CN110812276B

CN110812276B - Porous composite powder for removing tiny dust and preparation method thereof

Info

Publication number: CN110812276B
Application number: CN201910736645.4A
Authority: CN
Inventors: 李炫锡; 金敏基; 金亨俊; 郑昌朝; 郑海真; 车娜悧; 崔星旭
Original assignee: Amorepacific Corp
Current assignee: Amorepacific Corp
Priority date: 2018-08-09
Filing date: 2019-08-09
Publication date: 2023-07-04
Anticipated expiration: 2039-08-09
Also published as: JP2020026429A; KR20200017820A; CN110812276A

Abstract

According to the porous composite powder for removing the tiny dust, the magnetic particles are uniformly immersed in the polymer with the porous property in a single spraying process, so that the tiny dust is sucked into the air holes when the powder is smeared on the skin, and then the powder is easily removed from the skin by using the magnet applicator, so that the tiny dust remained in the skin and pores is effectively removed.

Description

Porous composite powder for removing tiny dust and preparation method thereof

Technical Field

The specification discloses a porous composite powder with excellent dust removal effect and a preparation method thereof.

Background

If dust accumulates in the body, it will cause a decrease in immunity of the human body and induce various diseases such as heart diseases or respiratory diseases. Even bronchoconstriction can be caused, increasing the incidence of asthma or lung disease, and early mortality if inhaled for a long period of time.

The skin acts as the outermost layer of our body in direct contact with dust, acting as a barrier between the organism and the environment, which barrier function is low if exposed to contamination directly, often. In particular, the fine dust is 20 times smaller than the pores, so that it easily penetrates into the skin. In fact, atmospheric pollutants such as dust particles have a serious impact on skin health. In a short period, early aging, lack of water and increase of fine lines and wrinkles of the skin are caused, and in a long period, the skin loses the function of protecting the body under the environmental factors due to irreversible skin damage, and serious diseases such as skin cancer are caused.

In particular, although most of dust accumulated on the skin can be removed using conventional various cleaners, it is difficult to remove fine dust entering pores. Therefore, it is necessary to study a functional composite powder structure to effectively remove harmful substances, i.e., fine dust, remaining in pores, which damage the skin and cause fatal damage to the human body. Furthermore, since the material acts in pores, it is important to select a safer biocompatible material that is free of irritation.

[ Prior Art literature ]

[ patent literature ]

Patent document 1 korean patent laid-open No. 2014-0118504.

Disclosure of Invention

Technical problem

In one aspect, the present invention is to effectively inhale sebum or the like containing fine dust, which adheres to the skin, into a porous composite powder by using the porous composite powder.

In another aspect, the present invention resides in effectively removing fine dust remaining in skin and pores by using a porous composite powder containing magnetic particles and a magnet applicator.

In another aspect, the present invention is to prepare porous composite powder impregnated with uniform magnetic particles for removing fine dust according to a simple process.

Technical proposal

In one aspect, the present invention provides a porous composite powder for removing fine dust, comprising: a polymer; and magnetic particles impregnated in the polymer.

In another aspect, the present invention provides a composition comprising the porous composite powder described above.

In another aspect, the present invention provides a method of removing dust particles, the method comprising: applying the composition to the skin; the porous composite powder is detached from the skin using a magnet applicator.

On the other hand, the invention also provides a preparation method of the porous composite powder for removing the tiny dust, which comprises the following steps: preparing a solution containing a polymer; dispersing magnetic particles in a solution containing the polymer; and spray-drying the solution in which the magnetic particles are dispersed.

Advantageous effects

In one aspect of the present invention, the porous composite powder for removing fine dust of the present invention is effective in removing fine dust remaining in skin and pores by uniformly impregnating magnetic particles in porous polymer to suck sebum containing fine dust into pores and then easily removing it from skin using a magnet applicator.

Drawings

Fig. 1 shows a schematic diagram of a spray-drying process for preparing a porous composite powder for removing fine dust according to the present invention.

Fig. 2a and 2b show electron microscope images of porous composite powder according to the present invention, and fig. 2b is an image of a further enlarged surface.

Fig. 3a and 3b show photographs of an oil absorption measuring device (S-500, asahi Souken) for measuring the oil absorption of the porous composite powder according to the present invention.

Fig. 4 shows the measurement results of oil absorption (ml/g) of the general iron oxide and the porous composite powder (plga+iron oxide) according to the present invention.

Fig. 5a to 5f show EDX-mapped images after a solution containing five heavy metals (cadmium, mercury, antimony, lead, arsenic) is fully absorbed in the porous composite powder according to the present invention.

Fig. 6a and 6b show the results of evaluating the dust removal performance of the porous composite powder according to the present invention by using a pore model body.

Fig. 7 shows a schematic view of the characteristics of the porous composite powder for removing fine dust according to the present invention.

Fig. 8 shows a schematic diagram of a mechanism (dust shuttle movement) for removing dust from porous composite powder according to the present invention.

Fig. 9 shows the result of measuring the magnetism of the porous composite powder according to the present invention according to the iron oxide content.

Fig. 10a and 10b show the results of measuring the Porosity (Porosity) of the porous composite powder according to the present invention.

Disclosure of Invention

Definition of terms

In the present specification, the term "magnetic particles" refers to ferromagnetism (ferromagnetism, iron, nickel, cobalt, etc.), ferrimagnetism (ferromagnetism, fe ₂ O ₃ 、MnFe ₂ O ₄ 、BAO ₆ Fe ₂ O ₃ Etc.), paramagnetic (Paramagnetic, aluminum, titanium, copper alloy, etc.), superparamagnetic (Fe ₃ O ₄ Etc.), etc., all particles having magnetism not limited to the degree and kind of magnetism. Furthermore, the magnetic particles may be impregnated.

In the present specification, the term "dust" refers to a general term of fine particles mixed in air, and generally refers to suspended matter having a particle diameter of 10mm or less. In particular, the fine dust is referred to as fine dust when the particle diameter is 10 μm or less, ultrafine dust when the particle diameter is 2.5 μm or less, and ultrafine dust when the particle diameter is 0.1 μm or less. The particle size may be an average value of particle sizes of the respective particles in the fine dust. Dust includes substances from nature such as sand, earth and pollen, or substances from industrial processes such as carbon-carbon combustibles, metal salts and heavy metals. The dust may be present in the form of dust particles (fume), mist, smoke, steam or fog.

In the present specification, the term "particle diameter" refers to the diameter of particles, and the defined particle diameter range refers to the diameter range of individual particles.

In this specification, when a portion is referred to as "comprising" a certain element, it should be understood that the inclusion of other elements is not meant to be exclusive, unless otherwise indicated, but may be included.

Detailed description of exemplary embodiments

Hereinafter, the present invention will be described in detail.

Porous composite powder for removing tiny dust

In an exemplary embodiment of the present invention, there is provided a porous composite powder for removing fine dust, comprising: a polymer; and magnetic particles impregnated in the polymer.

The dust existing in pores can be sucked together with sebum by using conventional porous silica or porous polymer particles, but this has a fatal problem in that it is difficult to remove porous particles having entered pores.

In order to overcome the above problems, the present inventors have discovered a porous composite powder for removing fine dust by uniformly impregnating magnetic particles having magnetism into porous polymer and then penetrating them into pores, and then easily removing the porous composite powder from the pores by using a magnet applicator after sucking fine dust mixed with sebum by using capillary phenomenon, so that it is safely detached from the skin (fig. 8).

Specifically, by introducing a spray drying technique, a composite powder in which magnetic particles are uniformly impregnated in a porous polymer can be prepared by a single process. The greatest advantage of the present technology is that biodegradable polymers can be used for the polymers to maximize skin affinity (fig. 7).

In one embodiment, the polymer is one or more selected from polymethyl methacrylate (PMMA), polystyrene (PS), polyvinylpyrrolidone (PVP), polycaprolactone (PCL), polylactic acid (PLA), and lactic acid/glycolic acid copolymer (PLGA), but is not limited thereto, as long as it is soluble in anhydrous dichloromethane, ethanol, acetone, etc.

In one embodiment, the polymer may be a biodegradable polymer, and may be one or more selected from Polycaprolactone (PCL), polylactic acid (PLA), and lactate/glycolate copolymer (PLGA), and may preferably be a lactate/glycolate copolymer (PLGA). In the present invention, the problem of plastic microbeads can be eliminated by using biodegradable polymers. Furthermore, although acting in pores, the biocompatibility to the skin can be improved.

In one embodiment, the magnetic particles may be selected from iron, nickel, cobalt, mnFe ₂ O ₄ 、BaO·6Fe ₂ O ₃ One or more of aluminum alloy, titanium alloy, copper alloy, and iron oxide, preferably Fe ₃ O _4。

In one embodiment, the impregnation rate of the magnetic particles may be 50 to 90 wt%, for example, 55% or more, 60% or more, 65% or more, or 70% or more, and 88 wt% or less, 86 wt% or less, 84 wt% or less, 82 wt% or less, or 80 wt% or less, based on the total weight of the porous composite powder. If the impregnation rate is less than 50 wt%, it may be difficult to remove the porous composite powder having sebum absorbed therein from pores due to weak magnetism. If the impregnation rate is more than 90 wt%, although the magnetism increases, the sebum absorption amount may decrease.

In one embodiment, the particle size of the porous composite powder may be 10 to 100 μm, for example, 15 μm or more, 20 μm or more, 25 μm or more, or 30 μm or more, and 95 μm or less, 85 μm or less, 80 μm or less, 75 μm or less, 70 μm or less, 65 μm or less, 60 μm or less, 55 μm or less, or 50 μm or less. If the particle diameter is less than 10 μm, it may be difficult to sufficiently inhale sebum or the like containing fine dust on the skin, and if the particle diameter is more than 100 μm, a graininess or a foreign body sensation may be perceived when applied to the skin.

In one embodiment, the pore size within the plurality of porous composite powders may be 100nm-10 μm, for example, 150nm or more, 200nm or more, 250nm or more, 300nm or more, 350nm or more, 400nm or more, 450nm or more, or 500nm or more, and 9 μm or less, 8 μm or less, 7 μm or less, 6 μm or less, 5 μm or less, 4 μm or less, 3 μm or less, 2 μm or less, or 1 μm or less. If the pore diameter is less than 100nm, it may be difficult to suck sebum containing fine dust into pores, and if the pore diameter is more than 10 μm, it is likely that particles are easily broken due to a decrease in mechanical strength.

In one embodiment, the average pore size (Average Pore Diameter, pore size, 4V/a) in the porous composite powder may be 0.01-2 μm, for example, may be 0.05 μm or more, 0.1 μm or more, 0.2 μm or more, or 0.3 μm or more, and 1.7 μm or less, 1.5 μm or less, 1.3 μm or less, 1.1 μm or less, 0.9 μm or less, 0.8 μm or less, 0.7 μm or less, 0.6 μm or less, 0.5 μm or less, or 0.4 μm or less.

In one embodiment, the porous composite powder may have a porosity of 30-80%, for example, 35% or more, 40% or more, 45% or more, 50% or more, 55% or more, 60% or more, or 65% or more, and 75% or less, 70% or less, or 65% or less. The porosity means the total proportion of pores capable of actually sucking sebum containing fine dust, and if it is less than 30%, the effect of removing fine dust may be very small; if it exceeds 80%, the mechanical strength is lowered, resulting in a high possibility of deformation or breakage of the particles.

In one embodiment, the magnetization value of the porous composite powder measured by a magnetometer may be 30-70emu/g, for example, 35emu/g or more, 40emu/g or more, 45emu/g or more, or 50emu/g emu/g or more, and 65emu/g or less, 60emu/g or less, or 55emu/g or less. When the magnetization is less than 30emu/g, it may be difficult to remove the porous composite powder according to the present invention, which has inhaled sebum containing fine dust, and when it exceeds 70emu/g, it may be difficult to remove the composite powder from the magnet applicator.

In one embodiment, the porous composite powder may remove fine dust having a particle size of 2.5 μm or less, for example, fine dust having a particle size of 2 μm or less, 1.5 μm or less, or 1 μm or less. Even if fine dust having a small particle diameter penetrates into pores, the porous composite powder according to the present invention can suck fine dust mixed with sebum into pores by capillary phenomenon, and can be easily removed from pores by using a magnet applicator described later, thereby easily removing harmful substances from skin.

In one exemplary embodiment of the present invention, a composition for removing fine dust comprising the above porous composite powder is provided.

In one embodiment, the porous composite powder may be present in an amount of 30-70 wt%, for example, 35 wt% or more, 40 wt% or more, 45 wt% or more, or 50 wt% or more, and 65 wt% or less, 60 wt% or less, or 55 wt% or less, based on the total weight of the composition. If the content of the porous composite powder is less than 30 wt%, the effect of removing the fine dust may not be obvious; if it is more than 70 wt%, a foreign body sensation may be perceived and may be harmful to the skin.

In one embodiment, the composition may be a cosmetic composition in a dosage form comprising a cosmetically or dermatologically acceptable medium or matrix. The cosmetic composition may be in the form of all formulations suitable for topical use, for example in the form of solutions, gels, solids, pasty anhydrous products, emulsions, suspensions, microemulsions, microcapsules, fine particles, ionic (liposomes) and nonionic vesicle dispersants obtained by dispersing an oil phase in an aqueous phase, or also in the form of creams, lotions, emulsions, powders, ointments, sprays or concealers. These compositions may be prepared by methods conventional in the art. The composition according to the invention may also be used in the form of a foam or in the form of an aerosol composition containing a compressed propellant.

The cosmetic composition according to the embodiment of the present invention is not particularly limited in formulation form, and for example, cosmetics in the form of a skin softening lotion, a astringent lotion, a skin moisturizing lotion, a nourishing cream, a massage cream, an essence, an eye cream, an eye essence, a cleansing cream, a cleansing foam, a cleansing lotion, a cleansing wet towel containing the cosmetic composition, a mask, a powder, a body cream, a body oil, a body essence, and the like can be prepared.

When the dosage form of the present invention is a paste, cream or gel, animal fibers, plant fibers, waxes, paraffins, starch, tragacanth, cellulose derivatives, polyethylene glycols, silicones, bentonites, silica, talc or zinc oxide and the like may be used as carrier components.

When the dosage form of the present invention is a powder or a spray, lactose, talc, silica, aluminum hydroxide, calcium silicate or polyamide powder can be used as a carrier component. In particular, when the dosage form is a spray, a propellant such as chlorofluorocarbon, propane/butane or dimethyl ether may be further included.

When the dosage form of the present invention is a solution or emulsion, a solvent, solvate or emulsifier may be used as a carrier component, such as water, ethanol, isopropanol, ethyl carbonate, ethyl acetate, benzyl alcohol, benzyl benzoate, propylene glycol, 1, 3-butanediol oil, glycerol fatty acid ester, polyethylene glycol or fatty acid esters of sorbitan.

When the dosage form of the present invention is a suspension, water, a liquid diluent such as ethanol or propylene glycol, a suspending agent such as ethoxylated isostearyl alcohol, polyoxyethylene sorbitol ester and polyoxyethylene sorbitan ester, microcrystalline cellulose, aluminum metahydroxide (aluminum methahydroxide), bentonite, agar-agar, or tragacanth, and the like may be used.

When the dosage form of the present invention is a surfactant-containing detergent, an aliphatic alcohol sulfate, an aliphatic alcohol ether sulfate, a sulfosuccinic monoester, a isethionate, an imidazoline derivative, a methyltaurin sulfonate, sodium lauroyl sarcosinate, a fatty acid amide ether sulfate, an alkylamidobetaine, a fatty alcohol, a fatty acid glyceride, a fatty acid diethanolamide, a vegetable oil, a lanolin derivative, an ethoxylated glycerol fatty acid ester, or the like can be used as a carrier component.

The cosmetic composition according to the embodiment of the present invention may further include functional additives and ingredients generally included in the cosmetic composition, in addition to the porous composite powder. The functional additive may comprise a component selected from the group consisting of water-soluble vitamins, oil-soluble vitamins, polymeric peptides, polymeric polysaccharides, sphingolipids and seaweed extracts.

The cosmetic composition of the present invention may contain, in addition to the above functional additives, components contained in usual cosmetic compositions as required. For example, other ingredients included in the composition may be oil ingredients, moisturizers, emollients, surfactants, organic and inorganic pigments, organic powders, ultraviolet absorbers, preservatives, bactericides, antioxidants, plant extracts, pH adjusters, ethanol, pigments, blood circulation promoters, coolants, antiperspirant, purified water, and the like.

In an exemplary embodiment of the present invention, there is provided a method of removing fine dust, including the steps of: applying the composition to the skin; and removing the porous composite powder from the skin by using a magnet applicator.

The magnet applicator may be, but is not limited to, a stubby spoon shape. Further, the bottom surface of the head may be made to have a magnetic property of 2000-4000G by using a neodymium magnet, but is not limited thereto.

Preparation method of porous composite powder for removing tiny dust

In an exemplary embodiment of the present invention, there is also provided a method for preparing porous composite powder for removing fine dust, including the steps of: preparing a solution containing a polymer; dispersing magnetic particles in the solution containing the polymer; and spray-drying the solution in which the magnetic particles are dispersed.

Specifically, according to fig. 1, the polymer is dissolved in an organic solvent such as DCM to prepare a solution containing the polymer, and magnetic particles may be added to the solution and dispersed by using a homogenizer. Then, the solution in which the magnetic particles are dispersed is spray-dried by using a nozzle, whereby a porous composite powder for removing fine dust can be prepared.

According to the above spray drying technique, a porous composite powder in which magnetic particles are uniformly impregnated in a porous polymer can be easily prepared by a single process.

Wherein the internal humidity of the spray dryer is maintained at 30% or more, the internal temperature can be maintained at room temperature, and spray drying is performed under conditions of a Feed rate (Feed rate) of 20%, an Aspirator (Aspirator) of 70%, and 20 atm.

In one embodiment, the spray drying is performed by first stirring the solution in which the magnetic particles are dispersed in the container before the inflow operation using the pump, so as to prevent the deposition of the magnetic particles before the spray drying.

In one embodiment, the solvent of the solution containing the polymer may be selected from one or more of anhydrous dichloromethane (Dichloromethane anhydrous), ethanol and acetone, and may be preferably anhydrous dichloromethane.

In one embodiment, after the spray drying step, steps of methanol washing and tray drying may be further included. By this step, a porous composite powder from which the residual solution is completely removed can be obtained.

In an exemplary embodiment of the invention, there is provided the use of the porous composite powder in the preparation of a composition for removing fine dust.

In one embodiment, the porous composite powder may be present in an amount of 30-70 wt% based on the total weight of the composition for removing the fine dust.

In one embodiment, the composition for removing the fine dust may be a cosmetic composition.

Hereinafter, the present invention will be described in more detail by the following examples. However, the following examples are merely examples to aid in understanding the present invention, and the scope and scope of the present invention are not limited thereto.

Example-preparation of porous composite splits for removal of motes

First, magnetic particles (iron oxide, manufactured by DAITO KASEI corporation), lactic acid/glycolic acid copolymer (manufactured by lactic acid/glycolic acid copolymer, PLGA, GALACTIC corporation), anhydrous methylene chloride (DCM, manufactured by Sigma-Aldrich, purity > 99.8%), and lactic acid/glycolic acid copolymer (PLGA) composite powder impregnated with magnetic particles (hereinafter referred to as AP spheres) were prepared as follows.

1) 40g of PLGA was dissolved in 1L of DCM solvent.

2) 40g of magnetic particles were added to the PLGA solution and dispersed with a homogenizer.

3) The PLGA solution containing the magnetic particles dispersed therein was spray-dried by using a self-made spray dryer (see fig. 1).

4) The internal humidity of the spray dryer was maintained at 30% or more and the internal temperature was maintained at room temperature.

5) At Feed rate (Feed rate): 20% of a base; aspirator (Aspirator): spray drying was performed under conditions of 70%,20 atm. At the time of spray drying, the PLGA solution in which the magnetic particles are dispersed is continuously stirred by using a stirrer.

6) After thoroughly washing the spray-dried magnetic particle/PLGA composite powder, drying and completely removing the residual solvent to obtain lactic acid/glycolic acid copolymer (PLGA) composite powder impregnated with magnetic particles.

< surface observation of porous composite powder >

From the surface photographs, it can be confirmed that iron oxide particles are densely impregnated therein even though pores of several hundred nanometers are formed, according to fig. 2a and 2 b. Furthermore, when the sample is iron oxide: when plga=80:20, 1g of the sample was treated at 500 ℃ for 180 minutes, and the actual loss on ignition (loss on ignition) was 19 to 21% by measuring the weight loss after the polymer was completely burned, so that it was confirmed that the iron oxide was uniformly impregnated into the composite powder.

< determination of pore Structure of porous composite Split >

By determining the pore structure of the AP sphere, it was confirmed that the total intrusion volume (Total Intrusion Volum) was 0.62mL/g according to the results with reference to FIGS. 10a and 10b, which was similar to the level of oil absorption (0.48 mL/g) measured using an oil absorption measuring apparatus (S-500, asahi Souken, FIGS. 3a and 3 b) described later. Further, the average pore size (average pore diameter (4V/A)) was 0.33. Mu.m, which was found to be similar to the pore diameter on the SEM image described above (FIGS. 2a and 2 b).

In addition, the Porosity (Porosity) of this example, that is, the total ratio of pores capable of actually absorbing sebum, was 61%, because the effect of impregnating the iron oxide particles with 80% was maintained while the internal pore structure was maintained.

Experimental example-measurement of oil absorption

In order to examine whether the AP sphere can effectively suck sebum containing fine dust into the pores, the oil absorption of MCT oil (CAS. No73398-61-5) most similar to the physical properties of sebum was measured by using the existing oil absorption measuring apparatus (S-500, asahi Souken, FIGS. 3a and 3 b) according to the following method, and the results are shown in FIG. 4.

1) The weight of the powder to be measured is measured and then placed into the sample chamber.

2) When the oil absorption measuring device starts to operate, the oil pump adds oil dropwise into the chamber, in which two agitators rotate and agitate the powder and the oil.

3) As the amount of oil added is increasing, the torque value applied to the stirrer is also increasing and when the maximum value is reached, the test is complete.

4) At this time, the oil absorption (ml/g) of the powder was calculated by dividing the oil amount (ml) corresponding to 70% of the maximum torque by the sample amount (g). Specifically, the oil amount was 14.09ml, the sample amount was 29.35g, and the calculated oil absorption value was 14.09/29.35 =0.48 ml/g.

From reference to FIG. 4, it was confirmed that, although the oil absorption of iron oxide itself was 0.28ml/g, the oil absorption of AP spheres impregnated with iron oxide in PLGA was 0.48ml/g, which was almost doubled. This is because an effect is produced by forming a large number of pores on the surface and inside of the composite powder to maintain the porosity although the AP spheres contain 80% of iron oxide. Therefore, when the AP spheres are used, fine dust contained in sebum can be sucked in a large amount as compared with the iron oxide alone, and since fine dust is trapped in pores, an effect of isolating harmful fine dust from skin is remarkable.

Experimental example-simulation of heavy metal inhalation

To confirm whether dust particles can be inhaled into the AP sphere, the AP sphere was allowed to fully absorb five heavy metal standard solutions (200 ppm of cadmium, mercury, antimony, lead and arsenic, respectively) for 1 hour, and then dried, and the different colors of each element were qualitatively analyzed by SEM-EDX Mapping (electron microscope elemental analysis), and the results are shown in FIG. 5. The test results can confirm that the five heavy metal elements are practically and uniformly distributed in the AP sphere.

Experimental example-evaluation of dust removal performance

First, a metal mold for forming a pore model was prepared to have a plurality of artificial pores having a diameter of 50 μm and a plurality of artificial pores having a diameter of 200 μm, and then polydimethylsiloxane (PDMS; using

184 (Sigma, usa) as a raw material) was applied to the mold, and after PDMS was completely cured, it was separated from the mold, thereby obtaining a pore model. In addition, using carbon black nanoparticles of 500nm or less as a dust simulating material, the dust removing performance of the AP spheres was evaluated as follows, as shown in fig. 6.

1) By mixing the components in a specific ratio (MCT oil: b.g.: carbon black = 77.9:20.8:1.3 MCT (medium chain triglyceride oil ) oil, b.g. (Butylene Glycol) and carbon black were mixed to prepare a dust solution.

2) In addition to the dust solution prepared in 1) above, AP spheres (plga+iron oxide) and MCT oil were additionally mixed in a ratio of 50:50 to prepare a composition comprising a porous composite powder for dust removal.

3) The surface of the pore model is coated with a fine dust solution, and then coated with a composition containing a porous composite powder for removing fine dust.

4) After rubbing the surfaces of the pore model 30 times respectively with the wet tissue and the magnet (1000 gauss) wrapped with the wet tissue, the surfaces were observed under a microscope.

As can be seen with reference to fig. 6a and 6b, when removed with wet wipes alone, the soot in the pores is hardly removed, whereas when removed with magnets wrapped with wet wipes, the majority of soot in the pores is removed. From this, it was confirmed that the porous particles to which magnetism was imparted, i.e., AP spheres, could inhale carbon black inside the hair pore model body and easily fall out of pores by applying magnetic force from the outside.

Experimental example-measurement of magnetization

The iron oxide impregnation ratios in the AP spheres prepared in the examples were 50 wt%, 80 wt% and 100 wt% (when 100%, used as iron oxide samples for comparison of relative magnetism only) and the magnetization was measured. As can be determined with reference to fig. 9, the magnetization is proportional to the proportion of magnetic particles (iron oxide), and when 80 wt% of iron oxide is impregnated as prepared in the example, the magnetization is reduced to about 80% as compared to 100 wt% of iron oxide.

Claims

1. Use of a porous composite powder in the preparation of a composition for removing dust, the composition comprising a porous composite powder, wherein the porous composite powder comprises: a polymer; and magnetic particles impregnated in the polymer,

the composition for removing fine dust is obtained by removing fine dust from skin by using a magnet applicator.

2. The use according to claim 1, wherein the polymer is selected from one or more of polymethyl methacrylate (PMMA), polystyrene (PS), polyvinylpyrrolidone (PVP), polycaprolactone (PCL), polylactic acid (PLA), and lactic acid/glycolic acid copolymer (PLGA).

3. The use according to claim 1, wherein the polymer is a biodegradable polymer.

4. Use according to claim 3, characterized in that the biodegradable polymer is selected from one or more of Polycaprolactone (PCL), polylactic acid (PLA), and lactate/glycolate copolymer (PLGA).

5. The use according to claim 1, wherein the magnetic particles are selected from iron, nickel, cobalt, mnFe ₂ O ₄ 、BaO·6Fe ₂ O ₃ One or more of aluminum alloy, titanium alloy, copper alloy, and iron oxide.

6. Use according to claim 1, characterized in that the magnetic particles are Fe ₃ O ₄ 。

7. Use according to claim 1, characterized in that the impregnation ratio of the magnetic particles is 50-90% by weight, based on the total weight of the porous composite powder.

8. The use according to claim 1, wherein the particle size of the porous composite powder is 10-100 μm.

9. The use according to claim 1, characterized in that the pore size in the porous composite powder is 100nm-10 μm.

10. The use according to claim 1, wherein the porous composite powder has a porosity of 30-80%.

11. The use according to claim 1, wherein the porous composite powder has a magnetization of 30-70emu/g.

12. The use according to claim 1, wherein the porous composite powder removes fine dust having a particle diameter of 2.5 μm or less.

13. Use according to claim 1, characterized in that the porous composite powder is present in an amount of 30-70% by weight, based on the total weight of the composition.

14. The use according to claim 1, wherein the composition is a cosmetic composition.

15. A method for removing dust particles, comprising the steps of:

applying a composition comprising a porous composite powder to the skin; a kind of electronic device with high-pressure air-conditioning system

By using a magnet applicator to detach the porous composite powder from the skin,

wherein the porous composite powder comprises: a polymer; and magnetic particles impregnated in the polymer.

16. The method of claim 15, wherein the polymer is selected from one or more of polymethyl methacrylate (PMMA), polystyrene (PS), polyvinylpyrrolidone (PVP), polycaprolactone (PCL), polylactic acid (PLA), and lactic acid/glycolic acid copolymer (PLGA).

17. The method of claim 15, wherein the polymer is a biodegradable polymer.

18. The method of claim 17, wherein the biodegradable polymer is selected from one or more of Polycaprolactone (PCL), polylactic acid (PLA), and lactate/glycolate copolymer (PLGA).

19. The method of claim 15, wherein the magnetic particles are selected from the group consisting of iron, nickel, cobalt, mnFe ₂ O ₄ 、BaO·6Fe ₂ O ₃ One or more of aluminum alloy, titanium alloy, copper alloy, and iron oxide.

20. The method of claim 15, wherein the magnetic particles are Fe ₃ O ₄ 。

21. The method according to claim 15, wherein the impregnation ratio of the magnetic particles is 50 to 90 wt% based on the total weight of the porous composite powder.

22. The method of claim 15, wherein the porous composite powder has a particle size of 10-100 μm.

23. The method of claim 15, wherein the pore size within the porous composite powder is 100nm-10 μιη.

24. The method of claim 15, wherein the porous composite powder has a porosity of 30-80%.

25. The method of claim 15, wherein the porous composite powder has a magnetization of 30-70emu/g.

26. The method according to claim 15, wherein the porous composite powder removes fine dust having a particle size of 2.5 μm or less.

27. The method of claim 15, wherein the porous composite powder is present in an amount of 30-70 wt% based on the total weight of the composition.

28. The method of claim 15, wherein the composition is a cosmetic composition.