HAN KYU SANG (US)
| JP3123367U | 2006-07-20 | |||
| JP3088930U | 2002-10-04 | |||
| JP2001169823A | 2001-06-26 | |||
| US5928457A | 1999-07-27 | |||
| US5513664A | 1996-05-07 |
| [CLAIMS] [Claim l] A method for manufacturing an artificial nail using a thermoplastic material, the method comprising: mixing at least one metal nanoparticle selected from the group consisting of silver (Ag) , zinc (Zn) , selenium (Se) , and titanium oxide (TiO2) , coating the mixture on a thermoplastic material, drying, and extruding the mixture into a compounding chip or a master batch chip; and injection molding an artificial nail from the compounding chip or the master batch chip, wherein the injection molded artificial nail can maintain excellent antimicrobial activity on the surface thereof and, at the same time, achieve a desired color by preventing color contamination due to the nanoparticles . [Claim 2] The method of claim 1, wherein, in the case where the silver (Ag) nanoparticles are used solely, when silver nanoparticles having a particle size of 1 to 20 run are used, the amount of the silver nanoparticles used is 0.003 wt% to 0.012 wt% (30 ppm to 120 ppm) with respect to the total weight of the thermoplastic material used, when silver nanoparticles having a particle size of 21 to 80 nm are used, the amount of the silver nanoparticles used is 0.012 wt% to 0.015 wt% (120 ppm to 150 ppm) , and when silver nanoparticles having a particle size of 81 to 100 nm are used, the amount of the silver nanoparticles used is 0.015 wt% to 0.04 wt% (150 ppm to 400 ppm). [Claim 3] The method of claim 1, wherein, in the case where the silver (Ag) nanoparticles and the zinc (Zn) nanoparticles are used together, when silver nanoparticles having a particle size of 1 to 20 nm are used, the amount of the sliver nanoparticles used is 0.0005 wt% to 0.006 wt% (5 ppm to 60 ppm) and the amount of the zinc nanoparticles used is 0.02 wt% to 0.035 wt% (200 ppm to 350 ppm) with respect to the total weight of the thermoplastic material used, when silver nanoparticles having a particle size of 21 to 80 nm are used, the amount of the sliver nanoparticles used is 0.006 wt% to 0.01 wt% (60 ppm to 100 ppm) and the amount of the zinc nanoparticles used is 0.035 wt% to 0.045 wt% (350 ppm to 450 ppm) , and when silver nanoparticles having a particle size of 81 to 100 nm are used, the amount of the sliver nanoparticles used is 0.01 wt% to 0.025 wt% (100 ppm to 250 ppm) and the amount of the zinc nanoparticles used is 0.045 wt% to 0.07 wt% (450 ppm to 700 ppm) . [Claim 4] The method of claim 1, wherein, in the case where the silver (Ag) nanoparticles and the selenium (Se) nanoparticles are used together, when silver nanoparticles having a particle size of 1 to 20 ran are used, the amount of the sliver nanoparticles used is 0.0005 wt% to 0.006 wt% (5 ppm to 60 ppm) and the amount of the selenium nanoparticles used is 0.0025 wt% to 0.0035 wt% (25 ppm to 35 ppm) with respect to the total weight of the thermoplastic material used, when silver nanoparticles having a particle size of 21 to 80 ran are used, the amount of the sliver nanoparticles used is 0.006 wt% to 0.01 wt% (60 ppm to 100 ppm) and the amount of the selenium nanoparticles used is 0.0035 wt% to 0.005 wt% (35 ppm to 50 ppm), and when silver nanoparticles having a particle size of 81 to 100 nm are used, the amount of the sliver nanoparticles used is 0.01 wt% to 0.025 wt% (100 ppm to 250 ppm) and the amount of the selenium nanoparticles used is 0.005 wt% to 0.007 wt% (50 ppm to 70 ppm) . [Claim 5] The method of claim 1, wherein, in the case where the silver (Ag) nanoparticles and the titanium oxide (TiO2) nanoparticles are used together, when silver nanoparticles having a particle size of 1 to 20 nm are used, the amount of the sliver nanoparticles used is 0.0005 wt% to 0.006 wt% (5 ppm to 60 ppm) and the amount of the titanium oxide nanoparticles used is 0.015 wt% to 0.025 wt% (150 ppm to 250 ppm) with respect to the total weight of the thermoplastic material used, when silver nanoparticles having a particle size of 21 to 80 run are used, the amount of the sliver nanoparticles used is 0.006 wt% to 0.01 wt% (60 ppm to 100 ppm) and the amount of the titanium oxide nanoparticles used is 0.025 wt% to 0.045 wt% (250 ppm to 450 ppm), and when silver nanoparticles having a particle size of 81 to 100 nm are used, the amount of the sliver nanoparticles used is 0.01 wt% to 0.025 wt% (100 ppm to 250 ppm) and the amount of the titanium oxide nanoparticles used is 0.045 wt% to 0.08 wt% (450 ppm to 800 ppm) . [Claim 6] The method of any one of claims 1 to 5, wherein the process of coating the metal nanoparticles on the surface of the thermoplastic material is performed together with the drying process, the coating process in which the silver nanoparticles are used together with the zinc, selenium, or titanium oxide nanoparticles is divided into a coating process of the silver nanoparticles and a coating process of the other metal nanoparticles, and the coating process is performed by a coating apparatus at a rotation speed of 60 to 120 RPM at a drying temperature of 50 to 120 °C for 20 to 40 minutes including the drying time. [Claim 7] The method of claim 1, wherein, in the case where the silver nanoparticles are used together with the zinc nanoparticles, the selenium nanoparticles, or the titanium oxide nanoparticles and the mixture is extruded into a compounding chip or a master batch chip, the respective metal nanoparticles are separately mixed and dispersed on the thermoplastic material and supplied to an extrusion process . [Claim 8] The method of claim 1, wherein the amount of the master batch chip used is 5 to 10 wt% with respect to the total weight of the thermoplastic material used, and the amount of the compounding chip used is 100 wt% with respect to the total weight of the thermoplastic material used. |
[invention Title]
METHOD FOR MANUFACTURING ARTIFICIAL NAIL HAVING ANTIMICROBIAL AND COLORLESS FUNCTION WITH NANO METAL PARTICLES TREATED
[Technical Field]
The present invention relates to a method for manufacturing an artificial nail containing metal nanoparticles having an antimicrobial function and no color contamination and, more particularly, to a method for manufacturing an artificial nail, in which a colorless plastic master batch chip or compounding chip is prepared by- mixing metal nanoparticles with a plastic material, coating, extruding the mixture so as to prevent the nanoparticles from being aggregated, and then the master batch chip or the compounding chip is injection molded to form an artificial nail which can maintain excellent antimicrobial activity on the surface of the artificial plastic nail and, at the same time, achieve a desired color.
[Background Art]
Recently, women use various types of artificial plastic nails to decorate their nails by attaching the artificial plastic nails to their nails using an adhesive agent. The demand for these artificial nails increases due to their advantages of the diversity of size and color and easy detachability .
However, the conventional artificial plastic nails are problematic in that foreign materials such as organic materials are adsorbed and adhered between the finger nails as a part of the body and the artificial nails to grow microorganisms such as bacteria or fungi. Thus, there have been many attempts to solve these problems .
The flow of plastic resin in a mold during molding is not smooth compared to other injection molded products due to its small thickness. Therefore, if the particle size of an antimicrobial agent is more than a few micrometers, the failure rate of molded products is high.
Recently, although silver (Ag) nanoparticles are widely used as the antimicrobial agent for the plastic material, when silver nanoparticles are added to the plastic material, the intrinsic color of silver nanoparticles is exhibited to affect the color of the artificial nail products, and thus it is impossible to achieve a desired color.
That is, if the particle size of the silver decreases to the nanoparticle size, a surface plasmon phenomenon occurs to change the color of the solution from pale yellow to dark brown due to an interaction between the nanoparticles and light. Due to this phenomenon, the amount of silver nanoparticles used is increased to achieve excellent antimicrobial activity; however, in this case, the color contamination is increased, and thus the color of the product is changed to dark brown. Therefore, in order to provide an antimicrobial function due to metal nanoparticles including silver nanoparticles to the artificial nail, it is necessary to provide a method for manufacturing an artificial nail by preparing a colorless plastic master batch chip or compounding chip which can maintain excellent antimicrobial activity on the surface of an artificial plastic nail and, at the same time, achieve a desired color by preventing color contamination.
[Disclosure]
[Technical Problem]
The present invention has been made in an effort to solve the above-described problems associated with prior art, and an object of the present invention is to provide a method for manufacturing an artificial nail which can maintain excellent antimicrobial activity on the surface thereof and, at the same time, achieve a desired color by preventing color contamination.
That is, a primary object of the present invention is to provide a method for preventing silver (Ag) nanoparticles from being aggregated with each other when metal nanoparticles are coated and treated on a plastic material. In more detail, when zinc (Zn) , selenium (Se) , or titanium oxide (TiO 2 ) metal nanoparticles and polymer are mixed with the silver nanoparticles, the metal nanoparticles are coupled with the silver nanoparticles to prevent the growth of silver nanoparticles due to aggregation, thus preventing color contamination which is caused by the use of the silver nanoparticles . Therefore, an object of the present invention is to provide a method for manufacturing an artificial nail containing metal nanoparticles having an antimicrobial function and no color contamination in such a manner that at least one metal nanoparticle selected from the group consisting of silver (Ag) , zinc (Zn) , selenium (Se) , and titanium oxide (TiO 2 ) is mixed with a thermoplastic material, which is a raw material for artificial nails, and extruded into a master batch chip or compounding chip, and the master batch chip or compounding chip is mixed with the raw material for artificial nails in a predetermined ratio and injection molded.
[Technical Solution]
In one aspect, the present invention provides a method for manufacturing an artificial nail using a thermoplastic material, the method including: mixing at least one metal nanoparticle selected from the group consisting of silver (Ag) , zinc (Zn) , selenium (Se) , and titanium oxide (TiO 2 ) / coating the mixture on a thermoplastic material, drying, and extruding the mixture into a compounding chip or a master batch chip; and injection molding an artificial nail from the compounding chip or the master batch chip, wherein the injection molded artificial nail can maintain excellent antimicrobial activity on the surface thereof and, at the same time, achieve a desired color by preventing color contamination due to the nanoparticles .
In the case where the silver (Ag) nanoparticles are used solely, when silver nanoparticles having a particle size of 1 to 20 nm are used, the amount of the silver nanoparticles used may be 0.003 wt% to 0.012 wt% (30 ppm to 120 ppm) with respect to the total weight of the thermoplastic material used, when silver nanoparticles having a particle size of 21 to 80 nm are used, the amount of the silver nanoparticles used may be 0.012 wt% to 0.015 wt% (120 ppm to 150 ppm) , and when silver nanoparticles having a particle size of 81 to 100 nm are used, the amount of the silver nanoparticles used may be 0.015 wt% to 0.04 wt% (150 ppm to 400 ppm) .
In the case where the silver (Ag) nanoparticles and the zinc (Zn) nanoparticles are used together, when silver nanoparticles having a particle size of 1 to 20 ran are used, the amount of the sliver nanoparticles used is 0.0005 wt% to 0.006 wt% (5 ppm to 60 ppm) and the amount of the zinc nanoparticles used is 0.02 wt% to 0.035 wt% (200 ppm to 350 ppm) with respect to the total weight of the thermoplastic material used, when silver nanoparticles having a particle size of 21 to 80 ran are used, the amount of the sliver nanoparticles used is 0.006 wt% to 0.01 wt% (60 ppm to 100 ppm) and the amount of the zinc nanoparticles used is 0.035 wt% to 0.045 wt% (350 ppm to 450 ppm), and when silver nanoparticles having a particle size of 81 to 100 nm are used, the amount of the sliver nanoparticles used is 0.01 wt% to 0.025 wt% (100 ppm to 250 ppm) and the amount of the zinc nanoparticles used is 0.045 wt% to 0.07 wt% (450 ppm to 700 ppm) .
In the case where the silver (Ag) nanoparticles and the selenium (Se) nanoparticles are used together, when silver nanoparticles having a particle size of 1 to 20 nm are used, the amount of the sliver nanoparticles used may be 0.0005 wt% to 0.006 wt% (5 ppm to 60 ppm) and the amount of the selenium nanoparticles used may be 0.0025 wt% to 0.0035 wt% (25 ppm to 35 ppm) with respect to the total weight of the thermoplastic material used, when silver nanoparticles having a particle size of 21 to 80 nm are used, the amount of the sliver nanoparticles used may be 0.006 wt% to 0.01 wt% (60 ppm to 100 ppm) and the amount of the selenium nanoparticles used may be 0.0035 wt% to 0.005 wt% (35 ppm to 50 ppm) , and when silver nanoparticles having a particle size of 81 to 100 nm are used, the amount of the sliver nanoparticles used may be 0.01 wt% to 0.025 wt% (100 ppm to 250 ppm) and the amount of the selenium nanoparticles used may be 0.005 wt% to 0.007 wt% (50 ppm to 70 ppm) .
In the case where the silver (Ag) nanoparticles and the titanium oxide (TiO 2 ) nanoparticles are used together, when silver nanoparticles having a particle size of 1 to 20 nm are used, the amount of the sliver nanoparticles used may be 0.0005 wt% to 0.006 wt% (5 ppm to 60 ppm) and the amount of the titanium oxide nanoparticles used may be 0.015 wt% to 0.025 wt% (150 ppm to 250 ppm) with respect to the total weight of the thermoplastic material used, when silver nanoparticles having a particle size of 21 to 80 nm are used, the amount of the sliver nanoparticles used may be 0.006 wt% to 0.01 wt% (60 ppm to 100 ppm) and the amount of the titanium oxide nanoparticles used may be 0.025 wt% to 0.045 wt% (250 ppm to 450 ppm) , and when silver nanoparticles having a particle size of 81 to 100 nm are used, the amount of the sliver nanoparticles used may be 0.01 wt% to 0.025 wt% (100 ppm to 250 ppm) and the amount of the titanium oxide nanoparticles used may be 0.045 wt% to 0.08 wt% (450 ppm to 800 ppm) . The process of coating the metal nanoparticles on the surface of the thermoplastic material may be performed together with the drying process, the coating process in which the silver nanoparticles are used together with the zinc, selenium, or titanium oxide nanoparticles may be divided into a coating process of the silver nanoparticles and a coating process of the other metal nanoparticles, and the coating process may be performed by a coating apparatus at a rotation speed of 60 to 120 RPM at a drying temperature of 50 to 120 ° C for 20 to 40 minutes including the drying time.
In the case where the silver nanoparticles are used together with the zinc nanoparticles, the selenium nanoparticles, or the titanium oxide nanoparticles and the mixture is extruded into a compounding chip or a master batch chip, the respective metal nanoparticles may be separately mixed and dispersed on the thermoplastic material and supplied to an extrusion process.
The amount of the master batch chip used may be 5 to 10 wt% with respect to the total weight of the thermoplastic material used, and the amount of the compounding chip used may be 100 wt% with respect to the total weight of the thermoplastic material used.
[Advantageous Effects] The present invention provides a method for manufacturing an artificial nail which can maintain excellent antimicrobial activity on the surface thereof and, at the same time, achieve a desired color by preventing color contamination. Therefore, it is possible to manufacture artificial nails of various colors, which have no color contamination caused by an antimicrobial agent and, at the same time, prevent infection from bacteria or fungi. As a result, the present invention provides a variety of sanitary artificial nails, which allow women to express their individuality, in the field of so-called Λ Nail art' to decorate nails.
[Description of Drawings] FIG. 1 is a transmission electron microscopy (TEM) image of silver nanoparticles having a particle size of about 7 nm used in a method for manufacturing an artificial nail containing metal nanoparticles having an antimicrobial function and no color contamination in accordance with the present invention.
FIG. 2 is a transmission electron microscopy (TEM) image of zinc nanoparticles having a particle size of less than 10 nm used in a method for manufacturing an artificial nail containing metal nanoparticles having an antimicrobial function and no color contamination in accordance with the present invention.
FIG. 3 is a transmission electron microscopy (TEM) image of selenium nanoparticles having a particle size of less than 50 run used in a method for manufacturing an artificial nail containing metal nanoparticles having an antimicrobial function and no color contamination in accordance with the present invention.
FIG. 4 is a transmission electron microscopy (TEM) image of titanium oxide nanoparticles having a particle size of less than 70 nm used in a method for manufacturing an artificial nail containing metal nanoparticles having an antimicrobial function and no color contamination in accordance with the present invention.
FIG. 5 is a transmission electron microscopy (TEM) image of an artificial plastic nail sample, in which the growth of silver nanoparticles is prevented due to the coupling between nanoparticles when silver nanoparticles and selenium nanoparticles are used together.
[Mode for Invention]
Hereinafter, preferred embodiments in accordance with the present invention will be described with reference to the accompanying drawings .
An object of the present invention is to provide a method for manufacturing an artificial nail which can maintain excellent antimicrobial activity and achieve a desired color. For this purpose, silver (Ag) nanoparticles as a main material are mixed with one metal nanoparticle selected from the group consisting of silver (Ag) , zinc (Zn) , selenium (Se) , and titanium oxide (TiO2) in a predetermined ratio and coated on a thermoplastic material, which is a raw material for artificial nails.
Here, it is important to select metal nanoparticles capable of preventing the growth of silver nanoparticles and maintaining excellent antimicrobial activity and mix the selected metal nanoparticles with the silver nanoparticles in an appropriate ratio.
Moreover, there are various methods of mixing plastic additives; however, in the present invention, the amounts of the respective metal nanoparticles used are determined according to the particle sizes of the silver nanoparticles, and the respective metal nanoparticles are separately coated on the thermoplastic material .
After the coating process, the mixture is extruded into a master batch chip or compounding chip by a known process. At this time, the plastic material coated with the silver nanoparticles and the plastic material coated with other metal nanoparticles are mixed in an optimum ratio by varying the amounts of the respective materials used and, then, extruded into a master batch chip or compounding chip. Finally, the master batch chip or compounding chip is mixed with a raw material for artificial nails in a predetermined ratio and then injection molded. As a result, the present invention provides artificial nails which can maintain excellent antimicrobial activity on the surface thereof and, at the same time, achieve a desired color by preventing color contamination due to the nanoparticles .
The method for manufacturing an artificial nail containing metal nanoparticles having an antimicrobial function and no color contamination will be described in more detail below.
1. Metal nanoparticles used in the present invention include silver (Ag) , zinc (Zn) , selenium (Se) , and titanium oxide (TiO 2 ) nanoparticles. When the silver (Ag) nanoparticles are mixed with other metal nanoparticles and polymer, the silver (Ag) nanoparticles are coupled with the metal nanoparticles to prevent the particle growth. Thus, in the present invention, zinc (Zn) , selenium (Se) , and titanium oxide (TiO 2 ) nanoparticles are selected from metal nanoparticles capable of improving antimicrobial activity and coupling effect.
2. Plastic materials used in the present invention to manufacture artificial nails are thermoplastic materials having transparency and durability such as polypropylene (PP) , polyethylene (PE) , acrylonitrile-butadiene-styrene (ABS), styrene-acrylonitrile (SAN), polycarbonate (PC), polystyrene (HIPS, GPPS), polyethersulfone (PES), polyethylene terephthalate (PET) , etc.
3. Metal nanoparticles used in the present invention are as follows. a. Silver (Ag) having a particle size of less than 100 run is used. More preferably, silver nanoparticles of about 1 to 10 run are used to improve the antibacterial and bactericidal activities. FIG. 1 is a transmission electron microscopy (TEM) image of silver nanoparticles having a particle size of about 7 ran. b. Zinc (Zn) having a particle size of less than 100 nm is used. In general, zinc is widely used as an inorganic antimicrobial agent, and zinc nanoparticles improve the antimicrobial effect. FIG. 2 is a TEM image of zinc nanoparticles having a particle size of less than 10 nm. c. Selenium (Se) having a particle size of less than 50 nm is used. Selenium is known to have antioxidative activity, and it was found that selenium nanoparticles have excellent antimicrobial activity even at low concentration. FIG. 3 is a TEM image of selenium nanoparticles having a particle size of less than 50 nm. d. Titanium oxide (TiO 2 ) having a particle size of less than 100 ran and Anatase type is used. It is generally known that, when titanium oxide absorbs ultraviolet rays, the oxidation and reduction reactions occurs at the interface between the titanium and the oxide, and thus it exhibits antimicrobial activity and decomposes organic materials. FIG. 4 is a TEM image of titanium oxide nanoparticles having a particle size of less than 70 nm. FIG. 5 is a TEM image of an artificial plastic nail sample, in which the growth of silver nanoparticles is prevented due to the coupling between the metal nanoparticles when the silver nanoparticles and the selenium nanoparticles are used together.
4. The above-described metal nanoparticles are used in the artificial nails as final products in the following ratios in order to manufacture artificial nails containing metal nanoparticles having an antimicrobial function and no color contamination. a. In the case where the silver (Ag) nanoparticles are used solely, the amounts of the silver (Ag) nanoparticles mixed with the artificial nails as final products are shown in the following Table 1. When silver nanoparticles having a particle size of 1 to 20 nm are used, the amount of the silver nanoparticles used is 0.003 wt% to 0.012 wt% (30 ppm to 120 ppm) and, when silver nanoparticles having a particle size of 21 to 80 nm are used, the amount of the silver nanoparticles used is 0.012 wt% to 0.015 wt% (120 ppm to 150 ppm) . Moreover, when silver nanoparticles having a particle size of 81 to 100 nm are used, the amount of the silver nanoparticles used is 0.015 wt% to 0.04 wt% (150 ppm to 400 ppm) .
[Table 1]
Ratios of silver nanoparticles mixed with final product when silver nanoparticles are used solely
b. In the case where the silver nanoparticles are mixed with one metal nanoparticle selected from the group consisting of zinc (Zn), selenium (Se), and titanium oxide (TiC> 2 ) , the ratios of nanoparticles mixed with the artificial nails are shown in the following Table 2. The amounts of the respective metal nanoparticles are differentiated according to the amounts of silver nanoparticles used.
That is, in the case where the silver (Ag) nanoparticles and the zinc (Zn) nanoparticles are used together, when silver nanoparticles having a particle size of 1 to 20 nm are used, the amount of the sliver nanoparticles used is 0.0005 wt% to 0.006 wt% (5 ppm to 60 ppm) and the amount of the zinc nanoparticles used is 0.02 wt% to 0.035 wt% (200 ppm to 350 ppm) . Otherwise, when silver nanoparticles having a particle size of 21 to 80 nm are used, the amount of the sliver nanoparticles used is 0.006 wt% to 0.01 wt% (60 ppm to 100 ppm) and the amount of the zinc nanoparticles used is 0.035 wt% to 0.045 wt% (350 ppm to 450 ppm).
Moreover, when silver nanoparticles having a particle size of 81 to 100 nm are used, the amount of the sliver nanoparticles used is 0.01 wt% to 0.025 wt% (100 ppm to 250 ppm) and the amount of the zinc nanoparticles used is 0.045 wt% to 0.07 wt% (450 ppm to 700 ppm).
In the case where the silver (Ag) nanoparticles and the selenium (Se) nanoparticles are used together, when silver nanoparticles having a particle size of 1 to 20 nm are used, the amount of the sliver nanoparticles used is 0.0005 wt% to 0.006 wt% (5 ppm to 60 ppm) and the amount of the selenium nanoparticles used is 0.0025 wt% to 0.0035 wt% (25 ppm to 35 ppm) .
Otherwise, when silver nanoparticles having a particle size of 21 to 80 nm are used, the amount of the sliver nanoparticles used is 0.006 wt% to 0.01 wt% (60 ppm to 100 ppm) and the amount of the selenium nanoparticles used is 0.0035 wt% to 0.005 wt% (35 ppm to 50 ppm).
Moreover, when silver nanoparticles having a particle size of 81 to 100 nm are used, the amount of the sliver nanoparticles used is 0.01 wt% to 0.025 wt% (100 ppm to 250 ppm) and the amount of the selenium nanoparticles used is 0.005 wt% to 0.007 wt% (50 ppm to 70 ppm) .
Meanwhile, in the case where the silver (Ag) nanoparticles and the titanium oxide (TiO 2 ) nanoparticles are used together, when silver nanoparticles having a particle size of 1 to 20 ran are used, the amount of the sliver nanoparticles used is 0.0005 wt% to 0.006 wt% (5 ppm to 60 ppm) and the amount of the titanium oxide nanoparticles used is 0.015 wt% to 0.025 wt% (150 ppm to 250 ppm) .
Otherwise, when silver nanoparticles having a particle size of 21 to 80 ran are used, the amount of the sliver nanoparticles used is 0.006 wt% to 0.01 wt% (60 ppm to 100 ppm) and the amount of the titanium oxide nanoparticles used is 0.025 wt% to 0.045 wt% (250 ppm to 450 ppm) .
Moreover, when silver nanoparticles having a particle size of 81 to 100 ran are used, the amount of the sliver nanoparticles used is 0.01 wt% to 0.025 wt% (100 ppm to 250 ppm) and the amount of the titanium oxide nanoparticles used is 0.045 wt% to 0.08 wt% (450 ppm to 800 ppm). [Table 2]
Ratios of silver, zinc, selenium, and titanium oxide nanoparticles mixed with final product when silver nanoparticles are used with other metal nanoparticles
5. Processes of manufacturing artificial nails using the above-described metal nanoparticles and a plastic raw material for artificial nails are as follows. a. As a first step, a process of coating the above metal nanoparticles on the surface of a plastic material is performed as follows.
First, the concentration of metal nanoparticles to be coated is determined. Then, the metal nanoparticles and the plastic material are supplied to a coating apparatus. At this time, colloidal metal nanoparticles are used and, when metal powders are used, oil is mixed with the metal powders, thus coating the nanoparticles on the surface of the plastic material.
Here, according to the present invention, in the case where the silver (Ag) nanoparticles are used solely in a master batch process, or in the case where the silver nanoparticles are used together with the zinc, selenium, or titanium oxide nanoparticles, the concentrations of the metal nanoparticles coated on the surface of the plastic material are 10 to 20 times the final concentration.
The reason is that the ratio of the master batch chip to be finally used is 5 to 10 wt% and thus the metal nanoparticles at high concentration should be used. Of course, in the case of the compounding chip, the concentration of the metal nanoparticles to be finally used is the same as the coating concentration.
The coating process in which the silver nanoparticles are used together with the zinc, selenium, or titanium oxide nanoparticles is performed by separate processes. That is, the two kinds of metal nanoparticles are not coated on the plastic material at the same time, but coated by different coating apparatus .
The coating apparatus is designed such that the surface energy of the metal nanoparticles is not lost while the metal nanoparticles are coated and dried on the surface of the plastic material. The surface with which the metal nanoparticles are in direct contact may be plastic, if possible, or high purity stainless steel (over SUS 304).
Moreover, the coating process is performed by a rotary coating method in which the inside or outside of the coating apparatus rotates, and the rotation speed is 60 to 120 RPM. The reason is that the nanoparticles will not have physical and chemical effects on one another before they dried on the surface of the plastic material.
2. As a second step, a drying process is performed as follows. First, a primary drying process in which the drying process is performed simultaneously with the coating process is carried out in the coating apparatus. The first drying temperature in the coating apparatus is determined considering the properties of the corresponding plastic material and, preferably, 50 to 120 ° C. If a secondary drying process is required according to the kind of plastic material, an additional drying process is performed. The material, the rotation speed, and the drying temperature of the coating apparatus are important factors. In the process in which the coating process and the primary coating process are simultaneously performed, the metal nanoparticles are uniformly dispersed on and adhered to the surface of the plastic material and aggregation between the nanoparticles is minimized.
Here, although the time of the drying process performed at the same time with the coating process varies according to the kind of plastic material and metal nanoparticles, it is preferable that the drying time be 20 to 40 minutes including the coating time until the time point at which the primary drying process, in which moisture is removed to the extent that the metal nanoparticles are not aggregated with each other on the surface of the plastic material, is completed. When the coating apparatus is continuously rotated even after the primary drying process, the metal nanoparticles temporarily adhered to the surface of the plastic material are detached from the surface of the plastic material, thus deteriorating the transparency and antimicrobial activity of the product. c. As a third step, an extrusion process is performed in which the metal nanoparticles after the coating and drying processes are extruded into a master batch chip or compounding chip.
In the case where the metal nanoparticles such as zinc nanoparticles are used together with the silver nanoparticles, the coated and dried plastic materials are mixed with the nanoparticles, dispersed, and extruded by the extrusion process. The reason is that, when the zinc, selenium, or titanium oxide nanoparticles and polymer are mixed with the silver nanoparticles, the silver nanoparticles are coupled with other mixed metal nanoparticles, and thus it is possible to prevent the growth of silver nanoparticles by the coupling effect. d. As a final step, a process Of manufacturing an artificial nail as a final product using the master batch chip or compounding chip is performed.
In the case of the master batch chip, the amount of the master batch chip used is 5 to 10 wt% with respect to the total weight of plastic material, and in the case of the compounding chip, the amount of the compounding chip used is 100 wt%, thus manufacturing an artificial nail.
Next, the test results of the artificial nails manufactured by the method in accordance with Examples of the present invention will be described below.
Example 1
First, the results of the antimicrobial test obtained by mixing the silver (Ag) nanoparticles and the zinc (Zn) nanoparticles in the ratio shown in the following Table 3 are shown in the flowing table 4. As a result, 99.9 % of antimicrobial activity with respect to Staphylococcus aureus exhibited after 24 hours.
[Table 3]
Ratios of silver nanoparticles and zinc nanoparticles
[Table 4]
Results of antimicrobial test
In the above Table 4, the reduction rate (%) was obtained by [ (Ma-Mc) /Mb] x 100, wherein Ma represents the number of viable bacteria in the control sample before culture, Mb represents the number of viable bacteria in the control sample after 24-hour culture, and Mc represents the number of viable bacteria in the test sample after 24-hour culture. ■
Example 2
The results of the antimicrobial test obtained by mixing the silver (Ag) nanoparticles and the selenium (Se) nanoparticles in the ratio shown in the following Table 5 nanoparticles are shown in the flowing table 6. As a result, the nanoparticles had a 99.9 antimicrobial activity with respect to Escherichia coli after 24 hours.
[Table 5]
Ratios of silver nanoparticles and zinc nanoparticles
[Table 6]
Results of antimicrobial test
In the above Table 6, the reduction rate (%) was obtained by [ (Ma-Mc) /Mb] x 100, wherein Ma represents the number of viable bacteria in the control sample before culture, Mb represents the number of viable bacteria in the control sample after 24-hour culture, and Mc represents the number of viable bacteria in the test sample after 24-hour culture.
The invention has been described in detail with reference to preferred embodiments thereof. However, it will be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.