Sunscreen cream and preparation method thereof

Abstract

The invention relates to the technical field of sunscreen cream preparation, in particular to sunscreen cream and a preparation method thereof. The sunscreen cream comprises a chemical sunscreen agent, a physical sunscreen agent, an emulsifier, an emollient, an oil control agent, glycerin, propylene glycol, a ginkgo leaf extract, a cucumber extract, an aloe extract, a hamamelis virginiana extract, essence, a preservative and water. The formula of the sunscreen cream is optimized, and the ginkgo leaf extract, the cucumber extract, the aloe extract and the hamamelis virginiana extract are added into the sunscreen cream, so that the sunscreen effect of the sunscreen cream is synergistically improved, the sunscreen cream is ensured to have a good sunscreen effect, irritation and burden of the sunscreen agent to skin are reduced, and the sunscreen cream has a good application prospect. The whole health condition of the skin can be improved, and the skin problems possibly caused by using the sunscreen cream are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of sunscreen preparation, in particular to a sunscreen and a preparation method thereof. Background Art

[0002] With the improvement of people's living standards and the enhancement of health awareness, the market demand for sunscreen, as an effective skin protection product, is growing. Sunscreen can not only effectively prevent ultraviolet damage to the skin, but also delay skin aging and reduce the risk of skin cancer.

[0003] Traditional sunscreens usually use physical sunscreens, such as titanium dioxide, zinc oxide, etc., or chemical sunscreens, such as avobenzone, oxybenzone, etc., or a combination of the two. Although physical sunscreens are relatively safe, they are easy to burden the skin due to their large particles, resulting in uneven application and pale skin color. Relatively speaking, although chemical sunscreens are light and easy to apply, they may cause irritation reactions at high doses, and long-term use may also cause skin sensitivity and other adverse reactions. In order to achieve the ideal outdoor sun protection effect and ensure adequate sun protection, existing sunscreens often rely on increasing the amount of sunscreen used. However, the increase in the amount of sunscreen used may lead to a corresponding increase in the risk of irritation and allergies of the product, resulting in a heavier burden on the skin.

[0004] Therefore, it is necessary to further optimize the formula of sunscreen to reduce the irritation and burden of sunscreen on the skin while ensuring the sun protection effect. Summary of the invention

[0005] In order to ensure the sunscreen effect while reducing the irritation and burden of sunscreen on the skin, the present application provides a sunscreen and a preparation method thereof. The present application optimizes the formula of the sunscreen and synergistically improves the sunscreen effect of the sunscreen by adding ginkgo leaf extract, cucumber extract, aloe extract and witch hazel extract to the sunscreen. At the same time, these four plant extracts have additional effects of soothing and moisturizing. While ensuring that the sunscreen has a good sunscreen effect, it reduces the irritation and burden of the sunscreen on the skin, improves the overall health of the skin, and reduces skin problems that may be caused by the use of sunscreen.

[0006] In the first aspect, the sunscreen provided by the present application adopts the following technical solution: A sunscreen cream comprises the following raw materials in percentage by mass: 6% to 10% of a chemical sunscreen, 4% to 8% of a physical sunscreen, 2.1% to 2.6% of an emulsifier, 20% to 27% of a moisturizer, 1.1% to 1.3% of an oil-controlling agent, 10% to 12% of glycerol, 2.1% to 2.3% of propylene glycol, 0.9% to 1.4% of a ginkgo leaf extract, 0.5% to 1% of a cucumber extract, 1% to 1.5% of an aloe extract, 0.6% to 1.2% of a witch hazel extract, 0.1% to 0.5% of an essence, 0.5% to 1% of a preservative, and the balance is water.

[0007] In the above technical solution, ginkgo leaf extract is a natural plant extract extracted from ginkgo leaves. It is rich in active ingredients such as flavonoids and terpenoid lactones, has good antioxidant effects, can effectively neutralize free radicals, and slow down the skin aging process; at the same time, it can also improve skin blood circulation, promote the delivery of nutrients, enhance cell metabolic activity, help reduce skin dullness, and make the skin brighter and more lustrous; in addition, the ingredients in ginkgo leaf extract have a certain ability to absorb ultraviolet rays, providing additional light protection for the skin.

[0008] Cucumber extract is rich in vitamins C, E, potassium, magnesium and other minerals. These ingredients give cucumber extract excellent hydrating and moisturizing properties. It can quickly replenish the moisture needed by the skin and keep the skin hydrated and smooth. At the same time, cucumber extract also has certain calming and soothing properties, which can help relieve skin discomfort caused by external stimuli, such as redness, swelling, heat and pain after sun exposure. In addition, the refreshing properties of cucumber extract also help control facial oil secretion, prevent pores from clogging, and can nourish the skin well, making the skin smoother and softer.

[0009] Aloe vera extract contains a large amount of polysaccharides, amino acids, enzymes and other biologically active substances, which give it good anti-inflammatory and calming, moisturizing, wound repair, anti-aging and cleansing and detoxification effects; at the same time, aloe vera extract also has a good moisturizing effect, can lock in the skin's moisture, and increase the moisture content of the stratum corneum, thereby keeping the skin soft and hydrated.

[0010] Witch hazel extract is rich in tannic acid and other phenolic compounds, which give it good astringent, anti-inflammatory, soothing and other effects, and can help shrink pores, control oil secretion, and improve skin problems. At the same time, witch hazel extract can significantly reduce the content of malondialdehyde produced by strong ultraviolet radiation in tissues, reduce free radical damage caused by ultraviolet radiation, and help resist damage caused by the daily environment.

[0011] The present application compounds four plant extracts, namely, ginkgo leaf extract, cucumber extract, aloe extract and witch hazel extract, and combines the antioxidant and photoprotective effects of ginkgo leaf extract with the moisturizing effect of cucumber extract, the deep repair and long-lasting moisturizing of aloe extract, and the anti-inflammatory, astringent and auxiliary sunscreen functions of witch hazel extract. Through the synergistic effect of these four plant extracts, the components are complemented and enhanced. The components are strengthened from the aspects of enhancing the natural barrier function of the skin, extending the effective protection time of chemical sunscreens, reducing the generation of ROS in the skin, and alleviating skin discomfort. These components act together on the skin surface, thereby achieving an unexpected synergistic sunscreen effect. While reducing the amount of sunscreen used, the sunscreen effect of sunscreen is improved and the health of the skin is enhanced.

[0012] Preferably, the chemical sunscreen consists of ethylhexyl methoxycinnamate and benzophenone-3, and in terms of mass percentage of the sunscreen, comprises 5% to 7% of ethylhexyl methoxycinnamate and 1% to 3% of benzophenone-3.

[0013] In the above technical solution, ethylhexyl methoxycinnamate has good ultraviolet absorption ability, especially in the UVB region, while benzophenone-3 has a good absorption effect in the UVA region. By selecting two chemical sunscreens, ethylhexyl methoxycinnamate and benzophenone-3, not only the sunscreen band is expanded, but also the protection ability of sunscreen against ultraviolet rays of different wavelengths is enhanced. In addition, ethylhexyl methoxycinnamate and benzophenone-3 can work well with four plant extracts, namely, ginkgo leaf extract, cucumber extract, aloe extract and witch hazel extract, thereby further improving the sunscreen effect of sunscreen.

[0014] Preferably, the physical sunscreen is composed of silicon-treated titanium dioxide and zinc oxide, and in terms of mass percentage of the sunscreen, comprises 2% to 4% silicon-treated titanium dioxide and 2% to 4% zinc oxide.

[0015] In the above technical solution, the silicon-treated titanium dioxide particles are specially treated to make their surface smoother, reduce irritation to the skin, and improve the application feeling and transparency of the sunscreen. Zinc oxide, with its natural sunscreen properties, provides an additional protective layer for the sunscreen, further enhancing the sunscreen effect. By combining the two physical sunscreens, silicon-treated titanium dioxide and zinc oxide, with the two chemical sunscreens, ethylhexyl methoxycinnamate and benzophenone-3, and with the sunscreen synergistic effect of the four plant extracts, ginkgo leaf extract, cucumber extract, aloe extract and witch hazel extract, the sunscreen of the present application can provide more comprehensive and stable sunscreen protection.

[0016] Preferably, the emulsifier includes cetyl polyethylene glycol, sorbitan sesquioleate, PEG-10 polydimethylsiloxane and PEG-30 dipolyhydroxystearate.

[0017] In the above technical scheme, the present application can provide a good emulsification effect and ensure the stability and uniformity of the sunscreen by adopting an emulsifier combination of cetyl polyethylene glycol, sorbitan sesquioleate, PEG-10 polydimethylsiloxane and PEG-30 dipolyhydroxystearate.

[0018] Preferably, the emollient includes isopropyl myristate, dicaprylyl carbonate and ethylhexyl palmitate.

[0019] In the above technical scheme, by selecting isopropyl myristate, dicaprylyl carbonate and ethylhexyl palmitate as emollients, isopropyl myristate, dicaprylyl carbonate and ethylhexyl palmitate can not only provide moisturizing effect and improve the softness and smoothness of the skin, but also help the absorption of sunscreen, so that the sunscreen forms a protective film on the skin surface, effectively isolates ultraviolet rays, and further enhances the sun protection effect of the sunscreen.

[0020] Preferably, the oil control agent is magnesium sulfate heptahydrate.

[0021] In the above technical solution, the present application selects magnesium sulfate heptahydrate as an oil control agent, which can effectively absorb excess oil on the skin surface, reduce oiliness, and make the sunscreen feel more refreshing. At the same time, the addition of magnesium sulfate heptahydrate also helps to improve the fit of physical sunscreens on the face and improve the durability of sunscreens.

[0022] Preferably, the mass ratio of the ginkgo leaf extract, cucumber extract, aloe vera extract and witch hazel extract is 1.2:0.8:1.2:0.9.

[0023] In the above technical scheme, the present application can further enhance the synergistic effect among the ingredients by further optimizing the mass ratio of ginkgo leaf extract, cucumber extract, aloe vera extract and witch hazel extract, thereby ensuring that the antioxidant and photoprotective effects of ginkgo leaf extract, the hydrating and calming properties of cucumber extract, the deep repairing and moisturizing ability of aloe vera extract, and the astringent and anti-inflammatory effects of witch hazel extract are fully utilized, thereby significantly improving the overall performance of the sunscreen while reducing the amount of sunscreen used.

[0024] In a second aspect, the present application provides a method for preparing a sunscreen using the following technical solution: A method for preparing a sunscreen, comprising the following steps: Step 1: Take an emulsifier and a moisturizer, mix them evenly, then add a chemical sunscreen and a physical sunscreen, and heat them to 80-85° C. while stirring to obtain material 1, which is kept warm for later use; take water, an oil control agent, glycerin and propylene glycol, mix them, and heat them to 80-85° C. while stirring to obtain material 2, which is kept warm for later use; Step 2: At 80-85°C, slowly pump material 2 into material 1. After the pumping is completed, homogenize for 5-10 minutes, then keep warm and stir for 5-10 minutes, and evacuate to obtain material 3; Step 3: Cool material 3 to below 40° C., add the remaining raw materials, and stir evenly to obtain the sunscreen.

[0025] In the above technical scheme, the present application ensures the stability of the sunscreen system by separately mixing the oil phase raw materials and the water phase raw materials and controlling the addition temperature and addition steps of each raw material, so that the prepared sunscreen has a delicate texture and better sun protection effect.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. This application achieves an unexpected synergistic sunscreen effect through the synergistic effect of four plant extracts, namely, ginkgo leaf extract, cucumber extract, aloe extract and North American witch hazel extract. While reducing the amount of sunscreen used, it improves the sunscreen effect of sunscreen and enhances the health of the skin.

[0027] 2. This application selects two chemical sunscreens, ethylhexyl methoxycinnamate and benzophenone-3, which not only enhances the sunscreen's ability to protect against ultraviolet rays of different wavelengths, but also works well with four plant extracts, namely, ginkgo leaf extract, cucumber extract, aloe extract and witch hazel extract, thereby further enhancing the sunscreen effect of the sunscreen.

[0028] 3. The present application further enhances the sunscreen effect of sunscreen by combining two physical sunscreens, silicon-treated titanium dioxide and zinc oxide, with two chemical sunscreens, ethylhexyl methoxycinnamate and benzophenone-3, and coordinating the sunscreen synergistic effects of four plant extracts, namely, ginkgo leaf extract, cucumber extract, aloe extract and witch hazel extract. DETAILED DESCRIPTION

[0029] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0030] Example 1 A sunscreen comprises a chemical sunscreen, a physical sunscreen, an emulsifier, a moisturizer, an oil control agent, glycerin, propylene glycol, ginkgo leaf extract, cucumber extract, aloe extract, witch hazel extract, essence, preservative and water.

[0031] Among them, chemical sunscreens are composed of ethylhexyl methoxycinnamate and benzophenone-3.

[0032] Among them, physical sunscreens are composed of silicon-treated titanium dioxide and zinc oxide.

[0033] Among them, the emulsifier is composed of cetyl polyethylene glycol (EM90), sorbitan sesquioleate (SPAN 83), PEG-10 polydimethylsiloxane and PEG-30 dipolyhydroxystearate.

[0034] Among them, the emollient is composed of isopropyl myristate, dicaprylyl carbonate and ethylhexyl palmitate.

[0035] Among them, the oil control agent is magnesium sulfate heptahydrate.

[0036] Among them, the preservative is p-hydroxybenzoic acid.

[0037] Among them, ginkgo leaf extract was purchased from Changsha Shanghe Biotechnology Co., Ltd. using water extraction method and an extraction ratio of 10:1.

[0038] The cucumber extract was purchased from Shanghai Lianmai Bioengineering Co., Ltd. using water extraction at a ratio of 5:1.

[0039] Among them, aloe vera extract was purchased from Shanghai Lianmai Bioengineering Co., Ltd. using water extraction method with an extraction ratio of 5:1.

[0040] Among them, the North American witch hazel extract was purchased from Ningxia Vanilla Biotechnology Co., Ltd. using a water extraction method with an extraction ratio of 10:1.

[0041] Wherein, the preparation method of sunscreen comprises the following steps: Step 1: Take an emulsifier and a moisturizer, mix them evenly, then add a chemical sunscreen and a physical sunscreen, raise the temperature to 80°C while stirring, to obtain material 1, and keep warm for later use; take water, an oil control agent, glycerin and propylene glycol, mix them, raise the temperature to 85°C while stirring, to obtain material 2, and keep warm for later use.

[0042] Step 2: At 85°C, slowly pump material 2 into material 1. After the pumping is completed, homogenize for 8 minutes, then keep warm and stir for 8 minutes, and evacuate to obtain material 3.

[0043] Step 3: Cool material 3 to below 40° C., add the remaining raw materials, and stir evenly to obtain the sunscreen.

[0044] Example 2 A sunscreen, which is different from Example 1 in that it comprises a chemical sunscreen, a physical sunscreen, an emulsifier, a moisturizer, an oil control agent, glycerin, propylene glycol, ginkgo leaf extract, cucumber extract, aloe extract, witch hazel extract, essence, preservative and water.

[0045] Wherein, the preparation method of sunscreen comprises the following steps: Step 1: Take an emulsifier and a moisturizer, mix them evenly, then add a chemical sunscreen and a physical sunscreen, and heat them to 80°C while stirring to obtain material 1, which is kept warm for later use; take water, an oil control agent, glycerin and propylene glycol, mix them, and heat them to 80°C while stirring to obtain material 2, which is kept warm for later use.

[0046] Step 2: At 85°C, slowly pump material 2 into material 1. After the pumping is completed, homogenize for 10 minutes, then keep warm and stir for 5 minutes, and evacuate to obtain material 3.

[0047] Step 3: Cool material 3 to below 40° C., add the remaining raw materials, and stir evenly to obtain the sunscreen.

[0048] Example 3 A sunscreen, which is different from Example 1 in that it comprises a chemical sunscreen, a physical sunscreen, an emulsifier, a moisturizer, an oil control agent, glycerin, propylene glycol, ginkgo leaf extract, cucumber extract, aloe extract, witch hazel extract, essence, preservative and water.

[0049] Wherein, the preparation method of sunscreen comprises the following steps: Step 1: Take an emulsifier and a moisturizer, mix them evenly, then add a chemical sunscreen and a physical sunscreen, and heat them to 85°C while stirring to obtain material 1, which is kept warm for later use; take water, an oil control agent, glycerin and propylene glycol, mix them, and heat them to 85°C while stirring to obtain material 2, which is kept warm for later use.

[0050] Step 2: At 80°C, slowly pump material 2 into material 1. After the pumping is completed, homogenize for 5 minutes, then keep warm and stir for 10 minutes, and evacuate to obtain material 3.

[0051] Step 3: Cool material 3 to below 40° C., add the remaining raw materials, and stir evenly to obtain the sunscreen.

[0052] The amounts of raw materials used in Examples 1-3 are shown in Table 1.

[0053] Table 1: Comparative Example 1 A sunscreen, which is different from Example 1 in that an equal amount of ginkgo leaf extract is replaced by a dandelion extract purchased from Changsha Shanghe Biotechnology Co., Ltd., using a water extraction method at an extraction ratio of 10:1.

[0054] Comparative Example 2 A sunscreen, which is different from Example 1 in that an equal amount of cucumber extract is replaced by kale extract, which is purchased from Fufeng Snort Biotechnology Co., Ltd. and is extracted by water with an extraction ratio of 5:1.

[0055] Comparative Example 3 A sunscreen, which is different from Example 1 in that an equal amount of aloe vera extract is replaced by a ganoderma lucidum extract purchased from Shaanxi Wanyuan Biotechnology Co., Ltd., using a water extraction method at an extraction ratio of 5:1.

[0056] Comparative Example 4 A sunscreen, which is different from Example 1 in that an equal amount of witch hazel extract is replaced by a fig extract purchased from Shaanxi Hengxi Biotechnology Co., Ltd., using a water extraction method and an extraction ratio of 10:1.

[0057] Comparative Example 5 A sunscreen cream, which is different from Example 1 in that equal amounts of ginkgo leaf extract, cucumber extract, aloe extract and witch hazel extract are replaced by water.

[0058] 1. Sunscreen stability test The appearance, cold resistance (-15°C, continuous 24h), and heat resistance (48°C, continuous 24h) of the sunscreens of the above embodiments and comparative examples were tested. The test results are shown in Table 2.

[0059] 2. Sunscreen safety testing A total of 80 volunteers aged between 18 and 50 were selected and randomly divided into 8 groups. Each group applied 0.5 g of the corresponding sunscreen of the embodiment or comparative example on the inner side of the arm and behind the ear, respectively, with an area of ​​2 cm*2 cm. The skin reactions after 24 hours and 72 hours were observed and recorded. The test results are shown in Table 2.

[0060] Combining the analysis of Examples 1 to 3, Comparative Examples 1 to 5 and Table 2, it can be concluded that the sunscreen prepared by the present application has a delicate and uniform appearance, good cold resistance and heat resistance, and can remain stable at extreme temperatures without stratification or deterioration. In the skin safety test, all subjects did not experience adverse reactions such as redness, swelling, and itching within 24 hours and 72 hours after using the sunscreen prepared by the present application, indicating that the sunscreen of the present application has certain safety and reliability.

[0061] 3. Inhibition of ROS production HaCat cells were cultured in DMEM high-glucose medium containing 5% FBS (37°C, 5% CO2) for 24 h, then resuspended and counted. The density was 6*10 4 The cells were transferred into a 96-well plate and cultured for 24 hours. After the cells adhered to the wall, the culture medium was discarded and replaced with a culture medium containing the sunscreen of the above-mentioned embodiments and comparative examples. The concentration of the sunscreen in the culture medium was 2.5%. The positive control group. The negative control group used a blank culture medium. After that, it was induced with UVB. The negative control group was not induced by UVB. After 3 hours, the cells were collected and washed with pre-cooled PBS, incubated with the DCF-DA active oxygen probe in the dark (37°C, 30min), then centrifuged and washed with PBS, detected and analyzed by flow cytometry, and the ROS generation of the negative control group was counted as 100%, and the relative ROS generation (%) of the experimental group and the positive control group was calculated. The test results are shown in Table 3.

[0062] Table 3: Combining the data analysis of Examples 1 to 3, Comparative Examples 1 to 5 and Table 23, it can be seen that the sunscreen prepared in the present application has a good ROS generation inhibition effect, which indicates that the synergistic effect of the ginkgo leaf extract, cucumber extract, aloe extract and witch hazel extract not only improves the sunscreen effect, but also significantly reduces the generation of ROS caused by ultraviolet rays, thereby effectively protecting the skin from free radical damage. At the same time, combined with the analysis of Example 1 and Comparative Examples 1 to 5, it can also be seen that the synergistic effect of the ginkgo leaf extract, cucumber extract, aloe extract and witch hazel extract has particularity, and only the synergistic effect of the ginkgo leaf extract, cucumber extract, aloe extract and witch hazel extract can significantly reduce the generation of ROS caused by ultraviolet rays.

[0063] 4. Human testing A total of 80 volunteers aged between 18 and 50 years old, with an average age of 31.12 years old, were randomly divided into 8 groups, and the sunscreens of the above embodiments and comparative examples were subjected to SPF tests and long-term use evaluations.

[0064] SPF test: refer to the specific SPF value test method in the 2015 version of the Cosmetic Safety Technical Specifications. The subject takes a forward tilted position and irradiates the back, with one of the backs not less than 30cm away. 2 Normal skin area, (2.00±0.05)mg / cm 2The sample to be tested is evenly applied to the above area, and then an appropriate ultraviolet irradiation dose is selected for irradiation. The minimum erythema dose (MED value) is recorded and the SPF value is calculated. SPF value = MED value of protected skin / MED value of unprotected skin.

[0065] Long-term use evaluation: The testers took about 0.5g of sunscreen and evenly applied it on their faces after washing their skin in the morning and afternoon respectively. They used it for 30 consecutive days and evaluated the effect of the sunscreen. The evaluation criteria are as follows: Good: Feeling comfortable, skin exposure index is basically zero; Good: Average self-esteem and moderate sunburn index; Poor: The skin sunburn index is high before and after use.

[0066] Table 4: Group SPF value Long-term use evaluation Example 1 20.96 10 people rated excellent Example 2 21.35 10 people rated excellent Example 3 20.71 10 people rated excellent Comparative Example 1 16.82 5 people rated it excellent, 5 people rated it good Comparative Example 2 16.25 4 people rated it as excellent, 6 people rated it as good Comparative Example 3 17.19 5 people rated it excellent, 5 people rated it good Comparative Example 4 17.58 6 people rated it as excellent, 4 people rated it as good Comparative Example 5 15.32 2 people rated it as excellent, 8 people rated it as good Combining the data analysis of Examples 1 to 3, Comparative Examples 1 to 5 and Table 23, it can be seen that the sunscreen prepared by the present application performs well in the SPF test and shows a good sunscreen effect. In the long-term use evaluation, the subjects also gave the sunscreens of Examples 1 to 3 an "excellent" evaluation, indicating that the sunscreens of Examples 1 to 3 can effectively protect the skin during use and enhance the comfort of the user.

[0067] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A sunscreen, characterized in that: The invention comprises the following raw materials in percentage by mass: 6%~10% chemical sunscreen, 4%~8% physical sunscreen, 2.1%~2.6% emulsifier, 20%~27% moisturizer, 1.1%~1.3% oil control agent, 10%~12% glycerin, 2.1%~2.3% propylene glycol, 0.9%~1.4% ginkgo leaf extract, 0.5%~1% cucumber extract, 1%~1.5% aloe extract, 0.6%~1.2% witch hazel extract, 0.1%~0.5% flavor, 0.5%~1% preservative, and the balance is water.

2. A sunscreen according to claim 1, characterized in that: The chemical sunscreen consists of ethylhexyl methoxycinnamate and benzophenone-3, and in terms of the mass percentage of the sunscreen, comprises 5% to 7% of ethylhexyl methoxycinnamate and 1% to 3% of benzophenone-3.

3. A sunscreen according to claim 1, characterized in that: The physical sunscreen consists of silicon-treated titanium dioxide and zinc oxide, and in terms of mass percentage of the sunscreen, comprises 2% to 4% of silicon-treated titanium dioxide and 2% to 4% of zinc oxide.

4. A sunscreen according to claim 1, characterized in that: The emulsifiers include cetyl polyethylene glycol, sorbitan sesquioleate, PEG-10 dimethicone, and PEG-30 dipolyhydroxystearate.

5. A sunscreen according to claim 1, characterized in that: Such emollients include isopropyl myristate, dicaprylyl carbonate, and ethylhexyl palmitate.

6. A sunscreen according to claim 1, characterized in that: The oil control agent is magnesium sulfate heptahydrate.

7. A sunscreen according to claim 1, characterized in that: The mass ratio of the ginkgo leaf extract, cucumber extract, aloe vera extract and witch hazel extract is 1.2:0.8:1.2:0.

9.

8. A method for preparing a sunscreen according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: Take an emulsifier and a moisturizer, mix them evenly, then add a chemical sunscreen and a physical sunscreen, stir while heating to 80-85°C, to obtain material 1, and keep warm for later use; take water, an oil control agent, glycerin and propylene glycol, mix them, stir while heating to 80-85°C, to obtain material 2, and keep warm for later use; Step 2: At 80-85°C, slowly pump material 2 into material 1. After the pumping is completed, homogenize for 5-10 minutes, then keep warm and stir for 5-10 minutes, and evacuate to obtain material 3; Step 3: Cool material 3 to below 40° C., add the remaining raw materials, and stir evenly to obtain the sunscreen.

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