KR101913467B1 - Composition for external use on skin or paste comprising aerogel having hydrophilic and hydrophobic surface - Google Patents

Abstract

Skin external preparation and paste. The external preparation for skin contains an aerogel powder comprising hybrid aerogel particles which are particles having a hydrophilic functional group and a hydrophobic functional group on the surface, and a solvent. Wherein the hydrophilic functional group is a hydroxyl group, and the hydrophobic functional group is hydrogen, a C1-C18 linear or branched alkyl group, a silyloxy group represented by the following formula (1), or a combination thereof.
[Chemical Formula 1]
* -OSiH _(3-n) R ¹ _n
Wherein R ¹ is a linear or branched alkyl group having ¹ to 18 carbon atoms, n is an integer of 0 to 3, and * indicates a bond.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a skin external preparation or paste containing an aeroglue having a hydrophilic and hydrophobic surface,

More particularly, the present invention relates to an external preparation for skin containing an aerogel.

The first developed aerogel in 1931 is a porous, lightweight material that is made by replacing the liquid portion of the gel with a gas and can be made of metal oxides such as silica, alumina, titania, zirconia, iron oxide, carbon, or agar And is formed almost by using a sol-gel method in the case of metal oxide aerogels.

Such aerogels have high microporosity and thus are used in a variety of industrial fields such as construction and building insulation as well as sound wave protection materials due to their heat shielding, sound insulation and electromagnetic shielding properties (US 6,136,216 and US 2010/0275617 ).

An object of the present invention is to provide an external preparation for skin containing aerogels and an external preparation for skin or paste having improved moisturizing performance.

According to an aspect of the present invention, there is provided an external preparation for skin. The external preparation for skin contains an aerogel powder comprising hybrid aerogel particles which are particles having a hydrophilic functional group and a hydrophobic functional group on the surface, and a solvent. Wherein the hydrophilic functional group is a hydroxyl group, and the hydrophobic functional group is hydrogen, a C1-C18 linear or branched alkyl group, a silyloxy group represented by the following formula (1), or a combination thereof.

[Chemical Formula 1]

* -OSiH _(3-n) R ¹ _n

Wherein R ¹ is a linear or branched alkyl group having ¹ to 18 carbon atoms, n is an integer of 0 to 3, and * indicates a bond.

The C1-C18 linear or branched alkyl group may be a C1-C6 linear alkyl group, and the C1-C6 linear alkyl group may be a methyl group or an ethyl group.

The hybrid airgel particles may have the hydrophobic functional group and the hydrophilic functional group on the surface thereof in a molar ratio of 7: 3 to 3: 7.

The aerogel powder may further comprise hydrophobic aerogel particles having a hydrophobic surface, hydrophilic aerogel particles having a hydrophilic surface, or a combination thereof. The hydrophobic aerogel particles having the hydrophobic surface may have an alkylsilyloxy group. The aerogel powder may contain 25 to 40 wt% of the hybrid airgel particles, 25 to 40 wt% of the hydrophilic aerogel particles, and 25 to 40 wt% of the hydrophobic aerogel particles.

A thickener, a moisturizer, an antiseptic, and a surfactant. The external preparation for skin may be a moisture cream or a peel-off pack.

According to another aspect of the present invention, there is provided an aerogel paste. The aerogel paste contains a solvent and an airgel powder which shows both an Si-O-Si group, a Si-CH3 group, and an OH group in a Fourier transform infrared (FT-IR) spectroscopic graph.

The aerogel powder may be a mixture of hybrid aerogel particles having both Si-CH 3 groups and OH groups on the surface, hydrophobic aerogel particles having Si-CH 3 groups on the surface, and hydrophilic aerogel particles having OH groups on the surface. The aerogel powder may be a mixture of 25 to 40 wt% of the hybrid airgel particles, 25 to 40 wt% of the hydrophobic aerogel particles, and 25 to 40 wt% of the hydrophilic aerogel particles. The solvent may be water, alcohol or a combination thereof.

In accordance with another aspect of the present invention, there is provided a method for preparing an external preparation for skin. First, the hydrophobic aerogel powder is heat-treated to obtain an aerogel powder in which at least a part of the particles are converted into hybrid airgel particles having hydrophobic functional groups and hydrophilic functional groups simultaneously on its surface. The aerogel powder is mixed with a solvent to obtain an aerogel paste.

The heat treatment may be performed in an oxidizing atmosphere. The hydrophobic aerogel particles having the hydrophobic surface may have an alkylsilyloxy group.

In the heat treatment step, at least some of the particles of the hydrophobic aerogel powder are converted into the hybrid airgel particles, some of the other particles are converted into hydrophilic aerogel particles having a hydrophilic surface, and some of the particles are converted into hydrophobic airgel particles And may remain as particles. The heat treated aerogel powder may contain 25 to 40 wt% of the hybrid airgel particles, 25 to 40 wt% of the hydrophilic aerogel particles, and 25 to 40 wt% of the hydrophobic aerogel particles.

The aerogel paste may be further mixed with at least one of the group consisting of thickeners, moisturizers, preservatives and surfactants.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, a skin external preparation exhibiting excellent moisturizing effect can be obtained. Furthermore, the external preparation for skin can bring about an oil removing effect and an improvement in skin texture improving effect.

However, the effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic diagram schematically showing hydrophilic aerogel particles, hydrophobic aerogel particles, and hybrid aerogel particles. Fig.
FIGS. 2A to 2C are graphs showing the results of measurement of the powder obtained in Aerogel Surface Modification Examples 1 to 3, respectively, using a Fourier transform infrared spectroscopy (FT-IR spectroscopy).
Fig. 3 is a photograph showing the degree of floatation of a mixture of the aerogel powder containing the hybrid airgel according to the aerogel surface modification example 2 and the hydrophilic aerogels according to the aerogel surface modification example 3 and the hydrophobic aerogels before the aerogel surface modification.
FIG. 4 is a graph showing moisture evaporation rates of the water cream of any one of Production Examples 1 to 6 and the water cream containing no aerogels over time. FIG.
FIG. 5 is a graph showing the results of the moisturizing effect (a, b), the oil removal effect (c, d), and the skin texture improvement of the peel-off pack containing aerogels and the airgel- And the effect (e, f).

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms.

In the present specification, when "Cx to Cy" is described, it is to be interpreted that the number of carbon atoms corresponding to all integers between the number of carbon atoms x and the number of carbon atoms y is also described.

In the present specification, when x to y are described, all the numbers between x and y should be construed as being described together.

In this specification, an aerogel may mean a gel in which the dispersion medium is a gas. Such aerogels can be classified into narrow-range aerogels and large gels according to the conditions under which the liquid contained in the gel is dried. The narrow-band aerogels remove the liquid contained in the gel at a temperature higher than the critical temperature and at a pressure higher than the intergranular pressure And the xerogel may be formed by removing it at a point below the critical point contained in the gel.

Aerogel powder

The aerogel powder according to this embodiment may have a plurality of particles. In addition, the aerogel powder may be a silica airgel powder.

At least some of the particles of the aerogel powder may be hybrid airgel particles simultaneously having a hydrophobic surface and a hydrophilic surface. In other words, the aerogel powder may comprise hybrid aerogel particles simultaneously having a hydrophobic surface and a hydrophilic surface. The hybrid aerogel particles may have both a surface as well as a surface of pores inside the particle as well as a hydrophobic surface and a hydrophilic surface.

In addition, the aerogel powder may further comprise hydrophobic aerogel particles having a hydrophobic surface, hydrophilic aerogel particles having a hydrophilic surface, or a combination thereof. In addition to the surface of the particles, the hydrophobic airgel particles may have a surface of the inner pores and also have a hydrophobic surface, and the hydrophilic aerogel particles may have a hydrophilic surface in addition to the surface of the particles.

In one example, the aerogel powder may be a mixture comprising both hydrophilic aerogel particles, hydrophobic aerogel particles, and hybrid airgel particles. In this mixture, the hybrid aerogel particles may be contained in an amount of about 25 to 40 wt%, the hydrophilic aerogel particles in an amount of about 25 to 40 wt%, and the hydrophobic aerogel particles in an amount of about 25 to 40 wt%. In one embodiment, the hybrid aerogel particles, the hydrophilic aerogel particles, and the hydrophobic aerogel particles may be contained in a weight ratio of 1: 1: 1

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic diagram schematically showing hydrophilic aerogel particles, hydrophobic aerogel particles, and hybrid aerogel particles. Fig.

Referring to Fig. 1, the hybrid aerogel particles (c) may have hydrophobic functional groups and hydrophilic functional groups at the same time. The hydrophilic aerogel particles (a) may mainly have hydrophilic functional groups on its surface. The hydrophobic aerogel particles (b) may mainly have a hydrophobic functional group on its surface. At this time, the surface functional groups may be bonded to Si atoms which are constituents of the aerogel particles. 1, the surface of the internal pores of the particles may have the same surface functionalities as the external surface of the particles.

The hydrophobic functional group (R) may be hydrogen, a C1-C18 linear or branched alkyl group, a silyloxy group represented by the following formula (1), or a combination thereof.

[Chemical Formula 1]

* -OSiH _(3-n) R ¹ _n

In Formula 1,

R ¹ is a C1-C18 linear or branched alkyl group,

n is an integer of 0 to 3,

* May represent a bond connected to Si in the aerogel particles.

When n is an integer of 1 to 3, the functional group represented by Formula 1 may be referred to as an alkylsilyloxy group. The C1-C18 linear or branched alkyl group may be a C1-C6 linear alkyl group, and may be a C1-C6 linear alkyl group saturated linear alkyl group, and examples include methyl, ethyl, n-propyl, , n-pentyl, or n-hexyl. In one embodiment, the linear alkyl group of C1-C6 may be a methyl group or an ethyl group.

On the other hand, the hydrophilic functional group may be a hydroxyl group (-OH).

The hybrid airgel particles (c) may have a hydrophobic functional group (R) and a hydrophilic functional group (OH) in a molar ratio of 7: 3 to 3: 7 on its surface. The hydrophilic aerogel particle (a) may have 80 mol% or more and 100 mol%, specifically 85 mol%, 90 mol%, 95 mol% or even 99 mol% or more of hydrophilic functional groups on its surface. The hydrophobic aerogel particles (b) may have 80 mol% or more and 100 mol%, specifically 85 mol%, 90 mol%, 95 mol% or even 99 mol% or more of hydrophobic functional groups on the surface thereof.

The hydrophilic aerogel particles (c), the hydrophilic aerogel particles (a), and the hydrophobic aerogel particles (b) are classified according to their affinity for water. When the aerogel particles are placed in a vessel containing water, The particles (a) submerged on the bottom of the vessel, the hydrophobic aerogel particles (b) floating on the water surface, and the hybrid aerogel particles (c) being semi-immersed below the water surface.

The particles of the airgel may have a size of from several to several tens of micrometers, for example between 1 and 40 micrometers. Further, the particles of the airgel may exhibit a surface area by the BET method of 500 to 1000 m ² / g.

The method of producing the aerogel powder having the hybrid airgel particles as described above may be as follows. However, the present invention is not limited thereto.

First, a hydrophobic aerogel powder can be prepared. This hydrophobic aerogel powder can be prepared by modifying the surface of the hydrogel to be hydrophobic, followed by drying and pulverizing. Specifically, the hydrophobic aerogel powder can be produced by preparing an aerogel using the method disclosed in Korean Patent No. 10-1420163 (which is incorporated by reference in this patent), and then pulverizing it. However, the present invention is not limited thereto.

The hydrophobic aerogel powder may be thermally treated to partially modify the outer surfaces of the particles and the surface of the inner pores. Specifically, hydrophobic surface functional groups of at least some of the particles in the hydrophobic aerogel powder can be converted into hydrophilic surface functional groups. In addition, hydrogen, an alkyl group or a silyloxy group, specifically an alkylsilyloxy group, which is a hydrophobic surface functional group, can be converted into a hydroxy group by heat treatment. At the same time, the residual moisture in the aerogel powder can be at least partially or completely removed.

The heat treatment of the hydrophobic aerogel powder may include a temperature raising step for raising the hydrophobic aerogel powder to a temperature elevated state and a sintering step for allowing the hydrophobic aeroge powder to be left in a heated state for a predetermined time to sinter.

Thereby, at least some of the particles of the aerogel powder as described above can be converted into hybrid airgel particles having both a hydrophobic surface and a hydrophilic surface, and some other particles can be converted into hydrophilic aerogel particles having a hydrophilic surface , And some other particles may remain as hydrophobic aerogel particles that retain a hydrophobic surface. As a result, an aerogel powder which is a mixture containing both hydrophilic aerogel particles, hydrophobic aerogel particles, and hybrid airgel particles can be obtained.

When the hydrophobic aerogels include an alkyl group (CH3), the hydrophobic aerogels may have a larger particle size, a smaller pore volume, and a smaller pore surface area than hydrophilic aerogels. In addition, as the alkyl groups are oxidized, hydroxyl groups are formed and the size of the reactor becomes smaller, the size of the airgel particles can be reduced and the surface area of the pore volume and pores can be widened. Therefore, the space for absorbing moisture can be increased and the hydrophilicity can be increased.

The heat treatment may be performed using an electric furnace, and may be performed for 0.5 to 24 hours while the temperature is raised to 300 to 500 ° C. The heat treatment may be performed in an oxidizing atmosphere, specifically, an air atmosphere. By adjusting the temperature or time of the heat treatment, it is possible to change only some of the hydrophobic surface functional groups of the hydrophobic aerogels to hydrophilic surface functional groups, or to form hydrophilic aerogels that change all the hydrophobic surface functional groups of the hydrophobic aerogels to hydrophilic surface functional groups have. As an example, it is possible to change only some of the hydrophobic surface functional groups of the hydrophobic aerogels to hydrophilic surface functional groups through a heat treatment of about 345 to 355 degrees, in particular 347 to 353 degrees, and all of the hydrophobic surface functional groups of the hydrophobic aerogels Formation of hydrophilic aerogels modified with hydrophilic surface functional groups can be carried out through a heat treatment of about 356 to 365 degrees, specifically 357 to 363 degrees.

External skin application containing aerogels

The external preparation for skin according to the present embodiment may contain at least some particles of aerogel powder having a hydrophobic surface and a hydrophilic surface at the same time, and may be prepared into any formulation conventionally produced in the art.

Such external preparations for skin can exhibit a very excellent moisturizing effect, oil removing effect and skin texture improving effect. Such external preparations for skin can exhibit a moisturizing effect due to abundant pores in the aerogels, that is, a nanoporous structure, absorb oil of a large volume to exhibit an oil-removing effect, exhibit an ultraviolet blocking effect have. In addition, such external preparations for skin may exhibit the skin texture improving effect according to the combination of the above-mentioned effects. The external preparation for skin having such an effect can protect and protect the skin from heat and ultraviolet rays simultaneously in a hot and dry environment such as a desert or a cold and dry environment such as a winter day.

In addition, since the airgel powder having both the hydrophobic surface and the hydrophilic surface is provided, it is possible to mix the hydrophobic and hydrophilic emulsions with the external preparation for skin, thereby improving the effect of the present invention.

The external preparation for skin according to the present embodiment may be used in the form of a solution, a suspension, an emulsion, a paste, a gel, a cream, a lotion, a powder, a soap, a surfactant-containing cleansing oil, a powder foundation, an emulsion foundation, Or the like, but the present invention is not limited thereto. More specifically, it can be manufactured in the form of a soft lotion, a nutritional lotion, a nutritional cream, a massage cream, an essence, an eye cream, a cleansing cream, a cleansing foam, a cleansing water, a pack, a spray or a powder. As an example, the external preparation for skin may have a paste form, specifically, a product such as a moisture cream, a mask pack, a peel-off pack, or a mask.

As an example, when the external preparation for skin according to the present embodiment is in the form of paste, that is, an aerogel paste, the above-described aerogel powder and a solvent may be mixed. The solvent may be water (purified water) or an alcohol such as ethanol or a mixture thereof. Further, the aerogel paste may further comprise an agglomerating agent. The thickening agent is for controlling the viscosity of the produced aerogel paste. Examples of the thickener include cellulose, hydroxypropylcellulose, gelatin, methylcellulose, carbomer, sodium carboxymethylcellulose, guar gum, stearic acid, polyvinyl alcohol, collagen , Mannan, carrageenan, and the like.

The airgel powder, the solvent, and the thickener may be mixed at a predetermined ratio. The mixing ratio of the solvent, the thickener, or the mixing time may be selectively set according to the amount of the aerogel powder and the use of the product to be manufactured.

The aerogel paste may contain a moisturizing agent, a functional additive, a surfactant, or a combination thereof. The moisturizing agent may have at least one kind selected from the group consisting of glycerin, propylene glycol, ethylene glycol, butylene glycol, dipropylene glycol, pentylene glycol, hexylene glycol, and sorbitol. The functional additive may be a preservative, and the preservative may have at least one of the group consisting of phenoxyethanol, methylparaben, ethylparaben, mineral oil, isopropyl alcohol and natural preservatives. The surfactant may have at least one kind selected from the group consisting of coco betaine, lecithin, xanthan gum, olive oil wax and LES.

For example, the aerogel paste may comprise from 0.001 to 10% by volume of aerogel powder, from 40 to 60% by volume of solvent, from 1 to 25% by volume of thickener, from 1 to 20% by volume of humectant, from 0.01 to 3% And 0.01 to 10% by volume of a surfactant. However, the content of the above-mentioned solvents, thickeners, moisturizers, preservatives or surfactants is not limited thereto, and it is natural that they can be mixed in different ratios.

The external preparation for skin may be a conventional auxiliary agent such as waxes, oils, coloring agents, flavoring agents, antioxidants, stabilizers, solubilizers, vitamins, pigments and fragrances, which are conventionally used in cosmetic compositions, , Or a carrier, and the like.

As described above, such an aerogel paste can be used as an external preparation for skin or a cosmetic composition, specifically, a cream, a mask pack, a peel-off pack, or the like. However, it is not limited thereto and may be used for other purposes. In addition, the airgel paste may be applied or dipped into a thin and flexible material to produce a cosmetic product in the form of a mask. As the thin and flexible material, paper, vinyl, nonwoven fabric and the like can be applied, but the present invention is not limited thereto.

Hereinafter, exemplary embodiments of the present invention will be described in order to facilitate understanding of the present invention. It should be understood, however, that the following examples are intended to aid in the understanding of the present invention and are not intended to limit the scope of the present invention.

<Aerogel Surface Modification Example 1>

Patent No. placed in the hydrophobic airgel powder having a No. 10-1420163 by a trimethylsilyl oxy group pulverized airgel (-OSi (CH _{3) 3)} method using the disclosed on a surface of an electrically-oxidizing atmosphere The temperature was raised to 340 ° C and sintered for 1 hour while maintaining this temperature.

<Aerogel Surface Modification Example 2>

Sintered in the same manner as in Aerogel Surface Modification Example 1 except that the hydrophobic aerogel powder was sintered at 350 ° C.

&Lt; Aerogel Surface Modification Example 3 &

Sintering was carried out in the same manner as in Aerogel Surface Modification Example 1, except that the hydrophobic aerogel powder was sintered at 360 ° C.

FIGS. 2A to 2C are graphs showing the results of measurement of the powder obtained in Aerogel Surface Modification Examples 1 to 3, respectively, using a Fourier transform infrared spectroscopy (FT-IR spectroscopy).

Referring to FIG. 2A, it can be seen that the aerogels according to Aerogel Surface Modification Example 1 are Si-CH 3 groups in addition to Si-O-Si groups inherent to silica, and thus are maintained as hydrophobic aerogels having a hydrophobic surface in spite of heat treatment.

2B, the aerogels according to Example 2 of Aerogel Surface Modification 2 simultaneously exhibit Si-CH 3 groups and OH groups in addition to Si-O-Si groups inherent to silica, and thus, a hybrid airgel having a hydrophobic surface modified with a hydrophilic surface by heat treatment As shown in FIG.

Referring to FIG. 2C, the aerogels according to Aerogel Surface Modification Example 3 simultaneously show OH groups in addition to Si-O-Si groups inherent to silica, and peaks corresponding to Si-CH3 groups, which were prepared before surface modification, completely disappeared, It can be seen that the hydrophobic surface is converted into a hydrophilic aerogel which is completely modified with a hydrophilic surface.

Fig. 3 is a photograph showing the degree of floatation of a mixture of the aerogel powder containing the hybrid airgel according to the aerogel surface modification example 2 and the hydrophilic aerogels according to the aerogel surface modification example 3 and the hydrophobic aerogels before the aerogel surface modification.

3, the mixture (b) of the hydrophilic aerogels according to Aerogel Surface Modification Example 3 and the hydrophobic aerogels before the aerogel surface modification is reliably divided into the hydrophobic aerogels floating on the water surface and the hydrophilic aerogels settling on the bottom of the beaker Able to know. On the other hand, the aerogel powder (a) containing the aerogels according to the aerogel surface modification example 2 is a hydrophilic aerogel submerged in the beaker bottom and a hydrophobic aerogel floating on the water surface, as well as hybrid aerogels in which the aerogel particles are half- As shown in Fig.

2B and 3, in the aerogel powder according to Aerogel Surface Modification Example 2, the hybrid aerogels have both Si-CH3 groups and OH groups on the surface, the hydrophilic aerogels mainly have OH groups on the surface, and the hydrophobic aerogels Can be presumed to have mainly Si-CH3 groups on the surface.

2B and 2C and the results of FIG. 3, the aerogel powder according to the Aerogel Surface Modification Example 2 contains 25 to 40 wt% of the hybrid aerogel particles, 25 to 40 wt% of the hydrophobic aerogel particles, , And 25 to 40 wt% of the hydrophilic aerogel particles, and further, these particles are mixed at a weight ratio of 1: 1: 1.

&Lt; Example of water cream preparation >

1 g of aerogel powder having the composition shown in the following Table 1 was mixed with 5 g of the moisture cream to prepare a water cream.

Moisture Cream Production Examples Aerogel Surface Modification According to Example 2
(Including hybrid airgel) Aerogel Surface Modification According to Example 3
(Hydrophilic aerogels) Surface unmodified
Hydrophobic aerogels Production Example 1 1 g - - Production Example 2 - 0.5 g 0.5 g Production Example 3 - 0.6 g 0.4 g Production Example 4 - 0.7 g 0.3 g Production Example 5 - 0.8 g 0.2 g Production Example 6 - 0.9 g 0.1 g

FIG. 4 is a graph showing moisture evaporation rates of the water cream of any one of Production Examples 1 to 6 and the moisture cream containing no aerogels over time. FIG. The water evaporation rate is calculated by measuring the weight change of the sample (that is, the evaporation amount of water) over time.

Referring to FIG. 4, in the case of the water cream containing no aerogels, the evaporation rate of water rapidly increases when the time exceeds 10 minutes, whereas in the case of the water cream containing aerogels (in Production Examples 1 - 6) The water evaporation rate remained constant.

It can be seen that in the water cream containing a mixture of the hydrophilic aerogels and the hydrophobic aerogels (Production Examples 2 to 6), the moisture evaporation rate is slightly lower as the content of the hydrophilic aerogels is increased.

In the case of the water cream containing the hydrophilic surface and the hydrophobic surface simultaneously, that is, the water cream containing the hybrid airgel (Production Example 1), the water cream (Preparation Examples 2 to 6) containing the mixture of the hydrophilic aerogel and the hydrophobic airgel It can be seen that the water evaporation rate is significantly lower than that in the case where the weight ratio of the hydrophilic aerogels to the hydrophobic aerogels is 9: 1 (Production Example 6). Such an advantage can exert surprisingly excellent moisture resistance in the external preparation for skin.

&Lt; Peel-off pack production example >

1 g of the airgel according to the above-mentioned aerogel surface modification example 2 was mixed with 5 g of the fill-off type pack.

FIG. 5 is a graph showing the results of the moisturizing effect (a, b), the oil removal effect (c, d), and the skin texture improvement of the peel-off pack containing aerogels and the airgel- And the effect (e, f). Specifically, the skin ("after removal") and the skin immediately after peel-off after a certain period of time after applying the peel-off pack to the skin before applying the peel- (15 min and 30 min) after 15 and 30 minutes, respectively, were measured using a skin measuring machine, and relative values obtained by setting the maximum value of each state measurement value to 5 were measured on the y-axis Respectively.

Referring to FIG. 5, a peel-off pack containing a hydrophilic surface and a hydrophobic surface simultaneously, that is, a hybrid airgel containing peel-off pack, Effect, oil removal effect, and skin texture improvement effect were similar to each other. However, when a pack containing a hybrid airgel is used as compared with a case where a pack not containing an airgel is used when a pack is peel-off and a predetermined time has elapsed, a moisturizing effect, oil removal effect, It can be seen that it is greatly improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, This is possible.

Claims (19)

An aerogel powder comprising hybrid airgel particles which are particles having a hydrophilic functional group and a hydrophobic functional group on the surface; And
A solvent,
Wherein the hydrophilic functional group is a hydroxyl group,
Wherein the hydrophobic functional group is selected from the group consisting of hydrogen, a C1-C18 linear or branched alkyl group, a silyloxy group represented by the following formula (1)
Wherein the hybrid aerogel particle has the hydrophobic functional group and the hydrophilic functional group in a molar ratio of 7: 3 to 3: 7 on its surface.
[Chemical Formula 1]
* -OSiH _(3-n) R ¹ _n
In Formula 1,
R ¹ is a C1-C18 linear or branched alkyl group,
n is an integer of 0 to 3,
* Represents a bond. The method according to claim 1,
Wherein said C1-C18 linear or branched alkyl group is a C1-C6 linear alkyl group. 3. The method of claim 2,
Wherein said C1-C6 linear alkyl group is a methyl group or an ethyl group. delete The method according to claim 1,
Wherein the aerogel powder further comprises hydrophobic aerogel particles having a hydrophobic surface, hydrophilic aerogel particles having a hydrophilic surface, or a combination thereof. 6. The method of claim 5,
Wherein the hydrophobic aerogel particle having the hydrophobic surface has an alkylsilyloxy group. 6. The method of claim 5,
Wherein the aerogel powder contains 25 to 40 wt% of the hybrid airgel particles, 25 to 40 wt% of the hydrophilic aerogel particles, and 25 to 40 wt% of the hydrophobic aerogel particles. The method according to claim 1,
Wherein the composition further contains at least one member selected from the group consisting of a thickener, a moisturizer, a preservative, and a surfactant. The method according to claim 1,
The external preparation for skin is a water cream or a peel-off pack. 1. An aerogel powder comprising the hybrid airgel particles according to claim 1, which exhibit both Si-O-Si groups, Si-CH3 groups and OH groups in a Fourier transform infrared (FT-IR) spectroscopic graph; And
Aerogel paste containing solvent. 11. The method of claim 10,
The aerogel powder comprises a mixture of hybrid aerogel particles having both Si-CH 3 and OH groups on the surface, hydrophobic aerogel particles having Si-CH 3 groups on the surface, and hydrophilic aerogel particles having OH groups on the surface, . 12. The method of claim 11,
Wherein the aerogel powder is a mixture of the hybrid aerogel particles 25 to 40 wt%, the hydrophobic aerogel particles 25 to 40 wt%, and the hydrophilic aerogel particles 25 to 40 wt%. 11. The method of claim 10,
The solvent is water, alcohol or a combination thereof. Heat treating the hydrophobic airgel powder at 345 to 355 DEG C to obtain an aerogel powder in which at least a part of the particles are converted into hybrid airgel particles having hydrophobic functional groups and hydrophilic functional groups simultaneously on its surface; And
Mixing the aerogel powder with a solvent to obtain an aerogel paste,
Wherein the heat treatment is performed in an oxidizing atmosphere. delete 15. The method of claim 14,
Wherein the hydrophobic aerogel particles having the hydrophobic surface comprise an alkylsilyloxy group. 15. The method of claim 14,
In the heat treatment step, at least some of the particles of the hydrophobic aerogel powder are converted into the hybrid airgel particles, some of the other particles are converted into hydrophilic aerogel particles having a hydrophilic surface, and some of the particles are converted into hydrophobic airgel particles A method for manufacturing an external preparation for skin, which remains as a particle. 18. The method of claim 17,
Wherein the thermally treated aerogel powder contains 25 to 40 wt% of the hybrid airgel particles, 25 to 40 wt% of the hydrophilic aerogel particles, and 25 to 40 wt% of the hydrophobic aerogel particles. 15. The method of claim 14,
Wherein the aerogel paste is further mixed with at least one member selected from the group consisting of thickeners, moisturizers, preservatives and surfactants.

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