Modified powder, preparation method therefor, and cosmetic product comprising modified powder

Abstract

A modified powder, a preparation method therefor, and a cosmetic product comprising the modified powder. The modified powder comprises a base powder and branched polysiloxane coating a surface of the base powder. The branched polysiloxane consists of 4 chain segments, the 4 chain segments being respectively represented by M, D, W, and T. The structural formula of the branched polysiloxane can be expressed as MaDbWcTd, wherein M is a [(CH3)3SiO1 / 2] chain segment, D is a [(CH3)2SiO] chain segment, W is a [R(CH3)SiO] chain segment, T is a [(CH3)SiO3 / 2] chain segment, a + b + c + d = 1, 0.01 ≤ a ≤ 0.5, 0.1 ≤ b ≤ 0.9, 0.01 ≤ c ≤ 0.8, and 0 ≤ d ≤ 0.5; R is selected from Rx and / or Ry, wherein Rx is C2-C10 alkyl, Ry is triethoxysilyl, x + y = 1, 0 ≤ x < 0.5, and 0.5 ≤ y ≤ 1; a, b, c, and d are the mass fractions of the chain segments in the branched polysiloxane, and x and y are the mass fractions of Rx and Ry in R, respectively. The modified powder has excellent hydrophobicity, lubricity, skin adhesion, and oil compatibility.

Description

Modified powder, preparation method thereof, and cosmetics containing modified powder Technical Field

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

[0002] In order for powders to be better applied in cosmetic formulations, they usually need to have good hydrophobicity.

[0003] At present, powders treated with commonly used modifiers either have good hydrophobicity but insufficient lubricity and are not skin-friendly, or have good lubricity but cannot meet the requirements of super-hydrophobicity, and cannot meet the requirements of both hydrophobicity and lubricity at the same time.

[0004] Summary of the Invention

[0005] Based on this, it is necessary to provide a modified powder and a preparation method thereof and a cosmetic comprising the modified powder to address the above problems, wherein the modified powder has excellent hydrophobicity, lubricity, skin-fitting properties and oil compatibility.

[0006] A modified powder, comprising a base powder and a branched polysiloxane coated on the surface of the base powder, wherein the structure of the branched polysiloxane consists of four segments, wherein the four segments are represented by M, D, W and T respectively, and the structural formula of the branched polysiloxane can be represented as M a D b W c T d ;

[0007] Wherein, M is [(CH3)3SiO 1 / 2 ] chain link, D is [(CH3)2SiO] chain link, W is [R(CH3)SiO] chain link, T is [(CH3)SiO 3 / 2 ] chain link, and a+b+c+d=1, 0.01≤a≤0.5, 0.1≤b≤0.9, 0.01≤c≤0.8, 0≤d≤0.5, R is selected from R x and / or R y , the R x C2-C 10 The alkyl group, the R y is a triethoxysilyl group, x+y=1, 0≤x<0.5, 0.5≤y≤1, wherein a, b, c and d are the mass fractions of each segment in the branched polysiloxane, and x and y are the mass fractions of R x and the R y The mass fraction in the R.

[0008] In one embodiment, 0.01≤a≤0.2, 0.2≤b≤0.8, 0.05≤c≤0.5, 0≤d≤0.2;

[0009] and / or, 0≤x≤0.2, 0.8≤y≤1;

[0010] And / or, the R x It is a C4-C6 alkyl group.

[0011] In one embodiment, the molecular weight of the branched polysiloxane is 3000-6000;

[0012] And / or, the viscosity of the branched polysiloxane at 25°C is 30 mm 2 / s-100mm 2 / s.

[0013] In one embodiment, the mass ratio of the base powder to the branched polysiloxane is 100:1-100:6.

[0014] In one embodiment, the R is selected from triethoxysilyl.

[0015] In one embodiment, the base powder is selected from at least one of titanium dioxide, red iron oxide, black iron oxide, yellow iron oxide, brown iron oxide, mica, sericite, synthetic fluorphlogopite, talc, boron nitride, hydroxyapatite, silica, kaolin or hydrated silica.

[0016] A method for preparing the modified powder comprises the following steps:

[0017] Provide basic powder;

[0018] Dissolving the branched polysiloxane in a solvent, and adding the solvent to the base powder under stirring to obtain a mixture;

[0019] The mixture is dried at 100° C.-140° C. to obtain modified powder.

[0020] In one embodiment, the pH value of the base powder is 5-10.

[0021] A cosmetic comprising the modified powder.

[0022] In one embodiment, the cosmetic is selected from color cosmetics.

[0023] In the present invention, a branched polysiloxane is used to modify the base powder. The branched polysiloxane can chemically react with the base powder, thereby fixing the branched polysiloxane on the surface of the base powder to form a strong coating. At the same time, because the branched polysiloxane has abundant methyl and silicone side chains, the surface of the obtained modified powder has a coating surface including abundant methyl and silicone side chains, which makes the modified powder have excellent hydrophobicity, lubricity, skin adhesion and oil compatibility.

[0024] Therefore, the modified powder obtained by treating with the branched polysiloxane has good hydrophobicity, a smooth and soft surface, a lubricated and non-greasy skin feel, and good spreadability. When used in cosmetics, it can have excellent compatibility, dispersibility and stability in a variety of oils. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] FIG1 is a contact angle test diagram of the modified titanium dioxide in Example 1 of the present invention;

[0027] FIG2 is a contact angle test diagram of the modified red iron oxide in Example 2 of the present invention. DETAILED DESCRIPTION

[0028] To facilitate understanding of the present invention, the present invention will be described in more detail below. However, it should be understood that the present invention can be implemented in many different forms and is not limited to the embodiments or examples described herein. On the contrary, the purpose of providing these embodiments or examples is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments or embodiments and are not intended to limit the present invention. The optional scope of the term "and / or" used herein includes any one of two or more related listed items, and also includes any and all combinations of related listed items, including any two related listed items, any more related listed items, or the combination of all related listed items.

[0030] At present, modifiers such as triethoxycaprylylsilane and polydimethylsiloxane are usually used to modify the surface of the base powder, so that the modified base powder has a certain hydrophobicity. However, when the base powder is modified with the above-mentioned modifiers, it cannot have excellent hydrophobicity, lubricity and skin-fitting properties at the same time. For example, when triethoxycaprylylsilane is used to modify the base powder, although the chemical coating on the surface of the base powder is good, the lubricity and skin-fitting properties of the modified powder are poor; when polydimethylsiloxane is used to modify the base powder, the modified powder has a certain lubricity, but it is a physical coating. The polydimethylsiloxane is not firm enough on the surface of the base powder and has poor oil and fat compatibility.

[0031] To this end, the present invention provides a modified powder, which includes a base powder and a branched polysiloxane coated on the surface of the base powder, wherein the branched polysiloxane is composed of four chain segments, and the four chain segments are represented by M, D, W and T respectively. The structural formula of the branched polysiloxane can be represented as M a D b W c T d ;

[0032] Wherein, M is [(CH3)3SiO 1 / 2 ] chain link, D is [(CH3)2SiO] chain link, W is [R(CH3)SiO] chain link, T is [(CH3)SiO 3 / 2 ] chain link, and a+b+c+d=1, 0.01≤a≤0.5, 0.1≤b≤0.9, 0.01≤c≤0.8, 0≤d≤0.5, R is selected from R x and / or R y , the R x C2-C 10 The alkyl group, the R y is a triethoxysilyl group, x+y=1, 0≤x<0.5, 0.5≤y≤1, wherein a, b, c and d are the mass fractions of each segment in the branched polysiloxane, and x and y are the mass fractions of R x and the R y The mass fraction in the R.

[0033] In the present invention, compared with common modifiers used for base powders, the branched polysiloxane has abundant branches and is coated on the surface of the base powder by chemically bonding with the surface of the base powder, thereby forming a coating surface on the surface of the base powder and improving the coating effect on the base powder.

[0034] Furthermore, the base powder is modified with a branched polysiloxane, which chemically reacts with the base powder, chemically coating the base powder and fixing it to the surface, forming a strong coating. Furthermore, the abundant methyl and silicone side chains in the branched polysiloxane impart excellent hydrophobicity, lubricity, and skin-friendly properties to the modified powder. The resulting modified powder, coated with branched polysiloxane, exhibits excellent hydrophobicity, lubricity, skin-friendly properties, and oil-compatibility.

[0035] Therefore, the modified powder obtained by treating with the branched polysiloxane has good hydrophobicity, a smooth and soft surface, a lubricated and non-greasy skin feel, and good spreadability. When used in cosmetics, it can have excellent compatibility, dispersibility and stability in a variety of oils.

[0036] Specifically, the branched polysiloxane can form a partial coating surface on the surface of the base powder, or it can form a complete coating surface. Preferably, when the branched polysiloxane forms a complete coating surface on the surface of the base powder, the modified powder has a core-shell structure, which can achieve a better coating effect.

[0037] Optionally, in the molecular structure of the branched polysiloxane, 0.01≤a≤0.2, 0.2≤b≤0.8, 0.05≤c≤0.5, and 0≤d≤0.2.

[0038] Optionally, 0≤x≤0.2, 0.8≤y≤1, thereby increasing R in R y The content of the branched polysiloxane further improves the hydrophobicity and grease compatibility of the branched polysiloxane and is beneficial to improving the chemical coating effect.

[0039] Optional, R x The alkyl group is C4-C6, thereby further improving the hydrophobicity and oil compatibility of the branched polysiloxane.

[0040] Optionally, the molecular weight of the branched polysiloxane is 3000-6000, which is beneficial for regulating the fluidity and dispersibility of the branched polysiloxane in the liquid foundation and improving the coating effect on the base powder.

[0041] Optionally, the viscosity of the branched polysiloxane at 25°C is 30 mm 2 / s-100mm 2 / s, further preferably, the viscosity of the branched polysiloxane is 40mm 2 / s-70mm 2 / s, thereby enabling the branched polysiloxane to be better dispersed and flowed in the liquid foundation, further improving the coating effect on the base powder.

[0042] Optionally, the mass ratio of the base powder to the branched polysiloxane is 100:1-100:6, more preferably 100:2-100:4, which can achieve a better coating effect, is beneficial to improving the hydrophobicity, lubricity and skin-fitting properties of the modified powder, and has high oil compatibility, and a smooth and fluffy skin feel.

[0043] Optionally, the R is preferably a combination of an alkyl group and a triethoxysilyl group, or the R is preferably a triethoxysilyl group, which can also be chemically bonded to the surface of the base powder through the triethoxysilyl group, so that the branched polysiloxane can be more firmly coated on the surface of the base powder, further forming a coating surface, thereby improving the hydrophobicity, lubricity, skin adhesion and oil compatibility of the modified powder.

[0044] Optionally, the base powder is selected from at least one of titanium dioxide, red iron oxide, black iron oxide, yellow iron oxide, brown iron oxide, mica, sericite, synthetic fluorphlogopite, talc, boron nitride, hydroxyapatite, silica, kaolin or hydrated silica.

[0045] The present invention also provides a method for preparing the modified powder, comprising the following steps:

[0046] S1, provides basic powder;

[0047] S2, dissolving the branched polysiloxane in a solvent, and adding the solution to the base powder under stirring to obtain a mixture;

[0048] S3, drying the mixture at 100°C-140°C to obtain modified powder.

[0049] In step S1, the pH value of the base powder is preferably 5-10, more preferably 7-8, so as to facilitate the subsequent modification treatment of the base powder with branched polysiloxane and improve the coating effect.

[0050] Specifically, since the pH value of the surface of the selected base powder varies depending on the type of base powder, when the pH value of the selected base powder is not within the above range, the pH value of the base powder needs to be adjusted so that the pH value of the base powder is 5-10, more preferably 7-8.

[0051] Optionally, the pH value of the base powder may be adjusted with an acid or a base. For example, the acid may be preferably at least one of hydrochloric acid or acetic acid, and the base may be preferably at least one of sodium hydroxide or a 28% ammonia solution.

[0052] In step S2, the branched polysiloxane is dissolved in a solvent to form a branched polysiloxane solution, and the solution is added to the base powder, and the mixture is stirred and mixed to obtain a mixture.

[0053] Optionally, the solvent for dissolving the branched polysiloxane is preferably at least one of isododecane or ethanol.

[0054] Optionally, the method of adding the branched polysiloxane solution to the base powder is not specifically limited, and preferably is a dropwise addition method, which is more conducive to promoting the uniformity of mixing the branched polysiloxane and the base powder, so that the branched polysiloxane can be more evenly coated on the surface of the base powder, forming a more uniform coating surface, improving the coating effect, and thereby improving the hydrophobicity, lubricity and skin-fitting properties of the modified powder.

[0055] Optionally, in the step of stirring and mixing to obtain the mixture, high-speed stirring can promote the mixing uniformity of the branched polysiloxane and the base powder, thereby further enhancing the coating effect of the branched polysiloxane on the base powder.

[0056] In step S3, drying at 100° C.-140° C. can activate the branched polysiloxane, promote chemical bonding between the branched polysiloxane and the surface of the base powder, further enhance the coating effect of the branched polysiloxane, and facilitate the formation of a coating surface.

[0057] Optionally, the modified powder is cooled after drying, and the cooling method is not particularly limited.

[0058] The present invention also provides a cosmetic comprising the modified powder. When the modified powder of the present invention is used in cosmetics, the modified powder has excellent dispersibility and stability, and good compatibility with other components in the cosmetics. The resulting cosmetics have good spreadability, good skin adhesion, good skin feel, and stable quality.

[0059] In one embodiment, the cosmetics are preferably color cosmetics, such as foundation, loose powder, loose powder, concealer, lipstick, eye shadow, lip pencil, eyebrow pencil, etc.

[0060] Hereinafter, the modified powder, its preparation method, and cosmetics including the modified powder will be further described through the following specific examples.

[0061] Example 1

[0062] 100 g of titanium dioxide with a particle size of 300 nm and a pH of 6.5 was placed in a powder mixing pot to provide a branched polysiloxane: triethoxysilylethyl polydimethylsiloxyethyl polydimethylsiloxane (INCI name: TRIETHOXYSILYLETHYL POLYDIMETHYLSILOXYETHYL DIMETHICONE), wherein a=0.01, b=0.8, c=0.15, d=0.04, x=0, y=1, molecular weight=1000, and viscosity at 25°C: 30 mm 2 7 g of branched polysiloxane was dissolved and dispersed in 7 g of isododecane, and the mixture was evenly added dropwise to the powder mixing pot. The mixture was stirred and mixed at 20,000 r / min for 20 seconds to obtain a mixture. The mixture was then placed in an oven at 120°C for 2 hours and cooled to obtain modified titanium dioxide.

[0063] The hydrophobicity test results of the modified titanium dioxide of this embodiment are shown in Table 1.

[0064] Example 2

[0065] 100 g of red iron oxide with a particle size of 250 nm and a pH of 3.5 was placed in a powder mixing pot, and a 28% ammonia solution was added dropwise to adjust the pH of the red iron oxide to 7.0, providing a branched polysiloxane: triethoxysilylethyl polydimethylsiloxyethyl polydimethylsiloxane (INCI name: TRIETHOXYSILYLETHYL POLYDIMETHYLSILOXYETHYL DIMETHICONE), wherein a=0.2, b=0.6, c=0.2, d=0, x=0, y=1, a molecular weight of 3000, and a viscosity of 51 mm at 25°C. 2 1 g of branched polysiloxane was dissolved and dispersed in 1 g of isododecane, and the mixture was evenly added dropwise to a powder mixing pot. The mixture was stirred and mixed at 20,000 r / min for 20 seconds to obtain a mixture. The mixture was then placed in an oven at 120°C for 2 hours and cooled to obtain modified iron oxide red.

[0066] The hydrophobicity test results of the modified red iron oxide of this embodiment are shown in Table 1.

[0067] Example 3

[0068] 100 g of yellow iron oxide with a particle size of 300 nm and a pH of 6.5 was placed in a powder mixing pot to provide a branched polysiloxane: triethoxysilylethyl polydimethylsiloxyethylhexyl polydimethylsiloxane (INCI name: TRIETHOXYSILYLETHYL POLYDIMETHYLSILOXYETHYL HEXYL DIMETHICONE), wherein a=0.1, b=0.2, c=0.5, d=0.2, x=0.1, y=0.9, R x It is hexyl, with a molecular weight of 5000 and a viscosity of 68 mm at 25°C. 2 6 g of branched polysiloxane was dissolved and dispersed in 6 g of isododecane, and the mixture was evenly added dropwise to a powder mixing pot. The mixture was stirred and mixed at 20,000 r / min for 20 seconds to obtain a mixture. The mixture was then placed in an oven at 120°C for 2 hours and cooled to obtain modified iron oxide yellow.

[0069] The hydrophobicity test results of the modified iron oxide yellow of this embodiment are shown in Table 1.

[0070] Example 4

[0071] 100 g of black iron oxide with a particle size of 300 nm and a pH of 6.8 was placed in a powder mixing pot to provide a branched polysiloxane: triethoxysilylethyl polydimethylsiloxyethylhexyl polydimethylsiloxane (INCI name: TRIETHOXYSILYLETHYL POLYDIMETHYLSILOXYETHYL HEXYL DIMETHICONE), wherein a=0.1, b=0.7, c=0.05, d=0.15, x=0.2, y=0.8, R x It is butyl, with a molecular weight of 8000 and a viscosity of 100mm at 25℃. 2 2 g of branched polysiloxane was dissolved and dispersed in 2 g of isododecane, and the mixture was evenly added dropwise to a powder mixing pot. The mixture was stirred and mixed at 20,000 r / min for 20 seconds to obtain a mixture. The mixture was then placed in an oven at 120°C for 2 hours and cooled to obtain modified iron oxide black.

[0072] The hydrophobicity test results of the modified iron oxide black of this embodiment are shown in Table 1.

[0073] Example 5

[0074] 100 g of sericite with a particle size of 300 nm and a pH of 6.5 was placed in a powder mixing pot and provided with a branched polysiloxane: triethoxysilylethyl polydimethylsiloxyethyl polydimethylsiloxane (INCI name: TRIETHOXYSILYLETHYL POLYDIMETHYLSILOXYETHYL DIMETHICONE), wherein a=0.1, b=0.7, c=0.1, d=0.1, x=0, y=1, the molecular weight was 1000, and the viscosity at 25°C was 30 mm / s. 2 3 g of branched polysiloxane was dissolved and dispersed in 3 g of isododecane, and the mixture was evenly added dropwise to a powder mixing pot. The mixture was stirred and mixed at 20,000 r / min for 20 seconds to obtain a mixture. The mixture was then placed in an oven at 120°C for 2 hours and cooled to obtain modified sericite.

[0075] The hydrophobicity test results of the modified sericite of this embodiment are shown in Table 1.

[0076] Comparative Example 1

[0077] Take 100g of titanium dioxide with a particle size of 300nm and a pH value of 5.5 in a powder mixing pot, provide polydimethylsiloxane, dissolve and disperse 3g of polydimethylsiloxane in 3g of isododecane, and evenly add it dropwise to the powder mixing pot, and stir and mix thoroughly at 20000r / min for 20s to obtain a mixture, then place the mixture in a 120℃ oven and heat and dry for 2 hours, and obtain modified titanium dioxide after cooling.

[0078] The hydrophobicity test results of the modified titanium dioxide of this comparative example are shown in Table 1.

[0079] Comparative Example 2

[0080] Take 100g of titanium dioxide with a particle size of 300nm and a pH value of 5.5 in a powder mixing pot, provide triethoxyoctylsilane, dissolve and disperse 3g of triethoxyoctylsilane in 3g of isododecane, and evenly add it dropwise to the powder mixing pot, and stir and mix thoroughly at 20000r / min for 20s to obtain a mixture, then place the mixture in a 120℃ oven and heat and dry for 2 hours, and then cool to obtain modified titanium dioxide.

[0081] The hydrophobicity test results of the modified titanium dioxide of this comparative example are shown in Table 1.

[0082] Comparative Example 3

[0083] 100 g of titanium dioxide with a particle size of 300 nm and a pH of 5.5 was placed in a powder mixing pot to provide a branched polysiloxane: triethoxysilylethyl polydimethylsiloxyethyl polydimethylsiloxane (INCI name: TRIETHOXYSILYLETHYL POLYDIMETHYLSILOXYETHYL DIMETHICONE), wherein a=0.6, b=0.3, c=0.05, d=0.05, x=0, y=1, the molecular weight was 10,000, and the viscosity at 25°C was 127 mm. 2 3 g of branched polysiloxane was dissolved and dispersed in 3 g of isododecane, and the mixture was evenly added dropwise to a powder mixing pot. The mixture was stirred and mixed at 20,000 r / min for 20 seconds to obtain a mixture. The mixture was then placed in an oven at 120°C for 2 hours and cooled to obtain modified titanium dioxide.

[0084] The hydrophobicity test results of the modified titanium dioxide of this comparative example are shown in Table 1.

[0085] Comparative Example 4

[0086] The difference between Comparative Example 4 and Example 1 is that in the branched polysiloxane, a=0.2, b=0.05, c=0.6, d=0.15, the molecular weight is 900, and the viscosity at 25°C is 24 mm 2 / s.

[0087] The hydrophobicity test results of the modified titanium dioxide of this comparative example are shown in Table 1.

[0088] Comparative Example 5

[0089] The difference between Comparative Example 5 and Example 1 is that in the branched polysiloxane, a=0.04, b=0.95, c=0.01, d=0, the molecular weight is 1000, and the viscosity at 25°C is 31 mm 2 / s.

[0090] The hydrophobicity test results of the modified titanium dioxide of this comparative example are shown in Table 1.

[0091] Comparative Example 6

[0092] The difference between Comparative Example 6 and Example 1 is that in the branched polysiloxane, a=0.16, b=0.8, c=0, d=0.04, the molecular weight is 1000, and the viscosity at 25°C is 28 mm 2 / s.

[0093] The hydrophobicity test results of the modified titanium dioxide of this comparative example are shown in Table 1.

[0094] Comparative Example 7

[0095] The difference between Comparative Example 7 and Example 1 is that in the branched polysiloxane, a=0.01, b=0.14, c=0.85, d=0, the molecular weight is 1000, and the viscosity at 25°C is 32 mm 2 / s.

[0096] The hydrophobicity test results of the modified titanium dioxide of this comparative example are shown in Table 1.

[0097] Comparative Example 8

[0098] The difference between Comparative Example 8 and Example 1 is that in the branched polysiloxane, a=0.01, b=0.4, c=0.04, d=0.55, the molecular weight is 1000, and the viscosity at 25°C is 30 mm 2 / s.

[0099] The hydrophobicity test results of the modified titanium dioxide of this comparative example are shown in Table 1.

[0100] Comparative Example 9

[0101] The difference between Comparative Example 9 and Example 1 is that the branched polysiloxane is triethoxysilylethyl polydimethylsiloxyethylhexyl polydimethylsiloxane (INCI name is TRIETHOXYSILYLETHYL POLYDIM ETHYLSILOXYETHYL HEXYL DIMETHICONE), wherein x=0.6, y=0.4, R x It is octyl, with a molecular weight of 1000 and a viscosity of 32 mm at 25°C. 2 / s.

[0102] The hydrophobicity test results of the modified titanium dioxide of this comparative example are shown in Table 1.

[0103] Comparative Example 10

[0104] The difference between Comparative Example 10 and Example 1 is that the branched polysiloxane is triethoxysilylethyl polydimethylsiloxyethylhexyl polydimethylsiloxane (INCI name is TRIETHOXYSILYLETHYL POLYDIM ETHYLSILOXYETHYL HEXYL DIMETHICONE), wherein x=0.6, y=0.4, R x It is dodecyl, with a molecular weight of 1000 and a viscosity of 31 mm at 25°C. 2 / s.

[0105] The hydrophobicity test results of the modified titanium dioxide of this comparative example are shown in Table 1.

[0106] Table 1

[0107] As can be seen from Table 1, the contact angles of the modified powders obtained in the examples of the present invention are all greater than 150°, indicating superhydrophobicity.

[0108] Application Example 1

[0109] The modified powder obtained in the embodiment of the present invention is used in liquid foundation. The formula of the liquid foundation is shown in Table 2.

[0110] Table 2

[0111] Comparative Application Examples 1-10 refer to Application Example 1, and the modified titanium dioxide of Comparative Application Examples 1-10 is used in liquid foundation to replace the modified powder in the liquid foundation of Application Example 1 in equal amounts.

[0112] Thirty volunteers were selected as research subjects. After applying the liquid foundations of Example 1 and Comparative Examples 1-10, the volunteers' skin-fitting and lubricity performance were recorded and scored. The scores ranged from 0 to 10, with higher scores indicating better results. The scoring results were tallied and the averaged across the 30 volunteers for the same liquid foundation. Scores of 8 ≤ N ≤ 10 were considered excellent for skin-fitting and lubricity, 6 ≤ N < 8 were considered good for skin-fitting and lubricity, and N < 6 were considered poor for skin-fitting and lubricity.

[0113] The statistical results of Application Example 1 and Application Comparative Examples 1-10 are shown in Table 3.

[0114] Table 3

[0115] As shown in Table 3, Example 1 shows that the modified powder obtained by modifying the base powder with a branched polysiloxane can be applied to a liquid foundation to obtain excellent lubricity and skin-fitting properties. This indicates that the branched polysiloxane forms a chemical coating surface by chemically bonding with the surface of the base powder, thereby achieving an excellent coating effect. Therefore, the surface of the modified powder has abundant methyl and silicone side chains, which gives the modified powder excellent lubricity and skin-fitting properties.

[0116] As can be seen from Comparative Examples 1-10 in Table 3, the modified powders obtained by treating with conventional powder modifiers or other branched polysiloxanes have poor coating effects, and thus when the modified powders are applied to liquid foundation, the lubricity and skin-fitting properties of the liquid foundation are reduced.

[0117] Application Example 2

[0118] The modified powder obtained in the embodiment of the present invention is used in eye shadow. The formula of the eye shadow is shown in Table 4.

[0119] Table 4

[0120] With reference to Application Example 1 and Application Comparative Examples 1-10, Application Example 2 and Application Comparative Examples 11-20 are set. The statistical results of Application Example 2 and Application Comparative Examples 11-20 are shown in Table 5.

[0121] Table 5

[0122] Application Example 3

[0123] The modified powder obtained in the embodiment of the present invention is used in lipstick. The formula of the lipstick is shown in Table 6.

[0124] Table 6

[0125] With reference to Application Example 1 and Application Comparative Examples 1-10, Application Example 3 and Application Comparative Examples 21-30 are set. The statistical results of Application Example 3 and Application Comparative Examples 21-30 are shown in Table 7.

[0126] Table 7

[0127] As can be seen from Application Examples 2 and 3 in Tables 5 and 7, the modified powder can still be used in eye shadow and lipstick to achieve excellent lubricity and skin adhesion, indicating that the modified powder of the present invention can be applied to a variety of cosmetic formulas and has excellent lubricity and skin adhesion in a variety of cosmetic formulas.

[0128] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0129] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A modified powder, characterized in that: The modified powder comprises a base powder and a branched polysiloxane coated on the surface of the base powder, wherein the branched polysiloxane is composed of four chain segments, wherein the four chain segments are represented by M, D, W and T respectively, and the structural formula of the branched polysiloxane can be represented by M a D b W c T d ; Wherein, M is [(CH3)3SiO 1 / 2 ] chain link, D is [(CH3)2SiO] chain link, W is [R(CH3)SiO] chain link, T is [(CH3)SiO 3 / 2 ] chain link, and a+b+c+d=1, 0.01≤a≤0.5, 0.1≤b≤0.9, 0.01≤c≤0.8, 0≤d≤0.5, R is selected from R x and / or R y , the R x C2-C 10 The alkyl group, R y is triethoxysilyl, x+y=1, 0≤x<0.5, 0.5≤y≤1, wherein a, b, c and d are the mass fractions of each segment in the branched polysiloxane, and x and y are the mass fractions of R x and the R y The mass fraction in said R.

2. The modified powder according to claim 1, characterized in that: 0.01≤a≤0.2, 0.2≤b≤0.8, 0.05≤c≤0.5, 0≤d≤0.2; and / or, 0≤x≤0.2, 0.8≤y≤1; and / or, the R x It is a C4-C6 alkyl group.

3. The modified powder according to claim 1, characterized in that: The molecular weight of the branched polysiloxane is 3000-6000; And / or, the viscosity of the branched polysiloxane at 25°C is 30 mm 2 / s-100mm 2 / s.

4. The modified powder according to claim 1, characterized in that: The mass ratio of the base powder to the branched polysiloxane is 100:1-100:

6.

5. The modified powder according to claim 1, characterized in that: The R is selected from triethoxysilyl.

6. The modified powder according to claim 1, characterized in that: The base powder is selected from at least one of titanium dioxide, red iron oxide, black iron oxide, yellow iron oxide, brown iron oxide, mica, sericite, synthetic fluorphlogopite, talc, boron nitride, hydroxyapatite, silica, kaolin or hydrated silica.

7. A method for preparing the modified powder according to any one of claims 1 to 6, characterized in that: The following steps are involved: Provide basic powder; Dissolving the branched polysiloxane in a solvent, and adding the solvent to the base powder under stirring to obtain a mixture; The mixture is dried at 100° C.-140° C. to obtain modified powder.

8. The method for preparing modified powder according to claim 7, characterized in that: The pH value of the basic powder is 5-10.

9. A cosmetic comprising the modified powder according to any one of claims 1 to 6.

10. The cosmetic according to claim 9, characterized in that: The cosmetics are selected from color cosmetics.

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