Skin care composition as well as preparation method and application thereof

Abstract

The invention relates to the technical field of cosmetics, in particular to a skin care composition and a preparation method and application thereof. The skin care composition provided by the invention comprises tourmaline, hydrophobic zinc oxide, grease and a dispersing agent, the mass percent of the hydrophobic zinc oxide in the skin care composition is 50%-90%, and the mass percent of the tourmaline in the skin care composition is 1%-45%. In research, it is accidentally found that after tourmaline is specially mixed with a superfine physical sun-screening agent zinc oxide subjected to hydrophobic surface treatment in a small proportion, the remarkable synergistic effect on ultraviolet absorption of the zinc oxide can be achieved, and the cell repairing effect of the composition can also be effectively improved. Meanwhile, the composition is in a flowable slurry state, can be very conveniently added into a final cosmetic formula, and is good in stability.

Description

Technical Field

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

[0002] Tourmaline, also known as tourmaline, is a mineral material with far-infrared emission capabilities and has been widely used in fabrics or accessories. Since tourmaline can emit far-infrared rays, it can theoretically help the functionality of the human body and skin. In existing research, a small number of patents have added tourmaline as a component of cosmetics into the formula. For example, it is dispersed into the final formula system in the form of tiny powders through grinding and other means to improve the sensory evaluation of the product. Nevertheless, as a natural mineral, tourmaline is limited by its own physical and chemical properties. The mixed dispersion system containing tourmaline is very prone to problems such as excessive heavy metal content, poor stability, and poor fluidity, which limits the application of tourmaline in the field of cosmetics.

[0003] In view of this, the present invention is proposed. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a skin care composition containing tourmaline and a preparation method and application thereof.

[0005] Specifically, the technical solution of the present invention is as follows: In a first aspect, the present invention provides a skin care composition, comprising tourmaline, hydrophobic zinc oxide, oil and dispersant, wherein the mass percentage of the hydrophobic zinc oxide in the skin care composition is 50% to 90%, and the mass percentage of the tourmaline in the skin care composition is 1% to 45%.

[0006] Preferably, the mass percentage of the tourmaline in the skin care composition is 1% to 35%; more preferably 1% to 25%; more preferably 1% to 10%.

[0007] Preferably, the oil is selected from esters that are liquid at room temperature; preferably, the mass percentage of the esters that are liquid at room temperature in the skin care composition is 10% to 40%.

[0008] More preferably, the ester that is liquid at room temperature is neopentyl glycol diheptanoate.

[0009] Preferably, the dispersant is an alkyl polyglycerol ester dispersant; more preferably, the mass percentage of the alkyl polyglycerol ester dispersant in the skin care composition is 1% to 10%.

[0010] Preferably, the alkyl polyglycerol ester dispersant is polyglyceryl-6 polyricinoleate, and the mass percentage of the polyglyceryl-6 polyricinoleate in the skin care composition is 2% to 5%.

[0011] Preferably, the preparation method of the skin care composition comprises the following steps: mixing the oil and the dispersant, adding the hydrophobic zinc oxide and the tourmaline under stirring, and continuing stirring for >20 min.

[0012] Preferably, the stirring speed is 2500~10000 rpm.

[0013] Preferably, the hydrophobic zinc oxide and the tourmaline are in powder form; preferably, the particle size of the hydrophobic zinc oxide powder is ≤200 nm, and the particle size of the tourmaline powder is 1000-5000 mesh.

[0014] In a second aspect, the present invention provides a method for preparing the aforementioned skin care composition, comprising the following steps: mixing the oil and the dispersant, adding the hydrophobic zinc oxide and the tourmaline under stirring, and continuing stirring for >20 minutes.

[0015] Preferably, the stirring speed is 2500-5000 rpm.

[0016] Preferably, the hydrophobic zinc oxide and the tourmaline are in powder state.

[0017] Preferably, the particle size of the hydrophobic zinc oxide powder is ≤200 nm, and the particle size of the tourmaline powder is 1000 mesh to 5000 mesh.

[0018] In a third aspect, the present invention provides application of the aforementioned skin care composition or the aforementioned preparation method in the production of cosmetics.

[0019] Preferably, the application comprises: adding the skin care composition to a cosmetic formula, the mass percentage of the skin care composition in the cosmetic formula is 1% to 30%.

[0020] Beneficial effects: The present invention provides a skin care composition and a preparation method and application thereof. The skin care composition provided by the present invention comprises tourmaline, hydrophobic zinc oxide, grease and dispersant, wherein the mass percentage of the hydrophobic zinc oxide in the skin care composition is 50% to 90%, and the mass percentage of the tourmaline in the skin care composition is 1% to 45%. The present invention unexpectedly discovered in the research that when tourmaline is specially mixed with fine physical sunscreen zinc oxide with hydrophobic surface treatment in a small proportion, not only can the ultraviolet absorption of zinc oxide be significantly enhanced, but also the cell repair effect of the combination can be effectively improved. At the same time, the composition itself is in a fluid slurry state, which can be very conveniently added to the final cosmetic formula and has good stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be described below.

[0022] Figure 1 The UV absorption curve test results of four samples in Experimental Example 2 of the present invention are shown in FIG. DETAILED DESCRIPTION

[0023] The invention provides a skin care composition and a preparation method and application thereof.

[0024] Firstly, the present invention provides a skin care composition, which comprises tourmaline, hydrophobic zinc oxide, oil and dispersant.

[0025] In the present invention, the mass percentage of the hydrophobic zinc oxide in the skin care composition is 50% to 90%.

[0026] Optionally, the mass percentage of the hydrophobic zinc oxide in the skin care composition can be 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, or a value within the interval formed by any two of the above values.

[0027] In the present invention, the mass percentage of the tourmaline in the skin care composition is 1% to 45%.

[0028] Optionally, the mass percentage of the tourmaline in the skin care composition can be 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, or a value within the interval formed by any two of the above values.

[0029] The present invention uses a certain proportion of inorganic sunscreen zinc oxide with a micronized hydrophobic surface treatment to mix with tourmaline. In the mixture, the hydrophobized zinc oxide accounts for 50-90%, the tourmaline accounts for preferably 1-10%, and the rest is oil and dispersant. The present invention preferably controls the content of tourmaline to not exceed 10%, and this limit can ensure that after the composition is applied to the final cosmetic product formula, the heavy metal content of the final cosmetic formula is controlled at an acceptable level.

[0030] In the present invention, the mixture of hydrophobic zinc oxide and tourmaline needs to be specially mixed with dispersants such as oil esters and alkyl polyglycerol esters to achieve the desired technical requirements.

[0031] In the present invention, the oil can be selected from one or a combination of the following fatty substances.

[0032] (1) Hydrocarbon oils derived from animals, such as fully hydrogenated squalene.

[0033] (2) Hydrocarbon oils derived from plants, such as liquid triglycerides containing fatty acids of 4 to 10 carbon atoms, such as triglycerides of heptanoic acid or caprylic acid; or triglycerides derived from sunflower, corn soybean, gourd, grape seed, sesame, hazelnut, apricot, macadamia, castor or avocado oil, triglycerides of caprylic / capric acid, jojoba oil, or candy fruit oil.

[0034] (3) Synthetic esters and ethers, in particular esters or ethers of fatty acids such as oils of the formula R1COOR2 and R1OR2, in which R1 represents a fatty acid radical containing from 8 to 29 carbon atoms and R2 represents a branched or unbranched hydrocarbon chain containing from 3 to 30 carbon atoms, for example isononyl isononanoate, isopropyl myristate, 2-ethylhexyl palmitate, 2-octyldodecyl stearate, 2-octyldodecyl erucate or isostearyl isostearate; hydroxy esters, for example isostearyl lactylate, octyl hydroxystearate, octyl lauroyl hydroxystearate, diisostearyl malate, triisocetyl citrate or triisocetyl heptanoate, caprylic or capric esters of fatty alcohols; polyol esters, for example propylene glycol dicaprylate, neopentyl glycol diheptanoate and diethylene glycol diisononanoate; and pentaerythritol esters, for example tetraisostearate of pentaerythritol.

[0035] (4) Straight-chain or branched hydrocarbons of mineral or synthetic origin, such as volatile or non-volatile liquid paraffins and their derivatives, liquid petrolatum, polydecene or hydrogenated polyisobutene, fatty alcohols containing 8 to 26 carbon atoms, such as cetyl alcohol, octadecanol and their mixtures (cetearyl alcohol), octyldodecanol, 2-butyloctanol, 2-hexyldecanol, 2-undecylpentadecanol, oleyl alcohol or linoleyl alcohol, etc.

[0036] (5) Silicone oils, for example volatile or non-volatile polymethylsiloxanes (PDMS) which are liquid or pasty at room temperature and contain a linear or cyclic silicon chain, in particular cyclopolydimethylsiloxanes such as cyclohexasiloxane; polydimethylsiloxanes containing pendant alkyl, alkoxy or phenyl groups or alkyl, alkoxy or phenyl groups having 2 to 24 carbon atoms at the end of the silicon chain; or phenylated silicones, for example phenyl trimethicone, phenyl dimethicone, phenyl trimethylsiloxydiphenylsiloxane, diphenyl dimethicone, diphenylmethyldiphenyl trisiloxane, (2-phenylethyl) trimethylsiloxysilicate and polymethylphenylsiloxane.

[0037] In a more preferred embodiment of the present invention, the oil can be neopentyl glycol diheptanoate.

[0038] More preferably, the mass percentage of the oil such as neopentyl glycol diheptanoate in the skin care composition is 10% to 40%.

[0039] Optionally, the mass percentage of the oil such as neopentyl glycol diheptanoate in the skin care composition can be 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, or a value within the interval formed by any two of the above values.

[0040] Preferably, the dispersant is an alkyl polyglycerol ester dispersant; more preferably, the mass percentage of the alkyl polyglycerol ester dispersant in the skin care composition is 1% to 10%.

[0041] Optionally, the mass percentage of the alkyl polyglycerol ester dispersant in the skin care composition can be 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, or a value within the interval formed by any two of the above values.

[0042] Preferably, the alkyl polyglycerol ester dispersant is polyglyceryl-6 polyricinoleate, and the mass percentage of the polyglyceryl-6 polyricinoleate in the skin care composition is 2% to 5%.

[0043] Optionally, the mass percentage of the polyglyceryl-6 polyricinoleate in the skin care composition can be 2.0%, 2.5%, 3.0%, 3.5%, 4.0%, 4.5%, 5.0%, or a value within the interval formed by any two of the above values.

[0044] The present invention does not specifically limit the sources of the above-mentioned raw materials such as tourmaline, hydrophobic zinc oxide, neopentyl glycol diheptanoate or polyglycerol-6 polyricinoleate, and any conventional commercial source in the art can be used. In a more specific embodiment provided by the present invention, the tourmaline comes from Shanghai Zibang Biopharmaceutical Co., Ltd.; the hydrophobic zinc oxide is zinc oxide treated with triethoxyoctylsilane, the product model is BINSUNPRO MZ200, from Shanghai Zibang Biopharmaceutical Co., Ltd.; the neopentyl glycol diheptanoate product model is BINESTER SILK, from Shanghai Zibang Biopharmaceutical Co., Ltd.; the polyglycerol-6 polyricinoleate comes from Shanghai Zibang Biopharmaceutical Co., Ltd.

[0045] Preferably, the preparation method of the skin care composition comprises the following steps: mixing the oil and the dispersant, adding the hydrophobic zinc oxide and the tourmaline under stirring, and continuing stirring for >20 min.

[0046] In the present invention, the stirring speed is preferably 2500-10000 rpm, more preferably 3000-5000 rpm, and more preferably 3000-4000 rpm.

[0047] In the present invention, the stirring time is preferably 25-60 min, more preferably 30-40 min, more preferably 30 min.

[0048] In the present invention, the hydrophobic zinc oxide and the tourmaline are in powder form. The particle size of the hydrophobic zinc oxide powder is preferably ≤200nm, more preferably 100-150nm; the particle size of the tourmaline powder is preferably 1000-5000 mesh, more preferably 3000 mesh.

[0049] Secondly, the present invention provides a method for preparing the aforementioned skin care composition, comprising the following steps: mixing the oil and the dispersant, adding the hydrophobic zinc oxide and the tourmaline under stirring, and continuing stirring for >20 minutes.

[0050] Preferably, the stirring speed is 2500~10000 rpm.

[0051] Preferably, the hydrophobic zinc oxide and the tourmaline are in powder state.

[0052] Preferably, the particle size of the hydrophobic zinc oxide powder is ≤200 nm, and the particle size of the tourmaline powder is 1000-5000 mesh.

[0053] The present invention can significantly enhance the ultraviolet absorption effect and cell repair effect of zinc oxide by mixing tourmaline with an inorganic sunscreen represented by zinc oxide in a relatively special manner to prepare pulp.

[0054] In a more specific embodiment provided by the present invention, the preparation method is: after 15 parts of neopentyl glycol diheptanoate and 3 parts of polyglycerol-6 polyricinoleate are mixed evenly, 77 parts of hydrophobic zinc oxide powder and 5 parts of tourmaline powder are added under stirring, and then the mixed slurry is dispersed at 3000 rpm for half an hour at room temperature using a multi-purpose machine for grinding, dispersing and stirring. The mixed slurry has good fluidity and is easy to use later. The mixed slurry can be added to the downstream cosmetic formula in any proportion between 1-30% as needed.

[0055] In addition, the present invention also provides the use of the above-mentioned skin care composition or the above-mentioned preparation method in the production of cosmetics.

[0056] Preferably, the application comprises: adding the skin care composition to a cosmetic formula, the mass percentage of the skin care composition in the cosmetic formula is 1% to 30%.

[0057] Optionally, the mass percentage of the skin care composition in the cosmetic formula is 1%, 5%, 10%, 15%, 20%, 25%, 30%, or a value within the interval formed by any two of the above values.

[0058] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] The endpoints and any values ​​of the ranges disclosed in this specification are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "specific implementations", or "some specific implementations" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0061] In the examples provided in this specification, if no specific techniques or conditions are specified, the techniques or conditions described in the literature in this field or the product instructions are used. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased through regular channels.

[0062] Example 1

[0063] This embodiment provides a skin care composition, the formula of which is: 77 parts of hydrophobic zinc oxide, 5 parts of tourmaline, 15 parts of neopentyl glycol diheptanoate, and 3 parts of polyglyceryl-6 polyricinoleate.

[0064] This embodiment provides a method for preparing the above-mentioned skin care composition, comprising the following steps: After neopentyl glycol diheptanoate and polyglycerol-6 polyricinoleate are uniformly mixed, hydrophobic zinc oxide powder and tourmaline powder are added under stirring, and then a sanding, dispersing and stirring multi-purpose machine is used to disperse the mixture at 3000 rpm for half an hour at room temperature to obtain the mixed slurry.

[0065] Example 2

[0066] This embodiment provides a skin care composition, the formula of which is: 78.85 parts of hydrophobic zinc oxide, 4.15 parts of tourmaline, 14 parts of neopentyl glycol diheptanoate, and 3 parts of polyglyceryl-6 polyricinoleate.

[0067] The preparation method of the skin care composition described in this embodiment is the same as that of Example 1.

[0068] Example 3

[0069] This embodiment provides a skin care composition, the formula of which is: 80 parts of hydrophobic zinc oxide, 5 parts of tourmaline, 13 parts of neopentyl glycol diheptanoate, and 2 parts of polyglyceryl-6 polyricinoleate.

[0070] The preparation method of the skin care composition described in this embodiment is the same as that of Example 1.

[0071] Example 4

[0072] This embodiment provides a skin care composition, the formula of which is: 50 parts of hydrophobic zinc oxide, 10 parts of tourmaline, 39 parts of neopentyl glycol diheptanoate, and 1 part of polyglyceryl-6 polyricinoleate.

[0073] The preparation method of the skin care composition described in this embodiment is the same as that of Example 1.

[0074] Comparative Example 1

[0075] This comparative example provides a skin care composition, the formula of which is: 61.75 parts of hydrophobic zinc oxide, 3.25 parts of tourmaline, and 35 parts of neopentyl glycol diheptanoate.

[0076] The preparation method of the skin care composition described in this comparative example is the same as that of Example 1.

[0077] Experimental Example 1

[0078] In this experimental example, the products provided in Example 2 and Comparative Example 1 were used as test samples, and the viscosity (RV6 / 10rpm) and stability (-15°C) of the test samples were respectively investigated. The results are shown in Table 1.

[0079]

[0080] It can be seen from Table 1 that no polyglycerol-6 polyricinoleate is added to the product formula of Comparative Example 1, the solid content of the oil slurry is very low, the viscosity is too high, and the stability is also very poor.

[0081] Experimental Example 2

[0082] In this experimental example, the ultraviolet absorption curves and cell repair effects of four samples, namely, FIR-S (30% dilution of the skin care composition of Example 1), ZnO+tourmaline, ZnO, and tourmaline, were tested.

[0083] (I) The composition and preparation methods of the four samples are as follows.

[0084] FIR-S: Referring to the method of Example 1, 28.55 g of hydrophobic zinc oxide, 1.45 g of tourmaline, 1.09 g of polyglycerol-6 polyricinoleate and 5.08 g of neopentyl glycol diheptanoate were mixed, and then 63.83 g of neopentyl glycol diheptanoate was mixed.

[0085] Hydrophobic zinc oxide + tourmaline: 28.55 g of hydrophobic zinc oxide and 1.45 g of tourmaline were dispersed in 70 g of neopentyl glycol diheptanoate.

[0086] Hydrophobic zinc oxide: 30 g of hydrophobic zinc oxide was dispersed in 70 g of neopentyl glycol diheptanoate.

[0087] Tourmaline: 30 g of tourmaline was dispersed in 70 g of neopentyl glycol diheptanoate.

[0088] (II) UV absorption curve test method and results.

[0089] After the above samples were diluted 300 times with neopentyl glycol diheptanoate, the absorbance was tested at a wavelength of 260-400 nm using a conventional ultraviolet spectrophotometer.

[0090] The UV absorption curves of the four samples are shown in Figure 1 shown. Figure 1 The middle curve represents the UV absorption curves of four samples at the same concentration, from top to bottom, they are the specially mixed slurry (FIR-S), zinc oxide alone, simple mixed zinc oxide + tourmaline of the same proportion, and tourmaline alone. It can be seen that simply mixing tourmaline into zinc oxide will reduce the UV absorption effect of zinc oxide, while mixing by the method of the present invention will greatly improve the UV absorption effect.

[0091] (III) Cell repair effect testing methods and results.

[0092] 1. Cell Subculture

[0093] The human immortalized keratinocyte recovery, passaging, and cryopreservation procedures were used for cell recovery and culture.

[0094] 2. Cell seeding

[0095] The cells in the logarithmic growth phase were digested and centrifuged, and a cell suspension of appropriate density was prepared with complete medium. The cells were inoculated into 6-well culture plates according to the experimental design and cultured in a 37°C, 5% CO2 incubator for 24±2h. Before inoculating cells into the 6-well plate, straight parallel lines were drawn on the back of the plate with a marker pen, with a spacing of about 0.5cm.

[0096] 3. Cell scratching

[0097] When the cell confluence reaches more than 98%, use a sterile pipette tip to draw a straight line perpendicular to the bottom of the 6-well plate. The direction of the line should be perpendicular to the straight line drawn with a marker. After the line is drawn, discard the original culture medium and wash the cells 3 times with DPBS.

[0098] 4. Cell Treatment and Observation

[0099] Add serum-free medium to the sample group and the blank control group in the 6-well plate inoculated with cells, 2 mL per well, prepare a new 6-well plate cover, and apply the sample on the 6-well plate cover according to the position of the sample group in the 6-well plate. The sample solid content concentration is 30%. The 6-well plate cover with the applied sample is fixed at the bottom of the 6-well plate containing cells and continued to be cultured in a 37°C, 5% CO2 incubator. At 0h and 48±2h after streaking, use an inverted microscope to randomly select 3 fields of view in each experimental group well to take pictures. Note that the conditions for each photo must be consistent.

[0100] 5. Data Analysis

[0101] The measurement data were expressed as mean ± standard deviation (X ± s), and the data were analyzed by T-TEST. P The value was used to judge the statistical difference. P <0.05 indicated statistical significance.

[0102] The scratch area was analyzed using Image j software, and the cell migration ability was expressed as migration rate; Cell migration rate (%) = (0h scratch area - scratch area at each time point) / 0h scratch area × 100%

[0103] 6. Test validity determination conditions

[0104] Parallelism determination: The coefficient of variation CV value of the migration rate of three biological replicates in each group was ≤20%.

[0105] 7. Experimental Results

[0106] Under the experimental conditions, the coefficient of variation CV value of the migration rate of the sample group and the blank control group at 48±2h was less than or equal to 20%, and the test was valid.

[0107] When the sample solid content was 30% at the test concentration and the cells were acted on for 48±2h, the cell migration rate was higher than that of the blank control group (BC), and there was a significant difference between the sample group and the blank control group (BC) (**P<0.01). The specific test data are shown in Table 2 below.

[0108] The cell scratch test results of the four samples are shown in Table 2.

[0109]

[0110] Table 2 shows the performance of different samples in the cell scratch test. At the same concentration, zinc oxide alone has basically no better repair effect than the blank. After the introduction of tourmaline, the improvement is obvious, but the improvement of the specially mixed samples is more obvious.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A skin care composition, characterized in that The invention comprises tourmaline, hydrophobic zinc oxide, grease and dispersant, wherein the mass percentage of the hydrophobic zinc oxide in the skin care composition is 50% to 90%, and the mass percentage of the tourmaline in the skin care composition is 1% to 45%.

2. The skin care composition according to claim 1, characterized in that The oil is selected from esters that are liquid at room temperature; preferably, the mass percentage of the esters that are liquid at room temperature in the skin care composition is 10% to 40%; More preferably, the ester that is liquid at room temperature is neopentyl glycol diheptanoate.

3. The skin care composition according to claim 1 or 2, characterized in that: The dispersant is an alkyl polyglycerol ester dispersant; preferably, the mass percentage of the alkyl polyglycerol ester dispersant in the skin care composition is 1% to 10%.

4. The skin care composition according to claim 3, characterized in that: The alkyl polyglycerol ester dispersant is polyglyceryl-6 polyricinoleate, and the mass percentage of the polyglyceryl-6 polyricinoleate in the skin care composition is 2% to 5%.

5. The skin care composition according to claims 1-4, characterized in that: The preparation method of the skin care composition comprises the following steps: mixing the oil and the dispersant, adding the hydrophobic zinc oxide and the tourmaline under stirring, and continuing stirring for more than 20 minutes.

6. The skin care composition according to claim 5, characterized in that: The stirring speed is 2500-10000 rpm.

7. The skin care composition according to claim 5 or 6, characterized in that: The hydrophobic zinc oxide and the tourmaline are in powder form; preferably, the particle size of the hydrophobic zinc oxide powder is ≤200nm, and the particle size of the tourmaline powder is 1000-5000 mesh.

8. The method for preparing the skin care composition according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: mixing the grease and the dispersant, adding the hydrophobic zinc oxide and the tourmaline under stirring, and continuing stirring for more than 20 minutes; Preferably, the stirring speed is 2500-5000 rpm; Preferably, the hydrophobic zinc oxide and the tourmaline are in powder form; Preferably, the particle size of the hydrophobic zinc oxide powder is ≤200 nm, and the particle size of the tourmaline powder is 1000 mesh to 5000 mesh.

9. Use of the skin care composition according to any one of claims 1 to 7 or the preparation method according to claim 8 in the production of cosmetics.

10. The use according to claim 9, characterized in that: The skin care composition is added into a cosmetic formula, and the mass percentage of the skin care composition in the cosmetic formula is 1% to 30%.

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