Sunscreen cosmetic and preparation method thereof

Abstract

The invention provides a sunscreen cosmetic. The sunscreen cosmetic is prepared from the following raw materials: a radix scutellariae extract, a tussilago farfara extract, nano zinc oxide, nano titanium dioxide, ethyl methoxycinnamate, glycerol, octadecanol, vaseline, propylene glycol, cetearyl glucoside, cetostearyl alcohol and phenoxyethanol. The sunscreen cosmetic disclosed by the invention has the effects of whitening and moisturizing, resisting ultraviolet rays and repairing after sunburn (for example, improving and repairing erythema of the skin after sunburn).

Description

Technical Field

[0001] The present invention relates to the technical field of cosmetics, and in particular to a sunscreen cosmetic and a preparation method thereof. Background Art

[0002] Ultraviolet rays are part of the solar radiation and are divided into three bands according to their wavelengths: 315-400nm (UVA), 280-315nm (UVB), and 200-280nm (UVC). Although UVC has the shortest wavelength and carries the most energy, it is most severely blocked by the atmosphere and has almost no effect on the human body. UVB and UVA are important causes of a variety of skin diseases. UVB is a minor component of sunlight reaching the earth's surface. In animal experiments, it has high burning, high mutagenicity, and high carcinogenicity. After being irradiated by UVB, it may cause skin DNA damage and produce photoproducts such as cyclobutane pyrimidine dimers, which can induce skin cell mutations. In addition, after UVB irradiation, it will cause severe inflammatory reactions in the epidermis. Among them, the large-scale release of inflammatory factors by keratinocytes is a potential cause of local tingling and allergies. Including TNF-α, IL-1, IL-4, IL-6, etc. This series of reactions may be due to the instantaneous rupture of keratinocytes caused by UVB, releasing inflammatory factors into the matrix, which in turn activate receptors on other keratinocytes, thereby activating signaling pathways such as NFκB, causing keratinocytes to further express and release inflammatory factors, thereby causing local redness or tingling. At the same time, excessive exposure of the skin to UVB will affect the barrier function of the skin. UVA is also said to be able to cause DNA damage directly or indirectly, but its main site of action is the dermis cells of the skin, which is an important factor in causing skin aging. After UVA irradiation, a large number of active groups will be generated, which will further activate a variety of transcription factors, which will affect cell proliferation, apoptosis, necrosis and the expression of functional proteins of cells. In the process of cell damage caused by ultraviolet rays, cell apoptosis, cell death and programmed necrosis often occur simultaneously. For example, after ultraviolet irradiation, cell DNA damage, large amounts of mitochondrial electrons leak, and intracellular protein oxidation make it impossible to complete repair, so that the cells enter the apoptosis program. Appropriate doses of ultraviolet radiation are beneficial to the skin, but excessive exposure to ultraviolet rays can cause oxidative damage to the skin, damage to skin cell DNA, and skin pigmentation, which can lead to skin barrier damage and aging. In order to reduce the damage to the skin caused by ultraviolet radiation and improve skin health, sunscreen products came into being.

[0003] There are many sunscreen products on the market, which are mainly divided into physical sunscreen and chemical sunscreen. Physical sunscreen forms a protective layer on the surface of the skin, reflects and absorbs the damage that may be caused to the skin by ultraviolet rays, so as to achieve the purpose of protecting the skin, but the dosage is limited and the shielding effect is not good. There are many types of chemical sunscreens involved in chemical sunscreens, which mainly absorb the part of ultraviolet rays that may cause damage to the skin before the cells are damaged, so as to achieve the purpose of sunscreen. Existing sunscreen products contain more artificially synthesized chemicals, which can cause rough skin and inflammation after long-term use, and are also highly sensitizing. In recent years, some natural Chinese herbal plants with sunscreen and anti-ultraviolet functions have been found. Because they have little irritation to the skin, they also have the effects of whitening and anti-freckle, anti-aging, etc. while sunscreening, and have both sunscreen and nutrition, so plant sunscreens have attracted much attention from people inside and outside the industry.

[0004] However, natural plant extracts are widely used in sunscreen products because of their safe, effective, mild and non-irritating ingredients. However, the introduction of multiple extracts affects the breathability and skin-friendliness of sunscreens, and the sunscreen effect is not satisfactory. Patent CN115252512B (publication date 2022-10-01) discloses a sunscreen composition, its preparation method and application. Specifically, the sunscreen composition is prepared using Edelweiss extract, white water lily extract, glucan embedded fullerene, Centella asiatica extract and marine glycoprotein. Although the moisturizing and soothing effects of sunscreen products are improved to a certain extent, the sunscreen effect of the product needs to be further improved. Patent CN115444767A (publication date 2022-10-09) discloses a sunscreen composition and a preparation method thereof. The physical sunscreen zinc oxide is combined with the auxiliary effect of plant extracts to prepare a sunscreen composition with good sun protection effect and stable skin care. Although mica and pearl powder are introduced to reduce the agglomeration of zinc oxide and achieve whitening effect, the introduced mica and pearl powder are also inorganic powders, which affect the absorbency, air permeability and transparency of the sunscreen composition, and affect the skin-friendly feel of the product.

[0005] Scutellaria baicalensis is a perennial herbaceous plant of the genus Scutellaria in the family Lamiaceae. It is also known as camellia root and earthy tea root. Scutellaria baicalensis contains rich flavonoids. Scutellaria baicalensis root extract can strongly absorb ultraviolet radiation and scavenge DPPH and ABTS free radicals. It can play a certain antioxidant role while protecting against the sun, and has the effect of enhancing sun protection. When Scutellaria baicalensis root extract is added to sunscreen preparations, it is found that it can significantly improve the sun protection factor of sunscreen (see non-patent literature: Seok JK, Kwak JY, Choi GW, et al. Scutellaria radix extract as a natural UV protectant for human skin [J]. Phytotherapy Research, 2016, 30 (3): 374-379). Studies have found that baicalin, the main component of Scutellaria baicalensis, can significantly reduce the photodamage of mouse skin caused by UVB irradiation, and has significant sunscreen performance in the medium-wave ultraviolet band (see non-patent literature: Xu Yang, Zhou Bingrong, Wu Di, et al. Effects of baicalin on photodamage of mouse skin after UVB irradiation [J]. Chinese Journal of Aesthetic Medicine, 2012, 21(1): 84-86). In addition, Scutellaria baicalensis also has a good anti-inflammatory effect. Studies have shown that Scutellaria baicalensis extract has a good anti-inflammatory effect through mouse foot swelling experiments and in vitro cell anti-inflammatory experiments (see non-patent literature: Chen Tao. Research on the anti-inflammatory activity of the traditional Chinese medicine Scutellaria baicalensis and its main components [D]. Changchun: Jilin University, 2017). The sunscreen uses Scutellaria baicalensis as the raw material, which has an antioxidant effect. It can absorb ultraviolet rays, scavenge oxygen free radicals, inhibit the production of melanin, prevent ultraviolet-induced oxidative damage to the red blood cell membrane, inhibit the secretion of inflammatory cytokines, inhibit tyrosinase activity, and repair skin damage (see patent CN109200005A, published on January 15, 2019).

[0006] Coltsfoot, also known as winter flower, coltsfoot flower, lamp flower, nine-nine flower, wormwood flower, etc., is a plant of the Asteraceae family, mainly produced in Tianshui, Qingyang, Huanxian, and Lingtai, Gansu. Pharmacological studies have found that its active ingredients mainly include flavonoids, triterpenoid saponins, alkaloids, organic acids, volatile oils, etc. Coltsfoot extract has good bactericidal and anti-inflammatory effects, can effectively resist ultraviolet rays, and synergizes with linden flower extract to effectively defend against ultraviolet rays, protect the skin, prevent sunburn, and repair sunburned skin, moisturizing and whitening (see patent CN104027282A, published on September 10, 2014). Studies have shown that coltsfoot has the following mechanism of action and can be used for antioxidant and anti-inflammatory effects: (1) Activates the activity of phase II detoxification enzyme quinone oxidoreductase [NAD(P)H: quinone oxireductase, NQO], upregulates the level of endogenous antioxidant glutathione in human epidermal cells, and inhibits the level of reactive oxygen free radicals, thus inhibiting oxidative stress; (2) Inhibits the expression of inflammatory factors nitric oxide (NO), interleukin-6 (IL-6), interleukin-10 (IL-10), and tumor necrosis factor (TNFα), thus having anti-inflammatory effects (see patent CN106074677B, published on November 9, 2016).

[0007] Based on this, the present application combines physical sunscreen with chemical sunscreen to ensure excellent sunscreen effects while avoiding the granular feel caused by the large amounts of zinc oxide and titanium dioxide particles in traditional sunscreens agglomerating to form particles, while enhancing the moisturizing properties of physical sunscreens. Summary of the invention

[0008] The first aspect of the present invention provides a sunscreen cosmetic, wherein the raw materials of the sunscreen cosmetic include, by mass percentage, 0.1%-1% scutellaria baicalensis extract, 0.1%-1% coltsfoot extract, 1%-10% nano zinc oxide, 1%-10% nano titanium dioxide and 1%-12% ethyl methoxycinnamate.

[0009] The extraction method of the scutellaria baicalensis extract includes but is not limited to one or more of solvent extraction, immersion, acid hydrolysis, enzymatic hydrolysis, ultrasonic extraction, microwave extraction and supercritical fluid extraction.

[0010] The extraction method of the coltsfoot extract includes but is not limited to one or more of solvent extraction, immersion, acid hydrolysis, enzymatic hydrolysis, ultrasonic extraction, microwave extraction and supercritical fluid extraction.

[0011] The raw materials of the sunscreen cosmetics also include one or more of moisturizers, emulsifiers, emulsion stabilizers, preservatives, thickeners or flavors.

[0012] Preferably, the moisturizing agent includes one or more of glycerol, propylene glycol, butylene glycol, xylitol, sorbitol, lactic acid or its salt, provitamin B5, silk amino acids, maltotetraose, inulin, avena sativa, yeast extract, hyaluronic acid, chitin, trehalose, raffinose, maltotetraose, pullulan, tremella polysaccharide, β-glucan, γ-polyglutamate sodium, sour bean seed polysaccharide, sclerotium gum, vaseline, white mineral oil, olive oil, jojoba oil, shea butter, macadamia oil or ceramide.

[0013] Preferably, the emulsifier includes one or more of a nonionic emulsifier (e.g., steareth-2, steareth-21, PEG-30, PEG-100, polyglyceryl-10 stearate, polyglyceryl-10 stearate, sorbitan olivate, polyglyceryl-3 polyricinoleate, glyceryl stearate, cetearyl olivate, cetearyl glucoside), a cationic emulsifier (e.g., cetyltrimethylammonium bromide, cetylbenzyldimethylammonium bromide, cetrimonium chloride, stearyltrimethylammonium chloride, palmitamidopropyltrimethylammonium chloride), an anionic emulsifier (e.g., sodium lauryl sulfate, ammonium lauryl sulfate, sodium lauryl ether sulfate, sodium cetearyl sulfate, sodium stearoyl glutamate), a zwitterionic emulsifier (e.g., lecithin, betaine, amino acid) or a polymer emulsifier (e.g., polysaccharides, celluloses, polyoxyethylenes, polyacrylic acids, natural gums and modified products thereof).

[0014] Preferably, the emulsion stabilizer includes gum arabic, xanthan gum, dehydrogenated xanthan gum, sclerotium gum, carrageenan, carbomer, gellan gum, polyacrylate, polyacrylate-13, polyacrylate cross-linked polymer-5, hydroxyethyl acrylate / sodium acryloyldimethyl taurate copolymer, ammonium acryloyldimethyl taurate / VP copolymer, acrylic acid (ester) / C 10-30 One or more of alkyl acrylate crosspolymer, sodium acrylate / sodium acryloyldimethyl taurate copolymer, lecithins, glycosides, celluloses, cetearyl alcohol, polysorbate-80, sorbitan oleate, polysorbate-60 or polysorbate-20.

[0015] Preferably, the preservative includes one or more of phenoxyethanol, parabens, benzoic acid and its salts and esters, sorbic acid, salicylic acid and its salts, polyaminopropyl biguanide, DMDM ​​hydantoin, imidazolidinyl urea, diimidazoles urea, isothiazolinone or iodopropynyl butyl carbamate.

[0016] Preferably, the thickener includes inorganic salts (such as sodium chloride, potassium chloride, ammonium chloride, monoethanolamine chloride, diethanolamine chloride, sodium sulfate, sodium phosphate, disodium phosphate and pentasodium triphosphate), fatty alcohols / acids (such as lauryl alcohol, myristyl alcohol, stearyl alcohol, decanol, hexanol, octanol, linoleic acid, linolenic acid, myristic acid, stearic acid), alkanolamides (such as coconut diethanolamide, coconut monoethanolamide, coconut monoisopropanolamide, isostearyl diethanolamide, linoleyl diethanolamide, myristic diethanolamide, oil diethanolamide, palm monoethanolamide, castor oil monoethanolamide , sesame diethanolamide), ethers (e.g., cetyl alcohol polyoxyethylene ether, isocetyl alcohol polyoxyethylene ether, lauryl alcohol polyoxyethylene ether), esters (e.g., PEG-120 methyl glucose dioleate, PEG-150 pentaerythritol tetrastearate, PEG-160 sorbitan triisostearate), celluloses (e.g., cellulose, cellulose gum, carboxymethyl hydroxyethyl cellulose, cetyl hydroxyethyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, carboxymethyl cellulose), or polyacrylic acids (e.g., polyacrylic acid, acrylates / C 10-30 One or more of alkyl acrylate cross-linked polymer, sodium acrylate / ethylene isodecanoate cross-linked polymer, acrylate / VA cross-linked polymer).

[0017] Preferably, the flavor includes one or more of animal flavors (such as musk, ambergris), plant flavors (such as lilac extract, rose extract, jasmine extract, mint extract, lavender extract) or synthetic flavors (such as benzyl alcohol, linalool, methyl 2-octynoate, citronellol, geraniol, hydroxycitronellal, eugenol, isoeugenol, α-isomethyl ionone, amyl cinnamaldehyde).

[0018] The raw materials of the sunscreen cosmetics also include water. Preferably, the water in the raw materials includes deionized water.

[0019] In a specific embodiment of the present invention, the raw materials of the sunscreen cosmetics include active ingredients and excipients. The active ingredients are scutellaria baicalensis extract, coltsfoot extract, nano zinc oxide, nano titanium dioxide and ethyl methoxycinnamate; the excipients include one or more of moisturizers, emulsifiers, emulsion stabilizers, thickeners, preservatives or flavors.

[0020] In a specific embodiment of the present invention, the raw materials of the sunscreen cosmetics include, by mass percentage, 0.1%-1% scutellaria baicalensis extract, 0.1%-1% coltsfoot extract, 1%-10% nano zinc oxide, 1%-10% nano titanium dioxide, 1%-12% ethyl methoxycinnamate, 1%-13% glycerol, 0.1%-5% stearyl alcohol, 1%-15% vaseline, 1%-12% propylene glycol, 1%-10% cetearyl glucoside, 1%-10% cetearyl alcohol, 0.1%-5% phenoxyethanol, and the balance water.

[0021] The mass ratio of the scutellaria baicalensis extract to the coltsfoot extract in the raw materials of the sunscreen cosmetics is (1-3):1, preferably (1.8-2.5):1.

[0022] In a specific embodiment of the present invention, the raw materials of the sunscreen cosmetics include, by mass percentage, 0.5%-0.7% scutellaria baicalensis extract, 0.2%-0.6% coltsfoot extract, 1%-10% nano zinc oxide, 1%-10% nano titanium dioxide, 1%-12% ethyl methoxycinnamate, 1%-13% glycerol, 0.1%-5% stearyl alcohol, 1%-15% vaseline, 1%-12% propylene glycol, 1%-10% cetearyl glucoside, 1%-10% cetearyl alcohol, 0.1%-5% phenoxyethanol, and the balance water.

[0023] In a specific embodiment of the present invention, the raw materials of the sunscreen cosmetics include, by mass percentage, 0.5%-0.7% scutellaria baicalensis extract, 0.2%-0.6% coltsfoot extract, 4%-8% nano zinc oxide, 3%-7% nano titanium dioxide, 4%-8% ethyl methoxycinnamate, 3%-7% glycerol, 0.3%-0.8% stearyl alcohol, 3%-7% vaseline, 2%-6% propylene glycol, 1%-3% cetearyl glucoside, 2%-6% cetearyl alcohol, 0.1%-2% phenoxyethanol, and the balance water.

[0024] The preparation types of the sunscreen cosmetics include but are not limited to lotions, creams, sprays, gels or ointments, etc.

[0025] The second aspect of the present invention provides a method for preparing the sunscreen cosmetics, which comprises: dispersing nano zinc oxide and nano titanium dioxide; preparing a solution A containing ethyl methoxycinnamate; adding the dispersed nano zinc oxide and nano titanium dioxide to the solution A and homogenizing and stirring to obtain a solution B; adding the scutellaria baicalensis extract and the coltsfoot extract to the solution B and homogenizing and stirring.

[0026] Preferably, the raw materials of the sunscreen cosmetics include, by mass percentage, 0.1%-1% scutellaria baicalensis extract, 0.1%-1% coltsfoot extract, 1%-10% nano zinc oxide, 1%-10% nano titanium dioxide and 1%-12% ethyl methoxycinnamate.

[0027] The extraction method of the scutellaria baicalensis extract includes but is not limited to one or more of solvent extraction, immersion, acid hydrolysis, enzymatic hydrolysis, ultrasonic extraction, microwave extraction and supercritical fluid extraction.

[0028] The extraction method of the coltsfoot extract includes but is not limited to one or more of solvent extraction, immersion, acid hydrolysis, enzymatic hydrolysis, ultrasonic extraction, microwave extraction and supercritical fluid extraction.

[0029] The raw materials of the sunscreen cosmetics also include one or more of moisturizers, emulsifiers, emulsion stabilizers, preservatives, thickeners or flavors.

[0030] Preferably, the moisturizing agent includes one or more of glycerol, propylene glycol, butylene glycol, xylitol, sorbitol, lactic acid or its salt, provitamin B5, silk amino acids, maltotetraose, inulin, avena sativa, yeast extract, hyaluronic acid, chitin, trehalose, raffinose, maltotetraose, pullulan, tremella polysaccharide, β-glucan, γ-polyglutamate sodium, sour bean seed polysaccharide, sclerotium gum, vaseline, white mineral oil, olive oil, jojoba oil, shea butter, macadamia oil or ceramide.

[0031] Preferably, the emulsifier includes one or more of a nonionic emulsifier (e.g., steareth-2, steareth-21, PEG-30, PEG-100, polyglyceryl-10 stearate, polyglyceryl-10 stearate, sorbitan olivate, polyglyceryl-3 polyricinoleate, glyceryl stearate, cetearyl olivate, cetearyl glucoside), a cationic emulsifier (e.g., cetyltrimethylammonium bromide, cetylbenzyldimethylammonium bromide, cetrimonium chloride, stearyltrimethylammonium chloride, palmitamidopropyltrimethylammonium chloride), an anionic emulsifier (e.g., sodium lauryl sulfate, ammonium lauryl sulfate, sodium lauryl ether sulfate, sodium cetearyl sulfate, sodium stearoyl glutamate), a zwitterionic emulsifier (e.g., lecithin, betaine, amino acid) or a polymer emulsifier (e.g., polysaccharides, celluloses, polyoxyethylenes, polyacrylic acids, natural gums and modified products thereof).

[0032] Preferably, the emulsion stabilizer includes gum arabic, xanthan gum, dehydrogenated xanthan gum, sclerotium gum, carrageenan, carbomer, gellan gum, polyacrylate, polyacrylate-13, polyacrylate cross-linked polymer-5, hydroxyethyl acrylate / sodium acryloyldimethyl taurate copolymer, ammonium acryloyldimethyl taurate / VP copolymer, acrylic acid (ester) / C 10-30 One or more of alkyl acrylate crosspolymer, sodium acrylate / sodium acryloyldimethyl taurate copolymer, lecithins, glycosides, celluloses, cetearyl alcohol, polysorbate-80, sorbitan oleate, polysorbate-60 or polysorbate-20.

[0033] Preferably, the preservative is one or more of phenoxyethanol, parabens, benzoic acid and its salts and esters, sorbic acid, salicylic acid and its salts, polyaminopropyl biguanide, DMDM ​​hydantoin, imidazolidinyl urea, diimidazoles urea, isothiazolinone or iodopropynyl butyl carbamate.

[0034] Preferably, the thickener includes inorganic salts (such as sodium chloride, potassium chloride, ammonium chloride, monoethanolamine chloride, diethanolamine chloride, sodium sulfate, sodium phosphate, disodium phosphate and pentasodium triphosphate), fatty alcohols / acids (such as lauryl alcohol, myristyl alcohol, stearyl alcohol, decanol, hexanol, octanol, linoleic acid, linolenic acid, myristic acid, stearic acid), alkanolamides (such as coconut diethanolamide, coconut monoethanolamide, coconut monoisopropanolamide, isostearyl diethanolamide, linoleyl diethanolamide, myristic diethanolamide, oil diethanolamide, palm monoethanolamide, castor oil monoethanolamide, sesame diethanolamide), ethers (such as cetyl alcohol polyoxyethylene ether, isocetyl alcohol One or more of the following: polyoxyethylene ether, lauryl polyoxyethylene ether), esters (e.g. PEG-120 methyl glucose dioleate, PEG-150 pentaerythritol tetrastearate, PEG-160 sorbitan triisostearate), celluloses (e.g. cellulose, cellulose gum, carboxymethyl hydroxyethyl cellulose, spermaceti cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, carboxymethyl cellulose) or polyacrylic acids (e.g. polyacrylic acid, acrylates / C10-30 alkyl acrylate crosspolymer, sodium acrylate / ethylene isodecanol crosspolymer, acrylates / VA crosspolymer).

[0035] Preferably, the flavor includes one or more of animal flavors (such as musk, ambergris), plant flavors (such as lilac extract, rose extract, jasmine extract, mint extract, lavender extract) or synthetic flavors (such as benzyl alcohol, linalool, methyl 2-octynoate, citronellol, geraniol, hydroxycitronellal, eugenol, isoeugenol, α-isomethyl ionone, amyl cinnamaldehyde).

[0036] The raw materials of the sunscreen cosmetics also include water. Preferably, the water in the raw materials includes deionized water.

[0037] In a specific embodiment of the present invention, the raw materials of the sunscreen cosmetics include, by mass percentage, 0.1%-1% scutellaria baicalensis extract, 0.1%-1% coltsfoot extract, 1%-10% nano zinc oxide, 1%-10% nano titanium dioxide, 1%-12% ethyl methoxycinnamate, 1%-13% glycerol, 0.1%-5% stearyl alcohol, 1%-15% vaseline, 1%-12% propylene glycol, 1%-10% cetearyl glucoside, 1%-10% cetearyl alcohol, 0.1%-5% phenoxyethanol, and the balance is water.

[0038] The mass ratio of the scutellaria baicalensis extract to the coltsfoot extract in the raw materials of the sunscreen cosmetics is (1-3):1, preferably (1.8-2.5):1.

[0039] In a specific embodiment of the present invention, the raw materials of the sunscreen cosmetics include, by mass percentage, 0.5%-0.7% scutellaria baicalensis extract, 0.2%-0.6% coltsfoot extract, 1%-10% nano zinc oxide, 1%-10% nano titanium dioxide, 1%-12% ethyl methoxycinnamate, 1%-13% glycerol, 0.1%-5% stearyl alcohol, 1%-15% vaseline, 1%-12% propylene glycol, 1%-10% cetearyl glucoside, 1%-10% cetearyl alcohol, 0.1%-5% phenoxyethanol, and the balance water.

[0040] In a specific embodiment of the present invention, the raw materials of the sunscreen cosmetics include, by mass percentage, 0.5%-0.7% scutellaria baicalensis extract, 0.2%-0.6% coltsfoot extract, 4%-8% nano zinc oxide, 3%-7% nano titanium dioxide, 4%-8% ethyl methoxycinnamate, 3%-7% glycerol, 0.3%-0.8% stearyl alcohol, 3%-7% vaseline, 2%-6% propylene glycol, 1%-3% cetearyl glucoside, 2%-6% cetearyl alcohol, 0.1%-2% phenoxyethanol, and the balance water.

[0041] The preparation types of the sunscreen cosmetics include but are not limited to lotions, creams, sprays, gels or ointments, etc.

[0042] Preferably, the preparation method comprises:

[0043] S1: Pre-disperse nano zinc oxide and nano titanium dioxide separately with appropriate amount of glycerol;

[0044] S2: deionized water, remaining glycerin, propylene glycol, petrolatum, stearyl alcohol, phenoxyethanol, ethyl methoxycinnamate, cetearyl glucoside and cetearyl alcohol are homogenized and stirred under heating to obtain solution A;

[0045] S3: adding the dispersed nano zinc oxide and nano titanium dioxide to the solution A obtained in S2, and stirring homogeneously to obtain solution B;

[0046] S4: adding the scutellaria baicalensis extract and coltsfoot extract to the solution B obtained in S3 and stirring homogeneously;

[0047] S5: After vacuum degassing and discharging, the sunscreen cosmetics are obtained after standing.

[0048] Preferably, the heating method in step S2 includes but is not limited to water bath heating, oil bath heating, steam bath heating, sand bath heating, electric heating, etc. Preferably, water bath heating is used.

[0049] Preferably, the heating temperature in step S2 is 80-85°C.

[0050] Preferably, the homogenizing and stirring time in step S2 is 10-30 min.

[0051] Preferably, in step S3, the dispersed nano zinc oxide and nano titanium dioxide are added to solution A obtained in step S2, and the temperature of the solution A is 30-40°C.

[0052] Preferably, the homogenizing and stirring time in step S3 is 10-30 min.

[0053] Preferably, the homogenizing and stirring time in step S4 is 10-30 min.

[0054] Preferably, the vacuuming method in step S5 includes but is not limited to mechanical pump vacuuming, diffusion pump vacuuming, molecular pump vacuuming or freezing pump vacuuming.

[0055] In a specific embodiment of the present invention, the preparation method comprises:

[0056] S1: Pre-disperse nano zinc oxide and nano titanium dioxide separately with appropriate amount of glycerol;

[0057] S2: deionized water, remaining glycerin, propylene glycol, petrolatum, stearyl alcohol, phenoxyethanol, ethyl methoxycinnamate, cetearyl glucoside and cetearyl alcohol were mixed, and homogenized and stirred in a water bath at 80-85° C. for 10-30 min to obtain solution A;

[0058] S3: at 30-40°C, add the dispersed nano zinc oxide and nano titanium dioxide to the solution A obtained in S2, and stir homogenously for 10-30 minutes to obtain solution B;

[0059] S4: adding the scutellaria baicalensis extract and coltsfoot extract to the solution B obtained in S3 and stirring homogenously for 10-30 minutes;

[0060] S5: The material is discharged through vacuum degassing and left to stand to obtain sunscreen cosmetics.

[0061] The third aspect of the present invention provides a use of the sunscreen cosmetic in after-sun repair.

[0062] The skin includes, but is not limited to, the skin on the back, legs, hands, face, arms or feet.

[0063] The after-sun repair is to improve the skin erythema after sun exposure.

[0064] The fourth aspect of the present invention provides a use of the sunscreen cosmetic in whitening or anti-ultraviolet rays.

[0065] The present invention has the following beneficial effects:

[0066] (1) The sunscreen cosmetics of the present application have little irritation to the skin and reduce allergenicity, thereby ensuring the whitening, sun protection and UV resistance of the sunscreen cosmetics while having good air permeability and skin-friendliness.

[0067] (2) The active sunscreen ingredients include Scutellaria baicalensis extract and Coltsfoot extract as well as nano-zinc oxide and nano-titanium dioxide, achieving both physical and chemical sunscreen.

[0068] (3) Adding Scutellaria baicalensis extract and Coltsfoot extract to the active ingredients of sunscreen cosmetics can help improve skin erythema after sun exposure. DETAILED DESCRIPTION

[0069] The present invention is further described below in conjunction with the embodiments. The following description is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any technician familiar with the profession may use the above disclosed technical content to change it into an equivalent embodiment with equivalent changes. Any simple modification or equivalent change made to the following embodiments based on the technical essence of the present invention without departing from the content of the present invention falls within the protection scope of the present invention.

[0070] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0071] Unless otherwise defined, the reagents used in the present invention are commercially available.

[0072] Example 1

[0073] 1. Sunscreen cosmetic formula: The raw materials, calculated by mass percentage, include: 0.6% scutellaria baicalensis extract, 0.6% coltsfoot extract, 6% nano zinc oxide, 5% nano titanium dioxide, 6% ethyl methoxycinnamate, 5% glycerin, 0.5% stearyl alcohol, 5% vaseline, 4% propylene glycol, 2% cetearyl glucoside, 4% cetearyl alcohol, 0.8% phenoxyethanol, and the balance is deionized water.

[0074] 2. The specific steps of the preparation method are as follows:

[0075] S1: Use appropriate amount of glycerin to disperse the nano zinc oxide and nano titanium dioxide in the formula separately in advance;

[0076] S2: deionized water, remaining glycerin, propylene glycol, petrolatum, stearyl alcohol, phenoxyethanol, ethyl methoxycinnamate, cetearyl glucoside and cetearyl alcohol in the formula were mixed and heated in a water bath at 80° C. and homogenized and stirred for 30 min to obtain solution A;

[0077] S3: At a temperature of 30°C, slowly add the dispersed nano zinc oxide and nano titanium dioxide into the solution A obtained in S2, and stir homogenously for 30 minutes to obtain solution B;

[0078] S4: Add the Scutellaria baicalensis extract and the Coltsfoot extract in the formula to the solution B obtained in S3 and stir homogenously for 20 minutes.

[0079] S5: vacuum degassing and discharging the material, and then letting it stand to obtain the sunscreen cosmetics.

[0080] Example 2

[0081] 1. Sunscreen cosmetic formula: The raw materials, calculated by mass percentage, include: 0.6% scutellaria baicalensis extract, 0.4% coltsfoot extract, 6% nano zinc oxide, 5% nano titanium dioxide, 6% ethyl methoxycinnamate, 5% glycerin, 0.5% stearyl alcohol, 5% vaseline, 4% propylene glycol, 2% cetearyl glucoside, 4% cetearyl alcohol, 0.8% phenoxyethanol, and the balance is deionized water.

[0082] 2. The preparation method is the same as that in Example 1.

[0083] Example 3

[0084] 1. Sunscreen cosmetic formula: The raw materials, calculated by mass percentage, include: 0.6% scutellaria baicalensis extract, 0.3% coltsfoot extract, 6% nano zinc oxide, 5% nano titanium dioxide, 6% ethyl methoxycinnamate, 5% glycerin, 0.5% stearyl alcohol, 5% vaseline, 4% propylene glycol, 2% cetearyl glucoside, 4% cetearyl alcohol, 0.8% phenoxyethanol, and the balance is deionized water.

[0085] 2. The preparation method is the same as that in Example 1.

[0086] Example 4

[0087] 1. Sunscreen cosmetic formula: The raw materials, calculated by mass percentage, include: 0.6% scutellaria baicalensis extract, 0.2% coltsfoot extract, 6% nano zinc oxide, 5% nano titanium dioxide, 6% ethyl methoxycinnamate, 5% glycerin, 0.5% stearyl alcohol, 5% vaseline, 4% propylene glycol, 2% cetearyl glucoside, 4% cetearyl alcohol, 0.8% phenoxyethanol, and the balance is deionized water.

[0088] 2. The preparation method is the same as that in Example 1.

[0089] Example 5

[0090] 1. Sunscreen cosmetic formula: The raw materials, calculated by mass percentage, include: 0.1% scutellaria baicalensis extract, 1% coltsfoot extract, 1% nano zinc oxide, 1% nano titanium dioxide, 12% ethyl methoxycinnamate, 13% glycerin, 1% stearyl alcohol, 15% vaseline, 10% propylene glycol, 1% cetearyl glucoside, 1% cetearyl alcohol, 5% phenoxyethanol, and the balance is deionized water.

[0091] 2. The specific steps of the preparation method are as follows:

[0092] S1: Use appropriate amount of glycerin to disperse nano zinc oxide and nano titanium dioxide in the formula separately in advance;

[0093] S2: deionized water, remaining glycerin, propylene glycol, petrolatum, stearyl alcohol, phenoxyethanol, ethyl methoxycinnamate, cetearyl glucoside and cetearyl alcohol in the formula were mixed and heated in a water bath at 85° C. and homogenized and stirred for 10 min to obtain solution A;

[0094] S3: At a temperature of 40°C, slowly add the dispersed nano zinc oxide and nano titanium dioxide into the solution A obtained in S2, and stir homogenously for 10 minutes to obtain solution B;

[0095] S4: Add the Scutellaria baicalensis extract and the Coltsfoot extract in the formula to the solution B obtained in S3 and stir homogenously for 10 minutes.

[0096] S5: vacuum degassing and discharging the material, and then letting it stand to obtain the sunscreen cosmetics.

[0097] Example 6

[0098] 1. Sunscreen cosmetic formula: The raw materials, calculated by mass percentage, include: 1% scutellaria baicalensis extract, 0.1% coltsfoot extract, 10% nano zinc oxide, 1% nano titanium dioxide, 1% ethyl methoxycinnamate, 1% glycerin, 0.1% stearyl alcohol, 1% vaseline, 1% propylene glycol, 10% cetearyl glucoside, 10% cetearyl alcohol, 0.1% phenoxyethanol, and the balance is deionized water.

[0099] 2. The specific steps of the preparation method are as follows:

[0100] S1: Pre-disperse nano zinc oxide and nano titanium dioxide separately with appropriate amount of glycerol;

[0101] S2: deionized water, remaining glycerin, propylene glycol, petrolatum, stearyl alcohol, phenoxyethanol, ethyl methoxycinnamate, cetearyl glucoside and cetearyl alcohol were mixed, heated in a water bath at 83° C., and homogenized and stirred for 25 min to obtain solution A;

[0102] S3: At a temperature of 35°C, slowly add the dispersed nano zinc oxide and nano titanium dioxide to the solution A obtained in S2, and stir homogenously for 30 minutes to obtain solution B;

[0103] S4: Add the Scutellaria baicalensis extract and the Coltsfoot extract to the solution B obtained in S3 and stir homogenously for 15 minutes.

[0104] S5: vacuum degassing and discharging the material, and then letting it stand to obtain the sunscreen cosmetics.

[0105] Example 7

[0106] 1. Sunscreen cosmetic formula: The raw materials, calculated by mass percentage, include: 0.5% scutellaria baicalensis extract, 0.1% coltsfoot extract, 5% nano zinc oxide, 10% nano titanium dioxide, 10% ethyl methoxycinnamate, 5% glycerin, 5% stearyl alcohol, 5% vaseline, 12% propylene glycol, 10% cetearyl glucoside, 1% cetearyl alcohol, 1% phenoxyethanol, and the balance is deionized water.

[0107] 2. The preparation method is the same as Example 6.

[0108] Example 8

[0109] 1. Sunscreen cosmetic formula: The raw materials, calculated by mass percentage, include: 0.1% scutellaria baicalensis extract, 0.1% coltsfoot extract, 5% nano zinc oxide, 1% nano titanium dioxide, 1% ethyl methoxycinnamate, 8% glycerin, 0.5% stearyl alcohol, 5% vaseline, 5% propylene glycol, 1% cetearyl glucoside, 5% cetearyl alcohol, 3% phenoxyethanol, and the balance is deionized water.

[0110] 2. The specific steps of the preparation method are as follows:

[0111] S1: Use appropriate amount of glycerin to disperse the nano zinc oxide and nano titanium dioxide in the formula separately in advance;

[0112] S2: deionized water, remaining glycerin, propylene glycol, petrolatum, stearyl alcohol, phenoxyethanol, ethyl methoxycinnamate, cetearyl glucoside and cetearyl alcohol in the formula were mixed and heated in a water bath at 83° C. and homogenized and stirred for 20 min to obtain solution A;

[0113] S3: At a temperature of 30°C, slowly add the dispersed nano zinc oxide and nano titanium dioxide into the solution A obtained in S2, and stir homogenously for 15 minutes to obtain solution B;

[0114] S4: Add the Scutellaria baicalensis extract and the Coltsfoot extract in the formula to the solution B obtained in S3 and stir homogenously for 30 minutes.

[0115] S5: vacuum degassing and discharging the material, and then letting it stand to obtain the sunscreen cosmetics.

[0116] Example 9

[0117] 1. Sunscreen cosmetic formula: The raw materials include, by mass percentage, 0.6% scutellaria baicalensis extract, 0.2% coltsfoot extract, 6% nano zinc oxide, 5% nano titanium dioxide, 6% ethyl methoxycinnamate, and the balance is deionized water.

[0118] 2. The specific steps of the preparation method are as follows: disperse nano zinc oxide and nano titanium dioxide; heat and homogenize and stir for 30 minutes in a water bath at 80°C to prepare solution A containing ethyl methoxycinnamate; after cooling to 40°C, add the dispersed nano zinc oxide and nano titanium dioxide to solution A and homogenize and stir for 10 minutes to obtain solution B; add scutellaria baicalensis extract and coltsfoot extract to solution B and homogenize and stir for 15 minutes.

[0119] Example 10

[0120] 1. Sunscreen cosmetic formula: The raw materials include, by mass percentage: 1% scutellaria baicalensis extract, 0.1% coltsfoot extract, 10% nano zinc oxide, 1% nano titanium dioxide, 12% ethyl methoxycinnamate, and the balance is deionized water.

[0121] 2. The specific steps of the preparation method are as follows: disperse nano zinc oxide and nano titanium dioxide; heat and homogenize and stir for 20 minutes in a water bath at 85°C to prepare solution A containing ethyl methoxycinnamate; after cooling to 30°C, add the dispersed nano zinc oxide and nano titanium dioxide to solution A and homogenize and stir for 10 minutes to obtain solution B; add scutellaria baicalensis extract and coltsfoot extract to solution B and homogenize and stir for 30 minutes.

[0122] Embodiment 11

[0123] 1. Sunscreen cosmetic formula: The raw materials include, by mass percentage, 0.1% scutellaria baicalensis extract, 1% coltsfoot extract, 5% nano zinc oxide, 10% nano titanium dioxide, 1% ethyl methoxycinnamate, and the balance is deionized water.

[0124] 2. The preparation method is the same as Example 10.

[0125] Example 12

[0126] 1. Sunscreen cosmetic formula: The raw materials include, by mass percentage, 0.5% scutellaria baicalensis extract, 0.6% coltsfoot extract, 1% nano zinc oxide, 6% nano titanium dioxide, 10% ethyl methoxycinnamate, and the balance is deionized water.

[0127] 2. The preparation method is the same as Example 10.

[0128] Embodiment 13

[0129] Twenty male volunteers aged between 18 and 35 were recruited, and all volunteers had normal skin.

[0130] The back of each volunteer was divided into 6 areas on average, and the sunscreen cosmetics prepared in Examples 1-4 and the comparative sunscreen cosmetics were evenly applied to 5 areas, and the remaining area was not coated with sunscreen cosmetics as a blank control. Six erythema were induced by a solar simulator. The skin erythema index was recorded. The comparative sunscreen cosmetics did not contain scutellaria baicalensis extract and coltsfoot extract, and its formula included, by mass percentage: 6% nano zinc oxide, 5% nano titanium dioxide, 6% ethyl methoxycinnamate, 5% glycerol, 0.5% octadecyl alcohol, 5% vaseline, 4% propylene glycol, 2% cetearyl glucoside, 4% cetearyl alcohol, 0.8% phenoxyethanol, and the balance was deionized water. The preparation method is the same as in Example 1.

[0131] Improvement of skin erythema index (%) = [(skin erythema index of the blank group - skin erythema index of the experimental group)] / skin erythema index of the blank group * 100%.

[0132] The results are shown in Table 1, which shows the average results of the test of 20 volunteers. The comparison of the sunscreen cosmetics of Examples 1-4 and the comparative sunscreen cosmetics shows that the sunscreen cosmetics added with scutellaria extract and coltsfoot extract can significantly increase the improvement of skin erythema, effectively reduce sunburn of the skin, and effectively repair the skin. The sunscreen effect of the sunscreen cosmetics of each embodiment is significantly better than that of the comparative sunscreen cosmetics. When the mass ratio of the addition amount of scutellaria extract and coltsfoot extract is 2:1, the sunscreen repair effect is the best.

[0133] Table 1

[0134] Group Improvement of skin erythema index after sun exposure (%) Sunscreen cosmetics of Example 1 60.5 Sunscreen cosmetics of Example 2 61.3 Sunscreen cosmetics of Example 3 65.6 Sunscreen cosmetics of Example 4 62.7 Comparative sunscreen cosmetics 40.7

[0135] 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.

[0136] 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 cosmetic, characterized in that: The raw materials of the sunscreen cosmetics include, by mass percentage, 0.1%-1% of scutellaria baicalensis extract, 0.1%-1% of coltsfoot extract, 1%-10% of nano zinc oxide, 1%-10% of nano titanium dioxide and 1%-12% of ethyl methoxycinnamate.

2. The sunscreen cosmetic according to claim 1, characterized in that: The extraction method of the scutellaria baicalensis extract or coltsfoot extract is independently selected from one or more of solvent extraction, immersion, acid hydrolysis, enzymatic hydrolysis, ultrasonic extraction, microwave extraction and supercritical fluid extraction.

3. The sunscreen cosmetic according to claim 1, characterized in that: The raw materials of the sunscreen cosmetics also include one or more of moisturizers, emulsifiers, emulsion stabilizers, preservatives, thickeners or flavors; Preferably, the moisturizing agent comprises one or more of glycerol, propylene glycol, butylene glycol, xylitol, sorbitol, lactic acid or its salt, provitamin B5, silk amino acid, maltotetraose, inulin, avena sativa, yeast extract, hyaluronic acid, chitin, trehalose, raffinose, maltotetraose, pullulan, tremella polysaccharide, β-glucan, γ-polyglutamate sodium, sour bean seed polysaccharide, sclerotium gum, vaseline, white mineral oil, olive oil, jojoba oil, shea butter, macadamia oil or ceramide; Preferably, the emulsifier includes one or more of a nonionic emulsifier (e.g., steareth-2, steareth-21, PEG-30, PEG-100, polyglyceryl-10 stearate, polyglyceryl-10 stearate, sorbitan olivate, polyglyceryl-3 polyricinoleate, glyceryl stearate, cetearyl olivate, cetearyl glucoside), a cationic emulsifier (e.g., cetyltrimethylammonium bromide, cetylbenzyldimethylammonium bromide, cetrimonium chloride, stearyltrimethylammonium chloride, palmitamidopropyltrimethylammonium chloride), an anionic emulsifier (e.g., sodium lauryl sulfate, ammonium lauryl sulfate, sodium lauryl ether sulfate, sodium cetearyl sulfate, sodium stearoyl glutamate), a zwitterionic emulsifier (e.g., lecithin, betaine, amino acid) or a polymer emulsifier (e.g., polysaccharides, celluloses, polyoxyethylenes, polyacrylic acids, natural gums and modified products thereof); Preferably, the emulsion stabilizer includes gum arabic, xanthan gum, dehydrogenated xanthan gum, sclerotium gum, carrageenan, carbomer, gellan gum, polyacrylate, polyacrylate-13, polyacrylate cross-linked polymer-5, hydroxyethyl acrylate / sodium acryloyldimethyl taurate copolymer, ammonium acryloyldimethyl taurate / VP copolymer, acrylic acid (ester) / C 10-30 One or more of alkyl acrylate crosspolymer, sodium acrylate / sodium acryloyldimethyl taurate copolymer, lecithin, glycosides, cellulose, cetearyl alcohol, polysorbate-80, sorbitan oleate, polysorbate-60 or polysorbate-20; Preferably, the preservative includes one or more of phenoxyethanol, parabens, benzoic acid and its salts and esters, sorbic acid, salicylic acid and its salts, polyaminopropyl biguanide, DMDM ​​hydantoin, imidazolidinyl urea, diimidazoles urea, isothiazolinone or iodopropynyl butyl carbamate; Preferably, the thickener includes inorganic salts (such as sodium chloride, potassium chloride, ammonium chloride, monoethanolamine chloride, diethanolamine chloride, sodium sulfate, sodium phosphate, disodium phosphate and pentasodium triphosphate), fatty alcohols / acids (such as lauryl alcohol, myristyl alcohol, stearyl alcohol, decanol, hexanol, octanol, linoleic acid, linolenic acid, myristic acid, stearic acid), alkanolamides (such as coconut diethanolamide, coconut monoethanolamide, coconut monoisopropanolamide, isostearyl diethanolamide, linoleyl diethanolamide, myristic diethanolamide, oil diethanolamide, palm monoethanolamide, castor oil monoethanolamide , sesame diethanolamide), ethers (e.g., cetyl alcohol polyoxyethylene ether, isocetyl alcohol polyoxyethylene ether, lauryl alcohol polyoxyethylene ether), esters (e.g., PEG-120 methyl glucose dioleate, PEG-150 pentaerythritol tetrastearate, PEG-160 sorbitan triisostearate), celluloses (e.g., cellulose, cellulose gum, carboxymethyl hydroxyethyl cellulose, cetyl hydroxyethyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, carboxymethyl cellulose), or polyacrylic acids (e.g., polyacrylic acid, acrylates / C 10-30 One or more of alkyl acrylate cross-linked polymer, sodium acrylate / ethylene isodecanoate cross-linked polymer, acrylate / VA cross-linked polymer).

4. The sunscreen cosmetic according to claim 1, characterized in that: The raw materials of the sunscreen cosmetics include, by mass percentage, 0.1%-1% scutellaria baicalensis extract, 0.1%-1% coltsfoot extract, 1%-10% nano zinc oxide, 1%-10% nano titanium dioxide, 1%-12% ethyl methoxycinnamate, 1%-13% glycerol, 0.1%-5% octadecyl alcohol, 1%-15% vaseline, 1%-12% propylene glycol, 1%-10% cetearyl glucoside, 1%-10% cetearyl alcohol, 0.1%-5% phenoxyethanol, and the balance water.

5. The sunscreen cosmetic according to claim 1, characterized in that: The mass ratio of the scutellaria baicalensis extract to the coltsfoot extract in the raw materials of the sunscreen cosmetics is (1-3):1, preferably (1.8-2.5):

1.

6. The sunscreen cosmetic according to claim 1, characterized in that: The raw materials of the sunscreen cosmetics include, by mass percentage, 0.5%-0.7% of scutellaria baicalensis extract, 0.2%-0.6% of coltsfoot extract, 1%-10% of nano zinc oxide, 1%-10% of nano titanium dioxide, 1%-12% of ethyl methoxycinnamate, 1%-13% of glycerol, 0.1%-5% of octadecyl alcohol, 1%-15% of vaseline, 1%-12% of propylene glycol, 1%-10% of cetearyl glucoside, 1%-10% of cetearyl alcohol, 0.1%-5% of phenoxyethanol, and the balance of water.

7. The sunscreen cosmetic according to claim 1, characterized in that: The raw materials of the sunscreen cosmetics include, by mass percentage, 0.5%-0.7% of scutellaria baicalensis extract, 0.2%-0.6% of coltsfoot extract, 4%-8% of nano zinc oxide, 3%-7% of nano titanium dioxide, 4%-8% of ethyl methoxycinnamate, 3%-7% of glycerol, 0.3%-0.8% of octadecyl alcohol, 3%-7% of vaseline, 2%-6% of propylene glycol, 1%-3% of cetearyl glucoside, 2%-6% of cetearyl alcohol, 0.1%-2% of phenoxyethanol, and the balance of water.

8. The sunscreen cosmetic according to claim 1, characterized in that: The formulation types of the sunscreen cosmetics include lotion, cream, spray, gel or ointment.

9. A method for preparing the sunscreen cosmetic according to any one of claims 1 to 8, characterized in that: The preparation method of the sunscreen cosmetics comprises: dispersing nano zinc oxide and nano titanium dioxide; preparing solution A containing ethyl methoxycinnamate; adding the dispersed nano zinc oxide and nano titanium dioxide into solution A and homogenizing and stirring to obtain solution B; adding scutellaria baicalensis extract and coltsfoot extract into solution B and homogenizing and stirring.

10. The preparation method according to claim 9, characterized in that: The preparation method comprises: S1: Pre-disperse nano zinc oxide and nano titanium dioxide separately with appropriate amount of glycerol; S2: deionized water, remaining glycerin, propylene glycol, petrolatum, stearyl alcohol, phenoxyethanol, ethyl methoxycinnamate, cetearyl glucoside and cetearyl alcohol are homogenized and stirred under heating to obtain solution A; S3: adding the dispersed nano zinc oxide and nano titanium dioxide to the solution A obtained in S2, and stirring homogeneously to obtain solution B; S4: adding the scutellaria baicalensis extract and coltsfoot extract to the solution B obtained in S3 and stirring homogeneously; S5: The material is discharged through vacuum degassing and left to stand to obtain sunscreen cosmetics.