Physical sunscreen emulsion and preparation method thereof

Abstract

The invention relates to the technical field of preparation of daily chemical products, and particularly discloses a preparation method of a physical sunscreen emulsion. The physical sunscreen emulsion comprises the following components in percentage by weight: 0-60% of a physical sunscreen agent; 0-10% of a main emulsifier; 0-10% of a co-emulsifier; 0.1 to 10% of a thickening agent; 0-10% of a film-forming agent; 5-30% of a humectant; 0-20% of an emollient; 0-30% of an auxiliary additive; and the balance of water. After the physical sunscreen emulsion is smeared, the whitening phenomenon can be greatly improved, and the skin is more natural after the physical sunscreen emulsion is smeared. In addition, the physical sunscreen emulsion disclosed by the invention has a relatively high sunscreen multiple, and a good sunscreen effect can be achieved for a long time; meanwhile, the sunscreen effect can be kept stable under the condition of sweating or moisture, and the sunscreen mask is more suitable for sunscreen of outdoor sports people.

Description

Technical Field

[0001] The invention relates to the technical field of daily chemical product preparation, and in particular to a method for preparing a physical sunscreen emulsion. Background Art

[0002] Solar energy is one of the important resources for the survival of organisms. Stable solar energy can provide energy, while unstable (too strong or too weak) energy may have a harmful effect on life on Earth. Since the first report of the Antarctic ozone hole in 1985, people have gradually begun to pay attention to the environmental problem of stratospheric ozone depletion. The large-scale loss of ozone in the ozone layer will increase the ultraviolet radiation flux in sunlight, resulting in increasing damage to human skin due to long-term ultraviolet exposure, so sun protection is very important for people.

[0003] In life, more and more people will choose some sunscreen cosmetics to prevent ultraviolet damage to the skin, among which sunscreen is added. Sunscreen uses the principle of reflection, scattering and absorption of ultraviolet rays to achieve ultraviolet protection for the skin, so that sunscreen cosmetics can form a protective layer on the face. Common sunscreens include chemical sunscreens and physical sunscreens. Chemical sunscreens use the conversion between single and double bonds in the molecules of this type of compound to absorb ultraviolet rays that are harmful to the skin, and convert the absorbed ultraviolet energy into energy that is harmless to the skin and emit it. However, because the ultraviolet energy range is relatively wide, a single chemical sunscreen cannot completely resist the damage of ultraviolet rays. It is necessary to match a variety of chemical sunscreens to achieve broad-spectrum protection, and it will also be consumed in the process of sun protection and is easily absorbed by the skin. Physical sunscreens use the effect of reflective nanoparticles such as titanium dioxide on the reflection and scattering of ultraviolet rays to reduce the exposure of ultraviolet rays to the skin. The particles used in physical sunscreen will not be absorbed by the skin, and it is not easy to cause skin inflammation. It is highly safe and can achieve the effect of sun protection as soon as it is applied.

[0004] The inventors discovered in their research that, during the preparation of physical sunscreen lotion, increasing the amount of physical sunscreen added can effectively improve the sunscreen effect of the physical sunscreen lotion; however, due to excessive addition of physical sunscreen, the physical sunscreen lotion may also appear white after application, making the skin appear noticeably white or particularly white, which is extremely unnatural and needs further improvement. Summary of the invention

[0005] In order to overcome at least one of the technical problems existing in the prior art, the present invention firstly provides a method for preparing a physical sunscreen emulsion.

[0006] The technical solution of the present invention is as follows:

[0007] The present invention first provides a physical sunscreen lotion, which comprises the following components in percentage by weight:

[0008] Physical sunscreen 0-60%; primary emulsifier 0-10%; auxiliary emulsifier 0-10%; thickener 0.1-10%; film former 0-10%; moisturizer 5-30%; emollient 0-20%; auxiliary additive 0-30%; the balance is water.

[0009] The inventors have shown in a large number of studies that the whitening phenomenon of physical sunscreen lotions after application is closely related to the selection of the types of physical sunscreens, primary emulsifiers, co-emulsifiers, thickeners, film formers, moisturizers, emollients and auxiliary additives. In a large number of experiments, the inventors screened out a physical sunscreen lotion composed of the specific types of physical sunscreens, primary emulsifiers, co-emulsifiers, thickeners, film formers, moisturizers, emollients and auxiliary additives described in the present invention, which can significantly improve the whitening phenomenon.

[0010] Preferably, the physical sunscreen lotion comprises the following components in percentage by weight:

[0011] Physical sunscreen 20-60%; primary emulsifier 0-5%; auxiliary emulsifier 0-5%; thickener 0.1-5%; film former 0-5%; moisturizer 5-20%; emollient 0-15%; auxiliary additive 0-20%; the balance is water.

[0012] Further preferably, the physical sunscreen lotion comprises the following components in percentage by weight:

[0013] Physical sunscreen 40-60%; primary emulsifier 2-4%; auxiliary emulsifier 2-4%; thickener 0.1-2.5%; film former 0-3%; moisturizer 5-15%; emollient 5-15%; auxiliary additive 0-10%; the balance is water.

[0014] Preferably, the physical sunscreen is selected from one or a mixture of more than one of the following components:

[0015] Titanium Dioxide (and) Triethoxycaprylylsilane (and) Cyclohexasiloxane (and) Cyclopentasiloxane (and) Lauryl Polyglyceryl-3 Polydimethylsiloxyethyl Dimethicone;

[0016] Titanium Dioxide (and) Cyclopentasiloxane (and) Cyclohexasiloxane (and) Lauryl Polyglyceryl-3 Polydimethylsiloxyethyl Dimethicone (and) Triethoxycaprylylsilane;

[0017] Titanium Dioxide (and) Polyquaternium-51 (and) Stearate (and) Aluminum Hydroxide; Titanium Dioxide (and) Triethoxycaprylylsilane;

[0018] CI 77891 (and) Polyquaternium-61 (and) Polyquaternium-65 (and) Triethoxycaprylylsilane (and) Aluminum Hydroxide;

[0019] Zinc Oxide (and) Cyclopentasiloxane (and) Cyclohexasiloxane (and) PEG-10 Dimethicone (and) Lauryl Polyglyceryl-3 Polydimethylsiloxyethyl Dimethicone (and) Triethoxycaprylylsilane;

[0020] Zinc oxide (and) polyquaternium-61 (and) triethoxycaprylylsilane;

[0021] Zinc oxide (and) triethoxycaprylylsilane.

[0022] Preferably, the primary emulsifier is selected from one or a mixture of more than one of the following components:

[0023] From Cetyl PEG / PPG-10 / 1 Dimethicone; PEG-10 Dimethicone; Lauryl PEG-9 Polydimethylsiloxyethyl Dimethicone; Lauryl PEG-10 Tris(Trimethicone)Silylethyl Dimethicone; Cyclopentasiloxane (and) PEG / PPG-18 / 18 Dimethicone; PEG-9 Polydimethylsiloxyethyl Dimethicone.

[0024] Preferably, the co-emulsifier is selected from one or a mixture of more than one of the following components:

[0025] PEG-11 Methyl Ether Dimethicone; Sorbitan Oleate; Sorbitan Sesquioleate; Sorbitan Isostearate; Polyglyceryl-4 Isostearate; Polyglyceryl-2 Triisostearate.

[0026] Preferably, the thickener is selected from one or a mixture of more than one of the following components:

[0027] Disteardimethylammonium hectorite; magnesium stearate; magnesium aluminum silicate; bentonite; trihydroxystearin; hectorite; stearalkonium hectorite; xanthan gum; cellulose gum.

[0028] Preferably, the film-forming agent is selected from one or a mixture of more than one of the following components:

[0029] Pentapolydimethylsiloxane (and) trimethylsiloxysilicate; Polydimethylsiloxane (and) trimethylsiloxysilicate; Trimethylsiloxysilicate (and) C11-13 isoparaffin; Styrene / acrylates copolymer; VP / eicosene copolymer; Triacontyl PVP; VP / eicosene copolymer; Acrylates copolymer.

[0030] Preferably, the moisturizing agent is selected from one or a mixture of more than one of the following components: butylene glycol; propylene glycol; 1,2-hexanediol; trehalose; 1,3-propanediol; glycerol; pentanediol; sorbitol; glycerol.

[0031] Preferably, the emollient is selected from one or more of the following components: isononyl isononanoate; polydimethylsiloxane; C9-12 alkane; caprylyl polymethylsiloxane; cetyl polydimethylsiloxane; cyclopentasiloxane; coconut oil alcohol-caprylate / caprate; caprylic / capric triglyceride; cyclopentasiloxane; cetyl ethylhexanoate; glyceryl tri(ethylhexanoate).

[0032] Preferably, the auxiliary additive is selected from one or more of the following components: polymethylsilsesquioxane; silica; sodium calcium borosilicate, bisabolol; ginger root extract; parahydroxyacetophenone; sodium chloride; polydimethylsiloxane (and) polydimethylsiloxane / vinyl polydimethylsiloxane crosspolymer; knotweed root extract; purslane extract; boron nitride; sodium calcium borosilicate; magnesium chloride.

[0033] The present invention also provides a method for preparing the above physical sunscreen emulsion, which comprises the following steps:

[0034] (1) Take a certain amount of physical sunscreen, thickener, film former, emollient, auxiliary additive, primary emulsifier and co-emulsifier, heat to 60-65° C., and homogenize until uniformly dispersed;

[0035] (2) Take a certain amount of moisturizer, auxiliary additives, and deionized water, heat them to 60-65° C., and stir until they are evenly dispersed;

[0036] (3) Slowly adding the material of step (2) to the material of step (1) under stirring;

[0037] (4) stirring the prepared emulsion material and homogenizing it by using a high-pressure homogenizer until the system emulsion is fully mixed and uniform;

[0038] (5) Stir and cool to prepare a stable sunscreen lotion.

[0039] Beneficial effects: The present invention provides a physical sunscreen lotion with a new composition. The physical sunscreen lotion of the present invention can significantly improve the whitening phenomenon after application, and makes the skin more natural after application.

[0040] In addition, since the physical sunscreen lotion of the present invention contains a relatively high content of sunscreen, the physical sunscreen lotion of the present invention has a relatively high sun protection multiple and can achieve a good sunscreen effect for a long time; at the same time, the sunscreen effect can be kept stable even in sweating or humid conditions, and is more suitable for sun protection for people doing outdoor sports. DETAILED DESCRIPTION

[0041] The content of the present invention can be further understood by combining the following detailed description of the preferred implementation method of the present invention and the embodiments included. Unless otherwise stated, all technical and scientific terms used in this article have the same meaning as those of ordinary skill in the art to which the application belongs. If the definition of a specific term disclosed in the prior art is inconsistent with any definition provided in the application, the term definition provided in the application shall prevail.

[0042] As used herein, unless otherwise explicitly indicated in the context, features that are not limited to the singular or plural form are also intended to include features in the plural form. It should also be understood that, as used herein, the term "prepared by..." is synonymous with "comprising", "including", "including", "having", "including" and / or "comprising", when used in this specification, represents the stated composition, step, method, product or device, but does not exclude the presence or addition of one or more other compositions, steps, methods, products or devices. In addition, when describing the embodiments of the present application, the use of "preferred", "preferably", "more preferably", etc. refers to embodiments of the present invention that may provide certain beneficial effects in certain cases. However, in the same or other cases, other embodiments may also be preferred. In addition, the expression of one or more preferred embodiments does not imply that other embodiments are unavailable, nor is it intended to exclude other embodiments from the scope of the present invention.

[0043] Example 1 Preparation of physical sunscreen lotion

[0044] The physical sunscreen lotion comprises the following raw material components in percentage by weight:

[0045] Physical sunscreen: titanium dioxide (and) triethoxycaprylylsilane (and) cyclohexasiloxane (and) cyclopentasiloxane (and) lauryl polyglyceryl-3 polydimethylsiloxyethyl polydimethylsiloxane 40wt%; zinc oxide (and) cyclopentasiloxane (and) cyclohexasiloxane (and) PEG-10 polydimethylsiloxane (and) lauryl polyglyceryl-3 polydimethylsiloxyethyl polydimethylsiloxane (and) triethoxycaprylylsilane 15wt%;

[0046] Primary emulsifier: cetyl PEG / PPG-10 / 1 dimethicone 3wt%; PEG-10 dimethicone 2wt%;

[0047] Auxiliary emulsifier: polyglyceryl-4 isostearate 1wt%;

[0048] Thickener: disteardimethylammonium hectorite 0.5wt%;

[0049] Film former: cyclopentasiloxane (and) trimethylsiloxysilicate 2wt%;

[0050] Moisturizer: butylene glycol 4wt%; propylene glycol 5wt%; 1,2-hexanediol 0.5wt%; trehalose 0.5wt%;

[0051] Emollient: 3wt% isononyl isononanoate; 2wt% polydimethylsiloxane; 2wt% C9-12 alkane; 2wt% octyl polymethylsiloxane; 1wt% cetyl polydimethylsiloxane;

[0052] Auxiliary additives: polymethylsilsesquioxane 1wt%; silica 0.5wt%; sodium calcium borosilicate 0.5wt%; bisabolol 0.2wt%; ginger root extract 0.1wt%; p-hydroxyacetophenone 0.5wt%; sodium chloride 1wt%;

[0053] The balance is deionized water;

[0054] The preparation method of the physical sunscreen emulsion comprises the following steps:

[0055] (1) Take a certain amount of physical sunscreen, thickener, film former, emollient, auxiliary additive, primary emulsifier and co-emulsifier, heat to 60-65° C., and homogenize until uniformly dispersed;

[0056] (2) Take a certain amount of moisturizer, auxiliary additives, and deionized water, heat them to 60-65° C., and stir until they are evenly dispersed;

[0057] (3) Slowly adding the material of step (2) to the material of step (1) under stirring;

[0058] (4) stirring the prepared emulsion material and homogenizing it by using a high-pressure homogenizer until the system emulsion is fully mixed and uniform;

[0059] (5) stirring and cooling to prepare a stable sunscreen lotion, and discharging the product after testing and passing the test.

[0060] Example 2 Preparation of physical sunscreen lotion

[0061] The physical sunscreen lotion comprises the following raw material components in percentage by weight:

[0062] Physical sunscreen: titanium dioxide (and) triethoxycaprylylsilane (and) cyclohexasiloxane (and) cyclopentasiloxane (and) lauryl polyglyceryl-3 polydimethylsiloxyethyl polydimethylsiloxane 35wt%; zinc oxide (and) cyclopentasiloxane (and) cyclohexasiloxane (and) PEG-10 polydimethylsiloxane (and) lauryl polyglyceryl-3 polydimethylsiloxyethyl polydimethylsiloxane (and) triethoxycaprylylsilane 18wt%;

[0063] Primary emulsifier: Lauryl PEG-9 polydimethylsiloxyethyl dimethicone 3wt%; Cetyl PEG / PPG-10 / 1 dimethicone 2wt%

[0064] Auxiliary emulsifier: sorbitan oleate 1wt%;

[0065] Thickener: disteardimethylammonium hectorite 0.4wt%;

[0066] Film former: trimethylsiloxysilicate (and) C11-13 isoparaffin 2wt%;

[0067] Moisturizer: 3wt% butanediol; 5wt% 1,3-propylene glycol; 0.5wt% 1,2-hexanediol; 2wt% glycerol; 1wt% trehalose;

[0068] Emollients: cyclopentasiloxane 3wt%; dimethicone 2wt%; C9-12 alkane 1wt%; coconut oil alcohol-caprylate / caprate 2wt%; caprylyl polymethicone 1.5wt%; cetyl polydimethicone 0.5wt%;

[0069] Auxiliary additives: polydimethylsiloxane (and) polydimethylsiloxane / vinyl polydimethylsiloxane crosspolymer 1wt%; silica 0.8wt%; sodium calcium borosilicate 0.3wt%; bisabolol 0.1wt%; p-hydroxyacetophenone 0.5wt%; sodium chloride 1.2wt%; Polygonum cuspidatum root extract 1wt%;

[0070] The balance is deionized water;

[0071] The preparation method of the physical sunscreen emulsion comprises the following steps:

[0072] (1) Take a certain amount of physical sunscreen, thickener, film former, emollient, auxiliary additive, primary emulsifier and co-emulsifier, heat to 60-65° C., and homogenize until uniformly dispersed;

[0073] (2) Take a certain amount of moisturizer, auxiliary additives, and deionized water, heat them to 60-65° C., and stir until they are evenly dispersed;

[0074] (3) Slowly adding the material of step (2) to the material of step (1) under stirring;

[0075] (4) stirring the prepared emulsion material and homogenizing it by using a high-pressure homogenizer until the system emulsion is fully mixed and uniform;

[0076] (5) stirring and cooling to prepare a stable sunscreen lotion, and discharging the product after testing and passing the test.

[0077] Example 3 Preparation of physical sunscreen lotion

[0078] The physical sunscreen lotion comprises the following raw material components in percentage by weight:

[0079] Physical sunscreen: titanium dioxide (and) polyquaternium-51 (and) stearic acid (and) aluminum hydroxide 25wt%; zinc oxide (and) polyquaternium-61 (and) triethoxycaprylylsilane 15wt%;

[0080] Primary emulsifier: cetyl PEG / PPG-10 / 1 dimethicone 5wt%; lauryl PEG-9 polydimethylsiloxyethyl dimethicone 1%;

[0081] Auxiliary emulsifier: polyglycerol-4 isostearate 2wt%; sorbitan isostearate 1wt%;

[0082] Thickener: magnesium stearate 0.8wt%;

[0083] Film former: polydimethylsiloxane (and) trimethylsiloxysilicate 1.5wt%; acrylic acid (ester) copolymer 0.5wt%;

[0084] Moisturizer: propylene glycol 7wt%; glycerol 2wt%; pentylene glycol 3wt%; trehalose 1wt%; sorbitol 1wt%;

[0085] Emollients: 2wt% isononyl isononanoate; 2wt% dimethicone; 2wt% caprylic / capric triglyceride; 2wt% caprylyl polymethicone; 1wt% cetyl polydimethicone; 2wt% cyclopentasiloxane;

[0086] Auxiliary additives: polymethylsilsesquioxane 1wt%; sodium calcium borosilicate 0.5wt%; ginger root extract 0.1wt%; p-hydroxyacetophenone 0.5wt%; magnesium chloride 1wt%; purslane extract 1wt%; the balance is deionized water;

[0087] The preparation method of the physical sunscreen emulsion comprises the following steps:

[0088] (1) Take a certain amount of physical sunscreen, thickener, film former, emollient, auxiliary additive, primary emulsifier and co-emulsifier, heat to 60-65° C., and homogenize until uniformly dispersed;

[0089] (2) Take a certain amount of moisturizer, auxiliary additives, and deionized water, heat them to 60-65° C., and stir until they are evenly dispersed;

[0090] (3) Slowly adding the material of step (2) to the material of step (1) under stirring;

[0091] (4) stirring the prepared emulsion material and homogenizing it by using a high-pressure homogenizer until the system emulsion is fully mixed and uniform;

[0092] (5) stirring and cooling to prepare a stable sunscreen lotion, and discharging the product after testing and passing the test.

[0093] Example 4 Preparation of physical sunscreen lotion

[0094] The physical sunscreen lotion comprises the following raw material components in percentage by weight:

[0095] Physical sunscreen: titanium dioxide (and) triethoxycaprylylsilane 15wt%; zinc oxide (and) triethoxycaprylylsilane 15wt%; CI 77891 (and) polyquaternium-61 (and) polyquaternium-65 (and) triethoxycaprylylsilane (and) aluminum hydroxide 20wt%;

[0096] Primary emulsifier: Lauryl PEG-9 polydimethylsiloxyethyl dimethicone 1.5%; Cetyl PEG / PPG-10 / 1 dimethicone 2.5wt%

[0097] Auxiliary emulsifier: sorbitan isostearate 1wt%;

[0098] Thickener: disteardimethylammonium hectorite 0.8wt%;

[0099] Film former: 3 wt% of cyclopentasiloxane (and) trimethylsiloxysilicate; 0.5 wt% of acrylic acid (ester) copolymer;

[0100] Moisturizer: 3wt% butylene glycol, 8wt% 1,3-propylene glycol, 0.5wt% 1,2-hexanediol, 3wt% glycerol;

[0101] Emollients: 8wt% cyclopentasiloxane; 2wt% dimethicone; 2wt% cetyl ethylhexanoate; 1wt% octyl methicone; 1wt% cetyl dimethicone; 2wt% triethylhexanoin;

[0102] Auxiliary additives: boron nitride 1wt%; sodium calcium borosilicate 0.3wt%; ginger root extract 0.1wt%; p-hydroxyacetophenone 0.5wt%; magnesium chloride 1wt%; purslane extract 1wt%; polydimethylsiloxane (and) polydimethylsiloxane / vinyl polydimethylsiloxane crosspolymer 1wt%; the balance is deionized water;

[0103] The preparation method of the physical sunscreen emulsion comprises the following steps:

[0104] (1) Take a certain amount of physical sunscreen, thickener, film former, emollient, auxiliary additive, primary emulsifier and co-emulsifier, heat to 60-65° C., and homogenize until uniformly dispersed;

[0105] (2) Take a certain amount of moisturizer, auxiliary additives, and deionized water, heat them to 60-65° C., and stir until they are evenly dispersed;

[0106] (3) Slowly adding the material of step (2) to the material of step (1) under stirring;

[0107] (4) stirring the prepared emulsion material and homogenizing it by using a high-pressure homogenizer until the system emulsion is fully mixed and uniform;

[0108] (5) stirring and cooling to prepare a stable sunscreen lotion, and discharging the product after testing and passing the test.

[0109] Experimental Example 1: Whitening Test

[0110] A control experiment was set up for the comparative evaluation experiment of whitening after application. Control groups 1 and 2 were respectively ordinary pure physical sunscreen products on the market; experimental group 1 tested the physical sunscreen lotion prepared in Example 1, experimental group 2 tested the physical sunscreen lotion prepared in Example 2, experimental group 3 tested the physical sunscreen lotion prepared in Example 3, and experimental group 4 tested the physical sunscreen lotion prepared in Example 4. The 6 groups of products were distributed to 50 volunteers for use, and the following data were obtained:

[0111] The specific usage method for volunteers is: after cleaning the facial skin, the volunteers first apply control group 1, and according to the requirements of the evaluation questionnaire form, choose one of the four options and fill in the score; after removing makeup and cleaning the facial skin again, apply control group 2, and according to the requirements of the evaluation questionnaire form, choose one of the four options and fill in the score; the physical sunscreen lotions prepared by test evaluation examples 1 to 4 are repeatedly performed in sequence to finally obtain the evaluation results.

[0112] Table 1 Comprehensive scoring comparison of the subjects' evaluation

[0113]

[0114] As can be seen from Table 1 above, among 50 volunteers, more than 80% of the volunteers felt that the physical sunscreen lotions prepared in Examples 1 to 4 of the present invention did not make the skin look whiter or were a little white but acceptable after applying the sunscreen lotion. Nearly 80% of the volunteers felt that the other two ordinary pure physical sunscreen products on the market made the skin look obviously whiter or particularly whiter after application. This shows that the present invention has a good effect in reducing the whitening phenomenon of the system after application.

[0115] In addition, it can be seen from Table 1 that among the physical sunscreen lotions prepared in Examples 1 to 4, especially the physical sunscreen lotions prepared in Examples 1 and 2, the number of people whose whitening is not naturally apparent is much higher than that of the physical sunscreen lotions prepared in Examples 3 and 4. This shows that in the physical sunscreen lotion of the present invention, the selection of physical sunscreen agents is very critical. When the physical sunscreen agent is selected from the physical sunscreen agents of the combination described in Examples 1 and 2 (i.e., titanium dioxide (and) triethoxycaprylylsilane (and) cyclohexasiloxane (and) cyclopentasiloxane (and) lauryl polyglyceryl-3 polydimethylsiloxyethyl polydimethicone; zinc oxide (and) cyclopentasiloxane (and) cyclohexasiloxane (and) PEG-10 polydimethylsiloxane (and) lauryl polyglyceryl-3 polydimethylsiloxyethyl polydimethicone (and) triethoxycaprylylsilane), the physical sunscreen lotion prepared has a much higher degree of improvement in the whitening phenomenon after application of the sunscreen lotion than the physical sunscreen lotion prepared from the physical sunscreen agents of other combinations.

[0116] It can also be seen from Table 1 that the number of people whose skin does not show whiteness naturally in the physical sunscreen lotion prepared in Example 1 is significantly higher than that in the physical sunscreen lotion prepared in Example 2. This shows that in the physical sunscreen lotion of the present invention, the selection of the primary emulsifier, auxiliary emulsifier, thickener, film former, moisturizer, emollient and auxiliary additives is also very important, in addition to the key selection of the physical sunscreen agent. When a combination of titanium dioxide (and) triethoxycaprylylsilane (and) cyclohexasiloxane (and) cyclopentasiloxane (and) lauryl polyglyceryl-3 polydimethylsiloxyethyl polydimethylsiloxane; zinc oxide (and) cyclopentasiloxane (and) cyclohexasiloxane (and) PEG-10 polydimethylsiloxane (and) lauryl polyglyceryl-3 polydimethylsiloxyethyl polydimethylsiloxane (and) triethoxycaprylylsilane is used as a physical sunscreen agent; and a physical sunscreen lotion prepared by using the primary emulsifier, co-emulsifier, thickener, film former, humectant, emollient and auxiliary additives in Example 1 is used at the same time; the degree of improvement in the whitening phenomenon after application of the sunscreen lotion is significantly higher than that of a physical sunscreen lotion prepared by using other combinations of the primary emulsifier, co-emulsifier, thickener, film former, humectant, emollient and auxiliary additives.

[0117] Experimental Example 2: Stability Test

[0118] We further tested the stability of the product of the present invention (physical sunscreen lotion prepared in Example 1) according to Table 2. The test results are shown in Table 2.

[0119] Table 2. Product stability test record

[0120]

[0121]

Claims

1. A physical sunscreen lotion, characterized in that: Contains the following components in weight percentage: Physical sunscreen 0-60%; primary emulsifier 0-10%; auxiliary emulsifier 0-10%; thickener 0.1-10%; film former 0-10%; moisturizer 5-30%; emollient 0-20%; auxiliary additive 0-30%; the balance is water.

2. The physical sunscreen lotion according to claim 1, characterized in that: The physical sunscreen is selected from one or a mixture of more than one of the following components: Titanium Dioxide (and) Triethoxycaprylylsilane (and) Cyclohexasiloxane (and) Cyclopentasiloxane (and) Lauryl Polyglyceryl-3 Polydimethylsiloxyethyl Dimethicone; Titanium Dioxide (and) Cyclopentasiloxane (and) Cyclohexasiloxane (and) Lauryl Polyglyceryl-3 Polydimethylsiloxyethyl Dimethicone (and) Triethoxycaprylylsilane; Titanium Dioxide (and) Polyquaternium-51 (and) Stearate (and) Aluminum Hydroxide; Titanium Dioxide (and) Triethoxycaprylylsilane; CI 77891 (and) Polyquaternium-61 (and) Polyquaternium-65 (and) Triethoxycaprylylsilane (and) Aluminum Hydroxide; Zinc Oxide (and) Cyclopentasiloxane (and) Cyclohexasiloxane (and) PEG-10 Dimethicone (and) Lauryl Polyglyceryl-3 Polydimethylsiloxyethyl Dimethicone (and) Triethoxycaprylylsilane; Zinc oxide (and) polyquaternium-61 (and) triethoxycaprylylsilane; Zinc oxide (and) triethoxycaprylylsilane.

3. The pure physical sunscreen lotion according to claim 1, characterized in that: The primary emulsifier is selected from one or a mixture of more than one of the following components: From Cetyl PEG / PPG-10 / 1 Dimethicone; PEG-10 Dimethicone; Lauryl PEG-9 Polydimethylsiloxyethyl Dimethicone; Lauryl PEG-10 Tri(trimethicone)silylethyl Dimethicone; Cyclopentasiloxane (and) PEG / PPG-18 / 18 Dimethicone; PEG-9 Polydimethylsiloxyethyl Dimethicone.

4. The physical sunscreen emulsion according to claim 1, characterized in that: The co-emulsifier is selected from one or a mixture of more than one of the following components: PEG-11 Methyl Ether Dimethicone; Sorbitan Oleate; Sorbitan Sesquioleate; Sorbitan Isostearate; Polyglyceryl-4 Isostearate; Polyglyceryl-2 Triisostearate.

5. The pure physical sunscreen lotion according to claim 1, characterized in that: The thickener is selected from one or a mixture of more than one of the following components: Disteardimethylammonium hectorite; magnesium stearate; magnesium aluminum silicate; bentonite; trihydroxystearin; hectorite; stearalkonium hectorite; xanthan gum; cellulose gum.

6. The physical sunscreen emulsion according to claim 1, characterized in that: The film-forming agent is selected from one or a mixture of more than one of the following components: Pentapolydimethylsiloxane (and) trimethylsiloxysilicate; Polydimethylsiloxane (and) trimethylsiloxysilicate; Trimethylsiloxysilicate (and) C11-13 isoparaffin; Styrene / acrylates copolymer; VP / eicosene copolymer; Triacontyl PVP; VP / eicosene copolymer; Acrylates copolymer.

7. The physical sunscreen emulsion according to claim 1, characterized in that: The moisturizing agent is selected from one or a mixture of more than one of the following components: butylene glycol; propylene glycol; 1,2-hexanediol; trehalose; 1,3-propanediol; glycerol; pentanediol; sorbitol; glycerol.

8. The physical sunscreen emulsion according to claim 1, characterized in that: The emollient is selected from one or more of the following components: isononyl isononanoate; polydimethylsiloxane; C9-12 alkane; octyl polymethylsiloxane; cetyl polydimethylsiloxane; cyclopentasiloxane; coconut oil alcohol-caprylate / caprate; caprylic / capric triglyceride; cyclopentasiloxane; cetyl ethylhexanoate; glyceryl tri(ethylhexanoate).

9. The physical sunscreen emulsion according to claim 1, characterized in that: The auxiliary additive is selected from one or more of the following components: polymethylsilsesquioxane; silica; sodium calcium borosilicate, bisabolol; ginger root extract; p-hydroxyacetophenone; sodium chloride; polydimethylsiloxane (and) polydimethylsiloxane / vinyl polydimethylsiloxane crosspolymer; knotweed root extract; purslane extract; boron nitride; sodium calcium borosilicate; magnesium chloride.

10. The method for preparing the physical sunscreen emulsion according to any one of claims 1 to 9, characterized in that: The following steps are included: (1) Take a certain amount of physical sunscreen, thickener, film former, emollient, auxiliary additive, primary emulsifier and co-emulsifier, heat to 60-65° C., and homogenize until uniformly dispersed; (2) Take a certain amount of moisturizer, auxiliary additives, and deionized water, heat them to 60-65° C., and stir until they are evenly dispersed; (3) Slowly adding the material of step (2) to the material of step (1) under stirring; (4) stirring the prepared emulsion material and homogenizing it by using a high-pressure homogenizer until the system emulsion is fully mixed and uniform; (5) Stir and cool to prepare a stable sunscreen lotion.

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