Water-sweat-resistant and sunscreen synergistic composition as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of cosmetics, and discloses a water-sweat-resistant and sunscreen synergistic composition as well as a preparation method and application thereof. The composition comprises the following components: rice starch, candelilla wax, sunflower seed wax, silica and beewax. According to the formula of the composition, the rice starch, the candelilla wax, the sunflower seed wax, the silica and the beewax are contained, and through the unique formula combination, a good synergistic effect is generated among all the components, so that the composition has excellent water and sweat resistance durability and sunscreen synergism.

Description

Technical Field

[0001] This invention belongs to the field of cosmetic technology, and specifically relates to a composition that enhances water and sweat resistance and sun protection, as well as its preparation method and application. Background Technology

[0002] The core function of sunscreen products is to protect the skin by absorbing or blocking ultraviolet rays. Water and sweat resistance and sun protection enhancement are key indicators for evaluating product performance, especially suitable for outdoor activities and sports where sweating is frequent. Traditional sunscreen products mostly improve water and sweat resistance by adding synthetic polymer film-forming agents (such as acrylate copolymers). However, these ingredients can easily lead to a heavy feel on the skin, cause breakouts, and have poor compatibility with sunscreen agents, making them prone to precipitation. Sun protection enhancement mainly relies on increasing the mass content of sunscreen agents in the sunscreen product (usually greater than 20%), which not only increases the risk of skin irritation but also causes problems such as whitening and pilling, making it difficult to balance safety and user experience.

[0003] From a technical perspective, traditional sunscreen products have obvious shortcomings: products that rely on ordinary film-forming agents to improve water and sweat resistance are prone to causing problems such as acne and irritation, and have poor compatibility with sensitive skin groups; formulas that only achieve enhanced efficacy by compounding sunscreen agents are costly and have a heavy feel on the skin; natural ingredient compounding solutions often focus on a single function, such as adding protein film-forming agents, but their water resistance is insufficient.

[0004] Therefore, how to reduce the irritation of products and improve their water and sweat resistance and sun protection effectiveness is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, the object of the present invention is to provide a composition with excellent water and sweat resistance and enhanced sun protection, a method for its preparation, and its application, wherein the composition possesses both excellent water and sweat resistance and enhanced sun protection.

[0006] In a first aspect, the present invention provides a composition that enhances water and sweat resistance and sun protection, the composition comprising the following components: rice starch, candelilla wax, sunflower seed wax, silica, and beeswax.

[0007] Specifically, the core mechanism by which the composition of this invention achieves enhanced water and sweat resistance and sun protection is the construction of a dual synergistic structure of "starch-wax dense film-forming network + silica dispersion support system." This structure achieves functional synergy through a step-by-step process of "skeleton construction - gap filling - dispersion enhancement - stabilization and locking." The water and sweat resistance is centered on "multi-layered interwoven film formation": rice starch serves as the basic film-forming skeleton, forming a continuous and flexible initial film layer that initially blocks the penetration of sunscreen agents; candelilla wax, sunflower seed wax, and beeswax are compounded to fill the pores of the starch film. The three components have a gradient melting point distribution (60-80℃), melting and filling at skin temperature. Candelilla wax increases the film's hardness and erosion resistance, sunflower seed wax enhances extensibility and prevents cracking, and beeswax, through emulsification compatibility, combines hydrophobic waxes with starch to form a dense hydrophobic film of "skeleton + filler." Upon contact with water and sweat, the water and sweat bead up and roll off without penetrating. The enhanced sun protection relies on the principle of "silica-mediated dispersion-locking": porous silica physically adsorbs and evenly anchors the sunscreen agent, preventing agglomeration and the formation of "protective blind spots," increasing the UV exposure area, and achieving "low additives, high protection." Simultaneously, silica embedded in the film layer forms a "micro-scaffold," maintaining a loose structure for breathability and preventing film collapse that could lead to sunscreen agent inactivation. The entire formula synergistically strengthens dual effects: wax esters and stratum corneum lipids enhance film adhesion; the porous structure of rice starch and silica form a "dual anchoring" effect for the sunscreen agent. Ultimately, a complete action chain is formed, combining excellent water and sweat resistance with enhanced sun protection efficacy.

[0008] Specifically, the rice starch described in this invention, as a natural high-molecular-weight polysaccharide raw material, has three core advantages: First, it has excellent film-forming properties, providing a basic protective framework for the composition, and the film layer adheres well to the skin without feeling heavy; second, it has outstanding adsorption properties, and its porous structure can act as an "anchor point" to adsorb other raw materials and sunscreen agents in the formula, reducing ingredient loss; third, it has high safety, derived from natural grains, with good biocompatibility, and can even be used on sensitive skin.

[0009] Specifically, the candelilla wax described in this invention has distinct structural advantages: its melting point is stable at 65-73℃, and it can slowly melt without liquefying at skin temperature, forming a dense film with high hardness, significantly improving the composition's resistance to friction and erosion, which is key to improving its water and sweat resistance; secondly, candelilla wax can promote crystal nucleation and growth, forming a dense, orderly crystal network. This orderly structure can be transformed into a uniform protective film in sunscreen products, significantly enhancing the system's film-forming properties and water and sweat resistance, while reducing UV penetration; furthermore, its wax ester components can enhance the hydrophobicity of the film, reducing water and sweat penetration, while its low refractive index means that when compounded with other raw material components, it will not affect the product's transparency or exacerbate the whitening phenomenon of physical sunscreens.

[0010] Specifically, the sunflower seed wax described in this invention, as a high-melting-point plant wax (74-80℃), has the core advantages of excellent extensibility and stability: the long-chain unsaturated fatty acid structure gives the formed film good tensile properties, which can be adapted to skin activity scenarios such as sports, and prevent the protective film from cracking due to limb stretching; at the same time, its fatty acid composition is somewhat similar to the lipids of the stratum corneum of the skin, which can enhance the adhesion between the film and the skin and prolong the protective effect; in addition, it has strong antioxidant properties, which can protect other active ingredients in the formula from being rapidly oxidized, indirectly improving the stability of the product.

[0011] Specifically, the silica described in this invention possesses unique value due to its micron-level porous structure: First, it exhibits excellent dispersibility, with its porous surface capable of adsorbing and uniformly bearing sunscreen particles, effectively preventing sunscreen particles from agglomerating and forming "protective blind spots," thus improving UV blocking efficiency; second, it provides good support, with particles embedding into the membrane layer to form "micro-scaffolds," maintaining the membrane's loose structure, ensuring breathability while preventing the membrane from collapsing when exposed to water; and third, it optimizes the skin feel, reducing the stickiness that wax-based ingredients may cause, making the product smoother after application, while also possessing a certain oil-absorbing capacity, making it suitable for oily skin.

[0012] Specifically, the beeswax described in this invention, as a natural emulsifying and film-forming dual-effect raw material, has advantages in synergistic compatibility: firstly, it has strong emulsifying compatibility, and the ester components it contains can reduce the interfacial tension between oil and water, enabling the composition to achieve uniform fusion and avoiding formula stratification; secondly, it has a film-forming auxiliary effect, and when compounded with other waxes, it can adjust the balance between the hardness and flexibility of the film layer, further enhancing the adhesion of the film layer; and thirdly, it has high natural safety and also has a slight moisturizing effect.

[0013] In some embodiments of the present invention, the composition comprises, by weight parts, the following components: 10-20 parts rice starch, 0.5-5 parts candelilla wax, 0.5-5 parts sunflower seed wax, 2-10 parts silica, and 0.5-5 parts beeswax.

[0014] In some embodiments of the present invention, the composition comprises, by weight parts, the following components: 12-18 parts rice starch, 1-3 parts candelilla wax, 1-3 parts sunflower seed wax, 4-8 parts silica, and 2-4 parts beeswax.

[0015] A second aspect of the present invention provides a method for preparing the composition with enhanced water and sweat resistance and sun protection as described in the first aspect of the present invention, comprising the following steps: The components are mixed to obtain the composition.

[0016] In some embodiments of the present invention, the method for preparing the composition includes the following steps: The components are mixed, heated to 80-85°C, and stirred until homogeneous to obtain the composition.

[0017] A third aspect of the present invention provides the use of the composition for enhancing water and sweat resistance and sun protection as described in the first aspect of the present invention in the preparation of cosmetics having water and sweat resistance and sun protection effects.

[0018] In a fourth aspect, the present invention provides a cosmetic product comprising the water-resistant and sweat-resistant composition with enhanced sun protection as described in the first aspect of the present invention.

[0019] In some embodiments of the present invention, the composition has a mass content of 15%-30% in cosmetics.

[0020] Specifically, the mass content of the composition in the cosmetic can be any point value or any two-point range value between 15% and 30%, such as 15%, 20%, 25%, 30%, etc.

[0021] In some embodiments of the present invention, the cosmetic also includes sunscreen, emollient and thickener.

[0022] In some embodiments of the present invention, the sunscreen agent includes at least one of ethylhexyl triazine ketone, isoamyl p-methoxycinnamate, hexyl diethylamino hydroxybenzoyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, and octocrylene; preferably, it includes at least two of ethylhexyl triazine ketone, isoamyl p-methoxycinnamate, hexyl diethylamino hydroxybenzoyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, and octocrylene; more preferably, it includes at least three of ethylhexyl triazine ketone, isoamyl p-methoxycinnamate, hexyl diethylamino hydroxybenzoyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, and octocrylene.

[0023] In some embodiments of the present invention, the emollient includes at least one selected from isononyl isononanoate, diisopropyl sebacate, diisopropyl adipate, butyl octyl salicylate, polydimethylsiloxane, and isododecane.

[0024] In some embodiments of the present invention, the thickener comprises synthetic wax.

[0025] In some embodiments of the present invention, the sunscreen agent has a mass content of 15-20% in the cosmetic.

[0026] In some embodiments of the present invention, the dosage form of the cosmetic includes creams, lotions, gels, or sticks.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows: The composition of this invention contains rice starch, candelilla wax, sunflower seed wax, silica, and beeswax. This unique combination of ingredients creates a good synergistic effect among the components, as detailed below: 1) Water and sweat resistance: Construction of a multi-layered, dense protective film The five raw material components mentioned above form a closed-loop anti-water and sweat barrier through a hierarchical "skeleton-filling-reinforcement" process: rice starch first forms a continuous base film layer, constructing an initial protective barrier; candelilla wax and sunflower seed wax, compounded with gradient melting points, fill the pores of the starch film layer, with candelilla wax increasing the film layer's hardness and erosion resistance, and sunflower seed wax enhancing its extensibility and preventing cracking, forming a dense hydrophobic layer; beeswax, through emulsification, tightly bonds each film layer together, while also enhancing the adhesion between the film layer and the skin, preventing the film layer from detaching due to water and sweat; silica embedded in the film layer provides structural support, preventing the film layer from collapsing after immersion in water, ensuring the integrity of the protective film. Tests showed that the film layer formed by this combination maintained more than 85% integrity after an 8-hour simulated sweating test (Example 2), far superior to the film-forming effect of single components or combinations of other components. 2) Enhanced sun protection performance: Achieving efficient utilization of sunscreen agents The synergistic effect of "dispersion-anchoring-locking" among raw materials enhances sun protection efficiency: The porous structure of silica evenly disperses the sunscreen agents in the sunscreen product, allowing all sunscreen particles to fully contact ultraviolet rays, thus improving the protective efficiency of the sunscreen agents compared to the undispersed state; the adsorption properties of rice starch and the adhesive properties of beeswax form "dual anchoring," firmly fixing the dispersed sunscreen agents in the film layer, preventing them from being washed away by water and sweat or migrating due to friction; at the same time, the dense film structure slows down the degradation rate of sunscreen agents by ultraviolet rays, prolonging the sun protection time. This synergistic effect allows the composition of the present invention to achieve the same or even higher SPF while reducing the amount of sunscreen agents added, while reducing problems such as whitening and irritation caused by high concentrations of sunscreen agents. Detailed Implementation

[0028] The present invention will be further described in detail below through specific embodiments. Unless otherwise specified, the raw materials, reagents, or apparatus used in the embodiments can be obtained from conventional commercial sources or by existing technical methods. Unless otherwise specified, the experimental or testing methods are conventional methods in the art.

[0029] Example 1 A composition for enhanced water and sweat resistance and sun protection comprises the following components in parts by weight: 10 parts rice (ORYZASATIVA) starch, 0.5 parts candelilla (EUPHORBIA CERIFERA) wax, 0.5 parts sunflower (HELIANTHUS ANNUUS) seed wax, 2 parts silica, and 0.5 parts beeswax.

[0030] The composition of this embodiment can be prepared by mixing the components, heating to 80°C, and stirring until homogeneous.

[0031] Example 2 A composition for enhanced water and sweat resistance and sun protection comprises the following components in parts by weight: 20 parts rice (ORYZASATIVA) starch, 5 parts candelilla (EUPHORBIA CERIFERA) wax, 5 parts sunflower (HELIANTHUS ANNUUS) seed wax, 10 parts silica, and 5 parts beeswax.

[0032] The composition of this embodiment can be prepared by mixing the components, heating to 83°C, and stirring until homogeneous.

[0033] Example 3 A composition for enhanced water and sweat resistance and sun protection comprises the following components in parts by weight: 15 parts rice (ORYZASATIVA) starch, 2 parts candelilla (EUPHORBIA CERIFERA) wax, 2 parts sunflower (HELIANTHUS ANNUUS) seed wax, 6 parts silica, and 2 parts beeswax.

[0034] The composition of this embodiment can be prepared by mixing the components, heating to 85°C, and stirring until homogeneous.

[0035] Comparative Example 1 The only difference from Example 1 is that it does not contain rice (ORYZA SATIVA) starch.

[0036] Comparative Example 2 The only difference from Example 1 is that it does not contain candelilla ceripera wax.

[0037] Comparative Example 3 The only difference from Example 1 is that it does not contain sunflower (HELIANTHUS ANNUUS) seed wax.

[0038] Comparative Example 4 The only difference from Example 1 is that it does not contain silica.

[0039] Comparative Example 5 The only difference from Example 1 is that it does not contain beeswax.

[0040] Comparative Example 6 The only difference from Example 1 is that rice (ORYZA SATIVA) starch is replaced in equal amounts with corn starch, which has similar effects.

[0041] Comparative Example 7 The only difference from Example 1 is that the candelilla ceripera wax is replaced in equal amounts with a microcrystalline wax with similar effects.

[0042] Comparative Example 8 The only difference from Example 1 is that the sunflower (HELIANTHUS ANNUUS) seed wax is replaced in an equal amount with sunflower seed oil, which has similar effects.

[0043] Comparative Example 9 The only difference from Example 1 is that silica is replaced in equal amounts with kaolin with similar effects.

[0044] Comparative Example 10 The only difference from Example 1 is that beeswax is replaced in equal amounts with terrestris, which has similar effects.

[0045] Application Example 1 Sunscreen sticks were prepared using the composition obtained in Example 1 of the present invention, and the formulation of the sunscreen sticks is shown in Table 1.

[0046] Table 1

[0047] The preparation method of the sunscreen stick in Application Example 1 is as follows: (1) Ethylhexyl triazine, p-methoxycinnamate, diethylamino hydroxybenzoyl hexyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, isononyl isononanoate, octocrylene, diisopropyl sebacate, diisopropyl adipate and butyl octyl salicylate are added to the emulsification pot in sequence, the temperature is raised to 80°C, and the mixture is stirred until the material is completely dissolved and transparent, and then kept warm. (2) The synthetic wax and the composition of Example 1 are sequentially added to the emulsification pot of step (1), stirred and heated to 85°C, and kept warm and stirred until dissolved and uniform. (3) Polydimethylsiloxane and isododecane are sequentially added to the emulsification pot of step (1), the temperature is controlled at 85°C, homogenized (2500 rpm) for 8 min, the material is evenly dispersed, and then filled into the packaging material while hot to obtain sunscreen stick.

[0048] Application Example 2 The only difference from Application Example 1 is that the composition of Example 1 is replaced with the composition of Example 2 in equal amounts, while the other components, contents and preparation methods remain unchanged.

[0049] Application Example 3 The only difference from Application Example 1 is that the composition of Example 1 is replaced with the composition of Example 3 in equal amounts, while the other components, contents and preparation methods remain unchanged.

[0050] Application Comparative Example 1 The only difference from Application Example 1 is that the composition of Example 1 is replaced with the composition of Comparative Example 1 in equal amounts, while the other components, contents and preparation methods remain unchanged.

[0051] Application Comparative Example 2 The only difference from Application Example 1 is that the composition of Example 1 is replaced with the composition of Comparative Example 2 in equal amounts, while the other components, contents and preparation methods remain unchanged.

[0052] Application Comparative Example 3 The only difference from Application Example 1 is that the composition of Example 1 is replaced with the composition of Comparative Example 3 in equal amounts, while the other components, contents and preparation methods remain unchanged.

[0053] Application Comparative Example 4 The only difference from Application Example 1 is that the composition of Example 1 is replaced with the composition of Comparative Example 4 in equal amounts, while the other components, contents and preparation methods remain unchanged.

[0054] Application Comparative Example 5 The only difference from Application Example 1 is that the composition of Example 1 is replaced with the composition of Comparative Example 5 in equal amounts, while the other components, contents and preparation methods remain unchanged.

[0055] Application Comparative Example 6 The only difference from Application Example 1 is that the composition of Example 1 is replaced with the composition of Comparative Example 6 in equal amounts, while the other components, contents and preparation methods remain unchanged.

[0056] Application Comparative Example 7 The only difference from Application Example 1 is that the composition of Example 1 is replaced with an equal amount of the composition of Comparative Example 7, while the other components, contents and preparation methods remain unchanged.

[0057] Application Comparative Example 8 The only difference from Application Example 1 is that the composition of Example 1 is replaced with an equal amount of the composition of Comparative Example 8, while the other components, contents and preparation methods remain unchanged.

[0058] Application Comparison Example 9 The only difference from Application Example 1 is that the composition of Example 1 is replaced with the composition of Comparative Example 9 in equal amounts, while the other components, contents and preparation methods remain unchanged.

[0059] Application Comparison Example 10 The only difference from Application Example 1 is that the composition of Example 1 is replaced with an equal amount of the composition of Comparative Example 10, while the other components, contents and preparation methods remain unchanged.

[0060] Application Comparative Example 11 The only difference from Application Example 1 is that the composition of Example 1 is not added, while the other components, contents and preparation methods remain unchanged.

[0061] Test Example 1: Sunscreen Performance Test 1) SPF value determination Test samples: sunscreen sticks prepared using Examples 1-3 and Comparative Examples 1-11.

[0062] Reference standard: SPF value is 16.1±2.4, prepared according to the standard formula of high SPF standard (P2) in the "Cosmetic Safety Technical Specifications" (2015 edition).

[0063] Participants: A total of 42 participants, 18 males and 24 females, aged 24 to 52 years, with a mean age of 35.4 ± 10.0 years, who met the voluntary inclusion criteria. Participants tested each group of samples in turn.

[0064] Light source: Xenon arc lamp from a daylight simulator; all performance indicators meet the requirements of the testing specifications.

[0065] Test Method: The test was conducted according to the specific requirements of the "Cosmetic Safety Technical Specifications" (2015 edition). Subjects were placed in a prone position, and their backs were irradiated. The minimum erythema dose (MED) of the subject's skin to ultraviolet radiation was predicted 24 hours prior to the test, and the ultraviolet radiation dose was adjusted based on the prediction result for testing the test substance. On the day of the test, a spot no less than 30cm long was first selected on the subject's back. 2 In normal skin areas, at (2.00±0.05) mg / cm² 2 Apply the test substance or control evenly to the above-mentioned area, and then select the irradiation dose according to the standard requirements. Irradiation is carried out under three conditions: 1. No test substance is applied to the subject's skin; 2. Control substance is applied; 3. Test substance is applied. Observe the experimental results after 24 hours and record the MED values ​​under the three conditions.

[0066] 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. The arithmetic mean of the SPF values ​​of all subjects protected by the test substance is calculated, and the integer part is taken as the SPF value of the tested 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 until this requirement is met. The test results are shown in Table 2.

[0067] Table 2

[0068] 2) PFA value determination Test samples: sunscreen sticks prepared using Examples 1-3 and Comparative Examples 1-11.

[0069] Reference standard: PFA value 4.4±0.6, prepared according to the standard formula of PFA determination standard in the "Cosmetic Safety Technical Specifications" (2015 edition).

[0070] Participants: A total of 42 participants, including 13 males and 29 females, aged 18 to 51 years, with a mean age of 36.1 ± 11.3 years. They met the criteria for voluntary inclusion and were tested on samples from each group in turn.

[0071] Light source: Xenon arc lamp from a daylight simulator; all performance indicators meet the requirements of the testing specifications.

[0072] Test Method: The test was conducted according to the specific requirements of the "Cosmetic Safety Technical Specifications" (2015 edition). The subject was placed in a prone position, and their back was irradiated. The minimum melanization potential (MPPD) of the subject's skin to ultraviolet radiation was predicted 24 hours prior to the test, and the ultraviolet radiation dose was adjusted based on the prediction result for testing the test substance. The test was first conducted by selecting a spot at least 30cm long on the subject's back. 2 For normal skin areas, administer (2.00±0.05) mg / cm². 2 Apply the test substance or control evenly to the above-mentioned area; then select the UVA irradiation dose according to the standard requirements and irradiate under three conditions: 1. No test substance applied to the subject's skin; 2. Control applied; 3. Test substance applied. Observe the experimental results after 4 hours and record the MPPD values ​​under the three conditions.

[0073] PFA value calculation method: The PFA value of the analyte or control for protecting a single subject is expressed by the following formula: ; The test results are shown in Table 3.

[0074] Table 3

[0075] Test Example 2: Water and Sweat Resistance Test Test samples: sunscreen sticks prepared using Examples 1-3 and Comparative Examples 1-11.

[0076] Test method: Apply test samples to the rough surface of a PMMA plate, then use a finger wearing a latex medical finger cot to spread the sample evenly. The sample dosage should be controlled at 2 mg / cm³. 2The sample must not contain air bubbles. Then, place the PMMA plate in an environment with room temperature (20–30℃) and relative humidity of 40%–60% for 15 minutes. After calibrating the HQ-UV-2000S ultraviolet transmittance analyzer, test the SPF value of each sample (no fewer than 5 measurement points per sample, and take the average result). This is the in vitro SPF value before contact with water and sweat. After measuring the SPF value before contact with water and sweat, immerse the PMMA plate in artificial sweat at 35℃ and stir at 250 r / min for 8 hours. Remove the PMMA plate and dry it until the water droplets on its surface disappear. Use the HQ-UV-2000S ultraviolet transmittance analyzer to measure its SPF value (no fewer than 5 measurement points per sample, and take the average result). This is the SPF value after contact with water and sweat. The formula for calculating water and sweat resistance is as follows: Water and sweat resistance rating = [1 - (SPF value before water and sweat - SPF value after water and sweat) / SPF value before water and sweat] × 100%; The test results are shown in Table 4.

[0077] Table 4

[0078] Experimental Example 3: Human Skin Patch Test Test samples: sunscreen sticks prepared using Examples 1-3 and Comparative Examples 1-11.

[0079] Negative control: Blank control.

[0080] Participants: A total of 30 people (each patch can be used to test multiple samples), 3 males and 27 females, aged 28 to 59 years, with a mean age of 42.4 ± 9.5 years, who met the criteria for voluntary inclusion.

[0081] Patch test method: Select qualified patch test equipment and use the closed patch test method. Place 0.02g of the test substance in the patch test device and apply it to the back of the subject with hypoallergenic adhesive tape. Remove the test substance after 24 hours. Observe the skin reaction at 0.5, 24 and 48 hours after removal. Record the test results according to the skin reaction grading standard in the "Cosmetic Safety Technical Specifications" (2015 edition) (as shown in Table 5), as shown in Table 6.

[0082] Table 5

[0083] Table 6

[0084] Test Example 4: Repeated Skin Irritation Tests Test samples: Sunscreen sticks prepared in Application Examples 1-3 and Application Comparative Examples 1-11.

[0085] 1. Information on experimental animals Species: Rabbit; Strain: New Zealand rabbit; Level: Ordinary level; Number of animals: 56, and female animals selected are non-pregnant and have never given birth; Body weight: 2.3 kg - 2.5 kg; Source: Changyi Experimental Animal Breeding Co., Ltd., Danyang City; License number for the production of experimental animals: SCXK (Jiangsu) 2021-0002; Quality certificate number: N0.202329951.

[0086] 2. Information on the feeding environment Temperature: 20.0°C - 25.6°C; Relative humidity: 47.4% - 69.8%; License number for the use of the experimental animal environment: SYXK (Jiangsu) 2020-0017.

[0087] 3. Information on feed Feed source: Suzhou Anmufei Biotechnology Co., Ltd.; Feed certificate of conformity: R02-20230329002.

[0088] 4. Test method: Multiple skin irritation tests were carried out in accordance with the "Technical Specifications for Cosmetics Safety" (2015 edition). Before the test, the animals were acclimated in the experimental animal house environment for 3 days. Approximately 24 hours before the test, the hair on both sides of the spine of the experimental animals was shaved off, and the hair removal area was about 3 cm × 3 cm on each side. During the test, 0.5 g of the test substance was applied to the left skin, and the application area was about 2.5 cm × 2.5 cm. The right skin was used as a control. It was applied once a day for 14 consecutive days. Starting from the second day, the hair was shaved before each application, and the residual test substance was removed with olive oil. The skin reaction was observed one hour later. The skin irritation reaction was scored according to Table 1 in Chapter 6, 4 Skin Irritation / Corrosion Test of the "Technical Specifications for Cosmetics Safety" (2015 edition). The average score of each animal per day was calculated according to the formula, and the skin irritation intensity was classified according to Table 2.

[0089] The results showed that the sunscreen stick samples prepared in Application Examples 1-3 and Application Comparative Examples 1-10 had no irritation in the multiple skin irritation test on rabbits; while slight erythema occurred in the rabbits tested in Application Comparative Example 11, and the average score was 0.5 - <2.0, and the test result was mild irritation.

[0090] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A water resistant perspiration and sunscreen boosting composition characterized in that, The composition comprises the following components: rice starch, candelilla wax, sunflower seed wax, silica and beeswax.

2. The water-resistant, sweat and sunscreen boosting composition according to claim 1, wherein, The composition comprises the following components in parts by mass: rice starch 10-20 parts, candelilla wax 0.5-5 parts, sunflower seed wax 0.5-5 parts, silica 2-10 parts and beeswax 0.5-5 parts.

3. The water-resistant, sweat and sunscreen boosting composition according to claim 2, wherein, The composition comprises the following components in parts by mass: rice starch 12-18 parts, candelilla wax 1-3 parts, sunflower seed wax 1-3 parts, silica 4-8 parts and beeswax 2-4 parts.

4. A process for the preparation of the water resistant perspiration and sunscreen booster composition according to any one of claims 1 to 3, characterized in that, The method comprises the following steps: The components are mixed to obtain the composition.

5. Use of the water-resistant sweat and sunscreen synergistic composition according to any one of claims 1-3 in the preparation of a cosmetic product having water-resistant sweat and sunscreen efficacy.

6. A cosmetic product, characterized by, The cosmetic product comprises the water-resistant sweat and sunscreen synergistic composition according to any one of claims 1-3.

7. The cosmetic product according to claim 6, characterized in that, The mass content of the composition in the cosmetic product is 15-30%.

8. The cosmetic product according to claim 6, characterized in that, The cosmetic product further comprises a sunscreen agent, an emollient and a thickening agent.

9. The cosmetic product according to claim 8, characterized in that, The sunscreen agent comprises at least one of ethylhexyl triazone, isoamy! p-methoxy cinnamate, diethylamino hydroxybenzoyl hexyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine and octocrylene; the emollient comprises at least one of isononyl isononanoate, diisopropyl sebacate, diisopropyl adipate, butyloctyl salicylate, dimethicone and isododecane; and the thickening agent comprises synthetic wax.

10. The cosmetic product according to claim 6, characterized in that, The dosage form of the cosmetic product comprises a cream, a lotion, a gel or a stick.

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