KR102158446B1 - Method for Manufacturing Nail polish sticker - Google Patents

Abstract

The present invention relates to a method for manufacturing a nail polish sticker, comprising the steps of: a) manufacturing a first coating solution comprising 50 to 70 wt% of nitrocellulose and 30 to 50 wt% of a mixture including 5 to 15 parts by weight of a solvent and an acrylic polymer obtained by polymerization of 5 to 30 parts by weight of hydroxyalkyl methacrylate monomers, 2 to 7 parts by weight of poly(2-dimethylamino)ethyl methacrylate methyl chloride quaternary salt, and 2 to 7 parts by weight of dopamine methacrylamide monomers, based on 100 parts by weight of alkyl methacrylate monomers; b) forming a first nail polish layer by coating the first coating solution on a release sheet; c) heat-treating the first nail polish layer of step b); d) manufacturing a second coating solution comprising 35 to 55 wt% of nitrocellulose, 2 to 10 wt% of a copolymer represented by chemical formula (1), 15 to 25 wt% of a thermoplastic resin gel, and 10 to 30 wt% of a solvent; e) forming a second nail polish layer by coating the second coating solution on the top surface of the heat-treated first nail polish layer of step c); and f) heat-treating the second nail polish layer of step e).

Description

[Method for Manufacturing Nail polish sticker}

The present invention relates to a method of manufacturing a nail polish sticker.

In recent years, as interest in beauty increases, more and more users want to express beauty and personality on their nails by using manicure or the like.

However, there is a disadvantage in that it takes a relatively long time to paint and polish a nail polish and the like, and it is not easy to produce a desired aesthetic.

In order to solve this problem, a sticker-type nail decoration means has been proposed, but the nail decoration means has a disadvantage in that a solvent is applied to the nail and a sticker is attached.

On the other hand, an adhesive layer may be provided on one side of the color layer in which the aesthetic sense is produced. However, when the adhesive layer is provided in this way, in order for the color layer to be naturally attached along the curved surface of the nail, the sticker itself including the adhesive layer and the color layer It is necessary to ensure flexibility.

In order to secure the flexibility, the content of the solvent constituting the color layer, etc. must be above a predetermined level. In this case, various print patterns may be damaged or the color layer itself may be damaged in the process of cutting nail-shaped stickers. It becomes higher. In addition, since a separate sealing means is required to maintain the content of the solvent, manufacturing cost increases, and there is a disadvantage that the product cannot be stored for a long time after opening.

Therefore, there is a growing demand for a nail polish sticker that enables easy adhesion to nails, excellent adhesion, and easy separation. However, it is known that it is not easy to manufacture a manicure sticker having excellent adhesion and easy separation.

Korean Patent Registration No. 10-1207316

It is an object of the present invention to provide a method of manufacturing a nail polish sticker excellent in moisture and heat resistance, heat resistance, adhesion, ease of separation and durability.

In addition, an object of the present invention is to provide a method of manufacturing a nail polish sticker having excellent adhesion to nails and easy separation.

In order to achieve the above object, the present invention

a) 5 to 30 parts by weight of hydroxyalkyl (meth)acrylate monomer, 2 to 7 parts by weight of poly(2-dimethylamino)ethylmethacrylate methylchloride quaternary salt monomer, based on 100 parts by weight of alkylmethacrylate monomer, And 30 to 50% by weight of a mixture comprising an acrylic polymer in which 2 to 7 parts by weight of a dopamine methacrylamide monomer is polymerized and 5 to 15 parts by weight of a solvent; And nitrocellulose 50 to 70% by weight; preparing a first coating solution containing;

b) forming a first nail polish layer by coating the first coating solution on a release sheet;

c) heat-treating the first nail polish layer in step b);

d) To prepare a second coating solution comprising 35 to 55% by weight of nitrocellulose, 2 to 10% by weight of a copolymer represented by the following formula (1), 15 to 25% by weight of a thermoplastic resin gel, and 10 to 30% by weight of a solvent step;

e) coating the second coating solution on the upper surface of the heat-treated first nail polish layer in step c) to form a second nail polish layer; And

f) heat-treating the second nail polish layer of step e);

It provides a method of manufacturing a nail polish sticker comprising:

[Formula 1]

In the above formula

a and b are mole fractions, a is 0.3 to 0.7, b is 0.3 to 0.7, and a+b=1.

The manufacturing method of the nail polish sticker of the present invention provides a nail polish sticker having excellent moisture and heat resistance, heat resistance, adhesion, ease of separation and durability.

In particular, the method of manufacturing a manicure sticker of the present invention provides a manicure sticker having excellent adhesion to nails and easy to separate.

1 to 4 are cross-sectional views illustrating a manicure sticker manufactured by the method of manufacturing a manicure sticker of the present invention.

Hereinafter, the present invention will be described in detail.

The present invention

a) 5 to 30 parts by weight of a hydroxyalkyl (meth)acrylate monomer, 2 to 7 parts by weight of a poly(2-dimethylamino)ethylmethacrylate methylchloride quaternary salt monomer, based on 100 parts by weight of an alkylmethacrylate monomer, and 30 to 50% by weight of a mixture comprising 2 to 7 parts by weight of a dopamine methacrylamide monomer polymerized acrylic polymer and 5 to 15 parts by weight of a solvent; And nitrocellulose 50 to 70% by weight; preparing a first coating solution containing;

b) forming a first nail polish layer by coating the first coating solution on a release sheet;

c) heat-treating the first nail polish layer in step b);

d) To prepare a second coating solution comprising 35 to 55% by weight of nitrocellulose, 2 to 10% by weight of a copolymer represented by the following formula (1), 15 to 25% by weight of a thermoplastic resin gel, and 10 to 30% by weight of a solvent step;

e) coating the second coating solution on the upper surface of the heat-treated first nail polish layer in step c) to form a second nail polish layer; And

f) heat-treating the second nail polish layer of step e);

It relates to a method of manufacturing a nail polish sticker comprising:

[Formula 1]

In the above formula

a and b are mole fractions, a is 0.3 to 0.7, b is 0.3 to 0.7, and a+b=1.

Various types of paper or synthetic resin films may be used as the release sheet coated with the first coating solution.

The first coating solution may be applied to the release sheet in a state in which a release agent is applied to the surface so that the first manicure layer is easily separated from the release sheet.

The acrylic polymer, which is an adhesive component included in the first coating solution, may include an alkyl-methacrylate monomer, and may further include a hydroxyalkyl (meth)acrylate monomer to improve the flexibility of the adhesive.

As the alkyl-methacrylate monomer, a methacrylate having an alkyl group having 1 to 8 carbon atoms may be used. For example, butyl-methacrylate, 2-ethylhexyl-methacrylate, ethyl-methacrylate , Methyl-methacrylate, n-propyl-methacrylate, isopropyl-methacrylate, t-butyl-methacrylate, pentyl-methacrylate, n-octyl-methacrylate, isooctyl-methacrylate And at least one selected from the group consisting of isononyl-methacrylate, and the like.

The hydroxyalkyl (meth)acrylate monomer may be included in an amount of 5 to 30 parts by weight, based on 100 parts by weight of the alkyl methacrylate monomer. If the hydroxyalkyl (meth)acrylate monomer is included in less than 5 parts by weight, the flexibility of the pressure-sensitive adhesive is too low, resulting in insufficient initial adhesion, and if it exceeds 30 parts by weight, the flexibility of the pressure-sensitive adhesive becomes excessive, resulting in lower cohesion and weakened adhesion durability. .

As the hydroxyalkyl (meth)acrylate monomer, 2-hydroxyethyl-meth-acrylate, 2-hydroxypropyl-meth-acrylate, 4-hydroxybutyl-meth-acrylate, 2-hydroxyethylene At least one selected from the group consisting of glycol-meth-acrylate, 2-hydroxypropylene glycol-meth-acrylate, and the like may be used.

The acrylic polymer, which is an adhesive component included in the first coating solution, is 2 to 7 parts by weight of poly(2-dimethylamino)ethylmethacrylate methylchloride quaternary salt monomer and 2 to 7 parts by weight based on 100 parts by weight of the alkyl methacrylate monomer. It may contain a dopamine methacrylamide monomer by weight.

The poly(2-dimethylamino)ethyl methacrylate) methyl chloride quaternary salt monomer is a natural component and has a characteristic of forming strong adhesion to organic and inorganic substances. , In particular, it has the property of maintaining strong bonding force even in water.

The dopamine methacrylamide monomer is a natural component containing a catechol group, is harmless to the human body, and has a characteristic of forming strong adhesion to organic or inorganic substances. In particular, it forms a very strong bond even in water.

Therefore, the above monomers can provide an effect of preventing the adhesive layer, which is one manicure layer, from being easily separated from the nail even if it frequently contacts water.

As a solvent for the first coating solution, at least one selected from acetone, methyl ethyl ketone, toluene and ethyl acetate may be used.

The solvent may be included in an amount of 5 to 15 parts by weight, based on 100 parts by weight of alkyl methacrylate. When the solvent is contained in an amount of less than 5 parts by weight, coating becomes difficult, and when the amount exceeds 15 parts by weight, a problem of lowering adhesion may be caused, which is not preferable.

The acrylic polymer may be polymerized using one or more selected from benzoyl peroxide and azobisisobutyronitrile (AIBN) as initiators.

The initiator may be used in an amount of 0.2 to 10 parts by weight based on 100 parts by weight of alkyl-methacrylate. If it is less than 0.2 parts by weight of the initiator, the yield of the resultant copolymerization is excessively low, and if it exceeds 10 parts by weight, the copolymerization reaction proceeds rapidly and the molecular weight of the resultant copolymerization may be excessively increased.

In the present invention, the acrylic polymer may further include 0.2 to 3 parts by weight of zinc peroxide based on 100 parts by weight of alkyl-methacrylate as a crosslinking agent. The zinc peroxide performs a function of firmly crosslinking each monomer, thereby improving the tensile strength of the pressure-sensitive adhesive.

In one embodiment of the present invention, when preparing the acrylic polymer, a monomer including a crosslinkable functional group may be further included in order to control the glass transition temperature of the nail sticker adhesive or to impart other functions and properties. As the monomer, a vinyl monomer or an acrylic monomer may be used. Specifically, for example, one or two or more selected from acrylonitrile, meth-acrylamide, N-methylacrylamide, styrene, methylstyrene, vinyltoluene, glycidyl-methacrylate, or vinyl acetate Can be used by mixing. The monomer containing the crosslinkable functional group reacts with the crosslinking agent to impart cohesive strength or adhesive strength by chemical bonding so that the destruction of the adhesive cohesive under high temperature or high humidity conditions does not occur.

The acrylic polymer solution (a mixture of acrylic polymer and solvent) as the pressure-sensitive adhesive described above is mixed with nitrocellulose to form a first coating solution.

When the content of the acrylic polymer solution is less than 30% by weight based on the total weight of the first coating solution, adhesion is lowered, and when it exceeds 50% by weight, surface hardness and water resistance adhesion are lowered.

The nitrocellulose performs a function of increasing the surface durability of the nail sticker. When the content of the nitrocellulose is less than 50% by weight based on the total weight of the first coating solution, the surface hardness is excessively lowered, and when it exceeds 70% by weight, the flexibility of the nail sticker is reduced.

The first coating solution may further contain 2 to 10% by weight of a copolymer represented by the following Formula 1:

[Formula 1]

In the above formula

a and b are mole fractions, a is 0.3 to 0.7, b is 0.3 to 0.7, and a+b=1.

The monomer containing the catechol group is a natural component, harmless to the human body, and has a characteristic of forming strong adhesion to organic or inorganic substances. In addition, the poly (2-dimethylamino) ethyl methacrylate) methyl chloride quaternary salt (Poly (2-dimethylamino) ethyl methacrylate) methyl chloride quaternary salt) monomer, as a natural component, forming strong adhesion to organic and inorganic substances Has features.

In addition, the copolymer provides a very strong bonding force even in water. Therefore, the copolymer of Formula 1 can provide an effect of preventing the first manicure layer from falling off easily even if it frequently contacts water.

The copolymer may be a random copolymer, and one having a weight average molecular weight of 50,000 to 2,000,000 may be used, more preferably 80,000 to 200,000.

The first coating solution may further contain a multifunctional crosslinking agent. As the polyfunctional crosslinking agent, a tolyene diisocyanate adduct (TDI-1) of isocyanate-based trimethylolpropane may be used.

The multifunctional crosslinking agent may be included in the range of 0.1% to 20% by weight based on the total weight of the first coating solution. If the content of the multifunctional crosslinking agent is included in less than the above-described range, the adhesion of the first coating solution may be reduced, and if it exceeds 20% by weight, stability is reduced, which is not preferable.

The first coating solution may further contain a silane-based crosslinking agent such as 3-glycidoxypropyltrimethoxy silane. The silane-based crosslinking agent may improve durability and improve adhesion to nails, thermal stability, and the like.

In the method for manufacturing a manicure sticker of the present invention, a heat treatment step may be performed while the first coating solution is applied to the release sheet. The heat treatment may be performed for 1.5 to 2.5 minutes based on a temperature of 40 to 50°C. The first manicure layer is completed by this heat treatment.

In the present invention, the second coating solution contains 35 to 55% by weight of nitrocellulose, 2 to 10% by weight of a copolymer represented by the following formula (1), 15 to 25% by weight of a thermoplastic resin gel, and 10 to 30% by weight of a solvent. I can. In this case, the second coating solution may be prepared by first mixing nitrocellulose and a solvent, and then mixing the mixture and a thermoplastic resin gel.

The thermoplastic resin gel may be a material obtained by mixing and stirring a thermoplastic resin with a plasticizer. As the thermoplastic resin, polyurethane, polyvinyl acetate, ethylene vinyl acetate, polyvinyl chloride resin, and the like may be used. In addition, a non-phthalate plasticizer may be used as the plasticizer. Non-phthalate plasticizers are environment-friendly and human-friendly, and are used together with the above-described thermoplastic resin to improve the efficiency of work requiring flowability, and to improve the flexibility of the second coating solution.

As the non-phthalate plasticizer, at least one selected from dipropylen glycol dibenzoate (DP) and diethylene glycol dibenzoate (DE) may be used. As such a plasticizer is contained in an appropriate amount, the flowability, viscosity, low-temperature adhesion, low-temperature film forming property, and flexibility of the second coating solution may be improved.

The plasticizer may be used in an amount of 1 to 20 parts by weight based on 100 parts by weight of the thermoplastic resin.

The second coating solution may further contain 2 to 10% by weight of a copolymer represented by Formula 2 below in order to enhance the surface strength of the second nail polish layer.

[Formula 2]

In the above formula

a and b are mole fractions, a is 0.3 to 0.7, b is 0.3 to 0.7, and a+b=1.

The copolymer includes a 2-octyl cyanoacrylate monomer, thereby improving the surface strength of the second nail polish layer, thereby providing an effect of preventing the surface from being cracked or broken. In addition, the glycidyldimethyldodecylammonium chloride acrylate monomer allows the components included in the second coating solution to be uniformly dispersed, and provides an effect of improving the bonding strength by forming an ionic bond with the surface of the first nail polish layer.

The copolymer may be a random copolymer, and one having a weight average molecular weight of 50,000 to 2,000,000 may be used, more preferably 80,000 to 200,000.

The second coating solution is coated on the upper surface of the first nail polish layer, and the second nail polish layer formed by the coating may be heat treated for 2 to 3 minutes based on a temperature of 40 to 50°C. The second manicure layer is completed by this heat treatment step.

The manicure sticker manufactured by the manufacturing method of the present invention may be illustrated in the form shown in FIG. 1. As shown in FIG. 1, the first manicure layer 21 and the second manicure layer 23 are combined to form the manicure layer 20. When the user applies the nail polish layer to the nails, after separating the nail polish layer 20 from the release sheet 10, the nail polish layer can be fixed to the nail by placing it on the nail and pressing it with an appropriate pressure. The manicure layer may have various patterns and/or colors.

The manufacturing method of the present invention may further include forming a protective layer on the top surface of the nail polish layer, specifically on the top surface of the second nail polish layer. The protective layer is usually formed of a transparent coating liquid, and the protective layer in the present invention may be employed without limitation any configuration known in the art.

As the transparent coating solution, at least one selected from the group consisting of UV resin, urethane resin, acrylic resin, cellulose resin, polyester resin, vinyl resin, polyamide resin, epoxy resin, alkyd resin, and latex casein may be used. .

The manicure sticker on which the protective layer 30 is formed may be illustrated in the form of FIG. 2.

The manufacturing method of the present invention may further include forming a three-dimensional decorative layer or decorative pattern layer on an upper surface of the second manicure layer or on an upper surface of the protective layer.

The shape of the manicure sticker on which the three-dimensional decorative layer 40 is formed is illustrated in FIGS. 3 and 4. The three-dimensional decoration layer may be formed by a process of fixing a three-dimensional decoration such as jewelry by an adhesive.

The decorative pattern may be made of various patterns of the same or different color as the manicure layer, or may be made of a three-dimensional pattern. The pattern may have a regular shape or may have an arbitrary irregular pattern. The decorative pattern may be formed using a known method such as printing.

The manufacturing method of the present invention may further include a protective layer forming step of forming a protective layer on the three-dimensional decorative layer or the decorative pattern layer (see FIG. 4). The protective layer improves the gloss effect of the nail polish layer and protects the nail polish layer or decorative pattern from external impacts.

The protective layer is usually formed of a transparent coating liquid, and the protective layer in the present invention may be employed without limitation any configuration known in the art.

As the transparent coating solution, at least one selected from the group consisting of UV resin, urethane resin, acrylic resin, cellulose resin, polyester resin, vinyl resin, polyamide resin, epoxy resin, alkyd resin, and latex casein may be used. .

The manicure sticker of the present invention may be cut to have an appropriate size and shape in consideration of the size of a nail to be attached.

The nail polish sticker of the present invention can be easily removed by immersing it in lukewarm water at 50 to 60° C. for a certain period of time while attached to a fingernail.

Hereinafter, the present invention will be described in more detail through examples. However, the following examples are for explaining the present invention more specifically, and the scope of the present invention is not limited by the following examples. The following examples can be appropriately modified and changed by those skilled in the art within the scope of the present invention.

Preparation Example 1: Synthesis of Copolymer of Formula 1

(1) Synthesis of glycidyldimethyldodecylammonium chloride of formula 4

In a 250 ml flask, 41.86 g of dimethyldodecylamine of the following formula (2) and 21.78 g of epichlorohydrin of the formula (3) were added. 28.98 g of isopropyl alcohol and 7.38 g of distilled water were used as solvents. Then, the reaction was carried out by stirring at 25 °C for 5 hours. In this reaction, when the temperature of the reactant increases due to the heat of reaction of the exothermic reaction, the epoxy group is destroyed, so the reaction was carried out in a water bath at 25°C. As a result of the reaction, glycidyldimethyldodecylammonium chloride of Formula 4 was obtained. The reaction yield was 85% by measuring the amine value and 79% of the epoxy value remained.

[Formula 2]

[Formula 3]

[Formula 4]

Glycidyldimethyltetradecylammonium chloride, glycidyldimethylhexadecylammonium chloride, and glycidyldimethyloctadecylammonium chloride are synthesized in the same manner as the above synthesis method.

(2) Synthesis of glycidyldimethyldodecylammonium chloride acrylate monomer

The cationic surfactant compound of Formula 4 and acrylic acid prepared in (1) are dissolved in an isopropyl alcohol solvent in a molar ratio of 1:1, and maintained in an oven at 45°C for 24 hours to proceed with the reaction. After the reaction was completed, the compound was transferred to a glass filter and washed with 2 L of isopropyl alcohol to remove unreacted material. After washing, it was dried in a vacuum oven at 45°C for 8 hours to synthesize an acrylic monomer substituted with a cationic surfactant compound.

(3) Synthesis of the copolymer of formula 1

The glycidyldimethyldodecylammonium chloride acrylate monomer and 2-octylcyanoacrylate prepared in (2) were added in a molar ratio of 0.3:0.7, and 0.5 parts by weight of normal mercaptan was mixed with 100 parts by weight of the total monomer. Made uniform. A small amount of disodium hydrogen phosphate was dissolved and stirred in 30 parts by weight of ion-exchanged water in a stainless steel high-pressure reactor equipped with a stirrer, and the inside of the reactor was filled with an inert gas such as nitrogen and heated. The reaction was terminated by polymerization for 3 hours at 80°C and 3 hours at 20°C. After the reaction was terminated, washing, dehydration, and drying were performed to obtain a polymer compound of Formula 1 having a weight average molecular weight of 110,000.

[Formula 1]

In the above formula

a and b are the molar ratios, a is 0.3, b is 0.7, and a+b=1.

Manufacturing Example 2 : Synthesis of polymer compound of formula 2

Poly(2-dimethylamino)ethyl methacrylate methyl chloride quaternary salt monomer (manufactured by Sigma Aldrich) and dopamine methacrylamide in a 1:1 molar ratio And 0.5 parts by weight of normal mercaptan was mixed with 100 parts by weight of the total monomer to make it uniform. A small amount of disodium hydrogen phosphate was dissolved and stirred in 30 parts by weight of ion-exchanged water in a stainless steel high-pressure reactor equipped with a stirrer, and the inside of the reactor was filled with an inert gas such as nitrogen and heated. The reaction was terminated by polymerization for 2 hours at 65°C and 1.5 hours at 100°C. After the reaction was completed, washing, dehydration, and drying were performed to obtain a polymer compound of Formula 1 having a weight average molecular weight of 90,000.

[Formula 2]

In the above formula,

a and b are the molar ratios, a is 0.5 and b is 0.5, and a+b=1.

Preparation Example 3: Preparation of acrylic polymer

Ethyl methacrylate 100g, 2-hydroxyethyl methacrylate 20g, poly(2-dimethylamino)ethyl methacrylate methyl chloride quaternary salt in a 1000 cc reactor equipped with a cooling device to allow nitrogen gas to be refluxed and temperature controlled (Poly(2-dimethylamino)ethyl methacrylate) methyl chloride quaternary salt) 5 g of a monomer (manufactured by Sigma Aldrich) and 5 g of dopamine methacrylamide were added, and 10 ml of ethyl acetate as a solvent was added thereto. Then, nitrogen gas was purged for 20 minutes, maintained at 70° C., and uniformly removed to remove oxygen. Here, 0.03 parts by weight of benzoyl peroxide and 0.02 parts by weight of zinc peroxide, which are reaction initiators, were diluted in ethyl acetate at a concentration of 50%, added thereto, and reacted for 10 hours. Finally, an acrylic copolymer was obtained, and the molecular weight was measured using a polystyrene standard sample, which was 250,000.

Comparative Preparation Example 1: Preparation of acrylic polymer

Ethyl methacrylate 100g and 2-hydroxyethyl methacrylate 30g were added to a 1000 cc reactor equipped with a cooling device so that nitrogen gas was refluxed and temperature control was easy, and 10 ml of ethyl acetate as a solvent was added thereto. . Then, nitrogen gas was purged for 20 minutes, maintained at 70° C., and uniformly removed to remove oxygen. Here, 0.03 parts by weight of benzoyl peroxide, which is a reaction initiator, was diluted in ethyl acetate at a concentration of 50%, added thereto, and reacted for 10 hours. Finally, an acrylic copolymer was obtained, and the molecular weight was measured using a polystyrene standard sample, which was 230,000.

Example 1: Preparation of nail polish sticker

59.5% by weight of the acrylic copolymer prepared in Preparation Example 3, 30% by weight of a nitrocellulose resin, 0.3% by weight of a tolyene diisocyanate adduct (TDI-1) of isocyanate-based trimethylolpropane as a multifunctional crosslinking agent, 3 as a silane-based crosslinking agent -Glycidoxypropyltrimethoxysilane 0.2% by weight and 10% by weight of ethyl acetate solution were mixed and stirred for 3 hours to prepare a first coating solution.

Thereafter, the first coating solution was knife-coated on a release paper (100×100 mm) and then heat-treated at 40 to 50° C. for 1.5 to 2.5 minutes to form a first nail polish layer.

A thermoplastic resin gel was prepared by mixing 100 g of polyurethane as a thermoplastic resin and 5 g of dipropylen glycoldibenzoate (DP) as a plasticizer.

Next, by mixing 50% by weight of nitrocellulose, 5% by weight of the copolymer represented by Formula 1 prepared in Preparation Example 1, 25% by weight of the thermoplastic resin gel prepared above, and 20% by weight of ethyl acetate as a solvent, A coating solution was prepared.

The second coating solution was coated on the first nail polish layer and heat-treated for 2 to 3 minutes based on a temperature of 40 to 50°C to form a second nail polish layer.

[Formula 1]

In the above formula

a and b are the molar ratios, a is 0.3, b is 0.7, and a+b=1.

Example 2: Preparation of nail polish sticker

54.5% by weight of the acrylic copolymer prepared in Preparation Example 3, 30% by weight of the nitrocellulose resin, 5% by weight of the copolymer represented by Formula 2 prepared in Preparation Example 2, Tolyl of isocyanate-based trimethylolpropane as a multifunctional crosslinking agent The first coating solution was mixed with 0.3% by weight of the adduct of rendiisocyanate (TDI-1), 0.2% by weight of 3-glycidoxypropyltrimethoxy silane, and 10% by weight of ethyl acetate solution as a silane crosslinking agent, and stirred for 3 hours. Was prepared.

Thereafter, the first coating solution was knife-coated on a release paper (100×100 mm) and then heat-treated at 40 to 50° C. for 1.5 to 2.5 minutes to form a first nail polish layer.

A thermoplastic resin gel was prepared by mixing 100 g of polyurethane as a thermoplastic resin and 5 g of dipropylen glycoldibenzoate (DP) as a plasticizer.

Next, by mixing 50% by weight of nitrocellulose, 5% by weight of the copolymer represented by Formula 1 prepared in Preparation Example 1, 25% by weight of the thermoplastic resin gel prepared above, and 20% by weight of ethyl acetate as a solvent, A coating solution was prepared.

The second coating solution was coated on the first nail polish layer and heat-treated for 2 to 3 minutes based on a temperature of 40 to 50°C to form a second nail polish layer.

[Formula 2]

In the above formula,

a and b are the molar ratios, a is 0.5 and b is 0.5, and a+b=1.

Comparative Example 1: Preparation of nail polish sticker

59.5% by weight of the acrylic copolymer prepared in Comparative Preparation Example 1, 30% by weight of a nitrocellulose resin, 0.3% by weight of a tolyene diisocyanate adduct (TDI-1) of isocyanate-based trimethylolpropane as a multifunctional crosslinking agent, and a silane-based crosslinking agent A first coating solution was prepared by mixing 0.2% by weight of 3-glycidoxypropyltrimethoxysilane and 10% by weight of ethyl acetate solution and stirring for 3 hours.

Thereafter, the first coating solution was knife-coated on a release paper (100×100 mm) and then heat-treated at 40 to 50° C. for 1.5 to 2.5 minutes to form a first nail polish layer.

A thermoplastic resin gel was prepared by mixing 100 g of polyurethane as a thermoplastic resin and 5 g of dipropylen glycoldibenzoate (DP) as a plasticizer.

A second coating solution was prepared by mixing 55% by weight of nitrocellulose, 25% by weight of the thermoplastic resin gel prepared above, and 20% by weight of ethyl acetate as a solvent.

The second coating solution was coated on the first nail polish layer and heat-treated for 2 to 3 minutes based on a temperature of 40 to 50°C to form a second nail polish layer.

Test Example 1: Evaluation of physical properties of nail polish stickers

Moisture and heat resistance, heat resistance, adhesion, and separation time of the nail polish sticker specimens prepared according to Examples 1 and 2 and Comparative Example 1 were measured, and the results are shown in Table 1 below.

The moist heat resistance was evaluated by observing whether bubbles or peeling occurred after maintaining the specimen at 60°C and 90% relative humidity for 72 hours.The heat resistance was evaluated by maintaining the specimen at 80°C for 72 hours. Peeling was evaluated by observing whether or not peeling occurred. The adhesion was measured by bonding the specimen to the fixed glass substrate, and the adhesion of the specimen was measured using a universal testing machine. The time to separate the nail polish sticker by soaking was measured and evaluated.

* Evaluation standard

○: No bubbles or peeling phenomenon

△: There are some bubbles or peeling phenomenon

×: There are bubbles or peeling phenomenon

Moisture and heat resistance Heat resistance properties Adhesion (gf/cm ² ) Separation time by 60℃ water Comparative Example 1 △ △ 1070 6 minutes Example 1 ○ ○ 1370 5 minutes Example 2 ○ ○ 1500 5 minutes

As can be seen in Table 1, it was confirmed that the nail polish stickers of Examples 1 and 2 of the present invention have excellent moist heat resistance and heat resistance compared to the manicure stickers of Comparative Example 1, and particularly, have remarkably excellent adhesion.

Furthermore, in the case of the nail polish stickers of Examples 1 and 2, the separation time was the same, but it was confirmed that the adhesion of the nail polish stickers of Example 2 including the copolymer of Formula 2 in the first coating solution was better.

Example 3: Preparation of three-dimensional nail polish sticker

A three-dimensional nail polish sticker was prepared by attaching 10 cubic crystals to the surface of the nail polish sticker prepared in Example 2 using an instant adhesive.

Comparative Example 2: Preparation of three-dimensional nail polish sticker

In the same manner as in Example 3, 10 cubic crystals were attached to the surface of the nail polish sticker prepared in Comparative Example 1 using an instant adhesive to prepare a three-dimensional nail polish sticker.

Test Example 2: Durability evaluation of the three-dimensional decorative layer

The three-dimensional manicure stickers prepared in Example 3 and Comparative Example 2 were pushed in the transverse direction with the same force to count the number of cubic crystals that were removed, and are shown in Table 2 below.

Number of Cubic Crystals Dropped Comparative Example 2 3 Example 3 0

As can be seen in Table 2, the three-dimensional nail polish sticker of Example 3 of the present invention contains the copolymer of Formula 1 in the second nail polish layer, so that the surface hardness and durability of the second nail polish layer are strong, so that it is not cracked or broken. As it did not occur, it was confirmed that the cubic crystal did not drop out. On the other hand, it was confirmed that the three-dimensional nail polish sticker of Comparative Example 2 did not have strong surface hardness and durability of the second nail polish layer, so that three cubic crystals were eliminated as the second nail polish layer ruptured.

10: release sheet, 20: nail polish layer,
21: first manicure layer, 23: second manicure layer,
30: protective layer, 40: three-dimensional decorative layer or decorative pattern layer

Claims (6)

a) 5 to 30 parts by weight of hydroxyalkyl (meth)acrylate monomer, 2 to 7 parts by weight of poly(2-dimethylamino)ethylmethacrylate methylchloride quaternary salt monomer, based on 100 parts by weight of alkylmethacrylate monomer, And 30 to 50% by weight of a mixture comprising an acrylic polymer in which 2 to 7 parts by weight of a dopamine methacrylamide monomer is polymerized and 5 to 15 parts by weight of a solvent; And nitrocellulose 50 to 70% by weight; preparing a first coating solution containing;
b) forming a first nail polish layer by coating the first coating solution on a release sheet;
c) heat-treating the first nail polish layer in step b);
d) To prepare a second coating solution comprising 35 to 55% by weight of nitrocellulose, 2 to 10% by weight of a copolymer represented by the following formula (1), 15 to 25% by weight of a thermoplastic resin gel, and 10 to 30% by weight of a solvent step;
e) coating the second coating solution on the top surface of the heat-treated first nail polish layer in step c) to form a second nail polish layer; And
f) heat-treating the second nail polish layer of step e);
Manufacturing method of a nail polish sticker comprising:
[Formula 1]

In the above formula
a and b are mole fractions, a is 0.3 to 0.7, b is 0.3 to 0.7, and a+b=1. The method of claim 1,
The first coating solution is a method of manufacturing a manicure sticker, characterized in that it further comprises 2 to 10% by weight of a copolymer represented by the following formula:
[Formula 2]

In the above formula
a and b are mole fractions, a is 0.3 to 0.7, b is 0.3 to 0.7, and a+b=1. The method of claim 1,
After the step f), the method of manufacturing a nail polish sticker, further forming a protective layer on the second nail polish layer. The method of claim 1,
After the step f), the method of manufacturing a nail polish sticker, further comprising forming a three-dimensional decorative layer or a decorative pattern layer on the second nail polish layer. The method of claim 4,
After the step of forming the three-dimensional decorative layer or decorative pattern layer, a method of manufacturing a manicure sticker, further forming a protective layer on the three-dimensional decorative layer or the decorative pattern layer. The method of claim 1,
The heat treatment in step c) is carried out at a temperature of 40 to 50°C,
The heat treatment in step f) is a method of manufacturing a nail polish sticker, characterized in that it is carried out at a temperature of 40 ~ 50 ℃.

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