A mild and non-irritating sunscreen lotion that enhances skin feel and its preparation method

Abstract

The present application provides a sunscreen milk with mildness, no irritation and improved skin feel, and a preparation method thereof, belonging to the field of cosmetics. In the present invention, sodium taurate and / or acrylate copolymer, which have an affinity and comfort for the skin feel and are fresh and non-greasy, are used as the skin feel keynote of the sunscreen milk, and bio-fermented polysaccharides are compounded to enhance the smooth feeling during application and improve the skin feel of the sunscreen milk; non-ionic polyglycerol fatty acid esters are used as the main emulsifier, which can achieve the expected effect of improving the softness of the skin and increase the fresh and lubricating skin feel; polyethylene glycol hydrogenated castor oil and / or polypropylene glycol-based non-ionic surfactants are used as co-emulsifiers, achieving the effect of mildness and no irritation; the sunscreen milk described in the present application selects fewer types of sunscreen agents to achieve the purpose of commuting sunscreen, which conforms to the research and development idea of a minimalist formula.

Description

Technical Field

[0001] This application belongs to the field of cosmetics, and particularly relates to a sunscreen lotion with mildness, no irritation and improved skin feel and a preparation method thereof. Background Art

[0002] Human activities are inevitably exposed to ultraviolet rays, and excessive ultraviolet irradiation will damage human health. The most direct is that the skin system is persecuted, causing skin tanning, sunburn, accelerating skin aging, and even leading to skin lesions or skin cancer in severe cases. The birth and use of sunscreen products effectively weaken the process of skin photoaging and greatly prevent skin lesions. After meeting the basic sunscreen demands of people, new requirements have emerged for other added values such as the skin feel, safety, high sun protection index, water resistance and sweat resistance of sunscreen. With the continuous upgrading and refinement of market products, these added values have gradually evolved into the basic standards of sunscreen products.

[0003] At present, sunscreen products on the market are classified into pure chemical (only containing ultraviolet absorbers) sunscreen products, pure physical (only containing ultraviolet scatterers) sunscreen products, and sunscreen products with both "physical" and "chemical" components according to the combination of sunscreen agents. Pure chemical sunscreen products are suitable for dry skin or combination-dry skin consumers. However, the chemical structure of ultraviolet absorbers causes strong stickiness or heaviness when using such products, which is unpleasant. Moreover, the large addition of ultraviolet absorbers greatly increases the potential possibility of skin irritation. Pure physical sunscreen products are suitable for sensitive skin people, pregnant women, infants and children, etc. To ensure a high-performance sun protection index, a high content of ultraviolet scatterers needs to be added to the formula, resulting in a poor use feeling. The above two types of sunscreen products can both ensure a high sun protection index, but they both have the weakness of poor use feeling due to the characteristics of the formula structure. Consumers psychologically reject "continuously" using such products, thus losing the sun protection for the skin. To solve the problem of poor skin feel, emulsified sunscreen products with high water content have emerged on the market, and the skin feel has been improved to some extent. However, the target audience is mostly ordinary people with good skin barriers, and there are still limitations for people with sensitive skin.

[0004] Patent CN201710595021.6 discloses an alcohol-based sunscreen oil and its preparation method, including sunscreen agents, water repellents, oils, polyols, and ethanol. Using ethanol as the base of the sunscreen oil simplifies the preparation process, has a strong sun protection index and a long-wave ultraviolet sun protection index, and a special sensory experience. However, its high content of ethanol is not suitable for consumers with sensitive skin. Even for consumers with healthy skin barriers, it cannot withstand daily use, and there may be a potential possibility of affecting the skin microecology.

[0005] Patent CN202011402291.9 discloses a water-in-oil sunscreen emulsion and its preparation method. The sunscreen emulsion contains at least an aqueous phase component, an emulsifier, an organic sunscreen agent, an inorganic sunscreen agent, a polymeric UVB filter, and vitamin E. It has strong sun protection ability, covers the entire ultraviolet spectrum for protection, and is not prone to crystallization and precipitation. However, in terms of skin feel, it still has the characteristic of a heavy oil feeling in the water-in-oil emulsion, which is likely to cause discomfort and affect the consumer's will to continue using it.

[0006] Therefore, it is very necessary to develop a sunscreen emulsion with excellent skin feel, high experience, long-lasting protection, mildness and no irritation, and improved skin feel. Summary of the Invention

[0007] Aiming at the deficiencies of the prior art, the present application aims to provide a sunscreen emulsion with mildness and no irritation and improved skin feel and its preparation method.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] A sunscreen emulsion with mildness and no irritation and improved skin feel, comprising the following components in mass percentage: 8.0 - 20.0% of an ultraviolet light scattering agent, 5.0 - 15.0% of an ultraviolet absorber, 5.0 - 25.0% of a dispersant, and the balance being water.

[0010] Among them:

[0011] The ultraviolet light scattering agent includes zinc oxide with a special hydrophobic surface treatment;

[0012] The zinc oxide with a special hydrophobic surface treatment is zinc oxide treated with a surface treatment agent, and the surface treatment agent is one or more of triethoxysilane octane, polydimethylsiloxane, and stearic acid;

[0013] Preferably, the treatment agent is triethoxysilane octane.

[0014] The initial particle size of the ultraviolet light scattering agent is 15 - 50 nm.

[0015] The ultraviolet absorber is selected from one or more of ethylhexyl triazone, diethylhexyl triazone, bis - ethylhexyl triazone, and octocrylene.

[0016] The dispersant is selected from one or more of dibutyl adipate, dioctyl carbonate, dipropylene glycol dicaprate, and isoisotridecyl isononanoate.

[0017] In some preferred embodiments, the mass ratio of the ultraviolet light scattering agent, the ultraviolet absorber, and the dispersant is 1.0 - 2.0:0.8 - 1.2:0.9 - 1.8.

[0018] Furthermore, the sunscreen milk further comprises one or more of a thickener, a humectant, an emollient, an antioxidant, an emulsifier and a chelating agent;

[0019] Among them:

[0020] The thickener is selected from (sodium taurate and / or acrylate) copolymers, or / and biopolyfermented polysaccharides, and its mass percentage content in the sunscreen milk is 0.2 - 2.5%.

[0021] Preferably, the thickener is a mixture of (sodium taurate and / or acrylate) copolymers and biopolyfermented polysaccharides;

[0022] The (sodium taurate and / or acrylate) copolymers are selected from one or more of sodium polyacrylate, acrylate copolymer, polyacrylate cross-linked polymer - 6, acrylamide / sodium acryloyldimethyltaurate copolymer, ammonium acryloyldimethyltaurate / VP copolymer, hydroxyethyl acrylate / sodium acryloyldimethyltaurate copolymer, hydroxyethyl acrylate / sodium acryloyldimethyltaurate copolymer;

[0023] The biopolyfermented polysaccharides are selected from one or more of xanthan gum, agar, scleroglucan, gum arabic, cyclodextrin, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, tara gum, tamarind seed gum, starch.

[0024] The humectant is selected from saccharide humectants or / and polyols, and its mass percentage content in the sunscreen milk is 0.05 - 12.00%.

[0025] The saccharide humectants are selected from one or more of β-glucan, sodium hyaluronate, betaine and trehalose;

[0026] The polyols include one or more of butanediol, 1,2 - pentanediol, 1,2 - hexanediol, dipropylene glycol, glycerol and methyl propylene glycol.

[0027] The emollient is selected from one or more of isononyl isononanoate, caprylic / capric triglyceride and vegetable oil, and its mass percentage in the sunscreen milk is 3.0 - 15.0%.

[0028] The antioxidant is selected from one or more of pentaerythrityl tetra(bis - tert - butylhydroxyhydrocinnamate) or / and p - hydroxyacetophenone, and its mass percentage in the sunscreen milk is 0.01 - 0.1%.

[0029] The emulsifier is selected from one or more of non - ionic polyglycerol fatty acid esters, polyethylene glycol hydrogenated castor oil and polypropylene glycol - type non - ionic surfactants, and its mass percentage in the sunscreen milk is 0.1 - 3.00%.

[0030] The nonionic polyglycerol fatty acid esters are selected from one or more of pentaglycerol stearate, hexaglycerol monostearate, decaglycerol distearate, decaglycerol caprylate / caprate, decaglycerol myristic acid ester, decaglycerol oleate, decaglycerol dipalmitate, decaglycerol decaoleate, and decaglycerol diisostearate;

[0031] The polyethylene glycol hydrogenated castor oil is selected from one or more of polyethylene glycol (10) hydrogenated castor oil, polyethylene glycol (20) hydrogenated castor oil, polyethylene glycol (25) hydrogenated castor oil, polyethylene glycol (30) hydrogenated castor oil, polyethylene glycol (35) hydrogenated castor oil, polyethylene glycol (40) hydrogenated castor oil, polyethylene glycol (45) hydrogenated castor oil, polyethylene glycol (50) hydrogenated castor oil, polyethylene glycol (60) hydrogenated castor oil, polyethylene glycol (80) hydrogenated castor oil, polyethylene glycol (100) hydrogenated castor oil, and polyethylene glycol (200) hydrogenated castor oil;

[0032] The polypropylene glycol type nonionic surfactant is selected from one or more of PPG-9 glyceryl ether, PPG-3 myristyl alcohol ether, PPG-11 stearyl alcohol ether, PPG-2-decyl alcohol polyether-30, PPG-5-lauryl alcohol polyether-5, PPG-8-cetyl alcohol polyether-20, PPG-28-butanol polyether-35, PPG-30-butanol polyether-30, PPG-12-butanol polyether-12, and PPG-26-butanol polyether-26;

[0033] The chelating agent is disodium EDTA, and its mass percentage in the sunscreen lotion is 0.02-0.50%.

[0034] The present application also provides a method for preparing the above-mentioned sunscreen lotion, comprising the following steps:

[0035] (1) Add water, moisturizer, chelating agent, thickener and emulsifier into an emulsifying pot, heat, stir and homogenize until the system is fully dispersed, swollen and dissolved uniformly to obtain phase A;

[0036] (2) Add the ultraviolet scattering agent, 1 / 2 of the dispersant, and the emollient into the oil phase pot and homogenize and disperse them until they are completely uniform to obtain phase B;

[0037] (3) The ultraviolet absorber, antioxidant, and remaining dispersant are placed in a stainless steel barrel, heated and stirred until completely dissolved and uniformly dissolved, and then cooled to obtain phase C;

[0038] (4) Add phase C into the oil phase pot and mix thoroughly with phase B;

[0039] (5) Pump the B and C phase mixture in the oil pan into the emulsifying pan to mix with the A phase, homogenize and stir until the system is fully emulsified and uniform, and then evacuate to remove bubbles to obtain the sunscreen lotion.

[0040] The heating temperature in the above step (1) is 45 - 75 °C, the stirring rate is 80% - 100% of the rate range, and the homogenization rate is 90 - 100% of the rate range;

[0041] The heating temperature in the above step (3) is 60 - 90 °C.

[0042] The emulsifying temperature in the above step (5) is 25 - 65 °C, the stirring rate is 80% - 100% of the rate range, and the homogenization rate is 90 - 100% of the rate range.

[0043] Compared with the prior art, the beneficial effects of this application are as follows:

[0044] (1) In the present invention, a (sodium taurate and / or acrylate) copolymer with a skin-friendly, comfortable, fresh and non-greasy feel is used as the skin feel keynote of the sunscreen lotion, and a bio-fermented polysaccharide is compounded to enhance the smoothness during application, improve the skin feel of the sunscreen lotion, thereby enhancing the product's usage persistence and expanding the audience.

[0045] (2) The sunscreen lotion of the present invention uses non-ionic polyglycerol fatty acid esters as the main emulsifier, which can achieve the expected effect of improving skin softness and increase the fresh and smooth skin feel; in addition, polyethylene glycol hydrogenated castor oil and / or polypropylene glycol type non-ionic surfactants are used as co-emulsifiers, which are very mild and the skin will not dry when used on sensitive skin; different from well-known sunscreen emulsification products on the market, the sunscreen lotion described in this patent selects fewer types of sunscreen agents to achieve the purpose of commuting sunscreen, which conforms to the research and development idea of a minimalist formula.

[0046] (3) In terms of the formula structure, the present invention abandons the traditional anti-corrosion system, utilizes the antibacterial ability provided by high-content zinc oxide itself, and the inhibition of the growth of bacteria and mold colonies by long and short carbon chain polyols to achieve the antibacterial effect, skillfully avoiding the potential risk of intolerance to traditional preservatives. Detailed Embodiments

[0047] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the following specific embodiments are used to further clarify the present invention. However, the following embodiments are only the preferred embodiments of the present invention, not all. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the present invention. The experimental methods in the following embodiments are all conventional methods unless otherwise specified. The materials, reagents, etc. used in the following embodiments can be obtained from commercial channels unless otherwise specified.

[0048] As follows:

[0049]

[0050]

[0051] Example 1: A sunscreen lotion with mildness, no irritation and improved skin feel and its preparation method

[0052] Its formula components are as follows:

[0053]

[0054] The preparation method includes the following steps:

[0055] S1: Put water, humectant, chelating agent, thickening agent and emulsifier into the emulsifying pot. After heating to 78 ± 1 °C, start stirring (at a rate of 100% of the range) and homogenizing (at a rate of 100% of the range) until the system is fully dispersed, swollen and dissolved evenly to obtain Phase A, and then cool it to room temperature for standby;

[0056] S2: Put the ultraviolet scattering agent, part of the dispersant and emollient into the oil phase pot and homogenize and disperse until completely uniform to obtain Phase B;

[0057] S3: Put the ultraviolet absorber, antioxidant and the remaining dispersant into a stainless steel bucket, heat to 75 ± 1 °C, stir until completely dissolved and uniform, and then cool down to obtain Phase C;

[0058] S4: Put Phase C into the oil phase pot and mix it fully with Phase B;

[0059] S5: Keep the emulsifying pot at 42 ± 1 °C, pump the mixture of Phase B and Phase C in the oil pot into the emulsifying pot and mix it with Phase A, homogenize (at a rate of 100% of the range) and stir (at a rate of 100% of the range) until the system is fully emulsified and uniform, and then pump it to vacuum degas to obtain the sunscreen lotion.

[0060] Example 2: A sunscreen lotion with mildness, no irritation and improved skin feel and its preparation method

[0061] Its formula components are as follows:

[0062]

[0063] The preparation method is the same as that of Example 1.

[0064] Example 3: A sunscreen lotion with mildness, no irritation and improved skin feel and its preparation method

[0065] Its formula components are as follows:

[0066]

[0067]

[0068] The preparation method is the same as that of Example 1.

[0069] Example 4 A sunscreen milk with mildness, no irritation and improved skin feel and its preparation method. The formula components are as follows:

[0070]

[0071] The preparation method is the same as that of Example 1.

[0072] Example 5 A sunscreen milk with mildness, no irritation and improved skin feel and its preparation method. The formula components are as follows:

[0073]

[0074]

[0075] The preparation method is the same as that of Example 1.

[0076] Example 6 A sunscreen milk with mildness, no irritation and improved skin feel and its preparation method. The formula components are as follows:

[0077]

[0078] The preparation method is the same as that of Example 1.

[0079] Comparative Example 1 A sunscreen milk containing ethanol and its preparation method

[0080] Its formula components are as follows:

[0081]

[0082]

[0083] The preparation method includes the following steps:

[0084] S1 Put water, humectant, chelating agent, thickener, and emulsifier into an emulsifying pot. After heating to 85 ± 1 °C, start stirring (at a rate of 100% of the range) and homogenizing (at a rate of 100% of the range) until the system is fully dispersed, swollen, and dissolved evenly to obtain Phase A, and then cool it to room temperature for standby;

[0085] S2 Put the ultraviolet scattering agent, part of the dispersant, and emollient into an oil-phase pot and homogenize and disperse until completely uniform to obtain Phase B;

[0086] S3 Put the ultraviolet absorber, antioxidant, and the remaining dispersant into a stainless steel barrel, heat to 75 ± 1 °C, stir until completely dissolved and uniform, and then cool down to obtain Phase C;

[0087] S4 feeds phase C into the oil phase pot and mixes it fully with phase B;

[0088] The emulsifying pot is maintained at 42 ± 1 °C. The B and C phase mixture in the oil pot is pumped into the emulsifying pot and mixed with phase A. Homogenize (at a rate of 100% of the full scale) and stir (at a rate of 100% of the full scale) until the system is fully emulsified and homogeneous. Then add the mixed phase D, homogenize (at a rate of 50% of the full scale) and stir (at a rate of 100% of the full scale) until the system is fully mixed and homogeneous. Then evacuate to remove air bubbles to obtain the sunscreen milk.

[0089] Comparative Example 2 A sunscreen milk and its preparation method

[0090] Its formula components are:

[0091]

[0092] The preparation method is the same as that of Example 1.

[0093] Comparative Example 3 A sunscreen milk and its preparation method

[0094] The ultraviolet scattering agent is different from that of Example 1. Its formula components are:

[0095]

[0096] The preparation method is the same as that of Example 1.

[0097] Comparative Example 4 A sunscreen milk and its preparation method The dispersant and emollient are different from those of Example 1. Its formula components are:

[0098]

[0099] The preparation method is the same as that of Example 1.

[0100] Comparative Example 5 A sunscreen milk and its preparation method

[0101] The ultraviolet absorber is different from that of Example 1. Its formula components are:

[0102]

[0103] The preparation method is the same as that of Example 1.

[0104] Comparative Example 6 A sunscreen milk and its preparation method

[0105] Change the ultraviolet scattering agent, and the mass ratio of the ultraviolet absorber and the dispersant is 1:1:0.25, which is not within the scope of protection of this application. Other components are the same as those of Example 5. Its components are as follows:

[0106]

[0107] The preparation method was the same as that of Example 1. When the preparation was discharged, the sunscreen milk of this comparative example had the phenomenon of sunscreen agent precipitation.

[0108] Comparative Example 7 A sunscreen milk and its preparation method

[0109] The mass ratio of the ultraviolet scattering agent, ultraviolet absorber and dispersant was changed to 1.6:1.0:2.8, which was not within the scope of protection of this application. The other components were the same as those in Example 5, and the components were as follows:

[0110]

[0111] The preparation method was the same as that of Example 1.

[0112] Comparative Example 8 A sunscreen milk and its preparation method

[0113] Among them, an ultraviolet scattering agent with an initial particle size of 80 - 100 nm was added, and the other components and preparation method were the same as those in Example 1 (note: the particle size of the ultraviolet scattering agent in Examples 1 - 6 and Comparative Examples 1 - 7 was 15 - 50 nm).

[0114] After the preparation of this comparative example was discharged for trial use, the whitening phenomenon was very serious, and the spreading property during application was not good. Moreover, in the stability test, different degrees of water separation occurred when it was placed at high temperature for 3 days, at low temperature for 6 days, and at room temperature for 11 days, and the powder agglomeration was serious; therefore, other relevant performance tests were not carried out.

[0115] Performance detection:

[0116] Test Example 1 Sunscreen effect test

[0117] The index used to characterize the sunscreen performance of sunscreen products is the sunscreen index. Currently, the commonly used sunscreen indices are SPF (Sun Protection Factor) and PA (or PFA, Protection Factor of UVA).

[0118] The level of the SPF value objectively reflects the size of the UVB ultraviolet protection ability of the sunscreen product. The larger the SPF value, the stronger the protection ability. The measurement result of SPF is determined by the minimal erythema dose (MED), as shown in the following formula.

[0119]

[0120] In the formula, MED is the minimal erythema dose, which refers to the lowest dose of ultraviolet irradiation (J / m2) or the shortest time (s) required to cause skin erythema, and the range reaches the edge of the irradiation point.

[0121] PA value is an indicator for evaluating the ability of sunscreen products to protect against UVA ultraviolet rays, also known as UVA protection index. The main physiological effect of UVA on the skin is skin darkening, which is measured by the minimum persistent pigment darkening dose (MPPD), as shown in the following formula:

[0122]

[0123] Where MPPD is the minimum UV radiation dose (J / m2) required to produce slight blackening on the skin in the entire irradiated area 2-4 hours after irradiation. 2 ) or minimum irradiation time (s).

[0124] Experiments 1-6 and comparative examples 6-7 were selected, and the protective capabilities of the samples were tested according to the sun protection index determination method (human body method) and the long-wave ultraviolet protection index determination method (human body method) involved in Chapter 8 of the "Technical Specifications for Safety of Cosmetics (2015 Edition)". The test results are shown in Table 1.

[0125] Table 1

[0126] Test Group SPF PA Example 1 35-45 +++ Example 2 35-45 +++ Example 3 35-45 ++++ Example 4 35-45 ++++ Example 5 35-45 +++ Example 6 35-45 +++ Comparative Example 6 20-35 +++ Comparative Example 7 20-35 +

[0127] As shown in Table 1, Examples 1-6 have a relatively high sun protection index through the reasonable combination of ultraviolet scattering agent and absorbent, which has met the sun protection needs in real life commuting activities. Compared with Example 5, the content of ultraviolet scattering agent in Comparative Example 6 remains unchanged, and the ultraviolet absorber component is increased. When the PA does not change much, the SPF is weakened, which is related to the precipitation of the sunscreen agent. Compared with Example 5, Comparative Example 7 reduces the content of ultraviolet absorber and scattering agent, increases the content of dispersant, and both SPF and PA values are reduced, which means that the sun protection ability is weakened. It should be noted that the content of ultraviolet absorber and protection ability are generally positively correlated, that is, the higher the content, the stronger the protection ability.

[0128] Test Example 2 Patch test for sensitive skin group

[0129] Samples were prepared according to the formulations and preparation methods of Examples 1-6 and Comparative Examples 1-2, and patch tests were performed on people with sensitive skin to detect the potential possibility of causing adverse skin reactions.

[0130] ①Screening method for sensitive skin population:

[0131] First, the lactic acid method was used to screen out people with sensitive skin. 5% lactic acid was applied to both sides of the nose wings of the subjects. At two time points of 2.5 minutes and 5.0 minutes, the skin was observed for erythema reaction. The observed values were 0 point, 1 point, 2 points, and 3 points. The redder the skin, the higher the score. Then, the observed values at the two time points of 2.5 minutes and 5.0 minutes were added together. If the sum was greater than 3, it was proved to be sensitive skin. The larger the number, the more sensitive the skin.

[0132] ② Patch test method:

[0133] Refer to the "Technical Specifications for Cosmetics Safety" (2015 Edition).

[0134] Test substance: The sunscreen lotions prepared in Examples 1-6 and Comparative Examples 1-2.

[0135] Blank group: Without adding any substances.

[0136] Subjects: 32 subjects with sensitive skin, including 26 females and 6 males, aged 22-45 years old. After screening the sensitive skin population, they met the volunteer selection criteria for subjects.

[0137] Test method: Select a suitable patch tester with an area not exceeding 50 mm 2 , and a depth of about 1 mm. Using the closed patch test method, about 0.020 - 0.025 g of the test substance was added to the patch tester. The patch tester was attached to the flexor side of the forearm of the subject with non-irritating tape, and gently pressed with the palm to make it evenly attached to the skin. The test site was marked for observation. After 24 hours, the test substance was removed, and the skin reactions were observed at 0.5, 24, and 48 hours after removal. According to the skin reaction grading standard in the "Technical Specifications for Cosmetics Safety" (2015 Edition) as shown in Table 2, the results were recorded.

[0138] Table 2 "Technical Specifications for Cosmetics Safety" (2015 Edition)

[0139]

[0140] Table 3 Patch test results

[0141]

[0142]

[0143] Test results: As shown in Table 3, 32 subjects with sensitive skin applied Examples 1-6. At 0.5, 24, and 48 hours after removing the patch, the subject scoring grades were all 0. When applying Comparative Example 1, at 0.5 hour after removing the patch, 5 subjects had a Grade 1 reaction; at 24 and 48 hours after removing the patch, the scoring grades of 32 subjects were 0. When applying Comparative Example 2, at 0.5 hour after removing the patch, 3 subjects had a Grade 1 reaction; at 24 hours after removing the patch, 1 subject still had a slight Grade 1 reaction, and the scoring grades of 31 subjects were 0; at 48 hours after removing the patch, the scoring grades of 32 subjects were 0. In summary, the sunscreen provided by this patent is safe and mild, and has no obvious negative impact on the skin, even sensitive skin.

[0144] Test Example 3 Evaluation of Consumer Sensory Effects

[0145] Ninety female volunteers with normal skin conditions aged between 25 and 50 years were selected as the test subjects and randomly divided into 9 groups with 10 people in each group. Test method: The test subjects used the sunscreens of Examples 1-6 and Comparative Examples 3-5 respectively, as well as 1 W / O commercial product (commercial product starting with A) claiming to have a refreshing skin feel, at least once a day for one week. Record the skin feel experience and the willingness to continue using. The skin feel preference is divided into three levels: dislike, average, like, and the number of people corresponding to the levels is recorded in Table 4. The willingness to continue using is divided into two levels: unwilling, willing, and the number of people corresponding to the levels is recorded in Table 5. The oiliness of the product is rated from 1 to 5 points, where 1 point indicates very heavy oiliness, 2 points indicates heavy oiliness, 3 points indicates average oiliness, 4 points indicates light oiliness, and 5 points indicates very light oiliness, and the number of people corresponding to the levels is recorded in Table 6, specifically as follows:

[0146] Table 4 Test Results of Skin Feel Preference

[0147] Test Group Dislike Average Like Example 1 1 2 7 Example 2 2 2 6 Example 3 1 1 8 Example 4 2 1 7 Example 5 0 2 8 Example 6 1 2 7 Comparative Example 3 3 5 2 Comparative Example 4 3 2 5 Comparative Example 5 5 3 2 W / O Commercial Product 3 1 6

[0148] Table 5 Survey Results of the Willingness to Continue Using

[0149] Test Group Unwilling Willing Example 1 1 9 Example 2 4 6 Example 3 1 9 Example 4 2 8 Example 5 2 8 Example 6 3 7 Comparative Example 3 7 3 Comparative Example 4 5 5 Comparative Example 5 7 3 W / O Commercial Product 4 6

[0150] Table 6 Survey Results of Product Oiliness

[0151] Test Group 1 point 2 points 3 points 4 points 5 points Example 1 0 0 2 4 4 Example 2 0 0 3 5 2 Example 3 0 0 3 2 5 Example 4 0 1 3 2 4 Example 5 0 0 1 6 3 Example 6 0 1 3 3 3 Comparative Example 3 0 2 3 3 2 Comparative Example 4 0 0 3 4 3 Comparative Example 5 0 2 5 2 0 w / o Commercial Product 1 2 3 3 1

[0152] As can be seen from Table 4-6, the consumer preference for Examples 1-6 is relatively high, while that for Comparative Examples 3-5 is relatively low; in terms of the willingness to continue using, the willingness to continue using in Comparative Examples 3-5 is more inclined to be unwilling. For the oiliness of the product, the commercially available products, as a W / O system, have the characteristic of heavy oiliness inherent in the system. Although the comparative examples are O / W systems, ethylhexyl methoxycinnamate is used in the formula. Whether it is the oiliness of this oil itself or the visual oiliness brought by its high refractive index, it is easy for the subjects to feel heavy oiliness. Thus, it can be seen that the sunscreen milk involved in this patent has good skin feel, the characteristic of light oiliness, and a relatively high consumer willingness to continue using.

[0153] Test Example 4 Antiseptic Performance Test

[0154] Detection method: Refer to the microbial antiseptic efficacy test in USP32 《51》 of the United States Pharmacopeia

[0155] Staphylococcus aureus (ATCC 6538), Escherichia coli (ATCC 8739), Pseudomonas aeruginosa (ATCC 9027), and Aspergillus niger (ATCC 16404) with the specified standard numbers are inoculated into the sample, and then the survival numbers of each bacterium are checked separately on the 7th day, 14th day, and 28th day. The fewer the survival numbers, the better the antibacterial effect of the preservative.

[0156] Bacteria: Staphylococcus aureus (ATCC 6538), Escherichia coli (ATCC 8739), Pseudomonas aeruginosa (ATCC 9027)

[0157] Molds and yeasts: Aspergillus niger

[0158] Standard requirements:

[0159] For the first inoculation, if the detection of bacteria or molds > 10 CFU / g on the 7th day, the antiseptic challenge fails.

[0160] For the first inoculation, if the detection on the 14th day shows bacteria < 1000 CFU / g and molds < 100 CFU / g, the antiseptic challenge passes; otherwise, it fails.

[0161] On the 14th day of the second inoculation, if the detected survival number of the sample bacteria is reduced to 0.1% of the initial concentration, the antiseptic challenge passes; otherwise, it fails.

[0162] Table 7 Analysis and Test Results of Antiseptic Challenge

[0163]

[0164]

[0165] It can be seen from the above test results that the sunscreen prepared in Example 1 of this application has better anti-corrosion and antibacterial effects, while replacing the ultraviolet scattering agent with titanium dioxide and triethoxysilane octyl results in unqualified anti-corrosion and antibacterial effects.

[0166] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A sunscreen lotion that is mild, non-irritating and improves skin feel, characterized in that, Composed of the following components by mass percentage: Among them, the particle size of the ultraviolet scattering agent is 15 - 50 nm.

2. A sunscreen lotion that is mild, non-irritating and improves skin feel, characterized in that, Composed of the following components by mass percentage: Among them, the particle size of the ultraviolet scattering agent is 15 - 50 nm.

3. A sunscreen lotion that is mild, non-irritating and improves skin feel, characterized in that, Composed of the following components by mass percentage: Among them, the particle size of the ultraviolet scattering agent is 15 - 50 nm.

4. A sunscreen lotion that is mild, non-irritating and improves skin feel, characterized in that, Composed of the following components by mass percentage: Among them, the particle size of the ultraviolet scattering agent is 15 - 50 nm.

5. A sunscreen lotion that is mild, non-irritating and improves skin feel, characterized in that, Composed of the following components by mass percentage: Among them, the particle size of the ultraviolet scattering agent is 15 - 50 nm.

6. A sunscreen lotion that is mild, non-irritating and enhances the skin feel, characterized in that, Composed of the following components by mass percentage: Among them, the particle size of the ultraviolet scattering agent is 15 - 50 nm.

7. The preparation method of the sunscreen milk according to any one of claims 1-6, characterized in that, Including the following steps: (1) Put water, humectant, chelating agent, thickening agent, and emulsifier into the emulsifying pot. After heating, start stirring and homogenizing until the system is fully dispersed, swollen, and dissolved evenly to obtain Phase A; (2) Put the ultraviolet scattering agent, part of the dispersant, and emollient into the oil phase pot and homogenize and disperse until completely uniform to obtain Phase B; (3) Put the ultraviolet absorber, antioxidant, and the remaining dispersant into a stainless steel bucket, heat and stir until completely dissolved and uniform, and then cool down to obtain Phase C; (4) Put Phase C into the oil phase pot and mix it fully with Phase B; (5) Pump the mixture of Phases B and C in the oil pot into the emulsifying pot and mix it with Phase A, homogenize and stir until the system is fully emulsified and uniform, and then evacuate to remove bubbles to obtain the sunscreen milk; The heating temperature in step (1) is 45 - 75 °C, the stirring rate is 80% - 100% of the rate range, and the homogenizing rate is 90 - 100% of the rate range; The heating temperature in step (3) is 60 - 90 °C; The emulsifying temperature in step (5) is 25 - 65 °C, the stirring rate is 80% - 100% of the rate range, and the homogenizing rate is 90 - 100% of the rate range.

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