Pretreatment method of nail coating, nail decoration method, and plasma irradiation device

Abstract

To provide a pretreatment method of nail coating, a nail decoration method, and a plasma irradiation device exhibiting an excellent effect by performing appropriate plasma treatment in applying nail coating.SOLUTION: In a pretreatment method of nail coating characterized in that irradiation is performed on a nail with plasma before a step of coating the nail with nail coating liquid. Gas used for generating the plasma is gas of one or more types selected from the group consisting of nitrogen gas, oxygen gas, and carbon dioxide gas.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a nail coating pretreatment method, a nail decoration method, and a plasma irradiation device. [Background technology]

[0002] Nails are often coated with nail polish, gel nails, and other nail art to decorate and protect them. Nail coatings include lacquer (nail polish), acrylic resin, and UV-curing resin. Stones can also be glued to the nail polish, acrylic resin, or UV-curing resin.

[0003] Before applying nail coating, nails are usually sanded to roughen the surface to improve adhesion of lacquer (nail polish), acrylic resin, or energy beam curable resin, or wiped with organic solvents such as acetone to remove dirt and oil. However, sanding the nails can cause whitening and a loss of strength. Furthermore, using organic solvents can lead to percutaneous absorption and discoloration of the nails.

[0004] In order to improve the adhesion of an energy ray-curable nail coating agent to nails, there is a nail surface treatment device equipped with a plasma generation source that pretreats the nail surface with non-thermal plasma (Patent Document 1). However, the plasma generation source described in Patent Document 1 does not specifically describe the type of plasma gas. There is also a method for cosmetic bleaching of nails in which plasma of a gas containing argon as the main component and also containing krypton, hydrogen, or nitrous oxide is directed toward the nails (Patent Document 2). However, Patent Document 2 does not disclose any other plasma gas species than argon-based gas, and the plasma irradiation is performed for the purpose of bleaching the nails, not as a pretreatment step for nail coating. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Special Publication No. 2022-508973 [Patent Document 2] Special Publication No. 2017-510316 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention aims to provide a nail coating pretreatment method, a nail decoration method, and a plasma irradiation device that have the effect of achieving excellent adhesion to the nail coating by performing appropriate plasma treatment when applying the nail coating. [Means for solving the problem]

[0007] The present inventors have found that the above problems can be solved when the gases used to generate plasma are nitrogen gas, oxygen gas, and carbon dioxide gas, and have arrived at the present invention.

[0008] That is, the present invention includes the following [1] to

[10] . [1] A method for pre-treatment of nail coating, characterized in that plasma is irradiated onto nails or the applied nail coating solution before or during the process of applying a nail coating solution to the nails, A method for pretreating nail coating, wherein the gas used to generate the plasma is one or more gases selected from the group consisting of nitrogen gas, oxygen gas, and carbon dioxide gas. [2] The method for pre-treating nail coating according to [1], wherein the plasma is atmospheric pressure plasma. [3] A step of irradiating the nail with plasma; applying a curable nail coating liquid to the nails; The process of hardening the curable nail coating liquid Equipped with The gas used to generate the plasma is one or more gases selected from the group consisting of nitrogen gas, oxygen gas, and carbon dioxide gas. A method for decorating nails. [4] A nail decoration method according to [3] that does not include the step of polishing the nails. [5] A method for decorating nails, comprising the steps of irradiating a stone with plasma, applying a curable nail coating liquid to the nail, placing the plasma-irradiated stone on the curable nail coating liquid applied to the nail, and curing the curable nail coating liquid, wherein the gas used to generate the plasma is one or more gases selected from the group consisting of nitrogen gas, oxygen gas, and carbon dioxide gas. [6] The method for decorating nails according to [3] or [5], further comprising a step of irradiating the curable nail coating liquid applied to the nail with plasma before or after curing. [7] A plasma irradiation device comprising a plasma generating unit and a gas supply unit, wherein the plasma generating unit is porous and plasma is emitted from each of the holes. [8] The plasma irradiation device according to [7], wherein the diameter of the hole is 0.3 to 3.0 mm. [9] The plasma irradiation device according to [7] or [8], wherein the gas supply unit supplies one or more gases selected from the group consisting of nitrogen gas, oxygen gas, and carbon dioxide gas.

[10] The plasma irradiation device according to [7] or [8], which is a plasma irradiation device for irradiating plasma onto at least one of the nail, the stone, and the coating liquid. [Effects of the Invention]

[0009] According to the nail coating pretreatment method, nail decoration method, and plasma irradiation device of the present invention, by performing appropriate plasma treatment, effects such as excellent adhesion to the nail coating can be achieved. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a configuration diagram of a plasma irradiation device according to an embodiment of the present invention. [Figure 2] 2A and 2B are schematic diagrams of a plasma generating section of the plasma irradiation device of FIG. 1, where FIG. 2A is a front view and FIG. 2B is a view taken along the line bb in FIG. 2A. [Figure 3]1 is a graph showing the results of a tensile test in relation to the type of gas. [Figure 4] 1 is a graph showing the results of a tensile test in relation to plasma irradiation time. [Figure 5] 1 is a graph showing the relationship between the type of plasma gas and the water contact angle. [Figure 6] 1 is a graph showing the results of a tensile test in relation to the type of gas. [Figure 7] 1 is a graph showing the results of a tensile test in relation to the type of gas. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the nail coating pretreatment method, the nail decoration method, and the plasma irradiation device will be described in more detail.

[0012] [Nail coating pretreatment method] The nail coating pretreatment method of the present embodiment is a nail coating pretreatment method in which plasma is irradiated onto the nail or the applied nail coating liquid before or during the process of applying the nail coating liquid to the nail, and the gas used to generate the plasma is one or more gases selected from the group consisting of nitrogen gas, oxygen gas, and carbon dioxide gas.

[0013] Plasma irradiation is performed as a pretreatment before applying a nail coating liquid. The term "nail coating liquid" as used herein refers to a liquid applied to human fingernails or toenails, specifically including base coat liquids, lacquer liquids known as manicures, and top coat liquids. Nail coating liquids include not only decorative liquids but also liquids for protecting and strengthening nails for sports, the elderly, and instrument players. The material for the nail coating is not particularly limited, and examples include resins such as acrylic resin, urethane resin, and nitrocellulose resin. Furthermore, nail coatings can be cured by known methods, such as drying or UV or other energy rays.

[0014] Plasma irradiation is performed using a plasma irradiation device on nails before the application of a base coat liquid. Plasma irradiation can also be performed on base coats that have been applied to nails and then dried. Furthermore, plasma irradiation can also be performed on nail polish that has been applied to nails and then dried. It is preferable to use a plasma irradiation device that operates on the principle of non-thermal equilibrium plasma, also known as low-temperature plasma or atmospheric pressure plasma. In such a plasma irradiation device, a voltage is applied to a gas continuously supplied into the device to generate plasma.

[0015] The gas supplied to this plasma irradiation device to generate plasma is one selected from the group consisting of nitrogen gas, oxygen gas, and carbon dioxide gas. These gases may be used alone, or a mixture of multiple gases may be used. For example, a pseudo-air gas containing approximately 78% nitrogen gas, approximately 21% oxygen gas, and the remainder carbon dioxide gas and / or impurity gases may be used. Air may also be used. Furthermore, a gas containing one selected from the group consisting of nitrogen gas, oxygen gas, and carbon dioxide gas and water vapor may be used.

[0016] By irradiating the plasma using one gas selected from the group consisting of nitrogen gas, oxygen gas, and carbon dioxide gas, the following effects, such as improved adhesive strength with nail coating, can be expected. (improved adhesion) By performing pretreatment for plasma irradiation using the above-described gas, the adhesiveness of the nail coating liquid applied to the nails after plasma irradiation is improved. Therefore, polishing the nails before applying the nail coating liquid, which has traditionally been done to improve adhesiveness, is no longer necessary. This avoids a reduction in nail thickness due to polishing, suppressing the whitening of the nail's appearance and a decrease in strength. Nail thickness affects the moisture content of the nail, and thinner nails are more susceptible to cracking. However, according to this embodiment, polishing before applying the nail coating liquid is unnecessary, thereby suppressing nail cracking and contributing to maintaining healthy nails. Since the moisture content of nails tends to decrease in older people, avoiding polishing as much as possible is particularly beneficial for older people. Furthermore, the improved adhesiveness of the nail coating liquid reduces the number of times it needs to be reapplied. The reason why plasma irradiation improves adhesiveness is thought to be because adhesive functional groups are generated on the plasma-irradiated nail surface. In addition, by irradiating the base coat applied to the nail with plasma during the application process of the entire coating liquid including the base coat, nail polish, and top coat, it is expected that the adhesion of the nail polish to the base coat will be improved. Furthermore, by irradiating the nail polish applied to the nail with plasma, it is expected that the adhesion of the top coat to the nail polish will be improved.

[0017] (Prevents nail cracks) By performing pretreatment with plasma irradiation using the above-mentioned gas, it is not necessary to polish the nails before applying the nail coating liquid, as described above, and therefore the nails do not become thin, thereby preventing cracks.In addition, nail coating liquid for protecting and strengthening nails for sports, the elderly, instrument players, etc. can be applied thinly and evenly per coat, preventing the occurrence of nail cracks.Furthermore, when applying multiple coats, plasma irradiation of the surface of the lower layer is expected to improve the adhesion between the coating liquid layers, making it easy to strengthen the nails and preventing cracks and scratches.

[0018] (No degreasing process required) By performing pretreatment with plasma irradiation using the above-mentioned gas, the nail surface can be cleaned by the dry cleaning effect. Therefore, the degreasing treatment of wiping the nail surface with nail polish remover or organic solvents such as acetone, which has traditionally been performed to improve adhesion, is no longer necessary. This reduces the percutaneous absorption of organic solvents and prevents discoloration of the nail.

[0019] (Improved wettability) By performing pretreatment with plasma irradiation using the above-mentioned gas, the wettability of the nail surface can be improved. Therefore, uneven application of the nail coating liquid can be reduced. In addition, a cosmetic serum may be applied to the nail surface before applying the nail coating liquid, and by performing pretreatment with plasma irradiation using the above-mentioned gas, uneven application of the cosmetic serum can be reduced. Therefore, the cosmetic serum or nail coating liquid can be applied evenly. Therefore, the time required for nail coating, such as nail art, can be shortened. The reason why plasma irradiation improves wettability is thought to be because the surface free energy of the plasma-irradiated nail surface increases.

[0020] (disinfection, cleaning) Pretreatment with plasma irradiation using the gas described above can eliminate bacteria adhering to the nail surface. Furthermore, pretreatment with plasma irradiation can decompose and remove dirt such as oils, grease, and bacteria from the nails and fingertips. This can be expected to prevent bacterial infection and inhibit the occurrence of green nails. Furthermore, nail coating can be performed under hygienic conditions. Furthermore, dry cleaning, which does not use surfactants or organic solvents, places less strain on the body than cleaning using surfactants or organic solvents.

[0021] (Serum penetration) A cosmetic serum may be applied to the nail surface before applying or after removing a nail coating liquid. By performing the above-described gas-based plasma irradiation pretreatment before applying the cosmetic serum, penetration of the cosmetic serum into the nail plate, lateral nail fold, nail groove, etc. can be promoted. By promoting penetration of the cosmetic serum through plasma irradiation, the moisture content of the nail and skin is improved. In other words, the moisturizing effect of the cosmetic serum is improved. Cracking and cracking of the nail and skin around the nail may be caused in part by a decrease in the moisture content of the nail and skin. In other words, plasma irradiation is expected to alleviate or prevent cracking and cracking of the nail and skin around the nail. Furthermore, improving the moisturizing effect of the cosmetic serum is expected to promote the function of the nail matrix, which is the source of healthy nails. Furthermore, whether the nail coating liquid is applied after applying a beauty serum or the nail coating liquid is applied without applying a beauty serum, the effects of the beauty serum and nail coating liquid can be enhanced and nail care can be supported by performing a pretreatment of plasma irradiation using the above-mentioned gas in advance. The above-mentioned effects work synergistically to reduce the time required for nail coating treatment, and to enable the application of a highly adhesive nail coating solution that is hygienic and good for the health of the nails. Furthermore, the aforementioned improved adhesiveness, prevention of nail cracking, elimination of the need for degreasing treatment, improved wettability, and the penetration of sterilization and beauty serums allow healthy nails to be cultivated. This provides useful value to people who require nail care. For example, for athletes, specifically baseball pitchers, cracked nails affect their play, and poor nail quality can lead to injuries. Therefore, by cultivating healthy nails, injuries that affect play, such as cracked nails, can be reduced.

[0022] [How to decorate your nails] Next, an embodiment of a nail decoration method will be specifically described. The nail decoration method of this embodiment includes the steps of irradiating plasma onto the nail, applying a curable nail coating liquid to the nail, and curing the curable nail coating liquid, and the gas used to generate the plasma is one or more gases selected from the group consisting of nitrogen gas, oxygen gas, and carbon dioxide gas.

[0023] The term "curable nail coating liquid" as used herein refers to a coating liquid that is applied to the nails of human fingers or toes and that is cured after application or by polymerization. Examples of such curable nail coating liquids include energy ray-curable resins that are cured by irradiation with energy rays, such as photocurable resins, especially ultraviolet-curable (UV-curable) resins, which are known as gel nails. Curable nail coating liquids also include acrylic resins, urethane resins, and nitrocellulose resins, which are used for artificial nails and sculptures.

[0024] Prior to the step of applying the curable nail coating liquid to the nails, a step of irradiating the nails with plasma is performed. The curable nail coating liquid applied to the nails before or after curing can also be irradiated with plasma. The plasma irradiation device used to irradiate the plasma is preferably an irradiation device based on the principle of non-thermal equilibrium plasma, known as low-temperature plasma or atmospheric pressure plasma. In such a plasma irradiation device, a voltage is applied to a gas continuously supplied into the device to generate plasma.

[0025] The gas supplied to this plasma irradiation device to generate plasma is one selected from the group consisting of nitrogen gas, oxygen gas, and carbon dioxide gas. These gases may be used alone or in combination. For example, a pseudo-air gas containing approximately 78% nitrogen gas, approximately 21% oxygen gas, and the remainder carbon dioxide gas and / or impurity gases may be used. Air may also be used.

[0026] Plasma irradiation using one gas selected from the group consisting of nitrogen gas, oxygen gas, and carbon dioxide gas has the following effects. (improved adhesion) By performing a plasma irradiation treatment using the above-described gas, the adhesiveness of the curable nail coating liquid applied to nails after plasma irradiation is improved. Therefore, polishing the nails before applying the curable nail coating liquid, which has traditionally been done to improve adhesiveness, is no longer necessary. This avoids a reduction in nail thickness due to polishing, thereby suppressing whitening of the nail's appearance and a decrease in strength. Nail thickness affects the moisture content of nails, and thinner nails are more susceptible to cracking. However, according to this embodiment, polishing before applying the curable nail coating liquid is unnecessary, thereby suppressing nail cracking and contributing to maintaining healthy nails. Since the moisture content of nails tends to decrease in older people, avoiding polishing is particularly beneficial for older people. Furthermore, the improved adhesiveness of the nail coating liquid reduces the number of times it needs to be reapplied. The reason why plasma irradiation improves adhesiveness is thought to be because adhesive functional groups are generated on the plasma-irradiated nail surface. Furthermore, by irradiating plasma to the curable nail coating liquid applied to nails before or after curing, it is expected that the adhesion of the topcoat curable nail coating liquid to the base curable nail coating liquid will be improved when decorating nails by repeatedly applying and curing the curable nail coating liquid.

[0027] (No degreasing process required) By irradiating the nail with plasma using the gas described above, the nail surface can be cleaned by dry cleaning. This eliminates the need for degreasing, which has traditionally been done to improve adhesion by wiping the nail surface with nail polish remover or organic solvents such as acetone. This reduces the percutaneous absorption of organic solvents and prevents discoloration of the nail.

[0028] (Improved wettability) By performing a plasma irradiation treatment using the above-mentioned gas, the wettability of the nail surface can be improved. Therefore, uneven application of the curable nail coating liquid can be reduced. Furthermore, a cosmetic serum may be applied to the nail surface before applying the nail coating liquid, and by performing a plasma irradiation treatment using the above-mentioned gas, uneven application of the cosmetic serum can be reduced. Therefore, the cosmetic serum and nail coating liquid can be applied evenly. Therefore, the nail coating treatment time can be shortened. The reason why plasma irradiation improves wettability is thought to be because the surface free energy of the plasma-irradiated nail surface increases.

[0029] (Prevents nail cracks) By performing plasma irradiation treatment using the above-mentioned gas, it is not necessary to polish the nails before applying the nail coating liquid, as described above, and therefore the nails do not become thin, thereby preventing cracks. In addition, the nail coating liquid can be applied thinly and evenly per coat, preventing the occurrence of cracks on the nails. Furthermore, when applying multiple coats, irradiating the surface of the lower layer with plasma is expected to improve adhesion between the coating liquid layers, thereby strengthening the nails and preventing cracks and scratches on the nails.

[0030] (disinfection, cleaning) Plasma irradiation using the gas described above can eliminate bacteria adhering to the nail surface. Furthermore, plasma irradiation can decompose and remove dirt such as oils, grease, and bacteria from the nails and fingertips. This can be expected to prevent bacterial infection and inhibit the occurrence of green nails. Furthermore, nail coating can be performed under hygienic conditions. Furthermore, dry cleaning, which does not use surfactants or organic solvents, places less strain on the body than cleaning using surfactants or organic solvents.

[0031] (Serum penetration) A cosmetic serum may be applied to the surface of the nail before applying or after removing a nail coating liquid. By performing plasma irradiation treatment using the above-mentioned gas before applying the cosmetic serum, penetration of the cosmetic serum into the nail plate, lateral nail fold, nail groove, etc. can be promoted. By promoting penetration of the cosmetic serum through plasma irradiation, the moisture content of the nail and skin is improved. In other words, the moisturizing effect of the cosmetic serum is improved. Cracking and fissures in the nails and skin around the nails may be caused in part by a decrease in the moisture content of the nails and skin. In other words, plasma irradiation is expected to alleviate or prevent cracking and fissures in the nails and skin around the nails. Furthermore, improving the moisturizing effect of the cosmetic serum is expected to promote the function of the nail matrix, which is the source of healthy nails. Furthermore, whether the nail coating liquid is applied after applying a beauty serum or the nail coating liquid is applied without applying a beauty serum, the effects of the beauty serum and nail coating liquid can be enhanced and nail care can be supported by performing plasma irradiation treatment using the above-mentioned gas in advance. The above-mentioned effects work synergistically to reduce the time required for nail coating treatment, and make it possible to apply a highly adhesive curable nail coating liquid that is hygienic, good for the health of the nails, and excellent for the nails. Furthermore, the aforementioned improved adhesiveness, prevention of nail cracking, elimination of the need for degreasing treatment, improved wettability, and the penetration of sterilization and beauty serums allow healthy nails to be cultivated. This provides useful value to people who require nail care. For example, for athletes, specifically baseball pitchers, cracked nails affect their play, and poor nail quality can lead to injuries. Therefore, by cultivating healthy nails, injuries that affect play, such as cracked nails, can be reduced.

[0032] Next, another embodiment of the nail decoration method will be specifically described. The nail decoration method of this embodiment includes the steps of irradiating a stone with plasma, applying a curable nail coating liquid to the nail, placing the plasma-irradiated metal part of the stone on the curable nail coating liquid applied to the nail, and curing the curable nail coating liquid, wherein the gas used to generate the plasma is one or more gases selected from the group consisting of nitrogen gas, oxygen gas, and carbon dioxide gas.

[0033] The term "curable nail coating liquid" as used herein refers to a coating liquid that is applied to the nails of human fingers or toes and that is cured after application or cured by polymerization. Examples of such curable nail coating liquids include energy ray-curable resins that are cured by irradiation with energy rays, such as photocurable resins, especially ultraviolet-curable (UV-curable) resins, which are known as gel nails. Curable nail coating liquids also include acrylic resins, urethane resins, and nitrocellulose resins, which are used for artificial nails and sculptures.

[0034] Prior to the step of applying the curable nail coating liquid to the nail, a step of irradiating the stone with plasma is performed. In the previously described embodiment, the nail to which the curable nail coating liquid is applied is irradiated with plasma, whereas in this embodiment, the stone to be adhered to the curable nail coating liquid is irradiated with plasma. The nail and the stone are the same object to be adhered to the curable nail coating liquid.

[0035] Rhinestones with metal vapor deposition are preferred, but stones without metal vapor deposition are also acceptable. Stones include decorative chips and beads similar to stones. Plasma is irradiated onto the portion of the stone that will be adhered to the curable nail coating liquid. For example, in the case of rhinestones, plasma is irradiated onto the vapor-deposited metal portion. Plasma can also be irradiated onto the curable nail coating liquid that has been applied to the nail before or after curing.

[0036] It is preferable to use a plasma irradiation device that uses a non-thermal equilibrium plasma, known as low-temperature plasma or atmospheric pressure plasma, as the principle of the plasma irradiation device. In such a plasma irradiation device, a voltage is applied to a gas continuously supplied into the device to generate plasma.

[0037] The gas supplied to this plasma irradiation device to generate plasma is one selected from the group consisting of nitrogen gas, oxygen gas, and carbon dioxide gas. These gases may be used alone or in combination. For example, a pseudo-air gas containing approximately 78% nitrogen gas, approximately 21% oxygen gas, and the remainder carbon dioxide gas and / or impurity gases may be used. Air gas may also be used.

[0038] Plasma irradiation using the gases described above creates adhesive functional groups such as hydroxyl and carboxyl groups on the stone surface, improving the stone's adhesiveness. Plasma irradiation also cleans the stone's surface through a dry cleaning effect. This eliminates the need for degreasing, which is the traditional method of wiping the stone with an organic solvent such as acetone to improve adhesiveness, simplifying the nail coating process. By irradiating plasma to the curable nail coating liquid applied to nails before or after curing, it is expected that the adhesion of stones to the curable nail coating liquid will be improved, and it is also expected that the adhesion of a top coat of curable nail coating liquid to a base coat of curable nail coating liquid will be improved when decorating nails by repeatedly applying and curing the curable nail coating liquid.

[0039] [Plasma irradiation device] The plasma irradiation device of this embodiment is a device for irradiating plasma onto nails or stones, suitable for the above-mentioned nail coating pretreatment method and nail decoration method, and includes a plasma generating unit and a gas supply unit, the plasma generating unit is porous, and plasma is emitted from each of the holes. Among these, a plasma irradiation device that can locally irradiate plasma onto a human fingernail or a device that can simultaneously irradiate plasma onto each of the nails of one hand or one toe is preferred.

[0040] FIG. 1 shows a schematic diagram of a plasma irradiation device according to this embodiment. The plasma irradiation device 1 shown in FIG. 1 is an irradiation device based on non-thermal equilibrium plasma, also known as low-temperature plasma or atmospheric pressure plasma. It includes a plasma generation unit 2, which emits plasma. The plasma generation unit 2 may have, for example, a nozzle shape, and emits plasma locally from one end of the nozzle. It also includes a gas supply unit, which supplies gas to the plasma generation unit 2, containing a gas cylinder 3 containing one or more gases. The gas cylinder 3 and the plasma generation unit 2 are connected by a gas flow path, and a gas flow meter 4 is provided in the gas flow path. The gas flow rate is measured by the gas flow meter 4, and the gas flow rate is appropriately adjusted by manual or automatic control. The illustrated gas flow meter 4 includes a means for controlling such gas flow rate.

[0041] The gas supplied to the plasma irradiation device 1 to generate plasma is preferably one selected from the group consisting of nitrogen gas, oxygen gas, and carbon dioxide gas. These gases may be used alone or in combination. For example, a pseudo-air gas containing approximately 78% nitrogen gas, approximately 21% oxygen gas, and the remainder carbon dioxide gas and / or impurity gases may be used. Air gas may also be used.

[0042] To generate plasma, electrodes are provided inside the plasma generating unit 2, and atmospheric pressure plasma is generated by supplying appropriate power to the gas introduced into the plasma generating unit 2. A known structure can be used for generating atmospheric pressure plasma. A plasma generating power supply 5 is provided, which is connected to the electrodes of the plasma generating unit 2 to supply power. To generate plasma appropriately, a control unit 6 is connected to the plasma generating power supply 5. This control unit 6 controls the power conditions of the plasma generating power supply 5. Note that the control unit 6 shown in FIG. 1 controls the power conditions. In another embodiment, the control unit 6 can be configured to control both the power conditions and the gas flow rate, and the control unit 6 can be connected to the plasma generating power supply 5 and a gas flow meter 4 to control the gas flow rate.

[0043] FIG. 2 shows a schematic diagram of the plasma generating unit 2. As shown in FIG. 2(a), the plasma generating unit 2 has a generally cylindrical nozzle shape. One end of the cylindrical nozzle has a gas connection 21 for receiving a gas supply, and the other end has an irradiation hole 22 for emitting plasma. A terminal 23 for receiving power from a plasma generation power supply 5 is provided between the gas connection 21 and the irradiation hole 22. FIG. 2(b) shows a view from the direction of the arrow bb in FIG. 2(a). As can be seen from FIG. 2(b), multiple irradiation holes 22 are formed on one end surface of the nozzle, and plasma is emitted from each hole. In the illustrated example, the irradiation holes 22 are radially arranged from the center of the circular end surface, but this is not limiting and they may be arranged concentrically. The diameter of the irradiation holes 22 varies depending on the number of irradiation holes 22 formed on the end surface, but is preferably approximately 0.3 to 3.0 mm, more preferably approximately 0.5 to 1.5 mm. If it is smaller than about 0.3 mm, the irradiation effect is small, and if it is larger than about 3.0 mm, the improvement in the plasma irradiation effect is small and the amount of gas and electricity consumed is increased. [Example]

[0044] The effects of the present invention are demonstrated by the following experiment. (Experiment 1) A comparison of adhesive strength with and without plasma irradiation was carried out in accordance with the peel adhesive strength test (JIS K6854-3) as follows. Several L-shaped test pieces made of acrylic resin plates were prepared. The long straight part constituting the L shape was 60 mm long, the short straight part was 10 mm long, and the thickness was 1 mm. Two test pieces were taken out, and the short straight part (area 10 mm) of each test piece was measured. 2 The plasma irradiation equipment used was a jet-type plasma device manufactured by Plasma Concept Tokyo Co., Ltd. The plasma irradiation conditions were a distance of 3 mm from the nozzle to the test piece, a treatment time of 10 to 60 seconds, and a gas flow rate of approximately 7 L / min. A UV-curable urethane resin (product name: Pregel Peelable Base) was applied to the short, straight sections of the two test pieces (adhesion area 10 mm). 2The short straight sections of each test piece were then butted together and irradiated with ultraviolet light from a DC 165W ultra-high pressure mercury lamp (wavelength 365nm) at an irradiation distance of approximately 30mm. The irradiation conditions were 950mW / cm 2 , irradiation time was 4 minutes. After UV irradiation, a peel strength test was conducted to measure the force required to peel the UV-curable urethane resin, which was taken as the adhesive strength. Measurements were performed using an ORIENTEC RTE-1210 made by Orientec Co., Ltd. at a test speed of 300 mm / min. Such experiments were carried out using nitrogen, carbon dioxide, air, and oxygen as the gas species used to generate the plasma. For comparison, an example was also prepared in which UV-curable urethane resin was applied and cured without plasma irradiation.

[0045] The results of the peel adhesive strength test are shown in Figure 3 as a graph showing the relationship with the gas type. When no plasma irradiation was performed, i.e., in the blank test (Figure 3B), the adhesive strength was 0.503 kgf. In contrast, when plasma irradiation was performed using nitrogen gas for 30 seconds, the adhesive strength was 0.904 kgf. Therefore, the adhesive strength was improved by 44% compared to the blank test. When plasma irradiation was performed using carbon dioxide gas for 60 seconds, the adhesive strength was 0.888 kgf. Therefore, the adhesive strength was improved by 43% compared to the blank test. When plasma irradiation was performed using air for 10 seconds, the adhesive strength was 0.631 kgf. Therefore, the adhesive strength was improved by 20% compared to the blank test. When plasma irradiation was performed using oxygen gas for 10 seconds, the adhesive strength was 0.611 kgf. Therefore, the adhesive strength was improved by 18% compared to the blank test. From the relationship of adhesive strength between the acrylic resin plate and the gel nail, it can be inferred that the relationship of adhesive strength between the nail and the gel nail will also be improved by plasma irradiation.

[0046] (Experiment 2) Plasma treatment was administered to the nail plates of the subjects, and the retention period from application of the gel nail to its removal was examined. The results are shown in Tables 1 and 2.

[0047] [Table 1]

[0048] [Table 2]

[0049] In conventional cases without plasma treatment, the retention period from gel nail application to removal was approximately two weeks. In this experiment, plasma irradiation treatment using carbon dioxide gas extended the retention period to 30-90 days, and the retention period was also extended when nitrogen gas was used.

[0050] (Experiment 3) The surface cleaning effect with and without plasma irradiation was compared by attaching artificial soiling. Several L-shaped test pieces made of acrylic resin plates were prepared. The long straight part constituting the L shape was 60 mm, the short straight part was 10 mm, and the thickness was 1 mm. Two test pieces were taken out, and the short straight part (area 10 mm) of each test piece was measured. 2 ) was coated with liquid paraffin emulsion as simulated soiling. The area coated with the simulated soiling was then irradiated with plasma. The plasma irradiation device used was a jet-type plasma device manufactured by Plasma Concept Tokyo Co., Ltd. The plasma irradiation conditions were a distance of 3 mm from the nozzle to the test piece, a treatment time of 5 to 60 seconds, gas type (nitrogen, carbon dioxide, air, oxygen), and a gas flow rate of approximately 7 L / min. As in Experiment 1, a UV-curable urethane resin (product name: Prigel Peelable Base) was applied to the short, straight sections of the two test pieces (adhesion area 10 mm). 2 The short straight sections of each test piece were then butted together and irradiated with ultraviolet light from a DC 165W ultra-high pressure mercury lamp (wavelength 365nm) at an irradiation distance of approximately 30mm. The irradiation conditions were 950mW / cm 2 , irradiation time was 4 minutes.

[0051] After UV irradiation, a peel strength test was conducted to measure the force required to peel the UV-curable urethane resin, which was taken as the adhesive strength. Measurements were performed using an ORIENTEC RTE-1210 made by Orientec Co., Ltd. at a test speed of 300 mm / min. This experiment was repeated several times, varying the plasma irradiation time. For comparison, a UV-curable urethane resin was applied and cured over the simulated soil without plasma irradiation.

[0052] The results of the peel adhesion strength test are shown in Figure 4 as a graph of the relationship with plasma exposure time. Without plasma irradiation, the adhesive strength was 0.35 kgf. In contrast, with 30 seconds of plasma irradiation, the adhesive strength was 0.63 kgf, and with 60 seconds of plasma irradiation, the adhesive strength was 0.74 kgf. Therefore, with plasma irradiation, the irradiated surface was dry cleaned by the plasma irradiation, resulting in a significant improvement in adhesive strength. From the results of surface cleaning of the acrylic resin plate, it can be inferred that surface cleaning of the nail can be similarly achieved.

[0053] (Experiment 4) The water contact angle of the surface with and without plasma irradiation was compared by attaching artificial soiling. After applying a liquid paraffin emulsion to the surface of an acrylic resin plate as a simulated soil, a water droplet (4 μL of distilled water) was dropped on the plate and the water contact angle was measured using a portable contact angle meter PG-X+. This was used as a blank test. Next, a liquid paraffin emulsion was applied to the surface of the acrylic resin plate as a simulated soil, and the plate was then irradiated with plasma using a jet-type plasma device manufactured by Plasma Concept Tokyo Co., Ltd., with a nozzle-to-test specimen distance of 3 mm, a treatment time of 60 seconds, and gas types (nitrogen, carbon dioxide, air, oxygen) at a gas flow rate of approximately 7 L / min. A water droplet (4 μL of distilled water) was then dropped on the plate and the water contact angle was measured using a portable contact angle meter PG-X+. Such an experiment was carried out three times for each of the gases used to generate plasma: nitrogen, carbon dioxide, air, and oxygen, and the average values ​​were calculated.

[0054] The results are shown in a graph of the relationship between gas type and water contact angle in Figure 5. As can be seen from Figure 5, in the blank test where no plasma irradiation was performed, the water contact angle was 72°, whereas in the case of nitrogen gas plasma irradiation the water contact angle was 53°, in the case of oxygen gas plasma irradiation the water contact angle was 1°, in the case of air plasma irradiation the water contact angle was 41°, and in the case of carbon dioxide gas plasma irradiation the water contact angle was 24°. From the results of the water contact angle of the acrylic resin plate, it can be inferred that the water contact angle of the nail will also decrease in the same way.

[0055] (Experiment 5) The bactericidal effect on nails with or without plasma irradiation was investigated as follows. Plasma was irradiated onto the surface of one of the multiple nails on one hand using a jet-type plasma device manufactured by Plasma Concept Tokyo Co., Ltd., with a distance of 3 mm from the nozzle to the nail, a treatment time of 30 seconds, gas type (oxygen), and a gas flow rate of approximately 7 L / min. Plasma-treated and non-plasma-treated nails from one hand were wiped with a sterile cotton swab to collect bacteria. The collected swab was then immersed in saline (0.9%) and stirred to prepare a suspension. 1 g of the diluted sample was dropped onto an agar medium and spread evenly with a spreader. After culturing in an incubator (35°C for 48 hours), the number of colonies was counted. As a result, the number of colonies on the nails without plasma irradiation was 11, while the number of colonies on the nails with plasma irradiation was 1.

[0056] (Experiment 6) The penetration effect of the serum into nails with or without plasma irradiation was investigated as follows. The nails were placed in a sealed container (dessicator) containing silica gel and left to stand for 24 hours. Distilled water was then dripped onto both the plasma-treated and non-plasma-treated nails using a dropper, and the water was wiped off after one minute. The moisture content was then measured using a moisture meter (Hiranuma Trace Moisture Meter AQ-2200) with the vaporizer set at 100°C.

[0057] As a result, the moisture content of the non-plasma treated nails was 20.4%, while the moisture content of the plasma treated nails was 23.7%, meaning that the plasma treated nails had a higher water penetration effect. Based on this penetration effect of distilled water, it can be inferred that beauty serums also have a penetration effect.

[0058] (Experiment 7) A comparison of stone adhesion strength with and without plasma irradiation was carried out in accordance with the tensile shear adhesive strength test for rigid adherends (JIS K6850, 1999) as follows. Several test pieces (size 10 mm x 60 mm, thickness 1 mm) consisting of acrylic resin plates, aluminum plates, and brass plates were prepared. A combination of acrylic resin test pieces and aluminum test pieces, or a combination of acrylic resin test pieces and brass test pieces were prepared, and plasma was irradiated near the short sides of each test piece. The plasma irradiation device used was a jet-type plasma device manufactured by Plasma Concept Tokyo Co., Ltd. The plasma irradiation conditions were a distance of 3 mm from the nozzle to the test piece, a treatment time of 10 to 60 seconds, and a gas flow rate of approximately 7 L / min. A UV-curable urethane resin (product name: Prigel Peelable Base) was applied near the plasma-irradiated short sides of two test pieces, and then the short sides were overlapped (adhesion area 10 mm). 2 ) and ultraviolet light was irradiated from a DC 165W ultra-high pressure mercury lamp (wavelength 365nm) at an irradiation distance of approximately 30mm. The irradiation conditions were 950mW / cm 2 , irradiation time was 4 minutes.

[0059] After UV irradiation, a tensile shear bond strength test was conducted to measure the force required for two test pieces bonded with UV-curable urethane resin to break under tensile shear, and this was taken as the bond strength. Measurements were performed using an ORIENTEC RTE-1210 made by Orientec Co., Ltd. at a test speed of 300 mm / min. Such experiments were carried out using nitrogen, carbon dioxide, air, and oxygen as the gas species used to generate the plasma. For comparison, an example was also prepared in which UV-curable urethane resin was applied and cured without plasma irradiation.

[0060] The results of the tensile shear bond strength test of the test piece of the acrylic plate and aluminum plate combination are shown in Figure 6 as a graph of the relationship with the gas type. Without plasma irradiation, i.e., in the blank test, the adhesive strength was 22.77 kgf. In contrast, with 60 seconds of plasma irradiation using oxygen gas, the adhesive strength was 25.21 kgf. Therefore, adhesive strength was 10% higher than the blank test. With 60 seconds of plasma irradiation using air, the adhesive strength was 44.41 kgf. Therefore, adhesive strength was 49% higher than the blank test. With 60 seconds of plasma irradiation using nitrogen gas, the adhesive strength was 54.94 kgf. Therefore, adhesive strength was 59% higher than the blank test. With 60 seconds of plasma irradiation using carbon dioxide gas, the adhesive strength was 52.89 kgf. Therefore, adhesive strength was 57% higher than the blank test. With 30 seconds of plasma irradiation using oxygen gas, the adhesive strength was 46.87 kgf. Therefore, adhesive strength was 51% higher than the blank test. With 30 seconds of plasma irradiation using air, the adhesive strength was 47.59 kgf. Therefore, adhesive strength was 52% higher than the blank test. When plasma irradiation was performed using nitrogen gas for 30 seconds, the adhesive strength was 48.37 kgf. Therefore, the adhesive strength was improved by 53% compared to the blank test. When plasma irradiation was performed using carbon dioxide gas for 30 seconds, the adhesive strength was 39.79 kgf. Therefore, the adhesive strength was improved by 43% compared to the blank test.

[0061] The results of the tensile shear bond strength test of the test piece of the acrylic plate and brass plate combination are shown in Figure 7 as a graph in relation to the gas type. Without plasma irradiation, i.e., in the blank test, the adhesive strength was 40.75 kgf. In contrast, with 60 seconds of plasma irradiation using oxygen gas, the adhesive strength was 53.77 kgf. Therefore, adhesive strength was improved by 24% compared to the blank test. With 60 seconds of plasma irradiation using nitrogen gas, the adhesive strength was 53.77 kgf. Therefore, adhesive strength was improved by 24% compared to the blank test. With 60 seconds of plasma irradiation using carbon dioxide gas, the adhesive strength was 54.33 kgf. Therefore, adhesive strength was improved by 25% compared to the blank test. With 30 seconds of plasma irradiation using oxygen gas, the adhesive strength was 45.79 kgf. Therefore, adhesive strength was improved by 11% compared to the blank test. With 30 seconds of plasma irradiation using air, the adhesive strength was 51.94 kgf. Therefore, adhesive strength was improved by 22% compared to the blank test. With 30 seconds of plasma irradiation using nitrogen gas, the adhesive strength was 51.66 kgf. Therefore, adhesive strength was improved by 21% compared to the blank test. When carbon dioxide gas was used for 30 seconds of plasma irradiation, the adhesive strength was 50.33 kgf, which was a 19% improvement over the blank test. Both aluminum and brass are metals or alloys used as the metal parts of rhinestones, and the above test results show that the adhesive strength between gel nails and rhinestones was improved by plasma irradiation treatment.

[0062] (Experiment 8) Comparison of water contact angle, surface free energy and hydrogen bond energy with and without plasma irradiation was carried out using goat skin as a skin simulant in place of human skin. Tanned goatskin, 0.3 mm thick, was cut into rectangular pieces measuring 1 cm x 10 cm to prepare multiple samples. One side of the sample was irradiated with plasma. The plasma irradiation device used for plasma irradiation was a jet-type plasma device manufactured by Plasma Concept Tokyo Co., Ltd. The plasma irradiation conditions were as follows: the distance from the nozzle to the sample was 3 mm, the treatment time was 10 seconds, the gas type was carbon dioxide, and the gas flow rate was approximately 8 L / min. A 1.5 μL drop of water, diiodomethane, and bromonaphthalene was placed on the surface of the plasma-irradiated sample and a control sample that was not exposed to plasma. The contact angles for water, diiodomethane, and bromonaphthalene were measured using a DropMaster 500 contact angle meter. The contact angle measurement time was 1 second. Based on these contact angles, the surface free energy and hydrogen bond energy of the plasma-irradiated sample and the control sample that was not exposed to plasma were calculated. The surface free energy and hydrogen bond energy were calculated using the theoretical formula for surface free energy proposed by Kitazaki and Hata. The measured contact angle of water was 38.4° for the control sample that was not irradiated with plasma, while the contact angle of the plasma-irradiated sample was 0.1°, a decrease of approximately 99%. The surface free energy of the control sample not exposed to plasma was 63.6 mJ / m, while that of the plasma-exposed sample was 76.8 mJ / m. The hydrogen bond energy of the control sample not exposed to plasma was 18.2 mJ / m, while that of the plasma-exposed sample was 28.9 mJ / m. These experimental results showed that plasma treatment made the goat skin surface hydrophilic, increasing the surface free energy by approximately 20% and the hydrogen bond energy by approximately 59%. It can be said that the plasma treatment chemically activated the surface, resulting in hydrophilicity.

[0063] (Experiment 9) Comparison of water contact angle, surface free energy and hydrogen bond energy with and without plasma irradiation was carried out using the mantle membrane of the Japanese flying squid as a simulant nail in place of a human nail. Several samples were prepared by cutting the mantle of dried Japanese flying squid into rectangular pieces measuring 1 cm x 10 cm. One side of the sample was irradiated with plasma. The plasma irradiation device used for plasma irradiation was a jet-type plasma device manufactured by Plasma Concept Tokyo Co., Ltd. The plasma irradiation conditions were as follows: the distance from the nozzle to the sample was 3 mm, the treatment time was 10 seconds, the gas type was carbon dioxide, and the gas flow rate was approximately 8 L / min. On the surface of the plasma-irradiated sample and a control sample that was not plasma-irradiated, 1.5 μL of water, diiodomethane, and bromonaphthalene were dropped, and the contact angles of water, diiodomethane, and bromonaphthalene were measured using a contact angle meter, DropMaster 500. The contact angle measurement time was 1 second. The contact angle of water could not be measured because water penetrated from the surface into the mantle. The contact angle of diiodomethane was 92.3° for the non-plasma-exposed control sample, while it was 51.2° for the plasma-exposed sample. Furthermore, the contact angle of bromonaphthalene was 22.7° for the non-plasma-exposed control sample, while it was 8.1° for the plasma-exposed sample. These experimental results showed that plasma treatment reduced the contact angle of diiodomethane by approximately 45% compared to the control experiment, and the contact angle of bromonaphthalene by approximately 64% compared to the control experiment, indicating that the surface of the Japanese flying squid's mantle was chemically modified. Because both diiodomethane and bromonaphthalene are non-polar solvents, it can be said that plasma treatment improved the wettability of non-polar substances such as oil.

[0064] (Experiment 10) A comparison of the penetration of moisturizing oil with and without plasma irradiation was conducted using goat skin as a simulated skin in place of human skin. Tanned goatskin, 0.3 mm thick, was cut into 3 cm x 3 cm squares and left to stand in a constant temperature and humidity chamber at 25°C and 50% RH for 5 hours to prepare several samples. One side of the sample was irradiated with plasma. The plasma irradiation device used for plasma irradiation was a jet-type plasma device manufactured by Plasma Concept Tokyo Co., Ltd. The plasma irradiation conditions were as follows: nozzle to sample distance 3 mm, treatment time 30 seconds, carbon dioxide gas type, gas flow rate approximately 8 L / min. 0.02g of moisturizing Grown Care Cuticle Care Oil (containing natural vegetable oils and horse oil) was dropped with a dropper onto the surface of the plasma-irradiated sample and a control sample that was not plasma-irradiated. One minute later, an image of the area where the oil was dropped was taken. The image was then processed using image analysis software to binarize the image's shades, and the area into which the oil had penetrated was measured. The measured oil penetration area was 101.1 mm for the control sample that was not irradiated with plasma. 2 The plasma-irradiated sample was 114.7 mm 2 This is an improvement of approximately 13%. In addition, in the control experiment, a sample that was not irradiated with plasma still had oil remaining on the surface of the goatskin one minute after the moisturizing oil was dripped onto it, whereas in the plasma-irradiated sample, the moisturizing oil penetrated into the skin immediately after dripping onto it, and no oil remained on the surface of the goatskin. These experimental results suggest that plasma treatment improved the penetration of moisturizing oil into goat skin as a pseudo-skin.

[0065] (Experiment 11) The moisturizing properties of serums with and without plasma irradiation were compared. The moisture content of the lateral nail fold surface of the index fingernail of one subject was measured using a multi-function skin checker (Peipai Skin Moisture Checker PM-907) from Shenzhen Jiatu Co., Ltd. Plasma irradiation was performed on the measured lateral nail fold and the surrounding lateral nail plate edge of multiple nails using a jet-type plasma device manufactured by Plasma Concept Tokyo Co., Ltd., with a nozzle-to-nail distance of 3 mm, a treatment time of 30 seconds, gas type (carbon dioxide), and a gas flow rate of approximately 7 L / min. Some of the nails on the subjects' hands were not irradiated with plasma. DHC Medicated Mild Lotion (DHC Corporation) was applied as a lotion to the lateral nail fold along the lateral nail plate edge of each of the subjects' plasma-irradiated and non-plasma-irradiated nails, and left to sit for 30 seconds to allow it to absorb into the skin. The moisture content of the surface of the lateral nail fold after applying lotion to the nail of the subject's index finger was measured at three points using the same multi-function skin moisture checker (Peipai Skin Moisture Checker PM-907) as before application. The measurement results showed that the moisture content of the lateral nail fold surface before plasma irradiation and lotion application was 23% on average at three points. The moisture content of the lateral nail fold surface after lotion application without plasma irradiation was 51% on average at three points. The moisture content of the lateral nail fold surface after plasma irradiation and lotion application was 65% on average at three points. From these results, the moisture content of the lateral nail fold surface after plasma irradiation and lotion application was 1.27 times higher (65 divided by 51) than when lotion was applied without plasma irradiation. [Explanation of symbols]

[0066] 1. Plasma irradiation device 2. Plasma generating unit 3 gas cylinders 4 Gas flow meters 5. Plasma generating power source 6. Control Unit 21 Gas connection 22 Irradiation hole 23 terminals

Claims

1. A method for pre-treatment of nail coating, characterized in that a nail or the applied nail coating liquid is irradiated with plasma before or during a process of applying a nail coating liquid to the nail, The gas used to generate the plasma is one or more gases selected from the group consisting of nitrogen gas, oxygen gas, and carbon dioxide gas. How to pre-treat nail coating.

2. 2. The method for pre-treating nail coating according to claim 1, wherein the plasma is atmospheric pressure plasma.

3. irradiating the nail with plasma; applying a curable nail coating liquid to the nails; The process of hardening the curable nail coating liquid Equipped with The gas used to generate the plasma is one or more gases selected from the group consisting of nitrogen gas, oxygen gas, and carbon dioxide gas. A method for decorating nails.

4. 4. The method for decorating nails according to claim 3, which does not include the step of polishing the nails.

5. a step of exposing the stone to plasma; applying a curable nail coating liquid to the nails; placing the plasma-irradiated stone on a curable nail coating solution applied to the nail; The process of hardening the curable nail coating liquid Equipped with The gas used to generate the plasma is one or more gases selected from the group consisting of nitrogen gas, oxygen gas, and carbon dioxide gas. A method for decorating nails.

6. 6. The method for decorating nails according to claim 3, further comprising the step of irradiating the curable nail coating liquid applied to the nail with plasma before or after curing.

7. A plasma generating unit, and Gas Supply Unit Equipped with A plasma irradiation device characterized in that the plasma generating section is porous and plasma is emitted from each of the holes.

8. 8. The plasma irradiation device according to claim 7, wherein the diameter of the holes is 0.3 to 3.0 mm.

9. 9. The plasma irradiation device according to claim 7, wherein the gas supply unit supplies one or more gases selected from the group consisting of nitrogen gas, oxygen gas, and carbon dioxide gas.

10. 9. The plasma irradiation device according to claim 7, which is a plasma irradiation device for irradiating plasma onto at least one of a nail, a stone, and a coating liquid.

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