CN110812276A

CN110812276A - Porous composite powder for removing dust particles and preparation method thereof

Info

Publication number: CN110812276A
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: 2020-02-21
Anticipated expiration: 2039-08-09
Also published as: JP2020026429A; KR20200017820A; JP7510250B2; CN110812276B

Abstract

The porous composite powder for removing the micro-dust is characterized in that magnetic particles are uniformly immersed in a polymer with multiple pores in a single spraying process, so that the micro-dust is absorbed into the pores when the porous composite powder is applied to the skin, and then the porous composite powder is easily peeled off from the skin by using a magnet applicator, so that the micro-dust remained in the skin and pores is effectively removed.

Description

Porous composite powder for removing dust particles and preparation method thereof

Technical Field

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

Background

If the dust is accumulated in the body, the immunity of the human body is reduced, and various diseases such as heart diseases, respiratory diseases and the like are induced. Even bronchoconstriction can be caused, increasing the incidence of asthma or lung disease, and early mortality if inhaled for a long period.

The skin, the outermost layer of our body in direct contact with dust, acts as a barrier between the organism and the environment, and this barrier is poorly functional if often exposed directly to contamination. In particular, the fine dust is 20 times smaller than pores, so it easily penetrates into the skin. In fact, atmospheric pollutants such as motes have a serious impact on skin health. In the short term, it causes early aging of the skin, lack of water, and increase of fine lines and wrinkles, and in the long term, it causes severe diseases such as skin cancer, etc. due to irreversible skin damage, it loses the function of protecting the body from environmental factors.

In particular, although most of dust accumulated on the skin can be removed using conventional various detergents, it is difficult to remove fine dust entering pores of the hairs. Therefore, there is a need to develop a functional composite powder structure to effectively remove harmful substances, i.e., fine dusts, remaining in pores, which harm the skin and may cause fatal damage to the human body. In addition, because it is a material that acts within the pores, it is important to select a safer biocompatible material that is non-irritating.

[ Prior art documents ]

[ patent document ]

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

Disclosure of Invention

Technical problem

In one aspect, the present invention is directed to effectively absorb sebum and the like containing fine dust adhering 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 dusts remaining in the skin and pores by using a porous composite powder containing magnetic particles and a magnet applicator.

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

Technical scheme

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 above porous composite powder.

In another aspect, the present invention provides a method of removing fine dust, the method comprising: applying the above composition to the skin; and (3) using a magnet applicator to enable the porous composite powder to fall off from the skin.

On the other hand, the invention also provides a preparation method of the porous composite powder for removing the micro 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 prepared by uniformly impregnating magnetic particles in a porous polymer to absorb sebum containing fine dust into pores, and then easily peeling off the sebum from the skin using a magnet applicator, thereby effectively removing the fine dust remaining in the skin and pores.

Drawings

Fig. 1 shows a schematic view 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 the porous composite powder according to the present invention, and fig. 2b is a further enlarged surface image.

FIGS. 3a and 3b show photographs of an oil absorption measuring apparatus (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 common iron oxide and the porous composite powder (PLGA + iron oxide) according to the present invention.

Fig. 5a to 5f show EDX mapping images after the porous composite powder according to the present invention was sufficiently absorbed with a solution containing five heavy metals (cadmium, mercury, antimony, lead, arsenic).

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

Fig. 7 is a schematic view showing 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 shuttling) for removing dust particles from the porous composite powder according to the present invention.

Fig. 9 shows the results of measuring the magnetic properties 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 particle" refers to Ferromagnetic (iron, nickel, cobalt, etc.) and Ferrimagnetic (Fe)₂O₃、MnFe₂O₄、BAO₆Fe₂O₃Etc.), Paramagnetic (aluminum, titanium, copper alloys, etc.), superparamagnetic (Fe)₃O₄Etc.) and 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 for fine particles mixed in air, and generally refers to suspended matter having a particle size of 10mm or less. In particular, it is called fine dust when the particle size is 10 μm or less, ultrafine dust when the particle size is 2.5 μm or less, and ultrafine dust when the particle size is 0.1 μm or less. The particle diameter may be an average value of particle diameters of the respective particles in the fine dust. The dust includes materials derived from the nature such as sand, soil and pollen, or materials derived from industrial processes such as carbon-carbon combustion products, metal salts and heavy metals. The dust may be present in the form of a fine dust (fume), mist, smoke, vapour or fog.

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

In the present specification, when a certain portion is referred to as "including" a certain element, it should be understood that other elements are not intended to be excluded but may be included unless otherwise specified.

Detailed description of exemplary embodiments

Hereinafter, the present invention will be described in detail.

Porous composite powder for removing dust particles

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

By using the conventional porous silica or porous polymer particles, fine dust present in the pores of the hair can be sucked together with sebum, but the fatal problem is that it is difficult to remove the porous particles that have entered the pores of the hair.

In order to overcome the above problems, the present inventors have invented a porous composite powder for removing fine dust by uniformly impregnating magnetic particles having magnetism into a porous polymer, then penetrating the same into pores, sucking fine dust mixed with sebum by using a capillary phenomenon, and then easily taking out the porous composite powder from the pores by using a magnet applicator so as to safely peel off 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 great advantage of the present technology is that biodegradable polymers can be used for the polymer to maximize skin affinity (fig. 7).

In one embodiment, the polymer is one or more selected from the group consisting of Polymethylmethacrylate (PMMA), Polystyrene (PS), polyvinylpyrrolidone (PVP), Polycaprolactone (PCL), polylactic acid (PLA), and poly (lactic-co-glycolic acid) (PLGA), but is not limited thereto, so long as it is soluble in anhydrous dichloromethane, ethanol, acetone, and the like.

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

In one embodiment, the magnetic particles may be selected from iron, nickel, cobalt, MnFe₂O₄、BaO·6Fe₂O₃One or more of aluminum alloy, titanium alloy, copper alloy, and iron oxide, and may preferably be Fe₃O_4。

In one embodiment, the magnetic particles may have an impregnation rate of 50 to 90 wt%, for example, 55 wt% or more, 60 wt% or more, 65 wt% or more, or 70 wt% 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%, the porous composite powder having sebum absorbed therein may be difficult to remove from pores due to its weak magnetic properties. If the impregnation rate is more than 90% by weight, although the magnetic properties are increased, the sebum absorption amount may be reduced.

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 size is less than 10 μm, it may be difficult to sufficiently absorb sebum and the like containing fine dust on the skin, and if the particle size is more than 100 μm, a granular feeling or a foreign body feeling may be felt when applied to the skin.

In one embodiment, the pore size within a plurality of the porous composite powders may be 100nm to 10 μm, for example, may be 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 highly likely that particles are easily broken due to a decrease in mechanical strength.

In one embodiment, the Average pore size (4V/A) in the porous composite powder may be 0.01 to 2 μm, for example, 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 porosity of the porous composite powder may be 30-80%, for example, may be 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 is the total proportion of pores capable of actually sucking sebum containing fine dust, and if the porosity is lower than 30%, the effect of removing the fine dust may be very little; if it exceeds 80%, the mechanical strength is lowered, resulting in a high possibility of deformation or brittleness of the pellets.

In one embodiment, the magnetization value of the porous composite powder measured by the magnetometer may be 30-70emu/g, for example, may be 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 into which sebum containing fine dust is inhaled, 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 size penetrates into pores, the porous composite powder according to the present invention can suck the fine dust mixed with sebum in the pores by capillary phenomenon, and can be easily taken out from the pores by using a magnet applicator described later, thereby easily removing harmful substances from the skin.

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

In one embodiment, the porous composite powder may be present in an amount of 30 to 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 significant; if it is more than 70 wt%, a foreign body sensation may be felt and it may be harmful to the skin.

In one embodiment, the composition may be a cosmetic composition in the form of a formulation comprising a cosmetically or dermatologically acceptable medium or base. The cosmetic composition may be in all forms suitable for topical application, for example in the form of a solution, a gel, a solid, a paste-like anhydrous product, an emulsion obtained by dispersing an oily phase in an aqueous phase, a suspension, a microemulsion, microcapsules, fine particles, ionic (liposomes) and non-ionic vesicular dispersions, or it may also be in the form of a cream, lotion, emulsion, powder, ointment, spray or concealer stick. These compositions may be prepared by methods conventional in the art. The compositions according to the invention may also be used in the form of foams, or in the form of aerosol compositions containing compressed propellants.

The formulation of the cosmetic composition according to an embodiment of the present invention is not particularly limited, and for example, the cosmetic composition may be formulated into a formulation of smoothing toner, astringent toner, skin lotion, nourishing cream, massage cream, essence, eye cream, eye essence, cleansing cream, cleansing foam, cleansing water, cleansing wet sheet, pack, powder, body lotion, body cream, body oil, body essence, and the like containing the cosmetic composition.

When the dosage form of the present invention is a paste, cream or gel, animal fibers, plant fibers, waxes, paraffin, starch, tragacanth, cellulose derivatives, polyethylene glycol, silicone, bentonite, silica, talc or zinc oxide, and the like, may be used as a carrier component.

When the formulation of the present invention is a powder or spray, lactose, talc, silicon dioxide, aluminum hydroxide, calcium silicate or polyamide powder may be used as a carrier component. In particular, when the formulation 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-butylene glycol oil, glycerol fatty acid ester, polyethylene glycol, or fatty acid ester 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 metahydroxide), bentonite, agar, tragacanth, or the like may be used.

When the formulation of the present invention is a surfactant-containing detergent, aliphatic alcohol sulfate, aliphatic alcohol ether sulfate, sulfosuccinic acid monoester, isethionate, imidazoline derivative, methyltaurate, sodium lauroyl sarcosinate, fatty acid amide ether sulfate, alkylamidobetaine, fatty alcohol, fatty acid glyceride, fatty acid diethanolamide, vegetable oil, lanolin derivative, or ethoxylated glycerin fatty acid ester, and the like may be used as the carrier component.

The cosmetic composition according to the embodiment of the present invention may further include a functional additive and an ingredient 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, high molecular peptides, high molecular polysaccharides, sphingolipids and seaweed extracts.

The cosmetic composition of the present invention may contain, in addition to the functional additives, components contained in a usual cosmetic composition as needed. For example, other ingredients included in the composition may be an oil component, a moisturizer, an emollient, a surfactant, organic and inorganic pigments, organic powders, an ultraviolet absorber, a preservative, a bactericide, an antioxidant, a plant extract, a pH adjuster, ethanol, a pigment, a blood circulation promoter, a coolant, an 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 exfoliating the porous composite powder from the skin by using a magnetic applicator.

The magnet applicator may be in the shape of a short, thick spoon, but is not limited thereto. Further, by using a neodymium magnet, the bottom surface of the head can be made to have magnetism of 2000-4000G, but is not limited thereto.

Preparation method of porous composite powder for removing dust particles

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

Specifically, according to reference to fig. 1, the macromolecule is dissolved in an organic solvent such as DCM to prepare a solution containing the macromolecule, and the 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, so that a porous composite powder for removing fine dust can be prepared.

According to the spray drying technology, the porous composite powder in which the magnetic particles are uniformly impregnated in the 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 the spray drying is performed under the conditions of a Feed rate (Feed rate) of 20%, and an Aspirator (Aspirator) of 70%, 20 atm.

In one embodiment, the spray drying is performed by stirring the solution in which the magnetic particles are dispersed in a container before the inflow operation using a pump, so as to prevent the magnetic particles from being deposited 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 (dichromethane anhydride), ethanol and acetone, and may preferably be anhydrous Dichloromethane.

In one embodiment, after the spray drying step, a methanol washing and tray drying step may also be included. By this step, a porous composite powder in which the remaining solution was completely removed was obtained.

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

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

In one embodiment, the composition for removing 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 only examples to aid understanding of the present invention, and the scope and scope of the present invention are not limited thereto.

Example-preparation of porous composite bodies for removing dust particles

First, magnetic particles (iron oxide, DAITO KASEI), a lactic acid/glycolic acid copolymer (PLGA, GALACTIC), and anhydrous dichloromethane (DCM, Sigma-Aldrich, purity > 99.8%) were prepared, and a lactic acid/glycolic acid copolymer (PLGA) composite powder (hereinafter referred to as AP sphere) impregnated with the magnetic particles was prepared according to the following procedure.

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 in which the magnetic particles were dispersed was spray-dried by using a home-made spray dryer (see fig. 1).

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

5) At Feed rate (Feed rate): 20 percent; aspirator (Aspirator): spray drying at 70% and 20 atm. In the spray drying, the PLGA solution in which the magnetic particles are dispersed is continuously stirred by using a stirrer.

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

< surface Observation of porous composite powder >

Referring to fig. 2a and 2b, it can be confirmed from the surface photographs that iron oxide particles are densely impregnated therein even though pores having a size of several hundreds nanometers are formed. In addition, when the sample is iron oxide: when PLGA is 80:20, since the actual loss on ignition (loss) measured by treating 1g of the sample at 500 ℃ for 180 minutes and measuring the weight loss after complete combustion of the polymer was 19 to 21%, it was confirmed that the iron oxide was uniformly impregnated in the composite powder.

< determination of pore Structure of porous composite component >

From the results of determining the pore structure of the AP sphere, according to FIGS. 10a and 10b, the total intrusion volume (TotalIntrusion volume) was 0.62mL/g, which was confirmed to be similar to the level of oil absorption (0.48mL/g) measured using an oil absorption measuring apparatus (S-500, Asahi Souken, FIGS. 3a and 3b) described later. Furthermore, the average pore size (average pore diameter (4V/A)) was 0.33 μm, which was found to be similar to the pore size on the SEM images described above (FIGS. 2a and 2 b).

The Porosity (Porosity), i.e., the total percentage of pores that can actually absorb sebum, in this example was 61%, which is an effect of maintaining the internal pore structure while impregnating 80% of the iron oxide particles.

Experimental example-measurement of oil absorption

In order to examine whether the AP spheres can effectively suck sebum containing fine dust into the air holes, the oil absorption of MCT oil (cas. no73398-61-5), which most closely approximates the physical properties of sebum, was measured by using a conventional oil absorption measuring device (S-500, Asahi Souken, fig. 3a and 3b) 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 in the sample chamber.

2) When the oil absorption measuring device starts to operate, the oil pump adds oil drop by drop into the chamber, in which two stirrers rotate and stir the powder and the oil.

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

4) At this time, the oil amount (ml) corresponding to 70% of the maximum torque was divided by the sample amount (g) to calculate the oil absorption (ml/g) of the powder. 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.

It can be confirmed from fig. 4 that although the oil absorption of iron oxide itself is 0.28ml/g, the oil absorption of AP spheres impregnated with iron oxide in PLGA is 0.48ml/g, almost increased by two times. This is because the AP spheres contain 80% of iron oxide, but have an effect of maintaining porosity by forming a large number of pores on the surface and inside of the composite powder. Therefore, when the AP spheres are used, the fine dusts contained in sebum can be absorbed in a large amount, as compared with the use of iron oxide alone, and the effect of isolating harmful fine dusts from the skin is remarkable because the fine dusts are captured in the pores.

Experimental example-simulation of heavy Metal inhalation

In order to confirm whether or not the AP spheres can absorb the fine dust, the AP spheres were dried after fully absorbing five heavy metal standard solutions (200 ppm of cadmium, mercury, antimony, lead, and arsenic, respectively) for 1 hour, and then qualitatively analyzed for different colors of each element by SEM-EDX Mapping (electron microscopy elemental analysis), and the results are shown in fig. 5. The test results confirmed that the five heavy metal elements were actually uniformly distributed within the AP sphere.

Experimental example-evaluation of Performance for removing dust particles

First, a metal mold having a pore pattern for making artificial pores having a diameter of 50 μm and a plurality of pores was preparedArtificial pores with a diameter of 200 μm, and then polydimethylsiloxane (PDMS; applied

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

1) The oil was prepared by mixing the following components in a specific ratio (MCT oil: B.G.: carbon black 77.9: 20.8: 1.3) MCT (Medium Chain Triglyceride oil), B.G (Butylene Glycol) and carbon black were mixed to make a mote solution.

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

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

4) And respectively rubbing the surface of the pore model with a wet tissue and a magnet (1000 gauss) wrapped by the wet tissue for 30 times, and observing the surface under a microscope.

As can be observed from reference to fig. 6a and 6b, when removed with a wet wipe alone, the carbon black within the pores was barely removed, whereas when removed with a magnet wrapped with a wet wipe, most of the carbon black within the pores was removed. From this, it was confirmed that the porous particles imparted with magnetism, i.e., the AP spheres, can absorb the carbon black in the interior of the pore model body and easily fall off from the pores by applying a magnetic force from the outside.

Experimental examples-measurement of magnetization

The iron oxide impregnation ratio in the AP spheres prepared in examples was 50 wt%, 80 wt%, and 100 wt% (when it was 100%, used as an iron oxide sample only for comparison of relative magnetism), and the magnetization was measured. As can be confirmed by referring to fig. 9, the magnetization is proportional to the proportion of the magnetic particles (iron oxide), and as prepared in the examples, when iron oxide is impregnated at 80 wt%, the magnetization is reduced to about 80% compared to 100 wt% of iron oxide.

Claims

1. A porous composite powder for removing fine dust, comprising: a polymer; and magnetic particles impregnated in the polymer.

2. The porous composite powder for removing fine dust according to claim 1, wherein the polymer is one or more selected from the group consisting of Polymethylmethacrylate (PMMA), Polystyrene (PS), polyvinylpyrrolidone (PVP), Polycaprolactone (PCL), polylactic acid (PLA), and poly (lactic-co-glycolic acid) (PLGA).

3. The porous composite powder for removing fine dust according to claim 1, wherein the polymer is a biodegradable polymer.

4. The porous composite powder for removing fine dust according to claim 3, wherein the biodegradable polymer is one or more selected from Polycaprolactone (PCL), polylactic acid (PLA), and polylactic-co-glycolic acid (PLGA).

5. The porous composite powder for removing fine dust according to claim 1, wherein the magnetic particles are selected from iron, nickel, cobalt, MnFe₂O₄、BaO·6Fe₂O₃One or more of aluminum alloy, titanium alloy, copper alloy, and iron oxide.

6. The porous composite powder for removing fine dust according to claim 1, wherein the magnetic particles are Fe₃O₄。

7. The porous composite powder for removing fine dust according to claim 1, wherein the impregnation ratio of the magnetic particles is 50 to 90% by weight based on the total weight of the porous composite powder.

8. The porous composite powder for removing fine dust according to claim 1, wherein the particle size of the porous composite powder is 10 to 100 μm.

9. The porous composite powder for removing fine dust according to claim 1, wherein the size of pores in the porous composite powder is 100nm to 10 μm.

10. The porous composite powder for removing fine dust according to claim 1, wherein the porosity of the porous composite powder is 30 to 80%.

11. The porous composite powder for removing fine dust according to claim 1, wherein the magnetization of the porous composite powder is 30 to 70 emu/g.

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

13. A composition for removing fine dust comprising the porous composite powder according to any one of claims 1 to 12.

14. The composition for removing fine dust according to claim 13, wherein the content of the porous composite powder is 30 to 70 wt% based on the total weight of the composition.

15. A composition for removing mote according to claim 13, characterized in that said composition is a cosmetic composition.

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

applying to the skin a composition according to claim 13; and

the porous composite powder is peeled off from the skin by using a magnet applicator.

17. A method for preparing a porous composite powder for removing fine dust according to any one of claims 1 to 12, comprising the steps of:

preparing a solution containing a polymer;

dispersing magnetic particles in a solution containing a polymer; and

the solution in which the magnetic particles are dispersed is spray-dried.

18. The method of claim 17, wherein the solution in which the magnetic particles are dispersed is stirred during the spray-drying process.

19. The method according to claim 17, wherein the solvent of the solution containing the polymer is one or more selected from the group consisting of anhydrous dichloromethane, ethanol, and acetone.

20. The method according to claim 17, further comprising washing and drying steps after the spray-drying step.

21. Use of a porous composite powder according to any one of claims 1 to 12 in the preparation of a composition for the removal of fine dust.

22. Use according to claim 21, wherein the porous composite powder is present in an amount of 30 to 70 wt.%, based on the total weight of the composition for removing fines.

23. Use according to claim 21, characterized in that the composition for removing mote is a cosmetic composition.