A sunscreen booster composition, sunscreen and method of making same

Abstract

The application provides a sunscreen synergistic composition, sunscreen cream and a preparation method thereof, and relates to the field of daily-use cosmetics. The raw materials of the sunscreen synergistic composition include, in mass parts, 0.2-2 parts of sordaria fimicola gum, 1-10 parts of jojoba ester, and 0.5-5 parts of lactobacillus / rice fermentation product. The lactobacillus / rice fermentation product is adsorbed and wrapped around sunscreen agents through a spiral cavity structure to realize uniform dispersion; the sordaria fimicola gum is crosslinked through hydrogen bonds to form a three-dimensional network gel film, which fixes sunscreen particles and improves the anti-washing property; the jojoba ester fills the gaps between the particles through lipid spreading and fusion to enhance the waterproof and sweat-resistant ability; the three together build a triple film-forming mechanism of 'adsorption and wrapping-molecular entanglement-lipid spreading', solve the problems of sunscreen agglomeration and sedimentation and low protection efficiency, realize a sunscreen film of 'uniform and dense-no leaks-high stability', and significantly improve the persistence of SPF / PA values.

Description

Technical Field

[0001] This application relates to the field of daily cosmetics, and more particularly to a sunscreen-enhancing composition, a sunscreen cream, and a method for preparing the same. Background Technology

[0002] Sunscreen, as a core means of protecting skin from photodamage and delaying photoaging, has become one of the core sectors of the cosmetics industry. With the increase in global UV exposure intensity and the continuous enhancement of consumers' skin health awareness, the market demand for sunscreen products has upgraded from "basic UV protection" to a comprehensive demand for "highly effective and long-lasting protection, gentle and safe compatibility, skin care considerations, and environmental friendliness."

[0003] Currently, the incidence of sensitive skin is relatively high. People with sensitive skin often experience discomfort such as redness, stinging, dryness, and tightness when using sunscreen products, leading to decreased adherence to sunscreen use. At the same time, the demand for sunscreen among special groups such as infants and young children is increasing, placing more stringent requirements on the gentleness and safety of these products.

[0004] Currently, the film-forming technology of sunscreen products is mainly divided into three categories: chemically synthesized film-forming agent systems, single natural film-forming agent improvement systems, and compound film-forming systems. These are the mainstream technical solutions in the industry.

[0005] Chemically synthesized film-forming agent system: This system is the most widely used technical solution on the market. Its core components are chemically synthesized film-forming agents such as PVP / VA copolymers, polysiloxanes (e.g., polydimethylsiloxane, polydimethylsiloxane cross-linked polymers), and acrylate polymers (e.g., acrylate copolymers, hydroxyethyl acrylate / sodium acryloyldimethyl taurate copolymers). The principle is that chemical polymers spread and cross-link on the skin surface to form a continuous thin film layer, fixing sunscreen particles to the skin surface, thereby improving adhesion, enhancing water and sweat resistance, and increasing sun protection durability. To ensure film density, the addition amount of this type of film-forming agent usually needs to exceed 5%, making it the mainstream technology choice for current mid-to-high-end sunscreen products.

[0006] Improved systems using single natural film-forming agents: In response to consumer demand for "natural and gentle" products, some research attempts have explored replacing some chemical film-forming agents with single natural polymers. Common examples include natural polysaccharides such as xanthan gum, gum arabic, konjac gum, and pectin, or single fermentation products (such as yeast fermentation filtrate) and single plant oils (such as olive oil and squalane). This system utilizes the biocompatibility of natural components to reduce irritation, while leveraging the film-forming properties of natural polysaccharides or the spreadability of oils to assist in constructing a sunscreen film. However, such technologies only represent "partial replacement" or "single-dimensional improvement," failing to form a systematic film-forming system design. The density and stability of the film still rely on the supplementation of chemical film-forming agents.

[0007] Compound film-forming systems: These systems attempt to combine chemical film-forming agents with small amounts of natural polymers (such as xanthan gum and sclerotium gum) or oils to improve skin feel and gentleness to some extent. For example, adding a small amount of jojoba ester to polysiloxane film-forming agents can reduce stickiness, or sclerotium gum can be compounded into PVP / VA copolymers to enhance film elasticity. However, these compound systems still rely primarily on chemical film-forming agents, with natural components serving only as auxiliary modifiers. They fail to fundamentally change the chemical properties of the system, nor do they form a multi-mechanism synergistic film-forming design. They cannot address the core issues of irritation and environmental unfriendliness caused by chemical film-forming agents at the source, and they struggle to achieve a synergistic effect of both protection and care.

[0008] Despite the different focuses of the aforementioned technologies, existing sunscreen film-forming technologies still generally suffer from the following drawbacks: Existing systems mostly rely on chemically synthesized film-forming agents (such as PVP / VA copolymers and polysiloxanes) as their core, and do not use all-natural-derived components in the system design from the source, making it difficult to fundamentally solve the problems of skin irritation and environmental accumulation.

[0009] The existing system lacks a multi-mechanism synergistic design of "adsorption-encapsulation-molecular entanglement-lipid spreading", which makes it impossible to simultaneously achieve uniform dispersion of sunscreen agents, dense and stable film and optimized skin feel, resulting in a large deviation between the theoretical and actual values ​​of SPF / PA.

[0010] Existing film-forming sunscreens have limited functionality, focusing only on long-lasting protection and failing to build an integrated system of "moisturizing-repairing-protection," thus failing to address issues such as dry skin and barrier damage after sun protection.

[0011] Existing technologies struggle to reconcile the three core contradictions of "film density and skin feel," "protective efficiency and gentleness," and "durability and safety," resulting in poor product performance and low user compliance.

[0012] Specific patent cases also confirm the above shortcomings: Patent CN108464947A uses a chemically synthesized film-forming agent combined with hollow microspheres to improve sun protection efficiency through light scattering effect, but the film-forming system lacks naturally derived components, is not gentle enough, and has no skin repair function; Patent CN121015487A, although it introduces a naturally modified film-forming agent, is still a natural-semi-synthetic-chemical mixed system, and has not formed a fully natural multi-synergistic film-forming mechanism, lacking an integrated design of protection and repair; Patent CN117860617A focuses on the water resistance-skin feel balance of water-in-oil formulations, but the core film-forming agent is still a chemically synthesized compound, resulting in insufficient film density and long-lasting protection.

[0013] Therefore, the market urgently needs an all-natural, multi-mechanism synergistic, integrated sunscreen film-forming composition that combines protection and care. Summary of the Invention

[0014] The purpose of this application is to provide a sunscreen-enhancing composition, a sunscreen, and a method for preparing the same, in order to solve the above-mentioned problems.

[0015] To achieve the above objectives, the first aspect of this application provides a sunscreen synergistic composition, wherein the raw materials, by weight, include: 0.2-2 parts of Sclerotium sclerotium gum, 1-10 parts of jojoba esters, and 0.5-5 parts of Lactobacillus / rice fermentation products.

[0016] A second aspect of this application provides a sunscreen whose ingredients include the aforementioned sunscreen-enhancing composition.

[0017] Optionally, the raw materials of the sunscreen may also include phase A, phase B, and phase C; Phase A includes an aqueous phase; Phase B includes an oil phase; The C phase includes a corrosion-resistant phase.

[0018] Optionally, the raw materials for phase A include: water, p-hydroxyacetophenone, polyol, polymer, and chelating agent; The mass ratio of the water, the p-hydroxyacetophenone, the polyol, the polymer, and the chelating agent is 40-80:0.3-0.7:3.0-10:0.3-0.7:0.03-0.08.

[0019] Optionally, the raw materials of phase B include: emulsifiers, oils, and sunscreens; The mass ratio of the emulsifier, the oil, and the sunscreen is 1-7:5-15:10-30.

[0020] Optionally, the C phase includes an alcohol-based preservative.

[0021] Optionally, the mass ratio of the sunscreen synergistic composition, phase A, phase B, and phase C is 1.7-27:21-83.1:15-51:0.2-1.

[0022] A third aspect of this application provides a method for preparing the sunscreen, comprising: mixing raw materials to obtain the sunscreen.

[0023] Optionally, the mixing includes: first mixing sclerotium gum, lactobacillus / rice fermentation product and raw materials of phase A to obtain a first mixture; The jojoba esters and the raw materials of phase B are mixed a second time to obtain a second mixture; The first mixture, the second mixture, and phase C are then mixed in a third mixture to obtain a sunscreen.

[0024] Optionally, the temperature of the first mixture is 75-90°C; The temperature of the second mixture is 75-90℃.

[0025] Compared with the prior art, the beneficial effects of this application include: The sunscreen synergistic composition provided in this application, through the synergistic effect of Lactobacillus / rice fermentation products, Sclerotium sclerotium gum, and jojoba esters, pioneers a three-component film-forming system derived entirely from natural sources, breaking through the limitations of chemical film-forming agents from the source: Lactobacillus / rice fermentation products adsorb and encapsulate sunscreen agents through a helical cavity structure, achieving uniform dispersion; Sclerotium sclerotium gum forms a three-dimensional network gel film through hydrogen bond cross-linking, fixing sunscreen particles and improving erosion resistance; Jojoba esters fill the gaps between particles through lipid spreading and fusion, enhancing waterproof and sweat-resistant capabilities; the three together construct a triple film-forming mechanism of "adsorption and encapsulation - molecular entanglement - lipid spreading," solving the problems of sunscreen agent aggregation and sedimentation and low protective efficiency, achieving a sunscreen film that is "uniform and dense - without gaps - highly stable," significantly improving the durability of SPF / PA values.

[0026] The sunscreen provided in this application has excellent sun protection effect, good waterproof performance, natural ingredients that are easily degradable, no risk of environmental accumulation, and combines excellent user experience with eco-friendliness.

[0027] The method for preparing sunscreen provided in this application is simple to operate and uses readily available raw materials. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation on the scope of this application.

[0029] Figure 1 The images show the actual results of the waterproofing tests in Examples 1-3. Figure 2 The images show the actual results of the waterproofing test in Examples 4-5. Figure 3 The images show the actual results of the waterproofing tests for Comparative Examples 1-3. Figure 4 The images show the actual waterproof test results for Comparative Examples 4-6. Detailed Implementation

[0030] First, the solution provided in this application will be explained in more detail as follows: The first aspect of this application provides a sunscreen synergistic composition, wherein the raw materials, by weight, include: 0.2-2 parts of Sclerotium sclerotium gum, 1-10 parts of jojoba esters, and 0.5-5 parts of Lactobacillus / rice fermentation products.

[0031] Optionally, the raw materials of the sunscreen synergistic composition, by weight, may include: 0.2 parts, 0.5 parts, 1 part, 1.5 parts, 2 parts, or any value between 0.2 and 2 parts of sclerotium spores; 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, or any value between 1 and 10 parts of jojoba esters; and 0.5 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, or any value between 0.5 and 5 parts of lactobacillus / rice fermentation product.

[0032] Addressing the core pain points of existing chemical film-forming systems, such as skin irritation, environmental accumulation, poor sunscreen dispersibility, limited functionality, and performance imbalance, this application pioneers a three-component synergistic film-forming system derived entirely from natural sources: Lactobacillus / rice fermentation products, Sclerotium sclerotium gum, and jojoba esters. This sunscreen-enhancing composition innovatively constructs a triple synergistic film-forming mechanism of "adsorption and encapsulation - molecular entanglement and cross-linking - lipid spreading and fusion," overcoming the technical challenge of simultaneously achieving film density and sunscreen dispersibility. Simultaneously, it establishes an integrated functional system of "moisturizing - repairing - protecting," breaking through the single-function limitations of traditional film-forming sunscreens. Through a multi-performance balancing design, it effectively reconciles the three core contradictions of "density and skin feel," "efficiency and gentleness," and "long-lasting effect and safety," achieving the dual value of highly effective sun protection and gentle skin care. It is suitable for sensitive skin, infants, and other special populations, and complies with green environmental regulations and consumer trends.

[0033] The triple synergistic film-forming mechanism: The product obtained from Lactobacillus fermentation of rice has a microporous structure, which can encapsulate sunscreen particles through physical adsorption, effectively preventing particle aggregation and sedimentation, avoiding protective blind spots on the skin surface, ensuring uniform distribution of sunscreen, and improving the uniformity and effectiveness of sun protection. Sclerotium sclerotium gum is a natural high-molecular-weight polysaccharide composed of glucose molecules, containing a β-1,3-glucose backbone and β-1,6-glucose branches. It can cross-link through intermolecular hydrogen bonds to form a three-dimensional network of dense gel film, firmly fixing the encapsulated sunscreen particles in the film layer, preventing them from being lost with sweat, sebum, or friction, significantly improving the stability and erosion resistance of the sunscreen film. Jojoba esters, as natural fatty acid esters, have excellent spreadability and blendability, and can spread evenly on the film surface, filling the tiny gaps between sunscreen particles to form a continuous, leak-free hydrophobic protective layer, further enhancing the density and waterproof and sweat-resistant properties of the sunscreen film, and extending the duration of sun protection.

[0034] This product constructs an integrated system of "moisturizing, repairing, and protecting," achieving a dual effect of highly effective sun protection and gentle care: On the skin side (care dimension): The three components work synergistically to form a three-layered, progressive moisturizing and repairing structure. Lactobacillus / rice ferment products contain various natural moisturizing factors that replenish the skin's moisture and retain it; the gel film formed by sclerotium gum has excellent water-locking ability, effectively preventing moisture evaporation; the lipid film formed by jojoba esters nourishes the stratum corneum, fills lipid gaps, and assists in repairing the skin barrier. Simultaneously, the fermentation products regulate the skin's microecological balance, synergistically accelerating barrier repair and fundamentally improving common problems after using sunscreen products, such as dryness, tightness, and barrier damage. On the sun protection side (protection dimension): Based on the hydrophobic properties of jojoba esters, combined with the erosion resistance of sclerotium gum and the skin-adhesive properties of the fermentation products, a powerful waterproof and sweat-resistant system is constructed, significantly extending the protection time. Furthermore, the active ingredients in the fermentation products have a soothing effect, reducing the irritation of the sunscreen itself, achieving a balance between "highly effective protection" and "gentle care."

[0035] This product features a precise blend of three key components, achieving a balance between density and skin feel: the three-dimensional network structure of sclerotium sclerotium gum optimizes the thickness of the film, jojoba esters' excellent spreadability prevents tightness after film formation, and lactobacillus / rice fermentation products enhance overall smoothness. These three components work synergistically to completely eliminate the "thick and sticky" problem of chemical film-forming agents, greatly improving consumer compliance. It also achieves a balance between protective efficiency and gentleness: the triple film-forming mechanism works synergistically to form a denser and more stable sunscreen film, effectively reducing UV penetration and improving sun protection efficiency. Simultaneously, the biocompatibility of the all-natural components and the soothing effect of the fermentation products reduce skin irritation at the source, avoiding the risk of skin barrier damage, making it suitable for sensitive skin and other special groups. Finally, it achieves a balance between durability and safety: by enhancing waterproof and sweat-resistant properties, it significantly extends the effective protection time of a single application, improving sun protection durability. Furthermore, the environmentally degradable nature of the all-natural components completely solves the environmental accumulation problem caused by chemical film-forming agents, ensuring both product safety and environmental friendliness.

[0036] A second aspect of this application provides a sunscreen whose ingredients include the aforementioned sunscreen-enhancing composition.

[0037] In some embodiments, the raw materials of the sunscreen also include phase A, phase B, and phase C; Phase A includes an aqueous phase; Phase B includes an oil phase; The C phase includes a corrosion-resistant phase.

[0038] In some embodiments, the raw materials for phase A include: water, p-hydroxyacetophenone, polyol, polymer, and chelating agent; The mass ratio of the water, the p-hydroxyacetophenone, the polyol, the polymer, and the chelating agent is 40-80:0.3-0.7:3.0-10:0.3-0.7:0.03-0.08.

[0039] Optionally, the mass ratio of water, p-hydroxyacetophenone, polyol, polymer, and chelating agent can be (40:0.3:3.0:0.3:0.03), (60:0.3:3.0:0.3:0.03), (80:0.3:3.0:0.3:0.03), (40:0.5:3.0:0.3:0.03), (40:0.7:3.0:0.3:0.03), (40:0.3:5.0:0.3:0. .03), (40:0.3:10.0:0.3:0.03), (40:0.3:3.0:0.5:0.03), (40:0.3:3.0:0.7:0.03), (40:0.3:3.0:0.3:0.05), (40:0.3:3.0:0.3:0.08) or any value between 40-80:0.3-0.7:3.0-10:0.3-0.7:0.03-0.08.

[0040] In some embodiments, the raw materials of phase B include: emulsifiers, oils, and sunscreens; The mass ratio of the emulsifier, the oil, and the sunscreen is 1-7:5-15:10-30.

[0041] Optionally, the mass ratio of emulsifier, oil, and sunscreen agent can be any value between (1:5:10), (2:5:10), (3:5:10), (4:5:10), (5:5:10), (6:5:10), (7:5:10), (1:10:10), (1:15:10), (1:5:20), (1:5:30), or between 1 and 7:5-15:10-30.

[0042] In some embodiments, the C phase comprises an alcohol-based preservative.

[0043] In some embodiments, the mass ratio of the sunscreen synergistic composition, phase A, phase B, and phase C is 1.7-27:21-83.1:15-51:0.2-1.

[0044] Optionally, the mass ratio of the sunscreen synergistic composition, phase A, phase B, and phase C can be any value between (1.7:21:15:0.2), (27:21:15:0.2), (1.7:83.1:15:0.2), (1.7:21:51:0.2), (1.7:21:15:1), or 1.7-27:21-83.1:15-51:0.2-1.

[0045] It should be noted that although the natural-derived sunscreen synergistic composition described in this application can be adapted to any sunscreen formulation and achieve broad-spectrum synergy, when combined with the three-phase system of phases A, B, and C as defined in this application, a multi-dimensional synergistic mechanism can be constructed to achieve a significant leap in technical effect. The specific synergistic effects are as follows: Phase A, with humectants, chelating agents, and rheology modifiers at its core, provides a stable dispersion and cross-linking environment for the polysaccharide film-forming network of Sclerotium tauracene. The ammonium acryloyl dimethyl taurate / VP copolymer in Phase A can form hydrogen bonds with Sclerotium tauracene, enhancing the density and anti-migration properties of the three-dimensional network protective film, reducing the loss of sunscreen agents due to sweating and friction, and avoiding the dryness and tightness problems caused by single polysaccharide film formation. Moisturizing ingredients such as dipropylene glycol and butylene glycol synergistically enhance the water-retaining properties of Lactobacillus / rice fermentation products, increasing the moisture content of the stratum corneum, alleviating the dryness and discomfort of sunscreen products, and optimizing the gentleness of the formula.

[0046] Phase B is the core carrier of chemical sunscreens. Jojoba esters are miscible with oil components such as isononyl isononanoate and polydimethylsiloxane, forming a uniform and stable oil phase network. This significantly improves the dispersibility of sunscreens and avoids SPF reduction, whitening, or pilling caused by aggregation. Simultaneously, jojoba esters are highly similar in structure to human sebum, optimizing oil phase spreadability and helping sunscreens form a continuous, seamless protective layer. They also reduce skin irritation from high-concentration chemical sunscreens and minimize damage to the skin from photoaging byproducts.

[0047] Phenoxyethanol in phase C provides a stable preservative environment for the active ingredients in the sunscreen synergistic composition, ensuring their bioactivity. Lactobacillus / rice fermentation products are rich in amino acids, phytic acid, and other antioxidants, which can synergistically work with the sunscreen system to eliminate UV-induced free radicals and strengthen protection against photodamage. Their soothing properties can also alleviate the potential irritation of chemical sunscreens, reduce the risk of redness and sensitivity after sun exposure, and improve skin tolerance to high-SPF sunscreens.

[0048] Phase A ensures the stability and moisturizing properties of the aqueous film-forming component, Phase B optimizes the dispersion and spread of the oil-phase sunscreen agents, and Phase C enhances the safety and repair properties of the formulation. When combined with a natural sunscreen synergist, these three phases form a complete synergistic system of "film formation-protection-repair." Compared to formulations without this three-phase system, the sunscreen of this application significantly improves the bioavailability and SPF / PA value stability of the sunscreen agents, enhances water and sweat resistance, and achieves a balance of high sun protection, high stability, high comfort, and high safety.

[0049] A third aspect of this application provides a method for preparing the sunscreen, comprising: mixing raw materials to obtain the sunscreen.

[0050] In some embodiments, the mixing includes: first mixing sclerotium gum, lactobacillus / rice fermentation product and raw materials of phase A to obtain a first mixture; The jojoba esters and the raw materials of phase B are mixed a second time to obtain a second mixture; The first mixture, the second mixture, and phase C are then mixed in a third mixture to obtain a sunscreen.

[0051] In some embodiments, the temperature of the first mixture is 75-90°C; Optionally, the temperature of the first mixture can be any value between 75°C, 80°C, 85°C, 90°C, or 75-90°C. The temperature of the second mixture is 75-90℃.

[0052] Optionally, the temperature of the second mixture can be any value between 75°C, 80°C, 85°C, 90°C, or 75-90°C.

[0053] The implementation schemes of this application will be described in detail below with reference to specific embodiments. However, those skilled in the art will understand that the following embodiments are only for illustrating this application and should not be regarded as limiting the scope of this application. Unless otherwise specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments used without specified manufacturers are all conventional products that can be purchased commercially.

[0054] Example 1 The first aspect of this embodiment provides a sunscreen enhancing composition, the raw materials of which, by weight, include: 0.5 parts of Sclerotium sclerotium gum, 2 parts of jojoba esters, and 1 part of Lactobacillus / rice fermentation product.

[0055] A second aspect of this application also provides a sunscreen, the raw materials of which include the above-mentioned sunscreen synergistic composition, phase A, phase B and phase C; The raw materials for phase A are: water, p-hydroxyacetophenone, butanediol, dipropylene glycol, ammonium acryloyldimethyl taurate / VP copolymer, and disodium EDTA; the raw materials for phase B are: cetearyl alcohol, cetearyl glucoside, isononyl isononanoate, ethylhexyl methoxycinnamate, ethylhexyl salicylate, octocrylene, bis-ethylhexyloxyphenol methoxyphenyl triazine, diethylamino hydroxybenzoyl hexyl benzoate, dioctyl carbonate, and polydimethylsiloxane; the raw material for phase C is phenoxyethanol; the specific amounts are shown in Table 1.

[0056] A third aspect of this application also provides a method for preparing a sunscreen, the specific steps of which are: The sclerotium gum, lactobacillus / rice fermentation product and the raw materials of phase A are first mixed and heated to 90°C to obtain the first mixture; The jojoba esters and the raw materials of phase B are mixed in a second way and heated to 90°C to obtain a second mixture; The first mixture, the second mixture, and phase C are mixed in a third mixture to obtain the sunscreen.

[0057] This application also provides Examples 2-5, and the specific raw materials and their amounts are shown in Table 1.

[0058] Comparative Example 1 The difference from Example 1 is that the lactobacillus / rice fermentation product is replaced with an equal mass of sodium stearoyl glutamate.

[0059] Comparative Example 2 The difference from Example 1 is that the sclerotium gum is replaced with an equal mass of xanthan gum.

[0060] Comparative Example 3 The difference from Example 1 is that jojoba esters are replaced with an equal mass of shea butter.

[0061] Comparative Example 4 The difference from Example 1 is that no sclerotium gum is added.

[0062] Comparative Example 5 The difference from Example 1 is that no jojoba esters are added.

[0063] Comparative Example 6 The difference from Example 1 is that no lactobacillus / rice fermentation products are added.

[0064] Table 1 Raw material usage and dosage

[0065] Security test Using the 2022 Cosmetic Safety Technical Specifications as a reference standard, the sunscreen irritation of the above-mentioned examples and comparative examples was evaluated. The test method was a skin patch test, and 30 people aged 16 to 65 years were randomly distributed to participate in the test.

[0066] Test method: Place the test substance into a patch applicator at a dosage of 0.020~0.025g. Cover the patch applicator containing the test substance onto the back or flexor side of the forearm of the subject with non-irritating adhesive tape. Gently press with the palm of your hand to ensure even adhesion to the skin surface. Leave on for 24 hours. Remove the patch applicator and observe the skin reaction 30 minutes after the pressure mark disappears. If the result is negative, observe again at 24 hours and 48 hours after the patch test.

[0067] Evaluation criteria: Grade 0: Negative reaction; Grade 1: Suspicious reaction, only slight erythema; Grade 2: Weak positive reaction, erythema, infiltration, edema, and possible papules; Grade 3: Strong positive reaction, erythema, infiltration, edema, and possible papules, reaction may extend beyond the test area; Grade 4: Very strong positive reaction, obvious erythema, severe infiltration, edema, confluent herpes, reaction extends beyond the test area.

[0068] Test results: All subjects had negative skin reactions to Examples 1-5 and Comparative Examples 1-6.

[0069] The above test results show that the sunscreen synergistic composition provided in this application is gentle and non-irritating to the skin and safe to use.

[0070] Waterproof test Waterproof performance test: Several healthy subjects were selected, and the test area was marked on the inside of the subject's forearm. The test sample was evenly applied at a dosage of 1.3 mg / cm² and left at room temperature for 20 min to form a film.

[0071] Test method: The test area was photographed with ultraviolet light to record the initial protection status; then the subject was immersed in water at 30℃±2℃ for 20 min × 2 times, for a total water bath time of 40 min, during which the test area was avoided from being wiped; after the water bath, the test area was air-dried naturally, and the test area was photographed again with a UVlook ultraviolet imager to observe the image status of the sunscreen film.

[0072] Evaluation criteria: If the image remains almost unchanged and still dark, it indicates a high retention rate of the sunscreen film and good water resistance; if the image becomes brighter, white spots appear, or patches appear, it indicates that the sunscreen film has been washed away, thinned, or cracked, and has poor water resistance.

[0073] The waterproof test results of Examples 1-3 are as follows: Figure 1 As shown; the waterproof test results of Examples 4-5 are as follows. Figure 2 As shown; the waterproof test results of Comparative Examples 1-3 are as follows. Figure 3As shown, the waterproof test results of Comparative Examples 4-6 are as follows: Figure 4 As shown.

[0074] The test results above show that, in Comparative Examples 1-3, the sunscreen film showed localized brightening and slight white spots after immersion in water, indicating that the film structure became thinner and had poor water resistance; in Comparative Examples 4-6, the sunscreen film showed significant brightening and localized mottled appearance after immersion in water, indicating that the sunscreen film was washed away, thinned, and had poor water resistance.

[0075] Images from Examples 2-3 show that although the sunscreen film did not change after immersion in water, its color became significantly lighter, indicating a low retention rate of the film structure and poor water resistance. Images from Example 5 show that the sunscreen film showed slight mottled patches after immersion in water, indicating that the film structure was washed away and cracked, resulting in poor water resistance. Images from Examples 1 and 4 show that the sunscreen film remained almost unchanged and dark after immersion in water, indicating that the formulated film has good density, a high retention rate after immersion in water, and excellent water resistance.

[0076] SPF test Test subjects: Examples 1-5; Comparative Examples 1-6.

[0077] Reference standard: SPF value 16.1+2.4, prepared according to the standard formula of high SPF standard (P2) in the "Cosmetic Safety Technical Specifications" (2015 edition).

[0078] Participants: A total of 10 participants, 5 males and 5 females, aged 44 to 57 years, with a mean age of 51.8 ± 6.3 years, who met the criteria for voluntary inclusion.

[0079] Light source: Xenon arc lamp from a daylight simulator; all performance indicators meet the requirements of the testing specifications.

[0080] Test Method: The test shall be conducted in accordance with the specific requirements of the currently effective technical specifications. The subject shall be positioned in a forward-leaning position, and their back shall be irradiated. The minimum erythema dose (MED) of the subject's skin to ultraviolet radiation shall be predicted 24 hours prior to the test, and the ultraviolet radiation dose shall be adjusted accordingly for testing the analyte. On the day of the test, a location at least 30 cm deep shall be selected on the subject's back. 2 For normal skin areas, apply (2.00 + 0.05) mg / cm². 2 The test substance or control is evenly applied to the above-mentioned area, and then the irradiation dose is selected according to the standard requirements. Irradiation is carried out in three cases: 1. No test substance is applied to the subject's skin; 2. Control is applied; 3. Test substance is applied. The experimental results are observed after 24 hours, and the MED values ​​are recorded in each of the three cases.

[0081] 3. SPF Value Calculation Method: The SPF value of the analyte or control for protecting a single subject is expressed by the following formula: ; Individual SPF values ​​must be accurate to one decimal place. Calculate the arithmetic mean of the SPF values ​​of all subjects using the tested material, and take the integer part as the SPF value of that sample. The sampling error of estimating the mean can be calculated by calculating the standard deviation and standard error of the data set. The 95% confidence interval (95% CI) of the mean must not exceed 17% of the mean; otherwise, the number of subjects should be increased (not exceeding 25) until this requirement is met.

[0082] The SPF test results are shown in Table 2.

[0083] Table 2 SPF Test Results

[0084] Using a standard reference, the SPF values ​​of the sunscreen products in the examples and comparative examples were determined in this experiment. The results are as follows: The SPF values ​​of all tested samples were significantly higher than those of the control, with the average SPF value of the control remaining stable within the range of 15.8–16.4, demonstrating the reliability of the experimental system. Among them, Example 4 had the highest SPF value at 53.8, followed by Example 1 at 52.4; the average SPF values ​​of the remaining examples ranged from 45.2 to 49.5, showing excellent overall performance. The average SPF values ​​of Comparative Examples 1–6 were 42.6–44.2, also significantly higher than the control, but slightly lower overall than the examples.

[0085] PFA value test Tested samples: Examples 1-5; Comparative Examples 1-6.

[0086] Reference standard: PFA value 4.4±0.6, prepared according to the standard formula of high PFA standard in the "Cosmetic Safety Technical Specifications" (2015 edition).

[0087] Participants: A total of 10 participants, 5 males and 5 females, aged 44 to 57 years, with a mean age of 51.8 ± 6.3 years, meeting the criteria for voluntary inclusion.

[0088] Light source: Xenon arc lamp from a daylight simulator; all performance indicators meet the requirements of the testing specifications.

[0089] Test Method: Subjects were placed in a supine position, and their backs were irradiated. Before testing, the minimum sustained melanization dose (MPPD) of the subject's skin to ultraviolet radiation was predicted, and the ultraviolet radiation dose was adjusted based on the prediction result for sample testing. On the day of testing, a 7cm × 7cm skin area was first selected on the subject's back, and an ultraviolet radiation dose of (2.00 ± 0.05) mg / cm² was applied. 2To prepare the sample, the test sample or standard control is evenly applied to the above-mentioned area. Then, an appropriate amount of ultraviolet light is selected, and irradiation is performed under three conditions: ① no sample is applied to the subject's skin, ② the standard control sample is applied, and ③ the test sample is applied. The experimental results are observed after 2-4 hours, and the MPPD values ​​are recorded under each of the three conditions.

[0090] PFA value calculation method: The PFA value of the analyte or control for protecting a single subject is expressed by the following formula: ; Individual PFA values ​​must be accurate to one decimal place. The arithmetic mean of the PFA values ​​of all subjects protecting the sample is calculated, and the integer part is taken as the PFA value of the sample being tested. The detection results of the above PFA values ​​are shown in Table 3.

[0091] Table 3. Test Results of PFA Values

[0092] This test used a standard reference as a standard to determine the PFA values ​​of the sunscreen products in Examples 1-5 and Comparative Examples 1-6. The PFA values ​​of all examples were significantly higher than those of the comparative examples. The average PFA value of the reference standard was 4.7, demonstrating the reliability of the experimental system. Example 4 had the highest PFA value at 13, followed by Example 1 at 12.5. The average PFA values ​​of the remaining examples ranged from 9 to 13, showing excellent overall performance. The average PFA values ​​of Comparative Examples 1-6 were 8-9, also significantly higher than the reference standard, but slightly lower than those of the examples. In summary, the sunscreen synergistic compositions provided in this application (Examples 1-5) can effectively increase the PFA value of sunscreens, achieving a highly effective sun protection effect, and their overall sun protection performance is superior to the formulations of the comparative examples.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0094] Furthermore, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, any of the claimed embodiments can be used in any combination. The information disclosed in this background section is intended only to enhance the understanding of the general background of this application and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

Claims

1. A sunscreen, characterized in that, Its raw materials consist of a sunscreen synergist composition, phase A, phase B, and phase C; The raw materials of the sun protection synergistic composition, by weight, consist of 0.2-2 parts of Sclerotium sclerotium gum, 1-10 parts of jojoba esters, and 0.5-5 parts of Lactobacillus / rice fermentation product; Phase A is an aqueous phase; Phase B is an oil phase; The C phase is a corrosion-resistant phase; The raw materials for phase A are: water, p-hydroxyacetophenone, polyol, polymer, and chelating agent; The raw materials for phase B are: emulsifier, oil, and sunscreen. Phase C is an alcohol-based preservative; The mass ratio of the water, the p-hydroxyacetophenone, the polyol, the polymer, and the chelating agent is 40-80:0.3-0.7:3.0-10:0.3-0.7:0.03-0.

08. The mass ratio of the emulsifier, the oil, and the sunscreen is 1-7:5-15:10-30; The mass ratio of the sunscreen enhancing composition, phase A, phase B and phase C is 1.7-27:21-83.1:15-51:0.2-1.

2. A method for preparing a sunscreen as described in claim 1, characterized in that, include: The raw materials are mixed to obtain the sunscreen.

3. The method for preparing sunscreen according to claim 2, characterized in that, The mixing includes: first mixing sclerotium gum, lactobacillus / rice fermentation product and raw materials of phase A to obtain a first mixture; The jojoba esters and the raw materials of phase B are mixed a second time to obtain a second mixture; The first mixture, the second mixture, and phase C are then mixed in a third mixture to obtain a sunscreen.

4. The method for preparing sunscreen according to claim 3, characterized in that, The temperature of the first mixture is 75-90℃; The temperature of the second mixture is 75-90℃.

Images