Sunscreen cream with cooling effect and preparation method thereof

Abstract

The application belongs to the technical field of daily chemical products, and discloses sunscreen cream with cooling effect and a preparation method thereof.The sunscreen cream comprises the following components: sunscreen agent, emulsifier, emollient, thickening agent and humectant; the thickening agent is sodium polyacrylate grafted starch and sodium carbomer; and the addition amount of the thickening agent in the sunscreen cream is greater than or equal to 0.8 wt%.The sunscreen cream has obvious cooling effect, is refreshing and not greasy, and has good ability to resist ultraviolet rays after use, wherein the SPF value is as high as 45.1, the PFA value is as high as PA++++, the sunscreen cream is mild and has strong stability.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of daily chemical products, and particularly relates to a sunscreen cream with a cooling effect and a preparation method thereof. BACKGROUND

[0002] Outdoor activities not only need to resist the damage of ultraviolet rays to the skin, but also need to guard against the high-temperature damage of sunlight to the skin. The common sunscreen products with cooling and cooling effects on the market are usually mainly added with alcohol and menthol. Although menthol has elegant cooling fragrance and cooling effect on the skin, its shortcomings are also obvious enough. For example, the fragrance of menthol has special recognition, and some consumers do not like the smell, and the volatility is extremely strong, the cooling effect on the skin is short, and the strong volatility can bring strong cooling to the skin with a small amount of menthol, which is similar to the spiciness, both of which belong to composite sensation. Therefore, different consumers have different tolerances to the cooling, and for consumers with weak skin, such products with cooling and cooling effects may cause potential irritation. Compared with menthol, alcohol brings actual skin temperature reduction, but in the volatilization process, it can take away the water on the skin epidermis, which can cause skin water loss and even cause skin irritation. In addition, in order to achieve a high sun protection factor, sunscreen products, especially high sun protection factor sunscreen products, need to add a high content of sunscreen agents. Most sunscreen agents are oil-soluble, and the addition of a high content of sunscreen agents means that the proportion of oil-soluble ingredients in the sunscreen product needs to be greatly increased, which can cause the skin to appear obvious and heavy oil light when the consumer uses the sunscreen product, affecting the consumer's use experience.

[0003] Therefore, it is a technical problem to be solved urgently to develop a sunscreen product with cooling effect, mildness, and matte after use. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a sunscreen cream with a cooling effect and a preparation method thereof. The sunscreen cream not only has obvious cooling effect, but also has high mildness, no obvious oil light on the skin after use, and high SPF value and PFA value.

[0005] The first aspect of the present application provides a sunscreen cream, which comprises the following components: sunscreen agent, emulsifier, emollient, thickening agent and humectant; the thickening agent is sodium polyacrylate grafted starch and sodium carbomer; the addition amount of the thickening agent in the sunscreen cream is ≥0.8wt%.

[0006] According to some embodiments of the present application, the addition amount of the thickening agent in the sunscreen cream is 0.8-3wt%.

[0007] According to some embodiments of the present application, the sunscreen agent is added to the sunscreen cream in an amount of 8-20 wt%.

[0008] According to some embodiments of the present application, the emulsifier is added to the sunscreen cream in an amount of 1-5 wt%.

[0009] According to some embodiments of the present application, the emollient is added to the sunscreen cream in an amount of 10-20 wt%.

[0010] According to some embodiments of the present application, the humectant is added to the sunscreen cream in an amount of 2-15 wt%.

[0011] According to some embodiments of the present application, the sunscreen cream further comprises a solvent and cosmetically acceptable excipients.

[0012] According to some embodiments of the present application, the excipients comprise at least one of a preservative, a fragrance, a skin conditioning agent, a chelating agent, and a pH adjusting agent.

[0013] According to some embodiments of the present application, the solvent is water.

[0014] According to some embodiments of the present application, the humectant comprises at least one of glycerin, butylene glycol, dipropylene glycol, glycereth-26, PEG / PPG / polybutylene glycol-8 / 5 / 3, and erythritol.

[0015] According to some embodiments of the present application, the emollient comprises at least one of tocopheryl acetate, dibutyl adipate, C12-15 alkyl benzoate, dicaprylyl carbonate, caprylic / capric triglyceride, isononyl isononanoate, propylheptyl caprylate, cetyl alcohol, cetearyl alcohol, and behenyl alcohol. The emollient used in the present application is a medium polar oil, which can increase the solubility of the solid sunscreen agent in the emollient, and avoid the precipitation of the sunscreen agent in the product.

[0016] According to some embodiments of the present application, the emulsifier comprises at least one of cetearyl glucoside, C12-20 alkyl glucoside, glyceryl stearate, PEG-100 stearate, sodium stearoyl glutamate, sodium cocoyl methyl taurate, sodium taurate, and sodium methyl stearoyl taurate.

[0017] According to some embodiments of the present application, the sunscreen agent comprises at least one of bis-ethylhexyloxyphenol methoxyphenyl triazine, dioxybenzone, ethylhexyl methoxyphenyl triazone, methylene bis-benzotriazolyl tetramethylbutylphenol, and isoamyl p-methoxycinnamate.

[0018] The second aspect of the present application provides a method for preparing the sunscreen cream of the present application, comprising the following steps:

[0019] Mixing the moisturizer, thickening agent and solvent, heating, stirring homogenization, to get the water phase;

[0020] Mixing the sunscreen, emollient and emulsifier, heating, stirring, to get the oil phase;

[0021] Adding the oil phase into the water phase, homogenizing emulsification, and stirring;

[0022] After the emulsification, cooling, adding the auxiliary materials, stirring homogenization, to get the sunscreen cream.

[0023] According to some embodiments of the present application, the temperature of the heating is 75-80℃.

[0024] According to some embodiments of the present application, the rotation speed of the homogenizing emulsification is 3000-9000rpm, and the time of the homogenizing emulsification is 10-30min.

[0025] According to some embodiments of the present application, the temperature of the cooling is 45-55℃.

[0026] Compared with the prior art, the present application has the following advantages:

[0027] The sunscreen cream of the present application uses sodium polyacrylate grafted starch and sodium carbomer as thickening agent, wherein the sodium polyacrylate grafted starch can absorb water and swell, and can uniformly adsorb and wrap a part of the oil phase particles in the homogenization process, and can uniformly spread the sunscreen on the skin in the use process, improving the sunscreen effect; meanwhile, by being matched with sodium carbomer, the two work together to release the moisture in the sunscreen cream during the application process, achieving the cooling effect.

[0028] The sunscreen cream of the present application not only has obvious cooling effect, but also is refreshing and non-greasy, and the skin after use is not shiny, showing a matte feeling, and has good ability to resist ultraviolet rays, wherein the SPF value is as high as 45.1, and the PFA value is as high as PA++++; the sunscreen cream of the present application is mild and has strong stability.

[0029] In the preparation process of the sunscreen cream of the present application, the thickening agent does not need to be additionally pretreated, only the oil phase, water phase and low-temperature feeding need to be distinguished, the operation process is simple, and the present application is suitable for industrial large-scale production. BRIEF DESCRIPTION OF DRAWINGS

[0030] The present application will be further described below in combination with the drawings and examples.

[0031] Figure 1 The skin oil light contrast chart of the samples of Example 3 and Comparative Example 6 after use. DETAILED DESCRIPTION

[0032] The present application will be further described in details by specific examples. The raw materials, reagents or devices used in the examples can be obtained from conventional commercial channels or can be obtained by prior art methods, unless otherwise specified. The test or test method is the conventional method in the art, unless otherwise specified.

[0033] Example 1

[0034] A sunscreen cream with cooling effect, the specific formula is shown in Table 1.

[0035] Table 1

[0036]

[0037] The preparation method of the sunscreen cream with cooling effect in this example includes the following steps:

[0038] (1) Add moisturizing agent, deionized water, thickening agent, citric acid and sodium citrate into the emulsifying pot, heat to 75℃, and stir and homogenize until uniform, as the water phase for standby;

[0039] (2) Add sunscreen agent, emollient and emulsifier into the oil phase pot, heat to 75℃, and stir appropriately until the oil phase is dissolved, transparent and uniform, as the oil phase for standby;

[0040] (3) Slowly draw the oil phase obtained in step (2) into the emulsifying pot of step (1), and perform high-speed homogenization at 5000 rpm for 20 minutes, and stir and disperse uniformly;

[0041] (4) After emulsification, cool to 45℃, then add phenoxyethanol and essence, stir and homogenize until uniform, then cool to 40℃, deaerate, and after the physical and chemical indexes are qualified, discharge, to obtain the sunscreen cream.

[0042] Example 2

[0043] A sunscreen cream with cooling effect, the specific formula is shown in Table 2.

[0044] Table 2

[0045]

[0046]

[0047] The preparation method of the sunscreen cream with cooling effect in this example is the same as that of Example 1.

[0048] Example 3

[0049] A sunscreen cream with cooling effect, the specific formula is shown in Table 3.

[0050] Table 3

[0051]

[0052]

[0053] The preparation method of the sunscreen cream with cooling effect in this example is the same as that in Example 1.

[0054] Comparative Example 1

[0055] The difference between Comparative Example 1 and Example 1 is only that the addition amount of thickening agent in Comparative Example 1 is adjusted to 0.6wt%, i.e. the addition amount of sodium polyacrylate grafted starch is 0.3wt%, and the addition amount of sodium carbomer is 0.3wt%; the rest of the components, the amount and the preparation method are the same as those in Example 1.

[0056] Comparative Example 2

[0057] The difference between Comparative Example 2 and Example 2 is only that sodium carbomer is not added in Comparative Example 2, i.e. the thickening agent is sodium polyacrylate grafted starch, and the addition amount is 3wt%; the rest of the components, the amount and the preparation method are the same as those in Example 2.

[0058] Comparative Example 3

[0059] The difference between Comparative Example 3 and Example 3 is only that the addition amount of thickening agent in Comparative Example 3 is adjusted to 3.5wt%, i.e. the addition amount of sodium polyacrylate grafted starch is 2.5wt%, and the addition amount of sodium carbomer is 1wt%; the rest of the components, the amount and the preparation method are the same as those in Example 3.

[0060] Comparative Example 4

[0061] The difference between Comparative Example 4 and Example 3 is only that the thickening agent is replaced by other conventional thickening agent, i.e. sodium polyacrylate grafted starch is replaced by equal amount of acryloyldimethyltaurine ammonium / behenyl alcohol polyoxyl-25 methacrylate cross-linked polymer, and sodium carbomer is replaced by equal amount of sodium polyacrylate; the rest of the components, the amount and the preparation method are the same as those in Example 3.

[0062] Comparative Example 5

[0063] The difference between Comparative Example 5 and Example 2 is only that the thickening agent is replaced by other conventional thickening agent, i.e. sodium polyacrylate grafted starch is replaced by equal amount of acryloyldimethyltaurine ammonium / behenyl alcohol polyoxyl-25 methacrylate cross-linked polymer; the rest of the components, the amount and the preparation method are the same as those in Example 3.

[0064] Comparative Example 6

[0065] Comparative Example 6 differs from Example 3 only in that Comparative Example 6 replaces the sodium polyacrylate grafted starch with an equal amount of sodium acrylates crosspolymer-2; the remaining components, amounts, and preparation method are the same as in Example 3.

[0066] Comparative Example 7

[0067] Comparative Example 7 differs from Example 3 only in that the preparation method of Comparative Example 7 is different from the preparation method of Example 3, and Comparative Example 7 refers to the invention patent with publication number CN115282067A for the pretreatment of the sodium polyacrylate grafted starch.

[0068] The preparation method of the sunscreen of Comparative Example 7 comprises the following steps:

[0069] (1) Mix the sodium polyacrylate grafted starch and part of the deionized water, soak, and disperse uniformly to obtain a sodium polyacrylate grafted starch solution;

[0070] (2) Add the humectant, the remaining deionized water, the sodium carbomer, the citric acid, and the sodium citrate into an emulsifying pot, heat to 75°C, and homogenize to uniformity under stirring, as a water phase for standby;

[0071] (3) Add the sunscreen agent, the emollient, and the emulsifier into an oil phase pot, heat to 75°C, and homogenize to transparency and uniformity under appropriate stirring, as an oil phase for standby;

[0072] (4) Slowly draw the oil phase obtained in step (3) into the emulsifying pot of step (2), and homogenize at 5000 rpm for 20 minutes, and stir to disperse uniformly;

[0073] (5) After emulsification, cool to 45°C, and then add the sodium polyacrylate grafted starch solution, the phenoxyethanol, and the fragrance, stir to disperse uniformly, and then cool to 40°C, deaerate, and detect the physical and chemical indexes to be qualified, then discharge to obtain the sunscreen.

[0074] Test Example 1 Human Cooling Effect Test

[0075] 1.1 Preparation of Test Sample

[0076] The samples of Examples 1-3 and Comparative Examples 1-6 were tested for human cooling effect.

[0077] 1.2 Preparations and Instruments Before Testing

[0078] Select 90 normal skin women aged 25-40 years old. Randomly divided into 9 groups, 10 people in each group. The test site cannot use any product (cosmetics or external medicine or oral health care products) for 15 days before the test. Before the test, the subjects were asked to wash their arms and enter a constant temperature and humidity room with a temperature of 22±1℃ and a humidity of 50±5% 2 hours after washing, sit for 30 minutes and keep a relaxed state. The contact temperature tester was used for temperature test.

[0079] 1.3 Cooling effect evaluation

[0080] In the experiment, the right arm of the volunteer was selected according to the random table, the elbow was marked with a 4*4 grid, and the skin temperature test was carried out in the grid. The test temperature was taken as the initial skin temperature T0, and the hot air was treated at a distance of 30 cm from the test point. The test site hot air treatment temperature T1 was recorded. During the use, the test personnel took an equal amount of test sample for testing, and after one minute of rubbing, the temperature of the test site was tested, and the sample temperature T2 after use was recorded. The lighting conditions at each time point should be consistent: the curtains are closed and the lighting is appropriate. The subjects lie in bed. The angle of the bed should be consistent at each time point. The position of the bed must be marked on the ground to ensure the consistency of the position during the test. The test of the same volunteer is completed by the same measurement personnel.

[0081] 1.4 Test results

[0082] The test results are shown in Table 4 below:

[0083] Among them, represents the average initial skin temperature, represents the average hot air treatment temperature, represents the average temperature after use of the sample.

[0084] Table 4

[0085]

[0086] As can be seen from Table 4, the temperature difference between the average temperature after use of the sample and the average hot air treatment temperature of the samples of Examples 1-3 is ≥3.89℃, while the maximum temperature difference of Comparative Examples 2-4 is only 3.15℃, which shows that the sunscreen cream of the present application has a significant cooling effect. From the cooling effect of Comparative Example 1 and Example 1, Comparative Example 2 and Example 2, it can be seen that when the amount of thickening agent added in the formula is too small or does not contain sodium carbomer, the cooling effect is not ideal; from the cooling effect of Comparative Example 4 and Example 3, it can be seen that when the type of thickening agent is completely changed, the cooling is only 2.12℃, and the effect is not ideal; from the cooling effect of Comparative Example 5 and Example 2, it can be seen that when the sodium polyacrylate grafted starch is replaced by other types of thickening agent, the cooling effect is also not ideal.

[0087] Sun protection factor test

[0088] 2.1 Preparation of samples

[0089] The samples of Examples 1-3 and Comparative Example 7 were subjected to sun protection factor tests.

[0090] 2.2 Test method and instrument

[0091] Instrument: SPF-290S sun protection factor analyzer, Optometrics, USA.

[0092] Under the conditions of a temperature of 20±2℃ and a relative humidity of 50±5%, the test sample was taken with a disposable syringe, a latex medical finger cot was worn, and the sample was evenly applied on a PMMA plate. After 20 minutes, the transmittance in the range of 290-400 nm was scanned, and the sun protection factor (SPF) value and the PFA value of the sample were calculated by software. Each sample was applied for testing 3 times, and the average value was taken.

[0093] 2.3 Test results

[0094] Table 5

[0095] Test sample SPF PA Example 1 19.8 PA++ Example 2 45.1 PA++++ Example 3 30.6 PA+++ Comparative Example 7 26.4 PA++

[0096] As can be seen from Table 5, the sun protection factor of the sunscreen cream of the present application can be from ordinary SPF 19.8 PA++ to high SPF 45.1 PA++++ by adjusting the addition amount of sunscreen agents and emollients in the formula within a limited range, which shows that the sunscreen cream provided by the present application can achieve a high sun protection factor and has a wide selection of sun protection factor. Comparative Example 7 has a large difference in SPF value compared with Example 3, which shows that the preparation method adopted by the present application can further improve the sun protection effect of the prepared sunscreen cream.

[0097] Consumer evaluation test

[0098] 3.1 Preparation of experimental samples

[0099] The samples of Examples 1-3 and Comparative Examples 1-6 were prepared.

[0100] 3.2 Experimental method

[0101] Select 90 normal skin women, age 20-40 years old, the test personnel need to meet the number of sunscreen use ≥4 times a week, and have a high demand for sunscreen. Randomly divided into 9 groups, respectively, using examples 1-3, comparative examples 1-6. Before the test, the subjects were asked to wash their faces and enter a constant temperature and humidity room 2 hours after washing, with a temperature of 22±1℃ and a humidity of 50±5%, sit for 30 minutes, and keep a relaxed state. During use, the sample is moisturized, and the oil gloss after use, mildness and other indicators are evaluated, and the score is 5 points, the higher the score, the higher the evaluation index (moisturizing, oil, mildness), and the highest score is 5 points, the lowest score is 1 point, and the intermediate score can be 0.25 / 0.50 / 0.75 etc. Difference.

[0102] 3.3 Experimental results

[0103] According to the sensory evaluation, fill in the trial evaluation form, collect the experimental trial evaluation form, and the statistical results are shown in Table 6:

[0104] Table 6

[0105] Evaluation results Moisturization Glossy feel after use Mildness Example 1 4.50 2.00 4.85 Example 2 4.65 1.35 4.83 Example 3 4.73 1.40 4.88 Comparative Example 1 4.48 1.85 4.88 Comparative Example 2 4.58 1.50 4.78 Comparative Example 3 4.65 1.33 4.78 Comparative Example 4 4.38 3.15 4.88 Comparative Example 5 4.43 3.25 4.88 Comparative Example 6 4.60 3.80 4.80

[0106] From the test results in Table 6, it can be seen that the mildness of the samples of examples 1-3, comparative examples 1-6 is relatively high; the results of comparative examples 4-5 are slightly lower in the evaluation of moisturizing index, which shows that under the same conditions, the addition of polyacrylic acid sodium grafted starch has better moisturizing performance; for the oil gloss after use, the scores of comparative examples 4-6 are higher, which shows that these samples have obvious oil gloss after use, while the scores of examples 1-3 and comparative examples 1-3 are lower, which shows that the oil gloss after use of the samples of the present application is not obvious, and has a certain matte feeling, which also shows that the addition of polyacrylic acid sodium grafted starch can significantly reduce the oil gloss after use of the sunscreen product.

[0107] The oil gloss of the skin after use of the samples of example 3 and comparative example 6 is compared as shown in Figure 1 From Figure 1 it can be seen that the sample of example 3 has no obvious oil gloss (left hand), while the sample of comparative example 6 has obvious oil gloss (right hand).

[0108] Test example 4 stability test

[0109] The high and low temperature stability test of the product was carried out as follows: the product was placed in a -15℃, 40℃, 48℃ electric thermostat for 30-90 days, and then observed after recovery at room temperature. The high and low temperature stability test results of examples 1-3, comparative examples 1-7 are shown in Table 7.

[0110] Table 7

[0111]

[0112]

[0113] From the above stability test results, it can be seen that Examples 1-3 have good stability, while Comparative Example 1 has delamination phenomenon in the high temperature test, which shows that the sunscreen cream with cooling effect provided by the present application has good stability by regulating the content of the thickening agent.

[0114] The preferred embodiments of the present application are specifically described above, but the present application is not limited to the described embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application. These equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A sunscreen characterized by, The sunscreen comprises the following components: sunscreen agent, emulsifier, emollient, thickener, and moisturizer; the thickener is sodium polyacrylate grafted starch and sodium carbomer; the amount of the thickener added to the sunscreen is 0.8-3 wt%; the amount of the sunscreen agent added to the sunscreen is 8-20 wt%; the amount of the emulsifier added to the sunscreen is 1-5 wt%; the amount of the emollient added to the sunscreen is 10-20 wt%; and the amount of the moisturizer added to the sunscreen is 2-15 wt%. The moisturizer includes at least one of glycerin, butylene glycol, dipropylene glycol, glycerin polyether-26, PEG / PPG / polybutylene glycol-8 / 5 / 3 and erythritol; The emollient includes at least one of tocopheryl acetate, dibutyl adipate, C12-15 benzoate, dioctyl carbonate, caprylic / capric triglyceride, isononyl isononanoate, propyl heptyl caprylate, cetyl alcohol, cetearyl alcohol, and behenyl alcohol. The emulsifier includes at least one of cetearyl glucoside, C12-20 alkyl glucoside, glyceryl stearate, PEG-100 stearate, sodium stearoyl glutamate, sodium cocoyl methyl taurate taurate, and sodium methyl stearoyl taurate. The sunscreen agent includes at least one of bis-ethylhexyloxyphenol methoxyphenyl triazine, diethylaminohydroxybenzoylhexyl benzoate, ethylhexyl methoxycinnamate, ethylhexyl triazine ketone, methylene bis-benzotriazolyl tetramethylbutylphenol, and p-methoxycinnamate isoamyl ester.

2. The sunscreen according to claim 1, characterized in that, The sunscreen also includes solvents and cosmetically acceptable excipients.

3. The sunscreen according to claim 2, characterized in that, The excipients include at least one of preservatives, fragrances, skin conditioning agents, chelating agents, and pH adjusters.

4. The method for preparing the sunscreen according to any one of claims 1 to 3, characterized in that, Includes the following steps: The humectant, thickener, and solvent are mixed, heated, and stirred to homogenize, yielding an aqueous phase. Sunscreen, emollient, and emulsifier are mixed, heated, and stirred to obtain the oil phase. The oil phase is added to the aqueous phase, homogenized and emulsified, and stirred. After emulsification, the mixture is cooled, then the excipients are added and stirred to homogenize, thus obtaining the sunscreen.

Images