm for 2.5-3.5 min.

[0043] Preferably, the addition of plant-derived sunscreen ingredients, optional preservatives, and optional fragrances in step S3 is achieved by stirring, such as stirring at 300–400 rpm.

[0044] Preferably, the secondary homogenization in S3 is homogenization at 8000-12000 rpm for 1.5-2.5 min.

[0045] Preferably, the degassing in S3 is achieved by evacuating the system.

[0046] The present invention has the following beneficial effects:

[0047] This invention, through the specific selection of thickening gel composition, types and combinations of emulsifiers, supplemented with other ingredients, and combined with a specific preparation method for the thickening gel composition, yields a sunscreen that not only has excellent stability and sensory experience, but also has strong waterproof performance while blocking light in the 280-500 nm wavelength band, and can still provide good sun protection even when the user is swimming or sweating. Attached Figure Description

[0048] Figure 1 The absorption curve of the sunscreen obtained in Example 1 is shown in the range of 400–500 nm.

[0049] Figure 2 The absorption curve of the sunscreen obtained in Example 3 is shown in the range of 400–500 nm.

[0050] Figure 3 The absorption curve of the sunscreen obtained in Example 7 is shown in the range of 400–500 nm.

[0051] Figure 4 The absorption curves of the control sample are shown in the range of 400–500 nm. Detailed Implementation

[0052] The present invention will be further illustrated below with reference to specific embodiments, but the embodiments do not limit the present invention in any way. Unless otherwise specified, the reagents, methods, and equipment used in the present invention are conventional reagents, methods, and equipment in this technical field.

[0053] Unless otherwise specified, all reagents and materials used in the following examples are commercially available.

[0054] Example 1: A sunscreen

[0055] I. Preparation of Thickening Gel Composition

[0056] At 70 °C, thickener 1, oil solvent 1, and oil solvent 2 are mixed until the system is transparent. Then, thickener 2 is added, and the mixture is sheared at 900 rpm for 25 min (at which point gelation occurs) to obtain the thickened gel composition.

[0057] II. Sunscreen contains the following components by weight percentage.

[0058] UVA sunscreen agents: 3% diethylamino hydroxybenzoyl hexyl benzoate, 1.5% bis-ethylhexyloxyphenol methoxyphenyl triazine, and 0.5% terephthalomethyl dicamphor sulfonic acid.

[0059] UVB sunscreen agents: 2% ethylhexyl salicylate, 4% isoamyl p-methoxycinnamate, and 4% phenylbenzimidazole sulfonic acid.

[0060] Physical sunscreen agents: 3% titanium dioxide, 3% zinc oxide; average particle size of titanium dioxide ≤200 nm; average particle size of zinc oxide ≤200 nm.

[0061] Thickener 1: 1% trihydroxystearin.

[0062] Thickener 2: Distearate, lithium dimethylammonium montmorillonite 0.8%.

[0063] Oil solvent 1: Caprylic / Capric triglyceride 3%, Cocoyl alcohol-caprylate / capric acid ester 2%.

[0064] Oil solvent 2: 2% isohexadecane, 2% hydrogenated polydecene.

[0065] Plant-derived sunscreen ingredients: Osmanthus flower extract 0.5%, Coptis chinensis extract 0.05%.

[0066] Emulsifier 1: 0.5% polyglycerol-2 stearate and 1.5% polyglycerol-6 polyricinoleate.

[0067] Emulsifier 2: PEG-30 dihydroxystearate 1%, sorbitan isostearate 0.5%.

[0068] Emollients: 4% isododecane, 4% hydrogenated polyisobutylene.

[0069] Skin feel modifiers: 1% silica, 0.5% polymethylsilsesquioxane.

[0070] Moisturizer 1: 2% glycerin, 4% 1,3-propanediol, and 2% butylene glycol.

[0071] Moisturizer 2: Betaine 0.2%, Sodium Hyaluronate 0.05%, Trehalose 0.2%.

[0072] Stabilizer: 1% sodium chloride.

[0073] Replenish water to 100%.

[0074] III. Preparation of Sunscreen

[0075] S1. Aqueous phase: Add water-soluble UVA sunscreen, water-soluble UVB sunscreen, moisturizer, and stabilizer to water, mix well, adjust the pH to 7.5 with sodium hydroxide while stirring at 600 rpm until the system becomes transparent;

[0076] S2. Oil phase: Dissolve oil-soluble UVA sunscreen and oil-soluble UVB sunscreen at 70 ℃ until transparent, then add emulsifier and emollient and dissolve until transparent, then add physical sunscreen, thickening gel composition and skin feel modifier, and homogenize at 8000 rpm until the material is uniform;

[0077] S3. Adjust the temperature of the aqueous phase and oil phase to 65 ℃, keep the oil phase stirring at 580 rpm, add the aqueous phase at a speed that prevents water accumulation on the surface of the oil phase, continue stirring at 580 rpm for 5 min, homogenize at 6000 rpm for 3 min, then homogenize at 10000 rpm for 3 min, add the plant-derived sunscreen ingredients, mix at 350 rpm, then homogenize at 10000 rpm for 2 min, and finally degas under vacuum to obtain the final product.

[0078] Example 2: A sunscreen

[0079] I. Preparation of Thickening Gel Composition

[0080] Same as Example 1.

[0081] II. Sunscreen contains the following components by weight percentage.

[0082] UVA sunscreen agents: 3% diethylamino hydroxybenzoyl hexyl benzoate, 1.5% bis-ethylhexyloxyphenol methoxyphenyl triazine, and 0.5% terephthalomethyl dicamphor sulfonic acid.

[0083] UVB sunscreen agents: 2% ethylhexyl salicylate, 4% isoamyl p-methoxycinnamate, and 4% phenylbenzimidazole sulfonic acid.

[0084] Physical sunscreen agents: 3% titanium dioxide, 3% zinc oxide; average particle size of titanium dioxide ≤200 nm; average particle size of zinc oxide ≤200 nm.

[0085] Thickener 1: 1% trihydroxystearin.

[0086] Thickener 2: Distearate, lithium dimethylammonium montmorillonite 0.8%.

[0087] Oil solvent 1: Caprylic / Capric triglyceride 3%, Cocoyl alcohol-caprylate / capric acid ester 2%.

[0088] Oil solvent 2: 2% isohexadecane, 2% hydrogenated polydecene.

[0089] Plant-derived sunscreen ingredients: Osmanthus flower extract 0.5%, Coptis chinensis extract 0.05%.

[0090] Emulsifier 1: 0.5% polyglycerol-2 stearate and 1.5% polyglycerol-6 polyricinoleate.

[0091] Emulsifier 2: PEG-30 dihydroxystearate 1%, sorbitan isostearate 0.5%.

[0092] Emollients: 4% isododecane, 4% hydrogenated polyisobutylene.

[0093] Skin feel modifiers: 1% silica, 0.5% polymethylsilsesquioxane.

[0094] Moisturizer 1: 2% glycerin, 4% 1,3-propanediol, and 2% butylene glycol.

[0095] Moisturizer 2: Betaine 0.2%, Sodium Hyaluronate 0.05%, Trehalose 0.2%.

[0096] Stabilizer: 1% sodium chloride.

[0097] Preservatives: phenoxyethanol 0.7%, ethylhexylglycerin 0.2%.

[0098] Fragrance: 0.2%.

[0099] Replenish water to 100%.

[0100] III. Preparation of Sunscreen

[0101] S1. Aqueous phase: Add water-soluble UVA sunscreen, water-soluble UVB sunscreen, moisturizer, and stabilizer to water, mix well, adjust the pH to 7.5 with sodium hydroxide while stirring at 600 rpm until the system becomes transparent;

[0102] S2. Oil phase: Dissolve oil-soluble UVA sunscreen and oil-soluble UVB sunscreen at 70 ℃ until transparent, then add emulsifier and emollient and dissolve until transparent, then add physical sunscreen, thickening gel composition and skin feel modifier, and homogenize at 8000 rpm until the material is uniform;

[0103] S3. Adjust the temperature of the aqueous phase and oil phase to 65 ℃, keep the oil phase stirring at 580 rpm, add the aqueous phase at a speed that prevents water accumulation on the surface of the oil phase, continue stirring at 580 rpm for 5 min, homogenize at 6000 rpm for 3 min, then homogenize at 10000 rpm for 3 min, add the plant-derived sunscreen ingredients, preservatives, and fragrance, mix at 350 rpm, then homogenize at 10000 rpm for 2 min, and finally degas under vacuum to obtain the final product.

[0104] Example 3: A sunscreen

[0105] I. Preparation of Thickening Gel Composition

[0106] At 65 °C, thickener 1, oil solvent 1, and oil solvent 2 are mixed until the system is transparent. Then, thickener 2 is added, and the mixture is sheared at 1000 rpm for 30 min (at which point gelation occurs) to obtain the thickened gel composition.

[0107] II. Sunscreen contains the following components by weight percentage.

[0108] UVA sunscreen agents: 4% diethylamino hydroxybenzoyl hexyl benzoate, 2% bis-ethylhexyloxyphenol methoxyphenyl triazine, and 1% terephthalomethyl dicamphor sulfonic acid.

[0109] UVB sunscreen agents: 9% homosalate, 5% phenylbenzimidazole sulfonic acid.

[0110] Physical sunscreen agents: 4% titanium dioxide, 4% zinc oxide; average particle size of titanium dioxide ≤200 nm; average particle size of zinc oxide ≤200 nm.

[0111] Thickener 1: 1.5% trihydroxystearin.

[0112] Thickener 2: Distearate, lithium dimethylammonium montmorillonite 1%.

[0113] Oil solvent 1: Caprylic / Capric triglyceride 3%, Cocoyl alcohol-caprylate / capric acid ester 3%.

[0114] Oil solvent 2: 2% isohexadecane, 3% hydrogenated polydecene.

[0115] Plant-derived sunscreen ingredients: 0.5% wild rosehip oil and 0.5% osmanthus flower extract.

[0116] Emulsifier 1: 1% polyglycerol-4 oleate and 1.5% polyglycerol-6 polyricinoleate.

[0117] Emulsifier 2: PEG-30 dihydroxystearate 1.5%, sorbitan sesquioleate 1%.

[0118] Emollients: 6% isododecane, 4% hydrogenated polyisobutylene.

[0119] Skin feel modifiers: 2% silica, 2% polymethylsilsesquioxane.

[0120] Moisturizer 1: 4% glycerin, 3% 1,3-propanediol, and 3% butylene glycol.

[0121] Moisturizer 2: Betaine 0.5%, Sodium Hyaluronate 0.1%, Trehalose 0.4%.

[0122] Stabilizer: Sodium chloride 1.5%.

[0123] Replenish water to 100%.

[0124] III. Preparation of Sunscreen

[0125] S1. Aqueous phase: Add water-soluble UVA sunscreen, water-soluble UVB sunscreen, moisturizer, and stabilizer to water, mix well, adjust the pH to 7.8 with sodium hydroxide while stirring at 500 rpm until the system is transparent;

[0126] S2. Oil phase: Dissolve oil-soluble UVA sunscreen and oil-soluble UVB sunscreen at 60 ℃ until transparent, then add emulsifier and emollient and dissolve until transparent, then add physical sunscreen, thickening gel composition and skin feel modifier, and homogenize at 6000 rpm until the material is uniform;

[0127] S3. Adjust the temperature of the aqueous phase and oil phase to 65 ℃, keep the oil phase stirring at 530 rpm, add the aqueous phase at a speed that prevents water accumulation on the surface of the oil phase, continue stirring at 530 rpm for 6 min, homogenize at 5000 rpm for 3.5 min, then homogenize at 12000 rpm for 2.5 min, add the plant-derived sunscreen ingredients, mix at 400 rpm, then homogenize at 12000 rpm for 1.5 min, and finally degas under vacuum to obtain the final product.

[0128] Example 4: A sunscreen

[0129] I. Preparation of Thickening Gel Composition

[0130] Same as Example 1.

[0131] II. Sunscreen contains the following components by weight percentage.

[0132] UVA sunscreen agents: 3% diethylamino hydroxybenzoyl hexyl benzoate, 1.5% bis-ethylhexyloxyphenol methoxyphenyl triazine, and 0.5% terephthalomethyl dicamphor sulfonic acid.

[0133] UVB sunscreen agents: 4% homosalate, 2% ethylhexyl methoxycinnamate, and 4% phenylbenzimidazole sulfonic acid.

[0134] Physical sunscreen agents: 3% titanium dioxide, 3% zinc oxide; average particle size of titanium dioxide ≤200 nm; average particle size of zinc oxide ≤200 nm.

[0135] Thickener 1: 1% trihydroxystearin.

[0136] Thickener 2: Distearate, lithium dimethylammonium montmorillonite 0.8%.

[0137] Oil solvent 1: Caprylic / Capric triglyceride 3%, Cocoyl alcohol-caprylate / capric acid ester 2%.

[0138] Oil solvent 2: 2% isohexadecane, 2% hydrogenated polydecene.

[0139] Plant-derived sunscreen ingredients: Coptis chinensis extract 0.05%, Rosa rugosa fruit oil 0.5%.

[0140] Emulsifier 1: 0.5% polyglycerol-2 stearate and 1.5% polyglycerol-6 polyricinoleate.

[0141] Emulsifier 2: PEG-30 dihydroxystearate 1%, sorbitan isostearate 0.5%.

[0142] Emollients: 4% isododecane, 4% hydrogenated polyisobutylene.

[0143] Skin feel modifiers: 1% silica, 0.5% polymethylsilsesquioxane.

[0144] Moisturizer 1: 2% glycerin, 4% 1,3-propanediol, and 2% butylene glycol.

[0145] Moisturizer 2: Betaine 0.2%, Sodium Hyaluronate 0.05%, Trehalose 0.2%.

[0146] Stabilizer: 1% sodium chloride.

[0147] Replenish water to 100%.

[0148] III. Preparation of Sunscreen

[0149] Same as Example 1.

[0150] Example 5: A sunscreen

[0151] I. Preparation of Thickening Gel Composition

[0152] Same as Example 1.

[0153] II. Sunscreen contains the following components by weight percentage.

[0154] UVA sunscreen agents: 3% diethylamino hydroxybenzoyl hexyl benzoate, 1.5% bis-ethylhexyloxyphenol methoxyphenyl triazine.

[0155] UVB sunscreen agents: 5% ethylhexyl salicylate, 4% phenylbenzimidazole sulfonic acid.

[0156] Physical sunscreen agents: 3% titanium dioxide, 3% zinc oxide; average particle size of titanium dioxide ≤200 nm; average particle size of zinc oxide ≤200 nm.

[0157] Thickener 1: 1% trihydroxystearin.

[0158] Thickener 2: Quaternary ammonium salt-18 and bentonite 0.8%.

[0159] Oil solvent 1: Caprylic / Capric triglyceride 5%.

[0160] Oil solvent 2: Isohexadecane 4%.

[0161] Plant-derived sunscreen ingredient: Osmanthus flower extract 0.55%.

[0162] Emulsifier 1: Polyglycerol-6 polyricinoleate 2%.

[0163] Emulsifier 2: PEG-30 dihydroxystearate 1.5%.

[0164] Emollient: Isododecane 8%.

[0165] Skin feel modifier: 1.5% silica.

[0166] Moisturizer 1: 8% glycerin.

[0167] Moisturizer 2: Betaine 0.45%.

[0168] Stabilizer: 1% sodium chloride.

[0169] Replenish water to 100%.

[0170] III. Preparation of Sunscreen

[0171] S1. Aqueous phase: Add water-soluble UVB sunscreen, moisturizer, and stabilizer to water, mix well, adjust the pH to 7.5 with sodium hydroxide while stirring at 600 rpm until the system becomes transparent;

[0172] S2. Oil phase: Dissolve oil-soluble UVA sunscreen and oil-soluble UVB sunscreen at 70 ℃ until transparent, then add emulsifier and emollient and dissolve until transparent, then add physical sunscreen, thickening gel composition and skin feel modifier, and homogenize at 8000 rpm until the material is uniform;

[0173] S3. Adjust the temperature of the aqueous phase and oil phase to 65 ℃, keep the oil phase stirring at 580 rpm, add the aqueous phase at a speed that prevents water accumulation on the surface of the oil phase, continue stirring at 580 rpm for 5 min, homogenize at 6000 rpm for 3 min, then homogenize at 10000 rpm for 3 min, add the plant-derived sunscreen ingredients, mix at 350 rpm, then homogenize at 10000 rpm for 2 min, and finally degas under vacuum to obtain the final product.

[0174] Example 6 A sunscreen

[0175] I. Preparation of Thickening Gel Composition

[0176] Same as Example 1.

[0177] II. Sunscreen contains the following components by weight percentage.

[0178] UVA sunscreen agents: 3% diethylamino hydroxybenzoyl hexyl benzoate, 1.5% bis-ethylhexyloxyphenol methoxyphenyl triazine.

[0179] UVB sunscreen agents: 9% ethylhexyl methoxycinnamate, 4% phenylbenzimidazole sulfonic acid.

[0180] Physical sunscreen agents: 2% titanium dioxide, 2% zinc oxide; average particle size of titanium dioxide ≤200 nm; average particle size of zinc oxide ≤200 nm.

[0181] Thickener 1: 1% trihydroxystearin.

[0182] Thickener 2: Quaternary ammonium salt-18 and bentonite 0.8%.

[0183] Oil solvent 1: 2% pentaerythritol tetracocoate, 3% coconut oil alcohol-octanoate / decanoate.

[0184] Oil solvent 2: Hydrogenated polydecene 4.

[0185] Plant-derived sunscreen ingredient: 0.55% wild rosehip oil.

[0186] Emulsifier 1: 1% polyglycerol-4 oleate and 1% polyglycerol-6 oleate.

[0187] Emulsifier 2: 0.5% sorbitan sesquioleate and 1% sorbitan isostearate.

[0188] Emollient: 8% hydrogenated polyisobutylene.

[0189] Skin feel modifiers: 0.5% polymethylsilsesquioxane and 1% aluminum starch octenyl succinate.

[0190] Moisturizer 1: 4% 1,3-propanediol and 4% butylene glycol.

[0191] Moisturizer 2: Sodium hyaluronate 0.1%, trehalose 0.35%.

[0192] Stabilizer: 1% sodium chloride.

[0193] Replenish water to 100%.

[0194] III. Preparation of Sunscreen

[0195] S1. Aqueous phase: Add water-soluble UVB sunscreen, moisturizer, and stabilizer to water, mix well, adjust the pH to 7.5 with sodium hydroxide while stirring at 600 rpm until the system becomes transparent;

[0196] S2. Oil phase: Dissolve oil-soluble UVA sunscreen and oil-soluble UVB sunscreen at 70 ℃ until transparent, then add emulsifier and emollient and dissolve until transparent, then add physical sunscreen, thickening gel composition and skin feel modifier, and homogenize at 8000 rpm until the material is uniform;

[0197] S3. Adjust the temperature of the aqueous phase and oil phase to 65 ℃, keep the oil phase stirring at 580 rpm, add the aqueous phase at a speed that prevents water accumulation on the surface of the oil phase, continue stirring at 580 rpm for 5 min, homogenize at 6000 rpm for 3 min, then homogenize at 10000 rpm for 3 min, add the plant-derived sunscreen ingredients, mix at 350 rpm, then homogenize at 10000 rpm for 2 min, and finally degas under vacuum to obtain the final product.

[0198] Example 7 A sunscreen

[0199] I. Preparation of Thickening Gel Composition

[0200] At 75 °C, thickener 1, oil solvent 1, and oil solvent 2 are mixed until the system is transparent. Then, thickener 2 is added, and the mixture is sheared at 800 rpm for 20 min (at which point gelation occurs) to obtain the thickened gel composition.

[0201] II. Sunscreen contains the following components by weight percentage.

[0202] UVA sunscreen agents: 2% diethylamino hydroxybenzoyl hexyl benzoate, 1% bis-ethylhexyloxyphenol methoxyphenyl triazine.

[0203] UVB sunscreen agents: 9% isoamyl p-methoxycinnamate, 3% phenylbenzimidazole sulfonic acid.

[0204] Physical sunscreen agents: 2% titanium dioxide, 1% zinc oxide; average particle size of titanium dioxide ≤200 nm; average particle size of zinc oxide ≤200 nm.

[0205] Thickener 1: Trihydroxystearin 0.8%.

[0206] Thickener 2: Distearate, lithium dimethylammonium montmorillonite 0.5%.

[0207] Oil solvent 1: Caprylic / Capric triglyceride 3%, Pentaerythritol tetracocoate 1%.

[0208] Oil solvent 2: 1% isohexadecane, 1% hydrogenated polydecene.

[0209] Plant-derived sunscreen ingredient: Coptis chinensis extract 0.01%.

[0210] Emulsifier 1: 1% polyglycerol-2 stearate, 0.5% polyglycerol-6 polyricinoleate.

[0211] Emulsifier 2: PEG-30 dihydroxystearate 1%, sorbitan isostearate 0.5%.

[0212] Emollients: 4% isododecane, 2% hydrogenated polyisobutylene.

[0213] Skin feel modifiers: 0.5% silica, 0.5% polymethylsilsesquioxane.

[0214] Moisturizer 1: 5% glycerin.

[0215] Moisturizer 2: Sodium hyaluronate 0.05%.

[0216] Stabilizer: Sodium chloride 0.5%.

[0217] Replenish water to 100%.

[0218] III. Preparation of Sunscreen

[0219] S1. Aqueous phase: Add water-soluble UVB sunscreen, moisturizer, and stabilizer to water, mix well, adjust the pH to 7.2 with sodium hydroxide while stirring at 800 rpm until the system becomes transparent;

[0220] S2. Oil phase: Dissolve oil-soluble UVA sunscreen and oil-soluble UVB sunscreen at 80 ℃ until transparent, then add emulsifier and emollient and dissolve until transparent, then add physical sunscreen, thickening gel composition and skin feel modifier, and homogenize at 8000 rpm until the material is uniform.

[0221] S3. Adjust the temperature of the aqueous phase and oil phase to 60 ℃, keep the oil phase stirring at 600 rpm, add the aqueous phase at a speed that prevents water accumulation on the surface of the oil phase, continue stirring at 600 rpm for 4 min, homogenize at 7000 rpm for 2.5 min, then homogenize at 8000 rpm for 3.5 min, add the plant-derived sunscreen ingredients, mix at 300 rpm, then homogenize at 8000 rpm for 2.5 min, and finally degas under vacuum to obtain the final product.

[0222] Comparative Example 1

[0223] I. Preparation of Thickening Gel Composition

[0224] Same as Example 1.

[0225] II. Sunscreen contains the following components by weight percentage.

[0226] Same as Example 1, except that the trihydroxystearin in thickener 1 is replaced with trihydroxystearin.

[0227] III. Preparation of Sunscreen

[0228] Same as Example 1.

[0229] Comparative Example 2

[0230] I. Preparation of Thickening Gel Composition

[0231] Same as Example 1.

[0232] II. Sunscreen contains the following components by weight percentage.

[0233] Same as Example 1, except that the distearate lithium dimethylammonium montmorillonite in thickener 2 is replaced with magnesium stearate.

[0234] III. Preparation of Sunscreen

[0235] Same as Example 1.

[0236] Comparative Example 3

[0237] I. Preparation of Thickening Gel Composition

[0238] Thickener 1, oil solvent 1, and oil solvent 2 are mixed at 70 °C until the system becomes transparent, and then sheared at 900 rpm for 25 min (at which point gelation occurs) to obtain the thickened gel composition.

[0239] II. Sunscreen contains the following components by weight percentage.

[0240] Same as Example 1, except that thickener 2 is not added, and thickener 1 is adjusted to: 1.8% trihydroxystearin.

[0241] III. Preparation of Sunscreen

[0242] Same as Example 1.

[0243] Comparative Example 4

[0244] I. Preparation of Thickening Gel Composition

[0245] Same as Example 1.

[0246] II. Sunscreen contains the following components by weight percentage.

[0247] Same as Example 1, except that the caprylic / capric triglyceride in oil solvent 1 is replaced with isononyl isononanoate.

[0248] III. Preparation of Sunscreen

[0249] Same as Example 1.

[0250] Comparative Example 5

[0251] I. Preparation of Thickening Gel Composition

[0252] Same as Example 1.

[0253] II. Sunscreen contains the following components by weight percentage.

[0254] Same as Example 1, except that isohexadecane in oil solvent 2 is replaced with polydimethylsiloxane.

[0255] III. Preparation of Sunscreen

[0256] Same as Example 1.

[0257] Comparative Example 6

[0258] I. Preparation of Thickening Gel Composition

[0259] Thickener 1 and oil solvent 1 are mixed at 70 °C until the system becomes transparent, then thickener 2 is added, and the mixture is sheared at 900 rpm for 25 min (at which point gelation occurs) to obtain the thickened gel composition.

[0260] II. Sunscreen contains the following components by weight percentage.

[0261] Same as Example 1, except that oil solvent 2 is not added, and oil solvent 1 is adjusted to: 5% caprylic / capric triglyceride and 4% coconut oil alcohol-caprylate / capric acid ester.

[0262] III. Preparation of Sunscreen

[0263] Same as Example 1.

[0264] Comparative Example 7

[0265] I. Preparation of Thickening Gel Composition

[0266] Same as Example 1.

[0267] II. Sunscreen contains the following components by weight percentage.

[0268] Same as Example 1, except that the polyglycerol-2 stearate in emulsifier 1 is replaced with cetyl PEG / PPG-10 / 1 polydimethylsiloxane.

[0269] III. Preparation of Sunscreen

[0270] Same as Example 1.

[0271] Comparative Example 8

[0272] I. Preparation of Thickening Gel Composition

[0273] Same as Example 1.

[0274] II. Sunscreen contains the following components by weight percentage.

[0275] Same as Example 1, except that PEG-30 dihydroxystearate in emulsifier 2 is replaced with glyceryl stearate.

[0276] III. Preparation of Sunscreen

[0277] Same as Example 1.

[0278] Comparative Example 9

[0279] I. Preparation of Thickening Gel Composition

[0280] Same as Example 1.

[0281] II. Sunscreen contains the following components by weight percentage.

[0282] Same as Example 1, except that emulsifier 2 is not added, and emulsifier 1 is adjusted to: 1.5% polyglycerol-2 stearate and 2% polyglycerol-6 polyricinoleate.

[0283] III. Preparation of Sunscreen

[0284] Same as Example 1.

[0285] Comparative Example 10

[0286] I. Preparation of Thickening Gel Composition

[0287] Thickener 1, thickener 2, oil solvent 1, and oil solvent 2 are mixed at 70 °C (the system is opaque when mixed), and then sheared at 900 rpm for 25 min (at which point gelation occurs) to obtain the thickened gel composition.

[0288] II. Sunscreen contains the following components by weight percentage.

[0289] Same as Example 1.

[0290] III. Preparation of Sunscreen

[0291] Same as Example 1.

[0292] Comparative Example 11

[0293] I. Preparation of Thickening Gel Composition

[0294] Same as Example 1.

[0295] II. Sunscreen contains the following components by weight percentage.

[0296] Same as Example 1, except that a film-forming agent, 1% VP / eicosene copolymer, is also added.

[0297] III. Preparation of Sunscreen

[0298] S1. Aqueous phase: Add water-soluble UVA sunscreen, water-soluble UVB sunscreen, moisturizer, and stabilizer to water, mix well, adjust the pH to 7.5 with sodium hydroxide while stirring at 600 rpm until the system becomes transparent;

[0299] S2. Oil phase: Dissolve the oil-soluble UVA sunscreen, oil-soluble UVB sunscreen, and film-forming agent at 70 ℃ until transparent, then add the emulsifier and emollient and dissolve until transparent, then add the physical sunscreen, thickening gel composition, and skin feel modifier, and homogenize at 8000 rpm until the material is uniform;

[0300] S3. Adjust the temperature of the aqueous phase and oil phase to 65 ℃, keep the oil phase stirring at 580 rpm, add the aqueous phase at a speed that prevents water accumulation on the surface of the oil phase, continue stirring at 580 rpm for 5 min, homogenize at 6000 rpm for 3 min, then homogenize at 10000 rpm for 3 min, add the plant-derived sunscreen ingredients, mix at 350 rpm, then homogenize at 10000 rpm for 2 min, and finally degas under vacuum to obtain the final product.

[0301] Test Example 1: Sensory Evaluation

[0302] Ten evaluators (aged 20-35) who had undergone three months of standardized sensory evaluation training were selected to conduct sensory tests on the sunscreens obtained in Examples 1-7 and Comparative Examples 1-11. The testing environment was maintained at a constant temperature and humidity (temperature 20-22 ℃, relative humidity 50%-60%). The same area on the inside of the evaluator's left arm was designated as the test area. After each test of a sunscreen, the test area was required to be thoroughly cleaned, and the evaluator was required to sit quietly in the testing environment for 30 minutes before conducting the sensory evaluation of the next sunscreen.

[0303] Take a soybean-sized amount of the sunscreens obtained in Examples 1-7 and Comparative Examples 1-11. The sunscreens' pick-up ability is scored on a scale of 0-25. Then, apply the sunscreens to the test area at a speed of 1 second per circle. After spreading evenly (if it is not spread evenly after more than 10 circles, 10 circles are taken as the end point of application), the spreadability, greasiness, and stickiness of the sunscreens are scored on a scale of 0-25. The result is the average score of 10 evaluators. Finally, the average scores of the four sensory indicators of pick-up ability, spreadability, greasiness, and stickiness are added together to obtain the total sensory score, as shown in Table 1. The evaluation criteria are as follows: Pickiness is the ease of taking the sunscreen out of the container (0 points - difficult → 25 points - easy); Spreadability is the ease of applying the sunscreen (0 points - difficult → 25 points - easy); Oiliness is the oiliness of the skin after application (0 points - strong → 25 points - weak); and Stickiness is the adhesion between the skin and fingers after application (0 points - strong → 25 points - weak).

[0304] Table 1

[0305]

[0306] It is evident that the total sensory scores of the sunscreens obtained in Examples 1-7 are significantly better than those in Comparative Examples 1-11. This indicates that it is precisely because of the specific selection of the thickening gel composition, the type and combination of emulsifiers, and the addition of other ingredients, combined with the specific preparation method of the thickening gel composition, that the sunscreen obtained by the present invention can have such an excellent sensory experience. It is not only easy to take out and apply, but also does not have an oily or sticky feel after application.

[0307] Test Example 2: Stability Test

[0308] The sunscreens obtained in Examples 1-7 and Comparative Examples 1-11 were placed in environments of -18, 5, 25, and 45 °C for 3 months, respectively, and the results were observed to see if unstable phenomena such as layering, emulsification, oil production, coarsening, and precipitation occurred. The results are shown in Table 2.

[0309] Table 2

[0310]

[0311] In the table, "OK" indicates that no unstable phenomena such as layering, demulsification, oil seepage, coarsening, or precipitation have occurred.

[0312] It is evident that the sunscreens obtained in Examples 1-7, Comparative Examples 3, 9, and 11 exhibit better stability, while the sunscreens obtained in Comparative Examples 1-2, 4-8, and 10 all show some degree of instability. This indicates that the sunscreens obtained by the present invention, through the specific selection of thickening gel composition, the type and combination of emulsifiers, supplemented with other ingredients, and combined with a specific preparation method for the thickening gel composition, can achieve such excellent stability.

[0313] Test Example 3: Security Test

[0314] According to the human skin patch test method in the 2015 edition of the "Cosmetic Safety Technical Specifications", the sunscreens obtained in Examples 1 to 7 were subjected to patch tests on 30 people. The test results were all negative, indicating that the sunscreens of the present invention have high safety.

[0315] Test Example 4: UV Protection and Water Resistance Test

[0316] According to the "Cosmetic Safety Technical Specifications" (2015 edition), the methods for determining the sun protection factor (SPF) value, the method for determining the long-wave ultraviolet protection factor (PFA) value, and the method for determining the water resistance of sunscreen cosmetics were used to test the sunscreens obtained in Examples 1-6, Comparative Examples 3, 9, and 11. The SPF reduction rate was calculated according to "SPF reduction rate (%) = (SPF value before bathing - SPF value after bathing) / SPF value before bathing × 100%" to characterize the water resistance of the sunscreens. The results are shown in Table 3.

[0317] Table 3

[0318]

[0319] As can be seen, the SPF and PFA values ​​of the sunscreens obtained in Examples 1-6 before bathing are higher than those of Comparative Examples 3 and 9, indicating that the sunscreens of the present invention have strong UV protection performance. In addition, the SPF reduction rate of the sunscreens obtained in Examples 1-6 before and after bathing is significantly lower than that of Comparative Examples 3 and 9, and is comparable to that of the sunscreen obtained in Comparative Example 11 with added film-forming agents, indicating that the sunscreens of the present invention can still have strong waterproof performance without the addition of film-forming agents, and can still exert good sun protection effect even when the user is swimming or sweating.

[0320] Test Example 5: Blue Light Absorption Test

[0321] The sunscreens obtained in Examples 1, 3, and 7 were added to isododecane and mixed thoroughly to obtain 0.5 wt% test samples. These samples were then added to 96-well microplates and placed in a BioTek SYNERGY HTX multi-mode microplate reader for scanning in the blue light region of 400–500 nm. Pure isododecane was used as a control sample.

[0322] The results are as follows Figures 1-4 As shown. Among them, Figure 1 The absorption curve of the sunscreen obtained in Example 1 is shown in the range of 400–500 nm. Figure 2 The absorption curve of the sunscreen obtained in Example 3 is shown in the range of 400–500 nm. Figure 3 The absorption curve of the sunscreen obtained in Example 7 is shown in the range of 400–500 nm. Figure 4 The absorption curves of the control sample are shown in the range of 400–500 nm. It can be seen that, compared with the control sample, the sunscreens obtained in Examples 1, 3, and 7 all showed a significant increase in absorbance (OD value) in the range of 400–500 nm, indicating that the sunscreen of the present invention can effectively block the blue light band (400–500 nm) in the visible light spectrum, thus better reducing the damage of sunlight to human skin.

[0323] Test Example 6: Blue Light Resistance Human Body Test

[0324] Twenty participants (aged 20–35 years) were selected. Four 3 cm × 3 cm test areas were chosen on the participants' backs. Three areas were randomly selected and the sunscreens obtained in Examples 1, 3, and 7 were evenly applied to each area (as experimental groups 1–3). The application amount was 2 ± 0.05 mg / cm². 2 The remaining area will not be treated. All four areas will be treated with a strength of 30 J / cm². 2 After 7 minutes of blue light irradiation, the skin melanin content (MI) value was measured using the CK Mexameter instrument. The average value was taken, and the MI value reduction rate after using the sunscreens obtained in Examples 1, 3, and 7 was calculated according to "MI value reduction rate (%) = (MI value of control group - MI value of experimental group) / MI value of control group × 100%". The results are shown in Table 4.

[0325] Table 4

[0326]

[0327] It is evident that the MI values ​​of experimental groups 1-3 were significantly lower than those of the control group, indicating that the sunscreen of the present invention can effectively resist melanin deposition caused by blue light irradiation on the skin and has excellent blue light protection effect.

[0328] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A sunscreen, characterized in that, The product comprises the following components by weight percentage: sunscreen 18%–29%, thickening gel composition 7.3%–13.5%, plant-derived sunscreen ingredients 0.01%–1%, emulsifier 3%–5%, emollient 6%–10%, skin feel modifier 1%–4%, moisturizer 5.05%–11%, stabilizer 0.5%–1.5%, and water to 100%. The thickening gel composition is a mixture of thickener 1, thickener 2, oil solvent 1, and oil solvent 2, wherein the mass percentages of thickener 1, thickener 2, oil solvent 1, and oil solvent 2 in the sunscreen are 0.8%–1.5%, 0.5%–1%, 4%–6%, and 2%–5%, respectively; thickener 1 is trihydroxystearin; thickener 2 is at least one of distearate dimethylammonium lithium montmorillonite and quaternary ammonium salt-18 bentonite; oil solvent 1 is at least one of caprylic / capric triglyceride, pentaerythritol tetracoedate, and coconut oil alcohol-caprylate / capric acid ester; oil solvent 2 is at least one of isohexadecane and hydrogenated polydecene; the preparation method of the thickening gel composition is as follows: thickener 1, oil solvent 1, and oil solvent 2 are mixed until the system is transparent, then thickener 2 is added, and shearing is performed until a gel is formed; The emulsifier is a mixture of emulsifier 1 and emulsifier 2, and the mass percentages of emulsifier 1 and emulsifier 2 in the sunscreen are 1.5%–2.5% and 1.5%–2.5%, respectively; emulsifier 1 is at least one of polyglycerol-2 stearate, polyglycerol-4 oleate, polyglycerol-6 oleate, and polyglycerol-6 polyricinoleate; emulsifier 2 is at least one of PEG-30 dihydroxystearate, sorbitan sesquioleate, and sorbitan isostearate.

2. The sunscreen according to claim 1, characterized in that, The sunscreen agent is a mixture of UVA sunscreen agent, UVB sunscreen agent, and physical sunscreen agent; and the mass percentages of UVA sunscreen agent, UVB sunscreen agent, and physical sunscreen agent in the sunscreen are 3%–7%, 12%–14%, and 3%–8%, respectively.

3. The sunscreen according to claim 2, characterized in that, The UVA sunscreen agent is at least two of the following: diethylamino hydroxybenzoyl hexyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, and terephthalic acid dicamphor sulfonic acid, and the mass percentages of diethylamino hydroxybenzoyl hexyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, and terephthalic acid dicamphor sulfonic acid in the sunscreen are 2%–4%, 1%–2%, and 0%–1%, respectively.

4. The sunscreen according to claim 2, characterized in that, The UVB sunscreen agent is at least two of the following: homosalyl ester, ethylhexyl salicylate, ethylhexyl methoxycinnamate, isoamyl p-methoxycinnamate, and phenylbenzimidazole sulfonic acid, and the mass percentages of homosalyl ester, ethylhexyl salicylate, ethylhexyl methoxycinnamate, isoamyl p-methoxycinnamate, and phenylbenzimidazole sulfonic acid in the sunscreen are 0-9%, 0-5%, 0-9%, 0-9%, and 3-5%, respectively.

5. The sunscreen according to claim 2, characterized in that, The physical sunscreen agent is a mixture of titanium dioxide and zinc oxide, and the mass percentages of titanium dioxide and zinc oxide in the sunscreen are 2%–4% and 1%–4%, respectively.

6. The sunscreen according to claim 1, characterized in that, The plant-derived sunscreen ingredient is at least one of osmanthus flower extract, coptis extract, and wild rose fruit oil.

7. The sunscreen according to claim 1, characterized in that, The emollient is at least one of isododecane and hydrogenated polyisobutylene.

8. The sunscreen according to claim 1, characterized in that, The skin feel modifier is at least one of silica, polymethylsilsesquioxane, and aluminum starch octenyl succinate.

9. The sunscreen according to claim 1, characterized in that, The moisturizer is a mixture of moisturizer 1 and moisturizer 2, and the mass percentages of moisturizer 1 and moisturizer 2 in the sunscreen are 5% to 10% and 0.05% to 1%, respectively; moisturizer 1 is at least one of glycerin, 1,3-propanediol and butylene glycol, and moisturizer 2 is at least one of betaine, sodium hyaluronate and trehalose.

10. A method for preparing the sunscreen according to any one of claims 2 to 9, characterized in that, Includes the following steps: S1. Aqueous phase: Add water-soluble UVA sunscreen, water-soluble UVB sunscreen, moisturizer, and stabilizer to water, mix well, and adjust the pH to 7.2-7.8; S2. Oil phase: Dissolve oil-soluble UVA sunscreen and oil-soluble UVB sunscreen at 60-80 ℃ until transparent, then add emulsifier and emollient and dissolve until transparent, then add physical sunscreen, thickening gel composition and skin feel modifier and homogenize until the material is uniform; S3. Adjust the temperature of the aqueous phase and oil phase to 60-65 ℃, mix the aqueous phase and oil phase evenly, homogenize once, add plant-derived sunscreen ingredients, optional preservatives, and optional fragrances, mix evenly, homogenize a second time, and defoam to obtain the final product.

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