Sunscreen powder slurry containing high-content physical sunscreen agent as well as preparation method and application of sunscreen powder slurry

Abstract

The invention belongs to the technical field of cosmetics, and discloses sunscreen powder syrup containing a high-content physical sunscreen agent as well as a preparation method and application of the sunscreen powder syrup. The sunscreen powder slurry containing the high-content physical sunscreen agent is prepared from the following components in percentage by weight: 25 to 55 percent of zinc oxide, 20 to 50 percent of titanium dioxide, 15 to 32 percent of grease and 2.5 to 6.5 percent of dispersing agent, the dispersing agent is prepared from polyhydroxy stearic acid and polyglycerol-3 diisostearate. The sunscreen powder slurry is good in stability and free of layering, precipitation of metal ions can be effectively reduced, and when the sunscreen powder slurry is applied to an oil-in-water sunscreen product, the product system is stable, and the sunscreen powder slurry has good water resistance and also has a water explosion feeling and a high-power sunscreen effect.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of cosmetics, and particularly relates to a sunscreen powder containing a high content of physical sunscreen agent as well as a preparation method and application thereof. BACKGROUND

[0002] The components with sunscreen effect in sunscreen products are generally divided into chemical sunscreen agents and physical sunscreen agents. Compared with physical sunscreen agents, chemical sunscreen agents have a lighter and thinner use feeling in the formula. Although physical sunscreen agents are thick and heavy in skin feeling, they have high safety performance. In recent years, with the continuous in-depth study of sunscreen agents by the European Union, more and more chemical sunscreen agents have been found to interfere with the endocrine system, have potential genetic toxicity, reproductive toxicity, etc., and are limited in use or even banned, for example, 4-methyl benzylidene camphoramine has been banned by the European Union, and benzophenone-3, homosalate and octocrylene are limited in use. The high safety performance of physical sunscreen agents makes them used more and more frequently.

[0003] Physical sunscreen agents include titanium dioxide and zinc oxide. Most of the products containing physical sunscreen agents on the market are mainly added with a small amount of physical sunscreen agents and have a water-in-oil system. The reason is that there are two major difficulties in the application of physical sunscreen agents in the formula. Firstly, it is a great challenge to achieve a high sunscreen index without adding chemical sunscreen agents. For example, the particle size and the amount of physical sunscreen agents directly affect the sunscreen index. The smaller the particle size and the higher the amount, the more obvious the aggregation of physical sunscreen agents, which in turn leads to a decrease in the sunscreen index. Secondly, in the oil-in-water system, the ion precipitation problem of physical sunscreen agents exists. Physical sunscreen agents generally need to be treated with hydrophobic surface treatment (untreated, which has a large safety hazard due to photocatalytic activity). Titanium dioxide is usually treated with aluminum and silicon materials (such as silane coupling agent, aluminum oxide, aluminum hydroxide or aluminum stearate, etc.) on the surface. In the oil-in-water system, aluminum ions in titanium dioxide and zinc ions in zinc oxide are easy to precipitate, resulting in a large fluctuation in the pH of the formula system, and even forming a flocculation aggregation, which looks like a bean curd residue, thereby affecting the stability of the system. In addition, to achieve a high sunscreen index, a large amount of physical sunscreen agents need to be added in the oil-in-water formula system. Compared with the water-in-oil system, the physical sunscreen agent as the internal phase is easy to appear discontinuous with the water phase and the skin when spreading, and therefore a high content of water phase and oil phase thickening agents need to be added, which leads to the following shortcomings of the oil-in-water system in use: mud, thick and heavy skin feeling, weak film forming effect, and poor water resistance and sweat resistance.

[0004] Therefore, how to reduce the precipitation of metal ions of physical sunscreen agents in the oil-in-water sunscreen product, improve the water resistance, and improve the skin feeling is still a difficult problem to be solved in the field. SUMMARY

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application aims to provide a sunscreen powder slurry containing a high content of physical sunscreen agent, a preparation method and application thereof. The sunscreen powder slurry containing a high content of physical sunscreen agent has good stability and does not separate, and can effectively reduce the precipitation of metal ions. When the sunscreen powder slurry is applied to an oil-in-water sunscreen product, the product system is stable, has good water resistance, and has a water explosion feeling and high sunscreen effect.

[0006] In a first aspect, the present application provides a sunscreen powder slurry containing a high content of physical sunscreen agent, comprising the following components in terms of weight percentage: zinc oxide 25-55%, titanium dioxide 20-50%, oil 15-32%, and dispersant 2.5-6.5%; the dispersant comprises polyhydroxy stearic acid and polyglyceryl-3 diisostearate.

[0007] Specifically, the present application obtains a sunscreen powder slurry by matching a high content of physical sunscreen agent with oil and a specific dispersant (polyhydroxy stearic acid and polyglyceryl-3 diisostearate); the polyhydroxy stearic acid and polyglyceryl-3 diisostearate can uniformly anchor the physical sunscreen agents titanium dioxide and zinc oxide through electrostatic interaction and steric hindrance, improve the dispersing performance of the physical sunscreen agent, and further reduce the precipitation of metal ions by wrapping them with lipophilic end groups.

[0008] In some embodiments of the present application, the sunscreen powder slurry containing a high content of physical sunscreen agent comprises the following components in terms of weight percentage: zinc oxide 25%, titanium dioxide 40%, oil 31.5%, and dispersant 3.5%.

[0009] In some embodiments of the present application, the sunscreen powder slurry containing a high content of physical sunscreen agent comprises the following components in terms of weight percentage: zinc oxide 55%, titanium dioxide 20%, oil 20%, and dispersant 5%.

[0010] In some embodiments of the present application, the sunscreen powder slurry containing a high content of physical sunscreen agent comprises the following components in terms of weight percentage: zinc oxide 25%, titanium dioxide 50%, oil 19%, and dispersant 6%.

[0011] In some embodiments of the present application, the particle size of the titanium dioxide and zinc oxide is 30-600 nm. Within this particle size range, the titanium dioxide and zinc oxide can provide good sunscreen effect, and also have certain lightening and skin color hiding effect, so that the sunscreen powder slurry can be applied in many fields such as sunscreen care, sunscreen makeup base, etc. The titanium dioxide in the present application has been subjected to conventional surface treatment with silane coupling agent, aluminum oxide, aluminum hydroxide or aluminum stearate; the zinc oxide has been subjected to conventional surface treatment with silane coupling agent; the silane coupling agent includes but is not limited to triethoxysilane.

[0012] In some embodiments of the present application, the oil and fat includes at least two of dimethicone, isohexadecane, butyloctyl salicylate, isononyl isononanoate, isododecane, dicaprylyl carbonate, C12-15 alcohols benzoate, octyl proprylheptyl, glyceryl tri(ethylhexanoate), caprylic / capric triglyceride, squalane and dibutyl adipate.

[0013] In some embodiments of the present application, the oil and fat includes dimethicone, butyloctyl salicylate and isohexadecane.

[0014] In some embodiments of the present application, the oil and fat includes dimethicone and isohexadecane.

[0015] In some embodiments of the present application, the mass ratio of the polyhydroxy stearic acid and polyglyceryl-3 diisostearate is (1-2):(1-2).

[0016] In some embodiments of the present application, the sunscreen powder slurry does not contain chemical sunscreen agents.

[0017] In a second aspect of the present application, a preparation method of the sunscreen powder slurry containing high content of physical sunscreen agents according to the first aspect of the present application is provided, which comprises the following steps: Mixing the components, stirring, grinding, to obtain the sunscreen powder slurry containing high content of physical sunscreen agents.

[0018] In a third aspect of the present application, the use of the sunscreen powder slurry containing high content of physical sunscreen agents according to the first aspect of the present application in the preparation of oil-in-water sunscreen cosmetics is provided.

[0019] In some embodiments of the present application, the addition amount of the sunscreen powder slurry containing high content of physical sunscreen agents in the oil-in-water sunscreen cosmetics is ≤45 wt%, preferably 30-35 wt%.

[0020] In some embodiments of the present application, the oil-in-water physical sunscreen cosmetic includes oil-in-water physical sunscreen milk or oil-in-water physical sunscreen cream.

[0021] In a fourth aspect, the present application provides an oil-in-water physical sunscreen cream, comprising the sunscreen powder containing high content of physical sunscreen agent according to the first aspect of the present application.

[0022] In some embodiments of the present application, the content of the sunscreen powder containing high content of physical sunscreen agent in the oil-in-water physical sunscreen cream is ≤45 wt%, preferably 30-35 wt%.

[0023] In some embodiments of the present application, the content of the zinc oxide in the oil-in-water physical sunscreen cream is 7-25 wt%, preferably 7-20 wt%.

[0024] In some embodiments of the present application, the content of the titanium dioxide in the oil-in-water physical sunscreen cream is 7-25 wt%, preferably 7-18 wt%.

[0025] In some embodiments of the present application, the oil-in-water physical sunscreen cream further comprises sphingomonad ferment extract, microcrystalline cellulose and cellulose gum. The sphingomonad ferment extract with double helix structure forms a three-dimensional network structure, which cooperates with the cellulose gum and the microcrystalline cellulose through hydrogen bonding to uniformly anchor the oil phase particles. During the external pressing and rubbing process, water can be quickly released from the three-dimensional network structure to form a unique skin feel with a water explosion effect.

[0026] Specifically, the present application adds the sunscreen powder containing high content of physical sunscreen agent into the oil-in-water sunscreen system, and uses sphingomonad ferment, cellulose gum and microcrystalline cellulose as water phase thickening agents to prepare a sunscreen product with high sunscreen index, good waterproof effect, stable system and a skin feel of water explosion and freshness.

[0027] In some embodiments of the present application, the mass ratio of the sphingomonad ferment extract, the microcrystalline cellulose and the cellulose gum is (1-3):(1-5):1.

[0028] In some embodiments of the present application, the pH of the oil-in-water physical sunscreen cream is 7-7.5.

[0029] In some embodiments of the present application, the oil-in-water physical sunscreen cream further comprises at least one of chelating agent, polyol, emollient, film-forming agent, preservative and fragrance.

[0030] In some embodiments of the present application, the oil-in-water physical sunscreen cream does not contain chemical sunscreen agent.

[0031] Compared with the prior art, the present application has the following advantages: (1) The sunscreen powder slurry formula of the present application contains high content of physical sunscreen agent, which is combined with oil and specific dispersant (polyhydroxy stearic acid, polyglyceryl-3 diisostearate) to form a unique formula combination and scientific proportioning, so that the sunscreen powder slurry has good stability and does not separate, and can effectively reduce the precipitation of metal ions in the physical sunscreen agent.

[0032] (2) The sunscreen powder slurry of the present application is added to the oil-in-water system, which can effectively improve the instability of the system caused by the ion precipitation of the physical sunscreen agent, and the formula has good water resistance, effectively solving the problems of instability and poor water resistance of the traditional oil-in-water physical sunscreen system; further, in the oil-in-water system, the pure physical sunscreen cream prepared by using the water phase thickening agent of sphingomonad ferment extract, microcrystalline cellulose and cellulose gum, the thickening agent can effectively improve the continuity of the physical sunscreen agent, water phase and skin in the application process, and reduce or not add oil phase thickening agent, and in the process of external force extrusion, the sphingomonad ferment extract, microcrystalline cellulose and cellulose gum with synergistic effect rapidly release the emulsion droplets wrapped by the three-dimensional network structure to achieve the effect of water explosion, thereby overcoming the defects of traditional physical sunscreen cream such as heavy skin feeling, not refreshing, easy to knead and not easy to form film, realizing high multiple sunscreen effect, and having good water resistance, effectively solving the technical problems of instability of the system caused by the precipitation of zinc oxide and titanium dioxide cations in the traditional oil-in-water system, and unable to realize high content of physical sunscreen agent. DETAILED DESCRIPTION

[0033] The content of the present application is further described in detail through specific examples. The raw materials, reagents or devices used in the examples are commercially available or can be obtained by existing technical methods unless otherwise specified. Unless otherwise specified, the test or test method is a conventional method in the art.

[0034] Example 1 A sunscreen powder slurry containing high content of physical sunscreen agent, the specific formula of which is shown in Table 1.

[0035] Table 1

[0036] The preparation method of the above-mentioned sunscreen powder slurry containing high content of physical sunscreen agent is as follows: (1) Mix the components in the above table, and stir to wet the physical sunscreen agent to obtain a mixture; (2) Grind the above mixture through a three-roll mill for three times to obtain a sunscreen powder slurry containing high content of physical sunscreen agent.

[0037] Example 2 A sunscreen powder slurry containing high content of physical sunscreen agent, the specific formulation is shown in Table 2.

[0038] Table 2

[0039] The preparation method of the above-mentioned sunscreen powder slurry containing high content of physical sunscreen agent is as follows: (1) Mix the components in the above table, stir to wet the physical sunscreen agent, and obtain a mixture; (2) Grind the above mixture through a three-roll mill for three times, and obtain the sunscreen powder slurry containing high content of physical sunscreen agent.

[0040] Example 3 A sunscreen powder slurry containing high content of physical sunscreen agent, the specific formulation is shown in Table 3.

[0041] Table 3

[0042] The preparation method of the above-mentioned sunscreen powder slurry containing high content of physical sunscreen agent is as follows: (1) Mix the components in the above table, stir to wet the physical sunscreen agent, and obtain a mixture; (2) Grind the above mixture through a three-roll mill for three times, and obtain the sunscreen powder slurry containing high content of physical sunscreen agent.

[0043] The sunscreen powder slurry containing high content of physical sunscreen agent prepared in Examples 1-3 is stable and does not separate after standing at room temperature (25±2℃) for 7 days.

[0044] Comparative Example 1 Compared with Example 1, the difference is that the content of titanium dioxide in Comparative Example 1 is adjusted to 19%, and the content of dimethylpolysiloxane is adjusted to 39%, and the other components, contents and preparation methods are the same as those in Example 1.

[0045] The sunscreen powder slurry prepared in Comparative Example 1 is too thin, and separates after standing at room temperature for 30 minutes, which is not conducive to the subsequent production of sunscreen products.

[0046] Comparative Example 2 Compared with Example 2, the difference is that the content of zinc oxide in Comparative Example 2 is adjusted to 56%, and the content of dimethylpolysiloxane is adjusted to 3%, and the other components, contents and preparation methods are the same as those in Example 2.

[0047] Comparative Example 3 Compared with Example 3, the difference is that the content of titanium dioxide in Comparative Example 3 is adjusted to 51%, and the content of isohexadecane is adjusted to 16%, and the other components, contents and preparation methods are the same as those in Example 3.

[0048] Comparative Example 4 Compared with Example 1, the difference is that Comparative Example 4 does not contain polyglycerol-3 diisostearate, and the content of butyl octyl salicylate is adjusted to 8.5%. Other components, contents and preparation methods are the same as in Example 1.

[0049] Comparative Example 5 Compared with Example 1, the difference is that Comparative Example 5 does not add polyhydroxystearic acid, and the content of butyloctyl salicylate is adjusted to 8%. Other components, contents and preparation methods are the same as in Example 1.

[0050] Application Example 1 A water-in-oil physical sunscreen lotion, the specific formula of which is shown in Table 4.

[0051] Table 4

[0052] The preparation method of the above-mentioned water-in-oil physical sunscreen is as follows: (1) Add the aqueous phase to the emulsifying pot, heat to 75°C, and stir to homogenize and disperse evenly; (2) Add the oil phase to the oil phase pot, heat it to 75°C, then add the sunscreen powder paste from Example 1, stir to homogenize and disperse evenly; (3) Slowly pump the oil phase and sunscreen powder from step (2) into the emulsification pot from step (1), homogenize and stir at high speed for 15 minutes, cool down to 40°C, add other ingredients, and stir until homogenized. (4) Cool down to 38°C and discharge the material.

[0053] Application Example 2 The difference between Application Example 1 and Application Example 2 is that the sunscreen powder of Example 1 is replaced with the sunscreen powder of Example 2, and the content is increased to 35%, while the content of deionized water is reduced accordingly. Other components, contents and preparation methods are the same as those in Application Example 1.

[0054] Application Example 3 The difference between Application Example 1 and Application Example 3 is that the sunscreen powder of Example 1 is replaced with the sunscreen powder of Example 3, and the content is increased to 35%, while the content of deionized water is reduced accordingly. Other components, contents and preparation methods are the same as those in Application Example 1.

[0055] Application Comparative Example 1 The difference between Comparative Example 1 and Application Example 1 is that Comparative Example 1 replaces the sunscreen powder of Example 1 with an equal amount of the sunscreen powder of Comparative Example 1, while the other components, amounts added, and preparation methods are the same as in Application Example 1.

[0056] Application Comparative Example 2 The difference between the application comparative example 2 and the application example 2 is that the application comparative example 2 replaces the sunscreen powder slurry of the example 2 with the sunscreen powder slurry of the comparative example 2, and other components, additive amounts, and preparation methods are the same as those of the application example 2.

[0057] The oil-in-water physical sunscreen emulsion of the application comparative example 2 occurs phase inversion and demulsification during preparation.

[0058] Application Comparative Example 3 The difference between the application comparative example 3 and the application example 3 is that the application comparative example 3 replaces the sunscreen powder slurry of the example 3 with the sunscreen powder slurry of the comparative example 3, and other components, additive amounts, and preparation methods are the same as those of the application example 3.

[0059] The oil-in-water physical sunscreen emulsion of the application comparative example 3 occurs phase inversion and demulsification during preparation.

[0060] Application Comparative Example 4 The difference between the application comparative example 4 and the application example 1 is that the application comparative example 4 replaces the sunscreen powder slurry of the example 1 with the sunscreen powder slurry of the comparative example 4, and other components, additive amounts, and preparation methods are the same as those of the application example 1.

[0061] Application Comparative Example 5 The difference between the application comparative example 5 and the application example 1 is that the application comparative example 5 replaces the sunscreen powder slurry of the example 1 with the sunscreen powder slurry of the comparative example 5, and other components, additive amounts, and preparation methods are the same as those of the application example 1.

[0062] Application Comparative Example 6 The difference between the application comparative example 6 and the application example 1 is that the application comparative example 6 replaces the sphingomonas ferment extract, microcrystalline cellulose, and cellulose gum with the same amount of polyacrylate crosspolymer-6, and other components, additive amounts, and preparation methods are the same as those of the application example 1.

[0063] Application Comparative Example 7 The difference between the application comparative example 7 and the application example 1 is that the application comparative example 7 lacks microcrystalline cellulose and cellulose gum, and the amount of the lack is supplemented by the sphingomonas ferment extract, and other components, additive amounts, and preparation methods are the same as those of the application example 1.

[0064] Application Comparative Example 8 The difference between the application comparative example 8 and the application example 1 is that the application comparative example 8 replaces the sphingomonas ferment extract with the same amount of xanthan gum, and other components, additive amounts, and preparation methods are the same as those of the application example 1.

[0065] Application Comparative Example 9 The difference between the application comparative example 9 and the application example 1 is that the application comparative example 9 replaces the polyglyceryl-3 diisostearate with an equal amount of polyglyceryl-2 dipolyhydroxystearate, and other components, additive amounts, and preparation methods are the same as those of the application example 1.

[0066] The oil-in-water physical sunscreen cream of the application comparative example 9 cannot be emulsified because of oiling of the cream during the emulsification preparation process.

[0067] Application Comparative Example 10 The difference between the application comparative example 10 and the application example 1 is that the application comparative example 10 replaces the polyhydroxystearic acid with an equal amount of PEG-30 dipolyhydroxystearate, and other components, additive amounts, and preparation methods are the same as those of the application example 1.

[0068] The oil-in-water physical sunscreen cream of the application comparative example 10 cannot be emulsified because of the cream becoming bean curd residue during the emulsification preparation process.

[0069] Application Comparative Example 11 The difference between the application comparative example 11 and the application example 1 is that the application comparative example 11 replaces the microcrystalline cellulose with an equal amount of carboxymethyl cellulose, and other components, additive amounts, and preparation methods are the same as those of the application example 1.

[0070] Application Comparative Example 12 The difference between the application comparative example 12 and the application example 1 is that the application comparative example 12 replaces the cellulose gum with an equal amount of xanthan gum, and other components, additive amounts, and preparation methods are the same as those of the application example 1.

[0071] Test Example 1: Stability Test The high and low temperature stability test is performed as follows: the sample is placed in an electric thermostat at -15°C, 40°C, and 48°C for 90 days, and after recovery to room temperature, the sample is observed. The high and low temperature stability test results of the samples prepared in the application examples 1-3 and the application comparative examples 1, 4-8, 11-12 are shown in Table 5.

[0072] Table 5: High and low temperature stability test

[0073] From the high and low temperature stability test results, it can be seen that the samples of the application examples 1-3 have good stability after the high and low temperature stability test for 90 days, and the pH values of the samples before and after the test do not change significantly, which indicates that the sunscreen slurry in the application is applied in the oil-in-water system, the system has strong stability, and after the high and low temperature test, the zinc oxide and titanium dioxide do not cause cation precipitation, and do not change the pH value of the formula sample.

[0074] The stability test of the application comparative example 8 is unqualified, which may be because the stereoscopic structure of xanthan gum in the fluid is not enough for suspension thickening, and it is not suitable for application in the system containing high content of physical sunscreen agent, although it is also a double helix structure like the sphingomonas ferment extract.

[0075] Compared with the application example 1, the application comparative examples 1, 6-7 pass the 90-day stability test and the pH value does not fluctuate obviously, and the application comparative examples 4-5 respectively lack polyglyceryl-3 diisostearate and polyhydroxystearic acid, and after the 90-day high-low temperature stability test, unstable conditions occur at low temperature and high temperature respectively, and the pH value of the application comparative example 5 also changes greatly, which shows that in the preparation of sunscreen powder slurry and the application in the oil-in-water system, by adding polyglyceryl-3 diisostearate and polyhydroxystearic acid, the specific ingredients have a good effect of stabilizing the physical sunscreen agent, which can effectively reduce the aggregation of the physical sunscreen agent and the precipitation of the cations, and increase the stability of the formula system.

[0076] Test example 2: consumer evaluation test 2.1 Preparation of experimental samples The samples prepared by the application examples 1-3, and the application comparative examples 1, 4-7, 11-12 are used.

[0077] 2.2 Experimental method 50 healthy women aged 18-45 years old are selected, and the test personnel need to meet the condition of using sunscreen cream ≥4 times a week. The above samples are used respectively. Before the test, the subjects are required to wash their faces and enter a constant temperature and humidity room with a temperature of 22±1℃ and a humidity of 50±10% 2 hours after washing, and sit for 30 minutes and keep a relaxed state. The evaluation method is to smell the smell first, observe visually, apply the sample on the face, eyes, fingertips and facial skin, feel the cooperation, and score the indicators such as application feeling, water explosion feeling, sticky feeling, brightening effect, etc. The score of each indicator is 5 points, of which the highest score is 5 (very good) and the lowest score is 1 (very poor), and the intermediate score can be 0.1, 0.25, 0.50, 0.75, etc.

[0078] 2.3 Experimental results According to the sensory evaluation, the test evaluation table is filled out, the experimental test evaluation table is collected, and the statistical results are shown in table 6.

[0079] Table 6: subjective analysis of samples

[0080] From the subjective analysis of the samples in Table 6, it can be seen that the samples of application examples 1-3 have scores of 4.5 or above in terms of application feeling and water explosion feeling, and lower scores in terms of sticky feeling, which indicates that the sunscreen powder slurry of the present application applied to the oil-in-water pure physical sunscreen system has excellent skin feeling, strong water explosion feeling, and is refreshing and not sticky.

[0081] In terms of lightening effect score, application example 1 has good uniform skin lightening effect and good application in sunscreen base makeup; application examples 2-3 each add high content of zinc oxide and titanium dioxide, and also have good uniform skin lightening effect, but the addition of high content of physical sunscreen usually leads to a fake white situation, which indicates that the sunscreen powder slurry of the present application applied to the oil-in-water pure physical sunscreen system does not have a fake white situation and can effectively improve the disadvantage of fake white caused by high addition of physical sunscreen.

[0082] In terms of application feeling, the score of application comparative example 5 is lower compared with application example 1, and in combination with the lower uniform skin lightening score, it is speculated that the lack of polyhydroxy stearic acid in the sunscreen powder slurry leads to easy aggregation of the physical sunscreen, resulting in uneven application and affecting the uniform skin lightening effect. Compared with application example 1, the application feeling and water explosion feeling of application comparative example 6 are significantly reduced, which indicates that the water phase thickening agent composed of sphingomonas ferment extract, cellulose gum and microcrystalline cellulose can provide a unique water explosion skin feeling when the sunscreen powder slurry is applied to the oil-in-water pure physical sunscreen system. Compared with application example 1, the scores of application comparative examples 7, 11 and 12 in terms of water explosion feeling are reduced to different degrees, and the scores of sticky feeling are higher, which indicates that although the sphingomonas ferment extract can provide a certain water explosion feeling, when it is compounded with cellulose gum and microcrystalline cellulose, a better unique skin feeling of refreshing and not sticky and water explosion can be achieved.

[0083] From the comprehensive subjective score results, it can be seen that when the sunscreen powder slurry of the present application is applied to the oil-in-water pure physical sunscreen system, the sphingomonas ferment extract is combined with microcrystalline cellulose and cellulose gum as a water phase thickening agent, and the sunscreen product prepared has a skin feeling of water and refreshing and has a water explosion feeling, and the formula system is stable and has wide universality, and can be applied in many fields such as base makeup sunscreen and pure physical sunscreen.

[0084] Test example 3 sunscreen index and water resistance test 3.1 Preparation of experimental samples Samples prepared by application examples 1-3, and application comparative examples 1, 4-7, 11-12 were used.

[0085] 3.2 Test method and instrument Instrument: UV-2000S sunscreen index tester, Labsphere company.

[0086] Under the condition of temperature 20±2℃, relative humidity 50±10%, the test sample was taken by disposable syringe, latex medical gloves were worn to evenly spread on the PMMA plate, after 40 minutes of water bath, the transmittance of 290-400nm was scanned, and the sunscreen index SPF value and PFA value of the sample were calculated by software, each sample was spread for 5 times, and the average value was taken.

[0087] 3.3 Test results The results are shown in Table 7.

[0088] Table 7 Sunscreen index test results

[0089] As can be seen from Table 7, the samples of application examples 1-3 have high SPF value, PFA value, high sunscreen index, and after 40 minutes of water bath, the sunscreen index does not decrease obviously, which shows that the sunscreen powder slurry of the application applied to the oil-in-water pure physical sunscreen system has good water resistance.

[0090] Compared with application example 1, the SPF value of the samples of application examples 4-5 decreases, while the SPF value of application examples 6-7 does not change obviously, which may be related to the fact that polyglyceryl-3 diisostearate can make the physical sunscreen more evenly dispersed on the skin (PMMA plate), reduce the occurrence of sunscreen voids (i.e. unevenly protected areas), and polyhydroxy stearic acid can better disperse the physical sunscreen.

[0091] After 40 minutes of water bath, the SPF value of the sample of application example 4 decreases by 32.0%, while the SPF value of the samples of application examples 5-7, 11-12 does not change obviously after water bath, which shows that polyglyceryl-3 diisostearate can effectively improve the water resistance of sunscreen powder slurry applied in oil-in-water pure physical sunscreen system.

[0092] The preferred embodiments of the application are described in detail above, but the application is not limited to the described embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A sunscreen powder, characterized in that, The product comprises, by weight percentage: 25-55% zinc oxide, 20-50% titanium dioxide, 15-32% oil and fat and 2.5-6.5% dispersant; the dispersant includes polyhydroxystearic acid and polyglycerol-3 diisostearate.

2. The sunscreen powder according to claim 1, characterized in that, The oil comprises at least two of the following: polydimethylsiloxane, isohexadecane, butyl octyl salicylate, isononyl isononanoate, isododecane, dioctyl carbonate, C12-15 alcohol benzoate, propyl heptyl octanoate, triglyceride (ethylhexanoate), caprylic / decanoic acid triglyceride, squalane, and dibutyl adipate.

3. The sunscreen powder according to claim 1, characterized in that, The mass ratio of polyhydroxystearic acid to polyglycerol-3 diisostearic acid is (1-2):(1-2).

4. The method for preparing the sunscreen powder according to any one of claims 1-3, characterized in that, Includes the following steps: The components are mixed, stirred, and ground to obtain the sunscreen powder paste.

5. The use of the sunscreen powder according to any one of claims 1-3 in the preparation of water-in-oil type sunscreen cosmetics.

6. The application according to claim 5, characterized in that, The amount of the sunscreen powder added to the water-in-oil type sunscreen cosmetic is ≤45wt%.

7. A water-in-oil physical sunscreen lotion, characterized in that, Includes the sunscreen powder as described in any one of claims 1-3.

8. The water-in-oil physical sunscreen lotion according to claim 7, characterized in that, The content of the sunscreen powder in the water-in-oil physical sunscreen lotion is ≤45wt%.

9. The water-in-oil physical sunscreen lotion according to claim 7, characterized in that, It also includes Sphingosine monocytogenes fermentation product extract, microcrystalline cellulose, and cellulose gum.

10. The water-in-oil physical sunscreen lotion according to claim 9, characterized in that, The mass ratio of the Sphingomonas fermentation product extract, microcrystalline cellulose, and cellulose gum is (1-3):(1-5):1.

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