A sunscreen synergistic composition, a preparation method, application and cosmetic product thereof

Abstract

The application belongs to the field of cosmetics, and discloses a preparation method of a sunscreen synergistic composition, and specifically comprises the following steps: step 1: dissolving isostearic acid in a first solvent, adding polymethyl methacrylate into the first solvent, and performing ultrasonic or homogenization dispersion to obtain a mixture; step 2: performing solvent removal treatment on the mixture obtained in step 1; step 3: dissolving trimethylsiloxy silicate in a second solvent, adding the product obtained in step 2 into the second solvent, and uniformly mixing to obtain the sunscreen synergistic composition; the mass ratio of polymethyl methacrylate, isostearic acid and trimethylsiloxy silicate is 1:0.1-0.3:0.2-0.9. The sunscreen synergistic composition prepared by the preparation method can make the components of the sunscreen synergistic composition better compatible, make the skin feel of the sunscreen synergistic composition more silky, and make the polymethyl methacrylate more firm, not easy to migrate or fall off, which is beneficial to improving the sunscreen effect of the product.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cosmetics, and discloses a sunscreen synergistic composition, a preparation method, application and cosmetic thereof. BACKGROUND

[0002] With the deepening of people's awareness of the harm of ultraviolet rays, the importance of sunscreen products in daily life is increasingly prominent. Ultraviolet (UV) radiation includes UVA (wavelength 320-400 nm) and UVB (wavelength 280-320 nm), and appropriate ultraviolet radiation is beneficial to the health of the human body, but long-term exposure to ultraviolet rays can cause skin sunburn, tanning, photoaging, and even increase the risk of skin cancer.

[0003] Existing sunscreen products mainly achieve sunscreen effect through chemical sunscreen agents, physical sunscreen agents or a combination of the two; however, the skin feel of most sunscreen products cannot meet people's needs, especially for sensitive skin groups; therefore, in order to improve the skin feel, the industry attempts to add polymethyl methacrylate powder (PMMA powder) to sunscreen products. Regarding the safety of PMMA in cosmetics: the safety of PMMA is supported by the safety evaluation file of CIR (Cosmetic Ingredient Review), and the CIR safety evaluation results show that when the formula is non-irritating (verified by patch test), the use concentration of the ingredient in the resident product is not more than 44.6%, and the use concentration of the elution type is not more than 15.6%, which is safe. CIR, also known as Cosmetic Ingredient Review Panel, was founded by the Cosmetic, Toiletry and Fragrance Association (now the Personal Care Products Council, PCPC) in 1976, and is responsible for the risk assessment of cosmetic raw materials. The review process of CIR on the safety of cosmetic raw materials is independent of the board of directors and the cosmetic industry. PMMA powder has a delicate texture and can impart a more lightweight and smooth application feel to sunscreen products, effectively improving the shortcomings of traditional sunscreen products such as thick texture; however, PMMA powder has the problem of easy falling off. In daily activities, slight friction, wind blowing and other conditions can cause PMMA powder attached to the skin surface to fall off, and the effect of improving skin feel cannot be sustained. More importantly, the falling of PMMA powder can seriously affect the sunscreen effect. When the PMMA powder falls off, the sunscreen agent coating originally evenly distributed on the skin surface has gaps, on the one hand, the chemical sunscreen agent may lose part of the carrier due to the falling of PMMA powder, and cannot be evenly spread on the skin surface, thereby reducing the absorption efficiency of ultraviolet rays; on the other hand, physical sunscreen agents such as titanium dioxide and zinc oxide particles may not maintain a stable dispersion state due to the absence of PMMA powder, and easily aggregate, resulting in a significant reduction in the reflection and scattering effect of ultraviolet rays.

[0004] Based on this, the technical problem to be solved by the present application is how to prepare a sunscreen synergistic composition that can continuously maintain a silky skin feel while improving sunscreen effect. SUMMARY

[0005] The present application aims to provide a preparation method of a sunscreen synergistic composition, which is specifically characterized in that:

[0006] Step 1: Dissolve isostearic acid in a first solvent, then add polymethyl methacrylate into the first solvent, and perform ultrasonic or homogenization dispersion to obtain a mixture; Step 2: Perform solvent removal treatment on the mixture obtained in Step 1; Step 3: Dissolve trimethylsiloxy silicate in a second solvent, then add the product obtained in Step 2 into the second solvent, and mix uniformly to obtain the sunscreen synergistic composition.

[0007] Meanwhile, the present application also provides the sunscreen synergistic composition obtained by the preparation method, and the use and cosmetic of the sunscreen synergistic composition.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0009] A preparation method of a sunscreen synergistic composition, which is characterized in that:

[0010] Step 1: Dissolve isostearic acid in a first solvent, then add polymethyl methacrylate into the first solvent, and perform ultrasonic or homogenization dispersion to obtain a mixture;

[0011] Step 2: Perform solvent removal treatment on the mixture obtained in Step 1;

[0012] Step 3: Dissolve trimethylsiloxy silicate in a second solvent, then add the product obtained in Step 2 into the second solvent, and mix uniformly to obtain the sunscreen synergistic composition.

[0013] The mass ratio of the polymethyl methacrylate, isostearic acid and trimethylsiloxy silicate is 1:0.1-0.3:0.2-0.9.

[0014] In some prior art, in order to overcome the low adhesion of polymethyl methacrylate on the skin, easy to migrate, generally will use film forming agent, such as trimethyl siloxy silicate, to reduce the migration characteristics of polymethyl methacrylate. But such processing mode will greatly reduce the skin feel improvement performance of polymethyl methacrylate after the sunscreen product is formed on the skin; and the film material trimethyl siloxy silicate is a low polarity polymer with a large number of crosslinked siloxane bonds, which makes the film material trimethyl siloxy silicate have poor affinity for polymethyl methacrylate and chemical sunscreen agent which is mainly based on carbon-carbon bond or has high polarity, so the ordinary mixing method may leave more optical hollow parts for polymethyl methacrylate and film material trimethyl siloxy silicate in the ordinary sunscreen product, thereby reducing the protection performance of the sunscreen product.

[0015] In the present application, isostearic acid and polymethyl methacrylate are mixed and ultrasonic or homogenously dispersed in advance, and then mixed with a film forming agent, which has better sunscreen synergistic performance than the product obtained by directly mixing the three; based on this phenomenon, it is speculated that the pre-ultrasonic or homogenously dispersion is beneficial to the isostearic acid entering the pores of the polymethyl methacrylate, and increases the affinity of the film material and the polymethyl methacrylate, or increases the affinity of the mixture and the sunscreen agent, thereby overcoming the problem of reduced light protection performance caused by optical hollow.

[0016] Meanwhile, the present application also verifies that other substances prepared by the pre-mixing and ultrasonic or homogenously dispersion method of the present application do not have the effect of isostearic acid used in the present application, and the possible reason is that the affinity between other substances such as hydrogenated polyisobutylene, PEG-10 dimethicone and polymethyl methacrylate is different; among them, each repeating unit in the molecular chain of polymethyl methacrylate contains an ester group (-COO-), and the carbonyl group (C=O) and ether oxygen atom form a dipole moment due to the difference in electronegativity, resulting in a local polarity of the molecular chain; hydrogenated polyisobutylene, PEG-10 dimethicone and isostearic acid are in order of hydrogenated polyisobutylene, PEG-10 dimethicone and isostearic acid according to the polarity from weak to strong; therefore, we speculate that the difference in the results is caused by the difference in the affinity based on the difference in the polarity, and then reduces the optical hollow effect in the sunscreen process.

[0017] Preferably, the first solvent is one or more combinations of ethanol, volatile alkane oil, and volatile dimethicone.

[0018] The second solvent is one or more combinations of volatile alkane oil and volatile dimethicone.

[0019] More preferably, the weight ratio of isostearic acid to the first solvent is 1:10.

[0020] The weight ratio of the trimethylsiloxy silicate and the second solvent is 1:2.

[0021] Preferably, the reaction of step 1 and step 3 are both carried out at room temperature.

[0022] In step 2, the solvent removal treatment is carried out by heating or vacuum drying.

[0023] In addition, the present application also discloses a sunscreen synergistic composition prepared by the above method.

[0024] In addition, the present application discloses the use of the sunscreen synergistic composition prepared by the above method for preparing a cosmetic.

[0025] Preferably, the cosmetic is a sunscreen cosmetic.

[0026] Finally, the present application also discloses a cosmetic containing 0.5wt%-10wt% of the sunscreen synergistic composition of claim 5.

[0027] Preferably, the cosmetic includes sunscreen cream, sunscreen milk, sunscreen stick, sunscreen gel, sunscreen jelly, sunscreen oil, and sunscreen foundation.

[0028] Compared with the prior art, the present application has the following beneficial effects:

[0029] The sunscreen synergistic composition prepared by the preparation method of the present application has a more silky skin feel, and the polymethyl methacrylate is more firm, not easy to migrate or fall off, which is beneficial to improve the sunscreen effect of the product. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 Figure is the SPF value test chart of the untreated sunscreen milk of application example 1;

[0031] Figure 2 Figure is the SPF value test chart of the treated sunscreen milk of application example 1;

[0032] Figure 3 Figure is the SPF value test chart of the untreated sunscreen milk of application example 2;

[0033] Figure 4 Figure is the SPF value test chart of the treated sunscreen milk of application example 2;

[0034] Figure 5 Figure is the SPF value test chart of the untreated sunscreen milk of application example 3;

[0035] Figure 6 Figure is the SPF value test chart of the treated sunscreen milk of application example 3;

[0036] Figure 7 Figure for unprocessed SPF value test of sunscreen lotion of Application Example 4;

[0037] Figure 8 Figure for processed SPF value test of sunscreen lotion of Application Example 4;

[0038] Figure 9 Figure for unprocessed SPF value test of sunscreen lotion of Application Example 5;

[0039] Figure 10 Figure for processed SPF value test of sunscreen lotion of Application Example 5;

[0040] Figure 11 Figure for unprocessed SPF value test of sunscreen lotion of Application Example 6;

[0041] Figure 12 Figure for processed SPF value test of sunscreen lotion of Application Example 6;

[0042] Figure 13 Figure for unprocessed SPF value test of sunscreen lotion of Application Example 7;

[0043] Figure 14 Figure for processed SPF value test of sunscreen lotion of Application Example 7;

[0044] Figure 15 Figure for unprocessed SPF value test of sunscreen lotion of Application Example 8;

[0045] Figure 16 Figure for processed SPF value test of sunscreen lotion of Application Example 8;

[0046] Figure 17 Figure for unprocessed SPF value test of sunscreen lotion of Application Example 9;

[0047] Figure 18 Figure for processed SPF value test of sunscreen lotion of Application Example 9;

[0048] Figure 19 Figure for unprocessed SPF value test of sunscreen lotion of Application Example 10;

[0049] Figure 20 Figure for processed SPF value test of sunscreen lotion of Application Example 10;

[0050] Figure 21 Figure for unprocessed SPF value test of sunscreen lotion of Application Example 11;

[0051] Figure 22 Figure for processed SPF value test of sunscreen lotion of Application Example 11;

[0052] Figure 23Figure for testing the unprocessed SPF value of the sunscreen cream of Example 12;

[0053] Figure 24 Figure for testing the processed SPF value of the sunscreen cream of Example 12;

[0054] Figure 25 Figure for testing the unprocessed SPF value of the sunscreen cream of Example 13;

[0055] Figure 26 Figure for testing the processed SPF value of the sunscreen cream of Example 13;

[0056] Figure 27 Figure for testing the unprocessed SPF value of the sunscreen cream of Example 14;

[0057] Figure 28 Figure for testing the processed SPF value of the sunscreen cream of Example 14;

[0058] Figure 29 Figure for testing the unprocessed SPF value of the sunscreen cream of Example 15;

[0059] Figure 30 Figure for testing the processed SPF value of the sunscreen cream of Example 15. DETAILED DESCRIPTION

[0060] The technical solutions of the present application will be described clearly and completely below in combination with the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0061] Product information:

[0062] Polymethyl methacrylate: particle size 3-30 μm, preferably 5-7 μm; oil absorption 0.1-2 g / g, preferably 0.1-0.5 g / g, available product name SUNPMMA-S of SUNJIN BEAUTY SCIENCE Co., Ltd;

[0063] Isostearic acid: RADIACID 0909 or RADIACID 0908 of Belgium OLEON Co., Ltd;

[0064] Trimethylsiloxy silicate: SF-1002 methyl MQ silicone resin of Guangdong Baimi Silicon Fluorine New Material Co., Ltd;

[0065] Polydimethylsiloxane: MIRASIL DM 1.5 of Jiangxi Lansheng Xinghuo Organic Silicon Co., Ltd;

[0066] Hydrogenated polyisobutylene: POLYSYNLANE 3 from NOF Corporation;

[0067] PEG-10 dimethicone: KF-6017 from Shin-Etsu Chemical Co., Ltd.

[0068] First part sample preparation

[0069] The formula of the sunscreen synergistic composition of each example is shown in Table 1; the specific preparation steps of the composition of Examples 1-3 are as follows:

[0070] Step 1: Dissolve isostearic acid in anhydrous ethanol, mix with polymethyl methacrylate, and ultrasonic dispersion, ultrasonic power is 40KHz / 100W, time is 20min, to get the mixture; the mass ratio of isostearic acid to anhydrous ethanol is 1:10.

[0071] Step 2: Vacuum drying the above mixture to remove the solvent.

[0072] Step 3: Dissolve trimethylsiloxy silicate in dissolved polydimethylsiloxane, mix with the product of step 2, and get the sunscreen synergistic composition after uniform mixing; the mass ratio of trimethylsiloxy silicate to polydimethylsiloxane is 1:2.

[0073] Table 1 composition formula table (mass parts)

[0074] Isostearic acid Polymethyl methacrylate Trimethylsiloxy silicate Example 1 0.2 1 0.6 Example 2 0.1 1 0.9 Example 3 0.3 1 0.2

[0075] Comparative Example 1

[0076] Generally the same as Example 1, the difference is that isostearic acid, polymethyl methacrylate, trimethylsiloxy silicate are mixed directly in the use formula with other raw materials.

[0077] Comparative Example 2

[0078] Generally the same as Example 1, the difference is that isostearic acid is not added in the formula, and polymethyl methacrylate, trimethylsiloxy silicate are directly mixed in the use formula with other raw materials.

[0079] Comparative Example 3

[0080] Step 1: Dissolve PEG-10 dimethicone in anhydrous ethanol, mix with polymethyl methacrylate, and ultrasonic dispersion, ultrasonic power is 40KHz / 100W, time is 20min, to get the mixture; the mass ratio of PEG-10 dimethicone to anhydrous ethanol is 1:10.

[0081] Step 2: Vacuum drying the above mixture to remove the solvent.

[0082] Step 3: Dissolve trimethylsiloxysilicate in dissolved polydimethylsiloxane, mix with the product from Step 2, and after uniform mixing, obtain the sunscreen synergistic composition; the mass ratio of trimethylsiloxysilicate to polydimethylsiloxane is 1:2.

[0083] Comparative Example 4

[0084] It is largely the same as Comparative Example 3, except that PEG-10 polydimethylsiloxane, polymethyl methacrylate, and trimethylsiloxysilicate are mixed directly with other raw materials in the formulation used.

[0085] Comparative Example 5

[0086] Step 1: Dissolve hydrogenated polyisobutylene in anhydrous ethanol, mix with polymethyl methacrylate, and then ultrasonically disperse using an ultrasonic power of 40 kHz / 100 W for 20 min to obtain a mixture; the mass ratio of hydrogenated polyisobutylene to anhydrous ethanol is 1:10.

[0087] Step 2: Vacuum dry the mixture to remove the solvent.

[0088] Step 3: Dissolve trimethylsiloxysilicate in dissolved polydimethylsiloxane, and mix with the solution from Step 2. After mixing evenly, the sunscreen-enhancing composition is obtained. The mass ratio of trimethylsiloxysilicate to polydimethylsiloxane is 1:2.

[0089] Comparative Example 6

[0090] It is largely the same as Comparative Example 5, except that hydrogenated polyisobutylene, polymethyl methacrylate, and trimethylsiloxysilicate are mixed directly with other raw materials in the formulation used.

[0091] Application Examples 1-9

[0092] The sunscreen synergistic compositions obtained from each example and comparative example were made into sunscreen lotions, and the formulations of the sunscreen lotions are shown in Table 2; wherein, the sunscreen lotions of Examples 1-3 are Application Examples 1-3, and the sunscreen lotions of Comparative Examples 1-6 are Application Examples 4-9.

[0093] The preparation method is as follows:

[0094] Step 1: Mix the oil phase components and heat to above 80°C to ensure complete dissolution of all components;

[0095] Step 2: Add the sunscreen synergist composition and homogenize for 3 minutes to obtain a homogeneous and complete oil phase;

[0096] Step 3: Slowly add the evenly dissolved aqueous phase, then homogenize for 3 minutes to obtain a semi-finished sunscreen lotion.

[0097] Table 2 Sunscreen cream formulation table

[0098]

[0099] Application Example 10

[0100] The same as Application Example 1, except that the content of the sunscreen booster composition is 0.5wt%.

[0101] Application Example 11

[0102] The same as Application Example 1, except that the content of the sunscreen booster composition is 10wt%.

[0103] Application Example 12

[0104] The formulation is shown in Table 3:

[0105] Table 3 Formulation table of Application Example 12

[0106]

[0107] Application Example 13

[0108] The formulation is shown in Table 4:

[0109] Table 4 Formulation table of Application Example 13

[0110]

[0111] Application Example 14

[0112] The same as Application Example 12, except that the mixing method of isostearic acid, polymethyl methacrylate and trimethylsiloxy silicate is directly mixed with other raw materials in the use formulation.

[0113] Application Example 15

[0114] The same as Application Example 13, except that the mixing method of isostearic acid, polymethyl methacrylate and trimethylsiloxy silicate is directly mixed with other raw materials in the use formulation.

[0115] Performance test

[0116] The sunscreen cream prepared in each application example is tested according to the following method;

[0117] (1) Patch test

[0118] The prepared sunscreen cream is subjected to skin occlusive patch test according to the "human skin patch test" in the "Cosmetic Safety Technology Specification (2015 Edition)".

[0119] (2) Sensory test

[0120] 30 users were recruited to evaluate the feel, and were given standard samples with evaluated silk skin feel scores, then the users were asked to evaluate the actual sunscreen cream samples for silk skin feel (1-5 points), and the average score was obtained to get the feel score;

[0121] (3) Sunscreen performance

[0122] According to the ISO 24443:2021 in vitro sunscreen test method, after 0.75 mg / cm 2 of the sample was applied to the PMMA plate meeting the standard requirements, the SPF value (sun protection factor) of the corresponding sample was tested using the UV-2000S of Labsphere.

[0123] (4) Durability

[0124] On the same PMMA plate for testing sunscreen performance as described above, the same size cosmetic cotton was used, and a 50g weight was applied to the cosmetic cotton to ensure consistent pressure, then the cosmetic cotton was pulled according to a constant time of 2 seconds to apply external force to the sample on the PMMA plate, and after 15 minutes, the SPF value was tested using the UV-2000S of Labsphere, the sunscreen values before and after treatment were compared and the SPF value durability was calculated, durability = (SPF value after treatment / SPF value) * 100%.

[0125] The test data is shown in Table 5;

[0126] Table 5 Test data table

[0127]

[0128]

[0129] Conclusion analysis

[0130] The patch test results show that the sunscreen cream involved in the present application has no adverse reactions, and the patch test of Comparative Example 1 also has no adverse reactions.

[0131] Application Examples 1-3 are all high in use feeling score, while Application Examples 4-9, especially Application Example 5 without the addition of isostearic acid, are lower in use feeling score, indicating that the treatment of pre-mixing isostearic acid with PMMA powder can improve the use feeling of PMMA powder to some extent. The sunscreen value durability of Application Examples 1-3 (Examples 1-3) and Application Examples 10-13 is greater than 50%, which can be considered to have certain durability, while the sunscreen value durability of Application Examples 4-9 (Comparative Examples 1-6) and Application Examples 14-15 is less than 50%, which can be considered to have poor durability. It can be seen that, in the technical solution of the present application, the sunscreen synergistic composition prepared by the preparation method of the present application can make the components better compatible, and can further increase the sunscreen durability and improve the sunscreen effect.

[0132] The initial sunscreen value and durability of Application Example 1 (Example 1) are higher than those of Application Example 4 (Comparative Example 1), indicating that the pre-mixing of isostearic acid and polymethyl methacrylate in the present application makes the sunscreen synergistic composition more compatible in the formula, and the sunscreen lotion spreads more evenly without voids, thus having higher sunscreen ability and durability.

[0133] The initial value of Application Example 1 (Example 1) is higher than that of Application Example 5 (Comparative Example 2), and the initial value of Application Example 1 (Example 1) is higher than that of Application Example 4 (Comparative Example 1), indicating that isostearic acid is necessary in the composition, and the process of the composition further improves the effect of isostearic acid.

[0134] Application Examples 6-7 (Comparative Examples 3-4) use PEG-10 dimethicone, a common polar ingredient in sunscreen lotion formula, instead of isostearic acid in the composition. Application Example 6 uses the preparation process of the present application, and Application Example 7 uses a simple blending process. From the use feeling score, it can be seen that the use of other polar ingredients cannot provide the use feeling improvement brought by isostearic acid. On the other hand, PEG-10 dimethicone is a macromolecular structure, which cannot improve the compatibility between the film material, PMMA powder and sunscreen ingredients, and thus does not have a significant effect on improving the sunscreen value and sunscreen value durability of sunscreen lotion products.

[0135] Application Examples 8-9 (Comparative Examples 5-6) are common non-polar ingredients in sunscreen cream formulations, hydrogenated polyisobutylene is used instead of isostearic acid in the composition, among which Application Example 8 uses the preparation process of the present application, and Application Example 9 uses a simple blending process. From the use feeling score, it can be seen that using other non-polar ingredients cannot provide the use feeling improvement brought by isostearic acid; on the other hand, because the polarity of hydrogenated polyisobutylene is low, it also cannot improve the compatibility between the film material, PMMA powder and sunscreen ingredients, so it does not play a significant role in improving the sunscreen value and sunscreen value durability of sunscreen cream products.

[0136] Application Examples 10-11 are sunscreen creams with different composition contents, and the use feeling score changes with the amount of composition used, the more composition used, the higher the use feeling score, within the composition amount range of the present application, both have good sunscreen durability and sunscreen effect.

[0137] Application Example 12 is a sunscreen cream formula containing only physical sunscreen agents, and Comparative Application Example 14 also has an improvement effect;

[0138] Application Example 13 is a sunscreen cream formula containing only chemical sunscreen agents, and Comparative Application Example 15 also has an improvement effect.

[0139] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

Claims

1. A method for preparing a sunscreen-enhancing composition, characterized in that, The method is specifically as follows: Step 1: Dissolve isostearic acid in the first solvent, then add polymethyl methacrylate to the first solvent and disperse it by ultrasonication or homogenization to obtain a mixture; Step 2: Remove the solvent from the mixture obtained in Step 1; Step 3: Dissolve trimethylsiloxysilicate in the second solvent, then add the product obtained in step 2 to the second solvent, mix well to obtain the sunscreen synergistic composition; The mass ratio of polymethyl methacrylate, isostearic acid, and trimethylsiloxysilicate is 1:0.1-0.3:0.2-0.

9.

2. The preparation method according to claim 1, characterized in that, The first solvent is one or a combination of ethanol, volatile alkane oils, and volatile polydimethylsiloxane; The second solvent is one or more combinations of volatile alkane oils and volatile polydimethylsiloxanes.

3. The preparation method according to claim 2, characterized in that, The weight ratio of isostearic acid to the first solvent is 1:10; The weight ratio of the trimethylsiloxysilicate to the second solvent is 1:

2.

4. The preparation method according to claim 1, characterized in that, The reactions in steps 1 and 3 are both carried out at room temperature. In step 2, solvent removal is performed by heating or vacuum drying.

5. A sunscreen-enhancing composition, characterized in that, It is prepared by the method described in any one of claims 1 to 4.

6. Use of the sunscreen synergistic composition as described in claim 5 in the preparation of cosmetics.

7. The use according to claim 6, characterized in that, The cosmetic mentioned is a sunscreen.

8. A cosmetic product, characterized in that, The cosmetic contains 0.5wt%-10wt% of the sunscreen synergistic composition as described in claim 5.

9. The cosmetic product according to claim 8, characterized in that, The cosmetics include sunscreen, sunscreen lotion, sunscreen stick, sunscreen gel, sunscreen oil, and sunscreen base makeup.

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