Sun-screening agent composition based on synergistic stabilization of sodium oleate and chondroitin sulfate as well as preparation method and application of sun-screening agent composition

Abstract

The invention belongs to the technical field of cosmetics, and discloses a sunscreen composition based on synergistic stabilization of sodium oleate and chondroitin sulfate as well as a preparation method and application of the sunscreen composition, and the composition comprises a sunscreen, an emulsifier (containing sodium oleate), grease, a thickener (containing chondroitin sulfate or salt thereof), a humectant, a preservative and water. Through the synergistic effect of static electricity and steric hindrance between sodium oleate and chondroitin sulfate and in cooperation with specific soluble grease (such as dibutyl adipate and neopentyl glycol dicaprate) and high-volatility grease (C10-13 isoparaffin), the composition remarkably improves the dissolution stability of a solid chemical sun-screening agent in a system; crystallization and precipitation in high and low temperature environments are effectively prevented, greasy feeling brought by a high-content liquid sun-screening agent is overcome, and the product is endowed with refreshing skin feeling. The composition is emulsion with good fluidity, supports a cold processing technology, is conveniently and directly added into various sunscreen cosmetics, and is simple and convenient to apply.

Description

Technical Field

[0001] This invention belongs to the field of cosmetic technology, specifically relating to a sunscreen composition based on the synergistic stabilization of sodium oleate and chondroitin sulfate, its preparation method, and its application. Background Technology

[0002] Cosmetic products typically contain several sunscreen agents to reflect or absorb ultraviolet (UV) rays, thus protecting the skin. Common sunscreen agents are divided into physical and chemical sunscreens. Chemical sunscreens are easily dispersed, come in many varieties, offer protection against a wide range of UV wavelengths, and generally feel better on the skin than physical sunscreens, without leaving a white cast. They hold a crucial position in sun protection products.

[0003] However, some chemical sunscreen agents, such as bis-ethylhexyloxyphenol methoxyphenyl triazine, diethylaminohydroxybenzoylhexyl benzoate, avobenzone, and diethylhexylbutamidotriazinone, are in the form of large molecular solid powders and have poor solubility in oils. Sunscreen products are prone to crystallization, precipitation, layering, and discoloration at high or low temperatures, affecting shelf life and product stability. The principle of "like dissolves like" can be used to dissolve solid sunscreen agents in oil-based liquid sunscreens, significantly improving solubility stability. However, this results in a less desirable skin feel, and oil-based sunscreens can lead to a greasy and heavy feel on the skin. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention provides a sunscreen composition based on the synergistic stabilization of sodium oleate and chondroitin sulfate, its preparation method, and its application. This significantly improves the solubility stability of the sunscreen in emulsion formulations, solves the problems of crystallization and precipitation in solid sunscreens, and alleviates the greasy feel caused by high-concentration liquid sunscreens.

[0005] To achieve the objectives of this invention, the invention includes the following technical solutions:

[0006] A sunscreen composition based on the synergistic stabilization of sodium oleate and chondroitin sulfate, comprising the following components by weight percentage:

[0007] Sunscreen agents 20-40%;

[0008] Emulsifier 6.5-10%, which includes sodium oleate;

[0009] Oil content 21-35%;

[0010] Thickener 0.01-3%, containing chondroitin sulfate or its salt;

[0011] Moisturizer 1-8%;

[0012] Preservative 0.1%;

[0013] The remainder is water.

[0014] Furthermore, in the above-mentioned sunscreen composition, the sunscreen agent includes a solid sunscreen agent and a liquid sunscreen agent. The solid sunscreen agent is selected from two of the following: bis-ethylhexyloxyphenol methoxyphenyl triazine, diethylamino hydroxybenzoyl hexyl benzoate, avobenzone, and diethylhexylbutamidotriazine ketone. The liquid sunscreen agent is selected from octocrylene and isooctyl p-methoxycinnamate. The weight ratio of the solid sunscreen agent to the liquid sunscreen agent is 1:1 to 2:1.

[0015] Furthermore, in the above-mentioned sunscreen composition, the content of sodium oleate in the emulsifier is 1.5-3%, and the emulsifier also contains 1-2% hydrogenated lecithin and 4-5% cetearyl alcohol polyether-20.

[0016] Furthermore, in the above-mentioned sunscreen composition, the content of sodium chondroitin sulfate in the thickener is 0.01-0.2%, and the thickener also contains 0.01-0.1% sodium hyaluronate.

[0017] Furthermore, in the above-mentioned sunscreen composition, the oil comprises 8-10% dibutyl adipate, 8-15% C10-13 isoparaffin, and 5-10% neopentyl glycol didecanoate.

[0018] Furthermore, in the above-mentioned sunscreen composition, the moisturizer includes 0.5-2% propylene glycol and 0.5-3% pentanediol; the preservative is phenoxyethanol.

[0019] This invention also discloses a method for preparing the above-mentioned sunscreen composition, comprising the following steps:

[0020] S1: Dissolve and mix solid sunscreen, liquid sunscreen, and oil at 80°C until homogeneous to form the oil phase;

[0021] S2: Dissolve and mix the emulsifier, thickener, humectant, and water at 80°C until homogeneous to form the aqueous phase;

[0022] S3: Add the oil phase to the aqueous phase for homogenization;

[0023] S4: Cool the obtained material to below 45℃, add preservative, replenish the balance with water, and discharge the material.

[0024] The present invention also discloses the application of the above-mentioned sunscreen composition in cosmetics.

[0025] The present invention also discloses a sunscreen lotion comprising the above-mentioned sunscreen composition, wherein, by weight percentage, the sunscreen lotion further comprises:

[0026] Emulsifiers: 2% total of cetearyl alcohol and cetearyl glucoside;

[0027] Oils: Caprylic / Capric triglycerides 5%, Polydimethylsiloxane 3%;

[0028] Glycerin 2%;

[0029] EDTA-2Na 0.05%;

[0030] Preservative 0.5%;

[0031] The sunscreen composition is 20-30%;

[0032] The remainder is water.

[0033] This invention also discloses a method for preparing the above-mentioned sunscreen lotion, comprising the following steps:

[0034] S1: Add the emulsifiers cetearyl alcohol and cetearyl glucoside to caprylic / capric triglyceride and polydimethylsiloxane, and dissolve and mix them evenly at 80°C to form the oil phase;

[0035] S2: Dissolve and mix glycerol, EDTA-2Na, and water at 80℃ until homogeneous to form the aqueous phase;

[0036] S3: Add the oil phase to the aqueous phase for homogenization;

[0037] S4: Cool the obtained material to below 45°C, add the sunscreen composition and preservative described in this invention, add water to make up the balance, and discharge the material.

[0038] Compared with the prior art, the present invention has the following outstanding advantages:

[0039] (1) The synergistic effect of sodium oleate, chondroitin sulfate, and oils improved the solubility stability of solid, easily crystallizing sunscreens. Sodium oleate is a plant-derived long-chain anionic soap with surface activity, commonly used as a co-emulsifier and cleanser in cosmetics. Chondroitin sulfate is an anionic high-molecular-weight natural polysaccharide with moisturizing and thickening effects. The anionic properties of sodium oleate can form electrostatic interactions with chondroitin sulfate, and the long carbon chain can also form a steric hindrance effect with the large molecule of chondroitin sulfate, preventing the aggregation of oil phase particles carrying sunscreens, forming crystal nuclei, and causing the sunscreen to precipitate and degrade its stability. Chondroitin sulfate is a plant-derived high-molecular-weight polysaccharide, which also provides a certain viscosity, slowing down the tendency of oil phase particles to aggregate and improving the stability of the system. The oils selected are a combination of dibutyl adipate and neopentyl glycol didecanoate, which have better solubility for solid sunscreens and have higher solubility stability than traditional C12-15 benzoyl alcohol esters.

[0040] (2) The sunscreen composition based on the synergistic stabilization of sodium oleate and chondroitin sulfate, its preparation method, and its application provided by this invention simultaneously improve the greasy feel of sunscreen products. The system is compounded with highly volatile C10-13 isoparaffins, enhancing the refreshing feel of the composition. The dibutyl adipate and neopentyl glycol didecanoate also have a relatively light feel, similar to traditional caprylic / capric triglycerides, without any greasiness or heaviness.

[0041] (3) The sunscreen composition based on the synergistic stability of sodium oleate and chondroitin sulfate and the preparation method thereof provided by the present invention is in the form of an emulsion, with good fluidity, easy to add materials, supports cold preparation process, and is convenient to use. Attached Figure Description

[0042] Figure 1 Example 4, photographs of blank examples 1-4;

[0043] Figure 2 Example 4, Microscopic photographs of blank examples 1-2;

[0044] Figure 3 Skin feel test results of Example 4 and the control formula. Detailed Implementation

[0045] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] The materials used in the embodiments of the present invention are shown in Table 1.

[0047] Table 1: Main experimental materials used and their sources

[0048] Main experimental instruments used:

[0049] Vacuum drying oven, constant temperature water bath, high shear homogenizer, mixer, etc.

[0050] Examples 1-7

[0051] The sunscreen composition based on the synergistic stabilization of sodium oleate and chondroitin sulfate described in the following examples includes the following steps: According to the formulation in Table 2, the components of phase A and phase B are mixed evenly. Phase A is then added to phase B at 80°C, and homogenized 6 times, 40 seconds each time, at a speed of 10,000 rpm. The mixture is cooled to below 45°C, phase C is added, and purified water is used to make up the remaining volume. The mixture is then discharged. Examples 1-3 involve adding only one solid sunscreen agent, Examples 4-6 involve adding two solid sunscreen agents, and Example 7 involves adding three solid sunscreen agents.

[0052] Blank example 1-4

[0053] The methods for improving the solubility stability of sunscreen agents described in Blank Examples 1-4 are the same as those in Example 4. Blank Example 1 did not contain chondroitin sulfate, Blank Example 2 did not contain sodium oleate, Blank Example 3 did not contain DBA, and Blank Example 4 did not contain neopentyl glycol didecanoate.

[0054] Comparative Examples 1-5

[0055] The methods for improving the solubility stability of sunscreen agents described in Comparative Examples 1-5 are the same as those in Example 4. Specifically, in Comparative Example 1, the amount of DBA added was adjusted to 8%; in Comparative Example 2, the amount of neopentyl glycol didecanoate added was adjusted to 7%; in Comparative Example 3, the amount of sodium oleate added was adjusted to 1%; in Comparative Example 4, the ratio of DBA to neopentyl glycol didecanoate was increased to 2:1, but the total amount remained unchanged; and in Comparative Example 5, the amount of chondroitin sulfate added was adjusted to 0.05%.

[0056] Table 2: Formulations of sunscreen compositions based on the synergistic stabilization of sodium oleate and chondroitin sulfate

[0057] Table 3: Additive amounts of easily crystallizing solid sunscreens, sodium chondroitin sulfate, sodium oleate, DBA oils, and neopentyl glycol didecanoate.

[0058] Test Example 1:

[0059] Stability evaluation of sunscreen compositions based on the synergistic stabilization of sodium oleate and chondroitin sulfate.

[0060] The stability of sunscreen compositions based on the synergistic stabilization of sodium oleate and chondroitin sulfate was evaluated in accordance with the methods in T / SHFCA 002-2021 "Guidelines for Stability Testing of Cosmetics".

[0061] 1. Test items and operating procedures

[0062] 1.1 Influencing Factors Experiment

[0063] 1.1.1 High Temperature Stability

[0064] Place the sample in a sealed, clean container and then in a constant temperature incubator pre-adjusted to (45℃±2℃) for 30 days. Take samples on days 5, 10, 20, and 30. After the test, return the sample to room temperature and observe its color, odor, and whether it has separated into layers.

[0065] 1.1.2 Temperature stability

[0066] Place the sample in a sealed, clean container, then place it in a constant temperature incubator pre-adjusted to (45℃±2℃) for 24 hours. After 24 hours, remove the sample and place it in a refrigerator pre-adjusted to (-5℃±2℃) for 24 hours. Remove the sample again and place it in a constant temperature incubator at (40℃±2℃) for 24 hours. Repeat this cycle 5-7 times. After the test, return the sample to room temperature and observe its color, odor, and whether it has separated into layers.

[0067] 1.2 Accelerated stability test

[0068] The samples were placed in a constant temperature and humidity chamber and tested for 6 months at 40℃±2℃ and 75%±5% relative humidity. At least 4 time points (e.g., 1, 2, 3, 6 m) were measured, and the samples were compared with room temperature and 0 m to observe the color, odor, and presence of stratification.

[0069] 1.3 Long-term stability test

[0070] The samples were placed in a constant temperature and humidity chamber and tested for 24 months at a temperature of 25℃±2℃ and a relative humidity of 60%±10%. Samples were taken at 3, 6, 9, 12, 18 and 24 m, and compared with room temperature and 0 m to observe the color, odor and whether there was stratification.

[0071] 2. Experimental Results

[0072] The stability evaluation results of the sunscreen composition based on the synergistic stabilization of sodium oleate and chondroitin sulfate are shown in Table 4 and... Figure 1-2 .

[0073] Table 4: Stability Evaluation Results of Sunscreen Compositions Based on the Synergistic Stabilization of Sodium Oleate and Chondroitin Sulfate

[0074] As shown in Table 4, no abnormalities occurred in any of the stability evaluation tests for Examples 1-7, indicating excellent stability. This demonstrates that the method for improving the solubility stability of sunscreen agents described in Examples 1-7 is effective and feasible. The system remains stable within a ratio of solid sunscreen agent to liquid sunscreen agent ranging from 1:1 to 2:1.

[0075] The poor stability observed in blank examples 1-4 and comparative examples indicates that the interaction between chondroitin sulfate and sodium oleate, as well as the specific ratio of oils, can affect the solubility of solid sunscreens, leading to precipitation in high and low temperature environments and affecting the stability of the system.

[0076] Comparative Examples 1, 2, 3, and 5 reduced the amounts of DBA, neopentyl glycol didecanoate, sodium oleate, and chondroitin sulfate, respectively, resulting in poor system stability. This indicates that chondroitin sulfate, sodium oleate, and sunscreen oils need to be added in certain amounts to maintain system stability. Comparative Example 4 changed the ratio of the two dissolved oils from 5:4 to 2:1, but the total amount of oil added remained unchanged. The stability experiment showed that the system did not separate, indicating that the ratio of the two oils does not affect the solubility stability of the solid sunscreen agent, while the total amount added does.

[0077] Figure 1 The images show the samples from Example 4 and Blank Examples 1-4. It is clear that when the system does not contain sodium oleate, chondroitin sulfate, dibutyl adipate (DBA), or neopentyl glycol didecanoate (Blank Examples 1-4), the system stability is poor, and emulsion separation occurs in all cases. Figure 2 These are microscopic images of Example 4 and Blank Examples 1-2. When the system does not contain sodium oleate and chondroitin sulfate, the stability decreases. Compared with Example 4, the number of emulsion particles in Blank Examples 1-2 is significantly reduced, and some sunscreen crystals can be observed to precipitate, indicating the importance of sodium oleate and chondroitin sulfate to the emulsion stability of the system.

[0078] Test Example 2:

[0079] Safety evaluation of sunscreen compositions based on the synergistic stabilization of sodium oleate and chondroitin sulfate.

[0080] This experimental example uses a closed patch test, referring to the closed patch test method provided in the "Cosmetic Safety Technical Specifications," to test the irritation of the composition prepared by the method for improving the solubility stability of sunscreens on human skin.

[0081] 1. Materials and Reagents

[0082] 1.1 Spot Tester

[0083] This experiment uses the international standard Finn-Chamber, made of aluminum, with a diameter of 7 mm and a sample dosage of 15 μl.

[0084] 1.2 Spot test substance and concentration

[0085] Sodium lauryl sulfate (SLS) is a classic skin irritation test substance. A 1% SLS aqueous solution is used as a positive control, and physiological saline or distilled water is used as a negative control.

[0086] 1.2 Subjects

[0087] A total of 30 healthy subjects were selected, including 15 females and 15 males, aged 20 to 48 years, with a mean age of (27.07±20.80) years. Subjects who had used glucocorticoids, nonsteroidal anti-inflammatory drugs, or antihistamines within the past 2 months were excluded. In addition, breastfeeding or pregnant women, those with skin diseases, sunburn, keloid scarring, excessive tattoos, or genetic allergies were also excluded. All subjects signed informed consent forms before the trial.

[0088] 2. Operating Method

[0089] 2.1 Spot Tester Operation Procedure

[0090] The flexor surface of the subject's upper arm was selected as the occlusive patch test site. The patch applicator was marked sequentially from top to bottom and left to right with a pencil. The coated paper on the patch applicator was removed, and the test sample solution (15 μL) was placed into the small aluminum chamber and spread evenly. The patch applicator, coated with the chemical reagent, was applied to the patient's skin, firmly and evenly from bottom to top, and gently pressed a few times with the palm to expel air. The patch applicator was removed after 24 hours. To avoid false impressions caused by pressure from the patch applicator, skin reactions were observed 30 minutes (after the pressure marks disappeared), 24 hours, and 48 hours after removal of the patch applicator, and the results were recorded.

[0091] 2.2 Results Evaluation Methods

[0092] Whether a test substance is an allergen is determined by the skin's reaction. A visual assessment is conducted on a scale of 0-4, with each score representing a different skin reaction. The meaning of each score for the skin reaction is as follows:

[0093] A score of 0 indicates a negative reaction (—), meaning it has no irritating effect on the skin;

[0094] A score of 1 indicates a suspicious reaction (±), with only slight erythema on the skin;

[0095] A score of 2 indicates a weak positive reaction (+, erythema reaction), with skin showing erythema, infiltration, edema, and possibly papules;

[0096] A score of 3 represents a strong positive reaction (++, herpes reaction), with the skin showing erythema, infiltration, edema, papules, and vesicles, and the reaction may extend beyond the test area;

[0097] A score of 4 represents an extremely strong positive reaction (+++, confluent herpes reaction), with obvious erythema, severe infiltration, edema, and confluent herpes on the skin, and the reaction extending beyond the test area.

[0098] 2.3 Spot test reagent samples

[0099] The sunscreen compositions based on the synergistic stabilization of sodium oleate and chondroitin sulfate prepared by the methods of Examples 1-7 were used as samples for patch testing, with three parallel samples set for each example.

[0100] 1% sodium dodecyl sulfate was used as a positive control.

[0101] Physiological saline or distilled water were used as negative controls.

[0102] 3. Experimental Results

[0103] The results of skin irritation tests on sunscreen compositions based on the synergistic stabilization of sodium oleate and chondroitin sulfate using a spot tester are shown in Table 5.

[0104] All subjects scored 4 points for the positive control and 0 points for the negative control.

[0105] Table 5: Skin irritation test results of sunscreen compositions based on the synergistic stabilization of sodium oleate and chondroitin sulfate

[0106] The results above show that Examples 1, 2, and 4 do not contain the sunscreen agent avobenzone (AVO) and all showed negative reactions, indicating no skin irritation. Even when applied directly to cosmetics at a 100% concentration, they exhibit good safety performance. Examples 3, 5, 6, and 7 contain higher concentrations of the traditional sunscreen agent avobenzone (AVO). A few subjects showed suspected positive reactions, with mild skin irritation and allergic reactions. These combinations require dilution when used in cosmetics, with a maximum concentration of 50%.

[0107] Test Example 3:

[0108] Evaluation of sun protection performance of sunscreen compositions based on the synergistic stabilization of sodium oleate and chondroitin sulfate.

[0109] The sunscreen emulsion final products of Examples 1-7 were prepared according to the following steps, and their SPF and UVA-PF values ​​were tested in vitro according to ISO 23675-2024.

[0110] An O / W emulsion system sunscreen emulsion is prepared, comprising the following components: 2% emulsifiers cetearyl alcohol and cetearyl glucoside, 5% oleic acid / capric acid triglyceride, 3% oleic acid polydimethylsiloxane, 2% glycerin, 0.05% EDTA-2Na, 0.5% phenoxyethanol, 30% sunscreen composition, and the balance deionized water.

[0111] The sunscreen composition based on the synergistic stabilization of sodium oleate and chondroitin sulfate, its preparation method, and its application, are used to prepare an O / W emulsion system sunscreen emulsion, comprising the following steps:

[0112] S1: Add the emulsifiers cetearyl alcohol and cetearyl glucoside to caprylic / capric triglyceride and polydimethylsiloxane, and dissolve and mix them evenly at 80°C to form the oil phase;

[0113] S2: Dissolve and mix glycerol, EDTA-2Na, and deionized water at 80°C until homogeneous to form the aqueous phase;

[0114] S3: Add the oil phase to the aqueous phase, homogenize 3 times, 1 minute each time, at a speed of 10000 rpm;

[0115] S4: Cool the material to below 45°C, add the composition described in Examples 1-7 and the preservative, and make up the balance with purified water, then discharge the material.

[0116] The results are shown in Table 6 below.

[0117] Table 6: Evaluation Results of Sunscreen Performance of Sunscreen Compositions Based on the Synergistic Stabilization of Sodium Oleate and Chondroitin Sulfate

[0118] The results above show that when Examples 1-7 are applied to the final cosmetic product at a concentration of 30%, the tested SPF and UVA-PF values ​​of the sunscreen are comparable to the calculated and simulated values, indicating that the prepared composition has good sun protection performance.

[0119] Test Example 4:

[0120] Skin feel evaluation of sunscreen compositions based on the synergistic stability of sodium oleate and chondroitin sulfate.

[0121] Example 4 was applied to the final sunscreen product according to the preparation method of Experiment 3, and skin feel tests were conducted compared with the control formula. Control formula 1 replaced dibutyl adipate (DBA) in the sunscreen composition with an equal amount of caprylic / capric triglyceride (GTCC); control formula 2 replaced neopentyl glycol didecanoate in the sunscreen composition with an equal amount of caprylic / capric triglyceride (GTCC); control formula 3 replaced C10-13 isoparaffin in the sunscreen composition with an equal amount of caprylic / capric triglyceride (GTCC); and control formula 4 replaced dibutyl adipate (DBA), neopentyl glycol didecanoate, and C10-13 isoparaffin in the sunscreen composition with an equal amount of caprylic / capric triglyceride (GTCC).

[0122] A total of 30 healthy subjects were selected, including 15 females and 15 males, aged 20 to 48 years, with a mean age of (27.07±20.80) years. Subjects who had used glucocorticoids, nonsteroidal anti-inflammatory drugs, or antihistamines within the past 2 months were excluded. In addition, breastfeeding or pregnant women, those with skin diseases, sunburn, keloid scarring, excessive tattoos, or genetic allergies were also excluded. All subjects signed informed consent forms before the trial.

[0123] like Figure 3 As shown in the skin feel test results, Example 4 exhibits the best performance in terms of skin feel, spreadability, absorption, fluidity, and non-stickiness. Comparative formulations 1 and 2, which do not contain dibutyl adipate (DBA) or neopentyl glycol didecanoate, are slightly inferior to Example 4 in these aspects, indicating that these two oils not only have good sunscreen dissolving properties but also offer a better, less greasy feel than traditional oils. Comparative formulation 3 does not contain volatile C10-13 isoparaffinic oils, while comparative formulation 4 does not contain dibutyl adipate (DBA), neopentyl glycol didecanoate, or volatile C10-13 isoparaffinic oils. Skin feel test results show that both are significantly inferior to Example 4 in terms of refreshing feel, spreadability, and non-stickiness, indicating that volatile C10-13 isoparaffinic oils have a significant effect on improving skin feel in the formulation.

[0124] Test Case Summary: The test cases show that the compositions of the present invention (Examples 1-7) are stable in high-temperature, variable-temperature, accelerated, and long-term stability tests, while the blank examples and comparative examples without sodium oleate, chondroitin sulfate, or specific oils all exhibited stratification. Skin patch tests showed good safety and low irritation. When formulated into sunscreens with a 30% addition, the in vitro SPF values ​​reached 21-32, and the UVA-PF values ​​reached 4-15, demonstrating excellent sun protection performance. Skin feel evaluation results showed that its refreshing feel, spreadability, and absorption were significantly better than the comparative formulations that replaced specific oils, confirming the key role of the oil system in improving skin feel.

[0125] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A sunscreen composition based on the synergistic stabilization of sodium oleate and chondroitin sulfate, characterized in that, It contains the following components by weight percentage: Sunscreen agents 20-40%; Emulsifier 6.5-10%, which includes sodium oleate; Oil content 21-35%; Thickener 0.01-3%, containing chondroitin sulfate or its salt; Moisturizer 1-8%; Preservative 0.1%; The remainder is water.

2. The sunscreen composition according to claim 1, characterized in that, The sunscreen agent includes a solid sunscreen agent and a liquid sunscreen agent. The solid sunscreen agent is selected from two of the following: bis-ethylhexyloxyphenol methoxyphenyl triazine, diethylamino hydroxybenzoyl hexyl benzoate, avobenzone, and diethylhexylbutamidotriazine ketone. The liquid sunscreen agent is selected from octocrylene and isooctyl p-methoxycinnamate. The weight ratio of the solid sunscreen agent to the liquid sunscreen agent is 1:1 to 2:

1.

3. The sunscreen composition according to claim 1, characterized in that, The emulsifier contains 1.5-3% sodium oleate and also contains 1-2% hydrogenated lecithin and 4-5% cetearyl alcohol polyether-20.

4. The sunscreen composition according to claim 1, characterized in that, The thickener contains 0.01-0.2% sodium chondroitin sulfate and also contains 0.01-0.1% sodium hyaluronate.

5. The sunscreen composition according to claim 1, characterized in that, The oil comprises 8-10% dibutyl adipate, 8-15% C10-13 isoparaffins, and 5-10% neopentyl glycol didecanoate.

6. The sunscreen composition according to claim 1, characterized in that, The humectant includes 0.5-2% propylene glycol and 0.5-3% pentanediol; the preservative is phenoxyethanol.

7. The method for preparing the sunscreen composition according to any one of claims 1-6, characterized in that, Includes the following steps: S1: Dissolve and mix solid sunscreen, liquid sunscreen, and oil at 80°C until homogeneous to form the oil phase; S2: Dissolve and mix the emulsifier, thickener, humectant, and water at 80°C until homogeneous to form the aqueous phase; S3: Add the oil phase to the aqueous phase for homogenization; S4: Cool the obtained material to below 45℃, add preservative, replenish the balance with water, and discharge the material.

8. The use of the sunscreen composition according to any one of claims 1-6 in cosmetics.

9. A sunscreen lotion comprising the sunscreen composition as described in any one of claims 1-6, characterized in that, By weight percentage, the sunscreen also contains: Emulsifiers: 2% total of cetearyl alcohol and cetearyl glucoside; Oils: Caprylic / Capric triglycerides 5%, Polydimethylsiloxane 3%; Glycerin 2%; EDTA-2Na 0.05%; Preservative 0.5%; The sunscreen composition is 20-30%; The remainder is water.

10. The method for preparing the sunscreen lotion as described in claim 9, characterized in that, Includes the following steps: S1: Add the emulsifiers cetearyl alcohol and cetearyl glucoside to caprylic / capric triglyceride and polydimethylsiloxane, and dissolve and mix them evenly at 80°C to form the oil phase; S2: Dissolve and mix glycerol, EDTA-2Na, and water at 80℃ until homogeneous to form the aqueous phase; S3: Add the oil phase to the aqueous phase for homogenization; S4: Cool the obtained material to below 45°C, add the sunscreen composition and preservative as described in claims 1-6, add water to make up the balance, and discharge the material.

Images