Sunscreen lotion capable of being used for sensitive skin and easy to wash off and preparation method of sunscreen lotion

Abstract

The invention relates to a sunscreen lotion capable of being used for sensitive skin and easy to wash and a preparation method of the sunscreen lotion. The sunscreen lotion capable of being used for sensitive skin and easy to wash is prepared from the following raw materials: a solvent, a sunscreen agent, an emulsifying agent, a humectant and a thickening agent, the emulsifying agent is a combination of cetearyl alcohol olivate, sorbitan olivate and sodium stearoyl lactylate. The sunscreen product provided by the invention adopts the liquid crystal type emulsifier with skin moisturizing and protecting properties, is not added with a film-forming agent component, still has excellent skin affinity, ductility, smoothness and refreshing feeling, can be easily cleaned with water, has skin moisture retention capability, protects a skin barrier from being damaged easily, and has the advantages of simple preparation process and low cost. The composition is very mild and is suitable for children or people with sensitive skin.

Description

Technical Field

[0001] The present invention belongs to the technical field of cosmetics, and relates to a sunscreen lotion and a preparation method thereof, and specifically relates to a sunscreen lotion which is suitable for sensitive skin, easy to wash and remove, has excellent sunscreen effect, is mild and non-irritating, and a preparation method thereof. Background Art

[0002] As people's awareness of sun protection increases, sunscreen products have gradually become a "must-have", and as people pay more and more attention to the ecological environment and health, the ease of use, mildness and safety of sunscreen products have attracted much attention. For ordinary sunscreen products on the market, people tend to use makeup removers and cleansing products with strong cleaning power to clean them. The stronger the cleaning power of the product, the stronger the oil removal power. The sebum film on the surface of the skin is one of the important structures of the skin's self-protection barrier. If the oil is thoroughly cleaned every time, not only will the foreign dirt be completely removed, but the sebum film will also be completely removed. If this continues for a long time, whether it is healthy skin or sensitive skin, adults or children, it will induce or aggravate skin barrier damage.

[0003] Since children's skin has different physiological characteristics from those of adults, its structure, composition and function are significantly different from those of adults. The thickness of children's stratum corneum and epidermis is significantly lower than that of adults, the hydration capacity of the skin is still imperfect, the pigment layer of the skin is thin and the barrier function is low, and the ability to resist external stimuli and ultraviolet rays is poor. These characteristics make them more prone to various skin problems, and this is also true for people with sensitive skin. Therefore, it is very necessary to develop a sunscreen product that can be suitable for sensitive skin or children's skin, that is, it is very necessary to provide a mild sunscreen lotion that is easy to wash and has excellent sun protection effect. Summary of the invention

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a sunscreen lotion and a method for preparing the same, specifically to provide a sunscreen lotion that can be used on sensitive skin and is easy to wash off, has excellent sun protection effects, is mild and non-irritating, and a method for preparing the same.

[0005] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a sunscreen lotion that is suitable for sensitive skin and easy to wash off. The raw materials for preparing the sunscreen lotion that is suitable for sensitive skin and easy to wash off include: a solvent, a sunscreen, an emulsifier, a moisturizer, and a thickener; the emulsifier is a combination of cetearyl olivate, sorbitan olivate, and sodium stearoyl lactylate.

[0007] The sunscreen lotion involved in the present invention is a sunscreen product with streamlined components. In order to make the sunscreen products disclosed in the prior art have better ductility and skin affinity on the skin, film-forming agents are often added to the formula. However, these film-forming agents cannot be completely washed off with water and must be cleaned with the help of makeup removers and cleansing products with strong cleaning power. This often leads to unstable skin conditions, such as acne, closed comedones, rough and dull skin, etc., and is not suitable for sensitive skin and children's delicate skin.

[0008] The invention develops and designs a specific emulsifier formula for the sunscreen product. The emulsifier is a liquid crystal type composite emulsifier, which can make the system present a multi-layer liquid crystal structure. A large amount of bound water is contained between the layers and is wrapped in the multi-layer structure. The bound water is not easy to evaporate and can enhance skin hydration. The multi-layer liquid crystal structure is similar to the cytoplasmic lipids of the stratum corneum, has a strong affinity with the skin, is adsorbed on the skin to form a protective layer, and has a good closing effect. The compact and delicate layered structure extends on the skin, so the ductility problem of the sunscreen can be solved. When the sunscreen is applied, the layers are easy to slide against each other, the friction is greatly reduced, and a unique smooth feeling is produced; at the same time, the sunscreen is refreshing and non-greasy.

[0009] The three components of the composite emulsifier, namely, cetearyl olivate, sorbitan olivate and sodium stearoyl lactylate, cooperate with each other and synergize in the above-mentioned effects. Therefore, the sunscreen product of the present invention still has excellent skin affinity, ductility, smoothness and refreshing feeling without adding film-forming agent ingredients, and can be easily washed with water. The sunscreen product has the ability to retain skin moisture, protects the skin barrier from being easily damaged, is very mild, and is suitable for children or people with sensitive skin.

[0010] Preferably, the raw materials for preparing the sunscreen lotion that is suitable for sensitive skin and easy to remove include, by mass percentage, 50-80% solvent, 7-25% sunscreen, 1-10% emulsifier, 3-15% moisturizer, and 0.1-1.5% thickener.

[0011] The mass percentage of the solvent can be 50%, 53%, 57%, 60%, 63%, 67%, 70%, 73%, 75%, 80%, etc.; the mass percentage of the sunscreen can be 7%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, etc.; the mass percentage of the emulsifier can be 1%, 3%, 5%, 7%, 10%, etc.; the mass percentage of the moisturizer can be 3%, 5%, 7%, 9%, 12%, 15%, etc.; the mass percentage of the thickener can be 0.1%, 0.4%, 0.6%, 0.9%, 1.2%, 1.5%, etc.; other specific point values ​​within the above numerical ranges can be selected, and they will not be repeated here.

[0012] Preferably, the mass ratio of the cetearyl olivate, sorbitan olivate and sodium stearoyl lactylate is (0.5-5):(0.3-3):(0.1-1), wherein the specific point value in (0.5-5) can be selected from 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 5, etc.; the specific point value in (0.3-3) can be selected from 0.3, 1, 1.5, 2, 2.5, 3, etc.; the specific point value in (0.1-1) can be selected from 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 1, etc.; other specific point values ​​within the above numerical ranges can be selected, and they will not be repeated here one by one.

[0013] Based on the potential interaction between cetearyl olivate, sorbitan olivate and sodium stearoyl lactylate, when the three satisfy the above-mentioned specific ratio, they have more excellent effects on the above-mentioned many functions.

[0014] Preferably, the raw materials for preparing the sunscreen include titanium dioxide, a dispersant, a suspension stabilizer and a skin conditioner.

[0015] In order to obtain a better sunscreen effect, most sunscreen products disclosed in the prior art add multiple sunscreens to the formula, but these sunscreens often cannot be completely washed off with water and must be cleaned with the help of makeup removers and cleansing products with strong cleaning power, which often causes skin sensitivity and irritation, and is particularly unsuitable for children or people with sensitive skin. The present invention creatively uses titanium dioxide, dispersants, suspension stabilizers and skin conditioners as raw materials to prepare a uniform and stable microparticle emulsion with sunscreen efficacy, wherein the dispersant can promote the dispersibility of titanium dioxide to improve the sunscreen efficacy of titanium dioxide, the suspension stabilizer can promote the stability of titanium dioxide and also improve the sunscreen efficacy of titanium dioxide, and the skin conditioner can reduce the skin irritation of the sunscreen, so that the sunscreen formula can have excellent sunscreen efficacy even when the amount added is small; and the sunscreen is easier to be washed off with water than titanium dioxide that is free in the system.

[0016] Preferably, the raw materials for preparing the sunscreen agent include, by weight, 5-20 parts of titanium dioxide, 3-20 parts of a dispersant, 0.1-3 parts of a suspension stabilizer, and 0.3-5 parts of a skin conditioner.

[0017] When the raw material components of the sunscreen are used in combination in the above-mentioned specific mass ratio, it is more effective in improving the sunscreen efficacy of titanium dioxide and the water washability of the product.

[0018] The mass fraction of the titanium dioxide can be selected as 5 parts, 6 parts, 7 parts, 9 parts, 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 19 parts, 20 parts, etc.; the mass fraction of the dispersant can be selected as 3 parts, 4 parts, 6 parts, 8 parts, 10 parts, 11 parts, 13 parts, 15 parts, 17 parts, 19 parts, 20 parts, etc.; the mass fraction of the suspension stabilizer can be selected as 0.1 parts, 0.4 parts, 0.8 parts, 1 parts, 1.5 parts, 1.7 parts, 2 parts, 2.3 parts, 2.5 parts, 2.7 parts, 3 parts, etc.; the mass fraction of the skin conditioner can be selected as 0.3 parts, 1 parts, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, etc.; other specific point values ​​within the above numerical ranges can be selected, and they will not be repeated here one by one.

[0019] Preferably, the dispersant includes any one of dicaprylyl carbonate, butyloctanol salicylate, diisopropyl sebacate, C12-15 alcohol benzoate or caprylic / capric triglyceride or a combination of at least two thereof.

[0020] Preferably, the suspension stabilizer includes any one of polyglyceryl-2 triisostearate, tri(ceteareth-4) phosphate, hydroxypropyl methylcellulose, sorbitan isostearate or polyglyceryl-6 stearate, or a combination of at least two thereof.

[0021] Preferably, the skin conditioning agent comprises silica, dimethicone crosspolymer, and a soothing agent.

[0022] The silica and polydimethylsiloxane cross-linked polymer can improve the lubricity of the sunscreen and relieve the irritation of the sunscreen to the skin; the soothing agent can relieve the irritation of the sunscreen to the skin; and the silica, polydimethylsiloxane cross-linked polymer and the soothing agent have a synergistic effect in improving the mildness of the sunscreen product of the present invention.

[0023] Preferably, the skin conditioning agent comprises, by weight, 0.1-3 parts of silica, 0.1-3 parts of polydimethylsiloxane cross-polymer and 0.01-0.1 parts of soothing agent.

[0024] Based on the potential relationship between silica, polydimethylsiloxane cross-polymer and soothing agent, when they meet the above-mentioned specific mass ratio, they have more excellent effects.

[0025] The mass fraction of the silica can be selected as 0.1 parts, 0.3 parts, 0.8 parts, 1 parts, 1.3 parts, 1.7 parts, 2 parts, 2.3 parts, 2.6 parts, 2.8 parts, 3 parts, etc.; the mass fraction of the polydimethylsiloxane cross-linked polymer can be selected as 0.1 parts, 0.3 parts, 0.8 parts, 1 parts, 1.3 parts, 1.7 parts, 2 parts, 2.3 parts, 2.6 parts, 2.8 parts, 3 parts, etc.; the mass fraction of the soothing agent can be selected as 0.01 parts, 0.02 parts, 0.03 parts, 0.04 parts, 0.05 parts, 0.06 parts, 0.07 parts, 0.08 parts, 0.09 parts, 0.1 parts, etc.; other specific point values ​​within the above numerical ranges can be selected, and they will not be repeated here one by one.

[0026] Preferably, the soothing agent comprises any one of bisabolol, sea buckthorn fruit oil, stearyl glycyrrhetinate, avocado butter or ceramide, or a combination of at least two thereof.

[0027] Preferably, the sunscreen is prepared by a preparation method comprising the following steps:

[0028] Mixing titanium dioxide, a dispersant and a suspension stabilizer and stirring to obtain a first mixture; mixing the first mixture with a skin conditioner and grinding them with a grinder to obtain the sunscreen;

[0029] Preferably, the mixing and stirring is carried out at 25-40°C (e.g., 25°C, 30°C, 35°C, 40°C, etc.) for 20-40min (e.g., 20min, 25min, 30min, 35min, 40min, etc.), and the stirring speed is 500-1200rpm (e.g., 500rpm, 800rpm, 1000rpm, 1200rpm, etc.).

[0030] Preferably, the grinding is performed using a grinder for 1-4 times (e.g., 1 time, 2 times, 3 times or 4 times), each time for 5-30 min (e.g., 5 min, 10 min, 15 min, 20 min, 25 min, 30 min, etc.), and the grinding speed is 2000-4000 r / min (e.g., 2000 r / min, 2500 r / min, 3000 r / min, 3500 r / min or 4000 r / min, etc.).

[0031] The sunscreen prepared by the above specific preparation process is a uniform and stable micro-emulsion.

[0032] Preferably, the humectant comprises a polyol, and the polyol is selected from any one or a combination of at least two of 1,2-pentanediol, butylene glycol, octanediol, 1,2-hexanediol, 1,3-propanediol, propylene glycol or glycerol.

[0033] Preferably, the thickener comprises ammonium acryloyldimethyltaurate / VP copolymer and / or xanthan gum.

[0034] Preferably, the raw materials for preparing the sunscreen lotion that is suitable for sensitive skin and easy to remove further include any one of emollients, antioxidants or skin protectants, or a combination of at least two of them.

[0035] Preferably, the raw materials for preparing the sunscreen lotion which is suitable for sensitive skin and easy to remove further include, by mass percentage, any one of 2-12% of emollient, 0.2-0.6% of antioxidant or 0.01-0.1% of skin protectant, or a combination of at least two thereof.

[0036] The mass percentage of the emollient can be selected as 2%, 5%, 8%, 10%, 12%, etc.; the mass percentage of the antioxidant can be selected as 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, etc.; the mass percentage of the skin protectant can be selected as 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.1%, etc.; other specific point values ​​within the above numerical ranges can be selected, and they will not be repeated here.

[0037] Preferably, the emollient comprises cetearyl alcohol and / or isononyl isononanoate.

[0038] Preferably, the antioxidant comprises p-hydroxyacetophenone.

[0039] Preferably, the skin protectant comprises any one of bisabolol, chamomile extract, sodium hyaluronate, Centella asiatica extract or Portulaca oleracea extract, or a combination of at least two thereof.

[0040] In a second aspect, the present invention provides a method for preparing the sunscreen lotion that is suitable for sensitive skin and easy to remove according to the first aspect, the preparation method comprising the following steps:

[0041] (1) mixing water, a thickener and a moisturizer to obtain an aqueous phase mixture; mixing a sunscreen and an emulsifier to obtain an oil phase mixture;

[0042] (2) homogenizing the aqueous phase mixture and the oil phase mixture with an optional emollient to obtain an emulsified product;

[0043] (3) mixing the emulsified product with an optional skin protectant to obtain a sunscreen lotion that is suitable for sensitive skin and easy to wash off.

[0044] The preparation process of the sunscreen lotion suitable for sensitive skin and easy to wash and remove provided by the present invention is simple and easy to operate, is very suitable for large-scale industrial production, and is practical.

[0045] Preferably, the water, thickener and humectant are mixed and homogenized at 90-95° C. (e.g., 90° C., 91° C., 92° C., 93° C., 94° C., 95° C., etc.) for 5-20 min (e.g., 5 min, 8 min, 10 min, 12 min, 15 min, 18 min, 20 min, etc.).

[0046] Preferably, the aqueous phase mixture also contains an antioxidant.

[0047] Preferably, the sunscreen and emulsifier are mixed and homogenized at 78-84°C (e.g., 78°C, 79°C, 80°C, 82°C, 83°C, 84°C, etc.) for 5-20 min (e.g., 5 min, 8 min, 10 min, 12 min, 15 min, 18 min, 20 min, etc.). At the above homogenization temperature, the stability of the prepared sunscreen system is better, and therefore the sunscreen effect is also better.

[0048] Preferably, the mixing and homogenization in step (2) is carried out at 90-95° C. (e.g., 90° C., 91° C., 92° C., 93° C., 94° C., 95° C., etc.) for 5-20 min (e.g., 5 min, 8 min, 10 min, 12 min, 15 min, 18 min, 20 min, etc.). At the above homogenization temperature, the stability of the obtained sunscreen system is better, and therefore the sunscreen effect is also better.

[0049] Preferably, the mixing and homogenizing in step (2) is carried out under a vacuum degree of -0.09 to -0.08 MPa.

[0050] Preferably, the mixing and homogenizing in step (2) is carried out under stirring, and the stirring speed is 2000-4000 rpm (for example, 2000 rpm, 2500 rpm, 3000 rpm, 3500 rpm, 4000 rpm, etc.).

[0051] Preferably, the mixing in step (3) is carried out at 60-65°C (e.g., 60°C, 61°C, 62°C, 63°C, 64°C, 65°C, etc.) for 5-20 min (e.g., 5 min, 8 min, 10 min, 12 min, 15 min, 18 min, 20 min, etc.).

[0052] Preferably, filtering is performed after the mixing in step (3) is completed.

[0053] Compared with the prior art, the present invention has the following beneficial effects:

[0054] The sunscreen lotion involved in the present invention is a sunscreen product with simplified components, wherein the emulsifier is a liquid crystal type composite emulsifier, and the three components of cetearyl olivate, sorbitan olivate and sodium stearoyl lactylate cooperate with each other and synergistically enhance the effect, which can make the system present a multi-layer liquid crystal structure, and a large amount of bound water is contained between the layers and is wrapped in the multi-layer structure. The bound water is not easy to evaporate and can enhance the hydration of the skin; the multi-layer liquid crystal structure is similar to the cytoplasmic lipids of the stratum corneum, has a strong affinity with the skin, is adsorbed on the skin to form a protective layer, and has a good closing effect; its compact and delicate layered structure extends on the skin, so it can solve the ductility problem of the sunscreen lotion; and when the sunscreen lotion is applied, the layers are easy to slide against each other, the friction force is greatly reduced, and a unique smooth feeling is produced; at the same time, the sunscreen lotion is refreshing and non-greasy. Therefore, the sunscreen product involved in the present invention still has excellent skin affinity, ductility, smoothness and refreshing feeling without adding film-forming agent ingredients, and can be easily washed off with clean water. The sunscreen product has the ability to retain skin moisture and protect the skin barrier from being easily damaged. It is very gentle and suitable for use in children or people with sensitive skin. DETAILED DESCRIPTION

[0055] In order to further explain the technical means and effects adopted by the present invention, the technical solution of the present invention is further described below in conjunction with the preferred embodiments of the present invention, but the present invention is not limited to the scope of the embodiments.

[0056] The sources of some raw materials involved in the following examples and comparative examples are as follows:

[0057] Polydimethylsiloxane cross-linked polymer is a product purchased from SiCare 99;

[0058] Cetearyl olive oil ester is a product purchased from Hallstar with the model number OLIVEM;

[0059] Sorbitan olivate was purchased from Hallstar under the model number OLIVEM 900;

[0060] Sodium stearoyl lactylate was purchased from Palsgaard under the model number Einar 4933;

[0061] Ammonium acryloyldimethyltaurate / VP copolymer is a product purchased from Clariant under the model number Aristoflex AVC;

[0062] Xanthan gum was purchased from Azelis with the model number of CG LAX-T;

[0063] Cetearyl alcohol was purchased from Deyuan Hi-Tech with model number TECKNO A1618P.

[0064] Preparation Example 1

[0065] This preparation example provides a sunscreen, and its preparation raw materials are: 10 parts of titanium dioxide, 8 parts of dicaprylyl carbonate, 0.6 parts of polyglyceryl-2 triisostearate, 1.5 parts of silica, 0.5 parts of polydimethylsiloxane crosspolymer, and 0.05 parts of bisabolol.

[0066] The preparation process is as follows: titanium dioxide, dicaprylyl carbonate and polyglyceryl-2 triisostearate are mixed and stirred at 35°C for 30 minutes at a stirring speed of 700 rpm to obtain a first mixture; silica, polydimethylsiloxane cross-linked polymer and bisabolol are added to the first mixture, mixed, and ground twice using a three-roll grinder, each time for 10 minutes, at a grinding speed of 3000 r / min, to obtain a stable and uniform sunscreen.

[0067] Preparation Example 2

[0068] This preparation example provides a sunscreen, and its preparation raw materials are: 9 parts of titanium dioxide, 9 parts of C12-15 alcohol benzoate, 0.7 parts of polyglyceryl-6 stearate, 1.2 parts of silica, 0.6 parts of polydimethylsiloxane crosspolymer, and 0.06 parts of bisabolol.

[0069] The preparation process is as follows: titanium dioxide, C12-15 alcohol benzoate and polyglyceryl-6 stearate are mixed and stirred at 30°C for 40 minutes at a stirring speed of 900 rpm to obtain a first mixture; silica, polydimethylsiloxane cross-linked polymer and bisabolol are added to the first mixture, mixed, and ground twice using a three-roll grinder, each time for 10 minutes, at a grinding speed of 3000 r / min, to obtain a stable and uniform sunscreen.

[0070] Preparation Example 3

[0071] This preparation example provides a sunscreen, the preparation raw materials of which differ from those of Preparation Example 1 only in the lack of dicaprylyl carbonate, the reduced amount of which is supplemented by polyglyceryl-2 triisostearate, and the other components and contents remain unchanged.

[0072] Preparation Example 4

[0073] This preparation example provides a sunscreen, the preparation raw materials of which differ from those of Preparation Example 1 only in the lack of polyglyceryl-2 triisostearate, the reduced amount of which is supplemented by dicaprylyl carbonate, and the other components and contents remain unchanged.

[0074] Preparation Example 5

[0075] This preparation example provides a sunscreen, the raw materials of which differ from those of Preparation Example 1 only in the lack of silica, the reduced amount of which is supplemented by polydimethylsiloxane cross-linked polymer, and the other components and contents remain unchanged.

[0076] Preparation Example 6

[0077] This preparation example provides a sunscreen, the raw materials of which differ from those of Preparation Example 1 only in that polydimethylsiloxane cross-linked polymer is missing, the reduced amount of which is supplemented by silica, and the other components and contents remain unchanged.

[0078] Example 1

[0079] This embodiment provides a sunscreen lotion product, and the raw materials for its preparation are shown in the following table:

[0080]

[0081] The preparation method is as follows:

[0082] (1) Disperse the moisturizer, antioxidant and thickener evenly at 25° C. and set aside;

[0083] (2) Add water to the water phase pot, start stirring at 40 rpm, add the product of step (1), heat to 90°C, and keep warm for 10 minutes until it is completely dissolved;

[0084] (3) Add sunscreen, emollient, and emulsifier to the oil phase pot in sequence, heat to 82° C., and stir to dissolve completely and evenly;

[0085] (4) Maintain the main pot at 95°C, open the vacuum at -0.09 MPa, pump half of the water phase pot material into the main pot, start stirring at 40 rpm, then pump the oil phase pot material into the main pot, and finally pump the remaining water phase pot material into the main pot, maintain the vacuum at -0.09 MPa, reduce the stirring speed to 20 rpm, start the homogenizer at 2800 rpm, homogenize for 6 minutes, resume stirring at 40 rpm after homogenization, keep warm for 10 minutes, and then slowly cool down;

[0086] (5) When the system temperature drops to 65°C, add the skin protectant, stir at this temperature for 10 minutes, and continue stirring to cool down;

[0087] (6) Stir and cool to 38°C, then stop stirring, take samples and test the plate. If the sample is qualified, filter the material with a 100-mesh filter cloth to obtain the product.

[0088] Example 2

[0089] This embodiment provides a sunscreen lotion product, and the raw materials for its preparation are shown in the following table:

[0090]

[0091]

[0092] The preparation method is as follows:

[0093] (1) Disperse the moisturizer, antioxidant and thickener evenly at 30° C. and set aside;

[0094] (2) Add water to the water phase pot, start stirring at 30 rpm, add the product of step (1), heat to 95°C, and keep warm for 15 minutes until it is completely dissolved;

[0095] (3) Add sunscreen, emollient, and emulsifier to the oil phase pot in sequence, heat to 80° C., and stir until completely dissolved;

[0096] (4) Maintain the main pot at 90°C, open the vacuum at -0.08MPa, pump half of the water phase pot material into the main pot, start stirring at 30rpm, then pump the oil phase pot material into the main pot, and finally pump the remaining water phase pot material into the main pot, maintain the vacuum at -0.08MPa, reduce the stirring speed to 10rpm, start the homogenizer at 3000rpm, homogenize for 10min, resume stirring at 30rpm after homogenization, keep warm for 15min, and then slowly cool down;

[0097] (5) When the system temperature drops to 60°C, add the skin protectant, stir at this temperature for 15 minutes, and continue stirring to cool down;

[0098] (6) Stir and cool to 35°C and then stop stirring. Take samples for plate testing. If they are qualified, filter the material with a 100-mesh filter cloth to obtain the product.

[0099] Embodiment 3-6

[0100] This example provides four sunscreen lotion products, the raw materials of which differ from those of Example 1 only in that the sunscreen prepared in Example 1 is replaced by the sunscreen prepared in Examples 3-6 in equal amounts, and the other components and contents remain unchanged. The preparation method thereof is the same as that of Example 1.

[0101] Example 7

[0102] This embodiment provides a sunscreen lotion product, the raw materials of which are different from those of Example 1 in that the sunscreen prepared in Example 1 is replaced with a single component of titanium dioxide (the content of titanium dioxide remains the same as in Example 1), and other components and contents remain unchanged. The preparation method thereof is the same as in Example 1.

[0103] Example 8

[0104] This embodiment provides a sunscreen lotion product, the raw materials of which are different from those of Example 1 only in the ratio of the components in the emulsifier, 0.5% of cetearyl olivate, 2% of sorbitan olivate, and 2% of sodium stearoyl lactylate, and the other components and their contents remain unchanged. The preparation method thereof is referred to Example 1.

[0105] Example 9

[0106] This embodiment provides a sunscreen product, the raw materials of which are different from those of Example 1 only in the ratio of the components in the emulsifier, 2% of cetearyl olivate, 0.5% of sorbitan olivate, 2% of sodium stearoyl lactylate, and the other components and their contents remain unchanged. The preparation method thereof is referred to Example 1.

[0107] Example 10

[0108] This embodiment provides a sunscreen product, the raw materials for its preparation are the same as those in Example 1, and the difference between the preparation method and Example 1 is that in step (4), the main pot is kept at 85° C., and other conditions remain unchanged.

[0109] Comparative Example 1

[0110] This comparative example provides a sunscreen product, the raw materials of which differ from those of Example 1 only in the formula of the emulsifier, the emulsifier lacks cetearyl olivate, and the reduced amount thereof is proportionally distributed to the mass of sorbitan olivate and sodium stearoyl lactylate, and the other components and contents remain unchanged. The preparation method thereof refers to Example 1.

[0111] Comparative Example 2

[0112] This comparative example provides a sunscreen product, the raw materials of which differ from those of Example 1 only in the formula of the emulsifier, the emulsifier lacks sorbitan olivate, and the reduced amount thereof is proportionally distributed to the mass of cetearyl olivate and sodium stearoyl lactylate, and the other components and contents remain unchanged. The preparation method thereof refers to Example 1.

[0113] Comparative Example 3

[0114] This comparative example provides a sunscreen product, the raw materials of which differ from those of Example 1 only in the formula of the emulsifier, the emulsifier lacks sodium stearoyl lactylate, and the reduced amount thereof is proportionally distributed to the mass of cetearyl olive oil ester and sorbitan olive oil ester, and the other components and contents remain unchanged. The preparation method thereof refers to Example 1.

[0115] Test Example 1

[0116] Sunscreen effect evaluation test:

[0117] (1) Determination of Sun Protection Factor (SPF value)

[0118] The sun protection index of the products prepared in Examples 1-10 and Comparative Examples 1-3 was measured according to the method for measuring the sun protection index (SPF value) of sunscreen cosmetics in the "Technical Specifications for Safety of Cosmetics 2015 Edition".

[0119] The specific measurement method is as follows: Reference substance: SPF value 16.1±2.4, prepared according to the standard formula of medium and high SPF standard product (P2) in the "Technical Specifications for Safety of Cosmetics" (2015 edition).

[0120] Subjects: A total of 130 subjects were divided into 13 groups, with 4 males and 6 females in each group, aged 24 to 52 years old, with an average age of 35.4±10.0 years old, meeting the voluntary inclusion criteria.

[0121] Light source: Daylight simulator xenon arc lamp, all performance indicators meet the measurement specification requirements.

[0122] Test method: Test in accordance with the specific requirements of the "Technical Specifications for Safety of Cosmetics" (2015 edition). The subject lies prone and the back is irradiated. The minimum erythema dose (MED value) of the subject's skin to ultraviolet radiation is predicted 24 hours before the test, and the ultraviolet radiation dose is adjusted according to the predicted results for testing the test object. On the day of the test, a spot no less than 30 cm is selected on the subject's back. 2 Normal skin area, (2.00±0.05)mg / cm 2 The test object or reference substance is evenly applied to the above-mentioned area with the dosage of 100 mg / kg. Then the irradiation dose is selected according to the specification requirements, and irradiation is performed in three conditions: ① The test object is not applied to the subject's skin; ② The reference substance is applied; ③ The test object is applied. Observe the experimental results after 24 hours and record the MED values ​​in the three conditions respectively.

[0123] SPF value calculation method: The SPF value of the test object or reference product protecting a single subject is expressed as follows:

[0124]

[0125] The individual SPF value is required to be accurate to one decimal place. The arithmetic mean of the SPF values ​​of all subjects protected by the measured object is calculated, and the integer part is the SPF value of the measured sample. The sampling error of the estimated mean can be used to calculate the standard deviation and standard error of the data set. The 95% confidence interval (95% CI) of the mean is required to not exceed 17% of the mean, otherwise the number of subjects should be increased (not more than 25) until the above requirements are met.

[0126] The results are shown in Table 1.

[0127] (2) Determination of UV protection index (PFA value)

[0128] According to the method for determining the long-wave ultraviolet protection index (PFA value) of sunscreen cosmetics in the "Technical Specifications for Safety of Cosmetics 2015 Edition", the sun protection index of the products prepared in Examples 1-10 and Comparative Examples 1-3 was determined.

[0129] The specific determination method is: Reference substance: PFA value 4.4±0.6, prepared according to the standard formula of PFA determination standard substance in the "Technical Specifications for Safety of Cosmetics" (2015 edition).

[0130] Subjects: Same batch as (1).

[0131] Light source: Daylight simulator xenon arc lamp, all performance indicators meet the measurement specification requirements.

[0132] Test method: Test in accordance with the specific requirements of the "Technical Specifications for Safety of Cosmetics" (2015 edition). The subject lies prone and the back is exposed to the radiation. The minimum amount of darkening of the subject's skin to ultraviolet radiation (MPPD value) is predicted 24 hours before the test, and the amount of ultraviolet radiation is adjusted according to the predicted results for testing the test object. The test first selects a spot no less than 30cm on the subject's back. 2 For normal skin area, apply the test object or reference product evenly on the above area at a dosage of (2.00±0.05) mg / cm; then select the UVA exposure amount according to the specification requirements, and irradiate in three conditions: ① No test object applied to the subject's skin; ② Apply reference product; ③ Apply test object. Observe the experimental results after 4 hours, and record the MPPD values ​​in the three conditions respectively.

[0133] PFA value calculation method: The PFA value of the test substance or reference substance protecting a single subject is expressed as follows:

[0134]

[0135] The results are shown in Table 1.

[0136] Table 1

[0137] Group SPF value PFA value Example 1 24 3.4 Example 2 23 3.3 Example 3 19 2.9 Example 4 18 2.7 Example 5 22 3.2 Example 6 23 3.1 Example 7 17 2.5 Example 8 22 3.1 Example 9 20 3.0 Example 10 16 2.2 Comparative Example 1 21 3.0 Comparative Example 2 20 3.1 Comparative Example 3 20 3.0

[0138] It can be seen from the data in Table 1 that the sunscreen lotion involved in the present invention has an excellent sunscreen effect, and compared with Examples 3-4, 7, and 10, Examples 1, 2, 5, 6, and 8-9 have a better sunscreen effect, which indicates that the lack of dispersants and suspension stabilizers in the sunscreen has a certain influence on the sunscreen effect, and the preparation process parameters of the sunscreen also have a certain influence on the sunscreen effect.

[0139] Test Example 2

[0140] Irritation evaluation test:

[0141] With reference to the "Cosmetic Hygiene Standards", human skin patch tests were conducted on the products prepared in Examples 1-10 and Comparative Examples 1-3. 130 volunteers aged 18-60 who were healthy and free of allergic diseases were selected as subjects. The subjects were divided into 13 groups, with 10 people in each group. Other skin care products could not be used during the test. A patch tester with an area of ​​6mm×6mm was selected, and the test substance was placed in the small chamber of the patch tester. The dosage was 0.025g. The patch tester with the test substance was applied to the back of the subject with a low-allergenic tape, and the palm of the hand was gently pressed to evenly apply it to the skin for 24 hours. The skin reaction was observed according to the standards shown in Table 2 30 minutes (after the indentation disappears), 24 hours and 48 hours after the removal of the test substance patch tester, and the observation results were recorded. The safety test results are shown in Table 3.

[0142] Table 2

[0143]

[0144] Table 3

[0145]

[0146]

[0147] From the data in Table 3, it can be seen that compared with Comparative Examples 1-3, the mildness of the Examples is better, indicating that the three components of cetearyl olivate, sorbitan olivate and sodium stearoyl lactylate cooperate with each other and synergize to improve the mildness of the product. Among them, Examples 1-4 and 7-10 are more mild, and Examples 5-6 have weak erythema, indicating that the formula of the skin conditioner also affects the irritation of the product to the skin to a certain extent.

[0148] Test Example 3

[0149] Stability test:

[0150] (4.1) Heat resistance test: The products prepared in Examples 1-10 and Comparative Examples 1-3 were placed in a thermostat at a constant temperature of 45±1°C for 24 hours, taken out, and visually observed after returning to room temperature (25°C). A small amount of the sample was applied on the back of the hand to observe its performance;

[0151] (4.2) Cold resistance test: The products prepared in Examples 1-10 and Comparative Examples 1-3 were placed in a thermostat at a constant temperature of -10°C for 24 hours, taken out, and after returning to room temperature (25°C), a small amount of the sample was applied on the back of the hand to observe its performance;

[0152] The experimental results are shown in Table 4:

[0153] Table 4

[0154] Group Heat resistance test Cold resistance test Example 1 Stable, no abnormality Stable, no abnormality Example 2 Stable, no abnormality Stable, no abnormality Example 3 Stable, no abnormality Stable, no abnormality Example 4 Stable, no abnormality Stable, no abnormality Example 5 Stable, no abnormality Stable, no abnormality Example 6 Stable, no abnormality Stable, no abnormality Example 7 Stable, no abnormality Stable, no abnormality Example 8 Stable, no abnormality Stable, no abnormality Example 9 Stable, no abnormality Stable, no abnormality Example 10 Unstable, stratified Stable, no abnormality Comparative Example 1 Unstable, stratified Unstable, stratified Comparative Example 2 Unstable, stratified Unstable, stratified Comparative Example 3 Unstable, stratified Unstable, stratified

[0155] From the data in Table 4, it can be seen that Examples 1-9 have excellent stability, while Example 10 becomes heat-resistant and unstable due to the change in emulsification temperature; Comparative Examples 1-3 cause stratification of the material due to the replacement of the emulsifier. It can be concluded that the emulsifier and the emulsification temperature have a greater impact on the stability of the present invention.

[0156] Test Example 4

[0157] Consumer sensory evaluation:

[0158] The products prepared in Examples 1-10 and Comparative Examples 1-3 were evaluated for their sensory effects: 130 female volunteers aged 20-40 with healthy facial skin were selected as subjects, with 10 people in each group. The same amount of products in each group were evenly applied on the faces of the subjects once a day for 60 consecutive days. After 60 days, the subjects evaluated the smoothness and refreshing feeling of the products. The evaluation results were divided into 3 levels, namely, good effect, general effect, and no effect. The results are shown in Tables 5-6:

[0159] Table 5

[0160] Smooth feeling Better effect (people) Average effect (people) No effect (people) Example 1 10 0 0 Example 2 10 0 0 Example 3 10 0 0 Example 4 10 0 0 Example 5 8 1 1 Example 6 7 3 0 Example 7 10 0 0 Example 8 7 3 0 Example 9 7 2 1 Example 10 6 3 1 Comparative Example 1 2 5 3 Comparative Example 2 1 4 5 Comparative Example 3 0 3 7

[0161] Table 6

[0162]

[0163]

[0164] It can be seen from the data in Tables 5 and 6 that the emulsifier, silica and polydimethylsiloxane cross-linked polymer used in the present invention can improve the lubricity of the sunscreen agent and the smoothness of the sunscreen product; and the sunscreen product prepared with the selected emulsifier has a good skin feel, a high degree of freshness, and is not greasy or thick.

[0165] Test Example 5

[0166] Moisture test:

[0167] 130 subjects were selected, 10 in each group. The subjects first washed their forearms and sat quietly for 30 minutes in a constant temperature and humidity environment (25°C, RH43%), and then divided the left and right arms of the subjects into regions, each region was 3cm×3cm, and the skin moisture content before using the product was tested with a Corneometer CM825 instrument as a control; then 18 mg of the samples of Examples 1-10 and Comparative Examples 1-3 were applied respectively until completely absorbed, and then the skin moisture content of each group of products was tested immediately after use and 8 hours after use, and then the average value of the skin moisture content growth rate (%) after immediate use and the skin moisture content growth rate (%) after 8 hours was calculated, and the data was recorded as shown in Table 7:

[0168] Table 7

[0169]

[0170] From the data in Table 7, it can be seen that Examples 1-7 have excellent instant moisturizing and continuous water-locking effects; Examples 8-10 have slightly weaker effects, but also have good skin moisturizing effects, while the instant moisturizing ability and continuous water-locking effects of Comparative Examples 1-3 are not ideal.

[0171] Test Example 6

[0172] Clean water washable test:

[0173] This study adopts the self-control method to evaluate the sensory effects of the products prepared in Examples 1-10 and Comparative Examples 1-3: 130 female volunteers aged 20-40 years old with healthy facial skin were selected as subjects, with 10 people in each group. The subjects washed their faces with cleaning products and wiped their skin with dry facial tissues. They sat in a laboratory with a temperature of 21°C ± 1°C and a humidity of 50% RH ± 10% RH for 20 minutes, took an appropriate amount of product and evenly applied it on the face. After waiting for 30 minutes, the left face was washed with a cleansing towel and the right face was washed with a cleansing towel after cleansing oil. A questionnaire survey was then used to evaluate whether the cleansing ability of the product with cleansing oil was equivalent to that of the cleansing oil. The evaluation results were divided into 3 levels, namely, good cleaning effect, general, and no effect. The results are shown in Table 8:

[0174] Table 8

[0175]

[0176]

[0177] From the data in Table 8, it can be seen that the cleansing effect of Examples 1 / 2 / 5 / 6 is comparable to that of cleansing oil, which is a good effect; while the cleansing effect of Examples 3 / 4 / 7 / 8 / 9 / 10 is slightly weaker; Comparative Examples 1-3 cannot be washed with water and need to be removed with a cleanser or professional cleansing products.

[0178] The applicant declares that the present invention illustrates the technical solution of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned embodiments, that is, it does not mean that the present invention must rely on the above-mentioned embodiments to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

[0179] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0180] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

Claims

1. A sunscreen lotion that is suitable for sensitive skin and easy to remove, characterized in that: The raw materials for preparing the sunscreen lotion which can be used for sensitive skin and is easy to wash off include: a solvent, a sunscreen, an emulsifier, a moisturizer, and a thickener; the emulsifier is a combination of cetearyl olivate, sorbitan olivate, and sodium stearoyl lactylate.

2. The sunscreen lotion suitable for sensitive skin and easy to remove according to claim 1, characterized in that: The raw materials for preparing the sunscreen lotion which is suitable for sensitive skin and easy to wash off include, by weight percentage, 50-80% of solvent, 7-25% of sunscreen agent, 1-10% of emulsifier, 3-15% of moisturizer, and 0.1-1.5% of thickener; Preferably, the mass ratio of cetearyl olivate, sorbitan olivate and sodium stearoyl lactylate is (0.5-5):(0.3-3):(0.1-1).

3. The sunscreen lotion suitable for sensitive skin and easy to remove according to claim 1, characterized in that: The raw materials for preparing the sunscreen include titanium dioxide, a dispersant, a suspension stabilizer and a skin conditioner; Preferably, the raw materials for preparing the sunscreen agent include 5-20 parts of titanium dioxide, 3-20 parts of dispersant, 0.1-3 parts of suspension stabilizer and 0.3-5 parts of skin conditioner in parts by mass; Preferably, the dispersant includes any one or a combination of at least two of dicaprylyl carbonate, butyloctanol salicylate, diisopropyl sebacate, C12-15 alcohol benzoate or caprylic / capric triglyceride; Preferably, the suspension stabilizer includes any one of polyglyceryl-2 triisostearate, tri(ceteareth-4) phosphate, hydroxypropyl methylcellulose, sorbitan isostearate or polyglyceryl-6 stearate, or a combination of at least two thereof.

4. The sunscreen lotion suitable for sensitive skin and easy to remove according to claim 3, characterized in that: The skin conditioning agent includes silica, dimethicone crosspolymer, and a soothing agent; Preferably, the skin conditioning agent comprises, by weight, 0.1-3 parts of silica, 0.1-3 parts of polydimethylsiloxane cross-polymer, and 0.01-0.1 parts of a soothing agent; Preferably, the soothing agent comprises any one of bisabolol, sea buckthorn fruit oil, stearyl glycyrrhetinate, avocado butter or ceramide, or a combination of at least two thereof.

5. The sunscreen lotion suitable for sensitive skin and easy to remove according to claim 3 or 4, characterized in that: The sunscreen is prepared by a preparation method comprising the following steps: Mixing titanium dioxide, a dispersant and a suspension stabilizer and stirring to obtain a first mixture; mixing the first mixture with a skin conditioner and grinding them with a grinder to obtain the sunscreen; Preferably, the mixing and stirring is carried out at 25-40° C. for 20-40 min, and the stirring speed is 500-1200 rpm; Preferably, the grinding is performed using a grinder for 1-4 times, each time for 5-30 minutes, and the grinding speed is 2000-4000 r / min.

6. The sunscreen lotion suitable for sensitive skin and easy to remove according to any one of claims 1 to 5, characterized in that: The humectant comprises a polyol, and the polyol is selected from any one or a combination of at least two of 1,2-pentanediol, butylene glycol, octanediol, 1,2-hexanediol, 1,3-propanediol, propylene glycol or glycerol; Preferably, the thickener comprises ammonium acryloyldimethyltaurate / VP copolymer and / or xanthan gum.

7. The sunscreen lotion suitable for sensitive skin and easy to remove according to any one of claims 1 to 6, characterized in that: The raw materials for preparing the sunscreen lotion which is suitable for sensitive skin and easy to wash off also include any one or a combination of at least two of emollients, antioxidants or skin protectants; Preferably, the raw materials for preparing the sunscreen lotion that can be used for sensitive skin and is easy to wash off further include, by weight percentage, any one of 2-12% of an emollient, 0.2-0.6% of an antioxidant, or 0.01-0.1% of a skin protectant, or a combination of at least two thereof; Preferably, the emollient comprises cetearyl alcohol and / or isononyl isononanoate; Preferably, the antioxidant comprises p-hydroxyacetophenone; Preferably, the skin protectant comprises any one of bisabolol, chamomile extract, sodium hyaluronate, Centella asiatica extract or Portulaca oleracea extract, or a combination of at least two thereof.

8. The method for preparing a sunscreen lotion suitable for sensitive skin and easy to remove according to any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: (1) mixing water, a thickener and a moisturizer to obtain an aqueous phase mixture; mixing a sunscreen and an emulsifier to obtain an oil phase mixture; (2) homogenizing the aqueous phase mixture and the oil phase mixture with an optional emollient to obtain an emulsified product; (3) mixing the emulsified product with an optional skin protectant to obtain a sunscreen lotion that is suitable for sensitive skin and easy to wash off.

9. The method for preparing the sunscreen lotion suitable for sensitive skin and easy to remove according to claim 8, characterized in that: The water, thickener and moisturizer are mixed and homogenized at 90-95° C. for 5-20 minutes; Preferably, the aqueous phase mixture also contains an antioxidant; Preferably, the sunscreen and emulsifier are mixed and homogenized at 78-84° C. for 5-20 min.

10. The method for preparing the sunscreen lotion suitable for sensitive skin and easy to remove according to claim 8 or 9, characterized in that: The mixing and homogenization in step (2) is carried out at 90-95° C. for 5-20 min; Preferably, the mixing and homogenizing in step (2) is carried out at a vacuum degree of -0.09 to -0.08 MPa; Preferably, the mixing and homogenizing in step (2) is carried out under stirring at a stirring speed of 2000-4000 rpm; Preferably, the mixing in step (3) is performed at 60-65° C. for 5-20 min; Preferably, filtering is performed after the mixing in step (3) is completed.

Images