Modified titanium dioxide as well as preparation method and application thereof

Abstract

The invention relates to modified titanium dioxide as well as a preparation method and application thereof. The modified titanium dioxide comprises: a core body comprising titanium dioxide particles; the coating layer is located on at least part of the surface of the core body, and the coating layer comprises an alkyl modified silsesquioxane polymer and a siloxane alcohol polymer. The modified titanium dioxide provided by the invention has good skin fitting property, and can improve the anti-darkness capability and moistening effect of cosmetics.

Description

Technical Field

[0001] The present application relates to the field of cosmetic technology, and specifically to a modified titanium dioxide and a preparation method and application thereof. Background Art

[0002] In the field of cosmetics, titanium dioxide is widely used, such as foundation, air cushion, primer, loose powder, lipstick and other products. Untreated titanium dioxide has poor dispersibility, and it is easy to oxidize and darken after contacting and absorbing the sebum secreted by the skin. It has poor compatibility with oils and cannot be spread evenly on the skin.

[0003] Surface treatment of titanium dioxide can effectively solve problems such as poor dispersibility, sticking to the skin, and powder sticking. Most of the commonly used titanium dioxide on the market is coated with one or more layers of silicon oxide on the surface, but this silicon oxide is not evenly coated on the surface of titanium dioxide, resulting in poor dispersibility of titanium dioxide and non-selective absorption of oil, which affects the glossiness of titanium dioxide and causes floating powder and sticking on the face during use, as well as oxidation, dullness and makeup removal during the use of cosmetic products. Summary of the invention

[0004] In view of the problems existing in the prior art, the embodiments of the present application provide a modified titanium dioxide and a preparation method and application thereof.

[0005] In a first aspect, the present invention provides a modified titanium dioxide, wherein the modified titanium dioxide comprises:

[0006] a core body, comprising titanium dioxide particles;

[0007] The coating layer is located on at least a portion of the surface of the core body, and the coating layer includes an alkyl-modified silsesquioxane polymer and a siloxane alcohol polymer.

[0008] In the present application, the alkyl-modified silsesquioxane polymer can provide good skin adhesion and good anti-scratch ability, so that the powder can better fit the skin and be retained for a long time. The siloxane polymer provides good moisturizing ability, reduces the excessive absorption of sebum by the powder when it adheres to the skin, improves the powder's anti-dullness ability while maintaining the skin's moisture, making the makeup effect more natural and non-sticky.

[0009] In some embodiments, based on the total mass of the modified titanium dioxide, the mass content of the alkyl-modified silsesquioxane polymer is 1% to 5%, and the mass content of the siloxane alcohol polymer is 1% to 5%.

[0010] In some embodiments, the alkyl-modified silsesquioxane polymer includes one or more of polymethyl silsesquioxane, polypropyl silsesquioxane, polyphenyl silsesquioxane, polyoctyl silsesquioxane, and C30-45 alkyl disilyl polypropyl silsesquioxane.

[0011] In some embodiments, the siloxanol polymer includes one or more of dimethiconol, trifluoropropyl dimethiconol, lauryl dimethiconol, and dimethiconol / silsesquioxane copolymer.

[0012] In some embodiments, the titanium dioxide particles have a median particle size Dv50 of 0.1 μm to 0.5 μm.

[0013] In some embodiments, the specific surface area of ​​the titanium dioxide particles is 45 m 2 / g to 55m 2 / g.

[0014] In a second aspect, the present invention provides a method for preparing a modified titanium dioxide, comprising the following steps:

[0015] providing titanium dioxide particles and a modified solution comprising an alkyl-modified silsesquioxane polymer and a siloxanol polymer, respectively;

[0016] The titanium dioxide particles are mixed with a volatile solvent to perform a primary modification treatment;

[0017] removing at least a portion of the volatile solvent, and mixing the titanium dioxide particles that have undergone the first modification treatment with the modification solution to perform a second modification treatment;

[0018] At least a portion of the liquid is removed to obtain the modified titanium dioxide.

[0019] In some embodiments, providing titanium dioxide particles comprises:

[0020] Provide titanium dioxide raw powder;

[0021] The titanium dioxide raw powder is pulverized to obtain the titanium dioxide particles, and the median particle size Dv50 of the titanium dioxide particles is 0.1 μm to 0.5 μm.

[0022] In some embodiments, providing a modified solution comprising an alkyl-modified silsesquioxane polymer and a siloxanol polymer comprises: uniformly mixing the alkyl-modified silsesquioxane polymer and the siloxanol polymer in a dispersant to obtain the modified solution.

[0023] In some embodiments, the dispersant includes one or more of isododecane and methyl polytrimethicone.

[0024] In some embodiments, the molar ratio of the alkyl-modified silsesquioxane polymer, the siloxane alcohol polymer and the dispersant is (0.5-5):(0.5-5):2, and can be optionally 2:3:2.

[0025] In some embodiments, the mass ratio of the titanium dioxide particles that have undergone one modification treatment to the modified solution is 1:(10-50), and can be optionally 1:15.

[0026] In some embodiments, the volatile solvent includes one or more of isododecane, ethanol, cyclopentasiloxane, and methyl trimethicone.

[0027] In some embodiments, the mass ratio of the titanium dioxide particles to the volatile solvent is 1:(10-50), and can be 1:15.

[0028] In a third aspect, the embodiments of the present application provide the use of the modified titanium dioxide powder of the embodiments of the first aspect of the present application or the modified titanium dioxide powder obtained by the preparation method of the embodiments of the second aspect of the present application in cosmetics.

[0029] In a fourth aspect, an embodiment of the present application provides a cosmetic comprising the modified titanium dioxide powder of the embodiment of the first aspect of the present application or the modified titanium dioxide powder obtained by the preparation method of the embodiment of the second aspect of the present application. DETAILED DESCRIPTION

[0030] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application. In the following description, at least part of the known structures and technologies are not shown to avoid unnecessary ambiguity in the present application; in addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish an entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "multiple" is more than two. Moreover, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only include those elements, but also include other elements not clearly listed, or also include elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements limited by the sentence "include..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements.

[0032] Modified titanium dioxide

[0033] The embodiment of the first aspect of the present application provides a modified titanium dioxide, the modified titanium dioxide comprising:

[0034] a core body, comprising titanium dioxide particles;

[0035] The coating layer is located on at least a portion of the surface of the core body, and the coating layer includes an alkyl-modified silsesquioxane polymer and a siloxane alcohol polymer.

[0036] In the embodiment of the present application, the alkyl-modified silsesquioxane polymer may include one or more of polymethyl silsesquioxane, polypropyl silsesquioxane, polyphenyl silsesquioxane, polyoctyl silsesquioxane, and C30-45 alkyldimethylsilylpolypropyl silsesquioxane.

[0037] The siloxanol polymer may include one or more of dimethiconol, trifluoropropyl dimethiconol, lauryl methiconol, dimethiconol / silsesquioxane copolymer.

[0038] In the present application, alkyl-modified silsesquioxane polymers and siloxanol polymers can be attached to the surface of titanium dioxide particles by physical adsorption and chemical adsorption to achieve modification of titanium dioxide particles. Alkyl-modified silsesquioxane polymers are macromolecules with a reticular structure, which can effectively coat the core of titanium dioxide particles, and the hydroxyl radicals on the surface of titanium dioxide particles can react with alkyl-modified silsesquioxane polymers to promote the hydrolysis and condensation of alkyl-modified silsesquioxane polymers, so that they can quickly gel and form a three-dimensional network structure coated on the surface of titanium dioxide particles. The active group silanol (SiOH) in the siloxanol polymer acts on the hydroxyl radicals on the surface of titanium dioxide particles through electrostatic action or hydrogen bonding, so that the alkyl-modified silsesquioxane polymer forms a denser coating layer on the surface of titanium dioxide particles, thereby improving the overall coating effect.

[0039] In the embodiments of the present application, the alkyl-modified silsesquioxane polymer can provide good skin-fitting properties and good anti-scratch properties, allowing the powder to better fit the skin and be retained for a long time. The siloxane polymer provides good moisturizing and hydrating properties, reducing excessive absorption of sebum by the powder when it adheres to the skin, improving the powder's anti-dullness ability while maintaining the skin's moisture, making the makeup effect more natural and non-sticky.

[0040] In some embodiments, based on the total mass of the modified titanium dioxide, the mass content of the alkyl-modified silsesquioxane polymer is 1% to 5%, and the mass content of the siloxane alcohol polymer is 1% to 5%.

[0041] In the embodiments of the present application, the contents of the alkyl-modified silsesquioxane polymer and the siloxane alcohol polymer in the modified titanium dioxide are respectively limited within the above-mentioned ranges, so that the modified titanium dioxide can have a higher coating integrity, provide the modified titanium dioxide with better skin adhesion and moisturizing ability, further reduce the powder's ability to absorb sebum when attached to the skin, and enhance the modified titanium dioxide's anti-dullness ability and moisturizing effect.

[0042] In some embodiments, the median particle size Dv50 of the titanium dioxide particles may be 0.1 μm to 0.5 μm. For example, the median particle size Dv50 of the titanium dioxide particles may be 0.1 μm, 0.2 μm, 0.3 μm, 0.4 μm, 0.5 μm, or a range consisting of any of the above values.

[0043] In some embodiments, the specific surface area of ​​the titanium dioxide particles can be 45 m 2 / g to 55m 2 / g. For example, the specific surface area of ​​titanium dioxide particles can be 45m 2 / g, 46m 2 / g, 47m 2 / g, 48m 2 / g, 49m 2 / g, 50m 2 / g, 51m 2 / g, 52m 2 / g, 53m 2 / g, 54m 2 / g, 55m 2 / g, or any range consisting of the above values.

[0044] In this application, Dv50 and specific surface area are both well-known in the art and can be measured using methods and instruments known in the art. For example, Dv50 can be measured using laser diffraction analysis, with reference to standard GB / T 19077-2016, using a laser particle size analyzer (e.g., Malvern Master Size 3000). Specific surface area can be measured using the instruments and methods specified in GB / T19587-2017.

[0045] Preparation method of modified titanium dioxide

[0046] The second aspect of the present application provides a method for preparing a modified titanium dioxide, which may include the following steps:

[0047] S10, respectively providing titanium dioxide particles and a modified solution containing an alkyl-modified silsesquioxane polymer and a siloxanol polymer;

[0048] S20, mixing titanium dioxide particles with a volatile solvent to perform a primary modification treatment;

[0049] S30, removing at least part of the volatile solvent, mixing the titanium dioxide particles that have undergone the first modification treatment with the modification solution to perform a second modification treatment;

[0050] S40, removing at least a portion of the liquid to obtain modified titanium dioxide.

[0051] In an embodiment of the present application, a volatile solvent is used to pretreat the titanium dioxide particles before the coating treatment. The volatile solvent will vaporize and expand at a certain temperature, which can diffuse the interlayer pores of the titanium dioxide particles and increase its specific surface area. This allows the titanium dioxide surface to have more active groups, which is beneficial to the surface adsorption and bonding of the alkyl-modified silsesquioxane polymer and the siloxane alcohol polymer during the secondary modification process, further improving the density and uniformity of the coating structure.

[0052] In some embodiments, the titanium dioxide particles may be crushed by placing the titanium dioxide raw powder into a pulverizer and pulverizing it multiple times, thereby reducing the particle size of the titanium dioxide particles, making the particle size distribution more uniform, and the pulverized titanium dioxide particles have a higher specific surface area.

[0053] In some embodiments, a modification treatment may include: mixing the crushed titanium dioxide powder and the volatile solvent evenly, and then homogenizing with a homogenizer for 15 to 20 minutes to form a bare titanium dioxide powder slurry, and heat-drying the bare titanium dioxide powder slurry until the weight remains unchanged to obtain titanium dioxide powder treated with a volatile solvent.

[0054] In some embodiments, the volatile solvent may include one or more of isododecane, ethanol, cyclopentasiloxane, and methyl trimethicone.

[0055] In some embodiments, the mass ratio of titanium dioxide particles to volatile solvent may be 1:(10-50), optionally 1:(12-35), and more optionally 1:15.

[0056] By controlling the mass ratio of titanium dioxide particles to volatile solvents in the primary modification process within the above range, the crushed titanium dioxide particles can be fully interlayer modified to increase the specific surface area of ​​the titanium dioxide particles.

[0057] In some embodiments, the modified solution can be prepared by the following method: uniformly mixing an alkyl-modified silsesquioxane polymer and a siloxane alcohol polymer in a dispersant to obtain a modified solution.

[0058] In some embodiments, the dispersant may include one or more of isododecane and methyl trimethicone. For example, the methyl trimethicone may be any one or more of 0.65 cst methyl trimethicone, 1 cst methyl trimethicone, and 1.5 cst methyl trimethicone.

[0059] In some embodiments, the molar ratio of the alkyl-modified silsesquioxane polymer, the siloxane alcohol polymer and the dispersant can be (0.5-5): (0.5-5): 2, and can be 2: 3: 2. By controlling the ratio of the two within the above range, it is beneficial to form a complete and dense coating layer on the surface of the titanium dioxide particles, so that the modified titanium dioxide has good skin affinity and wettability.

[0060] In some embodiments, the mass ratio of titanium dioxide particles after one modification treatment to the modified solution is 1: (10-50), and can be 1: 15. By controlling the ratio of titanium dioxide particles to the modified solution within the above range, it is beneficial to further form a complete and dense coating layer on the surface of the titanium dioxide particles, so that the modified titanium dioxide has better skin affinity and wettability.

[0061] In some embodiments, the secondary modification process may include: mixing the titanium dioxide powder that has undergone the primary modification process with the modification solution, homogenizing for 15 to 30 minutes, filtering with a 400-mesh filter cloth, and washing the filter residue with deionized water until the pH value is 5 to 7. The filter residue is dried at high temperature to a constant weight and then air flow pulverized to obtain modified titanium dioxide.

[0062] According to the embodiments of the present application, the preparation method provided in the embodiments of the second aspect of the present application can be used to prepare the modified titanium dioxide powder of the embodiments of the first aspect of the present application.

[0063] The embodiments of the third aspect of the present application provide the use of the modified titanium dioxide powder of the embodiments of the first aspect of the present application or the modified titanium dioxide powder obtained by the preparation method of the embodiments of the second aspect of the present application in cosmetics.

[0064] The fourth aspect embodiment of the present application provides a cosmetic, comprising the modified titanium dioxide powder of the first aspect embodiment of the present application or the modified titanium dioxide powder obtained by the preparation method of the second aspect embodiment of the present application.

[0065] In some embodiments, the amount of modified titanium dioxide added to the cosmetics may be less than or equal to 25%, and may be optionally 5% to 15%.

[0066] Example

[0067] The present invention is described below with reference to specific examples. It should be noted that the examples described below are exemplary and are only used to explain the present application, and should not be construed as limiting the present application. If no specific techniques or conditions are specified in the examples, the techniques or conditions described in the literature in this area or the product specifications are used. If the manufacturer of the reagents or instruments is not specified, they are all conventional products that can be obtained commercially.

[0068] Example 1

[0069] Preparation of modified titanium dioxide

[0070] 1) Bare powder pulverization and dispersion: 1 kg of bare titanium dioxide powder is put into a powder pulverizer for pulverization, and the process is repeated three times. The median particle size Dv50 of the obtained titanium dioxide is 0.25 μm.

[0071] 2) Volatile solvent treatment: The crushed titanium dioxide and 10 kg of cyclopentasiloxane were mixed evenly, and then homogenized with a homogenizer for 20 minutes to form a bare titanium dioxide slurry. The bare titanium dioxide slurry was heat-dried until the weight remained unchanged to obtain titanium dioxide treated with cyclopentasiloxane.

[0072] 3) Modification treatment: The titanium dioxide treated with cyclopentasiloxane is added to a modified solution of pre-dissolved polymethylsilsesquioxane, polydimethylsiloxane alcohol and isododecane (molar ratio of 2:3:2), the mass ratio of titanium dioxide to the modified solution is 1:15, homogenized for 20 minutes, filtered with a 400 mesh filter cloth, and the filter residue is washed with deionized water to a pH value of 5-7.

[0073] 4) High temperature drying: The filter residue is washed with deionized water to a pH of 5 to 7 and then dried to a constant weight.

[0074] 5) Airflow milling: The filter residue dried to a constant weight is subjected to airflow milling to obtain modified titanium dioxide.

[0075] Example 2

[0076] Preparation of modified titanium dioxide

[0077] 1) Bare powder pulverization and dispersion: 1 kg of bare titanium dioxide powder is put into a powder pulverizer for pulverization, and the process is repeated three times. The median particle size Dv50 of the obtained titanium dioxide is 0.25 μm.

[0078] 2) Volatile solvent treatment: The crushed titanium dioxide is evenly mixed with 10 kg of isododecane, and then homogenized with a homogenizer for 15 minutes to form a bare titanium dioxide slurry. The bare titanium dioxide slurry is heat-dried until the weight remains unchanged to obtain titanium dioxide treated with cyclopentasiloxane.

[0079] 3) Modification treatment: The titanium dioxide treated with cyclopentasiloxane is added to a modified solution of pre-dissolved polymethylsilsesquioxane, polydimethylsiloxane alcohol and isododecane (molar ratio of 2:3:2), the mass ratio of titanium dioxide to the modified solution is 1:15, homogenized for 30 minutes, filtered with a 400 mesh filter cloth, and the filter residue is washed with deionized water to a pH value of 5-7.

[0080] 4) High temperature drying: The filter residue is washed with deionized water to a pH value of 5 to 7 and then dried at high temperature to a constant weight.

[0081] Example 3

[0082] Preparation of modified titanium dioxide

[0083] 1) Bare powder pulverization and dispersion: 1 kg of bare titanium dioxide powder is put into a powder pulverizer for pulverization, and the process is repeated three times. The median particle size Dv50 of the obtained titanium dioxide is 0.25 μm.

[0084] 2) Volatile solvent treatment: The crushed titanium dioxide was mixed with 15 kg of isododecane and then homogenized with a homogenizer for 15 minutes to form a bare titanium dioxide slurry. The bare titanium dioxide slurry was heat-dried until the weight remained unchanged to obtain cyclopentasiloxane-treated titanium dioxide.

[0085] 3) Modification treatment: The titanium dioxide treated with cyclopentasiloxane is added to a modified solution of a pre-dissolved mixture of polymethylsilsesquioxane, polydimethylsiloxane alcohol and isododecane (molar ratio of 3:4:2), the mass ratio of titanium dioxide to the modified solution is 1:15, homogenized for 30 minutes, filtered with a 400-mesh filter cloth, and the filter residue is washed with deionized water to a pH value of 5-7.

[0086] 4) High temperature drying: The filter residue is washed with deionized water to a pH value of 5 to 7 and then dried at high temperature to a constant weight.

[0087] Example 4

[0088] Preparation of modified titanium dioxide

[0089] 1) Bare powder pulverization and dispersion: 1 kg of bare titanium dioxide powder is put into a powder pulverizer for pulverization, and the process is repeated three times. The median particle size Dv50 of the obtained titanium dioxide is 0.25 μm.

[0090] 2) Volatile solvent treatment: The crushed titanium dioxide and 10 kg of cyclopentasiloxane were mixed evenly, and then homogenized with a homogenizer for 20 minutes to form a bare titanium dioxide slurry. The bare titanium dioxide slurry was heat-dried until the weight remained unchanged to obtain titanium dioxide treated with cyclopentasiloxane.

[0091] 3) Modification treatment: The titanium dioxide treated with cyclopentasiloxane is added to a modified solution of pre-dissolved polypropylsilsesquioxane, lauryl polymethicone alcohol and isododecane (molar ratio of 2:3:2), the mass ratio of titanium dioxide to the modified solution is 1:15, homogenized for 20 minutes, filtered with a 400 mesh filter cloth, and the filter residue is washed with deionized water to a pH value of 5-7.

[0092] 4) High temperature drying: The filter residue is washed with deionized water to a pH value of 5 to 7 and then dried to a constant weight.

[0093] 5) Airflow milling: The filter residue dried to a constant weight is subjected to airflow milling to obtain modified titanium dioxide.

[0094] Comparative Example 1

[0095] The preparation method of the modified titanium dioxide is similar to that of the embodiment, except that the modified solution only includes polymethylsilsesquioxane and isododecane in a molar ratio of 1:1.

[0096] Comparative Example 2

[0097] The preparation method of the modified titanium dioxide is similar to that of the embodiment, except that the modified solution only includes polydimethylsiloxane alcohol and isododecane in a molar ratio of 3:2.

[0098] Test Section

[0099] The modified titanium dioxide prepared above was applied to cosmetics for performance testing, and the commercially available titanium dioxide surface-treated with disodium stearoyl glutamate and triethoxyoctylsilane was used as a control group. The composition of the cosmetic raw materials is shown in Table 1 below:

[0100] Table 1

[0101]

[0102] The cosmetic preparation method is as follows:

[0103] 1) Mix phase A according to the mass percentage of the formula and stir with a stirrer (speed: 500 rpm) until the system is uniform.

[0104] 2) Mix phase B according to the mass percentage and homogenize with a homogenizer (speed: 4000 rpm) until the system is uniform.

[0105] 3) While homogenizing phase B (speed: 3000 rpm), slowly pour in phase A and continue homogenizing (speed: 3500 rpm) for 10 minutes.

[0106] 4) After homogenization, degassing is performed to obtain the sample.

[0107] Performance Testing

[0108] 1. The cosmetic samples prepared by using the modified titanium dioxide in the above-mentioned embodiments, comparative examples and control groups were randomly selected to conduct blind test and score on the product's makeup durability, skin adhesion, anti-dullness ability, and whether the product stuck or floated. The minimum score interval was 0.1 points, and the full score was 10 points. The higher the score, the better the performance. The weighted arithmetic average of the score values ​​was calculated, and the obtained values ​​were used as comparative data to analyze the various properties of the modified titanium dioxide of the present invention.

[0109] 2. Moisturizing performance test: Use CK skin tester to test the user's skin moisture content W1 before using the sample and the skin moisture content W2 after 6 hours of use, and calculate the moisturizing increase rate (%) = (W2-W1) / W1*100%.

[0110] The test results are shown in Table 2.

[0111] Table 2

[0112] project Long-lasting makeup Skin-friendly Anti-dullness ability Floating powder Moisturizing properties Example 1 9.17 8.72 8.05 8.65 40.35％ Example 2 8.95 8.52 8.31 8.14 38.46％ Example 3 9.1 8.25 8.37 8.15 42.33％ Example 4 9.07 8.65 8.42 8.90 45.20％ Comparative Example 1 7.12 6.97 7.03 6.86 25.15％ Comparative Example 2 7.02 7.24 6.67 6.91 27.22％ Control group 6.73 6.13 5.23 6.35 18.35％

[0113] Combined with the data in Table 2, the modified titanium dioxide provided in the embodiments of the present application has better anti-dullness ability and skin adhesion when applied to cosmetics, and can effectively improve the water retention of the skin.

[0114] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A modified titanium dioxide, characterized in that: include: a core body, comprising titanium dioxide particles; The coating layer is located on at least a portion of the surface of the core body, and the coating layer includes an alkyl-modified silsesquioxane polymer and a siloxane alcohol polymer.

2. The modified titanium dioxide according to claim 1, characterized in that Based on the total mass of the modified titanium dioxide, the mass content of the alkyl-modified silsesquioxane polymer is 1% to 5%, and the mass content of the siloxane alcohol polymer is 1% to 5%.

3. The modified titanium dioxide according to claim 1 or 2, characterized in that: The alkyl-modified silsesquioxane polymer includes one or more of polymethyl silsesquioxane, polypropyl silsesquioxane, polyphenyl silsesquioxane, polyoctyl silsesquioxane, and C30-45 alkyldimethylsilyl polypropyl silsesquioxane; and / or The siloxanol polymer includes one or more of dimethicone, trifluoropropyl dimethicone, lauryl dimethicone, and dimethicone / silsesquioxane copolymer.

4. The modified titanium dioxide according to claim 1, characterized in that The median particle size Dv50 of the titanium dioxide particles is 0.1 μm to 0.5 μm; and / or, The specific surface area of ​​the titanium dioxide particles is 45 m2 / g to 55 m2 / g.

5. A method for preparing modified titanium dioxide, characterized in that: The steps include: providing titanium dioxide particles and a modified solution comprising an alkyl-modified silsesquioxane polymer and a siloxanol polymer, respectively; The titanium dioxide particles are mixed with a volatile solvent to perform a primary modification treatment; removing at least a portion of the volatile solvent, and mixing the titanium dioxide particles that have undergone the first modification treatment with the modification solution to perform a second modification treatment; At least a portion of the liquid is removed to obtain the modified titanium dioxide.

6. The preparation method according to claim 5, characterized in that: The providing of titanium dioxide particles comprises: Provide titanium dioxide raw powder; The titanium dioxide raw powder is pulverized to obtain the titanium dioxide particles, and the median particle size Dv50 of the titanium dioxide particles is 0.1 μm to 0.5 μm.

7. The preparation method according to claim 5, characterized in that: The method of providing a modified solution comprising an alkyl-modified silsesquioxane polymer and a siloxanol polymer comprises: The alkyl-modified silsesquioxane polymer and the siloxane alcohol polymer are uniformly mixed in a dispersant to obtain the modified solution; wherein the modified solution satisfies at least one of the following conditions: (1) The dispersant includes one or more of isododecane and methyl polytrimethylsiloxane; (2) The molar ratio of the alkyl-modified silsesquioxane polymer, the siloxane alcohol polymer and the dispersant is (0.5-5): (0.5-5): 2, and can be optionally 2:3:2; (3) The mass ratio of the titanium dioxide particles after the primary modification treatment to the modified solution is 1:(10-50), and can be optionally 1:

15.

8. The preparation method according to claim 5, characterized in that: The volatile solvent includes one or more of isododecane, ethanol, cyclopentasiloxane, and methyl trimethicone; and / or The mass ratio of the titanium dioxide particles to the volatile solvent is 1:(10-50), and can be optionally 1:

15.

9. Use of the modified titanium dioxide according to any one of claims 1 to 4 or the modified titanium dioxide obtained by the preparation method according to any one of claims 5 to 8 in cosmetics.

10. A cosmetic, characterized in that: The modified titanium dioxide comprises the modified titanium dioxide according to any one of claims 1 to 4 or the modified titanium dioxide obtained by the preparation method according to any one of claims 5 to 8, wherein the weight percentage of the modified titanium dioxide is less than or equal to 25% based on the total mass of the cosmetic.

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